JP6455840B2 - Squeeze pin operation determination device and squeeze pin operation determination method - Google Patents

Description

  The present invention relates to a squeeze pin operation determination device and a squeeze pin operation determination method.

Patent Document 1 discloses a conventional apparatus for producing an aluminum die-cast product. This manufacturing apparatus manufactures a pressure cast product by performing a pressurizing operation for locally pressurizing the molten metal filled in the cavity of the mold with a squeeze pin. That is, the molten metal filled in the cavity is likely to cause casting defects such as nests by contracting in the process of solidifying. The squeeze pin locally pressurizes such a part and suppresses the occurrence of casting defects. At this time, squeeze pin, follow the movement of the solidification interface which is obtained by the solidification interface moving rate of the melt which is previously calculated, is controlled to continue and pushing to the freezing completion.

JP 2008-55473 A

  By the way, in the above conventional aluminum die casting product manufacturing apparatus, in order to obtain stable quality during mass production of pressure cast products, the squeeze pin reaches the full stroke depth or the vicinity where the squeeze pin enters most into the cavity from the initial position. If all the pressure cast products are determined to be defective, there is a problem that it is difficult to improve the yield.

  In addition, Patent Document 1 does not specify the non-defective product determination of the pressure cast product manufactured by the conventional aluminum die cast product manufacturing apparatus. In paragraphs 0010 and 0031 of Patent Document 1, it is disclosed that it is difficult to obtain a stable quality during mass production under conditions where the squeeze pin reaches the full stroke depth in the pressurizing operation, and it is desirable to avoid it. ing.

  The present invention has been made in view of the above-described conventional situation, and should provide a squeeze pin operation determination device and a squeeze pin operation determination method capable of improving the yield of a pressure cast product. It is an issue.

The squeeze pin operation determination device of the present invention is used in a die casting machine that manufactures a pressure cast product by performing a pressure operation to locally pressurize a molten metal filled in a mold cavity with a squeeze pin. A squeeze pin operation determination device for determining the operation of a pin,
A first depth that is not more than a full stroke depth at which the squeeze pin enters most into the cavity from an initial position, a second depth that is smaller than the first depth, and the squeeze pin reaches the first depth. Or setting means for setting a reference time when passing through the first depth;
In the pressurizing operation, an arrival depth measuring means for measuring an arrival depth at which the squeeze pin is displaced from the initial position and stops due to solidification of the molten metal,
In the case where the first depth is set equal to the full stroke depth, if the reaching depth is less than the first depth and greater than or equal to the second depth, the pressure cast product is a non-defective product When the first depth is set to be smaller than the full stroke depth and the reaching depth is not more than the first depth and not less than the second depth, the pressure cast product First judging means for judging that the product is non-defective,
When the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth, it is necessary for the squeeze pin to reach the first depth from the initial position. A time measuring means for measuring the time required, and measuring the time required if the reaching depth is larger than the first depth when the first depth is set smaller than the full stroke depth; ,
If the required time is equal to or longer than the reference time, the second determining means for determining that the pressure cast product is a non-defective product ,
The reference time is set longer than an idle driving time for the squeeze pin to reach the full stroke depth from the initial position when the molten metal is not present in the cavity .

  In the squeeze pin operation determining device of the present invention, the required time measuring means is configured such that when the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth, the squeeze pin is moved from the initial position to the first position. The time required to reach one depth is measured, and if the first depth is set smaller than the full stroke depth and the reaching depth is greater than the first depth, the time required is measured. Then, the second determination means determines that the press-cast product is a non-defective product if the required time is equal to or longer than the reference time.

  In other words, the second determination means reliably propagates the entire squeeze pin to the entire melt just before solidification of the squeeze pin as the squeeze pin reaches the full stroke depth or its vicinity as the solidification of the melt progresses. The non-defective product can be selected from the pressure cast products when the squeeze pin reaches the full stroke depth or the vicinity thereof based on the condition that can be assumed to be.

  Therefore, in the squeeze pin operation determination device of the present invention, the yield of the pressure cast product can be improved.

  In the squeeze pin operation determination device of the present invention, the die casting machine preferably includes a timing timer that controls a waiting time until the squeeze pin starts to be displaced from the initial position in the pressurizing operation. The squeeze pin operation determination device increases the waiting time when the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth and the required time is shorter than the reference time. When the first depth is set to be smaller than the full stroke depth, the arrival depth is greater than the first depth and the required time is the reference time. The delay unit transmits a delay signal to the timing timer, and if the arrival depth is smaller than the second depth, the adjusting unit further transmits a shortening signal for shortening the waiting time to the timing timer. It is desirable to have it. In this case, the timing for starting the pressurizing operation can be suitably adjusted by the adjusting means in accordance with the actual operating state of the squeeze pin, so that the yield of the press cast product can be further improved.

Reference time, that have a squeeze pin in the state molten metal is not in the cavity is longer than the idle driving time to reach the full stroke depth from the initial position. In this case, the reference time can be suitably set, and the non-defective product determination can be performed more accurately.

  The first depth is desirably set to be 90% or more of the full stroke depth. In this case, the yield of the pressure cast product can be further improved by the first depth being close to the condition of the pressure operation that can effectively suppress the occurrence of casting defects.

