Full-automatic high-energy laser surface hardening system

Abstract

The invention discloses a full-automatic high-energy laser surface hardening system. The common high-energy laser surface hardening is an open loop process, and under the conventional equipment conditions, because of the problems of uniformity, curved surface, corner, transitional surfaces and the like of the workpiece surface material, the heating temperature is non-uniform, the hardening surface is warped, the thermal deformation is large, even the local surface is molten, and the original precision of a workpiece is damaged. The laser light wave frequency signal is measured, and the central temperature of light spots is detected, so that the workpiece surface temperature is tracked in real time, the laser output power is controlled through the automatic laser power regulation system, and the peak value of the workpiece surface temperature is controlled in a small range; moreover, an automatic laser processing system established on the surface temperature closed-loop control system comprises high-energy laser, a real-time surface temperature monitoring system, a feedback system and an automatic laser power regulation system. According to the workpiece surface hardened by the system, because the surface laser power is effectively controlled, the hardening layer is uniform, the thermal deformation is small, and the machining precision requirement is met.

Description

technical field [0001] The invention relates to a fully automatic high-energy laser surface hardening system, which belongs to the field of high-energy laser surface hardening. Background technique [0002] Laser has the characteristics of high brightness, high directionality, high monochromaticity, and high coherence, and is now being used in more and more fields. Laser hardening is one of the surface treatment technologies. Laser hardening refers to the use of laser beams to irradiate the metal surface so that the surface temperature reaches the phase transformation temperature region (higher than the austenitization temperature, lower than the melting temperature), and the surface steel material undergoes austenitization phase transformation. After the laser beam leaves the irradiation area, the heat on the surface of the material is absorbed by the internal material, the surface temperature drops rapidly, and a layer of martensitic structure is formed on the surface, tha...

AI Technical Summary

Problems solved by technology

Traditional quenching technology can generally only be used for overall or surface hardening, it is difficult to harden local surfaces, and it is even more difficult to apply local precision machining of complex geometric surfaces

Moreover, the quenching process steps are cumbersome, the quenching layer is uneven, and post-processing is required. Due to the large depth of quenching heat treatment, air cooling cannot be performed, and forced cooling of the cooling liquid is required, resulting in waste slag and waste liquid, which increases processing costs and environmental burdens.

In the traditional quenching technology, due to the uneven control of temperature, defects such as thermal cracks, bubbles, and porosity are prone to occur

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