Laser shock and supersonic vibration extrusion co-strengthening device and method

Abstract

The invention provides a laser shock and supersonic vibration extrusion co-strengthening device and method. The device comprises a laser assembly, a vibration assembly, a hydraulic assembly and a connecting assembly. The method comprises steps as follows: a hole formed on sheet metal is strengthened while laser shock strengthening and supersonic vibration extrusion strengthening are adopted, a mandrel forms clearance fit with the hole to constrain the hole, so that distortion of hole and a hole angle when the laser shock is performed on the outer surface of a workpiece is prevented, and the strengthening effect of the hole wall is improved; when the laser shock is performed on the outer surface of the sheet metal, supersonic vibration is applied to the mandrel in the hole, three-dimensional pressure stress distribution is formed nearby the hole wall at certain depth under the interaction produced by laser shock waves and power ultrasound at certain frequency, amplitude and modal, and higher anti-fatigue performance and smoother inner surface of the hole are obtained. With the adoption of the device and the method, defects of a traditional strengthening technology are overcome, and the problem that the hole is strengthened through either single laser shock or single supersonic vibration extrusion is solved.

Description

technical field [0001] The invention belongs to the field of component surface strengthening, and provides a laser shock and ultrasonic vibration extrusion synergistic strengthening device and method, which are mainly used in the strengthening of holes with severe stress concentration in industries such as aviation, aerospace, trains and ships. Background technique [0002] In aerospace and other fields, due to reasons such as design, manufacturing and assembly, parts will inevitably have a hole structure. If the hole is not strengthened, the unreinforced hole will become one of the dangers of fatigue damage to the stress-bearing parts of the entire part. , resulting in reduced safety performance and service life. The currently widely used strengthening methods are cold extrusion strengthening and laser shock strengthening. [0003] The direct cold extrusion technology of the mandrel is to force the mandrel to pass through a hole slightly smaller than the diameter of the ma...

AI Technical Summary

Problems solved by technology

It overcomes the defects of the traditional strengthening process and solves the shortcomings of single laser shock and single ultrasonic vibration extrusion to strengthen the hole. Through the synergistic strengthening of laser shock and ultrasonic vibration extrusion, the small hole can be comprehensively strengthened

It solves the deficiency of ultrasonic vibration extrusion strengthening for hole corner strengthening, solves the problem of tensile stress in the middle of the hole wall and the limitation of hole size during laser shock strengthening, and solves the problem that the effect of laser shock strengthening on materials with large thickness is not obvious.

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