预载荷下钛合金薄板的激光弯曲

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英文篇名：Laser bending of titanium alloy sheet with preload 作者：张永春 英文作者：Zhang Yongchun;Applied Technology College,Dalian Ocean University; 关键词：预载荷 ; 钛合金薄板 ; 激光弯曲 ; 弯曲角度 英文关键词：preload;;titanium alloy sheet;;laser bending;;bending angle 中文刊名：DYJE 英文刊名：Forging & Stamping Technology 机构：大连海洋大学应用技术学院; 出版日期：2015-03-25 出版单位：锻压技术 年：2015 期：v.40;No.234 基金：辽宁省教育厅2014年科学研究一般项目(L2014287) 语种：中文; 页：DYJE201503016 页数：4 CN：03 ISSN：11-1942/TG 分类号：72-75

摘要

针对钛合金薄板在室温下弯曲时,因回弹量大而难以成形,提出在预载荷下钛合金薄板激光弯曲的新方法。该方法是先用专用的工装夹具使薄板发生预变形,然后用一定强度的激光束按照设计路径在薄板表面上扫描,通过激光的热效应降低扫描区域材料的屈服强度并增强其塑性变形能力,实现工件的精确成形。以钛合金Ti-5Al-2.5Sn薄板为研究对象,进行了预载荷下激光弯曲的可行性试验。结果表明,当预载荷越大或扫描速度越小时,弯曲角度越大。阐述了预载荷下激光弯曲的机理及主要的影响因素。
        For the problem that it is difficult for titanium alloy sheet to form the required shape due to large spring-back when it is bent at room temperature,a new method of laser bending titanium alloy sheet with preload was put forward. Firstly titanium alloy sheet was predeformed by a fixture,then its surface was scanned by the laser beam with a certain intensity along the given path,and it was formed precisely due to the thermal effect of the laser to reduce the yield strength of the scanning area of materials and improve its plastic deformation ability. A feasibility test of laser bending with preload for Ti-5Al-2. 5Sn alloy sheet was done. The experimental results show that the larger is the preload or the slower is the laser scan speed,the bigger is the bending angle. Laser bending mechanism with preload was described and its main influence factors were analyzed.

引文

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