JPH10286770A - Grinding stone and grinding stone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform the adjustment of unbalance in safety, by forming plural mounting parts for mounting the balance weights on a base in a circumferential direction at predetermined angular intervals around an axis of rotation of a grinding stone. SOLUTION: A grinding stone 10 comprises a circular metallic base 2 and an abrasive grain layer 3 formed on an outer periphery of the base 2, and the base 2 and the abrasive grain layer 3 are integrated. This base 2 comprises plural female screws 5 in which the male screw-shaped balance weights 4 made of a metallic material, can be inserted. These female screws are installed in a circumferential direction at predetermined angular intervals around an axis of rotation of the grinding stone 10. Further the angular interval is preferably set between 5-10 deg. because the fine adjustment of balance is difficult when the angular interval is large. When the female screw is installed, it is desirable that a prepared hole is not penetrated, so that the balance weight 4 can be completely fixed to the base 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for correcting imbalance that occurs when a grinding wheel rotates.

[0002]

2. Description of the Related Art Since a grinding wheel normally rotates at a high speed when grinding a workpiece, it is necessary to take great care to prevent imbalance when mounting the grinding wheel. Even if the eccentricity or the nonuniformity of the mass is slight, the grinding wheel loses balance and vibrates under a high-speed rotation, which adversely affects the machining operation.

[0003] Further, since the grinding wheel portion of the grinding wheel itself is easily broken, the stress generated by centrifugal force at the time of unbalance also causes destruction.

Therefore, conventionally, the following two types of grinding wheels have been mainly used.

The first type has an unbalance adjustment mechanism provided on a flange for attaching a grinding wheel to a grinding wheel shaft of a grinding apparatus, and is configured as shown in FIGS. 3 to 5, for example. FIG. 3A is a schematic longitudinal sectional view of a grinding wheel 20 as a first type of grinding wheel, FIG. 3B is a partial front view showing a part of the front surface of the grinding wheel 20, FIG. 3 is a schematic longitudinal sectional view of the vicinity of the center of the grinding wheel 20 mounted on the grinding wheel shaft 1. FIG.

As shown in FIG. 4, a grinding wheel 20 is attached to a wheel shaft 1 via flanges 21 and 22. Of these two flanges, the one fixed to the grinding wheel shaft 1 may be referred to as a fixed side flange, and the other may be referred to as a moving side flange. The diameters of the flanges 21 and 22 are equal to each other, and the value is set to, for example, one third or more of the diameter of the grinding wheel 20. The grindstone portion 23 is sandwiched between the outer peripheral portions of the flanges 21, 21, and the flanges are fixed to each other by four bolts 24. The flanges 21, 2
For example, a blotter or a rubber washer having a thickness of 0.5 mm or less is sandwiched between the outer peripheral portion 2 and the grindstone portion 23. In this way, the stress applied to the grinding wheel is dispersed.

To correct the imbalance of the grinding wheel, an unbalance adjusting mechanism 25 provided on the flange 22 is operated. FIG. 5 is an enlarged view of the unbalance adjuster 25. The adjustment piece (balance weight) 25a is provided by loosening the screw 25b.
It can move freely along the guide groove 25c formed in the circumferential direction. When the position is determined, the screw 25b is tightened to fix the balance weight 25a. Guide groove 25c
There are a plurality of balance weights 25a on the upper side, and the grinding wheel 20 is balanced by moving these fixed positions. In order to determine the position, a dynamic balancer for calculating the position of the unbalanced weight from the vibration during the rotation of the grinding wheel is usually used.

The second type has no unbalance adjustment mechanism, and adjusts the balance by directly attaching a balance weight (specifically, a metal piece) to the flange. The sticking position is determined by the dynamic equilibrium tester as described above.

[0009]

However, the first type of grinding wheel described above has a structure in which the balance weight can be fixed at any position in the circumferential direction. In order to attach the balance weight to the inclined position, it is necessary to measure the angle with a protractor or the like each time.

In the grinding wheel of the second type described above, an adhesive or the like is used for fixing the adjustment piece.
At the time of rotation, there is a danger that the adjustment piece will peel off and scatter to the operator. In addition, if the adjustment piece is peeled off, the grinding wheel will suddenly fall into an unbalanced state, and the grinding wheel itself may be broken.

Some grinding machines have a function of automatically correcting imbalance of a grinding wheel, but this kind of grinding machine is generated during machining for the purpose of high-precision grinding. It corrects a minute imbalance of the grinding wheel, and cannot correct unbalance such as unevenness of the mass of the grinding wheel and eccentricity caused by mounting.

In view of the problems described above, an object of the present invention is to provide a grinding wheel with an unbalance adjustment mechanism that can easily and safely perform unbalance adjustment.

[0013]

According to one aspect of the present invention, there is provided a grinding wheel having an abrasive layer provided on an outer periphery of a base, wherein the base has a balance weight attached thereto. A grinding wheel is provided in which a plurality of mounting portions are formed in a circumferential direction at predetermined angular intervals around a rotation axis of the grinding wheel.

