Resin-molding device and method for producing resin-molded product

Abstract

The invention provides a resin-molding device and a method for producing a resin-molded product and aims to reduce the influence of backpressure due to pressure transmission for improving the resin-molded product. The resin-molding device includes a mold-clamping mechanism used for closing a molding die and another molding die; a plunger driving mechanism, which moves a plunger in a cylinder of the molding die; a clamping pressure detection unit, which detects the clamping pressure of the mold-clamping mechanism onto the molding die; a transmission pressure detection portion, which detects thetransmission pressure of the plunger driving mechanism on resin; and a control unit, which controls the mold-clamping mechanism on the basis of the clamping unit detected by the clamping pressure detection unit and the transmission pressure detected by the transmission pressure detection portion. When the control unit detects that the transmission pressure increases, the mold-clamping mechanism is controlled in a manner that the clamping pressure increases relative to the transmission pressure; in addition, when the control unit detects that the transmission pressure decreases, the mold-clamping mechanism is controlled in a manner that the clamping pressure is indenpendent of the transmission pressure and becomes a specified value.

Description

technical field [0001] The present invention relates to a resin molding device and a method for manufacturing a resin molded product. Background technique [0002] Regarding the resin molding apparatus for performing resin molding by transfer molding, there is a resin molding apparatus in which a molded product is clamped between a lower mold and an upper mold, and a molded product is formed on the lower mold by a plunger. The resin is fed by pressure from a pot, and the resin is supplied to the cavity formed between the lower mold and the upper mold to perform resin sealing. [0003] In the above-mentioned resin molding device, during resin molding, the injection pressure (transmission pressure) of the resin by the plunger acts in the direction of opening the mold as a back pressure (back pressure), so it may act on the molded product. Clamping pressure changes, resulting in resin burrs. In addition, it is conceivable to set the clamping pressure relatively high in consid...

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned resin molding device, during resin molding, the injection pressure (transmission pressure) of the resin by the plunger acts in the direction of opening the mold as a back pressure (back pressure), so it may act on the molded product. Clamping pressure changes, resulting in resin burrs

In addition, it is also conceivable to set the clamping pressure to be relatively large in consideration of the back pressure, but if this is the case, the molded product may be damaged.

Images