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Theoretical and Experimental Study on Laser Punching of Sheet

Author: ShiJianGuo
Tutor: ZhangYongKang
School: Jiangsu University
Course: Mechanical Manufacturing and Automation
Keywords: Laser shock wave Punching Mechanism Fracture characteristics
CLC: TG506
Type: Master's thesis
Year: 2007
Downloads: 36
Quote: 0
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Abstract


In this paper, the concept of a laser based on laser -induced shock wave mechanical effects punching on the basis of analysis of the impact of laser processing technology at home and abroad , and sheet metal forming technology research , its principle is to use a high power density (GW / cm ~ 2 amount grade), the strong laser of short pulses (ns magnitude) irradiating the sheet metal material , the surface coating of the sheet due to the absorption of the laser energy instantaneously gasified ionization , forming a plasma the plasma explosion produced high - pressure shock wave transmission to the workpiece , in the shock wave and the die together , the sheet metal is plastically deformed until the shear fracture through hole is formed . Laser punching mechanism , experiments and related technical exploration of basic research and innovation . First, the theory expounded the formation mechanism of the laser plasma shock wave , laser shock wave peak pressure calculated in different constraint mode , the peak laser shock pressure calculation model correction . Analysis of the mechanism of laser shock wave propagation and attenuation , and constrained layer and the principle of selecting discussed . Further, based on the mold punching mechanism and laser shock wave theory , the establishment of a model of the laser punching . The article analyzes the the laser punching process , the theoretical speed of the laser plasma shock wave and its momentum giving sheet , and in accordance with the momentum theorem, the derivation of the sheet separation occurs the required minimum speed . Finally, the experimental methods studied laser parameters of the laser punching , sheet parameters , the impact of the die aperture, the shape of the die hole , the boundary conditions of the laser punching results observed variation of the thickness of the edge of the rear aperture of the laser punching , and by the SEM photographs observation sheet fracture surface morphology , analysis of the characteristics of the cross-section of the fracture in the brittle the material ductile iron sheet after punching , laser shock under high strain rate reaching laser punching the plastic brittle materials the conclusion of the deformation .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > General issues > Metal cutting process
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