A polishing method and polishing device based on magnetic composite fluid

Abstract

The present invention relates to a polishing method and a polishing device based on a magnetic composite fluid. The polishing method includes setting a tubular body to be polished, adding abrasives into the inside of the tubular body, setting a magnetic field, so that the magnetic fluid forms a magnetic chain brush and rolls relative to the inner wall of the tubular body; the polishing device includes a tubular body, a first driving element and a magnetic body. The tubular body rotates based on the axis of the tubular body. The tubular body is provided with a magnetic fluid and abrasive particles. The magnetic fluid forms a magnetic chain brush under the action of the magnetic field. The abrasive particles are attached to the top and bottom of the magnetic chain brush. During the rolling of the magnetic chain brush inside the tubular body, the abrasive particles and the inner wall of the tubular body generate relative motion to achieve polishing of the inner wall of the tubular body. The polishing method and the polishing device in the present invention are not limited by the aperture size of the tubular body and the internal structure of the tubular body, have good polishing effect, are easy to clean, and are relatively convenient to process.

Description

Technical Field

[0001] The invention relates to the technical field of polishing and automated processing, and in particular to a polishing method and a polishing device based on a magnetic composite fluid. Background Art

[0002] With the development of industrial production and technology, the aerospace, medical equipment and military industries have continuously increased their requirements for the precision of workpieces, especially high-precision pipe fittings, which have very high requirements for the roughness of the inner and outer surfaces of the pipe fittings.

[0003] In traditional processing methods, polishing is generally used to reduce the roughness of the workpiece, making the workpiece surface smoother and meeting the use requirements of the workpiece. Due to the limitations of the use environment, many pipe fittings have small apertures, which are difficult to be inserted by ordinary tools, making polishing difficult and unable to guarantee the roughness of the inner wall of the workpiece. Summary of the invention

[0004] The purpose of the present invention is to provide a polishing method and a polishing device based on a magnetic composite fluid to overcome the defects of great difficulty and low smoothness in polishing of pipe fittings.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A polishing method based on magnetic composite fluid comprises the following steps:

[0007] providing a tubular body to be polished;

[0008] Adding abrasive into the tubular body, wherein the abrasive includes magnetic fluid and abrasive particles;

[0009] A magnetic field is set to make the magnetic fluid form a magnetic chain brush and roll relative to the inner wall of the tubular body, and the abrasive particles roll along with the magnetic chain brush to polish the tubular body.

[0010] In a preferred embodiment, the method for making the magnetic chain brush roll relative to the inner wall of the tubular body is: the tubular body rotates based on the axis of the tubular body.

[0011] In a preferred embodiment, the method for generating a magnetic field is: a magnetic body is provided, the magnetic body generates a magnetic field, and the tubular body is located in the magnetic field.

[0012] In a preferred embodiment, the method for making the magnetic chain brush roll relative to the inner wall of the tubular body is: setting a magnetic field with changing magnetic flux lines, and placing the tubular body in the magnetic field.

[0013] In a preferred embodiment, the method for generating a magnetic field with changing magnetic flux lines is: a magnetic body is provided, and the magnetic body rotates in a direction parallel to the axis of the tubular body.

[0014] In a preferred embodiment, the magnetic chain brush reciprocates along the axial direction of the tubular body.

[0015] In a preferred embodiment, the method for making the magnetic chain brush reciprocate along the axial direction of the tubular body is: providing a driving unit, the driving unit is connected to the magnetic body and / or the tubular body and drives the magnetic body and / or the tubular body to move along the axis of the tubular body.

[0016] The present invention also provides a polishing device based on a magnetic composite fluid, comprising a tubular body, a first driving element and a magnetic body, wherein the first driving element is used to drive the magnetic body or the tubular body to be polished to rotate, the magnetic body is placed on the side of the tubular body, and abrasives are provided inside the tubular body, wherein the abrasives include magnetic fluid and abrasive particles.

[0017] In a preferred embodiment, it further includes a second driving element, which is connected to the magnetic body and drives the magnetic body to rotate in a direction parallel to the axis of the tubular body, and the tubular body and the magnetic body have the same rotation direction.

