JP2007222993A - Reinforcing plate for rotation grinding tool, and rotation grinding tool equipped with reinforcing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing plate which sufficiently suppresses deflection of a grinding member at the time of grinding, and is easily removed from a rotation grinding tool when the grinding member is worn out. <P>SOLUTION: In the reinforcing plate of the rotation grinding tool, a first surface 11 to a fifth surface 15 concentrically exist on a lower surface. The first surface 11, a third surface 13, and the fifth surface 15 are parallel with each other in a vertical direction. The third surface 13 exists above the first surface 11, and the fifth surface 15 exists above the third surface 13. A second surface 12 is a surface coupling an inner peripheral edge of the first surface 11 and an outer peripheral edge of the third surface 13 to each other, and a fourth surface 14 is a surface coupling an inner peripheral edge of the third surface 13 and an outer peripheral edge of the fifth surface 15 to each other. In the center of the fifth surface 15, a rotation shaft penetrating hole 16 in which a rotation shaft 41 of a rotation driving machine 4 such as a grinder is inserted is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reinforcing plate for a rotary polishing tool used by being attached to a rotary driving machine such as a grinder, and a rotary polishing tool provided with the same.

JP-A-11-99460 Japanese Patent Laid-Open No. 10-34545

  Conventionally, a rotary polishing tool used by being attached to a rotary drive machine such as a grinder is well known. This is composed of a substantially disk-shaped substrate that can be fixed to the rotating shaft of a rotary drive machine, and a polishing member that is a plate-like body attached to the lower surface of the substrate.

  The polishing member is formed by collecting a plurality of flexible polishing sheets such as sandpaper. Each of the polishing sheets has a substantially rectangular shape or the like, and is adhered to the surface near the outer edge of the substantially disk-shaped substrate by sequentially shifting in the circumferential direction.

  Here, since the polishing member is an assembly of flexible polishing sheets as described above, the polishing member is deformed by pressing. Accordingly, when the polishing operation is performed with the rotary polishing tool attached to the rotary drive machine, the polishing member tends to bend.

  Since the bending of the polishing member as described above may hinder a stable polishing operation, the substrate has an effect of imparting rigidity to the polishing member and suppressing the bending.

  However, the abrasive member wears with use. Specifically, the outer peripheral edge with the fastest peripheral speed wears out the fastest. Therefore, when the substrate is provided just above the outer peripheral edge of the polishing member, this portion of the polishing member disappears due to wear and the substrate is exposed. In this case, the rotary abrasive can no longer exhibit a normal polishing action and must be discarded.

  Based on the above, it is conceivable that the substrate has a smaller diameter than the diameter of the polishing member (aggregate of polishing sheets) in anticipation of the wear of the polishing member. However, if this is done, it becomes impossible to suppress the bending of the polishing member during polishing in a portion where the substrate does not exist.

  Here, Patent Literature 1 relating to the invention by the present inventor discloses a rotary polishing tool provided with a ring-shaped member (referred to as “second holding member” or “outer peripheral portion” in Patent Literature 1). Has been. This ring-shaped member has an effect that the contact area with respect to the polishing member such as the substrate can be expanded by connecting the substrate or the member corresponding thereto in the radially outward direction.

  However, the invention described in Patent Document 1 makes it possible to recycle by removing only the ring-shaped member without discarding the entire rotary polishing tool when the polishing member is worn, thereby reducing the amount of waste. Since it is the main purpose, the ring-shaped member is not directly fixed to the rotary shaft of the rotary drive machine. Therefore, force is not sufficiently transmitted between the substrate and the ring-shaped member. Therefore, when using a rotary polishing tool actually provided with a ring-shaped member, the ring-shaped member may be warped from the boundary between the substrate and the ring-shaped member due to the pressing force during polishing, as described above. The effect of preventing the polishing member from being bent was not perfect.

  In view of the above, the present invention can sufficiently suppress the bending of the polishing member during polishing, which is a problem peculiar to the case of using a polishing member made of an assembly of flexible polishing sheets. Therefore, it is an object to provide a reinforcing plate that can be easily removed when the polishing member is worn. And it makes it a subject to provide the rotary abrasive | polishing tool provided with the reinforcement board which can be used over a longer term.

