Technique for processing tin bronze valve body and tube union

Abstract

The present invention discloses a processing technique of a tin bronze valve body and a pipe joint which comprises a modification processing of tin bronze, extruding and forging of the unburnt earthenware, forging and so on. The tin bronze is metamorphosed and modified by the present invention by adding rare earth to purify and RE-Li-Bi alloy composite modifier to refine the crystal grain and improves the scalability of bronze and addresses the tin bronze sealing problem. The forging of an unburnt earthenware piece is a technique which is light and fast at the beginning, heavy and slow in the middle and is formed by tapping in the brittle region. The processes of forging the original unburnt earthenware, extruding the unburnt earthenware, forging the tin bronze valve body and producing a pipe joint are integrated; the work which needed a plurality of months at the beginning is capable of being integrated and finished in a production cycle, so the processing accuracy is increased; the process is simplified; the production efficiency is improved and the production cost is reduced. The present invention is mainly used for the bronze valve which is provided with the dimension of 3 / 8 inches to 4 inches and the series components for forging the pipe joint.

Description

【Technical field】 [0001] The invention relates to a tin-bronze alloy piece, in particular to the processing technology of a tin-bronze valve body and a pipe joint. 【Background technique】 [0002] Among copper alloys, only brass is suitable for die-casting, mainly because brass has a low melting point and the crystallization interval of the alloy is small, which is beneficial to overcome the solidification stress caused by rapid cooling. In addition, the price of zinc is much lower than that of Cu and Al, and the supply is abundant. , so the cost is low. The solid solubility of Zn in copper is also large, which is beneficial to the improvement of strength and hardness. Die-casting copper alloys are generally used to make high-temperature strength, corrosion-resistant and wear-resistant components, such as water pipe joints, automobile shift forks, signs, door locks, furniture accessories, fire sprinklers, etc., among which YZCuZn is the domestic 16 Si 4 Die-casting brass i...

AI Technical Summary

Problems solved by technology

[0004] Since tin bronze is difficult to obtain castings with good density under general conditions, especially under sand casting conditions, the problem of air tightness has become a bottleneck for tin bronze to further play a role in this field

[0005] At present, the main forming method of valve bodies and pipe joints is casting, especially precision castings. However, the performance, reliability, yield, material utilization and equipment capabilities of die-casting products are limited, and cannot meet the requirements of aviation and military industries. Requirements for high-performance structural parts in the field

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