JP2004027276A - Heating device in strain removing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating device in a strain removing apparatus with which over-heating or heating shortage with a heating coil and the development of trouble caused by the above happenings, are avoided by making adjustable of a position in the horizontal direction of the heating coil to a heating part corresponding to the thickness of a steel material and the shifting speed of the heating coil etc., and the removal in the target heating part can surely be obtained by effectively inputting the heat to the heating part with the heating coil. <P>SOLUTION: In the strain removing apparatus in the steel material, provided with the heating device for removing the strain in a deformed part by heating the neighborhood of the deformed part of the steel material with the heating coil set with a gap to the surface of the steel material, the heating coil is constituted of two bar-like parts composed of a pair of electric conducting bodies disposed with the prescribed gap and bent at a prescribed angle and a two-branched body integrally formed with a connecting part composed of the electric conducting body for combining the end parts of the bar-like parts. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is applied to the removal of strain generated in a hull weld or the like of a ship, and generates heat due to an induced current in a steel material by a heating coil which is installed with a predetermined gap from the surface of the steel material and is supplied with a high-frequency current. The present invention relates to a heating device of a distortion removing device for removing distortion by heating the vicinity of a deformed portion of a steel material.
[0002]
[Prior art]
In a hull of a ship or the like, mainly in a welded steel plate, a gas burner is used as a means for removing welding distortion, and the vicinity of the deformed portion is heated by a high-temperature gas such as argon gas from the gas burner to reduce the deformation of the steel material. Many means of correction are used.
However, in the means for heating the deformed portion and its vicinity by a high-temperature gas using such a gas burner, the work of removing the distortion itself is simple, but the gas heating is performed on the deformed portion such as a weld bead portion and its vicinity. However, it is difficult to adjust the heat input, and the strain is removed by adding an artificial element such as an operator's empirical element. Therefore, it is practically necessary to surely remove the strain so that the steel material has a target shape. Is impossible.
[0003]
As means for dealing with such a problem, a strain relief device applying high-frequency induction heating has been proposed.
FIG. 4 is an external side view showing a schematic configuration of a high-frequency induction heating strain removing device proposed in Japanese Patent Application Laid-Open No. 11-170081.
In the drawing, reference numeral 010 denotes a heating device having a configuration to be described later, which is mounted on a traveling carriage 011 which is made to travel on the steel plate 20 by a motor 017. 015 is a wheel of the traveling carriage 011.
In the heating device 010, reference numeral 012 denotes an amplification transformer for amplifying a current from a power supply (not shown).
Reference numeral 013 denotes a heating coil disposed on the surface of the steel plate 20 with a predetermined gap therebetween. The heating coil 13 is disposed on the ferrite core 018 in a horizontal direction (so that the lower surface of the coil 013 is parallel to the surface of the steel plate 20). ), And a high-frequency current amplified by the amplification transformer 012 is supplied.
[0004]
In such a high-frequency induction heating strain removing device, the traveling carriage 011 is caused to travel along the welding bead on the steel plate 20, and a current supplied from a power supply (not shown) is amplified by the amplification transformer 012 to a high-frequency current having a large current value. When the high-frequency current is applied to the heating coil 013, an induction current (eddy current) is generated in the steel sheet 20 adjacent to the heating coil 013, and a welding portion of the steel sheet 20 is generated by Joule heat accompanying the induction current. The vicinity is heated to remove the distortion of the portion.
[0005]
[Problems to be solved by the invention]
In a high-frequency induction heating strain removing device including a heating device that supplies a high-frequency current to a heating coil disposed at a predetermined gap from the surface of a steel sheet to generate heat by the induced current in the steel sheet, heating by the heating coil It is required to efficiently input heat to the site where the strain is generated, and to reliably remove the strain.
To this end, it is essential to control the current value of the high-frequency current to an appropriate value and adjust the gap between the heating coil and the surface of the steel sheet to an appropriate gap. , That is, the distance from the heating section of the steel sheet, to the horizontal direction, must be appropriately adjusted according to the thickness of the steel sheet and the traveling speed of the traveling vehicle.
