JP2009172739A - Polishing tool and polishing wheel using the same tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing tool capable of softly bringing polishing pieces into contact with a material to be polished with hardly damaging the material to be polished. <P>SOLUTION: A pair of polishing cloth and paper 1 having the many short strip-shaped polishing pieces 2 radially branched with a central mounting hole 1a as a center are overlapped to be mutually shifted in the peripheral direction so that the polishing material surfaces 2a may be mutually faced to the outside and a tip of the polishing piece 2 of one polishing cloth and paper 1 may be located between tips of the polishing pieces 2 adjacent to each other of the other polishing cloth and paper 1. When the polishing tool P is pressed on the material to be polished, each of the polishing pieces 2 is brought into contact with the material to be polished in a recessed and bent state of a base material surface 2b side having lower rigidity than that of the polishing material surface 2a side, contact pressure of the polishing pieces 2 and the material to be polished is suppressed, and the material to be polished is made hard to be damaged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a polishing tool in which polishing cloths having a large number of strip-shaped polishing pieces are overlapped, and a polishing wheel using the same.

Conventionally, as a rotary polishing tool used to remove burrs generated in metal workpieces by punching, drilling, cutting, etc. and finishing the edges of casting grooves, a polishing cloth with a large number of strip-like polishing pieces is stacked. There is known a technique in which a plurality of combined polishing tools are attached to the outer periphery of a rotary shaft via a fixture, and the rotary shaft is rotated to perform polishing with each polishing tool (see, for example, Patent Document 1).
JP-A-8-118228 (FIG. 3)

  The polishing tool of the rotary polishing tool (rotary sanding device) described in Patent Document 1 is a polishing cloth having a number of strip-shaped polishing pieces that diverge radially around a central mounting hole. These are superposed so that the surfaces face each other, and the circumferential positions of the polishing pieces of the pair of abrasive cloth papers are substantially the same.

  In the rotary polishing tool as described above, as shown in FIG. 6, when the polishing tool is pressed against the material A during the polishing operation, the tip portions of the two overlapping polishing pieces 51 are both in the axial direction of the rotary shaft 52. Only the abrasive surface 51a of one polishing piece 51 comes into contact with the material A to be polished. Here, since the abrasive cloth paper is obtained by fixing an abrasive material such as abrasive grains to one surface of a base material such as thin paper or cloth, each polishing piece 51 has a rigidity on the abrasive material surface 51a side of the base material surface 51b. It is easy to bend so that the base material surface 51b side may become concave shape. However, in the case of FIG. 6, since the polishing pieces 51 of the pair of polishing cloths overlap at the same circumferential position, one polishing piece 51 usually bends in a form that is easily bent, and at the same time the other polishing piece. 51 is bent in the opposite direction to the normal state, and the bending of one polishing piece 51 is supported by the rigidity of the polishing piece surface 51a side of the other polishing piece 51. For this reason, the contact pressure between the one polishing piece 51 and the material to be polished A becomes relatively high, and there is a possibility that the material to be polished A may be damaged.

  An object of the present invention is to provide a polishing tool capable of softly contacting a polishing piece with a material to be polished and hardly damaging the material to be polished, and a polishing wheel using the same.

  In order to solve the above-described problems, the polishing tool of the present invention is a polishing cloth having a number of strip-shaped polishing pieces that diverge radially around a central mounting hole, and the abrasive surfaces thereof face each other. In the polishing tool thus stacked, the pair of abrasive cloth papers are circumferentially aligned with each other so that the tip of the abrasive piece of the other abrasive cloth paper is positioned between the tips of the adjacent abrasive pieces of the one abrasive cloth paper. It was set up in a staggered manner.

  That is, since the tip of the polishing piece of the other polishing cloth is positioned between the tips of the adjacent polishing pieces of one polishing cloth, each of the polishing pieces is pressed when the polishing tool is pressed against the material to be polished. The substrate surface side, which is less rigid than the abrasive surface side, has a concave shape and is bent so as to be in contact with the material to be polished, so that the contact pressure between the polishing piece and the material to be polished is suppressed, and the material to be polished is It was hard to hurt.

