Solid-liquid two-phase flow magnetic shear thickening and polishing device and method based on controllable multi-physical field coupling

Abstract

The invention discloses a solid-liquid two-phase flow magnetic shear thickening polishing device and method based on controllable multi-physical field coupling, and belongs to the field of magnetic field auxiliary polishing. In order to solve the problems of low polishing efficiency and poor polishing quality uniformity caused by single physical field and poor controllability in the traditional magnetic field assisted polishing technology, the invention provides a coupling effect of a controllable magnetic field and a flow field to realize high-efficiency and high-quality precise polishing. The polishing device is composed of a screw pump, a permanent magnet, a magnetic pole support, a circulating pipeline, an inlet flange, a baffle, a clamp, a workpiece, a positioning block, a positioning plate, an outlet flange and a circulating pipe flange. Permanent magnets with different distributions and polarities are arranged in the magnetic pole support, the magnetic field intensity and the targeting degree of a polishing area are accurately controlled, and the screw pump conveys a polishing medium to the polishing area at a specific flow speed through rotating extrusion of a screw. The curing degree of the polishing medium and the control force of the grinding material are controlled by precisely regulating and controlling the coupling effect of the magnetic field and the flow field, and efficient and high-quality precise polishing of the workpiece is achieved.

Description

Technical Field

[0001] The invention relates to a magnetic field assisted polishing technology, and in particular to a solid-liquid two-phase flow magnetic shear thickening polishing device and method based on controllable multi-physical field coupling. Background Art

[0002] The surface of high-quality parts has advantages such as strong corrosion resistance, wear resistance and high fatigue strength. At present, polishing technology is one of the effective ways to improve parts. However, polishing technology faces many challenges in practical applications. For example, it usually relies on the action of a single physical field, and it is difficult to flexibly adjust the parameters in the polishing process, resulting in uncontrollable processing quality, especially when processing parts with complex geometric shapes. It is easy to have low polishing efficiency and uneven local processing. In addition, this random distribution is also prone to surface defects such as scratches and burrs. When faced with high-hardness materials or narrow curved cavities, these defects are further aggravated, making it difficult for the processed parts to maintain consistent polishing quality and high precision. In order to solve these problems, the present invention proposes a solid-liquid two-phase flow magnetic shear thickening polishing device and method based on controllable multi-physical field coupling, which uses the coupling effect of controllable magnetic field and flow field to control the polishing medium, thereby achieving efficient, high-quality and precise polishing. Summary of the invention

[0003] The present invention aims to solve the problems of low polishing efficiency and poor polishing quality uniformity caused by the single physical field and poor controllability of the traditional magnetic field assisted polishing technology, and proposes to use the coupling effect of the controllable magnetic field and flow field to achieve efficient and high-quality polishing. Through the rotation and extrusion of the screw, combined with the magnetic field in the polishing area, the coupling effect of the magnetic field and flow field is precisely controlled to control the curing degree of the polishing medium and the control force of the abrasive, thereby improving the polishing efficiency and quality.

[0004] The technical solution provided by the solid-liquid two-phase flow magnetic shear thickening and polishing device based on controllable multi-physical field coupling of the present invention is as follows: the device includes a base 1, a screw pump 2, a permanent magnet 3, a pole bracket 4, a circulation pipeline 5, an inlet flange 6, a baffle 7, a clamp 8, a workpiece 9, a positioning block 10, a positioning plate 11, an outlet flange 12, and a circulation pipe flange 13. The workpiece 9 in the device is clamped by the clamp 8, the positioning block 10 in the device is installed on the positioning plate 11 and fixed by a hexagon socket bolt, the clamp 8 in the device is installed in a groove formed by the positioning block 10, and the baffle 7 in the device is installed on the positioning plate, and the internal groove is aligned with the positioning block 11. The protrusions of the stroke of the positioning block 10 cooperate with each other, the outlet flange 12 in the device is installed on the positioning plate 11, the baffle 7, the positioning plate 11, and the outlet flange 12 in the device are installed on the inlet flange 6 by long bolts, the inlet flange 6 in the device is connected to the outlet of the screw pump 2 by bolts, the circulation pipe flange 13 in the device is installed on the outlet flange 12 by bolt connection, the circulation pipe 5 in the device is installed on the circulation pipe flange 13, and the pipe outlet is opposite to the feed port of the screw pump 2, the permanent magnet 3 in the device is installed on the pole bracket 4 in a specific arrangement, and the pole bracket 4 in the device is installed on the outside of the baffle 7.

