WO2007077701A1

WO2007077701A1 - Induction heating device

Info

Publication number: WO2007077701A1
Application number: PCT/JP2006/323998
Authority: WO
Inventors: Tetsuji Doizaki
Original assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
Priority date: 2005-12-28
Filing date: 2006-11-30
Publication date: 2007-07-12
Also published as: AU2006333894B2; JP2007175755A; KR20080080664A; BRPI0621273B1; CA2633942C; AU2006333894A1; BRPI0621273C8; BRPI0621273A2; KR101083914B1; KR20110091601A; CA2633942A1; CN101346196A; BRPI0621273B8; CN101346196B

Abstract

An induction heating device (1) is constructed from a heating section (2), feeding rollers (R), and a correction section (3) and is placed on the downstream side, relative to the conveyance direction, of a rolled material (P) paid out from a coil box (B). The heating section (2) has an inductor and heats the material (P) by using high-frequency induction. The feeding rollers (R) feed the rolled material (P) to the heating section (2). The correction section (3) is provided near the heating section (2) and limits the height of a warp the rolled material (P) to a predetermined level, thereby substantially increasing heating ability of the heating section (2) and preventing the rolled material (P) from coming into contact with the heating section (2).

Description

Specification

Induction heating device

Technical field

The present invention relates to an induction heating device used for heating a rolled material that is a material to be heated in a hot rolling production line.

Background art

In a hot rolling production line, a rolled material heated to a temperature at which it can be rolled by a heating furnace is roughly rolled by a roughing mill and formed into a so-called rough bar. The coarse bar is then temporarily wound on a coil by a coil box. Thereafter, the coarse bar is unwound from the coil bot and rolled by a finishing mill to obtain a rolled product having a desired plate thickness and width.

[0003] In such a hot rolling line, the rough bar from which the coil box force is also unwound has a full width heating device called a bar heater or an end portion called an edge heater for the purpose of preventing temperature drop or equalizing the temperature. In general, it is reheated by a heating device.

[0004] For example, in Japanese Patent Application Publication No. Hei 6-320202, an induction heater having a bar heater or edge heater force is disposed between a coil box and a descaling device, and the temperature in the descaling device is determined. A technique for preventing the reduction is disclosed.

[0005] As shown in FIG. 6, since the rolled material P is wound around the coil box B, the rolled material P is greatly waved after the coil box B force is also unwound. In the case where the rolled material P that is warped in this way is heated by the edge heaters 2a and 2b, in the conventional induction heating apparatus, the rolled material P becomes the edge heaters 2a and 2a unless the inductor gap is increased. There was the inconvenience of colliding with 2b. In addition, a large inductor gap is disadvantageous in that it reduces the heating capacity or effect.

Disclosure of the invention

[0006] The present invention has been made to solve the above-described disadvantages, and the object thereof is to correct the warp of the rough rolled material spun out of the coil box force, and thereby to substantially improve the heating capacity. It is to provide an induction heating apparatus. In order to achieve this object, a first aspect of the present invention includes a heating unit having a predetermined gap and configured to heat a material to be heated in the gap using high-frequency induction, and a target to be heated. A transport unit configured to transport the material and pass through the gap; and a correction unit configured to correct the warpage of the heated material so that the heated material transported by the transport unit does not contact the heating unit. An induction heating apparatus is provided.

[0008] According to the first aspect, since the straightening portion configured to correct the warp of the rolled material is provided so that the rolled material conveyed to the heating portion does not contact the heated portion, the coil box force反 The warped height of the rolled material is limited to a predetermined height. For this reason, it becomes possible to narrow the gap of the heating part. Therefore, the material to be heated can be efficiently heated, and as a result, the heating capability of the heating device can be substantially improved.

[0009] A second aspect of the present invention provides the induction heating apparatus according to the first aspect, wherein the correction part includes an inlet correction part provided at an inlet of a gap into which a material to be heated enters.

[0010] According to the second aspect, the warp height of the rolled material is limited by the inlet correction unit prior to entering the gap of the heating unit.

