JP2006198707A - Grinding tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve working accuracy of polishing, grinding or cutting work and durability of mounting components in a grinding tool capable of reducing generation amount of waste. <P>SOLUTION: The mounting part 16, of which one side projects in tapered shape to the axial direction of a rotating shaft 5 and the other side invaginates in tapered shape to the axial direction of the rotating shaft 5, is uniformly formed at the whole peripheral edge of through-hole 11 side of a ring plate shape grinding wheel A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a grinder tool.

  There are various types of grindstones for grinder tools that are used by being mounted on a grinder, and offset grindstones in which the central portion protrudes in a truncated cone shape toward the anti-polishing surface side are often used. As shown in FIG. 4, the offset grindstone B includes a frustoconical offset portion 1 at the center and a ring plate-shaped polishing portion 2 continuous to the outer periphery of the offset portion 1. Is composed of a tapered portion 1b corresponding to the inclined surface of the truncated cone and a flange portion 1a projecting inward from the tapered portion 1b. The offset grindstone B is formed by applying the flange portion 1a of the offset portion 1 to the mounting flange 6 provided on the rotating shaft 5 of the grinder, screwing the mounting screw 4 to the rotating shaft 5, and tightening. It is fixed to the rotating shaft 5. The offset portion 1 serves as an attachment portion that is sandwiched between the attachment flange 6 and the attachment screw 4 from both sides.

  When the grinding wheel 2 is worn and the offset grinding wheel B becomes unusable, the offset part 1 is discarded (the part shown in FIG. 5 is discarded). Thus, the offset-type grindstone B has a large ratio of being discarded without being used with respect to the entire grindstone, and there are problems such as environmental aspects and economy.

Then, there exists a rotary polishing tool described in patent document 1 as an object for solving such a problem. As shown in FIG. 6, the rotary polishing tool C includes a polishing member 10, a central member 11 that fixes the polishing member 10 to a grinder, and a fixing screw 7. The polishing member 10 is formed in a ring plate shape, and no offset portion is provided. On the inner periphery of the polishing member 10, a protruding portion 12 is provided as an attachment portion. The protruding portion 12 is rotationally engaged with a groove portion 13 provided in the central member 11, and the polishing member 10 is connected to the grinder 6. It is attached to. And since the said rotary polishing tool C can use the polishing member 10 to the point of the protrusion part 12, it can reduce the generation amount of a waste material.
Japanese Patent Laid-Open No. 11-70475

  However, the conventional rotary polishing tool C can reduce the amount of waste generated as described above, but has the following problems.

  First, during the polishing operation, stress is concentrated on the two engaging portions (the protruding portion 12 and the groove portion 13) of the polishing member 10 and the central member 11. Therefore, the force transmitted from the grinder to the polishing member 10 through the central member 11 is not uniform over the circumferential direction of the polishing member 10.

  The second problem is that when the polishing operation is repeated, a large shearing force acts on the partition portion 14 of the groove portion 13 that locks the protrusion 12 of the polishing member 10 due to the stress concentration. That is, the partition 14 is consumed and the central member 11 needs to be replaced. As the material of the central member 11, it is conceivable to use a steel material having high strength in order to improve durability in place of the hard synthetic resin that is usually used. Since the same material or a material having the same strength is required for the above-mentioned protrusion 12, the manufacturing cost of the polishing member 10 is expensive, which is substantially difficult.

  The present invention has been made in view of such points, and an object of the present invention is to provide work accuracy such as polishing, grinding, or cutting and mounting for a grinder tool capable of reducing the amount of waste generated. The purpose is to improve the durability of the parts.

  In order to solve the above problems, in the present invention, unlike the polishing member according to Patent Document 1, a high-strength tapered attachment portion is provided on the entire periphery on the through-hole side of the ring plate-shaped grindstone. It was made to provide like.

That is, the invention of claim 1 is a ring plate-shaped grindstone in which a through hole through which a rotating shaft of a grinder is inserted is formed in the center,
On the entire periphery of the grindstone on the through hole side, one surface projects in a taper shape in the axial direction of the rotating shaft, and the opposite surface tapers in the axial direction of the rotating shaft. A ring plate-shaped grindstone characterized in that mounting portions sandwiched from both sides are uniformly formed.

  Therefore, since the ring plate-shaped grindstone has a smaller amount of attachment parts discarded after use than the conventional offset grindstone, the amount of waste generated can be reduced, and the attachment part Since it is uniformly formed on the entire periphery on the side of the through hole, stress does not concentrate at a specific position when used by being mounted on a grinder.

