JP3215343B2 - Centerless grinding machine and centerless grinding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centerless grinding apparatus and a centerless grinding method therefor, and more particularly, to a short rotating body having a non-cylindrical outer diameter surface, in particular, a rotary body having a pair of conical surfaces. The present invention relates to an infeed type centerless grinding technique for performing grinding on an outer diameter surface of a tapered roller.

[0002]

2. Description of the Related Art A scroll type compressor is a kind of rotary compressor, which is small in size, has no valve mechanism, and has continuous fluid compression. Low vibration and high-speed operation,
In recent years, practical application has been actively promoted.

[0003] By the way, this type of compressor is provided with a thrust force support structure which enables the scroll drive. This support structure constitutes a kind of thrust bearing, and a sphere such as a steel ball is used as a rolling element. In such a sphere, since the supporting state is point contact, high-speed long-term There was a problem that the durability was poor in use.

In this regard, recently, as shown in FIG. 9A, a scroll compressor having a thrust force support structure has been proposed (for example, Japanese Utility Model Laid-Open No. 61-82086, Japanese Unexamined Patent Publication No. 62-107284, etc.).

The basic structure of this compressor is as shown in the figure.
In the housing a, a fixed scroll member c having a spiral body b is fixed, and a revolving scroll member e having a spiral body d meshing with the spiral body b is supported by a thrust force support structure f so as to be capable of turning or revolving. The orbiting scroll member e is drivingly connected to a driving source (not shown) via a crank pin g.

The support structure f is in the form of a type of thrust bearing as described above, and a plurality of recesses h and i are provided on the inner surface of the housing a and the opposing surface of the revolving scroll member e, respectively, and These recesses h, i
A bi-conical rolling element (bi-conical roller) W is interposed so as to be able to roll.

[0007] By the rotation of the crank pin g, the revolving scroll member e is turned into the stationary scroll member c.
The fluid gas sucked from the suction port j is revolved without rotating, and compressed by the compression chamber formed between the spiral bodies b and d, and then discharged from the discharge port k. Have been.

In this case, as shown in the schematic diagram of FIG. 9 (b), the outer peripheral surfaces Wa and Wb of the double tapered roller W have concave portions h and i.
The rolling motion is performed in a line contact state with the flat bottom surfaces m and n, and the durability is remarkably improved as compared with the conventional rolling element made of a sphere, and it can withstand long-term use at high speed. There is an advantage of gaining.

[Problems to be solved by the invention]

However, in spite of having such excellent durability, the scroll type compressor having such a thrust force supporting structure f has not been established with the grinding technology of the double tapered roller W. For this reason, the fact is that it has not yet been put to practical use.

That is, the double conical roller W is an abacus spherical bearing element in which the upper and lower outer peripheral surfaces Wa and Wb have a conical shape as shown in the figure, and the both conical surfaces Wa and Wb are subjected to high-precision grinding. In addition to the demands, it is necessary to secure mass productivity as a machine element at the same time.However, there is no grinding technology that can satisfy both of these conditions, and mass production of inexpensive and highly accurate double tapered roller W is not possible. It was possible.

[0011] This problem is not limited to the above-mentioned double tapered rollers, but is common to all rotating bodies having a short non-cylindrical outer diameter surface which require high finishing accuracy and have mass productivity.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to use a centerless grinding technique having high processing accuracy and high processing efficiency to achieve non-cylindrical outer grinding. It is an object of the present invention to provide a centerless grinding machine capable of manufacturing a double-tapered roller, which is a short rotating body having a radial surface, at low cost and with high finishing accuracy.

[0013]

In order to achieve the above object, a centerless grinding machine according to the present invention performs centerless grinding by infeed on both conical surfaces of a tapered roller rotatably supported at a grinding position. A grinding wheel having a grinding wheel surface with a profile matching the conical surfaces of the tapered rollers, an adjusting wheel having a rotating support surface with a profile matching the conical surfaces of the tapered rollers, an axis of the grinding wheel and a rotation center of the tapered rollers A blade having a support surface that supports both conical surfaces of the tapered rollers so that the axes are parallel to each other, and a rotary dresser having a dresser surface having a profile corresponding to the grinding surface of the grinding wheel and the rotating support surface of the adjustment wheel. It is characterized by comprising.