[0011] In a third aspect of the present invention, the correction unit includes an inlet correction unit provided at an entrance of a gap into which a material to be heated enters, and an outlet correction unit provided at an exit of a gap through which the material to be heated exits. An induction heating apparatus that is powerful in the first embodiment is provided.

[0012] According to the third aspect, in addition to the inlet straightening section, the outlet straightening section is provided at the outlet of the gap of the heating section, so that the warp height of the rolled material can be limited also at the outlet. Therefore, even if the preceding part warps as a result of the subsequent part of the rolled material being pushed down by the inlet straightening part, the warp height is limited.

[0013] A fourth aspect of the present invention provides the induction heating apparatus according to the third aspect, wherein the correction part further includes an intermediate correction part provided between the inlet correction part and the outlet correction part.

[0014] According to the fourth aspect, even if the subsequent portion is pushed down by the inlet correction portion and the preceding portion warps in response to this, the height of the warp is increased by the intermediate correction portion as in the case of the outlet correction portion. Limited.

[0015] In a fifth aspect of the present invention, the inlet correction section described above is a correction provided in parallel with the guide section inclined downward with respect to the conveyance direction of the material to be heated and the conveyance surface of the material to be heated. Surface and An induction heating apparatus as described above is provided.

[0016] According to the fifth aspect, even if the warp height of the rolled material conveyed to the heating unit exceeds a predetermined height, the rolled material is pushed downward by the guide unit. The warp height is limited efficiently.

[0017] A sixth aspect of the present invention provides the induction heating device described above, further comprising an adjustment mechanism that makes the height of the correction position where the inlet correction section abuts the material to be heated variable. In addition, a seventh aspect of the present invention provides the induction heating apparatus described above, further including an adjustment mechanism that makes the height of the correction position at which the outlet correction unit abuts the material to be heated variable.

[0018] According to these aspects, the height of the inlet correction section and the Z or outlet correction section can be variably set by the height adjustment mechanism, so that it depends on the thickness of the material to be heated and the gap interval of the heating section. The amount of correction can always be kept optimal.

[0019] In an eighth aspect of the present invention, the inlet correction section described above allows the material to be heated to pass through, an outlet having a height lower than the height of the inlet into which the material to be heated enters, There is provided an inductive heating device which has a slope portion provided between the outlets, and which is a rectangular tube configured to correct the warp of the material to be heated by the slope portion.

[0020] According to the eighth aspect, since the inclined portion is inclined downward with respect to the conveying direction of the material to be heated, when the rolled material is warped higher than the height of the outlet, After the entrance force is also applied, the inclined portion is pushed downward, thereby limiting the warp height of the rolled material.

Brief Description of Drawings

FIG. 1 (a) is a schematic plan view showing an induction heating device according to a first embodiment of the present invention, and FIG. 1 (b) is a diagram according to the first embodiment of the present invention. It is a side schematic diagram showing an induction heating device.

FIG. 2 is a graph showing the heating efficiency of the edge heater in the induction heating apparatus according to the first embodiment of the present invention.

[FIG. 3] FIG. 3 is a schematic side view showing an induction heating apparatus according to a second embodiment of the present invention. [FIG. 4] FIG. 4 (a) is an induction heating apparatus according to a second embodiment of the present invention. Plane outline showing the main part of FIG. 4 (b) is a perspective view showing a main part of the induction heating apparatus according to the second embodiment of the present invention.

FIG. 5 is a side view showing an induction heating device according to another embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional induction heating apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION

[0022] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] (1) First embodiment

(1 1) Configuration

As shown in FIG. 1, the induction heating device 1 according to the first embodiment of the present invention is arranged downstream of the coil box B with respect to the conveying direction of the rolled material P to be unwound. The induction heating apparatus 1 includes a heating unit 2, a plurality of feed rollers R, and a correction unit 3.

