A high-speed laser defocus quenching strengthening method for micro razors

Abstract

The invention discloses a high-speed laser out-of-focus quenching strengthening method for micro shaving tools. Laser light spots are enlarged to widths of blades by using the scattering characteristics of laser after the laser is out of focus; proper focal distances of field lenses are selected according to quenching depths needed by the blades; and laser is output according to paths by using high-speed galvanometers for finishing quenching of workpieces at a time. The method has the characteristics of being free of repeated focusing, high in quenching speed, good in strengthening effect, considerable in performance and economical benefit and the like.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a high-speed laser defocus quenching strengthening method for a micro shaver. Background technique [0002] Shavers represented by brands such as Philips and Flyco widely use rotary micro-shavers as the core components of their cutter heads. The cutters are small in size and have complex geometric shapes. The processing method is usually stamping and forming of thin plate molds. In order to ensure the machinability of stamping forming, the tool is often processed with tempered martensitic stainless steel strip as raw material. Due to the long-term frictional contact between the blade and the knife net during use, and the tempered stainless steel material has low hardness and is prone to wear and tear, it is necessary to perform subsequent quenching and strengthening treatment on the formed tool in actual use. [0003] Laser quenching is a strengthening process that has devel...

AI Technical Summary

Problems solved by technology

Although the existing laser quenching process has the above-mentioned advantages, there are still many deficiencies in processing micro-shavers with complex shapes, small sizes, and thin thicknesses. The three-dimensional inclination angle structure, in order to ensure the effective edge quenching depth of the blade needs to reach more than 2mm, the existing laser focus quenching process needs to repeat multiple scanning and multiple focusing to complete the quenching of the blade; 2. Due to the small size of the tool and the relatively large material Thin, the repeated scanning steps of the existing laser quenching process will cause serious heat accumulation effect, resulting in poor process consistency, self-cooling and quenching effect phase is not obvious, and the phase change strengthening effect is not obvious; 3. Due to the low unit value of the micro razor , the cost of the existing laser quenching process is relatively high, so it cannot be promoted in the market

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