型腔拐角銑削加工參數優(yōu)化與研究
[Abstract]:Mould is widely used in automobile industry, mobile phone industry, aerospace industry and other fields, so the NC machining accuracy of die is an important research object. Because of the thousands of changes in the shape of the product parts, the shape of the die is very different, especially when the die has more corners, it increases the difficulty of machining. The internal and external transition connections of these angles, such as sharp angle, obtuse angle and so on, make the milling force fluctuation produced by the cutting tool cause the workpiece trembling and the machining efficiency decrease in the milling process. In this paper, the machining efficiency and milling force of plane corner milling are studied. First of all, after consulting the research status at home and abroad, there are three ways to optimize machining at the corner: (1) in the control aspect of NC system, the control mode of NC system, such as the interpolation characteristic of motion trajectory, speed prospective preprocessing, acceleration and deceleration motion control, etc. (2) in the aspect of tool path, the optimal path is considered, and the optimization of tool walking is considered. (3) in terms of process parameters, feed speed, cutting depth and spindle speed are mainly considered. The advantages and disadvantages of the three methods are compared, and the process parameters are adopted in this paper. Secondly, the relationship between the position parameters of milling cutter and workpiece when milling plane corner is analyzed, and the real trajectory of cutter edge in milling process is obtained, and the mathematical expression of the corresponding parameter variables in the process of plane corner milling is given by analyzing its real trajectory. Aiming at the typical corner of die cavity, the contact between milling cutter and workpiece in different stages is analyzed by using plane geometry theory, and the changing trend of instantaneous contact angle between milling cutter and workpiece is obtained, and the instantaneous milling area of cutting edge in the process of corner machining is solved according to the change of instantaneous contact angle, and the formula for calculating the instantaneous milling area of cutter edge is established. Thirdly, the simulation software DEFORM-3D, is used to simulate the designed comparative parameter scheme, and the milling load curve is obtained. according to the fluctuation of the curve, the statistical analysis method is selected, and the abnormal data in the simulation results are eliminated by using the "3 蟽" principle in MATLAB to ensure the reliability of the simulation data. Through the derivation of the functional relationship between milling force, milling cutter torque and feed rate and milling cutter speed, the exponential formula is transformed into a linear formula, which provides a basis for data analysis. Through MATLAB software, the regression analysis of the simulation data is carried out, and the prediction model of milling force and milling torque is obtained, and the reliability of the data is verified by analyzing the linear correlation and linear fitting degree of the data. Finally, the basic theory, form and design flow of particle swarm optimization algorithm (POS) are introduced in detail. According to the basic form of the algorithm, the mathematical model of optimization objective function and constraint conditions is deduced. According to the basic flow, the optimization program is compiled in MATLAB software. The iterative operation results show that the machining time of milling parameters after corner milling optimization is 54.75% and 58.20% less than that of empirical parameter setting.
【學位授予單位】:西安建筑科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG547
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