High-frequency micro-amplitude vibration-assisted laser cladding device for large-sized workpiece, and method

Abstract

Disclosed in the present invention are a high-frequency micro-amplitude vibration-assisted laser cladding device for a large-sized workpiece, and a method. Parallel multi-wave cams in the device are coaxially arranged with an equal phase difference and are mounted on a spindle of an upper static box body; the multi-wave cams are curtate epicycloidal gears; the parallel multi-wave cams and corresponding cantilever beams form an excitation source; corresponding cantilever beam groups are mounted inside a lower movable box body; an upper static box body assembly and a lower movable box body assembly form a moving pair in vertical close contact; the lower movable box body is mounted on a vibration bearing plate; the right end of the lower movable box body and a pair of high-natural-frequency springs are fixedly supported; the lower ends of the high-natural-frequency springs and a frame are fixedly supported; and the multi-wave cams are driven by an electric motor by means of belt pulleys. The amplitude of a machined part can be adjusted on the basis of requirements, and the vibration frequency of the machined part is changed by means of changing the number of multi-wave cams and the number of corresponding cantilever beams, such that the device is particularly suitable for vibration-assisted laser cladding so as to refine grains, release stress, homogenize phases and obtain a forged structure.

Description

A device and method for high-frequency micro-amplitude vibration-assisted laser cladding of large-size workpieces Technical Field

[0001] The present invention relates to the field of mechanical vibration technology of an exciter device capable of achieving 500Hz to 1000Hz and an amplitude of 5μm to 50μm, and in particular to a high-frequency, micro-amplitude vibration-assisted laser cladding device and method for large-sized workpieces. Background Art

[0002] Laser cladding, a typical additive manufacturing technology, boasts advantages such as good formability, dense microstructure, refined grains, and a small heat-affected zone, and is gaining widespread adoption in industrial fields such as remanufacturing and surface strengthening. However, the concentrated heat input and rapid solidification rate of the melt pool during laser cladding lead to defects such as uneven distribution of elements and hard phase additives, segregation, and porosity, hindering the ability to achieve higher-quality finishes. Optimizing the laser cladding process by addressing these defects is urgently needed to improve the performance of the cladding layer.

[0003] Mechanical high-frequency, micro-amplitude vibration is an effective auxiliary process for breaking dendrites, refining grains, promoting melt pool agitation, improving the uniform distribution of elements and hard phases, facilitating gas expulsion, reducing residual stress, and significantly improving the mechanical properties of workpieces during casting or welding. Laser cladding is a rapid solidification and cooling process. Existing mechanical high-frequency, micro-amplitude vibration cannot achieve these effects for large-scale workpieces. Therefore, an exciter device with a frequency of 500 to 1000 Hz and an amplitude of 5 to 50 μm is required. The present invention is designed with an 800 Hz parameter and has achieved the intended purpose in practice.

[0004] The main forms of mechanical vibration are:

[0005] (1) Eccentric and centrifugal vibrators have simple structures but produce circular vibrations with low frequencies;

[0006] (2) The electro-hydraulic vibrator device has a large amplitude but a narrow frequency range (100-150 Hz);

[0007] (3) Hydraulic and pneumatic vibrator devices have small amplitude and low frequency;

[0008] (4) Electromagnetic and magnetostrictive methods have high frequencies (up to 10,000 Hz) and small amplitudes (≤50 μm). The excitation force is so small that it is difficult to drive a large-mass excitation platform. For laser surface strengthening and remanufacturing of medium- and large-sized workpieces, it is necessary to develop high-frequency, micro-amplitude devices suitable for laser cladding strengthening or remanufacturing of large-sized workpieces.

[0009] Summary of the Invention

[0010] Technical Purpose

[0011] In response to the above technical problems, the present invention proposes a high-frequency, micro-amplitude vibration-assisted laser cladding device and method for large-size workpieces, which can generate vibrations of 500Hz to 1000Hz and 5μm to 50μm, and is particularly suitable for vibration-assisted laser cladding to refine grains, release stress, homogenize phases, and obtain forged structures.

