CN1311065A - Equipment for prodn. of hot rolled steel plate, and device and method for thickness forging therefor - Google Patents

Abstract

According to an apparatus and a method for manufacturing a hot-rolled steel plate, a roughing process for reducing a thickness of a continuously cast slab is performed to obtain a sheet bar, and a finishing rolling process for rolling the sheet bar is effected to produce a hot-rolled steel plate having a predetermined plate thickness. After cooling down, the hot-rolled steel plate is then wound. A pair of dies 6 each of which has a tapered portion 6b on an input side and a parallel portion 6b on an output side are used in at least part of the roughing process. Further, before performing plate thickness pressing to a material in a plate thickness direction by using the dies 6, at least one of a front end and a rear end of the material is pressed in a widthwise direction to be pre-formed.

Description

The process units of hot rolled steel plate and method and used thickness forging apparatus and method

The present invention relates to process units and the method and the used thickness forging apparatus and method thereof of the hot rolled steel plate that the long chi material to continuous casting steel billet and so on forges and presses on thickness direction.

1. the hot rolling of thin plate such as hot rolled steel plate generally rolls into interior thickness (stocking of this state is called sheet billet) with roughing mill 7 with slab 20, then, rolls into the thickness of final products with finishing mill 3.Here, the size of slab 20 with the size of heating furnace 13 of heating slab 20 as the upper limit.As a result, 1 stove converter molten steel is generally divided into tens slabs 20.In the present invention, as required, slab is called hot slab or is called material simply.

The sheet billet 20A that shuts out from roughing mill 7 is rolling the same with common plank, and the end, front and back produces the shape defect part that is called as tongue and fish tail, though variant on the degree, must produce.Illustrate in passing that so-called " tongue " means that the wide central portion of plate of end is the outstanding shape defect part of tongue shape, so-called " fish tail " means that the wide both ends of plate of end are the outstanding shape defect part of tail shape of fish.The width of any in tongue and the fish tail is narrow than normal part all, so easy deformation.

If keep these shape defect parts, then further be out of shape at finishing mill 3 with next procedure, just become the reason that produces rolling fault, so will cut away the shape defect part in the sheet billet 20A stage.This part of cutting away (hereinafter referred to as " crop ") is long more, and the product lumber recovery reduces more.

Finishing mill 3 generally is the tandem mill that is made of several frames, applies at the steel band to the thickness attenuation under the state of tension force to be rolled.But, the part about the 100m of the first end of the hot rolled steel plate after the finish rolling, before leading section arrives coiling machine 5a, 5b during, under the state that does not have the tension force effect, be rolled.So in addition, in the meantime, leading section is because the come-up that causes with the bump and the blast of conveying roller etc., makes to move unstablely, is rolled generally have to reduce mill speed, until near half of normal condition (behind the arrival coiling machine).

About rearward end, leave finishing mill 3 and final frame after, tension force is zero, so shape defect.Improper part like this since in the course of conveying temperature to reduce and be accompanied by inhomogeneous cooling that shape defect causes even etc., generally its material and shape are but poor than normal part.The rolling fault that these materials and shape bad or crawling of being accompanied by that shape defect causes etc. cause reduces equipment operation rate, therefore, becomes the major reason that lumber recovery reduces.

About improving the lumber recovery of finish rolling, developed the several piece sheet billet has been coupled together the method for carrying out finish rolling.For example, the spy opens flat 4-89109 communique and has proposed following method: successively follow-up sheet billet leading section is bonded on the sheet billet rearward end method of the several piece sheet billet being carried out continuously finish rolling in advance.

In the prior art since also can carry out end, articulate front and back the same with normal condition rolling, so make the lumber recovery raising of above-mentioned end, front and back (improper portion).In addition, leading section also can be rolled with the mill speed identical with normal condition (after arriving coiling machine), so rolling efficiency improves.Since the several piece sheet billet is coupled together rolling, so compare the rolling efficiency raising with the rolling situation of batch (-type).

Different therewith, such method has also been proposed, promptly several piece slab joint or direct rolling of continuous cast plate slab etc. are produced the method for long chi sheet billet.About with the articulate method of several piece slab, the spy opens clear 57-106403 communique and has proposed such method, promptly successively follow-up slab leading section and the slab rearward end of going ahead of the rest are joined together, these articulate several piece slabs are rolled into continuously the method for sheet billet with the planetary rolling mill unit.

The spy opens clear 59-92103 communique and has proposed following method, and the slab that is about to be equivalent to the 1 stove converter steel water yield rolls into sheet billet with depressing milling train greatly, directly is rolled into coiled material, then with the coiled material uncoiling of sheet billet and the method for carrying out finish rolling.Equally, the spy opens clear 59-85305 communique and has proposed following method, is about to the slab with special conticaster (being called rotated mold filing) high-speed casting, by the rolling sheet billet that rolls into, twists in the method for carrying out finish rolling again after batching on the uncoiler.

According to these existing methods, only cut off head and get final product in the end, front and back of long chi sheet billet, do not need every block of slab is carried out crop respectively, so make the corresponding raising of lumber recovery.And, adopt these methods, when finish rolling, also can obtain and above-mentioned several piece sheet billet is coupled together the same effect of method of carrying out finish rolling.

But there is following problem in these prior aries.

At first, the spy opens in the described method of flat 4-89109 communique, for the several piece sheet billet is joined together, must cut off the shape defect part of end, sheet billet front and back.Therefore, because of producing the problem not solution still that crop causes lumber recovery to reduce.And the junction surface of sheet billet is compared with other parts, and intensity is low, might be in the finish rolling process junction surface disrumpent feelings, and the line production of having to stop operation.In addition, the joint of sheet billet is actually with welding method and carries out, so organizing of junction surface is thick, also may becomes bad material or produce the reason of face crack.

The spy opens in the articulate method of the described several piece slab of clear 57-106403 communique, because the slab thickness that engages is thicker, so be difficult to fully engage at short notice.Even can engage at short notice, when with heavy reduction rolling, except the hydrostatic pressing composition, also effect has tensile stress, and the composition surface is peeled off at the junction surface.Therefore, must reduce reduction ratio, roughing efficient is reduced.

The spy opens clear 59-92103 communique, the spy opens in the described direct rolling of continuous cast plate slab method of clear 59-85305 communique, because the restriction of casting speed exists the problem that rolling efficiency is reduced.Casting ability (weight of unit interval) is in fact considered from operating aspect and quality aspect though can to make casting speed according to the latter's communique be 10 mpm, is not seen the report example of this high-speed casting success.

In the direct rolling of continuous cast plate slab method, as these prior aries, because the restriction of casting speed, the mill speed of the starting stage of roughing mill also is controlled at about several m/min sooner.As if the roll rotational speed that this speed is set at milling train, be 1 rpm (1 min ^-1) about, become utmost point low speed rolling.As a result, because the roll of milling train contact with about 1200 ℃ high-temperature material long-time (several seconds), so the problem of existence generation roller surface crackle and distortion or roll banding.Therefore, small-scale situation tentatively do not remember, extensive and with the equipment of high-temperature material as producing hot rolled steel plate as object, be difficult to realize.

The method that sheet billet is rolled into coiled material is applied under the situation of general SPHC factory, and the coiled material of these sheet billets is estimated to be equivalent to several product coiled sheets, becomes the huge coiled material of nearly 100 t.As a result, make taking-up equipment gigantisms such as devices for taking-up inevitably, consider it also is problem from the viewpoints such as occupation of land of equipment cost, factory.

2. on hot rolled strip production line (hot strip mill) and continuous casting direct sending rolled steel strip production line, between heating furnace or conticaster and roughing mill, be arranged on the thickness forging device that on the thickness direction slab is forged and pressed, utilize this thickness forging device that hot slab is carried out thickness forging, till reaching the target thickness size, then carry out roughing, finish rolling.This thickness forging apparatus and method are for example opened in clear 61-238401 communique and the flat 2-274305 communique of Te Kai the spy and are disclosed.

The spy opens in the thickness forging of clear 61-238401 communique, carries out thickness forging because slab is carried out side direction again after rolling, is difficult for producing the advantage of width rise so have the slab of side direction after rolling when thickness forging.But, when carrying out this thickness forging, how the front and back end of material is carried out side direction depresses and do special provision.Use such thickness forging device, if slab is carried out from the leading section to the rearward end simply side direction rolling after, forge and press from thickness direction again, then shown in Fig. 1 (b), slab leading section and rearward end are deformed into horn-like, so must they be cut away in later process, lumber recovery is reduced.In addition, in the former thickness forging, even it is rolling to have carried out side direction before thickness forging, if the reduction ratio height during thickness forging, no matter it is rolling then whether to carry out side direction, normal portion all produces wide variety behind the thickness forging.And rolling no matter whether this thickness forging carries out side direction, the lengthwise section of front end corner part produces overlapping (2 overlapping) or the bulging shown in Fig. 1 (c).

Though the thickness forging of Te Kaiping 2-274305 communique carries out carrying out thickness forging after side direction is depressed forging and pressing to slab, to depress speed much lower than rolling for the speed of depressing of side direction forging and pressing, thickness forging, so the temperature drop of slab is big, impracticable.

In addition, existing hot slab thickness forging method is shown in Fig. 2 (a)～Fig. 2 (d), when on thickness direction, forging and pressing with metal pattern 6, send slab 20 to certain feed f, carry out thickness forging with 6 pairs of further parts of metal pattern again, send slab to certain feed f then, carry out such action repeatedly.The forging and pressing machined surface of metal pattern 6 is made of parallel portion 6a and rake 6b, generally is 1 section inclination.Using tiltangle mostly is the metal pattern 6 of 10 °～15 ° (tiltangle is generally 12 °).When with the forging press with such metal pattern 6 slab 20 being carried out thickness forging, shown in Fig. 2 (b), slab 20 produces advancing slip and back cunning that extends out to the place ahead and the rear of length direction in the forging and pressing process.Produced so advancing slip and back sliding slab shown in Fig. 1 (b), produced flaring wide cut, caused corrugated width distribution because of interrupted processing in normal part in improper part.

In the existing thickness forging method such tendency is arranged, even tiltangle is little, and then the broadening amount is big, and it is also big to load.Width distribution dW in this case (=W '-W) little.The inclination angle is increased, can suppress broadening, suppress load and increase, but produce problem that width distribution increases and, the problem that material production is slided during forging and pressing according to the forging and pressing condition.

In addition, also have such device,, disperse the device that is out of shape even, thickness is carried out attenuate by being divided into several stages with tandem thickness forging machine with several metal patterns, but device complexity and cost height.

Also have, when now slab thickness being carried out attenuate, slab is passed through between the roll of horizontal mill, depress with roll.But the attenuate amount of depressing once with roll is little, thus several horizontal mills are set, or adopt the reversible milling method that on a horizontal mill, moves back and forth.But, adopt this method, equipment scale is big, it is big that area is set, and the temperature drop of slab is also big in the operation of rolling, therefore, developed with forging press with thickness quickly the thickness of attenuate depress forging press.But when carrying out bigger attenuate, the volume of being depressed can also must carry out width and be shaped to the width broadening of slab quickly.

The spy opens clear 61-235002 communique and has disclosed such device, promptly in the downstream that thickness is depressed forging press home roll is set, carries out the device that width is shaped.Fig. 3 is the figure of basic comprising of this device of expression, is provided with thickness and depresses forging press 21 and edging mill 22, and wherein thickness is depressed forging press and with hydraulic cylinder 21b metal pattern 21a depressed, and this metal pattern clips slab 20 and disposes up and down; This edging mill is configured in the downstream that thickness is depressed forging press 21, and band bulge loop roll 22a arranged perpendicular at the width two ends of slab 20, is depressed band bulge loop roll 22a on width.In the downstream of this edging mill 22 common milling train 23 is set.Constitute according to such equipment, with thickness depress forging press to slab 20 depress, attenuate, revise the broadening of widths then with edging mill 22.Depress on width by edging mill 22, the width end portion thickness produces the dog bone shape of protuberance, so revise with 23 pairs of these dog bone shapes of the milling train that is configured in edging mill 22 downstreams.

Be provided with thickness and depress in the equipment of hot rolling of forging press, because the drafts of forging press is bigger than the drafts of milling train, material is depressed along with thickness and is flowed to the four directions of metal pattern so slab etc. are formed.Particularly the width end is noticeable, compares with rolling, forms bigger waveform shape.If be rolled with the milling train unit that is located at the downstream in this state, the then further broadening of this wave-like, so now as described in the above-mentioned communique, the downstream configuration of depressing forging press at thickness is revised the waveform shape of width end by the edging mill that home roll constitutes.But, depress the drafts of forging press when big when thickness, the waveform shape that the width end produces is also big, even improve the ability of edging mill, oversteps the extreme limit on the function and becomes the state that can not fully revise.

3. hot rolled steel plate is normally produced by method such as rolling by hot slab.In recent years, developed such technology,, used the metal pattern on the material inlet side direction, have rake, the technology that hot slab is forged and pressed promptly for hot slab.As an example, the technology that forges and presses from thickness direction like that just like the thickness forging machine.

Fig. 4 represents that hot slab forges and presses the side view of the part of employed common metal mould.Metal pattern by clip hot slab, the pair of metal mould of configuration constitutes up and down respectively, for for simplicity, Fig. 4 has only represented the metal pattern of a side.

The side of metal pattern 6 is main machined surface, and this main machined surface is by constituting with the lower part: the parallel portion 6a parallel with the material feeding direction; At the rake 6b of entrance side with respect to the direction of advance inclination of material; Transitional region 6c between parallel portion 6a and the rake 6b.Here, above-mentioned rake 6b is generally 10 degree～15 degree with respect to the tilt angle theta of above-mentioned parallel portion 6a.

Below, describe for method with reference to Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) with such metal pattern forging and pressing hot slab.This method is the direction that makes metal pattern and length of material direction (direction of advance) perpendicular, be that the gap of the thickness direction of material periodically changes and method that material is forged and pressed.

At first, shown in Fig. 5 (a), with metal pattern 6 be configured in the perpendicular direction of the direction of advance of hot slab 20 on after, hot slab 20 is sent into metal pattern 6 one sides (before the n time forging and pressing).Then, shown in Fig. 5 (b), forge and press (in the n time forging and pressing) with 6 pairs of hot slabs 20 of metal pattern.Then, shown in Fig. 5 (c), metal pattern 6 is left after the hot slab 20, send hot slab 20 to ormal weight [before (n+1) inferior forging and pressing].Among Fig. 5 (b), the thickness of the hot slab 20 before H represents to forge and press, the thickness of the hot slab 20 after h represents to forge and press.

In addition, except method shown in Figure 5, also have such method, promptly as quick type (flying type), material is also moved continuously in the longitudinal direction in the forging and pressing process, in order to reduce the relative velocity with material, also to have metal pattern is moved in the longitudinal direction.

But, in the above-mentioned forging method, often when forging and pressing, produce and slide, bring operational problem.That is, when like that the state before forging and pressing forges and presses shown in Fig. 6 (A), shown in Fig. 6 (B), produce that hot slab 20 is not depressed and the phenomenon that retreats.Produce when sliding,,, operating efficiency is reduced so have to increase the forging and pressing number of times because hot slab 20 does not have feed in accordance with regulations to process.In addition, because the vestige of residual slip is gone up on hot slab 20 surfaces, so also become the reason that product surface quality is reduced.

In fact open flat 5-5201 communique and disclosed this forging and pressing metal pattern, promptly with the metal pattern surface of slab contacts side surfaces on be processed with groove or projection, hole etc., coefficient of friction is increased, suppress slip.But when adopting this design, have following problems: the processing charges of metal pattern is big, and when groove was worn, metal pattern can not use, the replacing frequency height of metal pattern.And, because the groove or the projection of metal surface be replicated on the material surface, so particularly when thickness direction forges and presses, the problem of existence is the reason that easily becomes the generation defective.

Te Kaiping 9-122706 communique has disclosed the slip detecting method of sizing press, and this sizing press is to slide according to the feed detection of forging and pressing load and conveying roller, producing the feed of revising material when sliding, to reach the feed of regulation.But, under the situation that adopts this invention, when on thickness direction, forging and pressing, have the problem that inevitably material surface is had some damages.

