US Patent No. 9,289,934

CONTROL METHOD FOR INJECTION MOLDING MACHINE


Patent No. 9,289,934
Issue Date March 22, 2015
Title Control Method For Injection Molding Machine
Inventorship Tatsuhiro Uchiyama, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,289,934

1. A control method for an injection molding machine, the control method comprising:
obtaining a screw or plunger stop position as a position
where a leading flow end of a resin does not reach a gate portion, when an application of an injection pressure is suspended
at the moment when the screw or the plunger is stopped after being advanced from an injection starting position, and

where the leading flow end of the resin reaches the gate portion, when the screw or the plunger is advanced from the injection
starting position to the stopped position and the application of the injection pressure is suspended after retention for a
predetermined period; and

in an injection process in which the screw or the plunger is advanced to inject the resin, which is a molten resin, into a
mold, the control method further comprising:

stopping the advance of the screw or the plunger at the screw or plunger stop position and holding for a predetermined period;
and

resuming the advance of the screw or the plunger for an injection operation.