JP3084391B2 - Spindle device with automatic wheel changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle device with an automatic grinding wheel changing device, and more particularly, to a spindle device with an automatic grinding wheel changing device capable of automatically changing a grinding wheel.

[0002]

2. Description of the Related Art In a grinding machine, a grindstone causes blinding or clogging due to processing, so that it is necessary to dress the grindstone periodically, thereby reducing the grindstone diameter. When the use of the grindstone is reached, it is necessary to periodically replace the grindstone. Therefore, the grinding machine is provided with an automatic grindstone changing device for automatically changing the grindstone of the grindstone spindle. The whetstone automatic exchanging device attaches the whetstone to the chuck on the whetstone spindle spindle by the operation of its arm.Therefore, in order to automate the exchanging work, it is necessary to devise a method of attaching the whetstone. I was (A) and (B) of FIG. 7 and (A) of FIG.
(B) shows the attachment / detachment part of the grindstone and the chuck in the conventional grinding machine, respectively. In FIG. 7 (A), a male screw portion 14 is formed on a shank 12 of a grindstone 10, and a female screw portion 18 screwed to the male screw portion 14 is formed on a chuck 16 attached to a rotating shaft of a grindstone spindle. I have. Also, a hexagonal wrench hole 20 is provided in the head of the shank 12, and a hexagonal wrench 24 provided at the tip end 22 of the arm of the automatic grinding wheel exchange device is inserted. I have. Whetstone 1 for chuck 16
The hexagonal wrench 24 allows the grindstone 10 to be attached and detached.
Is rotated with respect to the chuck 16.

In FIG. 7B, a sliding member 32 slidable in a radial direction is disposed inside a centrifugal chuck 30 with one end thereof being pulled by a spring 34. The grindstone is attached by inserting the centrifugal chuck 30 into a hole provided at the tip of the shank by the arm of the automatic grindstone changing device. The sliding member 32 includes the centrifugal chuck 30.
Rotates, it moves in the direction of arrow a due to centrifugal force.
Therefore, when the grindstone is attached, the sliding member 32
Presses the inner peripheral surface of the hole in the shank of the whetstone. Thereby, the grindstone is fixed to the centrifugal chuck 30. In the example shown in FIG. 8A, the chuck 40 is
The grindstone 42 is fixed by being press-fitted into the second through hole 44. In the case shown in (B) (collet chuck), a collet 47 is inserted and arranged in a center hole of a cylindrical member 46 provided with a taper 45. Whetstone 48 is collet 4
7, and the collet 47 is pulled by an air cylinder or the like as indicated by an arrow b, whereby the collet 47 is held at a narrow pressure.

[0004]

In the method shown in FIG. 7A, a mechanism for rotating the hexagonal wrench 24 is required for the arm of the automatic grinding wheel changing device, so that the structure of the arm becomes complicated. The automatic grinding wheel changer becomes large. In general, grinding may be performed while the grindstone is reciprocated (oscillation or the like). Therefore, in a grinder, a grindstone spindle is mounted on a reciprocating moving table. For this grindstone spindle moving table,
It is conceivable that the automatic whetstone exchanging device is also mounted and moved integrally, but in the prior art shown in FIG.
When placed on one moving table, an excessive load is applied to the driving system of the moving table, and the movement accuracy of the moving table deteriorates, particularly when reciprocating at high speed. Therefore, in the prior art shown in FIG. 7A, the automatic grinding wheel changing device and the grinding wheel spindle are mounted on different tables. However, in this case, when the whetstone 10 is replaced, NC
The position of each moving table must be controlled using a device (numerical control device), and the position of the grinding wheel spindle spindle and the automatic grinding wheel exchange device must be adjusted.

[0005] In the method shown in FIG. 7B, a rotating mechanism is not required for the arm of the automatic grinding wheel changing device. However, when the sliding member 32 is moved, imbalance may occur during rotation. At the time of stop, the centrifugal force acting on the sliding member 32 becomes small, so that there is a problem that the grindstone is loosened. Further, in the method shown in FIG. 8A, there is a problem that the chuck 40 is welded to the through-hole 44 due to heat at the time of grinding. In the method shown in FIG. Since the portion is cylindrical, the holding force by the collet 47 is weak. Further, since the collet 47 must be constantly pulled during rotation, there is a problem that the grindstone 48 is loosened due to a decrease in pressure of the air cylinder or the like.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to move a grinding wheel spindle spindle with a high degree of movement accuracy, and to prevent the grinding wheel from being loosened or the like without aligning the grinding wheel spindle spindle with an automatic grinding wheel changing device. An object of the present invention is to provide a spindle device with a whetstone automatic changing device capable of reliably performing whetstone change.

