Path Control And Optimization Of Micro-abrasive Water Jet Surface Polishing

Special-shaped parts with complex surface features such as blades,molds,propellers,etc.are widely used in aerospace,military,electronics,automobiles,machinery and other fields.Such parts are not only complex in shape,but also have high requirements for surface quality.The path planning method of the curved surface and the control accuracy of the multi-axis motion system are important factors that affect the quality of the final processed surface.Abrasive water jet processing has become one of the main methods for polishing and processing special-shaped parts with complex surface features due to its advantages of good processing flexibility,non-selectivity to materials,and low surface damage.This paper takes the complex curved surface and special-shaped parts as the research object,develops a fine abrasive water jet polishing platform,plans and optimizes its polishing trajectory to improve the machining accuracy and efficiency.The main research contents are as follows.First,take the blade profile polishing as an example to build a test platform for polishing special-shaped parts with fine abrasive water jets.By analyzing the jet structure and jet beam removal model,studying the polishing motion law and material removal characteristics of typical surfaces such as flat,convex and concave surfaces with fine abrasive water jet,the motion requirements of the abrasive water jet polishing processing experimental device were obtained,and the polishing platform motion layout was determined.The plan is the four-dimensional movement of the gantry structure in the form of X-direction lateral movement,Z-direction lifting movement,Y-axis longitudinal movement,and rotation movement of the worktable;based on the requirement of realizing the polishing track,the DSP motion control card is embedded in the PC as the control core to construct The micro-abrasive water jet polishing control system connects servo motors and drivers to form a servo system through closed-loop control,which provides a hardware foundation for the realization of complex curved surface polishing.Then,based on the complex and special-shaped blade surface and cavity surface,the realization scheme of the polishing of the micro-abrasive water jet surface was studied,and the relationship between the height of the residual ridge and the row spacing when the surface was removed by the jet beam was analyzed.With the help of numerical simulation methods,different trajectory planning methods such as The advantages and disadvantages of trajectory planning methods such as parametric line method,triangular mesh surround offset method,flat section projection method and combined path in terms of trajectory length,time-consuming,etc.,obtain the best application occasions for different processing methods.Finally,the design of a software system for surface polishing of micro-abrasive water jet surface,through decoding,image loading and post-processing,design a human-computer interaction interface to preview the surface trajectory of the processed part,which verifies the feasibility of the polishing system.In this paper,the post-processing trajectory is exported in Code Expert for post-processing.The path trajectory is generated by the surround offset method with fewer turns,and the small line segment approaching the trajectory is pre-processed to optimize the movement speed,especially the turning point speed.Smooth processing to reduce the inertial impact of the polishing device,thereby improving the precision and efficiency of polishing processing.