CN1029596C - Method for joining steel plates and apparatus therefor - Google Patents
Method for joining steel plates and apparatus therefor Download PDFInfo
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- CN1029596C CN1029596C CN 91108566 CN91108566A CN1029596C CN 1029596 C CN1029596 C CN 1029596C CN 91108566 CN91108566 CN 91108566 CN 91108566 A CN91108566 A CN 91108566A CN 1029596 C CN1029596 C CN 1029596C
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- steel plate
- sheet billet
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- magnetic pole
- alternating magnetic
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Abstract
This invention rapidly and surely joins sheet bars to each other for continuously hot rolling in a high productivity by a combination of a treatment that the front end portion and the back end portion of these sheet bars are contacted and heated at such a contact region by applying alternating magnetic fields so as to pass in a thickness direction of the sheet bar with a treatment of pushing at least one of these sheet bars.
Description
The present invention relates to the joint method and the engagement device thereof of steel plate, this method and device are specially adapted to the steel plate (sheet billet with the conveying of going ahead of the rest, bloom slab, steel billet or steel bloom etc.) and and then be somebody's turn to do the follow-up steel plate of going ahead of the rest steel plate and being transferred, input butt joint at equipment of hot rolling engages, and the steel plate that will engage is continuously delivered to the occasion of rolling line.
In common hot rolling line, after generally need want rolling steel plate to be heated to design temperature each piece, just can process hot rolled plate through roughing operation, finish rolling operation again with desired thickness.But, in such rolling mode, particularly in the finish rolling process, exist some anxious problems for the treatment of early settlement, as because rolled material is engaging-in bad and be easy to generate the problem of faults such as production line stops, and the problem that reduces greatly of the qualification rate that causes because of the shape defect of the forward and backward end of rolled material.
For the existing trial that is intended to eliminate also further its production capacity of raising of the problems referred to above that exists in the hot rolling line, can be with reference to the rolling technique as disclosed among day disclosure special permission clear 60-244401 of communique or the clear 61-159285.
Disclosed technology all is the input in the finish rolling operation in above-mentioned each communique, with the rear end of rolled material in advance and and then in advance the front end of the follow-up rolled material of rolled material engage, thereby realization is continuously delivered to the finish rolling operation with several～tens rolled materials.According to such milling method, can not produce the problem such as engaging-in bad that is occurred when each block plate flowed to rolling line, can improve production capacity significantly.
Although the technology as day clear 60-244401 of disclosure special permission communique is disclosed is carried out high-frequency heating by the predetermined position that steel plate is engaged, has the advantage that in the relatively shorter time, just can be heated to the junction temperature of setting, but also be heated owing to engage all the other irrelevant zones with steel plate, therefore required energy consumption is sizable, what the technology as the clear 61-159285 of day disclosure special permission communique is disclosed adopted is electrically heated mode, owing to have the occasion of oxidation scurf on the surface of steel plate, contact resistance can cause that electric arc takes place between electrode roller and the steel plate, therefore might lesion electrode.As seen, above-mentioned these technology all can not realize the continuously hot rolling of steel plate very goodly.
In addition, common steel plate engagement device is difficult to be applicable to existing production line owing to can not avoid the maximization of self, and because complex structure exists the inconvenient shortcoming of maintenance.
The present invention puts forward in view of the existing problem of above-mentioned prior art, the object of the present invention is to provide a kind of new joint method and a kind of device that is directly used in this method of enforcement that fracture can not separated in useless energy and bonding part that do not need to consume.
The joint method of hot rolling light plate of the present invention is characterized in that:
At the input of equipment of hot rolling,, the leading section of above-mentioned each steel plate is contacted at least at two end regions of steel plate width direction with rearward end with the rearward end of the steel plate in advance carried with and then in advance during the leading section butt joint joint of steel plate and the follow-up steel plate that is transferred; By by adding processing that the alternating magnetic field that connects the steel plate thickness direction heats this contact area and, steel plate being interconnected to the combination of at least one processing that compresses in this steel plate;
The magnetic pole that is used to apply above-mentioned alternating magnetic field is along the size of steel plate width direction than along the big flat of the size of steel plate length direction, and the aspect ratio of magnetic pole and the relation between the area satisfy following relational expression:
W/L≥0.33+0.38（1/S）-0.05（1/S）
2+0.0024（1/S）
3
W in the formula: the crossfoot of magnetic pole cun (m)
L: the linear foot of magnetic pole cun (m)
S: the area (m of magnetic pole
2).
Joint method according to hot rolling light plate of the present invention is characterized in that: make the lap of magnetic pole and steel plate be limited in each steel plate and engage in the contact length of reservations or engagement amount 0.3 times.
Joint method according to hot rolling light plate of the present invention is characterized in that: heat compressing under the state of steel plate.
Joint method according to hot rolling light plate of the present invention, it is characterized in that: the alternating magnetic field generation coil that uses at least one to have the C core of steel plate being clamped along the thickness direction of steel plate is used for the alternating magnetic field that the contact area to steel plate heats so that add.
Joint method according to hot rolling light plate of the present invention is characterized in that: be in the synchronous electric current of vortex flow that steel plate produces with the alternating magnetic field induction on logical respectively each other by the two edges in the steel plate width direction and heat.
