Advanced Materials Research Vols. 156-157

Abstract: this paper makes use of the bifurcated power theories researching combined stepless transmission bifurcated characteristic, and put forward an initiative design method which used controlling the system bifurcated power to confirm each parts of system’s drive ratio and geometry parameter, supplying the theory foundation and method for the same type transmission design.

Abstract: To enhance the structure strength and working life of the existing ladder-type chain connector, and chain connector productivity and manufacture craftwork. The ANSYS finite element software is utilized to simulate contact non-linear finite element analysis of ladder type chain connector. And the static and dynamic experiments are carried on several samples. Finite element simulation results show that the main part of stress concentration is in teeth roots; experiments results show that the teeth roots are the fragile parts in the chain connector, the results of finite element analysis is conformed to the results of the experiments, thus that the ANSYS finite element software is utilized to simulate contact non-linear finite element analysis of chain connector is reasonable. Because of the shortcoming of straight tooth chain connector, then promoted a chain connector of cambered surface tooth structure. Through the analysis, it shows that cambered surface can augment the contact areas in teeth, and prevent partial loading in teeth meshing. When chain connector manufactured, clamping tongs are quite complex, but the petal-type clamps structures are adopted, that can carry out volume-producing, thereby, and the productivity and processing precision are improved.

Abstract: The high temperature & low cycle fatigue were experimentally studied with the 3-dimension notched 2.25Cr—1Mo steel specimens. The 3-dimension stress-strain responses of specimens were calculated by means of the program ADINA. The prediction method of 3-dimension fatigue life was discussed according to the theory of high temperature strength. The results of experiments and calculations showed that the equivalent strain range can be served as the valid mechanics for predicting fatigue life.

Abstract: The paper establishes an Analytic Hierarchy model by applying the basic decision theory of AHP and carefully analyzing consideration factors of bus board customers. Regarding the scientificalness, feasibility, stability and efficiency as evaluation criterions, the model structures judgment matrixes and determines the important degree of each influencing factor with the help of hierarchical single arrangement. The paper provides a reference for the bus board enterprise's decision-making by making clear of main factors affecting its customers’ purchasing behavior.

Abstract: In modern manufacturing, it is urgent to require integrating manufacturing and inspection because manual inspection and off-line inspection severely restricts the development of inspecting automation. In the paper, automatic programming system based on solid driven technology for machining center on-line inspection has been developed by secondary development kit object ARX of CAD. Inspection feature datum and information were gotten by ARX tool in CAD stage, and then inspecting program can be automatically made up through inspecting process planning. On-line inspection automatic programming system based on solid driven technology has been applied in SSK-U6035 machining center. The application result shows that the programming system is simple and effective, which has realized integration of manufacturing and inspection more efficiently, increased precision, production efficiency and reduced the rate of rejection and tool damage.

Abstract: Dynamic modelling method for parallel indexing cam mechanism was presented based on multi-body system dynamics according to the analysis of mechanism feature. Rigid-flexible coupled dynamic model was established by means of Adams, Pro/E and Ansys. Dynamic simulation has been done. It follows the analysis of simulation that modified cosine transmission function is not suitable to be applied in high speed, heavy load or precision transmission cases. The effects of load inertia, input speed, and stroke angle to torsional vibration were illustrated corresponding to dynamics simulation.

Abstract: This paper examined the requirements of economy, industry and society for the education of engineers in the field of automotive engineering/service (AES). It introduced a novel engineering education model and investigates the effects at its implementation in a Sino-German educational research project in Tongji University. From three main requirements for engineers in automotive industry, it discussed the orientation and features of AES which focus on application-oriented, multi-disciplinary, and intercultural education. The objective of AES is to educate competent engineers meeting industrial requirements and acquiring a double degree as Bachelor of Science at CDHAW and as Bachelor of Engineering at the German partner universities of applied sciences. To guarantee the quality of bachelor-level engineers on knowledge, know-how, engineering competence and soft skills, this education model integrated a useful operation conception from curriculum design, bilingualism, multi-disciplinary and application-oriented education, education structure, and other resources of teaching and combined them into a system. Out of the education model we derived the effects for students, university staffs, and related companies, and the challenges from the implementation at the Sino-German College of Applied Sciences (Chinesisch-Deutsche Hochschule für Angewandte Wissenschaften, for short CDHAW in German language) of Tongji University. The education model and its positive effects can be successfully used for reference to international engineering education reform and practice.

Abstract: The technology that CAD/CAE collaborative design of auto panel die surfaces was introduced. Pro/E and Dynaform adopted, the stamping die surfaces of an auto coping were optimally designed. Based on evaluation of the performing result, the strategy how to modify the die corner and optimize the geometry of blank was given, the invalid problems such as wrinkling and cracking were disposed, which efficiently directed the die designing and greatly improved the stamping conditions. The concept, CAD/CAE collaborative design, provided theoretical guide for optimal design of stamping die and stamping craft in auto panel.

Abstract: Due to the difficulty in the ceramic mould forming process of matrix PDC bits and low production efficiency, a manufacturing mould technology of graphite powder forming process was developed. The technical program is to formulate a circuit of silicone rubber forming process, determine the forming process of first mould, rubber mould and graphite powder mould, and sinter bit. The results show that manufacturing bit mould to sinter PDC bits with this method can simplify the circuit, increase production efficiency, and improve bit quality. The resulting bit is also of high precision, exquisite appearance and good consistency

Abstract: In order to improve their stress distribution and service life, the shape of Belt-type cylinders with Φ40.5mm inner diameter is optimized based on the FEM simulation and orthogonal design. The important order of the factors affecting the stress distribution is found out after the orthogonal FEM simulation calculation. The maximum principle stress is reduced and stress distribution is improved. The cylinder’s life is extended while the cost is down.