JP4579667B2 - Injection molding machine and injection molding method - Google Patents

Description

  The present invention relates to an injection molding machine and an injection molding method for molding a plurality of types of products in a single injection process.

2. Description of the Related Art Conventionally, there has been known an injection molding machine that forms a plurality of products having the same shape in a single injection process by using a plurality of mold sets having the same shape and one injection device. (For example, see FIG. 2 of the following publicly known document 1)
Alternatively, an injection molding machine that simultaneously molds a plurality of types of products in a single injection process by using a mold set having a plurality of types of cavities and one injection device has also been proposed. This injection molding machine is suitable for manufacturing a product that uses a plurality of injection molded products as one set, such as a pair of left and right parts of an automobile, a container body and a lid.

  According to this type of injection molding machine, there is no excess or deficiency of parts necessary for one set, and the parts integration can be simplified. However, the shapes and sizes of a plurality of types of injection-molded products constituting such a set are not necessarily similar, and there are many cases where the shapes and injection masses are greatly different, such as a container body and a lid.

  FIG. 5 shows a part of a conventional injection molding machine 101. This injection molding machine 101 includes a fixed mold 103 attached to a fixed platen 102 and a moving mold 105 attached to a moving plate 104, and a mold set is constituted by these molds 103 and 105. ing. The injection molding machine 101 includes a sprue 106 into which a material (for example, resin) is injected from a nozzle of an injection device (not shown), a runner 107 and a gate 108 that serve as a flow path for the injected material.

  The moving board 104 can be moved in the front-rear direction (left-right direction in FIG. 5) by a driving device (not shown). Cavities 110 and 111 are formed by combining the moving-side mold 105 and the fixed-side mold 103. The cavities 110 and 111 communicate with the gate 108. One cavity 110 has a larger injection mass than the other cavity 111.

  A material (for example, molten resin) injected from a nozzle of an injection device (not shown) to the sprue 106 is guided to the cavities 110 and 111 through the runner 107 and the gate 108. This material is cooled and solidified in the cavities 110 and 111. Thereafter, the moving mold 105 is separated from the fixed mold 103 and the ejector pin 113 is pushed out by the push rod 112 to take out the molded product.

  In a conventional injection molding machine, even when products having different injection masses are molded by a plurality of cavities, molding is performed under the same molding conditions as single-piece molding or multiple-piece molding of the same shape. That is, molding conditions are set as one product molded by a plurality of cavities. This causes the following problems.

  When the material flows into the cavity, the material is immediately cooled to increase the viscosity and decrease the fluidity. Therefore, it is preferable that the injection process completes the filling of the cavity in as short a time as possible. However, when the material is filled at high speed, it is difficult to instantaneously absorb the inertia of the material at the moment when the space in the cavity is filled with the material. For this reason, there is a high possibility that a surge pressure is generated and burrs are generated in the product. Therefore, it is common to control the speed of the injection plunger so as to reduce the filling speed before filling is completed.

  FIG. 6 shows a control diagram of a conventional general injection process. The horizontal axis in FIG. 6 represents the position of the injection plunger, and the vertical axis represents the filling speed. During injection, the injection plunger moves from right to left on the horizontal axis. The point S on the horizontal axis is the starting point of the injection process. During the filling process from the S point to the H point, the filling speed is controlled.

That is, the filling speed f1 at the initial stage of the injection process is set to a medium speed in order to prevent disturbance at the start of material flow into the mold. The subsequent filling speed f2 is set to a high speed in order to complete filling in as short a time as possible. The filling speed f3 immediately before the completion of filling is set to a low speed in order to absorb the inertia of the material flow. Filling is completed at point H. From the H point to the E point is a pressure holding process for controlling the pressure. The molded product is cooled and solidified in this pressure holding step. Since the material shrinks during cooling, it is necessary to continue to apply pressure to prevent molding defects.
Japanese Patent Publication No. 63-4487

  In the injection molding machine shown in FIG. 5, when controlled based on the control diagram of FIG. 6, the filling of the cavity 111 having a small injection mass is completed first in the section of the high filling speed f2, but the injection mass is large. The cavity 110 continues to be filled at high speed. For this reason, in the cavity 111 with a small injection mass, burrs are easily generated in the product due to the surge pressure generated by the inertia of high-speed filling.

