Wax liquor discharging technique for dewaxing of precision casting shell

Abstract

The invention discloses a process for discharging wax liquid in the process of dewaxing a precise casting mould shell without residual wax liquid, which comprises the following steps: (1) after an assembling mode of a wax piece is determined, the lowest point where the wax liquid is difficult to flow out when the wax piece is dewaxed on a die set is determined, and then a wax-discharging channel is pre-designed at the lowest point when a wax mould is designed, wherein one end of the wax-discharging channel is connected with the lowest point of a wax mould, while the other end is connected with an internal pouring channel or a main pouring channel in the wax mould, and the distance between the contact point of the wax-discharging channel and the internal pouring channel or the main pouring channel and a pouring basin in the vertical direction is smaller than the distance between the lowest point and the pouring basin; (2) the slurrying, sanding, and drying are performed on the wax mould layer by layer; (3) dewaxing is performed; and (4) a mould shell is poured, wherein after a cast product is formed, residual metals formed on the wax-discharging channel are cut away. The process has the advantages of not only reducing the wax material consumption and reducing the cost obviously, but also reducing the defects of slag inclusion and impurity inclusion for the cast product, improving the quality of the cast product, having good use effect, consuming few wax materials and the like.

Description

Technical field [0001] The invention relates to a precision casting mold shell dewaxing wax liquid discharge process, in particular to a high-pressure steam mold shell dewaxing method for dewaxing wax liquid discharge process. Background technique [0002] With the development of society, precision castings have been widely used in all industrial sectors including aviation and weapons, especially electronics, petroleum, chemical, transportation, light industry, textiles, pharmaceuticals, medical equipment, pumps and valve components. Investment casting is a casting process with less or no cutting. The castings produced have high dimensional accuracy, low surface roughness values, high flexibility, and strong adaptability, especially for parts with complex shapes. The superiority is more significant. In investment precision casting, due to the structural characteristics of the castings to be produced, part of the wax in the mold cavity will not flow out of the mold shell during th...

AI Technical Summary

Problems solved by technology

Wax is an expensive precision casting raw material, and the burning of wax will cause a substantial increase in the cost of precision castings

What's more serious is that the residue after wax burning and the impurities mixed in will remain in the mold shell, so during the pouring process of the casting, this part of the residue and impurities will be mixed into the molten steel, forming inclusion defects in the casting, Seriously affect the quality of the shell, and even cause waste