Selection of Surface Processing Methods for Tungsten Carbide Bowl

       Selection of surface processing methods for tungsten carbide bowls:

The surface of a part with certain technical requirements can generally not be processed by one process method to meet the design requirements. Therefore, for the surface with higher precision requirements, when selecting the processing method, it is always achieved by various process methods. The final processing method is selected by factors such as processing economic precision and surface roughness, and then the processing method and sequence of the previous series of preparation procedures are selected, and the design requirements are met through successive processing. The economic accuracy of processing in the above factors refers to the processing accuracy that can be guaranteed under normal processing conditions (using equipment that meets quality standards, process equipment, and standard technical level workers, without extending the processing time). Common process methods are shown in Table 2-3~Table 2-6.

The basic idea of selecting the surface processing method of the part is as follows.

①Accuracy and surface quality requirements of the processed surface Generally, the economic accuracy of the processing method used should be able to ensure the accuracy and surface quality requirements specified in the part drawing. For example, the material is carbon steel, the dimensional accuracy is 1T7, the surface roughness R, =0. 8um of the outer cylindrical surface can be achieved by turning and grinding, but because the above-mentioned processing accuracy is the economic precision of grinding, and It is not the economic precision of turning, so the grinding method should be selected as the final processing method to achieve the workpiece processing accuracy. When the processing economic precision of a variety of processing methods can meet the accuracy and surface roughness requirements of the processed surface, the choice of processing method depends on the structural shape, size, material, heat treatment and other factors of the part. For example, a hole with a dimensional accuracy of IT7 can be processed by boring, reaming, grinding, and broaching to meet the accuracy requirements and meet the economic accuracy of processing. However, if it is a hole on the box, broaching and internal grinding should not be selected. Because the box body is processed by broaching and internal grinding, the process is complicated and even impossible to implement, so it is advisable to use boring and reaming processing. For holes with high position accuracy, use coordinate boring or coordinate grinding, because reaming cannot Correct the deviation of the hole position. The size of the processed surface also has a certain influence on the choice of processing method. For example, boring should be used when the diameter of the hole is large. If the reaming is used, the diameter of the dumpling knife will be too large to manufacture and it is inconvenient to use. For processing small diameter holes, it is more appropriate to use reaming, because German cutting of small holes will result in too small diameter of the boring bar, poor rigidity, and it is not easy to ensure the machining accuracy of the hole.

②The nature of the tungsten carbide bowl material and heat treatment requirements. For non-ferrous metal parts with high processing quality requirements, fine car, fine milling or diamond tube is generally used for processing. Pre-grinding processing should be avoided, because non-ferrous metals tend to block the grinding wheel before grinding. The steel parts after quenching should be processed by grinding and special processing.

③The parts processing method selected for production and economic requirements should have the highest possible productivity in addition to ensuring product quality and economic precision requirements. Especially in mass production, high-efficiency advanced processing methods and equipment should be used as much as possible to achieve the goal of greatly improving production efficiency.