JP2942461B2 - Rotary dresser for grinding wheel in grinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary dresser for a grinding wheel in a grinding machine.

[0002]

2. Description of the Related Art Conventionally, a rotary dresser device for a grinding wheel in a grinding machine such as a cylindrical grinding machine is shown in FIG.
Pulley 2 for driving and rotary diamond at both ends of rotating shaft 1
Those with 3 are often used. The rotating shaft 1 is rotatably supported by a bearing box 6 on the grinding machine main body via bearings 4 and 5 at an intermediate portion.
However, a rotary diamond 3 is detachably attached to the other end.

The rotary diamond 3 has a tapered hole 7,
In a state of being fitted over a tapered portion 8 formed at the other end of the rotating shaft 1, it is detachably fixed to a flange portion 9 integrally formed with the rotating shaft 1 by a bolt 10. Then, when performing dressing such as reshaping and dressing of the grinding wheel, the rotating shaft 1 is driven around the axis thereof from the belt 11 via the pulley 2 by a driving motor (not shown), and the rotating shaft 1 is The rotary diamond 3 is integrally rotated.

[0004]

The conventional rotary dresser has the disadvantage that the size of the whole apparatus is increased and the rigidity is reduced. In addition, when the rotary diamond 3 is mounted, the outer peripheral runout of the rotary diamond 3 is reduced on the machine. Has to be removed.

That is, in the conventional rotary dresser device, an intermediate portion of the rotating shaft 1 is supported by bearings 4 and 5,
1 is provided with pulleys 2 and rotary diamonds 3 at both ends, and when a grinding wheel is dressed, a rotating shaft protruding from the bearing housing 6.
Since a large load is applied to both ends of 1, it is necessary to increase the space between the left and right bearings 4 and 5 that support the rotating shaft 1 in the bearing housing 6 to ensure sufficient rigidity of the entire device. There is. As a result, the entire apparatus becomes extremely large, for example, the length of the rotating shaft 1 becomes long. When the apparatus is mounted on the grinding machine body, there is a disadvantage that a very large space is required on the grinding machine body side.

In addition, there is a limit in increasing the distance between the left and right bearings 4 and 5, and, in addition, the rotating shaft 1 is protruded outward from the bearings 4 and 5 in the axial direction. The pulley 2 and the rotary diamond 3 are provided in the section, and the pulley 2 and the rotary diamond 3 are separated from the bearings 4 and 5 to the protruding end side of the rotary shaft 1. In addition, shaft runout is likely to occur, and there is a structural problem in securing sufficient rigidity.

Further, in the conventional rotary dresser device, since the rotary diamond 3 is directly removably mounted on the end of the rotary shaft 1, when the rotary diamond 3 is replaced, the rotary diamond 3 is mounted inside the grinding machine. 3 must be attached to and detached from the rotating shaft 1, and in this case, there is a drawback that the running efficiency of the grinding machine is reduced because the outer circumferential runout of the rotary diamond 3 is inevitable, and the runout on the machine is required.

The present invention has been made in view of such conventional problems,
An object of the present invention is to provide a rotary dresser device for a grinding wheel in a grinding machine that can reduce the size of the entire device, maintain sufficiently high rigidity, can be replaced by a unit, and can greatly reduce setup change.

[0009]

According to the present invention, a pair of support brackets 2 provided on a grinding machine main body side are provided.
0,21, a fixed shaft 22 whose both ends are detachably fixed to the pair of support brackets 20,21, and bearings 23,24 on the outer periphery of the fixed shaft 22 between the pair of support brackets 20,21. And a rotating cylinder 25 rotatably fitted with the bearing.
23, 24, so as to correspond to the substantially outer peripheral positions thereof.
A driving pulley 26 and a rotary tool 27 are arranged side by side in the axial direction on the outer peripheral side of the motor.

According to a second aspect of the present invention, in the first aspect, each of the support brackets 20 and 21 is provided with a fixed shaft 22.
Are provided with fitting recesses 20a, 21a in which the fixing shafts 22 are removably fitted, and the fixing shafts 22 in the fitting recesses 20a, 21a are fastened to the respective support brackets 20, 21 so as to be removably fixed. Two
9 is provided.

[0011]

According to the first aspect of the present invention, the rotary cylinder body 25 is rotatably fitted on the outer periphery of the fixed shaft 22 between the pair of support brackets 20 and 21 via the bearings 23 and 24. 24, a driving pulley 26 and a rotary tool 27 are arranged on the outer peripheral side of the rotary cylinder 25 in the axial direction so as to correspond to the outer peripheral side of the rotary cylinder 25. Even if the size is reduced, sufficiently high rigidity can be secured and maintained. In addition, when the rotary tool 27 is replaced, the fixed shaft 22, the rotary cylinder 25, and the like can be attached to and detached from the support brackets 20, 21 as a single unit. Can be significantly reduced.

