Laser shock peening absorbing layer and clamping device thereof

Abstract

The invention discloses a laser shock peening absorbing layer and a clamping device of the laser shock peening absorbing layer. The laser shock peening absorbing layer mainly comprises main components of ferroferric oxide powder, an adhesion agent and carbon powder, wherein the ferroferric oxide is black, and has a good absorbing function for laser adopted by the invention, and also has magnetism; the clamping device of the absorbing layer is an electromagnet arranged on the back surface of a workpiece, the absorbing layer adopts a coating mode, is directly covered on the surface of the workpiece, and is aired in air, with the coating thickness of 80-150 micrometers; and after the laser shock peening is finished, the electromagnet is enabled to be in a power failure sate, and is capable of automatically enabling the absorbing layer to drop from the surface of the workpiece. By adopting the special absorbing layer and the clamping device of the special absorbing layer disclosed by the invention, the energy loss of laser shock waves can be remarkably reduced, the absorbing layer can be enabled to be automatically drop, and the surface subjected to laser shock does not need to be cleaned for the second time, thus the laser shock peening absorbing layer can be applied to laser shock peening of the surface of a metal workpiece.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a laser shock strengthening technology. Background technique [0002] Laser shock peening is a new type of 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 the part. Compared with conventional shot peening technology, its residual compressive stress layer is deeper; The principle of laser shock is to use pulsed laser to generate plasma explosion with the absorbing layer in a confined state, which can generate a pressure with an intensity of up to several Gigapascals, which propagates to the workpiece through the absorbing layer, and can generate high-amplitude residual compressive stress on the surface of the workpiece. Due to the protective effect of the absorbing layer, the surface of the workpiece will not be burned by heat. Th...

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Problems solved by technology

[0003] In the process of laser shock strengthening engine blades, the commonly used absorbing layer is aluminum foil and organic tape. In order to make the absorbing layer adsorb on the surface of the workpiece to be treated, glue is usually coated on one side of the absorbing layer, and the glued side is stuck on the surface of the workpiece to be treated. The surface of the workpiece, because the glue has a certain thickness, will cause a great loss when the shock wave propagates to the surface of the workpiece, which will affect the impact effect. At the same time, the glue is attached to the surface of the workpiece, and the workpiece needs to be cleaned again; the application number is 200610039503.5 The Chinese patent "A strippable coating for laser shock treatment" proposes a strippable coating. The prepared coating is applied to the workpiece, and after drying, it is strengthened by laser shock. Because during the laser shock process, the shock wave is in the coating and The reflection on the surface of the workpiece produces a strong tensile stress, which will cause the paint and the surface of the workpiece to fall off, affecting subsequent processing

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