JP2005169432A - Apparatus for managing accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for managing an accumulator with which the filling and exhausting works of gas in the accumulator can suitably and easily be performed according to necessary casting pressure. <P>SOLUTION: The apparatus for managing the accumulator manages the amount of gas filled into the accumulator which has a gas chamber 10a and a hydraulic oil chamber 10b separated from each other by a piston and supplies the hydraulic oil OP of a pressure according to the filling amount of the working gas filled into the gas chamber 10a to an injection device 110 in a die casting machine from the hydraulic oil chamber 10b, wherein the apparatus for managing the accumulator is provided with: an input device 3 as the casting pressure setting means for setting the necessary casting pressure in the injection device 110; a pressure detecting instrument 5 for detecting the pressure in the gas chamber 10a; a controller 2 as an indicating means for indicating the work for setting the pressure in the gas chamber 10a to be the necessary pressure for achieving the casting pressure based on the pressure detected with the pressure detecting instrument 5; and a display device 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an accumulator management device used in an injection device of a die casting machine.

The die-casting machine casts a die-cast product by supplying molten metal to a sleeve of an injection device provided for a mold and injecting and filling the molten metal into a cavity of the mold.
The above injection device includes, for example, a cylinder incorporating an injection piston and a pressure-increasing piston connected to a plunger, an accumulator for supplying hydraulic pressure for driving the cylinder, and the like.
The accumulator used in the injection device has, for example, a gas chamber and a hydraulic oil chamber defined by a piston. The gas chamber is filled with a working gas such as nitrogen gas, the working gas is compressed to accumulate pressure, and the hydraulic pressure required for casting is supplied from the working oil chamber to the cylinder of the injection device.
A technique for filling the accumulator with gas is disclosed in, for example, Patent Document 1.
JP 2003-301560 A

By the way, the casting pressure that can be set by the accumulator is limited to a certain range. This range is determined by the amount of working gas charged in the gas chamber. For this reason, when the target casting pressure cannot be obtained with the current working gas filling amount, it is necessary to discharge the working gas from the accumulator or to fill the accumulator with the working gas.
At this time, it takes a lot of work to calculate the amount of working gas filled in the gas chamber and perform the filling and discharging operation of the working gas while confirming whether the amount of gas has reached the target casting pressure. For this reason, the operation of filling and discharging the working gas is roughly performed.
On the other hand, if the work of filling and releasing the working gas is roughly performed, the gas may be overfilled or released too much. Difficult to do.

  The present invention has been made in view of the above-described problems, and the object thereof is to appropriately and easily execute the operation of filling and releasing the gas in the accumulator according to the required casting pressure. It is to provide an accumulator management device.

  A first aspect of the present invention includes a gas chamber and a hydraulic fluid chamber partitioned by a piston, and hydraulic fluid corresponding to a filling amount of gas charged in the gas chamber is supplied from the hydraulic fluid chamber. An accumulator management device for managing a gas filling amount of an accumulator supplied to an injection device of a die casting machine, a casting pressure setting means for setting a casting pressure required in the injection device of the die casting machine, and a gas chamber of the accumulator Based on the pressure detection means for detecting the pressure and the pressure detected by the pressure detection means, the pressure in the gas chamber is set to a pressure necessary to achieve the set casting pressure set by the casting pressure setting means. Instruction means for instructing work for the purpose.

  Preferably, the instruction means instructs one of filling of the gas into the gas chamber and discharge of the gas from the gas chamber based on the pressure detected by the pressure detection means, and the pressure detection means When the detected pressure reaches the required pressure, an instruction to stop filling or releasing gas is given.

  More preferably, the instruction means instructs the discharge of the working fluid from the working fluid chamber of the accumulator prior to the instruction of filling or releasing the gas.

  A second aspect of the present invention includes a gas chamber and a hydraulic fluid chamber partitioned by a piston, and hydraulic fluid corresponding to a filling amount of gas charged in the gas chamber is supplied from the hydraulic fluid chamber. An accumulator management device for managing a gas filling amount of an accumulator supplied to an injection device of a die casting machine, a casting pressure setting means for setting a casting pressure required in the injection device of the die casting machine, and a gas chamber of the accumulator A pressure detecting means for detecting pressure, a filling control valve for opening and closing a gas filling path to the gas chamber, a discharging control valve for opening and closing a gas discharging path from the gas chamber, and the pressure detecting means Based on the detected pressure, the filling control valve and the gas chamber are required to achieve the pressure of the gas chamber required to achieve the set casting pressure set by the casting pressure setting means. And a control means for opening and closing the fine said discharge control valve.

