Repair device for contact fatigue damage of tooth surface of gear

Abstract

The invention relates to the technical field of gear tooth surface contact fatigue damage repair, in particular to a gear tooth surface contact fatigue damage repair device which comprises a pulse laser and a universal bamboo joint pipe, and a gear is driven by a driving component to rotate around the axis of the gear; a water outlet nozzle is fixedly arranged at the water outlet end of the universal bamboo joint pipe and provided with a front water outlet capable of discharging flat water flow. The pulse laser device and the universal bamboo joint pipe are driven by the same mechanical arm to move synchronously, so that laser beams emitted by the pulse laser device can form light spots on teeth of the gear, and the front water outlet extends into the position between every two adjacent teeth. The water outlet nozzle comprises a flat pipe, a flat drainage part and an elastic extrusion part. The water restraint layer can better restrain expansion of plasma, formed shock waves can be more effectively spread into the target material, the impact strength borne by the repaired position can be kept basically consistent, and the workpiece repairing effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of repairing contact fatigue damage on gear tooth surfaces, and in particular to a repairing device for contact fatigue damage on gear tooth surfaces. Background Art

[0002] In the prior art, the repair of contact fatigue damage on gear tooth surfaces is generally achieved through laser shock peening technology; laser shock peening essentially uses the ultra-high pressure shock wave induced by a pulsed laser beam to cause the surface of the material to undergo severe plastic deformation in a very short time. Its basic principle is: using high-power, short-pulse lasers to irradiate the metal surface, the absorbing protective layer (aluminum foil, black paint, etc.) coated on the metal surface quickly absorbs the laser energy and undergoes explosive gasification, producing dense high-temperature, high-pressure plasma; the plasma continues to absorb the laser energy and expands violently outward, forming a high-pressure plasma shock wave, which acts on the surface of the material under the constraint of the constraint layer (water, glass, etc.) and propagates inward; when the shock wave pressure exceeds the dynamic yield strength of the material, the material undergoes dynamic plastic deformation, thereby achieving the purpose of repair and strengthening.

[0003] For example, a Chinese invention patent with announcement number CN113523708B discloses a method and a repair device for repairing micro-contact fatigue damage on a tooth surface. The gear to be repaired is fixed on a moving platform by a clamp; the geometric morphological features of the area to be repaired are measured by a three-dimensional topography instrument, and the collected information is input into a comprehensive control and monitoring system. The material and mechanical characteristics of the gear to be repaired are compared through a database to determine the optimal laser shock repair process parameters; the optimal process parameters are introduced into a pulsed laser generator, and the laser generator emits a laser according to the optimal process parameter scheme, and the laser beam is exported through an optical path control system and an optical path system; at the same time, a water constraint layer system controls a water nozzle to form a water constraint layer on the tooth surface; the laser acts on the area to be repaired on the tooth surface, so that the gear produces the required strengthening repair effect, thereby achieving the purpose of repairing the tooth surface damage.

[0004] Although the technical solution provided by the above patent solves the problems of the traditional repair method, such as complex process, large roughness, poor wear resistance and can only be repaired after the gear has obvious defects or failures, it still has the following shortcomings in actual use:

[0005] Since gear teeth have different shapes, directly spraying water onto the position of the tooth to be repaired will form a large amount of water mist due to sputtering, and the thickness of the water confinement layer formed by this method is uneven. The thickness of the water confinement layer has an important influence on the impact intensity of the high-pressure plasma shock wave. The uneven thickness of the water confinement layer will cause the impact intensity of the high-pressure plasma on the workpiece to be inconsistent, resulting in a poor repair effect on the workpiece. Summary of the invention

[0006] The object of the present invention is to provide a repair device for contact fatigue damage of gear tooth surface to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A repair device for contact fatigue damage of gear tooth surface, comprising a pulse laser and a universal bamboo tube, wherein the gear is driven to rotate around its own axis by a driving component;

