The Design And Realization Of Graphic Simulation System For Wire Bending

The precision and quality of wire bending products and the cost of production depends on the functional features of CNC bending machine. Therefore, advanced CNC wire bending machine is important guarantee for rapid and high-precision wire bending processing. Although the research on CNC wire bending processing started late in China, it has made some strides, However, there are large gaps between the domestic and foreign in comparison. At present, the domestic upscale wire bending machine mainly relies on import, which is expensive and not open to the public.Numerical control system is the important component of CNC wire bending machine, while algorithms of the wire bending process and research on graphic system is one of the key points. The paper presents a modular development approach of wire bending graphic simulation system based on the design of wire forming process, which combines OpenGL programming with the theory of computer graphics.Several aspects of research have been done on the design of graphic simulation system:Firstly, on the basis of the research in mechanical structure,3D sculpting technology, the theory of computer graphics, OpenGL programming and the data structure, the decomposition of product structure and storage for graphic data has been completed, and achieve a convenient sectional3D geometric modeling method has been achieved. Furthermore, the machine model has been built by the construction of kinematic relation.Secondly, research on the analysis of bending equipment structure and drawing method was studied. And according to the different diameter of wire, the parameterized modeling for bender and rotating pedestal has unified the simulated environment and the actual machining environment. With the design specifications of parameters being build, a simpler and more efficient modeling method was proposed. Thirdly, the process calculation of bending and tube bending has been completed. And control compensation of the plane variable radius bending production has been improved by studying the research of wire bending forming process.Finally, through the analysis of the functional relation between graphic simulation system and NC system, simulating processing procedure and environment rendering flows has been designed. And modular graphic simulation system and a human-machine interface has been developed. At last, based on the theory of oriented bounding box, the realization of collision detection between wire product and machine parts has been realized.