Pressing die and die-cast forming method

Abstract

The invention belongs to the technical field of dies, and particularly discloses a pressing die and a die-cast forming method. A male die fixed plate is fixed to the bottom end face of an upper die base plate. A male die core is fixed to the bottom end face of the male die fixed plate. Two supporting blocks are fixed to the upper end face of a lower die holder. Guide columns are fixed to the diagonal positions of the lower die holder. A lower die base plate is fixed to the upper end face of the lower die holder. A pressing cavity is formed in the upper end face of a female die plate. An ejecting and pushing rod is arranged on the lower die base plate. The telescopic end of the ejecting and pushing rod is located in the pressing cavity. The pressing cavity corresponds to the male die core.An installing groove is formed in the pressing cavity and located at the top end of the ejecting and pushing rod. A heat preserving cavity is formed in the male die core. An air guide pipe is installed on the side wall of the heat preserving cavity. Air guide micropores are formed in the bottom end face of the heat preserving cavity. The diameter of the air guide micropores is smaller than the minimum diameter of powder plastic. It is avoided that a metal insert in a plastic piece deviates or moves when the male die core rises and then the accuracy of the metal insert in the plastic piece is affected.

Description

technical field [0001] The invention belongs to the technical field of moulds, in particular to a pressing mold and a die-casting molding method. Background technique [0002] Powder compression molding is a forming method that uses pressure to compact the powder placed in the mold to a compact structure and become a green body with a certain shape and size. The green body formed by pressing has low moisture content, dense green body, small drying shrinkage, accurate shape and size, high quality, simple molding process, large production capacity, and is convenient for large-scale mechanized production. It is widely used at present. [0003] Compression molding method, also known as compression molding, is mainly used for the molding of thermosetting plastics. Bakelite and aminoplast products are mostly manufactured by pressing. A small number of thermoplastics with extremely high melt viscosity and poor fluidity, such as polytetrafluoroethylene, are also formed by pressing...

AI Technical Summary

Problems solved by technology

[0004] However, when the existing pressing molds are used to press and form thermoplastics, especially when the metal workpiece is embedded in the pressed workpiece, the gas in the plastic and the gas in the molding space need to be deflated before the workpiece is pressed and formed. When there are metal inserts pressed into the product, it is not allowed to deflate, because when the punch is slightly withdrawn from the pressing cavity, the separation between the punch and the product that has not been fully hardened can cause the movement of the insert, which will affect the Product quality

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