JPH11262863A - Grinding wheel mounting structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a grinding wheel mounting structure that can easily center a grinding wheel and a grinding wheel shaft. A grinding wheel 1 having an abrasive layer formed on the outer periphery of a core material, a grinding wheel 4 to which the grinding wheel is attached, and a presser for fixing the grinding wheel to the grinding wheel shaft. And a lid 6. The grinding wheel 1 has a side surface on the side of the grinding wheel shaft 4 and a side surface on the side of the holding lid 6.
Tapered holes 1b and 1c perpendicular to these side surfaces are opened, and the ends of the grinding wheel shaft 4 and the holding lid 6 on the side where the grinding wheel is mounted are respectively located at the center positions relative to the tapered holes 1b and 1c of the grinding wheel. Tapered projections 4b, 6a
And plane portions 4c and 6b perpendicular to the center line of the projection are formed. Further, bolt holes 7 are formed in the grinding wheel 1, the grinding wheel shaft 4 and the holding lid 6 for connecting them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a grinding wheel used in machining, and more particularly to a mounting structure of a grinding wheel capable of easily aligning a grinding wheel with a grinding wheel shaft.

[0002]

2. Description of the Related Art As a conventional grinding wheel mounting method, for example, the one shown in FIG. 4 is known. In the example of the figure, as a configuration for attaching the grinding wheel to the grinding machine,
A grinding wheel 1 having a cylindrical hole 1a at the center, and a projection 2
a, a flange 2 having a tapered hole 2b at the center, an annular member 3 forming a pair with the flange, and a grinding wheel shaft 4 having a tapered portion 4a facing the tapered hole 2b of the flange 2.
The grinding wheel 1 is inserted into the cylindrical hole 1a with the projection 2a of the flange 2 and then tightened by the annular member 3 to be integrated.

Further, the integrated grinding wheel 1, flange 2 and annular member 3 form a tapered portion 4a of a grinding wheel shaft 4.
After being inserted so that the tapered hole 2 a of the flange 2 coincides with the flange 2, it is attached to the grindstone shaft 4 by the fixing nut 5.

[0004]

However, in such a conventional grinding wheel mounting structure, a flange 2 is required.
Are mounted so that the tapered hole 2a and the tapered portion 4a of the grinding wheel shaft 4 coincide with each other, so that they can be mounted without shifting their respective center positions. However, the grinding wheel 1 and the flange 2 have the same structure. In addition, since a clearance is required between the cylindrical hole 1a and the projection 2a, it is difficult to accurately adjust the center.

The mounting error between the grinding wheel 1 and the flange 2 affects the imbalance after the mounting of the grinding machine, and becomes more remarkable as the wheel rotation speed increases. Therefore, in performing high-speed grinding, it is difficult to perform truing work at the rotational speed at which the grinding wheel is used.

[0006] In addition, even in the case of metal bond or electrodeposited diamond grindstone where it is difficult to perform truing after mounting the grinder in terms of performance and cost, the mounting error greatly affects the processing accuracy and may cause a problem.

Further, the flange 2 and the grinding wheel shaft 4 come into contact with each other through a tapered hole 2b and a tapered portion 4a, and are fastened to the grinding wheel shaft 4 of the grinding machine by a fixed nut 5.
When the grinding wheel shaft 4 rotates at a high speed, the tapered hole 2b of the flange 2 expands due to the centrifugal expansion, and there is a possibility that problems such as cutting into the grinding wheel shaft 4 and loosening of the fixing nut 5 may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a mounting structure of a grinding wheel which can easily center a grinding wheel and a grinding wheel shaft. And

[0009]

In order to achieve the above object, a grinding wheel mounting structure according to claim 1 is characterized in that a grinding wheel in which an abrasive layer is formed on the outer periphery of a core material, and the grinding wheel. A whetstone to which a whetstone is attached, and a holding lid for fixing the whetstone for grinding to the whetstone shaft. The whetstone for grinding has a whetstone shaft side surface and a holding lid side surface. In each of these, a tapered hole orthogonal to these side surfaces is opened, and the end of the grinding wheel shaft and the holding lid on the side where the grinding wheel is mounted is located at a center position relative to the tapered hole of the grinding wheel. A tapered projection and a flat portion perpendicular to the center line of the projection are formed, and further, the grinding wheel, the grinding wheel shaft and the holding lid are formed with bolt holes for connecting them. Is characterized by

According to the first aspect of the present invention, when the grinding wheel is mounted on the grinding wheel shaft of the grinding machine, the flat portion of the grinding wheel shaft and the side surface of the grinding wheel, and the side surface of the other grinding wheel and the flat surface of the holding lid are provided. Part is fixed so as to make surface contact, and the tapered hole formed in the center of the grinding wheel serves as a guide to the grinding wheel,
The center of the grinding wheel axis and the presser lid always coincide. Accordingly, no positional deviation occurs when the grinding wheel is mounted, so that the imbalance after mounting the grinding machine can be extremely reduced.

[0011] In addition, by performing the balancing in the manufacturing stage based on the tapered hole, the grinding at the time of mounting can be omitted, and the working efficiency is greatly improved.

