Magnetic particle grinding device with shot peening and polishing functions

Abstract

This invention relates to the field of magnetic particle abrasive technology, specifically to a magnetic particle abrasive device that combines shot peening and polishing functions. It primarily addresses the shortcomings of existing technologies, such as high equipment costs and low efficiency due to the inability to integrate shot peening and polishing functions, as well as the inapplicability of existing shot peening and polishing devices to long pipelines. The device includes a reciprocating linear drive pair, a magnetic field generating assembly, and a planetary clamp. The magnetic field generating assembly includes a fixed ring and multiple electromagnets. The planetary clamp includes a support frame, a planetary carrier, a sun gear, planetary gears, an internal gear ring, a drive component, and a locking component. This device completes shot peening or polishing through the movement of the pipeline relative to the magnetic particle structure, avoiding constraints such as fluid pressure and space, making it suitable for processing long pipelines. Simultaneously, this device combines shot peening and polishing functions, eliminating the need for pipeline transfer between work sections and reducing the number of equipment required, thereby effectively reducing equipment costs and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of magnetic particle grinding technology, and in particular to a magnetic particle grinding device that combines shot peening and polishing functions. Background Technology

[0002] The quality of a pipeline's internal surface (e.g., roughness, contact stiffness, wear resistance, corrosion resistance) and microcracks generated during processing significantly impact its performance and lifespan. Poor internal surface quality exacerbates wear, affects transportation stability, reduces fatigue strength, shortens lifespan, and increases economic losses. Microcracks, influenced by the combined effects of the working fluid and environment (such as the high-pressure, high-flow environment of long-distance pipelines), easily lead to stress concentration, potentially causing rupture, leakage, or even explosion, threatening personal safety and the environment. Shot peening can harden the surface, improving the fatigue strength and residual stress of the pipeline's inner wall, preventing stress concentration cracks, and enhancing the pipeline's wear resistance. Polishing removes oxide scale and microcracks generated during processing from the pipeline's inner surface, preventing stress concentration at these locations and improving the pipeline's corrosion resistance. The combination of shot peening and polishing effectively improves the aforementioned defects.

[0003] In existing technologies, shot peening and polishing are two separate processes, requiring the pipeline to be shot peened first and then polished. This approach suffers from drawbacks such as high equipment costs and low efficiency due to inter-process transfers and equipment purchases. Furthermore, existing shot peening and polishing equipment is generally only suitable for shorter pipelines due to insufficient fluid pressure and space constraints, and cannot be applied to the processing of longer pipelines.

[0004] Therefore, there is an urgent need for a magnetic particle grinding device that combines shot peening and polishing functions and can be applied to longer pipelines. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, such as high equipment cost and low working efficiency due to the inability to integrate shot peening and polishing functions, as well as the inability of existing shot peening and polishing devices to be applied to long pipelines, this invention provides a magnetic particle grinding device that combines shot peening and polishing functions.

[0006] The magnetic particle abrasive device that combines shot peening and polishing functions provided by the present invention includes:

[0007] The reciprocating linear drive pair has two sets, and the linear trajectories of the two sets of reciprocating linear drive pairs are connected and collinearly arranged.

[0008] A magnetic field generating component is located between two sets of reciprocating linear drive pairs. The magnetic field generating component includes a fixed ring, the axis of which is parallel to the output direction of the reciprocating linear drive pairs. Multiple electromagnets are evenly distributed around the fixed ring.

[0009] A planetary clamp, comprising two units mounted on the output sections of two sets of reciprocating linear drive pairs, includes a support frame, a planetary carrier, a sun gear, planetary gears, an internal gear ring, a drive component, and a locking component. The support frame is connected to the output section of the corresponding reciprocating linear drive pair. The planetary carrier is rotatably mounted on the support frame, and the sun gear is rotatably mounted at the center of the planetary carrier. The rotation axes of the planetary carrier and the sun gear coincide with the axis of the fixed ring. Multiple planetary gears are provided and mounted on the edge of the planetary carrier. Each planetary gear meshes with the sun gear and corresponds to a multiple electromagnet. A positioning part for positioning the end of a pipe is fixed to one axial side of each planetary gear. The internal gear ring meshes with multiple planetary gears. The drive component is connected to the internal gear ring to drive its rotation. The locking component is located on the support frame and / or the planetary carrier and has a locking state that fixes the planetary carrier relative to the support frame and a clearance state that allows the planetary carrier to rotate freely relative to the support frame. The positioning parts of the two sets of planetary clamps are arranged opposite each other.

