Research Of Automatic Programming System Simulation Technique In Multi-axis Numerically Controlled Machining Complex Curve

With the wide application of CAD/CAM and other related technologies, traditional design and production methods have been thoroughly innovated, which improves the productivity and brings greater technologic and economic benefit. Numerical control (NC) machining simulation is the key technology of CAD/CAM. Geometry simulation technique for machining complex curve surface has important meaning for high precision and surface quality. Based on such a notion, geometry simulation in NC machining complex curve surface is studied in this thesis.A method of using the principle of minimal orientation-distance to calculate cutter-trace is introduced in this thesis. Base on this, geometry character of various milling cutter is analyzed, a generalized milling cutter model in parameter expression is concluded, and curve parameter equation and unity normal vector equation that form double-conical surface and double-toroidal surface are studied. By analyzing basic motion unit in NC machining, the ways that compute relative motion equation of cutter surface and workpiece surface with motion parameters are concluded. On the basis of engagement theory, an algorithm of geometry simulation for machining surface with point-contact envelope method is presented on the condition that cutter positional dates and cutter surface are given. Based on the basic theory of engagement that two velocities of relative motion, which are in the first feed direction and the second feed direction, are normal to normal vector on cutter contact point, the engagement equation of cutter contact point is taken out, therefore the CC points on process surface - geometry simulation points can be evaluated. The algorithm proposed in this thesis take cutter motion parameter in NC Programming as basic information, and the complicated problem of simulating is converted into non-linear equation for solving, thus the simulating process is simplified, it has the better value for spreading commonly machining complex curve surface. At last, the simulating program is complied depending on the algorithm of simulation, and the topic example of calculation is used to validate the simulating method and program in this thesis.hi NC automatic programming system, programming error analysis is processed with geometry simulation tools of machining surface, and high analysis precision can be got. Algorithm of geometry simulation in machining complex curve surface depending on engagement theory is the new exploration for geometry simulation, it has better practical meaning.