Ultrasonic rolling-based pattern superposition alternating surface strengthening method

Abstract

The invention relates to a pattern superposition alternating surface strengthening method based on ultrasonic rolling. The pattern superposition alternating surface strengthening method comprises the following steps that S1, a base material is pretreated; s2, designing and preparing powder; s3, a path is planned on the surface of the base body through the laser cladding technology, and a coating is prepared; s4, flaw detection development is conducted on the surface of the coating, whether micro cracks exist on the surface or not is observed, and if cracks exist, the step S3 is executed again to prepare the coating again; s5, residual stress between the coating and a matrix interface is eliminated through post-heat treatment, the heat treatment temperature is 250 + / -10 DEG C, and the heat preservation time is 2 h; and S6, the surface of the coating is milled, the remanufactured coating meeting the standard is subjected to ultrasonic rolling treatment, and the surface integrity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic rolling equipment, and in particular to an ultrasonic rolling equipment and a texture superimposed alternating surface strengthening method. Background Art

[0002] Ultrasonic rolling is a surface strengthening technology. It can produce high residual compressive stress on the surface of the workpiece by hitting the surface of the workpiece with high-frequency vibration, increase hardness and reduce surface roughness, so that the fatigue specimen performance of the workpiece is greatly improved. Metal materials play an extremely important role in the engineering field due to their good mechanical properties and processing properties. From steel structural materials used in daily construction, to lightweight alloy steel in the aerospace field, to automobile torsion shafts and frame materials, metal materials are almost everywhere. my country consumes hundreds of millions of tons of metal materials every year, most of which are non-renewable resources. Under long-term mining and consumption, resources are facing the risk of depletion. At present, domestic ship propulsion devices use conventional heat-treated 45CrNiMoVA high-strength steel, which is prone to cracks in wear and corrosion under harsh corrosive conditions. Considering the high replacement cost, its surface repair work is particularly important. Laser additive manufacturing has the characteristics of rapid heating and rapid cooling, and the grains in the coating are significantly refined, which improves the surface performance of the workpiece to a certain extent. However, this characteristic will cause large residual tensile stress in the coating, affecting the subsequent service performance. Therefore, the laser cladding coating is strengthened by ultrasonic rolling.

[0003] Ultrasonic rolling, as a nano-technology, can form nanostructures on the surface of the workpiece and form a gradient structure inside the workpiece. After ultrasonic rolling, the workpiece is affected by element distribution, grain size, residual compressive stress, hardness and surface roughness, which hinders the deep expansion of corrosive ions and makes the corrosion process more difficult.

[0004] However, traditional rolling requires adjustment of multiple process parameters such as the amount of pressure, processing speed, and static pressure. If the parameters are not adjusted properly, the strengthening effect will not be obvious, and it may even affect the normal use of the workpiece.

[0005] In addition, after searching, a Chinese patent with announcement number CN216237172U discloses an induction heating assisted ultrasonic rolling surface layer strengthening device, which can perform surface ultrasonic rolling processing at a specific temperature through the cooperation of a force measuring component, a rolling component and a heating component, so that the surface performance of the workpiece to be processed is greatly improved. During actual processing, the dust on the surface of the workpiece will be pressed into the surface of the workpiece during the rolling process, making the originally smooth surface rough. Therefore, the workpiece is cleaned and lubricated before ultrasonic rolling. In the prior art, these three processes are generally performed separately by three types of equipment. However, this method has poor continuity and is prone to being contaminated with dust again during the turnover of the workpiece, affecting its quality.

[0006] In order to solve the above problems, the present invention proposes an ultrasonic rolling device and a texture superposition alternating surface strengthening method based on ultrasonic rolling. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, meet practical needs, and provide an ultrasonic rolling device and a texture superposition alternating surface strengthening method based on ultrasonic rolling to solve the above technical problems.

[0008] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0009] A method for strengthening a surface by superimposing alternating patterns based on ultrasonic rolling, characterized in that it comprises the following steps:

[0010] S1. Matrix material pretreatment

[0011] The oxide film and oil stains in the damaged area of ​​45CrNiMoVA steel were removed by using 200-mesh, 400-mesh and 800-mesh sandpaper, and the surface was cleaned with anhydrous ethanol to show the damaged area.