[0006]
However, in the high-frequency induction heating strain removing device shown in FIG. 4, the heating coil 013 is wound around the ferrite core 018 so that the lower surface of the heating coil 013 is parallel to the surface of the steel plate 20. The winding center of the coil 013 is set in accordance with the thickness center of the vertical steel plate to be fillet-welded and is moved along the welding bead. The position in the horizontal direction with respect to the bead portion is determined centrally at the set position.
[0007]
Therefore, in such a conventional technique, the horizontal position of the heating coil 013 with respect to the heating portion of the steel plate 20, that is, the welding bead portion, is changed at any time according to the thickness of the steel plate and the traveling speed of the traveling vehicle, that is, the moving speed of the heating coil 013. It is impossible to adjust the position to the optimum position, and therefore, the heating coil 013 is burned out due to excessive heating, or the target weld is not distorted due to insufficient heating.
And the like.
[0008]
The present invention has been made in view of the problems of the related art, and makes it possible to adjust the horizontal position of the heating coil with respect to the heating unit in accordance with the thickness of the steel material, the moving speed of the heating coil, and the like. It is an object of the present invention to provide a heating device of a distortion removing device capable of avoiding the occurrence of a trouble associated with the above, and efficiently inputting heat to the heating unit by the heating coil and reliably removing a distortion of a target heating unit.
[0009]
[Means for Solving the Problems]
In order to solve this problem, the present invention, as an invention according to claim 1, amplifies a high-frequency current from a power supply by an amplifying transformer and energizes a heating coil disposed at a predetermined gap from the surface of the steel material. A heating device of a distortion removing device configured to generate heat due to an induced current in the steel material to heat the vicinity of a deformed portion of the steel material to thereby remove the strain in the deformed portion and the vicinity thereof; Is composed of two rod-shaped portions made of a conductor bent at a predetermined angle and arranged in pairs at a predetermined interval, and a connecting portion made of a conductor connecting ends of the rod-shaped portions. A heating device for a distortion removing device, comprising a bifurcated body integrally formed, is proposed.
[0010]
According to the second aspect of the present invention, a high-frequency current from a power supply is amplified by an amplification transformer, a current is applied to a heating coil disposed with a predetermined gap from the surface of the steel material, and heat is generated in the steel material by an induced current. In the heating device of the distortion removing device configured to remove the distortion in the vicinity of the deformed portion by heating the vicinity of the deformed portion of the steel material, the heating coil is disposed at a predetermined interval. Two rod-shaped portions made of conductors arranged in pairs, a connection portion made of an insulator connecting the ends of the rod-shaped portions, and the two rod-shaped portions wound around the connection portion It is characterized in that it is constituted by a bifurcated body in combination with a coil to be electrically connected.
[0011]
According to this invention, the heating coil is formed of a conductor and the two bar-shaped portions forming a pair are arranged at a predetermined interval, and the end of the bar-shaped portion is formed of the conductor. 3. A bifurcated body integrally formed by connecting with a connecting part, or a bifurcated body connected by a connecting part made of an insulator having a coil wound around its outer periphery as in claim 2. Since the current is supplied from the rod on one side to the rod on the other side via the connecting part, a plurality of types of heating coils are provided in which the length of the connecting part is changed so that the interval between the rods is different. In the case of steel plate welding, the thickness of the steel plate at the welded portion (heating portion) or the moving speed of the heating coil, that is, the running speed of the traveling carriage, can be easily prepared. The horizontal position between the weld and the heating coil Used to elect so that heating coil, it is possible to perform the heating of the weld and the vicinity thereof.
[0012]
Therefore, according to this invention, the horizontal position of the heating coil relative to the steel material heating portion is not determined in a unified manner as in the prior art, and the horizontal position of the heating coil is changed by the thickness of the steel material and the movement of the heating coil. It can be adjusted freely according to the speed and the like.
As a result, it is possible to avoid excessive heating or insufficient heating by the heating coil due to the improper horizontal position of the heating coil with respect to the steel material heating section and the occurrence of problems due to these. It is possible to reliably remove the distortion of the target heating section.
[0013]
In the first and second aspects, it is preferable to configure as in the third and fourth aspects.
That is, in the third aspect, the heating coil is formed of a flexible electric conductor.