  The squeeze pin operation determination device of the present invention displays a graph of time series data when the squeeze pin is displaced from the initial position to the reaching depth in the pressurizing operation, and superimposes the reference time and the required time on the time series data. It is desirable to further include a display unit for displaying. In this case, the operator of the die casting machine can easily recognize the non-defective product determination status. Further, by displaying the latest time-series data superimposed on the past time-series data, the operator can easily recognize the tendency of non-defective product determination.

The squeeze pin operation determining method of the present invention is carried out in a die casting process for producing a pressure cast product by performing a pressurizing operation for locally pressurizing a molten metal filled in a cavity of a mold with a squeeze pin. A squeeze pin operation determination method for determining pin operation,
A first depth that is not more than a full stroke depth at which the squeeze pin enters most into the cavity from an initial position, a second depth that is smaller than the first depth, and the squeeze pin reaches the first depth. Or a setting step for setting a reference time when passing through the first depth;
In the pressurizing operation, an arrival depth measurement step of measuring an arrival depth at which the squeeze pin is displaced from the initial position and stops due to solidification of the molten metal;
In the case where the first depth is set equal to the full stroke depth, if the reaching depth is less than the first depth and greater than or equal to the second depth, the pressure cast product is a non-defective product When the first depth is set to be smaller than the full stroke depth and the reaching depth is not more than the first depth and not less than the second depth, the pressure cast product A first determination step of determining that the product is non-defective,
When the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth, it is necessary for the squeeze pin to reach the first depth from the initial position. A required time measuring step for measuring the required time if the first depth is set smaller than the full stroke depth and the reach depth is larger than the first depth when measuring the time. ,
If the required time is equal to or longer than the reference time, a second determination step of determining that the pressure cast product is a non-defective product ,
The reference time is set longer than an idle driving time for the squeeze pin to reach the full stroke depth from the initial position when the molten metal is not present in the cavity .

  In the squeeze pin operation determination method of the present invention, when the required time measurement step is executed, if the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth, the squeeze pin is The time required to reach the first depth from the initial position is measured, and if the first depth is set smaller than the full stroke depth and the reach depth is larger than the first depth, the time required Measure. And when a 2nd judgment step is performed, if a required time is more than reference time, it will judge that a pressure casting is a non-defective product.

  That is, according to the second judgment step, as the squeeze pin reaches the full stroke depth or its vicinity as the solidification of the melt progresses, the squeeze pin is surely applied to the entire melt just before the local pressure of the squeeze pin solidifies. On the basis of conditions that can be estimated to propagate to the squeeze pin, it is possible to select a non-defective product from the pressure cast products when the squeeze pin reaches the full stroke depth or the vicinity thereof.

  Therefore, in the squeeze pin operation determination method of the present invention, the yield of the pressure cast product can be improved.

  In the squeeze pin operation determination device and the squeeze pin operation determination method of the present invention, the yield of the pressure casting product can be improved.

FIG. 1 is a schematic cross-sectional view of a die casting machine in which the squeeze pin operation determination device of the embodiment is used. FIG. 2 is a schematic configuration diagram of the squeeze pin operation determination device of the embodiment. FIG. 3 is a partial schematic cross-sectional view of the die casting machine showing a state in which the molten metal is filled into the cavity by the injection plunger. FIG. 4 is a partial schematic cross-sectional view of the die casting machine showing a state where a pressurizing operation using a squeeze pin is performed. FIG. 5 is a partial schematic cross-sectional view of the die casting machine showing a state where the mold is opened. FIG. 6 is a partial schematic cross-sectional view of a die casting machine showing a state in which a pressure cast product is removed. FIG. 7 is a flowchart of non-defective / defective product determination performed by the squeeze pin operation determination device. FIG. 8 is a flowchart of non-defective / defective product determination performed by the squeeze pin operation determination device. FIG. 9 is a graph for explaining the relationship between the time-series data of the squeeze pin displacement and the non-defective / defective product determination. FIG. 10 is a graph for explaining the relationship between the time-series data of the squeeze pin displacement and the non-defective / defective product determination.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

(Example)
As shown in FIG.1 and FIG.2, the squeeze pin operation | movement determination apparatus 1 of an Example is used for the die-casting machine 10 which manufactures a pressure casting product. The squeeze pin operation determination device 1 is an example of a specific aspect of the “squeeze pin operation determination device” of the present invention. The method for determining the pressure operation of the squeeze pin 4 performed by the squeeze pin operation determination device 1 in the manufacturing process of the pressure cast product by the die casting machine 10 is a specific example of the “squeeze pin operation determination method” of the present invention. It is an example of a specific aspect. In the present embodiment, the pressure casting product manufactured by the die casting machine 10 is an aluminum die casting product such as a housing or a rotor constituting a compressor. In addition, this invention is applicable also to the pressure casting products which comprise machines other than a compressor, and the pressure casting products which use metals other than aluminum as a raw material.

  As shown in FIG. 1, the die casting machine 10 includes a mold 11, a hydraulic cylinder 5, a squeeze pin 4, a flow sensor 6, and a die casting machine control unit 10 </ b> C.

