Title:
SYSTEM FOR CONTROLLING MOLD CLAMPING FORCE IN MOTOR-DRIVEN INJECTION MOLDING MACHINE
Document Type and Number:
Japanese Patent JP3038469
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To perform to hold a set mold clamping force by a smaller electric power by rotating reversely a ball screw under a condition where the mold clamping force is kept within a allowable fluctuation range during mold clamping is performed after the mold clamping force reaches a little larger mold clamping force.
SOLUTION: A motor-driven injection molding machine is provided with a mold clamping device 20 wherein a servo motor 26 is a driving source and rotational force is converted to a propelling power by means of a ball screw and a nut. To a preset mold clamping force, an allowable fluctuation range is set above and below it and when the mold clamping process is started, a mold clamping force being larger by the allowable fluctuation range than the set mold clamping force is generated. A ball screw is rotated reversely under a condition where the mold clamping force is kept within the allowable fluctuation range during mold clamping is performed after the mold clamping force reaches a little larger mold clamping force. Behaviors of the mold clamping force corresponds to behavior of displacement of a crosshead 28 in the mold clamping device 20 within a range where the mold clamping force is small.
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Inventors:
Kazuo Hiraoka
Application Number:
JP6968296A
Publication Date:
May 08, 2000
Filing Date:
March 26, 1996
Export Citation:
Assignee:
Sumitomo Heavy Industries Ltd.
International Classes:
B22D17/26; B29C45/66; B29C45/76; (IPC1-7): B29C45/66; B22D17/26; B29C45/76
Domestic Patent References:
| JP486211A | ||||
| JP63262221A |
Attorney, Agent or Firm:
Yosuke Goto (1 person outside)