CN102921727B - An orientation electromagnetic steel plate operating line and induction heating apparatus - Google Patents
An orientation electromagnetic steel plate operating line and induction heating apparatus Download PDFInfo
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- CN102921727B CN102921727B CN201110440674.XA CN201110440674A CN102921727B CN 102921727 B CN102921727 B CN 102921727B CN 201110440674 A CN201110440674 A CN 201110440674A CN 102921727 B CN102921727 B CN 102921727B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Provided is an orientation electromagnetic steel plate operating line and induction heating apparatus which may produce orientation electromagnetic steel plates with low iron loss under the circumstance without upsizing a facility and which is used in an orientation electromagnetic steel plate operating line. The orientation electromagnetic steel plate operating line and induction heating apparatus comprises a strip coil box (3) and an induction heating apparatus (4). The strip coil box (3) is arranged between a rough rolling process and a precision rolling process of a hot rolling operating line. The strip coil box (3) winds the delivering bar into a cylinder with a hollow center portion. The induction heating apparatus (4) heats a delivering strip coil (8b) formed by the strip coil box (3) when the cylinder is kept.
Description
Technical field
The present invention relates to a kind of manufacturing operation line for the manufacture of orientation electromagnetic steel plate and the induction heating apparatus for carrying out eddy-current heating to metal material.
Background technology
Fig. 8 is the figure of the major part representing existing hot rolling production line.
In fig. 8, symbol 21 is roughing operations, and symbol 22 is coil box (coil box), and symbol 23 is finishing rolling step.Steel billet 24a (rolled base material) in heating furnace 26 (not shown in Fig. 8) by heating and about soaking to 1250 DEG C after, and be rolled processing in roughing operation 21.Steel billet 24a is by carrying out roughing operation 21, and its thickness becomes twenties [mm] ~ forties [mm] left and right from [mm] more than more than 100 [mm] ~ 200 left and right.
Coil box 22 is arranged between roughing operation 21 and finishing rolling step 23.Coil box 22 has following function: the cylindric roll coil of strip rolled base material (conveying bar 24b) after complete all rollings processing in roughing operation 21 being wound into central part hollow.In addition, coil box 22 also has following function: conveying bar 24b uncoiling (sending) will reeled in finishing rolling step 23 side.
Coil box 22 is arranged to carry out for the purpose of soaking and insulation conveying bar 24b.The time of processing rolled base material in the finishing rolling step 23 after roughing operation 21 will about relatively long a few minutes.In addition, the heat energy of rolled base material (conveying bar 24b) scatters and disappears mainly through radiation.By utilizing coil box 22 that conveying bar 24b is wound into cylindrical shape, thus compared with during in tabular, the surface area that rolled base material contacts with extraneous gas can be reduced significantly.By arranging coil box 22, the temperature of the conveying bar 24b for entering finishing rolling step 23 can be held in high temperature and evenly.
Fig. 9 is the figure of the major part of the manufacturing operation line representing existing orientation electromagnetic steel plate.Fig. 9 is equivalent to add intermediate heating furnace 25 in above-mentioned existing hot rolling production line.Symbol 26 is heating furnaces.
Orientation electromagnetic steel plate is the steel plate of specific direction by the orientation of easy magnetization axis of iron crystallization.Orientation electromagnetic steel plate can be used in the iron core of the electrical equipments such as such as transformer because reducing iron loss.
As the prior art of orientation electromagnetic steel plate, such as, there is the content described in following patent document 1.
In order to manufacture the raw-material steel billet 24a as orientation electromagnetic steel plate, first, pure iron being heated to more than fusing point and becoming liquid.Then, in pure iron, add the impurity such as the silicon of several [%] and stir, afterwards, carry out casting and make it solidify.Material after above-mentioned solidification is steel billet 24a.Steel billet 24a is by many crystalline solid of the various crystallized mixed such as the body-centered cubic lattic of face-centered cubic lattice very high for the solid solubility limit of impurity, hardly solid solution impurity.Above-mentioned state is called solid solution.In addition, the principal component of the many crystallizations forming the steel billet 24a after casting is called parent phase crystallization.
From heating furnace 26 extract out steel billet 24a the hot rolling production line shown in Fig. 9 via rolling manufacturing procedure and tropism control operation, formed the torrid zone volume.In addition, the manufacturing operation line of orientation electromagnetic steel plate is made up of hot rolling production line and cold rolling and heat treatment line.Fig. 9 only represents the hot rolling production line of the upstream process being in cold rolling and heat treatment line.In hot rolling production line, the easy magnetizing axis of iron crystallization is made to put together towards a direction such tropism control as far as possible, while make rolled base material thinning.Then, after the operation of hot rolling production line terminates, rolled base material is sent to the cold rolling of lower procedure and heat treatment line.Main in heat treatment line, the semi-finished product instant heating roll coil of strip produced by hot rolling position is called to the technique of " nibbling ".Nibble in technique this, the crystallization displacement that the crystallization with the easy magnetizing axis of same orientation can make surrounding knot crystal structure in addition identical with self structure.By this, final products and the less orientation electromagnetic steel plate of iron loss can be obtained.
Specifically, first the steel billet 24a extracted out from heating furnace 26 is rolled processing the roughing operation 21 of hot rolling production line.Once steel billet 24a is processed by rolling and produces the compression on thickness direction, then crystallization can be shifted towards the length direction of steel billet 24a, and by grain refined.
If placed for a long time by the steel billet 24a producing compression, then by recrystallizing and Aging effect, parent phase crystallization can be grown up.Now, if adjust the temperature of steel billet 24a aptly, then the crystalline texture containing the interpolation impurity much reaching solid solubility limit can be made to separate out around the parent phase crystallization after growth, by this, the crystalline growth of the easy magnetizing axis with same orientation can be made selectively.This operation is called tropism control operation (or being only called tropism control).
Tropism control operation is carried out in intermediate heating furnace 25.Intermediate heating furnace 25 is arranged on roughing operation 21 midway, between the First milling train 27 had in such as roughing operation 21 and second milling train 27, so that can tropism control be carried out.From heating furnace 26 extract out steel billet 24a after completing the processing undertaken by First milling train 27 roughing operation 21, be carried to intermediate heating furnace 25.
