CN108311961B - Circulation static pressure type magnetorheological polishing device - Google Patents
Circulation static pressure type magnetorheological polishing device Download PDFInfo
- Publication number
- CN108311961B CN108311961B CN201810379340.8A CN201810379340A CN108311961B CN 108311961 B CN108311961 B CN 108311961B CN 201810379340 A CN201810379340 A CN 201810379340A CN 108311961 B CN108311961 B CN 108311961B
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- China
- Prior art keywords
- polishing head
- workpiece
- polishing
- static pressure
- excitation
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- 238000005498 polishing Methods 0.000 title claims abstract description 121
- 230000003068 static effect Effects 0.000 title claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 39
- 230000005284 excitation Effects 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/005—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using a magnetic polishing agent
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a circular static pressure type magnetorheological polishing device which comprises an excitation device, magnetorheological fluid and a polishing head, wherein a cavity is formed in the polishing head, holes are circumferentially distributed in the polishing head, and fine pits are formed in the surface of the polishing head. The polishing head is arranged at the center of the inner wall of the workpiece, and the workpiece is arranged in the range of a magnetic field generated by the excitation device. The exciting device comprises a permanent magnet and an electromagnet, the intensity of the magnetic field intensity can be controlled by controlling the current of the exciting device, and the curing degree of the magnetorheological fluid between the polishing head and the inner wall of the workpiece is further controlled, so that the surface material of the workpiece is sheared and removed in the relative movement of the polishing head and the workpiece. The magnetorheological fluid polishing device is simple in structure, small in size and strong in controllability, magnetorheological fluid flows out from the three rectangular holes in the polishing head under the rotation action of a workpiece, pressure is uniformly applied to the surface of the workpiece, isostatic pressure can be realized inside the workpiece, and the polishing treatment on the inner wall surface of the workpiece is completed through the relative motion of the polishing head and the workpiece.
Description
Technical Field
The invention relates to the field of magnetorheological polishing, in particular to a circulation static pressure type magnetorheological polishing device for processing the inner surface of a slender non-magnetic conduction pipe.
Background
The magnetorheological polishing technology is an ultra-precise processing method for polishing by utilizing the rheological property of the magnetorheological fluid in a magnetic field. The magnetic rheological liquid is suspension formed by mixing micro soft magnetic particles with high magnetic conductivity and low magnetic hysteresis and non-magnetic liquid. Has the characteristics of magnetic property, rheological property, stability and the like.
The magnetorheological polishing technology is a polishing method which utilizes the magnetorheological fluid to generate rheology in a gradient magnetic field to form rapid relative motion between a flexible small grinding head with visco-plastic behavior and a workpiece, so that the surface of the workpiece is subjected to great shearing force, and the surface material of the workpiece is removed.
The magnetorheological polishing technology is a polishing method between contact polishing and non-contact polishing, compared with the traditional polishing method, the magnetorheological polishing technology has the advantages of high polishing precision, no tool abrasion and blockage, high removal rate, no introduction of subsurface damage and the like, and can realize near-zero subsurface damage and nano-scale precision polishing.
The prior art (for example, chinese patent document CN1486821A and chinese patent document CN106736879A) has disclosed an implementation of a magnetorheological polishing technology, and specifically discloses a technical solution for polishing the outer surface of a workpiece, but because the device occupies a large area and can only polish the outer surface of the workpiece, the application scenarios are greatly limited.
In order to solve the above technical problems, chinese patent document CN107825230A discloses a composite magnetic field type magnetorheological polishing head for polishing the inner wall of a tubular workpiece, and specifically discloses a composite magnetic field type magnetorheological polishing head for polishing the inner wall of a tubular workpiece, which realizes reduction of the space volume occupied by an excitation device and polishing operation of the inner wall of a pipe.
