Improvement method of carburized part of screw

Abstract

The invention discloses an improvement method for a carburized part of a screw, relates to the technical field of fastener preparation, and solves the problems that the production process period is prolonged, the production cost is increased and the production benefit is greatly reduced due to the fact that the carburized part in the screw is eliminated by adopting a heat treatment mode in the prior art. The improvement method for the carburized part of the screw comprises the following steps of melting raw materials into molten iron at 1500-1570 DEG C, and pouring the molten iron into a spheroidizing ladle; adding bismuth into the spheroidizing ladle, and uniformly fusing the bismuth with the molten iron; pouring the fused molten iron into a cavity for smelting and pouring; and machining the poured casting. According to the method, the number of the carburized parts in the screw is effectively reduced, efficient production of the screw is achieved, and the production cost of the screw is reduced.

Description

technical field [0001] The present application relates to the technical field of fastener preparation, in particular to an improved method for screw carburized parts. Background technique [0002] Screws are a common type of fastener on the market. It is a type of fastener consisting of a head and a screw. [0003] Most of the existing screws adopt the overall metal structure. During the manufacturing process, when the molten iron is transformed into a solid state, due to the fast cooling rate, carburization is easy to occur on the edges, corners, and thin walls of the casting. body, resulting in high hardness and brittleness of the workpiece, which is not conducive to processing and forming. [0004] At present, the elimination of carburized parts in cast iron or steel is mainly achieved through normalizing, spheroidizing annealing, drawing, high-temperature recrystallization annealing, but for the production of small fasteners such as screws, the heat treatment process wi...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides an improvement method for screw carburized parts, which solves the problems in the prior art that heat treatment is used to eliminate carburized parts in screws, which leads to a longer production process cycle, increased production costs, and greatly reduces production efficiency. , thus realizing the efficient production of screws and reducing the production cost of screws

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