JP3244258B2 - Spindle of micro hole grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main shaft of a micro-hole grinding device for grinding an inner surface of a micro-hole of a workpiece,
In particular, the present invention relates to a main shaft of a micro-hole grinding device for grinding an optical fiber insertion hole of a ferrule which is a component part of an optical fiber connector.

[0002]

2. Description of the Related Art In recent years, with the advent of multimedia,
BACKGROUND ART The development of optical communication technology using an optical fiber that is advantageous for large capacity and high speed is expected, and the demand for a ferrule used as a main connector component of the optical fiber is increasing.

[0003] The ferrule is made of, for example, a zirconia ceramic material, and a fiber insertion hole is formed in the ferrule in the axial direction, and an optical fiber is inserted and held and fixed in the fiber insertion hole.

Conventionally, when grinding a fiber insertion hole, FIG.
And the main shafts 10, 20 of the micro-hole grinding device shown in FIG.
Is used. When the fiber insertion hole is ground by using the main shaft 10 shown in FIG. 6, first, a taper wire 12 is inserted through a fiber insertion hole (not shown) of a plurality of injection-molded ferrules W, and a plurality of ferrules W are lined up. The jig 13 is housed in a semi-cylindrical jig 13.

[0005] Then, a rack agent 14 such as shellac, which is heated and melted, is introduced into the jig 13, the rack agent 14 is hardened by natural heat radiation, and a plurality of ferrules W are fixed. Next, the jig 13 is inserted into the main spindle body 11, and the main spindle body 11 is rotated in the circumferential direction and rocked in the axial direction.
While supplying diamond powder, taper wire 12
Take up. When the tapered wire 12 is fed at a predetermined speed in this manner, a minute fiber insertion hole is ground on the outer peripheral surface of the tapered wire 12. When the grinding of the fiber insertion hole is completed, the rack agent 14 is again heated and melted, and is discharged from the jig 13 to the outside.

When the fiber insertion hole is ground by using the main shaft 20 shown in FIG. 7, first, a plurality of ferrules W are sequentially inserted into the cylindrical member 25 in a line, and the ferrule W in the line is inserted. A pair of jigs 26, 26 from the axial direction
And clamp it. Then, the cylindrical member 25
Is inserted into the spindle main body 21, the spindle main body 21 is rotated in the circumferential direction and pivoted in the axial direction, and at the same time, the taper wire 22 is wound at a predetermined speed while supplying diamond powder, and the fiber is inserted into the outer peripheral surface of the taper wire 22. Grind holes.

[0007]

When the fiber insertion hole is ground by using the spindle 10 as proposed above, the racking agent 14 is used to fix the ferrule W.
It takes a long time for heat melting and cooling and hardening, so that automation is difficult and workability is deteriorated.

Further, when the ferrule W is fixed using the fiber insertion hole having a low processing accuracy by injection molding as a reference hole, and when the rack agent 14 is cooled and hardened, the rack agent 1
The non-uniform temperature of No. 4 causes the center positions of the fiber insertion holes of the plurality of ferrules W to be shifted from each other, resulting in a problem that the grinding accuracy is lowered such that the hole shape of the fiber insertion hole after grinding is deformed. is there.

Further, when grinding the fiber insertion hole using the spindle 20, when fixing a row of ferrules W,
In order to clamp from the axial direction, a plurality of ferrules W
There is a problem in that the center positions of the fiber insertion holes are displaced from each other, a desired hole shape cannot be obtained, and the grinding accuracy is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to grind minute holes in a plurality of workpieces with high precision and good workability, and to achieve automation. It is an object of the present invention to provide a main shaft of a micro-hole grinding device capable of performing the above-described steps.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0012]

