JP2000107947A - Cylindrical surface machining device, bearing bore machining device and structure with cylindrical hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working precision of a cylindrical surface such as cylindricity and surface roughness by specifying the taper ratio of the tapered surface of a rotating member to the tapered surface of a tapered roller. SOLUTION: The tapered roller 2 of a punishing jig obtains a rotating force from a taper pin 7 and revolves around the inside surface of a sleeve 8 while rotating on its own axis within a guide groove. The tapered roller 2 rotates while pressing the inside surface over the whole length of the sleeve 8. Therefore, the bore of the sleeve 8 is extended over the whole axial length of the sleeve 8, and machined with a satisfactory surface roughness. Since the taper ratio of the taper pin 7 to the tapered roller 2 of the punishing jig is set to 2:1, the diameter dimension of the circumscribed circle of the tapered roller extending over the whole length of the sleeve 8 is constant, so that the machining extending over the whole length of the sleeve 8 can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cylindricity of a cylindrical surface,
The present invention relates to a cylindrical surface processing device capable of processing surface roughness and the like with high accuracy, and also relates to a bearing inner diameter processing device for performing high-precision plastic working of the inner diameter of a bearing sleeve, and is further provided with a cylindrical hole having uniform surface roughness. It is about a structure.

[0002]

2. Description of the Related Art Conventionally, a finishing process using plastic working of a bearing inner diameter is applied to a method called pin sizing in which a pin is pushed through, and a method called roller burnishing in which a roller as shown in FIGS. Etc. are known. An example of a conventional bearing inner diameter processing device using the roller burnishing will be described.

FIG. 7 is a sectional view of a conventional bearing machining apparatus, and FIG.
FIG. 8 is a sectional view taken along line BB in FIG. 7. As shown in FIGS. 7 and 8, in the conventional bearing inner diameter processing device, a tapered roller 22 is rotatably fitted in a plurality of guide grooves 21 a of a roller guide 21. A burnishing jig 24 is constituted by the roller guide 21 and the tapered roller 22. The burnishing jig 24 processes the sleeve 23 to be processed.

[0004] The operation of the bearing inner diameter machining apparatus configured as described above will be described below. First, when the sleeve 23 is set on a processing table (not shown), the burnishing jig 24 descends toward the inner diameter of the sleeve 23 while rotating from above. At this time, burnishing jig 2
4 is designed such that the tangent diameter of the plurality of tapered rollers 22 is larger than the inner diameter of the sleeve 23 by several micrometers to several tens of micrometers, and the sleeve 2 rotates while rotating.
By pushing through the inside diameter of No. 3, plastic deformation occurs in the sleeve 23, and almost necessary inside diameter dimensions and surface roughness can be obtained.

However, the above configuration has the following problems. That is, when plastic working is performed, as shown in FIG. 9, both ends of the hole are easily deformed, so that the average inner diameter always changes, that is, the cylindricity δ in the figure becomes a drum-shaped inner diameter shape of several microns. There was a tendency. Also, if there is a variation of, for example, 20 μm in the inner diameter of the sleeve 23 before the plastic working, a variation of 10 to 15 μm remains after the plastic working.
The sliding bearing using such a sleeve has a large radial runout and a large performance variation in mass production.

[0006] As a bearing bore machining apparatus for reducing such variation in the bore size, Japanese Patent Application Laid-Open No. 4-3741 is disclosed.
No. 8 is known.

In this bearing inner diameter processing apparatus, the inner diameter of the bearing is plastically processed using three motors. The first motor has a function of inserting the roller guide and the roller into the sleeve, the second motor has a function of rotating either the sleeve or the roller guide, and the third motor has an axial It has the function of giving relative movement. In the bearing inner diameter processing device having these functions, the inner diameter of the bearing is performed by plastic working called roller burnishing.

[0008]

However, the bearing inner diameter machining apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 4-37418 is intended to finish the entire length of the inner diameter of the sleeve by inserting a processing tool little by little. Since the diameter of the circumscribed circle of the roller is changed based on the value, there is a problem that the sleeve inner diameter cannot be simultaneously processed over the entire length.

In addition, a conventional bearing processing device shown in FIG.
The bearing inner diameter machining apparatus described in Japanese Patent Application Laid-Open No. 4-37418 has the following problems. Since the entire length of the inner diameter of the sleeve is completed by gradually inserting a burnishing jig composed of the roller guide and the tapered roller, irregularities corresponding to the feed pitch P of the burnishing jig are formed on the inner peripheral surface of the sleeve, as shown in FIG. There was a problem that occurs.

