JP7315973B2 - roller support - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller holding device (roller support) for holding tapered rollers when polishing a work surface having a circular cross section using a centerless (centerless) polishing device or the like.

2. Description of the Related Art Various forms of bearings for supporting a rotating shaft are used in power transmission parts of rotary equipment in production machines in the manufacturing industry and transportation machines such as automobiles. Among bearings, cylindrical roller bearings and tapered roller bearings are used for portions that support larger loads than ball bearings.
Cylindrical roller bearings mainly receive radial loads, while tapered roller bearings receive both radial and axial loads. However, in any roller bearing, the rotation of rollers with a circular cross section enables smooth rotation of the shaft and reduces power loss in the bearing.

In addition, the smoother the surface of the cylindrical rollers used in cylindrical roller bearings and the tapered rollers used in tapered roller bearings, the higher the quietness during rotation and the higher the durability of bearings using these. . For this surface smoothing, Patent Document 1 introduces a technique of polishing (superfinishing) the circumferential surfaces of cylindrical rollers and tapered rollers using a centerless grinding machine.

Japanese Patent No. 6842703

In the technology (centerless grinding device) introduced in Patent Document 1, a pair of rollers with a cylindrical appearance is used when grinding the peripheral surface of a cylindrical roller, and a truncated cone in appearance when grinding the peripheral surface of a tapered roller. A pair of rollers are used. This is because, for example, when the grinding process is superfinishing, the superfinishing grindstone is horizontally vibrated within an imaginary vertical plane including the axial center of the roller, so that the roller peripheral surface supported by the pair of rollers is at the highest position. This is because the generatrix (ridge line) needs to be horizontal (Figs. 7(c), (d) and Figs. 9(e), (f) of Patent Document 1).

The pair of rollers described in Patent Literature 1 can be used only for cylindrical rollers or only for tapered rollers, both in cylindrical shape and truncated cone shape. In particular, for truncated conical rollers, even if the rollers are tapered, if the degree of inclination of the peripheral surface (apex angle of the cone as a part of the cone) differs, the roller must be replaced to level the ridgeline. must. The use of the pair of rollers described in Patent Document 1 is limited to only cylindrical rollers in a columnar shape and only tapered rollers in a truncated conical shape.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roller support (roller holding device) that can be used for both cylindrical rollers and tapered rollers.

A roller support according to the present invention uses a pair of rotatable cylindrical rollers.
When holding the tapered rollers, the pair of rollers should be arranged horizontally when viewed from above so that the extensions of the axial centers intersect, and when viewed from the direction in which the two rollers are aligned, the two axial centers should be aligned. The side where the two intersect is positioned higher than the other side. The tapered rollers are held on the pair of rollers with their small-diameter bottom faces positioned on the side where the axes intersect.
Also, when holding the cylindrical rollers, the pair of rollers should be arranged horizontally when viewed from above so that their axes are parallel to each other, and when viewed from the direction in which the two rollers are lined up, each are positioned so that their axes are horizontal. A cylindrical roller is held on a pair of rollers.

Here, "aligned horizontally when viewed from above" does not mean that even the axis of the roller is so-called "horizontal", but means aligned in a direction perpendicular to the "vertical direction". is.
A roller support according to the present invention is a device for holding an object to be polished in a centerless polishing apparatus. The roller support consists of a pair of rotatable cylindrical rollers arranged so as to be able to hold a polishing object thereon, and when the pair of rollers are viewed from above, the extension of one side of the axis of each intersects or the axis A rotation device for rotating a pair of rollers in opposite directions so that the rollers are parallel to each other, and a side where the extension of the shaft center intersects when viewed from the alignment direction of the pair of rollers. and a tilting device for changing the tilt of the roller so that it is also horizontal.
The tilting device includes a tilting motor, a tilting pinion rotated by the tilting motor, and a tilting rack which is meshed with the tilting pinion and swings integrally with the roller, and the tilting motor is a servomotor.

Preferably, the roller support comprises a gap changing device for changing the gap between the pair of rollers.
Preferably, the tilting device is arranged so that the pair of rollers always has the same tilt.
Preferably, the diameters of the pair of rollers in the roller support are the same, and the rotation device is configured so that the absolute values of the rotation angles of the pair of rollers in opposite directions are the same.

Preferably, the roller support is configured such that the spacing changer moves each of the pair of rollers in opposite directions and the distances traveled are the same.

According to the present invention, it is possible to provide a roller support (roller holding device) that can be used for both cylindrical rollers and tapered rollers.

1 is a perspective view of a roller support; FIG. FIG. 2 is a front view of the roller support. FIG. 3 is a plan view of the roller support. FIG. 4 is a front view for explaining each part of the roller support that moves integrally. FIG. 5 is a diagram showing how the roller support holds the cylindrical rollers. FIG. 6 is a diagram showing the operation of roller supports for holding cylindrical rollers. FIG. 7 is a diagram showing how the roller support holds cylindrical rollers having different diameters. FIG. 8 is a diagram showing how the roller support holds tapered rollers of different sizes. FIG. 9 is a diagram showing another form of roller. FIG. 10 is a diagram showing another form of roller.

1 is a perspective view of the roller support 1; FIG. 2 is a front view of the roller support 1; FIG. 3 is a plan view of the roller support 1; It is a diagram.
A portion B surrounded by a dashed line in FIG. 3 is a cross section of the interval changing device 29 taken along the arrow AA in FIG. The relationship of the rack 45b is shown.

4(a), (b), (c), and (d) indicate the stage main body 2, the tilt table 3, the rotating shaft angle changing device 4a, and the roller holder 5a, which will be described below. Instead, it shows the parts that are integrated and the mutual positional relationship is unchanged.
The roller support 1 includes a stage main body 2, a tilt table 3, a pair of rotating shaft angle changing devices 4a and 4b, roller holders 5a and 5b, and the like.

The stage main body 2 comprises two stages 11, a base 12, a tilt device 13, a plurality of anti-swing clamps 14, 14, and the like.
The stage 11 is a curved thick plate having a concave curved surface 15 (hereinafter referred to as the “stage sliding surface 15”) having an arcuate cross-section with the center of curvature of the arc (hereinafter referred to as the “arc center C”) C on the outside. shape part. The stage 11 corresponds to the "stage main body" in the "gonio stage". One stage 11 is provided at each end of the stage main body 2 in the direction of the generatrix of the stage sliding surface 15 (vertical direction in FIG. 3). In other words, the two stages 11 are arranged at both ends of the roller support 1 in the direction in which the two rollers 51a and 51b are arranged (vertical direction in FIG. 3).

The base 12 supports the stage 11 on its upper part and itself is intended to be integrated into an apparatus for superfinishing or the like of the peripheral surface of the roller in which the roller support 1 is incorporated.
The tilting device 13 comprises a tilting motor 21, a tilting pinion 22, a tilting rack 23, and the like. The tilting motor 21 is a servomotor. The tilt pinion 22 is attached to the horizontally arranged output shaft of the tilt motor 21 . The tilting rack 23 is an arcuate rack with teeth arranged in an arc. The tilting rack 23 is fixed to the tilting table 3 with the tooth width direction (the direction in which the tip of one tooth extends) horizontal, and its teeth are meshed with the tilting pinion 22 .

The rocking prevention clamp 14 serves to fix the tilt table 3 to the stage main body 2, for example, when the rollers held by the roller support 1 are polished. A method of fixing the tilt table 3 with the swing preventing clamp 14 will be described in the description of the tilt table 3 .
The stage 11 has two guide wheels 16,16. The guide wheels 16 , 16 will also be explained in the description of the tilt table 3 .

The tilting table 3 includes two sliding portions 26, a dovetail 27, two dovetail grooves 28a and 28b, an interval changing device 29, and the like.
The sliding portion 26 is in the shape of a curved thick plate, and both surfaces (upper and lower surfaces in FIG. 2) of the sliding portion 26 are arcuate concave upwards. In the roller support 1, the center of curvature of the arc on both surfaces coincides with the arc center C. In addition, the radius of curvature of the arcuate surface below the sliding portion 26 is substantially equal to the radius of curvature of the curved stage sliding surface 15 .

