| 徐海岩,李涛,李海波,王鑫林,张洪潮.激光熔覆成形薄壁件离焦量和Z轴提升量选择方法[J].,2017,57(6):557-563 |
| 激光熔覆成形薄壁件离焦量和Z轴提升量选择方法 |
| Method to select defocused amount andZ-increments in forming thin-walled part with laser cladding |
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| DOI：10.7511/dllgxb201706002 |
| 中文关键词:激光技术薄壁件成形离焦量Z轴提升量 |
| 英文关键词:laser technologythin-walled parts formingdefocused amountZ-increments |
| 基金项目:国家自然科学基金资助项目(51775086). |
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| 摘要点击次数:1353 |
| 全文下载次数:1332 |
| 中文摘要: |
| 离焦量和Z轴提升量影响激光熔覆成形薄壁件的精度和效率，得到高精度薄壁件的关键是使Z轴提升量等于初始离焦量下的熔覆高度．为了解决高精度、高效率激光熔覆成形薄壁件问题，基于概率学构建了同轴送粉式激光熔覆系统的粉末分布密度模型，得到了不同负离焦量下熔覆高度计算公式并进行实验验证．提出了任意负离焦量和Z轴提升量下多层熔覆成形薄壁件高度的计算方法并进行实验验证．结果表明多层熔覆成形薄壁件高度的计算结果与实验结果基本一致，选择尽可能大并且能够形成自愈合作用的负离焦量，并使Z轴提升量等于该离焦量对应的熔覆高度计算值，可以得到成形效率高、精度高的薄壁件． |
| 英文摘要: |
| Defocused amount and Z-increments affect the accuracy and efficiency of thin-walled part with laser cladding forming. The key to obtain high-accuracy thin-walled part is to make the Z-increments equal the cladding height under initial defocused amount. In order to solve the problem of forming thin-walled part with high accuracy and efficiency, powder density distribution model of laser cladding system with coaxial-powder feeding is established based on the probability theory, the calculation formula of cladding height under different negative defocused amounts is given and experimentally verified. The calculation method of multi-layer cladding forming thin-walled part height under any negative defocused amount and Z-increment is proposed and experimentally verified. The results show that calculations of multi-layer cladding forming thin-walled part height are in accordance with experiments. Selecting self-regulation-effect negative defocused amount as large as possible, and making Z-increments equal the calculated value of cladding height under this defocused amount, the thin-walled parts with high forming efficiency and high accuracy can be obtained. |
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