[0005] The beneficial effects of the present invention are as follows: 1. The solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling described in the present invention, the flow field is controlled by screw rotation extrusion, and the magnetic field is controlled by the magnetic poles of the polishing area, which is more controllable than the polishing method of a single physical field. 2. The solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling described in the present invention, a multi-pole controllable magnetic field is formed in the polishing area, so that the polishing medium is evenly distributed under the action of the magnetic field, effectively avoiding the problem of uneven medium distribution in traditional polishing methods. 3. The solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling described in the present invention, the shear motion enhances the polishing force of the polishing medium in the high shear area, thereby enhancing the polishing effect on the surface, and improving the surface finish and processing accuracy. 4. The solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling described in the present invention, the polishing device for implementing the method has a reasonable structure and is easy to operate, and can meet the polishing needs of workpieces of different sizes and complex shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of a solid-liquid two-phase flow magnetic shear thickening and polishing device based on controllable multi-physical field coupling of the present invention.

[0007] Figure 2 It is a structural explosion diagram of a solid-liquid two-phase flow magnetic shear thickening and polishing device based on controllable multi-physical field coupling of the present invention.

[0008] Figure 3 This is a schematic diagram of a solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling according to the present invention.

[0009] In the figure: 1-base, 2-screw pump, 3-permanent magnet, 4-pole bracket, 5-circulation pipeline, 6-inlet flange, 7-baffle, 8-clamp, 9-workpiece, 10-positioning block, 11-positioning plate, 12-outlet flange, 13-circulation pipe flange. DETAILED DESCRIPTION

[0010] Specific implementation method 1: Combination Figure 1 and Figure 2 The device described in this embodiment includes a base 1, a screw pump 2, a permanent magnet 3, a pole support 4, a circulation pipe 5, an inlet flange 6, a baffle 7, a fixture 8, a workpiece 9, a positioning block 10, a positioning plate 11, an outlet flange 12, and a circulation pipe flange 13. The workpiece 9 in the device is clamped by the fixture 8, the positioning block 10 is mounted on the positioning plate 11 and fixed by a hexagon socket bolt, the fixture 8 in the device is installed in a groove formed by the positioning block 10, the baffle 7 in the device is installed on the positioning plate, the internal groove cooperates with the protrusion of the positioning block 10, and the device The outlet flange 12 is installed on the positioning plate 11, the baffle 7, the positioning plate 11, and the outlet flange 12 in the device are installed on the inlet flange 6 by long bolts, the inlet flange 6 in the device is connected to the outlet of the screw pump 2 by bolts, the circulation pipe flange 13 in the device is installed on the outlet flange 12 by bolt connection, the circulation pipe 5 in the device is installed on the circulation pipe flange 13, and the pipe outlet is opposite to the feed port of the screw pump 2, the permanent magnet 3 in the device is installed on the pole bracket 4 in a specific arrangement, and the pole bracket 4 in the device is installed on the outside of the baffle 7.

[0011] Specific implementation method 2: Combination Figure 3 The polishing principle of the solid-liquid two-phase magnetic shear thickening polishing based on controllable multi-physical field coupling described in this embodiment is explained. The polishing medium impacts the workpiece 9 under the transportation of the screw pump 2. The additives inside the polishing medium will agglomerate when contacting the fine structure of the surface of the workpiece 9, thereby causing the shear thickening effect. At the same time, the magnetic field provided by the permanent magnet 3 around the workpiece 9 will affect the iron powder in the polishing medium and produce a magnetization enhancement effect. Under the joint influence of shear thickening and magnetization enhancement effects, the polishing medium realizes material removal from the workpiece surface.

[0012] Specific implementation method three: Combination Figure 1 and Figure 2 Description: In this embodiment, the polishing steps are as follows using any one of the specific embodiments of the first or second specific embodiments:

[0013] (1) Install the workpiece 9 in the fixture 8 and install the remaining parts of the polishing device;

[0014] (2) Connect the circulation pipe flange 13 to the outlet flange 12 by bolts, install the circulation pipe 5 on the circulation pipe flange 13, and make the pipe outlet face the feed inlet of the screw pump 2;

[0015] (3) preparing a magnetic shear thickening polishing medium having dual stimulus responses of shear thickening and magnetization enhancement, wherein the polishing medium is a mixture of abrasives, magnetic particles, a dispersion medium, a dispersed phase and an additive, wherein the abrasive particles are selected from diamond, cubic boron nitride or silicon carbide; the magnetic particles are selected from carbonyl iron powder, ferroferric oxide or high-purity iron powder; the dispersion medium is selected from polyethylene glycol, deionized water, propylene glycol, mineral oil or vegetable oil; the dispersed phase is selected from silicon dioxide, polymethyl methacrylate or polyhydroxy polymer; the additive is selected from oleic acid, boric acid, guar gum, xanthan gum or polyvinylpyrrolidone;

[0016] (4) The permanent magnet 3 is mounted on the magnetic pole support 4 in a Halbach type, air gap excitation type or staggered arrangement manner, and the magnetic pole support 4 is mounted on the outside of the baffle 7;

[0017] (5) Add the polishing medium into the screw pump 2 and start the screw pump 2 at the same time. When the medium flows out from the circulation pipe 5, stop adding the medium and turn off the screw pump 2;

[0018] (6) The speed signal of the screw pump 2 is adjusted, and the polishing medium is delivered to the polishing area at a specific flow rate through the screw rotation and extrusion, thereby achieving efficient, high-quality and precise polishing of the workpiece 9 and achieving a mirror effect on the workpiece surface.