[0007]

According to the first aspect of the present invention, there is provided a stocker for storing a plurality of grindstone quills in which a grindstone is integrally fixed and formed with a tapered portion and a step portion for reducing the diameter at the tip end side. A quill holding hole having a tapered portion into which the tapered portion of the whetstone quill is fitted, a rotary shaft formed in the axial direction, and a quill holding hole of the rotary shaft protrudes inward from the inner peripheral surface of the quill holding hole and moves radially. A whetstone spindle having a protruding member capable of being engaged and a quill holding means for pressing the protruding member in the center direction with the whetstone quill inserted into the quill holding hole to engage and hold a step portion of the whetstone quill; Grinding wheel transport means for transporting the grinding wheel quill stored in the stocker, inserting the grinding wheel quill inserted into the quill holding hole of the rotating shaft, removing the inserted grinding wheel quill, and returning the wheel to the stocker; and Together with the wheel spindle spindle and said stocker is placed, it was provided with a moving means for moving integrally with the grinding wheel autochanger with the spindle apparatus to achieve the above purpose.

[0008]

According to the first aspect of the present invention, in the spindle device with the automatic grinding wheel changing device, the grinding wheel transport means transports the grinding wheel quill stored in the stocker and inserts it into the quill holding hole of the rotating shaft. As a result, the tapered portion of the grinding wheel quill fits into the tapered portion of the quill holding hole. The quill holding means presses the projecting member toward the center of the quill holding hole, thereby engaging the projecting member with the step of the inserted grinding quill, and holding the grinding quill. The whetstone conveying means, the whetstone spindle, and the stocker are integrally moved by the moving means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a spindle device with an automatic grinding wheel changing device according to the present invention will be described below in detail with reference to FIGS. 1 to 3 show the overall configuration of a spindle device with an automatic grinding wheel changing device according to the present embodiment. As shown in FIG. 1, a spindle device 50 with an automatic grinding wheel changing device according to the present embodiment, and a grinding wheel shaft spindle 5
2, a stocker 70 in which a plurality of replacement grindstone tools 68 are stored, conveyance of the grindstone tools 68, and a grindstone spindle 5
2 is provided with a grindstone transfer device 54 for attaching the grindstone 2 to the grindstone 2, and a grindstone table 62 which reciprocates by a drive mechanism (not shown) such as a ball screw or a servomotor.

As shown in FIG. 3, the stocker 70 has a disk shape, and is supported by two support plates 64 and 65 fixed on a grindstone table 62. It is mounted on the top so as to be rotatable about a fixed shaft 72 (FIG. 2). The stocker 70 is provided with a tool holding hole 76 over the entire circumference thereof, and the replacement grindstone tool 68 is stored by being inserted into the tool holding hole 76. A lock pin 78 protruding downward is attached to the outer peripheral portion of the stocker 70. Each of the locking pins 78 is provided at a position corresponding to each of the tool holding holes 76 in the same number as that of the tool holding holes 76.

A stocker pitch feed cylinder 82 for moving a movable member 80 having a slanted tip and a stocker positioning cylinder 86 for moving a movable member 84 are fixed on the stocker mounting support plate 66. The stocker positioning cylinder 86 moves the movable member 84 as shown by a two-dot chain line in FIG.
Is brought into contact with the locking pin 78, and the locking pin 78 is sent to the position shown by the dotted line. Also, the stocker pitch feed cylinder 82 moves the movable member 80 from the position indicated by the two-dot chain line to the position indicated by the solid line, so that the locking pin 78 is moved from the position indicated by the dotted line to the position indicated by the solid line. Has become. Thereby, the stocker 7
0 is rotated at a pitch for feeding one tool holding hole 76 in the direction of arrow j in FIG.

The grindstone transfer device 54 includes a turning arm 90 having a gripper 88 for holding a grindstone tool 68 at a tip end thereof;
A rotation drive mechanism 92 for rotating the turning arm 90 as shown by arrows c and d in FIG. 1 is provided. The rotation drive mechanism 92 is fixed to a fixed plate 94.
The unit 4 is moved a predetermined distance in the directions of arrows e and f by a unit forward / reverse cylinder 96. The moving table 98 to which the unit forward / backward moving cylinder 96 is fixed is moved by a unit vertical cylinder 100 (indicated by a dotted line in FIG. 1) fixed to the support plate 65 by a predetermined distance in the directions of arrows g and h. It has become. Therefore, the turning arm 90 is horizontally moved by the unit forward / backward moving cylinder 96 and vertically moved by the unit vertical cylinder 100. In this embodiment, the above-described grindstone transfer device 54 and stocker 70 constitute an automatic grindstone changing device for automatically changing the grindstone tool 68 of the grindstone spindle 52. The position shown by the two-dot chain line in FIG. 1 is the original position of the turning arm 90. The grindstone spindle 52 is fixed on a grindstone table 62 by a grindstone table 102.

FIG. 4 shows the internal structure of the grindstone spindle 52. In the following description, the left side in FIG. First, the structure of the grindstone tool 68 will be described with reference to FIG. The grindstone tool 68 includes a shank 10 on which a cylindrical grindstone 105 is mounted.
6 is integrally fixed to the taper quill 107. The taper quill 107 has a large-diameter portion 107a sandwiched between grippers 88 of the revolving arm 90, and a taper portion 108 having a smaller diameter from the front side to the rear side. The taper quill 107 has a small-diameter portion 107b having the smallest diameter, and a clamping engagement portion 109 having a larger diameter than the small-diameter portion 107b.

Next, the grindstone spindle 52 will be described. The grindstone spindle 52 includes a spindle 52 </ b> A for rotating the rotating shaft 110 and the spindle 5.
And a cylinder portion 52B attached to the rear end of 2A. The rotating shaft 110 of the spindle unit 52A is supported by bearings 53 and 55 and is driven to rotate by a motor 59 disposed on the outer periphery thereof. In the present embodiment, a through hole 112 is formed in the rotating shaft 110 so as to penetrate forward and backward. This through hole 1
A taper 113 having an inclination angle similar to that of the taper portion 108 of the taper quill 107 in the grindstone tool 68 is formed in the opening on the front side of 12. In the state shown in FIG. 4, the grindstone tool 68 is inserted into the through hole 112 such that the taper 113 and the taper portion 108 of the taper quill 107 are fitted. On the right side of the taper 113, an annular recess 111 is formed by increasing the diameter.

A rod member 114 is slidably inserted into the through hole 112. This rod member 114
Are a plurality of (for example, three) rods 1 at the front end.
The quill pushing member 123 is attached to the inside of the quill pushing member 123. Rod 11
The five tip portions 116 each have a substantially spherical shape. The rod 115 is in a state where no external force is applied thereto.
6 are formed farther apart from each other than the state shown in FIG. However, in the state shown in FIG. 4, since the distal end portion 116 is pressed inward by the inner peripheral surface of the through-hole 112, it is in an elastically deformed state (closed state). As shown in FIG. 4, when the grindstone tool 68 is inserted into the through hole 112, the distal end portion 116 is engaged with the locking portion 109 for clamping of the taper quill 107 (hereinafter, this state is referred to as a “clamp state”). ). In addition,
The rear end 117 of the rod member 114 projects rearward from the rear end of the rotating shaft 110.

The rod member 114 has an engaging portion 118 which is in contact with the inner peripheral surface of the through hole 112. A clamp spring 122 whose both ends are locked by locking rings 120 and 121 is disposed between the locking portion 118 and the step portion 119 of the through hole 112. The bar member 114 is urged rearward by the clamp spring 122. Therefore, the tip 116 of the rod member 114 is
The taper quill 107 is clamped and pulled backward, so that the grinding wheel tool 68
It is fixed to 0.

