JP2001225184A - High-speed correction device for welding distortion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-speed correction device for welding distortion with which a high-speed correction is definitely carried out by appropriately broadening the width of a thermal source which moves along a welding zone when a welding distortion is corrected. SOLUTION: The device is constructed in a way that a heating coil 0 is movable along a welding zone on the front side of a structural member 10 so that the welding distortion of the structural member 10 serving as a surface material welded on its back to a rib member 11 is corrected, and the coil is composed of plural channel-shaped ferrite cores 3, a coil conductor 2 inserted through the opening of the ferrite core 3, and metallic cooling members 4 and 5 which hold and cool the cores 3 and the conductor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting a distortion of a weld of an aluminum member such as a hull, a bridge or the like, or an aluminum member such as a vehicle at a high speed.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, when a skin material a and an aggregate b made of a metal material such as an iron structural member or an aluminum member are fillet-welded at a welded portion c, shrinkage at the welded portion c causes It is well known that the skin material a is deformed in the shape of the letter "H" as shown in the figure. Conventionally, in order to correct such welding distortion, linear heating is performed on a portion of the skin material a facing away from the aggregate b exclusively by a gas flame, and the contraction force of cooling after the heating is reduced. Utilization was used to correct welding distortion.

[0003] Furthermore, the linear heating method using a gas flame requires a skilled person, which leads to deterioration of the environment and has drawbacks such as low reproducibility. This is proposed in Japanese Patent Application Laid-Open No. 58-221692 (Reference 1) and Japanese Patent Application Laid-Open No. 59-33095 (Reference 2). The methods of Patent Documents 1 and 2 both use high-frequency induction heating, and are highly effective and highly reproducible and capable of automating a weld distortion.

However, any of the techniques of the above-mentioned references 1 and 2 is based on the premise that the linear heating by the gas flame is replaced by the linear heating by the induction heating, so that the range of the heating section is as narrow as possible and equivalent to the gas flame method. It is assumed that heating is performed at the moving speed. In the gas flame heating means and the high frequency linear heating means of the above-mentioned references 1 and 2, the moving speed is 300 m.
m / min to 500 mm / min.

In order to improve productivity in automation, which is an advantage of high-frequency heating, it is essential to increase the moving speed. However, the moving speed of the heating source is, for example, 2000 mm.
When the speed is increased to about / min, welding distortion cannot be corrected by the above-mentioned conventional heating method.

Normally, the surface temperature of a steel plate in strain repair for both gas flame heating and high-frequency linear heating is about 900 ° C. at the maximum. It is known that in the repair of weld distortion by the heating / cooling process, the material is deteriorated particularly in terms of tensile strength and fracture toughness.
The temperature is controlled to 00 ° C. or lower, and it is considered that the lower the temperature is, the better.

[0007] Since both gas flame heating and high-frequency heating are heat input at the outermost surface of the steel sheet, the moving speed is 300 mm / min to 500 mm / mi even if the heating source is a linear heat source as in the prior art.
If the speed is as low as about n, the temperature rise region is widened by heat conduction in the thickness direction and the width direction of the steel sheet, and the distortion has been corrected by bending plastic deformation due to the temperature difference of the steel sheet during cooling after heating.

However, with a conventional linear heating source, 2000 mm
When performing high-speed moving heating at about / min, even if the surface temperature of the steel sheet is increased, heat conduction in the sheet thickness direction and the sheet width direction after movement of the heat source is small, and only the linear surface immediately below the heat source has a high temperature.
The bending moment in the low temperature range accompanying the cooling and shrinkage of this part is small, and almost no distortion can be corrected.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a high-speed welding distortion correction system in which the width of a heat source moving along a weld is appropriately widened to correct welding distortion. It is an object to provide a device.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a high-speed welding distortion correcting apparatus according to the present invention is provided on a front side of a metal structural member whose back side is welded, along a welded portion thereof and slightly from the structural member. A plurality of U-shaped ferrite cores provided with a high-frequency heating coil capable of traveling in a separated state, the heating coil being arranged in the width direction perpendicular to the traveling direction with the opening facing the structural member, It is characterized by comprising a coil conductor inserted into the opening of the ferrite core, and a metal cooling member for holding the ferrite core and the coil conductor.

Further, in the welding distortion high-speed correcting apparatus according to the present invention, the lateral width perpendicular to the advancing direction of the heating coil is 90-11.
It is characterized by being set to 0 mm.

Further, the welding distortion high-speed correcting apparatus according to the present invention is characterized in that a plurality of rows of a plurality of ferrite cores juxtaposed in a direction perpendicular to the traveling direction are provided adjacent to each other. .

