Process analysis of the influence of high-speed machining cutting parameters on the surface quality of parts

The study believes that in high-speed milling, the feed per tooth, the axial depth of cut and the cutting speed are the most important factors affecting the surface quality of the machining parameters. The higher the cutting speed, the smaller the roughness value of the mattress; the smaller the feed per tooth, the lower the roughness value. In addition, the various vibrations generated by the machining system will also have a great impact on the surface quality, including vibrations caused by the axial depth of cut and the high-speed rotation of the spindle, and the changes in the cutting force during the machining process. Vibration etc.

This article will study the effect of various iron cutting parameters on the surface quality of the processed surface through high-speed milling of hard lead alloy specimens, to analyze the formation mechanism of surface roughness, and provide a certain practical basis for future high-speed milling process research .

Process analysis of influence on surface roughness of parts

The experimental workpiece material is LC4 hard aluminum alloy, the tool is d12 high-speed steel ball end mill, and the cooling method is oil-gas cooling. In the high-speed milling test of hard aluminum alloy, it is based on the changes of cutting parameters such as depth of cut, radial feed, spindle speed and feed speed, and analyzes the measurement results in combination with the actual The processing rules under different cutting parameters, in turn, these rules can effectively guide the actual production. 01.1 The color noise analysis of the cutting depth and the surface roughness. High-speed milling can be used as the finishing process of the product, and the cutting depth is not If the cutting depth is too large, it will produce a large cutting force, and this cutting force is not constant but constantly changing. The change of force will affect the stability of the machine tool during the cutting process and cause vibration. This vibration Acting on the cutting process will affect the quality of the machined surface. During the variable cutting depth milling test of duralumin alloy, it was found that at a larger cutting depth, such as a=1mm, a large number of sparks would be generated during the milling process, accompanied by a violent noise, and the resulting Cutting vibration causes strong vibration of the tool holder system and even the bed. Combined with the actual situation in production, in the duralumin alloy variable cutting depth high-speed truncation machining test, the other milling parameters are: n=20000r/min, V=8000mm min, a=0.08mma. The measured test data are shown in Table 1. Show.

It can be seen from Table 1 that in high-speed truncation processing, as the depth of cut increases, the surface roughness value obtained increases accordingly. The reason is that as the depth of cut increases, each The tooth cutting amount becomes larger, which will produce a relatively large cutting force. This constantly changing cutting force causes greater vibration during the machining process, resulting in a decrease in the quality of the machined surface. This change is not very big, but based on the consideration of cutting heat, vibration and other factors, in the precision milling process, a smaller cutting depth should be selected according to the situation to ensure the overall quality of the machined surface