Surface strengthening treatment method for metal material through coupling electroplastic effect and ultrasonic rolling

Abstract

The invention relates to a surface strengthening treatment method for a metal material through coupling an electroplastic effect and ultrasonic rolling. The surface strengthening treatment method comprises the steps of (1) clamping a metal workpiece on a supporting device; and (2) applying a pulse current to a processing region of the metal workpiece, and properly reducing the plastic transformation resistance of the surface layer of the processing region by virtue of an electroplastic effect, a skin effect and a thermal effect of the pulse current; and meanwhile driving the metal workpiece to rotate by the supporting device, and carrying out ultrasonic impact rolling on the surface layer of the processing region by using an ultrasonic rolling device moving along the axial direction of the metal workpiece to ensure that the surface layer of the processing region generates violent plastic deformation to increase the dislocation density and refine grains to further form a strengthened layer. According to the method, the strengthening treatment on the surface of the metal material is realized by combining the electroplastic effect, ultrasonic impact and a rolling effect; and compared with a single ultrasonic rolling method, the method has the advantages that the acting thickness of the strengthened layer is further increased, and the extreme surface hardness of the workpiece is further improved. When the method is used for surface strengthening treatment on intractable metal materials with high hardness or seriously-hardened intractable metal materials, the quality of the strengthened layer can be remarkably improved, the processing efficiency can be greatly increased, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the field of metal processing, and in particular relates to a method for surface strengthening treatment of metal materials by coupling electroplasticity and ultrasonic rolling. Background technique [0002] In recent years, my country's national economy has developed rapidly, and great achievements have been made in the fields of aerospace, engineering machinery, medical equipment, ocean engineering and shipbuilding. But at the same time, these industries also put forward higher requirements for the reliability of mechanical parts in service, which requires mechanical parts to have high surface hardness, high wear resistance, high fatigue resistance, high surface finish and good durability. Corrosion and other comprehensive performance, this is the main issue facing my country's machinery manufacturing industry. [0003] Ultrasonic rolling processing is a new surface strengthening processing method for metal materials that has...

AI Technical Summary

Problems solved by technology

At this time, the hardness of the outermost layer of the strengthening layer will reach a certain limit accordingly, and cannot be further improved.

Especially for some difficult-to-machine metal materials with high hardness or severe work hardening, the surface is often in a state of high hardness and low plasticity. The surface is subjected to strong plastic deformation by simple ultrasonic rolling processing method, and then on the surface It is very difficult to obtain a surface enhancement layer with a large depth and a high surface hardness

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