[0024] The heating unit 2 includes edge heaters 2a and 2b that have an inductor and heat a material to be heated using high-frequency induction. Specifically, the pair of edge heaters 2a is disposed at a position near the coil box B in the transport direction and faces each other with a predetermined gap in the vertical direction. In addition, another pair of edge heaters 2a are provided at an interval in a direction perpendicular to the conveyance direction. On the other hand, the pair of edge heaters 2b are arranged downstream of the edge heater 2a in the transport direction and face each other with a predetermined gap in the vertical direction. In addition, another pair of edge heaters 2b are provided at intervals in the direction perpendicular to the conveying direction.

Note that the edge heater 2a (2b) is positioned so as to be inserted between the gaps in the vertical direction at the end force in the width direction of the rolled material P conveyed by the feed roller R. Heat mainly.

[0026] The plurality of feed rollers R convey the material to be heated and pass the gap between the edge heater 2a and the gap between the edge heaters 2b. Hereinafter, the surface formed at the top of each feed roller R is referred to as a conveyance surface F, and the height from the conveyance surface F to the edge heaters 2a and 2b is defined as the inductor height Hi (FIG. 1 (b)).

[0027] The correction unit 3 includes an entrance correction unit 4, an exit correction unit 5, and an intermediate correction unit disposed therebetween. As shown in Fig. 1 (a), it is arranged to form a letter “H” when the upward force is also seen. The correction unit 3 corrects the warpage of the heated material so that the heated material passing between the edge heaters 2a (2b) does not contact the edge heaters 2a and 2b.

In detail, the inlet correction unit 4 is arranged upstream of the edge heater 2a and at a predetermined height h from the conveyance surface F. Further, the inlet correction part 4 has a width larger than the width of the rolled material P. The cross section of the entrance correction part 4 has an inverted trapezoidal shape as shown in FIG. 1 (b). That is, the inlet straightening section 4 has a guide section 4a that is inclined with respect to the transport surface F so as to push down the warped rolled material P downward, and the transport surface to correct the amount of warpage (height) of the rolled material P. And a correction surface 4b provided in parallel with F.

[0029] The outlet correction section 5 is located downstream of the edge heater 2b in the transport direction. In addition, the exit straightening portion 5 has a width larger than the width of the rolled material P. Similar to the entrance straightening portion 4, the exit straightening portion 5 has a guide portion 5a and a straightening surface 5b, and is configured so that its cross section has an inverted trapezoidal shape. Further, the exit straightening portion 5 is arranged so that the bottom surface of the straightening surface 5b has a predetermined height from the transport surface F, preferably the same height h as the entrance straightening portion 4.

[0030] As shown in FIG. 1 (b), the intermediate correction part 6 has a substantially rectangular plate shape when viewed from the side, and is provided between the inlet correction part 4 and the outlet correction part 6. . The lower surface of the intermediate correction portion 6 is located at the same height (h) as the correction surface 4b of the inlet correction portion 4 and the correction surface 5b of the outlet correction portion 5. Further, in this embodiment, the intermediate correction unit 6 is arranged above the rolled material P, at the center in the width direction of the rolled material P, and along the conveying direction.

[0031] It should be noted that the inlet correction unit 4, the intermediate correction unit 6, and the outlet correction unit 5 (correction unit 3) are configured to be lower than the above-described height h force S inductor height m. Specifically, it is preferable to calculate the position where the heating efficiency of the edge heater is highest and to set the edge heaters 2a and 2b lower than that position. Figure 2 shows the dependence of the heating efficiency of the edge heater on the inductor height (Hi). As illustrated in Figure 2, the heating efficiency is maximized when the inductor height Hi is 120 mm. Therefore, it is preferable to set the inductor height Hi to 120 mm and the correction surface height h to less than 120 mm, for example, 100 mm. . Also, determine the height h of the correction surface, considering the thickness of the rolled material P, which is the material to be heated as well as the heating efficiency of the edge heater.

[0032] The induction heating apparatus 1 of the present embodiment having the above-described constituent force operates as follows. The rolled material P is unwound from the coil box B and conveyed to the induction heating device 1 by the feed roller R.