[0012] To achieve the above object, the present invention adopts the following technical solutions:

[0013] A high-frequency micro-amplitude vibration-assisted laser cladding device for large-size workpieces, comprising:

[0014] The rack, located at the very bottom of the unit;

[0015] A bracket is provided on the frame, the bracket supports and connects an upper static box, and the bottom of the upper static box is provided with an opening;

[0016] A main shaft is installed in the upper static box, with both ends of the main shaft being connected to the upper static box for rotational support;

[0017] A plurality of multi-wave cams are mounted on the main shaft with equal phase differences along the axis direction of the main shaft;

[0018] The upper opening of the lower moving box is provided and is provided below the bottom opening of the upper static box. The inner side wall of the lower moving box is in sliding and sealing connection with the outer side wall of the upper static box. A cantilever beam is provided in the lower moving box corresponding to each multi-wave cam in the upper static box. The cantilevered end of the cantilever beam contacts the multi-wave cam via a rolling body. The bottom of the lower moving box is supported on the frame via a high natural frequency spring.

[0019] A vibration receiving plate is arranged horizontally on the frame, one end of which is hinged to a frame hinge arranged at one end of the frame, and the other end is mounted on a lower moving box. A workpiece is mounted in the middle area of ​​the vibration receiving plate, and one end mounted on the lower moving box is connected to a high natural frequency spring to form a simply supported beam.

[0020] The motor is used to drive the main shaft to rotate, and then drive the multiple multi-wave cams on the main shaft that are set with equal phase differences to rotate. The convex part of the multi-wave cam excites the rolling body at the end of the cantilever beam to produce a downward displacement. When it rotates to the concave part of the multi-wave cam, the cantilever beam is reset by elastic rebound. At this point, the system completes a single excitation; the vibration generated by the cantilever beam is transmitted to the vibration receiving plate through the cantilever beam and the fixed support end of the lower moving box, and the workpiece mounted on the vibration receiving plate obtains a high-frequency micro-vibration greater than 800Hz.

[0021] The vibration receiving plate is provided with a long groove for adjusting the vertical distance between the workpiece and the lower moving box.

[0022] The upper static box body includes a top cover, a left open end cover and a right closed end cover, wherein the left open end cover and the top cover are welded, and the right closed end cover and the top cover are connected by screws.

[0023] The rolling body is a rolling bearing connected to the end of the cantilever beam. The rolling bearing contacts the outer contour of the multi-wave cam, converting the sliding friction between the parts into rolling friction. The length of the cantilever beam is half the width of the lower moving box body. The cantilever beam components are divided into two rows and fixed on the left and right sides of the lower moving box body.

[0024] Slots are made on the inner sides of the lower moving box body to place polytetrafluoroethylene plates to achieve sealing and lubrication between the inner side of the lower moving box body and the outer side of the upper static box body. The outer surface of the upper static box body and the inner surface of the lower moving box body form a moving pair. Lubricating oil is poured into the lower moving box body to cover the rolling elements at the overhanging end of the cantilever beam, reducing friction while taking away heat.

[0025] The upper end of the high natural frequency spring supports the vibration receiving plate, and the lower end is fixedly connected to the frame.

[0026] The output shaft of the motor is transmitted to the main shaft through a pair of pulleys. A motor pre-tightening device is fixed on the frame, and the motor pre-tightening device is used to realize pre-tightening of the belt drive.

[0027] The high natural frequency spring is a rigid arc-shaped shaft segment with a certain curvature. A pin hole is opened at the end of the rigid arc-shaped shaft segment. The natural frequency of the rigid arc-shaped shaft segment is above 1300Hz, and the stiffness is not less than 14.3kN / mm. It can output micron-level amplitude, meeting the use requirements of the vibration test bench.

[0028] The present invention further discloses a method for vibrating a workpiece by utilizing the large-scale workpiece high-frequency micro-amplitude vibration-assisted laser cladding device. The workpiece is fixed to the vibration receiving plate through a through hole on a fixture. The motor is powered, and the motor spindle rotates, driving a plurality of multi-wave cams arranged with equal phase differences on the spindle to rotate. The convex portion of the multi-wave cam excites the rolling body at the end of the cantilever beam to produce a downward displacement. When the cantilever beam rotates to the concave portion of the multi-wave cam, the cantilever beam is reset by elastic rebound. At this point, the system completes a single excitation.

