Path planning device and path planning method for laser shot peening strengthening curved surface

Abstract

The invention discloses a path planning device of a laser shot blasting strengthened hook surface. The path planning device comprises a high energy pulse laser, a positioning laser, a CCD displayer, a correction block, a correction reflection film and a mechanical arm. The positioning laser and the CCD displayer are symmetrically arranged on the two sides, the correction block is provided with a correction plane, the correction reflection film is attached to the correction plane, the mechanical arm clamps and can freely adjust the correction block or a workpiece, and a visible laser beam is reflected to the CCD displayer. The invention further discloses a path planning method for the laser shot blasting strengthened hook surface. The parallel visible laser beam, the reflection film and the CCD displayer serve as positioning tools; the steps of distancing, positioning calibrating, tracing point positioning, coordinate recording, fitting of the coordinates into a trajectory path and the like are included; the device and method are adopted to conveniently and rapidly achieve running path planning of the hook surface in laser shot blasting strengthening, the method and device can be used for laser shot blasting strengthening of aircraft engine blades and steam turbine blades, the working position of the hook surface can be precisely located, the laser utilization rate is greatly improved, and power and density consistency in the strengthening process is ensured.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a path planning device for laser shot-peening strengthening curved surfaces. The invention also relates to a path planning method for laser shot-peening strengthening curved surfaces. Background technique [0002] Laser shot peening is a new material surface strengthening technology, which can obtain a high-amplitude residual compressive stress layer on the surface of metal parts, greatly improving the fatigue life of parts. Compared with conventional shot peening technology, its residual compressive stress layer is deeper . The principle of laser peening is to use pulsed laser (energy 1~100J, pulse width 10~30ns) to produce plasma explosion with the absorbing layer (aluminum foil or other materials) in a confined state (water film or glass), which can produce intensity up to several Gigapascal pressure, which spreads to the workpiece through the absorbing layer, can g...

AI Technical Summary

Problems solved by technology

When using offline programming software for path planning, the accuracy of the model, the manufacturing accuracy of the workpiece, and the positioning accuracy of the workpiece are extremely high. The cumulative error of these factors makes the trajectory compiled by the offline programming software have a large error from the actual required trajectory, and there is no effective The means to detect and eliminate these errors; therefore, the manual focus method is the most commonly used path planning method. However, the conventional manual focus mainly relies on eye observation, and the focus error is also large, and it is difficult to ensure that the laser beam is perpendicular to the curved surface. Incidence point, need to invent a suitable method for path planning

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