Electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device and method

Abstract

The invention provides an electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device and method and belongs to the technical field of laser additive manufacturing. The device comprises a coaxial powder feeding laser deposition system and an electromagnetic induction heating synchronous auxiliary system. The coaxial powder feeding laser deposition system comprises a base plate, a deposition sample, a laser head and an infrared thermometer. The electromagnetic induction heating synchronous auxiliary system comprises an electromagnetic induction powersupply auxiliary unit, a coil, a steering heightening mechanism, a driven shaft and a transverse sliding groove. The coil is connected to the output end of the electromagnetic induction power supplyauxiliary unit. The coil and the laser head do synchronous movement to implement small-area real-time preheating and slow cooling on the deposition sample. The electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device can implement real-time preheating and slow cooling, reduce residual stress and the tearing tendency and improve the mechanical performance of a titanium matrix composite. The electromagnetic induction coil and the laser head do synchronous movement through the steering heightening mechanism to implement real-time small-area preheating and slow cooling on high-height big parts during laser additive manufacturing. The electromagnetic induction heating device doing synchronous movement with the laser head implements synchronous preheating and slow cooling on a base plate and a deposited layer, and thermal stress during laser additive manufacturing is reduced. The electromagnetic induction heating assisted titanium matrix composite laser additive manufacturing device can realize online annealing on a specific area by changing the position of the coil.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, mainly aims at the technical field of coaxial powder feeding laser additive manufacturing, and specifically relates to a device and method for electromagnetic induction heating-assisted laser additive manufacturing of titanium-based composite materials. Background technique [0002] At present, laser additive manufacturing technology is mainly divided into two mainstream technologies: selective laser melting based on powder spreading and direct laser melting deposition based on powder feeding. However, there are large residual stresses in the samples formed by both technologies. Cause cracking and warping of the sample; in laser additive manufacturing technology, the high cooling rate and uneven temperature field distribution lead to large residual stress in the part. [0003] Patent CN201711275078.4 reports an electromagnetic induction heating 3D printing forming system. Coi...

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Problems solved by technology

[0002] At present, laser additive manufacturing technology is mainly divided into two mainstream technologies: selective laser melting based on powder spreading and direct laser melting deposition based on powder feeding. However, there are large residual stresses in the samples formed by both technologies. Causes cracking and warping of the sample; in laser additive manufacturing technology, high cooling rate and uneven temperature field distribution lead to large residual stress in the part

[0003] Patent CN201711275078.4 reports an electromagnetic induction heating 3D printing forming system. Coils of various shapes are placed under the substrate to preheat the substrate, which improves the preheating temperature and preheating efficiency, but only for laser selective melting The substrate preheating of the forming technology, as the forming platform descends, the heating effect is poor due to the distance between the plane and the coil, the temperature gradient is large, and the uniformity of the temperature field distribution becomes poor

[0004] Patent CN201610284077.5 reports a laser selective melting electromagnetic induction three-dimensional heating system. A graphite block is arranged between the induction coil and the forming chamber. The induction coil heats the graphite block. The graphite block conducts high temperature to the forming chamber, which can realize surface

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