  As shown in FIGS. 1 and 3 to 6, the mold 11 includes a fixed mold 12 and a movable mold 13. The fixed mold 12 and the movable mold 13 are held by a mold clamping device (not shown). The movable mold 13 is brought into contact with and separated from the fixed mold 12 by operating a mold clamping device (not shown). As shown in FIGS. 1, 3, and 4, in a state where the fixed mold 12 and the movable mold 13 are clamped by a mold clamping device (not shown), the fixed mold 12 and the movable mold 13 are disposed between the fixed mold 12 and the movable mold 13. A cavity 11A is formed.

  As shown in FIGS. 1 and 3 to 6, the fixed mold 12 is provided with a plunger sleeve 15 and an injection plunger 16. The plunger sleeve 15 has a cylindrical shape and is connected to the fixed mold 12. The internal space of the plunger sleeve 15 communicates with the cavity 11A. The injection plunger 16 is accommodated in the plunger sleeve 15 so as to be able to advance and retract.

  The movable die 13 is provided with an extrusion pin 13A that can be advanced and retracted. As shown in FIG. 6, the push pin 13A can protrude into the cavity 11A.

As shown in FIGS. 1 and 3 to 6, the hydraulic cylinder 5 is provided in the fixed mold 12. The hydraulic cylinder 5 has a cylinder chamber 5A and a piston 5B. One end of a hydraulic pipe 5C is connected to the opposite side of the cylinder chamber 5A from the cavity 11A. The cavity 11A side in the cylinder chamber 5A, one end of the hydraulic pipe 5D is connected. As shown in FIG. 1, the other end of the hydraulic pipe 5C and the other end of the hydraulic pipe 5D are connected to the hydraulic control circuit 10D. The hydraulic control circuit 10D includes a flow path switching valve, a hydraulic pump, a hydraulic oil tank, and the like (not shown). The piston 5B is accommodated in the cylinder chamber 5A so as to advance and retreat. The cylinder chamber 5A is divided into two parts by the front surface of the piston 5B on the cavity 11A side and the back surface of the piston 5B on the side opposite to the cavity 11A.

  The squeeze pin 4 is a substantially cylindrical shaft body formed integrally with the piston 5B. The squeeze pin 4 protrudes from the front surface of the piston 5B toward the cavity 11A.

  As shown in FIG. 4, hydraulic oil is supplied to the space defined by the back surface of the piston 5B and the cylinder chamber 5A via the hydraulic pipe 5C, while the space is defined by the front surface of the piston 5B and the cylinder chamber 5A. The squeeze pin 4 protrudes into the cavity 11A by discharging the hydraulic oil from the space through the hydraulic pipe 5D.

  As shown in FIG. 6, hydraulic oil is supplied to the space defined by the front surface of the piston 5B and the cylinder chamber 5A via the hydraulic pipe 5D, while defined by the back surface of the piston 5B and the cylinder chamber 5A. The squeeze pin 4 moves backward by discharging hydraulic oil from the space through the hydraulic pipe 5C.

  1, 3 and 6 show a state in which the squeeze pin 4 is retracted most. The position of the squeeze pin 4 shown in FIGS. 1, 3, and 6 is set as the initial position.

4 and 5 show a state in which the squeeze pin 4 has entered most into the cavity 11A from the initial position. The position of the squeeze pin 4 shown in FIGS. 4 and 5 is a full stroke position. Here, the depth at which the squeeze pin 4 enters most into the cavity 11A from the initial position is defined as “full stroke depth Lf”. In the present embodiment, the full stroke depth Lf is 15.0 mm. The full stroke depth Lf = 15.0 mm is an embodiment of the present invention, and is not limited to this value. For example, the full stroke depth Lf = 20. There can be 0 mm.

  As shown in FIG. 1, the flow sensor 6 is provided in the middle of the hydraulic pipe 5D. The flow sensor 6 outputs a pulse signal corresponding to the flow rate of the hydraulic oil flowing through the hydraulic pipe 5D. The pulse interval of the pulse signal becomes longer or shorter depending on the flow rate of the hydraulic oil. The pulse signal of the flow sensor 6 is transmitted to the squeeze pin operation determination device 1.

  The die casting machine control unit 10C detects whether or not the squeeze pin 4 is at the initial position and whether or not the squeeze pin 4 is at the full stroke position by a position detection sensor (not shown). The die casting machine controller 10C determines whether or not the squeeze pin 4 is in the initial position based on the pulse output of the flow sensor 6 and the position of the flow path switching valve of the hydraulic control circuit 10D. It is also possible to indirectly detect whether or not is at the full stroke position.

  As shown in FIGS. 1 and 3 to 6, the die casting machine control unit 10C controls a mold clamping device, an injection plunger 16, a hydraulic control circuit 10D, an extrusion pin 13A, and the like (not shown) to control the pressure casting product A2. Manufacture.

  Specifically, as shown in FIG. 1, the die casting machine control unit 10 </ b> C uses a mold clamping device (not shown) to clamp the fixed mold 12 and the movable mold 13 with a predetermined mold clamping force. The molten metal A1 is supplied into the plunger sleeve 15 by 15A.

  Next, as shown in FIG. 3, the die casting machine control unit 10 </ b> C injects the molten metal A <b> 1 into the cavity 11 </ b> A by moving the injection plunger 16 forward in the plunger sleeve 15 toward the cavity 11 </ b> A. FIG. 3 shows a state in which the injection plunger 16 has completed the injection of the molten metal A1 and the molten metal A1 is filled in the cavity 11A. The position of the injection plunger 16 shown in FIG.

