| With the progress of technology, development of economy, global informatization and global marketization, the market competition of new products is getting more and more intense. The competition among enterprises is shifted into the competition based on customer requirements and rapidity. How to effectively shorten product design cycles, reduce design costs, respond to market demand instantly, and effect quick delivery constitute the key factors for such enterprises to win customers. This research takes the large-scale complex mechanical product—the hardest in all mechanical products—as the subject and takes the metal forming machine as an example.For large-scale complex mechanical products, there exist such problems as the great difficulties in the design and manufacture, and diversified customer requirements, which make the product development even more challenging. How to effectively use various information resources is essential to realize rapid response design of large and complex mechanical products. How to maximize the use of information resources available to accomplish rapid delivery is crucial for enterprises to keep themselves in an invincible position in the fierce competition. So it is very important to study rapid response design of large and complex mechanical products.Starting with an analysis of the evolution process of production models, this paper tries to explain that the multi-variety small batch production model brings unprecedented challenges for the design and manufacture of large-scale complex mechanical product enterprises, illustrates that the requirements for rapid response design of large and complex mechanical products are most urgent, and puts forward that the maximization of the information resources available is the key to realize rapid delivery. Information reuse consists of two aspects:first, the reuse of existing resources of the enterprise; second, the repeated use of product information in the whole life cycle of the product. Based on information reuse technology, this paper constructs a product lifecycle information model and proposes the technical framework and design flow of the design of large-scale complex mechanical products. The rapid response design of large-scale complex mechanical products should be carried out within the same technical framework, so as to make possible the better reuse of information throughout the entire product life cycle and the effective reuse of the information of the product itself.Aimed at the characteristics of large-scale complex mechanical products, based on the reusability of enterprise resources and product resources, this research tries to scientifically put various design techniques into application and effectively use the enterprise resources available, so it puts forward the quick response design method of large-scale complex mechanical products based on information reuse technology. The research also covers the regulation and the conversion mode of customer requirements, rapid-design-oriented product modeling methods and rapid-design-oriented reusability modeling methods of component resources. As to the quick response design of large-scale complex mechanical products, it puts forth rapid-design-oriented design rules and their applications, together with a new product development approach based on reusability technology, thus making the development of new products faster.The key to achieve fast and accurate quotation of large-scale complex mechanical products is the acquisition, sharing and reuse of the design knowledge. Therefore, a rapid quotation method based on the reuse of design information is under the research of this paper. It proposes a rapid quotation method based on the rapid design system, uses the products'3D model produced from the rapid design system as the basis, matches the components'feature information with the production process information, and establishes an interaction model of the CAD system and rapid quotation system, thus enabling the direct application of the components' feature information into the quotation system. Then, a basic quotation data construction method based on work measurement is proposed. The regression analysis method is used together with the data obtained through work measurement to establish a set of models of the standard time for loading and unloading the components, which better suits the actual situation of the enterprise. The basic quotation data construction based on work measurement technique makes the quotation more accurate.The manufacturability evaluation of components is a hot topic in the field of manufacturing research, and is an extremely important part in the study of rapid response design and concurrent engineering. This paper analyses the existing evaluation methods for product manufacturability at first, and points out that the manufacturability evaluation should be conducted on the basis of the part models and the resource models, while taking the company's existing manufacturing resources into consideration and effecting rapid delivery through effective allocation of existing resources. Manufacturability evaluation of components is composed of two levels, namely, qualitative assessment and quantitative evaluation. In this paper, the quick-response-design-oriented product manufacturability evaluation is conducted, and a qualitative evaluation for product manufacturability can be realized by reusing the feature information of the components coming from the rapid design system. When the components satisfy the requirements of the qualitative evaluation, in consideration of the problems existing in manufacturability evaluation and decision-making, this paper puts forth a multi-criteria decision making for product manufacturability based on Layered Ordinal Relation Analysis. Compared with the comprehensive evaluation, this method provides a convenient way as the calculation involved is greatly reduced.This research is sponsored by the Chinese National Programs for High Technology Research and Development (No 2007AA04Z1A2), and this paper is a part of it. |