  As a method for preventing the above problem, as shown in FIG. 7, it is conceivable to lower the filling speed f2 to a filling speed f4 during the molding. However, since the filling speed f4 is lower than that of f2, the cooling of the material proceeds in this section, and the material temperature greatly decreases when filling is completed. Therefore, it is easy to cause molding defects such as insufficient filling in the cavity 110 that finally completes filling, or a recess (so-called sink) on the surface of the product.

  In other words, in the conventional molding method, it is difficult to reduce molding defects and improve product quality when molding a plurality of types of products with greatly different injection masses in a single injection process using a plurality of cavities. .

  Accordingly, the present invention relates to an injection molding machine capable of reducing molding defects and improving product quality in an injection molding machine that molds a plurality of products in a single injection process using a plurality of cavities, and an injection molding method. Is to provide.

  An injection molding machine according to the present invention includes a plurality of mold sets having different cavities or one mold set having a plurality of different cavities, and injection capable of filling the plurality of cavities with a material in one injection step. An apparatus; a valve mechanism that opens and closes a material supply channel that communicates with at least one of the plurality of cavities; and a control unit. The control means controls the valve mechanism so as to supply material to one of the cavities in the first injection step of the injection device, and performs injection under molding conditions corresponding to the cavities. In the subsequent section, the valve mechanism is controlled so as to supply material to the other cavity, and injection is performed under molding conditions corresponding to the cavity.

  The valve mechanism may be provided in all the material supply channels that communicate with each cavity, but only the material supply channel that communicates with the cavity that requires changing molding conditions, for example, the injection mass is significantly different from other cavities. A valve mechanism may be provided. In this way, the number of valve mechanisms can be reduced.

  In the injection molding method of the present invention, the injection process is divided into a plurality of sections according to the plurality of cavities, and the material is supplied only to a specific cavity among the plurality of cavities in the previous section performed at the beginning of the injection process. In a state where the valve mechanism is controlled, a material is filled in the cavity based on molding conditions set in accordance with the cavity, and after the previous section is finished, the rear section is performed except for the specific cavity. In a state where the valve mechanism is controlled so that the material is supplied to the other cavity, the material is filled into the cavity based on the molding conditions set in accordance with the other cavity.

  In one form of the injection molding method of the present invention, the front section controls the valve mechanism to open a material supply channel leading to the specific cavity, and the rear section is a material leading to the specific cavity. The valve mechanism is controlled so as to shut off the supply flow path and open the material supply flow path leading to the other cavity.

  In another form of the injection molding method of the present invention, the front section controls the valve mechanism to open a material supply flow path leading to the specific cavity, and the rear section is a material leading to the specific cavity. The valve mechanism is controlled so that the material supply flow path leading to the other cavity is opened while the supply flow path is opened.

  In the injection molding method of the present invention, the control valve mechanism has a valve body provided for each material supply flow path leading to each cavity, and all the valve bodies are closed at the beginning of the injection process. The material may be filled in the state, and then the valve bodies may be sequentially opened in a predetermined order to fill the material for each cavity.

  Moreover, in the injection molding method of the present invention, the section excluding the last section among the plurality of sections divided is a speed that changes the speed at which the injection plunger is advanced according to the position of the injection plunger of the injection device. Control may be performed.

  When performing the speed control, the position of the injection plunger is detected at the boundary of the plurality of sections, and a deviation between a detection signal indicating the actual position of the injection plunger and a signal for driving the injection plunger When the value exceeds the allowable value, an alarm signal may be output. Furthermore, the injection operation of the injection device may be stopped when the signal is output.