  In the present invention, when the casting pressure required for the injection device of the die casting machine is set by the casting pressure setting means, the indicating means needs the gas chamber based on the pressure of the gas chamber of the accumulator detected by the pressure detecting means. Instruct the work to achieve pressure. When the operation is performed according to this instruction, the working gas is discharged and filled in the accumulator appropriately so that the required casting pressure is obtained.

  According to the present invention, the operation of filling and releasing the working gas of the accumulator can be performed appropriately and easily according to the required casting pressure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First Embodiment FIG. 1 is a diagram showing a configuration of a die casting machine to which an accumulator management device according to an embodiment of the present invention is applied.
In FIG. 1, the accumulator management device according to the present embodiment includes a controller 2, an input device 3 connected to the controller 2, a display device 4, a pressure detector 5, and the like.

The die casting machine 100 includes a mold 100 and an injection device 110.
The mold 100 includes a moving mold 101A and a fixed mold 101B. A molten metal such as an aluminum alloy is injected and filled into the cavity 102 formed between the movable mold 101A and the fixed mold 101B which are clamped by a mold clamping device (not shown), and a die-cast product is molded. The

The injection device 110 includes a sleeve 112, a plunger 113, an injection cylinder 120, a hydraulic circuit 130, the accumulator 10, and the like.
The sleeve 112 is provided on the back side of the solid mold 101 </ b> B so as to communicate with the cavity 102. For example, a molten metal is supplied to the sleeve 112 by a ladle 115, and the plunger 113 fitted to the sleeve 112 is advanced to inject and fill the molten metal supplied to the sleeve 112 into the cavity 102. .

The injection cylinder 120 has two cylinder chambers 121 and 123 communicating with each other and having different diameters.
The cylinder chamber 121 on the small diameter side incorporates an injection piston 122, and the cylinder chamber 123 on the large diameter side incorporates a pressure increasing piston 124.

The injection piston 122 is connected to the piston rod 125, and the piston rod 125 is connected to the plunger 113.
The pressure-increasing piston 124 is disposed behind the injection piston 122.

  The hydraulic circuit 130 is connected to the cylinder chamber 121 and the cylinder chamber 123, and includes a hydraulic source 131, an injection speed adjusting valve 137, a check valve 136, a pressure increasing check valve 135, and the like.

The injection speed adjusting valve 137 and the check valve 136 are provided in the middle of a pipe line connecting the accumulator 10 and the cylinder chamber 121.
The injection speed adjustment valve 137 is an electromagnetic control valve that is driven by a solenoid 138, and the opening degree of the valve is detected by the encoder 139. The injection speed adjusting valve 137 is controlled by a control command S2v from the controller 2 based on the valve opening detected by the encoder 139. The injection speed is controlled by controlling the injection speed adjusting valve 137.
The check valve 136 allows the hydraulic oil to flow into the cylinder chamber 121 from the injection speed adjusting valve 137 side, and when the pressure increasing piston 124 is driven, the hydraulic oil between the pressure increasing piston 124 and the injection piston 122. Is provided to prevent the fuel from flowing out from the cylinder chamber 121 to the injection speed adjusting valve 137 side.

  The pressure increasing check valve 135 is provided in the middle of a pipe line connecting the accumulator 10 and the cylinder chamber 123. The pressure increase check valve 135 can be adjusted by a motor, and when the pressure increase check valve 135 is opened, high pressure hydraulic oil is supplied from the accumulator 10 to the cylinder chamber 123. The hydraulic pressure of the hydraulic oil at this time becomes the casting pressure.