[0029] The vibration generated by the cantilever beam is transmitted to the vibration receiving plate through the fixed support end of the lower moving box, and the workpiece mounted on the vibration receiving plate obtains high-frequency micro-vibration greater than 800Hz;

[0030] By changing the position of the workpiece on the vibration receiving plate from the lower moving box through the long groove, the amplitude of the workpiece can be changed within the range of 5μm to 50μm;

[0031] By changing the motor speed, the vibration frequency of the workpiece can be changed within the range of 500Hz to 1000Hz. Beneficial effects

[0032] The present invention provides a high-frequency, micro-amplitude vibration-assisted laser cladding device for large-scale workpieces. This device ultimately achieves the effects of grain refinement, stress release, uniform phase distribution, and forged structure during laser strengthening and remanufacturing. Compared with existing devices, it has the following technical effects:

[0033] 1. The present invention relates to a high-frequency, micro-amplitude vibration-assisted laser cladding device for large-scale workpieces. This device generates vibrations of 500 Hz to 1000 Hz and 5 μm to 50 μm by coaxially juxtaposing multi-wave cams with equal phase differences and corresponding cantilever beams. The multi-wave cams are short-amplitude epicycloidal wheels with continuous derivatives of arbitrary order. The cantilever beam assembly corresponding to the multi-wave cams is driven by a single-sided force through a rolling bearing mounted at the right end of the cantilever beam. The elasticity of the cantilever beam is then used to achieve displacement return, thereby reducing the impact of double-sided contact on manufacturing errors and deformation.

[0034] After the cantilever beam group is stimulated to move, it relies on its own elasticity to reset, thereby avoiding high manufacturing precision.

[0035] 2. The present invention adopts a high natural frequency spring made of 65Mn material to support the box body, which has a high natural frequency and meets the needs of high-frequency micro-amplitude vibration.

[0036] 3. The upper static box assembly and the lower dynamic box assembly described in the present invention form a moving pair in close contact up and down, thereby separating the vibration of the device from the drive system. The upper static box assembly and the brackets at both ends form a fixed hinge to achieve stable and continuous drive transmission.

[0037] 4. In the working area of ​​the vibration receiving plate, the vertical distance between the test piece and the lower moving box is adjusted by the long groove, so that the amplitude of the workpiece can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a diagram of power transmission of the device of the present invention;

[0039] Among them, 71 is the motor; 73 is the small pulley; 74 is the large pulley;

[0040] FIG2 is a schematic diagram of the installation of a multi-wave cam of the device of the present invention;

[0041] Among them, 11 is the multi-wave cam; 12 is the main shaft; 13 is the multi-wave cam key; 14 is the deep groove ball bearing; 75 is the large pulley key;

[0042] FIG3 is a schematic diagram of the short-amplitude epicycloid of the device of the present invention;

[0043] Among them, O1 is the center of the cam; O2 is the center of the roller; r2 is the radius of the roller; is the angle between the line connecting the centers of the circle and the x-axis; the distance from a point P on the moving circle to its center O2 is b (b<r2);

[0044] FIG4 is a front view of the multi-wave cam of the device of the present invention;

[0045] Among them, 11 is a multi-wave cam; 111 is a through hole; 112 is a boss; 113 is a keyway;

[0046] FIG5 is a mechanical model diagram of the cantilever beam of the device of the present invention;

[0047] Wherein, h is the thickness of the cantilever beam; b is the width of the cantilever beam; l is the length of the cantilever beam; m1 is the mass of the cantilever beam; m is the mass of the roller at the overhanging end of the cantilever beam; S is the deformation of the overhanging end of the cantilever beam; F is the force applied to the overhanging end; d is the diameter of the rolling element at the overhanging end of the cantilever beam;

[0048] FIG6 is an isometric view of the cantilever beam assembly of the apparatus of the present invention;

[0049] Among them, 21 is a cantilever beam; 211 is a through hole; 22 is a support shaft; 23 is a rolling bearing; 24 is a positioning pin;

[0050] FIG7 is an isometric view of the lower moving box assembly of the device of the present invention;

[0051] Among them, 51 is the cantilever beam connecting plate; 52 is the cylindrical elastic pin; 53 is the side connecting plate; 54 is the bottom plate;

[0052] FIG8 is an isometric view of the cantilever beam connecting plate of the lower moving box of the device of the present invention;

[0053] Among them, 512 is a fixed block with a through hole; 511 is a groove;

[0054] FIG9 is a schematic diagram of the upper static box assembly of the device of the present invention;

