Magnetorheological polishing device with inner wall

Abstract

The application discloses an inner wall magnetorheological polishing device, which is used for polishing the inner wall of a polishing piece and characterized by comprising a base, a polishing cavity arranged on the base, a first magnetic field generator arranged around the periphery of the polishing cavity, a polishing rotor arranged in the polishing cavity, a driving part arranged on the base and used for driving the polishing rotor to rotate, a second magnetic field generator arranged in the polishing rotor and opposite to the magnetic pole of the first magnetic field generator, and an axis of the polishing rotor and a rotation axis of the polishing rotor not coinciding with each other, wherein the polishing piece is fixed in the polishing cavity, a magnetorheological polishing liquid is arranged between the inner wall of the polishing piece and the polishing rotor, a partition plate is fixed in the polishing cavity, one end of the partition plate is in abutment with the inner wall of the polishing piece, and the other end of the partition plate is inserted into the polishing rotor. The application has the advantages that the concentration of abrasive particles acting on the polishing piece is greatly improved, the number of effective polishing abrasive particles is increased, and the polishing efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of polishing technology, and more specifically to an internal wall magnetorheological polishing device. Background Technology

[0002] Magnetorheological fluids (MRFs), as a novel type of smart material, can undergo reversible state transitions instantaneously: exhibiting a solid-like state under the influence of a magnetic field and a liquid state in the absence of a magnetic field. Based on this unique property, magnetorheological fluids have many applications, one of which is magnetorheological polishing (MRFF). MRFF is a flexible precision machining technique that can significantly improve the surface quality of workpieces after machining, is suitable for machining brittle and hard materials, and also improves material removal efficiency.

[0003] Existing magnetorheological polishers have simple structures, but they have low shear force and low polishing efficiency. They also suffer from the problem of edge effect of magnetorheological fluid affecting polishing quality. Magnetorheological fluid particles are thrown towards the outer diameter edge of the disc (plate) due to centrifugal force, causing the abrasive particles to separate from the magnetorheological fluid in the processing area. In addition, ordinary magnetorheological polishers operate under slip conditions, which causes the temperature of the magnetorheological fluid to rise, resulting in a decrease in the polishing performance of the polisher. Summary of the Invention

[0004] The purpose of this invention is to provide an inner wall magnetorheological polishing device that can effectively improve polishing efficiency and polishing precision.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A magnetorheological polishing device for polishing the inner wall of a workpiece is characterized by comprising a base, a polishing cavity disposed on the base, a first magnetic field generator surrounding the polishing cavity, a polishing rotor disposed within the polishing cavity, and a driving component disposed on the base for driving the polishing rotor to rotate. The polishing rotor contains a second magnetic field generator with magnetic poles opposite to those generated by the first magnetic field generator. The axis of the polishing rotor does not coincide with the rotation axis of the polishing rotor. The workpiece is fixed within the polishing cavity, and a magnetorheological polishing fluid is disposed between the inner wall of the workpiece and the polishing rotor. A partition plate is fixed within the polishing cavity, one end of which abuts against the inner wall of the workpiece, and the other end of which is inserted into the polishing rotor and slidably connected to it.

[0007] In the above-mentioned inner wall magnetorheological polishing device, the polishing rotor is provided with a rotating cavity, and a rotating component is provided in the rotating cavity. The other end of the partition plate is slidably connected to the rotating component.

[0008] In the above-mentioned inner wall magnetorheological polishing device, the rotating cavity has a notch that allows the other end of the partition plate to pass through towards the center of the polishing rotor.

[0009] In the above-mentioned inner wall magnetorheological polishing device, the outer wall of the polishing rotor is provided with eddy current polishing grooves that are uniformly distributed circumferentially, and the length direction of the eddy current polishing grooves is parallel to the axis of the polishing rotor.

[0010] In the above-mentioned inner wall magnetorheological polishing device, the cross-section of the eddy current polishing groove is arc-shaped.

[0011] In the above-mentioned inner wall magnetorheological polishing device, plugs are provided at both ends of the eddy current polishing groove along the axial direction of the polishing rotor.

[0012] In the above-mentioned inner wall magnetorheological polishing device, the polishing chamber is provided with an outlet and an inlet, which are located on both sides of the partition plate.

[0013] In the above-mentioned inner wall magnetorheological polishing device, there are multiple first magnetic field generators arranged in a ring, and a fixing member is provided between adjacent first magnetic field generators, the end of the fixing member abutting against the polishing part.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] Due to the eccentric design of the polishing rotor, a wedge-shaped space is formed between the rotor and the inner wall of the workpiece. A partition plate further divides this space into two parts. As the rotor rotates, the sizes of these two spaces continuously change, compressing the magnetorheological polishing fluid within. This alters the pressure exerted by the fluid on the workpiece, significantly increasing the concentration of abrasive particles and thus the effective number of polishing particles, thereby improving polishing efficiency. Furthermore, inserting the partition plate into the rotor prevents it from rotating on its own axis. When the rotor rotates around its axis, it generates greater pressure compared to a rotating rotor, compressing the magnetorheological polishing fluid to polish the inner wall of the workpiece.