  Further, the mounting portion protruding in a taper shape functions as an annular rib for reinforcing the grindstone, so that the strength of the grindstone itself is higher than that of the grindstone formed flat.

The invention of claim 2 is a ring plate-shaped grindstone of claim 1,
A through-hole or a female screw hole having a frustoconical offset portion at the center and a lower flange portion of a ring plate shape continuous with the outer periphery of the offset portion, through which the rotating shaft of the grinder is inserted or screwed. A mounting pad formed in the center;
A mounting screw having a truncated cone part and having a female screw hole formed in the center thereof, into which the rotating shaft of the grinder is screwed,
The mounting pad is formed so that a portion from the tapered portion corresponding to the slope of the offset portion to the lower flange portion matches the side of the mounting portion of the grindstone that protrudes in a tapered shape over the entire circumference. ,
The mounting screw is formed so that the truncated cone part coincides with the tapered side of the mounting part of the grindstone, and the mounting part of the grindstone is attached from both sides by the mounting pad and the mounting screw. It is a grinder tool characterized by being pinched.

  Therefore, the mounting pad and the mounting screw are formed so that the contact surface with the ring plate-shaped grindstone of claim 1 is uniformly formed over the entire circumference in the circumferential direction of the through-hole or the female screw hole in the same manner as the grindstone. Therefore, stress does not concentrate at a specific position during use.

  Further, when the grindstone is mounted on the grinder, even if the center of the grindstone is slightly deviated from the rotation axis of the grinder, it is automatically controlled by the taper gradient formed on each of the grindstone and the mounting pad. Therefore, it is not necessary to align the position accurately, and the center of the grindstone can be easily aligned with the rotating shaft.

  According to the first aspect of the present invention, the amount of waste generated can be reduced as compared with the conventional offset type grindstone, and the mounting portion is integrated with the entire peripheral edge of the ring plate-shaped grindstone on the through hole side. Therefore, stress does not concentrate at a specific position during use. That is, the force from the grinder is uniformly transmitted to the grindstone over the entire circumference in the circumferential direction of the grindstone. Therefore, regarding the grindstone that can contribute to environmental conservation, resource saving, and manufacturing cost reduction, it is possible to improve the work accuracy of polishing, grinding, cutting, or the like.

  According to the second aspect of the present invention, the mounting pad and the mounting screw have a uniform contact surface with the ring plate-shaped grindstone of the first aspect over the entire circumference in the circumferential direction of the through hole or the female screw hole. Since it is formed, stress does not concentrate at a specific position during use. That is, the specific positions of the mounting pad and the mounting screw are not consumed. Therefore, durability can be improved regarding the grinder tool which can contribute to environmental conservation, resource saving, and reduction of manufacturing cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A ring plate-shaped grindstone is used for various applications such as polishing, grinding, and cutting, and is manufactured according to the application. In the embodiment of the present invention, description will be made regarding a ring plate-shaped grindstone for polishing. However, it is not limited to this application. FIG. 1 shows a ring plate-shaped grindstone A according to an embodiment of the present invention.

  The ring plate-shaped grindstone A is formed with a circular through hole 11 through which the rotating shaft 5 of the grinder is inserted in the center, and is formed into an annular polishing portion 2 and a tapered shape continuous to the inner peripheral side thereof. The attachment part 16 is provided. That is, on the entire periphery of the grindstone A on the through hole 11 side, one surface (anti-polishing surface 2 b) projects in a taper shape in the axial direction of the rotating shaft 5, and the other surface (polishing surface 2 a) is on the rotating shaft 5. A mounting portion 16 that is tapered in the axial direction is uniformly provided.

  The diameter of the through hole 11 is preferably 2 to 5 times the diameter of the rotating shaft 5 or 0.2 to 0.5 times the diameter of the grindstone A. Further, it is preferable that the taper gradient of the mounting portion 16 is 40 degrees to 50 degrees with the same gradient on the polishing surface 2a side and the anti-polishing surface 2b side. Moreover, it is preferable that the protrusion height and the indentation depth of the mounting portion 16 be 0.02 to 0.05 times the diameter of the grindstone A.

  The cross-sectional structure of the grindstone A is a two-layer structure in which a polishing layer 17 and a base layer 18 on the back surface of the polishing layer 17 are laminated. The polishing layer 17 and the base layer 18 are made of an abrasive blend in which abrasive grains and a binder are blended. The base layer 18 uses finer abrasive grains than the polishing layer 17. The grindstone A is manufactured by integrally pressure-molding and firing the abrasive composition of the polishing layer 17 and the abrasive composition of the base layer 18. A glass cloth 15 is embedded as a reinforcing core between the two layers. Known abrasives such as silicon carbide and alumina are used for the abrasive grains, and known ones such as phenol resin are used for the binder. In addition, you may mix | blend the rubber powder etc. for reducing the noise and vibration at the time of grinding | polishing operation | work with the said abrasive grain compounding. The cross-sectional structure of the grindstone A is not limited to the two-layer structure described above. Further, the polishing layer 17 may be a strip-shaped abrasive such as sandpaper attached to the base layer 18.

  Since the grinding wheel A has a smaller amount of the mounting portion discarded after use than the conventional offset grinding wheel, the amount of waste generated can be reduced. Further, since the mounting portion 16 is uniformly provided on the entire periphery on the through-hole 11 side, stress does not concentrate at a specific position when used by being mounted on a grinder. Further, since the mounting portion 16 protruding in a taper shape functions as an annular rib for reinforcing the grindstone, the strength of the grindstone itself is higher than that of the grindstone formed flat.

  2 and 3 show a grinder tool and a rotating shaft 5 of the grinder to which the grinder tool is attached according to the present invention. The grinder tool includes the grindstone A, and mounting pads 3 and mounting screws 4 as mounting parts for fixing the grindstone A to the grinder. The rotating shaft 5 has a male screw portion 5a at the tip, and a mounting flange 6 on the base end side. The mounting flange 6 includes a large-diameter cylindrical portion 6b and a small-diameter cylindrical portion 6a that is continuous with the large-diameter cylindrical portion 6b on the distal end side of the rotating shaft 5. The center of the large-diameter cylindrical portion 6b and the small-diameter cylindrical portion 6a coincide. The outer peripheral surface of the small-diameter cylindrical portion 6a is formed so as to match the inner peripheral surface of a through hole 21 of the mounting pad 3 described later. The rotating shaft 5 provided with the mounting flange 6 is the same as that used in the conventional offset grindstone B, and can be used as it is in the grindstone A according to the present invention.

  The mounting pad 3 is provided with a frustoconical offset portion 22 at the center and a ring plate-like lower flange portion 23 continuous to the outer periphery thereof, and the offset portion 22 corresponds to the inclined surface of the frustoconical shape. The taper portion 22b and the upper flange portion 22a projecting inward continuously from the taper portion 22b. A through hole 21 through which the rotating shaft 5 of the grinder is inserted is formed at the center of the upper flange portion 22a. The portion from the tapered portion 22b to the lower flange portion 23 is formed so as to match the taper-shaped side (the anti-polishing surface 2b side) of the mounting portion 16 of the grindstone A over the entire circumference. Yes.

  The mounting screw 4 has a truncated cone part 26 on the lower side, and a cylindrical part 25 is formed continuously on the upper surface side of the truncated cone part 26. The mounting screw 4 is formed with a female screw hole 24 in the center where the rotating shaft 5 of the grinder is screwed, and four tightening holes 28 are formed in the periphery thereof. Two tightening holes 28 are targets with the female screw hole 24 interposed therebetween. The cylindrical portion 25 matches the inner peripheral surface of the through hole 11 of the grindstone A, and the truncated cone portion 26 coincides with the side (polishing surface 2a side) of the mounting portion 16 of the grindstone A that is indented into a taper shape. It is formed to do.

  Since the mounting pad 3 and the mounting screw 4 are uniformly formed on the circumferential surface of the through hole 21 and the female screw hole 24 with respect to the grindstone A, the mounting pad 3 and the mounting screw 4 are attached to the grinder. When used, stress does not concentrate at a specific location. In the present embodiment, steel is used for the mounting pad 3 and the mounting pad 4. However, the material is not particularly limited as long as the material has sufficient strength.

  Hereinafter, the procedure for attaching the grinding wheel A to the grinder will be described in (1) to (3). For mounting the grindstone A to the grinder, the mounting pads 3 and the mounting screws 4 of the mounting parts according to the present invention are used.

  (1) Insert the rotary shaft 5 into the through hole 21 of the mounting pad 3 so that the upper surface side of the truncated cone in the offset portion 22 of the mounting pad 3 is the base end side of the rotary shaft 5; The through hole 21 is fitted into the small-diameter cylindrical portion 6 a of the mounting flange 6.