  Next, as shown in FIG. 4, the die casting machine control unit 10C operates the hydraulic cylinder 5 by the hydraulic control circuit 10D, and pressurizes the molten metal A1 filled in the cavity 11A locally by the squeeze pin 4. Perform the action.

  Here, as shown in FIG. 2, the die casting machine control unit 10C has a timing timer 10T. The timing timer 10T controls the waiting time Tw until the squeeze pin 4 starts to be displaced from the initial position in the pressurizing operation. The waiting time Tw is appropriately adjusted by a shortening signal or a delay signal transmitted from the squeeze pin operation determination device 1 as described later.

  When detecting that the injection plunger 16 has reached the injection completion position shown in FIG. 3 by a position detection sensor (not shown), the die casting machine control unit 10C starts timing of the timing timer 10T. When the timing timer 10T reaches the waiting time Tw, the die casting machine control unit 10C displaces the squeeze pin 4 from the initial position shown in FIG. 3 and enters the cavity 11A. At this time, as shown in FIG. 2, a squeeze start signal is transmitted from the die casting machine control unit 10 </ b> C to the squeeze pin operation determination device 1. As shown in FIG. 4, the squeeze pin 4 entering the cavity 11A locally pressurizes the molten metal A that shrinks in the process of solidification, and suppresses the occurrence of casting defects such as nests. And the squeeze pin 4 stops by solidification of the molten metal A1. Here, the depth at which the squeeze pin 4 is displaced from the initial position and stops due to the solidification of the molten metal A1 is referred to as an “arrival depth La”.

  Data indicating how the squeeze pin 4 actually operates, that is, time-series data of the displacement of the squeeze pin 4 is monitored by the squeeze pin operation determination device 1 as described later. Curves P <b> 1 to P <b> 8 shown in FIGS. 9 and 10 are examples of time-series data of displacement of the squeeze pin 4. As can be seen by comparing the time series data P1 to P8, the time series data of the displacement of the squeeze pin 4 is produced in various ways such as variations in the temperature of the mold 11 and the molten metal A1 and the length of the waiting time Tw of the timing timer 10T. Changes due to variations in conditions.

  Next, as shown in FIG. 5, the die casting machine control unit 10 </ b> C separates the movable mold 13 from the fixed mold 12 by a mold clamping device (not shown).

  Next, as shown in FIG. 6, the die casting machine control unit 10C causes the extrusion pin 13A to protrude into the cavity 11A, and the pressure casting product A2 is removed from the cavity 11A. Further, the die casting machine control unit 10C operates the hydraulic cylinder 5 by the hydraulic control circuit 10D to return the squeeze pin 4 to the initial position.

  As shown in FIG. 1, a product take-out machine 20 is installed in the vicinity of the mold 11. The product take-out machine 20 operates in conjunction with the die casting machine 10. As shown in FIG. 6, in the die casting machine 10, when the movable mold 13 is separated from the fixed mold 12, and the pressure casting product A2 is removed from the cavity 11A by the extrusion pin 13A, the product take-out machine 20 is The pressure casting product A2 is taken out. Then, the product take-out machine 20 sorts and transfers the taken-out pressure cast product A2 to a good product storage location or a defective product storage location based on the non-defective product / defective product determination result of the squeeze pin operation determination device 1 described below. To do.

  As shown in FIGS. 1 and 2, the squeeze pin operation determination device 1 is a separate device from the die casting machine control unit 10C, and is configured to transmit and receive various signals to and from the die casting machine control unit 10C. ing. Note that the squeeze pin operation determination device 1 can be configured as a part of the die casting machine control unit 10.

  As shown in FIGS. 2 and 7 to 10, the squeeze pin operation determination device 1 determines a non-defective product / defective product of the pressure cast product A <b> 2 by determining a press operation of the squeeze pin 4, and a product take-out machine Let 20 select a good product and a defective product. Further, the squeeze pin operation determination device 1 adjusts the waiting time Tw of the timing timer 10T of the die casting machine control unit 10C.

  The squeeze pin operation determination device 1 includes an arithmetic processing device such as a CPU and a storage device such as a ROM, a RAM, and an HDD. As shown in FIG. A plurality of processes such as the second processing unit 52, the third processing unit 53, and the fourth processing unit 54 can be performed.

  Further, the squeeze pin operation determination device 1 includes a display unit 9. The display unit 9 is a user interface having a display screen such as an LCD. The display unit 9 appropriately displays data or the like that is processed or stored by the first to fourth processing units 51 to 54. Further, the display unit 9 displays time series data of displacement of the squeeze pin 4, specifically, time series data P1 to P8 shown in FIGS. 9 and 10, and a reference time Tg and a required time Ta1 described later. Depending on the operation, the graph is displayed alone or in a superimposed manner.

  The non-defective / defective product determination of the pressure cast product A2 performed by the squeeze pin operation determination device 1 will be described below. The squeeze pin operation determination apparatus 1 repeatedly executes the “good / defective product determination” program shown in FIGS. 7 and 8 for each shot in cooperation with the manufacturing process of the pressure cast product A2 by the die casting machine 10.