The invention still further relates to a kind of engagement device of steel plate, be configured in the input of equipment of hot rolling, the leading section that is used to make the rearward end of the steel plate of in advance carrying and and then be somebody's turn to do the follow-up steel plate of going ahead of the rest steel plate and being transferred engages; It is characterized in that:
This engagement device by at least two groups be used for clamping up and down the fixed pinch roll of steel plate, at the main chassis that can move along the throughput direction of steel plate between the setting area of this pinch roll, be configured in this main chassis, the slave station car that can move along the width of steel plate advance and retreat and the alternating magnetic field generation coil that fixedly remains on the landscape mode on this slave station car and constitute, said coil has the C core of steel plate being clamped along thickness direction.
Engagement device according to steel plate of the present invention is characterized in that: be provided with the rearward end of steel plate and the leading section of follow-up steel plate clamp, make each steel plate to be positioned at the clamp mechanism of same horizontal plane respectively up and down in advance.
Figure 1 shows that and be applicable to an example implementing rolling equipment of the present invention, in the figure, label 1 is the hot finishing unit, 2 is the steel plate of in advance carrying (hereinafter referred to as the sheet billet of going ahead of the rest) of the input of hot-rolling mill 1,3 for being right after the follow-up steel plate (below be referred to as follow-up sheet billet) of this sheet billet 2 of going ahead of the rest, 4 is transporting thin slab 2,3 and the pinch roll that when it engages, it compressed, 5 alternating magnetic field generation coils for the contact area a of the leading section of the rearward end that is used to heat sheet billet 2 in advance and follow-up sheet billet 3, this alternating magnetic field generation coil 5 is by the 5a unshakable in one's determination that forms magnetic pole E, coil 5b and power supply 5c constitute.6 loop liftexs for the engaging time that is used to absorb sheet billet can omit with this loop liftex 6 of occasion that the conveying of sheet billet is moved simultaneously at above-mentioned alternating magnetic field generation coil 5.
In having the equipment of above-mentioned formation, in the front end of the rearward end of sheet billet 2 in advance and follow-up thin plate slab 3 during in the butt joint contact condition, in case the alternating magnetic field generation coil 5 by the central portion that is arranged on this sheet billet width on contact area a has added alternating magnetic field d, then can respond to the vortex flow e of generation broad ways as shown in Figure 2 in each end of sheet billet 2,3.Each end of sheet billet 2,3 is by being referred to as rotary inductive electric current e below this vortex flow e() the heating that produces of rotation be heated.Particularly at the contact area a of sheet billet, owing to exist contact resistance, the temperature of the contact-making surface of each end can preferentially rise as shown in Figure 3 because of the joule heating that this resistance produces, when therefore under this contact condition, heating up, in each sheet billet 2,3 at least one compressed to the sheet billet that will engage, perhaps under the state that compresses in advance, carry out above-mentioned heating, intensification, can in the extremely short time, efficiently this contact area be adjacent to and be joined together.And,, therefore do not worry at all and can produce electric arc and damage equipment because this coil 5 is contactless.
In the present invention, more advantageously carry out in order to make the above-mentioned thermal bonding that adds, the contact area of sheet billet 2 and follow-up sheet billet 3 preferably comprises the place, two edges of its width at least in advance.
With the contact area a of place, the two edges at least of each sheet billet as go ahead of the rest sheet billet 2 and follow-up sheet billet 3, zone in addition then is designed to the example in slit.Shown in Fig. 4 (a)～(g).
Here why can use the as above sheet billet of the shape shown in Fig. 4 (a)～(g), its reason is, for example engaging, shown in Fig. 5 (a) during the sheet billet of such flat shape, heat in joint reservations each sheet billet, the occasion that compresses, this contact area is shown in Fig. 5 (b), can under the effect of less thrust, enlarge to the central portion of its width the two edges from sheet billet, in finish rolling subsequently, can not separate fracture at this junction surface under the condition of specific engagement amount.
Fig. 6 be expression make flat shape as described above sheet billet when engaging engagement amount and finish rolling in the curve map of the result of the test that concerns between the fracture situation at junction surface.As Fig. 6 obviously shown in like that, if the engagement amount B in the contact area
1Respectively more than 0.1 times, both sides are aggregated in more than 0.2 times with respect to the width B of sheet billet, then in finish rolling subsequently not only the junction surface can not separate fracture because of rolling depressing, and also very favourable to shortening engaging time.
The leading section that above-mentioned Fig. 4 (a) is depicted as the rearward end of sheet billet 2 in advance and follow-up sheet billet 3 is cut into the occasion of the concavity with same curvature.Fig. 4 (b) is the occasions with concavity of different curvature for front end, the rearward end of each sheet billet 2,3.It is flat that Fig. 4 (c) is one, another be the occasion of concavity.Fig. 4 (d) is a convex, and another is a concavity, and the big slightly occasion of curvature of concavity ratio of curvature convex.Though these examples here all are that the steel plate at the place, two edges of sheet billet width is contacted, and make its middle section have the slit,, be applicable to that cutting profile of the present invention is not limited in this.Shown in Fig. 4 (e), (f), the present invention can also be at two edges places and 3 of central portion make the steel plate contact, and the slit is set between contact point.The present invention can also be provided with 4 or 4 above contact points, and the slit is set between contact point, though this does not draw in the drawings.The present invention is can also be as Fig. 4 (g) shown in such, and the central portion of steel plate width direction is cut into rectangular indentation.
Though can use the cutting means as the above-mentioned shape of cutting such as scissors machine, gas cutting and laser cutting,, in the occasion of particularly cutting the concavity with specific curvature, it is particularly advantageous using the drum-type scissors machine with 2 curve cuttves.
According to the present invention, when adding alternating magnetic field, use magnetic pole to add alternating magnetic field than magnetic pole along the big flat magnetic pole of the linear foot of the length direction of sheet billet cun (below be referred to as linear foot cun) along the size of the width of sheet billet (below be referred to as crossfoot cun), particularly, the aspect ratio of this magnetic pole and the relation between the area preferably satisfy following relational expression.