According to this structure, the two rod-shaped portions forming a pair and the connecting portion connecting the rod-shaped portions at the distal end portion are formed of a flexible conductor. Fine-tune the distance between the paired rods, that is, the width of the heating coil, to the required optimum width by deforming the flexible rods and connecting parts as necessary, such as by adapting to the thickness of the steel plate. It becomes possible.
[0014]
Further, in claim 4, the heating coil is formed of a hollow body having a cooling water passage formed therein.
With this configuration, a continuous cooling water passage having a large passage cross-sectional area can be formed inside the heating coil, and the heating coil can be uniformly and sufficiently cooled even if the heating coil becomes large.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail using embodiments shown in the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just
[0016]
FIG. 1A is a perspective view of an outer ring of a heating coil according to a first embodiment of the present invention, and FIG. 1B is a sectional view taken along the line Z-Z in FIG. FIG. 2 is an outer ring perspective view of a heating coil according to a second embodiment of the present invention. FIG. 3 is a side view showing the configuration of a high-frequency induction heating and strain removing apparatus for steel provided with the heating apparatus according to the present invention.
[0017]
FIG. 3 shows a high-frequency induction heating and strain-removing device for a steel material provided with a heating device according to the present invention. In FIG. 3, reference numeral 20 denotes a steel plate to which welding has been applied, and 11 allows the steel plate 20 to travel along the welding bead. It is a traveling cart.
Reference numeral 16 denotes a bogie main body constituting an outer shell of the traveling bogie 11, and a power supply 17 is mounted inside. Reference numeral 15 denotes four wheels rotatably mounted on the front and rear lower portions of the bogie main body 16. The wheels 15 are configured by a magnet mechanism that rolls while constantly contacting the surface of the steel plate 20 by magnetic force and causes the traveling carriage 11 to travel.
[0018]
Reference numeral 1 denotes an internal support member provided inside the carriage main body 16 so as to be vertically movable independently of the carriage main body 16. The internal support member 1 has a substantially gate-shaped side surface formed by joining a vertical member 3a extending vertically downward from the front and rear ends of a horizontal member 3 provided horizontally at an upper portion, and a lower portion of the front and rear vertical members 7 , A guide roller 4 that can roll on the surface of the steel plate 20 is rotatably mounted.
Reference numeral 2 denotes a spring made of a disc spring or a coil spring interposed between the upper inner surface of the bogie main body 16 and the upper surface of the horizontal member 3 of the internal support member 1. 2 is pressed against the internal support member 1 side. The height of the internal support member 1 is maintained at a constant value H by the pressing action of the spring 2.
The front and rear ends of the internal support member 1 are in contact with the front and rear inner surfaces of the bogie main body 16 at the thrust surface 14, and the internal support member 1 follows the front and rear movement of the bogie main body 16 due to the rotation of the wheels 15. The surface of the steel plate 20 can be moved back and forth through the guide roller 4.
[0019]
An amplifying transformer 12 for amplifying a current supplied from the power supply 17 via the conducting wire 6 is fixed to a lower portion of the horizontal member 3 of the inner support member 1, and an amplifying transformer 12 is provided below the amplifying transformer 12. A heating coil 13 to which the amplified large current is passed through the conducting wire 6 is fixed via the coil supporting member 5.
Further, a gap C is formed between the lower surface of the heating coil 13 and the surface of the steel plate 20 for applying a high-frequency current to the heating coil 13 to generate heat in the steel plate 20 due to the induced current. I have.
[0020]
The present invention relates to an improvement of the heating coil 13 constituting the heating device 10 in the steel material high-frequency induction heating strain removing device shown in FIG.
1A and 1B showing a first embodiment of the heating coil 13, the heating coil 13 has two rod-shaped portions 13f, 13f arranged in pairs at a predetermined interval B. The connecting portion 13e that joins the ends of the rod-shaped portion 13f forms an integral forked body, and is made of a soft and somewhat flexible conductor such as a copper material.
[0021]
The heating coil 13 formed of a bifurcated body is bent upward at a predetermined angle (preferably 90 °) at an appropriate position in the longitudinal direction, and as shown in FIG. , And the upper surface near the connection portion 13e is fixed to the coil support member 5.
The heating coil 13 is formed as a hollow body in which a cooling water passage 13a is formed by communicating the insides of the rods 13f, 13f and the inside of the connecting portion 13e.