  Note that the polishing member used by attaching the “disk holder” according to the invention described in Patent Document 2 is not formed by bonding the aggregate of polishing sheets to the substrate as described above, and the entire lower surface is the polishing surface. The present invention uses a single abrasive sheet, and the present invention is completely different from the present invention in the problem to be solved. In addition, this “disk holder” corresponds to the above substrate, and Patent Document 2 does not describe the bending of the polishing member in the portion where the substrate does not exist. That is, there is no suggestion in Patent Document 2 regarding a problem peculiar to the case where an abrasive member made of an assembly of flexible abrasive sheets is used.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is a substantially disk-shaped body, and the lower surface thereof has concentric first surfaces 11 to 5 in order from the outer peripheral edge toward the center. The first surface 11, the third surface 13, and the fifth surface 15 are parallel to each other in the vertical direction, and the third surface 13 is more than the first surface 11. Is located above, and the fifth surface 15 is present above the third surface 13, and the second surface 12 includes the inner periphery of the first surface 11 and the outer periphery of the third surface 13. The fourth surface 14 connects the inner peripheral edge of the third surface 13 and the outer peripheral edge of the fifth surface 15, and is a surface that sequentially goes upward as it goes to the center. In other words, at least the first surface 11 and the fifth surface 15 are flat surfaces. Can be passed through the rotary shaft 41 of the rotary drive unit 4 over such, characterized in that the rotating shaft through hole 16 provided to provide a reinforcing plate of the rotary grinding tool.

  The invention according to claim 2 of the present application is characterized in that the outer diameter of the first surface 11 is 87 to 97 mm, and the outer diameter of the third surface 13 is 71 to 81 mm. The reinforcing plate of the rotary polishing tool according to claim 1 is provided.

  Further, the invention described in claim 3 of the present application includes a substantially disc-shaped substrate 21 that can be fixed to the rotation shaft 41 of the rotary drive machine 4 such as a grinder, and a polishing member 22 provided below the substrate 21. The reinforcing plate 1 according to claim 1 or 2 is attached to a rotary polishing tool 2 made of the above, and the polishing member 22 includes a plurality of polishing sheets 22 a on the lower surface of the substrate 21. Of these, the polishing member 22 is fixed at least in a region near the outer edge in the circumferential direction, and the outer diameter of the polishing member 22 is larger than the outer diameter of the substrate 21. A rotating shaft mounting hole 23 through which a shaft 41 can pass is provided, and the reinforcing plate 1 has the first surface 11 in contact with the polishing member 22, and the third surface 13 and the fourth surface. 14 and the fifth surface 15, the above The vertical distance with respect to one surface 11 is larger than the vertical distance between the upper surface of the polishing member 22 and the upper surface of the substrate 21 at the radial position corresponding to the reinforcing plate 1 of the rotary polishing tool 2. The outer diameter of the third surface 13 is larger than the diameter of the substrate 21, and the substrate 21 is formed on each of the third surface 13, the fourth surface 14, and the fifth surface 15 of the reinforcing plate 1. The first surface 11 is in contact with the polishing member 22 with respect to the portion 22c of the upper surface of the polishing member 22 where no substrate is present. The fifth surface 15 is provided with a reinforcing plate, which is in contact with the upper surface of the substrate 21 when the rotary polishing tool 2 and the reinforcing plate 1 are both fixed to the rotating shaft 41 of the rotary driving machine 4. A rotating polishing tool is provided.

  In addition, the invention according to claim 4 of the present application includes a substantially disc-shaped substrate 21 that can be fixed to the rotation shaft 41 of the rotary drive machine 4 such as a grinder, and a polishing member 22 provided below the substrate 21. The reinforcing plate 1 is attached to the rotary polishing tool 2 made of the above, and the polishing member 22 has a plurality of polishing sheets 22a in the circumferential direction at least in the region near the outer edge of the lower surface of the substrate 21. The outer diameter of the polishing member 22 is larger than the outer diameter of the substrate 21, and the rotating shaft is attached to the substrate 21 so that the rotating shaft 41 can pass therethrough. A hole 23 is provided, and a portion of the upper surface of the polishing member 22 bonded to the substrate 21 is a substrate contact portion 22b, and a portion of the substrate 21 protruding in the radially outward direction is not in contact with the substrate. Part 22c, the above-mentioned complement. The plate 1 is substantially disc-shaped and has a diameter that is equal to or smaller than the diameter of the polishing member 22 and that exceeds the diameter of the substrate 21. The substrate coating portions 12 to 15 having the rotation shaft through-hole 16 through which the rotation shaft 41 can be passed together with the shaft mounting hole 23 are disposed on the outer side of the substrate coating portions 12 to 15 on the outer side of the polishing member. Each of the contact portions 11 is formed, and can be coordinated from the upper side of the rotary polishing tool 2 so as to cover at least a part of the substrate 21 and the substrate non-contact portion 22c. The polishing member abutting part 11 abuts on the substrate non-abutting part 22c, and a rotating abrasive tool provided with a reinforcing plate is provided.

  In the invention according to claim 5 of the present application, the substrate abutting surface 15 is provided near the center of the substrate covering portions 12 to 15 on the lower surface of the reinforcing plate 1. The at least part of the reinforcing plate (1) is in contact with the substrate (21) when the reinforcing plate (1) is fixed to the rotary shaft (41) of the rotary drive device (4) while being attached to the rotary polishing tool (2). A rotary polishing tool having a reinforcing plate is provided.