[0033] When the warp height of the rolled material P measured from the conveying surface F is higher than the height h (for example, 100 mm) of the correction surface 4b, the rolled material P comes into contact with the guide portion 4a of the inlet correction portion 4, It is pushed down along the inclination of the guide part 4a. Next, the warp height of the rolled material P is limited to the height h or less of the correction surface 4b. Next, the rolled material P whose warp height is limited in this way is further conveyed by the feed roller R and reaches between the edge heaters 2b. Meanwhile, the warp height of the rolled material P is limited to a height h or less by the intermediate correction part 6. Further, when the rolled material P passes through the edge heater 2b, the exit straightening section 6 limits the warp height of the rolled material P to the height h or less.

[0034] According to the above configuration, the warp height of the rolled material P is limited to a height h (lOOmm) or less by the correction unit 3, and thus the rolled material P is prevented from contacting the edge heaters 2a and 2b. As a result, the edge heaters 2a and 2b can be prevented from being damaged or broken.

[0035] If the edge heaters are installed at intervals larger than the warp height of the rolled material P to prevent contact, the warped part of the rolled material P is sufficiently heated, but the conveying surface F The upper part (lower part) is not heated enough. In addition, if sufficient heat is applied to the lower part, the power supplied to the edge heater must be increased, so a heater with a larger heating capacity is required, and an increase in power consumption is inevitable. However, according to the induction heating apparatus 1 according to the present embodiment, since the inductor height Hi can be reduced by the correction unit 3, the power consumption can be prevented from becoming unnecessarily large, and the rolled material can be heated uniformly. Therefore, efficient heating is possible.

[0036] Further, since the inlet straightening portion 4 is formed in an inverted trapezoidal shape from the guide portion 4a and the straightening surface 4b, the conveyed rolled material P is pushed down by the guide portion 4a and subsequently straightened. The warp height is limited by being pressed down by surface 4b. Thus, the warp height of the rolled material P is limited to smooth, and the rolled material P is prevented from coming into contact with the edge heater 2a.

[0037] Even if the curvature of the leading portion of the rolling material P is limited by the inlet straightening portion 4, when the leading portion passes between the edge heaters _2a and 2b, the warping of the succeeding portion following the leading portion is performed. Is restricted by the inlet straightening part 4, the leading part warps and contacts the edge heaters 2a and 2b. there's a possibility that. However, in the present embodiment, the outlet straightening part 5 and the intermediate straightening part 6 provided between the inlet straightening part 4 and the outlet straightening part 5 react to the subsequent part being pushed down by the straightening part 4. Therefore, even when the leading portion warps, the warp height is limited, and the rolled material P can be prevented from coming into contact with the edge heaters 2a and 2b.

[0038] Furthermore, according to the induction heating apparatus 1 according to the present embodiment, the exit straightening section 5 limits the overall warp height of the rolled material P at the exits of the edge heaters 2a and 2b. As a whole can be limited to a predetermined height.

[0039] In this way, the whole of the rolled material P passing through the heating unit 2 is set to a predetermined height h or less by the inlet correction unit 4, the outlet correction unit 5 and the intermediate correction unit 6, that is, the correction unit 3 as a whole. Can be limited. As a result, the inductor height Hi can be lowered, the heating capacity of the edge heaters 2a and 2b can be used efficiently, and the rolling material P can be prevented from coming into contact with the edge heaters 2a and 2b.

[0040] (2) Second embodiment

Compared with the induction heating device 1 according to the first embodiment, the induction heating device 10 according to the second embodiment of the present invention is the same in terms of the configuration and arrangement of the edge heater and the feed roller R. The specific configuration is different. The following explanation focuses on the differences. In addition, the same or similar configurations or members as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

As shown in FIG. 3, the correction unit in the second embodiment includes an entrance correction unit 11, an exit correction unit 12, and an intermediate correction unit 13.

