Nissei Plastic Industrial Co., Ltd.

Takashi Hakoda

Toshimi Kato

Kiyoshi Nakamura

Isamu Komamura

Hirofumi Murata

Susumu Morozumi

Michiaki Takizawa

Kazuo Usui

Fumio Shiozawa

Haruo Okada

Nobukazu Kasuga

Yoshiaki Kudo

Tetsuo Ikeda

Mitsuhiro Ogasawara

Chiharu Nishizawa

Kazuki Miyairi

Takashi Magario

Isamu Yamaguchi

Masahiko Miyajima

Yoshimoto Unno

Yoshitomi Uchikawa

Osamu Ichikawa

Hidenobu Yoda

Masaki Miyazaki

Yoshito Aruga

Takemi Uehara

Hitoshi Saitoh

Seiichi Sakurada

When an injection molding machine performs molding, the mold clamping force on the mold is adjusted on the basis of a mold displacement of the mold or the injection peak pressure and injection foremost position so that the molding is performed without causing flash and by an appropriate mold clamping force with which energy can be reduced. The amount of mold displacement and also the injection peak pressure and the injection foremost position are monitored during automatic operation. If there occurs no mold displacement change exceeding a threshold or if there occurs no injection peak pressure anomaly or injection foremost position anomaly exceeding thresholds, the automatic operation is continued. If the mold displacement change occurs or if the injection peak pressure anomaly and the injection foremost position anomaly occur, the operation of the injection molding machine is stopped.

Injection molding machine and flash prevention method

In performing molding by injecting and filling a resin by an injecting device with a predetermined injection pressure into a mold formed of a fixed mold and a movable mold clamped by a clamping device with a predetermined clamping force, at least a clamping device which enables natural compression of the resin with solidification of the resin in the mold is used as the clamping device, a molding injection pressure and a molding clamping force with which a predetermined mold gap is generated between the movable mold and the fixed mold in injection and filling and a non-defective product can be molded are acquired and set in advance, the clamping device is clamped with the molding clamping force during production, the molding injection pressure is set as a limit pressure, and after the resin is injected and filled in the mold by driving the injecting device.

Molding method of injection molding machine

When a waveform monitor apparatusof an injection molding machine M for monitoring an operation waveform at least during molding is configured by mounting the waveform monitor apparatuson the injection molding machine M for performing molding according to a specific molding system, a parting opening detecting means Fp for detecting change data of a parting opening Lm to a time during molding, and an operation waveform displaying means Fd for displaying at least change data from a resin filling start is into a moldto a cooling time termination to of the mold, detected by the parting opening detecting means Fp, on a waveform displaying portionof a screenon a displayattached to a molding machine controllerare provided.

Waveform monitor apparatus of injection molding machine

A predetermined speed control pattern B is sct. In a mold clamping process, in a mold closing section Zm, mold closing control is performed at a mold closing speed Vm, and based on a current mold closing speed Vd and a current mold closing position Xd, which are both detected, a deceleration starting position Xmc of the deceleration section Zmd, where the current mold closing speed Vd becomes a zero (O) at a virtual stop position Xc, is sequentially forecasted at each predetermined time interval by calculation. Upon reaching the deceleration starting position Xmc the deceleration section Zmd is started, and in the deceleration section Zmd, based on the detected current mold closing position Xd, a speed command value Dm corresponding to the speed control pattern B is obtained sequentially by calculation, and according to the speed command value Dm deceleration control is performed. Upon reaching a mold clamping-transition speed Vc, a predetermined mold clamping processing is performed via a low-pressure low-speed section Zc.

Method for controlling mold clamping device

A predetermined speed control pattern A is set. In controlling mold opening, in the mold opening section Zm, mold opening control is performed at the mold opening speed Vm, and based on a current mold opening speed Vd and a current mold opening position Xd, which are both detected, a deceleration starting position Xmc of the deceleration section Zmd where a current mold opening speed Vd becomes a zero (O) at a virtual stop position Xso is sequentially forecasted at each predetermined time interval by calculation. Upon reaching the deceleration starting position Xmc the deceleration section Zmd is started, and in the deceleration section Zmd, based on the detected current mold opening position Xd, a speed command value Dm corresponding to the speed control pattern A is obtained sequentially by calculation, and according to the speed command value Dm deceleration control is performed. Upon reaching a last-transition speed Vc, a predetermined stop controlling processing is performed.

An injection molding machineincludes mode selection meansthat can selectively switch between a first control mode Mand a second control mode M. In the first control mode M, control is performed by a first control system Cf in which a screw speed is controlled by feedback with a speed detection value Vd that is detected by screw speed detection meansand a speed target value Vfc, and an injection pressure is controlled by feedback with a pressure detection value Pid that is detected by injection pressure detection meansand a pressure target value Pic, whereas, in the second control mode M, control is performed by a second control system Cs in which the screw speed is open-loop controlled with a speed target value Vsc, and a pump pressure is controlled by feedback with a pressure detection value Ppd that is detected by pump pressure detection meansand that is related to the pump pressure of the hydraulic pumpand a pressure target value Ppc.

