A magnetorheological polishing excitation device based on high-steep light element and application thereof

Abstract

Provided are a magnetizing device based on high-steepness strong light element magnetorheological polishing and application thereof. The magnetizing device comprises a magnetizing body (1), a magnetic conducting horizontal sheet (2) and a fixing block (3). The magnetizing body (1) is two magnets with the same size. The magnet comprises a vertical section and an inclined section which is integrally formed with the vertical section at a lower end of the vertical section and forms a certain angle with the vertical section. The fixing block (3) is arranged between the two magnets and is used for symmetrically arranging the two magnets on both sides of the fixing block in a manner that the inclined sections of the two magnets face the fixing block, and the two magnets are separated and fixed. The top of the two magnets is connected through the magnetic conducting horizontal sheet (2). The bottom end of the fixing block is located in the two magnets and is used for jointly surrounding a cavity with an open bottom with the lower end of the two magnets. The polarization directions of the two magnets are parallel to the distance direction between the two magnets and are opposite to each other. The magnetizing device is installed in a spherical magnetorheological polishing wheel (4), and the polarization directions of the two magnets are perpendicular to the rotating direction of the spherical magnetorheological polishing wheel.

Description

Technical Field

[0001] The present invention generally relates to the technical field of optical element polishing, and in particular to an excitation device based on magnetorheological polishing of high-steepness and high-intensity optical elements and its application. Background Art

[0002] With the continuous development of modern optical systems, the shapes of optical components within these systems are becoming increasingly complex. To further improve device performance, a large number of high-steepness optical components, such as optical fairings, have been produced. Surface polishing of these components has become a major challenge in the field of optical manufacturing.

[0003] As a representative of modern optical processing technology, magnetorheological fluid (MRF) is widely used in high-precision machining of various optical surfaces. Different polishing heads can be used to adapt to the processing of various optical components of different shapes. However, its processing efficiency and results are somewhat insufficient for highly steep optical surfaces, which to some extent limits its application in high-steepness, high-intensity optical components.

[0004] In view of the problems existing in the original electromagnetic magnetorheological polishing device and the current application needs of high-steepness and strong optical components, it is urgent to develop a new generation of magnetorheological polishing equipment to improve the machinability of high-steepness optical components and ensure the development progress of modern optical systems. Summary of the Invention

[0005] The purpose of the present invention is to provide an excitation device based on magnetorheological polishing of high-steepness strong light elements and its application. The excitation device is suitable for a spherical magnetorheological polishing wheel for polishing the surface of high-steepness optical elements. It solves the problems of difficult polishing, long polishing cycle and low efficiency of the current spherical magnetorheological polishing wheel when polishing the surface of high-steepness optical elements, and realizes high-precision and high-efficiency polishing of the surface of optical elements.

[0006] The technical solution of the present invention is to first provide an excitation device based on magnetorheological polishing of high-steepness strong light elements, including an excitation body, a magnetic transverse plate and a fixed block; the excitation body is two magnets of the same size, and the magnet includes a vertical section and an inclined section arranged at the lower end of the vertical section and integrally formed at a certain angle to the vertical section; the fixed block is arranged between the two magnets of the excitation body, and is used to make the two magnets symmetrically arranged on both sides of the fixed block with their respective inclined sections facing the fixed block and be separated and fixed; the tops of the two magnets of the excitation body are connected by a magnetic transverse plate; the top of the fixed block is connected to the magnetic transverse plate, and the bottom end is located in the two magnets of the excitation body, and together with the lower ends of the two magnets, it forms a cavity with an open bottom; the polarization directions of the two magnets of the excitation body are parallel to the distance direction between the two magnets and are opposite to each other.

[0007] Furthermore, the excitation magnet is cut and formed from neodymium iron boron material.

[0008] Furthermore, the magnetic conductive transverse plate is made of electrical pure iron material.

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

[0010] Furthermore, in the magnet of the above-mentioned excitation magnet: the sum of the heights of the vertical section and the inclined section is called the magnetic arm height, and its value is in the range of 35mm-40mm; the angle between the inclined section and the vertical section is 110°-120°; the height ratio of the inclined section to the vertical section is: (1:28)-(1:10).

