Design quality assurance technology in virtual environment (Figure)

With the rapid development of the world economy and the globalization of the market, the competition among enterprises is becoming more and more fierce, and the main indicators of the competitiveness of enterprises are the time period (Time), quality (quality) and cost of new product development. Cost), and the corresponding service (Service), that is, TQCS. Therefore, reducing product costs, improving product quality, and shortening the product development cycle have become the key to the survival and development of enterprises.

As an important part of the product life cycle, the importance of the design phase is clearly reflected in practice, as shown in Figure 1.

It can be seen that the design cost is generally between 70% and 80%. The design of the product should be paid more and more attention. The quality of the design not only affects the cost of the product but also determines the quality and performance of the product. Therefore, in recent years, manufacturers in developed countries have shifted the focus of quality assurance from the manufacturing process to the design process, and proposed the new concept of “product quality is designed”.

Figure 1 Statistics of design and product cost ratio

In addition, in order to adapt to the dynamic and ever-changing global market demand, the virtual manufacturing idea was put forward abroad in the late 1980s, and significant benefits were achieved. Virtual manufacturing is the use of computer support technology to fully model and simulate the necessary production and manufacturing activities, and product modeling and simulation technology is the core technology to achieve virtual manufacturing. Drawing on the principle of this idea, this paper proposes a design quality assurance technology in the desktop virtual environment, and puts the product design work into a virtual design, analysis and simulation environment, which provides a strong support for the product design process. surroundings.

1 Overall framework of the design quality assurance system in a virtual environment

overall framework

The product is ultimately served to the user, and the design of a new product also originates from the user, such as the user's dissatisfaction with certain performance, structure and other aspects of the product or some new requirements according to their own needs. Can be attributed to the needs of users. Therefore, the input of the design quality assurance system should be a series of user requirements, followed by user needs analysis, which translates the user's needs into the corresponding functions of the product.

The design quality assurance system includes a product design module and a design analysis module. The design module of the product mainly uses the top-down design method from the product concept design to the NC programming process with the support of the design knowledge base. The product design analysis module uses various design analysis and evaluation methods to evaluate and analyze the design characteristics, structure, and process aspects of the product, find problems, propose improvement measures, and feed back to the design process. In addition, it also includes assembly process simulation and NC machining process simulation, which mainly simulates the assembly process of the workpiece and the cutting process in machining, and verifies the assembly sequence and path and the correctness of the NC program.

The virtual design quality assurance system ultimately outputs reasonable design results to the virtual manufacturing environment. The entire system structure is shown in Figure 2.

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