JP2006110689A - Inside diameter machining device of cylindrical body and inside diameter machining method using this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of manufacturing a ferrule having through holes high in roundness and small in dispersion and lowering manufacturing cost. <P>SOLUTION: This inside diameter machining device of a cylindrical body 15 having the through holes in the longitudinal direction is furnished with a fixing part 10 to fix the cylindrical body in a state where a plurality of the through holes are arranged to continue, a machining part 30 to polish the cylindrical body by inserting a wire 31 through each of the through holes and sliding it back and forth in the axial direction and a rotating part 20 to rotate a plurality of the cylindrical bodies around its shaft as a center, and the fixing part pressurizes and fixes both ends of a plurality of the cylindrical bodies by a spring 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inner diameter processing apparatus for processing an inner diameter while holding a cylindrical body such as an optical connector ferrule used for optical communication and the like, and an inner diameter processing method using the inner diameter processing apparatus.

  Conventionally, a ferrule for fixing an optical fiber used for optical signal processing such as optical communication is an optical connector used for connecting optical fibers, or a semiconductor laser module composed of a semiconductor laser and an optical fiber, etc. Etc. are used.

  As an example, as shown schematically in FIG. 3, the optical connector is an optical fiber made of zirconia ceramics in which a single-mode optical fiber 2 made of quartz is inserted and bonded and fixed, and then the tip surface 1a is polished into a substantially convex spherical shape. The front end surfaces 1a of the optical ferrule (hereinafter referred to as ferrule) 1 are brought into contact with each other for optical connection.

  Ferrule 1 is a ceramic ferrule formed by extrusion molding, injection molding, or press molding to form a cylindrical ferrule material having a fine pilot hole in the center. This material is degreased, fired, polished on both sides, The hole is polished and finished into a highly accurate through hole 1b.

  This is because when the outer peripheral surface is processed after polishing the pilot hole of the ferrule 1, grinding is performed while rotating the ferrule 1 with reference to the through hole 1b of the ferrule 1, and the eccentricity of the through hole 1b with respect to the outer peripheral surface of the ferrule 1 It is because it is necessary to make small.

  A method of polishing the through hole 41a of the cylindrical body 41, which is a conventional short ferrule material, will be described with reference to FIGS.

  First, as shown in FIG. 4A, the connecting wires 42 are passed through the through holes 41a of the plurality of cylindrical bodies 41, and the dummy plugs 43 are applied to both ends of the aligned bodies of the plurality of cylindrical bodies 41. Then, the solder 44 is poured into the whole to fix the plurality of cylindrical bodies 41 integrally, and the connecting wire 42 is pulled out to form the fixing portion 40 in which the cylindrical bodies 41 are assembled.

  Thereafter, the fixing portion 40 is set in a processing apparatus (not shown). As shown in FIG. 4B, the processing wire 45 is passed through the wire through hole 43a of one dummy plug 43, and the fixing portion 40 is inserted. Are inserted into the through holes 41a of the respective cylindrical bodies 41. The processing wire 45 is made of a steel wire whose tip 45a is tapered by etching or the like, and a polishing material containing abrasive grains such as diamond is applied to the outer peripheral surface thereof.

  Next, as shown in FIG. 4 (c), while rotating the fixing portion 40 in the direction indicated by the arrow a, the processing wire 45 is moved back and forth in the method indicated by the arrow b from the small diameter portion to the large diameter portion. Then, the plurality of cylindrical bodies 41 are sequentially advanced. Thus, after finishing the through holes 41a of all the cylindrical bodies 41 with the processing wire 45, the fixing portion 40 is taken out from the processing apparatus, the solder 44 is melted, and the dummy plugs 43 at both ends are removed. Then, the individual ferrule 1 having the through hole 1b is taken out.

The ferrule 1 is then ground on the outer periphery, and the outer periphery is lapped, chamfered, rounded, etc., to complete the ferrule 1.
Japanese Patent Laid-Open No. 5-66320

  When the inner diameter of the cylindrical body is processed by a conventional processing device, the end surface of the flange 43b of the dummy plug 43 is merely abutted against the end surface of the cylindrical body 41. And the force for pressing the cylindrical body 41 from both sides becomes insufficient, and it is difficult to completely align the through holes 41a of the plurality of cylindrical bodies 41.