  (2) The rotary shaft 5 is inserted into the through hole 11 of the grindstone A so that the polishing surface 2a side of the grindstone A is on the tip side of the rotary shaft 5, and the mounting portion 16 of the mounting pad 3 Fit into the offset portion 22. Even if the center of the grindstone A is slightly deviated with respect to the rotary shaft 5, it is automatically corrected by the taper gradient formed on each of the grindstone A and the mounting pad 3. The center of the grindstone A can be easily aligned with the rotating shaft 5. A rubber pad may be interposed between the mounting pad 3 and the grindstone A in order to reduce noise and vibration during the polishing operation.

  (3) While the female screw hole 24 is screwed into the male screw portion 5a of the rotary shaft 5 so that the lower surface side of the truncated cone portion 26 of the mounting screw 4 is the tip side of the rotary shaft 5, The mounting screw 4 is fitted on the polishing surface 2a side of the mounting portion 16 of the grindstone A. Finally, the convex portion of the tightening tool is inserted into the tightening hole 28 and the mounting screw 4 is tightened. The mounting operation is completed by the above operation, and the grindstone A is mounted on the grinder.

  The male screw portion 5a and the female screw hole 24 are arranged such that the rotation direction when the female screw hole 24 is screwed into the male screw portion 5a is opposite to the rotation direction of the rotary shaft 5 during the polishing operation. Since it is formed, the grindstone A does not come off the rotating shaft 5 during the polishing operation.

  In the present embodiment, the mounting pad 3, the grindstone A, and the mounting screw 4 are sequentially attached to the rotating shaft 5 of the grinder. However, the parts (the grindstone A, the mounting pad 3, and the mounting screw 4) are previously provided. You may attach to the rotating shaft 5 of a grinder in the state which piled up one part or all.

Therefore, according to the present invention, with respect to the grinder tool capable of reducing the amount of generated waste, it is possible to improve work accuracy such as polishing, grinding or cutting and durability of the mounting parts.
<< Other Embodiments >>
In the present embodiment, the mounting flange 6 is not provided on the rotary shaft 5, and a female screw hole is formed instead of the through hole 21 of the mounting pad 3, so that the mounting pad 3 is connected to a grinder. It may be screwed onto the rotating shaft 5.

It is sectional drawing of the ring-plate-shaped grindstone A which concerns on this invention. 1 is a perspective view of a grinder tool according to the present invention. It is sectional drawing when the grinder tool which concerns on this invention is being fixed to the rotating shaft of the grinder. It is sectional drawing when the conventional offset grindstone B is fixed to the rotating shaft of the grinder (before use). It is sectional drawing when the conventional offset grindstone B is fixed to the rotating shaft of the grinder (after use). 2 is a perspective view of a rotary polishing tool C of Patent Document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Offset part 2 Polishing part 2a Polishing surface 2b Anti-polishing surface 3 Mounting pad 4 Mounting screw 5 Grinder rotating shaft 6 Mounting flange 11 Through hole 16 Mounting part 22 Offset part 23 Lower flange part 25 Cylindrical part 26 Frustum Part

Claims (2)

A ring plate-shaped grindstone in which a through hole through which the rotating shaft of the grinder is inserted is formed in the center,
On the entire periphery of the grindstone on the through hole side, one surface projects in a taper shape in the axial direction of the rotating shaft, and the opposite surface tapers in the axial direction of the rotating shaft. A ring plate-shaped grindstone characterized in that mounting portions sandwiched from both sides are uniformly formed. A ring plate-shaped grindstone according to claim 1;
A through-hole or a female screw hole having a frustoconical offset portion at the center and a lower flange portion of a ring plate shape continuous with the outer periphery of the offset portion, through which the rotating shaft of the grinder is inserted or screwed. A mounting pad formed in the center;
A mounting screw having a truncated cone part and having a female screw hole formed in the center thereof, into which the rotating shaft of the grinder is screwed,
The mounting pad is formed so that a portion from the tapered portion corresponding to the slope of the offset portion to the lower flange portion matches the side of the mounting portion of the grindstone that protrudes in a tapered shape over the entire circumference. ,
The mounting screw is formed so that the truncated cone part coincides with the tapered side of the mounting part of the grindstone, and the mounting part of the grindstone is attached from both sides by the mounting pad and the mounting screw. A grinder tool characterized by being pinched.

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