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异形基面平顶薄壁结构激光熔覆成形工艺研究

Laser Cladding Forming Technology of Flat-Top Thin-Walled Part Based on Special-Shaped Base Surface

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摘要

采用中空激光光内送粉技术,在异形基面上成形平顶薄壁结构。针对在不平整异形面上采用传统等高分层存在扫描起始端搭接缺陷、效率低等问题,提出了一种随形分层的方法:利用在一定范围内熔覆层高度与扫描速度之间、熔覆层宽度与离焦量之间的线性关系,采用分段变速以达到分段变熔高的方法使基底低点变高,从而在异形基面上逐渐堆积出平顶结构。检测结果表明:基面与层间实现了冶金结合,成形的薄壁墙顶面基本平整,最大绝对误差在0.2 mm左右,尺寸误差在8%以内;成形区域的组织致密均匀,无明显的气孔、裂纹等缺陷,显微硬度为685~720 HV。

Abstract

A flat-top thin-walled structure is formed on a special-shaped base surface using hollow laser-light internal powder-feeding technology. A method of fractal stratification is proposed to solve problems of lap defects of scanning initiating terminal and low efficiency when the traditional equal-high stratification is used on uneven special surfaces. This method uses the linear relationship among the cladding height, scanning speed, cladding layer width, and defocusing amount in a certain range. A segmented variable speed is used to achieve the segmented melting height, so that the substrate low point is raised and a flat top structure is gradually added on the top of the special-shaped base surface. Test results demonstrate that, by combining the base surface and interlayer, the top surface of the thin-walled structure is typically flat. It has a maximum absolute error of approximately 0.2 mm, with a size error within 8%; the forming region''s microstructure is dense and uniform without obvious pores, cracks, or other defects;the range of microhardness is 685-720 HV.

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中图分类号:TN249

DOI:10.3788/CJL201946.1102002

所属栏目:激光制造

基金项目:国家重点研发计划、国家自然科学基金;

收稿日期:2019-04-11

修改稿日期:2019-06-21

网络出版日期:2019-11-01

作者单位    点击查看

李东升:苏州大学机电工程学院, 江苏 苏州 215021
石拓:苏州大学光电科学与工程学院, 江苏 苏州 215006
石世宏:苏州大学机电工程学院, 江苏 苏州 215021
蒋伟伟:苏州大学机电工程学院, 江苏 苏州 215021
李刚:苏州大学机电工程学院, 江苏 苏州 215021
苏昊:苏州大学机电工程学院, 江苏 苏州 215021
王暑光:苏州大学机电工程学院, 江苏 苏州 215021

联系人作者:石拓(shituo@suda.edu.cn)

备注:国家重点研发计划、国家自然科学基金;

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引用该论文

Li Dongsheng,Shi Tuo,Shi Shihong,Jiang Weiwei,Li Gang,Su Hao,Wang Shuguang. Laser Cladding Forming Technology of Flat-Top Thin-Walled Part Based on Special-Shaped Base Surface[J]. Chinese Journal of Lasers, 2019, 46(11): 1102002

李东升,石拓,石世宏,蒋伟伟,李刚,苏昊,王暑光. 异形基面平顶薄壁结构激光熔覆成形工艺研究[J]. 中国激光, 2019, 46(11): 1102002

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