Magneto-rheological efficient polishing device with spherical magnetic field arranged in flow channel

Abstract

The invention discloses a magneto-rheological efficient polishing device with a spherical magnetic field arranged in a flow channel. The magneto-rheological efficient polishing device comprises a series spherical magnetic field generating device and a magneto-rheological fluid reciprocating supply system. According to the series spherical magnetic field generation device, a plurality of magnetic balls are connected in series through a flexible rope and then placed in a flow channel, a magnetic field generated by the magnetic balls enables magnetorheological fluid in reciprocating motion to generate a rheological effect, a flexible'magnetic brush 'is formed, the apparent viscosity is increased, abrasive particles are wrapped to scour the wall face, and material removal is achieved. Meanwhile, a local necking structure is formed at the magnetic ball, the circulation sectional area is reduced, a high-speed and high-pressure area is generated, the abrasive particle impact speed and updating frequency are increased, and the polishing efficiency is improved. The flexible series connection structure can penetrate through the complex inner flow channel in a self-adaptive mode, and the polishing requirement of the special-shaped component is met. Through the built-in magnetic field generating device and the necking effect, the polishing efficiency is cooperatively improved, and the problems that in an existing inner flow channel magneto-rheological polishing process, magnetic field attenuation is large, and an external device is difficult to be attached to a complex flow channel are solved.

Description

Technical Field

[0001] This invention relates to the field of ultra-precision machining equipment, and more specifically to a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel. Background Technology

[0002] With the development of modern industry, complex internal flow channel structures with high-quality internal surfaces are crucial in high-end manufacturing. For example, in the aerospace field, the surface quality of the internal flow channels in additively manufactured components such as turbine blades and fuel nozzles determines their fatigue performance and service reliability. Magnetorheological polishing (MRP) technology utilizes a magnetorheological fluid composed of magnetic particles and abrasive grains. A magnetic field causes the magnetic particles to form a flexible "magnetic brush" on the workpiece surface, increasing the viscosity of the magnetorheological fluid and carrying abrasive grains to scour the wall surface. It offers advantages such as good controllability and low surface damage, thus attracting significant attention in precision machining. However, existing MRP technologies still suffer from low processing efficiency and generally long polishing times. Especially when machining thick-walled or large-diameter flow channels, the magnetic field strength rapidly decreases with increasing distance, resulting in a weak magnetorheological effect inside the flow channel and uneven polishing quality. Furthermore, when multiple flow channels are closely arranged, it is impossible to place a magnetic field generator around the middle flow channel; and a fixed-shape magnetic field generator cannot conform to the outer surface of complex-shaped flow channels, making it difficult to construct a uniform and effective magnetic field inside the flow channel, further limiting polishing efficiency. Therefore, there is an urgent need to develop a magnetorheological polishing process with high polishing efficiency, efficient excitation of magnetorheological effect, and a magnetic field generating device that can adaptively fit the complex shape of the internal flow channel. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of low polishing efficiency, large magnetic field attenuation, and difficulty in fitting the complex flow channel contour of the prior art, and to provide a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel is characterized by comprising a series-connected spherical magnetic field generator, a magnetorheological fluid reciprocating supply system, a bent tube workpiece, and a worktable. The series-connected spherical magnetic field generator consists of multiple magnetic spheres, guide spheres, clamps, flexible ropes, and a motor with a winding reel. Each magnetic sphere has a through hole, and the flexible rope passes sequentially through the through holes of each sphere, connecting multiple spheres in series to form a flexible chain structure. Clamps are provided at both ends of the chain structure, and the clamps are fastened to the ends of the ropes through clamping and plastic deformation to achieve axial positioning of the magnetic sphere array. Guide spheres made of magnetically conductive material are provided at both ends of the flexible rope; their diameter is smaller than that of the magnetic spheres, and they can be used to pull the chain structure through the bent tube workpiece under the attraction of an external magnet. The motor with a winding reel has a spherical embedding hole, into which the guide sphere can be inserted and detachably connected to the motor to achieve motion control of the flexible rope.