  According to the present invention, in an injection molding machine that molds a plurality of types of products in a single injection process using a plurality of cavities and one injection molding machine, even if the shape and injection mass of each cavity are different, The molding conditions for filling each cavity with the material can be optimally set according to the shape and size of each cavity. Therefore, molding defects of a plurality of types of products having different injection masses and shapes can be eliminated, and a product with excellent quality can be obtained.

  Further, the pressure holding process is omitted in the injection process of each cavity other than the cavity in which the molding is performed last among the plurality of cavities, and the pressure holding process is controlled collectively in the injection process of the cavity in which the molding is performed last. By doing so, it becomes possible to shorten the molding cycle until the molding of all the cavities is completed.

  An embodiment of an injection molding machine and an injection molding method of the present invention will be described below with reference to FIGS.

  FIG. 1 shows a part of an injection molding machine 10. The injection molding machine 10 includes an injection apparatus 11, a mold set 14 including a fixed mold 12 and a moving mold 13, a mold clamping apparatus 15, and the like. The mold clamping device 15 includes a fixed platen 20 and a moving platen 21. The moving board 21 is reciprocated in the directions indicated by the arrows A and B along the tie rod 23 by a known driving mechanism 22 using a hydraulic cylinder or a toggle mechanism (schematically shown by a two-dot chain line in FIG. 1). can do.

  A stationary mold 12 is attached to the stationary platen 20. A moving mold 13 is attached to the moving plate 21 via a support member 35. A mold set 14 is constituted by the fixed mold 12 and the movable mold 13. In the state where the moving side mold 13 is joined to the fixed side mold 12, two types of cavities, ie, a first cavity 31 and a second cavity 32, having different sizes (injection masses) and shapes are formed.

  A sprue 36 serving as a material injection hole is opened on the back surface (the right surface in FIG. 1) of the fixed mold 12. The sprue 36 penetrates the stationary mold 12 in the axial direction (direction in which the molds 12 and 13 open and close).

  An extrusion mechanism 40 is provided on the back surface (the left surface in FIG. 1) of the moving plate 21. The pushing mechanism 40 drives the ejector pin 43 through the pushing rod 41 and the pushing plate 42. The ejector pin 43 penetrates the moving side mold 13 in the axial direction. The extrusion rod 41 penetrates the moving board 21 in the axial direction. The rear end portion of the ejector pin 43 is fixed to the pushing plate 42. The pushing plate 42 is coupled to the pushing rod 41, and the ejector pin 43 is driven by the pushing mechanism 40 using a hydraulic cylinder or the like.

  The injection device 11 includes a barrel 51 into which the screw 50 is inserted, an injection actuator 53 including an injection plunger 52 that drives the screw 50 in the axial direction, a rotation mechanism 54 that rotates the screw 50, and the like. A nozzle 55 is formed at the tip of the barrel 51. The nozzle 55 is joined to the inlet of the sprue 36 of the stationary mold 12 at the time of injection.

An example of the injection actuator 53 is a hydraulic cylinder, and the hydraulic pressure supplied from a hydraulic control circuit (hydraulic unit) 60 that generates hydraulic pressure is supplied to the oil chamber in the injection actuator 53, whereby the injection plunger 52 is moved along the axis. Move in the direction. The injection plunger 52 moves from the S ₀ point to the En point in FIG. 3 described later in the injection process. The injection plunger 52 may be driven by a drive source other than hydraulic pressure, for example, an electric motor and a ball screw.

  The injection device 11 includes a sensor 61 for detecting the position of the injection plunger 52. An output of the sensor 61, that is, an electrical signal indicating the position of the injection plunger 52 in the axial direction is input to the controller 62 as control means. The controller 62 is connected to a display 63 that operates when notifying abnormality.

  FIG. 2 shows details of a mold set 14 constituted by a fixed mold 12 and a movable mold 13. The moving side mold 13 faces the fixed side mold 12. When the molds 12 and 13 are joined to each other, a first cavity 31 and a second cavity 32 for molding a material and a runner 70 that is a material supply channel are formed between the molds 12 and 13. These two types of cavities 31 and 32 are different in size (injection mass) and shape. The injection mass of the first cavity 31 is larger than that of the second cavity 32.