In addition, the rolling carried out before tropism control operation processing is called preparation rolling processing (its operation being called preparation rolling process).
In tropism control operation, steel billet 24a stops the long time (such as several tens minutes) in intermediate heating furnace 25.Therefore, intermediate heating furnace more than 25 is arranged on the outside of the hot rolling production line shown in Fig. 8.As long as said structure, then, during the heating carrying out steel billet 24a in intermediate heating furnace 25 and insulation, the manufacture of the kind (such as ordinary steel etc.) outside orientation electromagnetic steel plate can be carried out in roughing operation 21 and finishing rolling step 23.In addition, the furnace temperature of heating furnace 26 is set as the temperature being suitable for the kind manufactured outside orientation electromagnetic steel plate, such as, be set to 1250 [DEG C] left and right.By this, the utilization rate of production line can be improved.
On the other hand, the temperature being suitable for tropism control operation is more than 1300 [DEG C].Therefore, the steel billet 24a of orientation electromagnetic steel plate is heated to 1250 [DEG C] left and right in heating furnace 26, and carried out preparation rolling processing (creating compression) in a part for roughing operation 21 after, heat again in intermediate heating furnace 25, thus the desired temperature of more than 1300 [DEG C] can be remained on.After tropism control operation terminates, steel billet 24 gets back to roughing operation 21 from intermediate heating furnace 25, and remaining number of channels in the rolling scheme of rolling processing roughing operation 21.
Figure 10 is the structure chart of the intermediate heating furnace shown in Fig. 9.Intermediate heating furnace 25 to heat it and is incubated under steel billet 24a is in the state of roughing operation 21 midway, state namely in tabular.Intermediate heating furnace 25 shown in Figure 10 is by the stove of eddy-current heating to the mode that steel billet 24a heats.
Intermediate heating furnace 25 such as forms its major part by heating and thermal insulating container 28, solenoid coil 29, high-frequency electrical converter 30, loading machine 31, table 32.
Heating and thermal insulating container 28 is for steel billet 24a being housed in inner component.Heating and thermal insulating container 28 is located at the top of table 32.Table 32 is loaded into machine 31 and is supported to and can moves freely in the vertical direction, and forms the bottom of heating and thermal insulating container 28.That is, if table 32 is loaded into machine 31 and moves upward, and is installed on heating and thermal insulating container 28 from below, then the inner space of heating and thermal insulating container 28 can be made airtight, and the air-tightness that specifies can be guaranteed.Solenoid coil 29 twists in heating and thermal insulating container 28 around.High-frequency electrical converter 30 is connected with solenoid coil 29.
After completing preparation rolling processing, steel billet 24a is carried to the intermediate heating furnace 25 of said structure, and with the state mounting on the upper surface standing in table 32.In intermediate heating furnace 25, when being positioned on table 32 by steel billet 24a, by loading machine 31, table 32 is moved upward, thus steel billet 24a is loaded the inside of heating and thermal insulating container 28.Once the lower face side of heating and thermal insulating container 28 is closed by table 32, then the air-tightness of regulation can be guaranteed in the inside of heating and thermal insulating container 28.
When steel billet 24a is incorporated in the inside of heating and thermal insulating container 28, in intermediate heating furnace 25, utilize high-frequency electrical converter 30 make solenoid coil 29 excitation and produce alternating magnetic field, thus produce vortex flow in steel billet 24a.By this, steel billet 24a is heated in the inside of heating and thermal insulating container 28.In order to produce vortex flow efficiently in steel billet 24a, preferably the frequency of alternating magnetic field is higher.But if frequency is too high, then magnetic flux can cannot enter the inside of steel billet 24a because of kelvin effect, therefore, high frequency electric is set as 300 [Hz] left and right.
In addition, when heating steel billet 24a, be full of the inside of heating and thermal insulating container 28 with inert gas or reducibility gas, thus can prevent from forming oxide scale film (incrustation scale) on the surface of steel billet 24a.
In the following prior art that Patent Document 2 discloses intermediate heating furnace.
After end tropism control operation, steel billet 24a gets back in roughing operation 21, and in roughing operation 21, carry out remaining rolling scheme.
After finishing roughing processing all in roughing operation 21, rolled base material (conveying bar 24b) is wound into by coil box 22 cylindrical shape that central part is hollow.After this, rolled base material uncoiling in coil box 22, and be supplied to finishing rolling step 23 side.
In finishing rolling step 23, rolled base material carries out finish rolling processing at short notice by the continuous fine milling train 33 be made up of four to seven frames quickly.By this, the easy magnetizing axis being rolled the crystallization of base material is shifted towards a direction, orientation.After end finishing rolling step 23, while controlled cooling model speed suitably, water-cooled is carried out to rolled base material, thus easy magnetizing axis is fixed towards a direction.
Patent document 1: Japanese Patent Laid-Open 2006-265685 publication
Patent document 2: Japanese Patent Laid-Open 6-17131 publication
In the hot rolling production line shown in Fig. 9, the rolling scheme of roughing operation 21 is generally about five to seven roads.If increase the number of channels of preparation rolling processing, then can reduce the number of channels of carrying out after tropism control operation.But, due to steel billet 24a be rolled in process elongated, therefore, if increase preparation rolling processing number of channels, then exist must build the such problem of longer intermediate heating furnace 25.
In reality, be difficult to manufacture the longer heating and thermal insulating container 28 of high-air-tightness and longer solenoid coil 29.Therefore, in the past, the furnace superintendent of heating and thermal insulating container 28 was set to 15 [m] left and right, and was set to 11 [m] left and right by maximum for the length of the steel billet 24a loading heating and thermal insulating container 28.