[0022]
In the heating coil 13, as shown in FIG. 1B, the interval B between the rod portions 13 f, 13 f takes into consideration the gap C between the lower surface of the heating coil 13 and the surface of the steel plate 20, and The horizontal position of the heating coil 13 with respect to the welded portion 20c is set so as to be an optimal position where excessive heating or insufficient heating does not occur in accordance with the thickness t of the vertical steel plate 20 to be fillet welded.
Specifically, several types of heating coils 13 having different intervals B are prepared near the optimal position, and the intervals B are optimal according to the thickness t of the steel plate 20 or the moving speed of the heating coils. Is selected and incorporated.
[0023]
At the time of welding distortion removal by the high-frequency induction heating distortion removing device having such a configuration, the current supplied from the power supply 17 is supplied to the amplification transformer 12 through the conducting wire 6, and the high-frequency high-frequency The current is amplified by the current and is supplied to the heating coil 13 through the conducting wire 6. An induction current (eddy current) is generated in the steel plate 20 adjacent to the heating coil 13 with a gap C by the high-frequency current flowing through the heating coil 13, and the steel plate 20 is welded by Joule heat caused by the induction current. The vicinity of the part is heated to remove the distortion of the part.
[0024]
According to this embodiment, the heating coil 13 is arranged with rod-shaped portions 13f, 13f formed of a pair of two conductors at a predetermined interval B, and ends of the rod-shaped portions 13f, 13f. Since it is composed of a forked body integrally formed by being connected by a connecting portion 13e made of an electric conductor, current is supplied from the rod 13f on one side to the rod 13f on the other side via the connecting portion 13e through the connecting portion 13e. As described above, it is possible to easily manufacture a plurality of types of heating coils 13 in which the distance B between the rod-shaped portions 13f is changed by changing the length of the connecting portion 13e. 13, the horizontal position of the welding portion 20c and the heating coil 13 in accordance with the thickness t of the welding portion 20c of the steel plate 20 or the moving speed of the heating coil 13, that is, the traveling speed of the traveling vehicle 11. Becomes optimal Used to elect the UNA heating coils 13, it can be heated in the welding portion 20c and the vicinity thereof.
[0025]
Further, since the heating coil 13 is made of a soft and somewhat flexible conductor such as a copper material, the heating coil 13 can be made as necessary according to the thickness t of the steel plate 20 at the welded portion 20c of the steel plate 20. By deforming the flexible rod 13f and the connecting part 13e, the distance B between the pair of rods 13f, that is, the width of the heating coil 13 can be finely adjusted to a required optimum width.
[0026]
Further, since the heating coil 13 is formed as a hollow body in which a cooling water passage 13a is formed by communicating the inside of the rod portions 13f, 13f and the inside of the connecting portion 13e, the heating coil 13 A continuous cooling water passage having a large passage cross-sectional area can be formed, and even if the heating coil 13 becomes large, the heating coil 13 can be uniformly and sufficiently cooled.
[0027]
Next, in a second embodiment of the heating coil 13 shown in FIG. 2, the heating coil is constituted by two rod-shaped portions 13b, 13b formed of a copper tube which is a flexible electric conductor. The ends of 13b, 13b are joined by a connecting portion 13c made of an insulator to form a forked body. Reference numeral 13d denotes a coil wound around the outer periphery of the connection portion 13c to electrically connect the two rod portions 13b.
Although not shown, the rod-shaped portions 13b, 13b are bent upward at a predetermined angle (preferably 90 °) at an appropriate position in the longitudinal direction, as in the first embodiment, as shown in FIG. The upper end side is fixed to the vertical member 7 of the internal support member 1, and the upper surface near the connection portion 13 c is fixed to the coil support member 5.
[0028]
According to this embodiment, in addition to the same operation and effect as the first embodiment, the rod-shaped portions 13b, 13b, and the bar-shaped pair formed only by changing the length of the connection portion 13c separately from the first embodiment are provided. The interval B between the portions 13b, that is, the width of the heating coil 13 can be changed, and if a plurality of connecting portions 13c having different lengths are prepared,
The heating coil 13 having the optimum interval B can be easily changed according to the thickness t of the steel plate of the welded portion 20c of the steel plate 20 or the moving speed of the heating coil 13.
