Laser quenching method for rack

Abstract

The invention discloses a laser quenching method for a rack. The laser quenching method for the rack comprises the steps of simultaneously emitting a laser beam for laser scanning and quenching toothsurfaces to be quenched on two sides of any tooth on the rack; and during quenching, controlling the laser beam and the tooth surfaces to be quenched to be completely perpendicular or approximately perpendicular without interfering an adjacent tooth crest, and controlling the laser beam to irradiate the whole tooth surfaces to be quenched. According to the laser quenching method for the rack provided by the invention, a heat transfer manner with laser beam inputting can be changed, so that the problem that during one-side quenching, a tooth surface is heat, so that a quenched layer of an opposite adjacent surface is heat repetitively so as to be annealed is effectively solved, the defect that the tooth surface is easy to anneal when being quenched by adopting laser is overcome, meanwhile,the rack quenching quality can be effectively ensured, and the benefit is remarkable.

Description

technical field [0001] The invention relates to the field of surface laser heat treatment, in particular to a laser quenching method for racks. Background technique [0002] Laser quenching technology is the process of rapidly heating and cooling the metal surface when the laser is used to act on the surface of the metal workpiece. Due to the rapid temperature rise of the metal surface, the surface of the material quickly reaches the austenite temperature. After the original pearlite structure of the material is transformed into austenite structure, the austenite is transformed into martensite with the rapid cooling of the heat conduction of the material itself. organization to complete organizational transformation. [0003] Compared with the traditional heat treatment process, the development history of laser surface hardening is very short, but from the characteristics and application effect of its technology, the efficiency of laser heat treatment is very high, which is...

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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a laser quenching method for racks, so as to overcome the single-side quenching method for racks in the prior art, and the heat input by the laser beam will be conducted to the previous processing. On the good side, it causes the problem that the hardness of the previous tooth surface is reduced due to repeated heating

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