High-speed Machining Surface Roughness

High-speed cutting machining (HSM) technology, based on the high efficiency and the high accuracy, is one of the advanced manufacture technologies, which has rapidly developed for more than 20 years. HSM has the extremely high production efficiency, and can remarkably improve the processing components quality.However, there still are many factors, which restrict the further development and the widespread application of HSM technology. As a new cutting idea, the HSM does not have the systemic choice plan of cutting tool material in HSM, and also does not have the integrated processing parameter to be chosen until now.The choice of cutting parameters, when high-speed cutting processing, mainly depended on the workers experience, or carried on massive cutting trials, resulting in the huge waste. The present main questions of HSM applications are how to reasonably choose the cutting tool materials, which match with the work piece materials, and the reasonable machining craft parameters, in order to obtain the best surface quality, to lengthen the cutting tool life, to enhance the productivity, and to reduce the product costs.By research on the key technologies of HSM, this paper theoretically analyzes and summarizes the existing tool materials, which are suitable for HSM. And according to the match principles of cutting tool materials and work piece materials, mainly included dynamics performance, physical performance and chemistry performance, point out the cutting tool materials, which are suitable for high speed to process each kind of work piece materials. This article takes cast iron as the example, chooses the cutting tool (Mapel Corporation's CBN cutting tool), which matches with cast iron. Based on the principle of orthogonal experimental design, do the research on the surface roughness when high-speed milling cast iron with CBN. Select the reasonable machining craft parameters (including cutting speed, depth of cut and feed rate) as the experimental factors, make use of the range analytical method to analyze the trialresults, and point out the primary and secondary influence order of each factor to the surface roughness, and determine the most superior cutting condition. And use the analysis of variance (ANOVA) principle to determine which cutting parameters significantly affect the surface roughness. According to ANOVA table, carry on significant test to the factors, and come into being the confidence and the confidence interval. Again use the analysis of regression method, establish the forecast model of surface roughness, and carry on significant test to the regression equation and the coefficient of this model. This model can forecast the surface roughness when high speed milling.Finally, according to the confirmation experiment, conclude certain rules. That is along with the enhancement of cutting speed, the surface roughness reduce;but increase the feed rate, cause the surface roughness increase. The research on surface roughness of high-speed milling workpieces can provide the basis of enhancing the surface quality and cutting tool life, and reducing the cutting tool cost, and can impel the development and the application of HSM technology in China.