[0012] S2. Powder design and preparation

[0013] The iron-based alloy powder is prepared by argon atomization. The weight ratio of each element in the iron-based alloy powder is: C 0.18%-0.24%, Ni 1.8%-2.5%, Cr 17%-18.5%, Mn 0.13%-0.25%, Si 1%-1.2%, B1.1%-1.4%, and the balance is iron. The powder particle size is 45-150μm, and the spherical powder is ≥90%.

[0014] S3. Use laser cladding technology to plan paths and prepare coatings on the substrate surface.

[0015] S4. Perform flaw detection and development on the coating surface to observe whether there are microcracks on the surface. If there are cracks, return to S3 to re-prepare the coating.

[0016] S5. Post-heat treatment is used to eliminate the residual stress between the coating and the substrate interface. The heat treatment temperature is 250℃±10℃ and the holding time is 2h.

[0017] S6. Mill the coating surface and ultrasonically roll the remanufactured coating that meets the standards to improve the surface integrity.

[0018] S7. Use ultrasonic rolling equipment to perform ultrasonic rolling processing on the coating surface.

[0019] Furthermore, during ultrasonic rolling, the ultrasonic frequency is 28.5 KHz, the rolling bead diameter is 15 mm, the moving speed is 20 mm / s, and the static load is 0.3 MPa.

[0020] An ultrasonic rolling device comprises a horizontal driving base and a movable base installed on the horizontal driving base and driven by the horizontal driving base, the front of the movable base is slidably connected to a mounting base, the front of the mounting base is fixedly connected to an ultrasonic rolling assembly, the upper surface of the movable base is fixedly connected to an air pump, the air inlet end of the air pump is fixedly connected to an air inlet pipe, one end of the air inlet pipe is fixedly connected to a wind hood, the wind hood is located directly in front of the ultrasonic rolling assembly, the ultrasonic rolling assembly can transmit vibration to the workpiece to destroy the adsorption force between dust and the workpiece surface so as to facilitate dust removal by the air pump, the bottom of the mounting base is fixedly connected to a connecting plate, and the upper surface of the connecting plate is fixedly connected to a lubrication assembly.

[0021] Furthermore, a dust box is fixedly connected to the back of the movable seat, the back of the dust box is open, and a filter is detachably connected to the inner wall of the dust box, and an air outlet pipe is fixedly connected to the air outlet end of the air pump, and one end of the air outlet pipe extends to the inner cavity of the dust box.

[0022] Furthermore, the ultrasonic rolling assembly includes a clamp fixedly connected to the front side of the mounting seat, a transducer is detachably connected to the clamp, one end of the transducer is fixedly connected to a variable amplitude rod, a rolling head is provided at the bottom end of the variable amplitude rod, and a through hole is opened on the upper surface of the connecting plate for the variable amplitude rod to pass through.

[0023] Furthermore, a guide rail is fixedly connected to the front side of the movable seat, the mounting seat is slidably connected to the surface of the guide rail, the bottom end of the guide rail is fixedly connected to a limiting block, one side of the movable seat is fixedly connected to a cylinder, the output end of the cylinder is fixedly connected to a connecting seat, and the connecting seat is fixedly connected to one side of the mounting seat.

[0024] Furthermore, the lubrication assembly is located between the wind hood and the ultrasonic rolling assembly.

[0025] Furthermore, the lubrication assembly includes a storage box fixedly connected to the upper surface of the connecting plate, the lower surface of the connecting plate is fixedly connected to an outer shell, the outer shell is communicated with the storage box, the inner cavity of the outer shell is provided with a rotating brush roller, the lubricating oil in the storage box can flow to the surface of the brush roller to oil the workpiece, the upper surface of the storage box is provided with a feed port, and the inner wall of the feed port is provided with a plug.

[0026] Furthermore, a slide groove is provided on the side of the shell, and a slider is slidably connected to the inner wall of the slide groove, the opposite surfaces of the two sliders are fixedly connected to the same fixed shaft, the brush roller is rotatably connected to the surface of the fixed shaft, the upper surface of the slider is fixedly connected to a pressure spring, and the top end of the pressure spring is fixedly connected to the lower surface of the connecting plate.

