Counterweight metal for exhaust valve of pressure cooker, special mould and manufacturing method

Abstract

The invention relates to a counterweight metal for an exhaust valve of a pressure cooker, which comprises a counterweight metal body and a lug boss. Vent holes are reserved on the top wall of the counterweight metal body. The lug boss is positioned in the center of the top inner wall of the counterweight metal body and integrated with the counterweight metal body. A special mould for manufacturing the counterweight metal for the exhaust valve of the pressure cooker comprises an upper die, a middle die and a lower die. A method for manufacturing the counterweight metal for the exhaust valve of the pressure cooker comprises the following steps of: a, blanking, namely, arranging the lower die in a molding die cavity of the middle die, and loading a metal powder raw material into the molding die cavity; b, pressing, namely, performing downward stamping and pressure maintaining from the top by using the upper die to pressing-mold the metal powder raw material; c, die opening, namely, causing the upper die to return to a high original position; d, de-molding, namely, upwards ejecting a pressing-molded work piece out from the bottom by using the lower die; e, sintering; f, polishing; and g, vapor oxidation treatment. The exhaust valve adopting the counterweight metal body with the structure has stable performance and high sealing performance.

Description

technical field [0001] The invention belongs to the technical field of hardware product manufacturing, and in particular relates to a counterweight metal body for an exhaust valve of a pressure cooker, a special mold and a manufacturing method. Background technique [0002] At present, the pressure cooker exhaust valves used in the market have similar valve body structures. The key part of the exhaust valve is the weight metal body, which is mainly composed of the weight metal body body and the boss. The boss is a pointed cone or a socketed cone-shaped plastic. Set of mounting and fixing parts. At present, the main process method is to process the weight metal body and the boss separately, and then process and combine them by riveting and other methods. The performance of the manufactured exhaust valve is unstable, the boss is easy to eccentric, and the sealing performance is poor. Contents of the invention [0003] The object of the present invention is to provide a meta...

AI Technical Summary

Problems solved by technology

At present, the main process method is to process the weight metal body and the boss separately, and then process them together by riveting and other methods. The performance of the manufactured exhaust valve is unstable, the boss is easy to eccentric, and the sealing performance is poor.

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