[0011] Furthermore, the thickness of the magnetic conductive transverse sheet is 2.5-5 mm.

[0012] Furthermore, the dimensions of the above-mentioned fixing block are expressed as 38mm×20mm× according to length×width×height; the width refers to the dimension in the vertical direction of the magnet of the excitation body; the height refers to the dimension of the distance between the two magnets connecting the excitation body.

[0013] Furthermore, threaded holes are provided at the connection points of the excitation body, the magnetic transverse plate and the fixing block for connecting the three to each other.

[0014] The present invention also provides the application of the above-mentioned excitation device based on magnetorheological polishing of high-steepness and high-intensity light elements. The excitation device is installed in a spherical magnetorheological polishing wheel, and the polarization directions of the two magnets are perpendicular to the rotation direction of the spherical magnetorheological polishing wheel; the diameter of the spherical magnetorheological polishing wheel is 60-70 mm.

[0015] Furthermore, the excitation device is fixed inside the spherical magnetorheological polishing wheel through an external gripping member. When the spherical magnetorheological polishing wheel rotates, the excitation device remains fixed, and the closest distance between the outer side of the excitation device and the inner wall of the spherical magnetorheological polishing wheel is 1 cm.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The excitation device for high-steepness, high-intensity light element magnetorheological polishing proposed in this invention has a small number of structural components, a simple structure, and is easy to manufacture. Installed inside a spherical polishing wheel, it can achieve precise and efficient polishing of the magnetorheological polishing wheel. The structural dimensions and positional relationships of the components affect the magnetic field strength and shape of the gradient magnetic field produced by the excitation element on the polishing wheel surface, particularly the angle between the vertical and inclined sections of the excitation element. If the angle is too small, the gradient magnetic field decreases. If the angle is too large, the gradient magnetic field increases, but the size of the entire excitation element increases, affecting the installation of the excitation device within the wheel. Material selection: The material and brand of the excitation element primarily affect the magnetic field length of the gradient magnetic field. The present invention aims to obtain a magnet with a high inherent magnetic field strength to achieve a larger gradient magnetic field.

[0018] 2. The excitation device based on magnetorheological polishing of high-steepness strong light components proposed in the present invention can form a polishing magnetic field and a recovery magnetic field on the surface of a small-sized spherical magnetorheological polishing wheel, which can achieve high-precision polishing of the surface of high-steepness components and solve the current problems of difficulty in manufacturing high-steepness components.

[0019] 3. The excitation device for magnetorheological polishing of high-steepness, high-intensity optical components proposed in this invention can generate a recovery magnetic field (generated by magnetic flux leakage from the excitation device) and a polishing magnetic field on the surface of the magnetorheological polishing wheel, ensuring the smooth progress of the entire magnetorheological polishing process. Compared with existing devices, the excitation device for magnetorheological polishing of high-steepness, high-intensity optical components disclosed in this invention has a significantly smaller excitation magnet volume than existing small-caliber electromagnet excitation devices, significantly reducing the required polishing wheel volume and adapting to the surface processing environment of high-steepness optical components. Furthermore, the use of permanent magnets enables the formation of a stable magnetic field on the polishing wheel surface, ensuring the stability of the magnetorheological polishing process for high-steepness, high-intensity optical components. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 Schematic diagram of the structure of the excitation device based on magnetorheological polishing of high-steepness and strong light elements according to Example 1 of the present invention;

[0022] Figure 2 Schematic diagrams of the structure of the excitation device for magnetorheological polishing based on high-steepness and high-intensity light elements according to Example 1 of the present invention when applied to a spherical magnetorheological polishing wheel from different perspectives, wherein (a) is an external stereoscopic view of the excitation device within the spherical magnetorheological polishing wheel; (b) is a schematic diagram of the spherical magnetorheological polishing wheel and the excitation device therein from a frontal view; and (c) is a schematic diagram of the spherical magnetorheological polishing wheel and the excitation device therein from a left side view.