At least one of the sliding portions 26 is provided with a through hole 30 near the end surface thereof, which penetrates between the upper and lower surfaces and has an opening extending in the circumferential direction of the arc.
The sliding portion 26 is placed on the stage sliding surface 15 of the stage 11 so as to be able to swing.
The dovetail 27 has a rectangular plate-shaped thick plate portion, and a protruding portion 31 that protrudes from the upper surface of the thick plate portion and extends in a strip shape having an inverted trapezoidal cross section. The protruding portion 31 extends in the direction in which the two sliding portions 26 are arranged (vertical direction in FIG. 3).

The protruding portion 31 of the dovetail 27 is provided with two elongated rectangular grooves 38, 38 (hereinafter referred to as "moving grooves 38") aligned in the direction in which the protruding portion 31 extends, and a narrower groove is provided between them. is connected.
The dovetail 27 has its thick plate portion fixed on the sliding portion 26 with its protruding portion 31 facing up in a front view (FIG. 2).

Each of the dovetail grooves 28a and 28b has a groove that fits the protruding portion 31 of the dovetail 27, and the protruding portion 31 is fitted into the groove and moves in the direction in which the protruding portion 31 extends (hereinafter referred to as the "moving direction"). Can be moved individually. The alligator 27 and the dovetail grooves 28a and 28b have a so-called "alligator dovetail groove" relationship. The two dovetail grooves 28a and 28b have substantially the same shape. The dovetail grooves 28a and 28b are rectangular with a longer direction orthogonal to the groove in a plan view (FIG. 3).

The gap changing device 29 is composed of a gap changing motor 34, a gear box 35, two screws 36, two female screw members 37a and 37b, and the like.
A servo motor is used as the interval changing motor 34 . The rotation axis of the space changing motor 34 is rotated by 90 degrees by the gearbox 35 and connected to one end of the two screws 36 .
Both screws 36 have normal threads on one side of the round bar and reverse threads on the other side. Both screws 36 are screwed into a female screw member 37a having a positive female screw and a female screw member 37b having a reverse screw female screw inside each of the grooves 38, 38 for movement.

The female screw member 37a and the female screw member 37b are each fixed to one of the dovetail grooves 28a and 28b different from each other.
In the interval changing device 29, both the screws 36 are rotated by the interval changing motor 34 to bring the female screw member 37a and the female screw member 37b closer or farther apart. Since the female screw member 37a is fixed to the dovetail groove 28a and the female screw member 37b is fixed to the dovetail groove 28b, the interval between the two dovetail grooves 28a and 28b can be changed by rotating the interval changing motor 34. FIG.

The two dovetail grooves 28a, 28b are restricted from sliding relative to the dovetail 27 by fixing knobs 39, . . . , 39, respectively.
The rod of the rocking prevention clamp 14 in the tilting device 13 described above penetrates the through hole 30 of the sliding portion 26 and presses the lower surface of the stage 11 and the upper surface of the sliding portion 26 in a direction in which they approach each other. Thus, the tilt table 3 is fixed to the stage main body 2 .

The guide wheels 16, 16 in the tilting device 13 are in contact with the curved upper surface of the sliding portion 26, and rotate as the curved upper surface moves when the tilting table 3 is swung (tilted). The two guide wheels 16, 16 have their rotating shafts integrated with the stage 11, and serve to guide the sliding portion 26 so that the tilt table 3 is smoothly oscillated.
The pair of rotating shaft angle changing devices 4a and 4b respectively have rotating devices 41a and 41b, rotating bases 42a and 42b, and the like.

Since the two rotating shaft angle changing devices 4a and 4b have substantially the same structure, one rotating shaft angle changing device 4a will be described.
The rotating device 41a includes a rotating motor 43a, a rotating pinion 44a, a rotating rack 45a, and the like. The rotating motor 43a is a servomotor, and its main body is integrated with the side surface of one dovetail groove 28a with its output shaft facing up. The rotating pinion 44a is attached to the output shaft of the rotating motor 43a.

The rotating rack 45a is an arcuate rack with teeth arranged in an arc. The rotating rack 45a is fixed to the rotating base 42a with its teeth meshing with the rotating pinion 44a.
The rotating table 42a is a rectangular plate-like member, and the rotating rack 45a is fixed to its longitudinal end. The rotating base 42a is integrated on the dovetail groove 28a so as to be rotatable about a rotating shaft 46a with respect to the dovetail groove 28a, with its longitudinal direction approximately aligned with the longitudinal direction of the dovetail groove 28a.