However, in the solution disclosed in CN107825230A, although the overall volume of the apparatus has been greatly reduced, the polishing head still has a large volume and a large diameter, and thus the polishing operation on the inner wall of the extremely thin pipe cannot be completed.
disclosure of Invention
Technical problem to be solved
The invention provides a circulating static pressure type magnetorheological polishing device, which aims to solve the technical problem that the existing magnetorheological polishing device is large in size and cannot finish polishing operation on the inner wall of an extremely thin pipe.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
The polishing head comprises a cavity, the magnetorheological fluid is contained in the cavity, and holes are distributed in the circumferential direction of the polishing head and used for enabling the magnetorheological fluid to flow out of the cavity under the excitation of the excitation device.
According to the invention, the surface of the polishing head is subjected to micro-milling, and the originally smooth surface is provided with the fine pits which can drive the magnetorheological fluid to move relative to the workpiece.
According to the invention, the electromagnet comprises a U-shaped iron core and excitation coils, wherein the excitation coils are wound on two sides of the U-shaped iron core, and two permanent magnets with opposite polarities are fixedly connected with two ends of an opening of the electromagnet in parallel and oppositely.
According to the invention, the diameter of the polishing head is about 1mm to 3mm, preferably 2mm, smaller than the workpiece to be machined. According to the invention, the permanent magnet in the excitation device is a neodymium iron boron magnet.
According to the invention, the polishing head is a non-magnetic conducting material.
According to the invention, the holes distributed in the circumferential direction of the polishing head are three rectangular holes, and the interval between two adjacent rectangular holes is 120 degrees.
(III) advantageous effects
The invention has the beneficial effects that: simple structure, small size, no need of cooling device and strong controllability.
The polishing head and the excitation device are arranged in a non-contact manner, so that the limitation of the excitation device on the design size of the polishing head is eliminated. A cavity is arranged in the polishing head and can store magnetorheological fluid, holes are distributed in the circumferential direction of the polishing head and are used for enabling the magnetorheological fluid to flow out of the cavity under the excitation of an excitation device, a plurality of pits are distributed in the surface of the polishing head and can drive the magnetorheological fluid and a workpiece to move relatively so that the magnetorheological fluid with isostatic pressure can be transmitted to the inner wall of the workpiece uniformly. The exciting device combines the electromagnet and the permanent magnet, and compared with a pure permanent magnet or electromagnet, by introducing the composite magnetic field, the controllability and the dynamic property of the magnetic field are improved, the adjustable range of the magnetic field intensity is enlarged, the current required for adjusting the magnetic field intensity is smaller, the number of turns of a coil is smaller, the heat generation of the exciting device is reduced, the size of the exciting device is reduced, and the accurate adjustment of the size of the magnetic field in a polishing area can be realized. The excitation device and the polishing head are separated and positioned outside the polishing head, so that the volume of the polishing head is reduced, the structure is simplified, and the polishing operation on the inner wall of the extremely thin pipe can be realized.
drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is an enlarged view of a portion of the polishing head of the present invention.
[ description of reference ]
1: a magnet frame core;
2: a neodymium iron boron magnet;
3: a workpiece;
4: a polishing head;
5: magnetorheological fluid;
6: and a field coil.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
the invention provides a circular flow static pressure type magnetorheological polishing device, which polishes by utilizing the principle that the curing degree of magnetorheological fluid in a certain magnetic field intensity range is influenced by the magnetic field intensity. Under the action of a magnetic field, the magnetorheological fluid is in a semi-solid state, the yield stress is obviously increased, and in a certain range, the magnitude of the yield stress is increased along with the enhancement of the magnetic field strength.
As shown in fig. 1, a U-shaped iron core 1 is used as a base, excitation coils 6 are wound on two sides of the U-shaped iron core 1, and two permanent magnets neodymium iron boron magnets 2 with opposite polarities are fixedly connected to two ends of an opening of the U-shaped iron core to jointly form an excitation device.
Accordingly, the polishing head 4 is disposed within the magnetic field formed at the opening of the U-shaped iron core, preferably, at the symmetrical center position between the two permanent magnets, neodymium iron boron magnet 2.