[0006] The magnetorheological fluid reciprocating supply system consists of a cylinder, a Y-type connector, a material cylinder, and a T-type tee connector. All of the above components are mounted on the worktable assembly. Two symmetrically arranged cylinders serve as power sources, driving the magnetorheological fluid in the material cylinder to reciprocate in the inner channel through the Y-type connector. The horizontal coaxial ends of the T-type tee connector are respectively connected to one end of the material cylinder and one end of the inner channel of the workpiece. Its vertical branch end is provided with a perforated plug, and the flexible rope passes through the hole of the perforated plug.

[0007] Furthermore, when the reciprocating magnetorheological fluid flows through the magnetic microspheres, the magnetic microspheres form a localized necking structure in the flow channel, reducing the cross-sectional area of ​​the magnetorheological fluid flow, thereby forming a high-speed, high-pressure zone around the spheres and increasing the impact kinetic energy of the abrasive particles on the wall surface.

[0008] Furthermore, the magnetic spheres act as a magnetic field source, generating a high-gradient magnetic field within the polishing gap. This causes the magnetorheological fluid flowing across the sphere surface to undergo a rheological effect, forming a flexible "magnetic brush" with high shear stress, thereby removing material from the inner wall.

[0009] In the above technical solution, the shape-adaptive magnetorheological polishing excitation device based on a flexible array structure provided by the present invention has the following beneficial effects:

[0010] 1. This device uses ropes to connect magnetic spheres in series and embed them within the flow channel. The spheres' own magnetic fields act as an internal magnetic field generator, creating a high-intensity magnetic field within the polishing gap. This causes the magnetic particles in the flowing magnetorheological fluid to rapidly align into a chain-like structure, forming a flexible "magnetic brush." ​​This magnetic brush increases the local apparent viscosity of the magnetorheological fluid while simultaneously entraining abrasive particles to continuously shear the wall surface, achieving material removal from the inner surface.

[0011] 2. At the same time, the magnetic spheres form a localized constriction structure in the flow channel, which suddenly reduces the cross-sectional area of ​​the magnetorheological fluid. The pressure and velocity of the magnetorheological fluid flowing around the spheres increase rapidly, thereby increasing the impact speed and renewal frequency of the abrasive particles and improving polishing efficiency.

[0012] 3. The flexible rope enables the magnetic ball to adapt to various complex shapes of internal flow channels, providing the magnetic field strength required for polishing and meeting the needs of efficient and precise polishing of complex curved tubes, corner tubes, V-shaped tubes and other irregularly shaped components. Attached Figure Description

[0013] Figure 1 A perspective view of a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, provided in an embodiment of the present invention;

[0014] Figure 2 A diagram of a series spherical magnetic field generator for a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, provided for an embodiment of the present invention;

[0015] Figure 3 A structural diagram of a magnetorheological fluid reciprocating supply system for a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, provided in an embodiment of the present invention;

[0016] Figure 4 A schematic diagram of a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, provided in an embodiment of the present invention, showing the connection between a reel motor and a flexible rope;

[0017] Figure 5 A diagram of a flexible rope end guide ball structure for a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, provided in an embodiment of the present invention;

[0018] Figure 6 A schematic diagram of the series magnetic ball locking mechanism of a magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, provided in an embodiment of the present invention;

[0019] Figure label:

[0020] 1. Series-connected spherical magnetic field generator; 2. Magnetorheological fluid reciprocating supply system; 3. Bent pipe workpiece; 4. Workbench; 11. Magnetic ball; 12. Guide ball; 13. Clamp; 14. Flexible rope; 15. Motor with winding reel; 151. Embedded hole; 21. Cylinder; 22. Y-type connector; 23. Material cylinder; 24. T-type tee connector; 241. Plug with hole. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1 To be continued Figure 6 The present invention will now be described in further detail.

