JP2008142836A - Brush grinding device and brush grinding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush grinding device which remarkably reduces radial abrasion of a grinding brush at a constraining part by a supporting plate and efficiently carries out grinding work comparatively large in working quantity in high precision for a long period of time. <P>SOLUTION: A workpiece W supported on a table 4 is ground by the grinding brush 2 held on a brush holder 3. The grinding brush 2 is constrained by the constraining part 10 of the supporting plate 6 between the table 4 and the brush holder 3. A first nozzle 18 to jet grinding liquid toward a contact position of the grinding brush 2 and the workpiece W, and a second nozzle 19 to jet the grinding liquid toward the constraining position of the grinding brush 2 by the constraining part 10 of the supporting plate in carrying out the grinding work by making a fore end part of the grinding brush 2 contact with the workpiece W, are provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brush grinding apparatus and a brush grinding method for grinding a workpiece using a grinding brush formed by bundling a plurality of brush-containing wires containing abrasive grains.

  2. Description of the Related Art Conventionally, there is known a technique in which a workpiece surface is polished or wiped by a tip of a brush attached to a brush holder that is driven to rotate (see, for example, Patent Document 1). In this structure, a support plate that is rotated integrally with the brush holder is provided below the brush holder, and the brush is inserted through an insertion hole formed in the support plate, thereby restraining the intermediate portion of the brush. As a result, the vibration of the tip of the brush is suppressed during the polishing operation, and the contact of the tip of the brush with the workpiece can be maintained with high accuracy. In addition, the support plate is arranged so that the position of the support plate can be adjusted in the vertical direction relative to the brush holder, so that even if the brush wears, the protruding amount of the brush tip from the support plate Can be adjusted easily.

However, in this type of apparatus, the support plate is formed when the brush is formed by bundling a plurality of abrasive-containing brush strands and grinding is performed using a grinding brush having a larger processing amount than polishing. The grinding brush in the portion constrained by this has a significant radial wear, and there is a disadvantage that the grinding efficiency and the grinding accuracy are lowered. In other words, the grinding process is different from the polishing process in which only the brush is used to round the corners of the workpiece, and the abrasive grains of the brush are used to finish the workpiece into a high-precision part having a predetermined size, shape, and finish surface. With this, the surface of the workpiece is scraped and smoothed. When grinding is performed with a larger processing amount than such polishing, the grinding brush abuts relatively strongly against the workpiece, so that it vibrates greatly from the tip of the grinding brush to the restraint portion of the support plate. Due to this vibration, especially in the restraint portion of the support plate where the degree of adhesion between the brush strands is large, the abrasive grains detached from the brush strands stay between the brush strands and come in contact with each other, and the brush strands are polished together. By fitting, the diameter of each brush element wire is reduced. As a result, not only the outer diameter of the grinding brush is reduced, but also the restraint by the support plate is insufficient, the waist of the grinding brush is weakened, and the desired processing accuracy cannot be obtained.
JP-A-8-317608

  By eliminating such inconvenience, the present invention can dramatically reduce the wear of the grinding brush in the radial direction at the constrained portion by the support plate, and perform grinding processing with a relatively large amount of processing efficiently with high accuracy over a long period of time. An object of the present invention is to provide a brush grinding apparatus and a brush grinding method.

  In order to achieve such an object, the present invention is formed by bundling a table that supports a workpiece, a brush holder that is provided opposite to the table and rotates, and a plurality of brush elements containing abrasive grains. A grinding brush that has a root portion held by the holder and whose bristle direction extends toward the workpiece, is positioned between the table and the brush holder, is rotated integrally with the brush holder, and the brush holder A support plate disposed so as to be relatively position-adjustable in the contact / separation direction, and a restraint portion that is provided on the support plate and restrains an intermediate portion of the grinding brush held by the brush holder, In a brush grinding apparatus that performs grinding by bringing the tip of the grinding brush into contact with the workpiece by the rotation of the brush holder, the grinding liquid is sprayed toward the contact position between the grinding brush and the workpiece. That a first nozzle, characterized in that a second nozzle for injecting grinding fluid toward the restrained position of the grinding brush by restraining portion of the support plate.