W/L≥0.33+0.38（l/s）-0.05（l/s）
2+0.0024（l/s）
3
W in the formula: the crossfoot of magnetic pole cun (m)
L: the linear foot of magnetic pole cun (m)
S: the area (m of magnetic pole
2)
Here why wish that magnetic pole satisfies above-mentioned condition, its reason is, though in this juncture, the rotary inductive electric current of locating by the two edges of sheet billet width is big more, favourable more to shortening engaging time, still, according to the shape of the magnetic pole that is used for externally-applied magnetic field, except that this rotary inductive electric current e, under magnetic pole, also can produce short circuited inductance electric current e as shown in Figure 7
1In case, this short circuited inductance electric current e
1Become big, before the joint reservations of sheet billet reach the junction temperature of setting, melting phenomenon (y) will take place as shown in Figure 8, this not only can damage junction apparatus, and also can make engaging time much colored because of therefore rotary inductive electric current e diminishes.
According to the present invention, in order to suppress above-mentioned short circuited inductance electric current e
1Generation, preferably use along the crossfoot of sheet billet width and cun add alternating magnetic field than a linear foot cun big magnetic pole E with flat face shape along its length direction.The shape of magnetic pole can also be all shapes in satisfying the scope of above-mentioned condition except that such shown in Fig. 9 (a)～(c).
Figure 10 shows that the result of the test of the relation of the aspect ratio of relevant magnetic pole and area to the influence of sheet billet fusing under the magnetic pole.When sheet billet engages, in order to prevent fully by short circuited inductance electric current e
1The fusing of the sheet billet that causes, the most effectively way is exactly that crossfoot cun W, linear foot cun L, an area S who makes magnetic pole satisfies following relational expression.
W/L≥0.33+0.38（l/s）-0.05（l/s）
2+0.0024（l/s）
3
From avoiding engaging the viewpoint of the excessive heating of reservations, the upper limit of the crossfoot of magnetic pole cun W had better not surpass the width of the sheet billet that will engage, but, as described later, the short circuited inductance electric current that causes at the lap by magnetic pole and sheet billet is as the occasion of problem, must making this lap as much as possible little, the linear foot of magnetic pole cun L, the upper limit of area S can naturally and understandably be calculated according to the higher limit of crossfoot cun W.
According to the present invention, contact area at go ahead of the rest sheet billet 2 and follow-up sheet billet 3 is the occasion that width is at least the place, two edges, if the words that become problem of the short circuited inductance electric current in the joint reservations of sheet billet, as shown in figure 11, preferably the lap t of magnetic pole and sheet billet is limited in the preceding length of contact length K(heating of the joint reservations of sheet billet) or engagement amount B
1In (length after the heating) 0.3 times.
In case it is big that the lap t of magnetic pole and sheet billet becomes, and according to the flat shape and the heating condition of sheet billet, short circuited inductance electric current e as shown in Figure 12 just may be arranged in the joint reservations of sheet billet
2Flow, before the junction temperature that all reaches setting in this zone, local fusing just may take place, this not only can damage equipment, but also may can not get good engagement state.
Figure 13 shows that the lateral edges place at the sheet billet width, the lap t of magnetic pole is with respect to engagement amount B
1Many variations to the result of the test of the influence of the efficiency of heating surface that engages reservations.
In this test, the width of sheet billet is 1000mm, engagement amount B
1(side) is that 2, magnetic pole are of a size of wide 250mm, vertical 300mm for the number of 100mm, magnetic pole E.Under these conditions, make the lap t of magnetic pole E and engagement amount B1 do various variations, carry out heat run, calculate the efficiency of heating surface, obtain in result shown in Figure 13 according to the electric power of investing inductor and the specific temperature rise at junction surface.At this, so-called " efficiency of heating surface " is the degree that electric current concentrates on the junction surface.
Basic mode of heating is to make rotatory current e by engagement amount B1 as shown in figure 14.At this moment, electric current e also flows through permanent portion, so concentrate on the degree at junction surface about about 50%.As shown in figure 13, if magnetic pole E is staggered at the fabric width end direction of steel plate, near the junction surface, the electric current that then flows to the junction surface increases.That is, make magnetic pole be in the direction overlapping with the junction surface, then the efficiency of heating surface is improved., if reach the point that lap t increases, then the efficiency of heating surface sharply disappears.As shown in figure 13, reduce rapidly in 0.3 place's efficiency of heating surface.
According to above-mentioned Figure 13, magnetic pole E is the edge of the width of close sheet billet, and the efficiency of heating surface is good; But, after magnetic pole E and sheet billet are overlapping, in case this lap t surpasses engagement amount B
10.3 times, will produce short circuit current e as shown in Figure 12
2, the efficiency of heating surface will greatly reduce.Therefore according to the present invention, worrying to produce such short circuited inductance electric current e
2Occasion, the lap t of magnetic pole E and sheet billet should not surpass in a side sheet billet the joint reservations contact length K or engage after engagement amount B
10.3 times.
Add alternating magnetic field at needs with a plurality of magnetic poles, thereby need to dispose along the width of sheet billet as shown in Figure 14 the occasion of a plurality of alternating magnetic field generation coils, must adopt to make the rotary inductive electric current that adds the alternating magnetic field generation locate the structure that flows in the two edges of sheet billet width roughly the samely; In the occasion that adopts one group of alternating magnetic field generation coil, in order to prevent to produce the short circuited inductance electric current under magnetic pole, adopting the crossfoot cun magnetic pole than linear foot cun big flat of magnetic pole much less is.
