WO1991008079A1 - Method and apparatus for manufacturing metal pipe clad optical fiber cable - Google Patents
Method and apparatus for manufacturing metal pipe clad optical fiber cable Download PDFInfo
- Publication number
- WO1991008079A1 WO1991008079A1 PCT/JP1990/001579 JP9001579W WO9108079A1 WO 1991008079 A1 WO1991008079 A1 WO 1991008079A1 JP 9001579 W JP9001579 W JP 9001579W WO 9108079 A1 WO9108079 A1 WO 9108079A1
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- WO
- WIPO (PCT)
- Prior art keywords
- metal tube
- optical fiber
- fiber cable
- metal
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/26—Seam welding of rectilinear seams
- B23K26/262—Seam welding of rectilinear seams of longitudinal seams of tubes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4484—Manufacturing methods of optical cables with desired surplus length between fibres and protection features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
- G02B6/4488—Protective covering using metallic tubes
Definitions
- the present invention relates to an apparatus and method for manufacturing a metal tube-coated optical fiber cable.
- the breaking strength of the optical fiber is about 6 (kg) with a diameter of 126 (/m), which is quite high, but the elongation rate when this tension is applied is 3 to 6%, which is higher than that of conventional cables. Significantly smaller than aluminum. Therefore, it is necessary to secure the strength by placing a tensile strength member in the optical fiber cable. Also, the strength of optical fibers may deteriorate when immersed in water. Therefore, when laying an optical fiber cable on the bottom of the sea or under water, it is necessary to use an optical fiber cable with a jacket structure in which the optical fiber cable is covered with a thin metal tube in order to secure the installation tension and water resistance. be.
- the heat generated when joining the gaps of the metal pipes is applied to the optical fiber for a relatively long time, which may cause thermal damage.
- laser beams with a narrowed diameter are used to weld the butt portions of the metal tubes to continuously manufacture optical fiber cables coated with metal tubes.
- a device and method for this are disclosed, for example, in Japanese Patent Application Laid-Open No. 64-35514.
- This metal-coated optical fiber cable manufacturing apparatus forms a continuously fed flat metal strip into a metal tube having a longitudinal gap at the neck.
- An introduction tube is inserted into the metal pipe through the gap in the metal pipe, and the optical fiber is introduced into the metal pipe by the introduction tube. After closing the gap in the metal tube into which the optical fiber is introduced, the metal tube is sent to the laser welding equipment.
- the laser welding equipment welds the butted parts by irradiating a laser beam focused on a position spaced outward from the surface of the butted parts while positioning the top butted parts of the sent metal pipes with guide rollers. This defocusing to the outside of the butt allows welding of the butt without protecting the optical fiber with a heat shield.
- the metal tube containing the optical fiber cable After reducing the outer diameter of the metal tube containing the optical fiber cable to a predetermined size, it is wound around a cabustan and pulled out continuously.
- spatter is generated during welding, but if the guide tube is close to the projecting portion, the spatter deposited on the introduction tube is likely to come into contact with the back bead on the back surface of the welded portion, and the spatter adheres. Contact with the back side of the welded part destroys the heat balance of the welded part, resulting in poor welding. In order to avoid welding defects due to this spatter, If the generation of the back bead portion, which is the source of the tatter, is suppressed too much, an unwelded portion will occur. Also, when the introduction tube is in contact with the butt portion, a phenomenon similar to poor welding due to spatter occurs. For this reason, it has the disadvantage that it is practically impossible to carry out a continuous manufacturing operation for a long period of time (a long product manufacturing operation).
- the metal pipe is heated above the boiling point, and part of it evaporates or scatters, creating holes in the irradiated surface.
- the laser beam is focused above the metal pipe, avoiding the laser beam from being focused within the wall thickness of the abutting portion of the metal pipe.
- the focus is placed on the upper part of the metal pipe, the cross-sectional shape of the molten part becomes the shape of a lower bulge, and shrinkage holes and cracks are likely to occur inside, and there is a disadvantage that the amount of spatter increases. rice field.
- the present invention has been made to solve such drawbacks, and it is possible to reliably weld the butt portions of metal pipes, to prevent damage to the fiber cable during welding, and to operate continuously for a long time. It is an object of the present invention to provide a manufacturing apparatus and manufacturing method for a metal tube coated optical fiber cable that can
- An apparatus for manufacturing a metal tube coated optical fiber cable comprises an assembly comprising a plurality of roller pairs for shaping a pulled metal strip and abutting both ends thereof to form a metal tube; A laser beam is applied to the butt joints to form a sealed metal tube.
- An apparatus for manufacturing a metal tube-coated optical fiber cable having a welding means and an optical fiber introduction means for introducing an optical fiber or an optical fiber bundle into the formed metal tube,
- the laser welding means determines the maximum value of the defocus amount (defocus amount) of the laser beam emitted from the laser irradiation means by the minimum value of the back bead radiation determined according to the outer diameter of the metal pipe, and determines the defocus amount.
- the minimum value of is determined by the maximum value of the back bead width determined according to the thickness of the metal pipe,
- the laser beam is irradiated while being defocused (defocused) within the defocus amount.
- throttling means for reducing the outer diameter of the sealed metal tube, and the metal strip, the formed metal tube and the optical fiber or optical fiber through the assembly, the optical fiber introduction means, the laser welding means and the throttling means.
- a pulling means is preferably provided for continuously pulling the sealed metal tube containing the fiber bundle.
