Solidification structure and forming stress regulation and control method for laser coaxial powder feeding additive manufacturing
A solidification structure and additive manufacturing technology, which is applied in the control field of laser coaxial powder feeding additive manufacturing, can solve problems such as cracking of formed parts, achieve the effects of reducing internal stress, reducing temperature gradient, and suppressing crack defects
Active Publication Date: 2020-04-10
NAT INST CORP OF ADDITIVE MFG XIAN
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Problems solved by technology
[0005] In order to improve the mechanical properties of laser deposition forming parts and avoid the cracking of forming parts in the process of laser deposition forming, the present invention proposes a solidification structure and forming stress control method for laser coaxial powder feeding additive manufacturing
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] Such as figure 1 As shown, the laser additive manufacturing device includes a forming processing head, a first laser, a second laser, a workbench for placing a substrate, and a powder feeder; wherein, the laser beam emitted by the first laser is output through the forming processing head for Deposition shaping and solidification tissue refinement and regulation; the first laser has two optional working modes of continuous laser and quasi-continuous laser; the second laser is equipped with a variable magnification collimator, and can change its The inclination angle of the laser output relative to the laser light path of the first laser, the output laser beam spot and the laser beam spot output by the forming processing head keep the geometric center coincident, but the spot size is larger than the laser beam spot size output by...
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Abstract
The invention discloses a solidification structure and forming stress regulation and control method for laser coaxial powder feeding additive manufacturing. The method specifically comprises the stepsthat: solidification structure regulation and control is performed, specifically, the temperature field regulation and control parameter and nucleation regulation and control parameter of a needed solidification structure are determined through employing a temperature field regulation and control technology and a nucleation regulation and control technology; and stress regulation and control is performed, specifically, auxiliary laser preheating and slow cooling parameters are determined by adopting an auxiliary laser preheating and slow cooling technology. According to the method of the invention, temperature field regulation and control and heterogeneous nucleation regulation and control are additionally adopted; a powder feeding amount, auxiliary laser and a forming main laser couplingeffect in a forming process are regulated, so that laser deposition forming, molten pool preheating and slow cooling and deposited layer solidification structure regulation and control are achieved;temperature gradient in a deposition forming process can be effectively reduced; internal stress is reduced; crack defects are inhibited; the structure of a formed part is regulated and controlled; and the limitation of the size and shape of the formed part is avoided.
Description
technical field [0001] The invention belongs to the field of laser deposition forming additive manufacturing, and relates to a control method for laser coaxial powder feeding additive manufacturing. Background technique [0002] Laser deposition forming technology can realize the moldless rapid near-forming of high-performance dense metal parts, and the forming size is basically unlimited. It can also realize the arbitrary compounding and gradient structure manufacturing of multiple materials on the same component. [0003] However, the deposition state of laser deposition formed parts has a typical epitaxial growth columnar grain structure, and the mechanical properties have obvious anisotropy, which does not meet the requirements of comprehensive mechanical properties; on the other hand, different parts of the same part may be subjected to different stress conditions, a single The organization cannot meet usage requirements. [0004] In addition, due to the high energy de...
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Patent Timeline
Login to View More IPC IPC(8): B22F3/105B33Y10/00B33Y30/00B33Y40/10B33Y40/20B33Y50/02
CPCB33Y10/00B33Y30/00B33Y40/00B33Y50/02B22F10/00B22F12/45B22F10/36B22F10/25B22F12/17B22F10/22Y02P10/25
Inventor 薛飞李勉冯言高洁张智卢秉恒
Owner NAT INST CORP OF ADDITIVE MFG XIAN