[0010] Optionally, the reciprocating linear drive pair includes:

[0011] Base;

[0012] The screw, with both ends rotatably mounted on the base;

[0013] The guide rod has both ends fixed to the base and parallel to the screw;

[0014] A stepper motor, the housing of which is connected to the base;

[0015] A coupling, one end of which is connected to the output shaft of the stepper motor and the other end of which is connected to the screw;

[0016] The support frame is screwed onto the screw rod and slidably sleeved onto the guide rod, and the fixing ring is located between the bases of the two sets of reciprocating linear drive pairs.

[0017] Optionally, the support frame includes a base frame and a support rod, the support rod being coaxially arranged with the planetary carrier and located on one axial side of the planetary carrier, and the support rod being rotatably connected to the planetary carrier via a first bearing.

[0018] Optionally, mounting rods extend axially to the other side from both the center and edge of the planetary carrier, and multiple mounting rods are provided at the edge of the planetary carrier corresponding to the planetary gears. The sun gear and planetary gears are both mounted on the corresponding mounting rods via second bearings.

[0019] Optionally, the mounting rod has a shoulder and a nut screwed to its free end. The inner holes of the sun gear and planet gear both have shoulders. The ends of the sun gear away from the support rod and the ends of the planet gears away from the support rod are fixed with covers. The covers extend towards the second bearing with a retaining ring. The inner ring of the second bearing is positioned on both sides by the shoulder and the nut, and the outer ring of the second bearing is positioned on both sides by the shoulder and the retaining ring.

[0020] Optionally, the positioning part is a boss fixed on the corresponding cover, and the positioning part of one planetary clamp is frustum-shaped, while the positioning part of the other planetary clamp is cylindrical.

[0021] Optionally, the locking element is a flip pin provided on the planetary carrier. When the flip pin is flipped to be parallel to the planetary carrier, it is set to the gap between the planetary carrier and the base frame to switch to the avoidance state. When the flip pin is flipped to be perpendicular to the planetary carrier, it blocks one side of the base frame to switch to the locking state.

[0022] Optionally, the planetary carrier and the internal gear ring are rotatably connected by a third bearing, and the inner ring of the third bearing is fixedly connected to the planetary carrier by a first connecting piece, and the outer ring of the third bearing is fixedly connected to the internal gear ring by a second connecting piece.

[0023] Optionally, the internal gear ring is further provided with external teeth, and the driving component includes a servo motor and a driving gear. The housing of the servo motor is fixed on the support frame, and the driving gear is sleeved on the output shaft of the servo motor and meshes with the external teeth.

[0024] Optionally, the magnetic particle abrasive device that combines shot peening and polishing functions also includes a magnetic particle structure, which includes a magnetic needle and a grinding phase;

[0025] The magnetic needle is manufactured by selective laser melting. The magnetic needle consists of a cylindrical body and a plurality of convex ribs evenly distributed along the circumference of the cylindrical body. Each convex rib extends along the axial direction of the cylindrical body, and the two ends of the convex rib are aligned with the two ends of the cylindrical body.

[0026] The grinding phase is diamond particles, and the grinding phase is attached to the surface of the magnetic needle by an electroplating process.

[0027] The technical solution provided by this invention has the following advantages compared with the prior art:

[0028] 1) The magnetic particle grinding device with shot peening and polishing functions provided by the present invention clamps and fixes the two ends of the pipe with two planetary clamps, and drives the planetary clamps and the pipe as a whole to move synchronously through two sets of reciprocating linear drive pairs. This causes the magnetic particle structure in the pipe to move relative to the pipe under the action of the magnetic particles of the magnetic field generating component, thereby realizing shot peening or polishing. This can avoid the constraints of fluid pressure, space and other factors, and is suitable for processing longer pipes.

