Study On Modeling And Simulation On Cutting Groove Intersections Of Pipes

In recent years, along with the increasingly application of steel struct,5-axis or more complex CNC cutting machine has been gradually used to cut intersecting curves and its groove one time. As cutting path programming and other processing technics very complex, all of such devices need to be equipped with special assistive softwares. At present, although a handful of domestic companies to manufacture such equipment, but compared with foreign there are still a wide gap. CNC cutting equipment behind the level of supporting software technology is an important constraint. Therefore, this paper to be directed against the most common practical application of the circular tube, conical tube and square tube's intersection problem, to launch study on the automatic programming, automatic post-processing, simulation and virtual training technology validation.To make sure the research more universal, all study is based on a full-featured six-axis CNC cutting machine model.Through intersecting curve cutting process with groove conduct sports decomposition for circular tube, conical tube and square tube determine required linkage axis cutting different types of pipe, established mathematical constraints model about move speed between every, linkage axis.On this basis, according to the tube outlined characteristics and space linear fitting needs of intersecting curve's cutting locus, Proposed a kind of calculate methed,convenient gets solution for computer This method first for the head tube and the branch tube establish their own coordinate system, and respectively established parametric equations; then according to the position relationship between the two coordinate systems, established coordinate transformation matrix from branch tube coordinates to main tube coordinates, using coordinate transformation method make branch tube parameter equation is mapped to head tube coordinate system for solve intersecting curve's cutting locus of main tube. At last carry on inverse transformation for getting locus then obtain intersecting curve's cutting locus of. branch tube using this method, established intersecting curve mathematical model of square tube and square tube, square tube and the conical tube, square tube and round tube, conical tube and the conical tube, conical tube and circle tube, circle tube and circle tube.A detailed analysis for pipe cutting error composition is carrid on, the error compensation model is established also. Contrary to the installation error and contour error's compensatory problem, a method of obtaining error using of binocular machine vision technology is proposed, conducted illustrate for error acquisition devices composing and working principle are described, given arithmetic according to reconstructed three-dimensional outline of steel profile through capture continuous image, by adjusting the image acquisition interval, can be easily achieved popose for dynamically adjusted error compensate filter. Another study is concentrated on the structure of simulation module composition of CNC intersecting curve's cutting machine. This module can be used to simulate the NC program and can be used to process a virtual operator training too. According to functional analysis, the virtual simulation module is divided into three major components include virtual machines, virtual actuator and the virtual analyzer of cutting course. Proposed a method about constructing platform-independent virtual intersecting curve's cutting machine quickly. The concrete procedure include using formal grammar and context-free grammar rules to discrib CNC code grammar rule and using these rules to build NC code decoder is brought forward. Formation and operating mechanism of the virtual motion controller are discussed to make simulated cutting process more similar with actual cutting process. The calculation model of virtual cutting torch and cutting wind position are established and the method of increasing the realism of cutting process simulation when using flame cutting technology are studied. In these reserch, a simulation model is established accoding to the chemical analysis of the actual cutting flame. On this basis, the course of producing visual effects cutting flame using particle system is elaborated. Finally, the effects producing technology of burning slag splashing is study preliminary.The study constitutes a entire technology chain that can be used to develop specific supporting software of multi-axis CNC intersection cutting machine. Work on this further in-depth research and improvement can significantly reduce the gap between domestic CNC intersection cutting machine and similar foreign products in the software technology area.