JP3318369B2 - Grinding machines and wheel side dressers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding machine for grinding an inner ring flange of a double-row cylindrical roller bearing having a tapered flange surface, and a grindstone side dresser mounted on the grinding machine.

[0002]

2. Description of the Related Art In a cylindrical roller bearing with a flange, when the speed is increased, the flange surface is tapered to improve lubricity. In the case of grinding the inner ring flange of this tapered surface, as shown in FIG. 7, a grindstone 51 in which both side surfaces 51 a of the outer peripheral edge are inclined surfaces is used.

In such a dressing device for the side surface 51a of the grindstone 51, a dress slide 52 corresponding to each side surface 51a is provided, and each dress slide 52 is slightly inclined from a plane perpendicular to the rotation axis R of the grindstone 51. The one that moves forward and backward is used. The dress slide 52 has a diamond 53 at the tip.

Some cylindrical roller bearings having a tapered flange surface have a double row as shown in FIG. In the figure, 61 indicates an inner ring, 62 indicates an outer ring, and 63 indicates rollers. In this bearing, in order to simultaneously process the four flange surfaces of each inner ring flange 61a, 61b, as shown in FIG.
1, 51 are installed coaxially and used. Each Tsuba 61
a, 61b, that is, the inclination α of the side surface 51a of the grindstone 51 is about 10 'to 15'.

[0005]

In this case, the distance d between the two grindstones 51 is set to be very narrow, for example, about 2 to 5 mm in accordance with the width of the central inner ring flange 61b. . Therefore, if two dressers shown in FIG. 7 are arranged side by side and used for each grindstone 51 in FIG.
The diamond support portion of the dress slide 52 that enters between the first and the first 51 becomes narrow to avoid mutual interference, and the rigidity required for the dress cannot be obtained. If the two dressers are shifted vertically, there is a margin in the arrangement of the diamond support portion between the grindstones 51. However, since a total of four dress slides 52 are used, the space for the advance / retreat guide and the drive system is provided. In consideration of this, it is also difficult to arrange the dressers shown in FIG. Therefore, in many cases, it is not possible to dress the side surface 51a on the adjacent side of the two grindstones 51a.

As a solution to this problem, it is conceivable to use a rotary dress. However, the rotary dress has a complicated structure, is expensive, and cannot be adjusted according to the product type. Can not.

As described above, since an appropriate dressing device cannot be obtained, simultaneous grinding of four flange surfaces of the inner ring 61 in FIG. 5 cannot be actually performed, and one grindstone 51 is moved in the axial direction. Or, the inner ring 61 is turned over to grind each groove. Therefore, there is a problem that productivity is poor and it is difficult to obtain high precision in the parallelism of the flange surface between the two rows of grooves. Further, in the dresser of FIG. 7, since the two dress slides 52 are driven forward and backward, respectively, there is a problem that the configuration of the support portion and the like of the dress slide 52 becomes large even when used alone.

[0008] The object of the present invention is to provide a four-wheel coaxial grinding wheel.
An object of the present invention is to provide a grinding machine capable of simultaneously grinding inclined flange surfaces at locations and capable of accurately dressing inclined surfaces on both sides of two grindstones without reducing rigidity of a dressing tool support portion. Another object of the present invention is to provide a grinding wheel side dresser which can be made compact and can be used for dressing two adjacent grinding wheels.

[0009]

According to a first aspect of the present invention, there is provided a grinding wheel side dresser which is applied to a grinding machine having a disk-shaped grinding wheel having an outer peripheral edge formed in a trapezoidal cross section in which both side surfaces are inclined surfaces.
In this grinding machine, only set dress slides with arm pair advancing the grinding wheel between each other, each of said arm pairs
Arm shall extend radially of the grinding wheel, provided each dress tool in contact with the respective inclined surfaces of the grinding wheel in each arm of A over arm pairs. The arm along but such advanced or retreated dress slide in a radial direction of the grinding wheel al, in the forward and backward direction
Around the rotational center as the center of the pairs to Jo Tokoro angle rotation provided reciprocating rotary drive. The forward and backward rotation driving device, de
By rotating the slide while moving it forward,
Grinding stone thickness direction between dress tools provided on a pair of arms
This is to change the distance to the direction.
The distance to the direction depends on the advance of the dress slide.
The distance when the grinding stone starts to enter between the arm pair is narrow,
When starting to enter the above, so that it spreads as you move forward
This is the setting of the rotation angle of the dress slide
You.

A grinding machine according to a second aspect of the present invention is a grinding machine in which a disc-shaped grindstone having an outer peripheral edge formed into a trapezoidal cross section having both sides inclined is provided.
A grinder in which two grinders are arranged side by side coaxially with a slight gap between the outer peripheral portions, wherein two grinder side dressers according to claim 1 are respectively arranged in parallel with each grinder.

[0011]

According to the grinding wheel side dresser, as the dress slide rotates while moving forward, the distance between the dress tools provided on the pair of arms in the grinding wheel thickness direction changes. Therefore, by narrowing the interval at which the grinding wheel starts to enter between the arm pairs by the advancement of the dress slide, and setting the rotation angle so that it spreads with the advancement, the inclined surfaces on both sides of the grinding stone can be moved along the inclination direction. And dress at the same time.

When the side dressers of the grinding wheels are arranged side by side with respect to two adjacent grinding wheels provided coaxially, by appropriately setting the relationship between the rotation angles of both dress slides, the two dressing wheels can be positioned between the two grinding wheels. Interference between the arm of one dress slide and the arm of the other dress slide that enter can be avoided. Therefore, each arm can be made thick enough to obtain sufficient rigidity required for the dress.

According to the grinding machine of the present invention, it is possible to dress two such grinding wheels in close proximity to each other, and there is no problem in dressing. The inclined flange surface can be ground at the same time.
Since simultaneous grinding is performed in this manner, the conical central axes of the four flange surfaces can be aligned with high precision.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 2A is a plan view of a flange grinder, and FIG.
FIG. Two disc-shaped whetstones 2 on whetstone shaft 1
A and 2B are attached with a slight gap therebetween, and a main shaft 3 for driving the work W and a two-side compound type grindstone side dresser 4 are installed on both sides of the grindstone shaft 1, respectively. The grindstone shaft 1 is installed on a grindstone head (not shown) in parallel with the main shaft 3 and is driven to rotate.
To go back and forth. The work W is rotatably supported by the work support 5, is attracted to the magnet chuck of the main shaft 3, and is driven to rotate.

The work W is a material for the inner ring 61 of the double row cylindrical roller bearing shown in FIG. 5, and has two circumferential grooves Wa turned. The grindstones 2A and 2B grind each flange surface, which is the side surface of the groove Wa, into a predetermined taper shape, and the outer peripheral edge thereof is formed in a trapezoidal cross section in which both side surfaces are inclined surfaces s as shown in FIG. Have been. The inclination angle of each inclined surface s is shown in FIG.
Similarly to the inclination angle α of the grindstone 51 shown in FIG.
It is a slight angle of about 5 '. The diameter of the whetstone 2A, 2B is
For example, it is 400-500φ. In addition, whetstone 2A,
2B is to grind the bottom surface which becomes the raceway surface of the groove Wa of the work W at the same time as the flange surface. In addition to the grindstone side dresser 4 of FIG. 2, the grindstone outer peripheral dresser (not shown) dresses the outer peripheral surfaces of the grindstones 2A and 2B. (Not shown) is provided as appropriate.

In FIG. 2, a composite type grinding wheel side dresser 4 is shown.
Is installed on the frame 6 so as to be able to advance and retreat in the X-axis direction with respect to the grinding wheel shaft 1.
The dress head 8 is provided with a pair of dress slides 9 constituting two individual grinding stone side dressers 4A, 4B. Both individual wheel side dresser 4
A and 4B have the same configuration.

As shown in FIG. 1, each dress slide 9,
Numeral 9 has an arm pair 10 for entering the outer peripheral portions of the grindstones 2A and 2B, and a diamond dressing tool 11 which is in contact with the inclined surface s of the grindstones 2A and 2B is provided on the inner surfaces of the tips of both arms 10a and 10b. I have.

As shown in FIG. 3, the dress slide 9
A split groove 12 is provided between the arms 10a and 10b, and an adjusting screw 13 is inserted from one side of the split groove 12 and screwed into a screw hole of the other one side. By tightening the adjusting screw 13, the width of the split groove can be reduced against the elasticity of the material of the dress slide 9, whereby the distance between the pair of dress tools 11 can be adjusted.

