CN112337703B - Laser shock strengthening restraining water device and implementation method thereof - Google Patents

Abstract

The invention belongs to the technical field of surface treatment of parts, and relates to a laser shock strengthening device for confining water and an implementation method thereof; comprising a nozzle (1), a flexible pipe (2), a control valve (3), a water pump (4), a water storage bucket ( 5) and a water purifier (6); the nozzle (1) is composed of a pipe body (9) and a nozzle (10), the nozzle moves synchronously with the parts, and sprays water flow on the surface of the parts in situ to form a stable and uniform The confinement water film is not required for the nozzle to be clamped by an additional robot, which reduces the complexity of the equipment; before each laser pulse is emitted, the pause of the robot can improve the stability of the confinement water film and improve the quality of laser shock strengthening; the nozzle and the The water pumps are connected by flexible pipes to ensure that the robot holding the parts has a good degree of freedom of movement.

Description

A laser shock strengthening device for restraining water and its implementation method

technical field

The invention belongs to the technical field of surface treatment of parts, and relates to a laser shock strengthening device for confining water and an implementation method thereof.

Background technique

With the development of the aviation industry, the performance of the aircraft has gradually improved. In terms of structural design, more and more key parts of aircraft are made of integral structure, which is expected to achieve the dual purpose of weight reduction and high reliability. However, the overall structure usually has some curved surfaces, narrow cavities, grooves and other structures. During the processing, problems such as structural interference and processing difficulties are prone to occur, which affect the processing quality of the parts.

Laser shock strengthening is a new type of surface strengthening technology, which uses laser-induced plasma shock waves to plastically deform the surface of the material to form a residual compressive stress layer and a structural strengthening layer, thereby improving the overall fatigue performance of the parts. During the implementation of the process, a confining water film must be formed on the surface of the part, and the surface tension of the water is used to constrain the force direction of the laser-induced plasma shock wave and increase the amplitude and time of the force. Therefore, the water film must be spread evenly On the surface of the part, the thickness is uniform and the flow rate is stable. At present, there are two main ways of spreading the water film on the parts: one is that the nozzle is fixed; the other is that the nozzle is gripped and moved by a robot. In the above two methods, the nozzle is not in contact with the part, and the water jet formed by the nozzle sputters onto the surface of the part, and flows along the surface of the part under the action of gravity, thereby forming a confining water film. The first method is suitable for simple planes and can obtain better water film quality. However, for curved surfaces, narrow cavities or semi-closed grooves, etc., the water jet generated by the nozzle is affected by structural interference, which is prone to water plugging or The phenomenon that the water jet is blocked makes it difficult to form a stable and uniform water film on the surface of the part. The second method has better structural applicability, not only for simple planes, but also for curved surfaces, narrow cavities or semi-closed grooves, etc. However, two robots are required to clamp the parts and the nozzle respectively. , which not only increases the cost of equipment, but also increases the complexity of process programming.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a laser shock strengthening device for confining water and an implementation method thereof, which can solve the problems of unstable and uneven confinement water film of complex structures such as curved surfaces, narrow inner cavities or semi-closed grooves without additional robots , improve the quality of the confined water film and meet the needs of large-scale production.

The technical scheme of the present invention is:

A laser shock strengthening device for restraining water is characterized in that: the device is composed of a nozzle 1, a flexible pipe 2, a control valve 3, a water pump 4, a water storage bucket 5 and a water purifier 6; the right end of the nozzle 1 is connected to the flexible pipe 2 The left ends of the nozzles are connected, and the nozzle 1 is fixed on the surface of the part 8; there are multiple nozzles on the nozzle 1, the nozzles are 5-20mm away from the red light indicating spot of the area _to be strengthened, and the nozzle is located upstream of the area to be strengthened; the part 8 is controlled by the robot 7 Clamp and realize movement; the flexible pipe 2, the water pump 4, the water storage bucket 5, and the water purifier 6 are connected in sequence.

The nozzle 1 is composed of a pipe body 9 and a nozzle 10. The cross-section of the pipe body 9 is a rectangle, and there is a cavity inside the pipe body 9. The right side of the pipe body 9 has a water inlet, and the left side is a closed blind end; There are multiple spouts 10 on the front of the body.

The number of the nozzles 10 is b, the distance between two adjacent nozzles 10 is h, and the water flow rate of the nozzles 10 is e; the relationship between the nozzle parameters is as follows:

Table 1 Interrelationship between nozzle parameters

Note: The total water flow is 0.1m ³ /min～3m ³ /min, the water pressure is 0.1MPa～2MPa, 100≥b≥4.

