Multi-body Dynamic Modeling and Error Analysis of Planar Flexible Multi-link Mechanism with Lubricated Revolute Clearance Joints and Crankshaft-bearing Structure

doi:10.3901/JME.2020.03.106

Abstract

Abstract: To predict the dynamic precision of multilink high-speed precision presses (MLHSPPs), it is essential to develop a dynamic model of the multilink mechanism (MLM). Previous models only considered the effect of the clearance, flexible linkages and crank shaft, and often neglected the effect of supporting bearings' stiffness on the crankshaft system, which lowers the dynamic analysis accuracy of the MLM for MLHSPPs. In this work, a computational methodology for modeling and simulation of planar flexible MLM with lubricated clearance joints and spindle-bearing structure is proposed considering the effect of clearance, flexibility of crankshaft and linkage, and bearing stiffness together, and its corresponding dynamic dimension chain between the slider and crankshaft is constructed. It is demonstrated that the simulated dynamic responses from the flexible model with lubricated clearance joints and spindle-bearing structure under no-load and blanking conditions agree better with the experimental data than those from traditional ones, and the effectiveness of the proposed methodology is verified. The measured results show that the acceleration of slider under no-load condition has severe fluctuations at the position of bottom dead center, while that under blanking condition produces a shock peak. The existence of crankshaft-bearing structure aggravates the displacement deviation of slider. The lubricating oil acted as a cushion for MLM, but it cannot improve the motion accuracy of slider. The lubricating oil film in the revolute clearance joint between slider and linkage is insufficient to counteract the impact between bushing and pin, which causes the rupture of lubricating film during operation. The motion of the pin center for revolute joint between lower slider and link was characterized by only one permanent contact state. Furthermore, the effect of the clearance size, the blanking force and the contact angle of the bearing on the dynamic deviation errors are also investigated.

Key words: multilink mechanism, clearance, lubrication, flexibility, multibody dynamic

CLC Number:

TH113

ZHENG Enlai, CHU Lei, JIANG Shuyun, ZHU Songqing, KANG Min, SHI Jinfei. Multi-body Dynamic Modeling and Error Analysis of Planar Flexible Multi-link Mechanism with Lubricated Revolute Clearance Joints and Crankshaft-bearing Structure[J]. Journal of Mechanical Engineering, 2020, 56(3): 106-120.

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