As shown in fig. 2, the polishing head is columnar, and the axial direction thereof is arranged in the thickness direction of the U-shaped iron core. Both ends of the polishing head are fixedly supported by holding mechanisms. The holding mechanism is held from both ends of the polishing head and can be realized by providing an axial clamping force to the polishing head. The holding structure is designed on the basis of not interfering with the workpiece, for example, the dimension in the radial direction is smaller than or equal to the radial dimension of the polishing head, and the specific structure thereof can adopt any manner in the prior art, and the invention is not limited thereto. In this way, the polishing head is formed independently of the excitation device, the two being kept separate, i.e. there is no structural connection between the two.
The workpiece 3 performs high-speed rotary motion around the central axis of the workpiece 3 relative to the polishing head 4, the polishing head 4 is arranged in a cylindrical inner hole of the workpiece 3 and is concentrically arranged relative to the cylindrical inner hole, and the workpiece 3 performs reciprocating linear motion relative to the polishing head 4 along the central axis direction of the cylindrical inner hole of the workpiece. Specifically, during polishing, the excitation device and the polishing head 4 are relatively stationary, and the workpiece 3 makes reciprocating linear motion along the central axis direction relative to the excitation device and the polishing head. Therefore, the thickness of the U-shaped iron core can be thinner, and the volume of the circular static pressure type magnetorheological polishing device provided by the invention is further reduced.
As shown in fig. 2, the polishing head 4 is a cylindrical structure having a cavity therein, preferably closed at both ends. Three rectangular holes with intervals of 120 degrees are uniformly distributed in the circumferential direction of the polishing head 4, the opening is rectangular, the transverse slotting width can be reduced, the magnetorheological fluid 5 can flow out more uniformly and smoothly at the intervals of 120 degrees, excessive pressure of the opening cannot be constant, and the polishing requirement can not be met by the insufficient holes and the flow of the magnetorheological fluid 5. The diameter of the polishing head 4 is about 1 mm-3 mm smaller than the diameter of the workpiece 3, the polishing gap is too large and has no effect, the polishing gap is too small, the polishing head 4 is inconvenient to mount and difficult to install, and when the workpiece 3 and the polishing head 4 move relatively, the polishing head 4 can contact the surface of the workpiece 3 due to the possibility of vibration of the device, and the surface of the workpiece 3 is scratched, so the polishing head 4 and the workpiece 3 are preferably 2mm, and a reasonable gap capable of containing the magnetorheological fluid 5 is formed between the polishing head 4 and the workpiece 3. The surface of the polishing head 4 is subjected to micro milling, and a fine pit is formed, so that the magnetorheological fluid in the gap can be attached to the surface of the polishing head 4.
When the magnetorheological fluid works, the magnet exciting coil 6 is electrified to enable the magnetic field generated by the magnet exciting device to be superposed with the magnetic field generated by the neodymium iron boron magnet 2, when the directions of the magnetic field generated by the electromagnet and the magnetic field of the permanent magnet are the same, the total magnetic field intensity generated by the magnet exciting device is enhanced, and the curing degree of the magnetorheological fluid 5 is increased; when the direction of the magnetic field generated by the electromagnet is opposite to that of the magnetic field of the permanent magnet, the total magnetic field intensity of the excitation device is reduced, and the curing degree of the magnetorheological fluid is reduced. The curing degree of the magnetorheological fluid can be controlled by adjusting the direction and the size of the current passing through the exciting coil, the curing degree is the morphological change of the magnetorheological fluid along with the change of the magnetic field, the higher the curing degree is, the higher the strength of a magnetic chain formed by the magnetorheological fluid is, and the higher the shearing force required for damaging the chain structure in the vertical direction is. Theoretically, the polishing effect becomes better as the degree of curing increases within a certain range, and beyond this range, the polishing effect becomes worse.
