Laser cladding device based on multi-focus lens to generate preheating and slow cooling light

Abstract

The invention discloses a laser cladding device for preheating and generating slow cooling light based on a multifocal lens. The multifocal lens is used as a cladding focusing mirror, a plurality of foci are obtained in various different positions of an optical axis, a plurality of light spots on the same optical axis are formed on the surface of a workpiece, the energy density linearly changes along with the areas of the light spots, wherein 0-order light of which the focal position is in the middle is used as laser cladding light, light of other diffraction orders is used as preheating and slow cooling light, the focus of the 0-order light is on the working surface, and the light of other orders generates the light spots which use the optical axis as the center on the working surface, so that the conditions that the irradiated area is increased and the power density is reduced are formed. Thus, the middle light spots have high power density and are used for melting the surfaces of base materials so as to form molten pools, and the surrounding light spots have low power density and are suitable for preheating and post processing. By adopting the layout, decreasing or increasing temperature is generated, so that asymptotic preheating and slow cooling treatment is further formed, the temperature gradient is reduced, and the absorptivity of the base materials to laser is increased.

Description

technical field [0001] The invention relates to the technical field of laser cladding processing, in particular to a laser cladding device for generating preheating and slow cooling light based on a multi-focus lens. Background technique [0002] In recent years, with the rapid development of industrial technology, higher requirements have been placed on the performance of parts. Laser cladding technology has obvious advantages in the preparation of high-performance material parts, and its high-efficiency, fast, and high-quality characteristics make it one of the key technologies for high-performance parts manufacturing. Compared with traditional subtractive processing, laser cladding is an additive manufacturing method and one of the main repair technologies in the field of remanufacturing. The heat input of laser cladding is very small, so the deformation of the substrate is small. The dilution rate of the laser cladding layer is small and controllable, and the metallurgi...

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Problems solved by technology

However, in the actual processing process, the crack shape of the part is complex and the length is very short. The laser beam trajectory must match the crack shape at all times. This method has the disadvantage of low practicability.

The application number is 'CN201610144326.0', a method of segmented laser cladding remanufacturing of complex parts with preheating and heat treatment, which adopts one laser segmental processing, and performs preheating processing and slow cooling process respectively. The processing process is complicated and the processing low efficiency

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