Shell making process method for preventing cracking and wax penetration of molten quartz mold shell during dewaxing

Abstract

The invention relates to the technical field of shell making, and particularly discloses a shell making process method for preventing cracking and wax penetration of a molten quartz mold shell during dewaxing. The method comprises the following steps: making a wax mold, cleaning a wax mold model, then making a first surface layer mold shell and a second surface layer mold shell, making a third transition layer mold shell and a fourth transition layer mold shell, making a fifth fixed layer mold shell, then demolding the mold shells, detecting whether cracks exist or not, if yes, winding a high-toughness galvanized iron wire in the direction perpendicular to the cracks, manufacturing a sixth fixed layer mold shell, a seventh fixed layer mold shell, an eighth fixed layer mold shell and a ninth fixed layer mold shell on the mold shells with or without winding of the high-toughness galvanized iron wire, sealing with slurry, drying, and storing to obtain the molten quartz mold shell. According to the shell making process method for preventing cracking and wax penetration of the molten quartz mold shell during dewaxing, a method of multiple surface layers and reinforcing layers is adopted, molten quartz sand is scattered, and drying and storing are conducted to obtain the molten quartz mold shell, after the molten quartz mold shell is dewaxed, the high-toughness galvanized iron wire is wound in the direction perpendicular to the cracks, and the problems of cracking and wax permeation of the mold shell are well solved.

Description

technical field [0001] The invention belongs to the technical field of shell making, in particular to a shell making process method for preventing dewaxing, cracking, and wax seepage of fused silica mold shells. Background technique [0002] In the production of investment precision castings, the process of investment precision casting is complex, including wax mold pressing, wax mold assembly, dipping, sanding, drying, dewaxing, roasting, pouring and post-processing. During the slurry dipping, sand showering and drying process, the slurry and sand tightly cover the surface of the wax pattern layer by layer, forming a mold shell blank on the surface of the wax pattern. After drying, the wax pattern in the mold shell blank is melted in a high-temperature steam dewaxing kettle. During the dewaxing process, since the thermal expansion coefficient of the wax pattern is greater than that of the mold shell, the mold shell is prone to cracks, resulting in scrapping. So now it is ...

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