JP2003071685A - Method of machining integral power roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of machining an integral power roller for a toroidal continuously variable transmission, improving the productivity thereof. SOLUTION: Center holes 11 and 12 are previously machined in both end faces of a large diameter portion 111 and a small diameter portion 114 of the integral power roller 1. A spindle center 21 of a grinder is inserted into the center hole 11 and a tail center 52 is pushed against the center hole 12 to keep the integral power roller rotatable. With the integral power roller 1 being rotated by rotating the spindle center 21, a grinding wheel 55 being rotated is made to approach in the direction perpendicular to the rotating shaft of the integral power roller 1 for grinding the large diameter portion 111, a plane portion 12, a medium diameter portion 113 and the small diameter portion 114, in sequence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of processing an integrated power roller used in a toroidal type continuously variable transmission, which is a combination of a power roller and a pivot shaft.

[0002]

2. Description of the Related Art Toroidal type continuously variable transmissions are disclosed, for example, in Japanese Unexamined Patent Publication Nos. 07-286649 and 2001-328.
Some are disclosed in Japanese Patent Publication No. 99 and the like.

A power roller is one of the important members of the toroidal type continuously variable transmission disclosed in these documents.

In the conventional power roller, since the power roller and the pivot shaft connected to the power roller are manufactured separately, a process for connecting the power roller and the pivot shaft is required after processing.

By the way, it is an important issue to reduce the manufacturing cost of each such component. Therefore, since both the power roller and the pivot shaft are processed by rotary grinding using a lathe, etc., by integrating them into a shaft-shaped product with a different thickness, the manufacturing cost can be improved efficiently. Can be reduced. Such an integrated power roller and pivot shaft is referred to herein as an "integrated power roller".

As shown in FIG. 5, the integrated power roller has a large diameter portion 111, a flat surface portion 112 perpendicular to the outer peripheral surface of the large diameter portion 111, and an outer peripheral surface perpendicular to the flat surface portion 111. The medium diameter portion 113 has a smaller diameter than the portion 111, and the small diameter portion 114 has a smaller diameter than the medium diameter portion 113. The large diameter portion 111 and the flat portion 112 correspond to the conventional power roller, and the medium diameter portion 113 and the small diameter portion 114 correspond to the conventional pivot shaft.

As a processing method of such an integrated power roller, for example, as shown in FIG. 5, when performing rough processing of the integrated power roller, one side of the integrated power roller 101 is provided with a discarding boss 102 in advance. On the other hand, the center hole 103 is provided on the other side, and the discarding boss 102 is clamped by the chuck 51 attached to the spindle of the grinder, and the tailing center 52 is pressed against the center hole 103 to hold it rotatably.

Then, while rotating the integrated power roller 101 with a waste boss fixed by the chuck 51 by a grinding machine, the rotating grindstone 55 is brought close to the direction of the rotation axis of the integrated power roller to form an integrated type. Large diameter portion 111, flat portion 112, and medium diameter portion 11 of the power roller 101
3 and the small diameter portion 114 are sequentially ground.

Further, as a conventional processing method when such a waste boss is not used, as shown in FIG. 6A, first, the middle diameter portion 113 or the small diameter portion 114 is clamped by the chuck 53. The large-diameter portion 111 was ground by the grindstone 55, and then the integrated power roller 101 was transferred to another grinder as shown in FIG. 6B and processed by the large chuck 54. Large diameter part 111
Clamp the flat surface 112 and the medium diameter portion 1 with the grindstone 56.
13 and the small diameter portion 114 may be ground.

[0010]

However, in such a conventional method of processing an integral type power roller,
In the former method of using the discard boss, it is necessary to finally provide an unnecessary discard boss portion in advance,
There is a problem that the utilization efficiency of the raw material is poor, and a step of scraping off the waste boss portion is required after the processing, resulting in poor productivity.

Further, as in the latter case, instead of using the discarding boss, the medium diameter portion, the small diameter portion and the large diameter portion are clamped separately, and the unclamped portions are machined. Despite integrating the and the pivot shaft, it is necessary to re-clamp the integrated power roller when processing a large diameter part and when processing a medium diameter part or a small diameter part. There is a problem that the integration of the and pivot shafts does not lead to the shortening and efficiency of the machining process.

Therefore, an object of the present invention is to provide a processing method of an integrated power roller which can process from a large diameter portion to a small diameter portion by one-time clamping without providing an unnecessary portion such as a waste boss. That is.

