Thermo-magnetic coupling field cooperated selective laser-melting device and heating method thereof

Abstract

The invention discloses a thermo-magnetic coupling field cooperated selective laser-melting device and a heating method thereof. The thermo-magnetic coupling field cooperated selective laser-melting device is characterized in that a magnetic field generator is introduced on the basis of conventional laser selective sintering and heating; during normal printing, a control system controls the magnetic field generator to generate stable static magnetic fields; the static magnetic fields provide lorentz force to change flow field distribution, in a workpiece printing process, of a molten pool; when a workpiece is printed and accumulated to certain thickness, the magnetic field generator is controlled to generate alternating magnetic fields for heating, tempering and thermally treating the workpiece, and then naturally cooling the workpiece to the room temperature; and workpiece printing is continued according to the method until workpiece printing is ended. In a printing process, an unevenworkpiece effect generated by the Marangoni effect can be reduced, various defects caused by the printing process further can be eliminated, crystalline grains are refined, segregation is eliminated,and internal stress is reduced, so that the structure and the performance of the workpiece are more uniform, and therefore, growth of a metallographic structure of a printing material is promoted, and hardness and strength of the workpiece are improved.

Description

technical field [0001] The invention belongs to the technical field of metal 3D printing additive manufacturing, and relates to a 3D printing heating device, in particular to a thermomagnetic coupling field cooperative selective laser melting device and a heating method thereof. Background technique [0002] 1. As one of the additive manufacturing technologies, Selective Laser Melting (SLM) can realize free manufacturing from metal powder to parts. The molded parts have high dimensional accuracy and low surface roughness, and are especially suitable for parts with complex geometric structures. The molding is widely used in aerospace manufacturing and precision machining industries. [0003] 2. In the process of SLM processing, due to the large temperature gradient of laser processing and the fast cooling rate, it is easy to cause defects such as uneven grain size inside the workpiece, coarse grains in some parts, and large residual stress on the surface. However, the SLM pr...

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Problems solved by technology

[0006] 1 In order to change the phenomenon of coarse grains, cracks, excessive residual stress and low hardness in the SLM manufacturing process, the present invention proposes to couple the magnetic field and temperature field to the metal 3D printing equipment to improve the quality of printing and improve the quality of finished products. surface hardness and strength

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