The accumulator 10 incorporates a piston 11 and has a gas chamber 10a and a hydraulic oil chamber 10b defined by the piston 11. The gas chamber 10a and the hydraulic oil chamber 10b are sealed.
The gas chamber 10a is compressed and filled with a working gas G such as nitrogen gas, for example. A pipe for connecting a gas cylinder 80 is connected to the gas chamber 10a, and a manual opening / closing valve 21 is provided in the middle of the pipe.
The gas chamber 10a is filled with the working gas G by connecting the gas cylinder 80 containing the compressed high-pressure working gas to the gas chamber 10a of the accumulator 10 and opening the manual opening / closing valve 21.
The gas chamber 10a is provided with a manual opening / closing valve 20. By opening the manual opening / closing valve 20, the working gas G in the gas chamber 10a can be released.

The hydraulic oil chamber 10b of the accumulator 10 is filled with hydraulic oil. The hydraulic oil 131 is used to fill the hydraulic oil chamber 10 b with hydraulic oil. Specifically, when high-pressure hydraulic oil is supplied from the hydraulic source 131 with the injection speed adjustment valve 137 and the pressure increase check valve 135 closed, the hydraulic oil is filled into the hydraulic oil chamber 10b of the accumulator 10. Thereby, the working gas G existing in the gas chamber 10a is compressed, and thereby energy necessary for casting pressure is stored.
A manual open / close valve 22 is provided in the middle of the pipe line connecting the hydraulic oil chamber 10b and the injection cylinder 120. When the manual open / close valve 22 is opened, the hydraulic oil OP in the hydraulic oil chamber 10b is released to the outside. can do.
In the present embodiment, oil is used as the working fluid of the accumulator 10, but other liquids can also be used.

  The pressure detector 5 detects the pressure Pn in the gas chamber 10 a and outputs a detection signal 5 s to the controller 2.

The controller 2 comprehensively controls the die casting machine 110 and constitutes an embodiment of the casting pressure setting means and the instruction means of the present invention together with the input device 3 and the display device 4.
The controller 2 includes hardware such as a microprocessor and a memory, and necessary software.

The input device 3 inputs various data to the controller 2. The input device 3 is composed of, for example, a keyboard and a touch panel.
The display device 4 is composed of, for example, a liquid crystal panel or CRT, and displays various data from the controller 2.

Next, an example of a processing procedure in the accumulator management apparatus configured as described above will be described with reference to the flowchart shown in FIG.
When the casting pressure in the die casting machine 100 is changed, the controller 2 instructs the operator of the die casting machine 100 to release all the hydraulic oil in the accumulator 10 (step S1). This instruction is performed by, for example, a method of displaying the instruction content on the display device 4. It is also possible to give a voice instruction through a speaker (not shown).

In this state, as shown in FIG. 3A, the accumulator 10 is filled with the working oil in the working oil chamber 10b, and the working gas G in the gas chamber 10a is compressed due to the presence of the working oil OP in the working oil chamber 10b. Has been. Therefore, the pressure of the working gas G varies according to the amount of the working oil OP in the working oil chamber 10b.
Therefore, in order to calculate the exact filling amount of the working gas G in the gas chamber 10a, all the working oil OP in the working oil chamber 10b is discharged.

When the operator gives an instruction to release all the hydraulic oil OP of the accumulator 10 from the controller 2, the operator releases the hydraulic oil OP of the accumulator 10 by opening the manual on-off valve 22 as shown in FIG. State.
The controller 2 confirms whether or not the release of the hydraulic oil OP from the accumulator 10 has been completed (step S2). For example, the operator notifies the controller 2 that the release of the hydraulic oil OP is completed by the input device 3.

  When the controller 2 confirms the completion of the release of the hydraulic oil OP, the controller 2 starts taking in the pressure Pn detected by the pressure detector 5 (step S3). This pressure Pn is the pressure in the gas chamber 10a of the accumulator 10 in the state shown in FIG.

Next, the controller 2 instructs the operator to set the casting pressure Pc required in the die casting machine 100 through the display device 4 or the like (step S4). This casting pressure is determined from the specifications of the die cast product to be molded.
The controller 2 confirms whether the casting pressure Pc is input by the operator through the input device 3 or the like (step S5).