[0018] In a preferred embodiment, the second driving element drives the magnetic body to move along a direction parallel to the axial direction of the tubular body.

[0019] In a preferred embodiment, it also includes a base, the first driving element and the second driving element are installed on the base, the first driving element is installed with a first clamp, the first clamp is used to clamp the tubular body, and the second driving element is installed with a second clamp, the second clamp is used to clamp the magnetic body.

[0020] In a preferred embodiment, the abrasive further comprises magnetically susceptible particles.

[0021] In a preferred embodiment, the abrasive further comprises α-cellulose.

[0022] The present invention has at least the following beneficial effects:

[0023] A magnetic fluid and abrasive particles are arranged in the tubular body. The magnetic fluid forms a magnetic chain brush under the action of a magnetic field. The abrasive particles are attached to the top and bottom of the magnetic chain brush. During the rolling process of the magnetic chain brush inside the tubular body, the abrasive particles and the inner wall of the tubular body produce relative motion, thereby polishing the inner wall of the tubular body. The polishing method and the polishing device of the present invention are not limited by the aperture size of the tubular body and the internal structure of the tubular body, have good polishing effect, are easy to clean, and are relatively convenient to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a flow chart of an embodiment of a polishing method based on magnetic composite fluid;

[0026] Figure 2 It is a schematic structural diagram of an embodiment of a polishing device based on magnetic composite fluid. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present invention can be combined interchangeably without conflicting with each other.

[0028] First embodiment

[0029] In view of the difficulty in polishing small-diameter pipes, this embodiment provides a polishing method based on a magnetic composite fluid, comprising the following steps:

[0030] Reference Figure 1 First, a tubular body to be polished is set, and abrasives are put into the tubular body from the end surface thereof, wherein the abrasives include magnetic fluid and abrasive particles; then a magnetic field is set, the tubular body is located in the magnetic field, and the paramagnetic powder in the magnetic fluid is magnetized along the direction of the magnetic lines of force in the magnetic field, and arranged along the direction of the magnetic lines of force, forming a magnetic chain brush with a solid-like shape and a certain rigidity attached to the inner surface of the tubular body; the abrasive particles are clamped at the top and bottom of the magnetic chain brush under the action of the magnetic field, and are kept relatively fixed with the magnetic chain brush; as the magnetic chain brush rolls inside the tubular body, the abrasive particles and the inner wall of the tubular body move relative to each other, and continuously rub the inner wall of the tubular body, thereby completing the polishing process of the inner wall of the tubular body. The abrasive particles may also include magnetic sensitive particles, which can enhance the strength of the magnetic chain brush and optimize the polishing effect.

[0031] The polishing method in this embodiment is not limited by the internal shape of the tubular body and the size of the aperture. The magnetic chain brush can change with the change of the internal shape of the pipe. It has good flexibility and can reach any part of the workpiece, overcoming the problem of limiting the internal roughness of the pipe due to the small aperture of the pipe. The abrasive is liquid, and after polishing, the residual abrasive can be cleaned by blowing or cleaning, so the processing is more convenient.

[0032] The method of generating a magnetic field is to set a magnetic body, which generates a magnetic field to magnetize the magnetic fluid along the direction of the magnetic force lines. The magnetic body can be a permanent magnet or an electromagnet. The magnetic body in this embodiment is a permanent magnet.

[0033] The method of rolling the magnetic chain brush inside the tubular body is to rotate the tubular body based on the axis of the tubular body. During the rotation of the tubular body, the magnetic chain brush rolls violently inside the tubular body under the action of centrifugal force, magnetic force and friction force, thereby achieving efficient polishing of the inner wall of the tubular body.

[0034] Second embodiment

[0035] The present embodiment is different from the first embodiment in that the magnetic field with changing magnetic force lines is provided to realize the rolling of the magnetic brush inside the tubular body. Since the magnetic brushes are arranged along the direction of the magnetic force lines, when the magnetic force lines of the magnetic field change, the arrangement direction of the magnetic brushes changes at the same time, and relative movement occurs between the abrasive particles and the inner wall of the tubular body, thereby realizing the polishing of the inner wall of the tubular body by the abrasive particles.