In the rotating device 41a, a rotating motor 43a integrated with the dovetail groove 28a rotates a rotating pinion 44a, and rotates a rotating base 42a having a rotating rack 45a that meshes with the rotating pinion 44a around a rotating shaft 46a.
The structure, function, etc. of the rotating device 41b and the rotating base 42b in the other rotating shaft angle changing device 4b are the same as those in the rotating shaft angle changing device 4a.

A rotating base 42b in the other rotating shaft angle changing device 4b is rotatably integrated on the other dovetail groove 28b by a rotating shaft 46b. Therefore, the pair of rotating shaft angle changing devices 4a and 4b are arranged with an interval in the direction in which the projecting portion 31 of the dovetail 27 extends.
Each of the rotating shafts 46a and 46b is located near the end opposite to the rotating racks 45a and 45b in the longitudinal direction of the rotating bases 42a and 42b, on the side closer to the other rotating bases 42b and 42a. is distributed to That is, the rotating shaft 46a of the rotating shaft angle changing device 4a is arranged on the side closer to the other rotating shaft angle changing device 4b in the vicinity of the longitudinal end of the rotating base 42a.

The rotation axis angle changing device 4a and the rotation axis angle changing device 4b are symmetrical with respect to the vertical plane in terms of the arrangement of their components.
The rotating devices 41a and 41b in the two rotating shaft angle changing devices 4a and 4b operate so that the rotating directions of the respective rotating bases 42a and 42b are opposite to each other. For example, in FIG. 3, when the rotating device 41a rotates the rotating base 42a by −θ degrees in the horizontal direction, the rotating device 41b rotates the rotating base 42b in the horizontal direction by θ degrees.

The rotary bases 42a and 42b are prevented from rotating unnecessarily by a rotary clamp 47 when, for example, polishing is performed while rollers are held thereon.
The pair of roller holding portions 5a and 5b are respectively composed of rollers 51a and 51b and roller rotating devices 52a and 52b. Both of the rollers 51a and 51b have the same shape and size, and are cylindrical in appearance.

The roller 51a in the roller holding portion 5a has its rotation axis aligned with the longitudinal direction of the rotation table 42a, and both sides of the rotation axis are supported by bearings fixed to the rotation table 42a. The roller rotating device 52a is fixed to a bearing near the rotating rack 45a. The roller rotating device 52a is a servomotor, the output shaft of which is connected to the rotating shaft of the roller 51a. The roller rotating device 52a can rotate the roller 51a at an arbitrary number of rotations.

The roller holding portion 5b also has exactly the same structure (bearing 53b, etc.) as that of the roller holding portion 5a.
When the pair of roller holding portions 5a and 5b are viewed from the moving direction of the dovetail grooves 28a and 28b (front view, FIG. 2), the respective rollers 51a and 51b overlap each other.
Next, the operation of the roller support 1 for holding the cylindrical rollers and tapered rollers will be described.

FIG. 5 is a diagram showing how the roller support 1 holds the cylindrical roller W1, and FIG. 6 is a diagram showing the operation of the roller support 1 for holding the cylindrical roller W1.
For example, in a superfinishing device that superfinishes the peripheral surface of a roller, the grindstone oscillates (high-speed fine vibration) in the generatrix direction of the peripheral surface of the roller . Also, the direction of oscillation is substantially horizontal. For this reason, the roller support 1 used in the superfinishing apparatus preferably holds the rollers so that the ridgelines of the rollers are horizontal. Here, the "ridgeline" refers to the contour line of the uppermost portion of the roller held by the roller support 1 when viewed in the horizontal direction perpendicular to the axis. For example, in FIG. 5(b), it is the line marked with "E" at the cylindrical roller W1.

Now, in order to make the ridgeline of the cylindrical roller W1 to be held horizontal, it is necessary to make the rotation axes of the pair of rollers 51a and 51b in the roller support 1 horizontal and parallel (FIG. 5).
6A, in the roller support 1, the tilting motor 21 in the tilting device 13 is operated, and the rotation axes of the rollers 51a and 51b in FIG. Rock the table 3. When the rotating shafts of the rollers 51a and 51b become horizontal, the tilting motor 21 is stopped, and the tilting table 3 is fixed to the stage 11 (stage main body 2) by the rocking prevention clamps 14 and 14. FIG.