In addition, as long as shorten the length of steel billet 24a when extracting out from heating furnace 26, just can increase the number of channels of preparation rolling processing, and reduce the number of channels of carrying out after tropism control operation.But if shorten the length of steel billet 24a when extracting out from heating furnace 26, then the length of semi-finished product (tropical roll up) that steel billet 24a can manufacture shortens.And, even if shorten the length of steel billet 24a when extracting out from heating furnace 26, also shorten the time required for roughing operation 21 hardly, the productivity ratio of hot rolling production line can be made significantly to reduce.Therefore, in the past, the length of steel billet 24a when extracting out from heating furnace 26 was increased as far as possible, and the number of channels (being such as restricted to about one) of restriction preparation rolling process.
Therefore, in the past, can exist can because of roughing processing afterwards again towards the situation of any direction displacement by the easy magnetizing axis of the crystallization of orientation rightly in tropism control operation.That is, in above-mentioned existing manufacture method, exist and be difficult to manufacture the such problem of the less orientation electromagnetic steel plate of iron loss.
Summary of the invention
The present invention, for solving the problems of the technologies described above and doing, its object is to provide a kind of and when not making equipment enlarging, can produce the manufacturing operation line of the less orientation electromagnetic steel plate of iron loss.
In addition, other object is to provide a kind of induction heating apparatus that can play above-mentioned effect in the manufacturing operation line of orientation electromagnetic steel plate.
The manufacturing operation line of orientation electromagnetic steel plate of the present invention, for the manufacture of orientation electromagnetic steel plate, comprising: coil box, between the roughing operation that this coil box is arranged on hot rolling production line and finishing rolling step, conveying bar is wound into the cylindrical shape that central part is hollow; And induction heating apparatus, heat when this induction heating apparatus twists in keep cylindric to the conveyer belt shaping by coil box.
Induction heating apparatus of the present invention is that the plate-shaped metal material of the cylindrical shape of hollow heats when keeping cylindric to being wound into central part, it comprises: solenoid coil, and this solenoid coil is configured in hollow bulb and the outside of metal material along the width of metal material; And field element, this field element carries out excitation to solenoid coil, to heat metal material.
According to the present invention, in the manufacturing operation line of orientation electromagnetic steel plate, when not making equipment enlarging, the orientation electromagnetic steel plate that iron loss is less can be produced.
Accompanying drawing explanation
Fig. 1 is the figure of the major part of the manufacturing operation line of the orientation electromagnetic steel plate representing embodiment of the present invention 1.
Fig. 2 is the stereogram representing the induction heating apparatus arranged in the manufacturing operation line of Fig. 1.
Fig. 3 is the side view representing the induction heating apparatus arranged in the manufacturing operation line of Fig. 1.
Fig. 4 is the rearview representing the induction heating apparatus arranged in the manufacturing operation line of Fig. 1.
Fig. 5 is the figure of the action for illustration of the induction heating apparatus arranged in the manufacturing operation line of Fig. 1.
Fig. 6 is the figure of the major part of the manufacturing operation line of the orientation electromagnetic steel plate representing embodiment of the present invention 2.
Fig. 7 is the figure of the function of induction heating apparatus for illustration of embodiment of the present invention 2.
Fig. 8 is the figure of the major part representing existing hot rolling production line.
Fig. 9 is the figure of the major part of the manufacturing operation line representing existing orientation electromagnetic steel plate.
Figure 10 is the structure chart of the intermediate heating furnace shown in Fig. 9.
(symbol description)
1,26 heating furnaces
2,21 roughing operations
3,22 coil boxs
4 induction heating apparatuses
5,23 finishing rolling step
6 water cooling plants
7 up-coilers
8a, 24a steel billet
8b carries the roll coil of strip
8c end
9,27 milling trains
10,28 heating and thermal insulating containers
11 Handling devices
The standby cradle roll of 11a and supporting arrangement
11b connector
12 heaters
13 supporting stations
14 guide rails
15,15a, 15b, 15c, 15d cradle roll
16 wheels
17,29 solenoid coils
17a electric conductor
17b short-circuiting device
18 supporting arrangements
19,30 high-frequency electrical converters
20,33 continuous fine milling trains
24b carries bar
25 intermediate heating furnaces
31 load machine
32 tables
Detailed description of the invention
With reference to accompanying drawing, the present invention is described in detail.In the various figures, identical symbol is marked to same or equivalent part.In the following description, the content repeated suitably is simplified or omitted.
Embodiment 1
Fig. 1 is the figure of the major part of the manufacturing operation line of the orientation electromagnetic steel plate representing embodiment of the present invention 1.
There is orientation electromagnetic steel plate and non orientation electromagnetic steel plate in electromagnetic steel plate.Fig. 1 represents the hot rolling production line for the manufacture of orientation electromagnetic steel plate.Orientation electromagnetic steel plate is the steel plate of specific direction by the orientation of easy magnetization axis of iron crystallization.Orientation electromagnetic steel plate can be used in the iron core of the electrical equipments such as such as transformer because reducing iron loss.The manufacturing operation line of orientation electromagnetic steel plate is made up of the hot rolling production line of upstream side and the cold rolling and heat treatment line in downstream.In the present embodiment, only hot rolling production line is described, and omits about explanation that is cold rolling and heat treatment line.
As shown in Figure 1, in hot rolling production line, heating furnace 1, roughing operation 2, coil box 3, induction heating apparatus 4, finishing rolling step 5, water cooling plant 6, up-coiler 7 is provided with.
Manufacture method as the raw-material steel billet 8a (rolled base material) of orientation electromagnetic steel plate is as in the past.That is, in order to manufacture steel billet 8a, first, pure iron being heated to more than fusing point and becoming liquid.Then, in pure iron, add the impurity such as the silicon of several [%] and stir, afterwards, carry out casting and make it solidify, and cutting into several [m] to tens [m].
Specifically, steel billet 8a is overall to be heated by heating furnace 1 and soaking to 1250 [DEG C] left and right, and is extracted on production line (carrying implement).The steel billet 8a extracted out from heating furnace 1 has the thickness of such as [mm] more than [mm] to 200 more than 100 left and right.
