I. Introduction
With the economic globalization and the increasingly fierce market competition, the design of the mold is facing a severe test. Die enterprises must use the latest technology, in the shortest possible time to develop high quality, low cost and high added value products, with the fastest speed response and put on the market. Which need to change the traditional mold design method, using the modern product design, mold modern product design technology is based on knowledge of the design, it is necessary to comprehensive utilization of modern management, control, system engineering, simulation, information modeling, artificial intelligence, database and network communication technology, the mold product design process of information flow organic integration, and to simulate the mold of the product in the future performance of the mold, and the whole process of product design, mold manufacturing, so as to make a correct decision and design scheme. Mold product manufacturing is a typical small batch, discrete production. Traditional mold product development from design, manufacture to product launch cycle is too long, design process difficult to and users communicate difficult time to listen to the user's opinion, to consider manufacturability and assemblability, is difficult to fully consider the requirements of safety, maintenance and other aspects, we can not consider production, time and cost mutual constraints limit, not to mention the consider many problems of the whole life cycle of the mold products. Application of CAD technology must be in the mold product drawings all out, in order to communicate with the user. In addition, drawing mold products because of the lack of intuitive, sometimes after the mold manufacturing products can be found many problems, caused by mold products can not meet the user's requirements, not only affects the delivery time, but also increased the cost, sometimes even affect the customer relationship and market share.
Two, mold virtual product design and manufacturing concept
Virtual reality technology is integrated with computer graphics, multimedia, artificial intelligence, network, multi sensor, parallel processing technology, the latest research results. Real time three-dimensional space expression, the operation environment of human computer interaction can bring immersive experience. With the popularity of Internet technology, virtual reality technology will become the mainstream of modern product design technology and standard. The virtual reality technology is the application and Realization of the virtual reality technology in the mould manufacturing. It is the computer mapping reality design environment mould and manufacturing environment, is an important part of virtual manufacturing. Virtual die & mold manufacturing is supported by simulation technology and virtual reality technology, to mold design, processing, assembly, maintenance after unified modeling the formation of virtual environment, virtual process, virtual products.
Three. The structure of the virtual reality system of the mould.
1. Construct the mold product virtual reality system software framework, including modeling, visual simulation, control object, audio space and Networking software. Modeling software is used to define the virtual environment, that is, physical and behavioral characteristics. Visual simulation software for real-time rendering of virtual environment. Object control is a software framework that is used to control object state and virtual environment interaction. Spatial audio software is based on 3D virtual environment generated sound source tools, you can put in with the user in real space corresponding to the position of software. Software using 3D virtual reality software WTK, its powerful function, support various virtual reality input and output tools and equipment, from the most simple mouse to 6 DOF input devices, from computer display to a position tracking stereoscopic head mounted display, users can establish a real-time 3D graphics application system in a short period of time. The hardware including computer graphics system, display, position / orientation tracker, 3D (Liu Wei) input device and stereo generator. Computer graphics system with real-time visual simulation; position / orientation tracker has when information is input to the application, used to track the head, hand tools, the position and the orientation of the function; 3D (Liu Wei) input device allows the user to interact with the application, or virtual space objects.
2. The virtual die product system concrete realization technology route using WTK good object-oriented virtual development environment, to set up the mold virtual product device instance, display settings, collision detection and loading geometry file object, dynamic generation of geometric objects, provisions object behavior and control of shading dyeing. The above 1000 C language function from the outside to the inside, more than 20 classes completed. In the windows system under the environment of VC + + and by using WTK and graphics library for the development, from the lower level control to the creation of a virtual development environment, in WTKR9 by Wtvrm12.dll calls the virtual reality modeling language VRML 2, so as to realize the integrated development of high-level and ObjectARX to create. Function call method: Wtobject-type-founction-to-do. With add to join the simulation cycle; with Wtsensor-new (... To create a sensor with "universe" management; simulation; product geometric objects and sensor objects including U-NIVERSE ". The geometric object of the product is modeled by CAD system, and the object is stored in DXF or WTK file. By using WTK object provides viewpofnt and allows the user to set some of the products observed parameters, multi view to observe the virtual scene, and tracking using sensor's dynamic changing our point of view.
3.WrK virtual environment VRMI and CAD Integrated 3D CAD mold design products, mold products, 3D graphics directly into format VRML2.0. Design personnel as long as the composition of the various parts of the mold products are connected together by VRML sentences are organically, can complete interactive 3D graphics program design of mold products. On the basis of the current CAD system, the CAD data model is converted to virtual