[0027] Furthermore, a flow channel is formed at the bottom of the storage box, and an avoidance opening for the flow channel to pass through is provided on the upper surface of the connecting plate, and the flow channel passes through the avoidance opening and extends to the interior of the shell, and an oil filling hole is provided at the bottom of the flow channel, and the oil filling hole is in the shape of a rectangular strip, and an opening and closing block is arranged in the oil filling hole, and the cross-section of the opening and closing block is triangular, and a spring seat is fixedly connected to the upper surface of the opening and closing block, and a sliding rod is fixedly connected to the upper surface of the spring seat, and the inner wall of the flow channel is fixedly connected to a fixing plate, and a sliding hole is provided on the upper surface of the fixing plate, and the sliding rod is slidably connected to the inner wall of the sliding hole, and an opening and closing spring is sleeved on the surface of the sliding rod, one end of the opening and closing spring is fixedly connected to the spring seat, and the other end of the opening and closing spring is fixedly connected to the fixing plate, and the bottom of the opening and closing block is provided with a rounded corner.

[0028] Furthermore, the horizontal driving base includes a base, and two first electric slides are fixedly connected to the upper surface of the base, and the output ends of the two first electric slides are fixedly connected to the same second electric slide. The movable seat is installed on the second electric slide, and the second electric slide can drive the movable seat to move.

[0029] Beneficial effects:

[0030] 1. In the present invention, a horizontal driving base is provided to drive the ultrasonic rolling assembly so as to reset or move it and complete the rolling operation. An air pump, a lubrication assembly and an ultrasonic rolling assembly are provided to respectively complete dust removal, lubrication and rolling operations. The dust removal, lubrication and rolling operations are completed continuously. The workpiece does not need to be circulated, thereby reducing the chance of it being contaminated with dust again. When the ultrasonic rolling assembly completes the rolling operation, the vibration is transmitted to the workpiece, which can destroy the adsorption force between the dust and the surface of the workpiece, thereby improving the dust removal effect of the air pump.

[0031] 2. In the present invention, a brush roller is provided so that the lubricating oil in the storage box falls onto the surface of the brush roller. As the brush roller rotates along the surface of the workpiece, the lubricating oil is coated on the surface of the workpiece to achieve automatic lubrication and reduce the wear of the rolling head. An opening and closing block is provided, under normal conditions, the opening and closing spring generates pressure on the spring seat, so that the opening and closing block closes the oil filling hole to prevent the lubricating oil from leaking. Under working conditions, the brush roller lifts the opening and closing block to open the oil filling hole so that the lubricating oil can flow out.

[0032] 3. This method performs laser additive manufacturing on the defective parts of the workpiece surface and improves the ultrasonic rolling strengthening method. By adjusting the ultrasonic rolling processing direction, multi-path texture superposition is achieved to further reduce the surface roughness of the workpiece. At the same time, through multiple ultrasonic rolling in different directions, the degree of plastic deformation of the workpiece surface is increased and the strengthening depth of the workpiece is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the three-dimensional structure of the mobile seat of the present invention;

[0035] Figure 3 It is a schematic diagram of the side section structure of the clamp of the present invention;

[0036] Figure 4 It is a cross-sectional structural schematic diagram of the connecting plate, storage box and shell of the present invention;

[0037] Figure 5 It is a schematic cross-sectional structural diagram of the roller brush of the present invention;

[0038] Figure 6 It is a schematic diagram of the side section structure of the storage box of the present invention;

[0039] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0040] Figure 8 It is a schematic diagram of the three-dimensional structure of the dust collecting box of the present invention;

[0041] Fig. 9 It is a schematic diagram of the three-dimensional structure of the horizontal driving machine base of the present invention;

[0042] Fig.10 It is a schematic diagram of the process of the texture superposition alternating surface strengthening method based on ultrasonic rolling.

