The formulation of the process route is to formulate the overall layout of the process, whether a part is processed well or not, the main task is to select the processing method of each surface, determine the processing sequence of each surface, and the number of processes in the entire process.
1. Process the datum surface first. During the processing of the part, the surface as the positioning reference should be processed first, and the general shape of the part should be processed according to the drawing or the parameters analyzed before. In order to provide a precise benchmark for the subsequent processing as soon as possible. Called "benchmark first."
2. Divide the processing stages. The surface of precision parts with high processing quality requirements is divided into processing stages, so it is very important and complicated. Generally, it can be divided into three stages: rough machining, semi-finishing and finishing. Mainly to ensure the processing quality; facilitate the rational use of equipment; facilitate the arrangement of the heat treatment process; and facilitate the discovery of blank defects.
3. Face first and then hole. For parts such as boxes, shafts and connecting rods, the planes should be processed first and then the holes should be processed. In this way, the holes can be positioned on the plane to ensure the accuracy of the plane and the position of the hole, and the processing of the holes on the plane is convenient. Because the processing plane is relatively simple and the hole is more complicated, it is more reasonable to do the short answer first and then do the complicated one.
4. Finishing processing. Finished workpiece. This is the last step and it is also very important. The finish processing of the main surface (such as grinding processing, honing processing, fine grinding processing\rolling processing, etc.) should be carried out at the last stage of the process route. The surface finish after processing must meet the requirements of the customer, and it must be ensured Place the processed precision parts and strive to be handled with care, because slight collisions will damage the surface. In Japan, Germany, etc., after finishing processing, they must be protected with flannel. Hands or other objects are not allowed. Direct contact with the workpiece to avoid damage to the finished surface due to transfer and installation between processes. After all, it is a precision component, so the requirements of the component are relatively high, and a little superficial error will affect the use of the component.