JPH067211B2 - Method for manufacturing metal spacer for transmission medium - Google Patents

Description

The present invention relates to a method for manufacturing a metal spacer that holds a transmission medium such as an optical fiber in a communication cable or the like.

<Prior art> Conventionally, a transmission cable holder using fibers or the like is a metal holder made of aluminum or the like for the purpose of a lightning protection effect when a power line is installed on a steel tower in addition to a resin wire rod. As shown in FIG. 4, the spacer 3 of the cable 1 has a plurality of spiral (or corrugated) transmission medium accommodating grooves 4 continuously formed on the outer periphery of a metal linear body. The optical fiber 5 is housed in the groove 4 and the outer circumference thereof is covered with the jacket 6.

In order to manufacture these spacers 3, a linear body that continuously moves in the axial direction is provided with a die corresponding to its cross section, and the linear body is drawn while rotating or rotating it forward or reverse. The transmission medium accommodating groove 4 is formed by pressing on the peripheral surface of the body.

<Problems to be solved by the invention> However, according to the conventional method as described above, in the groove processing by the rotary die, the wire diameter is changed in the drawing process,
If the processing accuracy is poor, such as when the groove width and the depth become uneven, there are some drawbacks, and there is a problem that the hardness of each part of the linear body changes.

On the other hand, in order to solve the drawback of the drawing process, there is a method of cutting a preformed linear body with a cutter to form a groove. According to this method, the above-mentioned problem of processing accuracy can be overcome, but when a metal linear body is cut by a cutter, cutting traces remain in the groove or burrs are generated at the edge of the groove, so these cutting There is a problem that the transmission medium accommodated in the groove is damaged by the marks and burrs. Further, after the cutting process, there is a problem that the linear body is glossy and it is difficult to discriminate the groove portion, so that it is difficult to wind up the transmission medium in the subsequent step.

<Means for Solving the Problems> The present invention for solving the above-described problems forms a metal linear body 15 having a certain rigidity, and the linear body 15 is formed.
A method of forming a transmission medium accommodating groove 4 continuous in the axial direction on the peripheral surface of the linear medium (15) having a cutting blade at least in the periphery thereof by the rotational force and by the cutting blade. A cutter (32) for performing the cutting process of (4) is prepared, and the peripheral surface of the linear body 15 that moves in the axial direction is cut and formed by the cutter 32, and the linear body 15 is formed. After the cutter 32 is revolved in one direction or in two forward and backward directions as the center, the transmission medium accommodating groove 4 is formed into a spiral or corrugated shape, and then the linear body 15 is formed.
The surface treatment is performed by colliding fine particles with the surface of the.

<Operation> While the linear body 15 is sent at a relatively high speed, the transmission medium accommodating groove 4 is cut and formed by the cutter 32 that generates a cutting force by rotation, but the cutting process is also usually made of metal or ceramic. Due to the different cutter 32, the cutting itself is carried out at a high speed with a light load. Therefore, the linear body (15)
It is not necessary to apply a large tensile force for groove cutting to the linear body (15), and the linear body (15) only needs to be provided with a small tensile force for transfer.
Since a large force is not applied to 5), the linear body (15) is not deformed as in the conventional case, and the linear body (15) with high accuracy can be manufactured. Further, the grooving is performed accurately and with high accuracy according to the shape of the cutting edge of the cutter 32, and the groove is not deformed even after the cutting and is maintained in the state at the time of cutting. After the accommodation groove 4 is formed, the sprayed fine particles collide with the surface to remove burrs and cutting traces generated by the cutting process, and the gloss disappears.

<Embodiment> The embodiment of the present invention shown in the drawings will be described in detail below.
The figure shows a layout of the apparatus of the production line for carrying out the method of the present invention, the linear body 15 is linearly fed from the drum of the feeding machine 11 at a constant speed, and the line fed from the feeder 17. The body 15 is inserted into the groove cutting device 18, and then linearly passes while being pulled out from the feeder 19.

