JP6530692B2 - Grinding wheel fixing device and desorption method of grinding wheel - Google Patents

Description

  The present invention relates to a grinding wheel fixing device for fixing a grinding wheel to a spindle and a method of detaching the grinding wheel, and more particularly to an improvement of the grinding wheel demounting structure.

  Conventionally, as shown in FIG. 3, for example, a stationary flange 103 is provided on a spindle head 102 incorporating an automatic balancing device 105, and the movable flange 106 grinds the grinding wheel 110 with the grinding wheel 110 fitted in the stationary flange 103. The fixing device 101 of the grinding wheel which clamps the both end surfaces of is known (for example, refer to patent documents 1). In general, the grinding wheel 110 is configured to sandwich flat axial end faces in order to prevent cracking.

Japanese Patent Application Laid-Open No. 60-180768

  In the case of a large-diameter grinding wheel, automatic replacement usually results in a large size of the device, so replacement is usually performed manually. In addition, the automatically replaceable spindle head has a problem that the structure is complicated and the cost is increased.

  As shown in FIG. 3, when the automatic balancing device 105 of the grinding wheel 110 is built in the spindle head 102, the clamping mechanism and the installation position of the automatic balancing device 105 overlap. Therefore, as shown in FIG. 4, there are many cases where both are balanced by replacing the automatic balancing device 105 together. However, the automatic balancing device 105 is required for each grinding wheel 110, which is very costly.

  Further, as described above, in the state where the large-diameter grinding wheel 110, the immovable flange 103 and the automatic balancing device 105 are attached, there is a problem that the mass is large and the automatic exchange device itself becomes large.

  In addition, as shown in FIG. 5, the operator manually removes the nut 109 for fixing the automatic balancing device 105 and replaces the grinding wheel 110 together with the movable flange 106 leaving the automatic balancing device 105. There is a need. In that case, when the movable flange 106 and the grinding wheel 110 are removed, the mass is large and the burden on the manual operation becomes large. Furthermore, since it is necessary to have a plurality of movable flanges 106, a large storage shelf therefor is required, and there is a problem that the factory space is occupied.

  As shown in FIG. 6, if the clamping bolt 107 is loosened and the movable flange 106 is removed, the grinding wheel 110 may be removed in some cases, but also in this case the mass of the grinding wheel 110 is large and the burden on the operator is increased. .

  The present invention has been made in view of such a point, and the purpose of the present invention is that the large-diameter grinding wheel can be easily replaced automatically, there is no need to increase the size of the device, and the automatic balancing device is also a spindle head. The purpose is to replace only the grinding wheel and the flange cover while keeping the built-in.

  In order to achieve the above object, in the present invention, the grinding wheel can also be replaced if only the flange cover is removed.

Specifically, the grinding wheel fixing device of the first invention is
A grinding wheel with a grinding wheel through hole at the center,
A grindstone flange inserted into the grindstone through hole and having a tip small diameter portion having an outer diameter smaller than the inner diameter of the grindstone through hole at the tip end side;
A spindle head having a tip end fitted to the grinding wheel flange and rotatable with the grinding wheel flange;
A flange cover having a movable flange sandwiching portion sandwiching the outer periphery of the tip small diameter portion of the grinding wheel flange and clamping and fixing the grinding wheel in cooperation with the grinding wheel flange.

  The movable flange sandwiching portion of the flange cover has an operating portion projecting to the side opposite to the grinding wheel, and the operating portion is sandwiched to expand the inner diameter, thereby releasing the connection with the small diameter portion at the tip. The flange cover is configured to be detachable from the grinding wheel flange together with the grinding wheel in a state in which the operation portion is held.

  According to the above configuration, the flange cover and the grinding wheel flange can be released by sandwiching the operation portion to widen the inner diameter, and the grinding wheel and the flange cover can be removed, so the flange cover is left on the spindle head The grinding wheel can be replaced as it is, and the replacement work becomes easy. In addition, since the grinding wheel and the flange cover can be detached from each other in a state in which the operation part of the flange cover is held by the robot arm, it is not necessary to manually lift the grinding wheel having a large mass, and the workability is significantly improved.

In the second invention, in the first invention,
The flange cover incorporates a push pin that protrudes radially outward when the operation portion is pinched and can press the inner surface of the grindstone through hole.

  According to the above configuration, when the operation portion is held, the push pin is protruded radially outward to press the grinding wheel from the inner surface, thereby improving the bonding strength between the flange cover and the grinding wheel. The car can be detached with the flange cover.