  A first gate 71 that is a material supply flow path is formed between the first cavity 31 and the runner 70. A second gate 72 that is a material supply flow path is formed between the second cavity 32 and the runner 70. The first cavity 31 and the runner 70 communicate with each other through the first gate 71. The second cavity 32 and the runner 70 communicate with each other through the second gate 72. Therefore, the material injected from the nozzle 55 of the injection device 11 into the sprue 36 can flow into the cavities 31 and 32 through the runner 70 and the gates 71 and 72.

  A valve mechanism 80 is provided in the moving side mold 13. The valve mechanism 80 includes at least a pair of valve bodies 81 and 82. An example of the valve bodies 81 and 82 has a pin shape. One valve body 81 is for controlling the flow of material from the runner 70 toward the first cavity 31. The other valve body 82 is for controlling the flow of material from the runner 70 toward the second cavity 32.

  These valve bodies 81 and 82 are driven by the opening and closing cylinders 85 and 86 provided on the moving side mold 13 in the direction of opening and closing the gates 71 and 72, respectively (left and right in FIG. 2). The opening and closing cylinders 85 and 86 open and close the valve bodies 81 and 82 by the hydraulic pressure supplied from the hydraulic control circuit 60.

  In a state where one valve body 81 moves in the valve opening direction (left side in FIG. 2), the material supply flow path communicates from the runner 70 to the first gate 71, so that the material flowing into the runner 70 is in the first cavity 31. Can flow into. In a state where the valve body 81 is moved in the valve closing direction (right side in FIG. 2), the first gate 71 is shut off, so that the material flowing into the runner 70 cannot flow into the first cavity 31.

  In a state where the other valve body 82 is moved in the valve opening direction (left side in FIG. 2), the material supply flow path communicates from the runner 70 to the second gate 72, so that the material flowing into the runner 70 is in the second cavity 32. Can flow into. In a state where the valve body 82 is moved in the valve closing direction (right side in FIG. 2), the second gate 72 is blocked, so that the material flowing into the runner 70 cannot flow into the second cavity 32.

FIG. 3A shows an example of a control diagram of the injection device 11. 3A, the horizontal axis represents the position of the injection plunger 52, and the vertical axis represents the filling speed (speed at which the injection plunger 52 advances). Molding process in S ₀ point is started, the molding process is completed En point.

Forming step includes the first interval X1 (from _{S 0} point to point S1) to be performed at the beginning, consisting (from the point S1 to En point) second interval X2 performed thereafter with. The first section X1 corresponds to the previous section referred to in the present invention. The second section X2 corresponds to the rear section referred to in the present invention. In the first section X1, the first cavity 31 is filled with a material (for example, molten resin). In the second section X2, the second cavity 32 is filled with material. That is, the filling process is repeated twice in one injection process.

In the first section X1, from _{S 0} point to H1 point, a step of filling the material into the first cavity 31, f11 a filling rate in accordance with the position of the injection plunger 52, f12, f13 to alter. That is, speed control for switching speed according to the position of the injection plunger 52 is performed. From the H1 point to the S1 point is a pressure holding step for keeping the injection pressure constant, and a predetermined pressure is maintained for a predetermined time by a timer (not shown).

  In the second section X2, points S1 to H2 are steps for filling the second cavity 32 with the material, and the filling speed is changed to f21, f22, and f23 according to the position of the injection plunger 52. That is, speed control for switching speed according to the position of the injection plunger 52 is performed. From the H2 point to the En point is a pressure holding process for keeping the injection pressure constant, and a predetermined pressure is maintained for a predetermined time by a timer (not shown).