A ring-shaped rotary frame 30 as shown in FIGS. 1 and 2 is arranged in the groove cutting device 18 so as to be concentric with the linear body 15. A plurality of (six in the drawing) driving machines 31 composed of motors and the like are mounted in the rotary frame 30 at equal angular intervals. Formed circular cutter (milling cutter)
32 are pivotally supported. As shown in FIG. 2, each of the cutters 32 is axially supported in a radial manner with the tips of their peripheral surfaces facing each other in the direction of the center of the linear body 15. That is, the cutters 32 are arranged so as to bite into the peripheral surface of the linear body 15 corresponding to the position and shape of the groove 4 to be formed in the linear body 15 at the tips of the teeth facing each other. Each cutter 32 is rotated at high speed by each drive 31 (in the illustrated example, the linear body 15 is rotated in the traveling direction =
The transmission medium accommodating groove (4) of the linear body (15) is cut and formed by the peripheral cutting blade by this rotational force. At this time, in order to cool the frictional heat of the cutter and improve the machining accuracy, the cutting fluid is continuously supplied with a cutting fluid 14 such as cutting oil or in an oil bath.

On the other hand, a rotary machine 35 including a motor is attached to the frame 34 of the groove cutting device 18, and a small-diameter gear 36 that is attached to and driven by the rotary machine 35 is fixedly provided on the outer periphery of the rotary frame 30. It meshes with gear 37. By this mechanism, the rotating frame 30 itself also revolves around the linear body 15.
By such an operation, the spiral groove 4 is cut and formed on the peripheral surface of the linear body.

A surface treatment device 41 is provided between the feeder 19 and the next drawer feeder 21.
And a post-processing device 20 are provided.

FIG. 5 is a side sectional view showing an internal main part of the surface treatment apparatus 41. As described above, the linear body 15 in which the housing groove 4 is formed by the cutter 32 is used in the next step, the surface treatment apparatus.
Sent into 41. In the surface treatment apparatus 41 of the present embodiment, as shown in FIG. 6, three nozzle groups 43, 45, 47, which are attached so as to face each other in the axial direction from the four sides, are provided side by side in the axial direction. Has been. Each nozzle 43a, 43b, 43c, 43d, ...
From the tip of, the treatment liquid in which fine ceramic particles and water are mixed is jetted toward the surface of the linear body 15 at high pressure. The injection angles of the nozzle groups 43, 45, 47 are provided so as to be displaced by approximately 30 degrees, and the peripheral surface of the linear body 15 is uniformly hit with the ceramic particles.

By the ceramic particles colliding with the peripheral surface at high speed,
Fine irregularities are formed on the surface of the linear body 15, burrs and cutting marks are erased, and gloss is lost. In addition, most of the ceramic particles are washed away by the mixed and sprayed water. The ceramic particles ejected from the nozzle are separated from the removed burr fragments and the like, recovered, and reused. Numerals 49 and 51 shown in FIG. 3 are storage tanks of ceramic particles and water to be sprayed, and they are mixed at a constant ratio during spraying. Here, the particles injected toward the linear body 15 may be not only ceramic particles but also metal particles having a predetermined hardness and mass.

Although the spacer 3 is completed by the above-described processing, since the cutting fluid and the ceramic particles adhered during cutting remain on the surface of the spacer 3, cleaning, drying, and other operations are performed to remove it. The spacer 3 for which the post-treatment process has been completed is sequentially wound around the drum of the winder 22 and accommodated therein.

The lead pitch of the spiral groove in the cutting step is determined by the feed speed of the linear body 15 and the rotation speed of the rotary frame 30, and when the rotation of the rotary frame 30 is changed to either one of the spirals, the spiral groove is formed. , And the corrugated grooves 4 are formed on the peripheral surface of the linear body 15 by alternately rotating the grooves in reverse.