The entrance correction unit 11 is disposed upstream of the edge heater 2a with respect to the conveying direction of the rolled material P, and includes a height adjustment mechanism 11a and a correction roll l ib provided below the height adjustment mechanism 11a. The straightening roll l ib has a cylindrical shape and extends in parallel with the transport surface F longer than the width of the rolled material P. Further, the straightening roll l ib can contact the rolled material P conveyed between the edge heaters 2a (2b) by the feed roller R at the lower end (contact point) thereof. The height adjustment mechanisms 11a and l ib are configured using, for example, a motor, a ball screw, or the like, and adjust the height of the correction roll l ib provided below the height adjustment mechanism 11a and l ib. The height adjusting mechanism 11a can be configured by any known means. [0042] The outlet correction unit 12 is disposed downstream of the edge heater 2b provided downstream of the edge heater 2a with respect to the conveying direction of the rolled material P. The exit straightening unit 12 includes a height adjusting mechanism 12a and a straightening roll 12b that are configured and function in the same manner as the height adjusting mechanism 11a and the straightening roll 12a in the entrance straightening unit 11, respectively.

[0043] Further, the intermediate correction unit 13 is configured in a plate shape like the intermediate correction unit 6 in the first embodiment, and is attached to the height adjustment mechanisms lla and 12a. In detail, the height from the conveyance surface F of the rod-shaped correction surface which is the lower end of the intermediate correction unit 13 is the same as the height from the conveyance surface F of the contact point of the correction rolls l lb and 12b. In addition, since the intermediate correction unit 13 is attached to the height adjustment mechanism l la, 12 a, it can move up and down together with the correction rolls l lb, 12b by the vertical movement of the height adjustment mechanism l la, 12a. it can. Therefore, the contact point (correction point) of the intermediate correction unit 13 and the correction surfaces of the correction rolls l lb and 12b are always maintained at the same height.

[0044] As described above, the heating device 10 according to the second embodiment achieves the effects of the first embodiment, while the height adjustment mechanisms lla and 12a are used to correct the correction points of the correction rolls llb and 12b. The height of the intermediate correction part 13 with the correction surface can be arbitrarily determined and adjusted. For this reason, it is possible to always ensure an optimal setting value for the correction point of the conveying surface F force or the height of the correction surface based on the thickness of the rolled material and the inductor height of the edge heater.

[0045] Therefore, the warp height of the rolled material unwound from the coil box and conveyed to the induction heating device 10 can be limited to the optimum set value or less. As a result, the inductor height Hi of the edge heaters 2a and 2b can be reduced, and the edge heaters 2a and 2b can be operated efficiently. In addition, the heating capability of the edge heaters 2a and 2b can be substantially improved.

[0046] (3) Third embodiment

The induction heating device 20 according to the third embodiment of the present invention is the same in configuration and arrangement of the edge heater and the feed roller R as compared with the induction heating devices 1 and 10 according to the first and second embodiments. On the other hand, there is a difference in the specific configuration of the entrance correction part of the correction part. The following description focuses on the differences. In addition, the same or similar components or members as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted. [0047] In the induction heating device 20 according to the third embodiment, as shown in Fig. 4, the inlet straightening unit 21 has two surfaces that are perpendicular to the conveying direction of the rolled material P, and the side surface with respect to that direction is a table. It has a substantially hexahedral shape. Specifically, the inlet correction section 21 has a wide opening 21a facing the incoming direction of the rolled material P, and a narrow opening 21b provided downstream of the wide opening 21a in that direction. The bottom surface of the inlet correction section 21 forms the same surface as the conveyance surface F, the height of the wide opening 21a is set to be almost the same as the inductor height of the edge heaters 2a and 2b, and the height of the narrow opening 21b is rolled. Set to the warp height of material P to be restricted. Due to the difference in height between the wide opening 21a and the narrow opening 21b, the upper inner surface 21c of the inlet correction section 21 is inclined downward along the conveying direction of the rolled material P.

[0048] According to the above configuration, the rolled material P that has been unwound by the coil box force enters the inlet correction section 21 from the wide opening 21a before reaching the edge heater 2a. Thereafter, the rolled material P advances while its warp height is regulated along the inclination of the upper and inner surfaces of the inlet correction portion 21, and comes out of the narrow opening 21 b of the inlet correction portion 21.

