JPH10225726A - Production of thin wall tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily judge the tension state of a metal sheet part and to regulate it to a requiring tension by knocking the metal sheet part between rolls of a forming roll group lying mutually in front and the rear, detecting its sound of vibration and regulating the tension of the metal sheet part between the rolls. SOLUTION: A thin wall metal sheet M is passed through a forming roll group F and a thin wall tube is produced by heating both edge parts e, e, press- contacting them and butt welding them with squeeze rolls 11a, 11b. In this time, the tensions of the metal sheet parts (m) between respective rolls 1a, 1b to 11a, 11b lying mutually in front and the rear of the forming group F are set to respectively requiring corresponding to the wall thickness or the quality, etc., of the thin wall metal sheet M. For its setting, when each metal sheet part (m) between respective rolls 1a, 1b to 11a, 11b is laid in the most suitable tension state, by knocking the edge part (e) with a knocking bar, etc., the sound of vibration is detected and stored, based on the detected sound of vibration, the tension of the metal sheet part (m) is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thin-walled metal plate which is formed into a tubular shape by passing a thin-walled metal plate through a series of forming rolls and butt-welding both edges thereof. It is.

[0002]

2. Description of the Related Art In the manufacture of such a thin-walled tube, in order to form a thin-walled tube in a roll and perform stable continuous welding, it is required that both edges of a thin-walled metal plate to be butt-pressed be stabilized. You. In other words, when the thin metal plate passes through a series of forming roll groups, if the tension of the metal plate between the rolls is too weak or too strong, the pressure contact state of both edges at the butt weld is unstable. Therefore, good welding cannot be performed. For this reason, it is necessary to set and manage the tension of the metal plate between the rolls as desired according to the thickness, diameter, material, and the like of the thin tube to be formed.

[0003] Conventionally, the tension state of the metal plate portion between the successive rolls of the forming roll group is visually judged by an operator, and the adjustment and management of the tension are performed accordingly. However, the buckling phenomenon of the edge part due to insufficient tension can be visually observed, but it is very difficult to judge the over tension of the edge part by appearance.

An object of the present invention is to provide a method for manufacturing a thin-walled tube in which the tension state of a metal plate portion between rolls can be easily determined, whereby the desired tension can be adjusted.

[0005]

A first aspect of the present invention is to form a thin metal plate M into a tubular shape by passing it through a series of forming rolls F, and butt-welding the two edge portions e, e. In the method for manufacturing a thin-walled pipe, the vibration of the metal plate m between the adjacent rolls of the forming roll group F is detected by detecting the vibration sound, and the detected sound is used to detect the tension of the metal plate m between the rolls. Is adjusted.

According to the present invention, when the metal plate portion m between the rolls is in the most preferable tension state, an operator hits the metal plate portion m with a hitting bar or the like, and the vibration sound is detected by hearing. Then, the tension of the metal plate portion m is adjusted based on the stored vibration sound. This adjustment may be performed by appropriately displacing each roll vertically or horizontally to change the contact pressure of each roll with respect to each metal plate portion m of the thin metal plate M.

According to a second aspect of the present invention, in the method for manufacturing a thin-walled tube according to the first aspect, a vibration sound when the metal plate portion m between the rolls has a desired tension is recorded by a recorder, and the reproduced sound is recorded. The tension of the metal plate portion m between the rolls is adjusted based on this. In this case, an ordinary tape recorder may be used as the recorder.

[0008]

FIG. 1 shows a forming roll group F for roll forming a thin metal plate M. The forming roll group F is for forming a strip-shaped thin metal plate M into a gradually tubular shape. A pair of upper and lower breakdown rolls 1 arranged along the traveling direction of the thin metal plate M
a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, a pair of left and right side rolls 5a, 5b, 6a, 6b, respectively.
7a, 7b, a pair of upper and lower fin path rolls 8 respectively
a, 8b, 9a, 9b, 10a, 10b and a pair of left and right squeeze rolls 11a, 11b. The roll pairs 1a, 1b to 11a, 1b are respectively driven to rotate in opposite directions to move the metal plate M forward. To be transferred to

As shown in FIG. 1, on the front side of the squeeze rolls 11a and 11b, a butt resistance for butt-welding the two edge portions e and e of the circular tube portion Mo in which a thin metal plate M is formed into a tubular shape. High frequency coil 12 of welding means
Is disposed so as to surround the circular tube portion Mo.
This butt resistance welding means comprises a known high-frequency induction resistance welding device. Also, the squeeze rolls 11a, 1
In front of 1b, there is provided a cutting tool 13 for cutting the outer weld bead bulge B1 of the welded portion W of the butt welded circular tube portion Mo.

Next, a method for manufacturing a thin-walled tube using the above-described forming roll group F will be described. In addition, as the thin metal plate M used in this manufacturing method, for example,
Galvanized plate thickness 1.2mm (net thickness 1.15m
m), a thin steel plate having a width of 350 mm (trade name: Sumitomo Galfan) is used.

First, the thin metal plate M is passed through a forming roll group F shown in FIG.
Are gradually formed into a tubular shape such that both edge portions e, e thereof approach each other directly above the center portion in the width direction (see FIG. 2).
), And a high-frequency current flowing through the high-frequency coil 12 of the high-frequency induction resistance welding device generates a circumferential electromotive force in the circular tube portion Mo immediately below the coil 12 in the circular tube portion Mo, so that the induced current flows. The induced current concentrates on the opposing surfaces of the two adjacent edge portions e and e of the circular tube portion Mo, and heats the two edge portions e and e to the welding temperature.
When the outer periphery of o is pressed against the squeeze rolls 11a and 11b, both edges e and e are butt-pressed and welded as shown in FIG. The butt weld is indicated by W in FIGS.

As described above, the circular pipe portion Mo with the both edge portions e, butt-welded is connected to the squeeze rolls 11a, 1a.
Immediately after exiting 1b, the outer bead protruding portion B1 of the butt weld W is cut off by the cutting bit 13, and this bit cut state is shown in FIG. Welded part W
Is left as it is.

As described above, the thin metal plate M is passed through the forming roll group F, and both edges e and e are heated and pressed against each other by the squeeze rolls 11a and 11b to butt-weld them, thereby obtaining a thin wall as shown in FIG. The tube Mo is manufactured. When manufacturing the thin-walled tube Mo,
Each roll pair 1a before and after the forming roll group F,
The tension of the metal plate portion m between 1b to 11a and 1b is set as desired according to the thickness and material of the thin metal plate M.

In setting the tension, when each metal plate portion m between each pair of rolls 1a, 1b to 11a, 1b is in the most preferable tension state, an operator applies an edge portion e of the metal plate portion m. By hitting with a hitting bar or the like, the vibration sound is detected by hearing and stored, and the tension of the metal plate portion m is adjusted based on the stored vibration sound. The adjustment of the tension is performed, for example, as shown in FIGS.
That is, FIG. 3 shows, for example, a pair of upper and lower breakdown rolls 3.
a, 3b, by rotating the lower screw operation unit 15 to move the lower roll shaft 13 up and down, and by rotating the upper screw operation unit 16 to move the upper roll shaft 14 up and down, etc. And this roll 3
The contact pressure of the rolls 3a, 3b with respect to the metal plate m of the thin metal plate M passing between a, 3b is appropriately adjusted. The other upper and lower roll pairs are adjusted similarly.

FIG. 4 shows a pair of left and right side rolls 5.
a and 5b, and the left and right rolls 5a and 5b
Since the screw shaft 17 is supported by non-rotating nut members 18a and 18b screwed to left and right reverse screw portions 17a and 17b, respectively, the screw shaft 17 is rotated forward and reverse to rotate the left and right side rolls 5a and 5b. The contact pressure of the rolls 5a, 5b against the thin metal plate M passing through the left and right side rolls 5a, 5b is adjusted. The other right and left roll pairs are similarly adjusted.

While adjusting the rolls as described above, while detecting the vibration sound of each metal plate m, each roll pair 1a,
The tension of each metal plate portion m is set so as to emit a vibration sound when each metal plate portion m between 1b to 11a and 1b is in the most preferable tension state.

In addition, although it takes considerable skill for an operator to memorize the vibration sound when each metal plate portion m is in the most preferable tension state, it is necessary for the operator to memorize the vibration sound. By recording the vibration sound on a tape recorder and adjusting the tension of the metal plate part m while listening to the reproduced sound, even a non-expert can easily adjust and set the tension state. Can be done accurately.

[0018]

According to the method of manufacturing a thin metal plate according to the first aspect, the metal plate portion between the successive rolls of the forming roll group is hit to detect the vibration sound thereof, and the detected sound is used to detect the vibration sound. Since the tension of the metal plate portion is adjusted between the two, the overtension state of the metal plate portion, which is difficult to determine in appearance, can be easily determined, and the tension can be adjusted to the most suitable desired tension.

According to the second aspect, the vibration sound of each metal plate portion in the most preferable tension state between the successive rolls of the forming roll group is recorded on a recorder, and each vibration is recorded on the basis of the reproduced sound. By adjusting the tension of the metal plate portion, the adjustment and setting of the tension can be performed easily and accurately without skill.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sizing roll group.

FIG. 2 is an explanatory view showing a manufacturing process of a thin-walled pipe.

FIG. 3 is a front view showing one roll pair of a sizing roll group.

FIG. 4 is a front view showing another roll pair of the sizing roll group.

[Explanation of symbols]

 M Thin metal plate Mo Thin tube m Metal plate between rolls e Edge portion of thin metal plate or thin tube F Forming roll group 1a, 1b to 11a, 11b Roll 12 High frequency coil of welding means W Welded portion B1 Outside bead raised portion

 ───────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Yamaguchi 2-1-1, Edobori, Nishi-ku, Osaka Sumikin Steel Industry Co., Ltd. (72) Inventor Shinichi Hori 3-26-26 Showa Minami-dori, Amagasaki-shi, Hyogo Prefecture Amagasaki Matsumoto Building New Building 4F No. 401 Kantoku Metal Co., Ltd. (72) Inventor Hidenori Miura 4-53 Kitahama, Chuo-ku, Osaka Sumitomo Metal Industries Co., Ltd.

Claims (2)

[Claims] 1. A method of manufacturing a thin-walled tube in which a thin-walled metal plate is formed into a tubular shape by passing through a series of forming rolls, and both edges thereof are butt-welded. A method for manufacturing a thin metal pipe material, characterized by detecting a vibration sound by hitting a metal plate portion between the rolls, and adjusting the tension of the metal plate portion between the rolls by the detected sound. 2. A sound recording device that records a vibration sound when the metal plate between the rolls has a desired tension, and adjusts the tension of the metal plate between the rolls based on the reproduced sound. The method for producing a thin-walled tube according to claim 1.