Title:
METHOD FOR CONTROL OF CLAMPING PRESSURE IN INJECTION COMPRESSION MOLDING
Document Type and Number:
Japanese Patent JP3232550
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To determine clamping pressure and its application time by only inputting an initial set value by a method wherein a transfer distance of a movable mold during clamping is detected with a positional sensor, time when a rate of change in a transfer speed of the movable mold becomes constant is taken as a reference, and clamping force at that point of time is increased.
SOLUTION: A rate of change δn of transfer speed of a movable mold to a fixed mold is obtained. Operation is continued until the rate of change δn becomes constant, and a clamping time Tx from completion of injection to an inflection point X wherein the rate of change δn of the transfer speed becomes constant is obtained. Clamping time Tx on the first pressure obtained thus is taken as a reference, and control of clamping pressure of injection compression molding in a next molding cycle is carried out. Therefore, molding by the necessary minimum clamping pressure can be carried out, a flow speed of resin in a cavity by clamping force becomes consequently lowest, and a flow orientation of a molded product is decreased. Then, the molded product of small warpage can be obtained thereby.
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Inventors:
Etsuo Okahara
Yoshizo Mukunashi
Yoshizo Mukunashi
Application Number:
JP23649995A
Publication Date:
November 26, 2001
Filing Date:
September 14, 1995
Export Citation:
Assignee:
Ube Industries,Ltd.
International Classes:
B29C45/04; B29C45/64; B29C45/70; B29C45/76; B29C45/56; (IPC1-7): B29C45/64; B29C45/70; B29C45/76
Domestic Patent References:
| JP79518A | ||||
| JP4327920A | ||||
| JP63125321A |
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