[0009] A water outlet nozzle is fixedly arranged at the water outlet end of the universal bamboo tube, and the water outlet nozzle has a front water outlet capable of discharging a flat water flow;

[0010] The pulse laser and the universal bamboo tube are driven by the same mechanical arm to move synchronously, so that the laser beam emitted by the pulse laser can form a light spot on the teeth of the gear and the front water outlet extends between two adjacent teeth;

[0011] The water outlet includes a flat tube, a flat drainage part and an elastic extrusion part. Water discharged from the universal bamboo tube enters from one end of the flat tube, and the flat drainage part is slidably inserted from the other end of the flat tube. The front water outlet is arranged on the side of the flat drainage part facing the light spot. The elastic extrusion part is used to limit the relative position between the flat tube and the flat drainage part. The depth of the flat drainage part inserted into the flat tube can be adjusted to change the width of the flat water flow discharged by the front water outlet.

[0012] Preferably, it also includes two air extraction pipes, which are arranged on both sides of the laser beam emitted by the pulse laser;

[0013] Long strip air inlets are provided on two adjacent side surfaces of the two air extraction pipes.

[0014] Preferably, the water outlet further comprises a temporary storage chamber;

[0015] One end of the flat tube is fixedly connected to the temporary storage chamber, and the universal bamboo tube is fixedly connected to the temporary storage chamber;

[0016] The flat tube is arranged on one side of the temporary storage chamber close to the laser beam.

[0017] Preferably, the flat tube comprises a tube body and an inner lining layer fixedly arranged on the inner surface of the tube body;

[0018] The flat drainage part is inserted into the inner lining layer and is sealed and connected with the pipe body through the inner lining layer.

[0019] Preferably, the flat drainage part includes an upper piece and a lower piece arranged in parallel in an upper and lower position, a rear piece fixed to the rear end surfaces of the upper piece and the lower piece, and a right piece fixed to the right ends of the upper piece and the lower piece. The front water outlet is formed between the front ends of the upper piece and the lower piece, and a left water inlet is formed at the left ends of the upper piece and the lower piece.

[0020] Preferably, the elastic extrusion portion includes an extrusion sheet parallel to the upper sheet, an arc-shaped connecting sheet integrally formed and arranged at one end of the extrusion sheet, and a plurality of equally spaced positioning grooves provided on the extrusion sheet;

[0021] A tail piece is fixed to the other end of the extrusion piece, and the distance between the tail piece and the flat tube gradually increases in a direction gradually away from the other end of the extrusion piece;

[0022] A plurality of clamping protrusions are fixed on both the upper and lower side surfaces of the flat tube, and the clamping protrusions are clamped in the inside of the clamping groove.

[0023] Preferably, the two exhaust pipes are fixedly connected to the same concentration chamber, and a connecting nozzle is fixedly connected to the side of the concentration chamber, and the connecting nozzle is connected to the exhaust device through a pipeline;

[0024] The focusing chamber is fixedly connected to the pulse laser through a connecting plate.

[0025] Preferably, the bottom end of the connecting plate is hinged to the centralizing chamber via a damping shaft;

[0026] A fixing block is fixed on the side of the pulse laser, screws are fixed on both sides of the fixing block, and nuts are threadedly sleeved on the screws;

[0027] The connecting plate is fixed on the fixing block by means of nuts.