The milling train 9 of a frame or multi-frame is provided with in roughing operation 2.Milling train 9 both can be reversible mill, also can be non-reversing mill.When being provided with milling train 9 of multi-frame (being four frames in the example depicted in figure 1), also reversible mill and non-reversing mill can be combined to form roughing operation 2.
When steel billet 8a is rolled and is worked into the final road of rolling scheme in roughing operation 2, thickness becomes twenties [mm] to forties [mm] left and right, and length becomes tens [m] to 100 [m] left and right.In addition, rolled when being worked into final road in roughing operation 2, the temperature of rolled base material is reduced to such as 1000 [DEG C] to 1100 [DEG C] left and right.
The rolled base material being worked into the state in final road rolled in roughing operation 2 is called conveying bar.
Coil box 3 is arranged between roughing operation 2 and finishing rolling step 5.Coil box 3 has following function: conveying bar is wound into the cylindric roll coil of strip that central part is hollow.In addition, coil box 3 also has following function: the conveying bar uncoiling (sending) will reeled in finishing rolling step 5 side.
Coil box 3 is in order to carry out soaking to the rolled base material (conveying bar) after the processing finished in roughing operation 2 and insulation is arranged.Do not have to arrange the axle (plug) etc. for the conveying bar that reels in coil box 3.Coil box 3 is wound into the cylindrical shape that central part is hollow while making the conveying bar of tabular suitably rotate.Therefore, the space (hollow bulb) that there is not rolled base material on axially (carrying the axis of bar) is formed at the central part being wound into cylindric rolled base material (conveying bar) by coil box 3.This hollow bulb is called rolled eye (Japanese: コ イ Le ア イ).
Conveying roll coil of strip 8b is called by being wound into the rolled base material (conveying bar) that central part is the cylindrical shape of hollow by coil box 3.
Induction heating apparatus 4 is the devices for heating to the conveying roll coil of strip 8b shaping by coil box 3 when keeping cylindric and be incubated.In induction heating apparatus 4, by eddy-current heating, conveying roll coil of strip 8b is remained on 1350 DEG C to about 1400 DEG C, thus desired crystallization is grown up in conveying roll coil of strip 8b.That is, in this hot rolling production line, in induction heating apparatus 4, tropism control operation is carried out.
Below, with reference to Fig. 2 to Fig. 4, the structure of induction heating apparatus 4 is specifically described.
Fig. 2 is the stereogram representing the induction heating apparatus arranged in the manufacturing operation line of Fig. 1, and Fig. 3 is its side view, and Fig. 4 is its rearview.
Heating and thermal insulating container 10, Handling device 11, heater 12 is provided with in induction heating apparatus 4.
Heating and thermal insulating container 10 is for conveying roll coil of strip 8b is housed in inner component.Heating and thermal insulating container 10 is formed the gateway (not shown) for conveying roll coil of strip 8b turnover.In addition, in heating and thermal insulating container 10, be provided with the gas-tight door (not shown) for the above-mentioned gateway of opening and closing.After closing gas-tight door rightly, the air-tightness specified can be guaranteed in the inside of heating and thermal insulating container 10.Under the state appropriately closing gas-tight door, conveying roll coil of strip 8b is heated in the inside of heating and thermal insulating container 10 and is incubated.
The element (atmosphere holding element: not shown) for the inside of heating and thermal insulating container 10 being held in regulation atmosphere is provided with in induction heating apparatus 4.Atmosphere holding element is the element for preventing from being formed on the surface of conveying roll coil of strip 8b when heating conveying roll coil of strip 8b and be incubated oxide scale film (incrustation scale).When heating conveying roll coil of strip 8b and be incubated, atmosphere holding element, by such as the inside of heating and thermal insulating container 10 being formed vacuum or being full of the methods such as the inside of heating and thermal insulating container 10 with the inert gas (such as nitrogen) of high temperature or reducing gas (such as hydrogen), prevents the surface formation incrustation scale at conveying roll coil of strip 8b.
Handling device 11 is the devices for the conveying roll coil of strip 8b shaping by coil box 3 to be carried to heating and thermal insulating container 10 from coil box 3 when keeping cylindric.Handling device 11 such as forms its major part by supporting station 13, guide rail 14, cradle roll 15.
Supporting station 13 is the components for supporting conveying roll coil of strip 8b.The lower surface of supporting station 13 can rotatably be provided with the wheel 16 that can roll on guide rail 14.That is, supporting station 13 is configured to move along guide rail 14 under the state supported conveying roll coil of strip 8b.Guide rail 14 is laid between coil box 3 and heating and thermal insulating container 10.In the present embodiment, also guide rail 14 is laid on the inside of heating and thermal insulating container 10.Therefore, in the present embodiment, supporting station 13 moves along guide rail 14 between coil box 3 and heating and thermal insulating container 10 inside.In addition, roll coil of strip 8b is carried to be heated under the state supported by supporting station 13 and be incubated.
When supporting station 13 is supported conveying roll coil of strip 8b, cradle roll 15 forms the part of actual bearer conveying roll coil of strip 8b.Cradle roll 15 is arranged to rotate freely on supporting station 13.In the present embodiment, a pair cradle roll 15 is opened the mode level of predetermined distance with sky and is arranged on abreast on identical height on the upper surface of supporting station 13.As shown in Figures 2 to 4, in the Handling device 11 with the cradle roll 15 adopting said structure, conveying roll coil of strip 8b configures in axis (left and right directions in Fig. 3) mode consistent with the axis of cradle roll 15.In addition, the mode of carrying roll coil of strip 8b to be configured between cradle roll 15 with foot is carried on the cradle roll 15 on both sides equably.
Handling device 11 is provided with the drive unit (not shown) for driving cradle roll 15.When heating conveying roll coil of strip 8b, drive unit makes cradle roll 15 drive (rotation), rotates to make conveying roll coil of strip 8b.Conveying roll coil of strip 8b with axis and cradle roll 15 axially unanimously and the mode that its outer peripheral face contacts with the outer peripheral face of cradle roll 15 be carried on cradle roll 15.Therefore, by the rotation of cradle roll 15, conveying roll coil of strip 8b rotates towards with the direction of rotation and contrary direction of cradle roll 15 centered by its hollow bulb.