In the third invention, in the first or second invention,
The spindle head is configured so as to be detachable from an automatic balancing device that automatically suppresses the vibration caused by the grinding wheel.
The flange cover is configured to be removable together with the grinding wheel while the automatic balancing device is fixed to the tip of the spindle head.

  According to the above configuration, since the automatic balancing device can be fixed to the spindle head when the grinding wheel is detached, there is no need to prepare an automatic balancing device for each grinding wheel, which has a cost advantage, The overall mass of time is reduced.

The method for detaching a grinding wheel according to the fourth invention is
A grinding wheel flange is fixed to the tip of the spindle head, and the grinding wheel through hole at the center of the grinding wheel is inserted into the grinding wheel flange, and the small diameter portion of the grinding wheel flange is pinched by the movable flange holding portion of the flange cover Grinding wheel fixing process to fix,
The operating portion projecting to the side opposite to the grinding wheel of the flange cover is held by the robot arm and the movable flange holding portion is expanded, thereby holding the operating portion and the flange cover together with the grinding wheel And removing from.

  According to the above configuration, the grinding wheel and the flange cover can be removed by sandwiching the operation part of the flange cover with the robot arm and expanding the movable flange holding part to release the connection with the grinding wheel flange part. The grinding wheel can be replaced while leaving the cover on the spindle head, and the replacement work is simplified. For this reason, it is not necessary to manually lift the grinding wheel having a large mass, so that automatic removal is possible, and the workability and safety are significantly improved.

  As described above, according to the present invention, the grinding wheel and the flange cover are removed from the grinding wheel flange in a state in which the operation part projecting to the side opposite to the grinding wheel of the flange cover is held. The car can be easily replaced automatically, the apparatus does not have to be enlarged, and only the grinding wheel and the flange cover can be replaced while the automatic balancing apparatus is built in the spindle head.

It is a sectional view showing a grinding wheel fixing device concerning an embodiment of the present invention. It is sectional drawing which shows the process of removing a grinding wheel with a robot arm. It is sectional drawing which shows the conventional grinding wheel fixing device. In the conventional grinding wheel fixing device, it is a sectional view showing a situation where the grinding wheel is removed together with the automatic balancing device and the grinding wheel flange. In the conventional grinding wheel fixing device, it is a sectional view showing a situation where the grinding wheel is removed together with the grinding wheel flange. In the conventional grinding wheel fixing device, after removing the flange cover, it is a sectional view showing a situation that the grinding wheel is removed alone.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

  FIG. 1 shows a grinding wheel fixing device 1 according to an embodiment of the present invention. The grinding wheel fixing device 1 can change its position with respect to a workpiece to be ground (not shown) and can freely change its rotational speed. A spindle head 2 is provided. A grinding wheel flange 3 for attaching the grinding wheel 10 can be fixed to a tip end portion 2 a of the spindle head 2 with a flange fixing bolt 4. The outer periphery of the grinding wheel flange 3 is inserted into the grinding wheel through hole 10 a at the center of the grinding wheel 10. An automatic balancing device 5 capable of automatically suppressing vibration at the time of rotation of the grinding wheel 10 is detachable at the front end portion 2 a of the spindle head 2. In the present embodiment, the outer diameter of the automatic balancing device 5 is smaller than the inner diameter of the grinding wheel flange 3. Further, the automatic balancing device 5 can be fixed to the front end portion 2 a of the spindle head 2 by fastening the mounting nut 9 with a nut fastening bolt 9 a.

  The grinding wheel fixing device 1 sandwiches the outer periphery of the tip small diameter portion 3a in a state where the grinding wheel 10 is inserted into the grinding wheel flange 3, and holds the movable wheel 10 in cooperation with the grinding wheel flange 3 The flange cover 6 having the portion 7 is provided. The flange cover 6 is connected to the tip small diameter portion 3 a by the tightening force of the movable flange holding portion 7 unlike fixing to the grindstone flange using a bolt as in the prior art. The clamping force may be, for example, about 8000N.

  The movable flange holding portion 7 has an outer tapered surface 7a such that the inner diameter slightly decreases toward the spindle head 2 side. The outer periphery of the tip small diameter portion 3a also has an inner tapered surface 3b whose outer diameter gradually decreases toward the spindle head 2 so as to correspond to the outer tapered surface 7a. Workpiece grinding is possible by the grinding wheel 10 being rotated by the spindle head 2 while pressing the both axial end faces of the grinding wheel 10 by the outer tapered surface 7a tightening the inner taper surface 3b with a predetermined pressure. It has become.