When forming these grooves by cutting, if the cutter 32 is oriented in the feeding direction (axial direction) of the linear body 15,
When the cutter diameter is large and there is a deviation between the direction of 32 and the lead angle of the spiral of groove 4, the cross section of groove 4 is the cutter 32.
May not necessarily correspond to the shape of the cutting edge. In order to solve these problems, the cutter 32 and the driving machine 31 are rotated by a certain angle with respect to the rotating frame 30 so that the direction of the cutter 32 is oriented in the spiral direction of the groove 4, or the rotating frame 30 is adjusted. A mechanism (not shown) that rotates in response to the rotation speed and the rotation direction so as to correspond to the lead angle.
It is also possible to

FIG. 7 shows another embodiment of the groove cutting device 18, in which the cutter 32 mounted in the rotary frame 30 is a slot cutter, and the cutter shaft 33 projects from the driving machine 31 in the centripetal direction. It has a mechanism that rotates at high speed. In this case, in addition to the shape shown in FIG. 8 (A), the groove 4 with a narrow inlet cross section as shown in FIGS. 8 (B) and (C) Can also be formed.

The embodiment used in the method of the present invention is not limited to the device according to the above embodiment, and for example, the rotary drive mechanism for revolving or rotating the rotary frame 30 or the cutter 32 such as the groove cutting device 18 or the like as illustrated. In addition to driving the motors separately for each unit, an interlocking mechanism using a single power source is also possible.

Further, if the cutting processes such as rough cutting and finish roughing are performed separately, it is possible to perform more accurate processing.

<Effects of the Invention> According to the method of the present invention configured as described above, since the linear body once formed and hardened is cut, the processing accuracy becomes extremely high and the hardness becomes uniform. . For this reason, the yield of products is significantly improved, and expensive inspection equipment for checking defective products, cost and labor are greatly reduced.

Further, since the surface treatment is performed after cutting, burrs and cutting marks formed in the groove are erased and the gloss is lost, so that the groove can be easily discriminated and the workability of winding the transmission medium is improved. Further, troubles such as burr damage to the transmission medium are reduced.

[Brief description of drawings]

The drawings show an apparatus used for practicing the present invention. FIGS. 1 and 2 are front sectional views and side sectional views of essential portions of the above apparatus, and FIG. 3 is an apparatus layout diagram of a spacer manufacturing line.
The figure is an enlarged perspective view showing an example of the structure of a transmission cable.
FIG. 7 is a side sectional view of a main part of the surface treatment mounting, FIG. 6 is a side perspective view of the same, FIG. 7 is a side sectional view of a main part showing an example of another embodiment, and FIG. 8 is a transmission medium accommodating groove of a spacer. It is sectional drawing which shows the example of a shape. 1: Cable 3: Spacer 4: Groove 5: Optical fiber 14: Cutting fluid 15: Linear body 18: Grooving device 20: Post-treatment device 32: Cutter 41: Surface treatment device 43,45,47: Nozzle group 43a, b , c, d: nozzle 45a, b, c, d: nozzle 47a, b, c, d: nozzle

Claims (1)

[Claims] 1. A metal linear body (1) having a certain rigidity.
5) and forming a transmission medium accommodating groove (4) continuous in the axial direction around the linear body (15), the cutting blade having at least a peripheral portion, and the cutting blade is formed by a rotational force. Then, a cutter (32) for cutting the transmission medium accommodating groove (4) of the linear body (15) is prepared, and the cutter (3) is provided around the axially movable linear body (15).
The transmission medium accommodating groove (4) is cut and formed by 2), and the cutter (32) is revolved around the linear body (15) in one direction or two forward and backward directions, thereby forming the transmission medium accommodating groove. A method for producing a metal spacer for a transmission medium, comprising forming (4) into a spiral or corrugation, and then subjecting the surface of the linear body (15) to fine particles for surface treatment.