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Study of Morphology Optimization and Tribological Properties on the Drawing Mold Surface by Laser Texturing

Author: FanBinBin
Tutor: LuoZhiGao
School: Jiangsu University
Course: Mechanical Manufacturing and Automation
Keywords: Drawing forming Laser texturing Numerical Optimization Friction model Friction test
CLC: TG386.52
Type: Master's thesis
Year: 2009
Downloads: 115
Quote: 0
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Abstract


The quality of the mold is affecting the performance quality of material forming one of the key factors, there is an urgent need to study to improve the quality of sheet metal forming new method. In this paper, to fully understand the application of laser texturing technique based on the situation at home and abroad, combined with numerical optimization tribological performance test results of the main building articles, morphologies using optimization methods for numerical optimization of the friction coefficient and the use of laser hair Changeling appearance of friction test for numerical optimization results validated so as to optimize the laser hair purpose of geometric shape parameters. Research is mainly reflected in the following aspects: First, according to the curved parts of the drawing forming bucket numerical simulation, discusses the flow of sheet metal flange surface friction important influence on the forming properties; also analyzed drawing molding process in different regions of the mold surface friction model and laser texturing morphology Technical characteristics and mechanism of action, for the distribution of laser texturing topography optimization study provides a theoretical basis. Secondly, the process according to the drawing forming a friction model, considering the asperity contact with each other from the adhesion occurs when the frictional force, shear force molecular film border furrows and lubricant shear strength, friction coefficient to create a simple mathematical model. The mathematical model to characterize the friction coefficient and geometric parameters (asperity number n, asperity height h, spherical asperity radius R) relationship. The mathematical model using optimization methods function as the minimum value of the objective function at equally spaced asperity to n, h, R as a variable, select Expert empirical relationships function as constraints, using mixed penalty function iteration method for solving constrained multivariate optimization problem. Combined with the actual situation exhaustive list n values, corresponding to each n, the variable h and R and its mathematical model optimal solution. Finally, the laser texturing surfaces rubbing pilot study selected five samples as the research object, based on the optimization results, the required processing of the experimental morphology, friction performance tests on the specimen, and the test results obtained with The results were compared with numerical optimization, optimization basically consistent with the experimental results, the results illustrate the effectiveness of numerical optimization, numerical optimization can be used for drawing die surface laser texturing topography optimization. The results show that: In the case of certain process conditions surface friction coefficient on the drawing pieces influenced by the force, when conditions permit, under the premise of drawing die surface morphology changes to improve the forming quality is better, proved by numerical optimization a different morphology parameters of laser hair get different tribological properties, using numerical optimization can obtain reliable texturing topography geometry. According to the obtained parameters for drawing mold surface texturing, and then get the top surface of the distribution of the drawing die surface friction coefficient.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Cold stamping ( sheet metal processing) > Cold stamping process
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