According to the second aspect of the present invention, since both ends of the fixed shaft 22 are fitted into the fitting recesses 20a, 21a of the support brackets 20, 21 and are removably fastened by the fasteners 28, 29. The fixing structure of the fixed shaft 22 is simple, and the fixed shaft 22 can be easily and reliably positioned and fixed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. This rotary dresser device is shown in FIGS.
As shown in FIG. 3, a pair of support brackets 20 and 21 provided on the grinding machine body side, a fixed shaft 22 having both ends detachably fixed to the pair of support brackets 20 and 21, and a pair of support brackets 20 and 21 A rotating cylinder 25 rotatably fitted to the outer periphery of the fixed shaft 22 through bearings 23 and 24 between the fixed shaft 22 and the bearing 21;
A driving pulley 26 and a rotary diamond 27 are arranged in the axial direction on the outer peripheral side of the rotary cylinder 25 so as to correspond to the substantially outer peripheral positions of 23 and 24.

A semi-circular fitting recess into which both ends of the fixed shaft 22 are removably fitted is provided at the distal end of each of the support brackets 20, 21.
20a, 21a are formed upward, and in a state where the fixed shaft 22 is fitted into the fitting recesses 20a, 21a, the fixed shaft 22 is fastened by fasteners, for example, bolts 28, 29 from above to the respective support brackets 20, 21.
It is detachably fastened to.

The fixed shaft 22 is fitted with two bearings 23, 24 which are disposed at a substantially central portion thereof at predetermined intervals in the axial direction via two inner and outer collars 30, 31. , This each bearing
The rotary cylinder 25 is rotatably supported around the axis of the fixed shaft 22 via 23 and 24. Inner ring 23a, 24a of each bearing 23, 24
Is fastened in the axial direction between the large-diameter portion 32 integrally formed with the fixed shaft 22 and a nut 34 screwed into the male screw portion 33 of the fixed shaft 22 via the collars 30 and 35 to fix the fixed shaft 22 Is fixed to the outer periphery of. The outer races 23b, 24b of the bearings 23, 24 are fitted over the inner periphery of the rotary cylinder 25, and a ridge 36 integrally formed on the inner periphery at one end of the rotary cylinder 25 and a disc-shaped bearing. It is fastened to the pressing plate 37 in the axial direction and fixed to the inner periphery of the rotary cylinder 25.

The rotary cylinder 25 has a large-diameter portion corresponding to substantially the outer peripheral position of the two bearings 23 and 24,
The pulley 26 and the tapered portion 39 are integrally formed on the outer periphery of the pulley 38, and a bearing holding plate is provided on one end surface on the pulley 26 side.
37 is detachably fixed by a plurality of bolts 40 in the circumferential direction. A drive belt 41 is wound around the pulley 26. The tapered portion 39 is configured such that the side opposite to the pulley 26 becomes thinner.

The rotary diamond 27 is an example of a rotary tool, and includes a support ring 42 detachable from the tapered portion 39 of the rotary cylinder 25, and diamond abrasive grains 43 provided on the outer periphery of the support ring 42. It has. Support ring 42
A tapered hole 44 is formed in the inner periphery of the rotary cylindrical body 25 so as to be detachably fitted to the tapered portion 39 of the rotating cylinder 25.
The tool 44 is detachably fixed to the rotary cylinder 25 by a tool holding plate 46 in a state where 44 is fitted on the tapered portion 39 of the rotary cylinder 25.

The tool holding plate 46 is a ring plate, and is detachably fastened to the support ring 42 by a plurality of bolts 45 in the circumferential direction on the side opposite to the pulley 26. The tool holding plate 46 is fitted over the outer periphery of the small diameter portion 47 of the rotary cylinder 25, and the support ring 42 is attached to the tapered portion 39 of the rotary cylinder 25.
The support ring 42 is detachably fixed to the large-diameter portion 38 side of the rotary cylinder 25 by a plurality of bolts 48 in the circumferential direction so as to press the support ring 42 against the pulley 26 so as to fit tightly.

The fixed shaft 22, the rotary cylinder 25, the pulley 26
The rotary diamond 27 and the like are all configured concentrically with respect to the axis of the fixed shaft 22, and in particular, the tapered portion 39 of the rotary cylinder 25 and the taper hole 44 of the rotary diamond 27 are
The rotary diagram 27 is configured to be concentric with the axis of the fixed shaft 22 when the support ring 42 of the rotary diagram 27 is fitted over the tapered portion 39 of the rotary shaft 27.

