JP4435998B2 - Metal pipe manufacturing equipment - Google Patents

Description

【００１４】
【発明の効果】
以上詳述したように、本発明はレーザー溶接等の溶接法を用いた場合の板端の目違いによる金属管の溶接部減肉を防止し、溶接部加工性を向上させた薄肉管を提供するものとして、工業上有益な効果をもたらし得るものである。
【図面の簡単な説明】
【図１】本発明例の装置の外観図。
【図２】本発明の実施例を示す製造装置の平面図。
【図３】本発明の実施例を示す製造装置の立面図。
【図４】本発明の実施例を示す製造装置の側面図。
【図５】従来の溶接金属管に見られる目違いを示す断面図。
【符号の説明】
１ 金属管
２ 孔型ロール
３ 凹み孔型ロール（溶接押さえ上ロール）
４ 凸孔型ロール（溶接押さえ下ロール）
５ 孔型ロール（駆動）
６ 溶接手段
７ 押さえ下ロール位置決め冶具
８ 押さえ上ロール位置決め冶具
９ 挿入ロール
１０ 駆動用モータ
１１ ガイド
１２ ガイド
１３ アーム[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal pipe manufacturing apparatus that prevents welding shapes such as misunderstandings when welding thin-walled materials such as laser welding, improves weldability, and enables high-speed stable welding. .
[0002]
[Prior art]
A conventional metal tube manufacturing apparatus uses a multi-stage perforated roll to form a bending moment in a circumferential direction from a plate-like coil. At the time of welding after forming, there is a forming stand for stably forming and welding welding called a squeeze (SQ) roll.
[0003]
Conventionally, this SQ roll is welded by using two-stage hole rolls facing left and right in multiple stages and with a reduced diameter. However, since there is no plate restraint, both ends of the plate 1 are abutted as shown in FIG. There was a problem in the dimensions and workability of the welded part that was misguided a when the plate edge was stepped during welding, and the pipe making speed was also limited.
[0004]
[Problems to be solved by the invention]
According to the method and apparatus for manufacturing a thin-walled tube disclosed in Japanese Patent Application Laid-Open No. 10-225717, a pair of SQ rolls disposed on the left and right sides of the metal tube and a backup that supports the inner surfaces of both edge portions of the metal tube There is something to arrange the means.
In this device, the backup roll is located behind the welding means and at the same position as the SQ roll (because it is behind the plate material and the plate ends abutted), so that the welded portion melts and solidifies, and the deformation resistance of the welded portion Since the correction is performed in a high state, it is substantially difficult to correct when a mistake occurs due to welding.
[0005]
The present invention provides a metal pipe manufacturing apparatus that prevents welding shapes such as misunderstandings when welding thin-walled materials such as laser welding, improves weldability, and enables high-speed stable welding. It is intended to supply.
[0006]
[Means for Solving the Problems]
That is, the gist of the present invention is that
In an apparatus for manufacturing a metal pipe by laser welding, a flat plate is formed into a cylindrical shape, two stages of hole rolls arranged on the left and right are arranged in the pipe forming direction, and laser welding means is provided between the front and rear hole rolls. In contact with the ends of both cylindrical plates before the welding point at a position (D is the diameter of the metal tube to be formed) at a distance of 0.1 Dmm to 1.5 Dmm away from the laser welding means on the upstream side of the laser welding means. Thus, the metal tube manufacturing apparatus has a convex hole roll disposed on the inner surface side of the cylindrical plate end portions and a concave hole roll disposed on the outer surface side.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail.
FIG. 1 shows an embodiment of the present invention.
In the metal tube manufacturing apparatus shown in FIG. 1, the metal tube base plate 1 before welding is constrained by the perforated rolls (SQ rolls) 2 arranged on the left and right with the welded portion symmetrical, and then the plate ends collide. Prior to the welding means to be butt welded, it is pressed by a convex hole type roll (pressing lower roll) 4 arranged on the inner surface side of the cylindrical plate end and a concave hole type roll (pressing upper roll) 3 arranged on the outer surface side. After that, the welded portion is made symmetrical and restrained by the hole-type rolls 5 arranged on the left and right, and welding such as laser is performed between the hole-type rolls 2 and 2 and the hole-type rolls 5 and 5 by the welding means 6.
It should be noted that the thin roll material requires a pushing force when entering the left and right perforated rolls 2 and compressive stress acts on the plate edge portion at the open end. Therefore, the perforated roll 5 should be a drive roll. Is preferred.
[0008]
Moreover, the roll support of the convex hole type roll 4 and the concave hole type roll 3 was attached to the entrance side stand which supports the insertion roll 9 installed in front of the hole type roll 2 as shown, for example in FIG.2 and FIG.3. It is fixed by a presser lower roll positioning jig 7 and a presser upper roll positioning jig 8, and the convex hole type roll 4 and the concave hole type roll 3 are held before the welding means. It is preferable to have a mechanism that can change the position in the height direction according to the thickness and outer diameter. In FIG. 3, the mechanism can adjust the height by the guides 11 and 12.
Further, as shown in FIGS. 3 and 4, the convex hole type roll 4 is supported by one end side of an arm 13 installed in the axial direction in the metal tube. A motor 10 that drives the hole-type roll 5 is disposed below the hole-type roll 5.
[0009]
The distance between the convex hole type roll 4 and the concave hole type roll 3 and the welding means 6 is preferably as small as possible. When the diameter of the steel pipe to be formed is D, the distance is preferably 0.1 Dmm to 1.5 Dmm. This is because if the distance is less than 0.1 Dmm, the roll is easily damaged by welding, whereas if it is greater than 1.5 Dmm, the roll restraining effect is reduced.
[0010]
The present inventor has made various studies and constrains the welded portion from the inside and outside of the plate in the vicinity before the plate ends collide with each other. It was possible to eliminate the local thickness reduction due to the level difference.
According to the present invention, in the conventional method having a pressing roll after welding, there is a deterioration due to heating of the roll, and it is necessary to form a groove on the roll to avoid contact with the weld bead. In addition, the entire surface can be contacted, and a stable forming plate can be obtained. The present invention can also be applied to welding of a thin-walled material after being formed by press molding or a three-roll bender.
[0011]
【Example】
Table 1 shows the relationship between the thickness of the welded portion and the occurrence of a step when welding is performed using the comparative example and the present invention. A steel plate having a tensile strength of 500 MPa was used as a material for the metal tube, and form welding was performed in the range of an outer diameter of 60.5 mm and a plate thickness (t) of 0.6 to 1.6 mm.
In the comparative example, the test was performed with two types, one in which a laser welding head was provided between two stages of perforated rolls arranged on the left and right, and one in which only a metal tube pressing roll was arranged immediately below.
[0012]
In the example of the present invention, the distance (L) between the hole roll 5 and the presser upper roll (dent hole roll) 3 and the presser lower roll (convex hole roll) 4 is 40 mm (that is, the front of the laser welding processing head). A presser upper roll and a presser lower roll were installed at 30 mm). In the comparative example, a step larger than 100 μm occurred, but in the example of the present invention, welding with reduced thickness of 50 μm or less became possible. In addition, almost no appearance flaws occurred due to the presser roll and presser roll.
[0013]
[Table 1]

