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 The area is uniformly heated, which reduces the temperature gradient between the processing layers and the cooling and solidification rate, and reduces the residual stress in the metal parts; but the induction heating of a specific area cannot be realized, and the heat-affected zone is large

[0005] Patent CN201611222037.4 reports a thermal, acoustic and magnetic composite energy field-assisted laser cladding method for metal-based ceramic coatings, which heats the surface of the sample based on electromagnetic induction, but it is difficult to achieve synchronous preheating and slow cooling, and follow the laser Synchronous movement of head variable scanning path

[0006] Zhang Anfeng of Xi'an Jiaotong University published "Induction Heating Eliminates Cracks in Laser Directly Formed DD4 Parts". After adding induction heating, the temperature gradient and solidification speed are significantly reduced, resulting in a significant reduction in the thermal stress of the cladding layer. At the same time, the reduction in solidification speed will make The stress of the cladding layer is released, and the liquid flow in the molten pool is more sufficient, thereby reducing the possibility of solidification cracks, and the cladding cracks of DD4 parts are basically eliminated at 1200 ° C; but the device is not suitable for induction heating assisted laser direct forming larger size parts

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