Compared with a magnetorheological fluid polishing device which only uses a permanent magnet as an excitation device, the magnetorheological fluid polishing device can only indirectly adjust the magnetic field intensity of a polishing area by adjusting the distance between the permanent magnet and the inner wall of a polishing shaft or the distance between the outer wall of the polishing shaft and the polished surface of a workpiece, and the excitation device of the circulation static pressure type magnetorheological fluid polishing device provided by the invention is separated from the polishing head and is added with an electromagnet, so that the adjustment of the magnetic field intensity generated by the excitation device is more accurate, the adjustable range is wider, and the controllability is improved; compared with a magnetorheological fluid polishing device which only uses an electromagnet as an exciting device, the circulating static pressure type magnetorheological fluid polishing device provided by the invention has the advantages that the permanent magnet is added for achieving the required magnetic field intensity, the current passing through the exciting coil is increased, the number of turns of the coil of the exciting coil is increased, the volume of the device is increased, and the heating is serious after long-time use.
The magnetorheological fluid 5 is conveyed into the cavity of the polishing head 3, when the polishing head 4 and the workpiece 3 move relatively, the magnetorheological fluid 5 flows into a gap between the workpiece 3 and the polishing head 4 from the rectangular hole on the polishing head 3, a closed space is formed between the pipe wall and the polishing head along with the relatively high-speed rotary motion between the workpiece and the polishing head, the magnetorheological fluid in the polishing head flows out uniformly, isostatic-pressure magnetorheological fluid can be formed, and the pressure is transmitted to the inner wall of the workpiece uniformly. The fine pits on the surface of the polishing head 4 can store the magnetorheological fluid 5, and when the workpiece 3 moves relative to the polishing head 4 at a high speed in a circumferential direction around the central axis of the workpiece 3, the magnetorheological fluid 5 is driven to move relative to the workpiece 3, so that the frictional resistance from the inner surface of the workpiece 3 is borne, and the inner surface of the workpiece 3 is sheared and removed.
because the excitation device is separated from the polishing head 4 and is positioned outside the polishing head 4, the diameter of the polishing head 4 can reach a minimum value, and the polishing operation on the inner surface of the superfine pipe can be completed. It should be noted that although the present invention can polish the inner surface of the ultra-fine pipe, it is not limited to polishing the inner surface of the ultra-fine pipe. The invention is worth eliminating the limitation of the excitation device on the size of the polishing head, and does not mean that the invention can only be used for polishing the inner surface of an extremely fine pipe.
it should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (7)
1. A kind of circulation static pressure type magnetic current becomes the buffing attachment, including exciter, magnetic current becomes liquid, buffing head, characterized by that: the polishing head is separately and fixedly arranged in a magnetic field range generated by the excitation device relative to the excitation device, and the excitation device is positioned outside the polishing head;
The polishing head comprises a cavity, the magnetorheological fluid is contained in the cavity, and holes are distributed in the circumferential direction of the polishing head and used for enabling the magnetorheological fluid to flow out of the cavity under the excitation of the excitation device.
2. The toroidal static pressure magnetorheological finishing device according to claim 1, wherein: a plurality of pits are distributed on the surface of the polishing head.
3. The toroidal static pressure magnetorheological finishing device according to claim 1, wherein: the diameter of the polishing head is 1 mm-3 mm smaller than that of the workpiece to be processed.
4. The toroidal static pressure magnetorheological finishing device according to claim 1, wherein: the holes distributed in the circumferential direction of the polishing head are three rectangular holes distributed uniformly, and the interval between every two adjacent rectangular holes is 120 degrees.
5. the toroidal static pressure magnetorheological finishing device according to claim 1, wherein: the electromagnet comprises a U-shaped iron core and excitation coils, the excitation coils are wound on two sides of the U-shaped iron core, and two permanent magnets with opposite polarities are fixedly connected to two ends of the opening of the electromagnet in parallel and oppositely.