  According to the brush grinding apparatus of the present invention, when a relatively large amount of grinding is performed, even if a relatively large amount of grinding scraps generated from the workpiece and abrasive particles detached from the grinding brush are generated at the grinding point, Since the grinding debris and detached abrasive grains at the grinding point are smoothly removed by the grinding liquid sprayed from the first nozzle, highly accurate grinding can be performed efficiently.

  Furthermore, in this invention, the said 2nd nozzle is provided and a grinding fluid is injected toward the restraint position of the grinding brush by the restraint part of a support plate. According to this, it is possible to smoothly remove the abrasive grains detached from each brush element that is in close contact with the restraint portion from between each brush element by the grinding liquid sprayed from the second nozzle, At this time, the lubrication action of the grinding liquid that has entered between the brush elements can suppress the polishing of the brush elements and can dramatically reduce the diameter of the individual brush elements. As a result, the grinding brush is maintained in a sufficiently restrained state by the restraining portion of the support plate, and the tip of the grinding brush extending from the restraining portion is maintained in a strong state, so that the processing amount is relatively large. Grinding can be efficiently performed with high accuracy over a long period of time.

  In addition, the present invention is formed by bundling a table for supporting a workpiece, a brush holder provided opposite to the table and rotating, and a plurality of brush elements containing abrasive grains, and a root portion is held by the brush holder. And the grinding brush extending toward the workpiece, the bristle direction is positioned between the table and the brush holder, is rotated integrally with the brush holder, and is relative to the brush holder in the contact / separation direction. Using a brush grinding apparatus comprising: a support plate arranged so as to be positionally adjustable; and a restraining portion that is provided on the support plate and restrains an intermediate portion of the grinding brush held by the brush holder, In a brush grinding method in which the tip of the grinding brush is brought into contact with the workpiece by rotation of the brush holder and grinding is performed, and the grinding liquid is supplied toward the contact position between the grinding brush and the workpiece. , And supplying the grinding fluid to the restraining position of the grinding brush by restraining portion of the support plate.

  According to the brush grinding method of the present invention, even if abrasive particles detached from the workpiece grinding scraps or the grinding brush are generated at the grinding point at the time of grinding, the supplied grinding fluid is poured to grind scraps or detached abrasive grains. Can be reliably removed, so that highly accurate grinding can be efficiently performed. As a result, the grinding brush is maintained in a sufficiently restrained state by the restraining portion of the support plate, and the tip of the grinding brush extending from the restraining portion is maintained in a strong state, so that the processing amount is relatively large. Grinding can be efficiently performed with high accuracy over a long period of time.

  An embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory perspective view schematically showing a brush grinding apparatus of the present embodiment, FIG. 2 is an explanatory sectional view showing a brush holder, FIG. 3 is an explanatory plan view showing a part of a table, and FIG. FIG. 5 is an explanatory side view showing the grinding brush after grinding, and FIG. 5 is an explanatory view showing the operation of the first and second nozzles.

  As shown in FIG. 1, the brush grinding apparatus 1 in the present embodiment includes a disc-shaped brush holder 3 in which a plurality of grinding brushes 2 are provided on the circumference, and a plurality (six in this embodiment) of metal rings. And a table 4 for holding W. The metal ring W is formed in a thin plate-like endless belt shape and is used for an endless belt of a continuously variable transmission. The grinding brush 2 is formed by bundling a plurality of brush strands made of nylon wire containing abrasive grains and bundling the base with a cap-shaped binding tool 5 (see FIG. 5).

  As shown in FIG. 2, the brush holder 3 supports the root portion of the grinding brush 2 via the binding tool 5 of the grinding brush 2. A disk-shaped support plate 6 is provided below the brush holder 3. The support plate 6 includes an insertion hole 7 through which the grinding brush 2 is inserted, and a bush 9 in which a tapered hole 8 is formed is inserted into the insertion hole 7. The tapered hole 8 of the bush 9 is formed in a shape that gradually decreases in diameter downward. In a state where the grinding brush 2 is attached to the brush holder 3, the grinding brush 2 is inserted into the insertion hole 7 through the bush 9 from the tip side. At this time, the intermediate portion near the tip of the grinding brush 2 is restrained by the bush 9 of the insertion hole 7, and this position becomes the restraining portion 10 of the grinding brush 2.