[0049] After that, the rolled material P may pass through the induction heating device 20 while the warp height is limited by the action of the intermediate correction part and the outlet correction part described in the first and second embodiments. it can. That is, according to the third embodiment, the warp height of the rolled material P can be maintained below the optimum set value, so that the edge heaters 2a and 2b can be operated efficiently. In addition, the heating capacity of the edge heaters 2a and 2b can be substantially improved.

[0050] (4) Other embodiments

The present invention can be variously changed or modified without being limited to the first to third embodiments. For example, the thickness of the intermediate correction part in the first to third embodiments can be arbitrarily changed as long as the intermediate correction part does not interfere with the edge heater.

[0051] In the first to third embodiments, the edge heater may be provided at two locations along the conveyance direction of the rolled material P. The edge heater may be provided only at one location between the entrance correction portion and the exit correction portion. And

You may provide in three places.

[0052] Further, instead of Z and 13, or in addition to the intermediate correction portions 6, 13, and 23, an additional intermediate correction portion 7 may be provided on the same surface as the conveyance surface F as shown in FIG. Intermediate correction part 7 Correcting the amount of warping of the rolled material P from the top and bottom in cooperation with the normal part 4, the exit straightening part 5 and the intermediate straightening parts 6, 13, 23 (or the inlet straightening part 4 and the outlet straightening part 5) Is possible. Note that the specific configuration such as the shape and thickness of the intermediate correction portion 7 can be designed as appropriate. For example, the lateral width (the length in the direction orthogonal to the conveying direction of the rolled material P) may be the same as that of the intermediate correction unit 6 or may be substantially the same as the lateral width of the rolled material P.

Industrial applicability

The induction heating device according to the present invention is suitably used for a hot rolling production line. According to this induction heating apparatus, since the warpage of the rolled material, which is the material to be heated, is corrected, the interval between the heating portions for heating the rolled material can be narrowed, and efficient heating is provided. In addition, the rolled material is prevented from coming into contact with the heating part, and damage or failure of the heating part is avoided. Therefore, the present invention contributes to efficient operation and power saving when applied to the production line.

Claims

The scope of the claims

[1] A heating section (2) having a predetermined gap and configured to heat the material to be heated (P) in the gap using high-frequency induction,

A conveying section (R) configured to convey the heated material (P) and pass through the gap, and the heated material (P) conveyed by the conveying section are in contact with the heating section (2). A straightening part (3) configured to correct the warp of the heated material (P) as follows:

An induction heating device comprising:

[2] The induction according to claim 1, wherein the correction part (3) includes an inlet correction part (4, 11, 21) provided at an inlet of the gap into which the heated material (P) enters. Heating device.

[3] The straightening section (3) includes an inlet straightening section (4, 11, 21) provided at an inlet of a gap into which the heated material (P) enters, and a gap between the heated material (P) through the gap. The induction heating device according to claim 1, further comprising an outlet correction section (5, 12) provided at the outlet.

[4] The correction part (3) further includes intermediate correction parts (6, 13, 23) provided between the inlet correction part (4) and the outlet correction part (5). The induction heating apparatus according to item 3.

[5] The inlet correction section (4) includes a guide section (4a) inclined downward with respect to the conveyance direction of the material to be heated, and a correction surface (4b) provided in parallel with the conveyance surface of the material to be heated. The induction heating device according to any one of claims 2 and 4, wherein the range of the claim is the second term force.

[6] The force according to claim 2 further includes an adjustment mechanism (11a) that makes the height of the correction position where the inlet correction part (11) contacts the heated material (P) variable. The induction heating device according to any one of the above.

[7] The force according to claim 3, further comprising an adjustment mechanism (12a) for changing the height of the correction position where the outlet correction section (12) contacts the heated material (P). The induction heating device according to any one of the above.

[8] The inlet straightening section (21) allows the passage of the heated material (P) and has an outlet (21b) having a height lower than the height of the inlet (21a) into which the heated material enters. A rectangular tube having an inclined portion (21c) provided between the inlet (21a) and the outlet (21b), and configured to correct warpage of the heat-receiving material (P) by the inclined portion (21c). (21) From Claim 2 The induction heating device according to item 4 of item 4.