Existing thickness forging method is shown in Fig. 5 (a), Fig. 5 (b), Fig. 5 (c), when sending hot slab 20 to, the gap of metal pattern 6 direction vertical with length of material direction (direction of advance) (being the thickness direction of material) is periodically changed, thickness from the thickness forging of hot slab 20 to finished product.Also such just like quick type method, promptly hot slab 20 moves in forging and pressing in the longitudinal direction continuously, in order to reduce the relative velocity with hot slab 20, also has metal pattern 6 to move in the longitudinal direction.When forging and pressing with 6 pairs of hot slabs 20 of metal pattern, shown in Fig. 5 (b), hot slab 20 extends out to length direction upstream extremity one side (metal pattern entrance side) and downstream one side (metal pattern outlet side) respectively.The elongation of the material of two auspicious portions is called back sliding amount RW and advancing slip amount FW.

In existing method,,,, make the coefficient of friction reduction between metal pattern 6 and the hot slab 20 and load is reduced the whole metal pattern of lubricant supply from rake 6b to parallel portion 6a in order to reduce load and to make distortion evenly about sizing press.

But, in the existing method, produce between metal pattern 6 and the hot slab 20 and slide, can not forge and press material effectively.In addition, if reduce coefficient of friction, also can produce advancing slip amount and reduce, the forging and pressing number of times increases and problem that production efficiency is reduced.

Adopt said method, the thickness deformation that also can carry out on the whole width of material is the thickness forging of the heavy reduction more than 0.5, but excessive load acts on the calender during thickness forging.For example, for being that 250 mm (or 256 mm) forge and press to thickness with the mild steel slab from thickness is the situation of 100 mm, the inventor has carried out tentative calculation, and according to The trial result, the load of unit width (1 mm) (width load) is about 5 tons excessive loads and acts on the calender.This value is converted into width when being the hot calender slab of 1 m, produces about 5000 tons load, very large load acts on the forging and pressing calender.When using under this excessive loads effect, the failure frequency of forging and pressing calender raises, and shorten its service life.

1. the present invention is developed in order to solve above-mentioned various problem.That is, the 1st purpose of the present invention is to provide a kind of joint that does not carry out sheet billet and slab, utilizes the production method and the process units of the hot rolled steel plate of the thickness forging device that can produce long chi sheet billet.

In order to reach above-mentioned the 1st purpose, the process units of the hot rolled steel plate that utilizes the thickness forging device of technical scheme 1 of the present invention disposes in the following order: will be processed into the roughing equipment of sheet billet with the hot slab attenuate of castings such as continuous casting installation for casting; The sheet billet that obtains with this roughing equipment is rolled, rolls into the mm finishing mill unit of the hot rolled strip of specific thickness; The coiling machine that this hot rolled strip is batched, this hot rolled steel plate process units is characterised in that: above-mentioned roughing equipment has the forging and pressing organisation of working, this roughing equipment is as at least a portion of attenuate organisation of working, metal pattern with the par of using a pair of rake that possesses entrance side and outlet side, this hot rolled steel plate process units also has side pressure mechanism, and this side pressure mechanism is located at the upstream of above-mentioned attenuate forging and pressing organisation of working.

The production method of the hot rolled steel plate that utilizes the thickness forging device of technical scheme 2 of the present invention is that the thickness behind the continuous casting is carried out roughing and finish rolling processing for the slab of H, the method of batching after the cooling, wherein rough machined effect is that the continuous casting steel billet attenuate is processed into sheet billet, the effect of finish rolling processing is that sheet billet is rolled, roll into the hot rolled strip of specific thickness, this production method of hot milling steel plate is characterised in that: above-mentioned rough machined at least a portion comprises thickness forging processing, the metal pattern of the par of a pair of rake with entrance side and outlet side is used in the processing of this thickness forging, thickness direction reduction ratio r is more than 30%, in this thickness forging first being processed material is carried out side pressure, its drafts is greater than the lateral pressure amount with the following formula decision.

Side pressure drafts=fn (r, H)

The present invention carries out the forging and pressing of thickness direction to continuous casting steel billet, replaces the rolling of roughing leading portion.Consider that from internal flaw incidences such as casting flaws thickness direction reduction ratio r in this case is set at below 0.3.

In addition, the mould of pair of metal up and down 6 with the parallel portion 6a of rake 6b shown in Figure 4, that have entrance side and outlet side carries out thickness forging processing, and establishing rake 6b at the entrance side of metal pattern 6 is in order not make material surface produce step because of the end of metal pattern 6.The reduction ratio r of the material that contacts with the rake 6b of metal pattern entrance side from zero (r=0) of the noncontact portion that changes to continuously more than 0.3 of parallel portion 6a, therefore, can prevent to cause the face crack equivalent damage because of producing step.

But material, is distributed with on the thickness direction of material and depresses distortion during attenuate by thickness forging processing.As the width central portion of plane deformation state, its distribution of depressing distortion is big, and is also producing plate end distortion, under the plane deformation state on the width, and its distribution of depressing distortion is little.Therefore, if be out of shape the effect of improving that the maximum that distributes is estimated internal soundness to depress, it is little that the internal soundness of plate end is improved effect.

Therefore, carrying out side direction in the thickness forging first being processed depresses, make the formation of plate end be called the thickness protuberance of dog bone shape, and after being increased, the plate end portion thickness carries out thickness forging processing, like this, the distortion of depressing of plate end is increased, can obtain to improve effect with the equal internal soundness of plate central portion.

The production method of the hot rolled steel plate that utilizes the thickness forging device of technical scheme 3 of the present invention, it is characterized in that, with a pair of metal pattern that has rake, has parallel portion at outlet side at entrance side, continuous casting steel billet is added man-hour carrying out thickness forging with the reduction ratio more than 30% on the thickness direction, contact length L on the length direction of slab leading section and above-mentioned metal pattern parallel portion is set in 0.2～0.4 times of scope of entrance side thickness of slab, slab after the processing of this thickness forging is carried out roughing continuously, then carry out finish rolling and become hot rolled steel plate.

Among the present invention, continuous casting steel billet is carried out the forging and pressing of thickness direction, replace the rolling of roughing leading portion.Consider from the incidence of internal flaws such as casting flaw, the reduction ratio of this thickness forging is set at more than 30%.Therefore, be more than 30% by making reduction ratio, the internal flaw incidence can be controlled at below 0.01%.

But, it is also the same with the rolling processing of roll that thickness forging adds man-hour, in the end of material, particularly at leading section, thickness central portion specific surface, bottom surface more outstanding (producing bulging 28) perhaps is absorbed in into and makes the outside of end overlap (overlapping 27).Bian Xing part must be cut off, remove as crop in the sheet billet stage after roughing like this.Particularly shown in Figure 16 (a), the leading section of hot slab 20 overlaps at 27 o'clock, becomes the reason that two plates occur, so it must be removed fully.

The present inventor concentrates on studies to the distortion of hot slab leading section, finds that the deformational behavior of leading section changes according to the thickness forging processing conditions is different.At first, the tendency of globality shows, under metal pattern rake 6b and situation that the slab leading section contacts, the incidence height of shown in Figure 16 (a) overlapping 27, under metal pattern parallel portion 6a and situation that the slab leading section contacts, shown in Figure 16 (c), often overlap 27 and 28 two kinds of phenomenons of bulging.

In addition, the result that the present inventor concentrates on studies shows, no matter overlapping 27 size (length of slab length direction), the still size of bulging 28, can put in order with the length L of slab leading section shown in Figure 15, that contact with metal pattern parallel portion 6a (below be referred to as " contact length L ").That is to say that as shown in figure 17, the zone short at contact length L easily overlaps 27, along with the increase of contact length L, it produces frequency and size reduces.In contrast, bulging 28 is along with the increase of contact length L, and it produces frequency and size increases.Therefore, suitably set contact length L, can with overlapping 27 and the generation frequency of bulging 28 be controlled at reduced levels.And, can control the size (length on the roll line direction) of these improper crushed elements less.

The result that the present inventor concentrates on studies shows that the distortion of slab leading section is also depended on the thickness H of hot slab 20 to a great extent except depending on contact length L.The present inventor is according to these opinions, finished the inventive method of size that can infer the distortion (overlapping 27 and bulging 28) of slab leading section with contact length L and thickness H.

Its result as shown in figure 17.Among Figure 17, abscissa is represented the ratio L/H of contact length and thickness, and ordinate is represented overlap length L1 and bulging length L 2, and this figure is expression contact length L and the thickness H characteristic line chart to the investigation result of the influence of overlapping length L 1 and bulging length L 2.Among the figure, white triangle represents to overlap 27, and white square represents to produce bulging 28.Curve E among the figure represents to conclude with least square method the characteristic line in the multiple zone of bulging 28, and curve F represents to conclude with least square method the characteristic line in overlapping 27 multiple zone.

As Figure 17 clearly shown in, if the ratio L/H of contact length L and thickness H reduces, then overlapping 27 size L1 lengthening, otherwise if ratio L/H increases, then the size L2 of bulging 28 extends.At zone line, overlap 27 or bulging 28, this may be the reason owing to the Temperature Distribution fluctuation of material.

According to Figure 17, obtain that the scope that frequency reduces takes place for both at this zone line overlapping 27 and bulging 28, ratio L/H is the scope more than 0.2, below 0.4.According to this point, in production method of the present invention, the thickness forging processing of control slab leading section makes ratio L/H in 0.2～0.4 scope.

Ratio L/H is zero situation, promptly the leading section of slab 20 do not contact with metal pattern parallel portion 6a and with situation that rake 6b contacts under, overlapping 27 generation frequency height.When practical operation, when the slab leading section contacted with the rake of metal pattern, also rolling to add nipping of man-hour bad the same with roll, and hot slab 20 produces and slides, and can not successfully forge and press operation, so do not wish to occur this situation.Therefore, consider that from operating characteristics as the inventive method L/H is set in 0.2～0.4 scope, this can obtain ideal results.

In the present invention, but owing to use the distortion of forging and pressing condition control panel base leading section, so begin to obtain good shape from roughing.Generally, great changes have taken place for the difference that the shape of rolling back slab leading section distributes because of board briquette, is in the bight of slab under the situation of superheat state, overlap 27, in contrast, under the situation that the surface temperature of slab reduces, it is inevitable producing bulging.So, in the present invention, be in the bight of slab 20 under the situation of superheat state, set contact length L longer, to suppress overlapping 27 generation, and can control overlapping dimension L1 littler, in addition, under the situation that the surface temperature of slab 20 has reduced, set contact length L short, with the generation of inhibition bulging 28, and can control this bulging size L2 littler.

The production method of hot milling steel plate that utilizes the thickness forging device of technical scheme 4 of the present invention, it is characterized in that, metal pattern with the par of a pair of rake with entrance side and outlet side is forging and pressing processing with the reduction ratio more than 0.5 to the slab that continuous casting comes out on the thickness direction, make at this moment forging and pressing processing conditions in the scope that all satisfies following inequality, following inequality is with the rake and the material contact length L in the longitudinal direction of above-mentioned metal pattern, feed f, width of plate slab W before the processing, volume V with the processing of the parallel portion of metal pattern, outlet side thickness h and depress deformation epsilon and represent, slab after the forging and pressing processing is carried out roughing continuously, then carry out finish rolling and become hot rolled steel plate.

εL/W＜A????????(1)

Vε/(Wfh)＜B????(2)

In the formula, A, B are constants.

This invention is forged and pressed on thickness direction the slab that continuous casting comes out, and replaces the rolling of roughing leading portion.Reduction ratio is in this case considered and is made as more than 0.5 from the incidence of internal flaws such as casting flaw.As hereinafter described, in order to obtain high quality, the incidence of internal flaw preferably is made as 0.001%.In the present invention, by reduction ratio is made as more than 0.5, the incidence of internal flaw can be controlled at below 0.001%.

In addition, forge and press processing with the metal pattern of the par of a pair of rake with entrance side and outlet side, establishing rake at the entrance side of metal pattern is in order not produce step on material because of the end of metal pattern.The reduction ratio of the part that contacts with the rake of metal pattern entrance side from zero of the noncontact portion that changes to continuously more than 0.5 of par, therefore, can prevent to cause the face crack equivalent damage because of producing step.

Yet, owing to add trade union the width of material is increased, so wish to control its recruitment as far as possible by forging and pressing.The main cause that influences the width recruitment has been carried out with keen determination research, the result found out the contacted part of rake of material and metal pattern aspect ratio, be that the contact length L of length direction is big with the influence of the ratio L/W of width W (processing preceding value).As can be known described by the back, the recruitment of width can be put in order with the product of depressing deformation epsilon than L/W with this substantially.As a result, for the recruitment with width is controlled in the setting, should value ε L/W be made as that certain value A is following to get final product.This is formulated, shown in above-mentioned (1) formula.

When alongst seeing width, the discovery basis is different with the metal pattern position contacting, and width has some changes.Investigated the principal element that influences this width variation, found relevant with the machining status of metal pattern par.By the result as can be known, the change of width is deformed into direct ratio with the distortion of depressing that is only produced by the par with whole depressing.

The machining deformation that is produced by the par only can be estimated with the ratio of the thickness h after the processing capacity of the part by par processing and the processing.This processing capacity is used by likening to mean value of the volume V of the part of par processing and its area and is represented.Because the area of the part by par processing is the product of width W and feed f, so the processing capacity of the part of processing by the par is expressed as V/ (Wf).

Like this, only the machining deformation that is produced by the par is V/ (Wf)/h or V/ (Wfh).As can be known described by the back, the variation of width can and be depressed the product V ε of deformation epsilon/(Wfh) put in order with this ratio V/ (Wfh) substantially.As a result, for the variation with width is controlled in the setting, should value V ε/(Wfh) be made as that certain value B is following to get final product.This is formulated, shown in above-mentioned (3) formula.

2. the 2nd purpose of the present invention provides such thickness forging apparatus and method, the end produced tubaeform before and after promptly (1) can prevent effectively, can prevent normal portion width distribution, can prevent overlapping (2 overlapping) of material front end corner part effectively, (2) even when with high drafts material being forged and pressed, also width distribution can be controlled in the Min., the load in the time of can suppressing to forge and press increases, (3) depress bigger forging and pressing even carry out thickness, also can revise the width of slab width.

When the slab 20 shown in Fig. 1 (a) is carried out thickness forging, owing to depressing and process intermittently in one section one section ground, so shown in Fig. 1 (b), end 20a is deformed into tubaeform respectively before and after the slab.And the width central portion of the lengthwise section of slab leading section produces bulging or overlapping (2 overlapping) according to forging and pressing condition difference shown in Fig. 1 (c).By adjusting the forging and pressing condition, can prevent the generation of these distortion to a certain extent, but the bight of front and back end shown in the figure on Fig. 1 (c) right side, also becomes overlap condition no matter be which type of forging and pressing condition, must cut off, remove in the back operation.

So the present inventor has carried out research with keen determination to the distortion genesis mechanism of improper portion, the result has finished following the present invention.

Promptly, in order to reach second purpose, the thickness forging method of technical scheme 5 of the present invention, for roughly rectangular material, the metal pattern of the main machined surface that constitutes with the rake and the connected parallel portion that have at least by entrance side is before carrying out thickness forging to above-mentioned roughly rectangular material on the thickness direction, at first on width, above-mentioned roughly rectangular material is depressed and adjusted width, the feature of this thickness forging method is, the leading section of above-mentioned roughly rectangular material and at least one side among the rearward end are carried out preform.

According to technical scheme 6 of the present invention, in this case, with following formula non-certain width variation delta W and the non-certain-length Δ L that produces by at least one side among thickness forging, material leading section and the rearward end predicted, according to this prediction, the leading section of rectangular material is roughly carried out preform get final product.

ΔWH=f1(W,ε,Ldt),ΔWT=f2(W,ε,Ldt)

ΔLH=g1(W,h,Ldt),ΔLT=g2(W,H,Ldt)

Symbol in the formula is expressed as follows respectively: Δ WH: by thickness forging, and the non-certain width variable quantity of the prediction that produces on the leading section of rectangle material direction of advance; Δ WT: by thickness forging, the non-certain width variable quantity of the prediction that on the rearward end of rectangle material direction of advance, produces; Δ LH: by thickness forging, the non-certain-length of the prediction that on the leading section of rectangle material direction of advance, produces; Δ LT: by thickness forging, the non-certain-length of the prediction that on the rearward end of rectangle material direction of advance, produces; H: at the thickness of the roughly rectangular material that forges and presses entrance side; H: at the thickness of the roughly rectangular material that forges and presses outlet side; ε [=log (H/h)]: thickness deformation; Ldt: material and the length direction contact length that forges and presses metal pattern; W: the width of roughly rectangular material.

According to technical scheme 7, also can carry out such preform, promptly carry out the preform of width distribution in the normal portion of rectangular material roughly in advance.

According to technical scheme 8, also can carry out such preform, promptly the normal width distribution amount dW of portion and its spacing dL that produces by thickness forging predicted with following formula, according to this prediction, carry out width distribution in the normal portion of rectangular material roughly.Formula is: and dW=F (V, W, h, f, ε), dL=G (H, h, f), and in the formula, H: the thickness of the roughly rectangular material of forging and pressing entrance side; H: the thickness of the roughly rectangular material of forging and pressing outlet side; ε [=log (H/h)]: thickness deformation; W: the width of rectangular material roughly; F: the feed of the roughly rectangular material during thickness forging; V: the metal pattern parallel portion depress volume.

According to technical scheme 9, also can carry out preform respectively, and can carry out such preform the leading section and the rearward end of above-mentioned roughly rectangular material, promptly carry out the preform of width distribution in the normal part of rectangular material roughly in advance.

According to technical scheme 10, also can with following formula to the non-certain width variation delta W that produces by thickness forging, the leading section and at least one side among the rearward end of rectangular material roughly and non-certain-length Δ L, and width distribution dW and its spacing dL of normal portion predict, according to this prediction, respectively to roughly the leading section and the rearward end of rectangular material are carried out preform, and can carry out such preform, promptly carry out the preform of width distribution in the normal portion of rectangular material roughly.

ΔWH=f1(W,ε,Ldt),ΔWT=f2(W,ε,Ldt)

ΔLH=g1(W,h,Ldt),ΔLT=g2(W,H,Ldt)

dW=F(V,W,h,f,ε)

dL=G(H,h,f)

In the formula, Δ WH: by thickness forging, the non-certain width variable quantity of prediction that produces at the leading section of rectangle material direction of advance; Δ WT: by thickness forging, the non-certain width variable quantity of prediction that produces in the rearward end of rectangle material direction of advance; Δ LH: by thickness forging, the non-certain-length of prediction that produces at the leading section of rectangle material direction of advance; H: at the thickness of the roughly rectangular material that forges and presses entrance side; H: at the thickness of the roughly rectangular material that forges and presses outlet side; ε [=log (H/h)]: thickness deformation; W: the width of rectangular material roughly; F: the feed of the roughly rectangular material during thickness forging; V: the metal pattern parallel portion depress volume; Ldt: roughly rectangular material and forging and pressing metal pattern contact length in the longitudinal direction; H: material inlet side thickness; H: material outlet side thickness.

According to technical scheme 11, technical scheme 12, can carry out above-mentioned width adjustment with the vertical miller of the variable aperture of work in-process, in this case, preferably use the roll of type with holes.

According to technical scheme 13, can in this case, can form thickness and width continuously with carrying out above-mentioned width adjustment with the side direction forging press of thickness forging device tandem configuration.

The thickness forging device of technical solution of the present invention 14 is characterised in that this device comprises following part: have the metal pattern of main machined surface, this main machined surface is with respect to roughly rectangular material, and rake and the connected parallel portion by entrance side constitutes at least; With rectangular material roughly to mechanism that this metal pattern is sent to; On the thickness direction of rectangular material roughly, make above-mentioned metal pattern depress the thickness forging device of driving; The vertical miller of the variable aperture of work in-process, this vertical miller are located at the upstream side that more leans on roll line than thickness forging device.

The thickness forging device of technical solution of the present invention 15 is characterised in that this device comprises with the lower part: have the metal pattern of main machined surface, this main machined surface is for roughly rectangular material, and rake and the connected parallel portion by entrance side constitutes at least; With rectangular material roughly to mechanism that this metal pattern is sent to; On the thickness direction of rectangular material roughly, make above-mentioned metal pattern depress the thickness forging device of driving; Side direction forging press, this device are located at than thickness forging device more by the roll line upstream side, be configured in can with the position of this thickness forging device tandem on.

The thickness forging method of technical scheme 16 of the present invention, be that will be roughly rectangular hot slab limit is sent in the longitudinal direction gradually, the limit to its thickness forge and press, attenuate, the feature of this method is to comprise main manufacturing procedure and secondary process operation, wherein main manufacturing procedure is by having the metal pattern of main machined surface, from forging and pressing the thickness h after preceding thickness H is thinned to forging and pressing, this main machined surface is made of entrance side rake and parallel portion at least with hot slab; The secondary process operation is before above-mentioned main manufacturing procedure, to position and near the position thereof that the transition part with intersection metal pattern, that be positioned at rake and parallel portion with above-mentioned main machined surface will forge and press, carries out the attenuate forging and pressing on thickness direction.

According to technical scheme 17, in above-mentioned secondary process operation, the feed of material is f, sliding amount is under the situation of BW behind material during forging and pressing, be preferably in from forging and pressing on thickness direction with the upstream side position of position one segment distance of transition part forging and pressing, this segment distance is determined by following formula.

(0.9～1.1)×f+(f-BW)×n

In the formula, n is a positive integer.

According to technical scheme 18, in above-mentioned secondary process operation, when the feed of material is under the situation of f, the position of attenuate forging and pressing is the positions that are positioned at from the upstream side of transition part (0.9～1.1) * f distance, and preferably secondary process and main processing are alternately carried out.

According to technical scheme 19, be under the situation of r at the ratio of the drafts of the drafts of secondary process and main processing, preferably the drafts with above-mentioned secondary process is made as more than (H-h) * r (r 〉=0.025).

According to technical scheme 20, be under the situation of r at the ratio of the drafts of the drafts of secondary process and main processing, preferably the drafts from main processing constantly begins to carry out above-mentioned secondary process greater than (H-h) * (1-r).According to technical scheme 21, above-mentioned main processing and secondary process are with same metal pattern, carry out simultaneously.Like this, can reduce metal pattern quantity.

In order to reach above-mentioned the 2nd purpose, in the invention of technical scheme 22, depress forging press by thickness and slab is carried out thickness depress, after thickness is depressed forging press and opened, depress forging press by side direction and carry out side pressure.

Depress forging press by thickness slab is carried out attenuate, depress forging press by side direction then the width of slab is depressed.Because side direction is depressed forging press and can be increased the ability of depressing, so, also can revise even the distortion of the broadening of the waveform of width is big.When not depressing forging press and depress by thickness, make side direction depress the forging press action, like this, the capacity of the power source of two forging press can be made as the capacity that the bigger thickness of capacity is depressed forging press.

The invention of technical scheme 23 comprises following apparatus: slab is carried out the thickness that thickness depresses depress forging press; Be located at that this thickness is depressed the downstream of forging press, side direction that the width of slab is depressed is depressed forging press; Open and make side direction depress the control device of forging press action when thickness is depressed forging press.

At first, with thickness depress forging press to slab depress, attenuate.Depress by this thickness, the slab volume flows to the four directions, produces corrugated broadening distortion on width.Depress forging press with thickness it is depressed, so that its width that becomes linearity and become regulation.Control device makes thickness depress forging press and side direction and depresses forging press and alternately move, and makes the action simultaneously of two forging press, with the capacity of the power source that reduces two forging press.

In the invention of technical scheme 24, the downstream of depressing forging press in above-mentioned side direction is provided with width detector, be used for width of plate slab is detected, above-mentioned width control device is adjusted the aperture that side direction is depressed forging press, so that the detected value of width detector is a setting.

Control device is depressed the aperture of the spacing between the metal pattern of forging press and is set representing side direction, side direction is depressed forging press to be controlled, the detected value of the width of plate slab after depressing according to side direction is constantly revised this setting value, and controls, to reach the regulation width of plate slab.The spacing of the metal pattern after under the width specific pressure of slab will swell a bit.This amount of swelling is according to different variation of width of plate slab before the temperature of slab and material, the slab thickness forging and pressing and reduction in thickness etc., therefore, predict the aperture of the width of plate slab that can reach regulation according to these conditions and width of plate slab detected value, and depress forging press to side direction and give an order.When carrying out this prediction, adopt the control device with study calculation function, this study calculation function is the prediction and the relation of learning up to now of detected value and predicting.

3. the 3rd purpose of the present invention is to provide a kind of like this thickness forging method, this method is: (1) forges and presses the beginning contact-making surface of hot slab and the metal pattern part as transitional region between rake and the parallel portion and parallel portion, like this, need not carry out special metal pattern processing, produce in the time of can avoiding forging and pressing and slide, (2) at thickness forging etc., use has hot slab when forging and pressing of the metal pattern of the main machined surface that is made of entrance side rake and almost parallel portion, can guarantee desirable advancing slip amount FW, the slip generation frequency between metal pattern and the material can be reduced simultaneously, and the load that acts on the forging and pressing calender can be reduced.

For reaching above-mentioned the 3rd purpose, the present invention of technical scheme 25 is the method that above-mentioned hot slab is forged and pressed with the metal pattern with main machined surface, this main machined surface by the rake that tilts with respect to the hot slab direction of advance and to the entrance side direction be connected with this rake, the parallel portion parallel with above-mentioned direction of advance constitute, this hot slab production method is characterised in that, metal pattern and the face that above-mentioned hot slab begins to contact are the transitional region between above-mentioned rake and the parallel portion and the part of above-mentioned parallel portion.

Among the present invention of technical scheme 26, be preferably in and apply lubricant at least with on the contacted contact-making surface of hot slab in the main machined surface of above-mentioned metal pattern.

This is according under the situation that begins to contact from the parallel portion of metal pattern, and in order not only coefficient of friction to be reduced but also do not produce slip, with lubricator to reduce load be very effective by making.Here, lubricant for example is graphite and molybdenum bisuphide, the lubricant that kollags such as graphite and mineral oil (lubricating grease) are mixed, simple mineral wet goods, so long as have the hot lubricant of the effect that makes the coefficient of friction reduction, can no matter any.The position of coating lubricant is coated in getting final product at least with on the face that hot slab contact in the main machined surface of metal pattern as mentioned above, also can the length direction of metal pattern with (or) on the part of width or all coat.In addition,, become the reason that produces defective, so had better not adopt the method that working groove on the metal pattern surface etc. is made the coefficient of friction variation because the metal pattern surface can be replicated on the material.

Coating method as lubricant, for example the coating on the rake of metal pattern is performed such, promptly material is forged and pressed the spacing that metal pattern is strengthened in the back, when making material move (sending to) ormal weight for carrying out next time forging and pressing, with nozzle from of the rake jet lubrication agent of material inlet side direction to metal pattern.Coating to the metal pattern parallel portion then is similarly to apply from the material outlet side direction.Equally, by end jet lubrication agent from the metal pattern width, just can be on the rake of metal pattern, parallel portion two sides with lubricant applying.

In the present invention, owing to extend to inlet, outlet side direction, so the feed of the length of metal pattern parallel portion when forging and pressing through the material of forging and pressing.The present invention from the hot slab front end, through normal portion until the forging and pressing process of rear end, during especially for normal portion, can prevent sliding stop, be effective.

The thickness forging method of technical scheme 27 of the present invention, it is characterized in that, when hot slab being forged and pressed with the metal pattern that has the main machined surface that constitutes by entrance side rake and parallel portion at least, lubricant is only supplied with the parallel portion of metal pattern, and the coefficient of friction between hot slab and the metal pattern is reduced.

When hot slab 20 is carried out thickness forging,, then forge and press number of times and reduce if advancing slip amount FW is big, more effective.This advancing slip amount FW depends on the coefficient of friction between metal pattern 6 and the hot slab 20 to a great extent.In the present invention, because lubricant is only supplied with metal pattern parallel portion 6a, so produce necessary friction on rake 6b, hot slab 20 does not produce slip, and advancing slip amount FW is increased.

Other purpose of the present invention and favourable feature can be understood from the following explanation of reference accompanying drawing.

Fig. 1 (a) is the vertical view of the preceding hot slab of expression forging and pressing, and Fig. 1 (b) is the vertical view of the hot slab summary after the expression forging and pressing, and Fig. 1 (c) is the vertical view that amplifies the hot slab end after expression is forged and pressed.

Fig. 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d) are for illustrating that existing thickness forging method represents the figure of slab and metal pattern.

Fig. 3 is the figure that the existing slab building mortion of expression constitutes.

Fig. 4 is the vertical view that hot slab forges and presses employed common metal mould shape.

Fig. 5 is the figure that represents the forging method of prior art by process sequence, Fig. 5 (a) is the metal pattern of state before the n time forging and pressing of expression and the ideograph of slab, Fig. 5 (b) is the metal pattern of state in the n time forging and pressing of expression and the ideograph of slab, and Fig. 5 (c) is the metal pattern of state before expression (n+1) inferior forging and pressing and the ideograph of slab.

Fig. 6 is that existing forging method produces the key diagram that slides.

Fig. 7 (a) is the sectional drawing of the slab after the n time forging and pressing of expression, and Fig. 7 (b) is the sectional drawing of the slab after the n+1 time forging and pressing of expression.

Fig. 8 is the vertical view of the metal pattern of 2 sections inclinations.

Fig. 9 is the figure with the hot rolled steel plate process units summary of thickness forging device of the embodiment of the invention 1.

Figure 10 is the characteristic line chart of the relation of expression forging and pressing reduction ratio r (%) and internal flaw incidence (%).

Figure 11 is the characteristic line chart that the expression thickness forging adds the relation of depressing distortion [=1n (H/h)] and thickness direction maximum plastic deformation of the material that produces man-hour.

Figure 12 is a performance plot of representing to depress when the width end portion thickness being increased cause thickness forging by side direction is rolling the recruitment result that distortion increases respectively.

Figure 13 is the figure of expression effect of the present invention.

Figure 14 is the figure of summary of production method device therefor of hot rolled steel plate of the used thickness forging press of the expression embodiment of the invention 2.

Figure 15 is the ideograph that defines for the contact length L that metal pattern is contacted with material (slab).

Figure 16 (a) is expression overlaps phenomenon by forging and pressing processing, slab end a ideograph, Figure 16 (b) is the ideograph that expression passes through to forge and press processing, slab end generation bulging phenomenon, and Figure 16 (c) is that expression is processed by forging and pressing, the slab end overlaps simultaneously and the ideograph of bulging phenomenon.

Figure 17 is the characteristic line chart of the relation of the length of the slab leading section that contacts with the parallel portion of metal pattern of expression and leading section shape.

Figure 18 is the figure of definition of the size of the expression part embodiment of the invention 3, that material contacts with metal pattern.

Figure 19 is the figure of definition of the symbol of the wide variety before and after the expression forging and pressing.

Figure 20 is the figure of the relation of expression forging and pressing processing conditions and the wide recruitment of plate.

Figure 21 is the figure of the relation of expression forging and pressing processing conditions and the wide variation of plate.

Figure 22 is the summary pie graph of the embodiment 4 of expression thickness forging production line.

Figure 23 is the summary pie graph of the embodiment 5 of expression thickness forging production line.

Figure 24 is the characteristic line chart that the broadening amount of the improper portion of expression distributes.

Figure 25 is the characteristic line chart that the deformation length of the improper portion of expression distributes.

Figure 26 (a) is the vertical view of the slab leading section before the preform, Figure 26 (b) is the vertical view of the slab leading section behind the preform, Figure 26 (c) is the vertical view that preformed slab leading section is arranged behind the thickness forging, and Figure 26 (d) is the vertical view of the no preformed slab leading section behind the thickness forging.

Figure 27 is the axonometric drawing of expression side pressure roll and hot slab.

Figure 28 is the sectional drawing of the slab end face after expression is carried out under the side pressure with roll.

Figure 29 represents other the side pressure roll and the axonometric drawing of hot slab.

Figure 30 is the sectional drawing of the slab end face after expression is carried out under the side pressure with other roll.

Figure 31 sees the figure that metal pattern is represented from plate width direction.

Figure 32 sees the figure that other metal pattern is represented from plate width direction.

Figure 33 sees the figure that metal pattern is represented from the roll line direction.

Figure 34 is the characteristic line chart of the relation of expression reduction ratio and normal partial width abundance.

Figure 35 (a) is the vertical view of the slab before width is shaped, Figure 35 (b) is the vertical view of the slab after width is shaped, Figure 35 (c) is a vertical view behind the thickness forging, that have the slab of width shaping, and Figure 35 (d) is the vertical view of the slab of width shaping behind the thickness forging, no.

