The Research Of Automatic Programming For6-axis Belt Grinding For Large Blades

Blade surfaces are the center components for steam turbine, aero engine, nuclearpower generators and other critical power plants. The machining accuracy of the surfacehas a decisive impact on these power plants. After milling blade type parts, in order toeliminate the marks left by milling and ensure accuracy, it also needs grinding andpolishing to achieve a better surface quality. As the grinding finishing technology of bladeis relatively backward in China, manufacturing is inefficient, and the accuracy ofmachining is not guaranteed.According to blade uneven and grinding allowance, low precision, positioningdifficulties and other issues, this paper through analysis of leaf surface machiningcharacteristics, researches on the belt material and contact wheels, combined with thecharacteristics of six-axis grinding machine and developed a belt grinding technologyprograms to effectively address the grinding process benchmarking, control leaf distortionand other issues.According to the low grinding efficiency and leaf deformation problem, combinedwith the research of belt grinding and geometric characteristic of blade, a new spiralmachining tool path planning method of belt grinding for blade is provided in this paper,which avoided the tool raise knife during grinding process, and greatly reduce the grindingtime, also reduced the production costs. The tool path in a surface area of the transitionwill not have a sharp change, which is a continuous and smooth, effectively solved theblade deformation problems. In addition, the generated tool path is also suitable for highspeed machining.According to the existence of geometric error problems in the Belt grinding machinetool, in the study of arbitrary topology model of the machine body, the kinematical modeland solution method, based on the geometric error of machine tool structure into account,and to compensate for geometric errors of machine tools is proposed compensate forgeometric errors of machine tool structure and kinematical model solution, and finally tocompensate for the geometric error of machine tool structure post-processing method wasapplied to six-axis belt grinding machine tools, to improve the accuracy of post-processing to ensure NC of accuracy.Finally, with the ACIS as geometry engine, with HOOPS as the display engine, withthe VC as a development platform, developed a large blade automatic programmingsystem of a large blade for CNC machining, abrasive belt grinding the blade to achieve atrajectory planning, generation and machining simulation, and have been used in practicefor a long time, its machining effect is good.