A series electromagnet magnetic force polishing device and method

Abstract

The application relates to the technical field of magnetic force grinding, in particular to a magnetic force grinding device with series connection of magnetic poles, which comprises a series connection electromagnet assembly and a rotating mechanism, the series connection electromagnet assembly comprises a plurality of mutually screwed magnetic pole units and an upper conductive slip ring, the magnetic pole unit comprises an electromagnet shell, the upper part of the electromagnet shell is connected with an upper shell cover, an iron core is placed in the electromagnet shell, a wire is wound on the iron core, the top of the upper shell cover is connected with an upper sleeve, the bottom of the electromagnet shell is connected with a lower sleeve, the upper and lower ends of the wire can extend out of the upper sleeve and the lower sleeve, the adjacent upper sleeves and lower sleeves are threadedly connected, the upper and lower ends of the wire of the adjacent magnetic pole units are connected through a connecting head, the uppermost magnetic pole unit is connected with the upper conductive slip ring, and the lowermost magnetic pole unit is connected with the lower rotating mechanism. The application can realize length adjustment by series connection of multiple magnetic poles according to the depth of through holes. The synchronous polishing of the inner wall and the outer wall is completed at one time.

Description

Technical Field

[0001] This invention belongs to the field of magnetic polishing technology, and specifically relates to a magnetic polishing device using series electromagnets. Background Technology

[0002] Magnetic abrasive finishing, a non-contact precision machining technology, has seen rapid development in high-end manufacturing in recent years. Its core principle is to precisely control magnetic abrasives through a magnetic field to perform micro-cutting and polishing on the workpiece surface. Currently, this technology is widely used in the surface treatment of complex curved surfaces and high-precision parts such as medical devices, electronic components, and aerospace parts, with significant advantages, especially in removing micron-level burrs and improving surface roughness.

[0003] The main reasons currently hindering the large-scale application of magnetic grinding are as follows: low processing efficiency, high equipment cost, and complex matching of process parameters.

[0004] Current research on magnetic abrasive technology shows that while it performs well in high-precision surface treatment, it still has significant limitations. First, the equipment is expensive, relying on a precision magnetic field generator and a complex control system. Initial investment and maintenance costs far exceed those of traditional abrasive processes, limiting its application to small and medium-sized enterprises. Second, processing efficiency is low. Due to its reliance on micro-cutting mechanisms, material removal rates are low, making it difficult to meet the rapid processing needs of large batches or large quantities of workpieces. Third, material applicability is limited, primarily targeting magnetically conductive workpieces such as stainless steel and iron-based alloys. For non-magnetic materials such as aluminum, ceramics, and plastics, additional magnetization or composite processes are required, increasing complexity. Furthermore, optimizing process parameters is difficult. Variables such as magnetic field strength, abrasive particle size, and motion trajectory are interdependent, requiring repeated experimentation and adjustment, especially for irregularly shaped parts, which can easily lead to uneven processing. Finally, there are environmental and economic challenges. High-energy-consuming magnetic equipment has high operating costs, and magnetic abrasives are easily worn and difficult to recycle, potentially creating waste disposal problems. These shortcomings limit its widespread adoption in certain industrial scenarios, requiring further technological innovation to overcome these limitations.

[0005] The existing magnetic polishing devices have the following main shortcomings:

[0006] Material removal rate relies on the micron-level cutting and polishing of magnetic abrasives under the action of a magnetic field. The amount of material removed in a single process is extremely small, usually at the micron or even submicron level. Especially for hard materials or workpieces with large allowances, multiple processing cycles are required to achieve the target accuracy, significantly extending the process cycle.

[0007] Due to limitations in localized processing and the influence of magnetic field distribution, the effective processing area is usually concentrated near the magnetic poles, making it difficult to achieve large-area simultaneous and efficient processing.

[0008] Abrasive wear and maintenance costs: Magnetic abrasives are prone to breakage or loss of magnetism during processing due to friction and compression, requiring frequent replenishment or replacement, which increases downtime and limits continuous production.

[0009] When machining slender tubes, the magnetic field strength decreases with distance, and the internal space of the tube is limited, resulting in insufficient grinding pressure. At the same time, magnetic abrasive particles tend to accumulate at both ends of the tube, failing to uniformly cover the entire machining area, leading to low material removal rate and uneven surface quality. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a magnetic grinding device with series electromagnets, which is suitable for grinding deep hole parts of various lengths.

