Preservation pressure control device null of electromotive injection molding

摘要

PURPOSE:To make pressure control peculiarity favorable by eliminating overshoot and a steady deviation, by a method wherein a subtracter putting out a deviation by receiving a pressure value detected by a load cell and a pressure command value generated by a pattern generator and an injection motor driving a screw by receiving the deviation are provided. CONSTITUTION:A load cell 16 fitted to a screw and a pattern generator 74 generating a pressure command value in a primary lag wave form by receiving a pressure command value in a step input wave form are provided. Further, a subtracter 71 putting out a deviation by receiving a pressure value detected by the load cell 16 and pressure command value generated by the pattern generator 74 and an injection motor 2 driving the screw by receiving the deviation are provided. Therefore, even if the pressure set value enters into a transient state at points where the pressure set value rises or falls in step, the pressure command value and detected pressure value become almost identical with each other and influence in nonlinear properties can be ignored.