  First, in step S101 shown in FIG. 7, the first depth L1, the second depth L2, and the reference time Tg are set.

  The first depth L1 is a depth that is the upper limit of the target range of the reach depth La of the squeeze pin 4. The first depth L1 is set to be equal to or less than the full stroke depth Lf. The second depth L2 is a depth that is the lower limit of the target range of the reaching depth La of the squeeze pin 4. The second depth L2 is set smaller than the first depth L1.

  In the example of FIG. 9, the first depth L1 is set to 14.5 mm, which is smaller than the full stroke depth Lf (15.0 mm). The second depth L2 is set to 10.0 mm, which is smaller than the first depth L1. On the other hand, in the example of FIG. 10, the first depth L1 is set to 15.0 mm which is equal to the full stroke depth Lf. The second depth L2 is set to 10.0 mm, which is smaller than the first depth L1.

  That is, in the present embodiment, the first depth L1 is set to be 90% or more of the full stroke depth Lf.

  Such setting of the first depth L1 and the second depth L2 is performed by the third processing unit 53 shown in FIG. The third processing unit 53 holds the full stroke depth Lf and the set first depth L1 and second depth L2.

  The reference time Tg is a reference for making a determination based on the required time Ta1 described later when the squeeze pin 4 reaches the first depth L1 or passes through the first depth L1. The time series data P1 and P2 shown in FIG. 9 is a case where the squeeze pin 4 passes through the first depth L1. The time series data P5 and P6 shown in FIG. 10 is a case where the squeeze pin 4 reaches the first depth L1.

  The reference time Tg is set as follows. As shown in FIG. 9 and FIG. 10, the time for the squeeze pin 4 to reach the full stroke depth Lf from the initial position in a state where there is no molten metal A1 in the cavity 11A is referred to as “blank strike time Te”. The time-series data Pe indicated by a two-dot chain line in FIGS. 9 and 10 is actual data when the squeeze pin 4 is idled, and the idle time Te is obtained from the data. In this embodiment, the idle time Te is 3 seconds. The intersection Ce of the time series data Pe and the full stroke depth Lf is shown in FIGS. The reference time Tg is set longer than the idle driving time Te. In the present embodiment, the reference time Tg is set to 4 seconds longer than the idle driving time Te.

  Such setting of the reference time Tg is performed by the fourth processing unit 54 shown in FIG. The fourth processing unit 54 holds the idle time Te and the set reference time Tg.

  Next, the process proceeds to step S102, and it is determined whether or not the squeeze pin 4 is in the initial position. At this time, the squeeze pin operation determination device 1 receives information indicating whether or not the squeeze pin 4 is in the initial position from the die casting machine control unit 10C.

  If “No” in step S102, it means that the precondition for the squeeze pin 4 to start the pressurizing operation is not satisfied, and the process proceeds to step S112. In step S112, a defective product signal is transmitted to the product take-out machine 20, and the program ends. The product take-out machine 20 that has received the defective product signal sorts and transfers the taken-out pressure cast product A2 to the defective product storage area.

  On the other hand, if “Yes” in the step S102, the process proceeds to a step S103. In step S103, when a squeeze start signal is received from the die casting machine control unit 10C, the process proceeds to step S104.

  In step S104, the pulse output of the flow sensor 6 is converted and time series data of the squeeze pin 4, for example, time series data P1 to P8 shown in FIGS. 9 and 10 are measured. This measurement is performed by the first processing unit 51 shown in FIG. Then, the process proceeds to step S105.

  In step S105, the reach depth La at which the squeeze pin 4 is displaced from the initial position and stops due to the solidification of the molten metal A1 is measured. The reach depth La is the maximum value of displacement in the time series data of the squeeze pin 4 measured in step S104. This measurement is performed by the first processing unit 51 shown in FIG.

  Next, the process proceeds to step S106, and it is determined whether or not the reaching depth La is less than the second depth L2. This determination is made by the third processing unit 53 shown in FIG.

  If “Yes” in step S106, the displacement of the squeeze pin 4 is delayed with respect to the progress of solidification of the molten metal A1, and it can be assumed that local pressurization of the squeeze pin 4 is not sufficiently performed. To do. The time series data P4 shown in FIG. 9 and the time series data P8 shown in FIG. 10 correspond to this case. In step S113, a defective product signal is transmitted to the product take-out machine 20, and then the process proceeds to step S114, a shortening signal is transmitted to the timing timer 10T of the die casting control unit 10C, and this program is terminated. . The product take-out machine 20 that has received the defective product signal sorts and transfers the taken-out pressure cast product A2 to the defective product storage area. As shown in FIG. 2, the timing timer 10T that has received the shortening signal shortens the waiting time Tw.

  On the other hand, if “No” in Step S106, the process proceeds to Step S107. In step S107, it is determined whether or not the first depth L1 is set smaller than the full stroke depth Lf. This determination is made by the third processing unit 53 shown in FIG.

  If “No” in step S107, the first depth L1 is set equal to the full stroke depth Lf as shown in FIG. 10, and the process proceeds to step S121 shown in FIG. The processing after step S121 will be described later.

