JPS641950Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a post-annealing device used for improving the structure of a welded portion of an ERW tube or removing residual stress in an ERW tube manufacturing line.

Electric resistance welded pipes are manufactured continuously by bending the opposite edges of a continuously fed steel strip so as to face each other to form a cylindrical shape, and by welding the edges to be brought together while heating and melting. The manufactured ERW pipe is cut into the inner and outer beads of the welded part, and then annealed or normalized by electromagnetic induction heating at a high frequency of 0.5 to 10 KHz using a post-annealing device to remove residual stress. and organizational improvements will be made.

Incidentally, as a post-annealing apparatus used for such heat treatment, apparatuses as shown in FIGS. 1, 2, and 3 have conventionally been used. Figure 1 is a partially cutaway perspective view showing an electromagnetic inductor, which is the main part of a conventional post-annealing device, Figure 2 is an enlarged cross-sectional view taken along the - line in Figure 1, and Figure 3 is the installation of the central conductor seen from below. It is a perspective view showing the state, in which 71f and 71r are front and rear conductors, 72f and 72r are terminal parts,
73 is a center conductor, 74l and 74r are left and right side conductors, 75 is an iron core, and 76 is a cooling plate.

The front and rear conductors 71f and 71r are hollow bodies and are placed opposite each other with a required interval between them, and a pair of gate-shaped terminal portions 72f and 72r are interposed between them, with an insulating plate 72a interposed between them, and bolts and The terminal portion 72f is disposed to face the front conductor 71f, and the terminal portion 72r is opposed to the rear conductor 71r, with the terminal portion 72f and the rear conductor 71r being integrally fixed together with nuts, and the front and rear conductors 71f, A rectangular cylindrical central conductor 73 with a rectangular cross section is located between the lower ends of the conductor 71r.
are installed under the terminal portions 72f and 72r, and between the front conductor 71f and the terminal portion 72f and between the rear conductor 71r and the terminal portion 72r are corners located on the left and right side respectively and having a rectangular cross section. Cylindrical left and right conductors 74l and 74r are installed. Both ends of the central conductor 73 and one end of each of the left and right conductors 74l and 74r are connected to the front and rear conductors 71f and 71r, respectively, so that their hollow portions communicate with each other, and each of the left and right conductors 74l and 74r is connected to the front and rear conductors 71f and 71r, respectively. The end portions are fixed to the terminal portions 72f and 72r with silver solder in an airtight manner. And the front and rear conductors 71f, 71r,
A plurality of iron cores 75 and cooling plates 76 are installed in the air space surrounded by the left and right conductors 74l, 74r and the center conductor 73, respectively.
is installed. The iron core 75 is made of a silicon steel plate, and the cooling plate 76 is made of copper, both of which have a substantially square shape when viewed from the front, with lower corners on both sides cut out and inverted U-shaped notches 75a and 76a formed in the center of the lower part. A pipe 76b for circulating cooling water is arranged and fixed on one side of the cooling plate 76 along the peripheral edge of the cooling plate 76 except for the upper edge thereof. The iron core 75 and the cooling water 76 are sequentially and alternately overlapped between the front and rear conductors 71f and 71r, and are placed in the cutout portions 75, respectively.
It is mounted on the central conductor 73 by straddling the center conductor 73 via the wires 76a and 76a. Pipe 7 of each cooling plate 76
6b is divided into front and rear portions of the terminal portions 72l and 72r, and connected in series across each cooling plate 76 using a connecting pipe 76c, so that cooling water can flow through each cooling plate 76. Note that cooling water is allowed to flow through the rear conductors 71f, 71r, the center conductor 73, and the left and right conductors 74l, 74r from the water supply and drainage holes provided in the left and right conductors 74l, 74r, and both terminal portions 72f, Cooling water is allowed to flow through the pipes 72b attached to the pipes 72r, so that the pipes 72r are cooled.

