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Quality Control of Wax Models in Investment Casting

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2019-08-27

Investment casting is mainly composed of mold manufacturing, wax mold manufacturing, shell manufacturing and subsequent drying, roasting, pouring, solidification and other processes. Wax mold is used to form the pattern of casting cavity. To obtain castings with high dimensional accuracy and surface finish, first the wax mold itself should have high dimensional accuracy and surface finish. However, the factors that affect the dimensional accuracy of the wax mold during the wax mold manufacturing process are more complicated, and there are many process parameters, so the dimensional accuracy of the wax mold varies widely. In addition, the performance of the wax mold itself should be as easy as possible to make the subsequent shell making and other processes simple and easy. In order to obtain a high-quality wax mold, in addition to a good press (the mold for pressing the wax mold), a suitable molding material (abbreviated as the mold material) and a reasonable molding process must be selected.

1. The influence of impurities in the mold material on the quality of the wax mold

In the production process of investment precision casting, if the mold material is not properly filtered, it is easy to mix moisture or impurities into the mold material, resulting in defects in the final wax mold. If the moisture mixed in the mold material is not completely removed and enters the mold, the wax mold contains a certain amount of moisture, the surface quality of the wax mold is extremely poor, and there are holes in the interior, which seriously affects the strength and pass rate of the wax mold. The defects are shown in the figure. . If the mold material is mixed with solid impurities such as sand particles, it will float on the surface of the wax mold when making the mold, thereby forming defects such as sticky sand or pits on the surface of the casting, as shown in the figure.


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