Research of substrate preheating for laser metal deposition shaping
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摘要: 为了降低激光金属沉积成形过程中试样和基板间的温度梯度,减小和抑制成形过程的热应力,提高试样的成形质量,提出并设计了一种用于激光金属沉积成形的基板预热系统。该系统由基板预热器、智能比例微分积分控制器以及计算机串口温度采集反馈控制等3部分组成。利用自行研制的激光金属沉积成形设备和基板预热系统进行了成形实验。实验结果表明,基板预热可以改善试样的成形质量,降低成形过程的热应力。Abstract: In order to decrease the temperature gradient between sample and substrate,reduce and suppress the thermal stress,improve the quality of sample forming,a substrate preheating system for laser metal deposition shaping(LMDS) is developed.It consists of substrates preheater,intelligent proportion-integral-derivation controller and computer serial collecting and feedback control components.Using the self-developed LMDS system and substrate preheating system,the actual experiments are conducted.Experimental results show that substrate preheating can significantly improve the quality of the sample and reduce the thermal stress during shaping process.
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