Title:
IN-MOLD PRESSURE MEASURING METHOD
Document Type and Number:
Japanese Patent JP3285701
Kind Code:
B2
Abstract:
PURPOSE: To measure the pressure in a cavity without attaching an in-mold pressure sensor to the interior of a mold.
CONSTITUTION: In an injection molding machine wherein the mechanism having a member (ejector pin) 8 moved within a mold such as a product ejecting mechanism is driven by a servo motor Me, the moving member 8 is held to a predetermined positioning place during an injection and dwelling process. The moving member 8 is pressed by the rising of the pressure in a cavity due to injection but the servo motor Me outputs output torque so as to keep the predetermind positioning place. The load applied to the servo motor Me is estimated by an observer to measure the pressure in the cavity. Or, the pressure in the cavity is measured on the basis of the drive current value and torque command value (current command value) of the servo motor.
Inventors:
Keno Kamiguchi
Tetsuaki Neko
Tatsuhiro Uchiyama
Tetsuaki Neko
Tatsuhiro Uchiyama
Application Number:
JP11344994A
Publication Date:
May 27, 2002
Filing Date:
May 02, 1994
Export Citation:
Assignee:
FANUC CORPORATION
International Classes:
B22D17/32; B29C45/26; B29C45/50; B29C45/77; (IPC1-7): B29C45/50; B29C45/26; B29C45/77
Domestic Patent References:
| JP6856A |
Attorney, Agent or Firm:
Matsumoto Takemoto (4 outside)