Permanent magnet type magneto-rheological fluid deceleration device based on magneto-rheological polishing and application thereof

Abstract

Provided is a permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing, comprising a magnetically conductive shell (1), a magnetorheological fluid conveying pipe (2), a fixed block (3) and a deceleration permanent magnet (4); the magnetically conductive shell (1) is a hollow cavity, and the upper and lower end faces have holes for connecting and fixing the fixed block (3) at corresponding positions; the fixed block (3) is a hollow tubular structure, and the two ends are connected to the top and bottom of the magnetically conductive shell (1) respectively; the magnetorheological fluid conveying pipe (2) is arranged in the fixed block (3) and penetrates the holes at the two ends of the magnetically conductive shell (1); the deceleration permanent magnet (4) comprises two identical blocks and is arranged in a mirror image on the outer periphery of the fixed block (3), and the polarization directions of the two deceleration permanent magnets (4) are both perpendicular to the axial direction of the magnetorheological fluid conveying pipe (2); the two deceleration permanent magnets (4) are both fixed in the following manner: one end is fixed to the inner wall of the magnetically conductive shell (1), and the other end is fixed to the outer wall of the fixed block (3).

Description

Technical Field

[0001] This invention relates generally to the fields of machining, advanced optical manufacturing and theoretical simulation technology, and in particular to a permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing and its application. Background Technology

[0002] With social development and continuous technological progress, the country's requirements for the performance of laser systems have gradually increased. This has placed higher demands on the processing level of internal components of laser systems. Traditional optical processing technology, due to its low precision and low efficiency, has been gradually replaced by modern optical processing technology.

[0003] Magnetorheological polishing, as a representative of modern optical processing technology, is widely used in the manufacturing process of optical components for laser systems. However, during the polishing process of optical components, problems such as liquid agitation and vibration of the magnetorheological fluid delivery pipeline, which cause vibration of the polishing ribbon, greatly affect the quality of the polished optical surface and ultimately affect the service performance of the optical components.

[0004] To address the issue of reduced optical surface quality caused by fluid agitation during magnetorheological polishing, there is an urgent need to develop new components to control magnetorheological fluid agitation and ultimately improve the surface quality of optical components. Summary of the Invention

[0005] This invention provides a permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing and its application. The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing can overcome the problem of reduced optical surface quality caused by pipeline fluctuations in existing magnetorheological polishing devices, realize stable delivery of magnetorheological fluid, and ultimately achieve stable improvement of the surface quality of optical components.

[0006] The technical solution of this invention is a permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing, comprising a magnetically conductive shell, a magnetorheological fluid delivery pipe, a fixed block, and a decelerating permanent magnet; the magnetically conductive shell is a hollow cavity with holes at corresponding positions on its upper and lower ends for connecting and fixing the fixed block; the fixed block is a hollow tube, with its two ends connected to the top and bottom of the magnetically conductive shell respectively, and communicating with the outside of the magnetically conductive shell through holes on the magnetically conductive shell; the magnetorheological fluid delivery pipe is disposed inside the fixed block and passes through the holes at both ends of the magnetically conductive shell; the decelerating permanent magnet comprises two identical pieces mirror-arranged on the outer periphery of the fixed block, and the polarization direction of both decelerating permanent magnets is perpendicular to the axial direction of the magnetorheological fluid delivery pipe.

[0007] Furthermore, the two deceleration permanent magnets are fixed in the following manner: one end is fixed to the inner wall of the magnetically conductive shell, and the other end is fixed to the outer wall of the fixing block.

[0008] Furthermore, the aforementioned magnetorheological fluid delivery tube is made of plastic and is used to deliver the magnetorheological fluid to the polishing tool head.

[0009] Furthermore, the aforementioned fixing block is made of a non-magnetic material, which is stainless steel and / or aluminum alloy.

[0010] Furthermore, the aforementioned deceleration permanent magnet is made of magnetic materials, including ferrite and / or neodymium iron boron.

[0011] Furthermore, the aforementioned magnetically conductive outer shell is formed from electrical pure iron material.

[0012] Furthermore, the aforementioned fixing block is a cylindrical hollow tube with a wall thickness of 2-6mm; the deceleration permanent magnet is a cuboid with a single-end arc, with one end connected to the fixing block being the arc end and the other end connected to the inner wall of the magnetically conductive shell; its bottom surface dimensions are 5mm×5mm.

[0013] Furthermore, the diameter of the magnetorheological fluid delivery pipe (2) is 6mm-10mm.

[0014] Furthermore, the inner diameter of the aforementioned fixing block (3) is 8mm-16mm.

[0015] The present invention also provides the application of the above-mentioned permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing. The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing is installed at any position on the path between the centrifugal pump and the magnetorheological polishing head. One end of the magnetorheological fluid delivery pipe is connected to the output port of the centrifugal pump, and the other end is connected to the input port of the polishing head.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing of the present invention mainly includes a magnetically conductive shell, a magnetorheological fluid conveying pipe, a fixed block and a deceleration permanent magnet. The deceleration permanent magnet generates a magnetic field at a predetermined position to cause the magnetorheological fluid conveyed in the magnetorheological fluid conveying pipe to achieve a certain liquid accumulation, thereby reducing the liquid jump. The device of the present invention has a simple structure and is easy to manufacture.

[0018] 2. The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing of the present invention, through the design of component materials, shapes, and connection relationships, can generate a weak magnetic field at a specific location in the magnetorheological conveying pipeline, forming a buffer and energy storage area for the magnetorheological fluid and reducing the adverse effects caused by magnetorheological fluid agitation. The present invention controls and influences the propagation direction of the magnetic field and the closure of the magnetic circuit in the device through the design of component connection relationships, thereby affecting the magnetic field strength at the conveying pipeline. Through the selection and design of component materials, the exciter affects the strength of the magnetic field source. The present invention aims to generate a weak magnetic field at the conveying pipeline, which requires that the magnetic field generated by the exciter cannot be too strong. Therefore, the type and grade of material are determined. At the same time, the material of the connecting accessories also affects the direction of the magnetic field, and its material must also be strictly limited. The present invention controls and influences the direction, closure, and strength of the magnetic field through component size design. In order to generate a weak magnetic field that meets the design requirements, reasonable dimensions need to be designed to generate a weak magnetic field at the conveying pipeline.

[0019] 3. The permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing of the present invention can be directly used in the magnetorheological polishing device. It can be directly installed at any position on the path between the centrifugal pump and the magnetorheological polishing head. At the same time, because the permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing of the present invention has a compact structure, it is convenient to place at any position in the magnetorheological fluid delivery system without affecting the structure of the entire device. Attached Figure Description

[0020] These and / or other aspects and advantages of the present invention will become clearer and more readily understood from the following detailed description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing according to Embodiment 1 of the present invention;

[0022] Figure 2 This is a front view of the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing according to Embodiment 1 of the present invention.

[0023] Figure 3 The magnetic field simulation calculation results of the permanent magnet deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention when the bottom surface size of the deceleration permanent magnet is 5mm×5mm;

[0024] Figure 4 The magnetic field simulation calculation results of the permanent magnet deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention when the bottom surface size of the deceleration permanent magnet is 7.5mm×7.5mm;

[0025] Figure 5The magnetic field simulation calculation results of the permanent magnet deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention when the bottom surface size of the deceleration permanent magnet is 10mm×10mm;

[0026] Figure 6 The magnetic field simulation calculation results of a fixed block with a wall thickness of 2mm in the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention;

[0027] Figure 7 The magnetic field simulation calculation results of a fixed block with a wall thickness of 3mm in the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention;

[0028] Figure 8 The magnetic field simulation calculation results of a fixed block with a wall thickness of 4mm in the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention;

[0029] Figure 9 The magnetic field simulation calculation results of a fixed block with a wall thickness of 5mm in the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention;

[0030] Figure 10 The magnetic field simulation calculation results of a fixed block with a wall thickness of 6mm in the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing in Embodiment 1 of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] A permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing, the structure of which is as follows: Figure 1 and 2 As shown, it includes a magnetically conductive outer shell 1, a magnetorheological fluid delivery pipe 2, a fixing block 3, and a decelerating permanent magnet 4;

[0034] The connection relationships of each component are as follows:

[0035] The magnetically conductive outer shell 1 is a hollow cavity, with holes at corresponding positions on its upper and lower end faces for connecting and fixing the block 3;

[0036] The fixing block 3 is a hollow tube, with its two ends connected to the top and bottom of the magnetically conductive shell 1, respectively, and communicating with the outside of the magnetically conductive shell 1 through a hole on the magnetically conductive shell 1;

[0037] The magnetorheological fluid delivery pipe 2 is disposed inside the fixed block 3 and passes through the holes at both ends of the magnetically conductive outer shell 1;

[0038] The deceleration permanent magnet 4 comprises two identical pieces, which are mirror images of each other on the outer periphery of the fixed block 3. The polarization direction of both deceleration permanent magnets 4 is perpendicular to the axis of the magnetorheological fluid delivery pipe 2.

[0039] The two deceleration permanent magnets 4 are fixed in the following manner: one end is fixed to the inner wall of the magnetic housing 1, and the other end is fixed to the outer wall of the fixing block 3.

[0040] The preferred design of the present invention is as follows:

[0041] The magnetorheological fluid delivery tube 2 is made of plastic and is used to deliver the magnetorheological fluid to the polishing tool head.

[0042] The fixing block 3 is made of a non-magnetic material, which is stainless steel and / or aluminum alloy;

[0043] The deceleration permanent magnet 4 is made of magnetic material, including ferrite and / or neodymium iron boron;

[0044] The magnetically conductive outer shell 1 is formed from electrical pure iron material;

[0045] The fixing block 3 is a cylindrical hollow tube with a wall thickness of 2-6mm;

[0046] The deceleration permanent magnet 4 is a cuboid with a single-end arc. One end of the connecting fixing block 3 is an arc end, and the other end is connected to the inner wall of the magnetically conductive outer shell 1. Its bottom surface dimensions are 5mm×5mm-10mm×10mm.

[0047] The inner diameter of the magnetorheological fluid delivery pipe 2 is 6mm-10mm.

[0048] The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing according to this embodiment of the invention is installed at any position on the path between the centrifugal pump and the magnetorheological polishing head. One end of the magnetorheological fluid delivery pipe 2 is connected to the output port of the centrifugal pump, and the other end is connected to the input port of the polishing head.

[0049] When the magnetorheological fluid is transported to the magnetorheological fluid delivery pipe 2 inside the permanent magnet type magnetorheological fluid deceleration device, the viscosity of the magnetorheological fluid gradually increases due to the influence of the magnetic field formed by the decelerating permanent magnet 4 inside the device. This increases the friction between the magnetorheological fluid and the inner surface of the magnetorheological fluid delivery pipe, thereby achieving deceleration and energy storage of the magnetorheological fluid.

[0050] The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing in this embodiment of the invention employs a combination of experimental testing and magnetic field simulation to verify and optimize its structural parameters. The magnetic field simulation uses Solidworks as the 3D modeling software and Ansys as the magnetic field simulation software. The magnetic field simulation is used to test and verify the influence of relevant components and their dimensions in the permanent magnet magnetorheological fluid deceleration device on the position and magnitude of the magnetic field acting on the magnetorheological fluid.

[0051] I. The Influence of Bottom Dimensions of the Deceleration Permanent Magnet on the Magnetic Field

[0052] First, Solidworks was used to model the excitation device: the outer wall dimensions of the magnetic shell 1 were set to 50mm×50mm×100mm, and the wall thickness was set to 3mm; the inner diameter of the magnetorheological fluid delivery pipe 2 was set to 6mm, and the wall thickness was set to 1mm; the inner diameter of the fixing block 3 was set to 8mm, the wall thickness was set to 3mm, and the height was set to 44mm; when Ansys was used for simulation, the material of the magnetic shell 1 was set to electrical pure iron, the material of the magnetorheological fluid delivery pipe 2 was set to ordinary plastic, the material of the fixing block 3 was set to stainless steel, the material of the deceleration permanent magnet 4 was set to ferrite, the coercivity was set to 3KOe, the residual magnetic induction intensity was set to 0.2T, the polarization direction was set to be perpendicular to the generatrix direction of the fixing block 3, and the polarization directions of the two fixing blocks 3 were consistent.

[0053] Simulations were conducted using the bottom dimensions of the deceleration permanent magnet 4 as variables, with values ​​of 5×5mm, 7.5×7.5mm, and -10mm×10mm respectively. The simulation results are as follows: Figures 3-5 As shown:

[0054] When the bottom surface size of the decelerating permanent magnet 4 is 5mm×5mm, the magnetic field strength at the center of the deceleration region is 18.67mT, and the magnetic field lines distribution in the deceleration magnetic field region is good. When the bottom surface size of the decelerating permanent magnet 4 is 7.5mm×7.5mm or 10mm×10mm, the magnetic field strength at the center of the deceleration region is 43mT and 65mT, respectively. Because the bottom surface size has a linear relationship with the magnetic field result, 5mm×5mm is its minimum limit size. If it is too small, it will significantly increase the processing difficulty and cost. Through the comparison of 10mm×10mm and 7.5mm×7.5mm, it can be seen that the bottom surface size of 5mm×5mm forms a good magnetic field line distribution in the deceleration magnetic field region without increasing the processing cost, which is especially suitable for small-sized polishing wheels.

[0055] It can be seen that when the bottom surface size of the deceleration permanent magnet 4 is 5mm×5mm, the magnetic field strength at the center of the deceleration region meets the expected value and the magnetic field lines in the deceleration magnetic field region are well distributed.