  On the other hand, if “Yes” in step S107 shown in FIG. 7, the process proceeds to step S108. In step S108, it is determined whether the reaching depth La is equal to or less than the first depth L1. This determination is made by the third processing unit 53 shown in FIG.

  If “Yes” in step S108, it can be estimated that the squeeze pin 4 is displaced and the local pressurization of the squeeze pin 4 is sufficiently performed in accordance with the progress of solidification of the molten metal A1, and therefore, the process proceeds to step S111. The time series data P3 shown in FIG. 9 corresponds to this case. In step S111, a non-defective product signal is transmitted to the product take-out machine 20, and the program is terminated. The product take-out machine 20 that has received the non-defective product signal sorts and transfers the taken-out pressure cast product A2 to the good product storage area.

  On the other hand, if “No” in Step S108, the process proceeds to Step S109. In step S109, a required time Ta1 until the squeeze pin 4 reaches the first depth L1 from the initial position is calculated. The required time Ta1 is calculated based on the reception timing of the squeeze start signal and the time series data of the squeeze pin 4 measured in step S104. This process is performed by the second processing unit 52 shown in FIG.

  Next, the process proceeds to step S110, and it is determined whether the required time Ta1 is equal to or longer than the reference time Tg. This determination is made by the fourth processing unit 54 shown in FIG.

  If “Yes” in step S110, as the squeeze pin 4 reaches the full stroke depth Lf or in the vicinity thereof as the solidification of the molten metal A1 progresses, the local pressurization of the squeeze pin 4 is about to solidify. Since it can be presumed that the molten metal A1 is reliably transmitted to the entire molten metal A1, the process proceeds to step S111. The time series data P2 shown in FIG. 9 corresponds to this case. An intersection C2 between the time-series data P2 and the first depth L1 is shown in FIG. The intersection C2 is located on the longer side than the reference time Tg. In step S111, a non-defective product signal is transmitted to the product take-out machine 20, and the program is terminated. The product take-out machine 20 that has received the non-defective product signal sorts and transfers the taken-out pressure cast product A2 to the good product storage area.

  On the other hand, if “No” in step S110, it can be assumed that the displacement of the squeeze pin 4 is too early with respect to the progress of solidification of the molten metal A1, and the local pressurization of the squeeze pin 4 is not sufficiently performed. The process proceeds to step S115. The time series data P1 shown in FIG. 9 corresponds to this case. An intersection C1 between the time series data P1 and the first depth L1 is shown in FIG. The intersection C1 is located on the shorter side than the reference time Tg. In step S115, a defective product signal is transmitted to the product take-out machine 20, and then the process proceeds to step S116, a delay signal is transmitted to the timing timer 10T of the die casting control unit 10C, and this program ends. . The product take-out machine 20 that has received the defective product signal sorts and transfers the taken-out pressure cast product A2 to the defective product storage area. As shown in FIG. 2, the timing timer 10T that has received the delay signal increases the waiting time Tw.

  When the process proceeds from step S107 shown in FIG. 7 to step S121 shown in FIG. 8, it is determined whether or not the reaching depth La is less than the first depth L1 (= full stroke depth Lf). This determination is made by the third processing unit 53 shown in FIG.

  If “Yes” in step S121, it can be assumed that the squeeze pin 4 is displaced and the local pressurization of the squeeze pin 4 is sufficiently performed in accordance with the progress of solidification of the molten metal A1, and therefore, the process proceeds to step S124. The time series data P7 shown in FIG. 10 corresponds to this case. In step S124, a good product signal is transmitted to the product take-out machine 20, and the program is terminated. The product take-out machine 20 that has received the non-defective product signal sorts and transfers the taken-out pressure cast product A2 to the good product storage area.

  On the other hand, if “No” in Step S121, the process proceeds to Step S122. In step S122, the required time Ta1 is calculated. The calculation of the required time Ta1 is the same as in step S109.

  Next, the process proceeds to step S123, and it is determined whether the required time Ta1 is equal to or longer than the reference time Tg. This determination is the same as in step S110.

  If “Yes” in step S123, the entire molten metal A1 just before the local pressurization of the squeeze pin 4 solidifies as the squeeze pin 4 reaches the full stroke depth Lf as the solidification of the molten metal A1 progresses. Therefore, the process proceeds to step S124. The time series data P6 shown in FIG. 10 corresponds to this case. An intersection C6 between the time series data P6 and the first depth L1 is shown in FIG. The intersection C6 is located on the longer side than the reference time Tg. In step S124, a good product signal is transmitted to the product take-out machine 20, and the program is terminated. The product take-out machine 20 that has received the non-defective product signal sorts and transfers the taken-out pressure cast product A2 to the good product storage area.

  On the other hand, if “No” in step S123, the displacement of the squeeze pin 4 is too early with respect to the progress of solidification of the molten metal A1, and it can be assumed that the local pressurization of the squeeze pin 4 cannot be sufficiently performed. The process proceeds to step S125. The time series data P5 shown in FIG. 10 corresponds to this case. FIG. 10 shows an intersection C5 between the time series data P5 and the first depth L1. The intersection C5 is located on the side where the time is shorter than the reference time Tg. In step S125, after sending a defective product signal to the product take-out machine 20, the process proceeds to step S126, where a delay signal is sent to the timing timer 10T of the die casting control unit 10C, and this program is terminated. . The product take-out machine 20 that has received the defective product signal sorts and transfers the taken-out pressure cast product A2 to the defective product storage area. As shown in FIG. 2, the timing timer 10T that has received the delay signal increases the waiting time Tw.

