A flexible variable absorbing layer of thickness and its preparation and use method

Abstract

The invention relates to a laser surface shock strengthening method, and in particular to an absorbing layer with flexibly variable thickness and an application method thereof. The absorbing layer with the flexibly variable thickness is applied to the laser shock strengthening of a small-pitch gear surface. The method is characterized in that three thick liquids which are prepared through different materials and are fixed in thickness are horizontally paved layer by layer in a special die and then properly heated to form a semi-solid absorbing layer with the flexibly variable thickness; then the semi-solid absorbing layer with the flexibly variable thickness is adhered to the tooth surfaces of a gear, and clearances among teeth are fully filled with a flexible part of the semi-solid absorbing layer; a smooth column surface can be formed on the outer wall of the absorbing layer; the absorbing layer is heated to be completely solidified; and finally a large-size overlapping laser shock method is carried out to uniformly strengthen the gear. The method has the advantages the thickness of the absorbing layer is flexibly variable; the outer wall of the absorbing layer adhered to the tooth surfaces of the gear can form the smooth column surface, so that the large-area overlapping laser shock treatment can be conveniently carried out for the gear, and as a result, the surfaces of a small-pitch gear and similar workpieces can be uniformly strengthened; and the absorbing layer is easily removed after the shock treatment is finished, and the demand of mass production can be met.

Description

technical field [0001] The invention relates to laser surface impact strengthening technology, in particular to a thickness flexible variable absorbing layer for laser shock strengthening on the surface of small tooth pitch gears and its use method. The absorption layer and its use method can be extended to small tooth pitch gears. Surface strengthening of key punches and fine pitch threads. Background technique [0002] With the increasing maturity of laser technology, laser has been applied to the surface strengthening of parts. The laser shock strengthening treatment of the gear surface can not only improve the surface quality, fatigue strength and wear resistance of the gear, but also make the process simple, the deformation small, the surface roughness low and the smoothness good. Therefore, it has huge economic benefits and broad application prospects. [0003] In the early 1970s, Fairand and others in the United States first used the shock wave pressure induced by i...

AI Technical Summary

Problems solved by technology

However, for spline punches and gear parts with small tooth pitches, the diameter of the laser beam is 2-8mm. When the pitch of the spline punch or transmission gear is less than 10mm, the laser beam will Radiation to the side of the tooth, the absorption layer pasted on the side absorbs the laser energy and vaporizes to form plasma, which shields the laser beam from radiating downward to the alveolar, and the alveolar part cannot be strengthened

In addition, when a large area is impacted, the absorbent layer in the overlapping area is prone to warping and peeling off

Therefore, the overall strengthening of the surface of such workpieces cannot be achieved by using ordinary absorbing layers, which seriously weakens the performance of the workpiece surface after laser shock strengthening, and cannot achieve uniform strengthening effects.

Images