[0014]
【The invention's effect】
As described above in detail, the present invention provides a thin-walled tube that prevents weld metal thinning due to misalignment of the plate edge when using a welding method such as laser welding and improves weldability. As such, it can have industrially beneficial effects.
[Brief description of the drawings]
FIG. 1 is an external view of an apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view of a manufacturing apparatus showing an embodiment of the present invention.
FIG. 3 is an elevation view of a manufacturing apparatus showing an embodiment of the present invention.
FIG. 4 is a side view of a manufacturing apparatus showing an embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a difference between conventional welded metal pipes.
[Explanation of symbols]
1 Metal tube 2 Hole type roll 3 Recessed hole type roll (Welding presser upper roll)
4 Convex hole type roll (roller under welding press)
5 Hole roll (drive)
6 Welding means 7 Presser lower roll positioning jig 8 Presser upper roll positioning jig 9 Insert roll 10 Driving motor 11 Guide 12 Guide 13 Arm

Claims (1)

In an apparatus for manufacturing a metal pipe by laser welding, a flat plate is formed into a cylindrical shape, two stages of hole rolls arranged on the left and right are arranged in the pipe forming direction, and laser welding means is provided between the front and rear hole rolls. In contact with the ends of both cylindrical plates before the welding point at a position (D is the diameter of the metal tube to be formed) at a distance of 0.1 Dmm to 1.5 Dmm away from the laser welding means on the upstream side of the laser welding means. Thus, the manufacturing apparatus of the metal tube characterized by having the convex hole type | mold roll arrange | positioned at the inner surface side of the said cylindrical both board edge part, and the concave hole type roll arrange | positioned at the outer surface side.

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