A laser shot peening device suitable for plate-shaped specimens

Abstract

A laser shot peening strengthening device suitable for plate-shaped samples comprises a power device, a transmission device, a lens group device and a box device arranged in sequence in the transverse direction; the power device comprises a motor, the motor transmission connection gear is connected to a support platform through a longitudinal rack, and the motor is used to drive the gear to rotate so that the support platform reciprocates along the longitudinal rack; the transmission device comprises a support platform, and the lens group device is arranged on the support platform; the lens group device comprises a laser transmitter, and the laser beam emitted by the laser transmitter enters the box device through the lens group; the box device comprises a protective box, and a reflector is arranged in the protective box, and the sample is located on the path of the laser beam reflected by the reflector. The present invention is easy to implement in the laboratory, simple to operate, and less affected by environmental factors.

Description

Technical Field

[0001] The invention relates to the field of material surface modification experimental devices, in particular to a laser shot peening strengthening device suitable for plate-shaped samples. Background Art

[0002] With the continuous development of military devices, aerospace, automobiles and other fields, the performance of metal materials has become a research hotspot. Under some special conditions, alloy materials are required to be able to serve in high temperature environments and have good high temperature strength, fatigue resistance and creep properties. However, most metal components currently often produce fatigue cracks on the surface in complex service environments for a long time, causing parts failure. In order to improve the service life of structural parts in service environments and increase the reliability of materials, surface modification technology has been increasingly studied.

[0003] Among them, laser shot peening, as a new surface modification technology, can significantly improve the fatigue strength of components and has attracted the attention of many researchers. Compared with traditional surface strengthening technology, laser shock wave strengthening has the characteristics of good strengthening effect, strong controllability, and strong processing performance for parts with complex shapes. It uses the plasma shock wave generated by a strong laser beam to act on the metal surface and propagate inward, causing strain hardening on the surface of the material and residual high-amplitude compressive stress field, thereby significantly improving the material's microhardness, fatigue strength and other properties.

[0004] In order to be able to use laser shot peening technology more widely to improve the performance of materials, inventing a device that can perform laser shot peening efficiently and safely is the research direction of many researchers. Most of the current experimental devices have the disadvantages of difficult control of the shot peening area, no protective device during the experimental impact process, and high cost. In addition, there are few studies on experimental devices for plate-shaped specimens. In view of the problems existing in the existing methods, the device of the present invention can achieve comprehensive control of the shot peening area. The shot peening process is completed in a protective box, and the degree of processing can be observed through a glass window, which is economical. Summary of the invention

[0005] In order to overcome the above problems, the present invention provides a laser shot peening strengthening device suitable for plate-shaped samples, which is simple to operate and less affected by environmental factors.

[0006] The technical solution adopted by the present invention is: a laser shot peening strengthening device suitable for plate-shaped samples, comprising a power device, a transmission device, a lens group device and a box device arranged in sequence along the transverse direction;

[0007] The power device includes a motor 21, the output shaft of the motor 21 is connected to the input shaft of the small pulley 20, the small pulley 20 is connected to the large pulley 17 through the belt 19, the output shaft of the large pulley 17 is connected to the left end of the shaft 18, the bearing support 15 supports the shaft 18 through the bearing 16, the right end of the shaft 18 is connected to the input shaft of the gear 14, and the gear 14 is connected to the support platform 13 through the longitudinal rack arranged on the bottom surface of the support platform 13; the motor 21 is used to drive the gear 14 to rotate so that the support platform 13 reciprocates along the longitudinal rack; the motor 21 is electrically connected to the motor controller 22;

[0008] The transmission device includes a support platform 13, which is in the shape of a horizontally arranged flat plate, and a longitudinal rack and a longitudinal guide groove are arranged in parallel on the bottom surface of the support platform 13, and the longitudinal rack is located on the left side of the longitudinal guide groove; the support platform 13 is installed on the guide rail 12 through the longitudinal guide groove, and can slide back and forth on the guide rail 12; the guide rail 12 is arranged on the top of the guide rail support 25, and the length of the guide rail 12 is the same as the length of the longitudinal rack; a lens device is installed on the support platform 13;