  In the polishing tool having the above-described configuration, the mounting hole edge of the polishing cloth is usually attached to the outer peripheral portion of the rotating shaft, so that the tip of each polishing piece is directed to the rear side in the rotation direction of the rotating shaft. By inclining, the contact pressure between the polishing piece and the material to be polished can be further reduced, and surface scratches on the material to be polished can be made more difficult to occur. In addition, when there is little risk of surface scratches due to the material of the material to be polished, the polishing piece can be brought into strong contact with the material to be polished by rotating the rotating shaft in the reverse direction to increase the polishing ability.

  Here, if the pair of abrasive cloth papers are integrally formed from one material, the polishing tool can be efficiently produced.

  And the grinding | polishing wheel of this invention is comprised with the grinding | polishing tool of the said structure, and the fixture which attaches this grinding | polishing tool to the outer periphery of a rotating shaft.

  As described above, according to the present invention, all the polishing pieces of the polishing tool come into contact with the material to be polished while being bent with the base surface side concave, so that the polishing pieces are softly applied to the material to be polished. It can touch and finish smoothly without damaging the material to be polished. In addition, since all the polishing pieces come into contact with the material to be polished on the surface of the polishing material, the polishing operation can be performed efficiently.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a rotary polishing tool equipped with the polishing wheel W of the embodiment. In this rotary polishing tool, a polishing wheel W composed of a plurality of polishing tools P and a cylindrical mounting tool 3 is passed through a rotary shaft 4 having a head and a male screw portion on one end side, and a male screw portion of the rotary shaft 4 It is tightened with a nut 5 that is screwed to the nut. In addition, washers 6 and 7 are arranged between the fixture 3 of the grinding wheel W and the head of the rotary shaft 4 and between the fixture 3 and the nut 5.

  The polishing wheel W is provided with a plurality of polishing tools P made of a pair of polishing cloths 1 superposed on each other along the axial direction of the fixture 3. The fixture 3 is composed of a plurality of ring members 8 arranged in the axial direction, and the edge of the attachment hole 1a formed at the center of each polishing tool P is sandwiched between the outer peripheral portions of the ring members 8 for bonding. By injecting the agent 9, each ring member 8 and the polishing tool P are integrated.

  As shown in FIG. 2, the polishing tool P has an abrasive cloth paper 1 having a number of strip-shaped polishing pieces 2 that diverge radially around a central mounting hole 1a, and the abrasive surfaces thereof face each other. Are superposed. The pair of polishing cloths 1 are provided so as to be shifted from each other in the circumferential direction so that the tip of the polishing piece 2 of the other polishing cloth 1 is located between the tips of the adjacent polishing pieces 2 of one polishing cloth 1. And is connected at the edge of the mounting hole 1a.

  As shown in FIG. 3, first, the polishing tool P is produced by applying a width from one side edge to the center in the width direction on one rectangular sheet material S as a material of the pair of polishing cloths 1. A slit 10 extending in a direction slightly inclined with respect to the direction is formed. At this time, the positions of the slits 10 are shifted in the longitudinal direction of the sheet material S on both sides of the sheet material S. Then, both side edges of the sheet material S are cut into a corrugated shape in accordance with the tip shape of the polishing piece 2, and both longitudinal ends are cut along the inclination of the slit 10.

  Next, as shown in FIG. 4A, the sheet material S formed in the shape of FIG. 3 is folded in half at the center in the width direction so that the abrasive surface faces outward. At this time, the string-like member 11 longer than the sheet material S is sandwiched between the bent portions of the sheet material S. And as shown in FIG.4 (b), many strip-shaped grinding | polishing pieces 2 are formed by curving in-plane the sheet material S folded in half so that a bending part may become inside. The tip of the abrasive piece 2 with the base material surface 2b facing upward is positioned between the tips of the abrasive piece 2 with the abrasive surface 2a facing upward in the figure while branching radially around the center mounting hole 1a. become. Finally, both ends of the string-like member 11 are joined so as to maintain this shape. In this way, the polishing tool P shown in FIG. 2 is integrally formed. Further, in this polishing tool P, since the slits 10 of the raw sheet material S are inclined with respect to the width direction, each polishing piece 2 extends in a direction slightly inclined with respect to the radial direction of the rotating shaft 4. It becomes.