Heater 12 is the devices carrying out under the state for being carried at conveying roll coil of strip 8b in the inside of heating and thermal insulating container 10 on the cradle roll 15 of Handling device 11 heating and being incubated.Heater 12 forms its major part by solenoid coil 17, supporting arrangement 18, high-frequency electrical converter 19 (field element).
As shown in Figure 2, when heating conveying roll coil of strip 8b and be incubated, solenoid coil 17 configures in the mode of the surrounding surrounding the part be configured on the upside of conveying roll coil of strip 8b.
Specifically, solenoid coil 17 is applied in its part and carries the mode of the hollow bulb (rolled eye) be formed centrally in the axle of roll coil of strip 8b to be flatly configured at above-mentioned hollow bulb along the width of conveying roll coil of strip 8b.In addition, solenoid coil 17 configures side from an above-mentioned part upward in the both sides of conveying roll coil of strip 8b, and with the mode horizontal arrangement again towards conveying roll coil of strip 8b side above conveying roll coil of strip 8b.That is, another part of solenoid coil 17 is to carry the mode forming specified gap between the outer peripheral face of roll coil of strip 8b along carrying the width horizontal arrangement of roll coil of strip 8b outside the peripheral part of conveying roll coil of strip 8b.
Solenoid coil 17 is divided into electric conductor 17a and short-circuiting device 17b.As shown in Figure 3, it is コ font (horizontal U-shaped) that electric conductor 17 such as forms side-looking, and at a side opening.Short-circuiting device 17b is used for connecting between the end being formed at electric conductor 17a.By being appropriately connected between short-circuiting device 17b with the end of electric conductor 17a, thus electric conductor 17a and short-circuiting device 17b is made to be formed as continuous print helical form.That is, being formed as the spiral helicine component of this continuous print is solenoid coil 17.
Solenoid coil 17 (electric conductor 17a, short-circuiting device 17b) is supported by supporting arrangement 18.At least one party of electric conductor 17a and short-circuiting device 17b is supported to and can moves freely in the direction of the width relative to the conveying roll coil of strip 8b under the state being carried on cradle roll 15 by supporting arrangement 18.
High-frequency electrical converter 19 is the devices heated conveying roll coil of strip 8b for carrying out excitation to solenoid coil 17.
Then, the action of the induction heating apparatus 4 with said structure is described.
The conveying roll coil of strip 8b shaping by coil box 3 is wound on the cradle roll 15 of the Handling device 11 be arranged in coil box 3.When carrying roll coil of strip 8b to be carried on cradle roll 15, supporting station 13 moves on guide rail 14, conveying roll coil of strip 8b to be carried to the inside of heating and thermal insulating container 10.After conveying roll coil of strip 8b is carried to heating and thermal insulating container 10 inside, close gas-tight door, and the nitrogen of such as high temperature is sent into the inside of heating and thermal insulating container 10.
When the supporting station 13 being equiped with conveying roll coil of strip 8b stops on the assigned position of heating and thermal insulating container 10 inside, form solenoid coil 17 by electric conductor 17a and short-circuiting device 17b.
Specifically, carry roll coil of strip 8b to move from an end face side near the mode of the electric conductor 17a fixed by supporting arrangement 18.Finally, the lower portion that electric conductor 17a is configured to its コ font runs through the hollow bulb carrying roll coil of strip 8b, and its top partially passes through the top of conveying roll coil of strip 8b.In addition, by supporting arrangement 18, short-circuiting device 17b is moved near the mode of conveying roll coil of strip 8b with the side, other end from conveying roll coil of strip 8b, and make to be connected between itself and each end of electric conductor 17a.By this, solenoid coil 17 can be formed in the mode of the surrounding surrounding the part be configured on the upside of conveying roll coil of strip 8b, thus form closed circuit.
When electric conductor 17a is shorted device 17b short circuit and the inside of heating and thermal insulating container 10 is full of the nitrogen of high temperature rightly, by high-frequency electrical converter 19, using the high-frequency electrical of such as hundreds of [Hz] left and right, excitation is carried out to the solenoid coil 17 as above-mentioned closed circuit.By this, the circumferencial direction (the arrow A direction shown in Fig. 4) of conveying roll coil of strip 8b produces alternating magnetic field, and in conveying roll coil of strip 8b, produce vortex flow conveying roll coil of strip 8b is heated.
When heating conveying roll coil of strip 8b, drive unit drives cradle roll 15, rotates on cradle roll 15 to make conveying roll coil of strip 8b.In addition, because conveying roll coil of strip 8b is carried on a pair cradle roll 15 equably, and be formed with enough gaps between solenoid coil 17 and conveying roll coil of strip 8b, therefore, even if make conveying roll coil of strip 8b rotate on cradle roll 15, conveying roll coil of strip 8b also can not contact with solenoid coil 17.
In addition, in the above-described state conveying roll coil of strip 8b is remained on suitable temperature, thus the crystallization of the easy magnetizing axis with same orientation is grown up selectively in conveying roll coil of strip 8b.
After starting to carry the heating of roll coil of strip 8b, have passed through the stipulated time, when terminating heating and insulation operation (i.e. tropism control operation), make short-circuiting device 17b depart from electric conductor 17a.Then, utilize supporting station 13 that conveying roll coil of strip 8b is carried to coil box 3 from heating and thermal insulating container 10.Once conveying roll coil of strip 8b gets back to the assigned position of coil box 3, then, in coil box 3, uncoiling (uncoiling) mechanism of regulation is utilized to make conveying roll coil of strip 8b uncoiling.Then, rolled base material is supplied to finishing rolling step 5.
In addition, Fig. 5 is the figure of the action for illustration of the induction heating apparatus arranged in the manufacturing operation line of Fig. 1.In Figure 5, symbol 11a is the standby cradle roll and the supporting arrangement that are connected to Handling device 11 by connector 11b.Fig. 5 represents the heating process (Fig. 5 (a)) of conveying roll coil of strip 8b and the state of winding process (Fig. 5 (b)).