[0009] The lens device includes a laser emitter 27, a first concave lens 6, a first convex lens 7, a second concave lens 8, a second convex lens 9, a third concave lens 10 and a third convex lens 11; the third convex lens 11, the third concave lens 10, the second convex lens 9, the second concave lens 8, the first convex lens 7 and the first concave lens 6 are arranged in sequence according to the direction of the laser beam emitted by the laser emitter 27, and their axes are all located on the optical axis of the laser beam; the laser emitter 27 is electrically connected to the laser emitter controller 23, and the laser emitter controller 23 is electrically connected to the computer 24;

[0010] The direction of the laser beam emitted by the laser emitter 27 is defined as the horizontal direction, and the direction perpendicular to the horizontal direction is defined as the vertical direction;

[0011] The box device includes a reflector 26 and a sample 28 arranged in a protective box 1; the protective box 1 is a hollow rectangular box, and an incident window is provided at the left end of the rectangular box for the laser beam to enter the interior of the protective box 1, the incident window is parallel to the longitudinal rack, and the length of the incident window is greater than the length of the longitudinal rack; the reflector 26 is longitudinally arranged in the rectangular box, the reflector 26 and the laser beam are arranged at an incident angle of 45°, and the length of the reflector 26 is greater than the length of the longitudinal rack; the sample 28 is arranged at the bottom of the rectangular box and is located on the path of the laser beam reflected by the reflector 26; glass windows 4 are respectively embedded on the front and rear sides of the rectangular box, and an openable back cover 5 is provided at the right end of the rectangular box; an energy absorption layer 29 is provided on the upper surface of the sample 28.

[0012] Furthermore, a temperature sensor is provided in the protection box 1 , and the temperature sensor is connected to the computer 24 via a temperature sensor wire 2 .

[0013] Furthermore, the support platform 13 is provided with lens grooves for mounting the first concave lens 6 , the first convex lens 7 , the second concave lens 8 , the second convex lens 9 , the third concave lens 10 and the third convex lens 11 .

[0014] Furthermore, a groove for placing the sample 28 is provided at the bottom of the rectangular box, and a plurality of screw holes for the sample fixing bolts 3 to pass through are provided at the left end of the rectangular box. The sample fixing bolts 3 are installed on the left side plate of the rectangular box and extend into the groove through the screw holes to lock the sample 28.

[0015] The beneficial effects of the present invention are: easy to implement in the laboratory, simple to operate, and less affected by environmental factors. It can achieve complete control of the sample processing area. The entire experimental process is carried out inside the protective box. A temperature sensor is installed inside the box to know the temperature inside the box in real time. In addition, except for the need to manually install the sample, everything else is controlled by a computer system with a high degree of digitization. Low cost and good economy. It adopts a combined transmission of belt drive and gear drive, with high efficiency, large reduction ratio and high transmission stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a front view of the present invention.

[0018] Explanation of the reference numerals: 1. protection box; 2. wire of temperature sensor; 3. sample fixing bolt; 4. glass window; 5. back cover; 6. first concave lens; 7. first convex lens; 8. second concave lens; 9. second convex lens; 10. third concave lens; 11. third convex lens; 12. guide rail; 13. support platform; 14. gear; 15. bearing support; 16. bearing; 17. large pulley; 18. shaft; 19. belt; 20. small pulley; 21. motor; 22. motor control box; 23. laser transmitter controller; 24. computer; 25. guide rail support; 26. reflector; 27. laser transmitter; 28. sample; 29. ​​energy absorption layer. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto:

[0020] Referring to the accompanying drawings, a laser shot peening strengthening device suitable for plate-shaped samples includes a power device, a transmission device, a lens group device and a box device which are sequentially arranged in a transverse direction; the power device and the transmission device are arranged on a laboratory table, the lens group device is arranged on the transmission device, and the upper part of the box device is aligned with the lens group device;

