CN101293335A - Magnetic grinding device - Google Patents

Abstract

A magnetic grinding device has a tubular handle (1) with a central through hole. Sleeve (10) is housed on the handle of a knife (1). A conduit (8) is housed in the central through hole of the handle of a knife (1). A magnetic isolation material (7) and a magnet (9) are provided on the handle (1) between the conduit (8) and the sleeve (10). A sheet metal (11) is set towards one end of the sleeve (10) of the handle of a knife (1). A grinding head (13) is arranged at the outer end of the sheet metal (11). The sheet metal (11) has a layer of annular lower end cover (12) along the edge to cover the edge and the lower end surface of the sleeve (10). The sleeve (10) is generally made of non-magnetic metal, and the invention realizes the optimization of the magnetic field and the automatic replenishment of abrasives and grinding liquid, and effectively improves the removal efficiency. It can be widely used in large-area surface grinding of various parts, and can realize surface precision processing of small and complex three-dimensional curved surfaces.

Description

Magnetic grinding device

technical field

The invention relates to a grinding device, and further refers to a magnetic grinding device for processing with the assistance of a magnetic field.

Background technique

The existing technology is to place the workpiece between the N pole and the S pole, and then put in magnetic particles as abrasives. Abrasives are arranged in the magnetic field along the direction of the magnetic force lines to form magnetic grinding brushes. When the workpiece moves relative to the magnetic poles, the magnetic grinding brushes grind the surface of the workpiece. During grinding, the surface of the abrasive is magnetized, causing it to be attracted by the magnetic force on the surface of the workpiece, and the abrasive is stirred at the lower end, which leads to the refinement, crushing, and reduction of the sharpness of the abrasive particles, and even some abrasive remains, making the relative motion between the abrasive and the workpiece change. Weakness, the number of abrasives gradually decreases, and the sharpness of the cutting edge decreases, making it difficult to maintain long-term large-area processing, resulting in a decrease in grinding quality and grinding efficiency. This requires periodic replacement of abrasives and the addition of abrasive fluids for cooling and lubrication. However, the traditional method is to inject the mixture of the previously mixed abrasive liquid and magnetic abrasive during the processing. The disadvantage of this method is that the mixture is not mixed enough, the grinding liquid is lost prematurely, and the replacement and lubrication of the abrasive are limited, which will affect the processing effect, making it difficult to realize automatic processing.

Contents of the invention

The technical problem to be solved by the present invention is to propose a magnetic grinding device for the deficiencies of the prior art, which can implement continuous processing without abrasive residues, thereby achieving high-efficiency grinding effects.

The technical solution of the present invention is that the magnetic grinding device, referring to FIG. 1 , has a tubular handle 1 with a central through hole. A sleeve 10 is sleeved on the coaxial line on the knife handle 1 . One axial end of the sleeve 10 is fixed on the handle 1 through the upper nut 2 and the upper positioning pin 4 . A conduit 8 is sheathed on the coaxial line in the central through hole of the knife handle 1 . The knife handle 1 between the conduit 8 and the sleeve 10 is provided with two radially spaced and symmetrically distributed cross-sections, the size of the inner arc is matched with the diameter of the conduit 8, The magnetic isolation material 7 and the magnet 9 whose outer arc size matches the inner diameter of the sleeve 10 . Wherein the magnet 9 is corrugated. A sheet metal 11 is sheathed on the end of the knife handle 1 facing the end of the sleeve 10 . An annular rubber gasket 15 may be arranged between the axial inner end of the sheet metal 11 and the magnetic isolation material 7 and the magnet 9 in the sleeve 10 . A grinding head 13 is provided on the axially outer end of the sheet metal 11 . The cross-section of the sheet metal 11 is convex and has a rim, and the rim of the sheet metal 11 is provided with a layer of annular lower end cap 12 to cover the rim and the lower end surface of the sleeve 10 in a closed manner, and the lower nut 3 penetrates the lower end cap 12 to The sheet metal 11 with the grinding head 13 is fixed on the sleeve 10 of the handle 1 and positioned by the positioning pin 14 . An annular rubber gasket 5 may also be arranged between the other end of the sleeve 10 and the handle body of the knife handle 1 . An annular iron sheet 6 can also be arranged between the rubber gasket 5 and the magnetic isolation material 7 and the magnet 9 in the sleeve 10 .