  Since the reinforcing plate according to the first and second aspects of the present invention is composed of a substantially disk-like body that is a single piece, there is no boundary between which rigidity is divided as in the prior art, and rotation. Even when attached to the polishing tool 2, the polishing member 22 can be reliably supported, and in the state where the reinforcing plate 1 is attached to the rotating polishing tool 2, reliable polishing without blurring is possible. Therefore, it is possible to sufficiently suppress the bending of the polishing member 22 during polishing, which is a problem peculiar to the case of using a polishing member made of an assembly of flexible polishing sheets. Thus, it is possible to provide a reinforcing plate that can be easily removed when the wear is worn.

In the invention according to claim 3 of the present application, the first surface 11 is in contact with the polishing member 22, and any of the third surface 13, the fourth surface 14, and the fifth surface 15 is the first surface. The vertical distance with respect to the surface 11 is larger than the vertical distance between the upper surface of the polishing member 22 and the upper surface of the substrate 21 at the radial position corresponding to the reinforcing plate 1 of the rotary polishing tool 2. Since the outer diameter of the third surface 13 is larger than the diameter of the substrate 21, the reinforcing plate 1 can be attached to the rotary polishing tool 2 without interference. The first surface 11 is in contact with the portion 22c of the upper surface of the polishing member 22 where the substrate does not exist, and the rotary polishing tool 2 and the reinforcing plate 1 both of the fifth surface 15 When fixed to the rotating shaft 41, the upper surface of the substrate 21 is in contact with the upper surface of the substrate 21. Therefore, at this time, the bending that occurs in at least one of the fifth surface 15 and the substrate 21 is directed radially outward. Then, a downward pressing force is generated on the first surface 11. Therefore, since the substrate non-contact portion 22c of the polishing member 22 is pressed by this pressing force, the polishing member 22 can be strongly supported by the reinforcing plate 1 and the polishing member 2 can be provided with high rigidity. Thus, more reliable polishing is possible.
In addition, the user of the rotary polishing tool 2 can select use / non-use of the reinforcing plate 1, whereby the polishing member 22 is strongly pressed against the object to be polished and softened to the object to be polished. It was possible to provide different rotary polishing tools that were very easy to use because they could be used properly depending on the situation.

In the invention according to claim 4 of the present application, the reinforcing plate 1 is substantially disc-shaped and has a diameter that is equal to or smaller than the diameter of the polishing member 22 and exceeds the diameter of the substrate 21. And can be arranged from above the rotary polishing tool 2 so as to cover at least a part of the substrate 21 and the substrate non-contact portion 22c. A polishing member abutting portion 11 is formed on the outer edge portion of the lower surface of the reinforcing plate 1, and the polishing member abutting portion 11 can abut on the substrate non-abutting portion 22c. Further, the reinforcing plate 1 is composed of a single piece. As a result, there is no boundary between which the rigidity is divided as in the prior art, and the reinforcing plate 1 can reliably support the polishing member 22, and reliable polishing without blurring is possible. Therefore, the bending of the polishing member 22 at the time of polishing can be sufficiently suppressed. When the polishing member 22 is worn, the reinforcing plate 1 can be easily removed, and the polishing operation can be performed for a longer time than before. It was possible to provide a rotary polishing tool that can be continued.
In addition, the user of the rotary polishing tool 2 can select use / non-use of the reinforcing plate 1, whereby the polishing member 22 is strongly pressed against the object to be polished and softened to the object to be polished. It was possible to provide different rotary polishing tools that were very easy to use because they could be used properly depending on the situation.

  In addition to the effect of the invention according to claim 4, the invention according to claim 5 of the present application has the substrate abutting surface 15 in a state in which the reinforcing plate 1 is attached to the rotary polishing tool 2. 4 is fixed to the rotating shaft 41, and at least a part of the rotating shaft 41 comes into contact with the substrate 21. Therefore, at this time, the bending generated in at least one of the fifth surface 15 and the substrate 21 is transmitted in the radially outward direction. Then, a downward pressing force is generated on the first surface 11. Therefore, since the substrate non-contact portion 22c of the polishing member 22 is pressed by this pressing force, the polishing member 22 can be strongly supported by the reinforcing plate 1 and the polishing member 2 can be provided with high rigidity. Thus, more reliable polishing is possible.

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are views showing the form of the reinforcing plate of this example, FIG. 3 is a view showing a combination point of the rotary polishing tool and the reinforcing plate, and FIG. 4 is a rotary polishing tool of this example. It is a figure which shows the mode at the time of attaching to a rotary drive machine combining a reinforcing plate.
In the claims of the present invention and the upper and lower expressions in the following description, the upper side in FIG. 3 is the upper side, and the reverse is the lower side (FIG. 4 is for explanation). Are shown upside down).

