JP2002103218A - Center apparatus and working machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center apparatus and a working machine using the same excellent in durability and suitable for highly accurate working. SOLUTION: Centers 4, 5 are respectively inserted into and engaged with sides of a through-hole H in an axial center of cylindrical workpiece W. The cylindrical workpiece W is pressed and caught from the both end face sides thereof by the pair of centers 4, 5. In the constitution, the pair of centers 4, 5 are respectively rotatably supported to be capable of floating by non-contact type bearing means 8, 9 such as a porous hydrostatic bearing. Accordingly, the frictional loss at the bearing portions supporting the centers 4, 5 is reduced and the centers 4, 5 are smoothly rotated so that the cylindrical workpiece W is synchronously rotated with the centers 4, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Z-type optical connector.
Regarding a center device that supports a cylindrical work such as an r ferrule and a processing machine using the same, particularly, it has excellent durability,
This is suitable for performing high-precision processing.

[0002]

2. Description of the Related Art A Zr ferrule for an optical connector has an outer diameter of φ2.5 mm or φ1.25 mm and a hole diameter of φ0.12.
It is 5 mm, and concentricity between the hole and the outer diameter is required in the order of submicron.

In general, in order to machine a cylindrical workpiece with a high concentricity, machining using a double center method is optimal. However, when processing a minute work with a ceramic brittle material such as a Zr ferrule, when using a work turning tool or the like, it is necessary to reverse the work and rework the work, and the like. A step also occurs on the outer surface of the work. The processing means shown in FIG. 2 is used as a processing method for solving these problems.

In the manufacturing process of the Zr ferrule, since a hole is formed before the outer diameter is formed, it is difficult to form a center hole based on the hole. Therefore, the outer diameter is processed based on the through hole processed in the pre-processing, and a high concentricity is secured.

That is, as shown in FIG. 2, when the outer diameter of the Zr ferrule F is processed, the Zr ferrule F is disposed between the center 4 of the spindle unit and the center 5 of the tailing unit. The Zr ferrule F is supported by the centers 4 and 5, and the supporting structure is such that the centers 4 and 5 are respectively inserted into both ends of the through hole H formed in the Zr ferrule F axis as an optical fiber insertion hole. The Zr ferrule F is pressed and held by the two centers 4 and 5 from both ends thereof. When grinding the outer peripheral surface of the Zr ferrule F with the grindstone 3 as the outer diameter processing of the Zr ferrule F supported as described above, the work rotating roll 18 is brought into contact with the outer peripheral surface of the Zr ferrule F. At the same time, the Zr ferrule F is rotated by the rotation of the roll 18.

However, in the above-described conventional support structure using the two centers 4 and 5, since the center 4 of the spindle unit is fixed, the fixed center 4 and the through hole of the rotating Zr ferrule F are provided. Friction and wear occur between the center 4 and the center 4 side, and the fixed center 4 side is stepped, thin and easily tapered due to the relationship between the material hardness difference between the center 4 and the Zr ferrule F and the ultrafine shape of the through hole H. However, there is a problem in terms of the durability of the device that the center 4 is easily deformed by wear and the life of the center 4 is short.

The tapered portion of the center 4 caused by the abrasion deformation of the center 4 is not always coaxial with the center axis, and may be eccentric. However, when it occurs, Zr
When the outer diameter processing of the ferrule F is performed, the Zr ferrule F is ground into a tapered shape, and the processing accuracy of the Zr ferrule F is adversely affected, such as the cylindricity of the Zr ferrule F being deteriorated. For this reason, in the conventional support structure using the two centers 4 and 5, it is necessary to manually correct the eccentricity due to the uneven wear of the center 4 as described above, which is not suitable for high-precision machining.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a center device which has excellent durability and is suitable for performing high-precision machining. And a processing machine using the same.

[0009]

In order to achieve the above object, a center device according to the present invention is a center device for supporting a cylindrical work, wherein one center device is provided at both ends of a through hole of the cylindrical work shaft center. A pair of centers which are inserted and engaged with each other and press and hold the columnar work from both end surfaces thereof, and the pair of centers are rotatably supported by a non-contact type bearing means so as to be rotatable. It is characterized by the following.