In the magnetic grinding device of the present invention composed of the above components, the sleeve 10 is generally made of non-magnetic metal, and a plurality of permanent magnets 9 are placed in the middle, and each magnet 9 is separated by a magnetic isolation material 7 . An iron sheet 6 is placed on the upper end of the magnet 9 to form a magnetic field circuit to achieve the purpose of strengthening the magnetic field. A rubber gasket 5 is placed between the knife handle 1 and the iron sheet 6, which is used for axially compressing the magnet and has a vibration isolation function. Between the corresponding magnets 9, a conduit 8 is connected to the center hole tube of the knife handle 1 at the upper end and the sheet metal 11 at the lower end to form an integral through hole. The grinding head 13 is directly connected to the lower end of the magnet through the lower end cover 12 , and the grinding head 13 isolates the corresponding magnet 9 through the sheet metal 11 . The lower end cover 12 is affixed to the sleeve 10 through the nut 3 and positioned through the positioning pin 14 . For increasing the magnetic field strength, grooves can also be offered at the grinding head 13 ends. Because symmetrical magnetic poles are installed in the grinding head 13 to form a self-closed magnetic circuit, most of the lines of force flow from the N pole in the magnetic pole to the S pole through the magnetic grinding brush, and only a small part flows to the workpiece. In this way, the degree to which the magnetic abrasive is attracted by the workpiece is reduced, thereby greatly reducing the residue of the abrasive. At the same time, through the central through hole, without interrupting the grinding process, the device uses the external pressure pump to automatically inject supplementary granular abrasives and grinding liquid into the magnetic grinding brush in the processing area, effectively realizing continuous processing and achieving In order to improve the grinding efficiency.

When the magnetic grinding device of the present invention is used, it is directly installed on the machine tool through the universal tool handle, and rotates at high speed with the working spindle. After the grinding head 13 is magnetized by the permanent magnet 9, an optimized magnetic field is formed on the outside, which can absorb mixed magnetic abrasives, such as the mixed magnetic abrasives of known technology, to form a magnetic brush to process the workpiece; When the liquid is lost, the external pressure pump can continue to provide the required abrasive and grinding liquid to the magnetic brush in the processing area through the pipe hole in the middle of the device without interrupting the processing procedure. This saves replacement time and achieves the purpose of improving processing efficiency. Due to the flexibility and elasticity of the magnetic grinding brush, it is possible to process fine and complex curved surfaces without strict CNC (Chinese translation: computer numerical control) trajectory control.

The above solutions related to the present invention and the preferred embodiments described in detail below are not intended to limit the protection scope of the present invention. Other equivalent changes or substitutions that do not depart from the structure of the present invention shall be included in the protection scope of the present invention.

The beneficial effect of the present invention is that the present invention realizes the optimization of the magnetic field by adopting the permanent magnets of different strengths and their dispersed placement, and realizes the automatic replenishment of the abrasive material and the grinding liquid by using the principle of internal water outlet. Thus, the material removal efficiency is effectively improved. The device can be widely used in large-area surface grinding of various parts, and can realize surface precision processing of small and complex three-dimensional curved surfaces. Compared with the conventional magnetic grinding machine, the processing efficiency can be effectively improved, and the manufacture and assembly are simple. The device does not need the assistance of special magnetic grinding equipment, and only needs to directly use the existing vertical milling machine to realize the magnetic grinding process.

Description of drawings

Fig. 1 is the structural representation of a specific embodiment of magnetic grinding device of the present invention;

Fig. 2 is a sectional view along line A-A in Fig. 1 .

The labels in Figures 1 to 2 are:

1-knife handle, 2-upper nut,

3-Nut at the lower end, 4-Location pin at the upper end,

5-rubber gasket, 6-iron sheet,

7-Magnetic isolation material, 8-Conduit,

9-magnet, 10-sleeve,

11-sheet gold, 12-lower end cap,

13-grinding head, 14-lower positioning pin,

15 - Rubber gasket.