- the optical fiber introduction means may have an introduction tube that is inserted into the metal tube being formed and is elastically pressed against the inner wall of the metal tube on the side opposite to the irradiation surface at the irradiation position of the laser light. Preferred.
- the laser irradiation means of the laser welding means such that the focus of the laser beam is aligned with the inside of the metal pipe.
- a metal strip to be pulled is passed through a forming roller.
- a forming step of forming a metal tube by using a laser beam a laser welding step of welding the abutting portion of the metal tube to form a sealed metal tube; and an optical fiber introduction step of introducing an optical fiber or an optical fiber bundle into the metal tube.
- the maximum defocus amount of the irradiated laser beam is determined by the minimum back bead width determined according to the outer diameter of the metal tube, and the minimum defocus amount is determined according to the thickness of the metal tube. Determined by the maximum value of the back bead width, the welding speed is set by the maximum and minimum values of the defocus amount, and the laser beam is irradiated while defocusing within the range of the defocus amount.
- the introduction tube inserted into the metal tube being formed to introduce the optical fiber or the optical fiber bundle is elastically pressed against the inner wall of the metal tube on the side opposite to the irradiated surface at the laser beam irradiation position. It is desirable to
- the defocusing is preferably performed by focusing the laser beam inside the metal tube.
- an optical fiber cable is guided by an introduction tube that also serves as a heat shield and is introduced into a metal tube to be coated.
- the thermal effect on the optical fiber cable is reduced by elastically contacting the inner wall of the metal tube on the side opposite to the projecting portion of the metal tube.
- the maximum defocus amount of the laser beam irradiated to the butted portion is determined by the minimum back bead width determined according to the outer diameter of the metal tube, and the minimum defocus amount is determined according to the thickness of the metal tube. fixed
- the welding speed is set according to the maximum and minimum values of the defocus amount, and the laser beam is irradiated while defocusing within the range of the defocus amount. By doing so, welding is performed with an appropriate irradiation power density according to the dimensions of the metal pipe.
- FIG. 1 is an overall block diagram showing an embodiment of the present invention
- Figs. 2A and 2B are sectional views showing metal pipes in the forming process respectively
- Figs. 3A, 3B and 3C. 4 is a side view showing the forming roller pair of the second assembly
- FIG. 4 is a block diagram showing the optical fiber introduction means
- FIG. 5 is a block diagram showing the laser welding means
- FIG. 6 is a side view showing the guide shoe.
- Figures 7A and 7B show the tension variable means and the tension adjusting means, respectively
- Figure 7A is a top view
- Figure 7B is a front view
- Figure 8 is the projecting portion of the metal pipe.
- Fig. 9 is a characteristic diagram showing the relationship between pipe outer diameter and back bead width;
- Fig. 9 is a characteristic diagram showing the relationship between pipe outer diameter and back bead width; Fig.
- FIG. 1 is an overall block diagram showing one embodiment of the present invention.
- the apparatus for manufacturing a metal tube-coated optical fiber cable comprises a first assembly 3 and a second assembly which form a metal strip 1 and abut both ends to form a metal tube.
- an assembly 2 consisting of a three-dimensional body 4; an optical fiber introducing means 6 provided between the first assembly 3 and the second assembly 4 for introducing an optical fiber cable 5 into the molded metal tube; 2 has a laser welding means 7 provided in the latter stage.
- a measuring section 8 and a narrowing means 9 are connected to the rear stage of the laser welding means 7 .
- a pulling means consisting of a tension variable means 11 and a tension adjusting means 13 for the metal tube coated optical fiber cable 12.
- the tension variable means 11 the tension adjustment means 13, the tension adjustment means 14 of the metal strip 1 and the tension adjustment means 15 of the optical fiber cable 5 provided in the front stage of the assembly 2, It constitutes a surplus length control means for arbitrarily adjusting the relative length of the optical fiber cable to the metal tube, that is, the surplus length.
- the first assemblies 3 constituting the assembly 2 are continuously arranged in a row. It consists of a plurality, for example, five sets of forming roller pairs 31a to 31e. Each forming mouth pair 31a to 31e has a different forming surface in sequence, and the continuously fed metal strip 1 is formed on the top as shown in the cross-sectional view of FIG. 2A. It is processed into a substantially U-shaped metal tube 1a having a vertical gap 16.
- the second assembly 2 also consists of a plurality of, for example, five pairs of forming rollers 41a to 41e arranged in a continuous line, as shown in FIGS. 3A, 3B and 3C.
- the upper rollers of the forming roller pairs 41a to 41d in the preceding stage have fins 17 whose widths are gradually reduced. Then, the gap 16 of the metal tube 1a is engaged with the fin 17, and while positioning so that the gap 16 comes to the top of the metal tube 1a, the gap of the gap 16 is made small, The forming roller pair 41e at the final stage abuts the gap 16 to form a metal tube 1b that is almost completely closed at the abutting portion 18 as shown in FIG. 2B.
- the optical fiber introduction means 6 as shown in the partial cross-sectional view of FIG. It has an inert gas supply tube 63 connected by 2.
- the introduction tube 61 is made of a metal with good thermal conductivity, such as copper or a mesh alloy, and is formed to have an outer diameter smaller than the inner diameter of the metal tube lb.
- This introduction tube 61 is inserted from the gap 16 of the metal tube 1 between the first assembly 3 and the second assembly 4, and its tip passes through the laser welding means 7 and is subjected to the eddy current flaw detection of the measurement part 8. In front of Machine 8 1 positioned.
