Applied Mechanics and Materials Vols. 602-605

Abstract: The dynamic finite element model of entire gearbox, including gears, shafts, bearings and gearbox housing was established by using the truss element, spring element and tetrahedral element at first. Then the shock spectrum of GWC6066 gearbox was gotten according to German specification BV043/85. After the shock spectrum converted into equivalent time-domain acceleration curve, the vibration velocity, vibration acceleration and dynamic stress of GWC6066 gearbox under the double half-sine acceleration shock excitation were simulated. At last, the shock resistance performance of gearbox was analyzed combining with the strength criterion.

Abstract: In this paper, a model of topology optimization for the lightest plate structures with linear buckling constraints is constructed based on Independent, Continuous and Mapping (ICM) method. Exponential function is adopted as filtering function of the element weight, the element stiffness matrix and the element geometric stiffness matrix. Based on the Taylor expansion and the filtering function, the buckling constraints were approximately expressed as explicit functions. The optimization model was translated into a dual programming and solved by the sequence second-order programming. Two numerical examples show that this method is validity and efficient.

Abstract: Based on experiments of ball-end cutters milling for 2A70 aluminum alloy, the prediction model of surface roughness for 2A70 aluminum alloy is established by using of regression analysis method of least square. Aiming at the actual milling problem in the enterprise the cutting parameters are optimized by using of optimization tool-box of MATLAB software, in the process of solving optimized parameters the machining efficiency is set as the objective function and surface roughness prediction model is set as the constraint condition. The optimized cutting parameters can greatly improve the machining efficiency in the premise of ensuring the quality of machined surface, and it provides the important theory evidence and case reference for NC machining enterprises to reduce production costs.

Abstract: A common problem in transport machinery equipment is friction and wear. This problem largely affects the service life in a transport machinery equipment. It should be given enough attention to the tribology design in transport machinery design. This article mainly describe the tribology design content from the material choice, surface design, structural design to lubrication technology, etc.

Abstract: The automobile elevator sedan frame is composed of the main sedan and the vice-sedan frame. Main sedan with vice-sedan by respective putting up the uppert beam, the straight beam, the under beam to be composed separately, connection mode by bold fastening primarily. Using Solidwoks software to design the main components of a sedan modeling and the completion of the necessary mechanical calculation.

Abstract: To solve the problem it is difficult to accurately measure the curve surface, the forming mechanism of reverse engineering modeling approach is studied. Using the non-contact measurement of laser scanner, the point cloud data of the compression molding bodies is obtained, and it is introduced into the three-dimensional software CATIA to generate 3D model according to the molding processing point cloud and compression molding mechanism. In the last to generate the complete engineering drawings. Comparing the traditional design method, the method is mainly used for 3D parts reconstruction and design in surface shape is difficult to accurately expressed or unknown component shape design methods.

Abstract: Aiming at the material characteristics of quartz, dimensional accuracy requirements of quartz pendulous reed flexible beam and boss, this paper presents a quartz pendulous reed chemical etching processing technology. The principle of quartz chemical etching process is introduced, and a process of quartz pendulous reed chemical etching technology experiment is designed. The results of the experiment verified the effectiveness of the technology.

Abstract: In this paper, In view of body frame of a flying car, the dynamic performance was studied.Firstly, geometry model of the body frame was built by CATIA software. Secondly, plotted in girding form was established by ANSYS software. Thirdly, loading and restraint were added on model and dynamic characteristic was analyzed. Finally, a better conclusion was obtained.

Abstract: The fatigue behavior of notch specimens has been investigated in this manuscript. It is shown that notch geometric size has apparent effect for fatigue strength of specimens. The blunt notch is used in test. It is concluded that geometric size effect depends on the stress gradient and can be estimated with the help of the linear elastic fracture mechanics. The influence of notch size for fatigue strength can be explained with geometric factor. The plastic strain play an important role in fatigue crack initiation with notch gets sharper reach certain magnitude limit, and fatigue strength is lower than the predicted by geometric size factor effect. The method does not apply fatigue strength of the sharper notch. Another estimation method shall be used to that kind of notches.

Abstract: Cooling roll is a key component in preparation of amorphous alloy ribbon process. The cooling roll rotates at a high speed that causes large centrifugal force on coolant. The reasonable channel structure facilitates the cooling effect and decreases power consumption. Different channel structures in the cooling roll are analyzed in this paper by computer fluid dynamic (CFD) method. The simulation calculated out the pressure distribution and streamline in different channel structure. The simulation results show that flow in case 2 is the optimal in three channel structures. Finally, the structure of the case 2 is manufactured and tested. It is shown that there is no flow block in the channel.