According to hardware parts processing manufacturers, the cutting amount includes the spindle speed (cutting speed), the amount of back cutting, and the amount of feed. The amount of cutting has a significant impact on cutting force, cutting power, tool wear, processing quality and processing cost. When selecting the cutting amount in CNC machining, it is to give full play to the performance of the machine tool and the cutting performance of the tool under the premise of ensuring the quality of the processing and the durability of the tool, so that the cutting efficiency is the highest and the processing cost is the lowest.
The selection principle of cutting amount is as follows:
①The selection principle of cutting amount during rough machining. First, select the largest possible amount of back-grabbing; secondly, select the largest possible feed rate according to the power and rigidity constraints of the machine tool; finally, determine the best cutting speed according to the durability of the tool.
②The selection principle of cutting amount during finishing. First, determine the amount of back-grabbing according to the margin after roughing; secondly, select a smaller feed amount according to the roughness requirements of the machined surface; finally, on the premise of ensuring the durability of the tool, choose a higher cutting speed as much as possible .
Selection method of cutting amount
①Analysis of hardware parts processing manufacturers, the choice of back-to-back knife aP (mm). According to the machining allowance, it should be as large as possible if the machine tool allows it. When the rigidity of the process system is insufficient or the blank margin is large, or the margin is uneven, the rough machining should be divided into several feeds, and the back-grabbing amount of the first and second feeds should be as large as possible.
②The selection of feed amount (feed speed) f (mm/min or mm/r). The feed rate (feed rate) is an important parameter in the cutting parameters of CNC machine tools. According to the surface roughness of the part, the machining accuracy requirements, the tool and the workpiece material, etc., refer to the cutting amount (tool) manual for selection.