JPH0647663A - Holding device of grinding wheel - Google Patents

Abstract

(57) [Abstract] [Purpose] The supporting rigidity of the grindstone can be effectively secured and the size can be reduced, and the work for attaching and detaching the grindstone can be easily simplified and made more efficient. Enables easy position adjustment corresponding to the part to be processed. [Structure] Grindstone holding portion 14 capable of fixing the grindstone 12 to the outer peripheral surface
With a tapered hole portion 16 and a spline hole portion 18 at both ends.
And a grindstone shaft 20 provided with and a spline hole portion 18
A drive mechanism 24 having a spline shaft 22 that engages with
A first fluid bearing 26 that rotatably supports the grindstone shaft 20.
And a tapered shaft portion 28 that fits into the tapered hole portion 16
An auxiliary shaft 30 having a fixing mechanism 32 for coaxially fixing the auxiliary shaft 30 to the grindstone shaft 20, and the auxiliary shaft 30.
A second fluid bearing 34 that rotatably supports the auxiliary shaft 30 and a moving mechanism 36 that can move the auxiliary shaft 30 forward and backward in the arrow Y direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel supporting device for performing grinding by rotating a grinding wheel while supporting it from both sides.

[0002]

2. Description of the Related Art For example, in the case of grinding a shaft member, the shaft member is rotated, and the grindstone being driven to rotate and the shaft member are relatively moved, so that A grinding machine that performs grinding is generally known.

In the above-mentioned grinder, the supporting device for rotating the grindstone usually has a rotary drive source connected to one end of the grindstone shaft and a grindstone fixed to the other end of the grindstone shaft. There is. Therefore, the grindstone is supported in a cantilever manner, and a grindstone shaft having a considerably large diameter is used to effectively secure the support rigidity of the grindstone. Therefore, since the grindstone shaft itself has a large diameter, the bearing for rotatably supporting the grindstone shaft also has a considerably large diameter, which causes a problem that the entire supporting device becomes large.

In view of this, there has been proposed a supporting device constructed so that the grindstone is supported by a fixed shaft through a bearing and fixed to the mounting base by both supports (Japanese Patent Laid-Open No. 59-16126).
(See Japanese Patent Publication No. 5). As a result, the grindstone can be supported on both sides, and even with a grindstone shaft having a relatively small diameter, the supporting rigidity of the grindstone can be effectively improved.

[0005]

However, in the above-mentioned prior art, when the grindstone is exchanged, the fixed shaft supporting the grindstone via the bearing is removed from the mounting base,
It is necessary to remove the grindstone from the fixed shaft. Therefore, it has been pointed out that the work of attaching and detaching the grindstone is complicated and time-consuming, and the efficiency of the entire grinding process cannot be easily achieved. In addition, when grinding a shaft member having a plurality of processed parts in the axial direction, the processed parts of the shaft member and the grindstone must be sequentially adjusted in relative position, and this kind of position adjustment work is required. It is complicated.

The present invention is to solve this kind of problem, and it is possible to effectively secure the support rigidity of the grindstone and downsize it, and also to easily and simply attach and detach the grindstone. It is an object of the present invention to provide a supporting device for a grinding wheel which is capable of easily adjusting the position of the grinding wheel in correspondence with a portion to be processed.

[0007]

In order to achieve the above object, the present invention has a grindstone holding portion capable of fixing a grindstone on the outer peripheral surface thereof, and a tapered hole portion is formed at one end on the grindstone attaching / detaching side. A grinding wheel shaft, a drive mechanism that is spline-engaged with the other end portion opposite to the one end portion of the grinding wheel shaft to drive the grinding wheel shaft to rotate, and a bearing that rotatably supports the grinding wheel shaft, An auxiliary shaft having a tapered shaft portion that fits into the tapered hole portion of the grindstone shaft, and for fixing the auxiliary shaft coaxially to the grindstone shaft while the tapered shaft portion is fitted into the tapered hole portion The fixing mechanism, the bearing for rotatably supporting the auxiliary shaft, and the moving mechanism for integrally moving the auxiliary shaft with the grindstone shaft in the axial direction of the grindstone.