[0028] Preferably, a strip hole is opened on the connecting plate, and the screw rod passes through the strip hole and is threadedly connected with the nut.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention controls the gear to rotate around its own axis on the one hand, and uses a mechanical arm to drive the pulse laser and the universal bamboo tube to move together on the other hand, so that the water discharged by the universal bamboo tube can accurately flow to the position of the light spot; then the flat water flow discharged from the front water outlet is used as a water constraint layer for repairing the tooth surface damage position, ensuring that the thickness of the water constraint layer at the light spot position remains basically consistent, and completing the controllable setting of the thickness of the water constraint layer, so that the water constraint layer can better constrain the expansion of plasma, and the formed shock wave can be more effectively propagated into the target material, which is conducive to keeping the impact intensity borne by the repair position basically consistent, and the repair effect on the workpiece is good; and the width of the flat water flow discharged from the front water outlet is adjustable, which expands the application range of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the universal bamboo tube and the water outlet of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the water outlet of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the flat tube, the flat drainage part and the elastic extrusion part of the present invention;

[0035] Figure 5 It is a structural schematic diagram of the flat drainage part of the present invention;

[0036] Figure 6 It is a structural schematic diagram of the air extraction pipe and the connecting plate of the present invention;

[0037] Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle;

[0038] Figure 8 For the present invention Figure 6 Schematic diagram of the local structure.

[0039] In the figure: 1. pulse laser; 2. universal bamboo tube; 3. water outlet; 31. temporary storage chamber; 32. flat tube; 321. tube body; 322. lining layer; 323. positioning protrusion; 33. flat drainage part; 331. upper piece; 332. lower piece; 333. right piece; 334. rear piece; 335. front water outlet; 336. left water inlet; 34. elastic extrusion part; 341. extrusion piece; 342. arc-shaped connecting piece; 343. positioning groove; 344. tail piece; 4. gear; 41. teeth; 5. exhaust pipe; 51. air inlet; 52. concentration chamber; 53. connecting nozzle; 6. connecting plate; 61. strip hole; 62. damping shaft; 7. fixing block; 71. screw; 8. nut. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 8 , the present invention provides a technical solution:

[0042] A repair device for gear tooth surface contact fatigue damage comprises a pulse laser 1 and a universal bamboo tube 2; the repair method of the present invention is to use laser shock peening technology to repair the position of the gear tooth surface contact fatigue damage, wherein the pulse laser 1 is used to form a pulse laser beam (or laser beam), and the universal bamboo tube 2 is a water outlet structure of a water constraint system, and its function is to generate a water constraint layer at the light spot position: the above-mentioned are all existing technologies and will not be repeated here.

[0043] The improvements of the technical solution of the present invention over the prior art are introduced below.

[0044] The repaired workpiece in the present invention, i.e., the gear 4, is driven to rotate around its own axis by a driving component (the driving component is not shown in the figure); specifically, the driving component can be a combination of a stepper motor and a clamp, the stepper motor is fixedly arranged, and the clamp is installed on the motor shaft of the stepper motor. The specific model or specific structure of the stepper motor and the clamp is not specifically limited here. The stepper motor only needs to be able to drive the gear 4 to rotate around its own axis. Similarly, the clamp only needs to be able to be used to clamp the gear 4. In some embodiments, for example, Figure 1 In the state shown, the axis of the gear 4 is horizontal, and the pulse laser 1 is kept in a certain tilted state, so as to ensure that the laser beam generated by the pulse laser 1 can be smoothly irradiated on the tooth surface of the tooth 41 of the gear 4.

[0045] like Figure 2 and Figure 3 As shown, the water outlet end of the universal bamboo tube 2 is fixedly provided with a water outlet nozzle 3, and the water outlet nozzle 3 has a front water outlet 335 that can discharge a flat water flow; as can be seen from the figure, the water outlet nozzle 3 is arranged at the water outlet ends of the two universal bamboo tubes 2, and the universally adjustable characteristics of the universal bamboo tube 2 are utilized, so that the staff can adjust the position and inclination angle of the front water outlet 335 according to the actual situation, so that the flat water flow discharged from the front water outlet 335 will fall on the tooth surface of the tooth 41 of the gear 4, thereby forming a flat water flow as a water constraint layer at the position to be repaired of the tooth surface of the tooth 41, compared with the traditional method of directly injecting the water discharged from the universal bamboo tube 2 onto the tooth surface of the tooth 41 to form a water constraint layer The water confinement layer in the present technical solution is a flat water flow, and because the water confinement layer is discharged through the flat front water outlet 335, it is flat in the initial stage, so the thickness of the entire water confinement layer can be basically kept consistent, and the water confinement layer can better constrain the expansion of the plasma, so that the shock wave can more effectively propagate into the target material; further, the two universal bamboo tubes 2 have a strong constraining ability, so that the position of the front water outlet 335 can be positioned at a suitable position without positional displacement due to the recoil of the flat water flow, and the thickness of the entire front water outlet 335 can meet the requirement of extending between two adjacent teeth 41 of different gears 4.

