Research On Efficient CNC Machining Method For Double-column Coherent Equal-width Bevels

The double column coherent structure is widely used in the petrochemical industry and other industries,and the quality of the connection is crucial to the life and safety of the pipe work.The bevel structure plays an important role in ensuring the strength and quality of the component connection,and the efficient and accurate processing of the bevel is a prerequisite for the automation of the subsequent welding process and for ensuring the quality of the weld.Equal-width bevels ensure consistent widths in all areas of the weld,reducing flux consumption while maintaining weld strength.This paper investigates the efficient machining of double-column coherent and equal-width bevel surfaces.Based on the structural characteristics of the double-column coherent equal wide bevel surface,a mathematical model is established to characterize the structure;through analyzing the machining requirements of the double-column coherent equal wide bevel surface,a tool position generation method is proposed to meet the machining requirements;in order to achieve efficient machining of the bevel,a milling simulation is conducted and an empirical model between the milling parameters and the milling force is established,and the milling parameters are optimized accordingly;Finally,the feasibility of the machining solution is verified by simulation machining.The chief research substances and results of this study are as follows:(1)Based on the geometric formation principle of double-column coherent equal-width bevel surface,analytic geometry is used to establish the parametric equations satisfied by the points on the boundary curve of the equal-width bevel surface,and the reconstruction of the equal-width bevel curve is realized by Bsample method.According to the characteristics of the equal-width bevel is a straight surface,connecting the parametric points of the boundary curve of the double-column coherent equal-width bevel forms the bus of the straight surface,and then realizes the reconstruction of the double-column related equal-width bevel surface and establishes the mathematical model of the double-column coherent equal-width bevel surface.The mathematical model is constructed to lay the foundation for the subsequent research.(2)By analyzing the structural characteristics of double column intersecting equal width groove surfaces,determine the cutting motion required for surface machining,and then determine the machine type;According to the processing requirement of equal width of the surface,a tool planning method that can realize the theoretical error of 0 on the boundary curve of the bevel surface is proposed,and the calculation method of the theoretical error of tool position is proposed for this method,and the analytical calculati on of the theoretical error of tool position is realized.Finally,the feasibility of the tool position generation method is verified by example.(3)The finite element simulation software ABAQUS was used to perform single-factor and orthogonal milling simulation tests on Q345 steel,and the milling simulation results were processed to establish the empirical equations between milling parameters and milling forces for Q345 steel,and the multi-objective particle swarm optimization algorithm was applied to optimize the milling parameters with the maximum material removal rate and the minimum milling force as the objective functions.(4)Using the tool position generation method and the optimized cutting parameters to generate the tool position file,the tool position file is postprocessed to generate a CNC program that conforms to the machine tool used;The simulation environment of the bevel surface is set up in VERICUT simulation software to verify the reasonableness and feasibility of the proposed machining solution based on the error distribution and size of the simulation machining of the bevel surface.The research on the CNC machining method of double-column coherent and equal-width bevel surface in this paper provides technical support for the development of special CNC machine tools for related enterprises,and provides a certain reference for the research of CNC machining of complex surfaces.