[0029]
【The invention's effect】
As described above, according to the present invention, the heating coil is formed of a bifurcated body by connecting the ends of two rod-shaped portions made of an electric conductor and arranged at a predetermined interval by connecting portions. Since the current is supplied from the rod on one side to the rod on the other side via the connecting part, a plurality of types of heating coils are provided in which the length of the connecting part is changed so that the interval between the rods is different. It is possible to easily manufacture, and prepare such a plurality of types of heating coils, in the case of steel plate welding, according to the thickness of the steel plate of the welded portion or the traveling speed of the heating coil, that is, the traveling speed of the traveling vehicle, The heating coil and the vicinity thereof can be heated by selecting and using a heating coil that optimizes the horizontal position between the welding portion and the heating coil.
[0030]
Therefore, it is possible to freely adjust the horizontal position of the heating coil in accordance with the thickness of the steel material, the moving speed of the heating coil, and the like, whereby the horizontal position of the heating coil with respect to the steel material heating portion is inappropriate. Accordingly, it is possible to avoid excessive heating and insufficient heating by the heating coil and the occurrence of problems due to these, and it is possible to efficiently input heat to the heating unit by the heating coil and reliably remove distortion of the target heating unit.
[0031]
According to the third aspect of the present invention, the two rod-shaped portions forming a pair and the connecting portion connecting the rod-shaped portions at the distal end portions are formed of a flexible electric conductor. If necessary, deform the flexible rods and connecting parts to match the thickness of the steel plate in the welded area, so that the distance between the paired rods, that is, the width of the heating coil, is the required optimum. Fine adjustment to the width becomes possible.
[0032]
Further, according to the present invention, a continuous cooling water passage having a large passage cross-sectional area can be formed inside the heating coil, so that the heating coil can be uniformly and sufficiently cooled even if the heating coil becomes large. it can.
[Brief description of the drawings]
FIG. 1A is an outer ring perspective view of a heating coil according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along the line ZZ in FIG.
FIG. 2 is an outer ring perspective view of a heating coil according to a second embodiment of the present invention.
FIG. 3 is a side view showing the configuration of a high-frequency induction heating and strain-removing device for steel provided with the heating device according to the present invention.
FIG. 4 is an external side view showing a schematic configuration of a high-frequency induction heating strain removing device according to a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Internal support member 2 Spring 3 Horizontal member 4 Guide roller 7 Vertical member 11 Traveling trolley 12 Amplifying transformer 13 Heating coil 13a Cooling water passage 13b, 13f Rod-shaped part 13c, 13e Connection part 13d Coil 15 Wheel 16 Truck body 17 Power supply 20, 20a , 20b Steel plate 20c Weld B spacing

Claims (4)

A high-frequency current from a power supply is amplified by an amplification transformer, a current is applied to a heating coil arranged with a predetermined gap from the surface of the steel material, and heat is generated in the steel material by an induced current to cause a vicinity of a deformed portion of the steel material. In the heating device of the strain removing device configured to remove the deformed portion and the strain in the vicinity thereof by heating the heating coils, the heating coils are arranged in pairs at a predetermined interval and are arranged at a predetermined angle. Characterized in that it is constituted by a forked body integrally formed of two rod-shaped portions made of a conductor bent in a bent manner, and a connection portion made of a conductor joining the ends of the rod-shaped portions. Heating device of the strain removing device. A high-frequency current from a power supply is amplified by an amplification transformer, a current is applied to a heating coil arranged with a predetermined gap from the surface of the steel material, and heat is generated in the steel material by an induced current to cause a vicinity of a deformed portion of the steel material. In the heating device of the strain removing device configured to remove the deformed portion and the strain in the vicinity thereof by heating the heating coil, the heating coil is formed by a pair of conductors arranged at predetermined intervals. A combination of two rod-shaped parts, a connecting part made of an insulator connecting the ends of the rod-shaped part, and a coil wound around the connecting part and electrically connecting the two rod-shaped parts. A heating device for a strain removing device, comprising a bifurcated body. The heating device according to claim 1, wherein the heating coil is formed of a flexible conductor. The heating device according to claim 1, wherein the heating coil is formed of a hollow body having a cooling water passage formed therein.

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