[0046] The pulse laser 1 and the universal bamboo tube 2 are driven by the same robotic arm (the robotic arm is not shown in the figure) to move synchronously. The specific model of the robotic arm is not specifically limited here. Its function is to drive the pulse laser 1 and the universal bamboo tube 2 to move to a suitable state, so that the laser beam emitted by the pulse laser 1 can form a light spot on the teeth 41 of the gear 4, and the front water outlet 335 extends between two adjacent teeth 41.

[0047] The water outlet 3 includes a flat tube 32, a flat drainage part 33 and an elastic extrusion part 34, wherein the water discharged from the universal bamboo tube 2 enters from one end of the flat tube 32, and the flat drainage part 33 is slidably inserted from the other end of the flat tube 32, and the front water outlet 335 is arranged on the side of the flat drainage part 33 facing the light spot, and the elastic extrusion part 34 is used to limit the relative position between the flat tube 32 and the flat drainage part 33; the depth of the flat drainage part 33 inserted into the flat tube 32 can be adjusted to change the width of the flat water flow discharged by the front water outlet 335; specifically, as shown in FIG. Figure 3-Figure 5 As shown, the position of the flat tube 32 remains fixed, and the flat drainage portion 33 can slide relative to the flat tube 32, thereby achieving the purpose of adjusting the width of the flat water flow discharged by the front water outlet 335.

[0048] In the above scheme, on the one hand, the gear 4 is controlled to rotate around its own axis, and on the other hand, the mechanical arm is used to drive the pulse laser 1 and the universal bamboo tube 2 to move together, so that the water discharged by the universal bamboo tube 2 can accurately flow to the position of the light spot; then the flat water flow discharged from the front water outlet 335 is used as a water constraint layer for repairing the damaged position of the tooth surface, ensuring that the thickness of the water constraint layer at the light spot position remains basically consistent, completing the controllable setting of the thickness of the water constraint layer, so that the water constraint layer can better constrain the expansion of the plasma, and the formed shock wave can be more effectively propagated into the target material, which is conducive to keeping the impact intensity of the repair position basically consistent; and the width of the flat water flow discharged from the front water outlet 335 is adjustable, which expands the scope of application of the entire device.

[0049] The water outlet 3 also includes a temporary storage chamber 31; one end of the flat tube 32 is fixedly connected to the temporary storage chamber 31, the universal bamboo tube 2 is fixedly connected to the temporary storage chamber 31, and the flat tube 32 is arranged on the side of the temporary storage chamber 31 close to the laser beam; the universal bamboo tube 2 transports water to the interior of the temporary storage chamber 31, and then discharges it through the front water outlet 335 of the water outlet 3 after stabilizing the pressure, so that the stability of the flat water flow discharged from the front water outlet 335 is significantly improved, preventing the thickness of the flat water flow from fluctuating due to changes in water pressure.

[0050] The flat tube 32 includes a tube body 321 and an inner lining layer 322 fixedly arranged on the inner surface of the tube body 321. The flat drainage portion 33 is inserted into the inner lining layer 322 and is sealed to the tube body 321 through the inner lining layer 322. The inner lining layer 322 can be made of rubber or silicone material, which helps to prevent water from leaking from the gap between the flat drainage portion 33 and the flat tube 32.