  The basic configuration of the rotary polishing tool 2 in this example is the same as that conventionally used. That is, as shown in FIGS. 3 and 4, a substantially disk-shaped substrate 21 that can be fixed to the rotation shaft 41 of the rotary drive machine 4 such as a grinder, and a polishing member 22 that is integrally provided below the substrate 21. It consists of. The reinforcing plate 1 having a detachable structure is attached to the polishing member 22.

  The polishing member 22 is formed by collecting a plurality of polishing sheets 22a in the same manner as conventionally used. This aggregation is achieved by bonding the individual polishing sheets 22a to the sheet bonding surface 21a, which is a region near the outer edge of the lower surface of the substrate 21, while being sequentially shifted in the circumferential direction.

  Here, as each polishing sheet 22a, a sheet-like piece having a substantially rectangular shape or a substantially trapezoidal shape is used. The polishing sheet 22a can be exemplified mainly by sandpaper or the like, in which abrasive grains are coordinated on the surface of paper or cloth. However, as long as the material is flexible, other forms such as a net-like material can be used. A sheet-like body may be used. The individual polishing sheets 22a are arranged so as to lean against other adjacent polishing sheets 22a, that is, in an inclined state with respect to the sheet bonding surface 21a of the substrate 21, and are bonded by an adhesive. Has been.

  In the central region of the lower surface of the substrate 21, as shown in FIG. 4, the rotation shaft 41 of the rotary drive machine 4 penetrates, and the fixing screw 3 is screwed into the rotation shaft 41, so that it interferes with these. The polishing member 22 is not provided so as not to occur. That is, the polishing member 22 is arranged in a donut shape on the lower surface of the substrate 21.

  The substrate 21 is made of a material having higher rigidity than the polishing member 22 such as hard synthetic resin, FRP, metal, cardboard, or the like. The sheet bonding surface 21a is planar because the polishing sheet 22a is bonded thereto. As shown in FIGS. 3 and 4, a rotation shaft attachment hole 23 through which the rotation shaft 41 of the rotation driving machine 4 can be penetrated is provided at the center of the substrate 21 in order to fix the rotation polishing tool. ing. In this example, the through hole has a diameter of 15 mm. However, the shape of the rotating shaft mounting hole 23 can be variously changed according to the shaft diameter of the rotating shaft 41. As shown in FIG. 4, a partition wall 21 b is raised on the lower surface of the substrate 21 in the circumferential direction so as to surround the rotating shaft mounting hole 23. The polishing member 22 is bonded to a region on the lower surface of the substrate 21 in a radially outward direction from the partition wall 21b. Then, as shown in FIG. 3, the polishing member 22 projects from the substrate 21 in the radially outward direction. That is, the diameter of the polishing member 22 is larger than the diameter of the substrate 21.

  Here, a portion of the upper surface of the polishing member 22 that is bonded to the sheet bonding surface 21a of the substrate 21 is a substrate contact portion 22b, and a portion that protrudes from the substrate 21 in the radially outward direction is a substrate non-contact portion 22c. . In the present invention, the difference in diameter between the substrate 21 and the polishing member 22 is made larger than that of the conventional rotary polishing tool. That is, the area of the substrate non-contact portion 22c occupying the area of the upper surface of the polishing member 22 is larger than the conventional area. A first surface (abrasive member abutting portion) 11 of the reinforcing plate 1 described later abuts on the substrate non-abutting portion 22c.

  On the other hand, the reinforcing plate 1 can be placed on the upper side of the rotary polishing tool 2 and is a single, substantially disk-shaped body having a rotation shaft through hole 16 at the center. The reinforcing plate 1 has a diameter that is equal to or smaller than the diameter of the polishing member 22 and exceeds the diameter of the substrate 21. From the upper side of the rotary polishing tool 2, the substrate 21 is not in contact with the substrate. Coordination is possible so as to cover at least part of the portion 22c.

  As shown in FIG. 1C and FIG. 2, the first surface 11 to the fifth surface 15 exist concentrically from the outer peripheral edge toward the center on the lower surface of the reinforcing plate 1 of this example. Among these, the first surface 11, the third surface 13, and the fifth surface 15 are parallel to each other in the vertical direction, and the third surface 13 exists above the first surface 11, and the third surface 13 Further, the fifth surface 15 exists further upward. That is, the surface located closer to the center in the radial direction is provided above. Further, the rotation shaft through hole 16 is provided at the center of the fifth surface 15. In the reinforcing plate 1 of the present example, a metal protective plate 17 is attached around the rotating shaft through hole 16, and the periphery of the rotating shaft through hole 16 is maintained even if the reinforcing plate 1 is repeatedly used. Is hard to wear.

