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Different CNC precision level processing technology | CNC turning surface roughness


The specific accuracy of CNC can reflect the processing effect of the workpiece, and it is the professional degree of the professional team to evaluate the geometric parameters 

of the processed parts and measure the performance of the CNC machining center. CNC turning, milling, planing, grinding, drilling, boring, what kind of precision level should be 

achieved by different processing techniques?

What level of precision should different CNC machining processes achieve?

The accuracy and error of CNC machining are related to the surface roughness. If the surface roughness is too large, it will be difficult to measure the size accurately and accurately, 

and the dimensional accuracy of the workpiece cannot be guaranteed. Let's take a look at the specific parameter effects:

CNC lathe processing

1. CNC turning

CNC turning is a computer numerical control machining process in which the workpiece rotates and the turning tool moves in a straight line or a curve in a plane to process 

internal and external cylindrical surfaces, end surfaces, conical surfaces, forming surfaces and threads.

- General CNC turning surface roughness is 1.6-0.8 μ M.

- Rough turning: use large depth of cut and high feed to improve efficiency without reducing cutting speed, surface roughness requirement is 20-10μm.

- Semi-finishing and finishing turning: use small cutting speed and high-speed feed, and the surface roughness requirement is 10-0.16 μ M.

- For high-precision CNC lathes: fine-ground diamond turning tools can turn non-ferrous metal workpieces at high speed and precision, with a surface roughness of 0.04-0.01μm, 

also known as "mirror turning".

2. Boring

Boring is an internal cutting technique that uses a boring tool to enlarge a hole or other existing circular profile. The tool used is usually a single-edged boring tool (boring bar). 

Suitable for semi-roughing to finishing.

- The boring accuracy of steel can reach 2.5-0.16 μ M.

- Fine boring accuracy can reach 0.63-0.08 μ M.

3. Milling

CNC milling refers to the machining of stationary workpieces with rotating multi-point cutters on a computer-controlled machine tool, suitable for machining slots, flat surfaces, 

gears, and special features.

- Typical surface roughness for milling is 6.3-1.6 μM.

- Rough milling accuracy: 20-5 μM.

- Semi-finish milling: 10-2.5 μM.

- Finish milling: 6-0.63 μM.

4. Grinder

Grinding is an abrasive processing technology that uses a grinding wheel to cut off excess material on a workpiece. It is widely used in the machinery manufacturing industry, usually for semi-finishing and finishing, and can achieve finishing and precise cutting. Grinding can be controlled to move around a fixed workpiece.

- The surface roughness of grinding is generally 1.25-0.16 μ M.

- The surface roughness of precision grinding is 0.16-0.04 μ M.

- The surface roughness of ultra-precision grinding is 0.04-0.01 μ M.

- Mirror polished surface roughness less than 0.01 μM.