[0051] The flat drainage portion 33 can be made of stainless steel as a whole. Figure 3-Figure 5 As shown, the flat drainage portion 33 includes an upper piece 331 and a lower piece 332 which are arranged in parallel in the upper and lower positions, a rear piece 334 fixed to the rear end surfaces of the upper piece 331 and the lower piece 332, and a right piece 333 fixed to the right ends of the upper piece 331 and the lower piece 332. A front water outlet 335 is formed between the front ends of the upper piece 331 and the lower piece 332, and a left water inlet 336 is formed at the left ends of the upper piece 331 and the lower piece 332; water flows into between the upper piece 331 and the lower piece 332 from the left water inlet 336, and then is discharged from the front water outlet 335, and the width of the front water outlet 335 changes according to the depth of its insertion into the flat tube 32.

[0052] The elastic extrusion portion 34 includes an extrusion piece 341 parallel to the upper piece 331, an arc-shaped connecting piece 342 integrally formed at one end of the extrusion piece 341, and a plurality of equally spaced positioning grooves 343 provided on the extrusion piece 341; a tail piece 344 is fixed to the other end of the extrusion piece 341, and the distance between the tail piece 344 and the flat tube 32 gradually increases in the direction gradually away from the other end of the extrusion piece 341. The function of the tail piece 344 is that when the flat drainage portion 33 is pushed gradually into the interior of the flat tube 32, the tail piece 344 can guide the other end of the extrusion piece 341 to gradually move away from the flat tube 32; a plurality of positioning protrusions 323 are fixed to the upper and lower side surfaces of the flat tube 32, and the positioning protrusions 323 are engaged in the interior of the positioning grooves 343; the positioning protrusions 323 and the positioning grooves 343 cooperate to facilitate the adjustment of the depth of the flat drainage portion 33 inserted into the interior of the flat tube 32, and to prevent the flat drainage portion 33 from falling out of the flat tube 32 under the impact of the water flow.

[0053] The repair device for contact fatigue damage of gear tooth surface of the present invention also includes two exhaust pipes 5, which are arranged on both sides of the laser beam emitted by the pulse laser 1; long strip-shaped air inlets 51 are provided on the two adjacent sides of the two exhaust pipes 5; the two exhaust pipes 5 are fixedly connected to the same focusing chamber 52, and the side of the focusing chamber 52 is fixedly connected with a connecting nozzle 53, and the connecting nozzle 53 is connected to the exhaust device through a pipeline. The specific model of the exhaust device is not limited here. The function of the exhaust device is to form a suction force at the air inlet 51, so as to absorb the water mist generated by the water confinement layer when the plasma expands violently, prevent excessive water mist from scattering or absorbing part of the laser energy, which is beneficial to ensure the consistency of laser energy and then achieve consistency of impact strength; the focusing chamber 52 is fixedly connected to the pulse laser 1 through the connecting plate 6; the exhaust pipe 5 is a positioning circular tube, and its end away from the focusing chamber 52 is sealed.

[0054] The bottom end of the connecting plate 6 is hinged to the focusing chamber 52 through a damping shaft 62. The function of the damping shaft 62 is to enable the staff to adjust the position of the exhaust pipe 5 according to actual needs, or to adjust the angle between the exhaust pipe 5 and the connecting plate 6; a fixing block 7 is fixed to the side of the pulse laser 1, and screws 71 are fixed on both sides of the fixing block 7, and nuts 8 are threadedly sleeved on the screws 71; the connecting plate 6 is pressed and fixed on the fixing block 7 by the nuts 8; a strip hole 61 is opened on the connecting plate 6, and the screw 71 passes through the strip hole 61 and is threadedly connected to the nut 8. The setting of the strip hole 61 allows the staff to adjust the distance between the exhaust pipe 5 and the pulse laser 1 according to actual needs.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A repair device for contact fatigue damage on gear tooth surface, comprising a pulse laser and a universal bamboo tube, characterized in that: The gear is driven to rotate around its own axis by the driving component; A water outlet nozzle is fixedly arranged at the water outlet end of the universal bamboo tube, and the water outlet nozzle has a front water outlet capable of discharging a flat water flow; The pulse laser and the universal bamboo tube are driven by the same mechanical arm to move synchronously, so that the laser beam emitted by the pulse laser can form a light spot on the teeth of the gear and the front water outlet extends between two adjacent teeth; The water outlet includes a flat tube, a flat drainage part and an elastic extrusion part. Water discharged from the universal bamboo tube enters from one end of the flat tube, and the flat drainage part is slidably inserted from the other end of the flat tube. The front water outlet is arranged on the side of the flat drainage part facing the light spot. The elastic extrusion part is used to limit the relative position between the flat tube and the flat drainage part. The depth of the flat drainage part inserted into the flat tube can be adjusted to change the width of the flat water flow discharged by the front water outlet.