[0010] An object of the present invention is to provide a cylindrical surface processing apparatus capable of processing a cylindrical surface with a high degree of precision, such as cylindricity and surface roughness, by plastic working and simultaneously processing the cylindrical surface over its entire length. Is to do.

It is another object of the present invention to provide a bearing capable of working with high precision by plastic working the working accuracy of the inner diameter of the sleeve of the bearing, such as cylindricity and surface roughness, and simultaneously working the sleeve inner diameter over the entire length. It is to provide an inner diameter processing device.

[0012]

According to a first aspect of the present invention, there is provided an apparatus for processing a cylindrical surface, comprising: a rotating member having a tapered surface coaxially opposed to the cylindrical surface; A plurality of tapered rollers that perform planetary motion by being pressed against the cylindrical surface and the tapered surface of the rotating member,
The taper ratio between the tapered surface of the rotating member and the tapered surface of the tapered roller is 2: 1. In this configuration, the taper ratio between the tapered surface of the rotating member and the tapered roller is set to 2: 1. The diameter can be changed.

According to a second aspect of the present invention, there is provided a bearing inner diameter machining apparatus for machining an inner diameter of a bearing sleeve, wherein the taper pin is inserted into the sleeve and a plurality of tapers having a taper capable of rolling around the outer periphery of the taper pin. Roller, a roller guide provided rotatably on the outer periphery of the tapered pin, and having a guide groove for accommodating the plurality of tapered rollers; and providing the taper pin relative to the roller guide by axially moving the tapered pin relative to the roller guide. It has a first motor for inserting a taper pin into a sleeve and a second motor for rotating the taper pin, wherein a taper ratio between the taper pin and the tapered roller is 2: 1. In this configuration, the taper ratio between the tapered pin and the tapered roller is set to 2: 1. Therefore, it is possible to change the circumscribed circle diameter while maintaining the same diameter over the entire length of the tapered roller during plastic working of the inner diameter. it can.

According to a third aspect of the present invention, in the bearing inner diameter machining apparatus according to the second aspect, the tapered roller is inserted over the entire length of the sleeve, and the tapered pin and the sleeve are moved relative to each other. It is characterized in that the entire length of the sleeve is simultaneously processed while being rotated. With this configuration, the entire length of the sleeve can be simultaneously processed.

According to a fourth aspect of the present invention, the length of the tapered portion of the tapered pin is about twice as long as the length of the tapered roller. And In this configuration, after the taper pin is inserted over the entire length of the tapered roller, burnishing can be performed while rotating the taper pin and the sleeve relatively to each other, and the transmission from the taper pin over the entire length of the tapered roller can be performed. Work can be performed by applying force evenly, and the variation in the degree of finish of the inner peripheral surface of the sleeve can be reduced.

According to a fifth aspect of the present invention, there is provided the bearing inner diameter machining device according to the second aspect, wherein a stopper for regulating the relative movement of the taper pin in the axial direction is provided to regulate the tapered pin insertion position. It is characterized in that the circumscribed diameter of the tapered roller that determines the finished dimension of the bearing inner diameter is kept at a constant value. With this configuration, the circumscribed diameter of the tapered roller can be maintained at a constant value.
Variations in the finished dimensions of the inner diameter of the sleeve can be reduced.

According to a sixth aspect of the present invention, in the structure having a cylindrical hole, the inner peripheral cylindrical surface of the cylindrical hole has a uniform surface roughness in the circumferential direction and the axial direction. Features.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bearing inner diameter machining apparatus which is a cylindrical surface machining apparatus according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view of a bearing bore machining apparatus according to one embodiment of the present invention, and FIG. 2 is a sectional view showing a main part of the bearing bore machining apparatus according to one embodiment of the present invention. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is a cross-sectional view of a bearing sleeve processed by the bearing inner diameter processing device according to the present invention.

As shown in FIG. 1, a bearing inner diameter machining apparatus according to one embodiment of the present invention has a base 9 and a chuck which is provided on the base 9 and which fixes a sleeve 8 of a bearing which is a workpiece. 10, a first motor 11 which is attached to the base 9, has a feed screw 11 a, and engages with the slider portion 13 to change the distance between the tapered pin 7 and the sleeve 8, and either the tapered pin 7 or the sleeve 8. A second motor 12 for rotating, a burnishing jig 6 having a roller guide 1 into which the tapered pin 7 is inserted, and a slider unit 1
3 is provided with a stopper 14 for regulating the lowering position.

As shown in FIG. 2, the burnishing jig 6
A roller guide 1 having a plurality of guide grooves 1a, a tapered roller 2 rotatably supported in the guide grooves 1a via positioning pins 3, and a steel ball holder 4 for supporting the roller guide 1. , A steel ball 5 held by a steel ball holder 4. The roller guide 1 of the burnishing jig 6 is rotatably supported by a steel ball holder 4 and a steel ball 5 on a chuck 10 (see FIG. 1).

The tapered pin 7 has a tapered portion 7a at a part thereof, which serves as a rolling center of the tapered roller 2 and moves in and out of the roller guide 1 in U and D directions in FIG. The circumscribed circle is adjustable over the entire length of the roller 2 and the taper ratio is configured so that the circumscribed circle is the same over the entire length of the tapered roller 2. That is, the taper ratio between the tapered pin 7 and the tapered roller 2 is set to 2: 1.

The operation of the bearing inner diameter machining device configured as described above will be described with reference to FIGS.
As shown in FIG. 1, the sleeve 8 is mounted on a predetermined position of the chuck 10. Next, as shown in FIG. 2, the tapered roller 2 of the burnishing jig 6 is inserted into the inner diameter of the sleeve 8. As shown in FIG. 1, the burnishing jig 6 is rotatably installed on the upper surface of the chuck 10 by the steel ball holder 4 and the steel balls 5. As shown in FIG. 1, the second motor 12 rotates the tapered pin 7 and the first motor 1
By lowering the slider portion 13 by 1, the second
When the taper pin 7 attached to the motor 12 is pushed into the burner jig 6 while rotating into the inner diameter of the burnishing jig 6, the tapered roller 2 of the burnishing jig 6 obtains a rotational force from the taper pin 7 as shown in FIG. The sleeve 8 rotates around the inner peripheral surface of the sleeve 8 while rotating in the guide groove 1a. Then, as shown in FIGS. 2 and 3, the tapered roller 2 rotates while pressing the inner peripheral surface over the entire length of the sleeve 8. Therefore, as shown in FIG. 4, the inner diameter 8a of the sleeve 8 is expanded over the entire length of the sleeve 8 in the axial direction, and the surface roughness is favorably processed.

According to the present embodiment, since the taper ratio between the tapered pin 7 and the tapered roller 2 of the burnishing jig 6 is 2: 1, the circumscription of the tapered roller 2 over the entire length of the sleeve 8 is performed. Since the diameters of the circles are the same, processing over the entire length of the sleeve 8 can be performed. Therefore, the sleeve 8 having a good inner diameter with a good cylindricity as shown in FIG. 4 can be machined.

Further, the position where the taper pin 7 enters the burnishing jig 6 is regulated by regulating the lowering position of the slider portion 13 by the stopper 14. Therefore, since the circumscribed circle diameter of the tapered roller 2 is regulated to be constant, the variation in the inner diameter of the sleeve 8 can be reduced.

As described above, according to the present embodiment, in the apparatus for processing the inner diameter of the sleeve 8 of the bearing,
A plurality of tapered rollers 2 having a taper that can roll around the outer circumference of the tapered pin 7;
A roller guide 1 rotatably provided on the outer periphery of the tapered pin 7 and having a guide groove 1a for accommodating a plurality of tapered rollers 2; Since it has a first motor 11 inserted into the sleeve 8 and a second motor 12 for rotating the tapered pin 7, the taper ratio between the tapered pin 7 and the tapered roller 2 is 2: 1. The circumscribed circle diameter can be changed while keeping the same diameter over the entire length of the tapered roller 2 of the burnishing jig 6.

The tapered roller 2 is inserted over the entire length of the sleeve 8 and receives the transmitting force from the tapered pin 7 over the entire length of the sleeve 8 while rotating the tapered pin 7 and the sleeve 8 relatively to each other. Since the entire region is simultaneously processed while pressing the inner peripheral surface, the entire region can be simultaneously processed while receiving the transmission force from the taper pin 7 over the entire length of the sleeve 8 and pressing the inner peripheral surface.

A stopper 14 for regulating the relative movement of the tapered pin 7 in the axial direction is provided to regulate the processing position of the tapered pin 7 so that the circumscribed diameter of the tapered roller 2 that determines the finished dimension of the bearing inner diameter is kept at a constant value. Therefore, it is possible to reduce variations in the finished inner diameter of the sleeve 8.

FIG. 5 is a sectional view showing a main part of a shaft outer diameter machining apparatus which is a cylindrical surface machining apparatus according to another embodiment of the present invention, and FIG. 6 is a sectional view taken along line CC in FIG. is there. As shown in FIGS. 5 and 6, the burnishing jig 3 of the shaft outer diameter processing device is used.
Reference numeral 6 denotes a cylindrical roller 31 having a tapered surface 37 formed on the inner peripheral surface, a roller guide 35 for guiding the tapered roller 32, and positioning pins 33 a,
The tapered roller 32 is rotatably supported via 33b, and has a shank portion.

The cylindrical roller 31 has a tapered surface 37 on its inner peripheral surface to serve as a rolling surface of the tapered roller 32, and to enter and exit the roller guide 35 in the U and D directions in the figure. The circumscribed circle can be adjusted over the entire length of the tapered roller 32 and
The taper ratio is configured so that the circumscribed circle is the same over the entire length. That is, the taper ratio between the tapered surface 37 and the tapered roller 32 is set to 2: 1.

The operation of the shaft outer diameter machining apparatus configured as described above will be described with reference to FIGS. As shown in FIG. 5, a shaft 38 as a workpiece is attached to a predetermined position of a fixture 39. Next, the portion of the tapered roller 32 of the burnishing jig 36 is attached to the outer diameter of the shaft 38. When the cylindrical roller 31 rotates, the tapered roller 32 of the burnishing jig 36 obtains a rotational force from the cylindrical roller 31 and revolves around the outer peripheral surface of the shaft 38 while rotating. Then, the tapered roller 32 rotates while pressing the outer peripheral surface over the entire length of the processing surface of the shaft 38. Therefore, the outer diameter of the shaft 38 is pressed over the entire length of the processing surface of the shaft 38, and the surface roughness is favorably processed.

According to this embodiment, the taper ratio between the tapered surface 37 of the cylindrical roller 31 and the tapered roller 32 is 2:
1, the diameter of the inscribed circle of the tapered roller 32 over the entire length of the surface to be processed of the shaft 38 is the same, so that simultaneous machining over the entire length of the shaft 38 can be performed. Become. Therefore, the shaft 38 having a good cylindricity outer diameter can be machined.

As described above, according to the present embodiment, the shaft 38
A cylindrical roller 31 mounted on a shaft 38, a plurality of tapered rollers 32 having a taper capable of rolling on the inner periphery of the cylindrical roller 31, and a roller for guiding the tapered roller 32. Having a guide 35,
Tapered surface 37 of cylindrical roller 31 and tapered roller 32
Since the taper ratio is 2: 1 during the plastic working of the outer diameter, the inscribed circle diameter can be changed while maintaining the same diameter over the entire length of the tapered roller 32 of the burnishing jig 36.

The tapered roller 32 is mounted over the entire length of the shaft 38, and the cylindrical roller 31 and the tapered roller 32 are rotated relative to each other while rotating the cylindrical roller 31 over the entire length of the processing surface of the shaft 38. Since the entire area is simultaneously processed while pressing the outer peripheral surface while receiving the transmitting force from the roller 31, the entire area is simultaneously processed while pressing the outer peripheral surface while receiving the transmitting force from the cylindrical roller 31 over the entire length of the shaft 38. can do.

The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the gist of the present invention.

[0036]

As described above, the cylindrical surface processing apparatus according to the first aspect of the present invention is an apparatus for processing a cylindrical surface, wherein a plurality of tapered rollers abutting against the cylindrical surface and rolling therewith; A rotating member having a tapered surface coaxially opposed to the rotating member; a plurality of tapered rollers that perform planetary motion by being pressed against the cylindrical surface and the tapered surface of the rotating member; a tapered surface of the rotating member and the taper Since the taper ratio of the tapered surface to the tapered surface is 2: 1, the processing accuracy such as cylindricity and surface roughness of the cylindrical surface can be processed with high precision by plastic working, and the cylindrical surface can be simultaneously formed over the entire length. Provide a cylindrical surface processing device capable of processing.

According to a second aspect of the present invention, there is provided an apparatus for processing the inner diameter of a bearing sleeve, wherein the plurality of tapered pins have a taper pin inserted into the sleeve and a taper capable of rolling around the outer circumference of the tapered pin. A tapered roller, and the outer periphery of the tapered pin is provided rotatably,
A roller guide having a guide groove for accommodating the plurality of tapered rollers, a first motor for giving the taper pin an axial relative movement with respect to the roller guide and inserting the taper pin into a sleeve, and a taper pin. A second motor for rotating the tapered pin and the tapered roller at a taper ratio of 2: 1, so that the same diameter is applied over the entire length of the tapered roller of the burnishing jig during plastic working of the inner diameter. The circumscribed circle diameter can be changed as it is.