  Here, the first surface 11 is a polishing member abutting portion that abuts on the upper surface of the polishing member 22, specifically, the substrate non-abutting portion 22 c when the reinforcing plate 1 is attached to the rotary polishing tool 2. Function as. The first surface 11 may already be in contact with the substrate non-contact portion 22c in a state where the reinforcing plate 1 and the rotating polishing tool 2 are overlapped, or the first surface 11 may be rotated and polished. In a state where the tool 2 is simply overlapped, there is a gap between the substrate non-contact portion 22 c and at least one of the reinforcing plate 1 and the rotating polishing tool 2 as the fixing screw 3 is tightened. By bending one side, this gap may be eliminated and the substrate non-contact portion 22c may be contacted.

  The fifth surface 15 is at least partially in contact with the upper surface of the substrate 21 when the reinforcing plate 1 is fixed to the rotating shaft 41 of the rotary driving device 4 with the reinforcing plate 1 attached to the rotary polishing tool 2. It functions as a polishing member contact part.

  And the 2nd surface 12 connects the inner periphery of the 1st surface 11, and the outer periphery of the 3rd surface 13, and is made into the surface extended in the front-back direction (vertical direction). That is, a step is formed between the first surface 11 to the third surface 13. Moreover, the 4th surface 14 connects the inner periphery of the 3rd surface 13, and the outer periphery of the 5th surface 15, and is made into the inclined surface which goes to back sequentially as it goes to the center.

  Here, in a state where the reinforcing plate 1 and the rotary polishing tool 2 are not bent, the distance in the vertical direction with respect to the first surface 11 is any of the third surface 13, the fourth surface 14, and the fifth surface 15 described above. The vertical direction between the upper surface (substrate contact portion 22b and substrate non-contact portion 22c) of the polishing member 22 and the upper surface of the substrate 21 at the radial position corresponding to the reinforcing plate 1 of the rotary polishing tool 2 is shown. It is larger than the distance. The outer diameter of the third surface 13 is larger than the diameter of the substrate 21. That is, the horizontal distance from the center of the reinforcing plate 1 to the second surface 12 is formed larger than the outer edge radius of the substrate 21. As a result, a gap is maintained between the substrate 21 and the reinforcing plate 1 except for the first surface 11, and the reinforcing plate 1 can be attached to the rotary polishing tool 2 without interference (FIG. 5A). B)). Thus, the 2nd surface 12 thru / or the 5th surface 15 function as a substrate covering part.

  In the case of this example, the vertical sizes of the gaps between the third surface 13, the fourth surface 14, and the fifth surface 15 with the substrate 21 are substantially equal (see FIGS. 5A and 5B). Of the third surface 13, the fourth surface 14, and the fifth surface 15, the gap on one of the surfaces may be relatively small, and the gap on the other surface may be relatively large. Of course, the gaps between the surfaces 13 to 15 may not be uniform and may be large or small. Alternatively, the entire surface of the third surface 13, the fourth surface 14, and the fifth surface 15 may be 0 with the gap between the substrate 21 and the entire surface being in contact with each other.

  That is, when the reinforcing plate 1 and the rotary polishing tool 2 are overlapped and fixed to the rotary shaft 41, the first surface 11 of the reinforcing plate 1 and the substrate non-contact portion 22c of the rotary polishing tool 2 come into contact with each other. As a condition, it is possible to freely set the minimum value of the gap between the reinforcing plate 1 and the rotary polishing tool 2 in a state where there is no deflection. Therefore, in at least a part of the third surface 13, the fourth surface 14, and the fifth surface 15, the distance in the vertical direction with respect to the first surface 11 is the radial direction corresponding to the reinforcing plate 1 of the rotary polishing tool 2. It may be equal to or smaller than the vertical distance between the upper surface of the polishing member 22 (the substrate contact portion 22b and the substrate non-contact portion 22c) and the upper surface of the substrate 21 at the position.

  In addition, a gap exists between the fifth surface 15 and the substrate 21 in a state where the reinforcing plate 1 is attached to the rotary polishing tool 2 (see FIG. 6A). When the reinforcing plate 1 and the polishing member 22 are fixed to the rotary shaft 41 of the rotary drive machine 4, when the fixing screw 3 is screwed into the rotary shaft 41, at least one of the fifth surface 15, the substrate 21, and the polishing member 22 is used. The fifth surface 15 and the substrate 21 come into contact with each other (see FIG. 6B). The effect of this will be described later.

  As described above, the reinforcing plate 1 of the present example is configured such that the fifth surface 15 and the substrate 21 come into contact with each other when attached to the rotary polishing tool 2. Is not an essential matter in the present invention. For example, the gap between the fifth surface 15 and the substrate 21 may be reduced from the state shown in FIG. 6 (A) without being brought into contact with the screwing of the fixing screw 3. . Further, the surface in contact with the substrate 21 is not limited to the fifth surface 15 and may be the third surface 13 or the fourth surface 14.