  The movable flange holding portion 7 having the outer tapered surface 7 a has a ring-shaped (cylindrical) operation portion 7 b projecting to the side opposite to the grinding wheel 10, and the operation portion 7 b is a movable claw 51 of the robot arm 50. As a result, the inner diameter of the outer tapered surface 7a is expanded and the connection with the inner tapered surface 3b of the tip small diameter portion 3a is released. The movable flange holding portion 7 is connected to a cover main body 6 a of which the outer periphery of the flange cover 6 is in contact with the grinding wheel 10 via an annular connecting portion 7 c. The flange cover 6 is formed so as to expand the inside diameter of the outer tapered surface 7a with the connecting portion 7c as a boundary by sandwiching the cylindrical operation portion 7b so as to reduce the inside diameter. Thus, the movable flange holding portion 7 is configured to be able to tighten the tip small diameter portion 3a with an appropriate force, and to expand the inner diameter of the outer tapered surface 7a simply by operating the operation portion 7b. Need to Then, in a state in which the operation portion 7 b is held by the movable claws 51 of the robot arm 50, it is detachable from the grinding wheel flange 3 together with the grinding wheel 10.

  Further, when the operation portion 7b is sandwiched by the cover main body 6a of the flange cover 6, it projects outward in the radial direction of the operation portion 7b (radially outside of the cover main body 6a) to press the inner surface of the grinding wheel 10 The push pin 8 is incorporated. Although the number of push pins 8 is not particularly limited, at least two or more are provided at appropriate intervals.

  When the operator removes the flange cover 6 and the grinding wheel 10 by grasping the operation portion 7 b, the automatic balancing device 5 remains fixed to the tip 2 a of the spindle head 2.

-Desorption method of grinding wheel-
Next, a method of detaching the grinding wheel 10 using the grinding wheel fixing device 1 according to the present embodiment will be described.

  First, the procedure for removing the grinding wheel 10 together with the flange cover 6 (grinding wheel removal step) will be described.

  As shown in FIG. 1, in the state where the grinding wheel 10 is fixed to the spindle head 2 together with the automatic balancing device 5, the outer tapered surface 7a of the movable flange holding portion 7 clamps the inner tapered surface 3b with a predetermined tightening force. The axially opposite sides of the grinding wheel 10 are tightened by the flange cover 6 and the grinding wheel flange 3. Since the axial direction both end surfaces of the grinding wheel 10 are tightened and fixed, the grinding wheel 10 is hard to be broken at the time of tightening.

  Then, when replacing the grinding wheel 10, as shown in FIG. 2, the movable claws 51 of the robot arm 50 sandwich the operation part 7b.

  Then, the movable flange holding portion 7 is deformed so that at least a part of the outer tapered surface 7a is expanded at the connecting portion 7c. At that time, the push pin 8 is pushed in and moved radially outward, and the inner surface of the grindstone through hole 10a is pressed. As a result, the connection between the outer tapered surface 7a of the movable flange holding portion 7 and the inner tapered surface 3b of the grinding wheel flange 3 is released, and the flange cover 6 and the grinding wheel 10 are connected.

  Then, when the robot arm 50 is moved in the direction away from the spindle head 2, the flange cover 6 is removed from the spindle head 2 together with the grinding wheel 10.

  Next, the robot arm 50 moves the grinding wheel 10 together with the flange cover 6 to the position of the grinding wheel shelf (not shown), opens the movable claws 51, and returns the grinding wheel 10 to the predetermined position of the grinding wheel shelf.

  Next, in the grinding wheel fixing step, the operation part 7b of the flange cover 6 preset to the grinding wheel 1 to be replaced is sandwiched by the movable claws 51, and the automatic balancing device 5 and the flange cover 6 remain fixed. It is moved to the tip 2 a of the spindle head 2. If the grinding wheel 10 can be replaced while the movable claws 51 hold the flange cover 6, it is not necessary to prepare a large number of flange covers 6 and it is not necessary to secure a space for the grinding wheel shelf for that. .

  Then, the outer tapered surface 7a is moved so as to be inserted into the inner tapered surface 3b, and the movable claw 51 is released.

  Then, the grinding wheel 10 is fixed as shown in FIG.