[0023] Figure 3This is the magnetic field intensity result when the angle between the inclined section and the vertical section is 110 degrees in the excitation device based on magnetorheological polishing of high-steepness strong light elements in an embodiment of the present invention;

[0024] Figure 4 This is the magnetic field intensity result when the angle between the inclined section and the vertical section is 115 degrees in the excitation device based on magnetorheological polishing of high-steepness strong light elements in an embodiment of the present invention;

[0025] Figure 5 This is the magnetic field intensity result when the angle between the inclined section and the vertical section is 120 degrees in the excitation device based on magnetorheological polishing of high-steepness strong light elements in an embodiment of the present invention;

[0026] Figure 6 This is the magnetic field strength result of the excitation arm height of 35mm in the excitation device based on magnetorheological polishing of high-steepness strong light elements in the embodiment of the present invention;

[0027] Figure 7 This is the magnetic field strength result of the excitation arm height of 37.5mm in the excitation device based on magnetorheological polishing of high-steepness strong light elements in the embodiment of the present invention;

[0028] Figure 8 This is the magnetic field strength result of the excitation magnet arm height of 40mm in the excitation device based on magnetorheological polishing of high-steepness strong light elements in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] An excitation device based on magnetorheological polishing of high-steepness strong light element, its structure is as follows Figure 1 As shown, it includes the following components: an excitation body 1, a magnetic transverse plate 2 and a fixed block 3; the specific components and their connection relationships are as follows:

[0032] The excitation magnet 1 is two magnets of the same size, each of which includes a vertical section and an inclined section provided at the lower end of the vertical section and integrally formed at a certain angle to the vertical section;

[0033] The fixing block 3 is arranged between the two magnets of the excitation body 1, and is used to symmetrically arrange the two magnets on both sides of the fixing block with their respective inclined sections facing the fixing block and to be separated and fixed;

[0034] The tops of the two magnets of the excitation body 1 are connected by a magnetic transverse plate 2;

[0035] The top of the fixing block 3 is connected to the magnetic transverse plate 2, and the bottom end is located inside the two magnets of the excitation body 1, and together with the lower ends of the two magnets, a cavity with an open bottom is formed;

[0036] The polarization directions of the two magnets of the excitation body 1 are parallel to the distance direction between the two magnets and are opposite to each other.

[0037] The preferred designs of each component are as follows:

[0038] The excitation magnet 1 is cut and formed from neodymium iron boron material.

[0039] The magnetic transverse plate 2 is made of electrical pure iron material.

[0040] The fixing block 3 is made of a non-magnetic material, such as aluminum alloy and / or stainless steel.

[0041] In the magnet of the excitation magnet 1, the sum of the heights of the vertical section and the inclined section is called the magnetic arm height, which is within the range of 35 mm to 40 mm; the angle between the inclined section and the vertical section is 110° to 120°; and the height ratio of the inclined section to the vertical section is 1:28 to 1:10.

[0042] The thickness of the magnetic conductive transverse sheet 2 is 2.5-5 mm.

[0043] The dimensions of the fixing block 3 are 38mm×20mm×9-13mm in terms of length×width×height; the width refers to the dimension in the vertical direction of the magnet of the excitation magnet 1; the height refers to the distance between the two magnets connecting the excitation magnet 1;

[0044] Threaded holes are provided at the connection points of the excitation body 1 , the magnetic transverse plate 2 and the fixing block 3 for connecting the three to each other.

[0045] The excitation device of the embodiment of the present invention is installed in the spherical magnetorheological polishing wheel 4, and the polarization direction of the two magnets is perpendicular to the rotation direction of the spherical magnetorheological polishing wheel; the diameter of the spherical magnetorheological polishing wheel is 50-60 mm.

[0046] The specific installation method is: the excitation device is fixed inside the spherical magnetorheological polishing wheel 4 through an external grabbing piece, and the excitation device remains fixed when the spherical magnetorheological polishing wheel rotates. The closest distance between the outer side of the excitation device and the inner wall of the spherical magnetorheological polishing wheel is 1 cm.

