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Pressure control device for injection molding machine

An injection molding machine and pressure control technology, applied in the field of pressure control devices, can solve problems such as damage to heating cylinders or metal molds, occurrence of burrs, etc., and achieve the effects of preventing deformation and high filling efficiency

Active Publication Date: 2016-05-04
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the peak pressure is too large, the heating cylinder or the metal mold may be damaged, or burrs may be generated in the molded product. Therefore, a technology is being sought to sufficiently fill the resin into the metal mold without generating an excessive peak pressure.

Method used

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  • Pressure control device for injection molding machine
  • Pressure control device for injection molding machine
  • Pressure control device for injection molding machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] figure 1 It is a schematic configuration diagram of an injection molding machine and a control device for controlling the injection molding machine.

[0023] A nozzle 2 is attached to the front end of the cylinder 1 into which the injection screw 3 is inserted, and a hopper 4 for supplying resin pellets to the cylinder 1 is attached to the rear end side of the cylinder 1 . The injection screw 3 is constituted as a conversion mechanism 7 that converts the rotational motion of the drive unit for driving the injection screw 3 in the axial direction of the injection screw 3 , the servo motor M1 for injection, the transmission, and the ball screw / nut, etc., into linear motion, The injection screw 3 is driven in the axial direction of the injection screw 3 to perform injection and back pressure control. In addition, the injection screw 3 is rotationally driven by a servo motor M2 as a rotational drive unit for rotating the injection screw 3 and a transmission device 6 const...

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PUM

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Abstract

A pressure control device of an injection molding machine is provided, detects a peak pressure generation time and a peak pressure value of injection pressure, and performs such a pressure control that the injection pressure keeps a detected peak pressure value during the period fro a peak pressure generation time until a time at which a condition of completion of the peak pressure maintenance control is satisfied in a pressure maintaining procedure. Further, a pressure control is performed according to a set pressure of the pressure maintaining procedure during a period from a completion time of a peak pressure maintenance control until a completion time of a pressure maintaining procedure.

Description

technical field [0001] The invention relates to a pressure control device of an injection molding machine. Background technique [0002] In the coaxial reciprocating screw type (in-line screw) injection molding machine, the screw in the heating cylinder is rotated while the screw is retracted, and the metering process of pressing the molten resin to the front end of the heating cylinder and the subsequent screw driving are performed. Advances to an injection process and a pressure holding process to fill the mold with molten resin. [0003] In the injection process, the molten resin in the heating cylinder is filled into the metal mold by advancing the screw according to the preset injection stroke and injection speed. Then, when advancing to the injection / pressure holding switching position, the injection process is switched to the pressure holding process. In the dwelling process, the pressure is controlled according to the preset dwelling pressure and dwelling time, so ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/77
CPCB29C45/77B29C2945/76498B29C2945/76006B29C2945/76214B29C2945/76381B29C2945/76598B29C2945/76665B29C2945/76862
Inventor 丸山淳平
Owner FANUC LTD