[0008]

In the supporting apparatus for the grinding wheel according to the present invention, the grindstone fixed to the grindstone holding portion of the grindstone shaft is rotatably driven while being supported by the grindstone shaft and the auxiliary shaft via bearings. Therefore, even if the diameters of the grindstone shaft and the auxiliary shaft are set to be relatively small, the support rigidity of the grindstone can be effectively ensured, and the size of the entire supporting device can be reduced. further,
By simply detaching the auxiliary shaft from the grindstone shaft through the fixing mechanism, the grindstone can be removed from the grindstone holding portion of the grindstone shaft, and the work for attaching and detaching the grindstone can be performed quickly and easily.

Moreover, the auxiliary shaft and the grindstone shaft are integrally moved in the axial direction of the grindstone under the action of the moving mechanism, so that the position adjustment work of the grindstone can be performed quickly and easily. At that time, the grindstone shaft and the drive mechanism are spline-engaged, and even if the grindstone moves axially through the grindstone shaft and the auxiliary shaft, the grindstone shaft is reliably rotated under the action of the drive mechanism. It becomes possible to drive.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A grinding wheel supporting device according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 3, reference numeral 10 indicates
3 shows a supporting device according to the present embodiment. This support device 10
Having a grindstone holding portion 14 capable of fixing the grindstone 12 on the outer peripheral surface,
A grindstone shaft 20 having a tapered hole portion 16 formed at one end portion on the grindstone attachment / detachment side and a spline hole portion 18 provided at the other end portion opposite to the one end portion, and a spline hole portion of the grindstone shaft 20. A drive mechanism 24 that has a spline shaft 22 that engages with 18 and that rotationally drives the grindstone shaft 20, a first fluid bearing 26 that rotatably supports the grindstone shaft 20, and a tapered hole portion of the grindstone shaft 20. Tapered shaft part 2 that fits in 16
8 and the tapered shaft portion 28 fitted in the tapered hole portion 16, the auxiliary shaft 3 is attached to the grindstone shaft 20.
A fixing mechanism 32 for coaxially fixing 0, a second fluid bearing 34 for rotatably supporting the auxiliary shaft 30, and the auxiliary shaft 30 integrally with the grindstone shaft 20 in the axial direction of the grindstone 12. And a moving mechanism 36 that can move back and forth.

On the base 38 which constitutes the supporting device 10,
Guide rails 40a and 40b and a motor 42 are provided extending in the direction of arrow X, and the guide rails 40a and 40b are provided.
The device main body 43 is arranged so as to be movable back and forth in the direction of the arrow X, and the ball screw 44 connected to the rotation shaft of the motor 42 is screwed into the device main body 43. The motor 4 that constitutes the drive mechanism 24 on the upper end side of the device main body 43
6 is fixed, and the spline shaft 22 is connected to a rotary shaft 48 extending from the motor 46 via a coupling 50.

The grindstone holding portion 14 of the grindstone shaft 20 has the grindstone 12
Has a flange portion 52 that engages with one side surface of
A fixing nut 56 is screwed into a screw portion 54 formed on the outer circumference of the whetstone attachment / detachment side end portion, and the fixing nut 56 and the flange portion 5
Both sides of the grindstone 12 are held by 2 and.

A large diameter portion 58 is provided on one end side of the auxiliary shaft 30, and the tapered shaft portion 28 extends coaxially from the large diameter portion 58. The fixing mechanism 32 is a substantially ring-shaped fastening nut 6
The fastening nut 60 includes a protrusion 62 that engages with the large diameter portion 58 of the auxiliary shaft 30 and a screw portion 54 of the grindstone shaft 20.
And a thread groove 64 that is screwed into.