The continuous fine milling train 20 be such as made up of four to seven frames is provided with in finishing rolling step 5.In addition, water cooling plant 6 is arranged on the downstream of finishing rolling step 5.The rolled base material supplied from coil box 3 is rolled into desired thickness of slab at short notice by continuous fine milling train 20 quickly.In addition, utilize water cooling plant 6 to carry out water-cooled to the rolled base material having carried out finish rolling processing while appropriate controlled cooling model speed, thus the easy magnetizing axis of crystallization can be made to fix.
Reel to by the rolled base material of the suitable cooling of water cooling plant 6 with up-coiler 7, afterwards, by its cold rolling and heat treatment line carrying towards downstream.
If the manufacturing operation line of said structure, then when not making the equipment enlarging in hot rolling production line, the orientation electromagnetic steel plate that iron loss is less can be produced.
Namely, if the induction heating apparatus of said structure 4, owing to can heat conveying roll coil of strip 8b when keeping cylindric, and remain on the temperature being suitable for tropism control, therefore, tropism control operation can be carried out after the rolling scheme of roughing operation 2 terminates completely.Therefore, will the easy magnetizing axis of the crystallization having carried out tropism control in tropism control operation rightly be made again towards any direction displacement because of roughing processing afterwards as in the past, and make the orientation electromagnetic steel plate producing iron loss less become possibility.
In addition, if the induction heating apparatus of said structure 4, owing to can heat conveying roll coil of strip 8b when keeping cylindric, therefore, even if increase the length of steel billet 8a when extracting out from heating furnace 1, do not need to make heating and thermal insulating container 10 become large yet.Therefore, induction heating apparatus 4 can be made under the prerequisite of productivity ratio not affecting hot rolling production line miniaturized.
In the existing intermediate heating furnace 25 (induction heating apparatus) shown in Figure 10, solenoid coil 29 configures in the mode of the surrounding surrounding heating and thermal insulating container 28.In said structure, if utilize high-frequency electrical converter 30 pairs of solenoid coils 29 to carry out excitation, then can produce through the magnetic flux in steel billet 24a, table 32, extraneous gas.Because the magnetic resistance in air is comparatively large, therefore, a part for magnetic flux can leak to infinity, or through in other metal of surrounding, and they are heated.Therefore, in existing intermediate heating furnace 25, exist and cannot carry out heating such problem to steel billet 24a efficiently.
In addition, in existing intermediate heating furnace 25, in order to prevent table 25 from being heated by vortex flow, even if table 32 must be had the special substance that the very large steel billet 24a of load capacity also can not bend such intensity formed by the non magnetic and material that heat resistance is high.
And, in existing intermediate heating furnace 25, solenoid coil 29 must be configured in the mode surrounding steel billet 24a surrounding completely, thus also there is the problem needing very large solenoid coil 29 such.
If the induction heating apparatus of said structure 4, just above-mentioned various problem can be solved.
That is, in induction heating apparatus 4, solenoid coil 17 configures in the mode of the surrounding surrounding the part be configured on the upside of conveying roll coil of strip 8b.Therefore, when utilizing high-frequency electrical converter 19 pairs of solenoid coils 17 to carry out excitation, magnetic flux in the upper generation of circumferencial direction (the arrow A direction shown in Fig. 4) of conveying roll coil of strip 8b, thus can form closed magnetic loop by the metal that magnetic resistance is less.That is, if the induction heating apparatus 4 of said structure, can make leakage magnetic flux reduce, thus can heat conveying roll coil of strip 8b efficiently.
In addition, because the major part of magnetic flux is through the inside of conveying roll coil of strip 8b, therefore, even if utilize high-frequency electrical converter 19 pairs of solenoid coils 17 to carry out excitation, in cradle roll 15, also vortex flow is produced hardly.Therefore, cradle roll 15 does not need to be made up of special substance, thus can form induction heating apparatus 4 at an easy rate.
And, owing to will, at the rolled substrates perimeter configuration solenoid coil 17 in tabular as in the past, therefore, solenoid coil 17 also being made to maximize.Even if less solenoid coil 17, also can easily improve resistance to insulating properties.
In the induction heating apparatus 4 of said structure, by cradle roll 15, carry out heating and being incubated while making conveying roll coil of strip 8b rotate.Therefore, can heat conveying roll coil of strip 8b entirety equably, temperature deviation can not be occurred on conveying roll coil of strip 8b.
In addition, in existing intermediate heating furnace 25, steel billet 24a is carried on table 32, and heats under the state making steel billet 24a erect.As mentioned above, because table 32 is made up of special substance, therefore, when heating steel billet 24a, table 32 is also maintained at lower temperature.Therefore, in existing intermediate heating furnace 25, the heat of steel billet 24a can be escaped from the table 32 contacted with steel billet 24a, thus there is the even such problem of steel billet 24a temperature distributing disproportionation in the direction of the width.If do not heat equably steel billet 24a, just appropriate tropism control cannot be implemented.
If the induction heating apparatus of said structure 4, then there will not be such problem.That is, in induction heating apparatus 4, owing to passing through cradle roll 15, carry out heating and being incubated while making conveying roll coil of strip 8b rotate, therefore, no matter carrying on the width of roll coil of strip 8b or length direction (carrying the length direction of bar), Temperature Distribution all can be made identical.
In the present embodiment, to heat conveying roll coil of strip 8b on the supporting station 13 of Handling device 11 and the situation of soaking is illustrated.But this only represents an example, also in the inside of heating and thermal insulating container 10, conveying roll coil of strip 8b can be moved to the fixed station (supporting station) of heating from supporting station 13.In this case, above-mentioned cradle roll 15 is arranged to rotate freely on the fixed station of above-mentioned heating, and can drive by driven device.
Embodiment 2
Fig. 6 is the figure of the major part of the manufacturing operation line of the orientation electromagnetic steel plate representing embodiment of the present invention 2.Fig. 6 represents the inside of heating and thermal insulating container 10.
As in the first embodiment described, in roughing operation 2, the rolled thickness being worked into the conveying bar in the final road of rolling scheme becomes twenties [mm] to forties [mm] left and right.If reeled to conveying bar by coil box 3, then its end 8c (tail end) is configured in the peripheral part (most external) of conveying roll coil of strip 8b.That is, the step corresponding to the thickness of conveying bar is formed with at the peripheral part (position by above-mentioned end 8c) being molded into cylindric conveying roll coil of strip 8b by coil box 3.
In the present embodiment, as shown in Figure 6, the supporting station 13 of Handling device 11 rotatably can be provided with the cradle roll 15 of more than three.Below, as an example, the situation that supporting station 13 is provided with four cradle roll 15a to 15d is described.
The function of cradle roll 15a to 15d itself is identical with embodiment 1.
That is, when supporting station 13 is supported conveying roll coil of strip 8b, cradle roll 15a to 15d forms the part of actual bearer conveying roll coil of strip 8b.Cradle roll 15a to 15d level and being configured in abreast on the upper surface of supporting station 13.In addition, a pair cradle roll 15b and 15c of inner side is configured to identical height, and a pair cradle roll 15a and 15d in outside is configured to phase co-altitude in the position slightly higher than cradle roll 15b and 15c.
As shown in Figure 6, in the Handling device 11 comprising the cradle roll 15a to 15d adopting said structure, it is consistent with each axis of cradle roll 15a to 15d that conveying roll coil of strip 8b is configured to its axis.In addition, be carried on equably on each cradle roll 15a to 15d about carrying roll coil of strip 8b to be configured in the mode between cradle roll 15b and 15c with foot.In addition, when end 8c is configured in top position, cradle roll 15a to 15d all contacts with conveying roll coil of strip 8b.
When heating conveying roll coil of strip 8b, the drive unit arranged in Handling device 11 makes cradle roll 15a to 15d drive (rotation), rotates to make conveying roll coil of strip 8b.Conveying roll coil of strip 8b with axis and cradle roll 15a to 15d axially unanimously and the mode that its outer peripheral face contacts with the outer peripheral face of cradle roll 15a to 15d be carried on cradle roll 15a to 15d.Therefore, by the rotation of cradle roll 15a to 15d, conveying roll coil of strip 8b rotates towards the direction contrary with the direction of rotation of cradle roll 15a to 15d centered by its hollow bulb.
In addition, cradle roll 15a to 15d is configured to move to and the position of carrying roll coil of strip 8b (outer peripheral face) to contact and discontiguous position.When heating conveying roll coil of strip 8b, the mode that drive unit does not contact with cradle roll 15a to 15d with the end 8c being configured at conveying roll coil of strip 8b peripheral part (rolled base material), corresponding to the position of above-mentioned end 8c, cradle roll 15a to 15d is made to leave conveying roll coil of strip 8b.
Fig. 7 is the figure of the function of induction heating apparatus for illustration of embodiment of the present invention 2.As shown in Figure 7, when heating conveying roll coil of strip 8b, drive unit such as by making cradle roll 15a to 15d rotate towards side (being clockwise in the figure 7), thus makes conveying roll coil of strip 8b rotate towards opposite side (being counterclockwise in the figure 7).
Once conveying roll coil of strip 8b rotates and makes end 8c near cradle roll 15a, then arrive the position of cradle roll 15a at end 8c before, drive unit makes cradle roll 15a mobile towards outside (lower side), comes to separate (Fig. 7 (a)) with conveying roll coil of strip 8b.Now, cradle roll 15b to 15d contacts with conveying roll coil of strip 8b, and conveying roll coil of strip 8b is rotated.
After this, when end 8c passes through the position of cradle roll 15a, drive unit makes cradle roll 15a inwards (upper side) movement, to contact with conveying roll coil of strip 8b.By this, the revolving force of cradle roll 15a is just passed to conveying roll coil of strip 8b.
Cradle roll 15b to 15d is also same as described above.
That is, once conveying roll coil of strip 8b rotates and makes end 8c near cradle roll 15b, then, arrive the position of cradle roll 15b at end 8c before, drive unit makes cradle roll 15b move side outwardly, comes to separate (Fig. 7 (b)) with conveying roll coil of strip 8b.Now, cradle roll 15a, 15c, 15d contact with conveying roll coil of strip 8b, and conveying roll coil of strip 8b is rotated.Then, when end 8c passes through the position of cradle roll 15b, drive unit makes cradle roll 15b inwards move, to contact with conveying roll coil of strip 8b.
Fig. 7 (c) represents makes cradle roll 15c move the state of separating with conveying roll coil of strip 8b in side outwardly, and Fig. 7 (d) represents makes cradle roll 15d move the state of separating with conveying roll coil of strip 8b in side outwardly.
Because conveying roll coil of strip 8b has very large weight, therefore, if end 8c such as crosses cradle roll 15a when contacting with cradle roll 15a, then cradle roll 15a, solenoid coil 17, heating and thermal insulating container 10 etc. can bear very large impact.In addition, the peripheral part of conveying roll coil of strip 8b can also be damaged.If the induction heating apparatus of said structure 4, then can reduce the moving up and down of conveying roll coil of strip 8b because end 8c produces, and the spin stabilization of conveying roll coil of strip 8b can be made, thus significantly can reduce the load that induction heating apparatus 4 bears.
Other structure is identical with the structure of embodiment 1.
Claims (9)
1., for the manufacture of a manufacturing operation line for orientation electromagnetic steel plate, it is characterized in that, comprising:
Coil box, between the roughing operation that this coil box is arranged on hot rolling production line and finishing rolling step, is wound into conveying bar the cylindrical shape that central part is hollow; And
Induction heating apparatus, heats when this induction heating apparatus twists in keep cylindric to the conveyer belt shaping by described coil box,
Described induction heating apparatus comprises:
Heating and thermal insulating container, described conveyer belt volume can be housed in inside by this heating and thermal insulating container; And
Handling device, described conveyer belt is twisted in the inside being carried to described heating and thermal insulating container when keeping cylindric from described coil box by this Handling device.
