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Control method of injection molding and control apparatus of injection molding

A technology of injection molding and control methods, which is applied in the field of injection molding control and injection molding control devices, can solve the problems of shortening mold life, pressure punching, and increasing the clamping force of injection molding machines, so as to prevent overfilling and prevent injection The effect of pressure overshoot

Inactive Publication Date: 2009-12-23
SONY GRP CORP
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  • Description
  • Claims
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Problems solved by technology

[0019] In the molding of thin products such as the illustrative examples above, the control method in the related art causes pressure overshoot during filling, and decompression occurs after switching the control to maintain pressure
It is therefore very difficult to control the filling pressure and hold the pressure, which can lead to serious problems regarding the quality of the molded product
In addition, there is a problem that the occurrence of peak pressure shortens the life of the mold and increases the clamping force required by the injection molding machine

Method used

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  • Control method of injection molding and control apparatus of injection molding
  • Control method of injection molding and control apparatus of injection molding
  • Control method of injection molding and control apparatus of injection molding

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Embodiment Construction

[0033] figure 2 is a graph showing material data obtained from experiments performed to describe the compressive strength of the molded material constituting the principle of the present invention. In this experiment, PC (polycarbonate) was used as a molding material of a screw in-line injection molding machine actually used. The gauge values ​​(stroke of the screw) for a screw with a diameter of 36 mm were set at 50 mm, 80 mm and 120 mm. Record the pressure of the molding material and the position of the screw when injecting the molding material under the conditions specified above. The results obtained by calculating the compressive strength of the molding material PC based on the recorded data are plotted in figure 2 on the graph of . exist figure 2 In , the abscissa is for the filling pressure (MPa), and the ordinate is for the compression ratio (%).

[0034] refer to figure 2 , the relationship between filling pressure and compression ratio changes linearly and ...

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Abstract

A control method of injection molding includes the steps of: filling molten resin in an injection molding die by velocity control until a detection value of a filling pressure of the molten resin reaches a first set pressure value; filling the molten resin by switching control from the velocity control to pressure control by which the control is performed at the first set pressure value at a timepoint when the detection value of the filling pressure reaches or exceeds the first set pressure value; and switching the control to holding pressure control by which the control is performed at a second set pressure value at a time point when the filling velocity drops to or below a set velocity while filling is performed by the pressure control.

Description

[0001] References to related applications [0002] The present application contains subject matter related to that disclosed in Japanese Priority Patent Application JP 2008-162352 filed in the Japan Patent Office on Jun. 20, 2008, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to an injection molding control method and an injection molding control device suitable for using the control method. Background technique [0004] An injection molding machine generally includes a molding unit, a clamping unit, and an injection unit, and the molding unit has a fixed die and a movable die. Mold closing, mold clamping, and mold opening of the molding unit are performed by moving the movable mold back and forth with the clamping unit. In association with mold clamping, a cavity space is defined between the fixed mold and the movable mold. The injection unit has a heating cylinder and a screw provided to be rotatab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/77
CPCB29C2945/76006B29C2945/76882B29C45/77B29C2945/76214B29C2945/76498B29C2945/76946B29C2945/76113B29C2945/76404
Inventor 鸿丸几久夫
Owner SONY GRP CORP
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