Materials Science Forum Vols. 626-627

Abstract: To utilize vehicle design knowledge reasonably and effectively, ontology is introduced in this paper and vehicle design domain ontology is constructed within three steps which are: extracting the significant terminologies and concepts in the field, establishing ontology framework, constructing vehicle design domain ontological relation tree combining development tool. According to the method, vehicle design ontological relation tree is built and evaluated through descriptive evaluation and verifiable evaluation. The results are applied in knowledge representation which adopts SVPO (Subject + Verb + Parameter + Object) mode and knowledge retrieval, the effectiveness of ontology is verified in our system. Finally the paper concluded a concurrent method of ontology construction.

Abstract: Information System Planning (ISP) plays an important role in IT strategy. ISP not only faces complicated and dynamic business environment but also lacks of integrated optimization of enterprise strategy, business strategy and IT strategy. This paper proposes an information system planning model, which considers enterprise forming strategic advantages as the core，and emphasizes that strategy layer should adapt to competitive environment dynamically in strategic whole life cycle, and emphasizes that collaborative interaction inside strategy layer should be achieved among enterprise strategy, business strategy and IT strategy. On this basis, make use of this model to plan agile information system of an automobile manufacturing enterprise and achieve important application effects

Abstract: Due to the problems of very serious wear, serious scale and poor ability to controlling strip shape of work roll, considering the advantages/disadvantages of HSS roll and the field practices, a 3D elastoplastic FEM model of rolls system with strip, which is used to analyze the ability of strip shape control of rolls system when HSS rolls work at any two stands of F1-F4, is modeled. The calculating results sho: The control ability of mill is relative greater when HSS rolls are used at F4, the advantages of HSS roll are not taken fully if HSS rolls work at F1 and F2. And HSS are available for either F2 or F3, furthermore, F3 is better for shape control. The analysis results are verified by the experiments. A strong theory base of application of HSS rolls in Hot Strip Mill is brought forward in this paper.

Abstract: DM feature based CNC machining automatic programming technology for rotational parts is studied. Dividing part hierarchy and feature hierarchy analysis method is put forward in CNC machining auto-programming. Algorithms about how to realize feature hierarchy or part hierarchy automatic programming cutting are given such as transverse, lengthways, isometric and concave profile machining cycles. An innovative Boolean calculation interference flag method is used in turning isometric algorithm. One-to-one mapping of creating tool pathways algorithm to machining process step is expediently to get diversiform machining project from part profiles.

Abstract: The nickel-based superalloy GH80A has been widely used in kinds of aeronautical key structures because of its high yield stress and anti-fatigue performance at high temperature. However, it is also a typical difficult-to-cut material. In order to improve cutting process, kinds of methods have been applied to study cutting process including experimental approach and finite element method (FEM). In this paper, a comparison of chip formation is carried out between traditional Johnson-Cook (JC) model and Isotropic model. Besides, effects of tool rake angle and friction coefficient on chip formation are investigated by Isotropic model. FEM predicated results such as stress and cutting temperature are also analyzed. Relative turning tests are performed and comparison of chip morphology between FEM and experiment is carried out.

Abstract: Along with the development of simulation technology, systems of three-dimensional simulation are being used in more and more domains. The distance of objects is one of the important measures which are used to estimate the relationship of object’s position and to weigh the attributes of their own movement. The distance computing places an important role in the system of 3D simulation. In this paper, the two-phases (broad-phase and narrow-phase) algorithm for computing distance is presented. Using the algorithm, finally we have got the minimum distance of objects, and the feasibility and veracity of the algorithms are proved by an example.

Abstract: The design and machining quality of mold core of luminaire reflector is the key to luminaire manufacturing. According to the structural characteristics of the mold core with axisymmetric uniform-distribution reflecting cells, the mathematical model with five-axis NC programming of this mold core was established. Based on five-axis CNC machine tools with dual rotary tables, then, the NC automatic programming calculation for this mold core was researched. Besides, a simple three-dimensional entity simulation was discussed. In this way, the three-dimensional entity simulation of automatic programming and processing in 5-axis NC machining of this mold core was realized.

Abstract: The three-dimensional figure of a toroidal worm is obtained according the simulation based on the mathematical model. The key of this is the authenticity of the worm surface expressed. Comparing a simulating worm with the true worm, the conformational degree between them can be found out. As the worm surfaces are complex space surfaces, so it is difficult to determine the measuring method and reference for the surfaces of a worm. According to the entire analysis's, the symmetry section of the worm is defined as a representing section. The space surface measuring is converted to a plane curve measuring, and the possibly existing error will be analyzed. The experiments for checking two true worms are made to prove the truthfulness and reliability of the simulation program of the plane enveloping toroidal worm.

Abstract: Organizing production on orders is one important mode for small and medium corporations. In this mode, logistics and purchase are to be progressed on sale orders. To satisfy production demands of specific sale orders for zero stock is the goal of logistics and purchase. In this paper, the logistics & purchase procedure under order-driven is analyzed, with its integrated workflow model being built. The information model of logistics & purchase operation flow is designed in detail with UML method. The solution to main operation issues of logistics & purchase procedure management is discussed, with the system program hierarchy presented. This system has been implemented in an electric equipment enterprise and a distinct achievement is realized.

Abstract: Dynamic balance of the spatial engine is researched. By considering the special wobble-plate engine as the model of spatial RRSSC linkages, design variables on the engine structure are confirmed based on the configuration characters and kinetic analysis of wobble-plate engine. In order to control the vibration of the engine frame and to decrease noise caused by the spatial engine, objective function is choosed as the dimensionless combinations of the various shaking forces and moments, the restriction condition of which presents limiting the percent of shaking moment. Then the optimization design is investigated by the mathematical model for dynamic balance. By use of the optimization design method to a type of wobble-plate engine, the optimization process as an example is demonstrated, it shows that the optimized design method benefits to control vibration and noise on the engines and improve the performance practically and theoretically.