- the reason why the tip of the introduction tube 6 1 is inserted up to the front of the eddy current flaw detector 8 1 is to prevent the flaw detection accuracy from being adversely affected if the introduction tube 6 1 is passed through the eddy current flaw detector 8 1. .
- the introduction tube 61 is passed through the eddy current flaw detector 81 and does not adversely affect the flaw detection result, for example, the diameter of the metal pipe is large and the introduction tube 61 is placed on the opposite side of the flaw detection position. If it is in contact with the inner wall of the metal pipe, it may be passed beyond this position, for example, up to this side of the throttling means 9 o
- This lead-in tube 61 is attached upward in front and Z or behind the laser beam irradiation position of the laser welding means 7 and is in elastic contact with the inner wall surface of the metal tube 1b. 9), or the metal tube 1b is placed above the laser beam irradiation position by a certain distance as shown in FIG. 20, or the introduction tube 61 It is arranged so as to contact the inner wall of the metal tube 1b on the side opposite to the laser beam irradiation position by giving it a downward elastic force.
- the introduction tube 61 is bent from the state I to the state ⁇ ((A) in the figure), brought into contact with the inner wall of the metal tube 1b in the state ⁇ ((B) in the figure), and the optical fiber introduction means Curved by fixing 6 in an appropriate position It can be easily achieved by maintaining the state.
- a positioning mechanism 612 such as a spring mechanism to the optical fiber introduction means 6 as necessary.
- the positioning part 71 which will be described later, is finely adjusted.
- the later-described servo roll stand 82 is finely adjusted.
- the laser welding means 7 as shown in the configuration diagram of FIG. 5, consists of a positioning portion 71 for positioning the metal tube 1b and a laser welding portion 72.
- the positioning part 71 is composed of, for example, two sets of guide shoes 73, 74, a CCD seam monitor 75 provided between the guide shoes 73, 74, and the positions of the guide shoes 73, 74 in the vertical direction. It has a micrometer 76 for horizontal fine adjustment.
- the guide shoes 73, 74 consist of an upper shoe 73a (74a) and a lower shoe 73b (74b).
- the shoe 73a (74a) has a flat surface that contacts the metal tube 1b
- the lower shoe 73b (74b) has, for example, a V-shaped groove that engages with the metal tube 1b. and is biased upward by the panel.
- the laser welding part 72 has a laser irradiation means 77 and a gas sealing means 78 for sealing the welding position of the metal tube 1b with an inert gas such as argon gas.
- the laser irradiation means 77 is connected to, for example, a carbon dioxide laser device.
- a laser beam is guided through an optical system, condensed, and irradiated at an angle of about 90 degrees with respect to the surface of the metal tube 1b.
- the focal point of this irradiated laser beam is adjusted to be below the abutting portion 18 of the metal tube 1b, that is, to the inside of the metal tube 1b.
- the measurement unit 8 provided downstream of the laser welding means 7 has a servo roll stand 82, a speedometer 83 and an eddy current flaw detector 81, and checks the welding state and the like.
- the squeezing means 9 consists of a roller die, and squeezes the outer diameter of the welded and sealed metal tube 1c to a predetermined diameter to form a thin metal tube 1d corresponding to the outer diameter of the optical fiber cable 5.
- the tension variable means 11 provided on the delivery side of the throttle means 9 is
- Consists of a capstan with 1 1 b Consists of a capstan with 1 1 b.
- the surface of one roll 11a is formed smooth, the surface of the other roll 11b is formed with a plurality of grooves, and the metal tube 1d is wound multiple times without overlapping.
- the tension adjusting means 1 and 3 also have a pair of rolls.
- It consists of a dancer roll stand having 13a and 13b, and the position of one roll 13b is moved in the direction of the arrow to move the rolls 13a and 13b.
- Tension adjusting means 14 for adjusting the tension of the metal strip 1 sent to the assembly 2 and the tension of the optical fiber cable 5 sent to the optical fiber introduction port of the introduction tube 61, 15 each consist of a dancer stand. This dancer stand 1 4, 15 varies the tension by moving weights applied to pulleys 14a and 15a engaged with the metal strip 1 and the optical fiber cable 5.
- the metal strip 1 is continuously supplied to the assembly 2 while adjusting the metal strip 1 to a predetermined tension with the dancer stand 14 .
- a first assembly 3 of assemblies 2 forms the supplied metal strip 1 into a metal tube 1a having a longitudinal gap 16 at the top.
- This metal tube 1a is sent to the second assembly 4, and the gap 16 is gradually engaged with the fins 17 of the forming roller pairs 41a and 41b of the second assembly 4 to fill the gap 16. are butted to form a completely closed metal tube lb at the abutting portion 18.
- the abutting portion 18 After passing the final forming roller 41e, the abutting portion 18 has a small gap 18a as described later, but the gap 18a is formed after the forming roller 41e.
- a separate CCD monitor (not shown) confirmed that there was no change until just before the laser beam irradiation position.
- the optical fiber cable 5 adjusted to a predetermined tension by the dancer stand 15 is inserted between the first assembly 3 and the second assembly 4 through the gap 16 of the metal tube 1a. is fed continuously through an introduction tube 6 1 . At the same time, connect to the introduction tube 6 1. Argon gas is supplied from the connected inert gas supply tube 63 and sent into the introduction tube 61.
- the metal tube 1b into which the introduction tube 61 is inserted is sent to the laser welding means 7. Since the metal pipe lb sent to the laser welding means 7 is positioned by the fins 17 of the forming mouth pair 41a, 41b, the butt part 18 is irradiated from the laser irradiation means 77. It can be precisely adjusted to the position of the laser beam to be projected.