  Thus, when the squeeze pin operation determination device 1 finishes the non-defective / unstable product determination program for the shot, the program is executed again at the start of the next shot.

<Relationship with Invention Specific Items>
The third processing unit 53 and the fourth processing unit 54 illustrated in FIG. 2 and step S101 illustrated in FIG. 7 are examples of the “setting unit” of the present invention. Step S101 shown in FIG. 7 is an example of the “setting step” in the present invention.

  The first processing unit 51 shown in FIG. 2 and step S105 shown in FIG. 7 are examples of the “reach depth measuring means” of the present invention. Step S105 shown in FIG. 7 is an example of the “reach depth measurement step” in the present invention.

  The third processing unit 53 shown in FIG. 2, steps S106 and S108 shown in FIG. 7, and step S121 shown in FIG. 8 are examples of the “first determination unit” of the present invention. Further, steps S106 and S108 shown in FIG. 7 and step S121 shown in FIG. 8 are examples of the “first determination step” of the present invention.

  The second processing unit 52 shown in FIG. 2, step S109 shown in FIG. 7, and step S122 shown in FIG. 8 are examples of the “required time measuring means” of the present invention. Step S109 shown in FIG. 7 and step S122 shown in FIG. 8 are examples of the “required time measurement step” of the present invention.

  The fourth processing unit 54 shown in FIG. 2, step S110 shown in FIG. 7, and step S123 shown in FIG. 8 are examples of the “second determination unit” in the present invention. Step S110 shown in FIG. 7 and step S123 shown in FIG. 8 are examples of the “second determination step” in the present invention.

  The third processing unit 53 and the fourth processing unit 54 shown in FIG. 2, steps S114 and S116 shown in FIG. 7, and step S126 shown in FIG. 8 are examples of the “adjustment unit” of the present invention.

<Effect>
In the squeeze pin operation determination device 1 and the squeeze pin operation determination method of the embodiment, as shown in FIGS. 7 to 10, the second processing unit 52 shown in FIG. 2 performs step S109 shown in FIG. 7 and step shown in FIG. In S122, the required time Ta1 until the squeeze pin 4 reaches the first depth L1 from the initial position is measured.

  Then, in the fourth processing unit 54 shown in FIG. 2, if the required time Ta1 is equal to or longer than the reference time Tg in step S110 shown in FIG. 7 and step S123 shown in FIG. to decide.

  That is, in this squeeze pin operation determining apparatus 1, the squeeze pin is adjusted in accordance with the progress of solidification of the molten metal A1 by the fourth processing unit 54 shown in FIG. 2, step S110 shown in FIG. 7, and step S123 shown in FIG. The squeeze pin 4 is based on the condition that it can be presumed that the local pressurization of the squeeze pin 4 is reliably propagated to the entire molten metal A1 just before solidification by reaching the full stroke depth Lf or its vicinity. Can be selected from the pressure cast products A2 when the full stroke depth Lf or the vicinity thereof is reached. Specifically, the pressure applied to the time series data P2 and P6 from the time series data P1 and P2 shown in FIG. 9 and the plurality of pressure cast products A2 related to the time series data P5 and P6 shown in FIG. While the casting A2 is selected as a non-defective product, the pressure casting product A2 according to the time series data P1 and P5 can be selected as a defective product.

  Therefore, in the squeeze pin operation determination device 1 and the squeeze pin operation determination method of the embodiment, the yield of the pressure casting product A2 can be improved.

  Further, in this squeeze pin operation determination device 1, in step S114 shown in FIG. 7, a shortening signal for shortening the waiting time Tw is transmitted to the timing timer 10T. Further, in step S116 shown in FIG. 7 and step S125 shown in FIG. 8, a delay signal for increasing the waiting time Tw is transmitted to the timing timer 10T. In this way, in this squeeze pin operation determination device 1, the timing for starting the press operation of the squeeze pin 4 can be suitably adjusted according to the actual operation state of the squeeze pin 4, so that the yield of the press cast product A2 can be increased. This can be further improved.

  Further, in the squeeze pin operation determination device 1, as shown in FIGS. 9 and 10, the reference time Tg is set longer than the idle driving time Te of the squeeze pin 4. For this reason, in this squeeze pin operation determination apparatus 1, the reference time Tg can be set suitably, and a non-defective product / defective product determination can be performed more accurately.

  In the squeeze pin operation determination device 1, the first depth L1 is set to be 90% or more of the full stroke depth Lf. For this reason, in this squeeze pin operation determination device 1, the first depth L1 is close to the condition of the pressure operation that can effectively suppress the occurrence of casting defects, thereby further increasing the yield of the pressure cast product A2. Can be improved.

  Further, in the squeeze pin operation determination device 1, as shown in FIGS. 9 and 10, time series data of displacement of the squeeze pin 4, for example, time series data P1 to P8 is displayed on the display unit 9 in a graph. The reference time Tg and the required time Ta1 are displayed in a graph on the display unit 9 so as to overlap the time series data. Thereby, in this squeeze pin operation determination apparatus 1, the operator of the die-casting machine 10 can easily recognize the non-defective / defective product determination status. Further, by displaying the latest time-series data superimposed on the past time-series data, the operator can easily recognize the tendency of non-defective / defective product determination.

