Process for manufacturing shell of impeller of electrical pump

Abstract

The invention discloses a process for manufacturing a shell of an impeller of an electrical pump, which comprises: 1) a step of shell manufacturing, in which a wax mold of the impeller is subjected tosizing, stuccoing and drying layer by layer by zircon powder slurry and mullite sand slurry; 2) a step of dewaxing under conditions of a pressure of between 0.6 and 0.75 MP and a temperature of between 150 and 170 DEC C for 6 to 10 minutes; and 3) a step of roasting, in which the roasting temperature is 1,000 to 1,100 DEG C, and the temperature is kept for at least 30 minutes when the resulting product of the dewaxing reaches the temperature. The shell of the impeller of the electrical pump manufactured by the invention has the advantages that: the rate of leaking shell is low; and at the same time, a flow passage is filled with dry and scattered mullite sand, so the shell in the flow passage is easy to clean after a casting is poured, labor efficiency is greatly improved, and consequently the rate finished casting and the sand cleaning efficiency are improved. The preparation process of the invention has the advantages of high rate of finished product, short production period, easy sand cleaning and the like.

Description

Technical field [0001] The invention relates to a manufacturing process of an electric pump impeller shell, in particular to a manufacturing process of a precision casting shell of an electric pump impeller with a flow channel height of less than 10mm, a complicated inner cavity, and a flow channel of a spatially curved electric pump impeller, belonging to the electric pump impeller Manufacturing technology. Background technique [0002] The impeller is one of the main components of the electric pump, and it plays a very important role in the electric pump. Because the flow channel of this kind of impeller is a space curved structure, and the flow channel is narrow and deep, it increases the difficulty of manufacturing the impeller shell. . Manufactured in accordance with the general process, it has the shortcomings of high rejection rate, long production cycle, and difficult to clean sand. Therefore, the design of the impeller casting process is particularly important. Incorrect...

AI Technical Summary

Problems solved by technology

[0002] The impeller is one of the main components of the electric pump and plays a very important role in the electric pump. Because the flow channel of the impeller is a curved surface with a complex structure, and the flow channel is narrow and deep, it increases the difficulty of manufacturing the impeller shell.

Manufactured according to the general process, there are disadvantages of high scrap rate, long production cycle, and castings are not easy to remove sand, so the design of the casting process of the impeller is particularly important. If the casting process is not correct, it will cause internal leakage of molten steel in the flow channel of the impeller shell during pouring. scrap casting

Blind production will cause great economic losses, so the manufacturing method of the shell is a very important link, which directly affects the pass rate of castings

Images