CN103409599B - Device and method for strengthening gear of gear pump by using underwater laser impact - Google Patents
Device and method for strengthening gear of gear pump by using underwater laser impact Download PDFInfo
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- CN103409599B CN103409599B CN201310384126.9A CN201310384126A CN103409599B CN 103409599 B CN103409599 B CN 103409599B CN 201310384126 A CN201310384126 A CN 201310384126A CN 103409599 B CN103409599 B CN 103409599B
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Abstract
The invention relates to a device and method for strengthening a gear of a gear pump by using underwater laser impact. Gear workpieces are mounted on a multistage mandrel, the multistage mandrel is provided with a plurality of mandrel shoulders where the gear workpieces of different sizes can be mounted, and a whole workpiece system is located in an aqueous solution. Strong laser emitted by a high-power pulsed laser generating device is focused on the surface of the gear, and a large number of high-pressure plasma is induced by high-energy laser and impacts the surface of the gear at a high speed so as to form primary impact waves; and furthermore, when the aqueous solution is broken down by the laser, air bubbles are produced nearby the surface of the gear, the air bubbles swell after the air bubbles continue to absorb laser energy, the surface of the gear is impacted when the air bubbles burst finally so as to form secondary impact waves, and uniform and stable dislocation, refined grains and surface-layer residual compressive stress can be formed on the surface layer and subsurface layer of the gear under the integrated action of the two kinds of impact waves, so that the contact strength and fatigue resistance of the gear workpieces are improved effectively, and the wear resistance and corrosion resistance of the gear workpieces are improved.
Description
Technical field
The invention belongs to gear surface intensive treatment technology, refer in particular to the apparatus and method of a kind of high power laser light underwater shock strengthening gear pump gear.
Background technology
Toothed gear pump is increasingly extensive as the application of a kind of important Hydraulic power units in modern industrial equipment, also more and more higher to the requirement of toothed gear pump performance.And a pair gear in toothed gear pump is the element of most critical, the intensity of gear and the life cycle of pump have important relation, toothed gear pump under arms in process often because the factors such as gear teeth face wearing and tearing, viscous deformation cause destruction, the inefficacy of toothed gear pump, therefore be necessary to carry out surface Hardening Treatment to gear pump gear, improve the contact strength of gear pump gear, wear resistance and fatigue lifetime.
Laser surface intensified is a kind of novel gear surface intensifying technology, its energy cleanliness without any pollution, and heat affected zone is little, can overcome the hardened case distribution inequality of traditional gear surface reinforcing process, be out of shape the shortcomings such as large.And underwater laser impact utilizes water to retrain the diffusion of vapour to strengthen shock strength and to utilize Water transport shockwave, utilize the laser breakdown aqueous solution to produce bubble collapse phenomenon in addition and strengthen impact effect further.
Summary of the invention
The object of the present invention is to provide a kind of apparatus and method of underwater laser shock peening gear pump gear workpiece, be used for improving quality and the efficiency of gear surface shock peening, reduce the energy consumption of gear surface reinforcing process.
The technical solution used in the present invention is: a kind of device of underwater laser shock peening gear pump gear, comprise laser generating system and workpiece system, described laser generating system is by high power pulsed laser generating unit, total reflective mirror and laser Machining head composition, it is characterized in that, described laser Machining head and described workpiece system are all positioned at reaction vessel, described workpiece system comprises digitial controller, gear, thread jaw chuck, multistage mandrel, nut, top, worktable, hoisting appliance, pedestal, described multistage mandrel is successively by thread jaw chuck canned paragraph, the gear supporting section composition of transition section and some different diameter of axle sizes, described thread jaw chuck canned paragraph is fixed in the thread jaw chuck that is connected with described gear, the gear supporting section of each section described is equipped with the screw thread matched with nut, wherein the end-face central hole of the gear supporting section of the minimum diameter of axle is located with the described top integrated support realized described multistage mandrel that coordinates, described gear and be describedly toply positioned on described worktable, described hoisting appliance is fixedly mounted on the below of described worktable, described pedestal is provided with X and Y-direction track, and the bottom of described worktable is connected with Y-direction track with the X on described pedestal with Y-direction guide rail by X, described digitial controller carrys out the upper and lower displacement of adjusting operating platform by controlling described hoisting appliance, described digitial controller carrys out the left and right displacement of adjusting operating platform by control X and Y-direction guide rail, described digitial controller regulates the rotating speed of multistage mandrel by the rotation controlling described gear and turns to.
In such scheme, also comprise a subsystem, described subsystem is made up of flow regulator, liquid-storing box and electric pump, described flow regulator one end is connected with the water inlet of described reaction vessel, the other end is connected with described liquid-storing box, and described electric pump one end is connected with described liquid-storing box, and the other end is connected with the water outlet of described reactor lower end, by electric pump, the water solution cycle in reaction vessel is flowed, described flow regulator controls the velocity of flow of the aqueous solution in reaction vessel.
In such scheme, described high power pulsed laser generating unit, described digitial controller and described flow regulator are by computer control.
A method for underwater laser shock peening gear pump gear, comprises following steps:
A. pre-treatment gear workpieces: with washes of absolute alcohol gear workpieces surface, then pitch-dark at gear surface even application, pitch-dark thickness is at 0.16 ~ 0.4mm;
B. the location clamping of gear workpieces: the thread jaw chuck canned paragraph of multistage mandrel is fixed in thread jaw chuck, pretreated gear workpieces is placed on corresponding gear supporting section according to its size difference, tighten the nut on each section of gear supporting section, realize the location clamping of gear workpieces in multistage mandrel; With top withstand the centre hole of multistage mandrel end face after to shake top handle locking top, the location clamping that chuck handle realizes multistage mandrel is grabbed in shake three;
C. regulate digitial controller to control worktable, hoisting appliance and gear, laser spot center is positioned on the joint degree circle of gear workpieces, and laser beam is substantially vertical with the tangent line of Involute gear;
D. in reaction vessel, inject the aqueous solution to the water surface exceed gear highest point 20 ~ 40cm, it is 0.6 ~ 1L/s that adjust flux setter arranges flow, opens electric pump and water solution cycle is flowed;
E. high power laser light generating unit is opened, by computer installation laser parameter, high power laser light generating unit sends laser focusing to gear surface, and the running order of digitial controller pinion transmission case, hoisting appliance 2 and worktable 3 carries out the laser impact intensified process of gear workpieces.
F
.close all devices, by after shock treatment gear workpieces dismounting after, remove surface residual pitch-dark and with ethanol, surface cleaning is clean.
In aforesaid method, in nut screwing clamping process, in order to protect gear workpieces surface from the infringement of nut snap-in force, a pad can be set between nut and gear workpieces.
In aforesaid method, the laser parameter that high power laser light generating unit sends laser is: optical maser wavelength 1064nm, pulsewidth 30ns, spot diameter 6mm, laser energy 32 ~ 50J, frequency 5HZ.
In aforesaid method, laser-impact process is that laser is strafed to tooth root from tooth top, tooth top strafes speed 180 ~ 220mm/min, involute urve strafes speed 110 ~ 160mm/min, along the laser-impact process continuing next week after Y direction moves 3mm after gear workpieces rotates a circle, so circulation is until complete the processing in whole gears meshing face.
The invention provides a kind of method and apparatus of underwater laser shock peening gear pump gear.One of the method innovation is the method proposing underwater laser shock peening gear, utilizes the aqueous solution to enhance the effect of laser-impact, has saved the energy consumption of laser impact intensified gear workpieces.Two of innovation be to propose a kind of can the multistage mandrel of the multiple gear of clamped one time, saved the clamping time, improve working (machining) efficiency.Install with in multistage mandrel by scribbling pitch-dark gear workpieces, the position of adjusting gear relative to laser facula is come by digitial controller control worktable and gear, make laser spot center on gear compound graduation circle, and laser beam is roughly vertical with Involute gear tangent line, open laser apparatus, gasify rapidly after pitch-dark absorbing laser energy, under the constraint of water layer, a large amount of high pressure plasma high speed impact gear surface forms one-shot ripple; In addition, cavitation phenomena is produced during the laser breakdown aqueous solution, impact teeth wheel surface of crumbling and fall after cavity continuation absorbing laser energy forms secondary pulse ripple, under the comprehensive action of two kinds of shockwave, Surface of Gear and time top layer can form uniform and stable dislocation, the crystal grain of refinement and Residual stress of superficial layer, the contact strength of effective raising gear workpieces and anti-fatigue performance, improve wear resistance and the erosion resistance of gear workpieces.
Beneficial effect of the present invention: 1. after the process of underwater laser shock peening, Surface of Gear and time top layer form uniform and stable dislocation, the crystal grain of refinement and Residual stress of superficial layer, the contact strength of effective raising gear workpieces and anti-fatigue performance, improve wear resistance and the erosion resistance of gear workpieces;
2.the existence of the aqueous solution enhances the effect of laser-impact, has saved energy compared with the laser impact intensified technique in air dielectric, and laser-impact process does not change the dimensional precision of gear;
3.multistage mandrel is provided with the multi-stage gear supporting section of different size, can the simultaneously multiple gear workpieces of clamping, has saved the clamping time, has improve working (machining) efficiency.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of apparatus of the present invention..
Fig. 2 is the structural representation of multiaxis mandrel.
In figure, 1. pedestal 2. hoisting appliance; 3. worktable; 4. water outlet; 5. electric pump; 6. liquid-storing box; 7. liquid-transport pipe-line; 8. water inlet; 9. flow regulator; 10. computer; 11. digitial controllers; 12. high power laser light generating units; 13. collimator and extender mirrors; 14. condenser lens 15. concavees lens; 16. laser beams; 17. total reflective mirrors; 18. reaction vessels; 19. laser Machining heads; 20. condenser lenses; 21. protective glasses; 22. gear workpieces; 23. gears; 24. 3 grab chuck; 25. 3 grab chuck handle; 26. multistage mandrel; 261. thread jaw chuck canned paragraphs; 262. transition section; 263. gear supporting sections; 264. centre hole; 27. pads; 28. nuts; 29. top handles; 30. is top; 31. set levers.
Embodiment
The material 40CrNiMo of gear workpieces 22, modulus m=4, tooth number Z=23, facewidth B=20mm, multistage mandrel 26 left end is inserted three grabs in chuck 24, gear workpieces 22 pad 27 and nut 28 are fixed to clamp in multistage mandrel 26, tightens top handle 29 and three and grab chuck handle 25 multistage mandrel 26 is clamped, finally tighten set lever 31.Regulate digitial controller 11 to make laser beam 16 substantially vertical with the tangent line of the Involute gear on gear workpieces, open laser apparatus and laser parameter is set: laser energy 25J, pulsewidth 20ns, wavelength 1064nm, frequency 5Hz, spot diameter 6mm.In reaction vessel 18, inject the aqueous solution to exceeding gear vertex 15cm, adjust flux setter 9 arranges flow 1L/s, opens electric pump 5 and water solution cycle is flowed.Start laser apparatus and digitial controller 11 is set, laser is made to be 220mm/min in tooth top sweep velocity, involute urve sweep velocity is 110mm/min, laser apparatus is suspended after run-down, control worktable 3 by digitial controller 11 and move 3mm along Y direction, continue laser scanning, until complete the processing of whole mating surface.After laser-impact completes, close all power supplys, take off gear, after removing is remaining pitch-dark, use washes of absolute alcohol.
The gear rushed by underwater laser after level strengthening carries out accuracy test and surface residual stress detects discovery, and the very little class of precision not affecting gear of the gear shifting quadrant texturing after laser treatment, gears meshing face is residual compressive stress.
Claims (7)
1. the device of a underwater laser shock peening gear pump gear, comprise laser generating system and workpiece system, described laser generating system is by high power pulsed laser generating unit (12), total reflective mirror (17) and laser Machining head (19) composition, it is characterized in that, described laser Machining head (19) and described workpiece system are all positioned at reaction vessel (18), described workpiece system comprises digitial controller (11), gear (23), thread jaw chuck (24), multistage mandrel (26), nut (28), top (30), worktable (3), hoisting appliance (2) and pedestal (1), described multistage mandrel (26) is successively by thread jaw chuck canned paragraph (261), gear supporting section (263) composition of transition section (262) and some different diameter of axle sizes, described thread jaw chuck canned paragraph (261) is fixed in the thread jaw chuck (24) that is connected with described gear (23), the gear supporting section (263) of each section described is equipped with the screw thread matched with nut (28), the gear supporting section (263) of each section described is also provided with the pad (27) matched with described nut (28), wherein the end-face central hole (264) top with described (30) of the gear supporting section of the minimum diameter of axle coordinates the integrated support realized described multistage mandrel (26) to locate, described gear (23) and described top (30) are positioned on described worktable (3), described hoisting appliance (2) is fixedly mounted on the below of described worktable (3), described pedestal (1) is provided with X and Y-direction track, and the bottom of described worktable (3) is coordinated with the X on described pedestal (1) and Y-direction track by X and Y-direction guide rail, described digitial controller (11) carrys out the upper and lower displacement of adjusting operating platform (3) by controlling described hoisting appliance (2), described digitial controller (11) carrys out the left and right displacement of adjusting operating platform (3) by control X and Y-direction guide rail, described digitial controller (11) regulates the rotating speed of multistage mandrel (26) by the rotation controlling described gear (23) and turns to.
2. the device of a kind of underwater laser shock peening gear pump gear according to claim 1, is characterized in that, also comprise a subsystem; Described subsystem is made up of flow regulator (9), liquid-storing box (6) and electric pump (5), described flow regulator (9) one end is connected with the water inlet (8) of described reaction vessel (18), the other end is connected with described liquid-storing box (6), described electric pump (5) one end is connected with described liquid-storing box (6), the other end is connected with the water outlet (4) of described reactor (18) lower end, by electric pump (5), the water solution cycle in reaction vessel (18) is flowed, described flow regulator (9) controls the velocity of flow of reaction vessel (18) the interior aqueous solution.