Detailed ways

Referring to accompanying drawings 1-2, the tool holder 1 of the magnetic grinding device of the present invention adopts a commercially available model of BT40, a tubular universal tool holder with a central through hole for machine tool connection. The sleeve 10 is made of a non-magnetic metal cylindrical profile. The sleeve 10 is coaxially set on the handle 1, connected with the handle 1 through the nut 2 at the upper end, and positioned with the positioning pin 4 at the upper end. The conduit 8 is coaxially sleeved in the central through hole of the handle 1 . The knife handle 1 between the conduit 8 and the sleeve 10 is provided with a section radially spaced in two phases and symmetrically distributed, the size of the inner arc matches the diameter of the conduit 8, and the outer arc 4 pieces of N-50 type corrugated permanent powerful magnets 9 whose size is matched with the inner diameter of the sleeve 10. Magnetic isolation material 7 is filled between every two magnets 9, and for making the magnetic force concentrate, the thick iron sheet of 1mm is also wrapped around the periphery. The cross-section is convex and has a sheet metal 11 along the edge set on the end of the handle 1 facing the end of the sleeve 10 . An annular rubber gasket 15 is provided between the axial inner end of the sheet metal 11 and the magnetic isolation material 7 and the magnet 9 in the sleeve 10 . A grinding head 13 is provided on the axially outer end of the sheet metal 11 . The grinding head 13 is divided into four pieces corresponding to the upper end magnet 9 by the sheet metal 11 . After the grinding head 13 is magnetized, a magnetic field distribution with four polarities, that is, N-S-N-S polarities, is formed outside. To increase the magnetic field strength, grooves can be provided at the bottom of the grinding head 13 . The ring-shaped lower end cover 12 covers the edge of the sheet metal 11 in a closed manner. The lower end nut 3 penetrates the lower end cover 12 to fix the sheet metal 11 with the grinding head 13 on the sleeve 10 of the handle 1 . The ring-shaped rubber gasket 5 is arranged between the other end of the sleeve 10 and the handle body of the handle 1 for axially compressing the magnet and vibration isolation. A ring-shaped iron sheet 6 is used to form a magnetic field circuit and strengthen the magnetic field between the rubber gasket 5 and the magnetic isolation material 7 and the magnet 9 in the sleeve 10 .

The magnetic grinding device of the present invention thus constituted is proved to be effective through trial production and probation, and fully meets the design requirements.

Claims (5)

1. A magnetic grinding device having a tubular handle (1) with a central through hole, characterized in that a sleeve (10) is set on the coaxial line on the handle (1), and the sleeve (10) ) is fixed on the handle (1) through the upper end nut (2), and a guide tube (8) is set coaxially in the center through hole of the handle (1), and the guide tube (8) is connected with the sleeve ( 10) on the knife handle (1) between is provided with its cross-section radially two-phase spaced and symmetrically distributed, the size of its inner arc is matched with the pipe diameter of the conduit (8), and its outer circle The size of the radian matches the magnetic isolation material (7) and the magnet (9) of the inner diameter of the sleeve (10), and the end of the knife handle (1) is set towards the end of the sleeve (10) with a piece of sheet metal (11 ), the axial outer end of the sheet metal (11) is provided with a grinding head (13), the cross section of the sheet metal (11) is convex and has an edge, and the sheet metal (11) has a layer of annular lower end cover (12) along the edge. The lower end surface of the above-mentioned sleeve (10) is closed and covered, and the lower end nut (3) penetrates the lower end cover (12) to fix the sheet metal (11) with the grinding head (13) on the sleeve of the handle (1) (10) on. 2. The magnetic grinding device according to claim 1, characterized in that, an annular rubber gasket (5) is also provided between the sleeve (10) and the handle body of the handle (1). 3. The magnetic grinding device according to claim 1, characterized in that there is a ring between the axial inner end of the sheet metal (11) and the magnetic isolation material (7) and the magnet (9) in the sleeve (10). shaped rubber gasket (15). 4. The magnetic grinding device according to claim 1, characterized in that, between the rubber gasket (5) and the magnetic isolation material (7) and the magnet (9) in the sleeve (10) there is a Annular iron sheet (6). 5. The magnetic grinding device according to claim 1, characterized in that the magnet (9) is corrugated.

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