A kind of coaxial powder feeding laser cladding method under vacuum condition and its special processing device
A technology of coaxial powder feeding and laser cladding, which is applied in the field of laser processing, can solve problems affecting processing effects, etc., and achieve the effect of improving effective utilization, improving uniformity, and continuous powder feeding
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Embodiment 1
[0035] (1), using an organic solvent to clean the surface of the nickel-based superalloy substrate;
[0036] (2), put the base material on the workbench 3, and use the vacuum unit 5 to vacuumize the vacuum chamber 2, so that the pressure in the vacuum chamber 2 reaches 1Pa;
[0037] (3), start the laser, the laser power is 500-800W, the laser focus diameter is 1.0mm, and the scanning speed is 800-1200mm / min; the laser beam is irradiated on the surface of the substrate at the designated position through the light guide device 1 to melt the surface of the substrate, Form a molten pool on the surface of the substrate;
[0038] (4) The automatic powder feeder 4 feeds the nickel-based superalloy powder from the coaxial powder feeding nozzle 41 into the molten pool on the base material under positive pressure conditions, melts the metal powder after being focused by the laser head, and sends the powder coaxially The powder nozzle 41 is kept coaxial with the laser beam, the convergi...
Embodiment 2
[0042] The difference from Example 1 is that the base material used is titanium alloy, and the metal powder is titanium alloy powder. In the range of laser power 850-1000W, the laser focus diameter is 1.0mm; the increase of power density reduces the scanning speed to 600-800mm / min, cooling rate is 10 3 K / s will increase the coating layer depth, hardness and surface roughness of the hardened layer of the substrate.
[0043] It is difficult to avoid the oxidation problem of the above-mentioned coatings by blowing Ar gas in the air, and the oxidation layer is clearly visible to the naked eye; the coatings produced in the vacuum system are smooth and clean, and there is no oxidation phenomenon after testing.
Embodiment 3
[0045] The difference from Example 1 is: in the range of laser power 1050-1200W, the laser focus diameter is 1.0mm; the increase of power density and the reduction of scanning speed to 350-550mm / min will make the coating layer of the substrate The depth, hardness and surface roughness of the hardened layer increase. If the power is too high and the scanning speed is too slow, that is, the specific power is too high, beyond the above range, it will cause the surface of the workpiece to melt and burn; otherwise, the depth of the coating layer will not meet the technical requirements.
[0046] It is difficult to avoid the oxidation problem of the above-mentioned coatings by blowing Ar gas in the air, and the oxidation layer is clearly visible to the naked eye; the coatings produced in the vacuum system are smooth and clean, and there is no oxidation phenomenon after testing.
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