Molding method of injection molding machine

摘要

In performing molding by injecting and filling a resin by an injecting device with a predetermined injection pressure into a mold formed of a fixed mold and a movable mold clamped by a clamping device with a predetermined clamping force, at least a clamping device which enables natural compression of the resin with solidification of the resin in the mold is used as the clamping device, a molding injection pressure and a molding clamping force with which a predetermined mold gap is generated between the movable mold and the fixed mold in injection and filling and a non-defective product can be molded are acquired and set in advance, the clamping device is clamped with the molding clamping force during production, the molding injection pressure is set as a limit pressure, and after the resin is injected and filled in the mold by driving the injecting device.

主权项

1. A molding method of an injection molding machine in which molding is performed by injecting and filling a resin by an injecting device with a predetermined injection pressure into a mold formed of a fixed mold and a movable mold clamped by a clamping device with a predetermined clamping force, wherein:
the clamping device, which enables natural compression of the resin with solidification of the resin in the mold is used, the clamping device is a direct-pressure type hydraulic clamping device which displaces the movable mold by a driving ram of a clamping cylinder, wherein the natural compression results from the following: a molding injection pressure and a molding clamping force are acquired and set in advance, with the molding injection pressure and the molding clamping force a predetermined molding gap is generated between the movable mold and the fixed mold in injection and filling, the clamping device is clamped with the molding clamping force from mold closing to mold opening so that the molding clamping force is maintained constant, the molding injection pressure is set as a limit pressure, and after the resin is injected and filled in the mold by driving the injecting device, the molding product is taken out after predetermined cooling time has elapsed, and in injection and filling of the resin in the mold, after the injection pressure reaches the limit pressure, the injection pressure is controlled to be maintained at the limit pressure.