A device for heating to create a uniform molten pool

Abstract

The invention discloses a device for heating and generating a uniform molten pool, which includes: a source unit for generating an energy beam; a beam shrinking and expanding unit located in the energy path of the energy beam to adjust the diameter of the energy beam; and a beam expansion unit located in the energy path A flat-top conical lens group, and the beam shrinking and expanding unit is located between the source unit that generates the energy beam and the flat-top conic lens group, and the flat-top conic lens group includes at least two flat-top conical lenses; and The focusing lens is located in the energy path of the energy beam, and the flat top conical lens group is located between the beam shrinking and expanding unit and the focusing lens, and the focusing lens focuses the energy beam. The invention can generate a uniform melting pool, so as to avoid gasification and splashing caused by overheating when the material is melted.

Description

technical field [0001] The invention relates to a device for heating and generating a uniform melting pool, in particular to a device for converting a Gaussian beam into a combination of a weakened Gaussian beam and an annular beam. Background technique [0002] Although the existing laser powder-feeding cladding manufacturing technology (applicable to 3D printing) or welding can melt and solidify materials quickly and effectively by using Gaussian or flat-hat beams to melt and solidify materials, due to the energy concentration at the center of the Gaussian spot, It will lead to excessively high temperature and cause the material to boil and vaporize, so that when the vaporized molecules leave the surface, it will cause recoil pressure and push the molten pool, so it often causes defects such as material splashing and surface depression. Moreover, due to the high energy of the central point of the Gaussian beam, the formed weld bead will be approximately elliptical, so the ...

AI Technical Summary

Problems solved by technology

[0002] Although the existing laser powder-feeding cladding manufacturing technology (applicable to 3D printing) or welding can melt and solidify materials quickly and effectively by using Gaussian or flat-hat beams to melt and solidify materials, due to the energy concentration at the center of the Gaussian spot, It will lead to excessively high temperature and cause the material to boil and vaporize, so that when the vaporized molecules leave the surface, it will cause recoil pressure and push the molten pool, so it often causes the defects of material splashing and surface depression

Moreover, due to the high energy of the central point of the Gaussian beam, the formed weld bead will be approximately elliptical, so the overlap rate of the melting zone or weld bead in the laser powder-feeding cladding production process is relatively high, even as high as 50%, so the production process generates Relatively low rate

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