Journal
CHINESE JOURNAL OF MECHANICAL ENGINEERING
Volume 28, Issue 4, Pages 851-859Publisher
SPRINGEROPEN
DOI: 10.3901/CJME.2015.0427.065
Keywords
parallel mechanism; type synthesis; G(F) Set; type evaluation; press mechanism
Categories
Funding
- National Basic Research Program of China(973 Program) [2013CB035501]
- National Natural Science Foundation of China [51421092, 51335007, 51323005, 51205248]
- Shanghai Municipal Natural Science Foundation, China [12ZR1445200]
- Doctoral Program Foundation of Ministry of Education of China [20120073120060]
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Parallel mechanisms is used in the large capacity servo press to avoid the over-constraint of the traditional redundant actuation. Currently, the researches mainly focus on the performance analysis for some specific parallel press mechanisms. However, the type synthesis and evaluation of parallel press mechanisms is seldom studied, especially for the four degrees of freedom(DOF) press mechanisms. The type synthesis of 4-DOF parallel press mechanisms is carried out based on the generalized function(G(F)) set theory. Five design criteria of 4-DOF parallel press mechanisms are firstly proposed. The general procedure of type synthesis of parallel press mechanisms is obtained, which includes number synthesis, symmetrical synthesis of constraint G(F) sets, decomposition of motion G(F) sets and design of limbs. Nine combinations of constraint G(F) sets of 4-DOF parallel press mechanisms, ten combinations of G(F) sets of active limbs, and eleven combinations of G(F) sets of passive limbs are synthesized. Thirty-eight kinds of press mechanisms are presented and then different structures of kinematic limbs are designed. Finally, the geometrical constraint complexity(GCC), kinematic pair complexity(KPC), and type complexity(TC) are proposed to evaluate the press types and the optimal press type is achieved. The general methodologies of type synthesis and evaluation for parallel press mechanism are suggested.
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