INJECTION MOLDING MACHINE AND METHOD OF CONTROLLING THE INJECTION MOLDING MACHINE

摘要

An injection molding machine, comprising a pre-pressure adding means (2) adding a pre-pressure (B) acting in the opposite direction of a formed material pressure (A) received by a screw (1) to a detection means (3) and/or the screw (1), the detection means (3) detecting the axial pressures (A) and (B) of the screw (1), and a screw movement control means (4) controlling the axial pressure based on a difference between the pre-pressure (B) and the formed material pressure (A), wherein the pre-pressure adding means (2) is made non-contact with the detection means (3), a forward and backward driving motor (17) is disposed adjacent to a heating tube (10), and a screw connector (21) at the rear end of the screw (1) is spline-connected inside a rotating rotor of a screw rotating motor (12), whereby the formed material pressure received by the screw can be detected accurately without being affected by the wear of the injection molding machine so as to properly control the axial pressure of the screw and to reduce the entire size of the injection molding machine.