A device and method for laser shot peening composite rolling strengthening of a rotary body

Abstract

The invention provides a laser shot blast-rolling reinforcement compound device of a rotary body and a method thereof. The laser shot blast-rolling reinforcement compound device comprises a laser emitting device, a light path conveying device, a numerical control platform and a rolling head; the laser emitting device is used for generating laser beams; one end of the light path conveying device isused for inputting the laser beams, the other end of the light path conveying device is provided with the rolling head, and the rolling head is in contact with the rotary body and used for carrying out rolling reinforcement on the surface of the rotary body while the laser beams are enabled to penetrate through the rolling head so as to perform laser shot blast on the surface of the rotary body;the rotary body is fixed by the numerical control platform through a first rotating device; and the numerical control platform is used for fixing the light path conveying device through a second rotating device, which is used for enabling the rolling head to rotate around the rotary body. According to the laser shot blast-rolling reinforcement compound device of the rotary body and the method thereof, a pressure spring in the rolling head is adjusted to obtain the required rolling load, a laser is guided through the light path system, automatic focusing of the laser shot blast process is realized, and compound surface reinforcement of a complex curved surface can be accurately realized.

Description

technical field [0001] The invention relates to the technical field of surface deformation strengthening, in particular to a device and method for laser shot-peening composite rolling strengthening of a revolving body. Background technique [0002] Ball valve, the valve whose starting part (ball) is driven by the valve stem and rotates around the axis of the ball valve can also be used for fluid regulation and control. The structure of the ball valve is required to be compact, open and close quickly, and seal reliably, and the ball is a key part of the ball valve, and its surface quality directly affects the sealing performance of the valve. When processing the valve ball, in addition to improving the roundness of the ball and reducing the surface roughness, increasing the surface hardness of the ball and the residual compressive stress on the surface can enhance the wear resistance and corrosion resistance of the ball, thereby improving the service life and reliability of t...

AI Technical Summary

Problems solved by technology

Among them, hard chromium plating on the surface of the sphere has good wear resistance and corrosion resistance, and the process is simple and the cost is low, but the bonding strength between the chrome plating layer and the substrate is poor, and the coating is easy to peel off; the plasma nitriding process can harden the surface of the sphere, but The corrosion resistance of this process is poor, and it cannot be applied to strong corrosion fields such as chemical industry; the process of surfacing hard alloy on the surface of the sphere is complicated, low in efficiency, and easily deforms the parts

The Chinese patent discloses a large-scale ball shot blasting device. The shot blasting can make the casting obtain good surface properties, but due to the particularity of the shape of the ball, the shot blasting can easily cause the surface roughness of the ball to be high, and the surface hardness and residual stress are not uniform. The phenomenon

The Chinese patent discloses a ball rolling device and a ball rolling method, but the residual compressive stress induced on the surface of the ball by a single rolling strengthening is relatively low, and the residual compressive stress affects the shallow layer

The Chinese patent discloses a method and device for surface modification of laser peening composite rolling strengthening, and proposes a combination of rolling strengthening and laser peening to obtain better surface strengthening quality and uniform residual stress distribution. However, due to the large volume of the rolling wheel in the patent, it is more suitable for strengthening large-area regular block or plate metal materials, and cannot achieve precise strengthening of spherical parts or other irregular and complex surfaces.

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