Device and method for ultrasonic reinforcement of mortises

The invention discloses a device and a method for ultrasonic reinforcement of a mortise. The device comprises a mortise cover plate and a working chamber, the mortise cover plates are fixed to the two sides of a to-be-machined part, and the mortise cover plates are attached to mortises of the to-be-machined part to form independent mortise cavities. A part to be machined is fixed on the three-jaw chuck; one side of the working chamber is an arc surface used for being matched with an outer circle mortise of a part to be machined, and the other side of the working chamber is a plane used for being connected with an ultrasonic vibration device. And the working chamber is used for loading and processing a pellet medium to carry out mortise ultrasonic reinforcement. Ultrasonic shot peening strengthening is adopted for the mortises, shots continuously collide in a closed cavity, and finally a strengthening layer on the surface is uniform. According to the ultrasonic shot peening device, ultrasonic shot peening stre