  The support plate 6 is provided with a connecting rod 11 that extends upward. The connecting rod 11 penetrates in a vertical direction through a sliding hole 12 formed in the brush holder 3, and is connected to a cylindrical rotating shaft 13 disposed above the brush holder 3 via a flange 14. It is connected. The rotary shaft 13 is rotationally driven by a drive motor (not shown). The rotation of the rotary shaft 13 is transmitted to the brush holder 3 and the support plate 6 by the connecting rod 11 and is driven to rotate together.

  The brush holder 3 is connected to a substantially cylindrical lifting shaft 15 slidably inserted into a cylindrical rotating shaft 13. The brush holder 3 moves up and down as the elevating shaft 15 is slid in the axial direction by elevating means (not shown). As the brush holder 3 moves up and down, the position of the support plate 6 can be adjusted in the vertical direction relative to the brush holder 3.

  The table 4 includes a plurality (six in this embodiment) of ring holding means 16 that hold the metal ring W from the inside. As shown in FIG. 3, the ring holding means 16 is formed by a plurality of (six in this embodiment) contact members 17, and a metal ring W around the contact members 17 in a state where the contact members 17 are close to each other. The contact members 17 are separated from each other, and are held in contact with the metal ring W from the inner peripheral surface. Each ring holding means 16 is rotated by a motor (not shown) to rotate each metal ring W in the circumferential direction.

  As shown in FIGS. 1 and 3, the table 4 is provided with a plurality of first nozzles 18 and a plurality of second nozzles 19 (six in this embodiment). Both the first nozzle 18 and the second nozzle 19 are for injecting a grinding fluid. Although not shown, the grinding fluid stored in a tank is pumped by a pump and the first nozzle 18 and the second nozzle 19 through a tube or the like. The two nozzles 19 are forcibly supplied. As will be described in detail later, as shown in FIG. 4, the first nozzle 18 is provided substantially horizontally so as to inject the grinding liquid toward the contact portion between the metal ring W and the tip of the grinding brush 2. The second nozzle 19 is provided so as to be inclined obliquely upward so as to inject the grinding liquid toward the restraining portion 10 of the grinding brush 2 by the bush 9 of the support plate 6.

  When the side edge of the metal ring W is ground by the brush grinding apparatus 1, each metal ring W mounted on each ring holding means 16 is rotated in the circumferential direction, the brush holder 3 is rotated, and the grinding brush 2 is metalized. It abuts on the upper edge of the ring W. Thereby, the upper end edge of the metal ring W is ground by the grinding brush 2, and the upper end edge of the metal ring W is processed into a smooth substantially arc shape.

  Then, when the upper edge of the metal ring W is ground by the grinding brush 2, the grinding liquid is jetted from the first nozzle 18 and the second nozzle 19 as shown in FIG. 4. The grinding liquid sprayed from the first nozzle 18 is applied to the grinding point of the metal ring W and the grinding brush 2 that contacts the metal ring W. Thereby, grinding scraps of the metal ring W, wear scraps of the grinding brush 2, abrasive grains detached from the grinding brush 2, and the like are removed by a jet of the grinding fluid. At the same time, the grinding fluid sprayed from the second nozzle 19 removes the abrasive grains separated from the brush wires that are in close contact with each other at the restraining portion 10 from between the brush strands, and lubricates between the brush strands. Is granted.

  Here, the abrasion state of the grinding brush 2 when grinding is performed without spraying the grinding liquid from the second nozzle 19, and the grinding brush when grinding is performed by spraying the grinding liquid from the second nozzle 19 As shown in FIG. 5 (a), when the grinding is performed without spraying the grinding liquid from the second nozzle 19, the support plate is polished by mutual brush element wires. Although a reduction (reduction in diameter) of the outer diameter dimension a from 6 to the tip of the grinding brush 2 was seen, when grinding is performed by injecting a grinding liquid from the second nozzle 19, it is shown in FIG. Thus, it has become clear that the original outer diameter dimension a of the grinding brush 2 is maintained over its entire length.