2. the manufacturing operation line of orientation electromagnetic steel plate as claimed in claim 1, is characterized in that,
Described induction heating apparatus comprises:
Solenoid coil, this solenoid coil is configured in the described hollow bulb of the conveying roll coil of strip and the outside of peripheral part along the width of the described conveying roll coil of strip; And
Field element, this field element carries out excitation to described solenoid coil, to involve in row heating to described conveyer belt.
3. the manufacturing operation line of orientation electromagnetic steel plate as claimed in claim 2, is characterized in that,
Described induction heating apparatus comprises the supporting arrangement supported described solenoid coil,
Described solenoid coil comprises:
Electric conductor, it is コ font that this electric conductor forms side-looking, and at a side opening; And
Short-circuiting device, this short-circuiting device is connected between the end of described electric conductor, thus forms continuous print helical form together with described electric conductor,
A side in described electric conductor and described short-circuiting device is supported to and can moves on the width of the described conveying roll coil of strip by described supporting arrangement.
4. the manufacturing operation line of orientation electromagnetic steel plate as claimed any one in claims 1 to 3, is characterized in that,
Described induction heating apparatus comprises:
Supporting station;
Cradle roll, this cradle roll can rotatably be located at described supporting station, and can for described conveying roll coil of strip mounting; And
Drive unit, this drive unit is used for driving described cradle roll,
When involving in row heating to described conveyer belt, described drive unit drives described cradle roll, turns to make described conveyer belt convolution.
5. the manufacturing operation line of orientation electromagnetic steel plate as claimed in claim 4, is characterized in that,
Described supporting station rotatably can be provided with multiple described cradle roll,
When involving in row heating to described conveyer belt, described drive unit drives described cradle roll, turn to make described conveyer belt convolution, and in the mode making the end of the base material of the peripheral part being configured at the described conveying roll coil of strip not contact with described cradle roll, corresponding to the position of described end, described cradle roll is made to leave the described conveying roll coil of strip.
6. the manufacturing operation line of orientation electromagnetic steel plate as claimed any one in claims 1 to 3, is characterized in that,
Described Handling device comprises:
Supporting station, this supporting station moves between described coil box and the inside of described heating and thermal insulating container;
Cradle roll, this cradle roll can rotatably be located at described supporting station, and can for described conveying roll coil of strip mounting; And
Drive unit, this drive unit is used for driving described cradle roll,
When involving in row heating to described conveyer belt, described drive unit drives described cradle roll, turns to make described conveyer belt convolution.
7. the manufacturing operation line of orientation electromagnetic steel plate as claimed any one in claims 1 to 3, is characterized in that,
Described induction heating apparatus comprises atmosphere holding element, and this atmosphere holding element is the atmosphere preventing from forming incrustation scale on the surface of the described conveying roll coil of strip and when involving in row heating to described conveyer belt, the inside of described heating and thermal insulating container is held in regulation.
8. an induction heating apparatus, being that the metal material of the cylindrical shape of hollow heats when keeping cylindric to being wound into central part, it is characterized in that, comprise:
Solenoid coil, this solenoid coil is configured in the hollow bulb of described metal material and the outside of peripheral part along the width of described metal material;
Supporting station;
Cradle roll, this cradle roll can rotatably be located at described supporting station, and can for described metal material mounting;
Drive unit, this drive unit is used for driving described cradle roll; And
Field element, this field element carries out excitation to described solenoid coil, to heat described metal material,
Described supporting station rotatably can be provided with multiple described cradle roll,
When heating described metal material, described drive unit drives described cradle roll, rotate to make described metal material, and in the mode making the end of the described metal material being configured at peripheral part not contact with described cradle roll, corresponding to the position of described end, described cradle roll is made to leave described metal material.
9. induction heating apparatus as claimed in claim 8, is characterized in that,
Described induction heating apparatus comprises supporting arrangement, and this supporting arrangement is supported described solenoid coil,
Described solenoid coil comprises:
Electric conductor, it is コ font that this electric conductor forms side-looking, and at a side opening; And
Short-circuiting device, this short-circuiting device is connected between the end of described electric conductor, thus forms continuous print coiled type together with described electric conductor,
A side in described electric conductor and described short-circuiting device is supported to and can moves on the width of described metal material by described supporting arrangement.
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| JP2011173163A JP5790276B2 (en) | 2011-08-08 | 2011-08-08 | Directional electrical steel sheet production line and induction heating device |
| JP2011-173163 | 2011-08-08 |
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| US10286432B2 (en) | 2013-12-23 | 2019-05-14 | Posco | Continuous casting and rolling apparatus and method |
| KR101614619B1 (en) * | 2014-12-02 | 2016-04-22 | 주식회사 포스코 | Preheating device for cold rolling |
| KR101589913B1 (en) * | 2014-12-10 | 2016-02-01 | 주식회사 포스코 | Heat treating method for advanced high strength steel hot coil and cold rolling method using the same |
| CN104668967B (en) * | 2015-03-17 | 2017-03-08 | 马钢(集团)控股有限公司 | Improve the device of strip steel transverse magnetic performance and apply this device to process the process of strip steel |
| CN104723114B (en) * | 2015-03-17 | 2017-01-18 | 马钢(集团)控股有限公司 | Processing device for improving band steel transverse magnetic performance and technological method for processing band steel applying same |
| CA3038298C (en) | 2016-09-27 | 2023-10-24 | Novelis Inc. | Rotating magnet heat induction |
| US11072843B2 (en) | 2016-09-27 | 2021-07-27 | Novelis Inc. | Systems and methods for non-contact tensioning of a metal strip |
| SE1750017A1 (en) * | 2017-01-11 | 2018-07-03 | Tc Tech Sweden Ab Publ | Method and arrangement for metal hardening |
| CN110280588B (en) * | 2019-07-11 | 2020-10-27 | 嘉兴市金鹭喷织有限公司 | Copper strips rough rolling on crack control limit |
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| CN102921727A (en) | 2013-02-13 |
| JP2013035028A (en) | 2013-02-21 |
| JP5790276B2 (en) | 2015-10-07 |
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