Design and analysis of parallel robots for a flexible fixturing system with performance atlases

According to the automobile industry's flexible manufacturing requirements, a novel flexible fixturing system for sheet metal assembly is proposed with parallel robots. A methodology of the structure synthesis is presented by taking account simultaneously several performance indices. Taking the 3UPU/UPS parallel robot in the system as an example, models of inverse kinematics, Jacobian matrix and design space are developed. Thus, the structure synthesis of the parallel robot is simplified to a two-dimensional problem. Once the performance indices (workspace, singularity and stiffness) are established, the corresponding indices atlases are expressed in the design space. The structure parameters of the parallel robot are obtained by analyzing these atlases. The prototype of the fixturing system is developed, and the relevant clamping and stiffness experiments are conducted. The experimental results generally agree well with the simulation results and satisfy the flexible fixturing systems' requirements.

[1]  Zhenyu Kong,et al.  Fixture workspace synthesis for reconfigurable assembly using procrustes-based pairwise configuration optimization , 2006 .

[2]  Y. Rong,et al.  Flexible Fixturing with Phase-Change Materials. Part 1. Experimental Study on Magnetorheological Fluids , 2000 .

[3]  J. Merlet.  Jacobian, Manipulability, Condition Number and Accuracy of Parallel Robots , 2005, ISRR.

[4]  Hong Hu,et al.  Flexible fixturing system design based on a family of novel parallel robots , 2009, 2008 IEEE International Conference on Robotics and Biomimetics.

[5]  Dehua Yang,et al.  Stiffness analysis of a 3CPS parallel manipulator for mirror active adjusting platform in segmented telescope , 2013 .

[6]  Svetan Ratchev,et al.  Active fixturing: literature review and future research directions , 2013 .

[7]  Tao Sun,et al.  Stiffness analysis and experiment of a novel 5-DoF parallel kinematic machine considering gravitational effects , 2015 .

[8]  H. Harry Asada,et al.  Kinematic analysis of workpart fixturing for flexible assembly with automatically reconfigurable fixtures , 1985, IEEE J. Robotics Autom..

[9]  Zongquan Deng,et al.  Stiffness modeling of a family of 6-DoF parallel mechanisms with three limbs based on screw theory , 2010 .

[10]  Jingxia Yuan,et al.  Deformable Sheet Metal Fixturing: Principles, Algorithms, and Simulations , 1996 .

[11]  Zongquan Deng,et al.  A 6-DOF adaptive parallel manipulator with large tilting capacity , 2012 .

[12]  Clément Gosselin,et al.  A Global Performance Index for the Kinematic Optimization of Robotic Manipulators , 1991 .

[13]  Brian S. Thompson,et al.  Automated design of modular fixtures for flexible manufacturing systems , 1986 .

[14]  Cheng-liang Liu.  A systematic conceptual design of modular fixtures , 1994 .