Referring to FIG. 6(b), the rotating motors 43a and 43b in the rotating shaft angle changing devices 4a and 4b (rotating devices 41a and 41b) are then operated to rotate the two rollers 51a and 51b in FIG. Rotating bases 42a and 42b (supporting roller holding portions 5a and 5b) are rotated around rotating shafts 46a and 46b until the two rotating shafts are parallel to each other. When the rotation axes of the two rollers 51a and 51b become parallel, the rotation clamps 47 fix the rotation bases 42a and 42b to the dovetail grooves 28a and 28b.

FIG. 7 shows how the roller support 1 holds cylindrical rollers W1a and W1b having different diameters. In FIG. 7, (a) is a plan view of the roller support 1 holding the small diameter cylindrical roller W1a, (b) is a front view of (a), and (c) is the rollers 51a and 51b and the cylindrical rollers of (a). (d) is a right side view of rollers 51a and 51b and cylindrical rollers W1a in (b); and (e) is a right side view when the large diameter cylindrical roller W1b is held in (d). be.

The roller support 1 is formed by changing the distance between the rotation shafts of the two rollers 51a and 51b (from S1 to S2) with respect to the cylindrical rollers W1a and W1b having diameters D1 and D2 of different sizes. can be kept constant (H1+H, H2+H).
The interval between the two rollers 51a and 51b is changed by rotating the two screws 36 by the interval changing motor 34 in the interval changing device 29 and moving the dovetail grooves 28a and 28b closer to each other or away from each other.

In the roller support 1, when the rotating shafts of the pair of cylindrical rollers 51a and 51b are set horizontally, the ridgelines of the rollers 51a and 51b can be changed by changing the interval between the rollers 51a and 51b for various cylindrical rollers having different diameters. It can be held without changing the height.
FIG. 8 shows how the roller support 1 holds tapered rollers W2a and W2b of different sizes. In FIG. 8, (a) is a view of the roller support 1 holding the large tapered rollers W2a viewed obliquely downward (in the direction of the arrow AR in (b)), (b) is a front view of (a), ( c) is a right side view of rollers 51a, 51b and tapered rollers W2a in (a); (d) is a right side view of rollers 51a, 51b and tapered rollers W2a in (b); It is a right side view when tapered roller W2b is held.

For example, in superfinishing, the roller support 1 does not change the height of the grindstone when superfinishing the tapered rollers W2b smaller in size than the tapered rollers W2a that have been processed immediately before. In order to make the height of the ridgeline of the retained tapered roller W2b the same as the height of the ridgeline E of the immediately preceding tapered roller W2a (FIG. 8, H2=H1), the following changes are made.

That is, the two dovetail grooves 28a and 28b are brought close to each other by the space changing device 29 to narrow the space between the roller holding portions 5a and 5b (FIG. 8, S1>S2). Subsequently, the rotating devices 41a and 41b are operated to reduce the angle (extension) of the rotation axes (axial centers) of the two rollers 51a and 51b in plan view (FIG. 8A).
In FIG. 8(e), α1 and α2 do not indicate the angles formed by the rotation axes of the rollers 51a and 51b in a plan view. , the height of the ridgeline E of the tapered roller W2b is the same as that of the immediately preceding large tapered roller W2a.

The roller support 1 has a pair of rollers 51a and 51b, each of which has a cylindrical shape. The tapered rollers W2a and W2b can be held so that the ridge line E becomes horizontal.
The roller support 1 is designed for tapered rollers of different shapes and sizes by adjusting the distance between the two rollers 51a and 51b, the degree of inclination of these rotating shafts with respect to the horizontal plane, and the extension of these rotating shafts (axis centers). ), the height of the ridgeline E can be kept constant.

9 and 10 are diagrams showing how rollers 51Ba, 51Bb and rollers 51Ca, 51Cb of other forms hold tapered rollers W2. 9 and 10, (a) is a front view of this state, (b) is a plan view, and (c) is a right side view.
Rollers 51Ba, 51Bb (FIG. 9), 51Ca, 51Cb (FIG. 10) shown in FIGS. 9 and 10 are cylindrical with different diameters.