According to the bearing inner diameter machining device of the third aspect, in the bearing inner diameter machining device of the second aspect, the tapered roller is inserted over the entire length of the sleeve, and the tapered pin and the sleeve are mutually connected. Since the entire length of the sleeve is simultaneously machined while rotating relatively, the entire length of the sleeve can be machined at the same time, and irregularities equivalent to the feed of the burnishing jig are formed on the inner peripheral surface of the sleeve. Can be prevented.

According to the bearing inner diameter machining device of the fourth aspect, in the bearing inner diameter machining device of the second aspect, the length of the tapered portion of the tapered pin is set to about twice the length of the tapered roller. After the taper pin is inserted over the entire length of the tapered roller, burnishing can be performed while rotating the taper pin and the sleeve relative to each other, and the transmission force from the taper pin is evenly distributed over the entire length of the tapered roller. In addition, it is possible to reduce the variation in the degree of finish of the inner peripheral surface of the sleeve.

According to the bearing inner diameter machining device of the fifth aspect, in the bearing inner diameter machining device of the second aspect, a stopper for regulating the relative movement of the taper pin in the axial direction is provided to regulate the machining position of the taper pin. The outer diameter of the tapered roller, which determines the finished dimensions of the bearing inner diameter, is kept at a constant value, so the outer diameter of the tapered roller can be kept at a constant value. can do.

According to the structure with a cylindrical hole of the sixth aspect, it is possible to obtain a structure with a cylindrical hole whose inner peripheral cylindrical surface has a uniform surface roughness in the circumferential direction and the axial direction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bearing inner diameter machining apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of a bearing inner diameter machining apparatus according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional view of a bearing sleeve processed by the bearing inner diameter processing device according to the present invention.

FIG. 5 is a sectional view showing a main part of a shaft outer diameter machining apparatus according to another embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC in FIG.

FIG. 7 is a cross-sectional view of a conventional bearing inner diameter processing device.

FIG. 8 is a sectional view taken along the line BB of FIG. 7;

FIG. 9 is a cross-sectional view of a bearing sleeve processed by a conventional bearing inner diameter processing device.

FIG. 10 is a cross-sectional view of a bearing sleeve processed by a conventional bearing inner diameter processing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 roller guide 1a guide groove 2 tapered roller 3 positioning pin 4 steel ball holder 5 steel ball 6 burnishing jig 7 taper pin 8 sleeve 9 base 10 chuck 11 first motor 11a feed screw 12 second motor 13 slider part 14 stopper

Claims (6)

[Claims] 1. An apparatus for processing a cylindrical surface, comprising: a rotating member having a tapered surface coaxially opposed to the cylindrical surface; and a plurality of planetary members which are pressed against the cylindrical surface and the tapered surface of the rotating member to perform planetary motion. And a taper ratio between the tapered surface of the rotating member and the tapered surface of the tapered roller is 2: 1. 2. An apparatus for processing the inner diameter of a sleeve of a bearing, wherein the tapered pin is inserted into the sleeve, a plurality of tapered rollers having a taper rotatable around the outer periphery of the tapered pin, and the outer periphery of the tapered pin is rotated. A roller guide freely provided and having a guide groove for accommodating the plurality of tapered rollers, and a first motor for axially moving the tapered pin relative to the roller guide to insert the tapered pin into a sleeve. And a second motor for rotating the tapered pin, wherein the taper ratio between the tapered pin and the tapered roller is 2: 1. 3. The tapered roller is inserted over the entire length of the sleeve, and simultaneously rotates the entire length of the sleeve while rotating the tapered pin and the sleeve relative to each other. Item 3. A bearing inner diameter processing device according to item 2. 4. The apparatus according to claim 2, wherein the length of the tapered portion of the tapered pin is about twice as long as the length of the tapered roller. 5. A stopper for regulating the relative movement of the taper pin in the axial direction is provided to regulate the insertion position of the taper pin, and the outer diameter of the tapered roller that determines the finished size of the bearing inner diameter is kept constant. The bearing inner diameter machining apparatus according to claim 2, characterized in that: 6. A structure having a cylindrical hole, wherein an inner cylindrical surface of the cylindrical hole has a uniform surface roughness in a circumferential direction and an axial direction.