We know that precision machining requires high precision. Precision machining has good rigidity, high manufacturing accuracy, and accurate tool alignment, so it can process parts with high precision requirements. So which parts are suitable for precision machining? Below, our engineers will introduce to you:

Firstly, compared to ordinary lathes, CNC CNC lathes have the function of constant linear speed cutting. Both the end face and the outer circle with different diameters can be processed at the same linear speed, ensuring consistent and relatively small surface roughness values. However, an ordinary lathe has a constant rotational speed, and the cutting speed varies with different diameters. When the material of the workpiece and tool, the finishing allowance, and the tool angle are fixed, the surface roughness depends on the cutting speed and feed speed.

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

CNC precision machining mainly includes processes such as precision turning, precision boring, precision milling, precision grinding, and grinding:

(1) Precision turning and precision boring: Most precision light alloy (aluminum or magnesium alloy, etc.) parts in aircraft are processed using this method. Generally, natural single crystal diamond tools are used, and the arc radius of the blade is less than 0.1 micrometers. When processed on high-precision lathes, surface roughness with an accuracy of 1 micrometer and an average height difference of less than 0.2 micrometers can be obtained, and coordinate accuracy can reach ± 2 micrometers.

(2) Precision milling: used for machining complex shaped aluminum or beryllium alloy structural components, relying on the accuracy of the machine tool's guide rail and spindle to achieve high mutual position accuracy. High speed milling using carefully ground diamond cutting heads can obtain accurate mirror surfaces.

(3) Fine grinding: used for machining shaft or hole parts. Most of these parts are made of hardened steel with high hardness. Most high-precision grinding machine spindles use static or dynamic pressure liquid bearings to ensure high stability. The ultimate accuracy of grinding is not only affected by the stiffness of the machine spindle and bed, but also by factors such as the selection and balance of grinding wheels, the machining accuracy of the workpiece center hole, etc. Fine grinding can achieve a dimensional accuracy of 1 micrometer and an out of roundness of 0.5 micrometers.

(4) Grinding: Using the principle of mutual grinding of mating parts to select and process irregular protrusions on the machined surface, the diameter of abrasive particles, cutting force, and cutting heat can be accurately controlled, making it the most high-precision machining method in precision machining technology. The hydraulic or pneumatic mating parts in the precision servo components of aircraft, as well as the bearing parts of dynamic pressure gyroscope motors, are processed using this method to achieve accuracy of 0.1 or even 0.01 micrometers and micro unevenness of 0.005 micrometers.