Self-Regulation-Effect in Laser Direct Metal Manufacturing

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Self-Regulation-Effect in Laser Direct Metal Manufacturing

更新时间：2025-07-09

- Self-Regulation-Effect in Laser Direct Metal Manufacturing
- Vol. 44, Issue 11, Pages: 77-81(2010)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN249
- Online First：10 November 2010，
  
  Published：2010
- 稿件说明：
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Self-Regulation-Effect in Laser Direct Metal Manufacturing[J]. 2010, 44(11): 77-81.
DOI：

Self-Regulation-Effect in Laser Direct Metal Manufacturing[J]. 2010, 44(11): 77-81. DOI：

摘要

为了在开环控制条件下直接制备出表面平整的薄壁零件

针对同轴送粉条件下粉末离焦对单道熔覆层厚度的影响

建立了理论模型

分析了成形表面出现的凹凸不平现象

对激光离焦和粉末离焦对单道熔覆层形貌的影响进行了实验研究.研究表明

激光离焦主要影响单道熔覆层的宽度

而粉末离焦主要影响单道熔覆层的厚度.在粉末负离焦条件下

激光金属直接成形过程具有形貌自稳定效应

能消除成形层的凹凸现象

从而制造出成形表面平整的薄壁零件样件.由于计算结果与实验结果的趋势能保持一致

形貌自稳定效应能够提高开环系统下薄壁零件的制造精度

因此具有实际的应用价值.

Abstract

To fabricate fine thin-wall parts with smooth surface by open-loop laser direct metal manufacturing(LDMM)system

the uneven formed surface in forming process is analyzed and the effect of off-focused laser and off-focused powder on the shape of single-trace cladding layer

is investigated by single-trace cladding experiments. The results show that off-focused laser exerts a significant effect the thickness of single-trace cladding layer

and off-focused powder affects mainly the height of single-trace cladding layer. It is suggested that self-regulation-effect in the process of LDMM in the condition of negative off-focused powder enables to perfect the uneven shaped surface caused by instability of process parameters. The theoretical model of the influence of off-focused powder on deposition thickness in the condition of coaxial powder feeding is constructed

and regular pattern obtained from the model matches well with experimental results. Several thin-wall parts with smooth formed surface are fabricated in terms of the self-regulation-effect.

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Keywords

references

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