Key Engineering Materials Vols. 392-394

Abstract: With the features of rapid response, premium quality, low cost, flexibility, technology of digital design and manufacturing is becoming the principal boost that enhances the manufacturing industry in the 21st century. There are about several hundreds of thousands of scaled manufacturing enterprises that face the upgrading challenge of production technology, organization, and management transformation with the core alteration from 2D design- conventional manufacturing to 3D digital design and digital manufacturing. Netting of three-D digital design and manufacturing system is the only way of upgrading the manufacturing industry orientating to future. An idea of scaled enterprise ally is presented, and based on the scaled enterprise ally, netting frame is put forward and constructed of the digital design and manufacturing system, expounding the functions and features of shared data platform, those of linkages of digital design, digital manufacturing, cell enterprise management, and CSG modeling technique, creation procedure of CAPP, virtual testing technique in the digital design and manufacturing systems, explaining the key considerations including interrelationships among the enterprises , resources share, information security, network security.

Abstract: Lots of cutting heat is generated in milling process, and an unsteady temperature distribution is generated, which is the radical reason of impactive fracture and sticking-welding fracture of the tool. In this paper, the Cellular Automata model of regular gradient heat source on the rake face of milling insert is built using heat transfer theory and cutting principle to analyze the temperature field generated. The boundary condition of the insert is established and the unsteady temperature field of the insert is obtained using the Cellular Automata algorithm, which can be a basis for the direct reconstruction of the insert.

Abstract: In the face of the development trends of NC machine’s networking, this paper presents a new method of transferring NC program based on net transparent bridge technology. By analyzing the principle of serial port communication between NC machine tool and computer, this paper demonstrates the fundamental of net transparent bridge, topology structure, software and hardware realizing of communication function. The single NC machine networking in field showed that the preset qualifications can be reached, which makes the network integrations of existing single NC machines possible.

Abstract: In the process of lot size optimization, various factors such as machine capability and parts assembly lead time need to be considered. Within small batch and multi-items production environment, kitting parts entering to assembly systems in time may valid shorten product manufacturing period, and reduce the quantity of work-in-process (WIP). This paper built up a mathematical model with the objective function of reducing set up costs, shortening cycle of part production and reducing WIP and with constraints of machine capabilities, part process planning and kitting requirement. An object-oriented simulation model is established to control the behavior of logistics objects to meet the target functions through rules aggregation and constraints at the control points, resulting in an optimal production result.

Abstract: Aimed at the individual virtual intelligent vehicles, the individual vision behavior and decision-making behavior of virtual intelligent vehicles are mainly studied. The vision perception picture and fuzzy neural networks decision-making picture are developed and the virtual intelligent vehicles on the platform of dynamic intelligent traffic environment have been built by use of the EONSDK. It not only has improved the reality of traffic environment, and but also can make out the different traffic environment and can simulate various road accident circumstances.

Abstract: Two 3-D finite element models of coated tool and uncoated tool were established using the finite element code DEFORM-2D based on the updated Lagrangian formula. And their machinability on high speed orthogonal machining was simulated and compared. The investigation results indicate that the coated tool has higher surface temperature and lower inside temperature compared with the uncoated tool. Moreover, the cutting forces of the model using coated tool are lower than that using uncoated tool.

Abstract: Virtual prototyping technology as a key technology for agile manufacturing can deal with multidisciplinary knowledge across different fields. In the complex product development process, the exchange between heterogeneous data in heterogeneous environment is a universal problem encountered, which increases the complexity of collaborative parallel design of virtual prototype. Taking the product models as carriers and the different function requirements as clues, the knowledge structure and expression of product information in various fields was studied. By adopting component object model technology, direct geometry access technology, behavioural modeling technology and parametric design thinking, the interaction among tools in various function units was realized, and the effective integration of information and function in multi-fields was accomplished, the parameter-driven virtual prototype architecture of complex product based on the integration of information and function was created. The feasibility of this architecture has been verified by the actual engineering. This plan provides an effective way to carry out virtual prototype projects for enterprise.

Abstract: Fused deposition modeling (FDM) has been widely applied in complex parts manufacturing and rapid tooling and so on. The precision of prototype was affected by many factors during FDM, so it is difficult to depict the process using a precise mathematical model. A novel approach for establishing a BP neural network model to predict FDM prototype precision was proposed in this paper. Firstly, based on analyzing effect of each factor on prototyping precision, some key parameters were confirmed to be feature parameters of BP neural networks. Then, the dimensional numbers of input layer and middle hidden layer were confirmed according to practical conditions, and therefore the model structure was fixed. Finally, the structure was trained by a great lot of experimental data, a model of BP neural network to predict precision of FDM prototype was constituted. The results show that the error can be controlled within 10%, which possesses excellent capability of predicting precision.

Abstract: Rapid prototyping (RP) was an advanced manufacturing technology which satisfied the individuation products. With the development of RP technology, RP providers were always facing the urgent price quotation requirements for RP parts from customers in today’s competition market. In order to support the enterprises to achieve more competitive, this paper developed a service-oriented price quotation system .The paper presented a price quotation model for the RP parts and quotation methods for all RP technologies based on volume technical parameter method. And we proposed a new quoting price system frame using service-oriented architecture and it provided price quotation service for the RP enterprises, standardized their internal management as well as effectively managed the inquiry and bargain between enterprises. Thus the system ensures the price quotation accurately and rapidly.

Abstract: Aim at an existent problems of manufacturing enterprise data exchange between design and manufacturing software, this paper puts forward the solution of data exchange between heterogeneous database with XML, which is based on the systematical analysis of currently data exchange methods between heterogeneous databases, construct the data exchange model between heterogeneous database based on XML. It gives mainly mapping method which is used for data exchange between XML and relational database, and analyzes the algorithm of connecting relational database, in order to solve the problem of transparently interoperation of heterogeneous database and realize data integration and sharing between manufacturing enterprise heterogeneous database. So it provides effective methods.