Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/76—Measuring, controlling or regulating
  • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
  • B29C45/50—Axially movable screw
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/57—Exerting after-pressure on the moulding material

Definitions

• the present invention relates to an injection molding machine, and more particularly, to an injection control method and an injection control device for an injection molding machine that control the emission of the injection molding machine by a numerical controller.
• FIGS There are two control methods for injection control in an injection molding machine, as shown in FIGS. That is, as shown in Fig. 4, the speed is controlled from the injection start position, and when the screw reaches the pressure holding switching position, the pressure is switched to the pressure holding control. As shown in Fig. 5, the system shifts to the lock mode, and performs injection control for a predetermined time from the start of injection, switches to pressure-holding control when the predetermined time has elapsed, and when the pressure-holding time elapses There is a method to shift to the next weighing block.
• an injection molding machine is controlled by a numerical control device (hereinafter referred to as an NC device)
• the control is not performed by the method of FIG. 5 but by the method shown in FIG.
• the time required for executing the injection cycle becomes longer, which reduces the production efficiency and also causes the command output as a speed command to Since the re-start does not follow, the error between the movement command and the actual screw position is accumulated in the error register in the NC unit, and this value is a fixed amount.
• the NC device stops the pulse distribution, which may cause the entire injection molding machine to stop unintentionally.
• An object of the present invention is to improve the above-mentioned disadvantages of the prior art when performing injection control of an injection molding machine using an NC device, and to control the injection control according to the time from the start of injection. This is what you get.
• the injection when an injection command is input, the injection is performed while controlling the injection speed by the injection speed control means, and a predetermined time after the start of the injection.
• the holding pressure control means performs the holding pressure control, and after the start of the holding pressure control.
• the second timer that has passed for a predetermined period of time is started, and the second timer is timed up, the screw position is maintained until the screw pressure position reaches the pressure holding completion position.
• the follow-up means performs follow-up so that the value of the error register accumulated by the pulse distribution becomes zero.
• the injection control can be controlled according to time, so that the injection cycle becomes constant. Also, for some reason, the drive source's servo motor, which causes injection, cannot inject the resin at the set speed, and the screw does not reach the dwell position. Even if the first timer is timed up, it switches to the pressure-holding control and activates the second timer, so that the second timer is timed up. To Pulse distribution is performed until the screw reaches the pressure-holding completion position apparently, and follow-up is performed, so that the movement command block in the injection and pressure-holding commands is blocked. When the pulse distribution of the heat is completed, the NC unit can proceed to the next weighing cycle, and can operate efficiently without stopping the entire injection molding machine. it can .
• FIG. 1 is a block diagram of a main part of an embodiment of the present invention
• FIG. 2 is a flowchart of an operation processing of the embodiment
• FIG. 3 is a block diagram of the embodiment
• FIG. 1 is a block diagram of a main part of an embodiment of the present invention, wherein 1 is an NC device, M is an injection shaft of an injection molding machine, that is, a sock.
• the servo motor is used to drive the barrel in the axial direction to perform injection.
• the servo motor M detects the position and speed of the screw.
• a position detector P is provided.
• the NC device 1 has a micro processor (hereinafter referred to as a CPU) 2 for NC and a CPU 3 for a program controller (hereinafter referred to as a PC).
• the PC CPU 3 is connected to R0M5, which stores the sequence program of the injection molding machine, and the NC CPU 2 is connected to the injection molding machine as a whole.
• An R0M 7 storing a control program to be controlled and a servo control circuit 9 for driving and controlling the servomotor M are connected via a serpointer face 8.
• the output of the servo control circuit 9 is amplified by the amplifier ⁇ 2 to drive the thermomotor M.
• the serpentine I-Is 8 also includes a servo control circuit for the clamp motor that drives the mold clamping mechanism and the servo motor for the measuring shaft that rotates the screw.
• FIG. 7 shows a servo control circuit 9 and a servo motor M only for the injection axis.
• Reference numeral 6 denotes a non-volatile RAM having a backup power supply for storing a program for controlling each operation of the injection molding machine, various set values, parameters, and the like.
• Reference numeral 1 denotes a manual data input device (hereinafter referred to as CRT / DI) with a CRT display device, and a pass-by-bit controller (hereinafter referred to as a CRT / DI) via an interface 10.
• CTR / DI manual data input device
• CRT / DI pass-by-bit controller
• NC CPU 2 is inactive via BAC 4.
• the injection speed control program stored in the spontaneous RAM 6 is read out, and according to the program, the injection speed is controlled, and pulse distribution is performed according to the injection speed of each stage.
• CPU 2 sends a pulse distribution start signal to PC CPU 3 via BAC 4 and an M1 code indicating that an injection speed control block is being executed. And writes it to the nonvolatile RAM 6.
• the PC CPU 3 reads the pulse distribution start signal from the non-volatile RAM 6 and detects the pulse distribution start signal, the PC CPU 3 starts the injection timing timer T 1 for measuring the injection speed control time.
• the injection sequence is started in response to the detection of the M1 code (step S1).
• the CPU 3 for the PC determines whether or not the above-mentioned injection timer T1 has timed up (step S2), and for the NC. It is determined whether a signal indicating that the pulse distribution from the CPU 2 to the holding pressure switching point is completed has been transmitted (step S3).
• the NC CPU 2 completes the pulse distribution up to the pressure holding switching point before the injection high-speed timer times up, and sends the pulse distribution completion signal to the non-volatile RAM.
• the CPU 3 for PC reads this signal from the nonvolatile RAM 6 via the BAC 4 and ends the M1 code indicating the completion of the injection speed control block.
• the signal FIN is transmitted and written to the nonvolatile RAM 6 (step S4).
• the NC CPU 2 reads the M1 code end signal from the nonvolatile RAM 6 and controls the pressure-holding control block stored in the nonvolatile RAM 6.
• the program is read, pressure control is started based on the program, and the M2 code indicating that the pressure control block has been entered is written to the nonvolatile RAM 6.
• the PG CPU 3 confirms the M2 code and starts the holding pressure timer T 2 to correspond to the set holding pressure stored in the nonvolatile RAM 6.
• the torque limit value is sent out, and the output torque of the thermomotor M is driven to a value corresponding to the torque limit value via the CPU 2 for NC.
• the holding pressure control is performed so that the set holding pressure is applied to the resin (Step S5).
• the CPU 2 for NC performs a pulse distribution for the holding pressure control, and When the pulse distribution is completed, a second pulse distribution completion signal is transmitted.
• the CPU 3 for the PC determines whether or not the holding pressure timer T2 has timed up (step S6), and determines that the time has been up.
• the CPU 3 for PC judges whether the pulse distribution completion signal for the holding pressure from the CPU 2 for NG has been written into the nonvolatile RAM 6 (step S7), and When it is determined that the second pulse distribution completion signal is being sent from the CPU 2 for NC, it is determined that the pressure-holding control block has been completed, and the M2 code end signal FIN is not generated. The data is sent to the CPU 2 for NC via the RAM 6 (step S8). When the CPU 2 for NC receives this M2 code end signal, it starts a weighing cycle which is the next block of the pressure-holding block.
• step S2 the path from the CPU 2 for NC to the holding pressure control switching position in the emission speed control block is set.
• the CPU 3 for PC starts the dwelling operation sequence when the L: time-out timer T1 times out.
• the torque of the thermomotor M is limited by the torque limit value corresponding to the holding pressure set in the nonvolatile RAM 6 while the motor is stopped.
• the holding pressure timer T2 is started (step S9). That is, for some reason, the screw does not reach the holding pressure switching position within the normal required injection time set by the injection timer T1. In such a case, when the set time is up, the pressure is forcibly switched to the holding pressure control.
• the CPU 3 for PC determines whether the pulse distribution completion signal indicating that the pulse distribution to the holding pressure switching position by the CPU 2 for NC has been completed has been transmitted from CPU 2. (Step S10), and whether or not the holding pressure timer T2 has timed up is determined (Step S11), and the holding pressure switching position is determined. If the holding pressure timer T2 times out before the signal indicating the completion of the pulse distribution is detected, the screw moves to the holding pressure switching position. If the holding timer T 2 times out before the pressure reaches the CPU, the PC CPU 3 starts the follow-up function of the numerical controller 1. In both cases, it turns on the drain function of the device 1 and starts (turns on) the rabbit feed-rate output operation (step S12).
• the CPU 2 for the NC receives the speed command value in the servo control circuit 9 and the signal from the position detector P provided in the servomotor M.
• the value of the error register that memorizes the difference is read out, a pulse output is issued so that the value becomes zero, the follow-up is performed, and the dry run signal is turned on.
• the remaining distribution pulses are output to the error register at the speed set by the rapid * feed rate, and the screw position is set.
• the pulse distribution is forcibly performed even if the pulse pressure has not reached the pressure holding switching point. (Forced pulse distribution is performed only if the pulse distribution of the block is completed. This is because we will not proceed to the block of the above).
• the pulse distribution is forcibly performed, and the pulse distribution to the pressure holding switching position is performed regardless of whether the screw position moves to the pressure holding switching position, and Follow up and set the value of the error register to the bottom, that is, as if the screw had reached the holding pressure switching position.
• the error register does not exceed a predetermined value, and the entire injection molding machine is not stopped.
• the CPU 3 for the PC detects that the follow-up signal of the M1 block (injection speed control block) has been transmitted from the CPU 2 for the NC. (Step S13), and sends an M ⁇ code end signal (Step S14)
• the CPU 2 for NC starts executing the M2 block (holding control block), and the execution of the block is also started.
• the follow-up completion signal of the M2 block from the CPU 2 for NC is input to the CPU 3 for PC.
• the CPU 3 controls the follow-up function, the drain-run function, and the rapid feed-out output operation of the numerical controller 1 respectively.
• the M2 block (holding pressure control block) end signal FIN is sent to the NC CPU 2 (step S17). NC CPU 2 receives this end signal FIN and shifts to the next weighing cycle.
• step S10 the pressure holding switching position is switched to the pressure holding switching position before the pressure holding timer T2, which is started after switching to the pressure holding control, times up.
• the completion signal indicating the completion of the pulse distribution is input from the CPU 2 for NC to the CPU 3 for PC
• the CPU 3 for PC outputs a code end signal to the CPU 2 for NC (state).
• the CPU 2 for NC starts the control of the holding block and outputs the M2 code to the CPU 3 for PC indicating that the holding pressure is being controlled.
• the PC CPU 3 confirms the M2 code, it starts controlling the sequence of the dwelling operation, and is stored in the non-volatile RAM 6 and corresponds to the set dwelling pressure.
• step S19 the holding pressure control is performed.
• the CPU 3 determines whether or not the holding pressure timer T2 has timed up (step S20), and then the timer T2 sets the time. If it is determined that the step has been performed, the CPU CPU 2 for NC sends a pulse distribution completion signal in the holding pressure block. is determined (step S21), and if it is determined that the signal is being transmitted, an M2 code (holding pressure control) end signal is transmitted to the CPU 2 for NC. Move to the next weighing cycle.
• step S21 if it is determined in step S21 that the pulse distribution completion signal has not been detected despite the fact that the holding pressure timer T2 has timed up, it is determined that the pulse distribution completion signal is not detected. That is, when the pulse distribution in the holding pressure is not completed, the step S12 and the peripheral follow-up function, the dry run function, and the rabbit feed rate are performed. The output operation is turned on, pulse distribution is forcibly performed, and the value of the error register is set to zero by following up (step S23). Thereafter, the processing in steps S15 to S17 is performed.
• step S7 that is, while the injection speed control is completed, the operation proceeds to the pressure holding block, and the pressure holding timer T2 is being controlled. If the pulse distribution in the holding pressure has not been completed even after the timer has timed up, the above-described processing in step S23 and below is performed, and the holding pressure control is forcibly performed. Is completed, and the operation proceeds to the next weighing cycle.
• the switching from the injection speed control to the pressure holding control and the switching from the pressure holding control to the measuring cycle are switched depending on the screw position or time.
• the method of detecting the screw position and switching to pressure holding or weighing has been deleted, and switching to pressure holding or weighing only based on time has been eliminated. You may.
• steps S3 to S8 and steps S10 and S18 and steps S18 to S18 are performed.
• the processing of S2 3 is not required, and the process proceeds from step S1 to step S2. In step S2, until the timer T1 times out.
• step s9 the process proceeds to step s9, and then proceeds to step S11 from step S9, and waits until the holding pressure timer T2 times out. . Then, when the holding pressure timer T2 has timed up, the processing from step S12 to step S17 may be performed.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

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Publications (1)

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• 1985
  • 1985-11-29 JP JP60267512A patent/JPS62127221A/ja active Granted
• 1986
  • 1986-11-29 KR KR1019870700629A patent/KR940011359B1/ko not_active Expired - Fee Related
  • 1986-11-29 US US07/086,143 patent/US4816196A/en not_active Expired - Fee Related
  • 1986-11-29 DE DE8686906956T patent/DE3677381D1/de not_active Expired - Lifetime
  • 1986-11-29 EP EP86906956A patent/EP0247207B1/en not_active Expired - Lifetime
  • 1986-11-29 WO PCT/JP1986/000611 patent/WO1987003247A1/ja not_active Ceased

Patent Citations (1)

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