A hole 66 is formed on the other end of the auxiliary shaft 30, and a moving mechanism 36 is arranged on the other end.
The moving mechanism 36 includes a casing 68 fixed to the apparatus body 43, and the motor 7 is attached to an end portion of the casing 68.
0 is fixed. A screw shaft 72 connected to the rotation shaft of the motor 70 is screwed into a screw hole 76 formed in a side portion of a substantially cylindrical moving housing 74. A bearing 77 is provided in the moving housing 74.
While the auxiliary shaft 30 is engaged rotatably and movably integrally in the axial direction via the guide groove 78 formed in the outer peripheral portion of the moving casing 74 in the axial direction, the casing 6
The locking member 80 fixed to the inner wall portion of 8 is fitted.

The first and second fluid bearings 26 and 34 are arranged in the main body 43 of the apparatus, and an opening is provided between the first fluid bearing 26 and the second fluid bearing 34 to place the grindstone 12. The portion 82 is formed, and the first fluid bearing 26 is formed.
The separation distance between the second fluid bearing 34 and the second fluid bearing 34 is set to a distance at which the grindstone 12 can be attached to and detached from the grindstone holding portion 14 of the grindstone shaft 20 in a state where the auxiliary shaft 30 is separated from the grindstone shaft 20. (See Figure 4).

A work holding device 90 is arranged in the vicinity of the supporting device 10 thus constructed. 2 and 3
As shown in FIG. 3, the work holding device 90 includes a center support mechanism 94 that rotatably supports both ends of a cam shaft 92 that is a shaft member, and both sides of a grindstone 12 that has a rotation axis parallel to the axis of the cam shaft 92. First and second rotation transmission mechanisms 98, 100 capable of rotating the cam shaft 92 by gripping the outer peripheral portion of the cam shaft 92 in the vicinity of the portion.
The first and second rotation transmission mechanisms 98 and 100 are provided with a rotation drive mechanism 102 that applies a rotational force.

The center support mechanism 94 is used for the fixed frame 10.
The motor 106 and the cylinder 108 fixed to the motors 4a and 104b are provided. By driving the motor 106 and the cylinder 108, the cam shaft 92 is supported in the axial direction (arrow Y direction) with both ends thereof supported. Move back and forth.

First and second rotation transmission mechanisms 98, 100
Includes a rotary hollow main shaft 112 that is disposed in the housing 110 and is driven to rotate. Under the action of a plurality of cylinder portions (not shown) provided on the rotary hollow main shaft 112, the plurality of rods 114 are connected to the camshaft 92. Then, the cam shaft 92 is advanced and retreated toward the axis center of the cam shaft 92, and the outer peripheral portion of the cam shaft 92 is gripped (see FIG. 3). The gear part 1 is provided on the outer peripheral part of the rotary hollow main shaft 112.
16 is formed, and the rotation driving mechanism 10 is formed in the gear portion 116.
The idle gear 118, which constitutes No. 2, meshes. Each of the idle gears 118 is integrally attached to the same rotary shaft, and one of the idle gears 118 is connected to the motor 1.
It meshes with a gear 122 pivotally mounted on the gear 20.

Next, the supporting device 10 constructed as described above.
The operation will be described in relation to the work holding device 90.

First, both ends of the cam shaft 92 are supported by the center support mechanism 94, and the first and second rotation transmission mechanisms 98, 100 are driven to drive the plurality of rods 114.
As a result, a predetermined outer peripheral portion of the cam shaft 92 is gripped. The motor 12 that constitutes the rotary drive mechanism 102
0 is driven to rotate the gear 122, the gear 1
One idle gear 118 meshing with 22 rotates, and the other idle gear 118 also rotates integrally. Therefore, the first and second rotation transmission mechanisms 98, 1 are provided via the gear portion 116 that meshes with the respective idle gears 118.
The rotary hollow main shaft 112, which constitutes 00, is rotated, and the cam shaft 92 is rotationally driven.

In this state, the drive mechanism 24 of the supporting device 10
When the motor 46 constituting the above is driven and the spline shaft 22 is rotated via the coupling 50, the grindstone shaft 20 is rotated via the spline hole portion 18 into which the spline shaft 22 is fitted. Therefore, the whetstone 12 fixed to the whetstone holding portion 14 of the whetstone shaft 20 is rotationally driven in a predetermined direction. Then, by controlling the drive of the motor 42, the rotationally driven grindstone 12 moves back and forth in the direction of the arrow X to grind a desired cam of the camshaft 92.