  As described above, according to the present embodiment, the grinding brush is ejected from the second nozzle 19 to suppress the diameter reduction of the grinding brush 2, whereby the grinding brush by the restraining portion 10 (bush 9) of the support plate 6. 2 is maintained, and the tip of the grinding brush 2 extending below the support plate 6 is maintained in a strong state, so that the processing amount of grinding the edge of the metal ring W is relatively large. Processing can be performed efficiently with high accuracy over a long period of time.

  In the present embodiment, the example in which the first nozzle 18 and the second nozzle 19 are provided on the table 4 has been described. However, the present invention is not limited to this, and the first nozzle 18 includes the metal ring W and the grinding brush. The second nozzle 19 may be provided at a position where the grinding liquid can be sprayed toward the contact portion with the tip end portion of the 2 and the second nozzle 19 faces the position where the grinding brush 2 is restrained by the restraining portion 10. Thus, an appropriate inclination angle may be set at a position where the grinding liquid can be ejected.

  In addition to that, although not shown in detail, referring to FIG. 2, the brush holder 3 is provided with a flow path through which the grinding liquid flows, and the bundling tool 5 is also provided with a communication path through which the grinding liquid flows. The grinding fluid may be poured from above to the restraint 10.

  Furthermore, although not shown in the drawing, a flow path through which the grinding fluid flows is provided in the support plate 6 so as to be able to be injected into the insertion hole 7, and more specifically, a communication passage through which the grinding fluid flows is also provided in the bush 9. The grinding liquid may be sprayed from the side of the head toward the restraining portion 10. At this time, by forming the communication path of the bush 9 through which the grinding fluid flows in a spiral shape toward the center, the grinding fluid can easily enter between the strands of the grinding brush 2, and the lubricating action can be further improved. it can.

An explanatory perspective view showing typically a brush grinding device of one embodiment of the present invention. Explanatory sectional drawing which shows a brush holder. An explanatory plan view showing a part of a table. Explanatory drawing which shows the action | operation of the 1st and 2nd nozzle. An explanatory side view showing a grinding brush after grinding.

Explanation of symbols

  W ... Metal ring (workpiece), 1 ... Brush grinding device, 2 ... Grinding brush, 3 ... Brush holder, 4 ... Table, 6 ... Support plate, 10 ... Restraint section, 18 ... First nozzle, 19 ... Second nozzle.

Claims (2)

A table for supporting a workpiece, a brush holder provided opposite to the table and rotating, and a plurality of brush-wires containing abrasive grains are bundled together. A grinding brush extending toward the workpiece, and positioned between the table and the brush holder, rotated integrally with the brush holder, and relatively adjustable in the contact / separation direction with respect to the brush holder A support plate disposed so as to be, and a restraining portion that is provided on the support plate and restrains an intermediate portion of the grinding brush held by the brush holder, and the tip of the grinding brush is rotated by the rotation of the brush holder In the brush grinding device that abuts the workpiece and grinds it,
A first nozzle for injecting a grinding fluid toward a contact position between the grinding brush and the workpiece;
A brush grinding apparatus, comprising: a second nozzle that ejects a grinding liquid toward a restraining position of the grinding brush by the restraining portion of the support plate. A table for supporting a workpiece, a brush holder provided opposite to the table and rotating, and a plurality of brush-wires containing abrasive grains are bundled together. A grinding brush extending toward the workpiece, and positioned between the table and the brush holder, rotated integrally with the brush holder, and relatively adjustable in the contact / separation direction with respect to the brush holder A brush grinding device comprising: a support plate arranged to be; and a restraining portion that is provided on the support plate and restrains an intermediate portion of the grinding brush held by the brush holder. In the brush grinding method in which the tip of the grinding brush is brought into contact with the workpiece to perform grinding,
Supply grinding fluid toward the contact position between the grinding brush and the workpiece,
A brush grinding method, wherein a grinding fluid is supplied to a restraining position of a grinding brush by a restraining portion of the support plate.

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