- the metal tube lb sent to the positioning portion 71 of the laser welding means 7 is guided by being engaged with the grooves of the guide shoes 73,74. Therefore, it is possible to prevent the metal tube 1b from lateral displacement, rotation, and meandering.
- Observation of the positional variation of the abutment portion 18 by the CCD monitor 75 revealed that the abutment portion 18 moved ⁇ 100 m due to twisting when the guide rollers were used, but the guide rollers did not move. was found to move only ⁇ 15 m when using .
- the CCD seam monitor 75 detects the position of the abutting portion 18 of the metal tube 1b, and according to the detection result, the micrometer 76 is automatically or manually operated to move the guide shoes 73, 74, and the abutment base. Fine adjustment is made so that the bent portion 18 is at a predetermined position with respect to the focal point of the laser beam.
- the guide shoes 73 and 74 of the positioning portion 71 prevent the metal tube 1b from rotating and creeping, and the fins
- the abutting portion 18, which is accurately positioned with respect to the laser irradiation position by the attached rollers 41a to 41d, is guided to the laser irradiation position without meandering the metal tube lb.
- the introduction tube 61 can be brought into firm elastic contact with the inner wall surface of the metal tube 1b. Contribute to manufacturing operations
- the positioning portion 7 A metal tube 1b is arranged above or below 1 at a certain distance or more (but within the range of elastic limit) with respect to the bus line, and the metal tube 1b forms two sides of a substantially triangular shape. do.
- the positioning part 71 functions as means for adjusting the tension of the metal pipes (particularly l c and I d ), like the tension adjusting means 14 for the metal strip described later. This suppresses the vibration of the metal tube 1b at the laser welding position (marked with X in the figure).
- the adjustment described above enables advanced welding control and further reduces adverse effects of welding, contributing to long-time operation.
- the metal pipe 1b with the position of the butt portion 18 adjusted in this manner is sent to the laser welded portion 72.
- the laser welding part 72 welds the butt part 18 by irradiating the laser beam from the laser irradiation means 77 while supplying argon gas to the butt part 18 of the metal tube 1b by the gas seal means 78.
- the inner surface of this welded portion is sealed by argon gas that flows into the introduction tube 61, blows out from the tip and flows back.
- the introduction tube 61 guiding the optical fiber cable 5 is arranged so as to elastically contact the inner wall of the metal tube 1b on the side opposite to the laser beam irradiation position. Since a gap is provided between the inner surface of the butt part 18 and the introduction tube 61, the gap and the introduction tube 61 provide heat shielding to reduce the effect of heat on the optical fiber cable 5. Can be made smaller.
- the positioning portion 71 is adjusted so that the metal pipe lb is positioned above the pass line. , the above arrangement of the introduction tube 61 can be realized more elastically.
- the temperature rise of the optical fiber cable 5 can be suppressed as much as possible.
- the temperature in the vicinity of the optical fiber cable 5, which has reached a temperature of C or higher, is about 115 to 135°C by providing the above-mentioned gap, and is reduced to 100°C by flowing argon gas. I was able to get it down to C.
- the adverse effect of the spatter accumulated on the introduction tube 61 on the welding can be temporally delayed, and the welding can be stably performed for a long period of time.
- the laser light emitted from the laser irradiation means 77 is adjusted so that the focal position is aligned with the inner side of the metal tube 1b, so that the power density of the laser light emitted to the butted portion 18 is high. Excessive tightening can be prevented, and stable welding can be performed.
- the focal position to the inside of the metal tube 1b, once the cavity is formed, the laser light reflected by the cavity wall is condensed toward the bottom of the cavity. As a result, a deep cavity is formed, making it possible to keep the melt width almost constant and narrow the back bead width.
- the back bead can be obtained.
- the effect of spatter can be suppressed by reducing the width.
- the minimum back bead width, b min is determined by the fact that no unwelded portion remains in the butt portion 18, and the maximum back bead width, b max , is the limit at which there is no effect of spatter even after long hours of operation. determined.
- the metal tube 1b is held by the guide shoes 73, 74 at the position of the laser welding means 7, but at the position of the laser welding part 72, the butt part 18 of the metal tube 1b is held by a spring bag. , a minute gap 18a is generated as shown in FIG.
- the spring bag that produces this minute gap 18a is affected by the rigidity of the metal tube 1b, that is, the outer diameter d of the molded metal tube 1b. For example, a laser with a power of 400 (W) is emitted while a metal tube 1b made of Fe-based stainless steel with a modulus of elasticity of 18000 (kg/ nun2 ) is completely fixed.
- FIG. 9 shows the width b on the vertical axis.
- the circle indicates the case where no unwelded portion occurs, and the cross indicates the case where the unwelded portion occurs. Therefore, straight line A indicates the limit where no unwelded portion occurs, and this straight line A becomes b10d.
- a relative deflection of about ⁇ 5 ( ⁇ m) occurs between the laser beam and the minute gap 18a due to minute vibrations of the device. There was found.
- the minimum width bmin of the back bead is: L0d ⁇ 5 (m).
- the minimum width bmin of the back bead is 20 becomes ( m ).
- a metal tube 1b made of Fe-based stainless steel having a longitudinal elastic modulus of 18000 (kg/ mm2 ) was used.
- the width of the back bead should be larger than the minimum width bmin . By doing so, it is possible to perform good welding with no unwelded portions.