  In the reinforcing plate 1 of this example, each surface 11-15 is made into a plane except a boundary part. The first surface 11 and the second surface 12 and the second surface 12 and the third surface 13 intersect at right angles. In addition, the third surface 13 and the fourth surface 14 and the fourth surface 14 and the fifth surface 15 are connected via a gently curved surface, and their boundaries do not appear clearly. As will be described later, at least the first surface 11 and the fifth surface 15 need to be formed as flat surfaces due to the relationship with the rotary polishing tool 2, but the other surfaces need not necessarily be flat surfaces. Alternatively, it may be formed as a curved surface, or may be a surface that does not continue over the entire circumference by providing a through hole or a gap. Also, the boundary between the surfaces may not exist clearly as a whole, and each surface may be formed as if it were one continuous surface.

  In this example, the outer diameter of the first surface 11 is 92 mm, and the outer diameter of the third surface 13 (that is, the inner diameter of the first surface 11) is 76 mm. However, the actual dimensions are limited to this. It is not a thing. Specifically, it is desirable that the first surface 11 has an outer diameter of 87 to 97 mm and the third surface 13 has an outer diameter of 71 to 81 mm.

  Further, in this example, the shape of the upper surface of the reinforcing plate 1 is such that the surface corresponding to the opposite side of the first surface 11 and the third surface 13 is formed as the same plane, and the surface corresponding to the opposite side of the fourth surface and the fifth surface is Although it is formed as a surface having a form corresponding to each surface, the present invention is not limited to this, and can be implemented as various shapes as long as it does not hinder attachment to the rotary drive machine 4.

  As described above, the reinforcing plate 1 has the first surface 11 as a polishing member contact portion. When the reinforcing plate 1 is attached to the rotary polishing tool 2, the substrate non-contact portion 22c of the polishing member 22 is provided. Abut. Then, the substrate 21 of the rotary polishing tool 2 is covered from the upper side by the third surface 13, the fourth surface 14, and the fifth surface 15 of the reinforcing plate 1.

  Next, an actual usage method of the rotary polishing tool 2 to which the reinforcing plate 1 of this example is attached will be described. In order to fix the rotary polishing tool 2 to the rotary shaft 41 of the rotary drive machine 4, the reinforcing plate 1 and the rotary polishing tool 2 are attached to the lower surface of the reinforcing plate 1 as shown in FIGS. 3 and 5A. And the upper surface of the rotary polishing tool 2 are opposed to each other, and the rotary shaft 41 is put on the rotary shaft through hole 16 of the reinforcing plate 1 and the rotary shaft mounting hole 23 of the rotary polishing tool 2 in the state of overlapping in this state. Then, the fixing screw 3 is screwed into the male screw formed on the outer periphery of the rotating shaft 41 and tightened.

  As shown in FIG. 4, the fixing screw 3 in this example has a disk shape, and a screw hole 31 having a thread is formed at the center, and four tool catching holes 32 are provided in the periphery thereof. It is supposed to have been. A tightening operation can be performed by hooking a part of the tightening tool into the tool catching hole 32. The fixing screw 3 is not limited to the form of this example, and a widely used hex nut or a combination of a flat washer and a hex nut can also be used. Alternatively, instead of using the fixing screw 3, the rotating shaft mounting hole 23 may be formed as a screw hole, and the rotating shaft mounting hole 23 may be directly screwed into the rotating shaft 41.

  In addition, since the diameter (maximum outer diameter) of the fixing screw 3 is arranged at the center of the lower surface of the substrate 21, specifically inside the partition wall 21b, the diameter is smaller than the inner diameter of the partition wall 21b. It is necessary to keep it.

  Since the polishing member 22 has a configuration in which the polishing sheets 22a are overlapped as described above, when the polishing operation is continued, the new overlapped polishing sheet 22a gradually appears. That is, as the polishing sheet 22a exposed on the lower surface of the polishing member 22 becomes worn, the polishing sheet 22a hidden inside appears, so that the polishing operation can be continued.

  When polishing is performed using the rotary polishing tool 2 and the polishing member 22 is worn, and the outer peripheral edge thereof becomes substantially equal to the outer diameter of the reinforcing member 1 as shown in FIG. Polishing cannot be continued at the outer peripheral edge. In the conventional rotary polishing tool, it must be discarded at this point, but in the present invention, the reinforcing plate 1 can be removed at this point. Specifically, the fixing screw 3 is once removed from the rotary shaft 41 of the rotary drive machine 4, the reinforcing plate 1 is removed from the rotary shaft 41, and then only the rotary polishing tool 2 is attached to the rotary shaft 41 again.

  By removing the reinforcing plate 1 in this way, it is possible to continue the polishing. As shown in FIG. 5C, the polishing member 22 is worn and its outer peripheral edge portion is almost equal to the outer diameter of the substrate 21. The rotary polishing tool 2 can be used until they are equal. Further, the reinforcing plate 1 removed from the rotary polishing tool 2 as described above can be attached to another rotary polishing tool 2 and reused.

