Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1996-06-27
1998-03-31
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 405, 2643281, 425145, 36447505, B29C 4577
Patent
active
057334862
ABSTRACT:
A reference pressure of a melted material injected into a mold cavity of a mold is set at each of a plurality of positions in a barrel, a nozzle, and the mold cavity as a function of injection passing time from a start of an injecting process or a function of a distance of movement of an injection plunger, and the movement of the plunger is started at a temporarily constant injection speed. The pressure of the melted material is sensed at the plurality of positions in any order during an injection passing time from the start of the injection process wherein the plunger is started to move or during the movement of the plunger. A correction value of the injection speed for eliminating a difference between a pressure value of the melted material sensed and the reference value set at the position at which the sensed pressure is sensed, in a range that the sensed pressure of the melted material exceeds the reference value corresponding to the sensed pressure, and the injection speed is corrected in accordance with the correction value. The correction value of the injection speed, and the injection passing time or the distance of the movement of the plunger, corresponding to the range is stored in a memory unit. The correction value and the injection passing time or the distance are characterized to a desired injection speed pattern. And, the pattern is read out from the memory unit as an injection molding speed condition.
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Hayasi Syoji
Katuta Hirosi
Heitbrink Jill L.
Toshiba Machine Co. Ltd.
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