[0019] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned manner. Various non-substantial improvements made by using the method concept and technical solution of the present invention, or directly applying the above concept and technical solution of the present invention to other occasions without improvement, are all within the scope of protection of the present invention.

Claims

1. A solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling, the method comprising the following steps: (1) A polishing device for performing the method comprises a base (1), a screw pump (2), a permanent magnet (3), a magnetic pole support (4), a circulation pipeline (5), an inlet flange (6), a baffle (7), a fixture (8), a workpiece (9), a positioning block (10), a positioning plate (11), an outlet flange (12), and a circulation pipe flange (13); (2) A magnetic shear thickening polishing medium having dual stimulus responses of shear thickening and magnetization enhancement is prepared, wherein the polishing medium is a mixture of abrasives, magnetic particles, a dispersion medium, a dispersed phase and an additive, wherein the abrasive particles are selected from diamond, cubic boron nitride or silicon carbide; the magnetic particles are selected from carbonyl iron powder, ferroferric oxide or high-purity iron powder; the dispersion medium is selected from polyethylene glycol, deionized water, propylene glycol, mineral oil or vegetable oil; the dispersed phase is selected from silicon dioxide, polymethyl methacrylate or a polyhydroxy polymer; and the additive is selected from oleic acid, boric acid, guar gum, xanthan gum or polyvinylpyrrolidone; (3) fixing the magnetic pole support (4) in the polishing area, and configuring permanent magnets (3) of different distributions and polarities in the magnetic pole support (4), and changing the configuration of the permanent magnets (3) to thereby change the form of action of generating the magnetic field; the magnetic particles form magnetic dipoles under the action of the magnetic field and constrain each other to form a "flexible contour particle cluster"; (4) clamping the workpiece (9) on the fixture (8) and filling the circulation pipe (5) with the magnetic shear thickening polishing medium; (5) The speed signal of the screw pump (2) is adjusted, and the polishing medium is delivered to the polishing area at a specific flow rate through the rotation and extrusion of the screw. In the "flexible contour particle cluster", the dispersed medium and the dispersed phase have a clustering effect to generate an "enhanced flexible contour particle cluster". The degree of solidification of the polishing medium and the control force of the abrasive are controlled by precisely controlling the coupling effect of the magnetic field and the flow field, thereby achieving efficient, high-quality and precise polishing of the workpiece (9).

2. A solid-liquid two-phase flow magnetic shear thickening polishing device based on controllable multi-physical field coupling for executing the method of claim 1, characterized in that: The device comprises a base (1), a screw pump (2), a permanent magnet (3), a magnetic pole support (4), a circulation pipe (5), an inlet flange (6), a baffle (7), a fixture (8), a workpiece (9), a positioning block (10), a positioning plate (11), an outlet flange (12), and a circulation pipe flange (13), wherein the workpiece (9) is clamped by the fixture (8), the positioning block (10) is mounted on the positioning plate (11) and fixed by a hexagon socket bolt, the fixture (8) is mounted in a groove formed by the positioning block (10), the baffle (7) is mounted on the positioning plate, and the internal groove and the protrusion of the positioning block (10) are mutually engaged. The outlet flange (12) is mounted on the positioning plate (11); the baffle plate (7), the positioning plate (11) and the outlet flange (12) are mounted on the inlet flange (6) by means of long bolts; the inlet flange (6) is connected to the outlet of the screw pump (2) by means of bolts; the circulation pipe flange (13) is mounted on the outlet flange (12) by means of bolts; the circulation pipe (5) is mounted on the circulation pipe flange (13), and the pipe outlet is opposite to the feed inlet of the screw pump (2); the permanent magnet (3) is mounted on the magnetic pole bracket (4) in a specific arrangement; and the magnetic pole bracket (4) is mounted on the outside of the baffle plate (7).

3. The solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling according to claim 1 is characterized in that: The flow rate of the polishing medium is controlled by adjusting the rotation speed of the screw pump (2), and the magnetic field intensity in the polishing area is controlled by adjusting the number and arrangement of the permanent magnets (3).

4. The solid-liquid two-phase flow magnetic shear thickening polishing method based on controllable multi-physical field coupling according to claim 1, characterized in that: The permanent magnets (3) are arranged in the magnetic pole support (4) in a manner such as a Halbach type, an air gap excitation type or a staggered arrangement type.

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