Injection molding machine and method of controlling the same

There are provided a first process Tin which a mold clamping motoris driven-controlled so as to move a cross headof a toggle link mechanismto a preliminary position Xr set in advance so as to become a position on the mold open side rather than a mold closure position Xs; a second process Tin which after the first process Tis finished, a mold thickness adjusting motoris driven-controlled so as to move a pressure receiving platenforward to a mold closed position Xc where a mold C is closed; a third process Tin which after the second process Tis finished, the mold clamping motoris driven-controlled so as to move the cross headforward, while the mold C is pressurized by torque limitation of the mold clamping motor, and the mold thickness adjusting motoris driven-controlled so as to move the pressure receiving platen, while the cross headis moved to the mold closure position Xs; and a fourth process Tin which, after the third process Tis finished, a clamping margin Lp of the mold C corresponding to a predetermined mold clamping force is set.

Method of adjusting mold thickness of toggle-type mold clamping device

Test molding is performed by sequentially clamping a moldwith a mold clamping force (100%, 80%, 70%, . . . ) obtained by sequentially lowering a mold clamping force by a predetermined amount from the maximum mold clamping force (100%); with mold position sensorsprovided on outer surfacesandof a fixed platensupporting a fixed moldof the moldand a movable platensupporting a movable moldof the mold, a relative position (mold position Xc) of the movable platenwith respect to the fixed platenin an injection process is detected; and, when at least a variation that meets predetermined conditions is produced on the mold position Xc, a mold clamping force obtained by increasing a mold clamping force at a time of occurrence of the variation by a predetermined amount is set as a proper mold clamping force Fs.

Method of setting mold clamping force of injection molding machine

When test molding is performed by sequentially clamping a mold with a mold clamping force (100%, 80%, 70%, . . .) obtained by sequentially lowering a mold clamping force by a predetermined amount from the maximum mold clamping force (100%), a mold clamping pressure Pc in an injection process is detected and a plurality of different monitored elements (Pc, Pcd and Per) corresponding to the variation of the mold clamping pressure Pc are monitored, and thus it is detected that at least one of the monitored elements is varied to exceed a predetermined threshold, a mold clamping force obtained by increasing a mold clamping force at the time of the production of the variation by a predetermined amount is set as a proper mold clamping force Fs.

A measurement control method uses an ending target position Xes calculated by adding a prescribed length Ls to a measurement ending position Xe. A rotation rate pattern Ar for rotating a screw, a back pressure Ps in relation to the screw, and a retraction rate pattern Ab for the screwto retract, are set in advance. The remaining rotation rate pattern Ar to stop the rotation of the screwat the ending target position Xes from the detected screw position X, is calculated at the time of measurement, and the rotation of the screwis stopped based on the calculation. Further, the remaining retraction rate pattern Ab is calculated from the detected retraction rate Vd, and the retraction of the screwis stopped based on the calculation. The result is the stopping of the screw at the measurement ending position Xe.

Measurement control method of an injection molding machine

When variation of mold clamping force to a mold C in production is detected and the mold clamping force is corrected on the basis of the detected variation, a work load accompanying high-pressure mold clamping of a mold clamping process is used as the variation, a work load as standard (standard work load Ws) accompanying high-pressure mold clamping is preset, the work load accompanying high-pressure mold clamping of the mold clamping process (detection work load Wd) is detected as variation in production, and the mold clamping force is corrected on the basis of a deviation Ke of standard work load Ws from this detection work load Wd.

Mold clamping force correction method for mold clamping apparatus

In a hydraulic drive device () for an injection molding machine (M) that has a pressure control valve (Vs) incorporating a pressure sensor () for detecting a hydraulic pressure and a feedback control circuit (Cs) for controlling the hydraulic pressure by feedback based on a pressure detection value (Spd) obtained from the pressure sensor () and a pressure instruction value (Spc) fed from a molding machine controller (), the molding machine controller () includes a second feedback control circuit (Cm) for correcting the pressure instruction value (Spc) that is fed to the pressure control valve (Vs) based on the pressure detection value (Spd) fed from the pressure control valve (Vs) and the pressure instruction value (Spci) obtained from the interior of the molding machine controller ().

Hydraulic drive device for injection molding machine

The present invention comprises a speed feedback control system for carrying out speed feedback control on the basis of a speed detected value Vd obtained by converting a position detected value Xd obtained from a screw position sensor, a pressure feedback control system for carrying out a pressure feedback control on the basis of a pressure detected value Pdb obtained from an injection pressure sensor, and a VP switching control function portion Fc for carrying out switching from a speed control region to a pressure control region Zp when a pressure deviation Ep between a preset pressure set value Ps and the pressure detected value Pdb becomes a preset switching determination value Eps or less and carrying out the switching to the pressure control region Zp after control of a speed command value in the speed control region Zv by a predetermined control pattern Dp at this switching.

Controller of injection molding machine

An ending target position Xes corresponding to the measurement ending position Xe, a rotation rate pattern Ar to rotate a screw, and a hypothetical retraction rate pattern Ab for the screwto retract are set in advance, the remaining rotation rate pattern Ar to stop the screwrotation at the ending target position Xes is predicated by calculation based on the screw position X detected at every specified time interval Ts at the time of measurement, based on which the screwis controlled to rotate to the measurement ending position Xe, the remaining retraction rate pattern Ab to stop the screwretraction at the ending target position Xe based on the screwretraction rate Vd detected at every specified time interval Ts, based on which the screwis controlled to retract to the measurement ending position Xe, the rotation and retraction of the screware stopped, and subsequently the screwis controlled to reverse rotate by a pre-set constant amount of rotation Rc while position controlling its position to the measurement ending position Xe.

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Nagano-ken, Japan

Takashi Hakoda