  For this reason, there is a problem that the roundness of the through hole 41a of the ferrule 41 obtained is likely to be lowered and a large variation in the hole diameter is likely to occur.

  Furthermore, it takes a lot of time to fix the solder and melt the solder, making the manufacturing cost for the polishing of the inner circumference enormous and hindering the cost reduction of the ferrule.

  Further, when grinding the outer periphery of the ferrule 1 whose inner periphery is polished by a conventional processing method, in order to reduce the eccentricity of the through hole 1b with respect to the outer peripheral surface of the ferrule 1, the through hole 1b of the ferrule 1 is centered. In order to rotate the ferru 1, the through hole 1b is required to be formed with high accuracy. However, the hole diameters of the through holes 41a are not all the same, and because there is a gap between the outer diameter of the connecting wire 42 and the hole diameter of the lower hole 41a, it is specified that the lower holes 41a are not evenly aligned. There is a problem in that an excessive grinding force is applied to the direction of, and the roundness of the through hole 1b of the ferrule 1 is reduced.

  Accordingly, an object of the present invention is to provide a cylindrical body inner diameter machining apparatus and machining capable of producing a ferrule having a high roundness and a small through-hole and avoiding the above-mentioned drawbacks and reducing the production cost. It is to provide a method.

  Accordingly, the present invention provides a cylindrical body inner diameter processing apparatus having a through hole in a longitudinal direction, the fixing unit fixing the cylindrical body in a state where a plurality of the cylindrical bodies are arranged so that the through holes are continuous, and each of the through holes. A processing unit that inserts a wire into the hole and reciprocally slides along the axial direction to polish, and a rotating unit that rotates the plurality of cylindrical bodies around the axis, and the fixing unit is arranged Further, both ends of the plurality of cylindrical bodies are pressed and fixed by springs.

  Further, the holder is characterized in that a detachable lid is fixed to both ends.

  Furthermore, the cylindrical body is a ferrule for optical communication.

  The inner diameter processing method of the present invention is characterized in that the inner diameter of the cylindrical body is processed using the inner diameter processing apparatus.

  According to the inner diameter processing apparatus of the present invention, a fixing portion that fixes a cylindrical body in a state in which a plurality of cylindrical holes are arranged, and a wire is inserted through each of the through holes, and reciprocating along the axial direction. A processing section for moving and polishing; and a rotating section for rotating the plurality of cylindrical bodies around their axes, wherein the fixing section presses and fixes both ends of the arranged cylindrical bodies by springs. Therefore, since a plurality of cylindrical bodies can be machined with high positional accuracy around the inner diameter of the cylindrical body by a slight gap provided between the holder and the cylindrical body, it varies with high roundness. A cylindrical body having a small through-hole can be obtained.

  In addition, since the holder has a detachable lid attached to both ends, both ends of the separable holder can be easily assembled, and the cylindrical body is securely secured by a spring installed in the holder. The cylindrical body can be moved up and down. Furthermore, the cylindrical body can move slightly from side to side by a slight gap provided between the holder and the cylindrical body.

  Further, when the inner diameter machining apparatus is used, the cylindrical body can be suitably used when the cylindrical body has a through hole with high roundness such as a ferrule for optical communication, and varies with high roundness. Can be obtained.

  Further, according to the inner diameter processing method using the inner diameter processing apparatus, springs are installed at both ends of the holder, and the cylindrical bodies are placed on the holder and the end faces of a plurality of continuous cylindrical bodies are arranged. By holding it through a spring and sliding the wire back and forth along the axial direction and polishing it, the cylindrical body can move slightly up and down, left and right, and this allows processing around the inner diameter of the cylindrical body In addition, the inner diameter and roundness of the cylindrical body can be processed with high accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The inner diameter machining apparatus of the present invention is a cylindrical body inner diameter machining apparatus having a through-hole in the longitudinal direction. FIG. 1 shows an inner diameter machining apparatus for a cylindrical body 15 of the present invention and a cylindrical body using this apparatus. It is sectional drawing which shows the method of processing an internal diameter. As shown in FIG. 1, a fixing portion 10 for fixing a plurality of cylindrical bodies 15 in a state in which the through holes 15a are arranged continuously, and a wire 31 is inserted into each of the through holes 15a and inside the through holes 15a. And a processing unit 30 for reciprocating sliding along the axial direction and polishing, and a rotating unit 20 for rotating the plurality of cylindrical bodies 15 about their axes.