[0056] II. The Influence of Fixed Block Wall Thickness on the Magnetic Field

[0057] First, Solidworks was used to model the excitation device: the outer wall dimensions of the magnetic shell 1 were set to 50mm×50mm×100mm, and the wall thickness was set to 3mm; the inner diameter of the magnetorheological fluid delivery pipe 2 was set to 6mm, and the wall thickness was set to 1mm; the inner diameter of the fixing block 3 was set to 8mm, and the height was set to 44mm; when Ansys was used for simulation, the material of the magnetic shell 1 was set to electrical pure iron, the material of the magnetorheological fluid delivery pipe 2 was set to ordinary plastic, the material of the fixing block 3 was set to stainless steel, the material of the deceleration permanent magnet 4 was set to ferrite, the size was 5mm×5mm, the coercivity was set to 3KOe, the residual magnetic induction intensity was set to 0.2T, the polarization direction was set to be perpendicular to the generatrix direction of the fixing block 3, and the polarization directions of the two fixing blocks 3 were consistent.

[0058] Simulations were performed with the wall thickness of fixed block 3 as the variable, taking values ​​of 2, 3, 4, 5, and 6 mm respectively. The simulation results are as follows. Figure 6-10 As shown:

[0059] It can be seen that when the wall thickness of the fixed block 3 is 5mm, the magnetic field strength at the center of the deceleration region is 8.67mT. At the same time, the magnetic field lines in the deceleration magnetic field region are well distributed at this time.

[0060] The simulated magnetic field under the structural parameters of the permanent magnet magnetorheological fluid deceleration device meets the pre-design requirements in terms of magnetic field strength and shape, and can realize the deceleration and energy storage of magnetorheological fluid.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the inventive concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention (including dimensions such as the size of the conveying pipe and the thickness of the fixing block, unless otherwise specified, are within the protection scope of the present invention).

[0062] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing, characterized in that, It includes a magnetically conductive outer shell (1), a magnetorheological fluid delivery pipe (2), a fixing block (3), and a decelerating permanent magnet (4); The magnetic outer shell (1) is a hollow cavity, with holes at corresponding positions on its upper and lower end faces for connecting and fixing the fixing block (3). The fixing block (3) is a hollow tube, with its two ends connected to the top and bottom of the magnetic shell (1) respectively, and communicating with the outside of the magnetic shell (1) through the hole on the magnetic shell (1); The magnetorheological fluid delivery pipe (2) is disposed inside the fixed block (3) and passes through the holes at both ends of the magnetically conductive outer shell (1); The decelerating permanent magnet (4) comprises two identical pieces and is mirror-arranged on the outer periphery of the fixed block (3). The polarization direction of the two decelerating permanent magnets (4) is perpendicular to the axis of the magnetorheological fluid delivery pipe (2). The fixing block (3) is a cylindrical hollow tube with a wall thickness of 2-6 mm; The deceleration permanent magnet (4) is a cuboid with a single-end arc. One end of the connecting fixing block (3) is an arc end, and the other end is connected to the inner wall of the magnetic shell (1). Its bottom surface size is 5mm×5mm. The diameter of the magnetorheological fluid delivery pipe (2) is 6mm-10mm; The inner diameter of the fixing block (3) is 8mm-16mm.

2. The permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing as described in claim 1, characterized in that, The two deceleration permanent magnets (4) are fixed in the following manner: one end is fixed to the inner wall of the magnetic shell (1), and the other end is fixed to the outer wall of the fixing block (3).

3. The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing as described in claim 1, characterized in that, The magnetorheological fluid delivery tube (2) is made of plastic and is used to deliver the magnetorheological fluid to the polishing tool head.

4. The permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing as described in claim 1, characterized in that, The fixing block (3) is made of a non-magnetic material, which is stainless steel and / or aluminum alloy.

5. The permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing as described in claim 1, characterized in that, The decelerating permanent magnet (4) is made of magnetic material, including ferrite and / or neodymium iron boron.

6. The permanent magnet type magnetorheological fluid deceleration device based on magnetorheological polishing as described in claim 1, characterized in that, The magnetic outer shell (1) is formed from electrical pure iron material.

7. An application of the permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing as described in any one of claims 1-6, characterized in that, The permanent magnet magnetorheological fluid deceleration device based on magnetorheological polishing is installed at any position on the path between the centrifugal pump and the magnetorheological polishing head. One end of the magnetorheological fluid delivery pipe (2) is connected to the output port of the centrifugal pump, and the other end is connected to the input port of the polishing head.

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