JPH07214331A - Method for connecting metallic strip - Google Patents

Abstract

PURPOSE:To connect strips to each other only by the two stages without the need for carrying out cutting of protruding parts after lap welding by simultaneously executing cutting actions of both of cutting of the end faces of both strips and cutting of both sides of the ends, then superposing the ends on each other and welding these ends. CONSTITUTION:Working of both of working of the end faces 21, 22 of the strips 1a, 1b and working of both side faces 23, 24 is executed before the rear end of the strip la and the front end of the strip 1b are subjected to lap welding. The ends of the strips la, 1b cut in such a manner are superposed on each other and while these ends are pressurized, a lap seam weld zone is formed at the center of the superposed parts. The protruding parts are generated on both sides of the superposed parts by pressurizing. These protruding parts protrude only by approximately the same value as the working margins (a) of the notched parts on both sides of the respective strips 1a, 1b and, therefore, holes and projecting parts are not formed even if a pipe material is formed by the strips 1a, 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting metal strips, which is an improved method for overlapping and welding end portions of the strips in the longitudinal direction.

[0002]

2. Description of the Related Art A pipe material having a wall thickness of 0.5 mm or less is manufactured by the process shown in FIG. The strip 1a wound around the support shaft 10 is used as a plate joining means 2, a hoop cage 3,
It is formed into an electric resistance welded pipe through the welding means 4, the annealing means 5 and the adjusting means 6 and cut into the pipe 8 by the dividing means 7. The strip 1a and the strip 1b are wound around both ends of a support shaft 10 integrally attached to the vertical shaft 9, and the vertical shaft 9 is attached to
The feeding strip can be replaced by rotating it by 0 °. When the strip 1a disappears and the strip 1b is supplied after that, the plate joining means 2 superimposes the rear end of the strip 1a and the front end of the strip 1b on the strip 11 and above the overlapped portion. Roll the roller electrode to press the overlapped part,
It is to energize and perform lap seam welding. 1
Reference numerals 2 and 13 are rollers. The hoop cage 3 is formed between the rolls 14 and 15 so that the electric welding pipe welding for forming the pipe material by the welding means 4 located downstream of the hoop cage 3 while the strips are overlapped and welded can be continuously performed. The strip plate 1a is stocked by increasing the distance of 1 and the strip plate 1a is supplied by reducing the distance between the rolls 14 and 15. The welding means 4 is adapted to perform welding while applying a high-frequency current to both sides of the strip 1a, which are V seams that are sequentially butted against each other as the belt travels. The annealing means 5 is for induction heating while moving the pipe material welded by electric resistance welding. Arbitration means 6
Is for adjusting the dimension of the pipe material and correcting the bend, and 6a is a cooling means. 7a in the dividing means 7
Indicates a cutter.

By the way, plate joining in the plate joining means 2 is performed as shown in FIG. First, as shown in FIG. 4A, the end portions of the strips 1a and 1b are obliquely cut along cutting lines parallel to each other. This disconnection is done simultaneously. Next, both ends of the strips 1a and 1b are overlapped with each other to form a lap seam weld 16 at the center of the overlapped portions as shown in FIG. 4 (b). Then, during welding, the pressure generated by the roller electrode causes the protruding portion 17 as shown in FIG. 4C, so that the protruding portion 1 as shown in FIG.
Cut out 7.

[0004]

However, since there are three steps of cutting, welding and cutting when joining the strips, it takes time and the stock amount of the strips in the hoop cage must be increased. , Equipment becomes larger. Also, if the cutting of the strip is mechanized, the equipment becomes larger because there are three steps.

On the other hand, if the cutting after welding is carried out manually, a hole is formed in the welded pipe material when cutting is performed along the cutting line 18 in FIG. 5, and when cutting is performed along the cutting line 19. The welded pipe material has a protrusion.

Therefore, an object of the present invention is to provide a method for connecting metal strips which solves the above problems.

[0007]

[Means for Solving the Problems] The structure of the present invention for achieving the above object is a cutting operation in which end portions of strips to be connected to each other are opposed to each other and end faces thereof are substantially parallel to each other. After cutting both edges, the edges of the strips will stick out to both sides of the strip when they are energized and welded while being energized and welded. In addition, the above-mentioned welding action is performed.

[0008]

[Operation] Since both end portions of both strips and both sides of the end portion are cut at the same time, the end portions are overlapped and welded together, so that the strips are joined together in only two steps. Connection can be made.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

FIG. 1 shows a method of connecting metal strips according to the present invention.
~ It demonstrates based on FIG. In the present invention, the rear end of the strip 1a and the front end of the strip 1b are processed into the shape shown in FIG. 1 before the lap welding. That is, both the processing of the end surfaces 21 and 22 of the strips 1a and 1b and the processing of both side surfaces 23 and 24 are performed.

The end faces 21 and 22 are formed in a state of being inclined with respect to the length direction of the strip plates 1b and 1a, and the end faces 21 and 2 are formed.
It is almost parallel to 2. The side surfaces 23 and 24 are both processed such that the machining allowance a is a = 1 to 2.5t. Here, t is the thickness of the strips 1a and 1b. The size of the machining allowance "a" is determined in this manner because such a value does not cause a hole or conversely a protruding portion when the pipe material is formed into a pipe material.

In order to form the strips 1a and 1b in a single process so as to have a shape as shown in FIG. 1, a punch 25 having a substantially H-shape as shown in FIG. 2 is used. As shown by the chain double-dashed line in FIG.
When both strips 1a and 1b are cut at the same time, the shape shown by the solid line in FIG. 2 is obtained.

The strips 1a and 1b cut as described above
A lap seam weld is formed at the center of the overlapped portions while overlapping the end portions of each other while applying pressure as in the conventional case. By applying pressure, protruding parts are generated on both sides of the overlapped part, but since the protruding parts protrude only by a value substantially the same as the machining allowance a of the cutout parts on both sides of each strip plate, Even if the pipe material is molded, holes and protrusions do not occur.

When the strips are connected to each other by using such a method for connecting strips, conventionally, the strips are cut off at their ends, then the ends are overlapped and welded, and then the protruding portion is cut off. Although three steps were required, the cutting of the end portion and the cutting of the side portion to be the protruding portion are performed at the same time, and two steps are sufficient. Then, by mechanically cutting both the end portion and the side portion of the strip,
Not only can it be cut with a single press, but the quality is stable and the operating rate is improved.

[0015]

As can be seen from the above description, according to the method for connecting metal strips of the present invention, the action of cutting the end portions of the strips to be connected to each other and the action of cutting both sides of the end portions are performed. Since it is carried out before the lap welding, the work of cutting off the protruding portion which is conventionally carried out after the lap welding is not required, and the number of working steps can be reduced. Further, since the shape of the cut portion is stable, the welding quality is stable. Furthermore, if the cutting action on both ends and both sides of the strip is machined at the same time,
This is advantageous in terms of machine installation space for cutting and machine cost.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for connecting metal strips according to the present invention.

FIG. 2 is an explanatory view showing a punch for carrying out the method for connecting metal strips according to the present invention.

FIG. 3 is a configuration diagram of an apparatus for manufacturing a pipe material.

FIG. 4 is an explanatory view showing a conventional method for connecting metal strips.

FIG. 5 is an explanatory view showing a problem of a conventional method for connecting metal strips.

[Explanation of symbols]

 1a, 1b ... Strip plate 21, 22 ... End face 23, 24 ... Side surface

Claims (1)

[Claims] 1. A cutting method in which end portions of strips to be connected to each other are opposed to each other so that the end surfaces of the strips are substantially parallel to each other, and the end portions of the strips are overlapped with each other and pressure is applied to conduct welding. The metal strip is characterized in that the above-mentioned welding action is carried out after performing both cutting actions, that is, cutting both sides of the strip plate end portion that will protrude to both sides of the strip plate. How to connect the boards.