Next, in this embodiment, the camshaft 92
While supporting both ends of the center support mechanism 94,
By moving the grindstone 12 in the axial direction of the cam shaft 92, it is possible to efficiently and easily perform the grinding process on the plurality of cams of the cam shaft 92.
That is, when the screw shaft 72 is rotated in a predetermined direction under the driving action of the motor 70 that constitutes the moving mechanism 36, the moving housing 7 in which the screw hole 76 into which the screw shaft 72 is fitted is formed.
4 moves in the axial direction of the auxiliary shaft 30 (direction of arrow Y) under the guiding action of the guide groove 78 and the locking member 80. Then, the auxiliary shaft 3 rotatably held in the moving casing 74
0 moves in the arrow Y direction integrally with the moving housing 74, and the grindstone shaft 20 connected to the auxiliary shaft 30 via the fixing mechanism 32 moves in the arrow Y direction integrally with the grindstone 12. To do. At that time, the spline hole portion 18 of the grindstone shaft 20
The spline shaft 22 is fitted to the. Therefore, even if the grindstone shaft 20 moves in the direction of the arrow Y, the spline engagement state between the grindstone shaft 20 and the drive mechanism 24 can be ensured, and even if the grindstone shaft 20 expands due to heat generation, Stretch the spline hole 18 and the spline shaft 22
It becomes possible to absorb at the engaging part with.

Therefore, the grindstone 12 can be moved easily and quickly in the axial direction of the cam shaft 92 (direction of arrow Y) under the action of the moving mechanism 36, and is particularly provided adjacent to the cam shaft 92. Further, it is possible to obtain the effect that the grinding of the plurality of cams can be efficiently performed.

Further, according to this embodiment, one end side of the grindstone shaft 20 for fixing the grindstone 12 is supported by the first fluid bearing 26 and the auxiliary shaft 30 connected to the grindstone shaft 20.
Are supported by the second fluid bearing 34. Therefore, the grindstone 12 is substantially supported on both sides by the first and second fluid bearings 26 and 34, and the supporting rigidity of the grindstone 12 is effective even if the diameters of the grindstone shaft 20 and the auxiliary shaft 30 are set small. Can be secured. Moreover, in order to support the grindstone shaft 20 and the auxiliary shaft 30, the first and second fluid bearings 26, 3
4 is used, and the first and second fluid bearings 2
The diameters of 6 and 34 are smaller than those of ordinary bearings.

For this reason, the apparatus main body 43 can be easily downsized, and in particular, like the work holding apparatus 90, the first and second rotation transmission mechanisms 98 and 100 surround the cam shaft 92 to support the apparatus. Even with the structure projecting to the 10 side, it is possible to reliably prevent the device main body 43 from interfering with the first and second rotation transmission mechanisms 98 and 100. Further, by using the first and second fluid bearings 26 and 34, the centripetal property of the grindstone shaft 20 and the auxiliary shaft 30 at the time of rotation can be maintained and the grindstone 12 can be rotationally driven with high accuracy. There is an advantage that the grindstone shaft 20 and the auxiliary shaft 30 can smoothly move in the arrow Y direction.

Further, when the grindstone 12 is attached / detached, first, the fastening nut 60 constituting the fixing mechanism 32 is screwed, and the grindstone shaft 20 is threaded from the thread groove 64 of the fastening nut 60.
After the threaded portion 54 is detached, the auxiliary shaft 30 is moved in the direction away from the grindstone shaft 20 under the action of the motor 70.
Therefore, the tapered shaft portion 28 of the auxiliary shaft 30 is attached to the grindstone shaft 20.
Of the auxiliary shaft 3 and the fastening nut 60, which is taken out from the tapered hole portion 16 of FIG.
0 separates from the grindstone shaft 20 (see FIG. 4). Next, after the fixing nut 56 is screwed and the fixing nut 56 is removed from the thread portion 54 of the grindstone shaft 20, the grindstone 12
Is separated from the grindstone holding portion 14 (see the chain double-dashed line in FIG. 4). Then, with the new grindstone 12 arranged in the grindstone holding portion 14 and held by the flange portion 52 and the fixing nut 56, the auxiliary shaft 30 is moved to the grindstone shaft 20 side and tapered in the tapered hole portion 16. The shaft portion 28 is fitted. further,
When the fastening nut 60 is screwed, the protrusion 62 of the fastening nut 60 presses the large diameter portion 58 of the auxiliary shaft 30 in the axial direction of the grindstone shaft 20, and the tapered shaft portion 28 is tapered.
The auxiliary shaft 30 is coaxially and firmly fixed to the grindstone shaft 20.

