The content of the machining process planning and steps

To calculate parts production platform, determine the type of manufacture. Process analysis was carried out on the parts in the machining process planning of parts make before, should first process analysis was carried out on the parts. The main content includes: ( 1) Analysis of the role of components and parts on the drawing technical requirements. ( 2) Analysis of main parts processing on the surface of the size, shape and position accuracy, surface roughness and design basis; ( 3) Analysis of parts material, heat treatment and machining technology. Determine the variety and quality of casting blank parts processing quality, productivity, material consumption and processing costs have close relationship. The blank should be selected to the complexity of the production batch size, parts, processing surface and the technical requirements and so on comprehensive consideration on the surface of the processing. Correct selection of blank making way, we can make the process more economic and reasonable, therefore, should be treated with caution. Under normal circumstances, should be mainly to produce type to decide. Making parts machining process route ( 1) Determine the surface processing methods. In understand the characteristics of the various processing methods and mastering its machining accuracy and surface roughness, on the basis of economic choice to ensure machining quality, productivity and economic method. ( 2) Select the locating datum. According to the coarse and fine benchmark selection principle of reasonable positioning of each process selected benchmark. ( 3) Making process is obtained. , on the basis of the analysis of parts, divided into parts coarse, semi finished, finishing stage, the concentration and dispersion degree, and determined the process on the surface of the reasonable arrangement of the processing order, thus developed parts machining process route. For more complex parts, we can consider a few plan, after analysis and comparison, and then select a reasonable processing scheme. 5. Determine the machining allowance of each process and procedure dimension and its tolerance. 6. Select machine tools and worker, clamp, quantity and cutters. Mechanical equipment should be selected to ensure that the processing quality, and to the economic and reasonable. Under the condition of batch production, the general should be universal machine tools and special tooling. 7. To determine the main process of technical requirements and test methods. 8. Determine the cutting dosage and time quota of each process. Sheet small batch production, cutting dosage is much by the operator to decide on their own, in the machining process card in general do not make that clear. In the batch, especially in the mass production, in order to ensure the rationality of the production and the rhythm of equilibrium, cutting dosage, the requirements that must be and do not get optional change.