Figure 36 is the characteristic line chart of expression to the result of the width distribution quantitative determination of the hot slab after forging and pressing.

Figure 37 is the amplification mode figure that the contact length for metal pattern that thickness forging is used and material defines.

Figure 38 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 39 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 40 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 41 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 42 is the figure that explanation action effect of the present invention is used.

Figure 43 (a) is the slab in the n time main processing of expression and the figure of metal pattern, slab when Figure 43 (b) is the n time main completion of processing of expression and the figure of metal pattern, Figure 43 (c) is the slab in the n time secondary process of expression and the figure of metal pattern, Figure 43 (d) be the n time secondary process of expression when finishing slab and the figure of metal pattern, Figure 43 (e) is the n+1 time main preceding slab and figure of metal pattern of processing of expression.

Figure 44 is the sectional drawing of the metal pattern used of expression secondary process.

Figure 45 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 46 is the ideograph that the section of the metal pattern (other embodiment) of leading processing and secondary process is simultaneously represented turgidly.

Figure 47 carries out the ideograph that the section of the metal pattern of the main processing usefulness after chamfering or the R processing is represented turgidly to the angle changing unit.

Figure 48 is metal pattern (the A type: sectional drawing two sections gradient types) of expression comparative example.

Figure 49 is the metal pattern (Type B: sectional drawing two sections gradient types) of expression comparative example.

Figure 50 is metal pattern (the C type: sectional drawing three sections gradient types) of expression comparative example.

Figure 51 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 52 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 53 is the characteristic line chart that explanation action effect of the present invention is used.

Figure 54 is the figure that explanation action effect of the present invention is used.

Figure 55 is the pie graph of embodiments of the invention 8.

Figure 56 is the precedence diagram of action of the control device of expression embodiment 8.

Figure 57 is the key diagram of the rake of metal pattern when beginning to contact with material.

Figure 58 is the key diagram of forging method of the present invention.

Figure 59 is the performance plot of the relation of the expression inclination angle of metal pattern and feed and drafts.

Figure 60 is in order the thickness forging method of the embodiment of the invention to be described, to schematically show the summary pie graph of the relation that is rolled material, metal pattern, lubricant supply nozzle.

Figure 61 (a) is relatively and the expression characteristic line chart of the surface pressure distribution when forging and pressing under the occasion (method of comparative example) of the rake supply of lubricant of metal pattern and the unlubricated occasion only, Figure 61 (b) is relatively and the expression characteristic line chart of the surface pressure distribution when forging and pressing under the occasion (the inventive method) of the parallel portion supply of lubricant of metal pattern and the unlubricated occasion only, Figure 61 (c) is relatively and the characteristic line chart of the surface pressure distribution of expression when forging and pressing under the occasion (existing method) of whole supply of lubricant of metal pattern and the unlubricated occasion, and Figure 61 (d) is the figure that schematically shows the section of metal pattern.

Below, with reference to accompanying drawing, desirable embodiment of the present invention is described.

(embodiment 1)

Fig. 9 is the embodiment of the invention 1, with the schematic diagram of the process units of the hot rolled steel plate of thickness forging device.Slab 20 with conticaster 1 continuous casting is heated to the target temperature zone by heater 13, carries out side direction with side-pressing device 9 and depresses rollingly, carries out thickness forging processing in roughing equipment 2, carries out roughing with roughing mill 7 again, becomes sheet billet 20A.The sheet billet 20A of long chi imports finishing mill 3 after adjusting temperature by attemperator 11 and heater 12, and finish rolling becomes steel band to target thickness.Steel band passes through cutter 4, finally batches with coiling machine 5a, 5b.

Side-pressing device 9 is by the pair of right and left edger roll that slab 20 is rolled from width or from width the pair of right and left finishing forging press that slab 20 forges and presses to be constituted.

Roughing equipment 2 comprises having a pair of thickness forging device, attemperator 10 and the roughing mill 7 of metal pattern 6 up and down.The continuous casting steel billet 20 usefulness metal patterns 6 of long chi forge and press on thickness direction, with attemperator 10 in accordance with regulations temperature be incubated, carry out roughing with roughing mill 7 simultaneously.In addition, the forging and pressing of thickness of slab direction processing is that the feed f of edge joint regulation sends hot slab 20, limit discontinuously to and carries out repeatedly.

The abscissa of Figure 10 is for forging and pressing reduction ratios (thickness forging device reduction ratio r) (%), and ordinate is internal flaw incidence (%), and this figure is the characteristic line chart that is illustrated in the result of both relations of investigation under the various conditions.It is the continuous casting steel billet of 100 mm and 200 mm that material adopts thickness.For thickness is the slab of 100 mm, adopts rolling reduction ratio is changed into 10%, 20% the product and the product of as-cast condition respectively.The internal flaw incidence is undertaken by common metal structure inspection (macro-etching method).In the drawings, curve A represents that the thickness of continuous casting state is the result of 100 mm slabs, curve B represents that the thickness of continuous casting state is the result of 200 mm slabs, curve C represents that with reduction ratio 10% rolling thickness be the result of 100 mm slabs, and curve D represents that with reduction ratio 20% rolling thickness be the result of 100 mm slabs.By clearly illustrating that among the figure, any material wherein, when reduction ratio is 30% when above, the internal flaw incidence all is lower than permissible value promptly 0.01%.

The abscissa of Figure 11 be thickness forging add the material that produces man-hour depress distortion [=1n (H/h)], ordinate is the thickness direction maximum plastic deformation, and this figure is the result's of expression relation that both are investigated in the width central portion and the width end of long chi material a characteristic line chart.By clearly illustrating that among the figure, the reduction ratio r of thickness direction forging and pressing processing is 30% o'clock, the thickness central portion be equivalent to reduction ratio 30% depress distortion (about 0.357), the thickness direction maximum distortion is about 0.68, and be to make the width end reach equal thickness direction maximum distortion, must make the distortion of depressing of width end increase about 0.1.

It is that the slab of H carries out the ratio dW/H value that side direction is depressed side direction drafts dW and slab thickness H when rolling that the abscissa of Figure 12 is represented thickness, ordinate is represented the distortion recruitment of width end, this figure be represent respectively to carry out side direction when rolling the width end portion thickness increase, thickness forging adds the performance plot of depressing the amount that distortion increases in man-hour.Among the figure, white circle represents that slab thickness H is the result of 250 mm, and white triangle represents that slab thickness H is the result of 300 mm, and white square represents that slab thickness H is the result of 200 mm.By being clear that among the figure, depressing the distortion recruitment and be directly proportional basically with the side direction drafts.According to the two relation, for the distortion of depressing that makes the width end increases by 0.1, must make the side direction drafts is more than 1/4 of slab thickness H.Both this proportional relations, like this too on the finishing forging press.

In addition, be deformed into for 0.45 (being equivalent to reduction ratio 36%),,, also can carry out to substantially improve the thickness of internal soundness and depress distortion by thickness forging processing even then do not increase side pressure distortion if depress.

Therefore, for thickness direction forging and pressing reduction ratio r (r＞0.3), if represent required side direction drafts, then for example as shown in the formula shown in (3) with simple formula.

The side direction drafts=max[(H/4) * (0.36-r)/0.06,0] ... (3)

Distance till the metal pattern from side-pressing device 9 to the thickness forging device is longer than the length of slab, is not carrying out simultaneously under the situation of side pressure and thickness forging, considers from the temperature drop and productivity ratio two aspects of material, preferably adopts the fast side direction of processing speed to depress rolling.

In addition, carry out at the same time under the situation of side pressure and thickness forging, it is rolling to adopt side direction to depress, and also can adopt finishing forging and pressing processing.

Figure 13 represents side direction amount of rolling (mm) respectively, in the evaluation of the internal soundness defective of the evaluation of the internal soundness defective of the thickness forging of width of plate slab central portion processing reduction ratio (%), width of plate slab central portion, width of plate slab direction end, be by various embodiment of the present invention and comparative example are compared the figure that represents effect of the present invention.For thickness H is the cast panel base excessively of 250 mm, the side direction amount of rolling done various variations and carry out after side direction depresses in 0～70 mm scope, reduction ratio is done various variations and the inner materials defective incidence at each position of material after carrying out thickness forging is investigated in 20%～36% scope.Symbol zero * expression is used in the evaluation of this investigation result in the drawings.Symbol zero expression zero defect, so be qualified, symbol * expression defectiveness is so be underproof.The width central portion and the width end of sample number into spectrum 3,6,7,8 (embodiment) are all qualified.The width central portion and the width end of sample number into spectrum 1 (comparative example) are all defective, and the width end of sample number into spectrum 2,4,5 (comparative example) is all defective.

As mentioned above, according to the present invention, slab behind the continuous casting is carrying out the thickness forging first being processed, the above lateral pressure amount of obtaining with the function f (r, H) of thickness forging reduction ratio r and slab thickness H of amount carries out side pressure, make the plate end to depress deformation ratio plate central portion big, can remedy the poor of maximum depression distortion that plate end and plate central portion cause because of deformation state is different, so can reduce the incidence of internal flaw on the whole width.Like this, the slab that has reduced the internal flaw incidence is forged and pressed processing on thickness direction, then, be rolled continuously and roll into sheet billet, so, can be not sheet billet or slab not be engaged and obtain the sheet billet of long chi.

(embodiment 2)

Figure 14 be the expression embodiment of the invention 2, the figure of the summary of used equipment in the production method with the hot rolled steel plate of thickness forging device.The slab 20 usefulness heaters 13 that conticaster 1 continuous casting goes out are heated to the target temperature zone, through behind the attemperator 19, carry out thickness forging processing in roughing equipment 2, carry out roughing and become sheet billet 20A with roughing mill 7 again.Sheet billet 20A imports finishing mill 3 after adjusting temperature with attemperator 11 and heater 12, and finish rolling becomes steel band to target thickness.Steel band finally batches with coiling machine 5a, 5b through cutter 4 backs.

Roughing equipment 2 comprises having a pair of thickness forging device, attemperator 10 and the roughing mill 7 of metal pattern 6 up and down.The continuous casting steel billet 20 usefulness metal patterns 6 of long chi forge and press on thickness direction, with attemperator 10 temperature insulation in accordance with regulations, carry out roughing with roughing mill 7 simultaneously.In addition, the forging and pressing of thickness direction processing is that limit feed f in accordance with regulations sends hot slab 20, limit discontinuously to and carries out repeatedly.Here, slab feed f decides according to condition described later.

Above-mentioned Figure 10 clearly illustrates that, any material, and when reduction ratio is 30% when above, the internal flaw incidence all is lower than permissible value promptly 0.01%.

Below, with reference to Figure 15, the length (contact length L) of the part that material and metal pattern are in contact with one another defines.

The leading section that with thickness is the slab 20 of H inserts a pair of up and down between the metal pattern 6.At this moment, the feed f of control slab 20 is so that only contact one section contact length L with metal pattern parallel portion 6a from the bight C of slab leading section.The control of this slab feed f is to control by not shown control device.Like this, the contact length L that has only the slab leading section is by metal pattern parallel portion 6a forging and pressing, can suppress overlapping 27 and the generation of bulging 28, and the length L 1 of these improper crushed elements, L2 minimum.

Figure 16 (a) is the overlapping ideograph of expression because of producing on the forging and pressing processing slab end, Figure 16 (b) is expression because of the ideograph of the bulging that produces on the forging and pressing processing slab end, and Figure 16 (c) is expression because of the ideograph of produced simultaneously overlapping and bulging on the forging and pressing processing slab end.Overlap at 27 o'clock, shown in Figure 16 (a), the bight C of slab leading section becomes portion foremost, and when producing bulging 28 and overlap 27 and during bulging 28, shown in Figure 16 (b), Figure 16 (c), the slab leading section does not become slab portion foremost to the expansion of roll line (pass line) the place ahead so the result is bight C.

Here, in order to estimate the section configuration of slab leading section quantitatively, to overlapping 27 and the size of bulging 28 define.At this, under any circumstance, all be to measure as starting point with above-mentioned slab front end corner part C.Overlapping under 27 the situation, measuring length L 1, producing the length L of measuring under the situation of bulging 28 towards the outstanding part in the slab outside 2 towards the inboard overlapping part of slab 20.Overlap 27 and the situation of bulging 28 under, measured length L1 and L2.

The bight C of slab front end is under the situation of superheat state, easily overlaps 27, so set contact length L longer, suppresses overlapping 27 generation, and reduces overlapping dimension L1.In addition, under the situation that the surface temperature of slab has reduced, easily produce bulging 28,, suppress the generation of bulging 28, and reduce this bulging size L2 so set contact length L short.

According to the foregoing description, can reduce crop loss significantly, the product lumber recovery is improved greatly.

Above-mentioned the present invention forges and presses processing by the slab to continuous casting on thickness direction, then be rolled continuously and become sheet billet, like this, sheet billet or slab is not engaged, and just can obtain the sheet billet of long chi.Forge and press and add man-hour, compare, can increase reduction ratio, so can reduce the incidence of internal flaw with rolling.

In addition, add man-hour carrying out thickness forging, suitably set the size of the contact portion of metal pattern and material, just can reduce the shape defect part that the distortion because of the slab leading section produces, so can improve the recovery rate of crop in the follow-up sheet billet stage.

(embodiment 3)

The device of above-mentioned Figure 14 is to utilize the direct sending rolling technique that continuous casting installation for casting and hot-rolled process are directly coupled together, continuous casting goes out to be equivalent to several hot rolled strip roll coil of strip amounts and the maximum slab that is equivalent to the length of the 1 stove converter steel water yield, can carry out direct sending rolling (but, processing beyond a part is rolled) equipment, this device is made of following equipment and is configured by following order, i.e. the continuous casting installation for casting used of continuous casting hot slab; The hot slab attenuate of this continuous casting installation for casting continuous casting is processed into the roughing equipment that sheet billet is used; The sheet billet that this roughing equipment is obtained is rolled, rolls into the mm finishing mill unit of the hot rolled strip of specific thickness; This hot rolled strip is batched the coiling machine of usefulness.

Among Figure 14, symbol 1 is a continuous casting installation for casting, and symbol 2 is a roughing equipment, and symbol 3 is mm finishing mill unit, and symbol 4 is flying shears, and symbol 5a, 5b are coiling machines.Here, the attenuate organisation of working of above-mentioned roughing equipment 2 is made of the pair of metal mould 6 of leading portion and the roughing mill 7 of back segment.The entrance side of metal pattern 6 becomes rake, and outlet side becomes the par, in the stage midway of slab being forged and pressed processing, is processed into skewed.In addition, be provided with attemperator 8 near the outlet side in above-mentioned continuous casting installation for casting 1, between continuous casting installation for casting 1 and roughing equipment 2, be provided with attemperator 19, be provided with attemperator 10 between pair of metal mould 6 in roughing equipment 2 and the roughing mill 7, between roughing equipment 2 and mm finishing mill unit 3, be provided with attemperator 11, and between above-mentioned attemperator 11 and mm finishing mill unit 3, be provided with the plate end that can add hot thin slab and (or) heater 12 of whole plate.

In the continuous casting that constitutes like this, hot rolled strip production equipment unit, the chain cast panel base 20 of long chi is supplied with roughing equipment 2 with the state that does not cut off, parallel portion and rake 6a, 6b with the metal pattern 6 of this roughing equipment 2 forge and press processing, be thinned to sheet billet thickness (on thickness direction, forging and pressing processing), be rolled continuously with roughing mill 7 then and roll into sheet billet, then the product thickness of slab that is rolled into regulation with mm finishing mill unit 3 forms and is hot rolled strip 25.The forging and pressing processing of thickness direction is that carry out repeatedly on feed mobile material (continuous casting steel billet 20), limit in accordance with regulations, limit.The feed of regulation is according to conditional decision described later.Then, above-mentioned hot rolled strip 25 batches with coiling machine 5a earlier, batches the batching length of regulation and during as the product roll coil of strip, cuts off steel band 25 in mobile with flying shear 4, and the steel band 25 usefulness coiling machine 5b of this cut-out portion back batch.This coiling machine 5b also batches the batching length of regulation and during as the product roll coil of strip, cuts off steel bands 25 with flying shear 4, with above-mentioned the same, the coiling machine that batches steel band 25 is switched to coiling machine 5a from coiling machine 5b.

As shown in figure 10, thickness is any material in the continuous casting steel billet of 100 mm and 200 mm, and when reduction ratio was 0.3, the internal flaw incidence was essentially allowed band 0.01%.In the present invention, in order to ensure higher quality, the internal flaw incidence is made as 0.001% of 1 of decline.

Figure 18 is the figure of the dimension definitions of expression material and metal pattern contact portion.Contact length L represents the contacted part of the rake 6b length in the longitudinal direction of slab and metal pattern 6.Feed f is about to forge and press the preceding amount of movement of processing.In the processing of slab 20 part in the slope, this feed f part forges and presses processing by the parallel portion 6a of metal pattern 6.The figure bend represents that partly its volume is V with the finished part in par.H represents to forge and press the thickness after the processing.

Figure 19 (A), Figure 19 (B) are the figure of the wide variety before and after the explanation forging and pressing, the state before Figure 19 (A) expression forging and pressing processing, the state after Figure 19 (B) expression forging and pressing.Among Figure 19, the width of plate slab before W represents to forge and press, the width between the slab paddy portion after W1 represents to forge and press, W ' expression forging and pressing are the width between slab peak portion afterwards, and dW represents that W ' and W1's is poor.

Figure 20 shows that the relation of forging and pressing processing conditions and width of plate slab recruitment.Abscissa is represented the contact length L of length direction and the ratio and the long-pending ε L/W that depresses deformation epsilon of width W, and ordinate is represented width recruitment (the width W 1-W after the forging and pressing processing).Any point among Figure 20 is all in the zone below skew lines.As can be seen from Figure 20, by make the width recruitment in target range necessity forging and pressing processing conditions.For example, if the desired value of the wide recruitment of plate is made as below 100 mm, then ε L/W is less than 0.3, if desired value is made as in 150 mm, then ε L/W gets final product below 0.5.

Relation for forging and pressing processing conditions and wide variety amount shown in Figure 21.Abscissa only represents that V ε/(Wfh), ordinate is represented the variable quantity dW of width with deformation epsilon under the processing capacity V/ (Wfh) of par processing and the stagnation pressure long-pending.Among the figure, any point all is positioned at the following zone of skew lines.As can be seen from Figure 21, by make the wide variety amount in target range necessity forging and pressing processing conditions.For example, if the desired value of wide variety amount is set at below 20 mm, V ε/(Wfh) get final product then less than 0.6.

Foregoing invention can be by forging and pressing processing and continuously continuous casting steel billet be rolled into sheet billet at thickness direction continuous casting steel billet, and like this, the joint that need not carry out sheet billet and slab just can obtain the sheet billet of long chi.In forging and pressing processing, the machining deformation amount can be bigger than rolling, so can reduce the incidence of internal flaw.

In forging and pressing processing, use has the pair of metal mould of the par of the rake of entrance side and outlet side, process on thickness direction according to forging and pressing processing conditions by particular value, just can will the value of material broadening is controlled in the setting along with forging and pressing processing, this particular value be to represent with the size of the contact portion of metal pattern and material and feed etc.

(embodiment 4)

The thickness forging production line of the embodiment 4 that the present invention uses is shown in Figure 22.

On the production line of embodiment 4, vertical miller 34 is configured in the upstream side of the thickness forging device with metal pattern 6.This vertical miller 34 is the equipment that carries out side pressure that hot slab 20 is depressed to W～W ' from initial stage width W 0, it is the pattern that roll gap can change in rolling, though the variable-width mode is that preferably the hydraulic pressure that responsiveness is very high is depressed mode no matter what mode is all right.Compare with the thickness forging machine, it is fast that the side direction that vertical miller 34 carries out is depressed rolling process velocity, carries out thickness forging so depress in side direction again after rolling, just can boost productivity, and, can prevent effectively that also the temperature of slab 20 from descending.In addition, also can carry out side direction simultaneously depresses rolling and thickness forging (tandem).

(embodiment 5)

The thickness forging processing line of the embodiment 5 that the present invention uses is shown in Figure 23.

On the production line of embodiment 5, side direction forging press 35 is configured in the upstream side near the thickness forging machine with metal pattern 6.This side direction forging press 35 is to be used for hot slab 20 is depressed to the equipment that carries out side pressure of W～W ' from initial stage width W 0, is the pattern that the side direction drafts can change in rolling, it be positioned at can with the position of thickness forging machine tandem on.In addition, also can with side direction forging press and thickness forging machine in this order alignment arrangements in same frame.Like this, carry out side direction forging and pressing and thickness forging (tandem) simultaneously, just can boost productivity, but also can prevent effectively that the temperature of slab from descending.

Present inventors are with above-mentioned thickness forging processing line, and the distortion that the slab end is produced during to thickness forging is investigated.Processing conditions is 15～80% at thickness of slab 200～270 mm, the wide 600～2000mm of plate, forging and pressing reduction ratio, the tiltangle of metal pattern rake 6b is to have carried out various variations in 10 °～30 ° the scope.

＜front and back end wide variety 〉

Its result can distinguish that the horn shape of material front and back end can be used following formula (4)～(7) expression.

WH-W=(0.15～0.45)ε×Ldt????……(4)

LH=(0.12～0.18)×W/h×Ldt???……(5)

WT-W=(0.15～0.45)ε×Ldt????……(6)

LT=(0.06～0.3)×W/h×Ldt????……(7)

In the formula symbol H be material inlet side thickness (mm), h be material outlet side thickness (mm), ε for depress distortion (mm), Ldt is that material and forging press metal pattern contact length (mm), W in the longitudinal direction are material width (mm).

Figure 24 is total deformation ε Ldt with the abscissa, be the broadening amount WT-W0 (or WH-W0) of improper portion with ordinate, the result's that to be expression investigate the distribution of the broadening amount (mm) of improper portion characteristic line chart.Black circle is represented the broadening amount WT-W0 (mm) of material leading section, the broadening amount WH-W0 (mm) of white square symbolic representation material rearward end among the figure.From this figure as can be known, broadening amount WT-W0, the WH-W0 of improper portion and the total deformation ε Ldt of material are closely related, and both appear in the folded zone of 2 solid lines among the figure.

Figure 25 as broadening index W Ldt/H, with the deformation length LT (or LH) of ordinate as improper portion, is the result of investigation has been carried out in expression to the distribution of the deformation length (mm) of improper portion characteristic line chart with abscissa.Black circle is represented the deformation length LT (mm) of material leading section, the deformation length LH (mm) of white square symbolic representation material rearward end among the figure.From this figure as can be known deformation length LT, LH and the broadening volume index WLdt/H of improper portion be closely related, both appear in the folded zone of 2 solid lines (dotted line) among the figure.

According to these experiences, inventors find to carry out preform for the end, front and back to hot slab 20, and available above-mentioned (4)～(7) formula determines preform amount and preform length respectively.For example, the width preform amount of establishing front end is LH for (WH-We), preform length, and the width preform amount of establishing the rear end is that LT gets final product for (WT-We), preform length.But We has considered the side direction drafts of front and back end and normal portion and the arbitrary value that determines, is the value that the relation with We＜W1 awards.

Below, with reference to Figure 26 (a)～26 (d) the preform amount of front and back end and the determining method of preform length are illustrated.

At first, hot slab 20 preformations shown in Figure 26 (a) are formed the shape of representing material front end 20a both sides with dotted line among the figure.The changing method of the preform amount that changes to normal portion from the 20d of preform portion of front end preferably as Figure 26 (a) shown in, is configured as the parabolic shape along horn shape, still also it can be pre-formed into linearity.

Then, from thickness direction the preformed slab of process [Figure 26 (b)] is forged and pressed.Pass through the leading section after the preform in advance,, as Figure 26 (c) shown in, become the essentially rectangular shape after finishing just forge and press though produce tubaeformly after the forging and pressing.Yet, shown in Figure 26 (d), become horn shape without preformed leading section.

Determine that above-mentioned preformed order also is the same to the rear end of material.

Illustrate to have the vertical miller with flat-roll 38 34 shown in Figure 27 in passing, then when thickness is forged and pressed, can produce the overlapping phenomenon of end surface shape 20s shown in Figure 28 if use.

Yet, if use the vertical miller 34 of the roll with pass 39a 39 shown in Figure 29, the overlapping phenomenon of the front end width end that is produced during to thickness forging carries out opposite distortion in advance, then to behind the thickness forging, just can obtain roughly level and smooth end face 20s shown in Figure 30.

Under the situation of using the side direction forging press, with the metal pattern 6 of shape or with the metal pattern 6A of shape, thickness is forged and pressed with arc sections 6c shown in Figure 32 with parallel portion 6a shown in Figure 31, just can be with the front and back end preform.And for example shown in Figure 33, the side surface part 6d of metal pattern 6B is set as spill, 6B carries out opposite distortion to the front and back end in advance with this metal pattern, just can prevent the overlapping phenomenon of the front end width end that produced when thickness forging effectively.

＜normal portion width distribution 〉

Figure 34 represents reduction ratio (H-h/H) with abscissa, represents normal portion's width distribution amount (being equivalent to real machine) with ordinate, and this figure is the characteristic line chart that the normal portion width distribution amount after the thickness forging has been carried out investigation.Here, it is 12 ° metal pattern that metal pattern uses the inclination angle, supposes that feed f is 250 mm, and the forging and pressing reduction ratio of the hot slab of thickness 250 mm * wide 1200 mm and the relation of width distribution amount are investigated.Black circle is in order to investigate the rolling influence of side direction, to be illustrated in after the side pressure of having carried out 50 mm among the figure, situation about forging and pressing again from thickness direction, and white circle is to represent not carry out side pressure, only carry out the situation of thickness forging.From figure as can be known, the normal portion width distribution after the forging and pressing has the tendency that increases along with the rising of forging and pressing reduction ratio.

As shown in the figure, side direction is rolling to almost not influence of width distribution, the forging and pressing reduction ratio was greater than 30% o'clock, because the width distribution amount has surpassed allowed band, so will carry out reduction ratio at least is forging and pressing more than 30%, at this moment should control the wide variety of normal portion, need to form width distribution in the normal portion of material by edger roll is rolling.

In addition, inventor's experimental result can distinguish that the width distribution amount dW of normal portion and cycle dL thereof can be expressed as following formula (8) and (9).

DW=V/Whf * ε: width distribution amount ... (8)

DL=B * H/h * f: width distribution is (forging and pressing processing back) at interval ... (9)

In the formula: f be feed, V be the metal pattern parallel portion depress volume, h is a forging press outlet side thickness.

Figure 36 represents V/ (WHf) * ε value, represents width distribution amount dW (mm) with ordinate with abscissa, is the result of investigation has been carried out in expression to both relations characteristic line chart.As shown in the figure, find that both have very strong dependency relation.

Therefore, the forging and pressing of rolling or side direction are pre-formed normal portion with edger roll, so can make forging and pressing normal portion material plane shape afterwards good.For example, forming the normal portion width distribution negative shape that is produced with thickness forging gets final product.At this moment needed aperture variable quantity can be predicted according to the following formula (8) of representing normal portion width distribution and (9) etc.

If use vertical miller 34,,, has the advantage of easy shaping so the roll gap variable quantity reduces because that side direction is depressed efficient is big with concave roll 39.In addition, under the situation of width forging and pressing processing, the metal pattern 6A with having circular-arc contact-making surface 6d shown in Figure 32 can obtain good result.

With reference to Figure 35 (a)～(d) method of the present invention is explained.

At first, hot slab 20 shown in Figure 35 (a) is formed, normal portion is configured as shape shown in the dotted line among the figure.When carrying out this shaping, wide variety is preferably formed as the sinusoidal shape shown in Figure 35 (b), still, also it can be formed zigzag.

Then, the slab [Figure 35 (b)] after being shaped is carried out thickness forging.In the normal portion of material that is shaped in advance, produce width distribution through forging and pressing, the shape behind this width distribution and the preform is cancelled out each other, and shown in Figure 35 (c), hot slab 20 becomes the smooth-shaped of not having width distribution substantially behind the excellent suitability for press forming.Illustrate in passing, do not carry out the preformed slab of width distribution and form the shape shown in Figure 35 (d).

Simultaneously preform is carried out in the material front and back end and the normal portion shape width that distributes is shaped with above-mentioned vertical miller 34, material after forging and pressing finish is formed both do not had the front and back end tubaeform, also do not have a normal portion width distribution shape.

According to the method for the foregoing description, carry out the front and back end preform by side pressure, the front and back end shape after thickness forging is finished is good, lumber recovery is improved.

By side pressure, the width distribution of the normal portion after normal portion forms width distribution, thickness forging is finished reduces, thus can improve the material width precision, and then improve the quality of products.

The auspicious preform in front and back and normal portion width distribution be shaped, and both carry out together, product lumber recovery after just can obtaining to improve thickness forging and finishing and the double effects that improves the quality of products.

Vertical miller uses the edging mill of type with holes, can boost productivity, and carry out the front and back end preform and can prevent that also the front and back end is overlapping, improve lumber recovery, carrying out the width distribution shaping of normal portion makes side direction depress the efficient raising, thereby can simplify the adjustment work of vertical miller, width accuracy is further improved, thereby product quality is improved.

Much less, carry out the rolling or side direction forging and pressing of edger roll, can enlarge the sheet material width range that to make with same slab in the thickness forging first being processed.

According to the present invention, because the raising of the width accuracy of the end, front and back of hot slab, so lumber recovery increases substantially.Because of preventing the overlapping phenomenon of front and back end, cut away the part minimizing so make again, lumber recovery improves.Because the width accuracy of normal portion improves, so product quality improves.

(embodiment 6)

(situation of one section metal pattern)

Present inventors at drafts certain (but, depress be deformed into more than 0.5), use under the following condition of one section metal pattern and carried out simulated test.

Experimental condition

Simulation material: hard lead (the initial stage size: thick H 32 mm * wide W 150 mm * L)

Thickness h after the forging and pressing: 12.5 mm

Feed f:10～40 mm

Metal pattern tiltangle: 12 °～30 ° (based on 12 °, 20 °, 30 °)

The tiltangle of metal pattern greater than 15 ° situation under, contact with hot slab 20 at rake 6b, feed is f, can produce sliding phenomenon when forging and pressing processing beginning, for for reference and on the data note.The result of study of back distinguishes, under metal pattern rake and the contacted situation of material, the inclination angle easily produces sliding phenomenon during greater than 15 °.

The result that analog reslt is discussed has distinguished following (a)～(d) conclusion.

(a) thickness h, the width after the available substantially forging and pressing of back sliding amount BW put in order divided by the total of stagnation pressure lower volume V ',

(b) the volume V that depresses of the basic available metal mould of width distribution parallel portion puts in order,

(c) the contact length ld of the basic available metal mould of broadening amount rake and some feed influence factors are put in order,

(d) the whole contact length ldt of basic available metal mould of the load on the unit width and material puts in order.

With reference to Figure 37 above-mentioned analog reslt is remarked additionally.Figure 37 describes for the metal pattern that thickness forging is used and the contact length between the material, and the amplification mode figure that metal pattern and material are carried out analog representation.The contact length ldt of length direction equals the length (ldt=ld+f) that geometry rake contact length ld adds feed f.Stagnation pressure lower volume V ' equal rake depress the volume of depressing volume V that volume V1 adds parallel portion (V '=V1+V).Depress deflection ε, can obtain [ε=1n (H+h)] with the thickness h after thickness H before the forging and pressing and the forging and pressing.

Figure 38 represents V '/W0h (mm) with abscissa, represents back sliding amount BW (mm) with ordinate, and this figure is the characteristic line chart of expression to the result of both dependency relation investigation.The V ' of abscissa/W0h is the amount that is equivalent to length L 1, and this length is the length when stagnation pressure lower volume V ' is deformed into the cuboid of thick h, wide W0, long L.Result when white circle represents that the inclination angle is 12 ° among the figure, the result when white square represents that the inclination angle is 20 °, the result when white triangle represents that the inclination angle is 30 °.From figure as can be known, back sliding amount BW and V '/W0h are proportional substantially, and back sliding amount BW increases along with the increase of V '/W0h.

Figure 39 represents V/W0 with abscissa, represents width distribution dW with ordinate, is the characteristic line chart of expression to the result of both dependency relation investigation.The parallel portion that the V/W0 value of abscissa is equivalent on the unit width is depressed area.Width distribution dW is equivalent to the difference of Breadth Maximum and minimum widith.Result when white circle represents that the inclination angle is 12 ° among the figure, the result when white square is 20 ° at inclination angle, the result when white triangle is 30 ° at inclination angle.From figure as can be known, width distribution dW and V/W0 are proportional substantially, and width distribution dW increases along with the increase of V/W0.

Figure 40 represents rake contact length ld (mm), represents broadening amount W1-W0 with ordinate with abscissa, is the characteristic line chart of expression to the result of both sides relation investigation.Result when white circle represents that feed f is 10 mm among the figure, the result when white square represents that feed f is 20 mm, the result when white triangle represents that feed f is 30 mm, the result when white rhombus represents that feed f is 40 mm.From figure as can be known, broadening amount (W1-W0) is proportional substantially with rake contact length ld, increases along with the increase of feed f.

Figure 41 represents geometry contact length ldt (mm) with abscissa, with the load (t/mm) on the ordinate representation unit width, is the characteristic line chart of expression to the result of both sides relation investigation.Result when white circle represents that the inclination angle is 12 ° among the figure, the result when white square represents that the inclination angle is 20 °, white triangle represents that the inclination angle is 30.The time the result.As we know from the figure, load on the unit width and geometry contact length ldt are proportional substantially, and the weight of unit width increases along with the increase of ldt.

After the resulting experience conclusion of above-mentioned Figure 38～Figure 41, the influence of tiltangle can be expressed as shown in Figure 42.

Tiltangle is big, and then inclination angle contact length ld and geometry contact length ldt are little, so have lightening the load and reduce the effect of broadening amount, has and can make the corresponding miniaturization of device, light-weighted advantage.Therefore, from load and broadening aspect, wish that tiltangle is big.If the angle of rake 6b is greater than 30 °, sliding amount BW increase behind material during forging and pressing is so tiltangle is preferably in 15 °～30 ° scopes.But after tiltangle increased, parallel portion 6a depressed volume V and can increase, so have the counter productive of width distribution dW increase.For example, certain feed 30 mm, if tiltangle is increased to 20 ° from 12 °, then load is reduced to 2/3, the broadening amount almost reduces half.But width distribution dW in this case is increased to about 3 times.

Equally, when increasing feed f because the broadening amount decides according to rake contact length ld, thus constant substantially, load because of geometry contact length ldt want corresponding increase some, so how much also will increase.Forging and pressing number of times because of material reduces again, therefore, can obtain the effect that makes thickness forging operation high efficiency.But the volume V that depresses of parallel portion increases, so exist the problem that width distribution dW increases.For example, the inclination angle is 12 °, and when feed f increased to 40 mm from 20 mm, the broadening amount increased by 20% approximately, though load only increases about 30%, width distribution dW then increases to 5 times, considerably beyond allowed band.

In order to address these problems, present inventors have carried out labor to the deformational behavior of the width that causes because of thickness forging.With reference to Fig. 7 its result is illustrated.

Distortion during forging and pressing is shown in Fig. 7 (a), and at first, the part broadening amount of depressing with metal pattern rake 6b increases and becomes after the tilted shape, send to length direction, by depressing of back at metal pattern parallel portion 6a place formation width distribution dW.And, also can distinguish the minimum position of width distribution dW, be near the position [the A portion among Fig. 7 (b)] that (transition part 6c and) forges and presses near the boundary with metal pattern rake 6b and parallel portion 6a; The maximum position of width distribution dW is the pars intermedia that parallel portion is depressed.Width distribution dW is debatable to be following condition, promptly because relation such as the metal pattern tiltangle is big or feed f is big makes feed f than the also big condition of rake contact length ld.Therefore, the present inventor has considered especially gently to be depressed as secondary process during leading processing with above-mentioned metal pattern.

Secondary process preferably the A of material portion, promptly as Fig. 7 (b) near the bight of (n+1) inferior main processing metal mould rake 6b and parallel portion 6a that is shown in, carry out in the zone that produces necking down at the width of material, but because this zone below main processing metal mould, is practically impossible so secondary process is carried out in this zone.Therefore, the present inventor has carried out various discussions to following method, and this method is to be worked between the next main processing from utilizing above-mentioned metal pattern to lead, above-mentioned A portion and near position thereof are gently depressed.Inquire into the result and obtained such experience, promptly after the n time completion of processing, before material is sent in the longitudinal direction during in, can in advance the part that will become A portion gently be depressed in that (n+1) is inferior.The drafts of this light drafts when depressing with metal pattern rake and parallel portion is much smaller.Finish this constantly the n time forging and pressing, and B portion is positioned at from A portion and is about on the upstream side position of feed f, and this part can be provided with the metal pattern that secondary process is used.

The result that the position of the secondary process that present inventor's correspondence is gently depressed is further inquired into has in detail obtained following (1), (2) opinion.

(1) if from the distance of A portion in 0.9 f, the distortion that then main processing is produced can make the effect of secondary process disappear.

(2) if from the distance of A portion more than 1.1f, then secondary process does not have effect.

According to above-mentioned (1) and (2) opinion as can be known, the zone that can bring into play the secondary process effect effectively be positioned at leave will become A portion next time distance only on the upstream side position of (0.9～1.1) f.In addition, as present embodiment, under the situation of the 1 section metal pattern that only has a rake, alternately carry out secondary process and main processing.

Measure the position that BW decides secondary process as if back cunning that feed f and forging and pressing according to material add man-hour, also can carry out secondary process at upstream side.At this moment secondary process position is determined by following formula (10).Back sliding amount when BW is for forging and pressing in the formula, n is a positive integer.

(0.9～1.1)×f+(f-BW)×n????……(10)

Under the condition identical with above-mentioned experimental condition, feed f is 30 mm, when the metal pattern tiltangle is 20 °, with assistant metal mould 47 shown in Figure 44, having carried out with following position between main processing and next time main processing is the secondary process at center, and this position is the upstream side of 1.0 * f in the distance from the transition part 6c of metal pattern rake 6b and parallel portion 6a boundary.

Below, with reference to Figure 43 (a)～Figure 43 (e), the thickness forging method that has secondary process is done explanation.

Shown in Figure 43 (a), main metal pattern 6 adds man-hour, 47 standbies of assistant metal mould carrying out the n time master.The n time main completion of processing return original position with main metal pattern 6 shown in Figure 43 (b), then shown in Figure 43 (c), gently depress (secondary process) with the upstream side position of 47 pairs of main working positions of assistant metal mould.In this case, the scope of secondary process is the position that is positioned at the upstream side of being equivalent on the length direction (0.97～1.03) * f.Its drafts is 0.1 mm (r=0.005), 0.5 mm (r=0.025), 1.0 mm (r=0.050).Symbol r is when the drafts with main processing is a reference value 1, the drafts of expression secondary process and the index of the ratio of this a reference value.By this secondary process, on the upstream side position of the top and bottom of slab 20, form scrobicula 48.

After the n time secondary process finishes, shown in Figure 43 (d), assistant metal mould 47 is return original position, and shown in Figure 43 (e), make the slab 20 one section feed f distance of advancing, make secondary process formed recessed 48 relative with the transition part 6c of main metal pattern 6.And, suppress down with 6 pairs of zones that comprise scrobicula 48 of main metal pattern.

Below, with explaining with regard to secondary process by auxiliary/main processing drafts index r.

Figure 45 with abscissa represent from the transition part 6c of in advance forging and pressing and near carried out the distance (mm) at the position of main processing, represent width (mm) with ordinate, this figure is illustrated in auxiliary/main processing drafts index r to have carried out in 0～0.05 scope under the situation of various variations, to both characteristic line charts of result of relational surveys.If the drafts of main processing is 20 mm, makes the drafts of secondary process carry out various variations in 0～1.0 mm scope, investigate like this.Its result as shown in the figure, auxiliary/main processing drafts index r does not have too big effect when being 0.005 (drafts 0.1mm), but when r was 0.025 (drafts 0.5 mm) and 0.05 (drafts 1.0 mm), width distribution dW reduced, and the broadening amount has also reduced some.In addition, between r=0.025 and r=0.05, there is not significant difference.Promptly use the wedge metal mould to carry out same secondary process, also can obtain and same effect shown in Figure 45.

Here, the time started of secondary process is not under the situation of same parts at metal pattern 47 and the main metal pattern 6 of processing usefulness that secondary process is used, though depend on the shape and the feed f of the metal pattern of use, tends to make between the metal pattern be in contact with one another yet.Therefore, had better not begin secondary process man-hour leading to add.But, when using metal pattern 6A shown in Figure 46 to begin to lead processing and secondary process simultaneously,, just can not produce this problem if main processing and secondary process are finished simultaneously.That is, only the moment of the end of (1-r) in main processing drafts (H-h) begins secondary process, makes secondary process and main processing finish simultaneously to get final product.

At this moment employed metal pattern, the mould of leading processing with one section rake adopts metal pattern 6A shown in Figure 46.This metal pattern 6A, but the projection 47A that the secondary process of clutch is used had at the entrance side of rake 6b.That is, when hot slab 20 being led processing, carry out secondary process by projection 47A with parallel portion 6a and rake 6b.But material feed f at this moment is bigger than metal pattern rake contact length ld, and feed f is constant substantially, and this is necessary condition.

In addition, also can use metal pattern 6B shown in Figure 47.Metal pattern 6B is provided with the face 6g that secondary process is used at the entrance side of rake 6b.That is, when with parallel portion 6a and rake 6b hot slab 20 being led processing, 6g gently depresses with the secondary process face.But feed f at this moment is bigger than rake master machined surface 6b's, and feed f is constant substantially, and this is a necessary condition.

On metal pattern 6B shown in Figure 47, form suitable routine angle or form the face 6g that processes through R in the angle changing unit.Viewpoint from the easiness of metal pattern processing preferably has chamfering R.And the secondary process part of metal pattern 6A is preferably big with the chamfering R of the interface branch of main processing part.

By this secondary process, can further enlarge the minimum dwell portion of width distribution, so have the effect that reduces width distribution.Near the A portion shown in Fig. 7 (b) material is depressed because of being difficult to again,, can be obtained the effect that reduces the broadening amount so it is binding that near (n+1) the inferior rake the A portion is depressed the broadening that is produced.

(embodiment 7)

(situation of multistage metal pattern)

Below, with reference to Figure 48～Figure 54 various multistage metal patterns are illustrated.

On the metal pattern of one section inclination, particularly when drafts is big, be difficult to make the restriction condition that suppresses broadening, reduces to load and suppress width distribution two sides all to be set up, so need have the metal pattern of multistage rake.Therefore, the present inventor inquires into the problem that above-mentioned one section metal pattern equally has the secondary process function about making the metal pattern with multistage rake.

Its result, particularly the rake that becomes main machined surface is being set as under the situation of 2 sections (rakes 1,2 that begin from parallel portion one side), and then form the shape of secondary process face (rake 3), tilt angle theta 1, θ 2 (θ 1＜θ 2) generally are in order to shorten contact length, but at this moment the average angle of rake 1～3 preferably is set as more than 15 °.Here, so-called average angle means and is applying under the state of depression amount, the angle that the contacted point of the angle of parallel portion and rake and rake and material surface constitutes.

Length direction contact length L1, L2, L3 about each rake and material, if the rake contact length is long, then can cause load to increase and the broadening increase,, in fact preferably satisfy the relation of following inequality (11) so the contact length L3 of secondary process face is preferably short as far as possible.

L3/(L1+L2+L3)＜0.1????……(11)

If tiltangle 1 is big, tends to when then beginning to contact produce and slide with material.Therefore, 1 one the angle θ 1 of tilting should be less than 15 ° as being not easy to produce the angle of slip.

The machined surface that carried out secondary process is contacted with the rake 1 of main processing next time, and material is not easy to produce and slides.This condition is when the length direction feed of material or metal pattern is f, to satisfy the relation of following formula (12).

(L1+L2)=(0.9～1)×f????(12)

Length according to contact length L3 decides lower limit for a short time.If θ 1 is big with the differential seat angle of θ 3, then can produce sliding phenomenon, so | θ 1-θ 3 | necessary＜5 °.

The present inventor with Figure 48～multistage metal pattern 6M (type A), 6N (type B), 6S (Type C) shown in Figure 50, has carried out simulated test in order to confirm respectively under the following conditions.

Experimental condition

Simulation material: hard lead (the initial stage size: thick H 32 mm * wide W 150 mm * L)

Thickness h after the forging and pressing: 12.5 mm

Feed f:30 mm

Metal pattern tiltangle: be illustrated respectively among Figure 48, Figure 49, Figure 50 and Figure 54

L1, L2, L3: be illustrated respectively among Figure 48, Figure 49, Figure 50 and Figure 54

In addition, the rake contact length ld of type B metal pattern 6N equates substantially with feed f.

Result of the test is shown in Figure 51, Figure 52, Figure 53 (result who also comprises the Type C metal pattern 6S of embodiment).

Figure 51 represents geometry rake contact length (mm), represents minimum broadening amount (mm) with ordinate with abscissa, this figure result's that to be expression investigate with regard to both relations characteristic line chart.Result when white circle represents that the inclination angle is 12 ° among the figure, the result when white square represents that the inclination angle is 20 °, the result when white triangle represents that the inclination angle is 30 °, band net circle is represented the result of particulate metal mould 6S (Type C).

Figure 52 represents to depress volume V, represents width distribution amount (mm) with ordinate with abscissa, this figure result's that to be expression investigate with regard to both relations characteristic line chart.Result when white circle represents that the inclination angle is 12 ° among the figure, the result when white square represents that the inclination angle is 20 °, the result when white triangle represents that the inclination angle is 30 °, band net circle is represented the result of particulate metal mould 6S (Type C).

Figure 53 represents geometry contact length (mm), represents load (t) with ordinate with abscissa, and this figure is the result's that investigates with regard to both relations of expression a characteristic line chart.Result when white circle represents that the inclination angle is 12 ° among the figure, the result when white square represents that the inclination angle is 20 °, the result when white triangle represents that the inclination angle is 30 °, band net circle is represented the result of particulate metal mould 6S (Type C).

Can distinguish from result shown in Figure 51, Figure 52, Figure 53, the metal pattern that the inclination angle is little, the upside inclination angle is big of bottom one side as type A metal pattern 6M and type B metal pattern 6N, make under the situation that contact length ld shortened, because the average tilt angle of metal pattern is greater than 15 °, so have the effect that reduces to load and suppress broadening, but the width distribution dW of multistage metal pattern bigger than the metal pattern of one section inclination.This may be under parallel portion is depressed state before 1 time, the influence that material is depressed greatly.

In addition, also distinguish: as type A, B metal pattern, metal pattern bottom angled portion contacts with the upside rake of material one side that produces by previous forging and pressing processing, under the situation of this forging and pressing processing conditions (feed, drafts), produce the sliding phenomenon between metal pattern and the material, forging and pressing processing is unstable.

Therefore, the present inventor has finished the Type C metal pattern 6S that has the secondary process face above main machined surface to suppress above-mentioned width distribution and to prevent that beginning to forge and press the slip that adds man-hour is purpose, and this secondary process face carries out depressing of minute quantity.

Though the secondary process face of Type C metal pattern 6S is to gently depressing near the material surface, drafts is very little, so contact length is the same substantially with type B metal pattern 6N with average angle of inclination.And, when carrying out depressing next time, because main machined surface contacts with passing through 12 ° the inclined plane that the secondary process face depresses, so do not produce the material sliding phenomenon.

The result who tests with Type C metal pattern 6S shows, carries out small deformation near making material surface, not only can enlarge width distribution necking section, suppress width distribution, and broadening is had binding effect; By with the secondary process face with respect to the angle of main machined surface be made as ± 5 °, just can prevent the generation of sliding phenomenon.In addition, about load, almost be the same result with the metal pattern 6N of type B.

With the inclination angle of secondary process face is that 5 °～20 ° metal pattern (the metal pattern 6S of other shape and Type C is the same) has carried out same discussion, material does not produce sliding phenomenon during with 7 °～17 ° angle of inclination, has produced sliding phenomenon when surpassing this scope.

According to above discussion, be made as greater than 15 ° by average angle main machined surface rake, can reduce load.But when the differential seat angle of upside gradient and bottom angled degree during greater than 5 °, material easily produces sliding phenomenon.But, result of study according to 1 section inclination, when the inclination angle of bottom surpasses 15 °, material can produce sliding phenomenon, so with the secondary process face with respect to the inclination angle of main machined surface be made as ± below 5 °, next time, once depressing, just can prevent the generation of sliding phenomenon and suppress width distribution and broadening by the finished face of secondary process metal pattern with main 1 pair of rake of processing.The contact length of secondary process metal pattern is long, can cause load to increase and the increase of broadening amount, so the length of secondary process portion is preferably less than 10% of the full contact length of rake.In order with main processing rake next time secondary process metal pattern machined surface to be depressed, main processing rake length (L1+L2) is preferably 0.9～1.0 times of feed.

