Device and method for alleviating part stress by means of electromagnetic induction in additive manufacturing of powder bed

Abstract

The invention discloses a device for alleviating part stress by means of electromagnetic induction in additive manufacturing of a powder bed. The device is characterized by comprising a forming cylinder, wherein a driving motor is arranged in the forming cylinder; an output shaft of the driving motor is connected to a ball lead screw mechanism; the other end of the ball lead screw mechanism is connected to a heating substrate; electromagnetic generators are integrated around the heating substrate; electromagnetic inducers are arranged around the upper end of the outer wall of the forming cylinder; the electromagnetic inducers are connected to a first electromagnetic generating power supply; the electromagnetic generators are connected to a second electromagnetic generating power supply; and the first electromagnetic generating power supply and the second electromagnetic generating power supply are connected to a master control system of equipment. By adopting a direct flow magnetic field to apply disturbance to leading edge momentum of a liquid-solid interface and solute transmission in a solidification process of a laser molten pool, the solidified crystal state of the liquid-solid interface is changed, so that a purpose of controlling the phase change stress in the solidification process of the laser molten pool is achieved. The invention also discloses a method for alleviating part stress by adopting the device.

Description

technical field [0001] The invention belongs to the technical field of powder bed laser selective melting and additive manufacturing equipment, and relates to a device for reducing stress of parts by electromagnetic induction in powder bed additive manufacturing, and also relates to a method for reducing stress of parts by using the device. Background technique [0002] Laser selective melting (SLM) forming technology is a point-by-point, layer-by-layer accumulation forming 3D printing technology developed in recent decades. The three-dimensional solid of the component is obtained by layer-by-layer accumulation method. SLM forming technology can realize mold-free and rapid free forming of dense metal with complex structure and high performance. SLM technology integrates many advanced technologies such as laser technology, computer technology, numerical control technology and material technology. The performance of processed parts is equivalent to that of forgings. Since S...

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Problems solved by technology

[0004] The above patents are all based on the principle of eddy currents induced by alternating magnetic fields in electromagnetic induction, but there has been no such use of DC magnetic fields to disturb the momentum and solute transmission at the front of the liquid-solid interface during the solidification process of the laser molten pool to change the liquid-solid interface. The solidification crystal form, and then achieve the purpose of controlling the phase transition stress during the solidification process of the molten pool Technical records

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