The electromagnetic inductor 70 configured as described above is disposed so that its central conductor 73 follows the movement range of the welded portion W of the ERW pipe P, and the terminal portions 72f and 72r are connected to each other.
When a high frequency power source is connected to the terminal section 72f, the current flows from the terminal section 72f to the left and right conductors 74l, 74r, the front conductor 72f, the center conductor 73, the rear conductor 72r, the left,
A current flows through the right conductors 74l, 74r and the terminal portion 72r in this order, and a current in the opposite direction to the current flowing through the center conductor 73 flows from the downstream side to the upstream side to the welded part W in the vicinity facing the center conductor 73. The welded portion W is heated by the Joule heat generated by this current, and annealing and normalization are performed.

In such a post-annealing apparatus, the electromagnetic inductor 70 is arranged such that the central conductor 73 is in contact with the welded portion W in order to increase the heating efficiency of the welded portion W.
Since the central conductor is arranged within 10 mm of the upper end of the core 75, it may come into contact with the electric resistance welded pipe due to bending of the electric resistance welded pipe, and may be damaged. In addition, if the central conductor is heated by radiant heat from the electric resistance welded pipe, the central conductor 73 may be damaged.
Since the cooling plate 76 and other components are placed on the tube, they cannot withstand the load and can cause damage such as bending or melting, and they often become unusable due to water leakage, etc. Each time this happens, the central conductor must be repaired or replaced.
This replacement work is extremely troublesome. For example, when replacing the central conductor 73, it is necessary to remove the many iron cores and cooling plates mounted on it, and it is also necessary to remove the front and rear conductors 7,
There were some drawbacks, such as the need to remove the soldering at both ends of the center conductor 73 to 71f and 71r.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a first conductor disposed along the welded portion passage area of the ERW pipe, and a method for energizing the first conductor. In a post-annealing apparatus comprising a second conductor disposed parallel to the first conductor and an iron core disposed so as to be electromagnetically coupled to the first and second conductors, the first conductor and the second conductor By connecting the center conductor detachably, the center conductor can be easily and quickly attached and detached, and if the center conductor is damaged, it can be easily repaired or replaced, which greatly improves heat treatment efficiency. To provide post-annealing equipment.

The present invention will be described in detail below with reference to the drawings showing the embodiments. Figure 4 is a perspective view of a post-annealing apparatus according to the present invention (hereinafter referred to as the present apparatus);
FIG. 5 is an enlarged cross-sectional view taken along line - in FIG. 4, FIG. 6 is a perspective view showing the mounting state of the central conductor as seen from below, and FIG. 7 is an exploded perspective view.
1r is a front and rear conductor, 2f and 2r are terminal portions, 3 is a central conductor which is the first conductor, 4l and 4r are
denotes the left and right conductors which are the second conductors, 5 denotes the iron core, 6
indicates a cooling plate. Front and rear conductors 1f and 1r
are installed at a required distance from each other, and a pair of gate-shaped terminal portions 2f, 2r are provided between them.
The front and rear conductors 1f and 1r are formed in a rectangular hollow plate shape when viewed from the front, and are provided with support projections 1a and 1a at the upper ends on both sides.
Additionally, brackets 1b, 1b protrude rearward from the rear conductor 1r and are fixed thereto by means of ribs 1c, 1c.

The terminal parts 2f and 2r are configured to form a gate shape when viewed from the front, and are integrally fixed together using bolts and nuts 2b with an insulating plate 2a interposed between them. Side conductor 1f, 1
Connect the terminal part 2f to the front conductor 1 at approximately the center between r.
f and the terminal portion 2r are disposed so as to face the rear conductor 1r. A central conductor 3 is installed at the lower end portions of the front and rear conductors 1f and 1r through below the terminal portions 2f and 2r,
Also, the left side between the front conductor 1f and the terminal section 2f, and between the rear conductor 1r and the terminal section 2r,
On the right side, left and right conductors 4l and 4r are installed in parallel, respectively.