In the welding distortion high-speed correcting apparatus according to the present invention, the metal cooling member is configured as a copper cooling member having water cooling holes.

In the above-described high-speed welding distortion correcting apparatus of the present invention,
A plurality of U-shaped ferrite cores in which high-frequency heating coils that can travel along the weld of metal structural members and are slightly separated from the structural members are arranged side by side in the width direction perpendicular to the direction of travel, and the same ferrite core With the coil conductor inserted through the opening, the welding distortion can be accurately corrected even at high speed while heating progresses while having an effective heating area with a sufficient width, and the above ferrite core and coil The function of preventing overheating is sufficiently maintained by the metal cooling member that holds the conductor.

[0015] If the transverse width perpendicular to the traveling direction of the heating coil is set to 90 to 110 mm, a sufficient bending moment can be given to the object, for example, a steel skin material having a thickness of about 16 mm. Correction of welding distortion when fillet welding at right angles of steel aggregate of similar thickness on the back side of
It has been confirmed that even if the traveling speed of the heating coil is increased to about 2000 mm / min, the heating coil is properly operated.

Further, when a plurality of rows of a plurality of ferrite cores arranged side by side in the width direction perpendicular to the traveling direction are provided adjacent to each other, the width perpendicular to the heating traveling direction is about 100 mm. The surface temperature of a steel plate having a thickness of about 16 mm is suppressed to about 750 ° C., which is lower than that of the conventional steel sheet, so that welding distortion can be sufficiently corrected.

As the metal cooling member for holding the ferrite core and the coil conductor, a member provided with a heat radiating fin may be used. High cooling and holding functions can be ensured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 (a) to 1 (d) show a welding distortion high-speed correcting apparatus as a first embodiment of the present invention. 1 (a) is a cross-sectional view thereof, and FIG.
1 (a) is a cross-sectional view taken along the line BB, FIG. 1 (c) is a view taken along the line CC of FIG. 1 (a), and FIG. 1 (d) is a view taken along the line DD of FIG. 1 (a). 2 (a) to 2 (c) show a welding distortion high-speed correcting apparatus as a second embodiment of the present invention. FIG. 2 (a) is a cross-sectional view thereof, and FIG. 2 (b) is FIG. 2A is a cross-sectional view taken along a line BB, and FIG. 2C is a view taken along a line CC in FIG.
FIGS. 3A to 3D are explanatory diagrams showing a heating deformation model.

First, a description will be given of a welding distortion high-speed correcting apparatus according to a first embodiment of the present invention. FIGS. 1 (a) to 1 (d)
As shown in the figure, when the steel structural member 10 as the skin material was welded to the back side of the steel structural member 11 as the aggregate by the fillet welding 12, the steel structural member 10 was generated in the structural member 10 as the skin material. In order to correct welding distortion (see FIG. 4), a high-frequency heating coil 0 which can travel along the welded portion and is slightly separated from the structural member 10 on the front side of the structural member 10 is attached to a traveling means (not shown). It is provided in such a manner as to be performed.

The heating coil 0 has two rows of a plurality of U-shaped ferrite cores 3 arranged side by side in the width direction perpendicular to the traveling direction so that the opening faces the structural member 10. 3 is provided with one or more turns of the coil conductor 2 inserted and wound in the opening of the ferrite core 3 and the coil conductor 2.
The cooling member made of copper is tightly connected to the cooling copper plate 4 sandwiching the ferrite core 3 and the cooling copper plate 4 via copper plate fixing bolts 7. And a water-cooled copper plate 5. Water-cooled holes 6 are formed in the water-cooled copper plate 5, and cooling water flows through the water-cooled holes 6.

A high-frequency current is supplied to the coil conductor 2 from a high-frequency power supply circuit (not shown) via the coil lead portion 1. The coil conductor 2 is usually formed of a hollow copper tube, and cooling water is supplied into the coil conductor 2 from a cooling water circuit (not shown).

The ferrite core 3 is provided for the purpose of generating magnetic flux due to the coil conductor current with high efficiency and acting on the member to be heated. The cooling copper plate 4 arranged so as to sandwich the ferrite core 3 is in close contact with the water-cooled copper plate 5 cooled by the cooling water flowing through the water cooling holes 6 with the copper plate fixing bolts 7 to cool the ferrite core 3.

The ferrite cores 3 arranged in two rows have
As shown in FIG. 1B, high-frequency magnetic flux efficiently generated by the coil conductor current passes, and this magnetic flux links the structural member to be heated. The action takes place.

In FIG. 1, the effective heating width in a direction perpendicular to the direction of movement of the heating device is the area where the ferrite 3 is arranged.
The width is set to 90 to 110 mm, preferably about 100 mm, so that a wide range of heating can be performed. On the other hand, in the heating device traveling direction F, as the coil conductor 2 is energized, the structural member 10 is heated at the portions of the two rows of lines where the eddy currents d and e flow intensively in the structural member 10. .

From the above, the structural member 10 whose distortion is to be corrected
Is heated widely by two heating lines having a width of about 100 mm, which are perpendicular to the traveling direction F of the heating device. In addition, in FIG. 1B, the symbol f indicates a high-frequency magnetic flux,
i and j indicate circulating currents.

FIG. 3 shows a thermal deformation model of a member by surface heating (literature: “Study on steel sheet bending by linear heating”, Mitsubishi Heavy Industries Technical Report Vol. 12, No. 3, 1975). In FIG. 3, FIG. 3A shows a state before heating, FIG. 3B shows a state of reaching a maximum temperature point during heating, FIG. 3C shows a state after heating,
(D) The figure shows the final bent shape. The bending angle φ generated in the final bending state is expressed by the following [Equation 1].

(Equation 1)

As can be seen from the equation (1), 2000
When heating is performed at a high speed of about mm / min, heat cannot penetrate in the width direction and the plate thickness direction, and the heating width W directly affects the bending angle φ, that is, the distortion correction amount.

As shown in FIG. 1, by performing a wide heating of about 100 mm with a compact high heat flux coil using a ferrite core, about 2000 mm / min, which was impossible with conventional linear heating. High-speed distortion correction became possible. In the experiment, a steel member obtained by welding a 16 mm thick aggregate to a 16 mm thick skin in a T-shape was used.
Although there was a distortion amount of 4 mm per unit, at a frequency of 25 kHz and a steel material heating amount of approximately 60 kW, the heating coil shown in FIG.
The strain was completely eliminated by high-speed heating at 000 mm / min. The maximum temperature of the steel sheet surface at that time was about 750 ° C., which was lower than in the conventional case.

Next, a description will be given of a welding distortion high-speed correcting apparatus according to a second embodiment of the present invention.
As shown in FIG. 1, also in the present embodiment, a steel structural member 10 as a skin material has a steel structural member 11 as an aggregate on the back side.
In order to correct the welding distortion (see FIG. 4) generated in the structural member 10 as a skin material when the is welded by the fillet welding 12, the structural member is arranged along the welded portion on the front side of the structural member 10.
A high-frequency heating coil 0 that can travel in a state slightly separated from 10 is provided so as to be mounted on traveling means (not shown).

The heating coil 0 has only one row of a plurality of U-shaped ferrite cores 3 arranged side by side in the width direction perpendicular to the traveling direction with the opening directed toward the structural member 10. One-turn or multiple-turn coil conductor 2 inserted through the opening of core 3 and wound
And a copper cooling member 4 and 5 for holding the ferrite core 3 and the coil conductor 2. The copper cooling member comprises a cooling copper plate 4 for holding the ferrite core 3 and a cooling copper plate 4 and a water-cooled copper plate 5 which is tightly joined to the plate 4 via a copper plate fixing bolt 7. Water-cooled holes 6 are formed in the water-cooled copper plate 5, and cooling water flows through the water-cooled holes 6.

A high-frequency current is supplied to the coil conductor 2 from a high-frequency power supply circuit (not shown) via the coil lead portion 1. The coil conductor 2 is usually formed of a hollow copper tube, and cooling water is supplied into the coil conductor 2 from a cooling water circuit (not shown).

The ferrite core 3 is provided for the purpose of generating a magnetic flux due to the coil conductor current with high efficiency and acting on the member to be heated. The cooling copper plate 4 arranged so as to sandwich the ferrite core 3 is in close contact with the water-cooled copper plate 5 cooled by the cooling water flowing through the water cooling holes 6 by the copper plate fixing bolts 7 to cool the ferrite core 3.

The ferrite cores 3 arranged in one row include:
As shown in FIG. 2B, the high-frequency magnetic flux efficiently generated by the coil conductor current passes, and this magnetic flux links the heated structural member, so that an eddy current is induced in the structural member and the structural member is heated. You.

In the welding distortion high-speed correcting apparatus according to the second embodiment, the width of the heating coil 0 at right angles to the traveling direction of the heating coil 0 is desirably set to 90 to 110 mm, preferably 100 mm. The same operation and effect as the embodiment can be obtained.

Further, the same function and effect as in the first embodiment can be obtained also with respect to the highly reliable cooling function and holding function by the copper cooling members 4 and 5 having the water cooling holes 6 as the metal cooling members.

[0036]

As described in detail above, according to the welding distortion high-speed correcting apparatus of the present invention, the following effects can be obtained. (1) A plurality of U-shaped ferrite cores in which a high-frequency heating coil that can travel along the welded portion of the metal structural member and is slightly separated from the same structural member is arranged side by side in the width direction perpendicular to the traveling direction, With the coil conductor inserted into the opening of the ferrite core, welding distortion can be accurately corrected even at high speed while heating progresses with an effective heating area with a sufficient width. The function of preventing overheating is sufficiently maintained by the metal cooling member that holds the core and the coil conductor. (2) The width at right angles to the traveling direction of the heating coil is 90
When the thickness is set to about 110 mm, a sufficient bending moment can be given to the object, and for example, a steel aggregate having the same thickness is filleted perpendicularly to the back side of a steel skin having a thickness of about 16 mm. Even if the correction of welding distortion in the case of welding increases the traveling speed of the heating coil to about 2000 mm / min,
It has been confirmed that it is performed properly. (3) When a plurality of rows of a plurality of ferrite cores arranged side by side in the width direction perpendicular to the traveling direction are provided adjacent to each other, the width perpendicular to the heating traveling direction is 100 m.
The surface temperature of a steel plate having a thickness of about 16 mm is held down to about 750 ° C., which is lower than that of a conventional steel sheet, while the width is as wide as about m, so that sufficient welding distortion can be corrected. (4) As the metal cooling member holding the ferrite core and the coil conductor, a member provided with a radiation fin may be used.However, when this is configured as a copper cooling member having water cooling holes, reliability is improved. High cooling and holding functions can be ensured.

[Brief description of the drawings]

1A and 1B show a welding distortion high-speed correcting apparatus as a first embodiment of the present invention, wherein FIG. 1A is a cross-sectional view thereof, and FIG. 1B is a cross-sectional view of FIG. , (C) is a view taken in the direction of arrows CC in FIG. (A), and (d) is a view taken in the direction of arrows DD in FIG.

2A and 2B show a welding distortion high-speed correcting apparatus as a second embodiment of the present invention, wherein FIG. 2A is a cross-sectional view thereof, and FIG. 2B is a cross-sectional view of FIG. , (C) is a view taken in the direction of arrows CC in (a).

FIG. 3 is an explanatory diagram showing a thermal deformation model of a member due to surface heating.

FIG. 4 is an explanatory view showing a state in which a skin material is deformed at a welded portion between a skin material as a metal material and an aggregate.

[Explanation of symbols]

 0 Heating coil 1 Coil lead 2 Coil conductor 3 Ferrite core 4 Cooling copper plate 5 Water cooling copper plate 6 Water cooling hole 7 Copper plate fixing bolt 10 Steel structural member (skin material) 11 Steel structural member (aggregate) 12 Fillet welding F progress direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryoji Taura 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Inside the Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Kuniyuki Kajinishi 4-6-22 Kanon Shinmachi, Nishi-ku, Hiroshima City No. Mitsubishi Heavy Industries, Ltd. Hiroshima Laboratory (72) Inventor Takeshi Omura 4-22, Kannonshinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd. Hiroshima Plant F-term (reference) 4E081 DA12 EA37

Claims (4)

[Claims] 1. A high-frequency heating coil which can travel along a welded portion of the front surface of a metal structural member which is welded on the back side and is slightly separated from the structural member along the welded portion. A plurality of U-shaped ferrite cores arranged side by side in a width direction perpendicular to the traveling direction so as to face the structural member, a coil conductor inserted through an opening of the ferrite core, and the ferrite core and the coil conductor described above. A high-speed welding distortion correcting device, comprising: 2. The high-speed welding distortion correcting apparatus according to claim 1, wherein a width perpendicular to a traveling direction of the heating coil is set to 90 to 110 mm. . 3. The welding distortion high-speed correcting apparatus according to claim 1, wherein a plurality of rows of a plurality of ferrite cores arranged in a direction perpendicular to the traveling direction are provided adjacent to each other. A welding distortion high-speed correction device. 4. The welding distortion high-speed correcting apparatus according to claim 1, wherein the metal cooling member is configured as a copper cooling member having water cooling holes. High-speed welding distortion correction device.