Injection member of molding machine and molding method

Abstract

An injection member of a molding machine capable of reducing a molding cycle and a maintenance time and preventing galling from occurring between a cylinder member and the injection member and a molding method. The injection member of the molding machine comprises a supply part (P1) to which a molding material is supplied through the molding material supply port of the cylinder member, a compression part (P2) melting and compressing the molding material supplied from the supply part (P1) thereto, and a weighing part (P3) weighing the molding material supplied from the compression part (P2) thereto. The supply part (P1) comprises a pressure regulating and switching point (q1) at a position apart a specified distance from the front end rearward and is divided into two parts through the pressure regulating and switching point (q1). The pressure of the molding material is gradually reduced in a pressure gradually reducing area (AR1) starting at the rear end of the supply part (P1) to the pressure regulating and switching point (q1). The pressure of the molding material is regulated in a pressure regulating area (AR2) starting at the pressure regulating and switching point (q1) to the front end of the supply part (P1).

Description

technical field [0001] The present invention relates to an injection part of a molding machine and a molding method. Background technique [0002] Conventionally, in a molding machine, such as an injection molding machine, resin, which is a molding material that is heated and melted in a heating cylinder as a cylinder member, is injected at high pressure and filled into the cavity space of a metal mold device. Cool and solidify in the cavity space to obtain a molded product. [0003] For this purpose, the above-mentioned injection molding machine has a mold clamping device and an injection device. The above-mentioned mold clamping device has a fixed platen and a movable platen, and the metal mold is closed and closed by moving the movable platen forward and backward by a mold clamping cylinder. Mold and mold opening. [0004] On the other hand, the injection device includes a heating cylinder for heating and melting resin supplied from a stocker, and an injection nozzle fo...

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned conventional injection device, if the molding cycle is shortened, the rotation speed of the measuring motor is increased, and the screw is rotated at a high speed, the pressure in the heating cylinder of the above-mentioned compression part will increase, and the resin will be burnt due to shear heat. excessively high temperature

As a result, the time for cooling the resin filled in the cavity space, that is, the cooling time becomes longer, and as a result, the molding cycle cannot be shortened.

[0007] In addition, as the temperature of the resin becomes excessively high, burns may occur in the resin, and foreign matter may be mixed in the molded product.

In addition, since the burnt resin adheres to the screw, it takes longer to maintain and manage the screw, that is, maintenance time

[0008] In addition, as the pressure in the heating cylinder increases, the force that pushes the screw against the inner peripheral surface of the heating cylinder increases, causing jamming between the heating cylinder and the screw.

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