  While the present invention has been described with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be appropriately modified and applied without departing from the spirit thereof.

  The present invention is not limited to the manufacture of aluminum die-cast products, and can be applied to the manufacture of pressure cast products made from various metals.

  The present invention is applicable to a die casting machine and a die casting process.

DESCRIPTION OF SYMBOLS 1 ... Squeeze pin operation | movement determination apparatus 4 ... Squeeze pin 5 ... Hydraulic cylinder 6 ... Flow sensor 9 ... Display part 10 ... Die-casting machine 11 ... Die 11A ... Cavity 10T ... Timing timer A1 ... Molten metal A2 ... Pressurized casting product Lf ... Full Stroke depth L1 ... 1st depth L2 ... 2nd depth Tg ... Reference time La ... Achieving depth Ta1 ... Time required for squeeze pin to reach 1st depth from initial position Tw ... Squeeze in pressurizing operation Waiting time until the pin starts to be displaced from the initial position Te ...

Claims (5)

Squeeze pin operation judgment used in die casting machines that produce pressurized castings by performing a pressurization operation to pressurize the molten metal filled in the mold cavity locally with a squeeze pin. A device,
A first depth that is not more than a full stroke depth at which the squeeze pin enters most into the cavity from an initial position, a second depth that is smaller than the first depth, and the squeeze pin reaches the first depth. Or setting means for setting a reference time when passing through the first depth;
In the pressurizing operation, an arrival depth measuring means for measuring an arrival depth at which the squeeze pin is displaced from the initial position and stops due to solidification of the molten metal,
In the case where the first depth is set equal to the full stroke depth, if the reaching depth is less than the first depth and greater than or equal to the second depth, the pressure cast product is a non-defective product When the first depth is set to be smaller than the full stroke depth and the reaching depth is not more than the first depth and not less than the second depth, the pressure cast product First judging means for judging that the product is non-defective,
When the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth, it is necessary for the squeeze pin to reach the first depth from the initial position. A time measuring means for measuring the time required, and measuring the time required if the reaching depth is larger than the first depth when the first depth is set smaller than the full stroke depth; ,
If the required time is equal to or longer than the reference time, the second determining means for determining that the pressure cast product is a non-defective product ,
The squeeze pin operation determination is characterized in that the reference time is set longer than the idle time for the squeeze pin to reach the full stroke depth from the initial position when the molten metal is not present in the cavity. apparatus. The die casting machine includes a timing timer that controls a waiting time until the squeeze pin starts to be displaced from the initial position in the pressurizing operation,
The squeeze pin operation determining device may be configured such that when the first depth is set equal to the full stroke depth, the reach depth is equal to the first depth and the required time is shorter than the reference time. , A delay signal for increasing the waiting time is transmitted to the timing timer, and when the first depth is set smaller than the full stroke depth, the reaching depth is the first depth. If the required time is shorter than the reference time, the delay signal is transmitted to the timing timer. If the arrival depth is smaller than the second depth, the waiting time is set. 2. The squeeze pin operation determination device according to claim 1, further comprising an adjusting means for transmitting a shortening signal for shortening to the timing timer. . The squeeze pin operation determination device according to claim 1 or 2, wherein the first depth is set to be 90% or more of the full stroke depth. Display of time series data when the squeeze pin is displaced from the initial position to the arrival depth in the pressurization operation as a graph and displaying the reference time and the required time as a graph superimposed on the time series data squeeze pin operation determining device according to any one of claims 1 to 3, further comprising a part. The squeeze pin operation determination is performed in a die casting process for producing a pressure cast product by performing a pressurization operation to locally pressurize the molten metal filled in the mold cavity with the squeeze pin. A method,
A first depth that is not more than a full stroke depth at which the squeeze pin enters most into the cavity from an initial position, a second depth that is smaller than the first depth, and the squeeze pin reaches the first depth. Or a setting step for setting a reference time when passing through the first depth;
In the pressurizing operation, an arrival depth measurement step of measuring an arrival depth at which the squeeze pin is displaced from the initial position and stops due to solidification of the molten metal;
In the case where the first depth is set equal to the full stroke depth, if the reaching depth is less than the first depth and greater than or equal to the second depth, the pressure cast product is a non-defective product When the first depth is set to be smaller than the full stroke depth and the reaching depth is not more than the first depth and not less than the second depth, the pressure cast product A first determination step of determining that the product is non-defective,
When the first depth is set equal to the full stroke depth and the reaching depth is equal to the first depth, it is necessary for the squeeze pin to reach the first depth from the initial position. A required time measuring step for measuring the required time if the first depth is set smaller than the full stroke depth and the reach depth is larger than the first depth when measuring the time. ,
If the required time is equal to or longer than the reference time, a second determination step of determining that the pressure cast product is a non-defective product ,
The squeeze pin operation determination is characterized in that the reference time is set longer than the idle time for the squeeze pin to reach the full stroke depth from the initial position when the molten metal is not present in the cavity. Method.

Images