Turning
The workpiece rotates and the turning tool performs a straight or curved movement in the plane. Turning is generally carried out on a lathe to machine the inner and outer cylindrical faces, end faces, conical faces, forming faces and threads of the workpiece.
The turning precision is generally IT8-IT7, and the surface roughness is 1.6-0.8μm.
1) Roughing is to improve the turning efficiency by using large cutting depth and large feed rate without reducing the cutting speed, but the machining accuracy can only reach IT11, and the surface roughness is Rα20-10μm.
2) Semi-finished and refined cars should adopt high speed and small feed rate and cutting depth as much as possible. The machining accuracy can reach IT10-IT7 and the surface roughness is Rα10-0.16μm.
3) On the high-precision lathe, the fine-grained diamond turning tool high-speed finishing car non-ferrous metal parts can make the machining precision reach IT7-IT5 and the surface roughness is Rα0.04-0.01μm. This turning is called "mirror turning".
Milling
Milling refers to the use of a rotating multi-blade tool to cut a workpiece, which is a highly efficient machining method. Suitable for processing planes, grooves, various forming surfaces (such as splines, gears and threads) and special shapes of the mold. According to the same or opposite direction of the main moving speed direction and the workpiece feeding direction during milling, it is divided into down milling and up milling.
The machining accuracy of milling is generally up to IT8-IT7, and the surface roughness is 6.3-1.6μm.
1) Machining accuracy during rough milling IT11—IT13, surface roughness 5-20μm.
2) Machining accuracy during semi-finishing milling IT8—IT11, surface roughness 2.5-10 μm.
3) Machining accuracy during finishing milling IT16-IT8, surface roughness 0.63-5μm.
Planing
Planing is a cutting method that uses a planer to horizontally reciprocate the workpiece horizontally. It is mainly used for the shape processing of parts.
The precision of planing is generally up to IT9-IT7, and the surface roughness is Ra6.3-1.6μm.
1) The roughing processing precision can reach IT12-IT11, and the surface roughness is 25-12.5μm.
2) The precision of semi-precision machining can reach IT10-IT9, and the surface roughness is 6.2-3.2μm.
3) Precision planing processing can reach IT8-IT7, and the surface roughness is 3.2-1.6μm.
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Post time: Jul-24-2019