A method and device for adjusting the spot size of pulsed laser shock strengthening
A pulse laser and impact strengthening technology, which is applied in the field of material strengthening treatment, can solve the problems that the strengthening effect of variable curvature surface structure cannot be guaranteed, and the uniformity of impact strengthening can not be guaranteed, so as to achieve the lifting effect, reduce the surface roughness, and improve the uniformity sexual effect
Active Publication Date: 2022-04-15
GUANGDONG UNIV OF TECH
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Problems solved by technology
[0005] For example, the Chinese patent CN107841616A is a method and system for strengthening engine blades. The laser spot is adjusted according to the surface curvature. However, this patent sets a fixed spot size for a surface with a certain curvature range. The choice of spot size is too limited to ensure impact strengthening. Uniformity, strengthening effect of variable curvature surface structure is not guaranteed
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[0034] The technical solutions in the examples of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the examples of the present invention. Obviously, the described examples are only some examples of the present invention, not all examples.
[0035] combine figure 1 , figure 2 , image 3 as well as Figure 4 , embodiment 1, is the spot size adjustment method of a kind of pulsed laser shock strengthening that the present invention proposes, and described method comprises the following:
[0036] Step 110: Detect the surface features of the target strengthening area of the part to be processed, and determine the surface curvature value K of the target strengthening area i range;
[0037] Wherein, the surface structure of the strengthened area of the part to be processed in the present invention is complex and is a variable curvature surface, and the surface curvature is different at different positions. ...
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Abstract
The present invention provides a spot size adjustment method for pulsed laser shock strengthening, which includes the following steps: Step 110: Detect the surface features of the target strengthening area of the part to be processed, and determine the surface curvature value K of the target strengthening area i range; Step 120: Combining the technical indicators that the pulsed laser can reach, determine the surface curvature value K within the range i The corresponding spot size P; Step 130: Obtain the surface curvature value K of the moving path when the target strengthening area of the part to be processed acts on it in real time i , according to the surface curvature value K i Adjust the spot size P to continue impact strengthening. The invention adjusts the spot size according to the surface curvature by detecting the surface characteristics of the strengthened area of the part to be processed, adjusts the uniformity of the pressure shock wave on the surface with different curvatures, improves the effect of laser shock strengthening; and maintains the consistency of the entire moving path to reduce the surface roughness , which improves the uniformity of residual compressive stress distribution and reduces the surface roughness of the strengthened area of the part to be processed.
Description
technical field [0001] The invention relates to the technical field of material strengthening treatment, in particular to a spot size adjustment method and device for pulse laser shock strengthening. Background technique [0002] Laser shock peening is a new type of material surface strengthening technology. It mainly passes through the transparent confinement layer with ultra-high power and ultra-short pulse width laser beams, and acts on the absorbing layer coated on the surface of the metal target. Under the action of rapid gasification, the formation of high-temperature, high-pressure plasma. Due to the confinement of the confinement layer, the plasma generates super shock waves on the metal surface. When the peak pressure of the shock wave exceeds the Hugoniot elastic limit of the material, plastic deformation and microstructure changes occur on the surface of the material. After the laser shock is over, due to the reaction of the material in the shock area, a certain...
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IPC IPC(8): C21D10/00
CPCC21D10/005
Inventor 瞿祥明张永康何卫锋
Owner GUANGDONG UNIV OF TECH