Effect of the Joints Clearance on The Precision of Bottom Dead Center for Multi-rod Mechanical Press
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摘要: 现代加工业对压力机加工精度的要求越来越高,为了探索多连杆压力机运动副间隙对精度的影响,基于ADAMS计算机仿真软件平台建立多连杆压力机动力学模型,采用冲击函数理论模拟间隙接触的碰撞,研究含间隙的运动副对刚性多连杆机构下死点重复精度的影响。结果表明:间隙的存在影响下死点的重复精度,随着转速的提高下死点波动值增大,且下死点位置的平均值向下漂移。与试验测量数据对比分析,确定出运动副间隙是影响下死点波动值的重要因素,而间隙引起的下死点漂移量占实际漂移量比例很小。Abstract: Press processing precision becomes more and more important in Modern processing industry. Based on the computer simulation software ADAMS,the dynamic modeling of multi-rod mechanical press was founded to investigate how the joints clearance for multi-rod mechanical press influence the repeat accuracy of bottom dead center. The impacts between the clearance were simulated using the theory of impulse function to reveal whether the kinematic pairs with clearance have affection on the repeat precision of the bottom dead center(BDC) for multi-rod mechanical press. The results show that the joints clearance influences the repeat precision. The fluctuating values increase and the mean values location of BDC drift downward with the rising rotary speed. Comparing with the experimental data,it is concluded that the fluctuating values is greatly influenced by the clearance between kinematic pairs,but drift distance of BDC caused by the clearance is small.
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Key words:
- clearance /
- computer simulation /
- computer software /
- dynamics
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[1] Haines R S. Survey: 2-dimensional motion and impactat revolute joints[J]. Mechanism and Machine Theory,1980,(15):361-370 (in Chinese) [2] Ravn P. A continuous analysis method for planar multibodysystems with joint clearance[J]. Multibody SystemDynamics,1998,(2):1 -24 (in Chinese) [3] Flores P. A parametric study on the dynamic response oplanar multibody systems with multiple clearance joints[J].Nonlinear Dynamics,2010,(61):633-653 (in Chinese) [4] Khemili I,Romdhane L. Dynamic analysis of a flexibleslider-crank mechanism with clearance[J]. EuropeanJournal of Mechanics A/ Solids,2008,(27):882-898(in Chinese) [5] Lee T W,Wang A C. On the dynamics of intermittent -motion mechanisms,part 1: dynamic model andresponse[J]. Journal of Mechanisms,Transmissions,and Automation in Design,1983,105(3):534-540 (in Chinese) [6] 时兵,金烨. 面向虚拟样机的机构间隙旋转铰建模与动力学仿真[J]. 机械工程学报,2009,45(4):299-303Shi B,Jin Y. Dynamic simulation and modeling ofrevolute clearance joint for virtual prototyping [J].Journal of Mechanical Engineering,2009,45(4):299-303 (in Chinese) [7] 陈滨. 含铰接间隙与杆件柔性的空间伸展机构单元的动力学建模与计算模拟,第一部分:动力学建模[J]. 导弹与航天运载技术,1997,(1):27-37Chen B. Dynamic modeling and computationalsimulation of unit of space deployable mechanism withjoint clearance and link flexibility,part 1: dynamicmodeling of the system [J]. Missile and SpaceVehicles,1997,(1):27-37 (in Chinese) [8] 白争锋,赵阳. 考虑运动副间隙的机构动态特性研究[J]. 振动与冲击,2011,30 (11):17-20Bai Z F,Zhao Y. Dynamic characteristics ofmechanisms with joint clearance [J]. Journal ofvibration and Shock,2011,30(11):17-20 (in Chinese) [9] 鹿新建,朱思洪. 多连杆高速压力机运动学分析[J]. 中国机械工程,2011,22 (11):1296-1301Lu X J,Zhu S H. Kinematic analysis of multi-link high-speed presses [J]. China Mechanical Engineering,2011,22 (11):1296-1301 (in Chinese) [10] 曾梁彬. 新型肘杆式高速压力机关键技术研究[D].南京:南京理工大学,2012Zeng L B. Researches on key technologies of a novelhigh-speed toggle press [D]. Nanjing: NanjingUniversity of Science and Technology,2012 (in Chinese) [11] 杨强,孙志礼. 一种新型并联机构位姿误差建模及灵敏度 分 析[J]. 中 国 机 械 工 程,2008,19 (14):1649-1653Yang Q,Sun Z L. Error modeling and sensitivityanalysis of a novel parallel mechanism [J]. ChinaMechanical Engineering,2008,19(14):1649-1653 (in Chinese) [12] 曾梁彬,孙宇. 并联式液压压力机机构的奇异位形和运动精度分析[J]. 机械科学与技术,2009,28(12):1608-1612Zeng L B,Sun Y. Singularity and kinematics precisionof the mechanism of a parallel hydraulic press [J].Mechanical Science and Technology for AerospaceEngineering,2009,28(12):1608-1612 (in Chinese) [13] 陈树新,贾方. 含间隙高速精密压力机机构动力学研究[J]. 锻压技术,2011,36 (2) :53-58Chen S X,Jia F. Dynamic analysis of high-speedprecision press with clearance [J]. Forging & StampingTechnology,2011,36(2):53-58 (in Chinese) [14] 王晓东,鹿新建. 高速压力机下死点测试及数据分析[J]. 锻压装备与制造技术,2008,43(2):37-X D,Lu J X. Experiments and data analysis ofthe bottom dead center on high-speed press[J]. ChinaMetal Forming Equipment & Manufacturing Technology,2008,43(2):37-39 (in Chinese)
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