POWDER SUPPLY NOZZLE AND OVERLAYING METHOD
First Claim
Patent Images
1. A powder supply nozzle comprising:
- a laser emission part which has a tubular innermost nozzle having a center axis coincident with a laser optic axis and connected to a laser beam condensing part and a gas supply source, the laser emission part radiating a laser beam while blowing off an inert gas, the radiating and blowing-off being performed from a tip of the innermost nozzle onto a workpiece; and
a powder supply part which has a tubular inner nozzle disposed in the periphery of the laser emission part and having a center axis coincident with the laser optic axis, the inner nozzle connected to a powder supply source, the space defined by the inner nozzle and the laser emission part being used as a powder passage, the powder supply part discharging a powder together with a carrier gas from the inner nozzle to a laser-irradiated part, wherein;
the powder supply nozzle includes a tubular outer nozzle disposed in the periphery of the powder supply part and having a center axis coincident with the laser optic axis;
the outer nozzle is connected to the gas supply source;
the space defined by the inner nozzle and the outer nozzle is used as a gas supply passage; and
a blow-off angle at a tip of the outer nozzle is within the range from 0°
, exclusive, to 60°
, inclusive, in a direction for spreading toward the outside of the nozzle relative to the laser optic axis.
1 Assignment
0 Petitions
Accused Products
Abstract
An object of the present invention is to provide a powder supply nozzle and an overlaying method which make it possible to restrain oxidation of a clad layer part and to produce a clad layer part with high quality. The invention provides a powder supply nozzle including: a laser emission part for irradiating a workpiece with a laser beam; and a powder supply part disposed in the periphery of the laser emission part and adapted to discharge a powder onto a laser-irradiated part, wherein a mechanism for guiding the air surrounding the laser-irradiated part to the exterior of the laser-irradiated part is provided in the periphery of the powder supply part.
18 Citations
16 Claims
-
1. A powder supply nozzle comprising:
-
a laser emission part which has a tubular innermost nozzle having a center axis coincident with a laser optic axis and connected to a laser beam condensing part and a gas supply source, the laser emission part radiating a laser beam while blowing off an inert gas, the radiating and blowing-off being performed from a tip of the innermost nozzle onto a workpiece; and a powder supply part which has a tubular inner nozzle disposed in the periphery of the laser emission part and having a center axis coincident with the laser optic axis, the inner nozzle connected to a powder supply source, the space defined by the inner nozzle and the laser emission part being used as a powder passage, the powder supply part discharging a powder together with a carrier gas from the inner nozzle to a laser-irradiated part, wherein; the powder supply nozzle includes a tubular outer nozzle disposed in the periphery of the powder supply part and having a center axis coincident with the laser optic axis; the outer nozzle is connected to the gas supply source; the space defined by the inner nozzle and the outer nozzle is used as a gas supply passage; and a blow-off angle at a tip of the outer nozzle is within the range from 0°
, exclusive, to 60°
, inclusive, in a direction for spreading toward the outside of the nozzle relative to the laser optic axis. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An overlaying method comprising:
-
irradiating a workpiece with a laser beam while blowing an inert gas from a laser emission part onto the workpiece so as to supply a laser-irradiated part with a powder together with a carrier gas from a powder supply part comprised of the laser emission part and an inner nozzle provided in the periphery of the laser emission part and thereby to form a clad layer part, wherein; a guide gas is blown off from an outer nozzle, which is disposed in the periphery of the powder supply part and connected to the gas supply source, at an angle within the range from 0°
, exclusive, to 60°
, inclusive, in a direction for spreading toward the outer side outside of the nozzle relative to a blow-off direction of the inert gas the laser optic axis. - View Dependent Claims (9, 10, 11, 12)
-
-
13. An overlaying method comprising:
-
irradiating a workpiece with a laser beam from a laser emission part while blowing an inert gas from a laser emission part onto the workpiece, so as to supply a laser-irradiated part with a powder together with a carrier gas from a powder supply part comprised of the laser emission part and an inner nozzle provided in the periphery of the laser emission part and thereby to form a clad layer part, wherein; the air surrounding the inert gas is sucked through an outer nozzle disposed in the periphery of the powder supply part and connected to suction equipment; an outermost nozzle connected to a gas supply source is disposed in the periphery of the outer nozzle; and a guide gas is blown off from the outermost nozzle at an angle within the range from 0°
, exclusive, to 60°
, inclusive, in a direction for spreading toward the outside of the nozzle relative to the laser optic axis and at a flow velocity greater than the flow velocity of the powder supplied from the powder supply part. - View Dependent Claims (14, 15)
-
-
16-21. -21. (canceled)
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeHitachi, Ltd.
-
Original AssigneeHitachi, Ltd.
-
InventorsTsukamoto, Takeshi, Okamoto, Kenichi, Miyagi, Masanori, Kawanaka, Hirotugu
-
Application NumberUS14/239,979Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current427/554CPC Class CodesB05B 1/24 incorporating means for hea...B23K 26/144 the fluid stream containing...B23K 26/342 Build-up weldingC23C 4/123 Spraying molten metal
