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

A metal forming and detection device technology, applied in the direction of measuring devices, optical testing flaws/defects, additive processing, etc., can solve the problems of targeted elimination, inability to scan online detection of small material defects, melt channel forming, etc., and achieve easy implementation, The effect of eliminating internal material defects and reducing the risk of fatigue fracture

Inactive Publication Date: 2017-08-22
XIAN UNIV OF TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment

[0036] A TA15 titanium alloy cuboid part with a length, width and height of 150×50×60 mm is fabricated by laser deposition forming, and the titanium alloy part 8 is located above the substrate 9 and the workbench 10 . The (x, y) coordinate orientation of the lower left corner of part 8 in the forming plane is (0mm, 0mm). The forming process parameters adopted are: laser power 300W, scanning speed V 10mm / s, powder feeding rate 4.9g / min, laser spot diameter d 0.5mm, layer thickness 0.1mm, overlapping rate 40%, scanning method For reciprocating scanning. When making the part, the device and method of the present invention are used to realize the online detection and elimination of material defects of the melting channel in laser deposition forming.

[0037] The fiber-optic two-color thermometer 2 used in this example has a response time of 2ms, the temperature probe 5 can withstand a high temperature of 250°C, the temperature measurement range is 350-1300°C, the temperature meas...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/00G01N21/95G01K11/32B33Y10/00B33Y30/00B33Y50/02
CPCG01K11/32G01N21/95B22F3/00B33Y10/00B33Y30/00B33Y50/02G01N2201/08
Inventor 解瑞东李涤尘张安峰
Owner XIAN UNIV OF TECH
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