6. The toroidal static pressure magnetorheological finishing device according to claim 5, wherein: the permanent magnet in the excitation device is a neodymium iron boron magnet.
7. The toroidal static pressure magnetorheological finishing device according to any one of claims 1 to 6, wherein: the polishing head is made of a non-magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810379340.8A CN108311961B (en) | 2018-04-25 | 2018-04-25 | Circulation static pressure type magnetorheological polishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810379340.8A CN108311961B (en) | 2018-04-25 | 2018-04-25 | Circulation static pressure type magnetorheological polishing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108311961A CN108311961A (en) | 2018-07-24 |
| CN108311961B true CN108311961B (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810379340.8A Expired - Fee Related CN108311961B (en) | 2018-04-25 | 2018-04-25 | Circulation static pressure type magnetorheological polishing device |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109773604A (en) * | 2018-12-26 | 2019-05-21 | 河海大学常州校区 | A kind of automatic controllable device and method of removal intersection hole bur |
| CN110064997A (en) * | 2019-06-05 | 2019-07-30 | 中国工程物理研究院机械制造工艺研究所 | Mangneto rheological deformation effect burnishing device and method for thin wall special-shaped curved surface |
| CN111687696A (en) * | 2020-07-25 | 2020-09-22 | 浙江师范大学 | Flexible polishing head based on magnetorheological elastomer |
| CN112139970A (en) * | 2020-10-09 | 2020-12-29 | 豪利机械(苏州)有限公司 | Method for polishing inner wall of conical hole |
| CN113910009B (en) * | 2021-10-18 | 2023-08-15 | 台州学院 | Magnetorheological fluid polishing bullet polishing machine |
| CN113977360B (en) * | 2021-10-18 | 2023-08-25 | 台州学院 | Reciprocating self-control rotary magnetic field magneto-rheological polishing machine |
| CN114102420B (en) * | 2021-11-16 | 2024-01-30 | 台州学院 | Multistage uniform-speed self-circulation magnetorheological polishing machine |
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| CN104308671A (en) * | 2014-10-09 | 2015-01-28 | 东北大学 | Magnetorheological polishing device and method |
| CN205520755U (en) * | 2016-04-13 | 2016-08-31 | 童和平 | Finger -like electromagnet structure magnetic current becomes throwing optical equipment |
| CN206305892U (en) * | 2016-12-12 | 2017-07-07 | 东北大学 | A kind of roller type magnetorheological finishing device |
| CN107791107A (en) * | 2017-11-16 | 2018-03-13 | 东北大学 | A kind of titanium alloy tube inwall magnetic rheological polishing method and device |
| CN107825230A (en) * | 2017-11-23 | 2018-03-23 | 东北大学 | A kind of resultant field formula MRF head |
| CN207155395U (en) * | 2017-08-25 | 2018-03-30 | 河北工程大学 | A kind of magnetic flow liquid burnishing device |
-
2018
- 2018-04-25 CN CN201810379340.8A patent/CN108311961B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104308671A (en) * | 2014-10-09 | 2015-01-28 | 东北大学 | Magnetorheological polishing device and method |
| CN205520755U (en) * | 2016-04-13 | 2016-08-31 | 童和平 | Finger -like electromagnet structure magnetic current becomes throwing optical equipment |
| CN206305892U (en) * | 2016-12-12 | 2017-07-07 | 东北大学 | A kind of roller type magnetorheological finishing device |
| CN207155395U (en) * | 2017-08-25 | 2018-03-30 | 河北工程大学 | A kind of magnetic flow liquid burnishing device |
| CN107791107A (en) * | 2017-11-16 | 2018-03-13 | 东北大学 | A kind of titanium alloy tube inwall magnetic rheological polishing method and device |
| CN107825230A (en) * | 2017-11-23 | 2018-03-23 | 东北大学 | A kind of resultant field formula MRF head |
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| Publication number | Publication date |
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| CN108311961A (en) | 2018-07-24 |
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