A thermal-magnetic coupling field cooperative selective laser melting device and its heating method

Abstract

This invention discloses a thermal-magnetic coupling field cooperative selective laser melting device and its heating method. On the basis of traditional laser selective sintering heating, a magnetic field generator is introduced. During normal printing, the magnetic field generator is controlled by the control system Generate a stable static magnetic field, and provide Lorentz force through the static magnetic field to change the flow field distribution of the molten pool during the printing process of the workpiece. When the workpiece is printed to a certain thickness, the magnetic field generator is controlled to generate an alternating magnetic field to heat and temper the workpiece Heat treatment, then cool down to room temperature naturally, and continue to print the workpiece according to the above method until the printing of the workpiece is completed. In the printing process, the present invention can not only reduce the uneven effect of the workpiece produced by the Marangoni effect, but also eliminate various defects caused in the printing process, refine grains, eliminate segregation, reduce internal stress, and make the workpiece The structure and performance are more uniform, which promotes the growth of the metallographic structure of the printing material and improves the hardness and strength of the workpiece.

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] As one of the additive manufacturing technologies, Selective Laser Melting (SLM) can realize the free manufacturing from metal powder to parts. The molded parts have high dimensional accuracy and low surface roughness, and are especially suitable for the molding of parts with complex geometric structures. , Widely used in aerospace manufacturing and precision machining industries. [0003] In the process of SLM processing, due to the large temperature gradient and fast cooling rate of laser processing, 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 proces...

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Problems solved by technology

[0006] 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 printing quality and improve the quality of the finished product. Surface hardness and strength

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