[0043] The reference numerals are as follows:

[0044] 1. Horizontal drive base; 101. Base; 102. First electric slide; 103. Second electric slide; 2. Moving base; 3. Mounting base; 4. Ultrasonic rolling assembly; 401. Clamp; 402. Transducer; 403. Amplifier; 404. Rolling head; 5. Air pump; 6. Air inlet pipe; 7. Wind hood; 8. Connecting plate; 9. Lubrication assembly; 901. Storage box; 902. Housing; 903. Brush roller; 904, plug; 905, slider; 906, fixed shaft; 907, pressure spring; 908, flow channel; 909, oil filling hole; 910, opening and closing block; 911, spring seat; 912, slide bar; 913, fixed plate; 914, opening and closing spring; 915, rounded corner; 10, dust box; 11, filter screen; 12, air outlet pipe; 13, guide rail; 14, limit block; 15, cylinder; 16, connecting seat. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-9 The present invention is further described with examples:

[0046] Example 1

[0047] like Figure 1-9 As shown, an ultrasonic rolling device includes a horizontal driving base 1 and a movable base 2 installed on the horizontal driving base 1 and driven by the horizontal driving base 1, the front of the movable base 2 is slidably connected with a mounting base 3, the front of the mounting base 3 is fixedly connected with an ultrasonic rolling assembly 4, the upper surface of the movable base 2 is fixedly connected with an air pump 5, the air inlet end of the air pump 5 is fixedly connected with an air inlet pipe 6, one end of the air inlet pipe 6 is fixedly connected with a wind hood 7, the wind hood 7 is located directly in front of the ultrasonic rolling assembly 4, the ultrasonic rolling assembly 4 can transmit vibration to the workpiece to destroy the adsorption force between dust and the surface of the workpiece so that the air pump 5 can remove dust, the bottom of the mounting base 3 is fixedly connected with a connecting plate 8, and the upper surface of the connecting plate 8 is fixedly connected with a lubrication assembly 9.

[0048] Specifically, the ultrasonic rolling component 4 is driven by setting a horizontal driving base 1 so as to reset or move it and complete the rolling operation. The air pump 5, the lubrication component 9 and the ultrasonic rolling component 4 are respectively set to complete the dust removal, lubrication and rolling operations. The dust removal, lubrication and rolling operations are completed continuously. The workpiece does not need to be circulated, reducing the chance of it being contaminated with dust again. When the ultrasonic rolling component 4 completes the rolling operation, the vibration is transmitted to the workpiece, which can destroy the adsorption force between the dust and the workpiece surface, thereby improving the dust removal effect of the air pump 5.

[0049] A dust box 10 is fixedly connected to the back of the movable seat 2. The back of the dust box 10 is open, and a filter screen 11 is detachably connected to the inner wall of the dust box 10. An outlet pipe 12 is fixedly connected to the air outlet end of the air pump 5. One end of the outlet pipe 12 extends to the inner cavity of the dust box 10. The air pump 5 works in cooperation with the air inlet pipe 6, so that the dust on the surface of the workpiece passes through the wind hood 7, the air inlet pipe 6, and the air outlet pipe 12 into the dust box 10. The dust is removed and discharged under the filtering action of the filter screen 11, and the dust is trapped in the dust box 10 and collected for cleaning.

[0050] The ultrasonic rolling assembly 4 includes a clamp 401 fixedly connected to the front side of the mounting seat 3, and a transducer 402 is detachably connected to the clamp 401. One end of the transducer 402 is fixedly connected to a variable amplitude rod 403, and a rolling head 404 is arranged at the bottom end of the variable amplitude rod 403. A through hole for the variable amplitude rod 403 to pass through is provided on the upper surface of the connecting plate 8. Specifically, the clamp 401 is used to facilitate the installation of the ultrasonic rolling assembly 4. When in use, the transducer 402, the variable amplitude rod 403 and the rolling head 404 are placed in the clamp 401 and fixed, and then the clamp 401 is installed on the mounting seat 3. Among them, the transducer 402, the variable amplitude rod 403 and the rolling head 404 are all existing technologies. The function of the transducer 402 is to convert electrical energy into mechanical vibration energy of ultrasonic frequency, and the function of the variable amplitude rod 403 is to amplify the vibration amplitude output by the transducer 402.