As shown in FIG. 7, the central conductor 3 is hollowed out from the upper side of a solid copper rod to form a cooling water passage 3b separated by a partition wall 3a from near the front end to near the rear end. The opening part is hermetically sealed by fixing the cover plate 3c by welding, and a cap 3d for water passage is provided at both ends (only one side is shown).
is installed through it, and both ends are attached to mounting brackets 31f, 3.
1r is used to attach the front and rear conductors 1f and 1r. The mounting brackets 31f and 31r are both on the front,
Lower end brackets 1b, 1b of rear conductors 1f, 1r
Brackets 31a, 31 formed to have the same shape and size as
A clamping groove is provided at the center of the lower part of a to clamp the central conductor 3 by the stays 31b, 31b whose upper ends are bent outward at a required angle, and the support plates 31c, 31c supported by the stays. With both ends of the central conductor 3 fitted or fixed by welding, each bracket 31a, 31a is attached to the lower end bracket 1 of the front and rear conductors 1f, 1r using bolts and nuts 31e.
It is removably fixed to b and 1b.

On the other hand, the left and right conductors 4l, 4r are connected to the first,
It is almost the same as the conventional device shown in Figures 2 and 3, and is formed into a rectangular copper tube with a rectangular cross section, and one end of which communicates with the front and rear conductors 1f and 1r through their hollow parts. In addition, each other end is fixed to the terminal parts 2f and 2r with silver brazing, respectively, in an airtight sealed state, and a base 4c (only one side is exposed) is located near one end for cooling water flow. )
is installed. and the front and rear conductors 1
A large number of iron cores 5 and cooling plates 6 are alternately arranged in a rectangular air space surrounded by f, 1r, left and right conductors 4l, 4r. The iron core 5 is made of a silicon steel plate, and the cooling plate 6 is made of copper. Both have locking pieces 5a and 6a projecting laterally at the upper ends of both sides, the lower ends of both sides are cut off, and the central part of the lower end is cut off. Inverted U
It has a substantially rectangular shape with letter-shaped cutouts 5b and 6b, and is of the same shape and size, differing only in thickness, and its width is larger than the dimension between the left and right conductors 4l and 4r. is also slightly smaller, and the dimension between both locking pieces 5a, 6a is smaller than that of the left and right conductors 4l, 4.
Each iron core 5 and cooling plate 6 are formed to straddle the upper part of the central conductor 3 via their respective notches 5b and 6b, and the two locking pieces 5a, 6a is suspended on the upper surfaces of the left and right conductors 4l and 4r. An insulating material 3f is provided between the notches 5b, 6b of the iron core 5, cooling plate 6 and the central conductor 3 to avoid direct contact between them. , and the right conductors 4l and 4r are insulating materials 4a and 4r having an L-shaped cross section in order to avoid direct contact between them.
4a are interposed respectively. In addition, the insulating material 3f,
Although a glass laminate or the like is used as the material for 4a, it is not limited to this, and of course, any conventionally known heat-resistant material may be used.

On one surface of each cooling plate 6, pipes 6c, 2c for cooling water flow are attached to the same edge other than its upper edge, and to one surface of each terminal portion 2f, 2r, respectively, and the central conductor 3, left, It is connected to a pump (not shown) in the same manner as the conventional device shown in FIGS. 1 to 3 together with cooling water flow pipes (not shown) for the right conductors 4l, 4r and the front and rear conductors 1f, 1r,
A predetermined amount of cooling water is constantly allowed to flow through it to prevent its melting and damage. In addition, 7 in the figure is an insulating rod.