[0029] 2) The magnetic particle abrasive device combining shot peening and polishing functions provided by this invention, when the locking mechanism is switched to the avoidance state, allows the planetary clamp to drive the pipeline to rotate on its own axis while revolving around the sun gear. Combined with the alternating energization of the electromagnets in the magnetic field generating component and the linear motion of the pipeline, the magnetic particle structure impacts the inner wall of the pipeline in a disordered trajectory, thus completing the shot peening process. When the locking mechanism is switched to the locked state, the planetary clamp only drives the pipeline to rotate on its own axis. Combined with the full energization of the electromagnets in the magnetic field generating component and the linear motion of the pipeline, the magnetic particle structure maintains contact with the inner wall of the pipeline in a helical trajectory, thus completing the polishing process. This device combines shot peening and polishing functions, eliminating the need for pipeline transfer between work sections and reducing the number of equipment required, thereby effectively reducing equipment costs and improving work efficiency. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the magnetic particle grinding device in an embodiment of the present invention;

[0033] Figure 2 This is an exploded view of the magnetic field generating component in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the clamping side of a planetary clamp in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram showing the clamping side of another planetary clamp in an embodiment of the present invention;

[0036] Figure 5 This diagram illustrates the opposite clamping sides of the planetary clamp in an embodiment of the present invention.

[0037] Figure 6 This is an exploded view of the planetary clamp in an embodiment of the present invention;

[0038] Figure 7 This is a cross-sectional view of the planetary clamp in an embodiment of the present invention;

[0039] Figure 8 This diagram illustrates the mounting structure of the locking element in an embodiment of the present invention.

[0040] Figure 9 This is a schematic diagram showing the magnetic particle structure in an embodiment of the present invention.

[0041] In the picture:

[0042] 1. Reciprocating linear drive pair; 11. Base; 12. Screw; 13. Guide rod; 14. Stepper motor; 15. Coupling; 2. Magnetic field generating assembly; 21. Fixing ring; 22. Electromagnet; 23. Connecting frame; 24. Extension plate; 3. Planetary clamp; 31. Support frame; 311. Base frame; 312. Support rod; 313. First bearing; 32. Planetary carrier; 321. Mounting rod; 322. Second bearing; 3 23. Nut; 33. Sun gear; 34. Planetary gear; 341. Positioning part; 342. Cover; 343. Retaining ring; 35. Internal gear ring; 351. External gear; 36. Driving component; 361. Servo motor; 362. Drive gear; 37. Locking component; 38. Third bearing; 381. First connecting piece; 382. Second connecting piece; 4. Magnetic particle structure; 41. Cylindrical body part; 42. Raised rib; 100. Pipe. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0044] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0046] The following is combined Figures 1 to 9 Specific embodiments of the present invention will be described in detail below.

[0047] This embodiment provides a magnetic particle grinding device that combines shot peening and polishing functions, including a reciprocating linear drive pair 1, a magnetic field generating component 2, and a planetary clamp 3.

[0048] Among them, there are two sets of reciprocating linear drive pairs 1, and the linear trajectories of the two sets of reciprocating linear drive pairs 1 are connected and collinearly arranged.

[0049] It is easy to understand that since the magnetic field generating component 2 is located between the two sets of reciprocating linear drive pairs 1, and the planetary clamp 3 is located on the reciprocating linear drive pairs 1 and is used to clamp the end of the pipe 100, the magnetic field generating component 2 can only be guaranteed to act on the entire length range of the pipe 100 when the straight trajectories of the two sets of reciprocating linear drive pairs 1 are connected.

[0050] like Figure 1 As shown, the reciprocating linear drive pair 1 includes a base 11, a screw 12, a guide rod 13, a stepper motor 14, and a coupling 15. Both ends of the screw 12 are rotatably mounted on the base 11; both ends of the guide rod 13 are fixed to the base 11 and parallel to the screw 12; the housing of the stepper motor 14 is connected to the base 11; one end of the coupling 15 is connected to the output shaft of the stepper motor 14, and the other end is connected to the screw 12. In use, the planetary clamp 3 is screwed onto the screw 12 and slidably sleeved onto the guide rod 13. When the output shaft of the stepper motor 14 rotates, it drives the planetary clamp 3 to translate along the guide rod 13. This structure offers high precision and is more conducive to meeting the structural layout requirements of two sets of reciprocating linear drive pairs 1. Of course, the reciprocating linear drive pair 1 can also use a linear slide or other commonly used linear power components.

[0051] In this reciprocating linear drive pair 1, the number of guide rods 13 is not limited, for example... Figure 1 Two guide rods 13 are provided and located on both sides of the screw 12, which makes the planetary clamp 3 run more smoothly.