Next, an example of an injection molding method using the injection molding machine 10 will be described.
First, the movable platen 21 is moved in the mold clamping direction (the right direction in FIGS. 1 and 2), and the movable side mold 13 is joined to the fixed side mold 12, whereby the cavities 31, 32, the runner 70, Gates 71 and 72 are formed.

By moving one valve body 81 in the valve opening direction by the opening / closing cylinder 85 and moving the other valve body 82 in the valve closing direction by the opening / closing cylinder 86, the material flows only in the first cavity 31. The material supply channel is set in In this state, to start the injection from S ₀ point in FIG. 3 (A), it performs a first section X1 of one injection step.

  In the first section X1, injection is performed while changing the filling speed to f11, f12, and f13. The filling speed f11 is set to a medium speed value in order to prevent disturbance when the material starts to flow into the molds 12 and 13. The filling speed f12 is set to a high speed value in order to complete filling in as short a time as possible. The filling speed f13 is set to a low value in order to absorb the inertia of the flow of the material immediately before the filling is completed.

  According to the present embodiment, most of the first section X1 is filled at the high filling speed f12 and switched to the low filling speed f13 immediately before the filling is completed, so that the temperature drop of the material during filling can be minimized. Moreover, the occurrence of surge pressure when filling is completed can be suppressed. Then, at point H1, the pressure control is switched from the speed control described above to pressure control using a timer, and the pressure holding process is started. The first section X1 ends when the timer times out.

  After the first section X1 is completed, one valve body 81 is moved in the valve closing direction by the opening / closing cylinder 85, and the material supply flow path from the runner 70 to the first cavity 31 is closed. At the same time, the other valve body 82 is moved in the valve opening direction by the opening / closing cylinder 86 to open the material supply flow path from the runner 70 to the second cavity 32. That is, the material supply channel is set so that the material flows only through the second cavity 32. In this state, molding of the second section X2 is started.

  In the second section X2, injection is performed while changing the filling speed to f21, f22, and f23. The filling speed f <b> 21 is set to a medium speed value in order to prevent disturbance when the material starts to flow into the molds 12 and 13. The filling speed f22 is set to a high speed value in order to complete filling in as short a time as possible. The filling speed f23 is set to a low value in order to absorb the inertia of the flow of the material just before the filling is completed.

  Most of the second section X2 is also filled at a high filling speed f22, and is switched to a low filling speed f23 immediately before the completion of filling, so that the temperature drop of the material during filling can be suppressed to a minimum, and when filling is completed. The generation of surge pressure is also suppressed. At point H2, the pressure control is switched from the speed control described above to pressure control using a timer, and the pressure holding process is started. The second section X2 ends when the timer times out.

  The injection pressure in the present embodiment changes as shown in (B) in FIG. The horizontal axis represents the position of the injection plunger 52, and the vertical axis represents the injection pressure. Since the injection pressure is determined by the flow resistance to the cavities 31 and 32, it rises as the filling proceeds. In addition, the injection pressure increases as the filling speed increases. The pressure in the pressure holding process in the first section X1 is ph1. The pressure at the filling speed f21 at the beginning of the second section X2 is pf1.

In the present embodiment, after the pressure holding step in the first section X1 is completed, one valve body 81 is moved in the valve closing direction to close the material supply flow path to the first cavity 31. However, without closing the valve body 81 at the end the pressure holding process of the first section X1, since already the material in the first cavity 31 is filled in the S ₀ ~H1 controlling the speed, in the second interval X2 The material injected from the nozzle 55 will flow into the unfilled second cavity 32.

  Therefore, even if the material supply flow path to the first cavity 31 is opened and the second section X2 is moved, the generation of burrs can be prevented without applying an excessive force to the first cavity 31. By doing so, the pressure holding step other than the final section (second section X2 in this embodiment) is omitted, and the operation of closing the valve body 81 can also be omitted, so that the molding cycle can be shortened.

  The injection molding control of the present embodiment is particularly effective for small products, and can be applied to most products if there is no extremely thin portion at the end of the cavity. In the above embodiment, filling is performed from the first cavity 31 having a large injection mass, but conversely, filling may be performed from the second cavity 32 having a small injection mass.

