CN103409599A - 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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- CN103409599A CN103409599A CN2013103841269A CN201310384126A CN103409599A CN 103409599 A CN103409599 A CN 103409599A CN 2013103841269 A CN2013103841269 A CN 2013103841269A CN 201310384126 A CN201310384126 A CN 201310384126A CN 103409599 A CN103409599 A CN 103409599A
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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 a kind of apparatus and method of high power laser light underwater shock strengthening gear pump gear.
Background technology
Toothed gear pump is increasingly extensive as a kind of important application of Hydraulic power units in modern industrial equipment, also more and more higher to the requirement of toothed gear pump performance.And a pair of 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 often causes destruction, the inefficacy of toothed gear pump in process under arms because of factors such as gear teeth face wearing and tearing, viscous deformation, therefore be necessary gear pump gear is carried out to surface Hardening Treatment, improve contact strength, wear resistance and the fatigue lifetime of gear pump gear.
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 hardened layer skewness, the distortion shortcoming such as large of traditional gear surface reinforcing process.And underwater laser impacts the diffusion utilize water constraint vapour and strengthens shock strength and utilize water to transmit shockwave, utilize in addition the laser breakdown aqueous solution to produce the cavity phenomenon that crumbles and fall and further strengthen impact effect.
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 the high power pulsed laser generating unit, total reflective mirror and laser Machining head form, it is characterized in that, described laser Machining head and described workpiece system all are 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 the thread jaw chuck canned paragraph, the gear supporting section of transition section and some different diameter of axle sizes forms, described thread jaw chuck canned paragraph is fixed in the thread jaw chuck be connected with described gear, on the gear supporting section of described each section, be 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 and the described top integrated support realized described multistage mandrel that coordinates are located, described gear and described top being 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 the Y-direction track with the X on described pedestal with the 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 controlling X and Y-direction guide rail, described digitial controller is regulated the rotating speed of multistage mandrel and turns to by the rotation of controlling described gear.
In such scheme, also comprise a subsystem, described subsystem is comprised 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 aqueous solution in reaction vessel is circulated, described flow regulator is controlled 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 kind of method of underwater laser shock peening gear pump gear comprises following steps:
A. pre-treatment gear workpieces: with dehydrated alcohol, clean the gear workpieces surface, then evenly spraying is pitch-dark at gear surface, and pitch-dark thickness is at 0.16 ~ 0.4mm;
B. the location of gear workpieces clamps: 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 gear supporting section, realize that the location of gear workpieces on multistage mandrel clamps; Top handle locking is top with after the top centre hole that withstands multistage end face of mandrel, shaking, and shakes three and grabs the chuck handle and realize that the location of multistage mandrel clamps;
C. regulate digitial controller and control worktable, hoisting appliance and gear, the joint degree that makes laser spot center be positioned at gear workpieces is justified upper, and laser beam is substantially vertical with the tangent line of Involute gear;
D. to injected water solution to the water surface in reaction vessel, exceed gear highest point 20 ~ 40cm, it is 0.6 ~ 1L/s that the adjust flux setter arranges flow, opens electric pump the aqueous solution is circulated;
E. open the high power laser light generating unit, by the computer installation laser parameter, the 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 the dismounting of the gear workpieces after shock treatment, remove surperficial remaining pitch-dark and with ethanol, that surface cleaning is clean.
In aforesaid method, in the nut screwing clamping process, avoid the infringement of nut snap-in force in order to protect the gear workpieces surface, a pad can be set between nut and gear workpieces.
In aforesaid method, the laser parameter that the 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, the laser-impact process is that laser is strafed to tooth root from tooth top, tooth top is strafed speed 180 ~ 220mm/min, involute urve is strafed speed 110 ~ 160mm/min, gear workpieces rotates a circle and along Y direction, moves after 3mm and continue next all laser-impact and process afterwards, and so circulation is until complete the processing of whole gear mating surface.