[0052] In this reciprocating linear drive pair 1, the structure of the coupling 15 is not limited. For example, in this embodiment, the coupling 15 includes a left coupling, a right coupling, and a spline. The left coupling and the right coupling are circumferentially limited by the spline, and the left coupling is clamped and fixed on the screw 12, while the right coupling is clamped and fixed on the output shaft of the stepper motor 14, thus realizing the transmission of torque.

[0053] The magnetic field generating component 2 is located between the two sets of reciprocating linear drive pairs 1. The magnetic field generating component 2 includes a fixed ring 21. The axis of the fixed ring 21 is parallel to the output direction of the reciprocating linear drive pairs 1. Multiple electromagnets 22 are evenly distributed along the circumference of the fixed ring 21.

[0054] like Figure 1 and Figure 2 As shown, the bottom end of the retaining ring 21 is provided with a connecting bracket 23, which is fixed between the bases 11 of the two sets of reciprocating linear drive pairs 1 by fasteners. Of course, the retaining ring 21 can also be fixed by a snap-fit ​​or other commonly used connection structure.

[0055] like Figure 2 As shown, the retaining ring 21 has multiple mounting holes evenly distributed circumferentially, and the axis of each mounting hole extends radially along the retaining ring 21. The electromagnet 22 is inserted into the mounting hole and fixed to the retaining ring 21 by an extension piece 24 located at the end of the electromagnet 22. This structure is convenient to install and can be disassembled, facilitating the maintenance and replacement of the electromagnet 22. Of course, the electromagnet 22 can also be fixed using a snap-fit ​​or other commonly used connection structure.

[0056] The number of electromagnets 22 is not limited, for example Figure 2 There are four electromagnets in the middle 22.

[0057] The planetary clamp 3 comprises two units, each mounted on the output section of one of the two sets of reciprocating linear drive pairs 1. The planetary clamp 3 includes a support frame 31, a planet carrier 32, a sun gear 33, planet gears 34, an internal gear ring 35, a drive component 36, and a locking component 37. The support frame 31 is connected to the output section of the corresponding reciprocating linear drive pair 1. The planet carrier 32 is rotatably mounted on the support frame 31. The sun gear 33 is rotatably mounted at the center of the planet carrier 32. The rotation axes of both the planet carrier 32 and the sun gear 33 coincide with the axis of the fixed ring 21. Multiple planet gears 34 are provided and mounted on the planet carrier. At the edge of 32, multiple planetary gears 34 mesh with sun gears 33 and correspond one-to-one with multiple electromagnets 22. A positioning part 341 for positioning the end of pipe 100 is fixed on one axial side of the planetary gears 34. An internal gear ring 35 meshes with multiple planetary gears 34. A drive member 36 is connected to the internal gear ring 35 to drive the internal gear ring 35 to rotate. A locking member 37 is provided on the support frame 31 and / or planetary carrier 32 and has a locking state that fixes the planetary carrier 32 relative to the support frame 31 and a clearance state that allows the planetary carrier 32 to rotate freely relative to the support frame 31. The positioning parts 341 of the two sets of planetary clamps 3 are arranged opposite each other.

[0058] like Figures 3 to 6 As shown, based on the aforementioned reciprocating linear drive pair 1, the support frame 31 has a screw hole for screwing onto the screw rod 12, and the support frame 31 also has two light holes for slidingly fitting onto the two guide rods 13.

[0059] like Figure 5 and Figure 6 As shown, the support frame 31 includes a base frame 311 and a support rod 312. The support rod 312 is coaxially arranged with the planetary carrier 32 and located on one side of the axial direction of the planetary carrier 32. The support rod 312 and the planetary carrier 32 are rotatably connected by a first bearing 313. The first bearing 313 ensures the stability of the rotation of the planetary carrier 32.

[0060] like Figure 7 As shown, a mounting groove is provided on one axial side of the planetary carrier 32. The mounting groove is a stepped groove. The first bearing 313 is fitted into the mounting groove. One side of the inner ring of the first bearing 313 is positioned by the shoulder of the support rod 312, and one side of the outer ring of the first bearing 313 is positioned by the stepped surface of the mounting groove, while the other side is positioned by an elastic retaining ring. It should be noted that if the other side of the inner ring of the first bearing 313 is positioned by a blocking member, the first bearing 313 needs to be installed on the support rod 312 by the shoulder of the support rod 312 and the blocking member before being inserted into the mounting groove as a whole. However, this operation will prevent the elastic retaining ring from being installed. Therefore, in this embodiment, the other side of the inner ring of the first bearing 313 is not positioned. In actual design, a deep groove ball bearing can be selected as the first bearing 313 to withstand a certain axial force.

