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Abstract: Based on the structure of 6-TPS parallel kinematic machine
tools (PKMT) with 6 degrees of freedom(DOFS), the procedure to
generate control data is introduced. Locating workpiece coordinate
system and getting position and orientation of the mobile platform are
two necessary issues in the process of postprocessing. Two measures,
comprehensive error coefficient and comprehensive error degree, are
defined to evaluate the precision for various configurations of this
type of machines, and the locating of workpiece coordinate system is
treated as a nonlinear programming which aims at guaranteeing workspace
and improving machining precision. A method to get 6 DOF poses of mobile
platform from 5 DOF cutter location data is presented. Interpolating
algorithm in Descartes coordinate system is investigated and the results
about the cutter trajectories produced by two different interpolating
methods are given. At last, a postprocessor based on these algorithms
mentioned above is introduced and its data flowing is set forth.
Key words: Parallel kinematic machine tools NC machine tools
Postprocessing algorithm Postprocessor
CLC No: TP242
TG659 TG502
国家973重点基础研究项目(G1998060307). Received 20020118, received in
revised form 20020828
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