The large-diameter portion 32 of the fixed shaft 22 has an oil seal 49 sliding on the inner surface of the bearing holding plate 37, and the collar 35 has an oil seal 50 sliding on the inner surface of the protrusion 36 of the rotary cylinder 25.
Are detachably fitted to each other. An O-ring 51 is detachably interposed between the rotary cylinder 25 and the bearing pressing plate 37.

An oil seal 49 is provided on the large diameter portion 32 of the fixed shaft 22.
The flange 52 is provided integrally with the inner periphery of the bearing holding plate 37 so that a small gap is formed outside the rotary cylinder.
A tubular portion 53 is provided integrally with the outer end of the small diameter portion 47 so that a small gap is formed between the small diameter portion 47 and the nut 34.

In the above configuration, when dressing such as reshaping and dressing of a grinding wheel (not shown) using a rotary dresser device, a belt is driven by a drive motor (not shown) or the like.
The rotational power is transmitted to the pulley 26 via 41. Then, the pulley 26 is provided integrally with the rotary cylinder 25 rotatably supported on the fixed shaft 22 via bearings 23 and 24, and the rotary diagram 27 is fixed to the rotary cylinder 25. The pulley 26, the rotary cylinder 25, and the rotary diagram 27 rotate integrally at high speed around the axis of the fixed shaft 22.

Then, while the rotary diamond 27 is being rotated at a high speed around the fixed shaft 22, the rotary diamond 27 is cut by a very small amount, and the diamond abrasive grains 43 of the rotary diamond 27 are cut.
In addition to shaping the shape of the grinding wheel, the tip of the abrasive grain of the grinding wheel is finely crushed to improve sharpness.

In this rotary dresser device, bearings 23, 24 are mounted on the outer periphery of the fixed shaft 22 between the pair of support brackets 20, 21.
The driving pulley 26 and the rotary diamond 27 are mounted on the outer peripheral side of the rotating cylindrical body 25 so as to correspond to substantially the outer peripheral positions of the bearings 23 and 24. Since they are arranged side by side in the direction, the entire device can be reduced in size, and sufficiently high rigidity can be secured and maintained even if the entire device is reduced in size.

That is, on the outer periphery of the rotating cylinder 25,
Since the pulley 26 and the rotary diagram 27 are arranged side by side so as to correspond to substantially the outer peripheral positions of the bearings 23 and 24 rotatably supporting the fixed shaft 22 on the fixed shaft 22, the pulley 2 and the rotary diagram 3 Can be reduced in size as compared with the case where these are separately provided at both ends of the rotating shaft 1. For this reason, there is an advantage that, even when mounted on the grinding machine main body, it can be easily mounted if there is a small space near the grinding wheel.

Further, even when the whole apparatus is downsized, the length of the fixed shaft 22 itself fixed to the pair of support brackets 20 and 21 is shortened, and the pulley 26 and the rotary diamond 27 on the outer periphery of the rotary cylinder 25 are reduced. Correspond to the substantially outer peripheral positions of the bearings 23 and 24 inside the rotating cylinder 25, so that the inclination of the rotating cylinder 25 due to the load at the time of dressing can be reduced.

In particular, there are two bearings 23, 24 in the axial direction inside the rotary cylinder 25, and a pulley on the outer periphery of the rotary cylinder 25 is provided.
Since the rotary diamond 26 and the rotary diamond 27 substantially correspond to the bearings 23 and 24, respectively, the load on the pulley 26 and the rotary diamond 27 can be shared and reliably received by the bearings 23 and 24. Therefore, even if the entire apparatus is downsized, it is possible to secure and maintain a sufficiently high rigidity as compared with the related art.

In addition, since the pulley 26 is formed integrally with the rotary cylinder 25, a tapered portion 39 is formed on the rotary cylinder 25, and the rotary diamond 27 is taperedly fitted to the tapered portion 39. As a matter of course, the number of points is reduced, and it is easy to secure the accuracy in manufacturing the three devices. Therefore, the accuracy among the three members is improved, and a decrease in rigidity can be prevented. In particular, centering of the rotary diagram 27 that requires replacement can be easily performed.

When replacing the rotary diagram 27, the bolts 28 and 29 fixing both ends of the fixed shaft 22 to the support brackets 20 and 21 are removed, and the rotary cylinder 25 and the like are mounted on the fixed shaft 22. In the unit state, fix the fixed shaft 22 to each support bracket.
Remove upward from fitting recesses 20a, 21a of 20,21. Then, replace it with another unit prepared and placed in advance, and attach both ends of the fixed shaft 22 of the new unit to each support bracket 2.
After fitting into the fitting recesses 20a, 21a
Thus, both ends of the fixed shaft 22 are fixed to the respective support brackets 20, 21.