[0051] A guide rail 13 is fixedly connected to the front side of the movable seat 2, the mounting seat 3 is slidably connected to the surface of the guide rail 13, the bottom end of the guide rail 13 is fixedly connected to a limit block 14, a cylinder 15 is fixedly connected to one side of the movable seat 2, the output end of the cylinder 15 is fixedly connected to a connecting seat 16, the connecting seat 16 is fixedly connected to one side of the mounting seat 3, the up and down movement of the mounting seat 3 is achieved through the guide rail 13, the limit block 14 is provided to prevent the mounting seat 3 from being separated from the guide rail 13, and the mounting seat 3 is driven to move up and down through the output end of the cylinder 15 to adapt to the thickness of the workpiece.

[0052] The lubrication assembly 9 is located between the wind hood 7 and the ultrasonic rolling assembly 4 to achieve a processing sequence of first dust removal, then lubrication, and finally rolling.

[0053] The lubrication assembly 9 includes a storage box 901 fixedly connected to the upper surface of the connecting plate 8, and a shell 902 is fixedly connected to the lower surface of the connecting plate 8. The shell 902 is communicated with the storage box 901, and the inner cavity of the shell 902 is provided with a rotating brush roller 903. The lubricating oil in the storage box 901 can flow to the surface of the brush roller 903 to oil the workpiece. A feed port is provided on the upper surface of the storage box 901, and a plug 904 is provided on the inner wall of the feed port. By providing the brush roller 903, the lubricating oil in the storage box 901 falls to the surface of the brush roller 903. As the brush roller 903 rotates along the surface of the workpiece, the lubricating oil is coated on the surface of the workpiece to achieve automatic lubrication to reduce the wear of the rolling head 404, wherein, under normal conditions, the rolling height is lower than the height of the rolling head 404.

[0054] A slide groove is provided on the side of the outer shell 902, and a slider 905 is slidably connected to the inner wall of the slide groove, and the opposite surfaces of the two sliders 905 are fixedly connected to the same fixed shaft 906, and the brush roller 903 is rotatably connected to the surface of the fixed shaft 906. The upper surface of the slider 905 is fixedly connected to a pressure spring 907, and the top of the pressure spring 907 is fixedly connected to the lower surface of the connecting plate 8. By setting the slider 905 and the pressure spring 907, the brush roller 903 can maintain a fit with the workpiece under the action of the pressure spring 907, wherein, under normal conditions, the rolling height is lower than the height of the rolling head 404.

[0055] A flow channel 908 is formed at the bottom of the storage box 901, and an escape hole for the flow channel 908 to pass through is opened on the upper surface of the connecting plate 8. The flow channel 908 passes through the escape hole and extends to the inside of the shell 902. An oil filling hole 909 is opened at the bottom of the flow channel 908. The oil filling hole 909 is in the shape of a rectangular strip. An opening and closing block 910 is arranged in the oil filling hole 909. The cross section of the opening and closing block 910 is triangular. A spring seat 911 is fixedly connected to the upper surface of the opening and closing block 910. A sliding rod 912 is fixedly connected to the upper surface of the spring seat 911. The inner wall of the flow channel 908 is fixedly connected to a fixing plate 913. A sliding hole is opened on the upper surface of the fixing plate 913, and the sliding rod 912 is slidably connected to the inner wall of the sliding hole. Then, the surface of the sliding rod 912 is sleeved with an opening and closing spring 914, one end of the opening and closing spring 914 is fixedly connected to the spring seat 911, and the other end of the opening and closing spring 914 is fixedly connected to the fixed plate 913. A rounded corner 915 is provided at the bottom of the opening and closing block 910. By setting the opening and closing block 910, under normal conditions, the opening and closing spring 914 generates pressure on the spring seat 911, so that the opening and closing block 910 closes the oil filling hole 909 to prevent the lubricating oil from leaking. In the working state, the brush roller 903 lifts the opening and closing block 910 to open the oil filling hole 909 to allow the lubricating oil to flow out. By setting the rounded corner 915, when the brush roller 903 is operating and rotating, the rounded corner 915 can spread the lubricating oil evenly on the surface of the brush roller 903.

[0056] The horizontal driving base 1 includes a base 101, and two first electric slides 102 are fixedly connected to the upper surface of the base 101, and the output ends of the two first electric slides 102 are fixedly connected to the same second electric slide 103. The movable seat 2 is installed on the second electric slide 103, and the second electric slide 103 can drive the movable seat 2 to move. Through the two first electric slides 102, the ultrasonic rolling assembly 4 can be driven to move on the horizontal Y axis so as to drive the ultrasonic rolling assembly 4 to reset or drive the ultrasonic rolling assembly 4 to move along the rolling path. By setting the second electric slide 103, the ultrasonic rolling assembly 4 can be driven to move on the horizontal X axis so as to adjust the starting position of the ultrasonic rolling assembly 4.

[0057] Working principle: When the ultrasonic rolling equipment is used, first place the workpiece on the base 101 and use external tools to position it, then start the second electric slide 103 to drive the moving seat 2 to move, so that the ultrasonic rolling assembly 4 moves to the initial position, then start the cylinder 15, the output end of the cylinder 15 drives the connecting seat 16 to move downward, the moving seat 2 drives the mounting seat 3, and the mounting seat 3 drives the ultrasonic rolling assembly 4 to move downward, so that the rolling head 404 fits the workpiece, then start the ultrasonic rolling assembly 4 and the first electric slide 102, the first electric slide 102 drives the ultrasonic rolling assembly 4 to move to the front side to complete the rolling operation;

[0058] During this process, the air pump 5 is started at the same time. The air pump 5 works in cooperation with the air inlet pipe 6, so that the dust on the surface of the workpiece passes through the wind cover 7, the air inlet pipe 6, and the air outlet pipe 12 into the dust collecting box 10, and is discharged after dust removal under the filtering action of the filter 11, and the dust is trapped in the dust collecting box 10 for collection and cleaning. When the ultrasonic rolling component 4 completes the rolling operation, the vibration is transmitted to the workpiece, which destroys the adsorption force between the dust and the surface of the workpiece, thereby improving the dust removal effect of the air pump 5;

[0059] When the mounting seat 3 moves downward, the connecting plate 8 is driven to move downward, and the connecting plate 8 drives the lubrication assembly 9 to move downward, so that the brush roller 903 first contacts the workpiece. As the mounting seat 3 continues to move downward, the connecting plate 8 compresses the pressing spring 907, so that the opening and closing block 910 approaches the brush roller 903, until the brush roller 903 lifts the opening and closing block 910, so that the oil filling hole 909 is opened to allow the lubricating oil to flow out. As the first electric slide 102 drives the mounting seat 3 to move forward, the brush roller 903 applies the lubricating oil to the surface of the workpiece.

[0060] By arranging the air pump 5, the lubrication component 9 and the ultrasonic rolling component 4, the dust removal, lubrication and rolling operations are respectively completed, and the dust removal, lubrication and rolling operations are completed continuously. The workpiece does not need to be circulated, reducing the chance of it being contaminated with dust again.

[0061] Example 2

[0062] like Fig.10 As shown, a method for surface strengthening by superimposing alternating patterns based on ultrasonic rolling is characterized in that it includes the following steps:

[0063] S1. Matrix material pretreatment

[0064] The oxide film and oil stains in the damaged area of ​​45CrNiMoVA steel were removed by using 200-mesh, 400-mesh and 800-mesh sandpaper, and the surface was cleaned with anhydrous ethanol to show the damaged area.

[0065] S2. Powder design and preparation

[0066] The iron-based alloy powder is prepared by argon atomization. The weight ratio of each element in the iron-based alloy powder is: C 0.18%-0.24%, Ni 1.8%-2.5%, Cr 17%-18.5%, Mn 0.13%-0.25%, Si 1%-1.2%, B1.1%-1.4%, and the balance is iron. The powder particle size is 45-150μm, and the spherical powder is ≥90%.

[0067] S3. Use laser cladding technology to plan paths and prepare coatings on the substrate surface.

[0068] S4. Perform flaw detection and development on the coating surface to observe whether there are microcracks on the surface. If there are cracks, return to S3 to re-prepare the coating.

[0069] S5. Post-heat treatment is used to eliminate the residual stress between the coating and the substrate interface. The heat treatment temperature is 250℃±10℃ and the holding time is 2h.

[0070] S6. Mill the coating surface and ultrasonically roll the remanufactured coating that meets the standards to improve the surface integrity.

[0071] S7. Use the ultrasonic rolling equipment in Example 1 to perform ultrasonic rolling processing on the coating surface.

[0072] During ultrasonic rolling, the ultrasonic frequency is 28.5KHz, the rolling bead diameter is 15mm, the moving speed is 20mm / s, and the static load is 0.3MPa.

[0073] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. An ultrasonic rolling device, comprising a horizontal driving base (1) and a movable base (2) mounted on the horizontal driving base (1) and driven by the horizontal driving base (1), the front of the movable base (2) being slidably connected to a mounting base (3), the front of the mounting base (3) being fixedly connected to an ultrasonic rolling assembly (4), characterized in that: An air pump (5) is fixedly connected to the upper surface of the movable seat (2); an air inlet end of the air pump (5) is fixedly connected to an air inlet pipe (6); one end of the air inlet pipe (6) is fixedly connected to a wind hood (7); the wind hood (7) is located directly in front of the ultrasonic rolling assembly (4); the ultrasonic rolling assembly (4) can transmit vibration to the workpiece to destroy the adsorption force between dust and the surface of the workpiece so that the air pump (5) can remove dust; a connecting plate (8) is fixedly connected to the bottom of the mounting seat (3); a lubrication assembly (9) is fixedly connected to the upper surface of the connecting plate (8).

2. The ultrasonic rolling device according to claim 1, characterized in that: The back of the movable seat (2) is fixedly connected to a dust box (10), the back of the dust box (10) is open, and the inner wall of the dust box (10) is detachably connected to a filter screen (11), and the air outlet end of the air pump (5) is fixedly connected to an air outlet pipe (12), one end of the air outlet pipe (12) extends to the inner cavity of the dust box (10).

3. The ultrasonic rolling device according to claim 1, characterized in that: The ultrasonic rolling assembly (4) comprises a clamp (401) fixedly connected to the front of the mounting seat (3); a transducer (402) is detachably connected inside the clamp (401); one end of the transducer (402) is fixedly connected to a variable amplitude rod (403); a rolling head (404) is provided at the bottom end of the variable amplitude rod (403); and a through hole for the variable amplitude rod (403) to pass through is provided on the upper surface of the connecting plate (8).

4. The ultrasonic rolling device according to claim 1, characterized in that: The front side of the movable seat (2) is fixedly connected to a guide rail (13), the mounting seat (3) is slidably connected to the surface of the guide rail (13), the bottom end of the guide rail (13) is fixedly connected to a limit block (14), one side of the movable seat (2) is fixedly connected to a cylinder (15), the output end of the cylinder (15) is fixedly connected to a connecting seat (16), and the connecting seat (16) is fixedly connected to one side of the mounting seat (3).

5. The ultrasonic rolling device according to claim 1, characterized in that: The lubrication component (9) is located between the wind cover (7) and the ultrasonic rolling component (4).

6. A method for surface strengthening by superimposing alternating patterns based on ultrasonic rolling, characterized in that: The following steps are involved: S1. Pretreatment of substrate materials; S2. Powder design and preparation; S3. Plan the path and prepare the coating on the substrate surface using laser cladding technology; S4. Perform flaw detection and development on the coating surface to observe whether there are microcracks on the surface. If there are cracks, return to S3 to re-prepare the coating; S5. Post-heat treatment is used to eliminate the residual stress between the coating and the substrate interface. The heat treatment temperature is 250℃±10℃ and the holding time is 2h; S6. Mill the coating surface and ultrasonically roll the remanufactured coating that meets the standards to improve the surface integrity; S7. Use ultrasonic rolling equipment to perform ultrasonic rolling processing on the coating surface.

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