[0022] A magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel is characterized by comprising a series-connected spherical magnetic field generating device 1, a magnetorheological fluid reciprocating supply system 2, a bent tube workpiece 3, and a worktable 4. The series-connected spherical magnetic field generating device 1 consists of multiple magnetic balls 11, guide balls 12, clamps 13, flexible ropes 14, and a motor 15 with a winding reel. Each magnetic ball 11 has a through hole, and the flexible rope 14 passes through the through holes of each ball in sequence, connecting multiple balls in series to form a flexible chain structure. Clamps 13 are respectively provided at both ends of the chain structure, and the clamps 13 are fastened to the ends of the flexible ropes 14 by clamping and plastic deformation to achieve axial positioning of the magnetic ball array. Guide balls 12 made of magnetically conductive material are provided at both ends of the flexible ropes 14, with a diameter smaller than the magnetic balls 11, which can pull the chain structure through the bent tube workpiece 3 under the attraction of an external magnet. The motor 15 with a winding reel has a spherical insertion hole 151. The guide ball 12 can be inserted into the hole and detachably connected to the motor to realize the motion control of the flexible rope 14.

[0023] The magnetorheological fluid reciprocating supply system 2 consists of a cylinder 21, a Y-connector 22, a feed cylinder 23, and a T-connector 24, all of which are mounted on the worktable 4. Two symmetrically arranged cylinders 21 serve as a power source, driving the magnetorheological fluid in the feed cylinder 23 to reciprocate within the flow channel of the bent workpiece 3 via the Y-connector 22. The horizontal coaxial ends of the T-connector 24 are connected to the feed cylinder 23 and one end of the flow channel within the bent workpiece 3, respectively. Its vertical branch end is equipped with a perforated plug 241, through which the flexible rope 14 passes.

[0024] Furthermore, when the reciprocating magnetorheological fluid flows through the magnetic sphere 11, the magnetic sphere 11 forms a localized necking structure in the flow channel, reducing the cross-sectional area of ​​the magnetorheological fluid flow, thereby forming a high-speed, high-pressure zone around the sphere and increasing the impact kinetic energy of the abrasive particles on the wall surface.

[0025] Furthermore, the magnetic sphere 11 serves as a magnetic field source, generating a high-gradient magnetic field within the polishing gap. This causes the magnetorheological fluid flowing across the sphere's surface to undergo a rheological effect, forming a flexible "magnetic brush" with high shear stress, thereby achieving material removal from the inner wall.

[0026] The working process of this invention:

[0027] First, such as Figure 2 and Figure 6 As shown, one end of the flexible rope 14 is sequentially passed through the through holes of multiple magnetic balls 11 to form a series magnetic ball array, and axial positioning is achieved at both ends using clamping clamps 13 to ensure a fixed spacing between the balls. Subsequently, as... Figure 5As shown, a guide ball 12 is inserted into one end of the flexible rope 14, and clamping clamps 13 are installed on both sides to fix it. This end is placed at the entrance of the vertical branch of the T-shaped tee connector 24. An external magnet causes the guide ball 12 to pull the entire chain structure sequentially along the T-shaped tee connector 24, the bent pipe workpiece 3, and the other side of the T-shaped tee connector 24 until it smoothly passes through the complex internal flow channel of the bent pipe workpiece 3. After the series-connected magnetic ball array has completely entered the flow channel, the original guide ball 12 is cut off. Perforated plugs 241 are inserted into both ends of the flexible rope 14, and the perforated plugs 241 are installed at the vertical branch of the T-shaped tee connector 24. Finally, guide balls 12 are re-inserted into both ends of the flexible rope 14, and clamping clamps 13 are installed on both sides to fix it. The guide ball 12 is then embedded into the embedding hole 151 of the winding reel motor 15, completing the installation of the series-connected spherical magnetic field generator 1 (as shown). Figure 4 (As shown). The motor 15 with a winding reel can drive the flexible rope 14, causing the internal magnetic ball 11 to move slowly along the axis of the bent tube workpiece 3, thereby expanding the polishing area and improving the uniformity of the processing quality.