[0036] In order to improve the rolling strength and polishing effect of the magnetic brush inside the tubular body, the method of realizing the rolling of the magnetic brush in the first embodiment and the second embodiment can be combined, that is, the rotating tubular body is placed in a magnetic field with changing magnetic lines of force. The abrasive inside the tubular body is constantly rolling and recombining to form a new magnetic brush, changing the relatively fixed form of the abrasive itself, so that the abrasive particles close to the wall of the tubular body are constantly updated, so that the abrasive particles maintain self-sharpening, and as the tubular body rotates, the friction between the abrasive particles and the inner wall of the tubular body increases, thereby enhancing the polishing strength of the abrasive particles on the inner wall of the tubular body, improving the utilization rate of the abrasive particles and the polishing effect on the inner wall of the tubular body.

[0037] The method for generating a magnetic field with changing magnetic lines of force is to set a magnetic body and rotate the magnetic body in a direction parallel to the axis of the tubular body. During the rotation of the magnetic body, the direction of the magnetic lines of force generated by the magnetic body changes accordingly. The magnetic body can be set as a permanent magnet, and the method for setting a magnetic field with changing magnetic lines of force is not limited thereto. For example, the relative position between the magnetic body and the tubular body can also be changed.

[0038] Third embodiment

[0039] On the basis of the first and second embodiments, the magnetic chain brush in this embodiment can move repeatedly along the axis of the tubular body in the tubular body. By moving the magnetic chain brush inside the tubular body, the magnetic chain brush polishes every part of the inner wall of the tubular body it passes through, optimizing the polishing effect of the abrasive on the tubular body; and by reciprocating the magnetic chain brush inside the tubular body, the magnetic chain brush repeatedly polishes the inner wall of the tubular body, improving the polishing accuracy and smoothness of the inner wall of the tubular body.

[0040] The method for causing the magnetic chain brush to reciprocate along the axial direction of the tubular body is as follows: a driving unit is provided, the driving unit is connected to the magnetic body and / or the tubular body, and the magnetic body and the tubular body are driven to move relative to each other along the axial direction of the tubular body, so that the magnetic chain brush located inside the tubular body reciprocates relative to the axis of the tubular body under the action of magnetic force.

[0041] Reference Figure 2 The present invention also provides a polishing device based on magnetic composite fluid, which includes a first driving element 20 and a magnetic body 10. The first driving element 20 is used to drive the tubular body 30 to be polished to rotate, and the magnetic body 10 is used to generate a magnetic field. The tubular body 30 is provided with a polishing abrasive inside. Specifically, the tubular body 30 is fixed on the first driving element 20, so that the tubular body 30 rotates under the driving action of the first driving element 20; the tubular body 30 is placed in the magnetic field generated by the magnetic body 10, and the abrasive includes a magnetic fluid and abrasive particles. The paramagnetic micropowder in the magnetic fluid is magnetized along the direction of the magnetic force line to form a magnetic chain brush. The abrasive particles are clamped at the top and bottom of the magnetic chain brush under the action of the magnetic field. As the tubular body 30 rotates, the abrasive particles and the inner wall of the tubular body 30 generate relative motion to polish the inner wall of the tubular body 30; the abrasive particles also include magnetic sensitive particles, which can enhance the strength of the magnetic chain brush and optimize the polishing effect.

[0042] The polishing machine further includes a second driving element 40, which is connected to the magnetic body 10 and drives the magnetic body 10 to rotate in a direction parallel to the axis of the tubular body 30. When the magnetic body 10 rotates, the magnetic lines of force change, and the magnetic chain brushes inside the tubular body 30 are rearranged as the direction of the magnetic lines of force changes. The abrasive continuously rolls inside the tubular body 30 as the tubular body 30 rotates, and the abrasive particles are continuously updated, so that the abrasive particles close to the inner wall of the tubular body 30 are continuously metabolized, thereby maintaining the self-sharpening property of the abrasive particles and improving the polishing effect.