  Here, in the inner diameter processing apparatus of the present invention, the fixing portion 10 is characterized in that both ends of the plurality of cylindrical bodies 15 are pressed and fixed by springs 11.

  As a result, the cylindrical body 15 can move slightly around the wire 31 inserted vertically and horizontally so as to be able to absorb vibration during processing by the spring pressure of the spring 11 while the both ends are pressed by the spring 11. Therefore, the deviation of the inner diameter 15a between the cylindrical bodies 15 that is continuous with the vibration during processing can be corrected, and processing can be performed with high accuracy. Further, since the cylindrical body 15 pressed by the spring pressure of the spring 11 rotates around the wire 31 inserted through the through hole 15a of the cylindrical body 15 together with the holder 12, the roundness of the through hole 15a is increased. It can be processed with high accuracy. Further, the spring 11 is preferably a spring having a spring pressure of about 50 to 200 g. By using a spring pressure of about 50 to 200 g, the spring 11 is moved up and down by a slight gap between the holder 12 and the outer periphery of the cylindrical body 15. It is possible to move slightly during processing from side to side.

  The fixing portion 10 aligns the plurality of cylindrical bodies 15 and has a spring 11 for solidifying from both ends in the axial direction, and a cylindrical holding that covers the outer periphery of the plurality of cylindrical bodies 15 with a slight gap. And the lids 13 and 14 for securely arranging the end faces of the longitudinal direction of the cylindrical body 15 and the springs 11 without any gaps, and the inner diameter of the holder 12 is outside the cylindrical body 15. It is preferable that the inner diameter is 100 to 200 μm larger than the diameter.

  Further, for example, when the cylindrical body 15 is a ferrule for optical communication, it is preferable to arrange 10 to 20 cylindrical bodies 15 arranged in the holder 12, but the number can be variously changed.

  In addition, the holder 12 can reliably arrange the both end surfaces of the cylindrical body 15 in the longitudinal direction and the spring 11 with no gaps by the lid bodies 13 and 14. Moreover, the cylindrical body 15 can be easily taken out after processing.

  Further, as shown in FIG. 1, it is preferable that the holder 12 is fixed to both ends of the holder 12 with detachable lids 13, 14. After arranging a plurality of cylindrical bodies 15 in the holder 12, the spring 11 is attached. A plurality of cylindrical bodies 15 can be securely fixed by disposing them at both ends of the cylindrical body 15 and fixing the lid bodies 13 and 14.

  In addition, although the said holder 12 and the lid bodies 13 and 14 can be comprised using raw materials, such as stainless steel and super steel, it is preferable to use super steel with high rigidity. Furthermore, since wear resistance and corrosion resistance are required, and it is necessary to process with high precision, it is preferable to use super steel having high hardness.

  Here, a method of fixing the cylindrical body 15 to the fixing portion 10 will be described in the case where the holder 12 having the lid bodies 13 and 14 is used.

  First, a plurality of cylindrical bodies 15 are arranged in the interior 12 a of the holder 12, and springs 11 are arranged at both ends and fixed with lid bodies 13 and 14.

  Next, the holder 12 on which the cylindrical body 15 is disposed is placed on the fixing portion 10, and both ends thereof are fixed with the case lid 24. The plurality of cylindrical bodies 15 aligned by the fixing portion 10 in this way are rotated by the rotating portion 20 as shown in FIG.

