Tool life is closely related to the amount of cutting. When setting the amount of cutting, you should first choose a reasonable tool life, and a reasonable tool life should be based on the optimization goal. Generally, it is divided into the highest productivity tool life and the lowest cost tool life. The former is determined according to the goal of the least piece of work, and the latter is determined according to the goal of the lowest process cost.
The following points can be considered when selecting the tool life based on tool complexity, manufacturing and sharpening costs. Complex and high precision tool life should be chosen to be higher than single-edged tools. For the machine clamp indexable tool, due to the short tool change time, in order to give full play to its cutting performance and improve production efficiency, the tool life can be selected to be lower, generally taking 15-30min. For multi-tool machines, combination machine tools and automatic machining tools with complicated tools, tool changes and tool adjustments, the tool life should be selected higher, especially for tool reliability. When the productivity of a certain process in the workshop limits the productivity of the entire workshop, the tool life of the process should be selected to be lower. When the total plant expenditure is shared in a certain process per unit time, the tool life should also be selected. Lower. In the case of large-scale finishing, in order to ensure that at least one pass is completed and the tool is changed midway during cutting, the tool life should be determined according to the accuracy of the part and the surface roughness. Compared with the ordinary machine tool processing method, CNC machining puts higher requirements on the tool, which not only needs good quality, high precision, but also requires dimensional stability and high durability. The break and row performance performance also requires easy installation and adjustment. Meet the high efficiency requirements of CNC machine tools. The tools selected for CNC machine tools often use tool materials that are suitable for high-speed cutting (such as high-speed steel, ultra-fine-grained carbide) and use indexable inserts.