Research On Energy Saving Technology For NC Machining Of Free-form Surface Parts

With the progress of science and technology,China’s machinery industry has achieved a rapid development.In order to meet the needs of industrial development,the shape of mechanical parts are designed more and more complex,and free surface parts are often encountered in the processing and manufacturing industry,it is widely used in aerospace,automobile manufacturing,ship manufacturing and other industries.Due to the variety of curvature changes of free surface parts,complex surface,large amount of removal materials,the processing process becomes more difficult,too long processing time,low efficiency,large energy consumption and other problems.This paper studies the problems of high energy consumption and how to reduce the milling heat of free surface parts.(1)In view of the problems of high energy consumption and difficulty in energy consumption evaluation of free surface parts,the tool processing path is analyzed from the perspective of energy consumption,the tool processing path with the least energy consumption in the machining process is found as the final machining path of free surface parts,so different tool processing paths are evaluated.During the machining process of the free-form surface parts,the walking path of the tool on the part surface requires the participation of many machining institutions,the movement of the processing mechanism requires energy,it needs to analyze the energy consumption source of the machine tool,the study of machine tool in the different processing stages have different cutting condition,Energy consumption sources at different stages were studied to propose a exergy dissipation method,and mathematical modeling of exergy dissipation method was conducted to obtain the calculation model of the method,which was used for comprehensive calculation and evaluation of processing energy consumption.(2)During the machining process of the free-form surface parts,The processing process parameters set by empirical method are the important factors leading to large energy consumption and high milling heat of free surface parts,in order to reduce processing energy consumption and milling heat,the processing process parameters of free surface parts should be optimized.The study will optimize the processing process parameters from both processing energy consumption and milling heat,establish a mathematical model between processing process parameters and energy consumption and a mathematical model between the processing process parameters and the milling heat,the non-dominated sorting genetic algorithm with elite strategy(NSGA-Ⅱ)was used to solve the mathematical model.The analytic hierarchy process(AHP)was used to find the optimal solution of Pareto solution set.Finally,the optimized processing process parameters and the empirical processing process parameters are used for experimental comparative analysis.After the machining of the free surface parts is completed,the de tomoscope S composite coordinate instrument is used to scan and analyze the machining accuracy of the free surface parts.