Inadequate Degassing Treatment of the Mold Surface

After casting molding, the product surface is covered with tiny pits. Surface defects directly affect the appearance quality and use performance of the product, and are particularly obvious in transparent products. This defect affects the appearance quality of the product and reduces the market competitiveness of the product.

(1) In terms of the mold: porous mold materials (such as plaster molds, the mold structure or condition directly affects the flow and molding of the material in the cavity. (2) In terms of gas removal: residual gas in the pores of porous metal molds), and gas retention forms internal defects affecting the product's density. (3) In terms of the mold: release agent blocking the mold micropores and reducing air permeability, the mold structure or condition directly affects the flow and molding of the material in the cavity.

(1) Process strengthening: fully vacuum-degas porous molds before casting, increase the vacuum degree and ensure sufficient treatment time, and proceed to the next process only after confirming that bubbles are completely eliminated. (2) Operating specifications: regularly clean the micropores on the mold surface, formulate cleaning operation standard work instructions and perform inspection before each production run. (3) Material selection: select mold materials with suitable air permeability., establish material selection evaluation standards and determine the optimal plan through comparative tests. (4) Preventive measures: establish a complete process control standard and quality inspection system, and regularly review process data for continuous optimization.

Surface defects are the result of the combined effects of mold condition, process parameters, and material formula, and each factor needs to be systematically investigated and optimized in a targeted manner.