Quenching strengthening process of thin blade cutting edge

Abstract

The invention discloses a quenching strengthening process of a thin blade cutting edge. The process is characterized in that after a thin blade is integrally quenched by a traditional quenching process, the integrally-quenched thin blade is subjected to rough sharpening; the roughly-sharpened thin blade is moved at a high speed, the relative moving speed is 100-400 mm / s, when the thin blade moves,a high-power-density laser light spot is adopted to irradiate the cutting edge, the power density is larger than or equal to 150 W / mm<2>, the cutting edge forms a laser quenching layer, and finally fine sharpening is carried out, so that the thin blade with the quenched-strengthened cutting edge is obtained. A high-power-density laser device is matched with the fast-moving thin blade, so that thecutting edge of the thin blade is protected from being melted, the quenching effect is achieved, the sharpness, the wear resistance and the service life of the thin blade are improved, and the best performance of the material of the thin blade is played.

Description

technical field [0001] The invention relates to a process for strengthening and quenching the edge of a thin blade, which belongs to the field of heat treatment. Background technique [0002] Thin blades are made of high carbon tool steel, such as common utility knives, pedicure knives, die cutters, etc. At present, such thin blades are heat-treated by traditional processes such as high-frequency quenching or mesh belt furnace quenching in China, and then ground. For such thin blades, the overall quenching has the following problems: 1. The blade will be Overall hardening, the overall hardened blade is prone to breakage or snapping during use, which may endanger the personal safety of the user; 2. In order to prevent the phenomenon of breaking or snapping, it is often tempered Reduce the hardness of the product, resulting in a reduction in the sharpness and wear resistance of the product, and shorten the service life of the product. 3. The thin blade using the traditional ...

AI Technical Summary

Problems solved by technology

At present, such thin blades are heat-treated by traditional processes such as high-frequency quenching or mesh belt furnace quenching in China, and then ground. For such thin blades, the overall quenching has the following problems: 1. The blade will be Overall hardening, the overall hardened blade is prone to breakage or snapping during use, which may endanger the personal safety of the user; 2. In order to prevent the phenomenon of breaking or snapping, it is often tempered Reduce the hardness of the product, resulting in a reduction in the sharpness and wear resistance of the product, and shorten the service life of the product

3. The thin blade using the traditional quenching process is ground and sharpened after the overall quenching. Even if the high temperature generated during grinding is synchronously cooled by the coolant, it will still cause tempering of the cutting edge and reduce the hardness of the cutting edge. It also reduces the sharpness and wear resistance of the product and shortens the service life of the product

The technical solution is to laser harden the part within 2mm of the blade. In practical application, because the material is very thin, the material is easy to warp and deform after continuous laser quenching. In order to control the deformation, pulse laser is generally used for intermittent quenching. Pulse laser quenching is used. Since the light output is discontinuous, in order to ensure a continuous quenching layer on the cutting edge, the spot must reach a certain overlap rate by reducing the quenching speed, and the quenching efficiency is very low. For example, if the overlap rate is 50%, the maximum quenching speed is only 25mm / s, which cannot meet the minimum 100mm / s high-speed production requirements of the blade assembly line, and has no practical application value for low-priced, low-value-added products such as thin blades

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