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Laser cladding head capable of conducting preheating and tempering simultaneously and laser cladding method thereof

A technology of laser cladding and laser head, applied in metal material coating process, coating, etc., can solve the problem of excessive stress of cladding layer, large residual stress of cladding layer, workpiece preheating treatment, cladding process and cladding Layer tempering treatment can not be carried out simultaneously to achieve the effect of reducing residual stress, crack sensitivity and structure composition inhomogeneity

Inactive Publication Date: 2020-04-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the laser cladding process, due to the excessive temperature gradient generated by rapid heating and rapid cooling, there is a large residual stress in the cladding layer, which has high crack sensitivity and structural inhomogeneity
[0004] Chinese patent 201710239927.4 discloses a multi-angle preheating and tempering laser cladding head. Compared with the cladding laser head, the tempering laser head and preheating laser head of the cladding head adopt an outward expansion structure, that is, from The light output from the tempering laser head, preheating laser head, and cladding laser head cannot converge to the same processing part of the workpiece, that is, the preheating treatment, cladding processing, and cladding layer tempering treatment of the workpiece cannot be carried out simultaneously, so The resulting processed layer structure is not as uniform as expected
[0005] Chinese patent 201820772393.1 discloses a cladding head with a variable spot. In this device, the shape of the laser spot is changed by changing the lens disc, and the surface of the workpiece cannot be preheated and tempered. There is a problem of cladding caused by rapid heating and cooling of a single laser. Excessive stress and tissue inhomogeneity of the layer; the device is also unable to change the power of the processing laser by switching the lens disc

Method used

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  • Laser cladding head capable of conducting preheating and tempering simultaneously and laser cladding method thereof
  • Laser cladding head capable of conducting preheating and tempering simultaneously and laser cladding method thereof

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Embodiment 2

[0073] A preheating beam splitter with a transmission and reflectance ratio of 95 / 5 and a preheating beam splitter with a transmission and reflectance ratio of 90 / 10 are arranged on the preheating mirror turntable; set on the processing mirror turntable There is a processed beam splitter with a transmission and reflectance ratio of 10 / 90, and a processed beam splitter mirror with a transmission and reflectance ratio of 15 / 85; a tempered mirror with a reflectance of 90% and A tempered mirror with 95% reflectivity. Select combination: preheated beam splitter with transmission and reflection ratio of 95 / 10, processed beam splitter with transmission and reflection ratio of 10 / 90, tempered mirror with reflection rate of 95%; then 10% of the high-energy laser energy will be For preheating the workpiece, 81% of the high-energy laser energy is used for processing, and 8.55% of the high-energy laser energy will be used for tempering the cladding layer.

Embodiment 3

[0075] A fully transmissive preheating beam splitter, a preheating beam splitter with a transmission and reflectance ratio of 90 / 10 is arranged on the preheating mirror turret; a transmission and reflectance ratio is set on the processing mirror turret A 10 / 90 processed beam splitter, a processed beam splitter of a total reflection mirror; a tempered mirror with total reflection and a tempered mirror with a reflectivity of 95% are arranged on the tempered mirror turntable. Select combination: preheated beam splitter with transmission and reflection ratio of 95 / 10, processed beam splitter with transmission and reflection ratio of 10 / 90, tempered mirror with reflection rate of 95%; then 10% of the high-energy laser energy will be It is used to preheat the workpiece, 81% of the high-energy laser energy is used for processing, and 8.55% of the high-energy laser energy will be used for tempering the cladding layer. Optional combination: full transmission preheating beam splitter, p...

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Abstract

The invention discloses a laser cladding head capable of conducting preheating and tempering simultaneously and a laser cladding method thereof. The laser cladding head comprises a shell and a laser head. The shell is internally provided with a preheating beam splitter, processing beam splitters and tempering reflecting mirrors. The laser cladding head can adopt the same incident laser beam, conducts beam splitting treatment through the preheating beam splitter, the processing beam splitters and the tempering reflecting mirrors to obtain respective reflecting laser beams, and the reflecting laser beams can all be focused on parts to be machined of workpieces to form processing layers on the surfaces of the workpieces, and preheating-cladding processing-tempering treatment can be carried out at each moment in the thickness increasing direction according to the time course. Thus, high residual stress caused by rapid heating and rapid cooling during traditional laser processing can be substantially reduced, and the crack sensitivity of cladding layers and nonuniformity of structure components can be reduced.

Description

technical field [0001] The invention belongs to a supporting device of laser processing equipment, and relates to a laser cladding head, in particular to a laser cladding head capable of simultaneous preheating and tempering and a laser cladding method thereof. Background technique [0002] Laser cladding refers to the addition of cladding materials on the surface of the substrate, and the use of high-energy laser beams to simultaneously melt the cladding materials and the substrate to form a metallurgical bonding cladding layer. Laser cladding can significantly improve the wear resistance, corrosion resistance, heat resistance, oxidation resistance and other properties of the substrate surface. [0003] During the laser cladding process, due to the excessive temperature gradient generated by rapid heating and rapid cooling, there is a large residual stress in the cladding layer, which has high crack sensitivity and structural inhomogeneity. [0004] Chinese patent 20171023...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 倪中华孙桂芳陈明智卢轶王占栋
Owner SOUTHEAST UNIV