In a preferred embodiment, the dressing apparatus for dressing the grinding wheel surface of the grinding wheel and the rotating support surface of the adjusting wheel comprises a single rotary dresser for dressing both the grinding wheel surface and the rotating support surface. Be prepared.

The centerless grinding method of the present invention is a method of grinding a double tapered roller using the centerless grinding machine. It is characterized in that centerless grinding is performed by infeed without adjusting the feed angle of the adjusting wheel.

Here, "without a feed angle" means that the feed angle of the adjustment wheel is substantially 0 °, whereby
It means a state in which axial thrust does not act on the double tapered rollers during grinding.

In a preferred embodiment, the grinding wheel and the adjusting wheel are dressed to a predetermined profile by a single rotary dresser while their axial positions are regulated. An adjusting wheel grinds the conical surfaces of the conical rollers that are rotatably supported at the grinding position.

In the present invention, for example, a plurality of double conical rollers are carried together into a grinding position, and are supported by an adjusting wheel and a blade in an axially aligned state. The outer diameter surface (both conical surfaces) is simultaneously ground by a grinding wheel.

In this case, the grinding wheel surface of the grinding wheel and the rotating support surface of the adjusting wheel have a profile corresponding to the two conical surfaces of the tapered rollers, and the supporting surface of the blade is formed by the two conical surfaces of the tapered rollers. Is supported so that its rotation center axis is parallel to the axis of the grinding wheel, and the feed angle of the adjusting wheel is 0 °, and no axial thrust acts on the double conical rollers. The rollers are ground at a time with a stable alignment state without falling down or the like and a plurality of them are collectively ground. As a result, a large number of double tapered rollers can be mass-produced continuously and automatically, and the production cost by mass production can be significantly reduced.

The dressing is performed on the grinding wheel surface of the grinding wheel and the rotation support surface of the adjustment wheel at appropriate intervals. The dressing is performed by using the grinding wheel surface of the grinding wheel and the rotation support surface of the adjustment wheel. By using a dressing device with a rotary dresser having a dresser surface with a profile corresponding to the above, sharpening and correction of the grinding wheel surface and the rotation support surface are accurately performed despite the complicated profile, and the grinding wheel and There is no relative axial displacement of the adjusting wheel, and the axial positioning of both is ensured.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

A centerless grinding machine according to the present invention is shown in FIGS. Specifically, the centerless grinding machine collectively includes a plurality of (three in the illustrated example) double tapered rollers (work pieces) W as shown in FIG. Conical surface (outer surface) W
a and Wb are simultaneously ground by an in-feed (feeding) grinding method, and are mainly composed of a grinding wheel 1, an adjusting wheel 2, a blade 3, a loader device 4, a dressing device 5, and a control device 6. .

The double tapered roller as the workpiece W has an angle between the upper and lower vertices, that is, a cone angle θ of 90 ° in the front shape shown in FIG.
The intersection angle of Wb is also set to 90 °.

The grinding wheel 1 grinds the outer diameter surface of the workpieces W, W,..., And the rotating spindle 10 has a conventionally known general basic structure and is provided on an apparatus bed 11. While being rotatably mounted on the grinding wheel chassis 12,
It is linked to a drive source such as a drive motor (not shown). Further, the grinding wheel platform 12 is reciprocally movable in the cutting feed direction X along a slide rail 13 a on a slide base 13 provided on the apparatus bed 11, and is linked to a feed screw device 14. This feed screw device 14
Is a mechanism for moving the grinding wheel platform 12, and a feed screw mechanism 1 such as a ball screw which is linked to the grinding wheel chassis 12 so as to be able to advance and retreat.
4a, and a servomotor 14b that rotationally drives the feed screw mechanism 14a. This servo motor 14b is
It is arranged on the slide base 13 and is electrically connected to the control device 6.