According to the present invention,, can control width distribution, but also can suppress the broadening amount by in the main processing of hot slab, increasing secondary process.In addition, on the metal pattern of main machined surface, increase the secondary process face, reduce load, suppress width distribution, prevent that sliding stop all can realize with multistage inclination.

(embodiment 8)

Figure 55 is depicted as the formation of the slab building mortion of the embodiment of the invention 8, and Figure 55 (A) represents side view, and Figure 55 (B) represents vertical view.The side direction that the slab building mortion is depressed forging press 52 by the thickness of the thickness that reduces slab 20 and is located at its downstream is depressed forging press 53 and is constituted.The downstream of depressing forging press 53 in side direction disposes milling train 54, further is rolled.Side direction is depressed the forging press outlet side and is provided with width detector 55, is used to detect through side direction depress the width that forging press 53 carried out the slab 20 of side pressure.Be provided with control device 56, be used to import the detected value of this width detector 55, thickness is depressed forging press 52 and side direction depress forging press 53 and control.

Thickness is depressed forging press 52, constitutes by clipping slab 20, be located at metal pattern 6 up and down and drive the drive unit 58 that this metal pattern 6 moves up and down.Drive unit 58 uses mechanical device and hydraulic means, and wherein mechanical device makes the eccentric shaft revolution and produces and move up and down, and drives metal pattern 6 by bar, and hydraulic means moves up and down metal pattern 6 by hydraulic cylinder.Metal pattern 6 adopts the metal pattern of band gradient, is made of horizontal plane and inclined plane with slab 20 contacted sides.

Side direction is depressed forging press 53, by the metal pattern about clipping slab 20 on the width, being located at 59 with this metal pattern 59 reciprocating drive unit 50 on width is constituted.Drive unit 50 adopts the hydraulic cylinder at the interval (aperture) on the width of adjusting two metal patterns 59.It is the same that metal pattern 59 and thickness are depressed forging press 52, adopts the metal pattern of band gradient, and this metal pattern and slab 20 contacted sides are made of horizontal plane and inclined plane.

Below, action is illustrated.

Control device 56 control thickness depress forging press 52 and side direction is depressed forging press 53, make thickness depress forging press 52 and side direction is depressed forging press 53 alternating movements.Thickness is depressed forging press 52 and side direction, and to depress the drive source of forging press 53 are motor, by alternating movement, power supply capacity can be set as and make thickness depress the needed capacity of forging press 52 actions (general, thickness is depressed forging press 52 required electric power and depressed the many of forging press 53 than side direction).

Control device 56 is also controlled the aperture that side direction is depressed forging press 53.Figure 56 is the aperture control flow chart that side direction is depressed forging press 53, and control is illustrated to aperture with reference to this figure.When depressing forging press 52 and depress greatly with thickness, the volume of slab 20 flows to the four directions, also expands to width, as the expression of Figure 55 (B) pattern ground, expand into waveform.If intact width aperture so that this waveform is become linearity, and reaches the width B of regulation.Even set the width aperture for Rack B, owing to depress the backflow phenomenon that the back produces, so the width B that can not get stipulating.The condition that influences this backflow phenomenon is called the initial stage condition.The initial stage condition is the width B of the feed rate of the thickness of slab 20 before reduction in thickness, thickness that material, temperature, the thickness of slab 20 is depressed forging press 52 are depressed and width, slab 20 etc. and regulation.

Control device 56 is with these initial stage condition entries (step S1), according to this initial stage condition molded breadth aperture (step S2).The method of condition molded breadth aperture is according to the initial stage, according to existing experience and test, obtains the influence of each condition to refluxing, and goes out the width aperture according to this data computation.Depress forging press 53 to side direction and assign the width aperture instruction (step S3) of calculating like this.Side direction is depressed forging press 53 and according to this width aperture slab 20 is carried out side pressure.

The width of the slab 20 after the side pressure detects with width detector 55, and feeds back in the control device 56 (step S4).Control device 56 calculates the difference Δ B (step S5) of the width B and the width detection value of regulation.With this difference DELTA B and initial stage condition is benchmark, according to the influence data of each the initial stage condition that illustrates previously to refluxing, the width aperture is revised (step S6).For the side direction that will this revised width aperture be used for the back is depressed forging press, side direction is depressed forging press 53 give an order (step S3).Like this, carry out step S3～step S6 repeatedly, just can obtain the slab 20 of specific thickness.In the makeover process of step S3～step S6, utilize learning functionality just can promptly obtain Rack B, this learning functionality is the correction value that the correction result of front is used to calculate the back.

In the above-described embodiments, be to utilize control device 56 to make thickness depress forging press 52 and side direction is depressed forging press 53 alternating movements, still, also the two mechanically can be combined, alternately move.

According to the above description as can be known, the present invention is located at the downstream that thickness is depressed forging press by side direction being depressed forging press, just can positively revise the distortion of width of plate slab direction.In addition, make two forging press alternating movements, just can reduce power supply capacity.Depress the width aperture of the width of plate slab detected value correction forging press of forging press according to side direction, so can obtain the width stipulated rapidly.

(embodiment 9)

The present inventor produces the problem that material slides during to thickness forging and investigates.Its result shows, sliding phenomenon occurs in metal pattern and material (hot slab) when beginning to contact, and is carrying out not producing slip under the state of to a certain degree depressing.Here, in forging and pressing, according to drafts and feed, metal pattern angle of inclination, the contact site of metal pattern and material is the almost parallel portion (in the present invention, parallel portion and the angle of inclination in the transitional region with metal pattern is that 5 degree are collectively referred to as almost parallel portion with interior part) or the rake of metal pattern.

Figure 57 is the beginning contact-making surface of pattern ground expression metal pattern when being rake, acts on the figure of the power of metal pattern when beginning to contact.Among Figure 57, P represents that N represents that hot slab 20 acts on the reaction force on the metal pattern with the external force of metal pattern 61a, 61b pushing on the hot slab 20, and f represents to act on the frictional force between hot slab and the metal pattern.Among Figure 57, do not forge and press continuously slidably in order to make metal pattern 61a, 61b, the frictional force f among Figure 57 must with depress power component P11 in an inclined direction and equate.And, when component P11 surpasses largest static frictional force μ N, just begin between metal pattern 61a, 61b and the hot slab 20 to slide.Therefore, if represent skid-resistant condition, then μ 〉=t with coefficientoffriction and angle θ between hot slab 20 and metal pattern 61, the 61b _Anθ.Among Figure 57, H represents the thickness of hot slab 20 in the forging and pressing first being processed, and h represents the thickness of hot slab 20 after forging and pressing processing.

When forge hot is pressed, because forging and pressing face is coarse, so the contact condition between material and the metal pattern is bad, again because of on forging and pressing face, producing iron scale, so the coefficient of friction between material and the metal pattern is little.Therefore, when the beginning contact-making surface was the metal pattern rake, the frequency that sliding phenomenon takes place raise.

Therefore, the angle of rake is below 15 degree, under the less situation of feed less at drafts or material, even the material face that was was once forged and pressed by the rake of metal pattern is carried out the forging and pressing of next cycle, material face also can contact continually with the metal pattern rake, raises so produce the frequency that slides.

In present inventor's test, the rake of metal pattern tilts to about 5 degree and does not also produce sliding phenomenon.This may be owing to depress the little cause of the component of power on the entrance side direction.But when the gradient of rake is 5 degree when following, material and metal pattern contact length in the longitudinal direction just become very long, will cause that load increases and with forging and pressing vertical direction (being width among the figure) on the distortion increase, so impracticable.

Different with Figure 57, as shown in Figure 58, when the beginning contact-making surface of metal pattern 61a, 61b and hot slab 20 was the parallel portion 6a of metal pattern 61a, 61b, it was inoperative to depress the component of power on the rake direction, so do not produce sliding phenomenon.According to inventor's result of the test,, the parallel portion 6a of metal pattern 61a, 61b do not produce sliding phenomenon about 5 degree even tilting yet.So to the transitional region 6c of rake 6b transition,, do not produce slip even be that 5 degree begin contact with interior part from the inclination angle from parallel portion yet.

Under situation with the contact of metal pattern parallel portion, do not produce slip even reduce coefficient of friction yet, so lubricant is coated on the main machined surface of metal pattern, be very effective to reduce load.

(concrete example)

Below, with reference to figure embodiments of the invention are described.

In the present embodiment, as shown in Figure 4, be the situation of 1 section metal pattern of rake employing of expression entrance side.Figure 59 is expression during with this 1 section metal pattern, the relation between inclination angle and feed and the drafts.Among Figure 59, (A) the expression drafts is that the occasion of 50 mm, occasion, (C) expression drafts that (B) expression drafts is 100 mm are the occasion of 150 mm.If at the arrow institute how (upper side range of curve) of Figure 59, forging and pressing add and do not produce slip man-hour, can stably forge and press processing.In addition, certain in feed, drafts, only change under the situation at angle of inclination of metal pattern, along with increase, the forging and pressing machining load at the inclination angle of metal pattern reduces,, so also can obtain and reduce the effect that forging press is loaded so in the scope of Figure 59, forge and press.

According to the forging and pressing processing conditions in the scope of the invention, lubricant is coated on parallel portion in the main machined surface of above-mentioned metal pattern, rake, the whole main machined surface, coefficient of friction is reduced, at this moment the effect that reduces to load is adjusted, and the load reduction rate of parallel portion, rake and whole main machined surface is respectively 10%, 20%, 30% as a result.At this moment do not produce sliding phenomenon yet, both can keep forging and pressing the stability of processing, can with lubricator reduce load again.

In the above-described embodiments, to the rake of entrance side is that the situation of 1 section metal pattern is described, but is not limited to this a kind of situation, for example, as shown in Figure 8, also can adopt the rake 6b of entrance side to have 2 sections rake metal patterns 6 such, that have the multistage rake.

As explained in detail above such, the forging method of hot slab according to the present invention, the beginning contact-making surface of hot slab and the metal pattern part as transitional region between rake and the parallel portion and parallel portion is forged and pressed, like this, carry out special metal pattern processing with regard to not needing, produce sliding phenomenon in the time of can avoiding forging and pressing.Therefore, can prevent the operational problem that causes because of slip.In addition, with same drafts, same feed, when considering outside the scope of the invention, to increase the angle of inclination of metal pattern gradually,, therefore, also can reduce the forging press load because direction of the present invention is to strengthen the angle of inclination of metal pattern.Because of not needing that special processing is carried out on the metal pattern surface,, also not be used in to produce and carry out necessary complexity control when sliding again so the processing charges of metal pattern are cheap.

Even on the main machined surface of the part of metal pattern, or apply lubricant on the whole main machined surface, the coefficient of friction of a part of main machined surface or whole main machined surface is reduced, does not also produce sliding phenomenon, thus not only can keep forging and pressing processing stability, but also can reduce load.

(embodiment 10)

The inventor carries out various changes by the donor site to lubricant, comes coefficient of friction is carried out various changes, and the variation that load is reduced effect and advancing slip amount FW is tentatively investigated.That is, to the situation of only lubricant being supplied with metal pattern parallel portion 6a, only lubricant is supplied with metal pattern rake 6b situation, lubricant is supplied with whole 6a, 6b of metal pattern, the situation on the 6c, measured load and advancing slip amount FW respectively.It the results are shown in table 1.In the table 1, advancing slip amount ratio is the index that draws according to FW/ (FW+RW).Illustrate in passing that under same forging and pressing condition, value (FW+RW) is certain substantially.

As known from Table 1, be very big by the lubricated effect that reduces to load, but only lubricated parallel portion 6a also produce effect to metal pattern rake 6b.Advancing slip amount FW is lubricated just and can reduces metal pattern rake 6b, but the metal pattern parallel portion is lubricated, and advancing slip amount is constant substantially.

Table 1. making by lubricated that load reduces, advancing slip quantitative change situation

The lubricant housings	Do not have	Has only rake	Has only parallel portion	Comprehensively
					The effect that reduces to load	????0％	????20％	????10％	30％
Advancing slip amount ratio	????0.42	????0.35	????0.40	????0.33

Its reason may be because the cause of surface pressure distribution on the length direction of metal pattern contact-making surface of forging and pressing.Therefore, by obtain the surface pressure distribution on the length direction with the parsing of slab method.Its result is shown in Figure 61 (a), Figure 61 (b), Figure 61 (c), Figure 61 (d) respectively.

Figure 61 (a) supplies the situation (method of comparative example) of lubricant and lubricated situation about a rake to metal pattern, surface pressure distribution when both are forged and pressed compares the characteristic line chart of back expression, Figure 61 (b) supplies the situation (the inventive method) of lubricant and lubricated situation about a parallel portion to metal pattern, surface pressure distribution when both are forged and pressed compares the performance diagram of back expression, Figure 61 (c) is that the surface pressure distribution that both forging and pressing is added man-hour compares the performance diagram that the back is represented about whole situation for lubricant (existing method) and lubricated situation to metal pattern.The forging and pressing processing conditions is: establish the metal pattern outlet side and be about 8 kg f/mm ²(surface pressing), rake 6b are that 12 °, the amount of the keeping away SD that send of material are 400 mm with respect to the tiltangle of parallel portion 6a.

Shown in Figure 61 (a), Figure 61 (b), Figure 61 (c), surface pressing increases at material inlet side rake.And, be maximum in the position of the central authorities of leaving metal pattern parallel portion one side, also close rake, material velocity herein is consistent with metal pattern speed, becomes so-called neutral point.Put the material outlet side from this neutrality, surface pressing reduces gradually.The method that surface pressing increases is stably at rake 6b place, but very precipitous at parallel portion 6a place.Position whichsoever, coefficient of friction is little, and the increase degree of surface pressing is just little.By general tiltangle (10 °～15 °), the contact length of metal pattern rake 6b is longer than the contact length of parallel portion 6a.

On general metal pattern 6, longer than the contact length of parallel portion 6a with the contact length of rake 6b, so the variable quantity of surface pressing increases when changing the coefficient of friction of metal pattern rake 6b, this situation is shown in Figure 61 (a), neutral point moves to outlet side, and advancing slip amount FW reduces.In addition, distinguished that also surface pressure distribution can reduce when reducing the coefficient of friction of metal pattern parallel portion 6a, shown in Figure 61 (b), the position of neutral point less changes.

Below, the inventor investigates the situation that thickness forging adds the material production slip in man-hour.Its result shows, when the slip of material occurs in metal pattern 6 and begins to contact with hot slab 20, depressing under the state that proceeds to a certain degree, and hot slab 20 does not just produce slip.

When thickness forging, the face with metal pattern rake 6b has carried out forging and pressing forges and presses with metal pattern parallel portion 6a after next process, so just forges and presses on the direction substantially parallel with the material direction of advance.For this reason, various variations are carried out according to drafts (H-h) and feed SP or metal pattern tiltangle in the position that metal pattern 61 and material 20 begin to contact.

The ideograph that Figure 60 is when having represented that the face that begins to contact is rake 6b, the beginning time of contact acts on the various power on the metal pattern 61.Symbol P is equivalent to the power of depressing that metal pattern 61 is pushed among the figure on hot slab 20, and symbol N is equivalent to the reaction force that material (slab) 20 acts on the metal pattern 61, and symbol f is equivalent to the frictional force that produced between hot slab 20 and the metal pattern 61.For metal pattern 61 under the situation that does not produce hot slab 20 slips forges and presses continuously, frictional force f must equate with the power P of depressing component P11 in an inclined direction.In this case, when incline direction component P11 surpassed largest static frictional force μ N, hot slab 20 just began to slide with respect to metal pattern 61.Here, when representing hot slab 20 skid-resistant conditions with coefficientoffriction between material and the metal pattern and tiltangle, the relation of following formula (13) is set up.

μ≥t _anθ????……(13)

The forge hot pressure is coarse because of forging and pressing face, so hot slab 20 is bad with the contact condition of metal pattern 61, again because of produce iron scale on forging and pressing face, so the coefficientoffriction between hot slab 20 and the metal pattern 61 is little.Therefore, when the face that begins to contact is metal pattern rake 61, might produce sliding phenomenon.

