How to improve the surface roughness of gray cast iron parts?

For gray cast iron castings, surface finish is an important indicator for evaluating the quality of the casting's surface. The surface roughness of gray cast iron castings not only directly affects whether the casting looks refined, but also influences the service life of the gray cast iron. Therefore, improving the smoothness of castings during the casting production process is essential. Generally, gray cast iron manufacturers use the following methods to enhance the smoothness of gray cast iron.

1. The impact of machine tools on the surface roughness of gray cast iron castings. During the production of gray castings, if the rigidity and spindle accuracy of the machine tool are poor, it can lead to unstable machine fixing, meaning that the various components of the machine tool cannot cooperate effectively during production. As a result, the surface smoothness of gray iron castings is difficult to ensure.

2. The impact of cutting tools on the surface roughness of gray cast iron parts. The choice of tool material, determination of tool geometry parameters, and tool wear can all affect the roughness of gray cast iron castings. Normally, using CBN tools made of BNK30 material, maintaining good tool rigidity, choosing a larger nose radius whenever possible, and regularly replacing tools are all beneficial for improving the surface smoothness of gray cast iron castings.

3. The impact of cutting parameters on the surface roughness of gray cast iron parts. Different cutting parameters have varying effects on the surface roughness of gray cast iron castings. During the finishing of gray cast iron parts, cutting parameters should primarily ensure the surface roughness of the gray cast iron parts, while also considering productivity and necessary tool life.

Typically, gray cast iron manufacturers take measures in three areas—machine tools, cutting tools, and cutting parameters—to improve the surface roughness of gray cast iron castings.