[0016] Furthermore, the polishing rotor has a rotating cavity, and a rotating component is provided inside the rotating cavity. The other end of the partition plate is slidably connected to the rotating component. When the polishing rotor rotates, the partition plate is kept from detaching from the polishing rotor, and at the same time, the partition plate does not obstruct the rotation of the polishing rotor.

[0017] Furthermore, the rotating cavity has a notch that allows the other end of the partition plate to protrude towards the center of the polishing rotor. This provides the partition plate with a certain protruding position, preventing it from obstructing the rotation of the polishing rotor.

[0018] Furthermore, the outer wall of the polishing rotor is provided with vortex polishing grooves evenly distributed circumferentially, and the length direction of the vortex polishing grooves is parallel to the axis of the polishing rotor. The magnetorheological polishing fluid is squeezed from one side to the other along the inner wall of the vortex polishing groove, forming a magnetorheological vortex. A magnetic jet is formed on the squeezed side, impacting the inner wall of the polished part, thereby achieving a better polishing effect.

[0019] Furthermore, the cross-section of the eddy current polishing groove is arc-shaped, which better facilitates the formation of magnetorheological eddies.

[0020] Furthermore, plugs are provided at both ends of the eddy current polishing tank along the axial direction of the polishing rotor. This prevents the magnetorheological polishing fluid from overflowing from the top and bottom of the eddy current polishing tank, ensuring that the magnetorheological eddies can be squeezed out from the other side.

[0021] Furthermore, the polishing chamber is provided with an outlet and an inlet, which are located on opposite sides of the partition plate. The partition plate separates the inlet and outlet, allowing the magnetorheological polishing fluid to circulate within the polishing chamber before being ejected, thus fully utilizing the effect of the magnetorheological polishing fluid.

[0022] Furthermore, the first magnetic field generator comprises multiple units arranged in a ring, with fixing members positioned between adjacent units. The ends of these fixing members abut against the polished part. This arrangement aims to maintain the function of the first magnetic field generators while simultaneously securing the polished part with the fixing members. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the magnetorheological polishing device for the inner wall of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the magnetorheological polishing device for the inner wall of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of the magnetorheological polishing device for the inner wall of the present invention. Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the structure of the magnetorheological polishing device for the inner wall of the present invention. Figure 4 ;

[0027] Figure 5 for Figure 1 Sectional view of AA;

[0028] Figure 6 for Figure 3 Enlarged view of a section at point B in the middle;

[0029] Figure 7 This is a schematic diagram of the polishing rotor in this invention.

[0030] The attached figures are labeled as follows:

[0031] Polishing component 10, base 20, polishing cavity 21, partition plate 22, liquid outlet 23, liquid inlet 24, first magnetic field generator 30, polishing rotor 40, rotating cavity 41, cavity 42, rotating component 43, notch 44, eddy current polishing tank 45, plug 46, driving component 50, second magnetic field generator 60, magnetorheological polishing fluid 70, fixing component 80. Detailed Implementation

[0032] An inner wall magnetorheological polishing device is used to polish the inner wall of a polishing part 10. It is characterized by comprising a base 20, a polishing cavity 21 disposed on the base 20, a first magnetic field generator 30 surrounding the polishing cavity 21, a polishing rotor 40 disposed within the polishing cavity 21, and a driving component 50 disposed on the base 20 to drive the polishing rotor 40 to rotate. The polishing rotor 40 contains a second magnetic field generator 60 with magnetic poles opposite to those generated by the first magnetic field generator 30. The axis of the polishing rotor 40 does not coincide with its rotation axis. The polishing part 10 is fixed within the polishing cavity 21, and a magnetorheological polishing fluid 70 is disposed between the inner wall of the polishing part 10 and the polishing rotor 40. A partition plate 22 is fixed within the polishing cavity 21, one end of which abuts against the inner wall of the polishing part 10, and the other end of which is inserted into the polishing rotor 40.

[0033] Due to the eccentric arrangement of the polishing rotor 40, a wedge-shaped space is formed between the polishing rotor 40 and the inner wall of the polishing workpiece 10. This space is further divided into two parts by a partition plate 22. As the polishing rotor 40 rotates, the size of these two parts continuously changes, compressing the magnetorheological polishing fluid 70 within them. This causes a change in the pressure exerted by the magnetorheological polishing fluid 70 on the polishing workpiece 10, significantly increasing the abrasive concentration on the workpiece 10, thereby increasing the effective number of polishing abrasive grains and improving polishing efficiency. Furthermore, inserting the partition plate 22 into the polishing rotor 40 also prevents the polishing rotor 40 from rotating on its own axis. When the polishing rotor 40 rotates around its axis, it generates greater pressure compared to a rotating rotor 40, compressing the magnetorheological polishing fluid 70 to polish the inner wall of the polishing workpiece 10.