Juncture during for the joint sheet billet, although the multiple choices scheme is arranged, as: will engage the temperature that reservations heat to setting, the juncture that after heating stops, promptly compressing; The juncture that (but not surpassing the temperature that engages the reservations fusion) just compresses when reaching the junction temperature of setting under the situation that continues heat temperature raising; Or the juncture that under the state that compresses sheet billet in advance, heats.But, usually in the temperature of engaging process medium thin slab about 1000-1100 ℃, merely compress, the joint between sheet billet can only carry out a little.Therefore according to the present invention, preferably when compressing sheet billet, heat, can not only shorten engaging time like this, and can also reduce the electrical power of heat temperature raising required input.
According to the present invention, preferably use to have to add the alternating magnetic field that connects the sheet billet thickness direction, the alternating magnetic field generation coil that is suitable for so-called horizontal C core 5a pass-through mode, as shown in Figure 15.
Coil for this horizontal pass-through mode, although can adopt can along thickness direction clamp sheet billet respectively at indivedual separation types that are provided with up and down, or homopolarity horseshoe type alternating magnetic field generation coil, but, alternating magnetic field generation coil with C core 5a, the occasion that when sheet billet moves, heats, move operation is easy, and the location with magnetic pole can advantage easy, that carry out exactly.
All joints for the sheet billet width as the sheet billet that engages reservations, in the occasion of using single alternating magnetic field generation coil, alternating magnetic field generation coil can be moved along the width of sheet billet, make it can add the thermal bonding reservations equably.
As Figure 16 (a) (b) shown in, the width along sheet billet be provided with a plurality of joint reservations add alternating magnetic field the time, as long as alternating magnetic field generation coil is set in corresponding with it part.
Though add alternating magnetic field according to the size of the sheet billet that will engage different and difference to some extent, preferably its input electric power is roughly about 500～3000kw, heat time heating time is at 2-8 about second.
Thrust during joint is 3～8kgf/mm at surface pressing
2The time enough, heating-up temperature is preferably 1250～1450 ℃,
At random say, Figure 17 shows that the example of the high-frequency heating mode of using the helical tubular coil, it is inequality with the horizontal pass-through mode of use C shape alternating magnetic field generation coil according to the present invention.
Carry out in the occasion of sheet billet joint at the eddy-current heating that uses such helical tubular coil, owing to particularly comprise the length direction of sheet billet towards the regional 1(of coil) when being heated, energy loss is very big; In improve the occasion that frequency heats in order to shorten engaging time, because the rising of the local temperature of sheet billet surf zone, before reaching the junction temperature of setting, the sheet billet of top layer part just might melting.
According to the present invention, as mentioned above, when making sheet billet tight mutually, though it is favourable that the alternating magnetic field generation coil that uses at least one to have the C core of sheet billet being clamped at its thickness direction comes the contact area to sheet billet to heat, but, particularly under the relatively thinner situation of the thickness of the lip-deep oxidation scurf of sheet billet, in order further to shorten engaging time, can also be by heating at the synchronous electric current of rotary inductive electric current that leads to respectively between each sheet billet junction surface with alternating magnetic field induction generation.
Figure 18 shows that the example that between the junction surface of each sheet billet, is provided with electrode 7a, 7b.In the front end of the rearward end of sheet billet 2 in advance and follow-up sheet billet 3 during in the butt joint contact condition, in case on contact area a, added the words that connect the alternating magnetic field d of sheet billet thickness direction by alternating magnetic field generation coil, then at sheet billet 2, will there be rotary inductive electric current e as shown in Figure 19 to flow in each end of 3 along the sheet billet width, and between electrode 7a～7a, also have respectively between 7b～7b with the synchronous electric current I of rotary inductive electric current e and flow, existing the contact area a of contact resistance, the Joule heat that is produced by this electricity group preferentially rises the temperature of contact site as shown in Figure 3.Under this contact condition, carry out in the heat temperature raising, in each sheet billet 2,3 at least one compressed to the sheet billet that will engage, perhaps under the state that compresses in advance, carry out above-mentioned heat temperature raising, can in the extremely short time, efficiently sheet billet be bonded with each other.Though in above-mentioned Figure 18, Figure 19, the flat shape of the joint reservations of shown sheet billet is a flat, but, the engaging zones of sheet billet is the width occasion at place, two edges at least, not only help shortening heat time heating time, and can also further reduce the electrical power of heating required input.
Below engagement device of the present invention is described.
Engagement device of the present invention, it is characterized in that, this device is at the input of equipment of hot rolling, move simultaneously with the conveying of each sheet billet on the one hand, on the one hand to the rearward end of sheet billet in advance with and then should go ahead of the rest sheet billet and the leading section of the follow-up sheet billet that is transferred heats, compress, it is adjacent to mutually, this device has at least 2 groups and is used for clamping up and down sheet billet and drives the fixed pinch roll that sheet billet is compressed by its rotation, between the setting area of this pinch roll, be provided with the main chassis that can move along the throughput direction of sheet billet, this main chassis is provided with the slave station car that can move along the width of sheet billet, and the alternating magnetic field generation coil that is set with the horizontal pass-through mode with C core of sheet billet being clamped along its thickness direction on the slave station car.In having the device of above-mentioned formation, be provided with near the zone the leading section of near zone the rearward end of the sheet billet of going ahead of the rest and follow-up steel plate is clamped up and down respectively, the clamp mechanism that makes each sheet billet be positioned at same horizontal plane is favourable.