Thus, according to this embodiment, the auxiliary shaft 30
It is possible to remove the grindstone 12 from the grindstone shaft 20 within the opening 82 of the apparatus body 43 simply by detaching the grindstone from the grindstone shaft 20. For this reason, an effect is obtained that the work of attaching and detaching the grindstone 12 can be performed easily and quickly at once.

[0029]

According to the grinding wheel supporting device of the present invention,
The following effects or advantages can be obtained.

The grindstone fixed to the grindstone holding portion of the grindstone shaft is
Since both ends are held by the grindstone shaft and the auxiliary shaft supported by the bearings, respectively, even if the diameters of the grindstone shaft and the auxiliary shaft are set to relatively small diameters, the supporting rigidity of the grindstone can be effectively ensured. The size of the entire supporting device can be reduced. Furthermore, the whetstone can be removed from the whetstone holding portion of the whetstone shaft only by detaching the auxiliary shaft from the whetstone shaft via the fixing mechanism, and the whetstone attachment / detachment work can be performed quickly and easily. Moreover, the whetstone can be moved in the axial direction via the auxiliary shaft and the whetstone shaft under the action of the moving mechanism, and the whetstone can be quickly and easily adjusted in position corresponding to a plurality of processing parts of the workpiece. You can

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view of a support device for a grinding wheel according to the present invention.

FIG. 2 is a schematic side view illustrating the supporting device.

FIG. 3 is a schematic plan view of the supporting device and the work holding device.

FIG. 4 is an explanatory diagram when a shaft member is replaced in the support device.

[Explanation of symbols]

 10 ... Supporting device 12 ... Whetstone 14 ... Whetstone holding part 16 ... Tapered hole part 18 ... Spline hole part 20 ... Whetstone shaft 22 ... Spline shaft 24 ... Drive mechanism 26 ... First fluid bearing 30 ... Auxiliary shaft 32 ... Fixing mechanism 34 ... second fluid bearing 36 ... moving mechanism 43 ... apparatus body 56 ... fixing nut 60 ... fastening nut 70 ... motor 72 ... screw shaft 74 ... moving casing 80 ... locking member 90 ... work holding device

Claims (3)

[Claims] 1. A grindstone shaft having a grindstone holding portion capable of fixing a grindstone on an outer peripheral surface thereof, and a tapered hole portion formed at one end on the grindstone mounting / dismounting side, and the one end of the grindstone shaft opposite to the other. A drive mechanism that is spline-engaged with the other end to rotationally drive the grindstone shaft, a bearing that rotatably supports the grindstone shaft, and a tapered shaft portion that fits into a tapered hole portion of the grindstone shaft. An auxiliary shaft, a fixing mechanism for coaxially fixing the auxiliary shaft to the grindstone shaft in a state where the tapered shaft portion is fitted in the tapered hole portion, and a bearing that rotatably supports the auxiliary shaft, A support device for a grinding wheel, comprising: a moving mechanism that moves the auxiliary shaft integrally with the whetstone shaft in the axial direction of the whetstone. 2. The supporting device according to claim 1, wherein a spline hole is provided at the other end of the grindstone shaft, and the drive mechanism includes a spline shaft that engages with the spline hole. Grinding wheel support device. 3. A support device for a grinding wheel according to claim 1, wherein the bearing is a fluid bearing.