The center device according to the present invention is a center device for supporting a columnar work. The center device is inserted into and engaged with both ends of the through hole of the columnar work shaft center, and the columnar work is moved. One end of the through hole is formed in an edge shape, and the other end of the through hole is formed in an R shape. The center inserted into one end of the through hole is rotatably supported by a non-contact type bearing means, and the center inserted into the other end of the R-shaped through hole is a low center such as a diamond compax. It is characterized by comprising a fixed center of the coefficient of friction.

[0011] In the center device according to the present invention, the non-contact bearing means supplies high-pressure air from the microporous porous body disposed on the base side of the center toward the center.
The center comprises a porous hydrostatic bearing having a structure for rotatably supporting the center.

The center device according to the present invention is characterized in that the non-contact type bearing means comprises a magnetic bearing having a structure in which the center is rotatably levitated and supported by the magnetic force of an electromagnet arranged on the base side of the center. It is assumed that.

The center device according to the present invention is characterized in that the rotatably supported center has a surface friction coefficient necessary for preventing slip at a contact point with a cylindrical work. Things.

[0014] The center device according to the present invention is characterized by comprising a motor for rotatably driving the center rotatably supported.

[0015] The center device according to the present invention is characterized in that it comprises a work rotating roll for rotating the cylindrical work by directly contacting the outer peripheral surface of the cylindrical work.

In the processing machine according to the present invention, in the processing machine for performing the outer diameter processing of a cylindrical work, a center device for supporting the cylindrical work is inserted into each end of the through hole of the cylindrical work axis one by one. Having a pair of centers for pressing and holding the columnar work from both end surfaces thereof,
The pair of centers may be rotatably supported by a non-contact type bearing means.

In the processing machine according to the present invention, in a processing machine for performing an outer diameter processing of a cylindrical work, a center device for supporting the cylindrical work is inserted into both ends of a through hole of the cylindrical work shaft center one by one. And a pair of centers for pressing and holding the columnar work from both ends thereof, one end of the through hole is formed in an edge shape, and the other end of the through hole is formed in an R shape. Of the pair of centers, the center inserted into one end of the edge-shaped through hole is rotatably levitated and supported by non-contact bearing means,
The center inserted into the other end of the R-shaped through hole is a fixed center having a low coefficient of friction, such as Diamond Compax.

In the processing machine according to the present invention, the non-contact bearing means supplies high-pressure air from the microporous body disposed on the base side of the center toward the base of the center, thereby forming the center. It is characterized by being composed of a porous hydrostatic bearing having a structure of rotatably floating and supporting.

The working machine according to the present invention is characterized in that the non-contact bearing means comprises a magnetic bearing having a structure in which the center is rotatably levitated and supported by the magnetic force of an electromagnet arranged on the base side of the center. It is assumed that.

[0020] The processing machine according to the present invention is characterized in that the center rotatably supported has a surface friction coefficient necessary for preventing slip at a contact point with a cylindrical work. Things.

[0021] The processing machine according to the present invention is characterized in that it comprises a motor for rotatably driving the center rotatably supported.

The processing machine according to the present invention is characterized in that it comprises a work rotating roll for rotating the cylindrical work by directly contacting the outer peripheral surface of the cylindrical work.

According to the present invention, since the center is supported by the non-contact bearing means, the wear loss at the bearing portion supporting the center is small, the center can rotate smoothly, and the cylindrical work and the center rotate synchronously. It will be.

In particular, in a structure employing a porous static pressure bearing as a non-contact type bearing means for supporting the center, the center is supported by a structure of the center using a hydrostatic bearing using an orifice restrictor or autogenous restrictor. The rigidity value increases.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a center apparatus according to the present invention and a processing machine using the same will be described below in detail with reference to FIG.

The processing machine 1 shown in FIG. 1 processes a columnar work W such as a Zr ferrule, and supports the columnar work W while supporting the columnar work W with a center device 2.
The outer diameter machining method of grinding the outer peripheral surface of the steel sheet with a grindstone 3 is adopted.