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] See Figures 1 to 7This is an embodiment of the magnetorheological polishing device for the inner wall of the present invention. The magnetorheological polishing device for the inner wall includes a base 20. A driving component 50 is fixed below the base 20. Generally, the driving component 50 is a driving motor. The motor shaft of the driving motor passes through the base 20 and extends upward. The motor shaft of the driving motor is connected to a turntable. An eccentric shaft is provided on the turntable. The eccentric shaft is connected to the polishing rotor 40, thereby achieving that the axis of the polishing rotor 40 does not coincide with the rotation axis of the polishing rotor 40.

[0036] In this embodiment, the polishing component 10 is cylindrical and stands on the base 20, with a sealed connection between the polishing component 10 and the base 20. The inner hole of the polishing component 10 forms a polishing cavity 21, and the axis of the polishing component 10 coincides with the motor shaft. The polishing rotor 40 is located inside the polishing cavity 21, and a second magnetic field generator 60 is provided inside the polishing rotor 40. A first magnetic field generator 30 is provided on the base 20 surrounding the polishing component 10. The polishing cavity 21 contains a magnetorheological polishing fluid 70, which is a mixture of magnetorheological fluid and polishing particles in a certain proportion. The specific mixing proportion and the size of the polishing particles can be determined according to the rotational speed of the polishing rotor 40 and the polishing precision, etc.

[0037] A partition plate 22 is also fixed inside the polishing chamber 21. One end of the partition plate 22 abuts against the inner wall of the polishing part 10, allowing for a sealed connection between the partition plate 22 and the inner wall of the polishing part 10. The other end of the partition plate 22 extends into the polishing rotor 40 and is slidably connected to it. The polishing rotor 40 rotates close to the inner wall of the polishing part 10. Due to the obstruction of the partition plate 22, the magnetorheological polishing fluid 70 in the polishing chamber 21 in the forward direction of the polishing rotor 40 is compressed, increasing its pressure and significantly increasing the concentration of abrasive particles acting on the polishing part 10. This increases the effective number of polishing abrasive particles and improves polishing efficiency. Furthermore, the partition plate 22 prevents the polishing rotor 40 from rotating, avoiding a decrease in the pressure of the magnetorheological polishing fluid 70 in the front polishing chamber 21 caused by a reduction in the rotor's rotation. Figure 5 As shown, a clearance groove can be opened on the partition plate 22, the side wall of the polishing part 10 is located in the clearance groove, the partition plate 22 is fixed on the base 20, and the partition plate 22 extends towards the center of the polishing rotor 40.

[0038] Furthermore, to prevent the partition plate 22 from obstructing the rotation of the polishing rotor 40, a rotating cavity 41 is provided inside the polishing rotor 40, and a rotating component 43 is provided inside the rotating cavity 41. The other end of the partition plate 22 is slidably connected to the rotating component 43. Specifically, a cavity 42 can be provided inside the polishing rotor 40, and a rotating cavity 41 with a circular cross-section can be provided inside the cavity 42. The rotating component 43 also has a circular cross-section, meaning that the rotating component 43 can rotate inside the rotating cavity 41. In this way, when the polishing rotor 40 rotates, the partition plate 22 can only perform linear motion and will not obstruct the rotation of the polishing rotor 40.

[0039] Furthermore, the rotating cavity 41 has a notch 44 that allows the other end of the partition plate 22 to pass through towards the center of the polishing rotor 40, which means that the other end of the partition plate 22 can extend into the cavity 42. This reduces the size of the rotating component 43 and the rotating cavity 41, so that they do not need to be made too large.

[0040] like Figure 3 , Figure 6 , Figure 7 As shown, in order to further improve the polishing effect, the outer wall of the polishing rotor 40 is provided with eddy current polishing grooves 45 evenly distributed in the circumferential direction. The polishing grooves are elongated and the length direction of the polishing grooves is parallel to the axis of the polishing rotor 40. When the polishing rotor 40 squeezes the magnetorheological polishing fluid 70, the magnetorheological polishing fluid 70 enters the eddy current polishing groove 45 to form eddies, which impact the inner wall of the polished part 10, thereby further improving the polishing effect.

[0041] The cross-section of the eddy current polishing tank 45 is arc-shaped, which can generate the best eddy current effect. Furthermore, along the axial direction of the polishing rotor 40, both ends of the eddy current polishing tank 45 are provided with plugs 46, that is, the two ends of the eddy current polishing tank 45 are not connected to the end face of the polishing rotor 40, thereby ensuring that the magnetorheological polishing fluid 70 entering the eddy current polishing tank 45 can generate eddies and will not leak out from both ends.