In order to achieve the above object,
The present invention is directed to a micro-hole grinding apparatus that inserts a tapered wire into micro holes of a plurality of workpieces and grinds the micro holes of the workpiece with the outer peripheral surface of the tapered wire while winding the taper wire in the axial direction of the workpiece. A main spindle body that rotates in the circumferential direction and swings in the axial direction on the main spindle;
A retainer that is inserted into a substantially central portion of the main body, and that retains the plurality of workpieces in a line at predetermined intervals .
The retainer is located in contact with one side of the inner cylinder surface in the radial direction,
The main body has an inclined surface, and the inclined surface extends in the axial direction of the spindle body.
Clamp pieces urged in the direction to advance
And placed in contact with the other radial side of the inner cylinder surface of the spindle body
And a V groove parallel to the axis of the main spindle body is provided on the retainer side.
Provided work receiver and inclined surface of the clamp piece
Between the clamp piece and the workpiece.
Worked between the V-groove of the work receiving part
And a clamp needle for holding and clamping an object.
It is characterized by doing.

[0013] The present invention also relates to the above-mentioned plurality of clamp pieces.
Contacting the clamp piece against the biasing force of the
With a notch, and slidable in the axial direction of the spindle body.
A clamp bar is provided, and the unclamping bar
Worked by pushing the clamp piece against the force
It is characterized in that an object is released from being clamped .

Further, the present invention is characterized in that a guide hole for guiding a tapered wire to a minute hole of a workpiece is formed in a retainer.

Therefore, according to the present invention, after a plurality of workpieces are arranged and held in a row at predetermined intervals on the retainer, the retainer is inserted into the main spindle body, and the plurality of workpieces are supplied into the main spindle body. . Then, the outer peripheries of the plurality of workpieces are individually clamped by the clamping means, and a taper wire is inserted through the guide holes of the retainer into the fine holes of the workpiece, and then the main spindle body is rotated in the circumferential direction and rocked in the axial direction. At the same time, the fine holes of the plurality of workpieces are ground on the outer peripheral surface of the tapered wire while winding the tapered wire.

In this case, the plurality of workpieces are individually clamped on the basis of the outer periphery, so that the center of the plurality of workpieces can be prevented from being displaced from the center of each other, and the center position of the plurality of workpieces can be avoided. Are ground in a state in which coincides with each other, so that the fine holes of the plurality of workpieces are each processed into a desired hole shape, and the processing accuracy is improved.

When the workpiece is clamped, its outer periphery is pressed by the inclined surface of the clamp piece via the clamp needle. At this time, since a space formed between the inclined surface of the clamp piece and the outer periphery of the workpiece has a wedge shape, a wedge effect is generated between the inclined surface of the clamp piece and the outer periphery of the workpiece, and the workpiece is formed. Is securely clamped.

Further, by moving the unclamping bar in a direction opposite to the pressing direction of the clamp piece, the workpiece can be easily released from being clamped.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In describing the embodiments, those having the same functions will be denoted by the same reference numerals.

FIG. 1 is an axial partial cross-sectional view of a main shaft of a micro-hole grinding device showing one embodiment of the present invention, and FIG. 2 is a diameter of a main shaft of the micro-hole grinding device showing one embodiment of the present invention. FIG. 3 is a plan view of a retainer on a main shaft of the micro-hole grinding device according to an embodiment of the present invention. FIG. 4 is a retainer on a main shaft of the micro-hole grinding device according to the embodiment of the present invention. FIG. 5 is a front view of an unclamping bar of a main shaft of a micro-hole grinding device according to an embodiment of the present invention.

The main shaft 30 of the micro-hole grinding apparatus shown in FIG.
A spindle main body 31 which is formed in a cylindrical shape and which rotates in the circumferential direction and swings in the axial direction, and a retainer which is inserted into a substantially central portion of the spindle main body 31 and which holds a plurality of ferrules W in a line at predetermined intervals. 32, a clamp portion 33 for individually clamping the outer periphery of the plurality of ferrules W, and a clamp portion 33
And an unclamping bar 36 for releasing the clamp of the plurality of ferrules W.

The clamp portion 33 includes a plurality of clamp pieces 33a each having an inclined surface a and a work receiver 33c on which the ferrule W is placed, and the clamp portion 33 is provided between the inclined surface a of the clamp piece 33a and the outer periphery of the ferrule W. A plurality of clamp needles 33b are slidably interposed, a V-groove 33e is formed on the upper surface of the work receiver 33c, and the ferrule W is mounted on the V-groove 33e.