The center device 2 has a pair of centers 4 and 5, both of which are arranged so that their tips face each other. One center 4 is a tip of the spindle 6 of the spindle unit U1. The other center 5 is detachably attached to the tip of the spindle 7 of the tailing unit U2. Note that the center 4 and the spindle 6 of the spindle unit U1 and the center 5 and the spindle 7 of the tailing unit U2 are all provided coaxially. It is configured so that it can be set coaxially by moving the tailing unit U2 as a whole.

There are various types of means for supporting the pair of centers 4 and 5. In the present embodiment, both the centers 4 and 5 are rotatably supported by non-contact type bearing means 8 and 9. The configuration is adopted.

The non-contact type bearing means 8 and 9 comprises a spindle unit U
The non-contact bearing means 8 and 9 are each composed of a porous hydrostatic bearing 10 and 11.

The porous hydrostatic bearings 10 and 11 are
A plurality of porous bodies 12 are installed on the base side of 5, that is, in the vicinity of the spindles 6 and 7 to which the centers 4 and 5 are attached. By supplying high-pressure air toward 6 and 7, the centers 4 and 5 are rotatably levitated and supported.

The porous hydrostatic bearing 10 on the spindle unit U1 side
Has a function of floatingly supporting the center 4 so as to be rotatable at a fixed position in the radial direction, and a function of positioning and fixing the center 4 in the thrust direction. Such a spindle unit U
In the porous hydrostatic bearing 10 on one side, the porous body 12 is disposed at a position facing the outer peripheral surface of the spindle 6 with respect to the floating support structure of the center 4 in the radial direction.
A structure in which high-pressure air is supplied from the micropores 2 to the outer peripheral surface of the spindle is adopted. The porous body 1
2 are provided in the spindle 6 axis direction. Also,
With respect to the positioning and fixing structure of the center 4 in the thrust direction, a disk 13 is integrally attached to the outer periphery of the spindle 6, and a plurality of porous bodies 12 are arranged at positions opposed to each other via the disk 13, so that A structure in which high-pressure air is supplied toward the front and back surfaces of the disk 13 is adopted.

The porous hydrostatic bearing 1 on the tailing unit U2 side
1 has a function of rotatably supporting the center 5 in a fixed position in the radial direction so as to be rotatable. The floating support structure has the same outer peripheral surface of the spindle 7 as the porous hydrostatic bearing 10 on the spindle unit U1 side. Porous body 12 at a position facing
Are arranged, and high-pressure air is supplied from the microporous body 12 to the outer peripheral surface of the spindle 7. However, the porous hydrostatic bearing 11 on the core pushing unit U2 side has Unlike the porous hydrostatic bearing 10 on the main shaft unit U1, there is no function of positively positioning the center 5 in the thrust direction. Therefore, the core pushing unit U
The center 5 on the second side can be moved integrally with the spindle 7 in the thrust direction (axial direction of the center).

When the cylindrical workpiece W is a Zr ferrule F, in the center device 2 having the above-described structure, one optical fiber insertion hole is provided at each end of the through hole H formed in the Zr ferrule axis. Center 4 at a time,
5 and the two centers 4,
5, the Zr ferrule F is pressed and pinched from both ends thereof, and the pressing and pinching force of the centers 4 and 5 of this kind is given by the pinching pressure applying mechanism 14 on the pinching unit U2 side.

The centering pressure applying mechanism 14 is configured to press the spindle 7 on the side of the centering unit U2 in the thrust direction from the rear end thereof with the force of a spring 15. In the case of the present embodiment, only the spindle 7 and the center 5 on the side of the core pushing unit U2 can move integrally in the thrust direction, and the spindle 6 and the center 4 on the side of the spindle unit U1 are also positioned and fixed in the thrust direction. When the pressing force applying mechanism 14 operates, the center 5 of the tailing unit U2 is
5, the Zr ferrule F is pressed against the center 4 on the spindle unit U1 side, and the Zr ferrule F is pressed by the pressing force.
Are sandwiched between a pair of centers 4 and 5.

