Device for heating to generate uniform motlen pool

Abstract

This disclosure provides a device for heating to generate a uniform molten pool, including: a source unit for generating an energy beam; a beam expanding/reducing unit positioned in an energy path of the energy beam for adjusting the diameter of the energy beam; a flat-top conical lens set positioned in the energy path and including at least two flat-top axicons, with the beam expanding/reducing unit positioned between the source unit and the flat-top conical lens set; and a focusing lens positioned in the energy path, with the flat-top conical lens set between the beam expanding/reducing unit and the focusing lens, and the energy beam being focused by the focusing lens. This disclosure generates a uniform molten pool to prevent vaporization splash due to overheating of the material during melting.

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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