Device and method for on-line detection and elimination of material defects of molten channel in laser metal forming

Abstract

The invention discloses an on-line detection and elimination device and method for material defects of a melting channel in laser metal forming, and the device and method are suitable for laser metal deposition forming technology. The device includes four fiber-optic two-color thermometers, and the four temperature measuring probes are respectively fixed on the left, right, front and rear of the coaxial powder feeding nozzle of the forming system; the detection aiming points of the four temperature measuring probes are respectively aligned with the forming The left, right, front and back of the laser spot are formed and scanned on the plane, and at a certain distance from the center of the laser spot, the four temperature measuring probes move together with the coaxial powder feeding nozzle and the laser beam; during forming, when the coaxial feeding When the powder nozzle and the laser beam are scanned in any direction of X, X, Y, Y, the temperature measuring probe located on the opposite side of the coaxial powder feeding nozzle scans the position at a certain distance from the laser spot on the high temperature melting channel. When the temperature changes abruptly, it is determined that there is a material defect at the location, the location of the defect is determined, and laser targeted remelting is performed on the defect.

Description

technical field [0001] The invention belongs to the technical field of laser metal additive manufacturing, and in particular relates to an online detection device for material defects of a melting channel in laser metal forming, and also relates to a method for using the device to realize online detection and elimination of material defects in a melting channel in laser metal forming. And the method is applicable to the laser metal deposition shaping process. Background technique [0002] Laser Metal Deposition Forming (LMDF) is commonly known as laser metal 3D printing. This technology can realize the direct near-net shape of complex metal parts by means of layer-by-layer laser melting deposition of metal materials according to the computer three-dimensional model without any mold and tooling, and has the advantages of short manufacturing cycle and small processing allowance. The unique advantages of high material utilization rate and high process flexibility provide a new...

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Problems solved by technology

[0004] Another object of the present invention is to provide an online detection and elimination method for the material defects of the molten channel in laser metal forming by using the above-mentioned device, without suspending the forming production due to detection, without affecting the forming efficiency, and solving the problem that the existing technology cannot solve the small material defects. Problems performing online detection and targeted elimination in melt channel forming scans

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