[0011] To achieve the above objectives, the present invention employs the following technical solution:

[0012] A magnetic grinding device with series magnetic poles includes a series electromagnet assembly and a rotating mechanism. The series electromagnet assembly includes multiple magnetic pole units screwed together and an upper conductive slip ring. Each magnetic pole unit includes an electromagnet housing, with an outer cover connected to the top of the electromagnet housing. An iron core is placed inside the electromagnet housing, and wires are wound around the iron core. An upper sleeve is connected to the top of the outer cover, and a lower sleeve is connected to the bottom of the electromagnet housing. The upper and lower ends of the wires can extend from the upper and lower sleeves. Adjacent upper and lower sleeves are threaded together. The upper and lower ends of the wires of adjacent magnetic pole units are connected by connectors. The uppermost magnetic pole unit is connected to the upper conductive slip ring, and the lowermost magnetic pole unit is connected to the rotating mechanism below.

[0013] The rotating mechanism includes a transmission housing, a lower conductive slip ring is provided inside the transmission housing, a bearing mounting block is connected above the lower conductive slip ring, the bearing mounting block is connected to a rotating shaft, a driven gear is connected to the top of the rotating shaft, the driven gear meshes with the driving gear, and the driving gear is connected to a stepper motor.

[0014] The vertically adjacent magnetic pole units are arranged vertically.

[0015] The upper conductive slip ring is threadedly connected to the upper sleeve of the uppermost magnetic pole unit, and the upper end of the wire of the uppermost magnetic pole unit is connected to the upper conductive slip ring. The upper conductive slip ring is connected to an external power source.

[0016] The lower sleeve of the lowest magnetic pole unit is threadedly connected to the shaft of the rotating mechanism, and the lower end of the wire of the lowest magnetic pole unit is connected to the lower conductive slip ring, which is connected to an external power source.

[0017] A method for operating a magnetic abrasive grinding device with series magnetic poles involves fixing a rotating mechanism connected to a lower conductive slip ring onto the worktable of a drilling / milling machine, ensuring that the rotating shaft of the rotating mechanism is coaxial with the spindle of the drilling / milling machine. The rotating shaft of the rotating mechanism is threadedly connected to the lowest magnetic pole unit. A sufficient number of magnetic pole units are installed in series according to the length of the pipe to be processed. The pipe to be processed is coaxially sleeved on the outside of the series magnetic pole units. The pipe to be processed is fixed with a worktable fixture. The highest magnetic pole unit is wired and installed to the upper conductive slip ring, which is connected to the spindle chuck of the drilling / milling machine. The upper and lower conductive slip rings are connected to a power source. After power is applied, magnetic abrasive material is adsorbed on the inner and outer surfaces of the pipe to be processed. The stepper motor of the rotating mechanism is controlled to rotate in both directions, thereby driving the series magnetic pole units to rotate and grinding the inner and outer surfaces of the pipe.

[0018] Compared with existing technologies, the beneficial effects of this invention are:

[0019] 1) This invention utilizes an electromagnet-type magnetic abrasive device with adjustable processing length. Multiple magnetic poles can be connected in series to adjust the length according to the depth of the through-hole. This solves the problems of extremely small material removal per processing cycle, difficulty in achieving large-area simultaneous and efficient processing, and the need for frequent abrasive replenishment or replacement in pipe fitting processing. For deep through-hole parts with large depth-to-diameter ratios and complex structures, simultaneous polishing of the inner and outer walls can be completed in one operation, avoiding the time-consuming operations of repeated disassembly and reversal in traditional processes, and significantly improving the processing efficiency of the inner wall.

[0020] 2) The device of this invention features multiple magnetic poles, resulting in a uniform magnetic field distribution and consistent grinding precision. The magnetic field strength can be adjusted in real time by changing the current parameters to accommodate different pore sizes and grinding amounts of material. Upon power failure, the magnetic poles are instantly demagnetized, and the abrasive can be quickly discharged by gravity or airflow, further reducing the frequency of manual intervention and meeting the needs of continuous production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the rotating mechanism connection.

[0023] Figure 3 This is a schematic diagram of a magnetic pole unit structure.

[0024] Figure 4 This is an illustration of the application of the present invention. Figure 1 .

[0025] Figure 5 This is an illustration of the application of the present invention. Figure 2 .