[0061] like Figure 6 As shown, mounting rods 321 extend axially to the opposite side from both the center and edge of the planetary carrier 32. Multiple mounting rods 321 at the edge of the planetary carrier 32 correspond to the planetary gears 34. The sun gear 33 and planetary gears 34 are both mounted on their respective mounting rods 321 via second bearings 322. Firstly, the second bearings 322 ensure the stability of the rotation of the sun gear 33 and planetary gears 34. Secondly, the mounting rods 321 and support rods 312 are located on opposite axial sides of the planetary carrier 32, resulting in a more rational spatial arrangement and effectively preventing structural interference.

[0062] It should be noted that since the pipe 100 is fixed by the positioning part 341 on the planetary gear 34, the pipe 100 and the planetary gear 34 are correspondingly set. Designing the number of planetary gears 34 to be equal to the number of electromagnets 22 and having them correspond one-to-one during polishing ensures that each magnetic particle structure 4 of the pipe 100 has a corresponding electromagnet 22 to provide magnetic force, thereby ensuring the polishing effect.

[0063] like Figure 6 and Figure 7As shown, the mounting rod 321 has a shoulder and a nut 323 is screwed to its free end. Both the inner bore of the sun gear 33 and the inner bore of the planet gear 34 have shoulders. A retaining cover 342 is fixed to the end of the sun gear 33 away from the support rod 312 and the end of the planet gear 34 away from the support rod 312. A retaining ring 343 extends from the retaining cover 342 toward the second bearing 322. The inner ring of the second bearing 322 is positioned on both sides by the shoulder and the nut 323, and the outer ring of the second bearing 322 is positioned on both sides by the shoulder and the retaining ring 343. This positioning structure of the second bearing 322 is easy to assemble and disassemble and has high reliability.

[0064] In the positioning structure of the second bearing 322, the method of fixing the cover 342 to the sun gear 33 or planet gear 34 is not limited, for example... Figure 6 The cover 342 shown is fixed to the side wall of the sun gear 33 or planet gear 34 by bolts.

[0065] like Figure 3 and Figure 4 As shown, the positioning part 341 is a boss fixed on the corresponding cover 342, and the positioning part 341 of one planetary clamp 3 is frustum-shaped, while the positioning part 341 of the other planetary clamp 3 is cylindrical. The diameter of the middle position of the waist of the frustum-shaped positioning part 341 should be equal to the inner diameter of the pipe 100 to act as a center point, thereby enabling the pipe 100 to be centered; the diameter of the cylindrical positioning part 341 should be equal to the inner diameter of the pipe 100 so that it can fit inside the pipe 100 and clamp the pipe 100 in conjunction with the frustum-shaped positioning part 341. Of course, the positioning part 341 can also be an annular groove for accommodating the end of the pipe 100.

[0066] It should be noted that the connection method between the cover 342 and the positioning part 341 located on the planetary gear 34 is not limited, for example... Figure 6 and Figure 7 In this design, the cover 342 and the positioning part 341 located on the planetary gear 34 are integrally formed. Of course, the cover 342 and the positioning part 341 located on the planetary gear 34 can also be separately installed and fixedly connected.

[0067] like Figure 5 , Figure 7 and Figure 8 As shown, the locking element 37 is a flip pin provided on the planetary carrier 32. When the flip pin is flipped to be parallel to the planetary carrier 32, it is set to the gap between the planetary carrier 32 and the base frame 311 to switch to the clearance state. When the flip pin is flipped to be perpendicular to the planetary carrier 32, it blocks one side of the base frame 311 to switch to the locking state. In use, the flip pin can be manually flipped.

[0068] like Figure 6 and Figure 7As shown, the planetary carrier 32 and the internal gear ring 35 are rotatably connected by a third bearing 38. The inner ring of the third bearing 38 is fixedly connected to the planetary carrier 32 via a first connecting piece 381, and the outer ring of the third bearing 38 is fixedly connected to the internal gear ring 35 via a second connecting piece 382. The third bearing 38 ensures the stability of the rotation of the internal gear ring 35.

