Method and mould for manufacturing valve retainer

Abstract

The invention discloses a method for manufacturing a valve retainer, which comprises the following steps: arranging a sprue on a mould; and carrying out smelting, casting, demoulding, heat treatment and ground finishing on metal, wherein the mould is a directly molded mould for the valve retainer. Compared with the prior manufacturing method, the method for manufacturing the valve retainer saves four steps of sliping a head, boring an inner hole, digging up an excircle and cutting off. Therefore, the method simplifies the production steps, saves a large amount of labors, reduces the equipment input and energy consumption, shortens the production cycle and reduces the production cost.

Description

technical field [0001] The invention relates to a manufacturing method of a valve seat ring, and also relates to a direct forming mold of the valve seat ring used in the manufacturing method. Background technique [0002] The valve seat ring is one of the important parts of the automobile engine. Its function is to ensure the smooth exhaust and sealing of the exhaust valve of the automobile engine. Therefore, the valve seat ring is required to have the characteristics of high temperature resistance, wear resistance and oxidation resistance. The material used is high chromium alloy, and it also has high requirements on the processing accuracy of the specifications and dimensions of the valve seat ring, and the allowable error is extremely small. With the development of science and technology, people have higher and higher requirements for the performance of engine valve seat rings, and technicians are constantly adjusting and optimizing the processing technology and casting t...

AI Technical Summary

Problems solved by technology

The mold used is a cylindrical mold, and a columnar mandrel is fixed in the center of the cylindrical mold. After casting and demoulding, a tubular blank casting is obtained, which is cut and processed to obtain a valve seat ring. However, the use of this mold will cause the following problems: due to the high processing accuracy requirements for the valve seat ring, the requirements for the central core mold of the cylindrical mold are also very high, that is, the outer cylindrical surface of the cylindrical core mold is required to be relatively uniform as a whole, and the installation The core mold needs to be accurately positioned, and the position of the core mold is often prone to deviation during the casting process, which causes the center hole of the cast tubular blank casting to deviate from the central axis, and also causes uneven wall thickness of the valve seat ; Secondly, when casting the cylindrical mold, the amount of casting at one time is large, and it is easy to generate air bubbles during the casting process, which makes the produced tubular blank castings produce local defects, and the molten metal is easy to make after casting under the action of gravity. The tubular blank castings are uneven up and down, prone to inclination and deformation

After the above-mentioned machining operations of chip head, boring inner hole, and outer circle removal, it is necessary to cut the tubular blank casting horizontally and then grind it to obtain a valve seat ring that meets the production requirements. Therefore, the production steps are relatively cumbersome. , the equipment and labor required to be invested are greatly increased, and the tubular blank casting needs to be corrected in the subsequent mechanical processing, which greatly prolongs the production cycle and greatly increases the production cost, thus affecting the market competition of the final valve seat ring force

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