Processing device for achieving workpiece surface nanocrystallization and processing method for crankshaft device surface gradient nanocrystallization

Abstract

The invention discloses a processing device for achieving workpiece surface nanocrystallization and a processing method for crankshaft device surface gradient nanocrystallization, and belongs to the technical field of metal material surface strengthening. The processing device comprises a knife handle, a rotatable supporting knife rest, a surface nanocrystallization processing knife head and a spherical processing ball. The rotatable supporting knife rest is arranged at the processing end of the knife handle and can rotate. The nanocrystallization processing knife head is fixed to the rotatable supporting knife rest. The spherical processing ball is arranged on the nanocrystallization processing knife head and can freely roll. The spherical processing ball does not need to be held by an extra protection cover, and therefore interference of a processing system and a crankshaft device is avoided. Through optimization of surface nanocrystallization process parameters, a surface nano tissue structure layer can be obtained on the crankshaft surface.

Description

technical field [0001] The invention relates to the technical field of surface strengthening of metal materials, in particular to a processing device and method for realizing surface nanometerization, and in particular to a processing device for realizing surface nanometerization of workpieces and a processing method for gradient nanometerization of crankshaft device surfaces. Background technique [0002] When the engine is working, the crank bearing is subject to large alternating bending stress and torsional stress, and the stress distribution is extremely uneven, which is prone to fatigue cracks and fatigue fractures. The stress concentration is the most serious at the transition fillet of the connecting rod journal of the crankshaft and the crank, and they are often the source of fatigue cracks. The current methods to improve the performance of the crankshaft mainly adopt nitriding, intermediate frequency quenching and fillet rolling technology. However, nitriding, as ...

AI Technical Summary

Problems solved by technology

[0004] However, for the special structure and size of crankshaft solid components and other industrial processing components, especially the crankshaft components have complex curved surface structures such as the rounded corners of the connecting rod shaft, the rounded corners of the main shaft, and the facade of the crank arm, and the operable space is limited. There are great limitations when surface nanosizing

The existing processing technology such as fillet rolling technology uses the roller follow-up type of the rolling head to roll the fillet, and the residual compressive stress layer is preset, but the effect of surface nanometerization cannot be achieved, and the surface gradient nanometer cannot be produced. structural layer

However, the structure of the conventional processing system for realizing nanometerization of the surface of simple round rod materials is relatively simple (such as patent ZL201510776845.4). Interference occurs, and the surface nano-processing of crankshaft components, especially fillets and crank arm elevations, cannot be realized

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