- straight line B shows the limit where there is no effect of spatter even after long-time operation, and this straight line is b - 1000 (t/2). Therefore, when the pipe wall thickness t is 0.1 (mm), the allowable maximum width bmin of the back bead width is 50 (m).
- the outer diameter of the metal tube 1b is 1 (mm), and the wall thickness is 0.1 (mm), the width b of the back bead is
- the influence of spatter can be suppressed and continuous welding can be performed without defective welding even during long-time operation.
- the size of the small interval 18a of the abutting portion 18 of the metal tube 1b may vary slightly depending on the extra length control conditions described separately and the method of setting the positioning portion 71 (Figs. 22A and 22B). should do. For example, as shown in Fig. 22A, the size of the minute interval 18a tends to increase, and as shown in Fig. 22B, the size tends to decrease.
- the irradiation power density is adjusted by defocusing (defocusing) the laser beam irradiated to the butted portion 18 according to the dimensions of the metal tube 1b. must be controlled.
- the welding speed is determined by the condensed diameter of the laser beam, that is, the amount of defocus and the overlap ratio.
- the back bead width b can be set to a predetermined range of 40 to 10 (m). Welding can be performed for a long time without being affected by snow and dust while suppressing the welding force.
- the defocus amount F is set in the range of 0.8 to 1.3 (mm), and the welding speed is Welding was performed with V set to 6 (m/min), and the outer diameter d of the metal tube 1b was 1.0 (mm) x tube wall thickness t was 0.1
- the defocus amount F is set to 0.7-1.1 (mm)
- welding is performed by setting the welding speed V to 10 (m/min) to achieve good welding. Can be done continuously.
- the metal tube 1c with the joint portion 18 welded and sealed in this manner is sent to the measuring portion 8.
- the passing speed of the metal pipe 1c that is, the welding speed V is measured by the speedometer 83 while being supported by the support roll stand 82, and the welding state is inspected by the eddy current flaw detector 81. be.
- the metal tube 1c that has passed through the eddy current flaw detector 81 is reduced in diameter by the squeezing means 9 to a predetermined diameter corresponding to the outer diameter of the built-in optical fiber cable 5, and becomes the metal tube-coated optical fiber cable 12.
- the diameter of the metal tube 1c is reduced by the throttling means 9, only one introduction tube 61 is inserted into the metal tube 1c until just before the eddy current flaw detector 81. c can be made thinner, and the diameter can be easily reduced.
- the metal tube-coated optical fiber cable 12 whose diameter has been reduced by the throttling means 9 passes through the tension variable means 11 and the tension adjustment means 13 and is wound on the cable winding machine 10 .
- the metal tube-coated optical fiber cable 12 When the metal tube-coated optical fiber cable 12 is wound, it is necessary to engage the sealed * diameter-reduced metal tube 1 d and the optical fiber cable 5 . Therefore, prior to continuous operation, the welded and sealed metal tube 1d is manually wound around the capstans 11a and 11b of the tension variable means 11 for a predetermined number of times. , and its tip is attached to the cable winder 10 through the tension adjusting means 13. In this state, the tip of the optical fiber cable 5 is passed up to the front of the capstan 11a, and the metal tube 1d is crushed at this position to engage the optical fiber cable 5 inside the metal tube 1d. After that, by winding the metal tube 1d while driving the capstan 11, the optical fiber 5 is pulled out from the introduction tube 61 together with the metal tube 1d to become the metal tube-covered optical fiber 12. is wound up.
- a stainless steel strip 1 with a width of 4 ⁇ and a thickness of 0.1 (mra) is used, and after being attached to a metal tube 1c with an outer diameter of 1.3 (rain), mni), the tension adjusting means 14 adjusts the tension of the metal tube 1c so that the tension of the metal tube 1c on the entry side of the capstan 11a is about 20 (kgf). Adjusting the tension on the lip 1, this tension causes an elongation of +0.30% in the metal tube 1d. At this time, for example, the tension of the optical fiber cable 5 having an outer diameter of 125C) is adjusted by the tension adjusting means 15 so that a tension of about 25 (gf) acts on the entry side of the capstan 11a. + 0.03% elongation.
- Fig. 14 shows the number of windings and the elongation rate (%) of the metal tube 1d on the vertical axis.
- curve E shows the elongation change characteristics of the metal tube 1d
- curve F shows the elongation change characteristics of the optical fiber cable 5.
- the metal tube 1d When the elongation of the optical fiber cable 5 becomes zero after one and a half windings, the metal tube 1d has an elongation of +0.19%. Immediately after the metal tube 1d is wound around the capstans 11a and 11b six times, the tension of the metal tube 1d becomes almost zero, so the elongation of the metal tube 1d also becomes almost zero. In other words, the metal tube 1d shrinks by 0.19% after winding six times more than when winding one and a half times. On the other hand, since the tension of the optical fiber cable 5 is almost zero after one and a half times of winding, there is no change in elongation after that and the length remains the same. Therefore, when wound six times, the optical fiber cable 5- is 0.19% longer than the metal tube 1d.
- capstan 11a the metal tube wrapped around the lib
- the optical fiber cable 5 engages with the inner wall of the metal tube 1d.
- the optical fiber cable 5 has an elongation amount equivalent to +0.09% with respect to the metal tube 1d.
- the force of 0.09% of this elongation is offset with the above 0.19%, and as a result the optical fiber cable 5 is 0.10% longer than the metal tube 1d.
- Curve 1 in FIG. 16 shows the change in the elongation of the metal tube 1d when the tension on the entry side of the capstan 11a of the metal tube 1d is increased.
