We know that precision machining requires high precision, and precision machining has good rigidity, high manufacturing accuracy and accurate tool settings, so it can process high precision parts, so which parts are suitable for precision machining? Let us introduce you to.

First of all, compared with ordinary lathes, CNC lathes have constant linear speed cutting function, no matter for turning end face or different diameter outer circle can be processed with the same linear speed, that is to ensure the surface roughness value is consistent and relatively small. The surface roughness depends on the cutting speed and feed rate under the condition that the material of workpiece and tool, finishing allowance and tool angle are certain. 

When processing surfaces with different roughness, small feed speeds are used for surfaces with small roughness and larger feed speeds are used for surfaces with large roughness, with good variability, which is difficult to achieve on ordinary lathes. Contour shape complex parts, any plane curve can be used straight line or arc, cnc precision machining with arc interpolation function, can process a variety of complex contours of the parts, cnc precision machining of the use of good or bad need to be carefully used by the operator. 

CNC precision machining mainly has fine turning, fine boring, fine milling, fine grinding and grinding processes:.

(1) fine turning and fine boring: most of the precision light alloy (aluminum or magnesium alloy, etc.) parts in the aircraft are mostly processed by this method, generally with natural single crystal diamond tools, the radius of the cutting edge circle is less than 0.1 micron, in the high precision lathe processing can obtain 1 micron accuracy and average height difference of less than 0.2 micron surface unevenness, coordinate accuracy can reach ± 2 micron.

(2) Fine milling: used for machining complex shapes of aluminium or beryllium alloy structural parts, relying on the accuracy of the machine tool's guide and spindle to obtain high mutual position accuracy, using carefully ground diamond tips for high-speed milling can obtain accurate mirror surface.

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

(4) Grinding: Using the principle of mutual research of mating parts to selectively process the irregular raised parts on the machined surface, the grinding grain diameter, cutting force and cutting heat can be precisely controlled, so it is the processing method to obtain the highest precision in precision machining technology. Hydraulic or pneumatic mating parts in precision servo components of aircraft and bearing parts of dynamic gyro motors are machined in this way to achieve an accuracy of 0.1 or even 0.01 microns and a micro-unevenness of 0.005 microns. 

If there are any other aspects you would like to know about, come and consult us.

We know that precision machining requires high precision, and precision machining has good rigidity, high manufacturing accuracy and accurate tool settings, so it can process high precision parts, so which parts are suitable for precision machining? Let us introduce you to.

First of all, compared with ordinary lathes, CNC lathes have constant linear speed cutting function, no matter for turning end face or different diameter outer circle can be processed with the same linear speed, that is to ensure the surface roughness value is consistent and relatively small. The surface roughness depends on the cutting speed and feed rate under the condition that the material of workpiece and tool, finishing allowance and tool angle are certain. 

When processing surfaces with different roughness, small feed speeds are used for surfaces with small roughness and larger feed speeds are used for surfaces with large roughness, with good variability, which is difficult to achieve on ordinary lathes. Contour shape complex parts, any plane curve can be used straight line or arc, cnc precision machining with arc interpolation function, can process a variety of complex contours of the parts, cnc precision machining of the use of good or bad need to be carefully used by the operator. 

CNC precision machining mainly has fine turning, fine boring, fine milling, fine grinding and grinding processes:.

(1) fine turning and fine boring: most of the precision light alloy (aluminum or magnesium alloy, etc.) parts in the aircraft are mostly processed by this method, generally with natural single crystal diamond tools, the radius of the cutting edge circle is less than 0.1 micron, in the high precision lathe processing can obtain 1 micron accuracy and average height difference of less than 0.2 micron surface unevenness, coordinate accuracy can reach ± 2 micron.

(2) Fine milling: used for machining complex shapes of aluminium or beryllium alloy structural parts, relying on the accuracy of the machine tool's guide and spindle to obtain high mutual position accuracy, using carefully ground diamond tips for high-speed milling can obtain accurate mirror surface.

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

(4) Grinding: Using the principle of mutual research of mating parts to selectively process the irregular raised parts on the machined surface, the grinding grain diameter, cutting force and cutting heat can be precisely controlled, so it is the processing method to obtain the highest precision in precision machining technology. Hydraulic or pneumatic mating parts in precision servo components of aircraft and bearing parts of dynamic gyro motors are machined in this way to achieve an accuracy of 0.1 or even 0.01 microns and a micro-unevenness of 0.005 microns. 

If there are any other aspects you would like to know about, come and consult us.