[0026] In the diagram: Magnetic pole unit 1, upper conductive slip ring 2, transmission housing 3;

[0027] 11. Electromagnet housing, 12. Outer cover, 13. Iron core, 14. Wire, 15. Upper sleeve, 16. Lower sleeve, 17. Female connector, 18. Male connector;

[0028] The components include a lower conductive slip ring 31, a bearing mounting block 32, a rotating shaft 33, a driven gear 34, a driving gear 35, and a stepper motor 36. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0031] like Figures 1-5 A magnetic grinding device with series magnetic poles includes a series electromagnet assembly and a rotating mechanism. The series electromagnet assembly includes multiple mutually screwed magnetic pole units 1 and an upper conductive slip ring 2. The magnetic pole unit 1 includes an electromagnet housing 11, an outer shell cover 12 connected to the top of the electromagnet housing 11, an iron core 13 placed inside the electromagnet housing 11, and wires 14 wound around the iron core 13. An upper sleeve 15 is connected to the top of the outer shell cover 12, and a lower sleeve 16 is connected to the bottom of the electromagnet housing 11. The upper and lower ends of the wires 14 can extend from the upper sleeve 15 and the lower sleeve 16. Adjacent upper sleeves 15 and lower sleeves 16 are threaded together. The upper and lower ends of the wires 14 of adjacent magnetic pole units 1 are connected by connectors. The upper end of the wire is a female connector 17, and the lower end of the wire is a male connector 18.

[0032] The uppermost magnetic pole unit 1 is connected to the upper conductive slip ring 2, and the lowermost magnetic pole unit 1 is connected to the lower rotating mechanism.

[0033] The rotating mechanism includes a transmission housing 3, a lower conductive slip ring 31 is provided inside the transmission housing 3, a bearing mounting block 32 is connected above the lower conductive slip ring 31, the bearing mounting block 32 is connected to a rotating shaft 33, the top of the rotating shaft 33 is connected to a driven gear 34, the driven gear 34 meshes with a driving gear 35, and the driving gear 35 is connected to a stepper motor 36.

[0034] The vertical arrangement of the adjacent magnetic pole units 1 ensures the stability of dynamic balance during rotation.

[0035] The upper conductive slip ring 2 is threadedly connected to the upper sleeve 15 of the uppermost magnetic pole unit 1. The upper end of the wire 14 of the uppermost magnetic pole unit 1 is connected to the wire of the upper conductive slip ring 2 through a connector. The upper conductive slip ring 2 is connected to an external power source.

[0036] The lower sleeve 16 of the lowest magnetic pole unit 1 is threadedly connected to the rotating shaft 33 of the rotating mechanism. The lower end of the wire 14 of the lowest magnetic pole unit 1 is connected to the wire of the lower conductive slip ring 31 through a connector to connect the lower conductive slip ring 31 to an external power source.

[0037] Work process:

[0038] Fix the rotating mechanism connected to the lower conductive slip ring 31 to the worktable of the drilling / milling machine, ensuring that the rotating shaft 33 of the rotating mechanism is coaxial with the spindle of the drilling / milling machine. Thread the rotating shaft 33 of the rotating mechanism to the lowest magnetic pole unit 1. Install enough magnetic pole units 1 in series according to the length of the pipe to be processed. Coaxially sleeve the pipe to be processed on the outside of the series magnetic pole units 1. Fix the pipe to be processed with the worktable fixture. Connect the uppermost magnetic pole unit 1 to the upper conductive slip ring 2. Connect the upper conductive slip ring 2 to the spindle chuck of the drilling / milling machine. Connect the upper conductive slip ring 2 and the lower conductive slip ring 31 to the power supply. After power is applied, the inner and outer surfaces of the pipe to be processed will attract magnetic abrasive. Control the stepper motor 36 to rotate in both directions, thereby driving the series magnetic pole units 1 to rotate and grind the inner and outer surfaces of the pipe.

[0039] To make the objectives, technical solutions, and technical effects of this invention clearer, the technical solutions in the embodiments of this invention are now described clearly and completely. However, the embodiments described below are only some embodiments of this invention, not all embodiments. All other embodiments obtained by those skilled in the art in conjunction with the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] Example:

[0041] A magnetic grinding device with series magnetic poles includes a series electromagnet assembly and a rotating mechanism. The series electromagnet assembly includes multiple mutually screwed magnetic pole units 1 and an upper conductive slip ring 2. The magnetic pole unit 1 includes an electromagnet housing 11, an outer shell cover 12 connected to the top of the electromagnet housing 11, an iron core 13 placed inside the electromagnet housing 11, and wires 14 wound around the iron core 13. An upper sleeve 15 is connected to the top of the outer shell cover 12, and a lower sleeve 16 is connected to the bottom of the electromagnet housing 11. The upper and lower ends of the wires 14 can extend from the upper sleeve 15 and the lower sleeve 16. Adjacent upper sleeves 15 and lower sleeves 16 are threaded together. The upper and lower ends of the wires 14 of adjacent magnetic pole units 1 are connected by connectors. The upper end of the wire is a female connector 17, and the lower end of the wire is a male connector 18.