[0055] Among them, 61 is the left open end cap; 611 is the left end cap boss; 62 is the top cap; 621 is the threaded block; 63 is the right closed end cap; 631 is the right end cap boss; 632 is the through hole;

[0056] 10 is a schematic diagram of the upper and lower box assembly of the device of the present invention;

[0057] Among them, 13 is the spindle key; 621 is the fastening screw; 2 is the cantilever beam assembly; 3 is the high natural frequency spring;

[0058] FIG11 is a schematic diagram of the multi-wave cam cantilever beam matching device of the present invention;

[0059] FIG12 is a schematic diagram of a high natural frequency spring device according to the present invention;

[0060] Among them, 31 is the connector at both ends; 32 is the limit; R1 is the upper quarter arc; R2 is the lower quarter arc;

[0061] FIG13 is an isometric view of the frame of the apparatus of the present invention;

[0062] Among them, 4 is a vibration receiving plate; 411 is a hinge; 412 is a long slot; 42 is an elastic pin; 43 is a pin shaft; 72 is a motor pre-tightening device; 81 is a bracket; and 82 is a frame hinge. DETAILED DESCRIPTION

[0063] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", "inside", "outside", etc., are only reference to the directions of the drawings. Therefore, the use of directional words is to illustrate rather than limit the invention.

[0064] Example

[0065] As shown in FIG1 , a high-frequency micro-amplitude vibration-assisted laser cladding device for large-sized workpieces is shown, in which a motor 71 transmits torque to a large pulley 74 through a small pulley 73 at a fixed transmission ratio.

[0066] As shown in Figure 2, the torque of the large pulley 74 is transmitted to the main shaft 12 through the large pulley key 75. The main shaft is supported and fixed by deep groove ball bearings 14 at both ends. The multi-wave cam key 13 transmits the power of the main shaft 12 to the multi-wave cam 11. There are a total of ten multi-wave cams on the shaft (four of the ends are hidden for easy observation) installed with equal phase differences, so that the number of excitations per unit time is increased.

[0067] Specifically, as shown in Figures 3 and 4, the profile of the multi-wave cam 11 is designed by parametric equations, holes 111 are dug around the periphery to reduce the weight of the part, a boss 112 is machined in the center to fix its position on the axis, and a keyway 113 is machined at the same time. The thickness of the rim of the multi-wave cam 11 is slightly larger than the thickness of the cantilever beam rolling bearing 23.

[0068] As shown in Figures 5 and 6, the relevant calculation parameters of the cantilever beam 21 are given in Figure 5. The cantilever beam assembly 2 is composed of a cantilever beam 21, a support shaft 22, and a rolling bearing 23. The rolling bearing 23 is positioned by a locating pin 24 to ensure alignment with the contour surface of the multi-wave cam 11. A through hole 211 is provided at the fixed support end of the cantilever beam 21 for connecting to the cantilever beam connecting plate 51 of the lower moving box.

[0069] As shown in Figure 7, the length of the cantilever beam 21 is half the length of the side connecting plate 53. The cantilever beam assemblies 2 on both sides of the lower moving box are staggered in sequence. Five pairs of cantilever beam assemblies 2 are fixed to the cantilever beam connecting plate 51 through cylindrical elastic pins 52. There is a groove 511 near the top for embedding polytetrafluoroethylene plates. Two symmetrical cantilever beam connecting plates 51, two symmetrical side connecting plates 53 and a bottom plate 54 are welded into a complete upper open box.

[0070] 8 , the cantilever beam connecting plate 51 is formed by welding a long flat plate with a groove 511 and a fixing block 512 with a through hole. The fixing block 512 with a through hole is concentric with the through hole of the cantilever beam 21 and is fixed with a cylindrical elastic pin 52 .

[0071] As shown in Figure 9, the left side of the upper static box body 6 is welded by an open end cover 61 and a top cover 62. The right closed end cover 63 is welded through six threaded blocks 621 welded through the top cover 62. The left end cover boss 611 and the right end cover boss 631 are connected to the bracket 81. A bearing seat is opened inside the end cover for installing the deep groove ball bearing 14 of the main shaft. After assembling the multi-wave cam assembly 1, the right closed end cover 63 is covered and connected to the top cover 62 using six screws through the through hole 632 to form a complete lower open box body.

