Compared with clay sand, the appearance quality of resin sand castings depends on the quality of the mold, so resin sand has higher requirements for mold quality. The mold process makes it better adapt to the needs of resin sand molding, mainly in the following aspects:
Machining allowance: The hardened resin sand casting has good rigidity and high dimensional accuracy, and is not easy to deform. Therefore, when selecting process parameters, a smaller machining allowance can be selected to reduce the consumption of metal solution and the cost of machining, thereby improving the dimensional accuracy of the casting.
Draft angle: Resin sand has a certain hardening strength, small yield, and large friction when demolding. If the mold is demolded by knocking, it is easy to damage the mold. At the same time, the repairability of resin sand is poor. If it is damaged during demolding, it is difficult to repair. When using resin sand molding, the draft angle of the mold should be increased according to the actual production and product structure, so that the mold can be smoothly demolded and the quality can be obtained. As the market's requirements for the appearance quality of castings continue to increase, the quality advantages of resin sand castings will be increasingly valued, and the resin sand casting production process will also be rapidly developed and popularized.
Surface roughness of the mold: The roughness of the mold surface plays a decisive role in the surface roughness of the resin sand casting. Therefore, minimizing the surface roughness of the mold is an important measure to obtain high-quality castings.