First, the problems in the application of CAD and CAPP After applying CAD and CAPP system, a large number of electronic documents are quickly generated on the computer. This is especially true for large enterprises. How to ensure the integrity, consistency and correctness of electronic documents is a big problem after applying CAD and CAPP systems. Most enterprises generally do not have a dedicated map document management system. They simply use the shared directory structure to manage electronic documents simply. There is no permission control, no version control, no hierarchical structure, no efficient and simple query means, and no inbound submission mechanism. This makes the electronic document difficult to query, the degree of sharing is not high, the data information transmission speed is slow, and the utilization rate is low. Many companies' design BOMs and process BOMs cannot be automatically generated by CAD and CAPP systems, and there is still a lot of manual labor and repeated input. Not only that, but this simple electronic document management still has great security risks. In Other words, most companies are currently unable to guarantee the integrity, consistency and correctness of electronic documents. We know that the biggest benefit of applying a computer system comes from integration and sharing. Although CAD and CAPP can significantly improve the design and process efficiency, if the integration and sharing cannot be realized, the benefits they generate are still limited. This is one reason why the current enterprises have doubts about the benefits of CAD and CAPP applications. Therefore, CAD must provide the information required by CAPP. Similarly, CAPP must provide shared data for the production department. Since the design and process are in the upstream of the production, the data generated by them is the source information of the enterprise, so CAD/CAPP integration and CAD, The integration of CAPP and subsequent management information system is of special significance. Only by implementing integration can a continuous flow of information be formed, and the application efficiency of CAD and CAPP can be further improved, so as to improve the operational efficiency of the enterprise as a whole. However, computer-aided technologies such as CAD and CAPP are developed separately. The application of these technologies is mostly distributed and isolated single applications. They do not have the ability to integrate with each other, and cannot realize the automatic transmission and exchange of information between systems. A large number of secondary repetitive input problems have formed many automated information islands in the practical application of enterprises. The application of CAD and CAPP has brought a new look to the technical work of the enterprise, but its development has exposed the contradiction between advanced technical means and backward management mode. With the full application of CAD and CAPP, electronic data is increasing, and the technical work mode is quietly changing. The management mode based on paper media is slowly losing its effectiveness. As time goes by, it will not be able to adapt to electronics. Management requirements for data and computer work patterns. Nowadays, many enterprises still follow the traditional paper-based management mode after implementing CAD and CAPP systems, which seriously hinders the further application of CAD and CAPP system benefits. How to realize the effective management of electronic documents, how to realize information integration and data sharing between CAD and CAPP systems, how to meet the requirements of computer working mode has become a problem that must be solved in the further development of enterprise informatization, which is derived from the manufacturing product data. After nearly two decades of development, Product Data Manager technology has solved the above problems and become an integrated platform for enterprise informationization. Second, PDM overview PDM is based on software technology, with products as the core, and realizes the integrated management of product-related data, processes and resources. Data related to the product includes any data belonging to the product, such as CAD/CAPP/CAM/CAE files, product structure, electronic documents, scanned images, database files, and so on. Product-related processes include task assignment processes, approval/issuance processes, engineering change processes, institutional relationships, and more, and aspects of the product lifecycle. The emergence of PDM technology is mainly to solve the problem of information islands existing in the manufacturing industry after the popularization of CAx unit technology, and to realize enterprise information integration and process integration. PDM is clearly positioned as a manufacturing enterprise, with products as the core of management, with data, processes and resources as the three elements of management information. The two main lines of PDM information management are static product structure and dynamic product design process. All information organization and resource management are built around product design. This is also the PDM system different from other information management systems, such as management. The key to information systems (MIS), material management systems (MRP), and project management systems. As a technology emerging at the end of the 20th century, PDM inherits and develops the core ideas of CIM and other technologies. Under the guidance of system engineering ideas, it describes the product design data and design process with the concept of overall optimization, standardizes product lifecycle management, and maintains products. Data consistency and traceability. The core idea of ​​PDM is the orderly design data, the optimization of the design process and the sharing of resources. The PDM system involves a large amount of original information from many other application systems, such as CAD and CAPP. Therefore, its main feature is integration, which realizes data sharing and communication between PDM and application systems through a complete interface. It supports distributed software, heterogeneous environments, different software and hardware platforms, different networks and different databases. CAD, CAPP and other systems exchange information through PDM, thus realizing the seamless integration of CAD, CAPP and CAM. PDM is a management tool in the digital environment, which solves management problems brought by system applications such as CAD and CAPP, such as file storage, warehousing, classification, query, sharing, borrowing, information extraction, product structure management, configuration management, version management, Security, etc., use dynamic process management to improve the business management level under the computer work mode, and finally achieve paperless office. PDM is the integrated platform of CAD/CAPP, which is the bridge of information transmission and communication. PDM organically organizes all the data of the complete life cycle related to products, so it maintains a global model of the product and guarantees the uniqueness of the information and Consistency, which makes it possible to "deliver the right information to the right people at the right time in the right way." The development of PDM technology can be divided into the following three stages: the PDM system with CAD tools, the professional PDM products and the standardization stage of PDM. At present, there are many well-known PDM softwares at home and abroad, such as SDRC company Metaphase, EDS company IMAN, PTC company Winchill, IBM company Product Manager, Kaimu company KMPDM, etc., which basically represent PDM technology at home and abroad. The highest level. Most of the current PDM products adopt a distributed client/server structure. The server is responsible for public data storage and multi-user synchronization. The client is mainly responsible for interaction with users and management of customer private data. The general architecture of a PDM system is shown in Figure 1: Next page Square Nuts And Bolts,Square Thread Nut,Square Nuts Bunnings,Metric Square Nuts Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com
Application of PDM in CAD/CAPP Integration