- the length of the optical fiber cable 5 can be reduced to that of the metal tube 1d.
- the elongation of the metal tube 1d is +0.26%, and the optical fiber cable 5
- the optical fiber cable 5 can be made 0.17% longer than the metal tube 1d at the capstan output side even if the 0.09% elongation due to the winding diameter of the capstan is offset.
- the length of the optical fiber cable 5 can be made shorter than the length of the metal tube Id.
- the elongation of the optical fiber cable 5 becomes zero when it is wound five times, and the elongation of the metal tube 1d at this time is +0.04%.
- This elongation +0.04% is offset by the winding differential of the optical fiber cable 5 of 0.09%, and as a result, the optical fiber cable 5 can be made 0.05% shorter than the metal tube 1d.
- the capstan 11a, 1 lb around which the metal tube coated optical fiber cable 12 is wound multiple times, the tension adjustment means 14 for the metal strip 1, and the tension adjustment for the optical fiber cable 5 By comprehensively adjusting the means 15 and optionally the tension adjusting means 13 of the metal tube-coated optical fiber cable 12, the length of the optical fiber cable 5 relative to the metal tube 1d can be arbitrarily adjusted. can do.
- the positioning part 71 similarly to the tension adjusting means 14 of the metal strip 1, if the tension of the metal pipes lc, 1d is adjusted, the excess length can be controlled with higher accuracy. Adjustable.
- the function of controlling the excess length of the positioning part 71 in this case is the same as the function of controlling the excess length of the tension adjusting means 14 of the metal strip 1, and will not be described.
- the metal tube-coated optical fiber cable 12 is continuously manufactured while controlling the extra length to a predetermined length.
- the above embodiment explained the case where no gel is introduced into the metal tube to be coated, but when gel is introduced, the gel is supplied from the inert gas supply tube 63 of the optical fiber introduction means 6.
- gel can be introduced into the metal tube 1d using one introduction tube 61.
- inert gas or gel it is sufficient to flow the inert gas or gel at a pressure that does not apply a tensile force to the optical fiber cable 5 due to the flow of the inert gas or gel. Because, in fact, inert gas or gel This is because the insertion of the optical fiber cable 5 and control of the excess length can be achieved as intended without causing the optical fiber cable 5 to flow through the optical fiber introduction means 6.
- the optical fiber introducing means 6 is provided between the first assembly 3 and the second assembly 4 of the assembly 2, but the optical fiber introducing means 6 is arranged between the first assembly 3 and the second assembly 4. As shown in FIG. 8, it may be provided in the front stage of the first assembly 3, and the introduction tube 61 may be inserted from the front of the forming roller pair 31a in the first stage.
- an optical fiber bundle consisting of a plurality of optical fiber cables can also be introduced in the same manner.
- an optical fiber cable is guided by an introduction tube that also serves as a heat shield and is introduced into a metal tube to be coated.
- an introduction tube that also serves as a heat shield and is introduced into a metal tube to be coated.
- the maximum amount of defocusing of the laser beam irradiated to this butted portion is determined by the minimum value of the back bead width determined according to the outer diameter of the metal tube, and the minimum value of the amount of defocusing is determined by the wall thickness of the metal tube.
- the welding speed is determined according to the range between the maximum and minimum values of the defocus amount, and the laser beam is defocused within the range of the defocus amount.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019910700831A KR960003727B1 (ko) | 1989-12-05 | 1990-12-05 | 금속관 피복 광 파이버 케이블의 제조장치 및 제조 방법 |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1/314295 | 1989-12-05 | ||
| JP31429589 | 1989-12-05 | ||
| JP19071490 | 1990-07-20 | ||
| JP2/190714 | 1990-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1991008079A1 true WO1991008079A1 (en) | 1991-06-13 |
Family
ID=26506261
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1990/001579 Ceased WO1991008079A1 (en) | 1989-12-05 | 1990-12-05 | Method and apparatus for manufacturing metal pipe clad optical fiber cable |
| PCT/JP1990/001578 Ceased WO1991008500A1 (en) | 1989-12-05 | 1990-12-05 | Apparatus for and method of manufacturing optical fiber cable covered with metal pipe |