The distance h between two adjacent nozzles 10 is 1˜30 mm.

The shape of the nozzle 10 is a circle, an ellipse, a square or a rectangle, and the area S is 0.01-25 mm ² .

The height c from the center of the spout 10 to the bottom plane of the pipe body 9 is 0.1-10 mm.

The angle θ between the water jet direction of the nozzle 10 and the bottom plane of the pipe body 9 is 0° to 75°

The cross section of the flexible tube 2 is annular, the wall thickness is 0.5mm-1mm, and the outer diameter is Φ5mm-Φ10mm.

A method for implementing a laser shock strengthening device for confining water, characterized in that:

1) Fix the part 8 on the robot 7 through the fixture;

2) Fix the nozzle 1 on the surface of the part 8, and ensure that the angle θ between the normal of the area to be strengthened on the surface of the part 8 and the ground is +90°～-45° by adjusting the robot 7;

3) Adjust the water flow by 0.1m ³ /min～3m ³ /min through the control valve 3, and adjust the water pump 4 to ensure that the pressure is kept at 0.1MPa～2MPa;

4) After the water flow of the nozzle of the nozzle 1 is stabilized, the robot 7 is turned on, the movement of the part 8 is realized by the movement of the robot 7, and a laser pulse is emitted at each point to be strengthened to realize the laser shock strengthening of the point to be strengthened;

5) After the robot movement path is completed, turn off the laser, remove the nozzle 1, and remove the part 8.

The movement speed of the flange plate of the robot 7 is 50mm/s～300mm/s, and pauses for 0.3s～2s at each point to be strengthened.

The advantages of the present invention are:

First, the spout moves synchronously with the part, and sprays water in-situ on the surface of the part to form a stable and uniform confinement water film. The spout does not require additional robot clamping, reducing the complexity of the equipment.

Second, before each laser pulse is emitted, the pause of the robot can improve the stability of the confined water film and improve the quality of laser shock strengthening.

Third, the nozzle and the water pump are connected by a flexible pipe to ensure that the robot holding the parts has a good degree of freedom of movement.

Description of drawings

Fig. 1 Schematic diagram of the water restraint device of the present invention

Fig. 2 is the front view of the nozzle 1 of the present invention

FIG. 3 is a sectional view of the nozzle 1 of the present invention at the nozzle 10

Detailed ways

A laser shock strengthening device for restraining water, the device is composed of a nozzle 1, a flexible pipe 2, a control valve 3, a water pump 4, a water storage bucket 5 and a water purifier 6; the right end of the nozzle 1 is communicated with the left end of the flexible pipe 2 , there are multiple nozzles on the nozzle 1, and it has a certain flexibility, which can be pasted and fixed on the surface of the part 8 through suction cups, double _- sided tape or glue; The spout is located upstream of the area to be strengthened; the part 8 is gripped and moved by the robot 7; the right end of the flexible pipe 2 is connected to the left end of the water pump 4, and the water flow can be adjusted by the control valve 3; the right end of the water pump 4 is connected to the water storage bucket The water outlet of 5 is connected, and the water flow can be adjusted through the valve; the water inlet of the water storage bucket 5 is connected with the water outlet of the water purifier 6, and the water flow can be adjusted through the valve; the water inlet of the water purifier 6 is connected to the The water pipes are connected.

The nozzle 1 is composed of a pipe body 9 and a nozzle 10. The cross-section of the pipe body 9 is rectangular, and there is a cavity inside the pipe body 9. The right side of the pipe body 9 has a water inlet, and the left side is a closed blind end; There are a plurality of nozzles 10 on the front of 9, the number of the nozzles 10 is b, the distance between two adjacent nozzles 10 is h, and the water flow rate of the nozzles 10 is e; the relationship between the nozzle parameters is as follows:

Table 1 Interrelationship between nozzle parameters

Note: The total water flow is 0.1m ³ /min～3m ³ /min, the water pressure is 0.1MPa～2MPa, 100≥b≥4.

The material of the nozzle 1 is one of polyvinyl chloride, polyurethane, polyurethane, polyamide, EPDM, oil-filled styrene-butadiene rubber, natural rubber, and synthetic rubber; the length L of the pipe body 9 is 10-1000mm, height M is 1-30mm, width N is 1-30mm, and the wall thickness of the tube body 9 is 1-5mm; generally, a method of calendering, extrusion molding, compression molding, and additive manufacturing is used. preparation.

The shape of the spout 10 is a circle, an ellipse, a square or a rectangle, and the area S is 0.01-25 mm ² ; the distance h between two adjacent spouts 10 is 1-30 mm; the spout 10 adopts the method of laser drilling preparation. The angle θ between the water jet direction of the nozzle 10 and the bottom plane of the pipe body 9 is 0°-75°; the height c from the center of the nozzle 10 to the bottom plane of the pipe body 9 is 0.1-10 mm.

The flexible tube 2 is made of polyvinyl chloride, polyurethane, polyurethane, polyamide, EPDM, oil-filled styrene-butadiene rubber, natural rubber, and synthetic rubber. The cross section of the flexible tube 2 is annular, the wall thickness is 0.5mm-1mm, and the outer diameter is Φ5mm-Φ10mm. The length of the flexible pipe 2 should ensure that the flexible pipe 2 will not be pulled or broken within the movement range of the robot.

The method for implementing a laser shock-strengthening device for confining water according to claim 1, wherein:

1) Fix the part 8 on the robot 7 through the fixture;

2) According to the position and shape characteristics of the area to be strengthened, fix the nozzle 1 on the surface of the part 8, and adjust the robot 7 to ensure that the angle θ between the normal of the area to be strengthened on the surface of the part 8 and the ground is +90°～-45° ;

3) Adjust the water flow through valve 4 to 0.1m ³ /min～3m ³ /min, and adjust the water pump to ensure that the pressure is kept at 0.1MPa～2MPa;

4) After the water flow of the nozzle of the nozzle 1 is stable, the robot 7 is turned on, and the movement of the part 8 is realized by the movement of the robot 7. The movement speed of the flange of the robot 7 is 50mm/s～300mm/s. After the strengthening point pauses for 0.3s to 2s, the laser pulse is emitted to realize the laser shock strengthening of the strengthening point;

5) After the robot movement path is completed, turn off the laser, remove the nozzle 1, and remove the part 8.

The working principle of the present invention is:

The invention proposes a way of constraining the spreading of the water film. The nozzle is directly fixed near the area to be strengthened on the surface of the part, and the nozzle moves together with the part. Only one robot is needed to clamp the part, and the robot does not need to be clamped by the nozzle. The number of robots is reduced, the cost is reduced, and the difficulty of robot programming is also reduced.

In addition, the nozzle has a certain flexibility and is composed of multiple nozzles, which can be bent according to the shape of the area to be strengthened, and fixed by suction cups, double-sided tape or glue, so as to form a large area, stable and stable on the surface of the part to be strengthened. Uniform confinement water film.

Third, the pausing of the robot before each laser pulse can improve the stability of the confined water film and improve the quality of laser shock strengthening.

Fourth, the nozzle and the water pump are connected by a flexible pipe to ensure that the robot holding the parts has a good degree of freedom of movement.

Example 1

A laser shock strengthening device for restraining water, the device is composed of a nozzle 1, a flexible pipe 2, a control valve 3, a water pump 4, a water storage bucket 5 and a water purifier 6; the right end of the nozzle 1 is communicated with the left end of the flexible pipe 2 , there are 10 nozzles on the nozzle 1, and it has a certain flexibility, which can be fixed on the surface of the part 8 by double-sided tape; the nozzle of nozzle 1 is 5mm away from the red light indicating spot in the area to be strengthened, and the nozzle is located in the area to be strengthened. The part 8 is clamped and moved by the robot 7; the right end of the flexible pipe 2 is connected with the left end of the water pump 4, and the water flow can be adjusted by the control valve 3; the right end of the water pump 4 is connected with the water outlet of the water storage bucket 5. The water flow can be adjusted through the valve; the water inlet of the water storage bucket 5 is connected with the water outlet of the water purifier 6, and the water flow can be adjusted through the valve; the water inlet of the water purifier 6 is connected with the water pipe.

The method for implementing a laser shock-strengthening device for confining water according to claim 1, wherein:

1) Fix the part 8 on the robot 7 through the fixture;

2) According to the position and shape characteristics of the area to be strengthened, the nozzle 1 is fixed on the surface of the part 8, and the angle θ between the normal of the area to be strengthened on the surface of the part 8 and the ground is +90° by adjusting the robot 7;

3) Adjust the water flow through valve 4 to 0.1m ³ /min, and adjust the water pump to ensure that the pressure is maintained at 0.1MPa;

4) After the water flow of the nozzle of the nozzle 1 is stable, the robot 7 is turned on, and the movement of the part 8 is realized by the movement of the robot 7. The movement speed of the flange plate of the robot 7 is 50mm/s, and it pauses at every point to be strengthened. After 0.3s, laser pulses are emitted to achieve laser shock strengthening of the points to be strengthened;

5) After the robot movement path is completed, turn off the laser, remove the nozzle 1, and remove the part 8.

The material of the flexible pipe is polyvinyl chloride, the cross section is annular, the wall thickness is 1mm, and the outer diameter is Φ10mm. The maximum moving distance of the area to be strengthened is 0.5m, and the length of the flexible pipe 2 is 1m.

Example 2

Adjust the water pump to ensure that the pressure is kept at 2MPa, the material of the flexible pipe 2 is polyvinyl chloride, the movement speed of the flange plate of the robot 7 is 300mm/s, and it pauses for 2s at each point to be strengthened.

Claims (10)

1. A laser shock peening restraint water installation which characterized in that: comprises a spray pipe (1), a flexible pipe (2), a control valve (3), a water pump (4), a water storage barrel (5) and a water purifier (6); the right end of the spray pipe (1) is communicated with the left end of the flexible pipe (2), and the spray pipe (1) is fixed on the surface of the part (8) through a sucker, a double-sided adhesive tape or glue; the spray pipe (1) is provided with a plurality of nozzles which can be bent according to the shape of the area to be strengthened; the distance between the nozzle and the red light indication spot of the area to be strengthened is 5-20 mm, and the nozzle is positioned at the upstream of the area to be strengthened; the part (8) is clamped by the robot (7) and moves; the flexible pipe (2), the water pump (4), the water storage barrel (5) and the water purifier (6) are connected in sequence.

2. The laser shock peening confining water device as recited in claim 1, wherein: the spray pipe (1) consists of a pipe body (9) and a spray opening (10), the section of the pipe body (9) is rectangular, a cavity is formed in the pipe body (9), a water inlet is formed in the right side of the pipe body (9), and a closed blind end is formed in the left side of the pipe body; the front of the tube body is provided with a plurality of nozzles (10).

3. The laser shock peening confining water device as recited in claim 2, wherein: the number of the nozzles (10) is b, the distance between every two adjacent nozzles (10) is h, and the water flow of the nozzles (10) is e; the correlation between nozzle parameters is as follows:

TABLE 1 correlation between nozzle parameters

Note: total water flow 0.1m ³ /min～3m ³ Min, the water pressure is 0.1MPa to 2MPa, and b is more than or equal to 100 and more than or equal to 4.

4. The laser shock peening confining water device as recited in claim 2, wherein: the distance h between two adjacent nozzles (10) is 1-30 mm.

5. The laser shock peening confining water device as recited in claim 2, wherein: the shape of the nozzle (10) is circular, oval, square or rectangular, and the area S is 0.01-25 mm ² 。

6. The laser shock peening confining water device as recited in claim 2, wherein: the height c between the center of the nozzle (10) and the bottom plane of the pipe body (9) is 0.1-10 mm.

7. The laser shock peening confining water device as recited in claim 2, wherein: the included angle theta between the water jet direction of the nozzle (10) and the bottom plane of the pipe body (9) is 0-75 degrees.

8. The laser shock peening confining water device as recited in claim 1, wherein: the cross section of the flexible pipe (2) is annular, the wall thickness is 0.5 mm-1 mm, and the outer diameter is phi 5 mm-phi 10 mm.

9. The method for implementing the laser shock peening water confining device as claimed in any one of claims 1 to 8, wherein:

1) fixing the part (8) on the robot (7) through a clamp;

2) fixing the spray pipe (1) on the surface of the part (8), and ensuring that the included angle theta between the normal of the area to be strengthened on the surface of the part (8) and the ground is +90 degrees to-45 degrees by adjusting the robot (7);

3) the water flow is adjusted to be 0.1m by the control valve (3) ³ /min～3m ³ Min, adjusting a water pump (4) to ensure that the pressure is kept between 0.1MPa and 2 MPa;

4) after the water flow of a nozzle of the spray pipe (1) is stable, starting the robot (7), moving the part (8) through the movement of the robot (7), and emitting laser pulses at each 1 point to be strengthened to realize laser shock strengthening of the point to be strengthened;

5) and after the movement path of the robot is finished, the laser is turned off, the spray pipe (1) is detached, and the part (8) is taken down.

10. The method for implementing the laser shock peening water restraining device of claim 9, wherein: the movement speed of a flange plate of the robot (7) is 50-300 mm/s, and the movement stops for 0.3-2 s at each 1 point to be strengthened.

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