What are the steps to clarify the CNC turning programming process?

1. Determine the processing location and specific content of the workpiece

　　①The situation of the workpiece before processing in this process. For example, castings, forgings or bars, shape, size, machining allowance, etc.

　　②The shape and size of the parts processed in the previous process require the datum surface, datum hole, etc. processed in the previous process.

　　③The parts and specific contents to be processed in this process.

　　④In order to facilitate the preparation of processes and procedures, the rough drawing before processing of this process and the processing drawing of this process should be drawn.

　　2. Determine the clamping method of the workpiece and design the fixture

　　Select or design a fixture based on the determined workpiece processing location, positioning reference and clamping requirements. CNC lathes mostly use three-jaw self-centering chucks to clamp workpieces; shaft workpieces can also use tailstock tips to support the workpieces. Due to the extremely high spindle speed of CNC lathes, hydraulic high-speed power chucks are often used to facilitate workpiece clamping. Because they have passed strict balance in the production plant, they have the advantages of high speed (limit speed can reach 4000~6000r/min), high clamping force (maximum push-pull force is 2000~8000N), high precision, easy claw adjustment, through holes, and long service life.

　　Soft claws can also be used to clamp the workpiece. The curved surface of the soft claws is randomly prepared by the operator to achieve ideal clamping accuracy. By adjusting the cylinder pressure, the chuck clamping force can be changed to meet the special needs of clamping various thin-walled and easily deformed workpieces. In order to reduce stress deformation during machining of slender shafts, improve machining accuracy, and when machining the inner hole of shaft workpieces with holes, a hydraulic automatic centering center frame can be used, with a centering accuracy of up to 0.03mm.

　　3. Determine the processing plan

　　Determine the principles for processing plans

　　The machining plan is also called the process plan. The machining plan of the CNC machine tool includes formulating the process, work steps and tool routing.

　　In the process of CNC machine tool processing, due to the complexity and variety of processing objects, especially the ever-changing shapes and positions of contour curves, as well as the influence of various factors such as different materials and different batches, when formulating processing plans for specific parts, specific analysis and differential treatment should be carried out and handled flexibly. Only in this way can the formulated processing plan be reasonable, thereby achieving the goals of excellent quality, high efficiency and low cost.

　　The general principles for formulating a machining plan are: coarse first and then fine, close first and then far, inside first and then outside, with the fewest program segments, the shortest tool path, and special handling of special situations.