Numerical control ultrasonic shot peening process method based on dynamic pressure signal adjustment

Abstract

The invention provides a numerical control ultrasonic shot peening process method based on dynamic pressure signal adjustment, and belongs to the technical field of shot peening machining. The method is based on a common three-axis numerical control machine tool, impact force formed after a striker impacts on the surface of a material and rebounds in the ultrasonic shot peening process serves as a monitoring signal, and the difference between a real-time pressure signal and a specific signal is analyzed by means of a ceramic capacitance pressure sensor and a pressure dynamic measuring system so that a lifting worktable servo motor is driven to move to enable the pressure signal to be close to the specific signal, and therefore the impact force borne by the material in a shot peening area keeps stable; in the deformation process of a workpiece to be peened, the workpiece overcomes extension or contraction of rubber friction needed by moving of a dynamic clamping device in the X direction, the Y direction and the Z direction, so that the clamping device is suitable for the spatial position of a clamping point of the workpiece to be peened in real time. According to the method, peening strength of each area is consistent with a theoretical value specified by the process, the high-precision peening forming and strengthening effects are achieved, and the method has high feasibility and practicality in peening machining of large aviation structural components.

Description

technical field [0001] The invention relates to the field of advanced shot-peening technology, in particular, it can carry out equal-intensity ultrasonic shot-peening strengthening, forming or shape-correction on integral shot-peening workpieces with complex geometric features. Background technique [0002] Ultrasonic shot peening (USP) is a new type of surface modification method. This technology uses ultrasonic vibration mechanical energy to drive projectiles or colliders to hit the metal surface at high speed, so that the impacted surface and its underlying metal materials are plastically deformed and extended, and the residual material is introduced. It is an advanced shot peening forming and strengthening process that gradually causes the plate to bend and deform toward the sprayed surface to achieve the desired shape while compressing the stress. Compared with traditional shot peening, ultrasonic shot peening can obtain greater hardened layer depth and compressive stre...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the development of CNC ultrasonic shot peening technology, this patent proposes a process method for ultrasonic shot peening strengthening, forming or shape correction of complex workpieces using ordinary three-axis CNC machine tools

The purpose of the present invention is to convert the intensity of ultrasonic shot peening into the pressure signal of the impact pin on the horn, monitor it, compare and analyze it with the specified pressure signal, drive the servo motor to control the lifting of the workbench, and make the pressure signal real-time Approaching the specified pressure signal to achieve the purpose of equal-intensity shot peening; at the same time, the invention proposes an adaptive dynamic clamping device to solve the clamping problem during the deformation and extension of the sheet metal

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