Modified investment casting shell manufacturing method

Abstract

The invention discloses a modified investment casting shell manufacturing method. A shell is obtained through steps of cleaning the surface of a mold set, coating, stuccoing, hardening and air drying, wherein the steps of coating, stuccoing, hardening and air drying are repeated 8 times, zircon sand with the granularity group of 15 is used as surface layer sand in the first stuccoing and the second stuccoing, silica sand with the granularity group of 30 is used in the third stuccoing and the fourth stuccoing, silica sand with the granularity group of 60 is used from the fifth stuccoing to the eighth stuccoing, and a water dissolving method using water at 90DEG C is adopted for dewaxing. According to the modified investment casting shell manufacturing method, the zircon sand with the granularity group of 15 is used as the surface layer sand, the thermal expansion coefficient of the zircon sand is low and uniform, and the zircon sand is difficult to chemically react with iron oxide and accordingly has a good sand burning resisting function, quality of the shell is improved, and the zircon sand is high in price, the silica sand is used from the third stuccoing to the eighth stuccoing, so that production cost is reduced on the premise of obtaining a high quality casting.

Description

[0001] Technical field [0002] The invention belongs to the field of casting technology, and specifically relates to a method for making a shell by investment casting. [0003] Background technique [0004] The investment casting production process mainly includes three processes: mold making, shell making, and shell roasting and pouring. The shell making process is the wax module made by the mold making process through multiple cycles of coating, sanding, hardening, and air drying. The coating module is formed in the process, and then dewaxing (melting the wax mold) is performed to form the mold shell, and the cavity in the shell is the part model. [0005] With the rapid development of science and technology, the level of casting technology is also developing rapidly. For investment casting, the existing water glass and silica sand technology has high surface roughness and poor quality of castings. To solve this problem, the research and development Although the quality of the bl...

AI Technical Summary

Problems solved by technology

[0005] Nowadays, the development of science and technology is changing with each passing day, and the level of casting technology is also developing rapidly. For investment casting, the existing water glass plus silica sand process has high surface roughness and poor quality of casting blanks. In order to solve this problem, the research and development The advanced silica sol plus zirconium sand process, although the quality of the blank has been improved, it has also greatly increased the production cost