Study on calculation of minimum laser energy of sheet metal deformation by laser shock forming

YANG Chao-jun; ZHOU Jian-zhong; ZHANG Yong-kang; ZHANG Fang

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Study on calculation of minimum laser energy of sheet metal deformation by laser shock forming

更新时间：2020-08-12

- Study on calculation of minimum laser energy of sheet metal deformation by laser shock forming
- Optics and Precision Engineering Vol. 14, Issue 3, Pages: 396-401(2006)
- 作者机构：
  
  1. 江苏大学机械工程学院,江苏镇江 212013
  2. 沙洲职业工学院机电工程系,江苏张家港,215600
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN249;TG156.99
- Received：14 June 2005，
  
  Revised：20 April 2006，
  
  Published Online：30 June 2006，
  
  Published：30 June 2006
- 稿件说明：
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YANG Chao-jun, ZHOU Jian-zhong, ZHANG Yong-kang, et al. Study on calculation of minimum laser energy of sheet metal deformation by laser shock forming[J]. Optics and precision engineering, 2006, 14(3): 396-401.
DOI：

YANG Chao-jun, ZHOU Jian-zhong, ZHANG Yong-kang, et al. Study on calculation of minimum laser energy of sheet metal deformation by laser shock forming[J]. Optics and precision engineering, 2006, 14(3): 396-401. DOI：

摘要

介绍了激光冲击板料变形的机理和冲击波产生的原因

提出了激光冲击板料变形中激光－能量转换体－靶材系统的爆轰波压力估算式。根据此压力估算式和材料的动态屈服强度

对激光冲击板料变形中所需的最小激光能量进行了估算

板料厚度为0.5 mm

约束凹模孔径

20 mm

在光斑直径6 mm

脉宽25 ns条件下的不锈钢靶材变形所需的最低脉冲能量大约为11 J。实验结果表明估算的最小激光能量与板料变形所需的能量阈值基本一致

且板料变形量随激光能量的增加呈非线性增大。最小激光能量的估算以及能量与板料变形的实验研究为板料变形的精确控制和预测提供了理论依据。

Abstract

The mechanism of laser shock deformation and the reasons of producing the shock wave were introduced

and the estimated formula of shockwave pressure was put forward

which shows clearly the relation between the peak value of shockwave and the overlay

energy absorbed layer

sheet metal properties and laser parameters. Based on both the formula and the tensile yield strength of sheet metal

minimum laser energy needed by deformation was estimated

the results show that the lowest pulse energy needed by the target deformation of stainless steel is about 11 J under the conditions of sheet thickness of 0.5 mm

the bore diameter of cavity die of 20 mm

the beam diameter of 6 mm and the pulse width of 25 ns. The experimental results also show that minimum energy calculation accords with critical value of deformation

and the deformation increases with the increase of laser energy in a nonlinear way. By studying on the calculation of minimum laser energy and the deformation experiment

the paper provides exactly a theoretical foundation for controlling and predicting deformation of sheet metal.

关键词

Keywords

references

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