[0042] The uppermost magnetic pole unit 1 is connected to the upper conductive slip ring 2, and the lowermost magnetic pole unit 1 is connected to the lower rotating mechanism.

[0043] The rotating mechanism includes a transmission housing 3, a lower conductive slip ring 31 is provided inside the transmission housing 3, a bearing mounting block 32 is connected above the lower conductive slip ring 31, the bearing mounting block 32 is connected to a rotating shaft 33, the top of the rotating shaft 33 is connected to a driven gear 34, the driven gear 34 meshes with a driving gear 35, and the driving gear 35 is connected to a stepper motor 36.

[0044] The vertical arrangement of the adjacent magnetic pole units 1 ensures the stability of dynamic balance during rotation.

[0045] The upper conductive slip ring 2 is threadedly connected to the upper sleeve 15 of the uppermost magnetic pole unit 1. The upper end of the wire 14 of the uppermost magnetic pole unit 1 is connected to the wire of the upper conductive slip ring 2 through a connector. The upper conductive slip ring 2 is connected to an external power source.

[0046] The lower sleeve 16 of the lowest magnetic pole unit 1 is threadedly connected to the rotating shaft 33 of the rotating mechanism. The lower end of the wire 14 of the lowest magnetic pole unit 1 is connected to the wire of the lower conductive slip ring 31 through a connector to connect the lower conductive slip ring 31 to an external power source.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for operating a magnetic grinding device with series magnetic poles, characterized in that, The magnetic grinding device with series magnetic poles includes a series electromagnet assembly and a rotating mechanism. The series electromagnet assembly includes multiple magnetic pole units that are screwed together and an upper conductive slip ring. Each magnetic pole unit includes an electromagnet housing. An outer cover is connected to the top of the electromagnet housing. An iron core is placed inside the electromagnet housing, and a wire is wound around the iron core. An upper sleeve is connected to the top of the outer cover, and a lower sleeve is connected to the bottom of the electromagnet housing. The upper and lower ends of the wire can extend from the upper and lower sleeves. Adjacent upper and lower sleeves are threaded together. The upper and lower ends of the wires of adjacent magnetic pole units are connected through a connector. The uppermost magnetic pole unit is connected to the upper conductive slip ring, and the lowermost magnetic pole unit is connected to the rotating mechanism below. The rotating mechanism includes a transmission housing, a lower conductive slip ring is provided inside the transmission housing, a bearing mounting block is connected above the lower conductive slip ring, the bearing mounting block is connected to a rotating shaft, a driven gear is connected to the top of the rotating shaft, the driven gear meshes with a driving gear, and the driving gear is connected to a stepper motor. Work methods: Fix the rotating mechanism with the lower conductive slip ring connected to the worktable of the drilling / milling machine, ensuring that the rotating shaft of the rotating mechanism is coaxial with the spindle of the drilling / milling machine. Connect the rotating shaft of the rotating mechanism to the lowest magnetic pole unit via thread. Install a sufficient number of magnetic pole units in series according to the length of the pipe to be processed. Coaxially fit the pipe to be processed on the outside of the series magnetic pole units. Fix the pipe to be processed with the worktable fixture. Connect the uppermost magnetic pole unit to the upper conductive slip ring. Connect the upper conductive slip ring to the spindle chuck of the drilling / milling machine. Connect the upper and lower conductive slip rings to the power supply. After power is applied, the inner and outer surfaces of the pipe to be processed will attract magnetic abrasive. Control the stepper motor of the rotating mechanism to rotate in both directions, thereby driving the series magnetic pole units to rotate and grinding the inner and outer surfaces of the pipe.

2. The operating method of the magnetic grinding device with series magnetic poles according to claim 1, characterized in that, The vertically adjacent magnetic pole units are arranged vertically.

3. The operating method of the magnetic grinding device with series magnetic poles according to claim 1, characterized in that, The upper conductive slip ring is threadedly connected to the upper sleeve of the uppermost magnetic pole unit, and the upper end of the wire of the uppermost magnetic pole unit is connected to the upper conductive slip ring. The upper conductive slip ring is connected to an external power source.

4. The operating method of the magnetic grinding device with series magnetic poles according to claim 1, characterized in that, The lower sleeve of the lowest magnetic pole unit is threadedly connected to the shaft of the rotating mechanism, and the lower end of the wire of the lowest magnetic pole unit is connected to the lower conductive slip ring, which is connected to an external power source.

Images