Next, the controller 2 calculates the pressure Ps in the gas chamber 10a necessary to achieve the set casting pressure Pc (step S6). That is, in order to output the casting pressure Pc set in the die casting machine 100, it is necessary to accumulate a pressure corresponding to the casting pressure Pc in the accumulator 10. If the amount of the working gas G in the accumulator 10 is too small, the casting pressure Pc cannot be output. If the amount of the working gas G is too large, hydraulic oil having a pressure higher than the required casting pressure Pc is supplied to the injection cylinder 120 even if the opening of the pressure increasing check valve 135 is adjusted.
For this reason, it is necessary to calculate the pressure Ps within a range where the casting pressure Pc can be output, and to adjust the filling amount of the working gas G in the gas chamber 10a so as to be the pressure Ps.

  The pressure Ps in the gas chamber 10a necessary to achieve the set casting pressure Pc is calculated by the following equation (1). It is assumed that the tip cross-sectional area of the plunger 113 is Ap, and the cross-sectional area of the pressure increasing piston 124 is Ar.

  Ps = Pc × Ap / Ar (1)

Next, the controller 2 compares the current pressure Pn in the gas chamber 10a detected by the pressure detector 5 with the calculated required pressure Ps (step S7).
When the pressure Pn in the gas chamber 10a is smaller than the required pressure Ps as a result of comparing the two, an instruction is given through the display device 4 or the like to further fill the gas chamber 10a with the working gas G (step S8). . When the pressure Pn in the gas chamber 10a is equal to or higher than the required pressure Ps, an instruction is given through the display device 4 or the like to release the working gas G in the gas chamber 10a (step S12).

When there is an instruction to further fill the working gas G into the gas chamber 10 a, the operator opens the manual on-off valve 21 provided between the gas cylinder 80 and the accumulator 10, and the working gas G is supplied to the accumulator 10. The chamber 10a is filled.
The controller 2 monitors the pressure Pn, and when the charging of the working gas G is started, the pressure Pn increases. Therefore, it is determined whether the pressure Pn has substantially reached the required pressure Ps (step S9). .
When the controller 2 determines that the pressure Pn has substantially reached the required pressure Ps, the controller 2 instructs the operator to stop filling the working gas G through the display device 4 or the like (step S10). The operator closes the manual open / close valve 21 when instructed to stop the filling of the working gas G.
When the controller 2 confirms the stop of the filling of the working gas G (step S11), the process is terminated.

When there is an instruction to release the working gas G from the gas chamber 10a, the operator opens the manual on-off valve 22 and releases the working gas G in the gas chamber 10a of the accumulator 10 to the outside.
The controller 2 monitors the pressure Pn, and when the release of the working gas G is started, the pressure Pn decreases. Therefore, it is determined whether the pressure Pn has substantially reached the required pressure Ps (step S13). .
When the controller 2 determines that the pressure Pn has substantially reached the required pressure Ps, the controller 2 instructs the operator to stop releasing the working gas G through the display device 4 or the like (step S14).
The operator closes the manual opening / closing valve 20 when instructed to stop the release of the working gas G.
When the controller 2 confirms the stop of the release of the working gas G (step S15), the process is terminated.

The release of the working gas G from the accumulator 10 or the filling of the working gas G into the accumulator 10 is performed in a state where the working oil OP is released from the accumulator 10, as shown in FIG.
Therefore, in order to supply high-pressure hydraulic oil to the injection cylinder 120 of the die casting machine 100, the accumulator 10 needs to be in a pressure accumulation state. For this reason, the hydraulic oil OP is supplied from the hydraulic source 131 to the hydraulic oil chamber 10b of the accumulator 10, and the state shown in FIG.
Thereby, it will be in the state which can be cast by the die-casting machine 100. FIG.

  As described above, according to the present embodiment, the pressure of the gas chamber 10a of the accumulator 10 and the required casting pressure Pc are given to the controller 2, and the controller 2 determines the amount of the working gas G of the accumulator 10 based on these pieces of information. Therefore, the operator of the die casting machine 100 only needs to perform the operation of filling and discharging the working gas G of the accumulator 10 required in accordance with the change of the casting conditions in accordance with the instruction from the controller 2. Therefore, the filling and discharging operation of the working gas G in the accumulator 10 is facilitated and speeded up, and an accurate casting pressure Pc can be obtained.