2. A repair device for contact fatigue damage on gear tooth surface according to claim 1, characterized in that: It also includes two air extraction pipes, which are arranged on both sides of the laser beam emitted by the pulse laser; Long strip air inlets are provided on two adjacent side surfaces of the two air extraction pipes.

3. The repair device for contact fatigue damage of gear tooth surface according to claim 1, characterized in that: The water outlet also includes a temporary storage chamber; One end of the flat tube is fixedly connected to the temporary storage chamber, and the universal bamboo tube is fixedly connected to the temporary storage chamber; The flat tube is arranged on one side of the temporary storage chamber close to the laser beam.

4. The repair device for gear tooth surface contact fatigue damage according to claim 1, characterized in that: The flat tube includes a tube body and an inner lining layer fixedly arranged on the inner surface of the tube body; The flat drainage part is inserted into the inner lining layer and is sealed and connected with the pipe body through the inner lining layer.

5. The repair device for contact fatigue damage of gear tooth surface according to claim 1, characterized in that: The flat drainage part includes an upper piece and a lower piece arranged in parallel in an upper and lower position, a rear piece fixed to the rear end surfaces of the upper piece and the lower piece, and a right piece fixed to the right ends of the upper piece and the lower piece. A front water outlet is formed between the front ends of the upper piece and the lower piece, and a left water inlet is formed at the left ends of the upper piece and the lower piece.

6. The repair device for contact fatigue damage of gear tooth surface according to claim 1, characterized in that: The elastic extrusion part includes an extrusion sheet parallel to the upper sheet, an arc-shaped connecting sheet integrally formed and arranged at one end of the extrusion sheet, and a plurality of equally spaced positioning grooves provided on the extrusion sheet; A tail piece is fixed to the other end of the extrusion piece, and the distance between the tail piece and the flat tube gradually increases in a direction away from the other end of the extrusion piece. A plurality of clamping protrusions are fixed on both upper and lower side surfaces of the flat tube, and the clamping protrusions are clamped in the inside of the clamping grooves.

7. The repair device for contact fatigue damage of gear tooth surface according to claim 2, characterized in that: The two exhaust pipes are fixedly connected to the same concentration chamber, and a connecting nozzle is fixedly connected to the side of the concentration chamber, and the connecting nozzle is connected to the exhaust equipment through a pipeline; The focusing chamber is fixedly connected to the pulse laser through a connecting plate.

8. The repair device for contact fatigue damage of gear tooth surface according to claim 7, characterized in that: The bottom end of the connecting plate is hinged to the centralizing chamber through a damping shaft; A fixing block is fixed on the side of the pulse laser, screws are fixed on both sides of the fixing block, and nuts are threadedly sleeved on the screws; The connecting plate is fixed on the fixing block by means of nuts.

9. A repair device for contact fatigue damage on gear tooth surface according to claim 8, characterized in that: The connecting plate is provided with a strip hole, and the screw rod passes through the strip hole and is threadedly connected with the nut.

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