[0072] As shown in Figures 10 and 11, the upper static box body 6 is supported by the bracket 81, and a main shaft 12 is installed inside the upper static box body 6. The main shaft 12 is supported on the bearing seat in the end cover boss through a deep groove ball bearing 14. The length and width of the inner wall of the lower moving box body are slightly larger than the length and width of the outer wall of the upper static box body 6. Ten multi-wave cams 11 are installed at a certain angle along the axis of the main shaft 12. Each multi-wave cam 11 corresponds to a group of cantilever beam components 2 at the bottom. Each multi-wave cam 11 successively drives the cantilever beam 21 to continuously move downward at equal time intervals, thereby generating continuous and stable vibration. The lower moving box body is supported by a high natural frequency spring 3.

[0073] Specifically, as shown in Figure 12, the high natural frequency spring 3 is composed of two quarter circles, connecting heads 31 at both ends, and limiters 32. The upper connecting head is connected to the vibration receiving plate 41 with an elastic pin 42, and the lower connecting head is connected to the frame 8 with an elastic pin 42. This constrains the freedom of the spring in the horizontal direction. When the upper end is subjected to vibration force, the spring only undergoes slight deformation in the vertical direction.

[0074] As shown in Figure 13, the high natural frequency spring 3 is connected to the vibration receiving plate 41 and the frame 8 through the elastic pin 42. The other end of the vibration receiving plate 41 is a hinge 411, which is connected to the frame hinge 82 through the pin shaft 43. The workpiece to be processed is installed in the working area of ​​the vibration receiving plate 41. The vertical distance between the workpiece and the lower moving box is adjusted by the long slot 412, and the amplitude can be adjusted. The motor preload device 72 is fixed on the frame 8 to realize the preload of the belt drive.

[0075] The mechanical model of the cantilever beam is shown in Figure 5. The cantilever beam is a thin plate made of 65Mn spring steel (b×h×l), where h is the thickness of the cantilever beam, b is the width of the cantilever beam, and l is the length of the cantilever beam;

[0076] The moment of inertia J of the cantilever beam about its centroidal axis y y =b×h 3 / 12, the stiffness of the cantilever beam k = 3EJ y / l 3 , where E is the elastic modulus of 65Mn material;

[0077] Elastic recovery force Where S is the displacement of the cantilever end.

[0078] The mass m1 of a single cantilever beam is calculated based on the cantilever beam length l, cantilever beam width b, and cantilever beam thickness h of the thin plate. The concentrated mass m at the end of the cantilever beam is determined by the rolling bearing. When calculating, the mass of the cantilever beam is equivalent to the end m. e , the mass m0=m at the vibration displacement e +m.

[0079] Natural circular frequency of a single cantilever beam Natural period Natural frequency

[0080] Assuming that the rolling bearing is pressed down S, the simultaneous equations F hfZ =m0·a Z , where F hfZ is the elastic restoring force of the cantilever beam after deformation, a Z is the acceleration of the cantilever end when it falls to this height;

[0081] Solving the differential equations gives the time t1. Theoretically, the frequency of a single cantilever beam system is Angular velocity ω1=2πf1, then the speed corresponding to a single impact head is In the present invention, 10 multi-wave cams are rotated simultaneously, so the main shaft speed is And the number of teeth of each multi-wave cam is 10, so the theoretical excitation frequency is 10f1.

[0082] In the short-spoke epicycloid of the moving point on the outer planetary gear shown in Figure 3, the radius of the circle is set to r3, the radius of the moving circle is r2, and the distance from a point P on the moving circle to its center O2 is b (b<r2). is the angle between the line connecting the centers of the circle and the x-axis, then the parametric equation of point P on the curve about the x- and y-axes is expressed by trigonometric functions as follows:

[0083] In Figure 12, when the top of the spring is subjected to a vertical force, the Mohr integral is used to obtain the linear displacement of the force point in the vertical direction, thereby calculating the spring stiffness, and then the natural frequency of the spring is obtained to be above 1000 Hz, which meets the use requirements.

[0084] The above only describes in detail the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the scope of protection of the present invention.

Claims

1. A high-frequency micro-amplitude vibration-assisted laser cladding device for large-size workpieces, characterized in that: include: The rack, located at the very bottom of the device; A bracket is arranged on the frame, the bracket supports and connects an upper static box, and the bottom of the upper static box is opened; A main shaft is installed in the upper static box, and two ends of the main shaft are connected to the upper static box for rotation support; A plurality of multi-wave cams are mounted on the main shaft with equal phase differences along the axis direction of the main shaft; The upper opening of the lower moving box is provided and is provided below the bottom opening of the upper static box, and the inner wall of the lower moving box is slidably and sealedly connected with the outer wall of the upper static box; a cantilever beam is provided in the lower moving box corresponding to each multi-wave cam in the upper static box, and the cantilevered end of the cantilever beam is in contact with the multi-wave cam through a rolling body; the bottom of the lower moving box is supported on the frame through a high natural frequency spring; A vibration receiving plate is arranged on the frame in a horizontal direction, one end of which is hinged to a frame hinge arranged at one end of the frame, and the other end is installed with a lower moving box body, a workpiece is installed in the middle area of ​​the vibration receiving plate, and one end of the lower moving box body is connected to a high natural frequency spring to form a simply supported beam; The motor is used to drive the main shaft to rotate, and then drive multiple multi-wave cams on the main shaft that are set with equal phase differences to rotate. The convex part of the multi-wave cam excites the rolling body at the end of the cantilever beam to produce a downward displacement. When rotating to the concave part of the multi-wave cam, the cantilever beam is reset by elastic rebound, and the system completes a single excitation. The vibration generated by the cantilever beam is transmitted to the vibration receiving plate through the cantilever beam and the fixed support end of the lower moving box, and the workpiece installed on the vibration receiving plate obtains a high-frequency micro-vibration greater than 800Hz.

2. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: The vibration receiving plate is provided with a long groove for adjusting the vertical distance between the workpiece and the lower moving box body.

3. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: The upper static box body comprises a top cover, a left open end cover and a right closed end cover, wherein the left open end cover and the top cover are welded, and the right closed end cover and the top cover are connected by screws.

4. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: The rolling body is a rolling bearing connected to the end of the cantilever beam. The rolling bearing contacts the outer contour of the multi-wave cam to convert the sliding friction between the parts into rolling friction. The length of the cantilever beam is half the width of the lower moving box body. The cantilever beam components are divided into two rows and fixed on the left and right sides of the lower moving box body.

5. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: Grooves are cut on the inner sides around the lower moving box body to place polytetrafluoroethylene plates to achieve sealing and lubrication between the inner side of the lower moving box body and the outer side of the upper static box body. The outer surface of the upper static box body and the inner surface of the lower moving box body form a moving pair. Lubricating oil is poured into the lower moving box body to cover the rolling element at the overhanging end of the cantilever beam, reducing friction while taking away heat.

6. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: The upper end of the high natural frequency spring supports the vibration receiving plate, and the lower end is fixedly connected to the frame.

7. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: The output shaft of the motor is transmitted to the main shaft through a pair of pulleys. A motor pre-tightening device is fixed on the frame, and the motor pre-tightening device is used to realize the pre-tightening of the belt drive.

8. The large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device according to claim 1 is characterized in that: The high natural frequency spring is a rigid arc-shaped shaft segment with a certain curvature. A pin hole is opened at the end of the rigid arc-shaped shaft segment. The natural frequency of the rigid arc-shaped shaft segment is above 1300 Hz, and the stiffness is not less than 14.3 kN / mm. It can output micron-level amplitude, meeting the use requirements of the vibration test bench.

9. A method for vibrating a workpiece by using the large-size workpiece high-frequency micro-amplitude vibration-assisted laser cladding device as claimed in any one of claims 2 to 8, characterized in that: The workpiece is fixed on the vibration receiving plate through the through hole on the fixture, and the motor is powered on. The motor spindle rotates, driving multiple multi-wave cams set with equal phase differences on the spindle to rotate. The convex part of the multi-wave cam excites the rolling body at the end of the cantilever beam to produce a downward displacement. When the cantilever beam rotates to the concave part of the multi-wave cam, the cantilever beam is reset by elastic rebound. At this point, the system completes a single excitation; The vibration generated by the cantilever beam is transmitted to the vibration receiving plate through the cantilever beam and the fixed support end of the lower moving box, and the workpiece mounted on the vibration receiving plate obtains a high-frequency micro-vibration greater than 800 Hz; By changing the position of the workpiece on the vibration receiving plate from the lower moving box through the long groove, the amplitude of the workpiece can be changed within the range of 5μm to 50μm; Changing the motor speed can change the vibration frequency of the workpiece within the range of 500Hz to 1000Hz.

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