The adjusting wheel 2 rotatably supports the outer diameter surfaces of the workpieces W, W,...
Similarly to the above, it has a conventionally known general basic structure, is rotatably mounted on an adjustment chassis 22 provided on the device bed 11, and is linked to a drive source such as a drive motor (not shown). The adjustment chassis 22 is reciprocally movable in the cutting and feeding direction X along a slide rail 23 a on a slide base 23 provided on the apparatus bed 11, and is linked to a feed screw device 24.
The feed screw device 24 moves the adjustment chassis 22, and includes a feed screw mechanism 24 a such as a ball screw that is linked to the adjustment chassis 22 so as to be able to advance and retreat, and the feed screw mechanism 24 a
And a servo motor 24b for rotationally driving the motor. The servo motor 24b is arranged on the slide base 23 and is electrically connected to the control device 6.

The feed angle (inclination angle) of the adjusting wheel 2, that is, the inclination angle of the rotary spindle 20 can be adjusted. However, this angle is set to substantially 0 °. Are configured so that no axial thrust acts on the workpieces W, W,.

The blade 3 supports the lower part of the outer diameter surface of the workpieces W, W,... And is fixed on a work rest 30 provided on the apparatus bed 11. The work rest 30 is moved to the grinding position A by the position switching device 50.
And a machining standby position B, and are arranged to be selectively operated with the dressing device 5, that is, disposed at the grinding position A as described later.

The grindstone surface 1a of the grinding wheel 1, the rotating support surface 2a of the adjusting wheel 2 and the support surface 3a of the blade 3 are conical surfaces Wa, W of three works W, W, W aligned in the axial direction.
b, Wa, Wb, and Wa, Wb.

Specifically, as shown in FIG. 3, the grinding wheel surface 1a of the grinding wheel 1 is composed of three grinding surfaces 31, 31, 31 arranged at regular intervals.
Has a V-shaped profile (cross-sectional contour shape) corresponding to the finished shape dimensions of the both conical surfaces Wa and Wb of the workpiece W.

The size of the V-shaped ground surface is set so that the whole of the two conical surfaces Wa and Wb can be ground. In other words, V forming the grinding surface 31
The U-shaped groove has both side walls forming an intersection angle θ of 90 ° similarly to the above-mentioned both conical surfaces Wa and Wb of the work W, and the depth dimension H is the maximum finish radius of the work W,
That is, the radius is set to be larger than the radius of the intersection of the two conical surfaces Wa and Wb.

The rotation support surface 2a of the adjusting wheel 2 is composed of three rotation support portions 32, 32, 32 disposed opposite to the grinding surfaces 31, 31, 31 of the grinding wheel 1, respectively. The part 32 is provided with two conical surfaces Wa, W of the workpiece W.
b is provided with a profile for rotatably supporting a part of b.

More specifically, as shown in FIG.
Are integrated in a laminated manner via spacer disks 34, respectively, and the rotating support plates 33, 33 are supported by the edge surfaces 33a, 33b of the adjacent adjustment disks 33, 33. The unit 32 is configured. These edge surfaces 33
a and 33b are configured to form part of an annular groove having the same profile as the grinding surface 31 of the opposed grinding wheel 1. The outer diameter of the spacer disk 34 between the both end surfaces 33a and 33b is such that its outer peripheral surface is
The workpiece W is set so as not to contact the workpiece W supported by the workpieces 33a and 33b. With such a configuration, even if the conical surfaces Wa, Wb of the work W are deformed as the grinding process proceeds, the both end surfaces 33a, 33b are always stable and the conical surfaces Wa, Wb of the work W are always stable. Wb is rotatably supported.

The support surface 3a of the blade 3 is provided with three support surfaces 35, 35 which are respectively opposed to the grinding surfaces 31, 31, 31 of the grinding wheel 1 and the rotating support portions 32, 32, 32 of the adjusting wheel 2. , 35, and each support surface 35 is
The work W is provided with a profile corresponding to a part of the two conical surfaces Wa, Wb, and the two conical surfaces Wa, Wb of the work W are arranged such that the rotation center axis thereof is parallel to the axis of the rotating main shaft 10 of the grinding wheel 1. To support.

Specifically, as shown in FIG. 4, the blade 3 is mounted on a work rest 30 in an upright manner.
The upper end surface of the blade member 36, 36, 36 serves as the support surface 35 having a profile corresponding to the two conical surfaces Wa, Wb of the work W.

That is, the support surface 35 has a V-shaped profile corresponding to the finished shape of the conical surfaces Wa and Wb of the work W, that is, along the ridge line of the conical surfaces Wa and Wb. It is in the form of a V-shaped inclined groove that supports the lower part of the surfaces Wa and Wb. Accordingly, even if the two conical surfaces Wa and Wb of the work W are deformed as the grinding process proceeds, the support surface 35 keeps the two conical surfaces Wa and Wb stable at all times, and the rotation center axis of the work W is shifted. The grinding wheel 1 is supported so as to be parallel to the axis of the rotating spindle 10.

The loader device 4 includes a rotary support surface 2a of the adjusting wheel 2 and a support surface 3 of the blade 3 at the grinding position A.
The three workpieces W, W, W are loaded or unloaded simultaneously or continuously with respect to a, and are disposed above the grinding position A. Although a specific configuration of the loader device 4 is not shown, a chuck portion for chucking the work W can be moved between a work supply unit (not shown) and the grinding position A by a moving unit. At the same time, a conventionally known chucking structure such as an air chuck is employed for the chuck portion. The driving sources of the chuck unit and the moving unit are constituted by an electric driving source, and are electrically connected to the control device 6.

Further, the loader device 4 has an upper blade 37 (see FIG. 3) that supports the upper portions of the three conical surfaces Wa, Wb,. 2). Although the specific configuration of the support surface of the upper blade 37 is not shown,
In addition to having the same structure as the support surface 3a of the blade 3, the work W, W, the two conical surfaces Wa, Wb,... Of the work W are also used. And the like can be effectively prevented from rising.

The dressing device 5 applies dressing to both the grinding wheel surface 1a of the grinding wheel 1 and the rotating support surface 2a of the adjusting wheel 2, and as shown in FIGS. The motor 41 is provided as a main part.

The rotary dresser 40 has a profile corresponding to the grinding wheel surface 1a and the rotation supporting surface 2a described above, that is, a plane as shown in FIG. It has a cross-sectional profile that fits.

More specifically, the rotary dresser 40 is formed by integrally forming three dressing portions 40a, 40a, 40a in the form of a so-called abacus ball and a support shaft portion 40b. This dressing part 4
0a has a dressing surface substantially matching the ground surface 31 of the grinding wheel surface 1a, in other words, has a shape similar to the work W. In addition, the support shaft portion 40b is configured such that the dressing portions 40a, 40a, 40a have the grinding surface 3 of the grinding wheel 1.
1,31,31 have an outer diameter dimension such that their outer diameter surfaces substantially match the cylindrical surfaces 45,45,... Adjacent thereto.

As shown in FIGS. 5 and 6, the rotary shaft 40b of the rotary dresser 40 is
6 is rotatably supported in a horizontal state, and is linked to the drive motor 41. This drive motor 41
Is specifically composed of a servomotor, is disposed on the dresser base 46, and its rotating shaft is coaxially connected to the support shaft portion 40b of the rotary dresser 40,
It is electrically connected to the control device 6.

As shown in FIG. 7, the rotary dresser 40 simultaneously or simultaneously rotates the grinding wheel surface 1a of the grinding wheel 1 and the rotation support surface 2a of the adjusting wheel 2 by rotating the servo motor 41. Although not shown, dressing is performed individually.

The dressing device 5 is configured to be selectively operated with the blade 3 by the position switching device 50, that is, to be disposed at the grinding position A.

The position switching device 50 includes a slide base 5
1 and the feed screw device 52 as main parts.
The slide base 51 can be moved on a position switching base 55 provided on the apparatus bed 11 between the grinding wheel 1 and the adjustment wheel 2. Specifically, on the position switching base 55, a slide rail 56 extends in a horizontal direction orthogonal to the cutting feed direction X, that is, a direction Y substantially parallel to the axis of the grinding wheel 1 and the adjustment wheel 2. The slide base 51 can reciprocate on this.

The slide base 51 includes a feed screw device 52
The work rest 30 supporting the blade 3 and a dresser base 46 of the dressing device 5 are arranged side by side at a predetermined interval. In this case, the axis of the work W supported on the blade 3 and the axis of the rotary dresser 40 of the dressing device 5 are set so as to be located substantially on the same horizontal plane. Also,
The heights of the axis of the workpiece W and the axis of the rotary dresser 40 are set to be the same as those of the grinding wheel 1 and the adjusting wheel 2 in the illustrated example.

The feed screw device 52 moves the slide base 51. As shown in FIGS. 5 and 6, the feed screw device 52 includes a feed screw mechanism 52a such as a ball screw which is linked to the slide base 51 so as to be able to advance and retreat. And a servo motor 52b for rotating the feed screw mechanism 52a. The servo motor 52b is disposed on the position switching base 55 and is electrically connected to the control device 6.

Then, by driving the feed screw device 52,
The slide base 51 reciprocates in the Y direction within a predetermined range, and the blade 3 moves between the grinding position A and the processing standby position B, while the rotary dresser 40 moves between the dressing standby position C and the grinding position. A, and the blades 3 are respectively switched.
And the rotary dresser 40 are selectively arranged in an operating state (grinding position A).

The control device 6 includes the grinding wheel 1, the adjusting wheel 2,
Each drive source (servo motors 14b, 24b, 4) of the loader device 4, the dressing device 5, and the position switching device 50
1, 52b) are automatically controlled in conjunction with each other. Specifically, the CPU, ROM, RAM, and I / O
It is a CNC device composed of a microcomputer including a port and the like. In the control device 6, a control program for executing a grinding process described below is selectively and appropriately set as numerical control data in advance by a keyboard or the like of an operation panel (not shown).

Next, a description will be given of the grinding and dressing process in the centerless grinding machine as described above.

A. Grinding process: As shown in FIG. 5, the three works W, W, W are put together by the loader device 4 (see FIG. 1) in a state where the blade 3 is positioned at the grinding position A as shown in FIG. Then, it is loaded and placed at the grinding position A. At this time, the rotary dresser 40 is at the dressing standby position C. Further, the upper blade 37 of the loader device 4 supports the conical surfaces Wa, Wb,... Of the three loaded works W, W, W from above (see FIG. 2).

In this state, while the grinding wheel 1 and the adjusting wheel 2 are rotationally driven, the grinding wheel 1 is cut into the workpieces W, W, and W relatively to be cut and fed, and the outer diameter surface of the workpiece W is ground. (See FIGS. 1 to 3).

In this case, the center axes of rotation of the works W, W, W are supported so as to be parallel to the axis of the grinding wheel 1, and the feed angle of the adjusting wheel 2 is 0 °.
No axial thrust acts on W. Also, at this time, the cutting wheel of the grinding wheel 1 is cut and fed with the position of the grinding wheel 1 and the blade 3 constant, or the wheel of the adjusting wheel 2 is fixed and the position of the blade 3 and the adjusting wheel 2 is constant. The car 1 is cut and fed.

When the grinding of the workpieces W, W, W is completed, the cutting feed of the grinding wheel 1 relative to the workpieces W, W, W is stopped and retreated, and the upper blade 3
After the support by 7 is released, these three works W, W, W are carried out and removed from the grinding position A by the loader device 4. Returning to the above, the following steps are repeated.

B. Dressing process: When the above grinding process is repeated, the grinding wheel surface 1a of the grinding wheel 1 and the adjusting wheel 2
Since the rotating support surface 2a is blinded, clogged, or worn, the following dressing step is executed at predetermined intervals between the above-mentioned grinding steps.

As shown in FIG. 6, the rotary dresser 40 of the dressing device 5 is moved by the position switching device 50.
Is positioned at the grinding position A, and the blade 3 is moved to the processing standby position B and is on standby.

In this state, the rotary dresser 40 is rotationally driven, and while the grinding wheel 1 and the adjusting wheel 2 are rotationally driven, the rotary dresser 40 is cut and fed to the rotary dresser 40 with its axial position regulated. , Grinding wheel 1
Is dressed on the grinding wheel surface 1a and the rotation support surface 2a of the adjusting wheel 2 (see FIG. 7).

The dressing system in this case is the grinding wheel 1
And the adjusting wheel 2 are simultaneously cut and fed, and the grinding wheel surface 1a and the rotating support surface 2a are simultaneously dressed. Alternatively, the grinding wheel 1 and the adjusting wheel 2 are sequentially cut and fed separately, and the grinding wheel surface 1a and the rotating supporting surface are separated. 2a is separately and independently dressed.

In particular, as in the former, the grinding wheel 1 and the adjusting wheel 2
It has been found from tests and studies by the inventors that when dressing is performed simultaneously, clogging of the rotary dresser 40 is effectively prevented and efficient dressing is performed.

That is, when only the rotary support surface 2a of the adjusting wheel 2 is dressed by the rotary dresser 40, since the viscosity of the binder of the abrasive grains constituting the rotary support surface 2a is relatively high and soft, the rotary dresser is soft. The 40 dressing surfaces are easily clogged. On the other hand, if the grinding wheel surface 1a of the grinding wheel 1 is also dressed at the same time, the dressing of the rotary dresser is effected by the abrasive grains or the like on the grinding wheel 1 side, and the effect of preventing the clogging comes out. It has been experimentally found that jamming is effectively prevented and dressing performance is improved.

Thus, in the present embodiment, the grinding wheel surface 1a (grinding surfaces 31, 31, 31) of the grinding wheel 1 and the rotation support surface 2a (rotation support portions 32, 32, 32) of the adjusting wheel 2 are used.
Are the three conical surfaces W of three aligned works W, W, W
a, Wb,... and a support surface 3a (support surfaces 35, 35, 35,
35), the rotation center axis of the workpiece W, W, W is the grinding wheel 1
So that both conical surfaces Wa, Wb,
, And further, since the adjusting wheel 2 is not provided with a feed angle, each workpiece W,
W and W are always ground in a stable alignment without falling down despite relatively short dimensions.

As a result, the three conical rollers W, W, W are ground simultaneously and with high processing accuracy, and a large number of works W, W,... Are continuously and automatically processed with high processing accuracy. Mass production processing is also possible, and a large reduction in manufacturing cost is realized by a large amount of processing of the double tapered roller W, which has been impossible in the past.

The double tapered roller W thus manufactured
9 is preferably applied as a component for a thrust force support structure in a scroll compressor as shown in FIG. 9A, for example, and the outer peripheral surfaces Wa and Wb of the double tapered rollers W are formed as shown in FIG.
As shown in (b), the rolling motion is performed in line contact with the flat bottom surfaces m and n of the concave portions h and i. As a result,
Compared to the conventional scroll type compressor using a rolling element consisting of a sphere for the above-mentioned support structure, the durability is remarkably improved, and furthermore, the characteristics by the scroll drive (less torque fluctuation and vibration, high speed operation is possible) It is possible to put a scroll-type compression machine that can be used without difficulty to practical use.

As described above, the dressing is performed on the grinding wheel surface 1a of the grinding wheel 1 and the rotation support surface 2a of the adjusting wheel 2 at appropriate intervals. And the dressing device 5 provided with a single rotary dresser 40 having a profile corresponding to the rotating support surface 2a, so that the sharpening / correction of the grinding wheel surface 1a and the rotating support surface 2a can be performed despite the complicated profile. The grinding wheel 1 and the adjusting wheel 2 are not displaced relative to each other in the axial direction, and the axial positioning of the two wheels 1 and 2 is ensured. Further, in this way, the grinding performed by using the grinding wheel 1 and the adjustment wheel 2 dressed by the single rotary dresser 40 can realize higher processing accuracy.

The above-described embodiments merely show preferred embodiments of the present invention, and the present invention is not limited to these embodiments, and various design changes can be made within the scope. As an example, the following modifications can be considered.

(1) The specific structures of the adjusting wheel 2 and the blade 3 are not limited to the structures shown in the figure, and other structures having the same function can be adopted.

(2) Adjusting wheel 2 and blade 3 and grinding wheel 1
Relative to the workpiece W, for example, the method of cutting and feeding the grinding wheel 1 relative to the workpiece W is not limited to the illustrated one, and a conventionally well-known method can be appropriately adopted.

That is, in the drawing, the blade 3 is fixed and the grinding wheel 1 and the adjusting wheel 2 are movable in the cutting feed direction X. In addition, the grinding wheel 1 and the blade 3 Can be moved as a unit,
The blade 3 and the blade 3 can be integrally moved, and various methods can be adopted according to the purpose.

(3) In the illustrated embodiment, the grinding wheel 1 and the adjusting wheel 2 are dressed by a single dressing device 5, but it is a matter of course that the grinding wheel 1 and the adjusting wheel 2 may each be provided with a dedicated dressing device.

(4) The dressing device 5 is arranged on the device bed 11 as shown in the figure to secure the rigidity of the arrangement, and when the grinding wheel 1 is fixed, the dressing device 5 is mounted on the grinding wheel cover as conventionally known. It is also possible to arrange in.

(5) In addition to the double tapered rollers as in the above-described embodiment, the target workpiece W may have another non-cylindrical outer diameter surface, that is, an outer surface whose diameter continuously changes linearly in the axial direction. A straight cylindrical surface such as a radial surface (tapered surface), an outer diameter surface that changes continuously in a curved shape in the axial direction, a stepped outer diameter surface that changes discontinuously, or an outer diameter surface that is a combination of these. A short rotating body having an outer diameter surface of a rotating body other than the above may be used. For example, a workpiece W as shown in FIGS. 10 and 11 can be ground.

That is, in FIG. 10, the outer diameter surface Wc of the work W has a convex arc-shaped contour, and in FIG. 11, the outer diameter surface Wc of the work W is formed by combining two concave arcs and a straight line. It has a contour. Correspondingly, in any case, the grinding wheel surface 1a of the grinding wheel 1 and the rotation support surface 2 of the adjusting wheel 2
a and the support surface 3a (not shown) of the blade 3 are arranged on the outer diameter surfaces W of three works W, W, W aligned in the axial direction.
c, Wc, and a profile suitable for Wc.

(6) In the illustrated embodiment, the three workpieces W, W, and W are structured to be collectively ground. However, the number of workpieces W to be processed can be appropriately increased or decreased according to the purpose. Of course.

[0073]

As described above, according to the present invention,
A grinding wheel having a grinding surface with a profile corresponding to the conical surfaces of the tapered rollers, an adjusting wheel having a rotating support surface with a profile corresponding to the conical surfaces of the tapered rollers, an axis of the grinding wheel and a rotation center of the tapered rollers So that the axes are parallel,
The tapered roller includes a blade having a support surface that supports both conical surfaces of the tapered rollers, and a rotary dresser having a dresser surface having a profile corresponding to the grinding surface of the grinding wheel and the rotating support surface of the adjusting wheel. Despite its short dimensions (the length in the axial direction is relatively smaller than the outer diameter), grinding is performed with stable alignment even when grinding multiple pieces at the same time without falling down. Becomes As a result, a large number of double tapered rollers can be mass-produced continuously and automatically, and the production cost by mass-production can be significantly reduced.

Therefore, the centerless grinding technology can be applied to the double-cone roller, which is a typical work having high finishing accuracy (surface roughness, roundness, etc.) and mass productivity, and has high machining accuracy. And high-efficiency grinding.
A large number of double tapered rollers can be mass-produced continuously and automatically. As a result, a large reduction in the manufacturing cost can be realized by a large amount of processing of the double tapered roller, which has been impossible in the past.

Therefore, a thrust force support structure having the double tapered rollers as a component, and a scroll type compressor having this support structure and having much improved durability as compared with the prior art, can be put to practical use. became.

The dressing for the grinding wheel surface of the grinding wheel and the rotating support surface of the adjusting wheel is performed by a single rotary dresser having a profile corresponding to the grinding wheel surface of the grinding wheel and the rotating supporting surface of the adjusting wheel. The sharpening / correction of the grinding wheel surface and the rotating support surface is performed accurately in spite of its complicated profile. As a result, there is no relative axial displacement between the grinding wheel and the adjusting wheel, and the two can be adjusted. The positioning in the axial direction is reliable, and the work setup time for loading and unloading the work and dressing can be shortened, and mass production can be performed by automating the work setup, thereby reducing the equipment cost.

[Brief description of the drawings]

FIG. 1 is a front view showing a centerless grinding machine according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a main part of the centerless grinding machine, partially cut away.

FIG. 3 is an enlarged plan view showing a main part of the centerless grinding machine, showing a state in which three double tapered rollers are ground.

FIG. 4 is an enlarged side view showing a main part of the centerless grinding machine, showing a state in which three double tapered rollers are ground.

FIG. 5 is a side view showing the entire main part of the centerless grinding machine, showing a state where the blade is at a grinding position.

FIG. 6 is a side view showing the entire main part of the centerless grinding machine, showing a state in which the dressing device is at a grinding position.

FIG. 7 is an enlarged plan view showing a main part of the centerless grinding machine, showing a state in which the grinding wheel and the adjusting wheel are simultaneously dressed by a single rotary dresser.

8A and 8B are views showing a double conical roller to be ground by the centerless grinding machine, wherein FIG. 8A is a front view and FIG. 8B is a plan view.

FIG. 9 (a) is a front sectional view showing a scroll type compressor having the double conical rollers as a component, and FIG. 9 (b) is a rolling motion state of the double conical rollers in the scroll type compressor. FIG.

FIG. 10 is a view corresponding to FIG. 3 showing a modified example in which another short rotating body having a non-cylindrical outer diameter surface is ground by the centerless grinding machine.

FIG. 11 is a view corresponding to FIG. 3 showing another modified example in which another short rotating body having a non-cylindrical outer diameter surface is ground by the centerless grinding machine.

[Explanation of symbols]

 W Double conical roller (work) Wa, Wb Double conical surface (outer diameter surface) X Cutting feed direction A Grinding position 1 Grinding wheel 1a Grinding wheel surface of grinding wheel 2 Adjusting wheel 2a Rotary support surface of adjusting wheel 3 Blade 3a Blade Support surface 4 loader device 5 dressing device 6 control device 30 work rest 37 upper blade 40 rotary dresser 50 position switching device

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B24B 5/24 B24B 5/18 B24B 53/053 B24B 53/06

Claims (7)

(57) [Claims] 1. An in-feed centerless grinding of both conical surfaces of a tapered roller rotatably supported at a grinding position, wherein the grinding wheel has a grinding wheel surface having a profile corresponding to the conical surfaces of the tapered rollers. An adjusting wheel having a rotating support surface having a profile corresponding to the conical surfaces of the tapered rollers; and a supporting surface for supporting the conical surfaces of the tapered rollers such that the axis of the grinding wheel and the rotation center axis of the tapered rollers are parallel to each other. And a rotary dresser having a dresser surface having a profile corresponding to the grinding wheel surface of the grinding wheel and the rotating support surface of the adjusting wheel. 2. The centerless grinding machine according to claim 1, further comprising a dresser device including a single rotary dresser for dressing a grinding wheel surface of the grinding wheel and a rotation support surface of an adjustment wheel. . 3. The centerless grinding according to claim 1, wherein the support surface of the blade has a V-shaped profile along a ridge line of the conical surfaces of the conical rollers. Board. 4. A centerless grinding in which two conical surfaces of a plurality of double conical rollers rotatably supported at a grinding position are in-feed, wherein a grindstone surface of the grinding wheel, a rotation supporting surface of an adjusting wheel and a blade. 4. The support surface according to claim 1, wherein the support surface has a profile corresponding to both conical surfaces of the plurality of double conical rollers aligned in the rotation center axis direction. Centerless grinding machine. 5. A loader device for loading and unloading tapered rollers to and from the grinding position, and a control device for controlling the driving sources of the grinding wheel, the adjusting wheel, the loader device, and the dresser device in conjunction with each other. The centerless grinding machine according to any one of claims 1 to 4, comprising: 6. A method of grinding a double conical roller using the centerless grinding machine according to claim 1, wherein the double conical roller is rotatably supported at the grinding position. A centerless grinding method characterized in that a surface is subjected to in-feed centerless grinding without providing a feed angle of the adjusting wheel. 7. A single rotary dresser dresses the grinding wheel and the adjusting wheel to a predetermined profile in a state where their axial positions are regulated, and the dressing wheel and the adjusting wheel are
7. The centerless grinding method according to claim 6, wherein the conical surfaces of the conical rollers rotatably supported at the grinding position are ground.