CN1313164A - Laser impact processor of Nd glass - Google Patents

Abstract

A laser impacting processor of Nd glass is composed of high-power laser generator consisting of Q-regulating laser oscillator, reflector, phosphate Nd-glass laser amplifier and Fresnel isolator, combined light beam transmission device with movable joint, and laser impact head. Said laser oscillator is multiple transverse modes added phosphate Nd-glass Q-regulating one. Its advantages include compact structure, small size, light weight and no pollution. It can be used for impact processing of metal part.

Description

Laser impact processor of Nd glass

The present invention relates to laser application technique.

It is the laser processing technology that a kind of new development is got up that laser-impact is handled (LSP).Its operation principle is to utilize high power laser light irradiation to metal material surface, produce the high-intensity plasma of high-temperature high-density, thereby form high-intensity impact stress ripple, this shock wave affacts on metal works or the material surface, make its top layer that plastic deformation take place, to improve the anti-fatigue performance of metal material, increase the service life.In the existing neodymium glass device of high power laser, its laser oscillator is single transverse mode output, and it has the smaller advantage of the angle of divergence.But this laser oscillator output energy is very little, can not satisfy this application requirements, needs multistage amplification during use, makes its structure complicated.Therefore at present the overall volume that is used for the device of high power laser that LSP handles both at home and abroad is huge, complicated operation not only, and can only be fixed on a certain locality, and the direction of illumination of laser beam is fixed, and it is very inconvenient to use.On the other hand, glass slag splash phenomena everywhere can occur during owing to practical operation, also can't use in the production scene.

The objective of the invention is to,, provide a kind of complete machine of realizing to move, operate high power nd glass laser shock peening device comparatively convenient, safety non-pollution at deficiency of the prior art.

Purpose of the present invention is realized by following mode.

Laser impact processor of Nd glass of the present invention, comprise by the Q-switch laser oscillator, space filtering and beam expander, speculum, the phosphate neodymium glass laser amplifier, the high power laser light generating means that the Fresnel isolator is formed, it is characterized in that, wherein employed neodymium glass Q-switch laser oscillator is the phosphate neodymium glass Q-switch laser oscillator of many transverse mode stack outputs, and tipping has a combined live movable joint beam Propagation device and the laser-impact head that can make laser beam produce strong shock wave successively on the laser optical path that described high power laser light generating means produces.Described combined live movable joint beam Propagation device is to be combined by the light guide bundles that turning joint light-conducting arm and multifiber constitute; Described laser-impact head can constitute like this: it comprises convergent lens, the constraint glass plate that is installed in two ends in the same cylindrical shell, on the outer surface of constraint glass plate, scribble the luminous energy absorber coatings, constraint glass plate, convergent lens are fixed by forward and backward lid respectively, the protecgulum middle part that contacts with the luminous energy absorber coatings is metal or nonmetallic thin layer, also can establish a glass baffle plate at the cylindrical shell middle part.

In the prior art, used Q-switch laser oscillator is the neodymium glass Q-switch laser oscillator of single transverse mode, the pulsed laser energy of its output only is the millijoule level, could actually use after must using multistage amplification and isolator, it is long that its overall light path can reach tens of rice, when carrying out the shock treatment operation, the glass slag that splashes everywhere is very easy hurts sb.'s feelings, and contaminated environment.Laser impact processor of Nd glass of the present invention, adopted the neodymium glass Q-switch laser oscillator of many transverse mode stack outputs, the pulsed laser energy of its output can reach a joule magnitude easily, it is very little to have overcome the neodymium glass Q-switch laser oscillator output energy that uses single transverse mode in the prior art, can not satisfy the shortcoming of application requirements.Therefore significantly reduced the amplifier that is used for amplified energy and the number of isolator in the whole system, made its structure tube single, compact, dwindled the volume and weight of whole device effectively, also be convenient to debugging, operation and safeguard.Experiment shows that the overall dimension of this processor can be controlled in 2.2 (length) * 0.8 (wide) * 1.3 (height) the m scopes, about the about 250kg of weight, can move by complete machine, thereby can be advantageously used in the intensive treatment of metal surface, and can use in the production scene.On the other hand, use simple optical fiber as the beam Propagation device in the prior art, through-put power is low, and this machine adopts the turning joint beam Propagation device that is combined by turning joint light-conducting arm and multifiber, can make the bigbore laser beam of high power be transferred to arbitrary orientation effectively, very convenient.

The laser-impact head that the present invention uses on the outer surface of luminous energy absorber coatings attached to the constraint glassy layer, has changed the way that in the prior art luminous energy absorber coatings directly is coated in surface of the work.Not only help operation, also can not influence the place beyond the impact site for the treatment of of workpiece; And after coating absorbs laser, produce the plasma blast and when forming shock wave, broken glass slag is closed in the inside of impacting a cylindrical shell, and can not splash everywhere, guaranteeing personnel's on the scene personal safety, and avoid contaminated environment.Therefore complete machine directly can be placed the production scene to use.

Laser-impact head of the present invention, can with the supporting use of high power laser light generating means of the present invention, also can be used in the laser impact intensified processing unit of prior art.

Be further described below by embodiment and accompanying drawing thereof.

Fig. 1 is the complete machine structure schematic diagram of laser impact processor of Nd glass of the present invention.

Fig. 2 is the structural representation of laser-impact head of the present invention.

Referring to Fig. 1, what express in its square frame is described high power light laser generating means, and its power output is the m. gigawatt (GW) level, and pulsewidth is 10 nanosecond.Wherein, (1) the phosphate neodymium glass Q-switch laser oscillator of many transverse mode stack outputs, the laser beam that this oscillator produces by space filtering and beam expander (2) after, go into phosphate neodymium glass laser amplifier (4) and Fresnel isolator (5) through speculum (3) two secondary reflections are laggard, export by phosphate neodymium glass amplifier (9) back again through speculum (6) then.(7) be laser charging and triggering power supply, (8) are electric-optically Q-switched power supply.This two power supply is connected with amplifier (4) (9) with oscillator (1) respectively, and dotted line has been represented its annexation among the figure.In actual use, each parts connection in the above-described high power laser light generating means, installation and debugging and prior art are similar.By contrast, this device has adopted the phosphate neodymium glass Q-switch laser oscillator of many transverse mode stack outputs, the laser beam energy height of output.Because only use dual-stage amplifier and an isolator in the whole high power laser light generating means, overall volume is little, in light weight, therefore can be with all component-assembled in same casing, with convenient transportation and use.Tipping has a combined live movable joint beam Propagation device (10) and the laser-impact head (19) that can make laser beam focus on and produce strong shock wave successively on the laser optical path of described high power laser light generating means output.During use, the output of laser-impact head (12) is pressed close to need workpiece (13) surface of reinforcement.When emission during laser, the luminous energy absorber coatings in the laser-impact head generates the explosion wave that plasma produced after receiving the radiation of laser, impacts the metal works surface, makes its top layer that plastic deformation take place, and reaches strengthening effect.Arrow among this figure is represented the direct of travel of laser beam.

Referring to Fig. 2, (14) are convergent lens, and (15) are cylindrical shell, and (13) are the fixing bonnet of convergent lens, and its periphery is provided with external screw thread and matches with internal thread on the cylindrical shell inner hole wall.(16) be the glass baffle plate, (18) are the constraint glass plate.On the lateral surface of this glass plate, scribble luminous energy absorber coatings (19).From the laser beam of combined live movable joint beam Propagation device output through convergent lens (14), glass baffle plate (16) with retrain glass plate (18), irradiation is located to luminous energy absorber coatings (19) then, high power laser light makes this coating produce plasma and blast forms shock wave, and the impact surface of the work is finished and strengthened function.(17) be interior cover, it plays the effect of fixing glass baffle plate (16), and this baffle plate glass fragment that forms that can prevent to explode flies to the convergent lens place, avoids it contaminated.The other end of cover in constraint glass plate (18) is arranged on, and have protecgulum (20) fixing.The mid portion of protecgulum is a thin layer, shock wave can be delivered on the surface of the work.The described luminous energy absorber coatings that adheres on the constraint glass plate can use the blacking that can buy on the market, as pitch-dark, also can use other special coating.The thickness of coating is generally about 50 microns.Interface place at protecgulum and surface of the work, protecgulum and absorber coatings also scribbles silicone oil, to eliminate the gap, helps improving the shock wave transmitance.

Claims (4)

1. laser impact processor of Nd glass, comprise the high power laser light generating means of forming by neodymium glass Q-switch laser oscillator, space filtering and beam expander, speculum, phosphate neodymium glass laser amplifier, Fresnel isolator, it is characterized in that, employed Q-switch laser oscillator is the phosphate neodymium glass Q-switch laser oscillator of many transverse mode stack outputs, and tipping has a combined live movable joint beam Propagation device and the laser-impact head that can make laser beam produce strong shock wave successively on the laser optical path that described high power laser light generating means produces.

2. laser impact processor of Nd glass as claimed in claim 1 is characterized in that, described combined live movable joint beam Propagation device is to be combined by the light guide bundles that turning joint light-conducting arm and multifiber constitute.

3. laser impact processor of Nd glass as claimed in claim 1, it is characterized in that described laser-impact head can constitute like this: it comprises convergent lens and the constraint glass plate that is installed in two ends in the same cylindrical shell, on the outer surface of constraint glass plate, scribble the luminous energy absorber coatings, constraint glass plate, convergent lens are fixed by forward and backward lid respectively, and the protecgulum middle part that contacts with the luminous energy absorber coatings is metal or nonmetallic thin layer.

4. laser impact processor of Nd glass as claimed in claim 3 is characterized in that the cylindrical shell middle part of described laser-impact head can be provided with a glass baffle plate.