[0013]

The object of the present invention is achieved by the following constitutions.

(1) A method of processing an integrated power roller in which a power roller and a pivot shaft used in a toroidal type continuously variable transmission are integrated, wherein the integrated power roller is sandwiched between a spindle center and a tailstock center. Stages,
Rotating the integrated power roller by rotating the spindle center, bringing a rotating grindstone closer to the integrated power roller, and grinding the integrated power roller. And the method of processing the integrated power roller.

(2) The step of performing the grinding process is characterized in that the grinding process is carried out so as to satisfy the condition shown in the following expression (1).

F <2 · μ · F · (r ′ / r) · sin (θ / 2) · cos (θ / 2) (1) However, in the formula (1), f = P / V, P : Power required for grinding, V: Grinding wheel peripheral speed, f: Tangent grinding resistance between the grinding wheel outer peripheral portion and the surface to be ground, μ: Friction resistance at the contact portion between the spindle center and the center hole of the integrated power roller, F: Pressing force between the spindle center and the centering center, r: radius of the processed part, r ':
Radius of a portion in contact with the spindle center, θ: vertical angle of the spindle center.

(3) A method of processing an integrated power roller in which a power roller used in a toroidal type continuously variable transmission and a pivot shaft are integrated, wherein the integrated power roller is sandwiched between a spindle center and a tailstock center. Stages,
A step of pressing a rotation fixing tool provided on the outer periphery of the spindle center against the inclined surface portion, and at least the rotation fixing, Rotating the integrated power roller by rotating the tool, bringing the rotating grindstone closer to the integrated power roller, and grinding the integrated power roller. Processing method of integrated power roller.

(4) In the grinding step, a thick disk is formed, and an outer peripheral grindstone surface that is flat in the thickness direction on the outer peripheral portion of the disk and a flat surface that is perpendicular to the outer peripheral grindstone surface. Using a grindstone having a side grindstone surface, the outer peripheral grindstone surface is used to grind a large-diameter portion of the integrated power roller, and then the side grindstone surface is perpendicular to the outer peripheral surface of the large-diameter portion. It is characterized in that the flat surface portion is ground, and subsequently, the medium diameter portion having a smaller diameter than the large diameter portion and the small diameter portion having a smaller diameter than the large diameter portion are ground by the outer peripheral grindstone surface.

(5) The step of grinding is a thick disk shape, and the outer peripheral surface of the disk is flat in the thickness direction and the outer peripheral surface is flat and perpendicular to the outer peripheral surface. A grindstone head having a first grindstone having a side grindstone surface and a second grindstone having a thick disk shape and having an arcuate grindstone surface in the thickness direction at an outer peripheral portion of the disk. By using the outer peripheral grindstone surface of the first grindstone to grind a large diameter portion of the integrated power roller, and then the side grindstone surface to grind a flat surface portion perpendicular to the outer peripheral surface of the large diameter portion. Then, the step of grinding the medium diameter portion having a smaller diameter than the large diameter portion and the small diameter portion having a smaller diameter than the large diameter portion by the outer peripheral grindstone surface,
Grinding the flat surface portion by the arc-shaped grindstone surface of the second grindstone to form a thrust ball bearing portion.

(6) The step of grinding is a thick disk shape, and the outer peripheral surface of the disk is flat in the thickness direction and the outer peripheral surface is flat and perpendicular to the outer peripheral surface. A first attachment having a first grindstone provided with a side grindstone surface, and a second grindstone having a thick disk shape and having an arc-shaped grindstone surface in the thickness direction at an outer peripheral portion of the disk. Second attachment having a flat surface and a third attachment having a flat grindstone surface
And a third attachment having a grindstone, and while rotating the integrated power roller, the large diameter portion of the integrated power roller is ground by the outer peripheral grindstone surface using the first attachment. Then, the flat surface portion perpendicular to the outer peripheral surface of the large-diameter portion is ground by the side grindstone surface, and subsequently, the medium-diameter portion and the medium-diameter portion having a smaller diameter than the large-diameter portion by the outer peripheral grindstone surface. The step of grinding a small diameter part having a smaller diameter than the part, and rotating the integrated power roller,
Grinding the flat surface portion by using the second attachment to form a thrust ball bearing portion, stopping rotation of the integral power roller, and using the third attachment, the large diameter portion And a step of grinding an inclined surface portion inclined from the outer peripheral surface at a predetermined angle and facing the flat surface portion.