On the other hand, the cylinder part 52B is composed of a piston member 13 having a piston part 132 as a pressure receiving part, and rod parts 130, 131 before and after the piston part 132.
4 is provided. The piston member 134 has a small diameter hole 1 in which the rod portion 130 is provided in the cylinder block 136.
35, a rod portion 131 is provided with a center hole 137 of a closing member 138 for closing a rear end opening of the cylinder block 136.
, Are slidably inserted. Piston part 1
Before and after 32, a first cylinder chamber 140 and a second cylinder chamber 142 are formed by a cylinder block 136 and a closing member 138, respectively. The first cylinder chamber 140 and the second cylinder chamber 142 are filled with oil, and pressure is applied from respective hydraulic pressure supply ports 144 and 146 by a pump (not shown).
Further, the first cylinder chamber 140 and the second cylinder chamber 142
Is an O-ring 1 disposed on the outer periphery of the piston 132
41, an O-ring 143 disposed in the small-diameter hole 135 of the cylinder block 136, and an O-ring 145 disposed in the closing member 138, so that liquid tightness is maintained.

The hydraulic pressure in the first cylinder chamber 140 pushes the piston 132 backward, and the hydraulic pressure in the second cylinder chamber 142 pushes the piston 132 forward. Therefore,
The piston member 134 moves back and forth by these differential pressures. In the state shown in FIG. 4, the hydraulic pressure in the second cylinder chamber 142
Above that of zero, piston member 134 is in the rearmost position. The piston member 134 is formed with a piston through hole 150 penetrating before and after the piston member 134. An axial center member 152 having both ends protruding front and rear is slidably inserted into the piston through hole 150. ing. At the front end of the shaft member 152, a rod 1
30 is provided with a locking end 154 having substantially the same diameter as the outside diameter.
On the other hand, at the front end of the piston through hole 150, the diameter is formed larger than the outer diameter of the shaft center member 152. A compression spring 158 is provided between a step 156 located at the rear end of the large-diameter portion of the piston through hole 150 and a locking end 154 of the shaft member 152. In the state shown in FIG. 4, the biasing force of the compression spring 158 causes the shaft member 1
The stopper ring 160 attached to the rear end of the
The shaft member 152 is in contact with the rear end of the rod portion 131.
Takes the most forward position with respect to the piston member 134.

The locking end 154 of the shaft member 152 is opposed to the rear end 117 of the rod member 114 with a gap P therebetween. The gap P is sufficiently smaller than the stroke Q in the forward and backward movement of the piston member 134, and the locking end 154 comes into contact with the rear end 117 as the piston member 134 advances. Further, the first cylinder chamber 140 and the second cylinder chamber 142 are obtained by adding the urging force of the compression spring 158 and the urging force of the clamp spring 122.
Is configured so that the forward pressing force on the piston member 134 due to the differential pressure is sufficiently large. Therefore,
The locking end 154 in contact with the rear end 117 is
The rod member 114 is moved forward by a predetermined distance while the compression spring 8 and the clamp spring 122 are compressed.

FIG. 5 shows the grinding wheel spindle spindle 52 when the bar member 114 has moved forward by a predetermined distance. As shown in this figure, the rod member 114 is
When the rod 115 is moved forward by 2, the spherically shaped distal end 116 of the rod 115 elastically deformed inward is housed in the annular recess 111 of the through hole 112, and the rod 115 is opened. Accordingly, the locking portion 10 for clamping by the distal end portion 116 is used.
9 is released (hereinafter, this state is referred to as an “unclamped state”), and at the same time, the front end of the quill pushing member 123 at the inner diameter of the rod 115 comes into contact with the rear end of the tapered quill 107, and the second cylinder chamber The taper quill 107 is extruded with the pressure of 142. Thereby, the grindstone tool 68 becomes detachable from the rotating shaft 110.

Next, the operation of the embodiment configured as described above will be described. The rotating shaft 110 of the grindstone spindle 52 has a grindstone tool 68 that has been machined for a predetermined time.
It is assumed that the grindstone tool 68 is not held by the gripper 88 of the turning arm 90. Further, the grinding wheel spindle 52 stops the rotation of the rotating shaft 110. First, the turning arm 90 is rotated by 180 ° in the direction of arrow d from the original position indicated by the two-dot chain line in FIG. Then, the swing arm 90 is moved in the direction of arrow e by the unit forward and backward moving cylinder 96, and furthermore, the unit vertical cylinder 100 is moved.
As a result, the gripper 88 descends in the direction of arrow g.
Grasps the large-diameter portion 107a of the taper quill 107 of the grindstone tool 68 attached to the rotating shaft 110.

