基于梯度降温的叠层制备热残余解析解

发布时间：2017-12-27 00:20

本文关键词：基于梯度降温的叠层制备热残余解析解　出处：《现代制造工程》2017年11期 　论文类型：期刊论文

【摘要】：叠层制备工件因高温制备环境易出现热残余应力和变形。实际制备工艺因制备时间差会产生降温梯度,充分考虑成型过程中沿厚度方向形成的温度梯度,建立了热残余变形和应力的解析解。根据具体的叠层工艺,采用不同的梯度降温模式。算例表明,梯度降温会造成显著的热残余现象;讨论了4种梯度降温模式对热残余程度的影响;合理解释了工件因降温梯度会产生明显的弯曲变形;揭示了弯曲变形实际上是工件降低残余应力的调节机制,以增大弯曲变形为代价来降低残余应力。研究结果为叠层制备工艺优化提供了可靠的理论依据。
[Abstract]:The residual stress and deformation of the laminated workpiece are easy to occur because of high temperature preparation. Due to the poor preparation time, the temperature gradient will be produced due to the poor preparation time. The analytical solution of thermal residual deformation and stress is established considering the temperature gradient along the thickness direction during the forming process. According to the concrete stacking process, different gradient cooling modes are adopted. Numerical examples show that the temperature gradient will cause significant thermal residual phenomenon; discusses the cooling mode of the 4 gradient effect on thermal residual degree; explain the workpiece deformation obviously due to temperature; reveals the bending deformation of workpiece is actually reducing the residual stress of the adjustment mechanism, in order to increase the bending deformation of the cost to reduce the residual stress. The results provide a reliable theoretical basis for the optimization of laminated preparation.
【作者单位】：淮海工学院机械工程学院;
【基金】：江苏省重点学科资助项目(苏财教[2014]-98-96)
【分类号】：TH16
【正文快照】： 0引言叠层制造(Laminated Object Manufacturing,LOM),是广义的工件逐层制备技术的总称,包括传统的狭义分层实体成型技术、以三维打印为代表的增材制造技术、粉末激光烧结和熔融堆积成型技术以及为表面改性在基体上制备涂层的技术。这些技术和工艺之所以归类为广义的叠层制造,

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