A built-in type motor 16 is built in the spindle unit U1. The motor 16 is a means for directly rotating the center 4 of the spindle unit U1. It is installed in.

Next, the operation of processing the outer diameter of the Zr ferrule F by the processing machine 1 configured as described above will be described with reference to FIG.
This will be described based on FIG.

According to the processing machine 1 shown in FIG. 1, when performing the outer diameter processing of the Zr ferrule F, the center 4 of the spindle unit U1 and the centering unit U are driven by a work supply mechanism (not shown).
The Zr ferrule F is set between the second center 5 and the center 5. Then, centers 4 and 5 are respectively inserted into both ends of the through hole H of the Zr ferrule axis. That is, the Z that faces the center 4 on the spindle unit U1 side
The center 4 of the spindle unit side U1 is inserted into one end of the through hole H of the r ferrule axis, and the other end of the through hole H of the Zr ferrule axis facing the center 5 of the tailing unit U2. The center 5 on the side of the core pushing unit U2 is inserted.

When the insertion of the centers 4 and 5 as described above is completed, the centering pressure applying mechanism 14 is operated, whereby the center 5 of the centering unit U2 moves the Zr ferrule F by the force of the spring 15 to the main shaft. The Zr ferrule F is sandwiched between the pair of centers 4 and 5 by the pressing force against the center 4 on the unit U1 side.

Next, the motor 16 operates, and the spindle 6 and the center 4 on the main spindle unit U1 rotate integrally. At this time, the rotational force of the motor 16 is applied to the centering unit 4 via the contact point between the center 4 of the spindle unit U1 and the Zr ferrule F and the contact point between the Zr ferrule F and the center 5 of the centering unit U2. It is also transmitted to the center 5 on the U2 side, and the pair of centers 4, 5 and the Zr ferrule F rotate synchronously.

Then, in the present processing machine 1, the grindstone 3 is brought into contact with the outer peripheral surface of the Zr ferrule F rotating as described above,
The outer diameter of the Zr ferrule F is processed by the grindstone 3. At this time, the dimension of the Zr ferrule F is also measured by the sizing device 17 at the same time.

If the frictional resistance at the contact point between the centers 4 and 5 and the Zr ferrule F is small, slippage occurs between the centers 4 and 5 and the Zr ferrule F due to the grinding resistance by the grindstone 3 and the like. When the frictional resistance is sufficiently large and no slip occurs, the rotations of the pair of centers 4, 5 and the Zr ferrule F are all completely synchronized even during grinding. Therefore, in order to reliably obtain such perfect synchronous rotation, the centers 4 and 5 having a large surface friction coefficient may be employed.

As described above, the working machine 1 of the present embodiment is configured such that the pair of centers 4, 5 are both rotatably supported by the non-contact type bearing means 8, 9. It is. For this reason, wear loss in the bearing portion supporting the centers 4 and 5 is small, and the center 4 and the smooth
In particular, even when a cylindrical work W made of a hard material such as a Zr ferrule F is sandwiched between a pair of centers 4 and 5 and rotated, the cylindrical work W and the centers 4 and 5 rotate synchronously. It will be. Therefore, center 4,
The friction and wear between the center 5 and the cylindrical workpiece W are eliminated, the life of the centers 4 and 5 is extended, and the centers 4 and 5 are excellent in durability.
In addition, adverse effects on machining accuracy due to wear of the centers 4 and 5;
For example, a reduction in cylindricity can be prevented, stabilization of machining accuracy can be achieved, and work for manually correcting eccentricity due to uneven wear of the centers 4 and 5 is unnecessary, which is suitable for high-accuracy machining.

According to the processing machine 1 of the present embodiment, since the porous static pressure bearings 10 and 11 are employed as the non-contact type bearing means 8 and 9 for supporting the centers 4 and 5, an orifice throttle or a self-generated throttle is used. Since the rigidity of the centers 4 and 5 is higher than the supporting structure of the centers 4 and 5 using the static pressure bearings,
When the outer diameter is processed while rotating the cylindrical work W held between the pair of centers 4 and 5, the cylindrical work W is rotated with high accuracy without being affected by the processing load applied to the cylindrical work W. Also in this respect, the processing accuracy such as cylindricity can be stabilized, which is suitable for performing high-precision processing.

Further, in the processing machine 1 of the present embodiment, the cylindrical work W is rotated by directly rotating the center 4 by the motor 16, so that this kind of cylindrical work W is rotated. As a means for performing this, a unit for a roll for rotating a work, which has been conventionally used, may be omitted.

In the above-described embodiment, an example has been described in which the center work 2 supports the columnar work W whose both ends are formed in the through hole H. In this type of the center work 2, for example, as shown in FIG. The columnar work W having such a shape of the through hole H can be supported. In the columnar work W of FIG. 1, one end of the through hole H is formed in an edge shape, and the other end of the through hole H is formed in an R shape.
When such a columnar workpiece W having the through hole H shape is supported by the center device 2, due to the structure of the center device 2, one end of the edge-shaped through hole H of the pair of centers 4 and 5 is provided. The center 4 to be inserted is rotatably levitated and supported by the non-contact type bearing means 8 as in the above-described embodiment, and the center 5 to be inserted into the other end of the R-shaped through hole H is formed of diamond. A fixed center having a low coefficient of friction, such as diamond compax, in which fine particles are sintered using a binder, can also be used.

In the above embodiment, the non-contact bearing means 8,
Although the porous hydrostatic bearings 10 and 11 are adopted as 9, for this kind of non-contact type bearing means 8 and 9, for example, a magnetic bearing can also be applied. An electromagnet is provided on the base (spindle 6, 7) side of the above, and the centers 4, 5 are rotatably levitated and supported integrally with the spindles 6, 7 by the magnetic force of the electromagnet.

In the above-described embodiment, the configuration is adopted in which the cylindrical work W is rotated by directly rotating the center 4 on the side of the spindle unit U1 by the motor 16, but the rotating means of the cylindrical work W of this type is adopted. For example, a conventional structure, that is, a structure in which a roll 18 for rotating a work is directly brought into contact with the outer peripheral surface of a cylindrical work W as shown in FIG. 2 and the cylindrical work W is rotated by the rotation of the roll 18. Can also be adopted.

In the above-described embodiment, the built-in type motor 6 is employed as the rotation driving means for the center. However, as this kind of rotation driving means, a rotation driving mechanism such as an air turbine system can be applied.

[0049]

According to the present invention, both the pair of centers are rotatably supported by the non-contact type bearing means as described above. As a result, wear loss at the bearing portion supporting the center is small, and smooth rotation of the center is possible. Since the cylindrical work and the center rotate synchronously, friction and wear between the center and the cylindrical work are reduced. As a result, it is possible to provide a center device having an excellent durability and a processing machine using the same.
In addition, it is possible to prevent adverse effects on machining accuracy due to wear of the center, stabilize machining accuracy such as cylindricity, and eliminate the need to manually correct eccentricity due to uneven wear of the center, thereby performing high-accuracy machining. It is suitable for

In particular, according to the structure employing a porous hydrostatic bearing as the non-contact type bearing means for supporting the center,
The rigidity of the center is higher than that of a center support structure using a hydrostatic bearing using an orifice throttle or autogenous throttle.When the outer diameter is processed while rotating a cylindrical work held between a pair of centers, the cylindrical The cylindrical workpiece can be rotated with high precision without being affected by the processing load applied to the workpiece, and in this regard, the processing precision such as cylindricity can be stabilized, making it suitable for high precision processing. ing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a support structure for a cylindrical work by a conventional center device.