[0043] The tubular body 30 and the magnetic body 10 rotate in the same direction, so that the movement direction of the magnetic brush inside the tubular body 30 is opposite to the rotation direction of the tubular body 30, thereby enhancing the friction strength between the abrasive particles and the inner wall of the tubular body 30 and improving the polishing efficiency of the abrasive particles on the inner wall of the tubular body 30.

[0044] The second driving element 40 can also drive the magnetic body 10 to reciprocate in a direction parallel to the axis of the tubular body 30, so that the magnetic chain brush moves inside the tubular body 30 following the movement of the magnetic body 10, and as the abrasive rolls inside the tubular body 30, the abrasive grains polish different parts of the inner wall of the tubular body 30 to optimize the polishing effect. The abrasive grains follow the reciprocating movement of the magnetic body 10, repeatedly polishing the inner wall of the tubular body 30, further improving the polishing effect of the abrasive grains on the tubular body 30.

[0045] The relative movement mode between the above-mentioned magnetic body 10 and the tubular body 30 is not limited to this. For example, the first driving element 20 can drive the tubular body 30 to move along the axis of the tubular body 30, and the magnetic body 10 remains fixed, thereby realizing the relative movement between the tubular body 30 and the magnetic body 10; or the first driving element 20 drives the tubular body 30 to move along the axis of the tubular body 30, and at the same time the second driving element 40 drives the magnetic body 10 to move in a direction parallel to the axis of the tubular body 30. The movement directions of the tubular body 30 and the magnetic body 10 are opposite, and the relative movement of the two is also realized, so that the magnetic chain brush moves back and forth inside the tubular body 30.

[0046] The apparatus further comprises a base 50, on which the first driving element 20 and the second driving element 40 are mounted. In this embodiment, the first driving element 20 and the second driving element 40 are distributed on both sides of the base 50, and the magnetic body 10 is located on the side of the tubular body 30. A first clamp 60 is also mounted on the first driving element 20, and the first clamp 60 is used to clamp the tubular body 30; a second clamp 70 is also mounted on the second driving element 40, and the second clamp 70 is used to clamp the magnetic body 10, so as to achieve relative fixation between the magnetic body 10 and the second driving element 40, and between the tubular body 30 and the first driving element 20. The outer surface of the magnetic body 10 is 1mm-10mm away from the outer surface of the tubular body 30, so as to ensure that the tubular body 30 has sufficient magnetic field strength, so that the abrasive particles polish the tubular body 30 under the action of sufficient magnetic field force.

[0047] The first driving element 20 can be a DC motor, and the second driving element 40 can be a stepping motor. The maximum speed of the first driving element 20 is 6000r / min, and the maximum speed of the second driving element 40 is 2500r / min. The preferred speed of the tubular body 30 is 4000r / min, and the preferred speed of the magnetic body 10 is 600r / min. The second clamp 70 can be a three-jaw chuck, and a screw rod is installed on the second driving element 40. The magnetic body 10 is fixed on the screw rod, so that the magnetic body 10 moves in a direction parallel to the tubular body 30 under the drive of the second driving element 40; or, the second driving element 40 is slidably installed on the base 50, and the second driving element 40 can move on the base 50 along the axial direction of the tubular body 30, so that the second driving element 40 drives the magnetic body 10 to rotate and drives the magnetic body 10 to move. Two first clamps 60 are arranged on the base 50 to hold the tubular body 30. The two first clamps 60 are arranged at both ends of the tubular body 30 to achieve relative fixation between the tubular body 30 and the base 50, so that the tubular body 30 maintains balance and stability during the polishing process, and optimizes the polishing effect. The tubular body 30 can be a small-diameter and non-magnetic thin tube, slender tube, capillary tube, straight tube or curved tube.