(7) The step of grinding is a thick disk shape, and the outer peripheral surface of the disk is flat in the thickness direction and the outer peripheral surface is flat and perpendicular to the outer peripheral surface. A first attachment having a first grindstone provided with a side grindstone surface, and a second grindstone having a thick disk shape and having an arc-shaped grindstone surface in the thickness direction at an outer peripheral portion of the disk. Second attachment having a flat surface and a third attachment having a flat grindstone surface
And a third attachment having a grindstone, and the large-diameter portion of the integral power roller is ground by the outer peripheral grindstone surface using the first attachment while rotating the integral power roller. Then, the flat surface portion perpendicular to the outer peripheral surface of the large-diameter portion is ground by the side grindstone surface, and subsequently, the medium-diameter portion and the medium-diameter portion having a smaller diameter than the large-diameter portion by the outer peripheral grindstone surface. The step of grinding a small diameter part having a smaller diameter than the part, and rotating the integrated power roller,
Grinding the flat surface portion to form the thrust ball bearing portion using the second attachment, and rotating the integral power roller by retracting the rotation fixing tool from the slope portion of the integral power roller. And the step of grinding the slope portion using the third attachment.

[0022]

The present invention has the following effects for each claim.

According to the first aspect of the present invention, the integral power roller is sandwiched between the spindle center and the tailstock center for grinding processing. Since it is not necessary to provide the, the utilization efficiency of the material is improved. In addition, since there is no need to chuck a part of the machined part unlike the conventional case when the discarding boss is not provided, it becomes possible to machine the pivot shaft part and the power roller part sequentially and continuously. Since productivity is improved and continuous machining is possible without removing each time the machining site is changed, it is possible to mold the integrated power roller with good machining accuracy for each part. Furthermore, since a driving means such as a kelet or a dock for rotating the integrated power roller to be processed is not required, the structure of the processing device can be simplified.

According to the second aspect of the present invention, since the grinding is performed so as to satisfy the above expression (1), slippage between the integrated type power roller and the spindle center during processing is prevented, and the grinding stone is used. An accurate frictional force with the surface to be ground can be generated to reliably perform grinding.

According to the third aspect of the present invention, the integrated power roller is sandwiched between the spindle center and the tailstock center, and is pressed against the inclined surface portion of the integrated power roller for processing the rotation fixing tool, and the rotation is performed. Since the integrated power roller processed by the fixing tool is rotated, the integrated power roller being processed can be surely rotated by the rotation fixing tool, and the rotation fixing tool is the part that becomes the pivot shaft or the power roller. Since it does not affect the parts to be formed, it becomes possible to continuously process these parts, and it is possible to form an accurate integrated power roller. Further, unlike the conventional case, it is not necessary to previously provide the integrated power roller with the discarding boss, so that the utilization efficiency of the material is improved.

According to the fourth aspect of the present invention, once the integrated power roller is sandwiched, the large diameter portion, the flat surface portion, the medium diameter portion, and the small diameter portion are continuously processed.
It is possible to perform processing in which the large-diameter portion, the medium-diameter portion, and the small-diameter portion have excellent concentricity, and the large-diameter portion and the flat portion, and the flatness and the squareness of the medium-diameter portion and the small-diameter portion are excellent.

According to the present invention as set forth in claim 5, an outer peripheral grindstone surface which is disk-shaped with a thickness and which is flat in the thickness direction on the outer peripheral portion of the disk, and a side grindstone which is perpendicular to the outer peripheral grindstone surface. Processing using a grindstone head having a first grindstone having a surface and a second grindstone having a thick disk shape and having an arc-shaped grindstone surface in the thickness direction at the outer peripheral portion of the disk. Therefore, after continuously machining the large diameter portion, the flat surface portion, the medium diameter portion, and the small diameter portion with the first grindstone, the thrust ball bearing portion is continuously treated with the second grindstone without removing the integrated power roller. Since it can also be processed, the productivity including the processing of the thrust ball bearing portion is improved.

