Method for controlling the forward movement speed of the screw in an injection molding machine
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United States of America Patent
Stats
-
Dec 28, 2004
Grant Date -
Nov 7, 2002
app pub date -
Apr 29, 2002
filing date -
May 7, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the filling step, the forward movement speed of the screw is controlled in accordance with a predetermined speed pattern until the screw reaches a deceleration initiation point, LS4B. After the screw reaches LS4B, a deceleration step is started. In the deceleration step, the forward movement speed of the screw is controlled in a feedback manner such that the internal pressure of the mold reaches a predetermined target pressure. When the screw reaches a pressure holding initiation point, LS4 (or pressure holding initiation time, TR2), the pressure holding step is started. In the pressure holding step, the target pressure, which is a function of time, is changed with time in accordance with a program. When the operation goes to the pressure holding step, the set of PID coefficients within the feedback control loop are replaced by different set of PID coefficients.
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