  Although the polishing tool can be efficiently manufactured by the above method, a pair of polishing cloths may be prepared as separate bodies, or polishing pieces of the polishing cloth paper are separately manufactured and rotated one by one. You may make it attach to the outer peripheral part of an axis | shaft.

  The polishing wheel W has the above-described configuration, and the tip of the polishing piece 2 of the other polishing cloth 1 is positioned between the tips of the adjacent polishing pieces 2 of one polishing cloth 1 of each polishing tool P. Therefore, as shown in FIG. 5, when the polishing tool P is pressed against the material A to be polished and the polishing operation is performed, the tip surface of each polishing piece 2 has a lower base material surface than the polishing material surface 2a side. In contact with the material A to be polished in a state of being bent with the 2b side concave, the contact pressure between the polishing piece 2 and the material A to be polished is lower than in the prior art (see FIG. 6).

  Also, each polishing piece 2 is arranged slightly inclined with respect to the radial direction of the rotating shaft 4, and the rotating shaft 4 is rotated so that the tip side thereof faces the rear side in the rotating direction of the rotating shaft 4. The contact pressure between the polishing piece 2 and the material to be polished A is reduced.

  Therefore, the polishing piece 2 can be brought into soft contact with the workpiece A and finished smoothly without damaging the workpiece A.

  On the other hand, when there is little possibility of surface scratches due to the material of the material A to be polished, the polishing piece 2 can be brought into strong contact with the material A to be polished by rotating the rotating shaft 4 in the reverse direction, thereby increasing the polishing ability.

  Further, in this polishing wheel W, a pair of polishing cloths 1 of each polishing tool P are close to each other, and all the polishing pieces 2 come into contact with the material A to be polished on the polishing material surface 2a, so that polishing work can be performed efficiently. There is also an advantage.

  In the above-described embodiment, each polishing piece is inclined with respect to the radial direction of the rotation shaft so that the strength of contact between the polishing piece and the material to be polished can be changed depending on the rotation direction of the rotation shaft. By extending the piece along the radial direction of the rotating shaft, the polishing piece may come into contact with the material to be polished with a constant strength regardless of the rotating direction of the rotating shaft.

  In addition, the number of polishing tools in the polishing wheel is not necessarily plural, and when polishing a narrow groove or the like, a polishing wheel provided with only one polishing tool can be used.

Front sectional view of a rotary polishing tool equipped with the polishing wheel of the embodiment The perspective view of the grinding | polishing tool used for the grinding | polishing wheel of FIG. Plan view of the sheet material used as the material of the polishing cloth shown in FIG. a and b are perspective views of main parts for explaining the procedure for producing the polishing tool of FIG. Sectional drawing of the principal part explaining the use condition of the grinding | polishing wheel of FIG. Sectional drawing of the principal part explaining the use condition of the conventional grinding | polishing wheel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Polishing cloth 1a Mounting hole 2 Polishing piece 2a Abrasive material surface 2b Base material surface 3 Mounting tool 4 Rotating shaft 10 Slit 11 String-shaped member A Polishing material P Polishing tool S Sheet material W Polishing wheel

Claims (4)

  In a polishing tool in which a polishing cloth having a number of strip-shaped polishing pieces that diverge radially around a central mounting hole is overlapped so that the abrasive surfaces face each other, the pair of polishing cloths A polishing tool, wherein the polishing tool is provided so as to be shifted in the circumferential direction so that the tip of the polishing piece of the other polishing cloth is positioned between the tips of adjacent polishing pieces of one polishing cloth.   The mounting hole edge portion of the abrasive cloth paper is attached to the outer peripheral portion of the rotating shaft, and each of the polishing pieces is inclined so that the front end side thereof faces the rear side in the rotation direction of the rotating shaft. Item 2. The polishing tool according to Item 1.   The polishing tool according to claim 1 or 2, wherein the pair of polishing cloths are integrally formed from a single material.   A polishing wheel comprising the polishing tool according to any one of claims 1 to 3 and an attachment for mounting the polishing tool on an outer periphery of a rotating shaft.

Images