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Nozzle contact control device of injection molding machine

A control device and injection molding machine technology, which is applied in the field of nozzle contact control devices of injection molding machines, can solve the problems of no disclosure and too late for evasive actions, and achieve reliable protection and small hysteresis

Active Publication Date: 2015-06-24
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these prior arts, there is no disclosure of any countermeasures for the protection of the mechanism part assuming that an excessive load is applied to the injection unit due to the mold clamping operation.
[0009] On the other hand, in Japanese Patent Application Laid-Open No. 2006-27248, a technology for detecting the amount of deformation of an elastic member, rotating a motor, or releasing a brake is disclosed. action, and when the load suddenly increases rapidly like the mold clamping action, there is a problem that the evasive action is too late

Method used

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  • Nozzle contact control device of injection molding machine
  • Nozzle contact control device of injection molding machine

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Embodiment Construction

[0015] First, use figure 1 The block diagram of FIG. 1 illustrates one embodiment of the nozzle contact control device of the injection molding machine of the present invention.

[0016] The injection molding machine M is composed of a chassis Mb, a clamping unit Mc placed on the chassis Mb, and an injection unit Mi. The injection part Mi heats and melts the resin material (powder), and injects the molten resin into the cavity of the mold 31 . The mold clamping part Mc mainly performs opening and closing of the mold 31 (movable side mold 31a, fixed side mold 31b).

[0017] The injection part Mi is composed of an injection cylinder 1 , a nozzle 2 attached to the front end of the injection cylinder 1 , and a screw 3 inserted into the injection cylinder 1 . The screw 3 is provided with a resin pressure sensor 5 using a load cell for detecting resin pressure from the pressure applied to the screw 3 . The output signal (resin pressure sensor output signal) from the resin pressur...

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Abstract

The control device has a servomotor (M3) that controls forward and backward movements of nozzle (2) pressing on injection mold (31). A transmission unit (7) converts rotational movement of servomotor into linear movement. A spring (35) generates pressure force of nozzle. A CPU (15) positions motor at location where spring is compressed according to preset contact pressure of nozzle. A limiter limits torque of servomotor to limit value that is greater than preset pressing force of nozzle and smaller than pressing force of nozzle, during maximum compression of spring.

Description

technical field [0001] The present invention relates to a control device that uses a servo motor to make a nozzle installed at the front end of an injection cylinder contact a mold (nozzle contact) to generate a predetermined nozzle contact force in an injection molding machine. Background technique [0002] The nozzle installed on the front end of the injection cylinder of the injection unit of the injection molding machine is converted into a linear motion by a transmission mechanism such as a ball screw through a servo motor for moving the nozzle fixed on the base of the injection molding machine body forward and backward. Thereby carry out forward and backward action. In the nozzle forward movement, the nozzle is advanced by the servo motor for the nozzle forward and backward. After the nozzle is contacted, the motor for the nozzle forward and backward is also activated to compress the elastic member between the above-mentioned transmission mechanism and the injection un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76B29C45/20
CPCB29C45/20B29C45/76B29C45/80B29C2045/202B29C2945/76006B29C2945/7618B29C2945/76187B29C2945/76367B29C2945/76381B29C2945/76481B29C2945/76498B29C2945/76568B29C2945/76933
Inventor 内山辰宏西村浩一
Owner FANUC LTD
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