A clamp spring 33d is attached to the rear of the clamp piece 33a, and the clamp piece 33a is urged in the axial direction of the ferrule W by the clamp spring 33d. In this case, the space formed between the inclined surface a of the clamp piece 33a and the outer periphery of the ferrule W has a wedge shape, and the outer periphery of the ferrule W is reliably pressed by the clamp needle 33b.

As shown in FIGS. 3 and 4, the retainer 32 is formed with a work holding portion 32a for holding the ferrule W at a predetermined interval in the longitudinal direction thereof.
A guide hole 32b for guiding the tapered wire 34 to the fiber insertion hole w is formed coaxially with the fiber insertion hole w.

As shown in FIG. 5, the unclamping bar 36 has a plurality of notches 36a in which a plurality of clamp pieces 33a are individually pressed and contacted by a clamp spring 33d in the axial direction of the ferrule W. Is moved in the direction opposite to the pressing direction, the clamp needle 33b becomes free, and the clamp of the ferrule W is released.

Since the main shaft of the micro-hole grinding apparatus is configured as described above, when grinding the fiber insertion hole w,
First, after the plurality of ferrules W are arranged and held in a line in the work holding portion 32 a of the retainer 32, the retainer 32 is inserted into the main spindle body 31. Thus, the main spindle body 3
When a plurality of ferrules W are supplied to the inside, the outer circumferences of the plurality of ferrules W are individually pressed by the inclined surfaces a of the clamp pieces 33a via the clamp needles 33b, and the ferrules W are placed on the V grooves 33e of the work receiver 33c. Pressed to.

Thus, the plurality of ferrules W are clamped between the inclined surface a of the clamp piece 33a and the work receiver 33c.

Next, the taper wire 34 is inserted into the fiber insertion hole w of the ferrule W from the guide hole 32a of the retainer 32.
After passing through, the main spindle body 31 is rotated in the circumferential direction and pivoted in the axial direction, and the taper wire 34 is wound up while supplying diamond powder to the taper wire 34.
The fiber insertion holes w of the plurality of ferrules W are ground on the outer peripheral surface of the tapered wire 34. When the grinding is completed, the clamping of the ferrule W is released by moving the unclamping bar 36 in the direction opposite to the pressing direction of the clamp piece 33a, and then the retainer 32 is pulled out of the main spindle body 31 to the outside. And the unprocessed ferrule W are exchanged. After that, the above operation is repeated, and the fiber insertion holes w of the plurality of ferrules W are continuously ground.

As described above, in the main shaft of the micro-hole grinding apparatus according to the present embodiment, the plurality of ferrules W are individually clamped on the basis of the outer circumference, so that the fiber insertion holes w of the plurality of ferrules W are mutually connected. Since the center displacement is avoided and the fiber insertion holes w are ground in a state where the center positions thereof match each other, the fiber insertion holes w of the plurality of ferrules W are each processed into a desired hole shape, and the processing accuracy is improved. .

When the fiber insertion hole w of the ferrule W is clamped, its outer periphery is
It is pressed by the inclined surface a of the clamp piece 33a via the b. At this time, since a space formed between the inclined surface a of the clamp piece 33a and the outer periphery of the ferrule W has a wedge shape, a wedge effect occurs between the inclined surface a of the clamp piece 33a and the outer periphery of the ferrule W, and a ferrule is formed. W is securely clamped.

Further, the plurality of ferrules W are clamped in a state where the center positions of the fiber insertion holes w coincide with each other, and the tapered wire 34 is inserted into the guide hole 32b of the retainer 32a. Is prevented.

The plurality of ferrules W are connected to the retainer 3
Since the fiber insertion hole w is held at a predetermined interval, a highly accurate hole shape can be obtained even if the accuracy of the fiber insertion hole w before processing is poor.