The invention provides a kind of method and apparatus of underwater laser shock peening gear pump gear.One of the method innovation has been to propose the method for underwater laser shock peening gear, utilizes the aqueous solution to strengthen the effect of laser-impact, has saved the energy consumption of laser impact intensified gear workpieces.But two of innovation has been to propose the multistage mandrel of a plurality of gears of a kind of clamped one time, has saved the clamping time, has improved working (machining) efficiency.To scribble in pitch-dark gear workpieces installation and multistage mandrel, by digitial controller, control worktable and gear comes the position of adjusting gear with respect to laser facula, make laser spot center on the gear compound graduation circle, and laser beam is roughly vertical with the Involute gear tangent line, open laser apparatus, gasification rapidly after pitch-dark absorbing laser energy, a large amount of high pressure plasma high speed impact gear surfaces form the one-shot ripple under the constraint of water layer; In addition, during the laser breakdown aqueous solution, produce cavitation phenomena, the impact teeth wheel surface of crumbling and fall after cavity continuation absorbing laser energy forms the secondary pulse ripple, under the comprehensive action of two kinds of shockwave, Surface of Gear and time top layer can form crystal grain and the Residual stress of superficial layer of uniform and stable dislocation, refinement, effectively improve contact strength and the anti-fatigue performance of gear workpieces, improved wear resistance and the erosion resistance of gear workpieces.
Beneficial effect of the present invention: 1. after the underwater laser shock peening is processed, Surface of Gear and time top layer form crystal grain and the Residual stress of superficial layer of uniform and stable dislocation, refinement, effectively improve contact strength and the anti-fatigue performance of gear workpieces, improved wear resistance and the erosion resistance of gear workpieces;
2.The effect of laser-impact has been strengthened in the existence of the aqueous solution, compares and has saved energy with the laser impact intensified technique in air dielectric, and laser-impact is processed the dimensional precision that does not change gear;
3.Multistage mandrel is provided with the multi-stage gear supporting section of different size, and a plurality of gear workpieces of clamping, saved the clamping time simultaneously, improved working (machining) efficiency.
The 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 appliances; 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 controller; 12. high power laser light generating unit; 13. collimator and extender mirror; 14. condenser lens 15. concavees lens; 16. laser beam; 17. total reflective mirror; 18. reaction vessel; 19. laser Machining head; 20. condenser lens; 21. protective glass; 22. gear workpieces; 23. gear; 24. three grab chuck; 25. three grab the chuck handle; 26. multistage mandrel; 261. thread jaw chuck canned paragraph; 262. transition section; 263. gear supporting section; 264. centre hole; 27. pad; 28. nut; 29. top handle; 30. top; 31. set lever.
Embodiment
The material 40CrNiMo of gear workpieces 22, modulus m=4, tooth number Z=23, facewidth B=20mm, multistage mandrel 26 left ends are inserted to three grabs in chuck 24, gear workpieces 22 use pads 27 and nut 28 are fixed to clamp on multistage mandrel 26, tighten top handle 29 and three and grab chuck handle 25 by multistage mandrel 26 clampings, finally tighten set lever 31.Regulate digitial controller 11 and make the tangent line of the Involute gear on laser beam 16 and gear workpieces substantially vertical, open laser apparatus laser parameter is set: laser energy 25J, pulsewidth 20ns, wavelength 1064nm, frequency 5Hz, spot diameter 6mm.To the interior injected water solution of reaction vessel 18 to exceeding gear vertex 15cm, adjust flux setter 9 arranges flow 1L/s, opens electric pump 5 aqueous solution is circulated.Start laser apparatus and digitial controller 11 is set, making laser is 220mm/min in the tooth top sweep velocity, the involute urve sweep velocity is 110mm/min, after run-down, suspend laser apparatus, by digitial controller 11, control worktable 3 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, remove remaining pitch-dark clean with dehydrated alcohol afterwards.
Gear after the strengthening of underwater laser punching level is carried out to accuracy test and surface residual stress detection discovery, the very little class of precision that does not affect gear of the gear shifting quadrant texturing after laser treatment, the gear mating surface is residual compressive stress.
Claims (8)
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) form, it is characterized in that, described laser Machining head (19) and described workpiece system all are 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), the gear supporting section (263) of transition section (262) and some different diameter of axle sizes forms, described thread jaw chuck canned paragraph (261) is fixed in the thread jaw chuck (24) be connected with described gear (23), on the gear supporting section (263) of described each section, be equipped with and screw thread that nut (28) matches, wherein the end-face central hole (264) of the gear supporting section of the minimum diameter of axle coordinates the integrated support location of realizing described multistage mandrel (26) with described top (30), 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) coordinates with X and Y-direction track on described pedestal (1) 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 controlling X and Y-direction guide rail, described digitial controller (11) is regulated the rotating speed of multistage mandrel (26) and turns to by the rotation of controlling described gear (23).
2. the device of a kind of underwater laser shock peening gear pump gear according to claim 1, is characterized in that, also comprises a subsystem; Described subsystem is comprised of flow regulator (9), liquid-storing box (6) and electric pump (5), described flow regulator (9) one ends are 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 ends are 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 aqueous solution in reaction vessel (18) is circulated, described flow regulator (9) is controlled the velocity of flow of the interior aqueous solution of reaction vessel (18).
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) are controlled by computer (10).
4. the method for a underwater laser shock peening gear pump gear comprises following steps:
A. pre-treatment gear workpieces: with dehydrated alcohol, clean the gear workpieces surface, then evenly spraying is pitch-dark at gear surface;
B. the location of gear workpieces clamps: 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 gear supporting section, realize that the location of gear workpieces (22) on multistage mandrel clamps; Withstand with top (30) after the centre hole (264) of multistage end face of mandrel that to shake top handle (29) locking top, shake three and grab chuck handle (25) and realize that the location of multistage mandrel clamps;
C.Regulate digitial controller and control worktable, hoisting appliance and gear, the joint degree that makes laser spot center be positioned at gear workpieces is justified upper, and laser beam is substantially vertical with the tangent line of Involute gear;
D.To injected water solution to the water surface in reaction vessel, exceed gear highest point 20 ~ 40cm, it is 0.6 ~ 1L/s that the adjust flux setter arranges flow, opens electric pump the aqueous solution is circulated;
E.Open the high power laser light generating unit, by the computer installation laser parameter, the 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 the dismounting of the gear workpieces after shock treatment, remove surperficial remaining pitch-dark and with ethanol, that surface cleaning is clean.
5. the method for a kind of underwater laser shock peening gear pump gear according to claim 4, is characterized in that, between described nut (28) and described gear workpieces (22), a pad (27) is set.
6. the method for a kind of underwater laser shock peening gear pump gear according to claim 4, is characterized in that, the pitch-dark thickness in steps A is 0.16 ~ 0.4mm.
7. the method for a kind of underwater laser shock peening gear pump gear according to claim 4, it is characterized in that, the laser-impact process is that laser is strafed to tooth root from tooth top, tooth top is strafed speed 180 ~ 220mm/min, involute urve is strafed speed 110 ~ 160mm/min, gear workpieces (22) rotates a circle and along Y direction, moves after 3mm and continue next all laser-impact and process afterwards, and so circulation is until complete the processing of whole gear mating surface.
8. according to the method for described any one underwater laser shock peening gear pump gear of claim 4-7, it is characterized in that, the laser parameter that the 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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| 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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| CN103233105A (en) * | 2013-05-14 | 2013-08-07 | 江苏大学 | Method and device for strengthening underwater laser micro shot blasting of fastener hole |
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| CN102560079A (en) * | 2012-01-05 | 2012-07-11 | 江苏大学 | Laser shock peening method and device using high-pressure gas as constrained layer |
| CN103233105A (en) * | 2013-05-14 | 2013-08-07 | 江苏大学 | Method and device for strengthening underwater laser micro shot blasting of fastener hole |
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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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