Milling refers to the use of rotating multi-edge tools to cut workpieces, and is a highly efficient processing method. This kind of turning is called “mirror turning “. The turning precision is generally IT8-IT7, and the surface roughness is 1.6-0.8μm.ġ) Rough turning strives to use large cutting depth and large feed to improve turning efficiency without reducing the cutting speed, but the machining accuracy can only reach IT11, and the surface roughness is Rα20-10μm.Ģ) The semi-finish turning and finishing turning should use high-speed and small feed and cutting depth as far as possible, the machining accuracy can reach IT10-IT7, and the surface roughness is Rα10-0.16μm.ģ) High-speed precision turning of non-ferrous metal parts with finely-refined diamond turning tools on high-precision lathes can make the machining accuracy reach IT7-IT5, and the surface roughness is Rα0.04-0.01μm. Turning is generally performed on a lathe to process the inner and outer cylindrical surfaces, end surfaces, conical surfaces, forming surfaces and threads of the workpiece. The workpiece rotates, and the turning tool performs cutting processing of linear or curved movement in the plane. This paper introduces the machining accuracy that can be achieved by turning, milling, planing, grinding, drilling and boring. According to the different functions of product parts, the processing precision required is different, and the processing form and processing technology are also different. The general industrial and mining machinery belongs to it7, and the general agricultural machinery belongs to it8. Among them, IT01 represents the highest machining accuracy of the part, and it18 represents the lowest machining accuracy of the part. There are 20 tolerance grades from IT01, IT0, IT 1, IT 2, IT 3 to IT18. The smaller the grade value is, the higher the accuracy is. Machining accuracy is measured by tolerance grade. Machining accuracy is mainly used to characterize the fineness of products, and it is a term to evaluate the geometric parameters of machined surface.
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January 2023
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