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Optimizacija mehanizma upogibanja pločevine
ID Arzenšek, Anže (Author), ID Kunc, Robert (Mentor) More about this mentor... This link opens in a new window

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PID: 20.500.12556/rul/d3aa1104-b558-4630-a052-c530758292cd

Abstract
Delo obravnava dimenzijsko sintezo gibanja sedemzgibnega mehanizma na podlagi genetskega algoritma. Sedemzgibni mehanizem je del stroja za upogibanje pločevine, ki določa trajektorijo gibanja upogibne letve in obremenitveno prenosno funkcijo. Z gibanjem letve deformiramo oziroma upogibamo pločevino, njen tir gibanja pa vpliva na kakovost končnega izdelka (deformirano pločevino) in velikost obremenitev v mehanizmu. V nalogi je opisan postopek izdelave optimizacijskega algoritma, ki na podlagi izračuna kinematičnih točk mehanizma, približa gibanje upogibne letve referenčnemu tiru. Referenčni tir opiše idealni tir gibanja upogibne letve, katerega oblika in velikost je odvisna od geometrije stroja in debeline pločevine, njegovi dve glavni prednosti pa sta: gibanje letve brez poškodovanja pločevine in zmanjšanje skupne sile z ničnim relativnim gibanjem letve glede na deformacijo pločevine. Razvit je optimizacijski 2D model sedemzgibnega mehanizma gibanja letve, ki na osnovi velikosti oblikovnih spremenljivk poda dejanski tir mehanizma, namenska funkcija pa izračuna odstopanje tira gibanja letve od referenčnega tira. Na podlagi različnih velikost mehanizma in njihovih vrednostih namenskih funkcij, genetski algoritem poišče najprimernejšo rešitev, katere tir gibanja je najprimernejši. Razvit algoritem je sestavljen tako, da s spreminjanjem konstantnih oblikovnih spremenljivk spreminjamo velikost in obliko optimiziranega mehanizma, tir gibanja pa se ohrani. Tako dobimo več različnih oblik mehanizma s podobnim tirom in povečamo možnost izbere najprimernejšega.

Language:Slovenian
Keywords:mehanizmi, kinematika, sinteza, genetski algoritem, upogibanje pločevine
Work type:Master's thesis/paper
Organization:FS - Faculty of Mechanical Engineering
Year:2018
PID:20.500.12556/RUL-100165 This link opens in a new window
Publication date in RUL:12.03.2018
Views:2210
Downloads:540
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Secondary language

Language:English
Title:Optimization of mechanism for sheet metal bending
Abstract:
The paper deals with the dimensional synthesis of movement of a seven-bar mechanism based on the genetic algorithm. The seven-bar mechanism is part of a sheet metal bending machine which defines the trajectory of the movement of the bending beam and the load transmission function. By moving the beam the sheet metal is deformed or bent, and its path of the movement affects the quality of the finished product (deformed sheet metal) and the size of the load in the mechanism. The thesis describes the process of creating an optimization algorithm that, based on the calculation of kinematic points of the mechanism, approaches the motion of the bending beam to the reference path. The reference path describes the ideal path of the movement of the bending beam, the shape and size of which depend on the machine geometry and the sheet metal thickness. Its two main advantages are the movement of the beam without damaging the sheet metal and reduction of the total force with the zero relative motion of the beam in relation to the sheet metal deformation. An optimization 2-D model of the seven-bar mechanism of the beam motion has been developed, which, on the basis of the size of the design variables, gives the actual path of the mechanism, and the goal function calculates the deviation of the path of the movement of the beam from the reference path. On the basis of different sizes of the mechanism and their values of goal functions, the genetic algorithm seeks the most appropriate solution, the path of the movement of which is most appropriate. The structure of the developed algorithm is such that by changing the constant design variables the size and shape of the optimized mechanism change as well, while the path of the movement is maintained. Thus, several different shapes of the mechanism with a similar path are obtained, and the choice of the most suitable one is increased.

Keywords:mechanisms, kinematics, synthesis, genetic algorithm, sheet metal bending

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