The dress slide 9 is installed in a rectangular tubular advance / retreat guide 14 so as to be able to move forward and backward, and can be driven forward and backward by a forward / backward cylinder 16 composed of a hydraulic cylinder. The guide of the dress slide 9 by the advance / retreat guide 14 is adapted to provide rotation as the advance / retreat is performed, as described later.
Thus, the forward / backward rotation drive device 17 is configured. The advance / retreat guide 14 and the advance / retreat cylinder 16 are both fixed to the base plate 8a (FIG. 3) of the dress head 8 in FIG. The rear end of the dress slide 9 is connected to a piston rod of the reciprocating cylinder 16 via a rotary joint 22 as shown in FIG. The rotary joint 22 allows mutual rotation of the shafts on both sides, and transmits only the drive in the axial direction.

The guide by the reciprocating guide 14 is formed by a curved groove 18a having a V-shaped cross section formed on the upper and lower surfaces of the dress slide 9.
A large number of balls 20 are interposed between the 18b and guide grooves 19 having V-shaped cross sections formed on the upper and lower inner wall surfaces of the advance / retreat guide 14 to provide a rolling guide. Each curved groove 18a, 18b
The guide groove 20 is provided over the entire length of the dress slide 9 and the advance / retreat guide 14, and each ball 20 is loosely fitted in each pocket of the plate-shaped retainer 21.

As shown in FIG. 4, the curved grooves 18a and 18b on the upper and lower surfaces of the dress slide 9 are formed in the shape of a screw groove of a ball screw, and the lead of the screw is, for example, one.
It has a gently curved path with an extremely long lead of about m. The upper and lower race grooves 18a and 18b are grooves of a double thread and are symmetrical with each other around the axis of the dress slide 9. Upper and lower track grooves 19 of the reciprocating guide 14
Are also formed in a curved path corresponding to the curved grooves 18a and 18b of the dress slide 9. In this embodiment, the fitting portion between the advancing / retreating guide 14 and the dress slide 9 is square, but the rotation of the dress slide 9 is slight, so that the operation is not hindered even if it is square. Of course, the advance / retreat guide 14 and the dress slide 9 may have a circular cross section.

The operation of the above configuration will be described. When dressing, bring the dressing device body 7 close to the grindstones 2A and 2B,
Both dress slides 9, 9 are advanced by an advance / retreat cylinder 16. At this time, since each of the dress slides 9 has the thread groove-shaped curved grooves 18a and 18b engaged with the curved track groove 19 of the advance / retreat guide 14 via the rolling element 20, as shown by an arrow a in FIG. Rotation occurs as the vehicle moves forward.

Therefore, the distance between the dressing tools 11, 11 provided on the pair of arms 10a, 10b of the dress slide 9 increases the distance between the whetstones 2A,
2B in the thickness direction. Therefore, when the grindstones 2A and 2B start to enter between the arm pair 10, by setting the rotation angle so as to spread with the advance, the inclined surfaces s on both sides of the grindstones 2A and 2B are set along the inclined direction. And dress at the same time. Also, by appropriately setting the relationship between the rotation angles of the dress slides 9 on both sides, as shown in FIG.
Arm 10 of right dress slide 9 entering between 2B
b and interference with the arm 10a of the left dress slide 9 can be avoided. Therefore, each of the arms 10a and 10b can be made thick enough to obtain sufficient rigidity required for the dress.
In addition, the grinding wheel side dressers 4A and 4B can simultaneously grind both surfaces of the grinding wheels 2A and 2B with one dress slide 9, and thus have a compact configuration.

According to this grinding machine, the problem in dress is solved in this way, and the work W can be performed by the two grindstones 2A and 2B.
It is possible to simultaneously process four inclined flange surfaces in the two grooves Wa with a single cut. Therefore, 1
Grinding can be performed in about half the time of work with a single whetstone,
In addition, the number of grinding devices can be reduced to one. Further, since the four flange surfaces of the two grooves are ground by one chuck of the work W, no error due to gripping occurs, and the conical central axes of the four flange surfaces are aligned with high accuracy. Therefore, the double row cylindrical roller bearing of the inclined flange surface type can be a highly accurate one having no so-called run-out of the flange end surface. When the grinding of the flange surface is completed, the cutting is continued as it is, and the raceway surface, which is the bottom surface of the two grooves Wa of the work W, is ground by the outer peripheral surfaces of the grindstones 2A and 2B.

