Electromagnetic induction selective laser melting powder bed on-line heating system and method

Abstract

The invention discloses an electromagnetic induction selective laser melting powder bed on-line heating system and an electromagnetic induction selective laser melting powder bed on-line heating method. The system comprises a powder bed in a selective laser melting forming chamber; a metal electromagnetic induction coil is arranged above the powder bed, and is connected with an intermediate-frequency or high-frequency heating power supply; the intermediate-frequency or high-frequency heating power supply is connected with a central control unit through a control circuit; the metal electromagnetic induction coil is fixed to a nonmetal high-temperature resistant bracket; the nonmetal high-temperature resistant bracket is connected with a three-dimensional moving bracket; the three-dimensional moving bracket is fixed in the selective laser melting forming chamber; an infrared thermometer is arranged above the metal electromagnetic induction coil; the powder bed is provided with a moving powder spraying device matched with the powder bed to move; and the three-dimensional moving bracket, the infrared thermometer and the moving powder spraying device are connected with the central control unit through the control circuit. With the adoption of the method, on-line heating on the surface of the powder bed can be realized, so a temperature gradient of a forming area is reduced, when the heating temperature is high enough, and on-line annealing on a manufactured part can be realized in an SLM forming process when a heating temperature is high enough.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an electromagnetic induction laser selective melting powder bed on-line heating system and method. Background technique [0002] Due to the outstanding advantages of laser selective melting (SLM) in the preparation of high-performance and high-precision complex parts, it has become one of the hot spots in the field of additive manufacturing technology research. The core feature of laser selective melting technology is layer-by-layer processing, so as to realize the free forming of parts, and realize the shape-controlled manufacturing of parts according to the use requirements of parts. [0003] In the laser selective melting metal forming, the high-energy laser beam scans the metal powder, which will cause the printing material to experience a process of rapid heating, melting and sudden cooling and solidification. The change is to cause the increase o...

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Problems solved by technology

[0004] The method of heating the bottom of the forming platform can better achieve a uniform temperature field, thereby reducing the temperature gradient in the entire forming area, but there is a problem that the temperature in the forming height direction is limited

As the height of the formed part increases, the distance between the processing plane and the heating device becomes farther, resulting in poorer heating effect of the forming plane

Although the metal powder preheating method can also reduce the forming temperature gradient and reduce the stress to a certain extent, it has the problems of limited heating temperature and energy waste, and it cannot completely solve the warping deformation in SLM forming. question

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