1. Process division. Parts processed on CNC machine tools can be more concentrated on the process, and most or all of the processes can be completed in one clamping as much as possible. First, according to the part drawing, consider whether the processed part can complete the processing of the entire part on the CNC machine tool. If not, decide which part is to be machined on the CNC machine and which part is to be machined on other machine tools. The processing steps are separated.
2. Division of work steps
The division of work steps is mainly considered from two aspects: processing accuracy and efficiency. It is often necessary to use different tools and cutting amounts to process different surfaces in one operation. To facilitate the analysis and description of more complex procedures, the procedure is subdivided into steps. The following takes a machining center as an example to illustrate the principle of dividing work steps:
1) Rough machining, semi-finishing and finishing of the same surface are completed in sequence, or all processed surfaces are processed separately by roughing and finishing.
2) For parts with both milling and boring, the surface can be milled first and then bored. This division of process steps can improve hole accuracy. Due to the large cutting force during milling, the workpiece is prone to deformation. The surface is milled and then bored, leaving a recovery time to reduce the impact of deformation on hole accuracy.
3) Divide steps according to tools. The rotation time of some machine tool tables is shorter than the tool change time. It can be divided into steps according to the tool to reduce the number of tool changes and improve processing efficiency.
In short, the division of process steps should be comprehensively considered based on the structural characteristics and technical requirements of specific parts.