Although the main shaft of the micro-hole grinding device according to the embodiment of the present invention has been described in detail, the present invention is not limited to the main shaft of the micro-hole grinding device described in the above embodiment.
Various modifications can be made in the design without departing from the spirit of the invention described in the claims of the present invention.

[0034]

As will be understood from the above description, the spindle of the micro-hole grinding apparatus of the present invention can be automated by clamping a plurality of workpieces individually on the basis of the outer circumference. Since the center of the micro holes of the plurality of workpieces is prevented from being misaligned and the center positions of the micro holes are matched, the micro holes of the plurality of workpieces are each formed into a desired hole shape. It is processed and the processing accuracy can be improved.

When the workpiece is clamped, its outer periphery is pressed by the inclined surface of the clamp piece via the clamp needle. At this time, since a space formed between the inclined surface of the clamp piece and the outer periphery of the workpiece has a wedge shape, a wedge effect occurs between the inclined surface of the clamp piece and the outer periphery of the workpiece, and the workpiece has a wedge effect. Can be reliably clamped.

[Brief description of the drawings]

FIG. 1 is an axial partial cross-sectional view of a main shaft of a micro-hole grinding device according to an embodiment of the present invention.

FIG. 2 is a radial cross-sectional view of a main shaft of the micro-hole grinding device showing one embodiment of the present invention.

FIG. 3 is a plan view of a retainer on a main shaft of the micro-hole grinding device according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a retainer on a main shaft of the micro-hole grinding device according to an embodiment of the present invention.

FIG. 5 is a front view of an unclamping bar of a main shaft of the micro-hole grinding device according to the embodiment of the present invention.

FIG. 6 is an axial sectional view of a main shaft of a conventional micro-hole grinding device.

FIG. 7 is an axial sectional view of a spindle of another conventional micro-hole grinding device.

[Explanation of symbols]

 Reference Signs List 30 spindle 31 spindle main body 32 retainer 32a work holding part 32b guide hole 33 clamp part 33a clamp piece 33b clamp needle 33c work receiver 33d spring clamp 33e V groove 34 taper wire 36 unclamping bar 36a cutout part a inclined surface W ferrule w fiber insertion Hole

Continuation of the front page (56) References JP-A-3-190664 (JP, A) JP-A-6-51162 (JP, A) JP-A-6-118278 (JP, A) JP-A-51-33278 (JP) , U) Jikken 53-5977 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23Q 3/06 304 B24B 5/40 B24B 5/48 B24B 19/00 603 B24B 41 / 06

Claims (3)

(57) [Claims] 1. A tapered wire in micro holes of a plurality of workpieces.
Through the tapered wire in the axial direction of the workpiece.
While winding, the outer peripheral surface of the taper wire
The main shaft of a micro-hole grinding device that grinds micro-holes
A main spindle body which rotates in the circumferential direction and swings in the axial direction;It is inserted into the approximate center of the spindle body, The above multiple processing
A retainer for holding objects in a line at predetermined intervals,It is arranged in contact with one side in the radial direction of the inner cylinder surface of the spindle body.
An inclined surface on the retainer side,
Multiple biased in a direction to advance the inclined surface in the direction
A clamp piece, It is arranged in contact with the other radial side of the inner cylinder surface of the spindle main body.
A V-groove parallel to the axis of the main spindle body is provided on the retainer side.
With the received work piece, Between the inclined surface of the clamp piece and the outer periphery of the workpiece.
In rare cases, the above-mentioned work may be
Clamp the work piece with the V-groove
Clamp needle  A main shaft of a micro-hole grinding device, comprising: 2. The device according to claim 2, wherein said plurality of clamp pieces are opposed to each other.
With multiple notches that press against the clamp piece
And an unclamping bar that can slide in the axial direction of the spindle body.
The unclamping bar is
Clamp the workpiece by pushing the pump piece.
The main shaft of the micro-hole grinding device according to claim 1, wherein the main shaft is released . 3. A fine hole in the workpiece is provided in the retainer.
Guide holes are formed in the
The main shaft of the micro-hole grinding device according to claim 1 or 2, wherein: