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【正文】 ed modular product design method. It includes two aspects: First, under the new design requirements Functional analysis, and reasonable to create a set of modules that is, the creation module。 two design requirements are based on the existence of a group of rational bination of specific modules into a modular product program that is, an integrated module. There are two forms of its design: First, designbased, and the other is a variant design. Based design clearly contains the abovementioned two aspects, and the variant design contains only the second general aspects, but there is no exchange of modules, it must be included in the first dimension. The end of the 70s, the Japanese scholars modular machine is the purpose and function of a certain structure standardized ponents to facilitate the bination and open with each other. Select the ponents required for assembly, can constitute a play all function machine or system. Ministry of China machine tool design course modular design of the machine tool is defined as: the machine The same function in bed unit, designed with different uses or properties, selection of interchangeable modules to better meet the needs of a design method. That modularity is the advanced form of standardization is a tool for thinking. Is generally believed that, as of now, the concept of modularity has not yet form a unified definition of the study along with further development, it is of its nature will further deepen the understanding.2 modular design of the study the implementation of modular design method Modular design to do a good job should be done in five areas of work。 market research, technology forecasting, planning varieties, research first, functional analysis and modular design of the specific implementation of a number of issues requiring attention. Modular design to be followed by three levels , That is, modular product design (analysis phase)。 modular system design (detailed design stage)。 modular product design (application phase): module selection, module integrated. With the development of puter technology, more and more people began to study puterassisted modular design. Method of module division Modular design module is divided into the premise and foundation. Module into the reasonableness of a direct impact on the function of modular systems, performance and cost. Module integrated into the current study, the following way. (1) a systematic way. (2) considering the entire lifecycle impact of the module in the modular division. First of all, the entire life cycle to determine the impact of modular factors, the establishment of the matrix to identify modules in the matrix to determine the vector of the function of the impact of various factors, which function on the cluster vector. (3) based on the relevance of the division. Products by analyzing the position of the ponents (function) between the materials, energy, information, space and other aspects of the degree of interaction to determine the division of modules. (4) technical and economic factors into the bination of modules. (5) the division of other tools for the module.3. The modular design of the technoeconomic significance Modular design of the technical and economic advantages are obvious, the theoretical analysis and practice has proved that the significance of 1. Saving design time and shorten the delivery cycle: the use of modular design methodology, enterprise product series has been a lot of mon modules , upon request in the user can have a small number of modules or design and manufacture of specialized modules can be posed of the products required by users. SCHIESS panies such as Germany, the modular design of machine tool products from order to delivery only four months in general. 2. To facilitate product replacement, the development of variant products: According to user needs, the design of new functional modules, bined into a new modular system function. With a good performance of the new technical design modules to replace the function modules, the development of the performance of good change products. 3, improve product quality, reduce production costs: carefully designed modules, batch processing, and conducive to the organization of specialized production, both to improve quality and reduce costs. Modular design method is not only reform, but also promote the technology throughout the plant, production, management and organizational structure reform. 4 to facilitate maintenance: As the product by the relatively independent modules, it bees very easy to repair, if necessary, replace the module, without affecting production. 5 to facilitate the standardization of functional modules: the standardization of traditional class based on the basis of parts, and modular products are based on the different modules based on the level of standardization, is a trend in the standardization of the macro.4 modular design theory in the crane industry Modular design is the crane, one of the design direction of development. In accordance with the principles of its modular design and include some basic modules, through different binations to form different products to meet the diverse needs of users. Crane modular design based on functional analysis, the crane on the basic unit of the same functional pound unit designed for different purposes, different functions Module. Selection of different modules can be bined to form different types and specifications of the general and special cranes. Modular design of crane, the design is not only a method of reform, at the same time will affect the entire crane industry, technology, production and management. Present. Germany, Britain, France, the United States and Japan are already wellknown crane modular design techniques, and achieved remarkable results. According to information on 26], Demag, Germany (DEMAG) the design and manufacture of the pany39。s singlegirder cranes replaced by modular design, its design c