[0042] Based on the above embodiment, the polishing chamber 21 is provided with an outlet 23 and an inlet 24. The outlet 23 and the inlet 24 are located on both sides of the partition plate 22, so that the magnetorheological polishing fluid 70 needs to go through at least one turn before it can flow out of the outlet 23. Moreover, the outlet 23 and the inlet 24 are both connected to the storage tank, which is used to store the magnetorheological polishing fluid 70.

[0043] The first magnetic field generator 30 consists of multiple parts arranged in a ring. In this embodiment, four arc-shaped first magnetic field generators 30 are arranged in a ring. A gap is left between adjacent first magnetic field generators 30 for setting the fixing member 80. The end of the fixing member 80 abuts against the polishing part 10, which stabilizes the relative position of the polishing part 10 during the polishing process and prevents it from moving. The fixing member 80 can be fixedly connected to the base 20 with bolts.

[0044] When polishing is required, the polishing part 10 is fixed on the base 20, and magnetorheological polishing fluid 70 is injected into the polishing cavity 21 formed inside the polishing part 10. Then, the first magnetic field generator 30 and the second magnetic field generator 60 are activated. The first magnetic field generator 30 generates an S magnetic pole, and the second magnetic field generator 60 generates an N magnetic pole. Then, the drive unit 50 is activated, which drives the polishing rotor 40 to rotate. During the rotation, the polishing rotor 40 continuously squeezes the magnetorheological polishing fluid 70 in front of it, increasing the pressure of the magnetorheological polishing fluid 70. In addition, the eddy current generated on the eddy current polishing tank 45 further polishes the inner wall of the polishing part 10. The concentration of abrasive particles acting on the polishing part 10 is greatly increased, increasing the effective number of polishing abrasive particles and improving the polishing efficiency. After polishing is completed, the magnetorheological polishing fluid 70 flows out from the outlet 23 and is collected.

[0045] The above description is merely a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. An inner wall magnetorheological polishing device, used for polishing the inner wall of a workpiece, characterized in that, The device includes a base, a polishing cavity mounted on the base, a first magnetic field generator surrounding the polishing cavity, a polishing rotor located within the polishing cavity, and a drive unit located below the base to drive the polishing rotor to rotate. The polishing rotor contains a second magnetic field generator with the opposite magnetic pole to that generated by the first magnetic field generator. The axis of the polishing rotor does not coincide with the rotation axis of the polishing rotor. The polishing workpiece is fixed within the polishing cavity, and a magnetorheological polishing fluid is provided between the inner wall of the polishing workpiece and the polishing rotor. A partition plate is fixed within the polishing cavity. One end of the partition plate abuts against the inner wall of the polishing workpiece, and the other end of the partition plate is inserted into the polishing rotor and slidably connected to the polishing rotor. The driving component is a drive motor. The motor shaft of the drive motor extends upward through the base. The motor shaft of the drive motor is connected to a turntable. An eccentric shaft is provided on the turntable. The eccentric shaft is connected to the polishing rotor, thereby achieving that the axis of the polishing rotor does not coincide with the axis of rotation of the polishing rotor. The axis of the polished part coincides with the motor shaft; The polishing rotor has a cavity inside, and a rotating cavity with a circular cross-section is provided inside the cavity. A rotating component with a circular cross-section is provided inside the rotating cavity. The rotating component can rotate inside the rotating cavity. The other end of the partition plate is slidably connected to the rotating component.

2. The magnetorheological polishing apparatus for inner walls as described in claim 1, characterized in that, The rotating cavity has a notch that allows the other end of the partition plate to pass through towards the center of the polishing rotor.

3. The magnetorheological polishing apparatus for inner walls as described in claim 1, characterized in that, The outer wall of the polishing rotor is provided with vortex polishing grooves that are evenly distributed circumferentially, and the length direction of the vortex polishing grooves is parallel to the axis of the polishing rotor.

4. The magnetorheological polishing apparatus for inner walls as described in claim 3, characterized in that, The cross-section of the vortex polishing groove is arc-shaped.

5. The magnetorheological polishing apparatus for inner walls as described in claim 3, characterized in that, Both ends of the eddy current polishing tank are provided with plugs along the axial direction of the polishing rotor.

6. The magnetorheological polishing apparatus for inner walls as described in claim 1, characterized in that, The polishing chamber is provided with an outlet and an inlet, which are located on both sides of the partition plate.

7. The magnetorheological polishing apparatus for inner walls as described in claim 1, characterized in that, The first magnetic field generator consists of multiple parts arranged in a ring. A fixing member is provided between adjacent first magnetic field generators, and the end of the fixing member abuts against the polished part.

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