3. the device of a kind of underwater laser shock peening gear pump gear according to claim 1 and 2, it is characterized in that, described high power pulsed laser generating unit (12), described digitial controller (11) and described flow regulator (9) control by computer (10).
4. a method for underwater laser shock peening gear pump gear, comprises following steps:
A. pre-treatment gear workpieces: with washes of absolute alcohol gear workpieces surface, then pitch-dark at gear surface even application;
B. the location clamping of gear workpieces: the thread jaw chuck canned paragraph (261) of multistage mandrel is fixed in thread jaw chuck, pretreated gear workpieces (22) is placed on corresponding gear supporting section (263) according to its size difference, tighten the nut (28) on each section of gear supporting section, realize the location clamping of gear workpieces (22) in multistage mandrel, a pad (27) is set between described nut (28) and described gear workpieces (22); ; Shaking top handle (29) afterwards with the centre hole (264) that top (30) withstand multistage mandrel end face locks top, and the location clamping that chuck handle (25) realizes multistage mandrel is grabbed in shake three;
c.regulate digitial controller to control worktable, hoisting appliance and gear, laser spot center is positioned on the joint degree circle of gear workpieces, and laser beam is substantially vertical with the tangent line of Involute gear;
d.in reaction vessel, inject the aqueous solution to the water surface exceed gear highest point 20 ~ 40cm, it is 0.6 ~ 1L/s that adjust flux setter arranges flow, opens electric pump and water solution cycle is flowed;
e.open high power laser light generating unit, by computer installation laser parameter, high power laser light generating unit sends laser focusing to gear surface, and the running order of digitial controller pinion transmission case, hoisting appliance 2 and worktable 3 carries out the laser impact intensified process of gear workpieces;
f.close all devices, by after shock treatment gear workpieces dismounting after, remove surface residual pitch-dark and with ethanol, surface cleaning is clean.
5. the method for a kind of underwater laser shock peening gear pump gear according to claim 4, it is characterized in that, the pitch-dark thickness in steps A is 0.16 ~ 0.4mm.
6. the method for a kind of underwater laser shock peening gear pump gear according to claim 4, it is characterized in that, laser-impact process is that laser is strafed to tooth root from tooth top, tooth top strafes speed 180 ~ 220mm/min, involute urve strafes speed 110 ~ 160mm/min, along the laser-impact process continuing next week after Y direction moves 3mm after gear workpieces (22) rotates a circle, so circulation is until complete the processing in whole gears meshing face.
7. according to the method for any one underwater laser shock peening gear pump gear described in claim 4-6, it is characterized in that, the laser parameter that high power laser light generating unit sends laser is: optical maser wavelength 1064nm, pulsewidth 30ns, spot diameter 6mm, laser energy 32 ~ 50J, frequency 5HZ.
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| CN201310384126.9A CN103409599B (en) | 2013-08-29 | 2013-08-29 | Device and method for strengthening gear of gear pump by using underwater laser impact |
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| CN113523708B (en) * | 2021-08-24 | 2022-08-23 | 南通大学 | Method and device for repairing tooth surface micro-contact fatigue damage |
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Application publication date: 20131127 Assignee: Jiangsu Zhongli Gear Co., Ltd. Assignor: Jiangsu University Contract record no.: 2015320000620 Denomination of invention: Device and method for strengthening gear of gear pump by using underwater laser impact Granted publication date: 20150610 License type: Common License Record date: 20151023 Application publication date: 20131127 Assignee: Jiangsu Hongchang Technology Co., Ltd. Assignor: Jiangsu University Contract record no.: 2015320000621 Denomination of invention: Device and method for strengthening gear of gear pump by using underwater laser impact Granted publication date: 20150610 License type: Common License Record date: 20151023 |
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Application publication date: 20131127 Assignee: XINGHUA DONGHUA GEAR CO., LTD. Assignor: Jiangsu University Contract record no.: 2016320000076 Denomination of invention: Device and method for strengthening gear of gear pump by using underwater laser impact Granted publication date: 20150610 License type: Common License Record date: 20160302 Application publication date: 20131127 Assignee: Shanghai Ruier Industrial Co., Ltd. Assignor: Jiangsu University Contract record no.: 2016320000077 Denomination of invention: Device and method for strengthening gear of gear pump by using underwater laser impact Granted publication date: 20150610 License type: Common License Record date: 20160302 |
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