Study On Kinetic Control Technologies For High Speed CNC Leather Cutting

With the development of science and technology and improvement of socialliving conditions, leatherware was widely used increasingly, and then therequirements for leather cutting quality and efficiency were increased. High efficiencyand high quality numeric control leather cutting has become an important researchsubject in leatherware manufacturing industry, and the high speed leather cutting isthe key factor of it in practical application. Supported by "Development ofQuasi-Flexible Processing System of Leather Ware", a major scientific and technicaldeveloping project of Zhejiang province, actively absorbed the original thoughts, newtheories and technologies of correlative subjects, the kinetic control technologies forhigh speed CNC leather cutting were studied systematically.The main contents of thisdissertation are following:1, the background and significance of the research were represented, and then thedevelopment trend and current research situation of the CNC leather cutting werecommented comprehensivly. The study contents of this dissertation were proposedbased on forementioned work.2, the path optimization of leather cutting feed movement was regarded as thegeneralized salesman problem, and then the new algorithm, ant colony-nearestneighbor algorithm, was proposed to solve it based on ant colony algorithm andnearest neighbor rule. How to select the parameter of the proposed one was given indetail. The result of engineering instance shows the proposed algorithm can optimizethe length of path and increase the cutting effectively.3, several algorithms to reconstruct contour of leather pattern with parametriccurve were analyzed, it was found that reconstructing contour to discrete points withB spline curve has the characteristics of continuity, no oscillation and the precision ofthe original contour preserved, which can meet the requirements of high speed leathercutting. In local coordinate system, the comer contour model of leather pattern wasestablished, with predefined precision, algorithm to reconstruct the comer with quinticspline curve was proposed, the cutter transitioning the comer continuously wasrealized and the cutting efficiency and performance were increased.4, the dynamic characters of servo system and geometric property of leatherpattern contour to be cut were analyzed, and then how to select cutting velocity wasgiven. A new acceleration and deceleration algorithm based on piece-wise polynomialfunction was proposed, smooth transition of feed movement was realized inacceleration and deceleration process, method to solve smooth profile was given withthe proposed acceleration and deceleration algorithm in detail.5, the interpolation algorithm based on Taylor's series expansion withacceleration and deceleration algorithm before interpolation with continuous jerk wasproposed in order to improve the smooth transition performance of interpolationoutput velocity. A new interpolation algorithm based on five order predictor-corrector formula was proposed in order to reduce the fluctuation of interpolation outputvelocity.6, the developed high speed CNC leather cutting model machine was introducedbriefly.The ant colony-nearest neighbor path optimization algorithm was applied in itto generate the optimal cutting path. Transitioning comer contour algorithm,acceleration and deceleration algorithm and parametric curve interpolation algorithmwere experimented based on the developed one. The results of experiments verify theeffectiveness of algorithms proposed in chapters before and the correction of theapplied analytical methods in high speed leather cutting.7, the chief work and innovations of this dissertation were summarized, and thefurther research subjects were forecast.