| PCT/JP1990/001580 Ceased WO1991008501A1 (fr) | 1989-12-05 | 1990-12-05 | Appareil et procede de fabrication d'un cable de fibres optiques revetu d'un tuyau metallique |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1990/001578 Ceased WO1991008500A1 (en) | 1989-12-05 | 1990-12-05 | Apparatus for and method of manufacturing optical fiber cable covered with metal pipe |
| PCT/JP1990/001580 Ceased WO1991008501A1 (fr) | 1989-12-05 | 1990-12-05 | Appareil et procede de fabrication d'un cable de fibres optiques revetu d'un tuyau metallique |
Country Status (6)
| Country | Link |
|---|---|
| US (6) | US5231260A (ja) |
| EP (3) | EP0456836A4 (ja) |
| JP (2) | JP2505335B2 (ja) |
| KR (3) | KR940008679B1 (ja) |
| CA (3) | CA2046622A1 (ja) |
| WO (3) | WO1991008079A1 (ja) |
Families Citing this family (37)
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|---|---|---|---|---|
| US5231260A (en) * | 1989-12-05 | 1993-07-27 | Nkk Corporation | Apparatus for manufacturing metal tube covered optical fiber cable and method therefor |
| US5418877A (en) * | 1992-10-07 | 1995-05-23 | Siemens Aktiengesellschaft | Method and apparatus for introducing a light waveguide into a tubular envelope |
| DE59402330D1 (de) * | 1993-02-17 | 1997-05-15 | Kabelmetal Electro Gmbh | Verfahren zur Herstellung eines Koaxialkabels |
| US5318215A (en) * | 1993-02-23 | 1994-06-07 | Hitachi Cable Ltd. | Method of forming cladded cable having fiber with excess length enclosed therein |
| FR2722717B1 (fr) * | 1994-07-22 | 1996-09-20 | Alcatel Cable | Procede et ligne de reparation d'un defaut de fermeture d'un tube metallique contenant au moins une fibre optiue de transmission |
| DE4434134A1 (de) * | 1994-09-24 | 1996-03-28 | Kabelmetal Electro Gmbh | Verfahren zur Herstellung eines längsnahtgeschweißten Metallrohres |
| DE4434133A1 (de) * | 1994-09-24 | 1996-03-28 | Kabelmetal Electro Gmbh | Verfahren zur Herstellung eines optischen Kabels aus einem Metallrohr |
| FR2725530B1 (fr) * | 1994-10-07 | 1996-11-22 | Alcatel Submarcom | Ensemble de protection contre l'echauffement interne d'un tube metallique contenant au moins une fibre optique et procede de mise en oeuvre |
| JP2950180B2 (ja) * | 1995-02-14 | 1999-09-20 | 日本鋼管株式会社 | 金属管被覆光ファイバケーブルの製造方法及び製造装置 |
| JP2970456B2 (ja) * | 1995-02-14 | 1999-11-02 | 日本鋼管株式会社 | 金属管被覆光ファイバケーブルの製造方法及び製造装置 |
| JP3233542B2 (ja) | 1995-02-14 | 2001-11-26 | 株式会社オーシーシー | 金属管被覆光ファイバケーブルの製造方法及び製造装置 |
| FI117066B (fi) * | 1995-07-06 | 2006-05-31 | Nokia Kaapeli Oy | Menetelmä ja sovitelma optisten kuitujen tension tasaamiseksi |
| DE19642542B4 (de) * | 1995-11-16 | 2010-07-29 | Norddeutsche Seekabelwerke Gmbh & Co. Kg | Vorrichtung sowie Verfahren zur Erzeugung von Überlängen eines Lichtwellenleiters gegenüber einem metallischen Röhrchen |
| FR2748678B1 (fr) * | 1996-05-14 | 1998-06-19 | Alcatel Submarcom | Ligne de soudage etanche en long d'un tube metallique |
| US5971629A (en) | 1996-07-12 | 1999-10-26 | Bloom; Cary | Apparatus and method bonding optical fiber and/or device to external element using compliant material interface |
| FR2752066B1 (fr) * | 1996-08-01 | 1998-09-04 | Alcatel Submarcom | Procede d'obtention de surlongueur de fibres optiques dans un tube metallique de protection et ligne de mise en oeuvre |
| JP3500037B2 (ja) | 1997-05-09 | 2004-02-23 | 株式会社オーシーシー | 熱敏感物質の導入装置 |
| JPH10328867A (ja) * | 1997-06-05 | 1998-12-15 | Mitsubishi Electric Corp | レーザビーム加工装置およびレーザビーム加工装置用の焦点位置決め治具およびレーザビーム集光直径測定治具 |
| GB2331160A (en) * | 1997-10-21 | 1999-05-12 | Bicc Plc | Manufacture of optical fibres and gel in welded metal tube |
| ATE193851T1 (de) * | 1998-02-06 | 2000-06-15 | Swisscab Sa | Verfahren zur herstellung eines metallischen mantelrohrs wobei kontrolliert wird, dass eine fehlerfreie schweissverbindung erzeugt wurde sowie vorrichtung zur durchführung des verfahrens |
| DE19816998A1 (de) * | 1998-04-17 | 1999-10-21 | Alcatel Sa | Verfahren zur Herstellung eines optischen Kabels |
| US6148925A (en) * | 1999-02-12 | 2000-11-21 | Moore; Boyd B. | Method of making a conductive downhole wire line system |
| EP1208397B1 (en) | 1999-07-28 | 2003-02-26 | PIRELLI CAVI E SISTEMI S.p.A. | Submarine optical cable resistant to longitudinal water propagation |
| US6557249B1 (en) * | 2000-04-22 | 2003-05-06 | Halliburton Energy Services, Inc. | Optical fiber deployment system and cable |
| FR2833195B1 (fr) * | 2001-12-07 | 2004-01-30 | Giat Ind Sa | Procede de mise en place d'un revetement de protection sur la paroi interne d'un tube, tube et notamment tube d'arme realise suivant ce procede |
| JP4149716B2 (ja) * | 2002-03-01 | 2008-09-17 | 株式会社フジクラ | 光ファイバコードの製造方法及びその装置 |
| NO20041392D0 (no) * | 2004-04-02 | 2004-04-02 | Nexans | Optisk kabelenhet og fremgangsmate for fremstilling derav |
