Application of laser honing technology to cylinder sleeve of motorcycle

Abstract

The invention provides application of a laser honing technology to a cylinder sleeve. Laser and a honing technology are combined, the deformation of laser processing is 1/20-1/30 of that of the conventional heat treatment, the deformation is very small, the original state of the cylinder sleeve before the laser processing is basically kept, and the cylinder sleeve has good sealing and pairing properties with a piston and a piston ring; metal is heated through laser radiation at a rate of (3-5)*103DEG C/S, the heating rate is improved by tens of times than that of the conventional heating method, the heated cylinder sleeve is cooled by means of self heat conductivity, and the cooling rate is 900DEG C/S and is higher than that of the conventional quenching medium, so that a structure subjected to laser quenching is different from that subjected to the conventional quenching, the temperature of the structure subjected to laser quenching is decreased progressively from the surface to the core, and an ideal structure state is obtained; the maximum hardness number of the laser quenching is HRC66 which is higher than the hardness number of HRC54 of the conventional quenching, and the depth of a quenching layer is 3-3.5 millimeters, so that the inner surface of the cylinder sleeve meets the requirement of high wear resistance; the laser quenching comprises helix laser quenching and network laser quenching; and the width of a hardened zone is greater than that of a softened zone, and the width of the hardened zone is 2-2.5 millimeters generally.

Description

Technical field [0001] The invention relates to the application of laser honing technology to cylinder liners. Specifically, it relates to the application of laser honing technology in motorcycle cylinder liners to meet the requirements of high wear resistance and long life. Background technique [0002] At present, the inner surface of the cylinder liner of motorcycle engine generally adopts smooth surface or platform reticulation. From the point of view of tribology, the general method of the platform reticulation of the inner surface of the engine cylinder liner inevitably has unevenness, which cannot reach the lubricating oil. The surface of the cylinder liner is evenly arranged, so the disadvantages of early wear and short service life occur. So far, the possibility of improving the surface profile shape and further shrinking tolerances has reached its limit. For a long time, people in tribology have been yearning to have a predetermined width, depth and spacing of honing ...

AI Technical Summary

Problems solved by technology

[0002] At present, the inner surface of the motorcycle engine cylinder liner generally adopts smooth surface or flat texture. From the perspective of tribology, the flat texture method of the inner surface of the general engine cylinder liner must have inhomogeneity, which cannot achieve the lubricating oil. The surface of the cylinder liner is evenly arranged, so there are unfavorable conditions of early wear and short service life

Possibilities for improving surface profile shapes and for further shrinking tolerances have so far been limited