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Fast forming method of fusion of metal powder of three beams of laser compound scanning

A technology of metal powder and composite scanning, which is applied in the direction of improving process efficiency and energy efficiency, can solve the problems of non-negligible heat conduction of machine parts, hinder the normal operation of the machine, and damage machine parts, so as to ease the stress field and reduce the Small cracks and warping, slowing down the effect of drastic changes

Active Publication Date: 2009-12-23
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the entire forming device is composed of metal parts, and the heat conduction of the machine parts cannot be ignored during the overall preheating: the overall preheating of the powder bed will easily lead to the operating temperature of various electrical systems such as motors, laser scanning systems, and lasers. If it is too high, it will hinder the normal operation of the machine or even damage the machine parts

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  • Fast forming method of fusion of metal powder of three beams of laser compound scanning

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example 1

[0028] The spherical 316L stainless steel powder with a particle size of 20 microns is selected for SLM forming, and three-beam laser composite scanning is used to prepare metal parts with low stress, no warping, and uniform structure. The part graphics are designed by CAD software, processed by slicing software and path software, saved as STL, and input into SLM equipment for SLM forming. The specific scanning method of each layer is as follows:

[0029] Use CO 2 The laser is used as the first laser beam, the laser power is set to 50W, the scanning speed is 200mm / s, and the 316L stainless steel powder bed is scanned and preheated along the set scanning path;

[0030] Use the fiber laser as the second laser beam, set the laser power to 200W, and the scanning speed to 200mm / s, scan and melt along the scanning path, and make the position of the second laser spot be behind the scanning direction of the first laser spot with a distance of 0.1 mm;

[0031] Use CO 2 The laser is ...

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Abstract

The invention discloses a fast manufacturing method of three-beam laser compound scanning. The method comprises the following steps of: firstly utilizing long-wavelength laser (CO2 laser) for preheating the metal powder, then utilizing short-wavelength laser (YAG or optical fiber laser) for fusing the metal powder and finally utilizing long-wavelength laser (CO2 laser) to carry out heat treatment to the frozen metal. The fast manufacturing method uses the three beams of laser to carry out compound scanning, namely uses long-wavelength laser to preheat, short-wavelength laser to fuse and then long-wavelength laser to carry out heat treatment, can realize the compound process of preheating, fusion and heat treatment of the metal powder. The three beams of laser compound scanning mode can reduce internal stress of the metal part, avoid warping and cracking, improve organization and improve performance.

Description

technical field [0001] The invention belongs to the field of rapid manufacturing, and specifically relates to a compound scanning rapid prototyping method of two long-wavelength lasers (carbon dioxide) and one short-wavelength laser (optical fiber or Nd:YAG), which can realize micro-area preheating / melting / heat treatment of metal powder process. Background technique [0002] The rapid prototyping device that adopts Selective Laser Melting (Selective Laser Melting, SLM) technology to directly manufacture metal parts has been reported, see "A kind of rapid prototyping system for directly manufacturing metal parts" (publication number is: CN1631582A, and the public date is: June 29, 2005). While they enable direct fabrication of arbitrarily complex metal parts, such scanning devices do not have a preheating system. In this case, the metal powder is scanned by the rapidly moving laser beam and undergoes rapid melting and rapid solidification, and the temperature field distribu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 史玉升李瑞迪魏青松王志刚
Owner HUAZHONG UNIV OF SCI & TECH
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