Next, in the grinding wheel spindle spindle 52, the pressure in the first cylinder chamber 140 is reduced, and a predetermined hydraulic pressure is applied in the second cylinder chamber 142.
34 moves forward from the position shown in FIG. Then, the locking end 154 presses the rear end portion 117 of the bar member 114 and moves the bar member 114 to open the front end portion 116 as shown in FIG. at the same time,
The front end of the quill pushing member 123 at the inner diameter of the rod 115 contacts the rear end of the tapered quill 107, and pushes out the tapered quill 107. Thereby, the taper quill 107 of the grindstone tool 68 is unclamped. Subsequently, the swivel arm 90 moves in the direction of arrow f in FIG. 1 in a state where the grindstone tool 68 is held by the gripper 88. Thereby, the grindstone tool 68 is detached from the rotating shaft 110. Then, the swing arm 90 moves up in the direction of the arrow h, and furthermore,
By rotating by 180 ° in the direction of arrow c, it returns to the original position.

Next, the swivel arm 90 moves in the direction of arrow e until the held grindstone tool 68 is positioned on the tool holding hole 76 of the stocker 70. At this time, the grindstone tool 68 is not stocked in the tool holding hole 76 located immediately below the gripper 88, and the turning arm 90 descends, so that the grindstone tool 68 is inserted into the tool holding hole 76.
When the used grindstone tool 68 is stored in the stocker 70, the gripper 88 moves in the direction f and releases the grindstone tool 68. Then, the turning arm 90 moves in the h direction,
Return to the original position again. Subsequently, the movable member 84 and the movable member 80 are alternately moved back and forth by the stocker positioning cylinder 86 and the stocker pitch feed cylinder 82, so that the stocker 70 rotates by a predetermined pitch. As a result, a new grindstone tool 68 before use is located at the position where the previously used grindstone tool 68 is inserted.

Next, the swivel arm 90 moves in the directions of arrows g and e, grips the new grinding tool 68 with the gripper 88, moves up, retreats and rotates in the same manner, and further moves in the directions of arrows g and e. Thus, a new grinding tool 68 is inserted into the rotating shaft 110 of the grinding wheel spindle 52. Then, the pressure of the second cylinder chamber 142 is reduced and the hydraulic pressure of the first cylinder chamber 140 is increased, whereby the piston member 134 is moved backward. As a result, the rod member 114 is moved from the position shown in FIG.
Is moved to the position shown in FIG.
Is clamped. When the grindstone tool 68 is held, the turning arm 90 returns to the original position, and the work of replacing the grindstone tool 68 on the grindstone spindle 52 ends.

As described above, in this embodiment, the automatic grinding wheel changing device is installed on the grinding wheel table 62 together with the grinding wheel spindle spindle 54, so that the grinding wheels can be aligned without using an NC device. Automatic change of the tool 68 can be performed. Further, by providing a mechanism for clamping the taper quill 107 of the grinding wheel tool 68 in the grinding wheel spindle spindle 52, the turning arm 90 of the grinding wheel transfer device 54 is simplified and the automatic grinding wheel changing device is downsized. It is possible to prevent a decrease in the movement accuracy when the 62 is reciprocated. Further, in this embodiment, the taper quill 107 of the grindstone tool 68 is provided with the taper portion 108,
On the side of the rotating shaft 110, a taper 113 to be fitted is provided,
In addition, since the grindstone tool 68 inserted into the through hole 112 is configured to be pulled by the urging force of the clamp spring 122, the grindstone tool 68 is stably held on the rotating shaft 110 without loosening.

