In gearboxes, microscopic fatigue cracks are often caused by excessive load during operation, excessively high rotational speed, poor lubrication, or alternating stress on the working surface. The crack has the characteristics of being difficult to find, easy to expand, and strong damage. It is one of the three major failures of the rotating machinery. According to the statistics, the large rotating mechanical structure of 80 is invalid due to cracks.
For the micro-cracking Zibo electric drum in gears and bearings in the gearbox, two kinds of materials, explant type and intrinsic self-repairing material, can be used to achieve self-healing of cracks.
The intrinsic type self-repair is to heat the crack occurrence position of the gear and the bearing, so that the atomic diffusion activation energy inside the crack increases, and the reversible reaction ability of the macromolecule is combined with the broken chain, and the welding crack is realized by a mechanism similar to the diffusion welding. Self-repair.
External self-healing technology arranges fiber ducts or microcapsules in the parts of the gearbox where cracks are likely to occur. When the base material is cracked under the action of the outside, the fiber duct or microcapsule of the crack front of the gear or bearing is stressed. When the rupture occurs, the adhesive is mixed with the curing agent under capillary action, and the crack surface is bonded by the curing reaction, thereby preventing the crack from further expanding and realizing the crack self-healing.
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