In the above embodiment, the ball slide 20 is engaged with the curved grooves 18a, 18b as the forward / backward rotation drive unit 17 for the dress slide 9, but the forward / backward rotation drive unit 17 moves the dress slide 9 forward and backward. What is necessary is just to be able to rotate, and various other structures can be used. Further, in the above-described embodiment, the case where the grinding wheel side dressers 4A and 4B are applied to a grinding machine having two grinding wheels 2A and 2B has been described, but the invention can also be applied to a grinding machine having one grinding wheel. The effect of downsizing can be obtained.

[0026]

The dressing side dresser of the present invention is provided with a dressing tool on a pair of arms provided on a dress slide for allowing a whetstone to enter between the dressing slides, and a forward / backward rotation drive for rotating the dress slide by a predetermined angle. Since the apparatus is provided, it is possible to dress the inclined surfaces on both sides of the grindstone at the same time by rotating the dress slide while moving forward. As described above, since only one dress slide needs to be provided, a compact configuration can be achieved as compared with a configuration using separate dress slides on both sides of the grindstone.

In the grinding machine of the present invention, since two grindstones are provided coaxially close to each other, four inclined flange surfaces in two grooves of the work can be simultaneously machined by a single cut. Therefore, the working efficiency is greatly improved, and no error occurs due to the re-gripping of the work, and the conical central axes of the four flange surfaces can be aligned with high precision. Also,
Since the grinding machine according to the present invention has the side dressers having the above-described configuration arranged side by side, by appropriately setting the relationship between the rotation angles of the two dress slides, one of the dress slides entering between the two whetstones can be used. Interference between the arm and the arm of the other dress slide can be avoided. Therefore, each arm can be made sufficiently rigid, and dressing of the opposed inclined surfaces of two adjacent whetstones becomes possible. Therefore, simultaneous grinding of four surfaces by the two grinding wheels can be realized without causing a problem in dress.

[Brief description of the drawings]

FIG. 1A is a plan view of a main part of a side dresser for a grindstone according to an embodiment of the present invention, and FIG.

FIG. 2A is a plan view of a grinding machine equipped with a grinding wheel side dresser of the embodiment, and FIG. 2B is a front view thereof.

FIG. 3 is a perspective view of a grindstone side dresser.

FIG. 4 is a cutaway perspective view showing the forward / backward rotation driving device for the dress slide.

FIG. 5 is a sectional view of an example of a bearing for grinding an inner ring flange with the grinding machine.

FIG. 6 is an explanatory diagram of the shape of a grindstone.

FIG. 7 is a partial plan view of a conventional grindstone side dresser.

FIG. 8 is a sectional view thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Whetstone axis, 2A, 2B ... Whetstone, 3 ... Spindle, 4 ... Composite whetstone side dresser, 4A, 4B ... Whetstone side dresser, 7 ...
Dressing apparatus body, 9: dress slide, 10: arm pair, 10a, 10b: arm, 11: dress tool, 14
... Advancing / retracting guide, 16 ... Advancing / retracting cylinder, 17 ... Advancing / retracting rotary drive, 18a, 18b ... Curved groove, W ... Work

Claims (2)

(57) [Claims] 1. A grinding machine the outer peripheral edge sides have a disk-shaped grindstone formed into a trapezoidal cross section comprising an inclined surface, only set dress slides with arm pair to enter the grinding wheel between each other, the Each arm of the arm pair is half of the whetstone
Shall extend radially, provided dresses tool in contact with the respective inclined surfaces of the grinding wheel in each arm of the front Symbol arm pairs each,
The dress slide radially such advanced and retreated <br/> La of the grinding wheel, rotating at the heart between arm pairs along its moving direction
The forward and backward rotation driving device for Jo Tokoro angular rotation about the center provided, the forward and backward rotation driving device, by rotating while advancing the dress slides between dresses tool provided on the pair of arms, the interval for the grinding wheel thickness direction The distance in the thickness direction of the grindstone, the distance when the grindstone starts to enter between the arm pair by the advance of the dress slide is narrow, so as to spread with the advance, when the above-mentioned start to enter Dress slide
Side dresser with a set rotation angle . 2. A grinding machine in which two disc-shaped grinding stones each having an outer peripheral edge formed in a trapezoidal cross section having inclined surfaces on both sides are coaxially arranged side by side with a slight gap between the outer peripheral portions. Item 2. A grinding machine characterized in that two grinding wheel side dressers according to Item 1 are provided in parallel with each grinding wheel.