Selective laser forming metal powder preheating method and device

A metal forming and selective laser technology, which is applied in the field of additive manufacturing, can solve the problems of powder agglomeration, sharp increase in processing costs, and unusable powder, so as to reduce thermal stress and thermal deformation, improve the precision and surface quality of parts, The effect of improving performance

Inactive Publication Date: 2016-08-24
北京隆源自动成型系统有限公司
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Problems solved by technology

If the temperature of this heating method is too high, it will lead to agglomeration of laser unsintered powder outside the workpiece, which will cause great inconvenience to the subsequent powder processing, and even make the powder unusable, and the processing cost will increase sharply

Method used

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  • Selective laser forming metal powder preheating method and device
  • Selective laser forming metal powder preheating method and device

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Embodiment Construction

[0019] refer to figure 1 As shown, the metal powder preheating and scanning processing are the same laser scanning system. Before processing, the substrate heating device 4 first heats the substrate 5 to the required preheating temperature, and starts to spread the powder, and then according to the laser power and spot size of the metal powder preheating , scanning speed and other parameters to scan and heat the cross-section of the layer of the workpiece, and then scan and process the cross-section of the layer again according to the parameters of the workpiece processing, so that the cycle is repeated until the final processing is completed.

[0020] refer to figure 2 As shown, metal powder preheating and scanning processing each have an independent laser scanning system. Before processing, the substrate heating device 4 firstly heats the substrate 5 to the required preheating temperature, starts to spread the powder, and then the preheating laser scanning system checks the...

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Abstract

The invention provides a selective laser forming metal powder preheating method and device. The device comprises a substrate heating device on a forming cylinder piston. Before machining starts, the substrate heating device preheats a substrate to preset temperature, heating is conducted by carrying out laser scanning on metal powder on the section of a workpiece after powder laying and machining, and accordingly the metal powder is preheated. Thus, thermal stress and thermal deformation of the workpiece can be greatly reduced, gas residues among powder can be greatly reduced, and accordingly the aim of improving precision, surface quality and mechanical performance of the workpiece is achieved.

Description

technical field [0001] The invention relates to a method and device for preheating metal powder in selective laser forming, belonging to the field of additive manufacturing. Background technique [0002] 3D printing technology has recently been widely recognized and developed rapidly. Among them, metal powder selective laser sintering technology is currently the fastest-growing and most dynamic molding technology, which can directly print metal parts. Since laser melting metal powder is a metallurgical process, the precision, surface quality and mechanical properties of the workpiece are not only related to the quality of metal powder and laser process parameters, but also have a lot to do with thermal stress, thermal deformation and gas residue between powders during processing. Preheating the metal powder during processing can effectively reduce the temperature gradient, reduce the thermal stress and thermal deformation of the workpiece, and effectively improve the precisi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y30/00B33Y10/00
CPCB33Y10/00B33Y30/00B22F10/00B22F12/44B22F12/49B22F10/28B22F12/41B22F10/362B22F12/17B22F12/63Y02P10/25
Inventor 普雄鹰李全贵袁晓鑫徐春丽王林
Owner 北京隆源自动成型系统有限公司
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