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How to choose Precision Machining Methold?

Dec. 31, 2019

We know that precision machining has high requirements for precision, precision machining has good rigidity, high manufacturing precision, and accurate tool setting, so it can process parts with high precision requirements. So which parts are suitable for precision machining? The following is introduced by Metal CNC Parts Manufacturer:

CNC Turning Parts

CNC Turning Parts

First of all, compared to ordinary lathes, CNC Turning Parts have a constant line speed cutting function, regardless of the face of the car or the outer diameter of different diameters can be processed at the same line speed, that is to ensure a consistent surface roughness value and relatively small. The ordinary lathe has a constant speed, and the cutting speed varies with the diameter. In the case where the material of the workpiece and the tool, the finishing allowance and the tool angle are constant, the surface roughness depends on the cutting speed and feed speed.

When processing surfaces with different surface roughness, a small feed rate is used for a surface with a small roughness, and a higher feed rate is used for a surface with a high roughness, which has good variability, which is difficult to achieve on ordinary lathes. Complex contoured parts. Any plane curve can be approximated by a straight line or an arc. CNC precision machining has the function of arc interpolation, which can process various complex contour parts. The use of CNC precision machining requires the operator's careful use.

Precision CNC Machined Parts mainly include fine turning, fine boring, fine milling, fine grinding and grinding processes:

(1) Fine-tuning and fine boring: Most precision light alloy (aluminum or magnesium alloy) parts of aircraft are processed by this method. Natural single crystal diamond tools are generally used, and the arc radius of the blade edge is less than 0.1 micron. Machining on a high-precision lathe can achieve 1 micron accuracy and surface unevenness with an average height difference of fewer than 0.2 microns, and coordinate accuracy can reach ± 2 microns.

(2) Fine milling: used for machining aluminum or beryllium alloy structural parts with complex shapes. Relying on the accuracy of the guide and spindle of the machine tool to obtain higher mutual position accuracy. High-speed milling with carefully ground diamond tips for precise mirror surfaces.

(3) Fine grinding: used for machining shaft or hole parts. Most of these parts are made of hardened steel and have high hardness. Most high-precision grinding machine spindles use hydrostatic or dynamic pressure liquid bearings to ensure high stability. In addition to the influence of the rigidity of the machine tool spindle and the bed, the ultimate accuracy of grinding is also related to the selection and balance of the grinding wheel and the machining accuracy of the center hole of the workpiece. Fine grinding can achieve dimensional accuracy of 1 micron and out-of-roundness of 0.5 microns.

(4) Grinding: Selecting and processing irregular raised parts on the surface to be processed using the principle of mutual research of matching parts. Abrasive particle diameter, cutting force and cutting heat can be precisely controlled, so it is the most accurate machining method in precision machining technology.