In the device of the present invention configured as described above, when a high frequency power source is connected to the terminal parts 2f and 2r, the current flows through the terminal part 2f, the left and right conductors 4l and 4r, the front conductor 1f, the center conductor 3, and the rear conductor. Side conductor 1r, left and right conductors 4l, 4r, terminal part 2
An induced current is generated in the welded part W of the electric resistance welded pipe P with the center conductor 3 facing each other through the path f, and the welded part W is heated by the Joule heat, and heat treatment such as tempering and normalizing is performed. will be applied.

The central conductor 3 has a hollow structure, and a partition wall 3a is formed in the center, so it is significantly strengthened structurally and has a high cooling effect.
The load of the cooling plate 6 itself is distributed to the left and right conductors 4l and 4r, which are the second conductors, and no load is applied to the center conductor 3, which is the first conductor, and it can be easily cooled by contact with the electric resistance welded pipe P. It will not be damaged by the electric resistance welded pipe P, nor will it be melted away by the radiant heat from the electric resistance welded pipe P. Moreover, even if the central conductor 3 is damaged, the mounting brackets 31f and 31r that fix the central conductor 3 to the front and rear conductors 1f and 1r can be easily removed by removing the bolts and nuts 31e. Therefore, there is no need to remove the iron core 5 and the cooling plate 6 as in the conventional case, and repair and replacement thereof can be easily and quickly performed.

FIGS. 8 and 9 are perspective views of other embodiments of the present invention, respectively, viewed from below. In the embodiment shown in FIG. 8, plate-shaped mounting brackets 31f', 31r' are directly fixed to the upper surface of both ends of the central conductor 3 by means such as brazing or bolting.
r' is fixed to screw holes provided in the lower end surfaces of the front and rear conductors 1f and 1r using bolts 31e'. Further, in the embodiment shown in FIG. 9, plate-shaped mounting brackets 31f'', 31r'' are similarly fixed to the front and rear end faces of the central conductor 3 by brazing or bolt fixing means, and these mounting brackets 31f'', 31r'' are fixed to the front and rear end faces of the central conductor 3. are removably fixed to the front and rear surfaces of the front and rear conductors 1f and 1r using bolts 31e''.The other configurations are the same as those of the embodiment shown in FIGS. The same numbers will be given to the parts and the explanation will be omitted.

In the case of the claimed device configured as described above,
The structure for attaching and detaching the center conductor 3 to and from the rear conductors 1f and 1r is further simplified, and the operation of attaching and detaching the center conductor 3 can be carried out easily and quickly.

As described above, in the present device, since the first conductor is detachably connected to the second conductor, it is extremely easy to attach and detach the first conductor, which is easily damaged and requires frequent replacement. , repair of the first conductor,
The present invention has excellent effects, such as being able to be replaced easily and quickly, and the efficiency of heat treatment of the welded portion of the electric resistance welded pipe being significantly improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the conventional device, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, Fig. 3 is a perspective view of the central conductor as seen from below, and Fig. 4 is a perspective view of the conventional device.
The figure is a perspective view of the proposed device, and Figure 5 is the same as Figure 4.
FIG. 6 is a perspective view from below showing the device configuration of the central conductor, FIG. 7 is an exploded perspective view, and FIGS. 8 and 9 are perspective views from below showing other embodiments of the present invention. It is a diagram. 1f, 1r...front and rear conductors, 1a...support protrusion, 1b...flange, 2f, 2r...terminal section, 3...center conductor (first conductor), 4l, 4r
... Left and right conductors (second conductor), 5 ... Iron core, 5
a... Locking piece, 5b... Notch, 6... Cooling plate,
6a... Locking piece, 6b... Notch, 6c... Pipe, P... ERW pipe, W... Welded part.

Claims (1)

[Scope of utility model registration request] A first conductor disposed along the welded portion passage area of the ERW pipe, a second conductor disposed parallel to the first conductor so as to conduct electricity thereto, and
A post-annealing apparatus comprising an iron core arranged to be electromagnetically coupled to a conductor, wherein the first
A post-annealing device characterized in that a conductor and a second conductor are detachably connected.