The hottest use of CPC and VPN technology to build

Using CPC and VPN technology to build a virtual manufacturing system

Abstract: the concept of using CPC and VPN technology to build a virtual manufacturing system is proposed for the first time. The system takes CPC as the integrated platform of generalized enterprise information, process and management, VPN as the physical network support, and closely connects product design, manufacturing, procurement, marketing, sales and customers through Internet technology, so as to effectively solve the problems of platform and network security in virtual manufacturing. Finally, the feasibility of the theoretical framework of the virtual manufacturing system is verified by an engineering application example

key words: CPC; VPN； Virtual manufacturing system

1 opportunities and challenges faced by the manufacturing industry

virtual manufacturing (VM) is a new manufacturing mode, which is a comprehensive technology formed by multi-disciplinary advanced knowledge, such as computer network technology, graphics, mechanical and electrical products cad/cam technology, artificial intelligence technology, computer simulation technology, virtual reality technology, computer integrated manufacturing technology, concurrent engineering technology, system engineering and so on, Its framework and architecture play a key role in the research and application of its unit technology [1]. However, through the research of the author of this paper, it is found that before the improvement of production safety level, there is still a lack of systematic research on virtual manufacturing at the level between enterprises, which can not ensure the safe exchange and sharing of product data and information and the complete collaborative work between enterprises, which limits the further application of virtual manufacturing technology

with the advent of the era of B2B e-commerce and enterprise e-commerce, and the mature development of technology characterized by the federal product cooperative development environment centered on Internet and web technology in the past two years, the manufacturing industry is facing a new change: customers need to customize their own products; Product manufacturing requires cross department and cross enterprise collaboration, and these departments and enterprises have their own unique business processes and information systems; Temporary combinations are needed within enterprises and between enterprises, loose alliances have increased sharply, and virtual enterprises have begun to appear. In order to adapt to this business environment, enterprises need to use a technology to enable them to quickly acquire and process all kinds of knowledge and information, and effectively combine and use all available resources in the world. Collaborative Product Commerce (CPC) technology is a solution proposed by data report printing to meet the above needs of enterprises [2]. At the same time, this global cooperation through the Internet is facing the problem of how to build a safe, reliable, convenient and fast generalized enterprise network, so as to save network construction and communication costs. Virtual private network (VPN) technology came into being. Its basic point is to turn public into private, so that each enterprise can temporarily excavate some resources from public for its own private use. VPN can make full use of the existing road resources, provide an economical and flexible connection mode, save the investment required by equipment, personnel and management for customers, and reduce the telecommunications costs of users, so it has been rapidly applied [3]

under this background, the author first proposed the idea of applying CPC technology and VPN technology to virtual manufacturing, using CPC software as the information and data integration platform of generalized enterprises, and VPN hardware as the physical network support to solve the problems of platform and network security in virtual manufacturing. Firstly, this paper makes a conceptual design and the construction of the basic framework, and further discusses the implementation of specific projects

2 basic concept design

Product Collaborative Commerce (CPC) is a concept proposed by Aberdeen, Gartner and other internationally renowned IT consulting companies in the late 1990s. It is a kind of software and services of Internet technology, which enables individuals to jointly develop, manufacture and manage products throughout the product life cycle, regardless of their role in the process of product commercialization, and regardless of what tools they use, No matter where they are geographically or in the supply

authorized CPC users can use any standard browser software to view the information in the generalized enterprise information system view, which operates on a group of distributed heterogeneous product development resources. Generally, these resources are located in multiple information warehouses and managed by independent implementation and maintenance systems for our special projects. Its important feature is the loose coupling integration of data and application functions: a unified data model that does not rely on data versatility to ensure the mutual cooperation between individuals. Thus, the integration between enterprise application software becomes easy to realize [4,5]

virtual private network (VPN) uses tunnel technology to establish a logical tunnel on the public network, encrypt the network layer, and use password protection, authentication, permission setting, firewall and other facilities to ensure the integrity of data, avoid illegal theft, and connect remote users, branches, business partners, etc. with the company's enterprises to form an extended enterprise [6]

virtual manufacturing system based on CPC and VPN technology 6 Temperature, humidity and other external environments also have an impact on instrument measurement. The system uses VPN as the physical network support to ensure the security of data transmission, and takes CPC as the information and data integration platform of generalized enterprises to integrate CAX, PDM, SCM, ERP, CRM, component and supplier management (CSM), maintenance, repair, and operation (MRO) Visualization, manufacturing planning and product modeling are integrated and applied. The operation of the whole generalized enterprise can be carried out on the computer connected to the Internet, which conforms to the real virtual operation, without a large number of physical prototypes and repeated trial production. There is no need to make blind decisions, lose business opportunities, do not need to buy and sell without money, do not need to wait for a long time, do not need to be poor in dealing with emergencies, and do not need a lot of actual investment. Just use the mouse to select, drag and click

the virtual manufacturing system built by using CPC and VPN technology has the following characteristics:

(1) product centered collaborative product management is carried out in a top-down and integrated way, and users, suppliers, partners, product knowledge and business processes can be concentrated on product innovation, so as to maximize the innovation ability of the value chain inside and outside the enterprise

(2) extensive collaboration. CPC can closely connect product design, engineering, manufacturing, procurement, marketing, sales and customers through the Internet. All authorized users can collaborate anytime and anywhere as long as they provide effective user identification codes. The collaborative functions of the virtual manufacturing system include: ① project collaboration: establish a real-time workspace, so that dispersed participants in the value chain can create, share and manage project information; ② Requirements collaboration: enables qualified participants in the value chain to create, capture, share and manage product requirements, including configuration management, budget analysis, report or document generation, validation testing and decision support; ③ Product collaboration: enable qualified participants in the value chain to capture dispersed product information, transform them into product knowledge, and share and manage them among enterprises; ④ Design collaboration: provides a CAD collaborative environment, enabling the entire value chain to seamlessly construct and assemble virtual product models using product design data from any CAD system in the industry; ⑤ Enterprise collaboration: enables development teams composed of different enterprises to clearly understand the impact of engineering changes and replacements in order to make the best decisions

(3) security this system adopts VPN encryption and decryption technology and user and device identity authentication technology in the process of product information transmission to ensure the security of data access, data transmission and the reliability, authenticity and uniqueness of data in the virtual manufacturing system

(4) adapt to the future network technology. The virtual manufacturing system built by CPC and VPN is based on the standard pure web (WEB native) technology and J2EE standard Internet e-commerce framework. It has an open architecture and completely uses the network to manage the whole life cycle of products. The network has scalability

3 the basic structure framework of the system

as mentioned above, the virtual manufacturing system built by using CPC and VPN technology takes CPC as the integrated platform for generalized enterprise information, process and management, and VPN as the physical network support. Through Internet technology, product design, engineering, procurement, marketing, sales and customers can be closely linked to form a global knowledge network to realize information in enterprises and enterprise branches, Security sharing among partners, suppliers, users, etc., as well as remote and collaborative design of products. Its basic structural framework is shown in Figure 1

it can be seen from Figure 1 that the security of data transmission in the virtual manufacturing system is guaranteed by VPN. It takes full advantage of the advantages of VPN, such as low cost, easy management, low overhead, high flexibility, good confidentiality and so on, and solves the security problems of the network from three aspects: privacy, integrity and authenticity. Among them, confidentiality ensures that outsiders cannot see or obtain data during data transmission; Integrity ensures that the data is not modified and can arrive at the destination as is; Reliability ensures that the identity of the communicating party is correct

at the same time, different from the engineering data of products managed by PDM in the past, the virtual manufacturing system uses CPC to manage the data of the whole life cycle of products, including conceptual design, product definition, procurement, production and manufacturing, service, maintenance and even product scrap. It also provides a seamless link between the scattered data sources of manufacturing enterprises, so that when products develop and change over time, a common product representation can be established. As a system, it contains many small and independent subsystems applied to different stages of the product life cycle. The architecture of CPC is divided into three layers, as shown in Figure 2

the first layer is the basic database, including all product related information and knowledge wealth; The middle layer is a channel for collaborative work by exchanging various shared data and entity models through interconnection and communication between enterprises; The third layer is the e-commerce application layer, and all kinds of data generated are sent to DBMS for unified management

4 specific implementation and application of the system

in order to develop a new product, the design teams of three enterprises a, B and C located in different countries form a development team as partners. They will spend a week to jointly design and manufacture the product through the Internet. Among them, the CPC software adopts Windchill of PTC company to ensure that the three design teams can share and access information at all stages of the product development process; VPN adopts the firewall technology of LinkTrust cyberwalltm series, and all data are organized in a unified database environment to ensure the seamless cooperation of different parts produced in these three companies. The structure of the specific implementation scheme is shown in Figure 3