Feed Rate Optimization For Five-axis Rough Machining Based On Constraints From Spindle Power And The Feed Drive System

When using five-axis machine tools to do the large production of milling part,rough machining is an important part,accounting for a large part of the entire processing time.In the traditional process design modes,the setting of the feed rate is generally conservative to protect the machine tools and the cutting tools,unable to give full play to the potential of machine tools and cutting tools.In view of the above problems,this thesis proposes a feed rate optimization method for five-axis rough milling.This method establishes a five-axis feed rate optimization model through the response data of the process system and the kinematic analysis of each axis.The solution of the model realizes the optimization of the feed rate,and finally reducing the processing time.The contents are as follows:A mathematical model for optimizing the feed rate of five-axis rough milling is established.First,through theoretical analysis and experiments,the consistency of the cutting force and spindle power in reflecting the load changes during the cutting process is verified,and then the instruction domain analysis method is used to establish the constraint of feed rate based on the cutting process load in the optimization model.A general form based on the cubic B-spline feed rate curve is established,and the axis kinematics constraints of the optimization model are established based on B-spline form.Finally,a feed rate optimization model aiming at improve the processing efficiency is formed.Based on the feed rate optimization model,an optimization algorithm based on genetic algorithm and an optimization algorithm based on linear programming are proposed.The traditional GA algorithm is combined with the actual problem to improve the solution efficiency of the algorithm;the kinematic constraints of the feed axis is linearized,so that the feed speed optimization problem can be solved by the linear programming method,reducing the time of solution.According to the feed rate optimization method proposed in this thesis,the feed rate is optimized for the rough machining of an impeller.From the result of experiment,the feasibility of the method proposed in this paper is verified by the analysis of the experimental results.