  The rotating unit 20 includes a rotating case 23 for inserting the fixing tool 12, a case lid 24 for fixing the fixing unit 10 to both ends of the rotating case 23, and a rotating case 23 for rotating the rotating case 23 integrally with the fixing unit 10. It comprises a drive roller 21 and a holding roller 22.

  When the fixing portion 10 is inserted into the rotating case 23 and the case lid 24, the fixing portion 10 is securely fixed, so that the portions that come into contact with the fixing portion 10 are convex, and the lid body 13, 14 can be firmly held in contact with the recess.

  Further, the processing unit 30 is inserted into the through hole 15a of the cylindrical body 15 and polished, and connected to both ends of the wire 31, and a winding roller 34 for sliding the wire 31 back and forth. And an Euler 32 for applying a diamond paste 33 to the wire 31. The two winding rollers 34 can change the winding amount of the wire 31 in various ways, and can adjust the processing amount of the through hole 15 a of the cylindrical body 15.

  Further, as shown in FIG. 2, the tip 31a of the wire 31 is processed in advance into a shape that narrows toward the tip, and the wire 31 is smoothly spring 11 and cylindrical because the fixed portion 10 rotates. The body 15 can be inserted.

  Next, a method for processing the inner diameter of the cylindrical body 15 using such an inner diameter processing apparatus will be described.

  First, the plurality of cylindrical bodies 15 are aligned by the holding unit 10, and the wires 31 are inserted into the through holes 15 a of the cylindrical body 15. The wire 31 can smoothly pass through the spring 11 and the cylindrical body 15 by rotating the fixing portion 10.

  Next, the fixing unit 10 is arranged in the rotating case 23, and the fixing unit 10 is fixed to both ends of the rotating case 23 by the case lid 24, and then the rotating case 23 is fixed to the fixing unit 10 by the driving roller 21 and the holding roller 22. Rotate integrally.

  When the fixing portion 10 is inserted into the rotating case 23 and the case lid 24, the fixing portion 10 is securely fixed, so that the portions that come into contact with the fixing portion 10 are convex, and the lid body 13, 14 can be firmly held in contact with the recess.

  The cylindrical body 15 rotates simultaneously with the rotation of the fixing portion 10, the cylindrical body 15 rotates around the wire 31 stretched by the winding roller 34, and the wire 31 reciprocates and slides by the winding roller 34. Can be processed.

  At this time, the cylindrical body 15 which is going outward by centrifugal force rotates around the wire 31 stretched by the roller 34 via the spring pressure of the spring 11, so that the spring 11 rotates the cylindrical body 15. The through-hole 15a is processed into a perfect circle.

  Further, the rotational speed of the drive roller 21 can be changed, and the rotational speed can be changed depending on the processing state of the through-hole 15a of the cylindrical body 15, so that the processing state can be optimized.

  In the conventional processing method, the plurality of cylindrical bodies 15 are fixed with solder, and cannot be individually rotated around the wire 31, and the present invention is a perfect circle of the through hole 15a of the cylindrical body 15. It can be said that it is advantageous to the degree. This is because the outer peripheral surface of the cylindrical body 15 is not fixed with solder, and can move slightly up and down and left and right within the interior 12a of the holding body 12 by the spring 11, so that the through hole 15a is the center. This is to rotate.

  Finally, the wire 31 is removed, and the cylindrical body 15 is taken out from the holder 12.

  The inner diameter processing apparatus as described above is suitably used when processing a ferrule used for optical communication as the cylindrical body 15, and the ferrule has a through hole with high roundness and small variation. This is because of the above condition.

  In addition, the internal diameter processing apparatus of this invention is not limited to the above-mentioned embodiment, A various change is possible.

  Here, the Example using the internal diameter processing apparatus of this invention is described.

  First, the inner diameter of the cylindrical body was processed using an inner diameter processing apparatus as shown in FIG.

  As the cylindrical body 15, a cylindrical body made of zirconia ceramics and having an outer diameter of φ2.5 mm, a length of 10.5 mm, and a pilot hole φ0.120 mm serving as a through hole is manufactured.