[0048] The magnetic body 10 can be a permanent magnet or an electromagnet. The magnetic body 10 in this embodiment is a permanent magnet, such as a square magnet or an annular cylindrical magnet. Because the magnetic lines of force of the annular cylindrical magnet undergo periodic changes during rotation, the magnetic field strength is uniform, and it has a better polishing effect. It is preferably an annular cylindrical magnet, the material of which is neodymium iron boron and is magnetized along the diameter direction.

[0049] The magnetic fluid is the base liquid of the magnetic composite fluid grinding, and is preferably a water-based suspension of nano-scale ferroferric oxide particles with good flow properties. The abrasive particles can be selected as micron-sized aluminum oxide particles or diamond powder. The abrasive particles have a high hardness and can grind the inner wall of the tubular body 30. The abrasive particles are round and will not scratch the inner wall of the tubular body 30 during polishing. The diameter is preferably 3 to 7 μm. The magnetic sensitive particles can be selected from micron-sized carbonyl iron powder. The carbonyl iron powder dispersed in the magnetic fluid can enhance the strength of the magnetic chain brush, improve the shear yield stress and material removal rate of the magnetic chain brush, and optimize the polishing effect; and the carbonyl iron powder has a high magnetic permeability and a low magnetic coercive force, which can meet the rheological requirements of the magnetic fluid. The abrasive also includes α-cellulose, which can be interwoven in the magnetic chain brush to improve the strength and toughness of the magnetic chain brush.

[0050] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A polishing method based on magnetic composite fluid, characterized in that: The following steps are included: providing a tubular body to be polished; Adding abrasive into the tubular body, wherein the abrasive includes magnetic fluid and abrasive particles; A magnetic body is arranged to rotate in a direction parallel to the axis of the tubular body to form a magnetic field with changing magnetic flux lines, and the rotating tubular body is placed in the magnetic field so that the magnetic fluid forms a magnetic chain brush, which continuously rolls relative to the inner wall of the tubular body and recombine to form a new magnetic chain brush, and the abrasive particles roll along with the magnetic chain brush to polish the tubular body.

2. The polishing method based on magnetic composite fluid according to claim 1, characterized in that: The method of making the magnetic chain brush roll relative to the inner wall of the tubular body is: the tubular body rotates based on the axis of the tubular body.

3. The polishing method based on magnetic composite fluid according to claim 1, characterized in that: The magnetic chain brush reciprocates along the axial direction of the tubular body.

4. The polishing method based on magnetic composite fluid according to claim 3, characterized in that: The method for making the magnetic chain brush reciprocate along the axial direction of the tubular body is: providing a driving unit, the driving unit is connected to the magnetic body and / or the tubular body and drives the magnetic body and / or the tubular body to move along the axis of the tubular body.

5. A polishing device based on magnetic composite fluid, characterized in that: The invention comprises a tubular body, a first driving element and a magnetic body, wherein the first driving element is used to drive the magnetic body or the tubular body to be polished to rotate, the magnetic body is placed on the side of the tubular body, an abrasive is arranged inside the tubular body, and the abrasive comprises a magnetic fluid, abrasive particles and magnetically sensitive particles, and further comprises a second driving element, wherein the second driving element is connected to the magnetic body and drives the magnetic body to rotate in a direction parallel to the axis of the tubular body to form a magnetic field with changing magnetic flux lines, and the rotating tubular body is placed in the magnetic field so that the magnetic fluid forms a magnetic chain brush, the magnetic chain brush continuously rolls relative to the inner wall of the tubular body, and recombine to form a new magnetic chain brush, and the abrasive particles roll along with the magnetic chain brush to polish the tubular body.

6. The polishing device based on magnetic composite fluid according to claim 5, characterized in that: The tubular body and the magnetic body have the same rotation direction.

7. The polishing device based on magnetic composite fluid according to claim 5, characterized in that: It also includes a base, the first driving element and the second driving element are installed on the base, the first driving element is installed with a first clamp, the first clamp is used to clamp the tubular body, the second driving element is installed with a second clamp, the second clamp is used to clamp the magnetic body.

8. The polishing device based on magnetic composite fluid according to claim 5, characterized in that: The abrasive material also includes Cellulose.

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