Further, according to the present invention, since the grinding wheel itself does not require a complicated structure and the stress due to centrifugal force can be reduced, it can be applied to high-speed grinding. Of the grinding wheel does not cut into or loosen the tapered hole of the grinding wheel.

Further, in the grinding wheel mounting structure according to the second aspect, the tip outer diameter of a tapered projection formed at an end of the grinding wheel shaft and the holding lid on the side on which the grinding wheel is mounted is set to be equal to or smaller than the outer diameter. The grinding wheel is formed to be larger than the inner diameter of the tapered hole at a position corresponding to the above, and a hole is formed at the center of the tapered projection.

According to the second aspect of the present invention, when the grinding wheel is mounted on the grinding wheel shaft and tightened with the bolt while holding down the holding lid, the tapered projections of the grinding stone and the holding lid are elastically deformed. A force is generated that presses the grinding wheel from the center toward the outer periphery. For this reason, the flat portion formed on the end face of the grinding wheel shaft and the flat face portion of the end face of the presser lid are restrained by two faces, respectively, and are more securely fixed.

Further, since the projection is elastically deformed,
Even when the grinding wheel rotates at high speed, it follows the expansion due to the centrifugal force of the grinding wheel and always restrains the grinding wheel on two surfaces, a projection and a flat surface. Holding is possible.

According to a third aspect of the present invention, there is provided a grinding wheel mounting structure, wherein the center hole and the projection are formed on tapered projections formed on the grinding wheel shaft and on the end face of the holding lid on which the grinding wheel is mounted. A cutout communicating with the outer periphery is formed.

According to the third aspect of the present invention, when the grinding wheel is attached to the grinding wheel shaft, and when the bolt is tightened by the bolt while being held down by the presser lid, the protrusions of the grindstone shaft and the presser cover are easily elastically deformed. It will be easier.

[0018]

According to the first aspect of the present invention, no misalignment occurs when the grinding wheel is mounted, so that the imbalance after mounting the grinding machine can be extremely reduced. In addition, by performing the balancing in the manufacturing stage on the basis of the tapered hole, the balancing at the time of mounting can be omitted, and the working efficiency is dramatically improved. Furthermore, since the grinding wheel itself does not require a complicated structure and the stress due to centrifugal force can be reduced, it can be applied to high-speed grinding.In addition, even when the grinding wheel rotates at high speed, the tapered projections Does not cut into or loosen holes.

According to the second aspect of the present invention, since the flat portion formed on the end surface of the grinding wheel shaft and the flat portion of the end surface of the presser lid are respectively restrained on two surfaces, the grinding wheel is more securely fixed.

According to the third aspect of the present invention, since the grinding wheel shaft and the projection of the holding lid are easily elastically deformed, the tightening operation becomes extremely easy.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a sectional view showing an embodiment of a grinding wheel mounting structure of the present invention, wherein 1 is a grinding wheel having an abrasive layer formed on the outer periphery of a core, and 4 is a grinding wheel of a grinding machine. The shaft 6 is a holding lid for the grinding wheel.

The grinding wheel 1 is provided at the center of the side of the grinding wheel shaft 4 and the side of the holding lid 6 perpendicular to the rotation center.
Holes 1b and 1c opening to the side and the holding lid 6 side
Are formed.

In the center of the grinding wheel shaft 4 and the holding lid 6, tapered projections 4b and 6a are formed at positions corresponding to the tapered holes 1b and 1c of the grinding wheel 1, respectively.
Plane portions 4c and 6b orthogonal to the center lines of b and 6a are formed.

Further, each of the grinding wheel 1, the wheel shaft 4 and the holding lid 6 is provided with a bolt hole 7 at the same position from the center of each.

Next, the operation will be described. When attaching the grinding wheel 1 to the grinding wheel shaft 4 of the grinding machine, the flat portion 4c of the grinding wheel shaft 4
And the side surface of the grinding wheel 1 and the side surface of the other grinding wheel 1 and the flat portion 6b of the holding lid 6 are fixed so as to make surface contact.

At this time, the tapered holes 1b and 1c formed in the center of the grinding wheel 1 serve as guides, and the center of the grinding wheel shaft 4 and the center of the grinding wheel 1 and the center of the grinding wheel 1 and the center of the holding lid 6 are provided. Will always match. Thereby, since no displacement occurs when the grinding wheel 1 is mounted, the imbalance after the mounting of the grinding machine can be extremely reduced.

The grinding wheel 1 can be balanced in the manufacturing stage with reference to the tapered holes 1b and 1c.
Even after the grinding machine is mounted, the state becomes equal to the state where the balance is performed, so that the balance at the time of mounting can be omitted, and the working efficiency is dramatically improved.

Further, the grinding wheel 1 according to the present embodiment comprises:
For example, as described in Japanese Patent Application Laid-Open No. 7-328,919, the grinding wheel itself does not require a complicated birch structure, which can reduce stress concentration due to centrifugal force, thereby enabling high-speed rotation and high-speed grinding. Applicable.

