Research On The Technology Of High Speed Milling Al-Alloy

High-speed cutting technology, as a new machining technology, is bringing a sort of revolutionary changes to the traditional theory of metal cutting and the machining technology, this technology can improve the product quality and reduce the product cost very much, and it also can promote the enterprises competing dominance in the world market, therefore, it has distinct economy benefit and widely developing future. With the widely applying of high-speed machine tools and high-speed cutting tools in the aerospace, automobile and mould industries, high-speed cutting technology will be one of the important symbols of measuring the level of advanced machining technology of a country. To improve the level of high-speed cutting technology and to realize the goal of developing the machining industries with the advanced machining technology in our country, as a part of the research of the task "the research on mechanism and developing high-speed cutting technology"which is also the part of Heilongjiang major brainstorming program " the research on developing and producing the series of modern cutting tools for big and complex parts", this paper, aiming at the characteristics of complex curved surface of high strength AL-alloy and basing on the achievements of CAD/CAM and high-speed cutting technology, has fulfilled the study of the machining technology of high-speed milling AL-alloy.In this work, the main factors, such as the feedrate, cutting speed and feed direction, are analyzed to see how them influence on the surface roughness in high-speed ball-end milling AL-alloy experiments, and a calculating formula of the remnant height is deduced. The experimental results also show that there is a definite significance to guide how to choose milling parameters and tool paths.The AL-alloy deformation rule and the cutting force are studied in high-speed ball-end milling of curved surface; in this case, the cutting forces model is established by means of microelements. Through the theory analysis and experiment studies, the relationship of the curvature of machined surface and cutting forces is developed, and these establish the basis for choosing the tool path of high-speed cutting.In machining process of vertical ball-end milling, the angle between the cutting tool axis and the normal of curved surface of workpiece is important to the surface quality of workpiece and the life of cutting tool. Through theoretical study on the inclination angle, adjusting this angle can improve the tool performance very efficiently, and the mathematical model of cutting tool and the function relationship between the curvature of machined surface and this angle is developed in the process of machining the curved surface; Through the experiments, the rule how the inclination angle influences on the surface roughness and cutting forces can be observed. Accordingly, the evidences for reasonable setting the inclination angle of cutting tool are provided for machining program under the multi-axle numerical control.The demand for cutting tool path is studied in the process of high-speed cutting. In case of fluctuating cutting force, the high-speed milling experiments are carried out to seek the optimal tool path, then the program strategy is put forward concerning with the form characteristics of machining surface.