According to the present invention described in claims 6 and 7,
As an attachment, a first disk-shaped attachment having a thick disk shape and having a flat outer peripheral wheel surface in the outer peripheral portion of the disk in the thickness direction and a flat side wheel surface perpendicular to the outer peripheral wheel surface. No. 2, which has a thick disc shape, and is provided with an arc-shaped grindstone surface in the thickness direction at the outer peripheral portion of the disc.
One having a grindstone of No. 3 and one having a third grindstone having a flat grindstone surface are prepared respectively, and once the integrated power roller is sandwiched, a large diameter portion, a flat surface portion, a medium diameter portion, and a small diameter portion are provided. Part is processed by the first attachment provided with the first grindstone, and subsequently is replaced with the second attachment provided with the second grindstone to carry out the machining of the thrust ball bearing part. Since it is supposed to process the slope part by replacing it with a third attachment equipped with a grindstone, once the integrated power roller is sandwiched, each part is processed successively without removing it until the slope part is processed. Therefore, it is possible to perform processing with excellent shape accuracy and position accuracy.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In each drawing, members having the same functions as those shown in FIG. 5 described as the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

(First Embodiment) FIG. 1 is a view for explaining a method of processing an integrated power roller according to a first embodiment of the present invention, and FIG. 1 (a) is a side view. It is a figure and Drawing 1 (b) is a sectional view which meets the AA line shown in Drawing 1 (a).

According to this processing method, the large-diameter portion 111 and the small-diameter portion 11 are preliminarily used when the integral type power roller 1 is roughly processed.
Center holes 11 and 12 are machined on both end surfaces of 4,
The spindle center 21 installed on the grinder is inserted into the center hole 11 on the end surface side of the large diameter portion, while the centering center 52 is pressed against the center hole 12 on the end surface side of the small diameter portion, so that the integrated power roller 1 is mounted. Hold rotatably.

In this state, the spindle center 21 is rotated by a drive source (not shown) to rotate the integrated power roller 1, and the motor (not shown) in the grindstone head 50 is rotated to rotate the grindstone 30. The large diameter portion 111 and the flat surface portion 11 are brought close to each other in the direction orthogonal to the rotation axis of the power roller 1.
2. The medium diameter portion 113, the small diameter portion 114, etc. are sequentially ground. The grindstone 30 used in the present embodiment
Is a thick disk-shaped outer peripheral part grinding wheel surface 32a and outer peripheral part grinding wheel surface 32a which are flat in the thickness direction at the outer peripheral part of this disk.
And a side grindstone surface 32b which is perpendicular to and flat with respect to. Therefore, the large-diameter portion 11 is formed by the outer peripheral grindstone surface 32a.
1, the medium diameter part 113 and the small diameter part 114 can be ground, and the flat surface part 12 can be ground by the side grindstone surface 32b.

In the first embodiment, as described above, the integral power roller 1 is rotated only by the spindle center 21, so that it is compared with the conventional chuck. Then, when the grindstone 30 is pressed against the integrated power roller 1, the spindle center 21 and the center hole 11 are more likely to slip.

Therefore, in this embodiment, in order to prevent this slip, the condition shown in the following equation (1) is satisfied.

F <2 · μ · F · (r ′ / r) · sin (θ / 2) · cos (θ / 2) (1) where, in the formula, f is the outer peripheral portion of the grindstone and the surface to be ground. Tangential grinding resistance of, μ: Friction resistance of the contact part between the spindle center and the center hole of the integrated power roller, F: Pressing force between the spindle center and the centering center (pressing force between the center and the centering center), r : Radius of the processed portion, r ': radius of a portion in contact with the spindle center, θ: vertical angle of the spindle center.

In order to satisfy the condition shown in the equation (1), it is necessary to simply increase the tailing thrust F, but there is a limit in increasing the tailing thrust F.

Therefore, if the power required for grinding is P and the peripheral velocity of the grindstone is V, there is a relation of P = fV (2). Therefore, if equation (2) is transformed, f = P / V (( 3) Here, if the power P required for grinding is set to a certain constant value, the tangential grinding resistance f between the outer peripheral portion of the grindstone and the surface to be ground becomes smaller by increasing the peripheral speed V of the grindstone from the formula (3), and It becomes possible to satisfy the expression (1).

Therefore, in the present embodiment, the peripheral velocity V of the grindstone is set so as to satisfy the above expression (1).

As a result, once the roughened one-piece power roller 1 is set without slippage between the spindle center 21 and the center hole 11 on the end surface on the large diameter portion side, the large diameter portion is sequentially set. 111, plane part 112, medium diameter part, 11
It is possible to grind 3 and the small diameter portion 114 with one grindstone 30.

Therefore, since the discarding boss portion for clamping the integrated power roller is not formed or a part of the integrated power roller is not clamped, the utilization efficiency of the material is high and the working process The number can be reduced and the manufacturing cost can be reduced.

In addition, in order to satisfy the above expression (1), the cutting speed of the grindstone (the traveling speed in the direction orthogonal to the rotation axis of the integrated power roller) and the feed speed (of the integrated power roller). It is also possible to reduce the tangential grinding resistance f between the outer peripheral portion of the grindstone and the surface to be ground by slowing the traveling speed in the rotation axis direction) or slowing the rotation speed of the integrated power roller 1. However, when the cutting speed of the grindstone is slowed down or the rotation speed of the integrated power roller 1 is slowed down, the grinding time becomes long. Therefore, it is better to increase the rotation speed of the grindstone 30 as described above. It is preferable because it has high properties.

Further, the number of grindstones is not limited to one, and a plurality of grindstones may be used depending on the processed portion. Even in such a case, since the integrated power roller 1 needs to be set once only by exchanging the grindstone, the productivity is improved as compared with the conventional case.

(Second Embodiment) FIG. 2 is a view for explaining a method of processing an integrated power roller according to a second embodiment of the present invention.

In the processing method of the integrated power roller in the second embodiment, first, the integrated power roller 1 is set in the same manner as in the first embodiment described above. That is, the integrated power roller 1 in which the center holes 11 and 12 are preliminarily processed on both end surfaces of the large diameter portion and the small diameter portion,
It is clamped by a spindle center 21 and a centering center 52 installed on a grinding machine.

In the second embodiment, the first grindstone 32 for continuously processing from the large diameter portion 111 to the small diameter portion 114 is used as a processing machine for grinding.
Then, the second grinding wheel 34 for processing the thrust ball bearing portion 115 in the large diameter portion is processed by the processing machine having the grinding wheel head 2 rotatably provided.

The first grindstone 32 is in the shape of a thick disk, and the outer peripheral grindstone surface 32a that is flat in the thickness direction on the outer peripheral portion of this disk and the side grindstone that is perpendicular to the outer peripheral grindstone surface 32a. Surface 32b.

The second grindstone 34 is in the shape of a thick disk, and the grindstone surface 34 is arcuate in the thickness direction at the outer peripheral portion of the disk.
a.

The first grindstone 32 is rotationally driven by the motor 31. Similarly, the second grindstone 34 is also rotationally driven by the motor 33.

The grindstone head 2 is formed by connecting motor boxes accommodating these motors in mutually opposite directions.

As shown in FIG. 2A, the processing method using the grindstone head 2 is as follows. First, as shown in FIG. 2A, the integrated power roller 1 is rotated by the spindle center 21, and the first grindstone 32 is used to rotate the integrated power roller 1. The large diameter portion 111, the flat surface portion 112, the medium diameter portion 113, and the small diameter portion 114 of the roller 1 are continuously ground. At this time, the large diameter portion 111 and the medium diameter portion 11
3, and the small-diameter portion 114 is the outer peripheral surface of the grindstone 32.
2a is ground, and the flat surface portion 112 is ground by the side grindstone surface 32b of the grindstone 32.

Subsequently, as shown in FIG. 2B, the grindstone head 2 is rotated by 90 degrees, and the second grindstone 34 is previously ground on the flat surface of the second grindstone 34 while the integral type power roller 1 is rotated. Part 1
12, and the inside of this portion is ground so as to form the thrust ball bearing portion 115.

As a result, the large-diameter portion 111 to the small-diameter portion 114 of the integrated power roller 1 are continuously machined, and the thrust ball bearing portion 115 is also machined continuously in one process and in one machine. Since it can be processed by a machine, productivity can be improved and the number of required equipment can be reduced.

Further, since a single processing machine processes a plurality of parts at the same time, no positional deviation occurs due to attachment and detachment of the work piece. And the shape accuracy such as the squareness of the shaft is improved.

(Third Embodiment) FIG. 3 is a drawing for explaining a method of processing an integrated power roller according to a third embodiment of the present invention. Note that, in FIG. 3, FIGS. 3 (a1), (b), (c), and (d) are side views, and FIG. 3 (a2) is from a direction along arrow A shown in FIG. 3 (a1). It is the top view seen.

The processing method of the integrated power roller in the third embodiment is as follows. First, as shown in FIGS. 3 (a1) and 3 (a2).
As shown in, the integrated power roller 1 is set in the same manner as in the above-described first embodiment. That is, the integrated power roller 1 in which the center holes 11 and 12 are preliminarily machined on the end faces of the large diameter part and the small diameter part is sandwiched by the spindle center 21 and the centering center 52 installed on the grinder. At this time, the difference from the first embodiment is that
The thrust force of the centering force applied by the spindle center 21 and the centering center 52 may be any amount as long as it is a force that rotatably holds the integrated power roller 1.

After that, as shown in FIG. 3B, the rotation fixing tool 23 attached to the outer peripheral side of the spindle center 21.
3 relative to the spindle center 21,
As shown in (c), the slope portion 1 of the integrated power roller 1
Press on 16.

The rotating fixture 23 has an inclined surface 24 which is in contact with the inclined surface portion 116 of the integrated power roller 1 and has an inclined surface 24 which is inclined in accordance with the inclined surface portion 116, and rotates together with the spindle center 21. At the time of this rotation, since the inclined surface 24 is in contact with the inclined surface portion 116 of the integrated power roller 1, the integrated power roller 1 and the spindle center 21 are
And the necessary rotational force is transmitted to the integrated power roller 1.

After that, as shown in FIG. 3D, the grindstone 30 attached to the grindstone head 50 is rotated in the direction orthogonal to the rotation axis of the integral power roller 1 while rotating the integral power roller 1. The large-diameter portion 111, the flat surface portion 112, the medium-diameter portion 113, the small-diameter portion 114, and the like are sequentially brought into close proximity and ground.

According to the third embodiment, the rotation of the integrated power roller is held by the rotation fixing tool having the inclined surface corresponding to the inclined surface portion of the integrated power roller.
Even if the discarding boss is provided or a part of the integrated power roller is chucked, it is possible to reliably maintain the rotation of the integrated power roller without doing anything.

As a result, it is possible to continuously process from the large diameter portion to the small diameter portion, and it is possible to easily improve the coaxiality, the squareness and the like.

Further, since the inclined surface of the rotary fixing device is pressed against the inclined surface portion of the integrated power roller, the position is forced with reference to the inclined surface portion of the integrated power roller. The shape accuracy and the position accuracy of the machined part with respect to the slope part are improved.

In the third embodiment, the spindle center 21 is rotated together with the rotation fixing tool 23, but this causes unnecessary friction between the spindle center 21 and the center hole 11 of the integrated power roller. It is for avoiding. Therefore, the tip of the spindle center 21 and the center hole 11
If the friction of the spindle can be reduced, the spindle center 2
1 does not need to rotate with rotary fixture 23.

In the third embodiment, the grindstone 30 is used for grinding, but instead of this, the second embodiment described above is applied, and the first grindstone 3 is used.
The grindstone head 2 having the second and second grindstones 34 may be used to grind from the large diameter portion 111 to the small diameter portion 114, and then to grind the thrust ball bearing portion 115.

(Fourth Embodiment) FIG. 4 is a drawing for explaining a method of processing an integrated power roller according to a fourth embodiment of the present invention.

In the processing method of the integrated power roller in the fourth embodiment, first, the integrated power roller 1 is clamped by the spindle center 21 and the centering center 52 as in the first embodiment described above. To do.

Then, in the fourth embodiment, three types of attachments having different grindstone shapes are prepared in order to perform the grinding process.

The first attachment 41 is shown in FIG.
As shown in FIG. 3, the outer peripheral surface of the whetstone surface 32a and the outer peripheral surface whetstone surface 32a are flat and have a flat shape in the thickness direction.
With a side grindstone surface 32b that is perpendicular to and flat with respect to the first
The grindstone 32 is provided.

The second attachment 42 is shown in FIG.
As shown in FIG. 3, a second grindstone 34 having a thick disk shape and having an arcuate grindstone surface 34a in the thickness direction is provided on the outer peripheral portion thereof.

The third attachment 43 is shown in FIG.
As shown in, the front surface 36a is provided with a grindstone 36 having a flat surface.

Further, each attachment is provided with a connecting portion 45 for attaching to the tip of the robot arm, for example, and a motor 46 for rotating the grindstone.

To process the integrated power roller 1, first, as shown in FIG. 4A, for example, a first attachment 41 is attached to the tip of a robot arm, and is clamped between the spindle center 21 and the centering center 52. While rotating the integrated power roller 1 by the spindle center 21, the first grinding wheel 32 continuously grinds the large diameter portion 111, the flat surface portion 112, the medium diameter portion 113, and the small diameter portion 114 of the integrated power roller 1. To process.

Subsequently, as shown in FIG. 4B, the attachment is replaced with the second attachment 42, and while the integral type power roller 1 is rotated by the spindle center 21, the second grindstone 34 is moved forward. Plane part 11 ground to
2, and the inside of this portion is ground to form the thrust ball bearing portion 115.

Subsequently, as shown in FIG. 4C, the attachment is replaced with the third attachment 43, the rotation of the spindle center 21 is stopped and the brake is applied, and the integrated power roller 1 is fixed, and The slope portion 116 is ground by the grindstone 36 of No. 3.

As described above, in the fourth embodiment, attachments having different grindstone shapes are prepared, and once the integral power roller is set, thereafter, the large diameter portion to the small diameter portion of the integral power roller are set. , Thrust ball bearing,
And the slope portion can be continuously processed only by replacing the prepared attachment. Therefore,
Since it is not necessary to reset the integrated power roller every time the processing portion is changed, the productivity of the integrated power roller is improved.

In the fourth embodiment, as shown in FIG. 4, the integrated power roller is sandwiched between the spindle center 21 and the centering center 52.
Instead of this, as in the third embodiment described above, the integrated power roller 1 may be fixed and rotated by a rotation fixing tool. In this case, when the slope portion 116 is ground by the third attachment 43, the rotary fixing tool is retracted before processing.

[Brief description of drawings]

FIG. 1 is a drawing for explaining a method of processing an integrated power roller according to a first embodiment of the present invention.

FIG. 2 is a drawing for explaining a method for processing an integrated power roller according to a second embodiment of the present invention.

FIG. 3 is a drawing for explaining a method for processing an integrated power roller according to a third embodiment of the present invention.

FIG. 4 is a drawing for explaining a method of processing the integrated power roller according to the fourth embodiment of the present invention.

FIG. 5 is a view showing a conventional method for processing an integrated power roller.

FIG. 6 is a drawing showing a conventional method for processing an integrated power roller.

[Explanation of symbols]

1. Integral power roller 2, 50 ... Whetstone head 11, 12 ... Center hole 21 ... Spindle center 23 ... Rotating fixture 24 ... Inclined surface 30, 55, 56 ... Whetstone 31, 33 ... Motor 32 ... 1st whetstone 32a ... Peripheral whetstone surface 32b ... Side grindstone surface 34 ... second whetstone 36 ... Third whetstone 36a ... Front 41 ... first attachment 42 ... Second attachment 43 ... Third attachment 45 ... Connection part 46 ... Motor 51, 53, 54 ... Chuck 52 ... Centering center 30, 55, 56 ... Whetstone 102 ... Discard boss 103 ... Center hole 111 ... Large diameter part 112 ... Plane 113 ... Medium diameter part 114 ... Small diameter part 115 ... Thrust ball bearing 116 ... Slope

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Minoru Ota             Nissan, Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan             Inside the automobile corporation F-term (reference) 3C043 AA10 CC03 CC04 CC13                 3J051 AA03 BA03 BE09

Claims (7)

[Claims] 1. A method of processing an integrated power roller used in a toroidal type continuously variable transmission, comprising an integrated power roller and pivot shaft, wherein the integrated power roller is sandwiched between a spindle center and a tailstock center. And rotating the integrated power roller by rotating the spindle center, bringing a rotating grindstone closer to the integrated power roller, and grinding the integrated power roller. A method for processing an integrated power roller, characterized by: 2. The method of processing an integrated power roller according to claim 1, wherein the step of grinding is performed so as to satisfy a condition represented by the following formula (1). f <2 · μ · F · (r ′ / r) · sin (θ / 2) · cos (θ / 2) (1) However, in the formula (1), f = P / V, P: for grinding Required power, V: grinding wheel peripheral speed, f: tangential grinding resistance between the grinding wheel outer peripheral part and the surface to be ground, μ: frictional contact resistance between the spindle center and the center hole of the integrated power roller, F: spindle center Pressing force between centering centers, r: radius of processed part, r ':
Radius of a portion in contact with the spindle center, θ: vertical angle of the spindle center. 3. A method of processing an integrated power roller in which a power roller used in a toroidal type continuously variable transmission and a pivot shaft are integrated, wherein the integrated power roller is sandwiched between a spindle center and a tailstock center. And a step of pressing a rotation fixing tool provided on the outer circumference of the spindle center against the inclined surface portion, the inclined surface being inclined in accordance with the inclined surface portion formed in advance on the integrated power roller, Rotating the rotating power tool to rotate the integrated power roller, bringing a rotating grindstone closer to the integrated power roller, and grinding the integrated power roller. And the method of processing the integrated power roller. 4. The step of grinding is a thick disk shape, and an outer peripheral grindstone surface that is flat in the thickness direction on the outer peripheral part of the disk and a flat side that is perpendicular to the outer peripheral grindstone surface. Using a grindstone with a partial grindstone surface, the outer peripheral grindstone surface is used to grind a large-diameter portion of the integrated power roller, and subsequently the side grindstone surface is a plane perpendicular to the outer peripheral surface of the large-diameter portion. 4. A portion is ground, and subsequently, a medium diameter portion having a diameter smaller than the large diameter portion and a small diameter portion having a diameter smaller than the medium diameter portion are ground by the outer peripheral grindstone surface. The method for processing the integrated power roller according to any one of the above. 5. The step of performing the grinding step is a thick disk shape, and an outer peripheral grindstone surface that is flat in the thickness direction on the outer peripheral part of the disk and a flat side that is perpendicular to the outer peripheral grindstone surface. Using a grindstone head having a first grindstone having a partial grindstone surface and a second grindstone having a thick disk shape and having an arc-shaped grindstone surface in the thickness direction at an outer peripheral portion of the disk Then, the large diameter portion of the integrated power roller is ground by the outer peripheral surface of the first grindstone, and then the flat surface portion perpendicular to the outer peripheral surface of the large diameter portion is ground by the side grinding wheel surface. Next, a step of grinding a medium-diameter portion having a smaller diameter than the large-diameter portion and a small-diameter portion having a smaller diameter than the medium-diameter portion by the outer peripheral grindstone surface, and the arc-shaped grindstone surface of the second grindstone Forming a thrust ball bearing portion by grinding the flat surface portion by means of Method for processing integrated power roller according to any one of claims 1 to 3. 6. The step of grinding is a disk having a thickness, and an outer peripheral grindstone surface that is flat in the thickness direction on the outer peripheral part of the disk and a flat side that is perpendicular to the outer peripheral grindstone surface. A first attachment having a first grindstone provided with a partial grindstone surface, and a second grindstone having a thick disc shape and having an arc-shaped grindstone surface in the thickness direction at the outer peripheral portion of the disc. A second attachment having and a third attachment having a third grindstone having a flat grindstone surface are prepared, and the outer circumference is obtained by using the first attachment while rotating the integral power roller. Grinding the large diameter portion of the integrated power roller by the part grindstone surface, and then grinding the flat surface portion perpendicular to the outer peripheral surface of the large diameter portion by the side grindstone surface,
Subsequently, a step of grinding a medium-diameter portion having a smaller diameter than the large-diameter portion and a small-diameter portion having a smaller diameter than the large-diameter portion by the outer peripheral grindstone surface, and rotating the integrated power roller, Grinding the flat surface portion by using the second attachment to form the thrust ball bearing portion, and stopping the rotation of the integrated power roller, and using the third attachment, the outer circumference of the large diameter portion. 3. A method of processing an integrated power roller according to claim 1, further comprising: grinding an inclined surface portion that is inclined at a predetermined angle from the surface and faces the flat surface portion. 7. The step of grinding is a thick disk shape, and an outer peripheral grindstone surface that is flat in the thickness direction on the outer peripheral portion of the disk and a flat side that is perpendicular to the outer peripheral grindstone surface. A first attachment having a first grindstone provided with a partial grindstone surface, and a second grindstone having a thick disc shape and having an arc-shaped grindstone surface in the thickness direction at the outer peripheral portion of the disc. A second attachment having and a third attachment having a third grindstone having a flat grindstone surface are prepared, and the outer circumference is obtained by using the first attachment while rotating the integrated power roller. Grinding the large diameter portion of the integrated power roller by the part grindstone surface, and then grinding the flat surface portion perpendicular to the outer peripheral surface of the large diameter portion by the side grindstone surface,
Subsequently, a step of grinding a medium-diameter portion having a smaller diameter than the large-diameter portion and a small-diameter portion having a smaller diameter than the large-diameter portion by the outer peripheral grindstone surface, and rotating the integrated power roller, Using the attachment of No. 2 to grind the flat surface portion to form the thrust ball bearing portion; and to stop the rotation of the integral power roller by retracting the rotation fixing tool from the slope portion of the integral power roller. And a step of grinding the sloped portion using the third attachment. 4. The method for processing an integrated power roller according to claim 3, further comprising: