Machining accuracy refers to the degree of conformity between the actual geometric parameters (size, shape and position) of the part after machining and the ideal geometric parameters. The machining accuracy is mainly used to indicate the fineness of the workpiece. The machining accuracy is measured by the tolerance level. The smaller the level, the higher the precision. There are 20 tolerance levels from IT01, IT0, IT1, IT2, IT3 to IT18. , among which IT01 indicates that the machining accuracy of the part is the highest, and IT18 indicates that the machining accuracy of the part is the lowest. Then in the machining process, the machining method and the scope of application are different, so the level of the machining accuracy is also different. Dongguan machining and you will understand the classification of various types of machining accuracy.

First, the accuracy level of turning

1. Rough turning has a large cutting depth and large feed to improve the turning efficiency, so the machining accuracy can only reach IT11, and the surface roughness is 20-10 μm.

2. Due to the high speed and small feed and depth of cut for semi-finishing and finishing, the machining accuracy can reach IT10-IT7, and the surface roughness is 10-0.16μm.

3. High-precision turning The high-speed precision turning of non-ferrous metal parts with finely ground diamond turning tools can make the machining accuracy reach IT7-IT5, and the surface roughness is 0.04-0.01μm.

Second, the accuracy level of milling

1. The machining accuracy of rough milling is IT11-IT13, and the surface roughness is 5-20μm.

2. The machining accuracy of semi-finish milling is IT8-IT11, and the surface roughness is 2.5-10μm.

3. The machining accuracy of fine milling is IT16-IT8, and the surface roughness is 0.63-5μm.

3. The accuracy level of planing processing

1. The rough planing accuracy can reach IT12-IT11, and the surface roughness is 25-12.5μm.

2. The machining accuracy of semi-finishing can reach IT10-IT9, and the surface roughness is 6.2-3.2μm.

3. The finishing precision can reach IT8-IT7, and the surface roughness is 3.2-1.6μm.

Fourth, the precision level of grinding

1. The surface roughness of precision grinding is 0.16-0.04μm.

2. The surface roughness of ultra-precision grinding is 0.04-0.01μm.

3. The surface roughness of mirror grinding can reach below 0.01μm.

5. Precision grade of drilling

The machining accuracy of drilling is low, generally only reaching IT10, and the surface roughness is generally 12.5-6.3 μm. After drilling, reaming and reaming are often used for semi-finishing and finishing.

Sixth, the accuracy level of boring processing

1. The boring accuracy of steel materials can generally reach IT9-IT7, and the surface roughness is 2.5-0.16μm.

2. The machining accuracy of precision boring can reach IT7-IT6, and the surface roughness is 0.63-0.08μm.

The above is the classification of machining accuracy of six common machining methods. Yuntuo large-scale machining factory follows the five principles of improving machining accuracy, and adopts advanced machining equipment and machining level to improve the machining quality of workpieces.