GB/T 15056-1994 specifies the evaluation method of casting surface roughness. The standard specifies the evaluation principle, which is carried out by comparing with the standard sample or using instrument measurement. Describe the evaluation parameters in detail, such as key indicators such as contour arithmetic average deviation. Specify the evaluation conditions, including measurement environment, measuring instrument accuracy requirements. Give the evaluation process, from the selection of casting surface, the determination of measurement points, to data processing and result judgment. According to this standard, the casting surface roughness can be accurately assessed, providing an important basis for the quality control of casting products and process optimization, and improving the overall mass level of the foundry industry.