[0047] The structural schematic diagram of different perspectives when the excitation device based on high-steepness strong light element magnetorheological polishing is applied to the spherical magnetorheological polishing wheel is shown as follows: Figure 2As shown, (a) is an external stereoscopic view of the excitation device within the spherical magnetorheological polishing wheel; (b) is a schematic diagram of the spherical magnetorheological polishing wheel and the excitation device within it, viewed from the front; and (c) is a schematic diagram of the spherical magnetorheological polishing wheel and the excitation device within it, viewed from the left. It can be seen that, in terms of spatial structure, the excitation device 1, the magnetic transverse plate 2, and the fixed block 3 together constitute the excitation device and are placed vertically in the y-direction within the spherical magnetorheological polishing wheel 4. The excitation device is symmetrical along the central plane of the spherical magnetorheological polishing wheel 4. While the excitation device generates a gradient magnetic field for polishing at the lower end in the y-direction (i.e., the space formed between the lower end of the fixed block and the two magnets of the excitation device), it also generates a weak magnetic field on the surface of the polishing wheel by means of magnetic leakage, which can be used as a recovery magnetic field. As the magnetorheological fluid flows vertically downward along the top edge of the Y-axis, it adheres to the polishing wheel's surface due to the weak magnetic field. The wheel's rotation then carries it to the polishing gradient magnetic field at the lower end of the Y-axis. There, the fluid hardens and polishes the optical element below the polishing field. The distance between the magnetorheological fluid and the optical element surface is approximately 0.2 mm. After polishing, the fluid leaves the polishing field area for recovery under the rotating motion of the polishing wheel.

[0048] Therefore, the device according to the present invention can form a magnetorheological ribbon on the surface of a magnetorheological polishing wheel when magnetorheological fluid is delivered through a delivery tube. The magnetic field of the excitation device of the present invention is applied to the polishing wheel. The narrow ribbon width and compact polishing wheel size make it suitable for high-precision polishing of surfaces with high steepness. Furthermore, the excitation device has a simple structure, making it easy to manufacture and maintain. Its light weight also enhances the stability of the magnetorheological polishing device.

[0049] The present invention studies the influence of the structural parameter changes of the excitation device on the magnetic field through device manufacturing, 3D modeling restoration, and magnetic field simulation. The 3D modeling software is Solidworks, and the magnetic field simulation software is Ansys finite element software. Specifically, the following aspects are included:

[0050] 1. The influence of the change of the angle between the inclined section and the vertical section in the excitation device on the magnetic field

[0051] First, the following structural material and dimensional parameters of the excitation device and the spherical magnetorheological polishing wheel 4 are clarified:

[0052] The dimensions of the fixing block 3 are 38 mm (length x width x height) by 20 mm (9-13 mm). The height of the fixing block 3 is related to the angle between the inclined and vertical sections of the excitation device, ensuring contact with the surfaces of the two excitation magnets. The height of the magnetic arm of the excitation magnet 1 is 35 mm, the thickness of the magnetic transverse plate 2 is 2.5 mm, and the diameter of the spherical magnetorheological polishing wheel 4 is 70 mm.

[0053] Then, the angle between the inclined section and the vertical section in the excitation device is used as a variable, and the values ​​are 110 degrees, 115 degrees, and 120 degrees respectively. The results are as follows: Figure 3-Figure 5 As shown: It can be seen that

[0054] When the angle between the inclined section and the vertical section in the excitation device is 120 degrees, the polishing magnetic field intensity is 225 mT and the recovery magnetic field is also about 10 mT, which meets the design requirements.

[0055] 2. The influence of the change of the height of the excitation arm of the excitation device on the magnetic field

[0056] First, the following structural material and dimensional parameters of the excitation device and the spherical magnetorheological polishing wheel 4 are clarified:

[0057] The dimensions of the fixing block 3 are 38mm (length x width x height) by 20mm (width x height) by 9-13mm. The height of the fixing block 3 is related to the angle between the inclined and vertical sections of the excitation device, ensuring contact with the surfaces of the two excitation magnets. The angle between the inclined and vertical sections of the excitation magnet 1 is 120 degrees. The thickness of the magnetic transverse plate 2 is 2.5mm, and the diameter of the spherical magnetorheological polishing wheel 4 is 70mm.

[0058] Then, the height of the magnetic arm of the excitation device is taken as a variable, and the values ​​are 35mm, 37.5mm, and 40mm respectively. The results are as follows: Figure 6-Figure 8 As shown, it can be seen that when the height of the magnetic arm of the excitation body 1 is 35 mm, the polishing magnetic field intensity is 220 mT and the recovery magnetic field intensity is 10 mT, which meets the design requirements.

[0059] Combined with the above conclusions, the optimal structural dimensions of the excitation body 1 in the excitation device are that the angle between the inclined section and the vertical section is 120 degrees, and the height of the magnetic arm of the excitation body 1 is 35 mm.

[0060] While various embodiments of the present invention have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limiting of the disclosed embodiments. Numerous 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 the present invention shall be determined by the scope of the claims.

Claims

1. An excitation device based on magnetorheological polishing of high-steepness strong light elements, characterized in that: It includes an excitation body (1), a magnetic transverse plate (2) and a fixed block (3); The excitation magnets (1) are two magnets of the same size, each comprising a vertical section and an inclined section arranged at the lower end of the vertical section and integrally formed at a certain angle to the vertical section; The fixed block (3) is arranged between the two magnets of the excitation body (1) and is used to symmetrically arrange the two magnets on both sides of the fixed block with their respective inclined sections facing the fixed block and to be separated and fixed; The tops of the two magnets of the excitation body (1) are connected via a magnetic transverse plate (2); The top end of the fixed block (3) is connected to the magnetic transverse plate (2), and the bottom end is located inside the two magnets of the excitation body (1), and together with the lower ends of the two magnets, forms a cavity with an open bottom. The polarization directions of the two magnets of the excitation body (1) are parallel to the distance direction between the two magnets and are opposite to each other; The excitation magnet (1) is cut and formed from neodymium iron boron material; The magnetic transverse plate (2) is made of electrical pure iron material; The fixing block (3) is made of a non-magnetic material, and the non-magnetic material is an aluminum alloy and / or stainless steel; In the magnet of the excitation body (1): The sum of the heights of the vertical section and the inclined section is called the magnetic arm height, which is in the range of 35mm-40mm; The angle between the inclined section and the vertical section is 110°-120°; the height ratio between the inclined section and the vertical section is: (1:28)-(1:10); The excitation device is installed in the spherical magnetorheological polishing wheel (4), and the polarization directions of the two magnets are perpendicular to the rotation direction of the spherical magnetorheological polishing wheel; The diameter of the spherical magnetorheological polishing wheel is 60-70 mm.

2. The excitation device based on magnetorheological polishing of high-steepness strong light element according to claim 1 is characterized in that: The thickness of the magnetic transverse sheet (2) is 2.5-5 mm.

3. The excitation device based on magnetorheological polishing of high-steepness strong light element according to claim 1 is characterized in that: The dimensions of the fixing block (3) are expressed as 38 mm × 20 mm × (9-13 mm) in terms of length × width × height; The width refers to the size of the vertical section of the magnet of the excitation body (1); the height refers to the size of the distance between the two magnets connecting the excitation body (1).

4. The excitation device based on magnetorheological polishing of high-steepness strong light element according to claim 1 is characterized in that: Threaded holes are provided at the connection points of the excitation body (1), the magnetic transverse plate (2), and the fixed block (3), so as to connect the three to each other.

5. The excitation device based on magnetorheological polishing of high-steepness strong light element according to claim 1 is characterized in that: The excitation device is fixed in the spherical magnetorheological polishing wheel (4) through an external gripping member. When the spherical magnetorheological polishing wheel rotates, the excitation device remains fixed. The closest distance between the outer side of the excitation device and the inner wall of the spherical magnetorheological polishing wheel is 1 cm.

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