According to another aspect of the present invention to achieve the above object, a grinding wheel mounted directly or via a flange on a grinding wheel shaft of a grinding device and a balance during rotation of the grinding wheel are provided. With multiple balance weights of
The grinding wheel is configured to include a base and an abrasive layer provided on an outer periphery of the base, and the base includes a plurality of mounting portions for mounting the balance weight. A grinding wheel set is provided, which is formed in a circumferential direction at a predetermined angular interval around an axis.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a grinding wheel 10 according to the present embodiment includes a metal base 2 formed in an annular shape and a base 2.
And the abrasive grain layer 3 provided on the outer periphery of the base material 2, and the base 2 and the abrasive grain layer 3 are in an integrated state. When the base 2 is formed of a metal material, the strength is significantly improved as compared with a conventional grinding wheel (see FIG. 3) in which the same portion is formed of a grinding stone.

The base 2 is provided with a plurality of female screws 5 into which a male threaded balance weight 4 made of a metal material can be inserted. These internal threads are arranged circumferentially at predetermined angular intervals around the rotation axis of the grinding wheel. This angular interval may be arbitrarily determined according to the size and use of the grinding wheel. If the angle interval is too large, fine balance adjustment becomes difficult.
It is preferable to set it between 10 °. In addition, when the female screw is provided, it is desirable that the pilot hole does not penetrate. This is because the balance weight 4 can be completely fixed to the base 2.

When the grinding operation is actually performed by using the grinding wheel 10, the grinding wheel 10 is mounted on a grinding wheel shaft of a grinding device via, for example, flanges 21 and 22 as shown in FIG. Once the grinding wheel 10 is installed, the balance weight 4
Each time, while changing the mounting position, a dynamic equilibrium tester is used to remove the unbalanced state. Specifically, when the balance weight 4 is fixed to a certain internal thread, the vibration during the rotation of the grinding wheel 10 is detected by the dynamic equilibrium tester, and the position of the unbalanced weight is determined. If the indexed position is, for example, 10 ° in the rotational direction from the position of the balance weight 4 attached earlier, another balance weight 4 is fixed to the female screw at that position. These operations are repeated to balance the grinding wheel 10.

According to the grinding wheel 10 of the present embodiment, the internal threads 5 for attaching the balance weight 4 are arranged at regular angular intervals, and the arrangement of the internal threads 5 itself serves as a protractor. Therefore, the work of attaching the balance weight 4 is simplified, and the test using the dynamic balance tester can be efficiently performed.

According to the grinding wheel 10 of the present embodiment, four insertion holes 6 are further formed in the base 2. When the grinding wheel 10 is directly mounted on the grinding wheel shaft,
As shown in FIG. 2, a set screw 7 is inserted into each insertion hole, and the tip is fixed to the end face of the grinding wheel shaft 8. As described above, the grinding wheel 10 of the present embodiment can be mounted on the grinding wheel shaft regardless of the presence or absence of the flange.

[0021]

According to the present invention, since the mounting portions of the balance weights are provided at regular angular intervals, the dynamic balance test can be easily performed.

Further, if the balance weight is formed in a male screw shape and its mounting portion is formed in a female screw shape, the mounting of the balance weight becomes more reliable.

[Brief description of the drawings]

FIG. 1A is a schematic longitudinal sectional view of one embodiment of a grinding wheel according to the present invention. FIG. 1B is a partial front view of an embodiment of the grinding wheel according to the present invention.

FIG. 2 is an explanatory view showing a state where the grinding wheel shown in FIG. 1 is directly fixed to a grinding wheel shaft.

FIG. 3 (a): a schematic longitudinal sectional view of a conventional first type grinding wheel. FIG. 3 (b): Partial front view of a first conventional grinding wheel.

FIG. 4 is a schematic longitudinal sectional view near the center of the grinding wheel shown in FIG.

FIG. 5 is an enlarged view of an unbalance adjustment mechanism of the grinding wheel shown in FIG. 3;

[Explanation of symbols]

1, 8: whetstone shaft, 2: base, 3: abrasive layer, 4: balance weight, 5: female screw, 6: insertion hole, 7:
Set screw 10, 20: Grinding stone, 21, 22: Flange, 23: Grinding stone part, 24: Bolt, 25:
Unbalance correction mechanism

Claims (3)

[Claims] 1. A grinding wheel having an abrasive grain layer provided on the outer periphery of a substrate, wherein the substrate has a plurality of mounting portions for mounting a balance weight, wherein the mounting portion has a predetermined angle about a rotation axis of the grinding wheel. A grinding wheel formed in the circumferential direction at intervals. 2. A grinding wheel mounted directly or via a flange on a grinding wheel shaft of a grinding device, and a plurality of balance weights for balancing the rotation of the grinding wheel. A plurality of attachment portions for attaching the balance weight to the substrate, wherein a plurality of attachment portions for attaching the balance weight are predetermined around a rotation axis of the grinding wheel. A grinding wheel set characterized by being formed circumferentially at angular intervals. 3. The grinding wheel set according to claim 2, wherein the balance weight is a threaded member having a predetermined weight, and the mounting portion is an internal thread into which the balance weight is inserted. A grinding wheel set characterized by the following: