1. Turning is mainly used for machining rotating parts and machining internal and external cylindrical surfaces, end surfaces, tapered surfaces, forming surfaces and threads of the workpiece. Rotating parts generally include end surfaces, internal hole surfaces, external cylindrical surfaces and grooves, etc. .d.
2. The dimensional accuracy mainly depends on the precision of machine tools and cutting tools. The maximum tolerance accuracy is controlled at 0.001mm, and most machine tools are controlled at 0.01mm. The surface roughness is up to 0.8 microns, and most of them are - 1.25 microns. .
(1) In rough turning, it is necessary to use large depth of cut and large feed to improve the turning efficiency without reducing the cutting speed, but the processing precision can only reach IT11, and the surface roughness is R 20 ~ 10 microns.
(2) For semi-finishing and finishing turning, try to use high speed, smaller feed and cutting depth. The machining precision can reach IT10~7, and the surface roughness can be R 10~0.16 microns.
(3) High-speed precision machining of non-ferrous metal parts using fine-ground diamond turning tools on high-precision lathes can achieve processing accuracy IT7 ~ 5 and surface roughness R 0.04 ~ 0.01 microns.