  Note that the rotary polishing tool 2 according to the present invention is not limited to when the polishing member 22 is worn as described above, and the reinforcing plate 1 can be removed from the beginning and used. In this case, the polishing member 22 bends at the time of polishing in the portion where the substrate 21 does not exist as described above, and this bending makes it possible to softly press the polishing member 22 against the object to be polished. Polishing of the curved portion of the workpiece is easy. That is, not only when the polishing member 22 is worn, but the user of the rotary polishing tool 2 selects use / nonuse of the reinforcing plate 1 to strongly press the polishing member 22 against the object to be polished, Depending on the situation, it is possible to use a polishing tool 2 that is softly pressed against a polished object, and can be used as a rotary polishing tool 2 that is very easy to use.

  Here, the reinforcing plate 1 according to the present invention can be arranged from the upper side of the rotary polishing tool 2 so as to cover the substrate 21 and at least a part of the substrate non-contact portion 22c. Since the invention described in Patent Document 1 by the inventor of the present application connects the ring-shaped member to the substrate, the rigidity is divided at the connected boundary. Therefore, the ring-shaped member may be warped from the boundary between the substrate and the ring-shaped member under the pressing force during polishing, and the effect of preventing the polishing member from bending is not perfect. On the other hand, since the reinforcing plate 1 according to the present invention is composed of a single piece, the polishing member 22 can be reliably supported without the rigidity being divided as described above, and the rotary polishing tool 2 In the state where the reinforcing plate 1 is attached to the steel plate, reliable polishing without blurring is possible.

  Here, when the rotary polishing tool 2 provided with the reinforcing plate 1 is fixed to the rotary shaft 41 of the rotary drive machine 4, the fifth surface (substrate contact surface) 15, At least one of the substrate 21 and the polishing member 22 bends, and the fifth surface 15 and the upper surface of the substrate 21 come into contact with each other as shown in FIG. This bending is transmitted in the radially outward direction, and a downward pressing force P is generated on the first surface (abrading member contact portion) 11 as shown in FIG. Therefore, since the substrate non-contact portion 22c of the polishing member 22 is pressed downward by this pressing force P, compared to the case where the first surface 11 and the substrate non-contact portion 22c are merely in contact, The polishing member 22 can be supported more strongly, and the polishing member 2 can be provided with higher rigidity.

  Note that, as described above, the gap between the fifth surface 15 and the substrate 21 is reduced from the state shown in FIG. 6 (A) until it comes into contact with the screwing of the fixing screw 3 and does not reach. Even so, the above action occurs. The same applies to the case where the surface in contact with the substrate 21 is not the fifth surface 15 but the third surface 13 or the fourth surface 14.

  In the present example, as described above, the vertical sizes of the gaps between the substrate 21 and the reinforcing plate 1 on the third surface 13, the fourth surface 14, and the fifth surface 15 are substantially equal (FIG. 5). (Refer to (A) and (B)), when fixing to the rotating shaft 41, the entire surfaces 13 to 15 are all transferred to the substrate 21 by transmitting the deflection from the fifth surface 15 in the radially outward direction as described above. It is possible to make it contact. In this way, the reinforcing plate 1 and the rotary polishing tool 2 abut on a wide surface, so that idling is unlikely to occur between the reinforcing plate 1 and the rotary polishing tool 2 even during polishing, and the rotational force of the rotary shaft 41 is reduced. It can be transmitted to the polishing member 22 without loss.

(A) is a top view which shows the form of the reinforcement board of this example, (B) is the side view, (C) is the bottom view. It is AA arrow sectional drawing in FIG. 1 (A). It is a perspective view which shows the combination point of the rotary polishing tool of this example, and a reinforcement board. It is a perspective view at the time of upside down which shows a mode at the time of combining the rotary polishing tool and reinforcement board of this example, and attaching to a rotary drive machine. It is a longitudinal cross-sectional view which shows the state which combined the rotary polishing tool of this example, and the reinforcement board, (A) is a thing at the time of a use start, (B) is a state in which the polishing member was worn, (C) is reinforcement. The state where the abrasive member is further worn with the plate removed is shown. It is explanatory drawing which expanded the principal part about the rotation polishing tool and reinforcement board of this example, (A) shows the center part in the state which only overlapped the rotation polishing tool and the reinforcement board, (B) is rotation. The center part in the state which attached the grinding | polishing tool and the reinforcement board to the rotational drive machine is shown, (C) shows a mode that a 1st surface presses a grinding | polishing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcement plate 11 1st surface, grinding | polishing member contact part 12 2nd surface 13 3rd surface 14 4th surface 15 5th surface, board | substrate contact surface 16 Rotating shaft through-hole of reinforcement plate 2 Rotating polishing tool 21 Substrate 22 Polishing Member 22a Polishing sheet 22b Substrate contact part 22c Substrate non-contact part 23 Rotating polishing tool rotating shaft mounting hole 4 Rotating drive 41 Rotating shaft