Figure 20 shows that the example of engagement device with above-mentioned formation, number in the figure 8,9 for being used for carrying sheet billet 2 and follow-up sheet billet 3 in advance, and with its pinch roll that compresses mutually, 10 is can be along sheet billet 2, the for example track K that 3 throughput direction is laid goes up the main chassis (drive system omission) that moves, 11 is the slave station car, this slave station car 11 carries on main chassis 10, the track 11a that for example lays along the sheet billet width that can be provided with on main chassis 10 is enterprising to be retired movingly, and has fixedly installed by C core 5a on this slave station car 11, be wound on the alternating magnetic field generation coil 5 that coil 5b on this iron core and power supply 5c constitute.
In having the device of above-mentioned formation, though shown be pinch roll 8,9 for being arranged on 2 groups of fixed examples on the sheet billet pipeline,, can also be that the boundary respectively is provided with 2 groups respectively with the junction surface of sheet billet.And, though shown be that alternating magnetic field generation coil 5 has only 1 example, it is provided with number as required can increase.
Figure 21 has illustrated the engagement device with above-mentioned formation with understanding easily, and is shown in Figure 22 for device of the present invention being applied to the example of the occasion of equipment of hot rolling.In Figure 22, label 12 expressions are used to receive the chest that dress is rolled into the sheet billet of coiled type, 13 for being used for the mip rolls with the sheet billet uncoiling of chest 12, and 14 is the level(l)ing machine that is used to correct the sheet billet of uncoiling, and 15 are the cutter that is used for sheet billet is cut into fixed joint shape.
In equipment of hot rolling, the input of particularly finish rolling group 1, in the time will being joined together from the leading section of the rearward end of the sheet billet 2 in advance of the uncoiling of chest 12 and follow-up sheet billet 3, at first will going ahead of the rest with cutter 15, the front end of the rearward end of sheet billet 2 and follow-up sheet billet 3 for example cuts into flat respectively or such shape shown in above-mentioned Fig. 4 (a)-(g).Cutting in the end, front and back finishes each sheet billet 2,3 of back and is continued to carry according to its sample.In order to keep making the go ahead of the rest rearward end of sheet billet 2 and the contacted state of leading section of follow-up sheet billet 3 by pinch roll 8,9, need the wherein rotation actuating speed of at least one of control; For engagement device, this pinch roll drives moving of sheet billet 2,3, makes the magnetic pole of alternating magnetic field generation coil 5 be positioned at the central authorities of sheet billet width and the contact area of each sheet billet.Keeping the alternating magnetic field that adds perforation sheet billet thickness direction under the situation of this state.As mentioned above, can respond to generation rotary inductive electric current e in the zone that has added alternating magnetic field; In short time before the engagement device body arrives pinch roll 9, utilize the interior heating of this short time can be heated to the junction temperature of setting.
When engaging sheet billet, both can be when having reached the junction temperature of setting by at least one the rotation actuating speed in the control pinch roll 8,9, sheet billet is compressed mutually, also can heat keeping under the state that compresses in advance.
Using such device to carry out the occasion of the joint of sheet billet, sheet billet is engaged and also can shorten engaging time satisfactorily in the place, two edges of width at least.
Because in device of the present invention, between the pinch roll 8,9 that is used for the transporting thin slab, by moving main chassis 10 and slave station car 11 respectively, can make alternating magnetic field generation coil 5 in mobile along with the motion of sheet billet, can also move aptly along the sheet billet width, therefore, this device can not only carry out sheet billet heating and the bonding operation when compressing easy, reliably, and particularly must make engagement device when pipeline is avoided, by after move slave station car 11 and should be able to promptly meet the demands.The structure that device of the present invention has device itself is very simple, compact, maintains easyly, is applicable to the advantage of existing device easily.
Occasion in the pinch roll 8,9 that constitutes engagement device form of fixed position on by the pipeline that is fixed on sheet billet, if it is sizable words at interval, because the distortion that the sheet billet deadweight causes, just might can not get good joint, therefore, at pinch roll 8,9 is the occasion of affixed mode, and it is provided with interval f(with reference to Figure 22) be preferably in about 5～8m.
Even the above-mentioned interval f that is provided with is adjusted in the allowed band, because the conveying situation of operating condition and sheet billet, engaging reservations still might be uneven up and down, so that the horizontal plane of each sheet billet end is inconsistent, therefore, in order to overcome this situation,, the clamp mechanism that each sheet billet end is clamped up and down is set preferably according to the present invention.
Figure 23 (a) and (b) show the structure of clamp mechanism.Number in the figure 16 is a frame, and 17～20 for being fixed on the elevator of the hydraulic means on the frame 16.It is up and down one group clamp mechanism that this elevator 17～20 has constituted from what clamp sheet billet up and down respectively.Be used for fixing the frame 16 of supporting elevator 17～20 and promptly can make with slave station car 11 and be one, also can make such as shown in the figure unpack format.After such clamp mechanism is set,,, also can easily correct this distortion, the horizontal plane of sheet billet when compressing can not changed even the front end of sheet billet, rear end deform because of deadweight by restriction to each sheet billet end.Even in order to make above-mentioned elevator 17～20 will be just also can not become the obstacle that this sheet billet compresses when the sheet billet in course of conveying is being clamped, preferably by for example ball joint such mobile means above-mentioned elevator 17～20 is connected with frame 16.For even this clamp mechanism also can be adapted to this when the size of the steel plate that will engage changes, preferably be provided with and move such position change device along the width of steel plate.
The accompanying drawing drawing is described as follows.
Fig. 1 is the schematic diagram that is applicable to the formation of implementing equipment of the present invention.
Fig. 2 is the key diagram of steel plate connecting state.
Fig. 3 is the schematic diagram of steel plate engaging zones Temperature Distribution.
Fig. 4 (a)～(g) is the schematic diagram of the flat shape of steel plate.
Fig. 5 (a) is the key diagram of the connecting state of steel plate (b).
Fig. 6 is expression B
1/ B and the curve map that the composition of non-cracking is arranged.
Fig. 7 is the key diagram of the situation occurred of short circuited inductance electric current.
Fig. 8 is the schematic diagram of sheet billet melting conditions.
Fig. 9 (a) (b) (c) is the schematic diagram of pole form.
Figure 10 is the curve map of the variation of expression pole dimension, area to the influence of the fusing of steel plate under the magnetic pole.
Figure 11 is the schematic diagram of the lap t of magnetic pole and sheet billet.
Figure 12 is the schematic diagram of the flow condition of short circuited inductance electric current.
Figure 13 is the engagement amount B of expression magnetic pole with respect to sheet billet widthwise edges place one side
1Lap and the curve map of the relation between the efficiency of heating surface.
The schematic diagram of the position relation of Figure 14 amount magnetic pole and sheet billet.
Figure 15 is the ideograph with alternating magnetic field generation coil of C core.
Figure 16 (a) is the schematic diagram of the configuration example of alternating magnetic field generation coil (b).
Figure 17 is the key diagram of common mode of heating.
Figure 18 is with the heating of landscape mode and utilizes the key diagram of the joint method that the heating of energising combines.
Figure 19 is the key diagram that utilizes the heating situation of energising.
Figure 20 (a) is a formation key diagram according to engagement device of the present invention (b).
Figure 21 is the perspective view according to engagement device of the present invention.
Figure 22 is the schematic diagram that engagement device according to the present invention is applied to an example of equipment of hot rolling.
Figure 23 (a) is the schematic diagram that is fit to be arranged on the formation of the clamp mechanism on the engagement device (b).
The following describes and implement best mode of the present invention.
Use as above-mentioned the rolling of 7 tandems (continuously) milling train that have as shown in Figure 1 and install fully, sheet billet (mild steel) with width 100mm, thickness 30mm, shape flat shape as shown in Figure 2, engage according to following condition, and be continuously delivered to milling train, process the hot rolled plate that thickness of slab is 3mm.
A, alternating magnetic field (use has the alternating magnetic field generation coil of C core)
Input electric power: 2000kw
Heat time heating time: 12 seconds
Frequency: 500Hz
B, heating-up temperature: 1400 ℃
C, thrust: surface pressing is 3kgf/cm
2
D, pressing time: 3 seconds
E, juncture: compress after the sheet billet contact heating
F, alternating magnetic field move along the composition surface.
Its result is, do not separate fracture at the junction surface of rolling medium thin slab, can stably be rolled.And, with the identical conditions that adopts common high-frequency heating mode, the joint of the sheet billet of same shape is compared, the electrical power that consumes can reduce about 50%, and, engaging required heat time heating time only is 12 seconds, compares with 15 seconds heat time heating times of the common juncture of the employing of similarity condition, and engaging time can shorten about 20%.
Use and equipment that embodiment 1 is same, with width is that 1000mm, thickness are that the radius of curvature portion of 30mm, leading section, rearward end is 20m, sheet billet (mild steel) with flat shape such shown in above-mentioned Fig. 4 (a), engage according to following condition, and its connecting state is investigated.
A, alternating magnetic field
Input electric power: 2000kw
Frequency: 500Hz
B, heating-up temperature: 1400 ℃
C, thrust: surface pressing is 3kgf/cm
2
The engagement amount 2B that d, heating compress
1=200mm(one side is 100m)
E, juncture: under situation about compressing in advance, heat
Its result is that owing to carried out such joint, fracture can not separated fully in the junction surface in rolling.Engage required time and the leading section of sheet billet, the engaging time when rearward end is flat is compared also and will be shortened, about 2.4 seconds.Also changed the juncture of sheet billet in this embodiment, the occasion that sheet billet compresses after the contact heating is more also investigated, compare with the juncture that when compressing, heats, in this occasion, rise because the temperature on composition surface is difficult, need spend more a little times a little, will prolong about 1.6 seconds heat time heating time (adding up to 4 seconds heat time heating time), can obtain fixed engagement amount.
Use and equipment that embodiment 1 is same, with width is that 1000mm, thickness are that the radius of curvature of leading section, the rearward end of 30mm, sheet billet is 20m all, sheet billet (mild steel) with flat shape such shown in above-mentioned Fig. 4 (a), engage according to following condition, and be continuously delivered to milling train, process the hot rolled plate that thickness of slab is 3mm, and the fracture situation of sheet billet is therebetween investigated.
A, alternating magnetic field
Input electric power: 2000kw
Heat time heating time: 2.4 seconds
Frequency: 500Hz
Number of magnetic poles: 1
The shape of magnetic pole: rectangle
The crossfoot of magnetic pole is very little: 0.48m
The linear foot of magnetic pole is very little: 0.3m
B, heating-up temperature: 1400 ℃
C, thrust: surface pressing is 3kgf/cm
2
D, juncture: the sheet billet contact is heated when compressing.
Its result is, adds the sheet billet of pining under the magnetic pole and do not melt.And in the joint of sheet billet and then rolling, fracture is also separated at the junction surface, can stably be rolled.
In this embodiment, with above-mentioned same condition under, also used oval magnetic pole to carry out the joint of sheet billet, in this occasion, add pine for magnetic pole under do not see the fusing of sheet billet yet, fracture is also separated at the junction surface in rolling.
In this embodiment, be that 1.2m, other size and above-mentioned identical sheet billet heat by the alternating magnetic field that adds along the magnetic pole of its width by 2 also to width, and the melting conditions of sheet billet between the period of heating investigated, add and pine for not seeing fusing under the magnetic pole, and fracture is not separated at the junction surface in rolling yet.
Use and equipment that embodiment 1 is same, with width is that 1000mm, thickness are that the radius of curvature of 30mm, leading section, rearward end is 20m all, sheet billet (mild steel) with flat shape such shown in above-mentioned Fig. 4 (a), engage according to following condition, and be continuously delivered to milling train, process the hot rolled plate that thickness of slab is 3mm.
A, alternating magnetic field
Input electric power: 2000kw
Heat time heating time: 2.4 seconds
Frequency: 500Hz
The shape of magnetic pole and number: use 2 magnetic poles along the rectangular shape of sheet billet width layout
The horizontal stroke of magnetic pole, linear foot cun: 0.25m, 0.3m
B, engagement amount B
1: a side 0.1m
C, from the edge of sheet billet width to the distance of the end of magnetic pole: 0.2m
D, heating-up temperature: 1400 ℃
E, thrust: surface pressing is 3kgf/cm
2
F, engaging force mode: sheet billet is in contact with one another when compressing and heats.
Its result is, pines in adding of sheet billet, do not see fusing engaging reservations, and in being right after thereafter rolling, fracture is not separated at the junction surface.
Next, at the lap t of magnetic pole is 0.3, under other condition and the above-mentioned identical situation, carried out the joint of sheet billet, and the melting conditions that at this moment engages reservations investigated, in this occasion, do not see the fusing that causes because of the short circuited inductance electric current yet, and in subsequently rolling, can obtain good result yet.
In this embodiment, also to when the joint width is 1500mm, other measure-alike sheet billet, engagement amount is 0.2m in a side, melting conditions in the occasion of the lap t=0 of magnetic pole is investigated, in this occasion, do not melt yet, and in subsequently rolling, can obtain good result yet.
Configuration is used to add the electrode of hot thin slab in the equipment identical with embodiment 1, with width is that 1000mm, thickness are 30mm, mild-steel sheet base with flat shape as shown in Figure 2, engage according to following condition, and be continuously delivered to milling train, process the hot rolled plate that thickness of slab is 3mm.
A, heat by adding alternating magnetic field
Input electric power: 2000kw
Heat time heating time: 3.8 seconds
Frequency: 500Hz
B, by heating to electrifying electrodes
Input electric power: 1000kw
Heat time heating time: 3.8 seconds
Frequency: 500Hz
C, heating-up temperature: 1400 ℃
D, thrust: surface pressing is 3kgf/cm
2
E, pressing time: 5 seconds
F, juncture: under situation about compressing in advance, heat.
Its result is, do not separate fracture at the junction surface of rolling medium thin slab, can stably be rolled.And with the identical conditions that adopts common high-frequency heating mode, the joint of the sheet billet of same shape is compared, and the electrical power of consumption can reduce about 25%, and, engage and can shorten about about 1/4 required heat time heating time.Intensity to the junction surface is also investigated, and its result is, the intensity at junction surface and mother metal identical, and do not see the intensity difference of width.
With width is that 1000mm, thickness are that the radius of curvature of 30mm leading section, rearward end is 20m all, mild-steel sheet base with flat shape such shown in above-mentioned Fig. 4 (a), engages according to following condition, and its connecting state is investigated.
A, heat by adding alternating magnetic field
Input electric power: 2000kw
Heat time heating time: 1.9 seconds
Frequency: 500Hz
B, by heating to electrifying electrodes
Input electric power: 1000kw
Frequency: 500Hz
Heat time heating time: 1.9 seconds
C, heating-up temperature: 1400 ℃
Thrust: surface pressing is 3kgf/cm
2
D, the engaging force 2B after heating, compressing
1=200mm(one side 100mm)
E, juncture: under situation about compressing in advance, heat
Its result is that owing to carried out such joint, fracture is not separated at the junction surface in rolling; Compare with the leading section of sheet billet, joint when rearward end is flat, engage and to shorten about 50% required heat time heating time.In this embodiment, also changed juncture, make sheet billet the junction surface be the edge of its width, sheet billet is heated to the occasion that compresses again after the temperature of setting also to be investigated, compare with the mode that when compressing, heats, in this occasion, rise because the temperature on composition surface is difficult, need spend more a little times a little, will prolong heat time heating time just can obtain fixed engagement amount.
In as above-mentioned rolling equipment as shown in Figure 22 with 7 tandems (continuously) finishing mill, configuration is provided with the pinch roll 8,9 that interval f is adjusted into 6m, between it, be provided with along the displacement of sheet billet throughput direction be 5m, according to engagement device of the present invention, be 1000mm with width; Thickness is the sheet billet (mild steel) of 30mm, according to following condition, heats when compressing, engages, and be continuously delivered to milling train, processes the hot rolled plate that thickness of slab is 3mm.
Operating condition (heating condition)
Input electric power: 2000kw
Heat time heating time: 2.4 seconds
Frequency: 500Hz
Thrust: surface pressing is 3kgf/mm
2(pinch roll)
Pressing time: 3 seconds
Finish rolling speed (the input speed of milling train): 60mpm
Result to the investigation of the rolling situation during this shows that the sheet billet that engages is fracture not in rolling, can carry out good rolling.