[0028] After completing the installation of the series-connected spherical magnetic field generator 1, start the magnetorheological fluid reciprocating supply system 2. For example... Figure 3 As shown, two symmetrically arranged cylinders 21 serve as power sources, coordinating with each other to drive two material cylinders 23 via a Y-connector 22. Initially, one material cylinder 23 is filled with magnetorheological fluid, while the other is empty. During operation, the cylinder 21 on the filled side pushes forward, forcing the magnetorheological fluid in that cylinder 23 into the flow channel of the bent workpiece 3 through a T-connector 24. Simultaneously, the cylinder 21 on the empty side pulls backward in the same direction, causing the push rod of that cylinder 23 to retract, creating negative pressure to assist in suction. After the magnetorheological fluid flows through all the magnetic balls 11, it flows into the empty material cylinder 23 from the T-connector 24 on the other side. When that cylinder 23 is full, the system automatically switches: the cylinder 21 on the pushing side changes to pulling backward, and the cylinder 21 on the pulling side changes to pushing forward, causing the magnetorheological fluid to flow back to the initial material cylinder 23. The system utilizes a dual-cylinder synchronous, unidirectional motion—one side pushing out while the other pulls back—to achieve smooth, reciprocating drive without compressed air interference. This reciprocating motion requires only a small amount of magnetorheological fluid for continuous circulation within a closed loop, eliminating the need for large-capacity fluid storage. Depending on the polishing process requirements, the magnetorheological fluid can be replaced periodically to ensure consistent processing results.

[0029] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel, characterized in that, The system includes a series-connected spherical magnetic field generator (1), a magnetorheological fluid reciprocating supply system (2), a bent tube workpiece (3), and a worktable (4). The series-connected spherical magnetic field generator (1) consists of multiple magnetic balls (11), guide balls (12), clamps (13), flexible ropes (14), and a motor with a winding reel (15). The magnetic balls (11) have through holes, and the flexible ropes (14) pass through the through holes of each ball in sequence, connecting multiple balls in series to form a flexible chain structure. The two ends of the chain structure are respectively provided with clamps (13), which are clamped to the ends of the flexible ropes (14) by clamping and plastic deformation. The two ends of the flexible ropes (14) are provided with guide balls (12) made of magnetic conductive material, the diameter of which is smaller than that of the magnetic balls (11). The motor with a winding reel (15) is provided with a spherical embedding hole (151), into which the guide balls (12) can be inserted and detachably connected to the motor. The magnetorheological fluid reciprocating supply system (2) consists of a cylinder (21), a Y-type connector (22), a material cylinder (23), and a T-type three-way connector (24). All of the above components are installed on the workbench (4). Two symmetrically arranged cylinders (21) serve as power sources, driving the magnetorheological fluid in the material cylinder (23) to reciprocate in the flow channel inside the bent tube workpiece (3) through the Y-type connector (22). The horizontal coaxial ends of the T-type three-way connector (24) are respectively connected to one end of the material cylinder (23) and one end of the flow channel inside the bent tube workpiece (3). A perforated plug (241) is provided at its vertical branch end, and the flexible rope (14) passes through the hole of the perforated plug (241).

2. The magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel according to claim 1, characterized in that, The magnetic sphere (11) forms a localized constriction structure in the flow channel to reduce the cross-sectional area of ​​the magnetorheological fluid, thereby forming a high-speed and high-pressure zone around the sphere and increasing the impact kinetic energy of the abrasive particles on the wall.

3. A magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel according to claim 1 or 2, characterized in that, The magnetic sphere (11) serves as a magnetic field generating device 2, generating a high gradient magnetic field within the polishing gap. This causes the magnetorheological fluid flowing across the surface of the sphere to undergo a rheological effect, forming a flexible "magnetic brush" with high shear stress, thereby removing material from the inner wall.

4. The magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel according to claim 1, characterized in that, The guide ball (12) can pull the chain structure through the complex inner flow channel of the bent tube workpiece (3) under the attraction of an external magnet; the motor (15) with a winding reel is detachably connected to the flexible rope (14) through the guide ball (12) and is used to drive the magnetic ball (11) to move along the axial direction of the bent tube workpiece (3) during the polishing process, so as to expand the polishing area and improve the processing uniformity.

5. The magnetorheological high-efficiency polishing device with a built-in spherical magnetic field in the flow channel according to claim 1, characterized in that, The magnetorheological fluid reciprocating supply system (2) adopts a dual-cylinder (21) alternating drive mode. When one cylinder (21) pushes the magnetorheological fluid into the flow channel, the other cylinder (21) pulls synchronously in the same direction, so that the magnetorheological fluid reciprocates in the closed loop.

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