In the following description, the same or similar configurations as those of the roller support 1 in the roller support having the rollers 51Ba and 51Bb or the rollers 51Ca and 51Cb are given the same reference numerals as those of the roller support 1.
A roller support having a pair of rollers 51Ba and 51Bb shown in FIG. The roller holding portions 5a and 5b (turning bases 42a and 42b) are also configured to rotate independently of each other.

In the roller support having a pair of rollers 51Ba and 51Bb, the rotation of the holding portions 5a and 5b moves the axis AXr (the ridgeline E in the front view (a)) of the holding tapered rollers W2 in the movement direction of the dovetail grooves 28a and 28b. Different (rotational) angles (α3≠α4) are performed according to the apex angles of the cones in order to make them orthogonal.
The pair of rollers 51Ba and 51Bb are arranged such that the dovetail grooves 28a and 28b are moved by the interval changing device so that the ridge line E of the tapered roller W2 (in plan view (b)) is directly below the superfinishing grindstone, for example. Each is done independently.

A roller support having a pair of rollers 51Ca and 51Cb shown in FIG. In addition to the fact that the rotation of the rollers 5a and 5b can be performed independently of each other, it is possible to perform the tilting with respect to the horizontal performed by the tilting device 13 on the roller support 1 separately for each of the two rollers 51Ca and 51Cb.

In order to separately tilt the rollers 51Ca and 51Cb with respect to the horizontal, a "goniostage" as in the roller support 1 is provided for each. The attitudes of the rollers 51Ca and 51Cb are changed by separate tilting devices, interval changing moving devices, and rotating devices, respectively.
Since the rollers 51Ca and 51Cb can have the same attitude as the rollers 51Ba and 51Bb shown in FIG. 9, the range of tapered rollers that can be held is wider than that of the rollers 51Ba and 51Bb.

When the respective pairs of rollers 51a, 51b, 51Ba, 51Bb, 51Ca, 51Cb hold the tapered rollers, the extensions of their rotation axes (axial centers) intersect when viewed from above. Also, when the extensions of the rotation shafts of the pair of rollers 51a, 51b, 51Ba, 51Bb, 51Ca, and 51Cb intersect, the side where the extensions of the two rotation shafts intersect is higher than the other side.

In the above-described embodiment, the roller support, each configuration of the roller support, or the overall structure, shape, size, number, material, etc., can be appropriately changed in line with the gist of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used to hold rollers when polishing the surface of a workpiece having a circular cross section with a centerless (centerless) polishing apparatus or the like.

1 roller support 13 tilting device 29 interval changing device 41a, 41b rotating device 51a, 51b, 51Ba, 51Bb, 51Ca, 51Cb roller AXa, AXb roller axis W2, W2a, W2b tapered roller

Claims (5)

A roller support for holding an object to be polished in a centerless polishing apparatus,
a pair of rollers having a cylindrical appearance and rotatable arranged thereon so as to hold the object to be polished;
rotation for rotating the pair of rollers in opposite directions so that when the pair of rollers is viewed from above, extensions on one side of the respective axes intersect or are parallel to each other a device;
and a tilting device that changes the tilt of the rollers so that the side where the extension of the axial center intersects is higher than the other side when viewed from the direction in which the pair of rollers are arranged, or both sides are horizontal. ,
The tilting device comprises a tilting motor, a tilting pinion rotated by the tilting motor, and a tilting rack meshed with the tilting pinion and swinging integrally with the roller,
A roller support , wherein said tilting motor is a servomotor . provided with a gap changing device for changing the gap between the pair of rollers
A roller support according to claim 1 . 3. The roller support according to claim 2, wherein the tilting device is configured so that the pair of rollers always have the same tilt . The pair of rollers have the same diameter,
4. The roller support according to claim 2, wherein the rotating device is configured such that the absolute values of the rotating angles of the pair of rollers in opposite directions are the same. 5. The roller support according to any one of claims 2 to 4 , wherein the interval changing device is configured to move the pair of rollers in opposite directions and to have the same movement distance.

Images