For the joint of the sheet billet that has particularly used clamp mechanism, the sheet billet at place, junction surface can be not interlaced, can access good joint shape.
The following describes the possibility that the present invention industrially utilizes.
According to the present invention, when the leading section of the rearward end of the steel plate that will in advance carry and follow-up steel plate engages and carries out continuous hot rolling, can access effect as described below.
1. since in advance steel plate and follow-up steel plate can be rapidly, engage reliably, therefore can shorten the dwell time of production line in stopping to transport of steel plate and engage the occasion of operation, can realize the continuous hot rolling that production capacity is higher.
2. for the occasion that when steel plate is carried, engages operation, do not need long equipment.
3. owing to can prevent steel plate in heating, fusing when engaging, the equipment damage that does not therefore cause therefrom can stably engage operation.
Constituting of engagement device of the present invention, input at finishing mill, between 2 groups of fixed pinch rolls, setting can be along the throughput direction of steel plate and the alternating magnetic field generation coil of individually advancing and retreat mobile along the direction vertical with this direction, for this engagement device, can access effect as described below.
1. device is very compact, can easily be applicable in existing the setting
2. owing to the designs simplification of device, can maintain easily
Even 3. because the width dimensions of steel plate changes, alternating magnetic field generation coil also can promptly move, therefore; When steel plate moves, can be rapidly, the upper outside alternating magnetic field that adds in the desired position exactly, thus do not need the unnecessary equipment such as loop liftex of taking time when steel plate engages for absorbing, can simplify production line
4. because when steel plate engaged, each end can clamped mechanism positively be fixed, therefore do not have the uneven joint in end.
Claims (7)
1, a kind of joint method of hot rolling light plate is characterized in that:
At the input of equipment of hot rolling,, the leading section of above-mentioned each steel plate is contacted at least at two end regions of steel plate width direction with rearward end with the rearward end of the steel plate in advance carried with and then in advance during the leading section butt joint joint of steel plate and the follow-up steel plate that is transferred; By by adding processing that the alternating magnetic field that connects the steel plate thickness direction heats this contact area and, steel plate being interconnected to the combination of at least one processing that compresses in this steel plate;
The magnetic pole that is used to apply above-mentioned alternating magnetic field is along the size of steel plate width direction than along the big flat of the size of steel plate length direction, and the aspect ratio of magnetic pole and the relation between the area satisfy following relational expression:
W/L≥0.33+0.38(1/S)-0.05(1/S)
2+0.0024(1/S)
3
W in the formula: the crossfoot of magnetic pole cun (m)
L: the linear foot of magnetic pole cun (m)
S: the area (m of magnetic pole
2).
2, method according to claim 1 is characterized in that: make the lap of magnetic pole and steel plate be limited in each steel plate and engage in the contact length of reservations or engagement amount 0.3 times.
3, method according to claim 1 is characterized in that: heat compressing under the state of steel plate.
4, method according to claim 1 is characterized in that: the alternating magnetic field generation coil that uses at least one to have the C core of steel plate being clamped along the thickness direction of steel plate is used for the alternating magnetic field that the contact area to steel plate heats so that add.
5, method according to claim 1 is characterized in that: be in the synchronous electric current of vortex flow that steel plate produces with the alternating magnetic field induction on logical respectively each other by the two edges in the steel plate width direction and heat.
6, a kind of engagement device of steel plate is configured in the input of equipment of hot rolling, is used to make the rearward end of the steel plate of in advance carrying and and then steel plate and the leading section joint of the follow-up steel plate that is transferred in advance; It is characterized in that:
This engagement device by at least two groups be used for clamping up and down the fixed pinch roll (8,9) of steel plate (2,3), at the main chassis (10) that can move along the throughput direction of steel plate between the setting area of this pinch roll, be configured in this main chassis, the slave station car (11) that can move along the width of steel plate advance and retreat and alternating magnetic field generation coil (5) formation that fixedly remains on the landscape mode on this slave station car, said coil (5) has the C core of steel plate being clamped along thickness direction.
7, device according to claim 6 is characterized in that: be provided with the go ahead of the rest rearward end of steel plate and the leading section of follow-up steel plate are clamped up and down respectively, make each steel plate be positioned at the clamp mechanism (16-20) of same horizontal plane.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP203.997/90 | 1990-08-02 | ||
| JP203.994/90 | 1990-08-02 | ||
| JP2203991A JPH0729123B2 (en) | 1990-08-02 | 1990-08-02 | Joining method of billets in hot rolling |
| JP203.991/90 | 1990-08-02 | ||
| JP77.179/91 | 1991-03-18 | ||
| JP03077180A JP3126745B2 (en) | 1991-03-18 | 1991-03-18 | Method of joining billets in hot rolling |
| JP77.180/91 | 1991-03-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1059489A CN1059489A (en) | 1992-03-18 |
| CN1029596C true CN1029596C (en) | 1995-08-30 |
Family
ID=26418287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91108566 Expired - Fee Related CN1029596C (en) | 1990-08-02 | 1991-08-01 | Method for joining steel plates and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029596C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6184508B1 (en) * | 1993-12-16 | 2001-02-06 | Shigeru Isoyama | Apparatus for joining metal pieces using induction heating |
| AU689053B2 (en) * | 1996-03-04 | 1998-03-19 | Nippon Steel & Sumitomo Metal Corporation | Continuous hot rolling method |
-
1991
- 1991-08-01 CN CN 91108566 patent/CN1029596C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1059489A (en) | 1992-03-18 |
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