  As shown in FIG. 1, the fixing unit 10 uses a holder 12 having lids 13 and 14 at both ends and a spring having a spring pressure of 150 g as the spring body 11, and ten cylindrical bodies 15 are attached to the holder 12. The diamond paste 33 having a particle diameter of 2 μm was applied to the wire 31 having a diameter of 0.115 mm and processed.

  And after pulling out the some wire 31 with the state of FIG. 1, the cylindrical body 15 is removed.

  In addition, 10 ferrules were obtained by polishing the inner diameter of the through hole 15a of the cylindrical body 15 to 0.1255 mm.

  Further, as a comparative example, using an apparatus as shown in FIG. 5, ten cylindrical bodies 41 similar to the above were inserted through the connecting wires 42 and fixed with solder, and then polished under the same processing conditions. Thereafter, the solder was put into a high-temperature solder layer and melted to obtain individual ferrules.

  Then, the inner diameter roundness and the inner diameter dimension of each of 10 ferrules were measured.

  The inner diameter roundness was measured using an optical measuring instrument FMS, and the inner diameter dimension was measured using a wire gauge.

Table 1 shows the measurement results of the inner diameter roundness and the inner diameter dimension.

  From this result, the average value of roundness in the conventional method is 0.863 μm and the variation is as poor as 0.2406 μm, whereas the average value is 0.205 μm and the variation is as good as 0.0610 μm in the method of the present invention. Is shown.

  In addition, the accuracy of the inner diameter in the conventional method is large with an average value of 0.1255 μm and a variation of 0.0005 μm, whereas the method of the present invention shows a small value with an average value of 0.1255 μm and a variation of 0.0001 μm. Yes.

  From the above results, by using the processing method of the present invention, the variation in the inner diameter of the through hole 15a of the cylindrical body 15 can be remarkably reduced, and the roundness of the inner diameter can be improved.

  Although it relates to the inner diameter processing method of the cylindrical body, in addition to the ferrule for optical connectors, it can be used for parts having fine holes such as capillaries, nozzles, sleeves of fluid bearings, etc. The material is not limited to zirconia and alumina, and general ceramics and glass, It can also be applied to metals.

It is sectional drawing which shows one Embodiment of the internal diameter processing apparatus and internal diameter processing method of this invention. It is a side view which shows the front-end | tip part of the wire in the internal diameter processing apparatus of this invention. It is the schematic which shows the junction part of a common optical fiber connector. (A)-(c) is sectional drawing which shows the internal diameter processing method of the conventional ferrule for optical fibers.

Explanation of symbols

1: Ferrule 1a: Front end surface 1b: Through hole 2: Optical fiber 10: Fixing part 11: Spring 12: Holding tool 13, 14: Lid 15: Cylindrical body 20: Rotating part 21: Driving roller 22: Holding roller 23 : Rotating case 24: case lid 30: processing part 31: wire 32: Euler 33: diamond paste 34: winding roller 40: fixing part 41: cylindrical body 41a: through hole 42: connecting wire 43: dummy plug 43a: Wire through-hole 43b: collar 44: solder 45: processing wire 45a: tip

Claims (5)

An inner diameter machining apparatus for a cylindrical body having a through hole in a longitudinal direction, a fixing portion for fixing the cylindrical body in a state in which a plurality of the cylindrical bodies are arranged so that the through holes are continuous, and a wire inserted into each through hole. And a rotating portion that rotates the plurality of cylindrical bodies around their axes, and the fixed portions are arranged in a plurality of cylindrical shapes. An inner diameter machining apparatus for a cylindrical body, wherein both ends of the body are pressed and fixed by a spring. 2. The cylindrical body inner diameter machining apparatus according to claim 1, wherein the fixing portion fixes the cylindrical body to both ends of the plurality of cylindrical body outer peripheral holders by spring pressure. The cylindrical inner diameter machining apparatus according to claim 1 or 2, wherein the holder is fixed with removable lids at both ends. 4. The cylindrical body inner diameter processing apparatus according to claim 1, wherein the cylindrical body is a ferrule for optical communication. An inner diameter processing method using the cylindrical body inner diameter processing apparatus according to claim 1.

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