[0069] like Figure 3 and Figure 4 As shown, the internal gear ring 35 also has external teeth 351. The driving component 36 includes a servo motor 361 and a drive gear 362. The housing of the servo motor 361 is fixed on the support frame 31, and the drive gear 362 is sleeved on the output shaft of the servo motor 361 and meshes with the external teeth 351. During operation, the output shaft of the servo motor 361 rotates, driving the drive gear 362 to rotate, thereby driving the internal gear ring 35 to rotate through the external teeth 351. Of course, the internal gear ring 35 can also be driven to rotate through a synchronous belt mechanism or other commonly used structures.

[0070] It is easy to understand that the sun gear 33, planet gear 34, and internal gear ring 35 are all spur gears with the same module, and their tooth counts satisfy the following formula:

[0071] ;

[0072] in, This refers to the number of teeth on the internal gear ring (35). This refers to the number of teeth on the sun gear (33). This refers to the number of teeth on planetary gear 34. The number of planetary gears is 34. It is an integer.

[0073] Formula (1) is used to ensure that the meshing center distance is consistent, thereby ensuring that the sun gear 33, planet gear 34 and internal gear ring 35 mesh correctly and that there is no jamming in the transmission process; Formula (2) is used to ensure that multiple planet gears 34 are evenly distributed on the planet carrier 32 and do not interfere with each other, thereby achieving stable and efficient power transmission.

[0074] like Figure 9 As shown, the magnetic particle abrasive device that combines shot peening and polishing functions also includes a magnetic particle structure 4. The magnetic particle structure 4 includes a magnetic needle and a grinding phase. The magnetic needle is made by selective laser melting and consists of a cylindrical body 41 and multiple convex ribs 42 evenly distributed circumferentially along the cylindrical body 41. Each convex rib 42 extends axially along the cylindrical body 41, and the two ends of the convex rib 42 are aligned with the two ends of the cylindrical body 41. The grinding phase is diamond particles, which are attached to the surface of the magnetic needle by electroplating. The magnetic needle of this magnetic particle structure 4, composed of a cylindrical body 41 and convex ribs 42, has high structural strength; the grinding phase, being diamond particles, has high hardness and good grinding performance.

[0075] It is easy to understand that the magnetic particle structure 4 needs to be placed inside the pipe 100 during use, and is used to contact or impact the inner wall of the pipe 100 under the magnetic force generated by the magnetic field generating component 2.

[0076] It should be noted that the size of the magnetic particles should be designed according to the material and size of the pipe 100 to be processed. For example, in this embodiment, the pipe 100 to be processed is a stainless steel pipe with an inner diameter of 20 mm, a wall thickness of 5 mm, and a length of 10000 mm. The length of the selected magnetic particle structure 4 is 4 mm, the diameter of the cylindrical body part 41 is 0.7 mm, and the radial height of the convex rib 42 is 0.4 mm. This forms a short and thick magnetic particle structure 4, which has a larger impact range than a thin and long magnetic needle. This can avoid the magnetic needle breaking due to excessive impact force and the formation of impact pits on the inner wall of the pipe 100.

[0077] It should be noted that the laser melting process, or SLM, includes the following steps: 1) Selecting uniformly sized magnetic stainless steel alloy powder and weighing it; 2) Adding the weighed powder to the hopper of the SLM equipment, preheating the substrate to 300°C to 350°C, and performing SLM molding under the protection of an argon atmosphere to obtain a semi-finished product; 3) Removing unnecessary structures such as the support part of the semi-finished product and cutting it to the target size using electrical discharge machining; 4) Polishing the surface with sandpaper to obtain a magnetic needle.

[0078] The parameters involved in this laser melting process are as follows: laser power P is 350W-400W, preferably 400W; scanning speed v is 620mm / s-660mm / s, preferably 650mm / s; scanning spacing S is 110μm-120μm, preferably 110μm; scanning layer thickness h is 20μm-30μm, preferably 20μm; the scanning strategy adopts intra-layer grid reciprocating scanning, and the inter-layer scanning direction is rotated by 67°.

[0079] It should be noted that the electroplating process involves the following steps: a magnetic needle is placed in the electroplating bath as the cathode, nickel is used as the anode, and diamond particles are uniformly mixed in the electroplating solution. Under the action of current, nickel ions accumulate on the surface of the magnetic needle, thereby encapsulating and fixing the diamond particles.

[0080] The working principle of the magnetic particle abrasive device that combines shot peening and polishing functions in this embodiment is as follows:

[0081] During shot peening, the flipping pin is flipped to the avoidance state, and the internal gear ring 35 rotates under the drive of the servo motor 361, thereby driving the planetary gear 34 to rotate and revolve around the sun gear 33, which in turn drives the rotation and revolution of the pipe 100. At the same time, multiple electromagnets 22 are alternately energized. At a certain instant, all the magnetic particle structures 4 in the pipe 100 are attracted to one side. When the energized electromagnet 22 is switched, all the magnetic particle structures 4 in the pipe 100 are attracted to the other side. In this way, the magnetic particle structures 4 continuously impact and squeeze the inner wall of the pipe 100, thereby completing the shot peening within the range of the magnetic field generating device. In addition, the two sets of reciprocating linear drive pairs 1 move synchronously, driving the pipe 100 to move linearly, so that each section of the pipe 100 enters the range of the magnetic field generating device in sequence, thereby realizing the shot peening within the entire length of the pipe 100.

[0082] During polishing, the flip pin is flipped to the locked state, and the planetary carrier 32 remains fixed under the blocking action of the flip pin. The internal gear ring 35 rotates under the drive of the servo motor 361, thereby driving the planetary gear 34 to rotate, and in turn driving the pipe 100 to rotate. At the same time, all electromagnets 22 are energized, and the current direction and magnitude of all electromagnets 22 are consistent. The magnetic particle structure 4 in each pipe 100 is attracted to the magnetic pole direction of the corresponding electromagnet 22, and the two sets of reciprocating linear drive pairs 1 move synchronously, driving the pipe 100 to move linearly, so that each pipe segment of the pipe 100 enters the range of the magnetic field generating device in sequence, thereby causing the magnetic particle structure 4 to make a spiral motion relative to the pipe 100. Through the scratching of the inner wall of the pipe 100 by the magnetic particle structure 4, the polishing process is achieved within the entire length of the pipe 100.

[0083] It should be noted that the current flowing through the electromagnet 22 during shot peening should be greater than that during polishing, in order to generate a larger magnetic induction intensity, thereby enabling the magnetic particle structure 4 to exert a greater impact force on the inner wall of the pipe 100.

[0084] It is important to note that the sun gear 33 does not need to be fixed during shot peening. Since the planetary carrier 32 is in a free state and the magnetic particle structure 4 continuously impacts the inner wall of the pipe 100, the sun gear 33 and the internal gear ring 35 will not rotate synchronously while the planetary gear 34 does not revolve. The free state of the sun gear 33 further enhances the disordered movement of the magnetic particle structure 4, avoiding unprocessed or reworked areas due to overlapping transformation patterns, thus resulting in a better shot peening effect.

[0085] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A magnetic particle grinding device that combines shot peening and polishing functions, characterized in that, include: The reciprocating linear drive pair (1) has two sets, and the linear trajectories of the two sets of reciprocating linear drive pairs (1) are connected and collinearly arranged; A magnetic field generating component (2) is located between two sets of reciprocating linear drive pairs (1). The magnetic field generating component (2) includes a fixed ring (21). The axis of the fixed ring (21) is parallel to the output direction of the reciprocating linear drive pairs (1). Multiple electromagnets (22) are evenly distributed around the fixed ring (21). The planetary clamp (3) has two parts, which are respectively installed on the output parts of two sets of reciprocating linear drive pairs (1). The planetary clamp (3) includes a support frame (31), a planet carrier (32), a sun gear (33), planet gears (34), an internal gear ring (35), a drive component (36), and a locking component (37). The support frame (31) is connected to the output part of the corresponding reciprocating linear drive pair (1). The planet carrier (32) is rotatably mounted on the support frame (31). The sun gear (33) is rotatably mounted at the center of the planet carrier (32). The rotation axis of the planet carrier (32) and the rotation axis of the sun gear (33) are both coincident with the axis of the fixed ring (21). Multiple planet gears (34) are provided and are all installed on the planet carrier. At the edge of (32), multiple planetary gears (34) mesh with the sun gear (33) and correspond one-to-one with multiple electromagnets (22). A positioning part (341) for positioning the end of the pipe (100) is fixed on one axial side of the planetary gear (34). The internal gear ring (35) meshes with multiple planetary gears (34). The driving member (36) is connected to the internal gear ring (35) to drive the internal gear ring (35) to rotate. The locking member (37) is provided on the support frame (31) and / or the planetary carrier (32) and has a locking state that fixes the planetary carrier (32) relative to the support frame (31) and a clearance state that allows the planetary carrier (32) to rotate freely relative to the support frame (31). The positioning parts (341) of the two sets of planetary clamps (3) are arranged opposite to each other. The internal gear ring (35) is also provided with external teeth (351). The driving component (36) includes a servo motor (361) and a drive gear (362). The housing of the servo motor (361) is fixed on the support frame (31). The drive gear (362) is sleeved on the output shaft of the servo motor (361) and meshes with the external teeth (351).

2. The magnetic particle grinding device with both shot peening and polishing functions according to claim 1, characterized in that, The reciprocating linear drive pair (1) includes: Base (11); The screw (12) is rotatably mounted on the base (11) at both ends; The guide rod (13) has both ends fixed on the base (11) and parallel to the screw (12). A stepper motor (14) has its housing connected to the base (11); A coupling (15) is connected at one end to the output shaft of the stepper motor (14) and at the other end to the screw (12); The support frame (31) is screwed onto the screw (12) and slidably sleeved onto the guide rod (13), and the fixing ring (21) is located between the bases (11) of the two sets of reciprocating linear drive pairs (1).

3. The magnetic particle grinding device with both shot peening and polishing functions according to claim 1, characterized in that, The support frame (31) includes a base frame (311) and a support rod (312). The support rod (312) is coaxially arranged with the planetary carrier (32) and located on one side of the axial direction of the planetary carrier (32). The support rod (312) and the planetary carrier (32) are rotatably connected by a first bearing (313).

4. The magnetic particle grinding device with both shot peening and polishing functions according to claim 3, characterized in that, The planet carrier (32) has mounting rods (321) extending axially to the other side at both the center and the edge. Multiple mounting rods (321) at the edge of the planet carrier (32) are provided for the planet gears (34). The sun gear (33) and the planet gears (34) are both mounted on the corresponding mounting rods (321) through the second bearing (322).

5. The magnetic particle grinding device with both shot peening and polishing functions according to claim 4, characterized in that, The mounting rod (321) has a shoulder and a nut (323) screwed to its free end. The inner hole of the sun gear (33) and the inner hole of the planet gear (34) both have shoulders. The ends of the sun gear (33) away from the support rod (312) and the ends of the planet gear (34) away from the support rod (312) are both fixed with covers (342). The covers (342) extend with retaining rings (343) towards the side of the second bearing (322). The inner ring of the second bearing (322) is positioned on both sides by the shoulder and the nut (323), and the outer ring of the second bearing (322) is positioned on both sides by the shoulder and the retaining rings (343).

6. The magnetic particle grinding device with both shot peening and polishing functions according to claim 5, characterized in that, The positioning part (341) is a boss fixed on the corresponding cover (342), and the positioning part (341) of one planetary clamp (3) is frustum-shaped, while the positioning part (341) of the other planetary clamp (3) is cylindrical.

7. The magnetic particle grinding device with both shot peening and polishing functions according to claim 3, characterized in that, The locking element (37) is a flip pin provided on the planetary carrier (32). When the flip pin is flipped to be parallel to the planetary carrier (32), it is set to the gap between the planetary carrier (32) and the base frame (311) to switch to the avoidance state. When the flip pin is flipped to be perpendicular to the planetary carrier (32), it blocks one side of the base frame (311) to switch to the locking state.

8. The magnetic particle grinding device with both shot peening and polishing functions according to claim 1, characterized in that, The planetary carrier (32) and the internal gear ring (35) are rotatably connected by a third bearing (38), and the inner ring of the third bearing (38) is fixedly connected to the planetary carrier (32) by a first connecting piece (381), and the outer ring of the third bearing (38) is fixedly connected to the internal gear ring (35) by a second connecting piece (382).

9. The magnetic particle abrasive apparatus combining shot peening and polishing functions according to any one of claims 1 to 8, characterized in that, It also includes a magnetic particle structure (4), which comprises a magnetic needle and a grinding phase; The magnetic needle is made by selective laser melting process. The magnetic needle is composed of a cylindrical body (41) and a plurality of convex ribs (42) evenly distributed along the circumference of the cylindrical body (41). Each convex rib (42) extends along the axial direction of the cylindrical body (41), and the two ends of the convex rib (42) are aligned with the two ends of the cylindrical body (41). The grinding phase is diamond particles, and the grinding phase is attached to the surface of the magnetic needle by an electroplating process.

Images