Claims (5)

The first surface (11) to the fifth surface (15) are present concentrically in order from the outer peripheral edge to the center on the lower surface of the substantially disk-shaped body.
Of the above, the first surface (11), the third surface (13), and the fifth surface (15) are each in a parallel relationship with respect to the vertical direction,
And, the third surface (13) is present above the first surface (11), and the fifth surface (15) is present above the third surface (13).
A 2nd surface (12) is a surface extended in an up-down direction which connects the inner periphery of the 1st surface (11), and the outer periphery of the 3rd surface (13),
The fourth surface (14) connects the inner peripheral edge of the third surface (13) and the outer peripheral edge of the fifth surface (15).
At least the first surface (11) and the fifth surface (15) are flat surfaces,
The center of the fifth surface (15) is provided with a rotation shaft through hole (16) through which a rotation shaft (41) of a rotary drive machine (4) such as a grinder can be passed. Reinforcing plate for polishing tool.   The rotation according to claim 1, characterized in that the outer diameter of the first surface (11) is 87 to 97 mm and the outer diameter of the third surface (13) is 71 to 81 mm. Reinforcing plate for polishing tool. Rotation comprising a substantially disk-shaped substrate (21) that can be fixed to the rotation shaft (41) of a rotary drive machine (4) such as a grinder, and a polishing member (22) provided below the substrate (21). The reinforcing plate (1) according to claim 1 or 2 is attached to the polishing tool (2),
The polishing member (22) includes a plurality of polishing sheets (22a) that are sequentially shifted in the circumferential direction and fixed to at least a region near the outer edge of the lower surface of the substrate (21).
The outer diameter of the polishing member (22) is larger than the outer diameter of the substrate (21),
The substrate (21) is provided with a rotation shaft mounting hole (23) through which the rotation shaft (41) can pass.
The reinforcing plate (1) has the first surface (11) in contact with the polishing member (22),
In any of the third surface (13), the fourth surface (14), and the fifth surface (15), the vertical distance with respect to the first surface (11) is
Greater than the vertical distance between the upper surface of the polishing member (22) and the upper surface of the substrate (21) at the radial position corresponding to the reinforcing plate (1) of the rotary polishing tool (2);
The outer diameter of the third surface (13) is larger than the diameter of the substrate (21);
The substrate (21) is covered from above by the third surface (13), the fourth surface (14), and the fifth surface (15) of the reinforcing plate (1),
The contact of the first surface (11) with the polishing member (22) is made on the portion (22c) of the upper surface of the polishing member (22) where no substrate exists,
The fifth surface (15) is an upper surface of the substrate (21) when the rotary polishing tool (2) and the reinforcing plate (1) are both fixed to the rotation shaft (41) of the rotary drive machine (4). A rotary polishing tool provided with a reinforcing plate, wherein Rotation comprising a substantially disk-shaped substrate (21) that can be fixed to the rotation shaft (41) of a rotary drive machine (4) such as a grinder, and a polishing member (22) provided below the substrate (21). The reinforcing plate (1) is attached to the polishing tool (2),
The polishing member (22) includes a plurality of polishing sheets (22a) that are sequentially shifted in the circumferential direction and fixed to at least a region near the outer edge of the lower surface of the substrate (21).
The outer diameter of the polishing member (22) is larger than the outer diameter of the substrate (21),
The substrate (21) is provided with a rotation shaft mounting hole (23) through which the rotation shaft (41) can pass.
Of the upper surface of the polishing member (22), a portion bonded to the substrate (21) is a substrate contact portion (22b), and a portion of the substrate (21) protruding outside in the radial direction is not in contact with the substrate. Part (22c),
The reinforcing plate (1) is substantially disc-shaped and has a size that is not more than the diameter of the polishing member (22) and exceeds the diameter of the substrate (21).
On the lower surface, the substrate covering portion (12-15) provided with a rotation shaft through hole (16) through which the rotation shaft (41) can be passed together with the rotation shaft mounting hole (23) of the rotation polishing tool (1). However, the polishing member abutting portions (11) are respectively formed on the outer diameter side than the substrate covering portions (12 to 15),
From the upper side of the rotary polishing tool (2), the substrate (21) and the substrate non-contact part (22c) can be coordinated so as to cover at least a part thereof,
The rotary polishing tool provided with a reinforcing plate, wherein the polishing member contact portion (11) contacts the substrate non-contact portion (22c). On the lower surface of the reinforcing plate (1), there is a substrate contact surface (15) near the center of the substrate covering portion (12-15),
The substrate abutting surface (15) is at least partially when the reinforcing plate (1) is fixed to the rotating shaft (41) of the rotary driving machine (4) in a state where the reinforcing plate (1) is attached to the rotating polishing tool (2). The rotary polishing tool provided with the reinforcing plate according to claim 4, wherein the abutment comes into contact with the substrate (21).

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