  S1 in FIG. 3 is a switching point from the first section X1 to the second section X2, and indicates the target position of the injection plunger 52 when the control of the first section X1 ends. Therefore, when the actual position of the injection plunger 52 is detected by the sensor 61 at the end of the control in the first section X1, and the detected value is compared with the S1 point that is the target value of the controller 62, the deviation from the target operation in the injection process can be obtained. Can be detected.

  By issuing an alarm signal when this deviation deviates from the allowable value, for example, it is possible to perform processing for an abnormal time such as operating the display 63 and interrupting the injection operation. If there are a plurality of section switching points, it is possible to detect an abnormality in the injection operation by detecting this deviation at all the switching points and to interrupt the injection operation.

Next, a second embodiment of the molding method of the present invention will be described.
(A) in FIG. 4 shows another example of a control diagram applied when molding using the injection molding machine 10.
The horizontal axis in FIG. 4A represents the position of the injection plunger 52, and the vertical axis represents the filling speed. From S ₀ point to point S1 is a first section X1 of filling the material into the first cavity 31, until En point from the point S1 is a second interval X2 of filling the material into the second cavity 32. The first section X1 corresponds to the previous section referred to in the present invention. The second section X2 corresponds to the subsequent section referred to in the present invention. The speed is changed to f11, f12, and f13 in the first section X1, and the speed is changed to f21, f22, and f23 in the second section X2.

  The first section X1 is configured only by speed control that switches speed depending on the position of the injection plunger 52. That is, in the first section X1, the pressure control by the timer (pressure holding process) is not performed after the speed control ends. This point is different from the first embodiment. In the second section X2, after speed control is performed to switch the speed according to the position of the injection plunger 52, pressure control (pressure holding process) by a timer is performed. That is, the injection process is completed by combining speed control and pressure control (pressure-holding process) only in the final section among a plurality of sections time-divided in one injection process.

  As described above, in the second embodiment, the pressure holding process (pressure control) is omitted in the first section X1, and the pressure holding process (pressure) of all the cavities 31 and 32 is performed by the pressure control performed in the second section X2. Control). Therefore, after the control of the first section X1 is completed, when the control of the second section X2 is performed, the control of the second section X2 can be performed without closing the valve body 81 opened in the first section X1. . The rest is the same as in the first embodiment.

  In the second embodiment, the injection pressure changes as shown in FIG. Compared to FIG. 3B of the first embodiment, the pressure ph1 in the pressure holding process in the first section X1 is eliminated, and this is replaced with the pressure pf1 in the first filling process in the second section X2. Although pf1 decreases once, it increases immediately with the progress of filling, so the difference from the replaced ph1 is small and there is little influence of omitting the pressure holding step. Therefore, the purpose of the pressure-holding process, that is, the function of replenishing the material that is cooled and contracted and continuing to apply pressure until the gate is sealed can be achieved.

  The present invention can also be applied to a mold having three or more cavities. For example, by dividing the injection process into a plurality of sections according to three or more cavities, omitting the pressure holding process (pressure control) except for the control of the final section, and performing the pressure holding process only in the final section, The pressure-holding process for all cavities can be controlled collectively.

  In the present invention, a valve body is provided for each material supply flow path leading to each cavity, and at the beginning of the injection process, all of the valve bodies are filled and the material is filled. The material may be filled in each cavity by sequentially opening the valves in a predetermined order.

  In carrying out the present invention, the valve mechanism is not necessarily provided in the material supply channel to all the cavities. Because there are cavities with similar shapes and sizes among the multiple cavities, a valve mechanism is provided only in the material supply channel that leads to cavities with greatly different shapes and sizes, and the cavities with similar shapes and sizes are used. By not providing a valve mechanism, the object of the present invention can be achieved by using a minimum valve mechanism.

  In the embodiment, a plurality of types of cavities 31 and 32 are formed by one mold set 14. However, the present invention is not limited thereto, and the injection molding method of the present invention may be carried out using different cavities of a plurality of mold sets, for example.

Sectional drawing of the injection molding machine which concerns on one Embodiment of this invention. Sectional drawing which expands and shows a part of injection molding machine shown by FIG. The figure which shows an example of the control diagram of the injection molding machine shown by FIG. The figure which shows the other example of the control diagram of the injection molding machine shown by FIG. Sectional drawing of a part of conventional injection molding machine. The figure which shows an example of the position and filling speed of the injection plunger of the conventional injection molding machine. The figure which shows the other example of the position of the injection plunger of the conventional injection molding machine, and a filling speed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Injection molding machine 11 ... Injection apparatus 12 ... Fixed side metal mold 13 ... Movement side metal mold 14 ... Mold assembly 31, 32 ... Cavity 52 ... Injection plunger 62 ... Controller (control means)
70 ... runner (material supply flow path)
71, 72 ... Gate (material supply flow path)
80 ... Valve mechanism 81, 82 ... Valve body

Claims (12)

A plurality of mold sets having different cavities or one mold set having a plurality of different cavities;
An injection device capable of filling the plurality of cavities with material in a single injection step;
A valve mechanism including a plurality of valve bodies for opening and closing a material supply flow path leading to each of the plurality of cavities;
At the beginning of the injection process, the material is filled with all the valve bodies closed, and then the valve bodies are sequentially opened in a predetermined order to fill the material for each cavity. Control means for controlling the valve mechanism, wherein one cavity is formed in a section which is performed first after filling the material in a state where all the valve bodies are closed in one injection process of the injection device. materials subjected to injection the molding conditions corresponding to the valve and the cavity body is opened to the valve mechanism to supply to the said valve mechanism to supply the material to the other cavity in a section performed thereafter Control means for opening the valve body and performing injection under molding conditions according to the cavity;
An injection molding machine comprising: In the injection molding machine according to claim 1,
Of the plurality of sections, the section excluding the last section performs speed control for changing the speed at which the injection plunger is advanced in accordance with the position of the injection plunger of the injection device. A plurality of mold sets having different cavities or one mold set having a plurality of different cavities;
An injection device capable of filling the plurality of cavities with material in a single injection step ;
A valve mechanism for opening and closing a material supply flow path leading to at least one of the plurality of cavities;
In the first section of one injection process of the injection device, the valve mechanism is controlled to supply material to one specific cavity in the first section, and injection is performed under molding conditions corresponding to the cavity. And a control means for controlling the valve mechanism so as to supply the material to the other cavity and injecting under molding conditions corresponding to the cavity in the rear section performed
The control means controls the valve mechanism so as to open a material supply flow path leading to the specific cavity in the front section, and in the rear section, the material leading to the specific cavity until the rear section ends. An injection molding machine characterized in that the valve mechanism is controlled to open a material supply flow path leading to the other cavity with the supply flow path open. A plurality of mold sets having different cavities or one mold set having a plurality of different cavities;
An injection device capable of filling the plurality of cavities with material in a single injection step;
A valve mechanism for opening and closing a material supply flow path leading to at least one of the plurality of cavities;
In the first section of one injection process of the injection device, the valve mechanism is controlled so as to supply material to one specific cavity and injection is performed under molding conditions corresponding to the cavity. And a control means for controlling the valve mechanism so as to supply the material to the other cavity and injecting under molding conditions corresponding to the cavity in the rear section performed
The control means controls the valve mechanism to open the material supply flow path leading to the specific cavity in the front section, and shuts off the material supply flow path leading to the specific cavity in the rear section and The valve mechanism is controlled so as to open the material supply flow path leading to the other cavity, and the sections other than the last section among the plurality of sections are in accordance with the position of the injection plunger of the injection device. An injection molding machine that performs speed control to change a speed at which a plunger is advanced . In the injection molding machine according to claim 2 or 4,
The position of the injection plunger is detected at the boundary of the plurality of sections, and an abnormality is detected when a deviation between a detection signal indicating the actual position of the injection plunger and a signal for driving the injection plunger exceeds an allowable value. An injection molding machine characterized by outputting a signal to inform. In the injection molding machine according to claim 5,
An injection molding machine, wherein an injection operation of the injection device is stopped when a signal notifying the abnormality is output. A plurality of mold sets having different cavities or one mold set having a plurality of different cavities;
Using an injection molding machine having a valve mechanism with a plurality of valve bodies for opening and closing a material supply flow path leading to each of the plurality of cavities,
An injection molding method for molding a plurality of types of products in a single injection process,
Dividing the injection process into a plurality of sections according to the plurality of cavities;
At the beginning of the injection process, the material is filled with all the valve bodies closed, and then the material is supplied only to a specific cavity among the plurality of cavities in the previous section. In a state where the valve body of the valve mechanism is opened , the cavity is filled with a material based on molding conditions set according to the cavity,
In the rear section, which is performed after the previous section is finished, the valve body of the valve mechanism is opened so that the material is supplied to other cavities other than the specific cavity. An injection molding method comprising filling a material into the cavity based on molding conditions set in the above. In the injection molding method according to claim 7 ,
Of the sections divided into a plurality of sections, the sections other than the last section perform speed control for changing the speed at which the injection plunger is advanced according to the position of the injection plunger of the injection device. Method. A plurality of mold sets having different cavities or one mold set having a plurality of different cavities;
Using an injection molding machine having a valve mechanism that opens and closes a material supply flow path leading to at least one of the plurality of cavities,
An injection molding method for molding a plurality of types of products in a single injection process,
Dividing the injection process into a plurality of sections according to the plurality of cavities;
In the previous section performed at the beginning of the injection process, the valve mechanism is controlled to open a material supply flow path leading to the specific cavity so that the material is supplied only to the specific cavity among the plurality of cavities. And filling the cavity with material based on molding conditions set according to the specific cavity,
In the rear section, which is performed after the previous section is completed, the material is supplied to other cavities other than the specific cavity, with the material supply channel leading to the specific cavity being opened until the rear section is completed. In the state where the valve mechanism is controlled so as to open the material supply flow path leading to the other cavity, the material is filled into the cavity based on the molding conditions set according to the other cavity. An injection molding method characterized by the above. A plurality of mold sets having different cavities or one mold set having a plurality of different cavities;
Using an injection molding machine having a valve mechanism that opens and closes a material supply flow path leading to at least one of the plurality of cavities,
An injection molding method for molding a plurality of types of products in a single injection process,
Dividing the injection process into a plurality of sections according to the plurality of cavities;
In the preceding section performed at the beginning of the injection process, the valve mechanism is controlled so that only a specific cavity among the plurality of cavities is supplied, and based on molding conditions set according to the cavity. Filling the cavity with material,
In the rear section, which is performed after the previous section is completed, the molding conditions set according to the other cavities in a state where the valve mechanism is controlled so that the material is supplied to other cavities other than the specific cavity. Filling the cavity with material based on
In the front section, the valve mechanism is controlled so as to open the material supply flow path leading to the specific cavity, and in the rear section, the material supply flow path leading to the specific cavity is blocked and the other cavity is opened. The valve mechanism is controlled so as to open a material supply flow path, and the section excluding the last section among the sections divided into the plurality is divided into the injection plunger according to the position of the injection plunger of the injection device. An injection molding method characterized by performing speed control for changing a speed at which the ink is advanced. In the injection molding method according to claim 8 or 10 ,
When the position of the injection plunger is detected at the boundary between the plurality of sections, and a deviation between a detection signal indicating the actual position of the injection plunger and a signal for driving the injection plunger exceeds an allowable value An injection molding method characterized by outputting a signal notifying abnormality. In the injection molding method according to claim 11 ,
An injection molding method, wherein an injection operation of the injection device is stopped when a signal notifying the abnormality is output.

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