Compression molding apparatus and compression molding method of resin molded product comprising fiber

摘要

A material heating mechanism for melting the material into a molten state, an upper plate to which the upper mold is attached and a lower plate to which the lower mold is attached, at least three position sensors for detecting a distance between the upper mold and the lower mold or the upper plate and the lower plate, and at least three compression hydraulic cylinders installed to any one of the upper plate and the lower plate and individually controlled according to information of the position sensors.

主权项

1. A compression molding apparatus of a resin molded product including a fiber, which supplies a resin material including a fiber to an open lower mold by a material supply device, then closes the lower mold and an upper mold, and compresses the material, the compression molding apparatus comprising:
a moving device configured to transfer the lower mold between a supply position out of a press machine and a pressurization position in the press machine in which the lower mold is open; a material supply device, provided with a material heating mechanism configured to melt the resin material with the fiber into a molten state, and configured to supply the resin material with the fiber onto the lower mold positioned at the supply position out of the press machine; an upper plate to which the upper mold is attached and a lower plate to which the lower mold configured to transfer between the supply position and the pressurization position is attached; at least three position sensors for detecting a distance between the upper mold and the lower mold or the upper plate and the lower plate; a pressure sensor configured to detect a pressure of a working fluid; and at least three compression hydraulic cylinders installed to any one of the upper plate and the lower plate and individually controlled according to information of the position sensors and the pressure sensor, wherein compression molding is performed after the lower mold is transferred to the pressurization position, in which the lower mold is placed beneath the upper mold of the press machine, and comprises: 1) a first pressurization process that individually conducts either a position control or a speed control to each of the compression hydraulic cylinders based on information of the position sensors, and 2) a second pressurization process that either individually controls the compression hydraulic cylinders based on only information of the pressure sensor, or individually controls the compression hydraulic cylinders based on information of the position sensors and the pressure sensor.