Second Embodiment FIG. 4 is a diagram showing a configuration of a die casting machine to which an accumulator management device according to another embodiment of the present invention is applied.
In the present embodiment, the manual on-off valves 20, 21, and 22 of the first embodiment are changed to control valves 20A, 21A, and 22A, respectively, and these control valves 20A, 21A, and 22A are controlled by the controller 2. . Other configurations are the same as those of the first embodiment.

The controller 2 according to the present embodiment constantly monitors the pressure Pn detected by the pressure detector 5, and based on this pressure Pn and the casting pressure Pc set by the input device 3 or the like, the working gas of the accumulator 10 is obtained. Manage the amount of G.
Specifically, the controller 2 can open and close the control valve 22A by outputting a control command S2c to the control valve 22A, and can automate the release of the hydraulic oil OP in the hydraulic oil chamber 10b.
Further, the controller 2 outputs the control command S2a to the control valve 20A, thereby opening and closing the control valve 20A and automating the operation of releasing the working gas G in the gas chamber 10a.
Further, the controller 2 outputs the control command S2b to the control valve 21A, thereby opening and closing the control valve 21A and automating the operation of filling the gas chamber 10a with the working gas G.
With the above configuration, it is possible to automate the discharge and filling of the working gas G.

The present invention is not limited to the embodiment described above.
In the above-described embodiment, the case where a single accumulator is used has been described. However, for example, the present invention can be applied to a case where different accumulators are used for injection and pressure increase.

It is a figure which shows the structure of the die-casting machine to which the management apparatus of the accumulator which concerns on one Embodiment of this invention was applied. It is a flowchart which shows the process sequence in the management apparatus of an accumulator. It is a figure which shows the state of the accumulator in each step in the filling and discharge | release operation | work of the working gas G. It is a figure which shows the structure of the die-casting machine to which the management apparatus of the accumulator which concerns on other embodiment of this invention was applied.

Explanation of symbols

2 ... Controller 3 ... Input device 4 ... Display device 10 ... Accumulator 10a ... Gas chamber 10b ... Hydraulic oil chamber 20, 21, 22 ... Manual on-off valve 20A, 21A, 22A ... Control valve 100 ... Die casting machine 101 ... Mold 110 ... Injection device

Claims (4)

A gas chamber defined by a piston and a hydraulic fluid chamber are provided, and hydraulic fluid having a hydraulic pressure corresponding to the amount of working gas charged in the gas chamber is supplied from the hydraulic fluid chamber to an injection device of a die casting machine. An accumulator management device that manages the gas filling amount of an accumulator,
A casting pressure setting means for setting a casting pressure required in the injection device of the die casting machine;
Pressure detecting means for detecting the pressure of the gas chamber of the accumulator;
Instructing means for instructing an operation for setting the pressure in the gas chamber to a pressure required to achieve the set casting pressure set by the casting pressure setting means based on the pressure detected by the pressure detecting means; An accumulator management device. The instruction means instructs one of filling of the gas into the gas chamber and release of the gas from the gas chamber based on the pressure detected by the pressure detection means, and the pressure detected by the pressure detection means 2. The accumulator management device according to claim 1, wherein when the pressure reaches a required pressure, an instruction is given to stop charging or discharging the working gas. The accumulator management device according to claim 2, wherein the instructing unit instructs the discharge of the hydraulic fluid from the hydraulic fluid chamber of the accumulator prior to an instruction to fill or release the gas. A gas chamber defined by a piston and a hydraulic fluid chamber are provided, and hydraulic fluid having a hydraulic pressure corresponding to the amount of working gas charged in the gas chamber is supplied from the hydraulic fluid chamber to an injection device of a die casting machine. An accumulator management device that manages the gas filling amount of an accumulator,
A casting pressure setting means for setting a casting pressure required in the injection device of the die casting machine;
Pressure detecting means for detecting the pressure of the gas chamber of the accumulator;
A filling control valve for opening and closing a gas filling path to the gas chamber;
A discharge control valve for opening and closing a gas discharge path from the gas chamber;
Based on the pressure detected by the pressure detection means, the control valve for filling and the discharge so as to be the pressure of the gas chamber required to achieve the set casting pressure set by the casting pressure setting means An accumulator management device comprising: control means for opening and closing a control valve for use.

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