[0021] The power device includes a motor 21, the output shaft of the motor 21 is connected to the input shaft of the small pulley 20, the small pulley 20 is connected to the large pulley 17 through the belt 19, the output shaft of the large pulley 17 is connected to the left end of the shaft 18, the bearing support 15 supports the shaft 18 through the bearing 16, the right end of the shaft 18 is connected to the input shaft of the gear 14, and the gear 14 is connected to the support platform 13 through the longitudinal rack arranged on the bottom surface of the support platform 13; the motor 21 is used to drive the gear 14 to rotate so that the support platform 13 reciprocates along the longitudinal rack; the motor 21 is electrically connected to the motor controller 22;

[0022] The transmission device includes a support platform 13, which is in the shape of a horizontally arranged flat plate, and a longitudinal rack and a longitudinal guide groove are arranged in parallel on the bottom surface of the support platform 13, and the longitudinal rack is located on the left side of the longitudinal guide groove; the support platform 13 is installed on the guide rail 12 through the longitudinal guide groove, and can slide back and forth on the guide rail 12; the guide rail 12 is arranged on the top of the guide rail support 25, and the length of the guide rail 12 is the same as the length of the longitudinal rack; a lens device is installed on the support platform 13;

[0023] The lens device includes a laser emitter 27, a first concave lens 6, a first convex lens 7, a second concave lens 8, a second convex lens 9, a third concave lens 10 and a third convex lens 11; the third convex lens 11, the third concave lens 10, the second convex lens 9, the second concave lens 8, the first convex lens 7 and the first concave lens 6 are arranged in sequence according to the direction of the laser beam emitted by the laser emitter 27, and their axes are all located on the optical axis of the laser beam; a lens groove for mounting the first concave lens 6, the first convex lens 7, the second concave lens 8, the second convex lens 9, the third concave lens 10 and the third convex lens 11 is provided on the support platform 13; the laser emitter 27 is electrically connected to the laser emitter controller 23, and the laser emitter controller 23 is electrically connected to the computer 24;

[0024] The direction of the laser beam emitted by the laser emitter 27 is defined as the horizontal direction, and the direction perpendicular to the horizontal direction is defined as the vertical direction;

[0025] The box device includes a reflector 26 and a sample 28 arranged in a protection box 1; the protection box 1 is a hollow rectangular box, and an incident window is provided at the left end of the rectangular box for the laser beam to enter the interior of the protection box 1, the incident window is parallel to the longitudinal rack, and the length of the incident window is greater than the length of the longitudinal rack; the reflector 26 is longitudinally arranged in the rectangular box, the reflector 26 and the laser beam are arranged at an incident angle of 45°, and the length of the reflector 26 is greater than the length of the longitudinal rack; the sample 28 is arranged at the bottom of the rectangular box and is located on the path of the laser beam reflected by the reflector 26; a groove for placing the sample 28 is provided at the bottom of the rectangular box, and a plurality of screw holes for the sample fixing bolts 3 to pass through are provided at the left end of the rectangular box, the sample fixing bolts 3 are installed on the left side panel of the rectangular box, and extend through the screw holes into the groove to lock the sample 28; glass windows 4 are respectively embedded on the front and rear sides of the rectangular box, and an openable back cover 5 is provided at the right end of the rectangular box; an energy absorption layer 29 is provided on the upper surface of the sample 28. A temperature sensor is provided in the protection box 1 , and the temperature sensor is connected to the computer 24 via a temperature sensor wire 2 .

[0026] The operation process of this experimental device is:

[0027] a. When the experiment is to be carried out, install the sample in the groove at the bottom of the rectangular box and fix the sample completely inside the groove with the sample fixing bolts.

[0028] b. Apply an energy absorbing layer on the sample with a thickness of about 50-100 μm, and then close the back cover.

[0029] c. Calculate the width of the sample area to be processed in advance and adjust the number of convex lenses and concave lenses in the lens group.

[0030] d. Turn on the laser transmitter to start the experiment, observe the sample processing area through the glass window of the protective box, and then operate the motor controller to move the processing area. At the same time, observe the temperature data and laser intensity data collected on the computer and make timely adjustments.

[0031] e. After the processing of the sample is completed, operate the motor to move the support table to one side, open the back cover of the protective box, and take out the sample.