Tiltangle be below 15 ° and the big situation of drafts (H-h) under, or under the little situation of the feed SD of hot slab 20, material face after metal pattern rake 6b forging and pressing also begins contact from metal pattern inclined plane 6b mostly when next process forges and presses, might produce sliding phenomenon.But even reduce not to be the coefficient of friction of the metal pattern parallel portion of beginning contact-making surface, the generation frequency of sliding phenomenon can not become yet.

Metal pattern 61 is when the face that begins to contact between the hot slab 20 is metal pattern parallel portion 6a, the component (incline direction component P11) of the power of depressing on the entrance side direction is inoperative, can not produce slip even event is lubricated also metal pattern parallel portion 6a, this is certain.In this case, even to not being that the metal pattern rake 6b of beginning contact-making surface is lubricated also and has no relations.

In present inventor's test, metal pattern rake 6b does not produce sliding phenomenon (may be owing to depress the little cause of the component of power on the entrance side direction) yet when tilting to 5 ° of left and right sides.Therefore, at metal pattern transitional region 6c, tiltangle also can be lubricated less than 5 ° part.

The present invention is not limited to the forging and pressing processing of thickness, certainly, when with the metal pattern that is made of entrance side rake and parallel portion at least hot material being forged and pressed (for example Fixed width forging press), generally is operable.

The lubricant of hot slab forging and pressing usefulness, get final product so long as have the material of the characteristic of the coefficient of friction between metal pattern/slab when reducing to forge and press, for example use graphite, molybdenum bisuphide or kollags such as graphite are mixed with mineral oil (lubricating grease) after mixture etc.In addition, carry out Surface Machining, on the surface of metal pattern, form groove in order to adjust coefficient of friction, owing to can cause the surface of slab to produce defective like this, so do not wish to do like this.

About the method that lubricant is applied on the metal pattern, also considered following the whole bag of tricks: when just forging and pressing, with spray regime with lubricant applying in the gap between material and the metal pattern; Perhaps between slab and slab, apply when unloaded etc., make parallel portion coefficient of friction reduction between metal pattern and the material as long as can apply sufficient lubricant, can regardless of what method.

According to the foregoing description, as shown in table 1, even only parallel portion 6a is lubricated, material 20 does not produce sliding phenomenon yet, and load also can reduce 10%, and advancing slip amount FW is constant substantially, so can carry out thickness forging processing to hot slab effectively.

According to the present invention, with the metal pattern that has at least the main machined surface that constitutes by entrance side rake and parallel portion, when hot slab is forged and pressed, only the parallel portion of metal pattern is reduced coefficient of friction between hot slab and the metal pattern for lubricant, the frequency of hot slab generation slip can not improve like this, forging press load can be reduced, but also the advancing slip amount FW that stipulates can be guaranteed.

The invention has been described with several desirable embodiment, still, is appreciated that the included claim scope of the present invention is not limited to these embodiment.On the contrary, claim scope of the present invention comprises all improvement, correction and the equipollent that additional claim scope is comprised.

Claims (27)

1. hot rolled steel plate process units that utilizes the thickness forging machine, this hot rolled steel plate process units is by roughing equipment, mm finishing mill unit and coiling machine arranged in order, and wherein roughing equipment is used for the hot slab attenuate that continuous casting installation for casting etc. is cast is processed into sheet billet; Mm finishing mill unit is rolled the sheet billet that processes with this roughing equipment, rolls into the hot rolled strip of specific thickness; Coiling machine batches this hot rolled strip, it is characterized in that: above-mentioned roughing equipment is as at least a portion of attenuate manufacturing process, have the forging and pressing means of using the pair of metal mould, this metal pattern has the par of the rake and the outlet side of entrance side, and this hot rolled steel plate process units also has the side pressure means that are located at above-mentioned attenuate forging and pressing means upstream.

2. production method of hot milling steel plate that utilizes the thickness forging machine, this method is to be that the slab of H carries out roughing to the thickness behind the continuous casting, its attenuate is processed into sheet billet, and carry out finish rolling and process, this sheet billet is rolled into the hot rolled strip of specific thickness, batch after the cooling, it is characterized in that: this hot rolled steel plate manufacture method comprises thickness forging processing, it is as rough machined at least a portion, use the metal pattern of the par of a pair of rake with entrance side and outlet side, the reduction ratio r of thickness direction is more than 30%, and carrying out above-mentioned thickness forging first being processed, to carry out side pressure to material, the side pressure drafts that this side pressure drafts determines greater than the function by following formula.

Side pressure drafts=fn (r, H)

3. production method of hot milling steel plate that utilizes the thickness forging machine, it is characterized in that: having pair of metal mould that rake, outlet side have the parallel portion slab after to continuous casting with entrance side is that thickness forging more than 30% adds man-hour carrying out reduction ratio on the thickness direction, the slab leading section at the contact length L on the length direction of above-mentioned metal pattern parallel portion in 0.2～0.4 times scope of the entrance side thickness of slab, slab after this thickness forging processing is carried out roughing continuously, then carry out finish rolling, it is rolled into hot rolled steel plate.

4. production method of hot milling steel plate that utilizes the thickness forging machine, this method is that pair of metal mould with the par with the rake of entrance side and outlet side slab after to continuous casting carries out reduction ratio greater than 0.5 forging and pressing processing on thickness direction, at this moment forging and pressing processing conditions is all in satisfying the scope of following inequality, this inequality is with the rake of above-mentioned metal pattern and material contact length L in the longitudinal direction, feed f, width W before the processing, utilize the volume V after the metal pattern parallel portion is processed, outlet side thickness h and depress that deformation epsilon represents, slab after the pressure processing is carried out roughing continuously, then carry out finish rolling, it is rolled into hot rolled steel plate

εL/W＜A

Vε/(Wfh)＜B

In the formula: A, B are constant.

5. thickness forging method, this method is with the metal pattern with main machined surface roughly rectangular material to be carried out thickness forging, this main machined surface is made of the rake of entrance side and coupled parallel portion at least, before on the thickness direction above-mentioned roughly rectangular material being carried out thickness forging, earlier on width, width is depressed, adjusted to above-mentioned roughly rectangular material, it is characterized in that: at least one end in end and the rearward end before the above-mentioned roughly rectangular material is carried out preform.

6. thickness forging method, this method is with the metal pattern with main machined surface roughly rectangular material to be carried out thickness forging, this main machined surface is made of the rake of entrance side and coupled parallel portion at least, before on the thickness direction above-mentioned roughly rectangular material being carried out thickness forging, on width, above-mentioned roughly rectangular material is depressed earlier, adjust width, it is characterized in that: non-certain width variation delta W and the non-certain-length Δ L that produces at least one end in material leading section and rearward end by above-mentioned thickness forging predicted with following formula, according to this prediction roughly rectangular material leading section is carried out preform

ΔWH=1(W,ε,Ldt)

ΔWT=f2(W,ε,Ldt)

ΔLH=g1(W,h,Ldt)

ΔLT=g2(W,H,Ldt)

In the formula: Δ WH is the non-certain width variable quantity of prediction that produces on the leading section of rectangle material direction of advance by thickness forging; Δ WT is the non-certain width variable quantity of prediction that produces on the rearward end of rectangle material direction of advance by thickness forging; Δ LH is the non-certain-length of prediction that produces on the leading section of direction of advance by thickness forging; Δ LT is the non-certain-length of prediction that produces on rearward end by thickness forging; H is the thickness of the roughly rectangular material of forging press entrance side; H is the thickness of the roughly rectangular material of forging press outlet side; ε [=log (H/h)] is a thickness deformation; Ldt is material and forging and pressing metal pattern contact length in the longitudinal direction; W is the width of roughly rectangular material.

7. thickness pressure processing method, it is characterized in that: this method is with the metal pattern with main machined surface roughly rectangular material to be carried out thickness forging, this main machined surface is made of the rake of entrance side and coupled parallel portion at least, before on the thickness direction above-mentioned roughly rectangular material being carried out thickness forging, on width, above-mentioned roughly rectangular material is depressed earlier, adjust width, carry out preform on the width adjustment direction of the thickness forging processing of adjusting width, its effect is to carry out width distribution in the normal portion of roughly rectangular material in advance.

8. thickness forging method, this method is with the metal pattern with main machined surface roughly rectangular material to be carried out thickness forging, this main machined surface is made of the rake of entrance side and coupled parallel portion at least, before on the thickness direction above-mentioned roughly rectangular material being carried out thickness forging, on width, above-mentioned roughly rectangular material is depressed earlier, adjust width, it is characterized in that: the normal width distribution amount dW of portion and its spacing dL that produces by above-mentioned thickness forging processing predicted with following formula, carry out preform according to this prediction, its effect is to carry out width distribution in the normal portion of roughly rectangular material in advance.

In the formula: dW=F (V, W, h, f, ε)

dL=G(H,h,f)

H: the thickness of the roughly rectangular material of forging press entrance side

H: the thickness of the roughly rectangular material of forging press outlet side

ε [=log (H/h)]: thickness deformation

W: the width of rectangular material roughly

F: thickness forging adds the feed of rectangular material roughly in man-hour

V: the metal pattern parallel portion depress volume

9. thickness forging method, this method is with the metal pattern with main machined surface roughly rectangular material to be carried out thickness forging, this main machined surface is made of the rake of entrance side and coupled parallel portion at least, before on the thickness direction above-mentioned roughly rectangular material being carried out thickness forging, on width, roughly rectangular material is depressed earlier, adjust width, it is characterized in that: respectively preform is carried out in end before the above-mentioned roughly rectangular material and rearward end, and at the preform of the enterprising line width distribution of the normal portion of roughly rectangular material.

10. thickness forging method, this method is with the metal pattern with main machined surface roughly rectangular material to be carried out thickness forging, this main machined surface is made of the rake of entrance side and coupled parallel portion at least, before on the thickness direction above-mentioned roughly rectangular material being carried out thickness forging, on width, above-mentioned roughly rectangular material is depressed earlier, adjust width, it is characterized in that: with non-certain width variation delta W and the non-certain-length Δ L of following formula before roughly rectangular material, producing at least one end in end and the rearward end by above-mentioned thickness forging processing, and width distribution dW and its spacing dL of normal portion predict, respectively preform is carried out in end before the roughly rectangular material and rearward end according to this prediction, and give the preform of the width distribution of the roughly rectangular normal portion of material

ΔWH=f1(W,ε,Ldt)

ΔWT=f2(W,ε,Ldt)

ΔLH=g1(W,h,Ldt)

ΔLT=g2(W,H,Ldt)

dW=F(V,W,h,f,ε)

dL=G(H,h,f)

In the formula: Δ WH is the non-certain width variable quantity of prediction that produces on the leading section of rectangle material direction of advance by thickness forging; Δ WT is the non-certain width variable quantity of prediction that produces on the rearward end of rectangle material direction of advance by thickness forging; Δ LH is the non-certain-length of prediction that produces on preceding auspicious of direction of advance by thickness forging; Δ LT is the non-certain-length of prediction that produces on the rearward end of rectangle material direction of advance by thickness forging; H is the thickness of the roughly rectangular material of forging press entrance side; H is the thickness of the roughly rectangular material of forging press outlet side; ε [=log (H/h)] is a thickness deformation; W is the width of rectangular material roughly; The feed of rectangular material roughly when f is thickness forging; V is the volume of depressing of metal pattern parallel portion; Ldt is roughly rectangular material and forging and pressing metal pattern contact length in the longitudinal direction; H is a material inlet side thickness; H is a material outlet side thickness.

11. each the described thickness forging method according in the claim 5～10 is characterized in that: above-mentioned width adjustment is to carry out with the variable vertical miller of work in-process aperture.

12. thickness forging method according to claim 11 is characterized in that: the roll that adopts type with holes in the vertical miller.

13. each the described thickness forging method according in the claim 5～10 is characterized in that: above-mentioned width adjustment is with carrying out with the side direction forging press of thickness forging machine tandem.

14. a thickness forging method is characterized in that: this forging method has following apparatus, promptly roughly rectangular material is forged and pressed, and has at least the metal pattern of the main machined surface that is made of entrance side rake and coupled parallel portion; Roughly rectangular material is sent to the mechanism of this metal pattern; Above-mentioned metal pattern is depressed the thickness forging device of driving on the thickness direction of rectangular material roughly; Be located at the more upstream side of roll line, the vertical miller of the variable aperture of work in-process than this thickness forging device.

15. a thickness forging method is characterized in that: this forging method has following apparatus, promptly roughly rectangular material is forged and pressed, and has at least the metal pattern of the main machined surface that is made of entrance side rake and coupled parallel portion; Roughly rectangular material is sent to the mechanism of this metal pattern; Above-mentioned metal pattern is depressed the thickness forging device of driving on the thickness direction of rectangular material roughly; Be located at the more upstream side of roll line than this thickness forging device, and be configured in can with the locational side direction forging press of this thickness forging device tandem.

16. a thickness forging method, this method are on one side roughly rectangular hot slab to be sent to successively in the longitudinal direction, Yi Bian forge and press, make the thickness forging method of its reduced thickness, it is characterized in that: it comprises main manufacturing procedure and secondary process operation,

Main manufacturing procedure is with the metal pattern that has at least the main machined surface that is made of entrance side rake and parallel portion, and the thickness H of hot slab before forge and press is reduced to thickness h after the forging and pressing,

The secondary process operation is before above-mentioned main manufacturing procedure, with the rake of the metal pattern with above-mentioned main machined surface and the transition part of parallel portion intersection, to position and near the position thereof that will forge and press, carries out the attenuate forging and pressing on thickness direction.

17. thickness forging method according to claim 1, it is characterized in that: in above-mentioned secondary process operation, sliding amount is under the situation of BW behind the material when material feed is f, forging and pressing, on thickness direction, following position is forged and pressed, this position is positioned at the upstream side at the position that will forge and press with transition part, from determining by following formula with the distance at the position of transition part forging and pressing

(0.9～1.1)×f+(f-BW)×n

In the formula: n is a positive integer.

18. thickness forging method according to claim 16, it is characterized in that: in above-mentioned secondary process operation, when the feed of material is f, the position of attenuate forging and pressing is to be positioned at from above-mentioned transition part only to be the upstream side position of (0.9～1.1) * f distance, and above-mentioned secondary process operation and main manufacturing procedure are alternately carried out.

19. according to each the described thickness forging method in the claim 16～18, it is characterized in that: the ratio at the drafts of the drafts of secondary process and main processing is under the situation of r, and the drafts of above-mentioned secondary process is more than (H-h) * r (r 〉=0.025).

20. according to each the described thickness forging method in the claim 16～18, it is characterized in that: the ratio at the drafts of the drafts of secondary process and main processing is under the situation of r, and above-mentioned secondary process surpasses the position of (H-h) * (1-r) from the drafts of main processing.

21. thickness forging method according to claim 20 is characterized in that: carry out above-mentioned main processing and secondary process simultaneously with same metal pattern.

22. a slab manufacturing process is characterized in that: depress forging press with thickness and slab is carried out thickness depress, thickness is depressed after forging press opens, and depresses forging press with side direction and carries out side pressure.

23. a thickness forging device is characterized in that: comprise that slab is carried out the thickness that thickness depresses depresses forging press; Be located at this thickness and depress the downstream of forging press, the side direction that the width of slab is depressed is depressed forging press; When thickness is depressed forging press and opened, make side direction depress the control device that forging press moves immediately.

24. thickness forging device according to claim 23, it is characterized in that: the downstream of depressing forging press in above-mentioned side direction is provided with the width detector that detects width of plate slab, the aperture that above-mentioned control device is depressed forging press to side direction is adjusted, so that the detected value of width detector reaches setting.

25. thickness forging method, this forging method forges and presses above-mentioned hot slab with the metal pattern with main machined surface, this main machined surface be by the rake that tilts towards the entrance side direction with respect to the hot slab direction of advance be connected with this rake and the parallel portion parallel with above-mentioned direction of advance constitutes, it is characterized in that:

Above-mentioned hot slab and the face that metal pattern begins to contact are the transitional region between above-mentioned rake and the parallel portion and the part of above-mentioned parallel portion.

26. thickness forging method according to claim 25 is characterized in that: in the main machined surface of above-mentioned metal pattern, apply lubricant at least with on the contacted contact-making surface of hot slab.

27. thickness forging method, it is characterized in that: when hot slab being forged and pressed with the metal pattern that has the main machined surface that constitutes by entrance side rake and parallel portion at least, only the parallel portion to metal pattern supplies lubricant, to reduce the coefficient of friction between hot slab and the metal pattern.

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