Preparation process for molding material

Abstract

The invention discloses a preparation process for a molding material. The preparation process is characterized by comprising the following steps: (1) conveying used wax leaked out from a de-waxing kettle to a de-watering barrel by using a wax liquid conveying apparatus, carrying out standing at 70 to 80 DEG C for 4 to 6 h, then opening a draining valve to discharge water produced after standing, closing the draining valve when the wax liquid begins flowing out, and opening a wax discharging valve to discharge the wax liquid into a stirring barrel; (2) starting a stirring switch to allow the wax liquid to be stirred at 95 to 115 DEG C for more than 5 h and removing unwanted water, wherein 5 to 8% of unused wax is added into the stirring barrel each time and the stirring switch can be shut down when the surface of the wax liquid is free of foam; (3) filtering the de-watered wax liquid with a 200-mesh stainless steel screen and then conveying the filtered wax liquid to a standing barrel with a temperature of 82 to 93 DEG C for heat-preserved standing for 10 h or above; and (4) conveying the clean wax liquid obtained after standing into a wax storage barrel of a wax injector by using the wax liquid conveying apparatus and carrying out heat preservation for 2 to 5 h. The preparation process for the molding material strictly controls technological parameters of each stage, improves the performance of the molding material, and is substantially reduced in procedures and simple in process.

Description

technical field [0001] The invention belongs to the field of pouring technology, in particular to a molding material preparation technology. Background technique [0002] In the prior art, the production process of investment castings includes the preparation of mold materials, the manufacture of wax patterns, the manufacture of mold shells and the baking of mold shells. The performance of the molding material should not only ensure that the investment mold with accurate size, high surface finish, good strength and light weight can be easily produced, it should also create conditions for the manufacture of the mold shell and obtain good castings. Mold materials are generally prepared with wax materials, natural resins and plastics. The mold materials that are mainly prepared with wax materials are called wax-based mold materials. Their melting point is low, which is 60-700C; It is a resin-based molding material with a slightly higher melting point, about 70-1200C. However,...

AI Technical Summary

Problems solved by technology

However, the preparation of the existing mold materials is complex in process and poor in economic performance, so it is urgently needed to be rationally optimized.