At present, foreign companies have developed PDM products with complete functions, good openness, novel ideas and advanced technology, such as UMAN's IMAN, IBM's Product Manager, SDRC's Metaphase, PTC's Windchill, etc. The products have been promoted and applied in Boeing, IBM, Ford, and General Motors, and have achieved success. Some domestic enterprises, such as Chunlan, Haier, Changhong and Konka, use the IMAN system, and Xi'an Aircraft Design has adopted IBM's PM system, which has also achieved certain success. At the same time, domestic software vendors have also launched their own PDM products, such as IntePDM of Wuhan Tianyu Company, KMPDM of Wuhan Kaimu Technology Integration Company, and TFPDMS of Tsinghua Tongfang Software Company. The domestic PDM system has a big gap with foreign products in terms of function, technology, ideology and stability, but it has certain advantages in terms of price and customization. Therefore, it is in some domestic enterprises. It has also been applied, such as Tianyu's IntePDM system, Tongfang's TFPDM system, and Daheng's DHPDM system.
3. Enterprise informationization marked by CIMS
Following the birth of CAD technology in the middle and late 20th century, information technology entered the management business in 1954, and MRP/MRPII technology was produced. These individual technologies have reached a high level in their respective fields, but due to the lack of effective information communication and coordination between these unit technologies and equipment, such as CAD technology is generally used for product shape definition, CAM is mainly used for NC programming, and CAE focuses on In numerical simulation, each has different information requirements and file formats, which makes the information exchange between the systems very unsmooth, resulting in a so-called "automation island" state. How to integrate various unit technologies organically and apply them comprehensively has become a research hotspot. The United States first proposed the CIM (Computer Integrated Manufacturing) philosophy in 1973. Its basic idea is to treat various activities in manufacturing enterprises, such as market analysis, business decision-making, engineering design, manufacturing and processing, quality control, and after-sales service. A whole that is closely linked to each other and treats the entire manufacturing process as a process of data search, transfer, processing, and processing. CIM is an advanced philosophy based on traditional manufacturing technology, information technology, management technology, automation technology and system engineering technology. However, limited to the technical conditions at that time, until the early 1980s, the CIMS-based manufacturing system CIMS was gradually adopted and adopted by the manufacturing field. In the past decade or two, under the impetus of market competition and related technological advancement, CIM concept and its technology have been enriched, improved and developed in practice, from the initial computer integrated manufacturing to modern integrated manufacturing, and its connotation From the integration of internal information, to the integration of design and manufacturing processes (concurrent engineering), to the integration of enterprises (dynamic alliance).
The CIMS theme was established in the high-tech development plan proposed by China in 1986. Since 1989, 20 typical enterprises have been selected to implement the CIMS application demonstration project. Since 1994, more than 80 enterprise organizations have been selected for promotion and application [8]. The implementation of CIMS shortens the delivery time and quotation time of products to different extents, reduces the cost and inventory of products, and improves the output and quality of products. For example, the National 863/CIMS theme takes Huazhong University of Science and Technology as the technical support unit to undertake the development and application of the CAD/CAPP/CAM integrated system for body and cover parts of Dongfeng Motor Corporation. After the implementation of the integrated system, the body design efficiency has more than doubled, the efficiency of the process design has increased by more than 50%, and the quality of the processed cover mold has been close to the foreign level, significantly improving the body and cover mold of Dongfeng Motor Corporation. The quality of the product shortens the design and manufacturing cycle of the body and enhances the competitiveness of the company. The domestic mold industry implements CIMS or enterprise information projects, including Haier, Kelon, Chengfei, Beiqi Foton, and Efeng. By implementing enterprise information projects, these enterprises have improved the level of application of computer technology throughout the enterprise, created significant economic benefits, and played a typical demonstration role in domestic mold companies, accumulating valuable application experience.
Mold manufacturing is a typical one-piece production method, which is an extreme form of multi-variety and small-volume production. Each batch of molds is generally only one piece, so the usual MRPII and ERP systems are not suitable for the application of mold enterprises. This is also a difficult problem facing the informatization of mold enterprises, which has not been solved very well yet. At present, most enterprise information projects still stay in the local application of ERP system, such as contract management, financial management, material management, equipment management, etc. Production planning management and workshop scheduling control applications are rare. In view of the characteristics of mold enterprises, some universities and research institutions in China have already carried out research in this area, among which MES (Manufacturing Execution System) is a research hotspot. MES is a two-way information communication platform for the planning layer of the enterprise and the execution layer of the workshop. Some people define MES as "can be optimized through the information transfer to the entire production process from the order to the product." The MES manages and optimizes the relevant hardware and software systems from the production planning to the production process of the finished product. By controlling and utilizing real-time and accurate manufacturing information to guide, communicate, respond to and report on various activities happening in the workshop, Corporate decision making provides information about the evaluation of production activities. The Manufacturing Execution Systems Association's MESA survey of MES applications found that using MES technology can shorten the manufacturing cycle by 45%, reduce work-in-progress by 17%, and improve product quality/reduced defective products by 15% [9]. Beijing University of Aeronautics and Astronautics, Southeast University, Nanjing University of Science and Technology and other units have done certain work in the development of MES theory and application systems under the support of the National 863 Program, such as the advanced management control system for agile manufacturing workshops; Starting from the production management system of the enterprise, it is proposed to use the advanced MES ideas and software to assist in the establishment of an agile workshop system. Domestic MES research still mainly stays on the research of MES's thought, connotation and architecture. It has not yet been able to introduce mature and practical MES software.
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