The unit removed from the support brackets 20, 21 removes the bolt 48 of the tool holding plate 46 outside the machine, pulls out the support ring 42 of the rotary diamond 27 from the tapered portion 39 of the rotary cylinder 25, and separates it. New rotary diamond
27 is fitted into the tapered portion 39 of the rotary cylinder 25 and fixed with the tool holding plate 46 and the bolt 48.

As described above, when the rotary diamond 27 is replaced,
Fixed shaft 22, rotating cylinder 25, pulley 26, rotary diamond 27
And the like can be attached to and detached from the support brackets 20 and 21 as a single unit, and can be handled very easily when the attachment and detachment are possible. After the fixed shaft 22, the rotary cylinder 25, and the like are removed from the support brackets 20, 21 in a unit state, the rotary diagram 27 of the unit can be replaced outside the machine.

Therefore, the setup change at the time of replacing the rotary diamond 27 can be performed easily and quickly, and the time required can be greatly reduced. Moreover, fixed shaft
Since both ends of 22 are fitted into the fitting recesses 20a, 21a of the support brackets 20, 21 and fastened with the bolts 28, 29, the fixing structure of the fixed shaft 22 is simple, and the fixed shaft 22 is easily and reliably positioned. And can be fixed.

In the embodiment, a pulley is attached to the rotary cylinder 25.
Although 26 is provided integrally, a tapered portion may be provided on the outer periphery of the rotary cylinder 25, and the pulley 26 may be taperedly fitted to the tapered portion and fixed. As the rotating tool, various dress tools other than the rotary diamond 27 may be used, and the shape, structure, material, and the like are not limited to the embodiments.

Further, in the embodiment, the support brackets 20, 21
Although the fixed shaft 22 is directly fastened to the support brackets 20 and 21 with the bolts 28 and 29 in the fitting recesses 20a and 21a, the fixed shaft 22 may be indirectly fastened via a shaft holding member or the like. This rotary dresser device can be mounted on a cylindrical grinding machine, an inner surface grinding machine, a centerless grinding machine, and other various grinding machines.

[0035]

According to the first aspect of the present invention, a pair of support brackets provided on the grinding machine body side, a fixed shaft having both ends detachably fixed to the pair of support brackets, A rotary cylinder rotatably fitted via a bearing to the outer periphery of the fixed shaft between a pair of support brackets, and an outer peripheral side of the rotary cylinder so as to correspond to a substantially outer peripheral position of the bearing. Since the driving pulley and the rotary tool are arranged side by side in the axial direction, it is possible to reduce the size of the entire apparatus and to secure and maintain sufficiently high rigidity even if the entire apparatus is reduced in size. In addition, when replacing the rotating tool, the fixed shaft, rotating cylinder, etc. can be attached to and detached from the support bracket as one unit, so that the outer peripheral runout of the rotating tool can be corrected or prevented outside the machine, and the setup change when replacing the rotating tool can be performed. It is easier and faster, and the time can be significantly reduced.

According to the second aspect of the present invention, in the first aspect of the present invention, each support bracket is provided with a fitting recess in which a fixed shaft is removably fitted. Since the fastener for fastening the fixed shaft to each of the support brackets and removably fixing the fixed shaft is provided, the fixing structure of the fixed shaft is simple, and the fixed shaft is easily and reliably positioned and fixed to each support bracket. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a rotary dresser device of the present invention.

FIG. 2 is a partially cutaway side view showing one embodiment of the rotary dresser device of the present invention.

FIG. 3 is a sectional view showing a conventional rotary dresser device.

[Explanation of symbols]

 20,21 Support bracket 20a, 21a Fitting recess 22 Fixed shaft 23,24 Bearing 25 Rotating cylinder 26 Pulley 27 Rotary diamond (Rotating tool) 28,29 Bolt (Fastening tool) 39 Taper

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-220663 (JP, A) JP-A-5-29665 (JP, U) (58) Fields investigated (Int.Cl. ⁶ , DB name) B24B 53/053

Claims (2)

(57) [Claims] 1. A pair of support brackets provided on a grinding machine main body side, a fixed shaft having both ends detachably fixed to the pair of support brackets, and an outer periphery of the fixed shaft between the pair of support brackets. A rotary cylindrical body rotatably fitted via a bearing, and a driving pulley and a rotary tool mounted on an outer circumferential side of the rotary cylindrical body in an axial direction so as to correspond to a substantially outer circumferential position of the bearing. A rotary dresser device for a grinding wheel in a grinding machine, wherein the rotary dresser device is arranged side by side. 2. A fastener which is provided in each of the support brackets with a fitting recess in which a fixed shaft is detachably fitted, and in which the fixed shaft in each of the fitting recesses is fastened to each of the support brackets so as to be detachably fixed. The rotary dresser device for a grinding wheel in a grinding machine according to claim 1, wherein the grinding wheel is provided.