| US20060127020A1 (en) * | 2004-12-10 | 2006-06-15 | Samsung Electronics Co.; Ltd | Apparatus for fabricating optical fiber cable |
| US8326103B2 (en) * | 2008-04-04 | 2012-12-04 | Baker Hughes Incorporated | Cable and method |
| US10052721B2 (en) * | 2014-09-17 | 2018-08-21 | Magna International Inc. | Method of laser welding coated steel sheets with addition of alloying elements |
| GB2543319A (en) | 2015-10-14 | 2017-04-19 | Heraeus Electro Nite Int | Cored wire, method and device for the production |
| CN106569307A (zh) * | 2016-11-03 | 2017-04-19 | 江苏中天科技股份有限公司 | 一种光缆纵包钢带或铝带自动焊接装置用斜向移动装置 |
| DE102018209143A1 (de) * | 2018-06-08 | 2019-12-12 | Robert Bosch Gmbh | Verfahren zur Herstellung einer stoffschlüssigen Laserbondverbindung sowie Vorrichtung zur Ausbildung einer Laserbondverbindung |
| CN109143510B (zh) * | 2018-10-15 | 2024-01-05 | 富通集团(嘉善)通信技术有限公司 | 连续化生产光缆的方法以及系统 |
| EP3797891B1 (de) * | 2019-09-30 | 2023-08-02 | Nexans | Verfahren zur kontinuierlichen herstellung abschnittsweise gewellter, dünnwandiger hohlprofile kleiner durchmesser aus ne-metallen |
| EP3797890B1 (de) * | 2019-09-30 | 2024-03-27 | Nexans | Verfahren zur herstellung dünnwandiger hohlprofile kleiner durchmesser aus ne-metallen |
| EP3832365B1 (de) * | 2019-12-05 | 2023-08-30 | Nexans | Verfahren zur kontinuierlichen herstellung von in einem perforierten metall-hohlprofil gelagerten optischen faserleiter-sensoren |
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| JPS6435514A (en) * | 1987-07-16 | 1989-02-06 | K Tube Corp | Apparatus and method for producing sheathed optical fiber cable continuously |
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| IT1115656B (it) * | 1977-05-04 | 1986-02-03 | Pirelli | Metodo di produzione di elementi componenti cavi di telecomunicazione e impianto atto a realizzarlo |
| JPS542142A (en) * | 1977-06-07 | 1979-01-09 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber cable and production of the same |
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-
1990
- 1990-12-05 US US07/741,400 patent/US5231260A/en not_active Expired - Lifetime
- 1990-12-05 KR KR1019910700833A patent/KR940008679B1/ko not_active Expired - Fee Related
- 1990-12-05 KR KR1019910700831A patent/KR960003727B1/ko not_active Expired - Fee Related
- 1990-12-05 CA CA002046622A patent/CA2046622A1/en not_active Abandoned
- 1990-12-05 WO PCT/JP1990/001579 patent/WO1991008079A1/ja not_active Ceased
- 1990-12-05 CA CA002046623A patent/CA2046623A1/en not_active Abandoned
- 1990-12-05 EP EP19910900054 patent/EP0456836A4/en not_active Withdrawn
- 1990-12-05 JP JP3500690A patent/JP2505335B2/ja not_active Expired - Lifetime
- 1990-12-05 WO PCT/JP1990/001578 patent/WO1991008500A1/ja not_active Ceased
- 1990-12-05 CA CA002046319A patent/CA2046319A1/en not_active Abandoned
- 1990-12-05 KR KR1019910700832A patent/KR940008678B1/ko not_active Expired - Fee Related
- 1990-12-05 US US07/730,915 patent/US5210391A/en not_active Expired - Lifetime
- 1990-12-05 WO PCT/JP1990/001580 patent/WO1991008501A1/ja not_active Ceased
- 1990-12-05 EP EP19910900056 patent/EP0465656A4/en not_active Withdrawn
- 1990-12-05 JP JP3500689A patent/JP2505334B2/ja not_active Expired - Lifetime
- 1990-12-05 US US07/730,891 patent/US5241153A/en not_active Expired - Lifetime
- 1990-12-05 EP EP19910900055 patent/EP0457915A4/en not_active Withdrawn
-
1993
- 1993-04-19 US US08/049,510 patent/US5380977A/en not_active Expired - Lifetime
- 1993-06-16 US US08/078,394 patent/US5426277A/en not_active Expired - Lifetime
- 1993-06-17 US US08/078,574 patent/US5440095A/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6435514A (en) * | 1987-07-16 | 1989-02-06 | K Tube Corp | Apparatus and method for producing sheathed optical fiber cable continuously |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0456836A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2505334B2 (ja) | 1996-06-05 |
| WO1991008500A1 (en) | 1991-06-13 |
| WO1991008501A1 (fr) | 1991-06-13 |
| JPH04503333A (ja) | 1992-06-18 |
| KR940008679B1 (ko) | 1994-09-24 |
| JP2505335B2 (ja) | 1996-06-05 |
| US5231260A (en) | 1993-07-27 |
| KR920701850A (ko) | 1992-08-12 |
| US5380977A (en) | 1995-01-10 |
| US5241153A (en) | 1993-08-31 |
| KR920701851A (ko) | 1992-08-12 |
| CA2046319A1 (en) | 1991-06-06 |
| EP0457915A4 (en) | 1992-10-07 |
| KR920700838A (ko) | 1992-08-10 |
| KR940008678B1 (ko) | 1994-09-24 |
| US5426277A (en) | 1995-06-20 |
| CA2046622A1 (en) | 1991-06-06 |
| EP0465656A1 (en) | 1992-01-15 |
| EP0456836A1 (en) | 1991-11-21 |
| EP0456836A4 (en) | 1992-06-03 |
| KR960003727B1 (ko) | 1996-03-21 |
| EP0457915A1 (en) | 1991-11-27 |
| US5440095A (en) | 1995-08-08 |
| US5210391A (en) | 1993-05-11 |
| EP0465656A4 (en) | 1992-06-03 |
| CA2046623A1 (en) | 1991-06-06 |
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