Nissei Plastic Industrial Co., Ltd.

Toshimi Kato

Takashi Hakoda

Fumio Shiozawa

Kiyoshi Nakamura

Kiyoto Takizawa

Haruo Okada

Isamu Komamura

Yuichi Sakurada

Masaki Miyazaki

Michiaki Takizawa

Yuji Hayashi

Hirofumi Murata

Takashi Magario

Minoru Yamazaki

Yoshimoto Unno

Keiichi Tozawa

Makoto Takeuchi

Masatake Hoshina

Hiroo Kudo

When a heating device is formed which includes at least one or more heatersandthat are provided on the outer circumferential surfacesandof at least one of a heating cylinderand an injection nozzleto heat at least one of the heating cylinderand the injection nozzle, at least some heaters, . . . of all the heaters, . . . are formed with air cooling-capable heatersandin which a panel memberformed of a material R having thermal conductivity is interposed between the heaters, . . . and the outer circumferential surfacesandof at least one of the heating cylinderand the injection nozzle, in which an air pathfor air cooling is formed in the panel memberand in which an air outlet and inlet portionallowing air A to be passed from an air supply portionis provided in the air path

Heating device of injection molding machine

An injection device has a heating cylinder, a nozzle adaptor attached to an end of the heating cylinder, a nozzle body attached to an end of the nozzle adaptor, a heater for heating the nozzle body, and a thermocouple for measuring a temperature of the nozzle body. The nozzle body has an outer peripheral surface and a key seat formed in the outer peripheral surface and extending in an axial direction of the nozzle body. The thermocouple includes a plate fitted in the key seat of the nozzle body.

Injection device having two-piece nozzle, jig for use in assembling two-piece nozzle, and method of assembling two-piece nozzle

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

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

In monitoring anomalies in a measurement process comprising a main measurement process Sa which performs a measurement by forward rotating a screwhaving a back-flow prevention valveinstalled on the tip and a post-measurement process which performs a post-measurement process Sb for closing said back-flow prevention valveafter this main measurement process Sa ends, after said post-measurement process Sb ends, an injection process Si wherein said screwis put in a freely-rotatable state and moved forward is performed, the amount of rotation Rd of said screwsince the start of this injection process Si is detected, and if the detected amount of rotation Rd exceeds at least a preset amount Rs, an anomaly processing (S) is performed.

Anomaly monitoring method of an injection molding machine

A measurement method including a main measurement process Sa in which measurement is performed by rotating a screw in the forward direction with a back-flow prevention valve installed on its tip and a post-measurement process Sb which is performed by rotating the screw in a reverse direction after the main measurement process Sa is finished, the post-measurement process Sb being performed after completing the main measurement process Sa, in which the screw is moved forward in a free rotational state, the rotational state of the screw during the forward movement being monitored, and if the rotation of screw comes to a halt, the screw is rotated in a reverse direction by a specified amount of rotation.

Measurement method for injection molding machines

A closure position detection mode is provided so as to obtain a rate of variation (which encompasses an amount of variation) in a physical quantity to a predetermined amount of movement of a movable platen or a crosshead, and detect, as a mold closure position, a position when the variation rate reaches a preset ratio. The mold clamping apparatus is previously operated in the closure position detection mode so as to store, as a reference value, the mold closure position at which a target mold clamping force is obtained. In production operation, the mold clamping apparatus is operated in the closure position detection mode so as to obtain an actual mold closure position (detection value). The mold clamping force is corrected on the basis of a deviation of the detection value from the reference value.

In a mold closure position detection method, a mold closure position is detected on the basis of a variation in a physical quantity because of closure of a mold. The method comprises detecting an amount of movement of a movable platen, or a crosshead in the case where the mold clamping apparatus is of a toggle type, during closure of the mold; detecting a variation in the physical quantity because of closure of the mold; obtaining a rate of variation (which encompasses an amount of variation) in the physical quantity to a predetermined amount of movement of the movable platen or the crosshead; and detecting, as a mold closure position, a position of the movable platen or the crosshead when the variation rate reaches a preset ratio.

Mold closure position detection method for mold clamping apparatus

There is provided a preplasticizing injection machine including a resin vent formed in the injection cylinder behind the plunger stroke wherein said resin vent is connected to a pressure reducing device and/or an inert gas feeding machine. The resin entrapped in the clearance prevents gases generated within the cylinder from being exhausted and it may be blackened due to the oxidation thereof. According to the present invention, these problems can be solved by the above construction. Furthermore, a band heater is provided on the outer surface of the cylinder behind the injection plunger stroke over the resin vent to prevent the entrapped resin from being solidified.

Preplasticizing injection machine

An injection molding machine equipped with an assembly for vibration processing which efficiently performs processing operations on the resin in the mold with vibration overcomes the restriction of vibration frequency due to the limited response of return springs and due to vibration transfer loss from the vibratory rods to the vibratory plate when operating at a high frequency. The injection molding machine performs both vibration and ejection without an ejector plate by making the vibratory plate serve a dual purpose and thus enable reduction in both mold size and production cost.

Injection molding machine having assembly for vibration processing

A penetration hole of plasticized resin is pierced in a screw head, so that the resin may be accumulated in uniform temperature distribution without sacrificing the function of the injection screw. More specifically, a penetration hole 15 of plasticized resin is pierced inside a screw head 13 at the front end of a screw 12 from the front middle to the rear periphery so as to communicate between the screw peripheral parts and the screw head front space. A ring valve 17 for opening and closing a rear opening 15a of the penetration hole 15, and closing the gap around the screw head is fitted to the rear periphery of the screw head 13 so as to be free to move back and forth.

Injection screw

A method of setting molding conditions for an injection molding machine 1 using a mold 2 whose specifications data are unclear included three setting processes. In the first setting process A, by inputting known data into controller 3, the molding conditions based on a data base prepared in advance and said input known data are set. In the second setting process B, injection molding is performed according to prescribed molding conditions pre-selected concerning injection pressure P, injection speed V and the injection start position of screw 4, and then, based on the product just molded, injection pressure P is altered, to set said altered injection pressure P, injection speed V and proper pre-feed measurement value Md as molding conditions. In the third setting process C, injection molding is performed according to molding conditions obtained from said second setting process B, and subsequently, taking into account the findings from the product just molded, said molding conditions are adjusted. In this manner, even an unskilled operator is allowed to undertake setting molding conditions reliably and with great ease for an injection molding machine loaded with a set of molds whose specifications data are unclear.

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Nagano-ken, Japan

Toshimi Kato