Research For Key Construction Technology In Virtual Machining Environment

The technology of virtual machining is the reflection of numerical controlling machine tool in the virtual environment, it make the manufacturing technology, the numerical controlling theory of machine tool, the Computer Aided Design (CAD), the Computer Aided Manufacture (CAM), the technology of modeling and simulation into a whole system. The people can feel the virtual environment of 3D simulative model produced by computer depending on instinct; the process of virtual manufacturing provides key data to analyze the producibility of product design. In the real process of numerical controlling machining, it is necessary to try cutting repeatedly until we can affirm that the numerical controlling code can accomplish scheduled machining task in order to verify the validity of the numerical controlling code. At the same time, numerical controlling machining parameter needs also to debug repeatedly, these operations not only have lower efficiency and occupy the machine resource, but also have the possibility to make the tool collision and interference and other problems. The process of virtual manufacturing can save the resources and avoid risk. The benefit of the process of virtual manufacturing also shows that it can train the operators of machine tool through simulating really the machine tool's machining process, and help the machine tool's manufacturer to demonstrate realistically their products to latent long-distance clients. The using of virtual manufacturing technology can shorten period of the product's development, lower the production cost, advance product's quality and producing efficiency. With the developing of the science and technology, virtual machining willbring into play great roles in the virtual manufacturing.The paper studies the configuration and key technology of the virtual machining environment from the point of view of virtual product's machinability, and develops one archetypal system of three-dimensions virtual machining environment; the equipment unit among the system is a virtual milling-machining center. When the system is running driven by the NC code, it can change continuously the angle of view in the process of machining to observe the parts moving of the machining center and the molding procedure of the part and model-cavity. The effect of simulating of this archetypal system is excellence and better real time; the archetypal system can be used to verify the machinability to the designed virtual prototype of products.Basing on studying internal virtual machine tool technology, the author researches the visibility to the numerical controlling machining process, the algorithm research of setup of the virtual machine environment, optimization module of the trace of the tool and calculation of the tool position, the translation and achievement of NC-code. And focus on the algorithm research of the translation and achievement of NC-code, and has summed up a set of actualizing scheme of virtual machining technology. Taking Windows 98 as the development platform and using C++ software and 3D Graphical software standard interface OpenGL as tools. This system designs basically the whole virtual machining process. The modules of the system including:1. Virtual machining environment: virtual machining environment is made up of machine tool, workpiece, cutter and clamp, and uses OpenGL and CAD to carry through the feature modeling to machine tool, workpiece, cutter and clamp. II2. Virtual machining process: this module includes the NC program coding, the 3D animation simulation. The numerical controlling machining process simulation mainly is geometry simulation. The geometry simulation looks the cutter and parts as rigid body, not considers cutting parameter, cutting force and other factors' influence to cutting machining, only translates numerical controlling program, gives birth to the cutting position's data, and uses these data to drive machine tool's moving parts, the tool cuts workpiece in virtual environment.