Process for centrifugally casting high-quality tin bronze sleeve

Abstract

The invention discloses a process for centrifugally casting a high-quality tin bronze sleeve. A coreless line-frequency furnace is adopted to smelt; a horizontal centrifugal casting machine is used for casting; a material adopts ZQSn6-6-3; a mold is preheated at a temperature of 200 DEG C; the working temperature is 60-80 DEG C; the temperature of molten copper discharged from the furnace is 1170-1220 DEG C; the casting temperature is 1120-1140 DEG C; the rotating speed of a casting mold is 770 r / m; the casting is performed from fast to slow; the casting time is 7-8 seconds; mold paint consists of 50% of ZnO powder and 50% of SiO2 powder; and the mold release is performed at a temperature of 450 DEG C. The process is simple, is liable to be controlled, reduces air holes and the cold separation, and improves the yield.

Description

[0001] technical field [0002] The invention belongs to a tin bronze sleeve casting process, in particular to a centrifugal casting high-quality tin bronze sleeve process. [0003] Background technique [0004] In the past, the tin bronze sleeve was cast by sand casting, and the reject rate was over 50%. Later, centrifugal casting was adopted, but the reject rate was still as high as 41.7%. The casting defects are mainly porosity and cold separation. [0005] Contents of the invention [0006] In order to overcome the above-mentioned defects existing in the prior art field, the object of the present invention is to provide a process for centrifugally casting a high-quality tin bronze sleeve to improve the yield. [0007] The high-quality tin bronze sleeve process of centrifugal casting provided by the invention is smelted in a coreless power frequency induction furnace and cast with a horizontal centrifugal casting machine, and the material is ZQSn 6-6-3 , the mold is...

AI Technical Summary

Problems solved by technology

The casting defects are mainly porosity, cold