Numerical Control Chasing for Shaft Parts
The numerical control chasing of shaft parts is a process of machining the surface of shaft parts with a CNC machine tool. Generally speaking, it can be divided into two categories: internal and external. The combination of a set of spiral arrangement of cutting tools, to complete the semirefined processing of the inner and outer surfaces of shaft material, has become a more efficient processing method for roughing and finishing geometrically complicated parts such as shafts.
Internal numerical control chasing mainly includes shaft core and wall surface chasing, and external numerical control chasing mainly includes keyway surface, belt surface and complex gear surface chasing. According to the analysis of modern shaft parts processing, firstly, select appropriate multi-station wheel compensation combination to meet the requirements of wheel point distribution, wheel contact surface and wheel coefficient distribution. Since the wheel tool has a limited track range, it is advisable to apply the wheel tool before cutting the wheel surface in the numerical control chasing of the shaft.
Before the numerical control chasing of shaft parts, the appropriate wheel compensation combination should be selected firstly according to the geometric shape of the part. Then use the wheel compensation technique to process the wheel surface in order of minimum circumfluence. The wheel tool will travel along the wheel contact surface when it is operated by the wheel compensation combination. The wheel contact surface must be exquisite because it is dragged directly by the wheel tool. In the numerical control chasing process of the shaft parts, the wheel contact surface dragging must be adjusted in time.
When using multi-station wheel compensation combination to complete the numerical control chasing of shaft parts, turn the wheel tool around the center to make it orbit, and then adjust the cutting amount, pressure angle and cutting speed to complete the wheel processing. It is necessary to pay attention to the chip removal, in addition to the wheel tool, it is necessary to select the corresponding tool for the milling operation of large and small edges in the numerical control chasing of shaft parts. After the wheel processing is completed, small edge processing and cutting are carried out.
The numerical control chasing of shaft parts must ensure the integrity of the wheel processing and the accuracy of the wheel surface. The maximum measurable size error of the wheel surface processing is limited. For example, the average processing curvature error of the wheel surface should be ≤ 0.001mm. During the numerical control chasing of the shaft parts, when the cutting force of the wheel tool is large, it is necessary to select the displacement compensation combination to ensure the accuracy of the wheel processing and the smoothness of the wheel surface.
When using numerical control chasing to process shaft parts, the numerical control system should be able to output all kinds of processed codes, intelligent assists and fault information in time. The operator must have enough understanding of the CNC system and know how to deal with different processing conditions in time. At the same time, it is necessary to debug and adjust the numerical control system to ensure that the accuracy and consistency of the parts to be processed reach the design requirements.
In addition, after the numerical control chasing of shaft parts is completed, in order to ensure its accuracy and performance, in-process and post-process inspection of parts should be carried out, and then processed and corrected according to the results of the inspection. The inspection of the shaft parts is mainly for the geometric accuracy of the parts, the concentricity of the key parts, the accuracy of the key parts and chamfer, and the relative position accuracy of the plastic parts. After the numerical control chasing of the shaft parts is completed, the surface roughness of the parts should be inspected and recorded in detail, to determine the precision requirements of the numerical control chasing.
In conclusion, the numerical control chasing of shaft parts is a process of machining the surface of shaft parts with a CNC machine tool. In the numerical control chasing process of the shaft parts, it is necessary to choose the appropriate wheel compensation combination according to the geometric shape of the part, select the appropriate tool for the milling operation of large and small edges, and debug and adjust the numerical control system to ensure that the accuracy and consistency of the parts reach the design requirements. After the numerical control chasing is completed, the in-process and post-process inspection of the parts should be carried out, and the surface roughness of the parts should be inspected and recorded in detail.
