JPS58128221A - Manufacture of metallic pipe from metallic tape and jig for repairing unwelded part of metallic pipe - Google Patents

Abstract

PURPOSE:To prevent cutting of pipes and to ensure continuous operation of the line by repairing seams of metallic pipes and adjusting thrust with a repairing jig at a position where the pipe comes out from each reducing die while the line is running by sending out. CONSTITUTION:When a thrusted part 14-1 and a break 14-2 are generated in a metallic pipe 13 formed from a metallic tape, a jig 15 is applied to the metallic pipe 13, and the break 14-2 is lowered and the thrusted part 14-1 is smoothed. By this way, catching of deformed part by the die and consequent cutting of the pipe can be prevented and normal line speed can be restored quickly by adjusting a dancer roll. As a jig for repair, for instance, a plierslike jig in which the head forms a press-fixing forming part consisting of trigonal columnar male body 16 and an arcuate female body 17 with grips 18, 19 and pivotally fitted 20 turnably between both grips 18 and 19 at the lower end of the head.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal tube of a unique diameter from a metal tape, and in particular improves the manufacturing start state (starting state) before operating the production line at a steady linear speed. The present invention also relates to a jig for repairing the unwelded portion of a metal pipe, which is used as a repair tool.

When manufacturing metal tubes using metal tape as a starting material, long ones with relatively thin walls and small diameters can be obtained, and metal tubes with built-in linear bodies such as small-diameter electric wires can also be manufactured if necessary. This is a very useful method.

The inventors previously developed a method for manufacturing a metal tube as shown in FIG. Figure 1 is a schematic diagram of the process in which a linear body is built in. A linear body 1 is fed out from a reel 2, and at the same time aluminum and
A metal tape 3 made of copper or the like is sent out from a roll 4, passes through a guide roller 5, and is vertically attached by a forming unit.

The forming unit is a series of devices including a metal tape slitter, an edge treatment roll, a plate die, and a forming die, so that the linear body 1 is housed in a metal tube.

The mating ends of the metal tubes are then welded with a torch, and the first
It is towed by the caterpillar traction button device 10 of
It enters the pigeon diameter gouy plug device 8 and the triclean cleaning device 9, and is further towed by the second caterpillar pull device 10', and the length of the diameter reduction die 8 and the tri-cleaning device is at least 50 m.
In order to adjust the tension between the metals, dancer rolls 12° and 12' are provided at the long span locations as shown.

Note that this production line is a tandem line, so *I
As a result of a detailed but preliminary study, it was found that the system had the following drawbacks at the initial stage.

In other words, at the initial stage, the formed and reduced diameter metal tube is advanced until it passes through the final die, and then, at the stage when it can be operated at a steady linear speed, the unwelded portion of the metal tube (the metal tape butt For example, the unwelded portion of the metal tube 13 is initially 30 mm at the bottom of the torch.
m (in the case of a metal tube with a diameter of 15 mm) is expanded by diameter reduction, and the joint is as shown in Figure 2. Totoru.

Due to this digging, for example, the diameter reduction schedule is 15 times the diameter of the metal pipe → 12.4 mm -= 9.5 times → 6
When changing from 8 peeps to 5 and Otmn, it was found that all the pipes at 5()chi were cut off at the stage of 6.8 tm, and 100 pipes were cut off at the stage of 5.0 m+n.

As a result of various studies, the inventors of the present invention found that pipe breakage can be caused by repairing the joints of the metal pipes using a repair jig at the point where they exit each diameter-reducing die while the line is running during lead-out, and by repairing the bite. This enables continuous operation of the line without any problems.

That is, to explain this state with reference to Figure 3, Figure 3 (A) is a top view of the metal tube with the biting part 14-1 and the cut part 14-2, and this is a cross-sectional view of the same figure (B). As shown in the figure, a jig 15 is applied to the cut portion 14 of the metal tube 13 to repair it. As a result, as shown in the side view of FIG.
If 4-1 is repaired so that it is smooth, the metal tube will advance without getting caught in the die and the dancer roll will be adjusted, whereas in the past the deformed part would get caught in the die and break the pipe. can quickly shift to steady linear velocity. According to the present invention, all repairs of metal tubes can be carried out while the line is running, so production efficiency is significantly improved.

An example of the jig used for this repair according to the present invention is shown in FIG. That is, a male body 16 whose head is shaped like a triangular prism,
A crimping shaping part consisting of a circular arc-shaped female body 17 corresponding to this, and grip parts 18 and 19 at the bottom of each head.
are provided, and both are pliers-like jigs that are pivotally connected 20 between the two grips at the lower end of the head. Therefore, by applying the concave part of the circular female body 17 of the head to the lower surface of the metal tube, and applying the triangular prism-shaped male body 16 to the abutting part, that is, the upper surface of the metal tube, and lightly caulking, the opening can be easily performed. Repairs as shown in Figure 3 can be made.

Naoto's jig is usually about 176n in length, relatively lighter than an ordinary bench, easy to handle with one hand, and does not break down.

As described above, according to the present invention, the steady operation of the line can be started quickly, the sunrise loss is extremely small, and it is possible to contribute to lowering product costs.

[Brief explanation of drawings]

Figure 1 is a process schematic diagram showing the metal tube manufacturing line, Figure 2 is a top view showing the state of the metal tube at sunrise, and Figure 3 is the
Figure (A) is a top view of an example of the state of the metal pipe before repair, (B) is a cross-sectional view of the state in which it is repaired with a jig, (C) is a side view of the state in which it has been repaired, and Figure 4 is the book. FIG. 2 is a side view showing a structural example of a jig used in the method of the invention. 13 Metal pipe 14 Biting part 14-1
Biting part 14-2 Cut part 15 Jig 16 Male body (head) 17 Female body (head) 18.
19 Grip 20 Central Patent applicant Fujikura Electric Cable Co., Ltd. Agent Patent attorney Mamoru Takeuchi

Claims (2)

[Claims] (1) A method of manufacturing a metal tube from a metal tape in a method of manufacturing a metal tube by forming a metal tape into a circular tube shape and welding the mating ends to reduce the diameter. (2) The head consists of a crimp-bonded part consisting of a triangular prism-shaped male body and an arc-shaped female body, each of which is provided with a grip part,
A jig for repairing an unwelded part of a metal pipe, characterized in that both grip parts are rotatably pivoted. ′