JP2014136323A - Control device for injection molding machine having function for controlling mold fastening force - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an injection molding machine having function for controlling mold fastening force, including an operation screen of an injection molding machine for condition settings for mold fastening, linked with condition settings for injecting, pressure keeping, measuring, and cooling, allowing for switching of mold fastening control based on the conditions set from the operation screen.SOLUTION: In a display screen 100 of an injection molding machine, a mold fastening control step is provided on the same screen for setting a target value of the mold fastening force for each screw controlling step in an injecting process (102), a pressure keeping process (104), a measuring process (106), and a cooling process (108). The control device of the injection molding machine performs a forming cycle by sequentially switching the mold fastening control steps linked with the corresponding switching conditions (112, 114, 116 and 118) for the respective screw controlling steps for injecting, pressure keeping, measuring, and cooling.

Description

  The present invention relates to a control device for an injection molding machine, and more particularly to a control device for an injection molding machine having a mold clamping force control function.

  As a mold clamping control of an injection molding machine, a control method is known in which a mold clamping force and a position of a mold clamping shaft are changed during an injection, pressure holding, measurement, and cooling process. By changing the clamping force during the injection / holding / metering / cooling process, the residual stress of the molded product can be reduced by, for example, decreasing the clamping force as the resin filled in the mold cools and solidifies. In addition, there is an effect of improving gas escape from the mold by lowering the mold clamping force in the initial stage of resin filling.

  When performing such mold clamping control, the operator sets conditions for mold clamping control such as mold clamping force and mold clamping force switching timing in consideration of injection, holding pressure, measurement, and cooling condition settings. For example, Patent Document 1 discloses a setting screen for sequentially changing the mold clamping force in accordance with the set value of the initial mold clamping force and the elapsed time after the initial mold clamping force is generated. FIG. 7 is a diagram for explaining a display screen for sequentially changing the mold clamping force in accordance with the elapsed time since the generation of the conventional initial mold clamping force.

JP 2008-126557 A

  However, since it is necessary to set conditions for such mold clamping control in consideration of injection / holding pressure / metering / cooling condition settings, it is difficult for the operator to work. In addition, when the injection, pressure holding, weighing, and cooling condition settings are changed, it is necessary to adjust the mold clamping control condition settings accordingly. It was a burden.

  Therefore, in view of the problems of the prior art described above, the present invention provides an operation screen of an injection molding machine capable of setting conditions for mold clamping control in conjunction with setting conditions for injection, pressure holding, weighing, and cooling, It is an object of the present invention to provide a control device for an injection molding machine that switches mold clamping control based on conditions set on an operation screen.

The invention according to claim 1 of the present application has at least one screw control partial process in each of the injection process, the pressure holding process, the metering process, and the cooling process, and controls the screw for each screw control partial process. A control unit for an injection molding machine that includes a screw control partial process setting unit that sets conditions and a switching condition for switching the screw control partial process, and switches the screw control condition according to the switching condition. At least one mold clamping control partial process corresponding to any one of the screw control partial processes of the metering process and the cooling process, and mold clamping control for setting the control conditions of the mold clamping control partial process Switch to the control conditions set by the mold clamping control partial process setting unit according to the switching conditions of the partial process setting unit and the screw control partial process Mold clamping control substeps switching unit, a control device for an injection molding machine and having a city.
The invention according to claim 2 is the control of an injection molding machine according to claim 1, wherein the mold clamping control partial process setting unit exists in the same screen as the corresponding screw control partial process setting unit. Device.

The invention according to claim 3 has at least one screw control partial process in each of the injection process, the pressure holding process, the metering process, and the cooling process, and a screw control condition for each screw control partial process, In the control device of the injection molding machine that includes a screw control partial process setting unit that sets a switching condition for switching the screw control partial process, and that switches the screw control condition according to the switching condition, at least one mold clamping control part A process, a mold clamping control partial process setting unit for setting control conditions of the mold clamping control partial process, and a switching of the mold clamping control partial process, a switching of a screw control partial process of injection / holding pressure / metering, and an injection start A switching condition setting unit that is arbitrarily selected and set from injection completion, pressure holding completion, weighing completion, and cooling completion, and is set by the switching condition setting unit. Mold clamping control substeps switching unit for switching the control condition set in the mold clamping control substeps setting unit according to establishment of the condition, the control apparatus for an injection molding machine and having a city.
According to a fourth aspect of the present invention, the switching condition setting unit sets the switching conditions of the mold clamping control partial process, switching of an injection / holding pressure / metering screw control partial process, injection start, injection completion, pressure holding completion, Arbitrarily selected from the completion of measurement and the completion of cooling and set the delay time respectively, the mold clamping control partial process switching unit, the mold according to the establishment of the conditions set in the switching condition setting unit and expiration of the delay time 4. The control apparatus for an injection molding machine according to claim 3, wherein the control conditions are switched to the control conditions set by the tightening control partial process setting unit.

  According to the present invention, the mold clamping control condition setting can be performed in conjunction with the injection / holding pressure / metering / cooling condition setting, so that the mold clamping control partial process switching is performed separately from the switching timing of the screw control partial process. There is an effect that the work of setting the timing becomes unnecessary and the burden on the operator is reduced. In addition, even if the injection, pressure holding, metering, and cooling conditions are changed, the mold clamping control is automatically switched so that the burden on the operator for adjusting the mold clamping control condition setting can be reduced. Play.

It is a figure explaining the injection molding machine which enforces this invention. It is a figure explaining the display screen (clamping force setting) of Embodiment 1. FIG. It is a figure explaining the display screen (pattern board position setting) of Embodiment 1. FIG. It is a figure explaining the mold clamping control partial process of Embodiment 1. FIG. 10 is a diagram illustrating a display screen according to Embodiment 2. FIG. It is a figure explaining the mold clamping control partial process of Embodiment 2. FIG. It is a figure explaining the conventional display screen (The switching of a screw control partial process and the switching of a mold clamping control partial process are non-interlocking).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view for explaining an injection molding machine for carrying out the present invention. The injection molding machine generally includes an injection molding machine main body 1 in which an injection part and a mold clamping part are arranged on a base, and a control device 2 that controls the entire injection molding machine.

  The control device 2 includes a CPU 3 that is a processor, an input / output circuit 4, an input / output circuit 4 that is connected to the CPU 3 via a bus 9, a ROM 5, a RAM 6, a nonvolatile memory 7, and an LCD / MDI 8. The input / output circuit 4 includes a servo motor that drives the mold clamping unit of the injection molding machine, a servo motor that drives the ejector, a servo motor that rotates the screw, a servo motor that drives the screw in the axial direction, and a rotational position of each servo motor. Various sensors such as a position detector for detecting are connected.

  The ROM 5 stores a control program for controlling the entire injection molding machine. In the embodiment of the present invention, the operation screen of the injection molding machine and the conditions set on the operation screen are stored in the nonvolatile memory 7, and the mold clamping control is enabled based on the conditions set on the operation screen. A program is also stored in the ROM 5. The RAM 6 is used for temporary storage of data. The nonvolatile memory 7 stores screen setting data and NC programs according to the present invention. The LCD / MDI 8 inputs molding conditions and various commands and displays them on an LCD (Liquid Crystal Display).

  The injection molding machine executes a mold closing process, an injection / holding process, a metering process, a cooling process, a mold opening process, and an ejecting process (ejecting process) in one cycle of product molding. The injection molding machine is equipped with a display, and on this display, various operation condition setting screens for setting and checking operation conditions for automatic operation, and various actual measurement data for displaying actual measurement data during automatic operation. The display screen is displayed.

  In the present invention, in each of the injection process, the pressure holding process, the metering process, and the cooling process, each process divided by switching the control stage is referred to as a screw control partial process. In the mold clamping control process, each process divided by switching the control stage is referred to as a mold clamping control partial process. The screw control partial process may be a control partial process in an injection / holding / metering / cooling process using a screw, or in the case of a pre-plastic injection molding machine, a control in an injection / holding / metering / cooling process using a plunger. It may be a partial process.

<Embodiment 1>
In the first embodiment of the present invention, each mold clamping control partial process for setting a target value of the mold clamping force is provided for each screw control partial process of the injection, pressure holding, metering, and cooling process. -It is characterized by sequentially switching the corresponding mold clamping control partial processes in conjunction with the switching of each screw control partial process of metering and cooling. At this time, it is desirable that the setting part of the mold clamping control partial process exists in the same screen as the setting part of the screw control partial process.

  FIG. 2 is a diagram for explaining a display screen (in the case of mold clamping force setting) according to the first embodiment. In the display screen 100 that is an operation screen, each of the injection process, the pressure holding process, the measurement process, and the cooling process has one or more screw control partial processes, and the physical quantity in each screw control partial process can be set. it can. The injection process includes a screw control partial process in which the injection speed 102 is switched by three control stages of a first stage (1st), a second stage (2nd), and a third stage (3rd). The pressure-holding process includes a screw control partial process that switches the pressure-holding pressure 104 in three control stages of a first stage (1st), a second stage (2nd), and a third stage (3rd). The metering process includes a screw control partial process in which the metering back pressure 106 is performed in one (1st) control stage. The cooling process is configured as one screw control partial process of the cooling 108.

  In the display screen 100, it is possible to set a switching condition for switching the screw control partial processes of the injection process, the pressure holding process, the weighing process, and the cooling process. A switching condition for switching the injection speed 102 including the three screw control partial processes of the injection process can be set as the switching position 112 corresponding to the three screw control partial processes. A switching condition for switching the holding pressure 104 including the three screw control partial processes of the pressure holding process can be set as the switching time 114 corresponding to the three screw control partial processes. A switching condition for switching the weighing back pressure 106 including one screw control partial process of the measuring process can be set as the measuring position 116 corresponding to one screw control partial process. A switching condition for switching one screw control partial process of the cooling 108 in the cooling process can be set as the cooling time 118.

  Further, on the display screen 100, the screw control partial process of any of the screw control partial processes of the injection process (injection speed 102), the pressure holding process (pressure holding pressure 104), the metering process (metering back pressure 106), and the cooling process. It is possible to set one or more mold clamping control partial processes corresponding to the above and control conditions for the mold clamping control partial processes.

  On the display screen 100, the control conditions of the mold clamping control partial process are set as mold clamping forces 122, 124, 126, and 128. The mold clamping force 122 is set corresponding to the three screw control partial processes of the injection speed 102 in the injection process. The mold clamping force 124 is set corresponding to the three screw control partial processes of the holding pressure 104 of the holding process. The mold clamping force 126 is set corresponding to one screw control partial process of the measuring process. A mold clamping force 128 is set corresponding to one screw control partial process of the cooling process.

  A physical quantity that is a control condition of one or more screw control sub-processes in each of the injection process, the pressure holding process, the metering process, and the cooling process set on the display screen 100 and the screw control sub-process is switched. The physical quantity that is the switching condition and the physical quantity that is the control condition of one or more mold clamping control partial processes corresponding to any of the screw control partial processes are stored in a storage device in the control apparatus that controls the injection molding machine. The The control device of the injection molding machine executes the injection molding cycle by switching to the control conditions of the mold clamping control partial process according to the switching conditions of the screw control partial process stored in the storage device.

  FIG. 3 is a diagram for explaining a display screen (in the case of setting a platen position) according to the first embodiment. In the display screen 200 which is an operation screen, each of the injection process, the pressure holding process, the weighing process, and the cooling process has one or more screw control partial processes, and the physical quantity in each screw control partial process can be set. it can.

  On the display screen 200, the control conditions of the mold clamping control partial process are set as the mold platen positions 222, 224, 226, and 228. A mold platen position 222 is set corresponding to the three screw control partial processes of the injection speed 202 of the injection process. The mold platen position 224 is set corresponding to the three screw control partial processes of the holding pressure 204 in the holding process. The platen position 226 is set corresponding to one screw control partial process of the weighing back pressure 206 of the weighing process. A mold platen position 228 is set corresponding to one screw control partial process of the cooling process.

  FIG. 4 is a diagram illustrating a mold clamping control partial process according to the first embodiment. The control device of the injection molding machine switches to the control conditions set by the mold clamping control partial process setting unit according to the screw control partial process switching conditions set on the display screen 100 or the display screen 200, and executes the molding cycle. Can do.

<Embodiment 2>
In the second embodiment of the present invention, a mold clamping control part process for setting a target value of the mold clamping force is provided, and the switching conditions of the mold clamping control part process are set as injection, pressure holding, metering, and cooling screw control parts. The process is selected from the following conditions: process switching, injection start, injection completion, pressure holding completion, weighing completion, and cooling completion, and the mold clamping control partial process is sequentially switched in conjunction with the establishment of the selected condition. . At this time, a delay time is set according to the establishment of the switching condition of the mold clamping control partial process, and the mold clamping control partial process is sequentially performed in conjunction with the establishment of the switching condition of the mold clamping control partial process and the expiration of the delay time. You may make it switch.

  FIG. 5 is a diagram for explaining a display screen according to the second embodiment. In the display screen 300, each of the injection process, the pressure holding process, the metering process, and the cooling process has one or more screw control partial processes, and a physical quantity in each screw control partial process can be set. The injection process includes a screw control partial process in which the injection speed 302 is switched in three control stages of a first stage (1st), a third stage (2nd), and a third stage (3rd). The pressure-holding process includes a screw control partial process that switches the pressure-holding pressure 304 in three control stages of a first stage (1st), a second stage (2nd), and a third stage (3rd). The metering process includes a screw control partial process in which the metering back pressure 306 is performed in one stage (1st) control stage. The cooling process is configured as one screw control partial process of the cooling 308.

  In the display screen 300, a switching condition for switching the screw control partial process of each of the injection process, the pressure holding process, the metering process, and the cooling process can be set. A switching condition for switching the injection speed 302 including the three screw control partial processes of the injection process can be set as the switching position 312 corresponding to the three screw control partial processes. A switching condition for switching the holding pressure 304 including the three screw control partial processes of the pressure holding process can be set as the switching time 314 corresponding to the three screw control partial processes. A switching condition for switching the weighing back pressure 306 including one screw control partial process of the weighing process can be set as the weighing position 316 corresponding to one screw control partial process. A switching condition for switching one screw control partial process of the cooling 308 of the cooling process can be set as the cooling time 318.

In the display screen 300, a mold clamping control partial process for setting a target value of the mold clamping force is provided, and the switching condition of the mold clamping control partial process is switched between the screw control partial processes of injection / holding pressure / metering / cooling, injection It can be arbitrarily selected from the conditions of start, injection completion, pressure holding completion, metering completion, and cooling completion. At this time, a delay time is set in accordance with the establishment of the switching condition of the mold clamping control partial process, and the mold clamping control partial process is sequentially performed in conjunction with the establishment of the switching condition of the mold clamping control partial process and the expiration of the delay time. You may make it switch.
The setting of the mold clamping control partial process may exist in the same display screen as the setting of the corresponding screw control partial process, or may be a separate screen.

  On the display screen 300, as the mold clamping force 322, the first stage (1st), the second stage (2nd), the third stage (3rd), the fourth stage (4th), the fifth stage (5th), and the sixth stage (6th) are controlled. A partial process is provided. Then, the second stage (2nd) of the injection speed 302 is completed in the switching condition 324 between the first stage (1st) and the second stage (2nd) of the mold clamping force, and the second stage (2nd) and the third stage (3rd) of the mold clamping force are switched. Condition 324 completes injection, mold clamping force 3rd stage (3rd) and 4th stage (4th) switching condition 324 2nd stage of holding pressure 304 (2rd) completed, mold clamping force 4th stage (4th) and 5th stage Completion of measurement is selected as the switching condition 324 of (5th), and completion of cooling is selected as the switching condition of the fifth stage (5th) and the sixth stage (6th) of the mold clamping force. Further, a delay time 326 is set in accordance with the satisfaction of the injection completion switching condition 324 and the measurement completion switching condition 324, respectively.

  FIG. 6 is a diagram illustrating a mold clamping control partial process according to the second embodiment. The control device of the injection molding machine can switch to the control conditions set by the mold clamping control partial process setting unit in accordance with the screw control partial process switching conditions set on the display screen 300 and execute the molding cycle. In the display screen 300, a delay time is set according to the establishment of the switching condition of the mold clamping control partial process, and the mold clamping control is interlocked with the establishment of the switching condition of the mold clamping control partial process and the expiration of the delay time. Partial processes are switched sequentially.

(Setting method of mold clamping control partial process)
As a setting method of the mold clamping control partial process, a mold clamping force may be set (see FIGS. 2 and 5), or a ratio of the mold clamping mechanism to the maximum mold clamping force may be set. Further, a mold platen position corresponding to a necessary mold clamping force may be set (see FIG. 3). When the mold clamping mechanism is a toggle link type, a crosshead position of the toggle mechanism corresponding to a necessary mold clamping force may be set.

DESCRIPTION OF SYMBOLS 1 Injection molding machine main body 2 Control apparatus 3 CPU
4 I / O circuit 5 ROM
6 RAM
7 Nonvolatile memory 8 LCD / MDI
9 Bus

100 Display Screen 102 Injection Speed 104 Holding Pressure 106 Weighing Back Pressure 108 Cooling 112 Switching Position 114 Switching Time 116 Measuring Position 118 Cooling Time 122, 124, 126, 128 Mold Clamping Force

200 Display Screen 202 Injection Speed 204 Holding Pressure 206 Weighing Back Pressure 208 Cooling 212 Switching Position 214 Switching Time 216 Weighing Position 218 Cooling Time 222, 224, 226, 228 Platen Position

300 Display screen 302 Injection speed 304 Holding pressure 306 Measuring back pressure 308 Cooling 312 Switching position 314 Switching time 316 Measuring position 318 Cooling time 324 Switching condition 326 Delay time

Claims (4)

Each of the injection process, the pressure holding process, the metering process, and the cooling process has at least one screw control partial process, and the screw control partial process for each screw control partial process and the screw control partial process are switched. In a control device for an injection molding machine that includes a screw control partial process setting unit for setting a switching condition for switching the screw control condition according to the switching condition,
At least one mold clamping control partial process corresponding to any one of the screw control partial processes of the injection process, pressure holding process, metering process, and cooling process, and control of the mold clamping control partial process Mold clamping control partial process setting unit for setting conditions;
A mold clamping control partial process switching unit that switches to the control conditions set by the mold clamping control partial process setting unit according to the switching conditions of the screw control partial process,
And a control apparatus for an injection molding machine.   2. The control device for an injection molding machine according to claim 1, wherein the mold clamping control partial process setting unit exists in the same screen as the corresponding screw control partial process setting unit. Each of the injection process, the pressure holding process, the metering process, and the cooling process has at least one screw control partial process, and the screw control partial process for each screw control partial process and the screw control partial process are switched. In a control device for an injection molding machine that includes a screw control partial process setting unit for setting a switching condition for switching the screw control condition according to the switching condition,
At least one mold clamping control partial process, a mold clamping control partial process setting unit for setting control conditions for the mold clamping control partial process, and switching of the mold clamping control partial process are performed for injection, pressure holding, and metering. A switching condition setting unit that is arbitrarily selected and set from screw control partial process switching, injection start, injection completion, holding pressure completion, metering completion, and cooling completion, and the conditions set in the switching condition setting unit are satisfied And a mold clamping control partial process switching unit that switches to the control conditions set by the mold clamping control partial process setting unit.   The switching condition setting unit can arbitrarily set a switching condition of the mold clamping control partial process from switching of injection / holding / metering screw control partial processes, injection start, injection completion, pressure holding completion, measurement completion, and cooling completion. The mold clamping control partial process switching unit is set by the mold clamping control partial process setting unit according to the establishment of the conditions set by the switching condition setting unit and the expiration of the delay time. 4. The control device for an injection molding machine according to claim 3, wherein the control conditions are switched to the controlled conditions.

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