In addition, when the grinding wheel 1 is mounted,
By tightening a bolt 7 for integrally fixing the grinding wheel 1, the grinding wheel shaft 4 and the presser cover 6, the side surface of the grinding wheel 1 finally becomes the flat portion 4c of the grinding wheel shaft 4 and the presser cover 6
Since the grinding wheel 1 is rotated at a high speed, the tapered projection does not bite into the tapered hole of the grinding wheel or loosen even when the grinding wheel 1 rotates at a high speed.

Second Embodiment FIG. 2 is a sectional view showing another embodiment of a grinding wheel mounting structure of the present invention. This embodiment is different from the first embodiment shown in FIG. The outer diameter of the tip of the tapered projections 4b, 6a of the presser lid 6 is made larger than the inner diameter of the tapered holes 1b, 1c of the grinding wheel 1 at a position opposite thereto. And the protrusion 4 of the holding lid 6
Central holes 4d and 6c are formed in the center of b and 6a.

According to the mounting structure of this embodiment, when the grinding whetstone 1 is mounted on the whetstone shaft 4 and tightened with bolts while being held down by the holding lid 6, the projections 4b and 6a of the whetstone shaft 4 and the holding lid 6 are elastically deformed. As a result, a radial force is generated which presses the grinding wheel 1 from the center toward the outer periphery, so that the flat surface portion 4c formed on the end surface of the grinding wheel shaft 4 and the flat surface portion 6b of the end surface of the presser lid 6 are respectively 2 As a result, the grinding wheel 1 is more securely fixed.

Further, since the projections 4b and 6a are elastically deformed, even when the grinding wheel 1 rotates at high speed, the grinding wheels 1 follow the expansion due to the centrifugal force, and the projections 4b 6a
Since the grinding wheel 1 is constrained by the two surfaces of the flat surface portions 4c and 6b, the grinding wheel 1 made of a core material having a large elongation can be reliably held.

In the present embodiment, the outer diameter of the tapered projection of the first embodiment shown in FIG. 1 is made larger than the inner diameter of the tapered hole of the grinding wheel at a position opposite thereto, and furthermore, By providing a hole at the center, instead of elastically deforming the protrusion, the same effect can be obtained by inserting an annular elastic body into the gap between the protrusion of the grinding wheel shaft and the holding lid and the tapered hole of the grinding wheel. can get.

Third Embodiment FIG. 3 is a cross-sectional view showing still another embodiment of the grinding wheel mounting structure of the present invention, and the tapered projection 6a of the presser lid 6 of the second embodiment shown in FIG. And a notch 6d communicating the outer periphery of the projection 6a with the center hole 6c.
In this embodiment, a similar notch is also formed in the tapered projection of the grinding wheel shaft.

According to the mounting structure of the present embodiment, when the grinding whetstone is attached to the whetstone and tightened with the bolt while holding down the holding lid, the whetstone shaft and the projection 6a of the holding lid 6 are easily elastically deformed. Is significantly easier.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a grinding wheel mounting structure of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the grinding wheel mounting structure of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the mounting structure for a grinding wheel of the present invention.

FIG. 4 is a cross-sectional view showing a conventional grinding wheel mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Grinding wheel 1a ... Cylindrical hole 1b ... Tapered hole 1c ... Tapered hole 2 ... Flange 2a ... Projection 2b ... Tapered hole 3 ... Annular member 4 ... Grindstone shaft 4a ... Tapered part 4b ... Projection 4c ... Flat part 4d: center hole 5: fixing nut 6: holding lid 6a: projection 6b: flat portion 6c: center hole 6d: cutout portion 7: bolt hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Minoru Ota Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa

Claims (3)

[Claims] 1. A grinding wheel having an abrasive layer formed on the outer periphery of a core material, a grinding wheel to which the grinding wheel is attached, and a presser for fixing the grinding wheel to the grinding wheel shaft. The grinding wheel for grinding has a tapered hole opened on each of a side surface on the side of the grinding wheel shaft and a side surface on the side of the holding lid, and a taper hole orthogonal to these side surfaces is provided. At the end of the lid on the side where the grinding wheel is mounted, a tapered projection corresponding to the tapered hole of the grinding wheel and a flat portion orthogonal to the center line of the projection are formed at the respective center positions, Further, the grinding wheel, the wheel shaft and the presser lid,
A mounting structure for a grinding wheel, wherein bolt holes for connecting these are formed. 2. An outer diameter of a tip of a tapered projection formed at an end of the grinding wheel shaft and the holding lid on a side on which the grinding wheel is mounted is a tapered hole of the grinding wheel at a position opposed thereto. 2. The grinding wheel mounting structure according to claim 1, wherein the inner diameter is larger than an inner diameter, and a hole is formed at a center of the tapered protrusion. 3. A notch portion is formed in a tapered projection formed on an end surface of the grinding wheel shaft and the holding lid on a side on which the grinding wheel is mounted, so as to communicate the center hole with an outer periphery of the projection. The mounting structure for a grinding wheel according to claim 2, wherein: