Advanced Materials Research Vols. 889-890

Abstract: Front baffle cracking in low-cycle fatigue strength test was investigated. It is suggested that there was overheating running in the test by visual examination of baffle surface color and fracture surface color. It is obtained that the front baffle was cracked by fatigue mechanism by observation of fracture surface. It is confirmed that the temperature range of overheating was about 700~750°C by temperature and color test. It is shown that the value of hardness decreased heavily when temperature was above 700°C by hardness measurement of sample in temperature and color test, demonstrating the mechanical property decreased severely in the overheating temperature range. Finally, the root cause for the cracking of front baffle might be attributed to overheating running in the test.

Abstract: A stream turbine bowed and twisted blade has been taken as an example for complex parts. Firstly, a simplified computing method for the blade with centrifugal effect is put forward. Then the finite element model of complex parts with centrifugal effect is established. Simulation results show that errors between calculation and simulation results are less than 15%, the simplified computing method has good application value. In addition, the impacts of centrifugal and heat on blade radial deformation are discussed by thermal structural coupling analysis. Numerical simulation results show that heat is the major factor that affects blade radial deformation.

Abstract: This paper study the object of the speed accessory and give the forming numerical simulation of its bending process based on software DYNAFORM. The simulation analysis the effects to its bending springback produced by four factors such as thickness of plate, die fillet, texture of material and the friction coefficient, and research on the factors affect the springback through the orthogonal experiment method, determine the impact factor of the four factors to the bending springback process and find the optimum technological parameters combination.

Abstract: The diaphragm spring is the key element in modern automobile clutch. Its elastic characteristic affects the overall performance of the clutch. Taking a car as an example, According to the design requirements and characteristics, it was to establish the mathematical model of optimum design of automobile clutch diaphragm spring. It was to optimize the design parameters of the basic structure of the diaphragm spring by using the MATLAB optimization toolbox. It did finite element analysis for the 3D modeling using ANSYS software. The results show that: it can be obtained more reasonably of the diaphragm spring elastic curve by the optimal design, shorten the design cycle, reduce the cost of.

Abstract: Introduces the characteristics of topology optimization and bionics, proposes the steps and method of using MSC.Patran to establish the model of the wing structure topology optimization, and through to illustrate the feasibility of the method and the application value of the wing structure topology optimization and bionics design. Key words: topological optimization; wing structure; bionics design ;finite element; MSC Patran;MSC Nastran

Abstract: A lightweight design method is presented which depends on Finite Element Method (FEM).The goal of auto parts` lightweight design is realized based on results of mechanical calculation meanwhile combining experimental results from FEM. As an application of this method, a light truck`s rear axle housing is re-designed and related standards are satisfied. This method is of important science value and guidance meaning in many engineering fields besides in auto industry on the basis of improvement as well as rational application.

Abstract: Control valve is the key element for a thermal power unit. As the core component of the valve assembly, the machining quality of valve bodys mating part is an important factor to restrict the performance of valve, so during the machining process, the demands for dimensional accuracy and surface quality of mating surface are quite high. Firstly, set the cutting tool, cutting parameters and other initial conditions according to enterprises actual requirements of body machining. The Deform 3D which is metal cutting finite element software was used to simulate the boring finishing process of mating surface of the valve body, can effectively analyze the changing rule of cutting force and cutting temperature with time. Then, the single factor analysis method was used to analyze the deformation of boring cutter due to cutting force, temperature and abrasion under the condition of different cutting parameters, which influence the quality and precision of valve bodys machining surface. The analysis results obtained in this paper will provide reference for the choice of cutting parameters in the process of actual valve body finish machining.

Abstract: This paper discusses a new type of worm gear shaver shaving cutter tooth contact point during deformation force, and the establishment of the shaving force model, through the instantaneous cutting force to analyze the force deformation cutter shaving cutter tooth and precision of impact. And making use of a simplified model for variable cross-section cantilever, analyzing of tooth stiffness at any cross section, find the maximum amount of deformation of worm gear shaving cutters do theoretical foundation structure optimization.

Abstract: In order to study the disc cutter cutting performance and the cutters combination feature and to explore a new high-efficiency breaking method in hard rock environment, a new multifunction disc cutter test device plan is established and carried out based on the analysis of relevant research and test equipment at home and abroad. The test device consists of a vertical loading mechanism, a longitudinal cutting mechanism, a shock loading mechanism and a control system, etc. It can be used to conduct not only single test such as cutting under static load, fragmentation under impact load, indentation test under static load and wear test of the disc cutter, but also combined cutting test under impact and static load. At last, granite was cut on this test device by the TBM disc cutter under different loads, the results are desirable and show that the test machine can provide the relevant test conditions and the basic data for the design of the TBM disc cutter.

Abstract: The CNC milling machine is extensively used in manufacturing of the die and the box-type parts. As the increasing requirement of the mechanical products qualities, the components also need higher and higher precision. However, the cutting force induced error affects the machining accuracy of the machined parts seriously. Furthermore, accurate measurement of the cutting force in CNC machining is very difficult. To solve this problem, a motor current-based cutting force induced error detection and modeling method is proposed in this paper. The motor current is obtained from the window function of the Fanuc CNC system. The cutting force induced error model is established according to the least-square method. The motor current-based error model can implement the cutting force induced error fitting effectively, and the fitting accuracy of X, Y, and Z-axis are 97%, 96%, and 84%, respectively.