Papers by Keyword: Grinding Machine

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Authors: Y.X. Jiang, Wei Xiao Tang, G.L. Zhang, Qing Hua Song, B.B. Li, B. Du
Abstract: In this article, modal experiments were used to analysis the dynamics characteristics of the grinding machine. Static modal testing has validated the nature frequency and the critical speeds were also recognized by dynamic racing experiment. In grinding experiment, the surface roughness was investigated in different speed of workpiece spindle. The way to reduce vibration that caused to bad surface roughness of workpiece was also discussed. This experiment laid a foundation to optimize the structure parameter to improve the dynamic character of the grinding machine.
Authors: Ping Li, Bang Jun Wang
Abstract: The value of grinding angle of grinding machine directly affects working efficiency and processing precision of gear grinding machines. A mathematical model of Generating Motion is established by analyzing and studying working principle and machining processes of the grinding machine. Equations of Generating Motion had been determined when the grinding machine was working. Then the relationship between grinding angle and Generating Motion was gotten and the optimal value of the grinding angle was finally obtained.
Authors: Yong Tian, Xian Zhou Cao
Abstract: Analyze the familiar failures and its elimination of hydraulic system which affect the processing precision of grinding machine. Find out mostly problems of the hydraulic system. Movable platform ‘crawl’; the velocity disaccord of the movable platform moving out and home; the rapidity falls short of theory value when the movable platform moves speediness; when the movable platform is being start-up or stop, it may rush ahead suddenly; the positions’ precision of the movable platform is affected by the three-position directional control valve. The temperature of oil is too high when the machine is working etc. Bring forward the method how to eliminate these failures. These can offer some reference for grinding machine on its design, use, maintenance etc.
Authors: Xia Lun Yun, Zheng Bang Hu, Xiao Bo Ma, Xue Song Mei, Ge Dong Jiang
Abstract: The vibration of grinding wheel spindle will significantly reduce the machining quality and machining accuracy of precision grinding. In order to suppress the grinding wheel rotor vibration effectively, the Spray-Typed online dynamic balance system for specific grinding wheel spindle was designed composed of terminal balance, hydraulic system and control system. To achieve the amount of spindle unbalance accurate extraction and liquid volume control, using hydraulic system to achieve the balance of the terminal of the liquid loading and using high-performance DSP chip as a control method. A segmented spindle online dynamic balance method , combining the advantages of influence coefficient method and coordinate rotation optimization method was proposed. The method can fast approaching the goal of balancing and meet the local precise adjustment of the balance weight. At last, the online dynamic balance experiment of grinding wheel spindle is carried out in the industrial field, the grinding spindle vibration displacement amplitude decreased from 17.8 to 7.7 before and after balance, fall by as much as 55%, which verifies the validity and feasibility of the system.
Authors: Xian Xiang Lin, Ze Yu Weng, Bo Lu, Tuo Yang, Hong Gang Ding
Abstract: The dynamic model of machine tool structure is the basic of its dynamic analysis and dynamic optimization. The determination of joint interface stiffness and damping of grinding machine structures is one of key problems to dynamic analysis of machine tools. A method to identify interface dynamic parameters of grinding machine structures using measured transfer function data and optimization technique is presented in this paper. Finally, do the whole machine modal analysis with method and finite element method, contrast the experimental and theoretical results, proved this finite element model can stimulate the dynamic performance of the whole machine effectively, it is of practical value of engineering application.
Authors: Lei Zhang, He Ran Yang, Zuo Jie Zhang, Tong Zhan Li
Abstract: Blade is the key part of aeroengine. The main method for grinding blade is manual operation, which is inefficient. A new machine for grinding both sides of blade synchronically is proposed in this paper to improve the efficiency and machining accuracy. The modal analysis for the machine is demonstrated using ANSYS and the modal testing experiments verify the theoretical analysis.
Authors: Z. Shao, Ya Dong Gong, Wan Shan Wang
Authors: Hiroshi Mizumoto, Taiki Sunahara, Yoshito Yabuta, Shiro Arii, S. Fujii, K. Matsumoto, K. Murakami
Abstract: A novel diaphragm-control restrictor (DCR) is proposed for improving the performance of the hydrostatic-bearing spindle used in machine tools. The unique function of the proposed DCR is the wide adjustability of its restrictor characteristic. A two-step restriction system is adopted for the DCR; a spool restrictor is used as the first step restrictor. By changing the restrictor resistance of the spool restrictor, the effect of the active control in the DCR, the second step restrictor, can be altered. The proposed DCR is incorporated into a hydrostatic bearing supporting a precision spindle, and the performance of the bearing is analyzed. Numerical and experimental analyses show that the stiffness of the hydrostatic bearing with the proposed DCR can be five times as large as a conventional hydrostatic bearing of the same dimensions. Analysis of the dynamic compliance shows that the effect of the active control can be observed up to 20Hz. These results show that the proposed DCR is useful for improving the performance of the hydrostatic-bearing spindle in precision applications.
Authors: Shu Ming Yang, Yu Kun Xu, Lin Yang, Shi Long Liu, Hui Ying Zhao, Xing Yuan Long, Zhuang De Jiang
Abstract: Manufacture of ultra-precision micro-structured freeform surface relies on the high precision of machine tools. Precision, stability and repeatability of the Z-axis are the key factors of the high precision machine tools. The key component of the Z-axis is the ram, and its stiffness and stability have a crucial influence on the final precision. This paper demonstrated the structure optimization of the ram using finite element method based on ANSYS and the results were achieved to illustrate how the optimization variables affect the stiffness and deformation of the ram. Finally, the local three optimal design points were displayed and one of the most appropriate candidate points was chosen as the new design.
Authors: Zhen Yuan Jia, X.J. Sheng, Ren Ke Kang, Z.X. Xu, T. Ji
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