In the above-described embodiment, the tip portion 116 of the rod 115 of the rod member 114 is formed in a spherical shape so as to pull the clamp locking portion 109 of the taper quill 107. Any other shape may be used as long as it protrudes inward. Also, for example,
The taper quill 107 'may be clamped by another structure such as the structure shown in FIG. In FIG. 6, the ball 1 is replaced by the ball 1 instead of the tip portion 116 of the bar member 114.
The rotation shaft 174 is provided with a ball holding hole 172 in which the ball 70 is accommodated, and the ball 170 is inserted from the outside thereof into the ball holding hole 172.
The sleeve 176 is fitted so as to be pushed into the sleeve 176. As a result, the ball 170 engages with the locking portion 109 'of the taper quill 107'.
The sleeve 176 is rotated by a compression spring 178.
4 in the direction of arrow k,
Is pressed. The sleeve 176 is slid in the direction of the arrow r, thereby releasing the ball 170 and bringing the tapered quill 107 'into an unclamped state. In the above embodiment, the cylinder 52B is driven by an oil cylinder. However, the cylinder 52B may be driven by an air cylinder, or the piston member 134 may be driven forward and backward by a motor.

[0027]

According to the spindle device with the automatic grinding wheel changing device of the present invention, the grinding wheel spindle spindle can be moved with high motion accuracy, and the positioning between the grinding wheel spindle spindle and the automatic grinding wheel changing device can be performed. In addition, the whetstone can be reliably replaced without causing the whetstone to be loosened.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a spindle device with an automatic grinding wheel changing device of the present invention.

FIG. 2 is a side sectional view of the same device.

FIG. 3 is a plan view of the same device.

FIG. 4 is a front view showing a cross section when the grinding wheel spindle spindle of the apparatus is in a clamped state.

FIG. 5 is a front view showing a cross section when the grindstone spindle of the apparatus is in an unclamped state.

FIG. 6 is a sectional view showing a modification of the apparatus.

FIG. 7 is an explanatory view showing a detachable portion of a grinding wheel in a conventional grinding machine.

FIG. 8 is an explanatory view showing a detachable portion of a grindstone in a conventional grinding machine.

[Explanation of symbols]

 Reference Signs List 50 Spindle device with automatic whetstone changing device 52 Whetstone shaft spindle 52A Spindle part 52B Cylinder part 62 Whetstone table 68 Whetstone tool 70 Stocker 76 Tool holding hole 82 Stocker pitch feed cylinder 86 Stocker positioning cylinder 88 Gripper 90 Rotating arm 92 Rotary drive mechanism 96 Unit forward / reverse cylinder 100 Unit vertical cylinder 107, 107 'Taper quill 108 Taper portion 109 109' Clamp locking portion 110 Rotating shaft 111 Annular recess 112 Through hole 113 Taper 114 Bar member 115 Rod 116 Tip end 122 Clamp spring 123 Quill extrusion Member 134 Piston member 140 First cylinder chamber 142 Second cylinder chamber 142 152 Shaft core member 154 Locking end 158 Compression spring 170 Baud 172 ball holding hole 174 rotating shaft 176 sleeve 178 a compression spring

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideyuki Iwabata 62 Chikusa-cho, Hanamigawa-ku, Chiba-shi, Chiba Hitec Seiko Co., Ltd. (56) References JP-A-61-61733 (JP, A) JP-A-63 -77652 (JP, A) Japanese Utility Model Showa 55-66746 (JP, U) Japanese Patent Publication No. 51-24757 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24B 45/00 B23B 31/117

Claims (1)

(57) [Claims] 1. A stocker in which a plurality of grindstone quills each having a tapered portion for reducing a diameter at a tip end portion side and a step portion formed therein, a plurality of grindstone quills formed therein, and a tapered portion of the grindstone quill are fitted. A quill holding hole having a tapered portion formed in the axial direction, a protruding member projecting inward from an inner peripheral surface of the quill holding hole of the rotating shaft, and being movable in a radial direction; In a state in which the grinding wheel quill is inserted into the hole, quill holding means for pressing the projecting member in the center direction to engage and hold the step portion of the grinding wheel quill, and provided on the same axis as the rotating shaft and in the axial direction. Work
Releasing means for releasing the engagement by a moving piston portion;
Transported and the grindstone shaft spindle with, the grinding wheel quills stored in the stocker, is inserted into the quill holding hole of said rotary shaft, a grinding wheel carrying means back into the remove the inserted said grinding wheel quill stocker, the A spindle device with an automatic whetstone changing device, comprising: whetstone transport means, said whetstone spindle, and said stocker, and moving means for integrally moving them.