Investment casting quick forming method for polystyrene coated sand mold shell

Abstract

The invention provides an investment casting quick forming method for a polystyrene coated sand mold shell. The method comprises the following steps of S1, manufacturing a mold set from a polystyreneanode membrane, obtained by 3D printing, of a part; S2, selecting a sand box with an appropriate size; S3, injecting coated sand into the sand box around the mold set to the top of the mold set and compacting the coated sand by vibration in the sand box; S4, placing the sand box in a heating box, and raising the temperature of the heating box to a glass-transition temperature of polystyrene; S5, raising the temperature in the heating box continuously to a melting temperature of polystyrene; S6, overturning the sand box slowly to pour out a polystyrene molten liquid; S7, starting a blowing mechanism to clean up a polystyrene residual liquid in the sand box thoroughly; S8, taking out a cured coated sand cavity and reinforcing the periphery of the coated sand cavity; and S9, implementing post-step operations of casting forming such as pouring, freezing, falling and cleaning to obtain a quick sample piece. The forming method shortens the period of manufacturing the shell by casting greatly, so as to achieve the purposes of quick printing of the anode membrane, quick manufacturing of the mold shell and quick forming of the sample piece.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a rapid prototyping method for investment casting of polystyrene-coated sand mold shells. Background technique [0002] Investment casting rapid prototypes usually use 3D printing technology (including SLA, SLS, LOM, FDM, etc.) to print a male mold of resin, plastic, polystyrene or composite materials, and then press investment casting on the surface of the male mold. The shell making process includes multi-layer shell making, roasting, and pouring; the positive mold is quickly printed by 3D technology, which saves the time for making metal molds (and then making the positive mold / wax mold). However, although 3D printing saves the manufacturing cycle of the positive mold / polystyrene mold, the long cycle of precision casting shell production also affects the connotation of "rapid manufacturing" to a certain extent: the common precision casting enterprises in China, whet...

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Problems solved by technology

[0003] In view of this, the present invention proposes a rapid prototyping method for investment casting of polystyrene-coated sand mold shells, which is used to solve the problem in the prior art that after 3D printing the positive film, the casting shell cycle is long, and the sample cannot really realize rapid prototyping. The problem

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