FIG. 3 is an explanatory view of a columnar work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing machine 2 Center apparatus 3 Grinding stone 4, 5 Center 6, 7 Spindle 8, 9 Non-contact bearing means 10, 11 Porous hydrostatic bearing 12 Porous body 13 Disk 14 Core pressing force adding mechanism 15 Spring 16 Motor 17 Fixed size Apparatus 18 Roll for work rotation H Through hole W Cylindrical work F Zr ferrule U1 Spindle unit U2 Core pushing unit

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) B24B 5/02 B23Q 1/26 EZ (72) Inventor Hideo Iwadate 4-3-1 Yashiki, Narashino-shi, Chiba Seiko F term (reference) in Seiki Co., Ltd. 3C034 AA01 AA13 BB07 BB74 3C043 AA01 CC03 DD05 3C045 FD15 FD16 FE07 FE10 3C048 BC01

Claims (14)

[Claims] 1. A center device for supporting a cylindrical work, wherein the center device is inserted into and engaged with both ends of a through-hole of the cylindrical work shaft center, and presses and holds the cylindrical work from both end surfaces thereof. A center device comprising: a pair of centers, both of which are rotatably supported by a non-contact bearing means. 2. A center device for supporting a columnar work, wherein the center device is inserted into and engaged with both ends of a through hole of the columnar work shaft center, and the columnar work is pressed and clamped from both end surfaces thereof. One end of the through hole is formed in an edge shape, and the other end of the through hole is formed in an R shape. One end of the edge-shaped through hole of the pair of centers The center inserted into the R-shaped through-hole is rotatably supported by a non-contact bearing means, and the center inserted into the other end of the R-shaped through hole is a fixed center having a low coefficient of friction such as Diamond Compax. A center device characterized in that: 3. A structure in which the non-contact bearing means supplies high-pressure air from a microporous porous body disposed on the base side of the center to the center, thereby rotatably supporting the center in a floating manner. 3. The center device according to claim 1, comprising a porous hydrostatic bearing. 4. The non-contact type bearing means comprises a magnetic bearing having a structure in which the center is rotatably levitated and supported by a magnetic force of an electromagnet arranged on the base side of the center. 3. The center device according to 2. 5. The method according to claim 1, wherein said rotatably supported center has a surface friction coefficient necessary to prevent slippage at a contact point with a cylindrical workpiece. The center device as described. 6. The center apparatus according to claim 1, further comprising a motor that rotatably drives the center rotatably supported. 7. The center device according to claim 1, further comprising a work rotating roll for rotating the cylindrical work by directly contacting an outer peripheral surface of the cylindrical work. 8. A processing machine for processing an outer diameter of a cylindrical work, wherein a center device for supporting the cylindrical work is inserted into and engaged with both ends of a through-hole of the cylindrical work shaft center. A processing machine, comprising: a pair of centers for pressing and holding the cylindrical work from both end surfaces thereof, wherein the pair of centers are rotatably supported by a non-contact type bearing means. 9. A processing machine for processing an outer diameter of a cylindrical work, wherein a center device for supporting the cylindrical work is inserted and engaged with both ends of a through hole of the cylindrical work shaft center one by one. A pair of centers for pressing and holding the columnar work from both end sides thereof, one end of the through hole is formed in an edge shape, and the other end of the through hole is formed in an R shape; The center inserted into one end of the edge-shaped through hole is rotatably supported by the non-contact type bearing means, and the center inserted into the other end of the R-shaped through hole is diamond. A processing machine comprising a fixed center having a low coefficient of friction such as Compax. 10. The non-contact bearing means rotatably floats and supports the center by supplying high-pressure air from the microporous body of the porous body disposed on the base side of the center toward the base of the center. 10. The processing machine according to claim 8, comprising a porous hydrostatic bearing having a structure. 11. The non-contact type bearing means comprises a magnetic bearing having a structure in which the center is rotatably levitated and supported by a magnetic force of an electromagnet arranged on the base side of the center. 10. The processing machine according to 9. 12. The method according to claim 1, wherein the center rotatably supported has a surface friction coefficient necessary to prevent slip at a contact point with the cylindrical work. The processing machine described. 13. The processing machine according to claim 8, further comprising a motor for rotatably driving said center rotatably supported. 14. The processing machine according to claim 8, further comprising a work rotating roll for rotating the cylindrical work by directly contacting the outer peripheral surface of the cylindrical work.