[0032] This device uses a servo motor to control the movement of the support plate, and at the same time drives the movement of the laser transmitter and the lens group, which can control the length of the sample for shot peening. The transmission method of the pulley, gear and rack combination can improve the efficiency and stability of the transmission. The combination of lens groups can be used to control the width of the processed sample to achieve complete control of the laser shot peening area of ​​the sample. The samples are in the protection box during the entire process, and people observe the processing of the samples in the box through the glass window of the protection box, which greatly reduces the risk factor.

[0033] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A laser shot peening device suitable for plate-shaped specimens, characterized in that: It includes a power device, a transmission device, a lens group device and a box device which are arranged in sequence in the transverse direction; The power device comprises a motor (21), the output shaft of the motor (21) is connected to the input shaft of a small pulley (20), the small pulley (20) is connected to the large pulley (17) via a belt (19), the output shaft of the large pulley (17) is connected to the left end of a shaft (18), the bearing support (15) supports the shaft (18) via a bearing (16), the right end of the shaft (18) is connected to the input shaft of a gear (14), and the gear (14) is connected to the support platform (13) via a longitudinal rack arranged on the bottom surface of the support platform (13); the motor (21) is used to drive the gear (14) to rotate so that the support platform (13) reciprocates along the longitudinal rack; the motor (21) is electrically connected to a motor controller (22); The transmission device comprises a support platform (13), the support platform (13) is in the shape of a horizontally arranged flat plate, a bottom surface of the support platform (13) is provided with a longitudinal rack and a longitudinal guide rail groove in parallel, the longitudinal rack is located on the left side of the longitudinal guide rail groove; the support platform (13) is installed on the guide rail (12) through the longitudinal guide rail groove, and can slide back and forth on the guide rail (12); the guide rail (12) is arranged on the top of the guide rail support (25), and the length of the guide rail (12) is the same as the length of the longitudinal rack; a lens device is installed on the support platform (13); The lens device comprises a laser emitter (27), a first concave lens (6), a first convex lens (7), a second concave lens (8), a second convex lens (9), a third concave lens (10) and a third convex lens (11); the third convex lens (11), the third concave lens (10), the second convex lens (9), the second concave lens (8), the first convex lens (7) and the first concave lens (6) are arranged in sequence according to the direction of the laser beam emitted by the laser emitter (27), and their axes are all located on the optical axis of the laser beam; the laser emitter (27) is electrically connected to a laser emitter controller (23), and the laser emitter controller (23) is electrically connected to a computer (24); The direction of the laser beam emitted by the laser emitter (27) is defined as the horizontal direction, and the direction perpendicular to the horizontal direction is defined as the vertical direction; The box device comprises a reflector 26 and a sample (28) arranged in a protective box (1); the protective box (1) is a hollow rectangular box, the left end of the rectangular box is provided with an incident window for the laser beam to enter the interior of the protective box (1), the incident window is parallel to the longitudinal rack, and the length of the incident window is greater than the length of the longitudinal rack; the reflector (26) is longitudinally arranged in the rectangular box, the reflector (26) and the laser beam are arranged at an incident angle of 45°, and the length of the reflector (26) is greater than the length of the longitudinal rack; the sample (28) is arranged at the bottom of the rectangular box and is located on the path of the laser beam reflected by the reflector (26); glass windows (4) are respectively embedded on the front and rear sides of the rectangular box, and an openable back cover (5) is provided on the right end of the rectangular box; an energy absorption layer (29) is provided on the upper surface of the sample (28); The support platform (13) is provided with lens grooves for mounting a first concave lens (6), a first convex lens (7), a second concave lens (8), a second convex lens (9), a third concave lens (10) and a third convex lens (11); The bottom of the rectangular box is provided with a groove for placing the sample (28), and the left end of the rectangular box is provided with a plurality of screw holes for the sample fixing bolts (3) to pass through. The sample fixing bolts (3) are installed on the left side plate of the rectangular box and extend through the screw holes into the groove to lock the sample (28).

2. A laser shot peening device for plate-shaped specimens as claimed in claim 1, characterized in that: A temperature sensor is provided in the protection box (1), and the temperature sensor is connected to a computer (24) via a temperature sensor wire (2).

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