  As described above, the grinding wheel 10 and the flange cover 6 are removed by sandwiching the operation part 7b of the flange cover 6 with the robot arm 50 and expanding the movable flange holding part 7 to release the connection with the grindstone flange 3 part. As a result, the grinding wheel 10 can be replaced while leaving the flange cover 6 on the spindle head 2, and the replacement work is simplified. For this reason, it is not necessary to manually lift the grinding wheel 10 having a large mass, and automatic detachment is also possible, and the workability and safety are significantly improved.

  In addition, when the operation portion 7b is held, the push pin 8 is protruded outward in the radial direction to press the grinding wheel 10 from the inner surface, so that the bonding strength between the flange cover 6 and the grinding wheel 10 is improved. The grinding wheel 10 can be removed together with the flange cover 6.

  Furthermore, since the automatic balancing device 5 can be fixed to the spindle head 2 when the grinding wheel 10 is attached and detached, there is no need to prepare the automatic balancing device 5 for each grinding wheel 10, which has a cost advantage. The overall mass at desorption is reduced.

  Therefore, according to the grinding wheel fixing device 1 according to the present embodiment, the flange cover 6 is removed from the grinding wheel flange 3 together with the grinding wheel 10 in a state in which the operation portion 7b projecting to the opposite side to the grinding wheel 10 of the flange cover 6 is held. The large-diameter grinding wheel 10 can be easily replaced automatically, and the device does not need to be upsized, and the automatic balancing device 5 is also incorporated in the spindle head 2 by replacing only the grinding wheel and the flange cover 6 It can be done.

(Other embodiments)
The present invention may be configured as follows for the above embodiment.

  That is, in the above embodiment, the inner surface of the grindstone through hole 10a of the grinding wheel 10 is mechanically pressed using the push pin 8, but the inner surface of the grindstone through hole 10a is pressed using hydraulic force. You may do so.

  In the said embodiment, although the movable flange holding part 7 shall have a cylindrical continuous outer peripheral surface, a part of outer peripheral surface may be parted.

  The above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

  As described above, the present invention is useful for a grinding wheel fixing device for fixing a grinding wheel to a spindle and a method of detaching the grinding wheel.

1 Grinding wheel fixing device
2 spindle head
2a tip
3 Wheel flange
3a Tip small diameter part
3b inner tapered surface
4 Flange fixing bolt
5 Automatic Balancer
6 Flange cover
6a Cover body
7 Movable flange clamping part
7a Outer tapered surface
7b Operation unit
7c connecting part
8 push pin
9 Mounting nut
9a nut fastening bolt
10 grinding wheel
10a grinding wheel through hole

Claims (4)

A grinding wheel with a grinding wheel through hole at the center,
A grindstone flange inserted into the grindstone through hole and having a tip small diameter portion having an outer diameter smaller than the inner diameter of the grindstone through hole at the tip end side;
A spindle head having a tip end fitted to the grinding wheel flange and rotatable with the grinding wheel flange;
A flange cover having a movable flange sandwiching portion sandwiching the outer periphery of the tip small diameter portion of the grindstone flange and sandwiching and fixing the grindstone wheel in cooperation with the grindstone flange;
The movable flange sandwiching portion of the flange cover has an operating portion projecting to the side opposite to the grinding wheel, and the operating portion is sandwiched to expand the inner diameter, whereby the connection with the tip small diameter portion is released. A grinding wheel fixing device characterized in that the flange cover is configured to be detachable from the grinding wheel flange together with the grinding wheel in a state in which the operation unit is held. In the grinding wheel fixing device according to claim 1,
The grinding wheel fixing device is characterized in that the flange cover incorporates a push pin that protrudes radially outward when the operation portion is pinched and can press the inner surface of the grindstone through hole. In the grinding wheel fixing device according to claim 1 or 2,
The spindle head is configured so as to be detachable from an automatic balancing device that automatically suppresses the vibration caused by the grinding wheel.
A grinding wheel fixing device characterized in that the flange cover is configured to be removable along with the grinding wheel while the automatic balancing device is fixed to the tip of the spindle head. A grinding wheel flange is fixed to the tip of the spindle head, and the grinding wheel through hole at the center of the grinding wheel is inserted into the grinding wheel flange, and the small diameter portion of the grinding wheel flange is pinched by the movable flange holding portion of the flange cover Grinding wheel fixing process to fix,
The operating portion projecting to the side opposite to the grinding wheel of the flange cover is held by the robot arm and the movable flange holding portion is expanded, thereby holding the operating portion and the flange cover together with the grinding wheel And removing the grinding wheel from the grinding wheel.

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