CN1255227C

CN1255227C - Continuous rolling process for bar or strip-type products

Info

Publication number: CN1255227C
Application number: CN 03130924
Authority: CN
Inventors: T·M·肖尔; M·普乔弗斯基
Original assignee: Morgan Construction Co
Current assignee: Siemens Building Technologies AG
Priority date: 2002-05-08
Filing date: 2003-05-08
Publication date: 2006-05-10
Anticipated expiration: 2023-05-08
Also published as: BR0301322B1; CA2427097A1; BR0301322A; CA2427097C; RU2260487C2; CN1456397A

Abstract

A method for jointing the front end and the tail end of the product sections in a continuous rolling mill, the method turns to the consecutive product sections from the rolling mill frame and offsets the consecutive product sections away from rolling line of the rolling mill and guides them to a welding station along an entering line, then returns to the rolling line of the rolling mill from the welding station along a transporting path to continuous rolling in the consecutive rolling mill frame; meanwhile the former product section is rolling in the consecutive rolling mill frame, one part of the product sections can be provisionally cumulated along the transporting path; in time interval of continuous rolling the cumulated parts in the consecutive rolling mill frame, the tail end of the product sections is kept in the welding station; in this time interval, the front end of the product sections is kept in the welding station; and meanwhile a part of consecutive product sections is provisionally cumulated along the entering line, the kept front end and the tail end are welded in the time interval. The method saves energy and evidently reduces waste loss.

Description

The method and apparatus of continuous rolling strip or bar shaped article incessantly

Related application for reference

The application's requirement is set forth in the priority of the provisional application sequence number 60/378,757 on May 8th, 2002.

Technical field

The present invention generally relates in continuous mill by the steel billet that will separate and produces strip or bar shaped article through the hot rolling of thick, middle and smart rolling mill workshop section, is used for continuing to be rolled incessantly to become possible method and apparatus in the specific location end of selecting along rolling route makes remainder at rolling mill to the independent product section of ground, end welding thereby relate to particularly.

Background technology

In the rolling mill of present employed traditional bars and stick-like, the fact that people accepted is to begin process with the single steel billet that heated in burner hearth, discharges all steel billets then to be rolled into cross section individually and to reduce and have the product section of front end and tail end.There are many shortcomings in such way.For example, the off time between all steel billets, total can cause 10% more than production time loss.

Also have, the preceding and tail end of each product section can't meet the demands in size and/or metallurgical performance, so must cut and abandon them, causes sizable scrap piece loss.Front end also is easy to cause curling round the roll (cobbling), when especially reaching higher speed in the finishing department of rolling mill.

For example, in the 966th page of " iron and steel manufacturing, shaping and processing " (the tenth edition) that AISE publishes, describe a kind of traditional bars and the operation of rolling (seeing also its accompanying drawing 31-3) of stick-like in detail.In addition, in U.S. Pat 5,931, also disclosed the end-to-end welding method of a kind of steel billet in 370.

For make great efforts to avoid these problems, people researched and developed before steel billet is introduced into rolling mill with its end to the end the technology that welds.But proved and so also had some problems.Welding big steel billet cross section needs large-scale equipment, and expends a large amount of electric energy.The steel billet section turns cold with forcing the steel billet end to force together required contacting of heavy hold down gag, so also need extra electric energy to come it is responded to heating more in addition.

Another shortcoming of steel billet welding is that the fusion metal at welding point place also is rolled down among quite long a section of finished product subsequently.For example, be 22,500 square millimeters steel billet when the welding typical cross section is long-pending, when it being rolled into 5.5 millimeters stick-like then, the fusion metal of welding point will extend in the about 94 meters length of finished product.If the metallurgical performance difference of steel billet, this segment length becomes waste material possibly so, makes the rolling mill user suffer considerable damage.

The present invention is applied to solder technology in the operation of rolling in a mode with in the position along rolling route, to avoid with present actual practice associated problem and shortcoming or to make their minimums at least significantly.

Summary of the invention

A kind of the steel billet that separates be rolled through a plurality of roll stands of arranging along a roll line with the product section in succession producing cross-sectional area and reduce and in succession product section have in the continuous mill of front end and tail end tail end with one first product section and join method on the front end of follow-up second product section to, said method comprising the steps of: the transfer rate with the speed of tightening up that surpasses follow-up second roll stand is operated one first roll stand; When first and second product sections when first roll stand comes out, lead and make them depart from the roll line of rolling mill, and enter route guidance to a welding station along one, lead back to the roll line of rolling mill then from welding station along a transfer path, rolling in second roll stand, to continue; When first product section is rolled, temporarily accumulate a first of first product section along transfer path in second roll stand; In the time interval that the first that accumulation is got up is rolled in second roll stand continuously, keep the tail end of first product section to be positioned at the welding station place; In the described time interval, keep the front end of second product section to be positioned at the welding station place, and temporarily accumulate a second portion of second product section along entering route simultaneously; Welding maintains in the described time interval front end and tail end; And the end of the such welding of release.

Description of drawings

Fig. 1 is the plane according to equipment one embodiment of the present invention;

Fig. 2 A-2J is the schematic diagram that is illustrated in the state in succession in the operation of equipment shown in Figure 1;

Fig. 3 is the plane according to an alternate embodiment of equipment of the present invention; And

Fig. 4 is the amplification profile that the line 4-4 along Fig. 3 is intercepted, and has schematically described the memory capacity of piling up of accumulator.

The specific embodiment

Begin to see also Fig. 1, the first and second vertical and horizontal roll stands 10 and 12 are depicted as and are positioned along a rolling mill roll line " P ".Roll stand 10 for example can comprise the most last roll stand of the roughing workshop section of rolling mill, and frame 12 can comprise first roll stand of the middle workshop section of rolling mill.The transfer rate of roll stand 10 is greater than the speed of tightening up of roll stand 12.Like this, in an exemplary operation, for a rolling mill with the rolling 2000 kilograms steel billet of 150 tonnes speed per hour, it is 57.4 square millimeters bars that roll stand 10 will be produced cross-sectional area with the transfer rate of 2052.5 mm/second.The speed of tightening up of roll stand 12 will be 1642 mm/second.

Steering gear 11 is arranged to the continuous product section guide deviations rolling mill roll line P that will come out from roll stand 10, and one enter route 14 along what guide a welding station 16 into, and transmit route 15 from welding station along one and get back to the rolling mill roll line, be rolled in roll stand 12 and all follow-up roll stands (not shown) with continuation.Perhaps, steering gear 11 can be operable to from entering the next door process of route 14, thereby the product section that allows to separate can move on along roll line P.

One first storage device of one repeater, 18 forms is positioned on the position of transmitting route 15, also is that one second storage device of a repeater 20 forms is positioned on the position that enters route 14.Repeater 18,20 can be to be the known traditional design form of those skilled in the art.

Welding station 16 comprises that the product section that is configured to weld adjacency trails the soldering apparatus 22 with leading edge.Continuing before transmission route 15 advances, welding point to be carried out flash removed by a burr remover 24.If desired, welding point and adjacent product section can be heated before roll stand 12 by an induction heater 26 again.

Drive pinch roll

28,30,32 and 34 and be arranged on the key position, carrying out moving forward of product processed section with control.

Now the operation of this equipment is described with reference to Fig. 2 A-2J.

Fig. 2 A

One first product section A is just so that per hour 150 tons the speed and the speed of 2052.5 mm/second are rolled by roll stand 10.Product section A passes through along entering route 14, passes welding station 16, and advances along transmitting route 15, and its front-end A _FEArrived pinch roll unit 34 places, it temporarily stops at this place.One first of first product section has begun with a circle A _LForm in repeater 18, accumulate.

Fig. 2 B

Circle A in repeater 18 _LIncrease significantly, and the front-end A of first product section _FE Pass rolling unit 34 now and entered into roll stand 12.The rolling speed of roll stand 12 is per hour 120 tons, and the speed of tightening up is 1642 mm/second.

Fig. 2 C

At repeater 18 circle A _LReached its maximum.The tail end of first product section has just left the front end B of roll stand 10, the second product sections _FEJust near roll stand 10.

Fig. 2 D

Front end B as the second product section B _FEWhen entering roll stand 10, the tail end A of the first product section A _TEJust moving into and entering route 14.

Fig. 2 E

The tail end A of the first product section A _FEFront end B with second product section _FEArrived welding station 16 places, at this place, they are maintained fixed into the relation of adjacency by pinch roll unit 32,30.The welding of front end and tail end begins.

Fig. 2 F

When front end and tail end weld, the first product section circle A in repeater 18 _LLittle by little use up, and the second product section B is with circle B _LForm in repeater 20, accumulate.

Fig. 2 G

Front end that welds and tail end advance to roll stand 12 from welding station 16, and before have been accumulated in the circle B in the repeater 20 _LJust transfer on the repeater 18 by

pinch roll

30,32.

Fig. 2 H

As product circle B _LWhen repeater 20 continues to transfer on the repeater 18, the tail end B of second product section _TEArrive roll stand 10 places.

Fig. 2 I

As preceding with reference to as described in Fig. 2 D, as the front end C of a three products section C _FEWhen entering roll stand 10, the tail end B of second product section _TENow just moving into and entering route 14.

Fig. 2 J

The tail end B of second product section _TEBegin to be welded to the front end C of three products section _FEOn, as described in reference Fig. 2 E.

Drive all

pinch roll unit

28,30,32 and 34 individually, thereby can selectively control, to quicken, to slow down in order to realize above-mentioned moving and to stop in succession product section.Although welding is preferably when front end and rear end stop at welding station 16 places and finishes, also can operate

pinch roll

30,32 with front end and the rear end of slowing down simply, and soldering apparatus 22 can identical speed move, in advancing, to finish welding.

In case a leading product is fed into roll stand 12, just carry out in any follow-up frame in the remainder of that frame and rolling mill continual rolling afterwards continuously.

The tail end that front end and cross-sectional area reduce can be realized apace in the welding at welding station 16 places, and the energy that is consumed is minimum, and use is more small-sized, more cheap welding equipment.

Fig. 3 and 4 shows alternate embodiment of the present invention, in these figure, the part identical with part embodiment illustrated in fig. 1 mark identical label.Here, the repeater 20 of first embodiment is substituted by a multipole accumulator 40.

As can be from Fig. 4 finding, this accumulator comprise around a circular trace 44 arrange, vertical stacking many to guide roller 42.Guide roller forms a spiral transmission route 46, and the structure in this path and being sized to provides the suitable memory capacity of product memory capacity with the repeater 20 of Fig. 1 embodiment.

In view of aforementioned content, those those skilled in the art that will appreciate that, the present invention turns to all product sections in succession of coming out from roll stand 10, make it depart from roll line P, and along entering route 14 (or 46) arrival welding station 16, and transmit route 15 from welding station along one and get back to roll line, in roll stand 12, be rolled with continuation.Repeater 18 is worked on the transmission side of welding station with

pinch roll unit

32 and 34, accumulates temporarily to store one first of a product section, and the tail end of this product section is stopped at welding station place or the deceleration of its welding station place.

Repeater 20 (or accumulator 44) is worked at the approaching side of welding station with

pinch roll unit

28 and 30, stops at the welding station place or slows down at the welding station place with the leading edge with next product section, and temporarily store one second accumulation of this product section.

First and second product accumulations make to have time enough and is used for the tail end and the front end that stop or slowing down in welding station place welding.So just with the products of separated section accepted from roll stand 10 continuously the feeding product section to roll stand 12.

The most advantageously the present invention is used to engage and has the product section of scope about the cross-sectional area that reduces of 700-4400 square millimeter.Here, the length that the fusion metal extend through of welding point is relatively short, this length is about 3-18 rice.Like this,, compare, can make scrap piece loss minimum with those scrap piece loss that before rolling, stood when welding even welded steel billet section with different metallurgical performances.

Claims

One kind the steel billet that separates be rolled through a plurality of roll stands of arranging along a roll line with the product section in succession producing cross-sectional area and reduce and in succession product section have in the continuous mill of front end and tail end tail end with one first product section and join method on the front end of follow-up second product section to, said method comprising the steps of:

Transfer rate with the speed of tightening up that surpasses follow-up second roll stand is operated one first roll stand;

When first and second product sections when first roll stand comes out, lead and make them depart from the roll line of rolling mill, and enter route guidance to a welding station along one, lead back to the roll line of rolling mill then from welding station along a transfer path, rolling in second roll stand, to continue;

When first product section is rolled, temporarily accumulate a first of first product section along transfer path in second roll stand;

In the time interval that the first that accumulation is got up is rolled in second roll stand continuously, keep the tail end of first product section to be positioned at the welding station place;

In the described time interval, keep the front end of second product section to be positioned at the welding station place, and temporarily accumulate a second portion of second product section along entering route simultaneously;

Welding maintains in the described time interval front end and tail end; And the end of the such welding of release.
2. the method for claim 1 is characterized in that, before welding ends is rolling in second roll stand it is carried out deburring.
3. method as claimed in claim 1 or 2 is characterized in that, before product section is rolling in second roll stand it is heated again.
4. the method for claim 1 is characterized in that, described front end and tail end stop when welding at the welding station place.
5. the method for claim 1, its feature exists, and the cross-sectional area of described product section is in about 700 to 4400 square millimeters scope.
6. become to have in the rolling mill of product section in succession of front end and tail end at the billet rolling that will separate, a kind of tail end that is used for one first product section joins the equipment on the front end of follow-up second product section to, and described equipment comprises:

First and second roll stands of arranging along the roll line adjoining land of a rolling mill, and first roll stand can surpass the transfer rate running of the speed of tightening up of second roll stand;

Guider, first and second product sections that come out from first roll stand that are used for leading make them depart from the roll line of rolling mill, and enter route along one they are directed to a welding station, along a transfer path they are led back to the roll line of rolling mill from welding station then, and get back to roll stand;

First storage device, a first that is used for when first product section is rolled, temporarily accumulating first product section in second roll stand along transfer path;

Holding device is used for keeping in the time interval that the first of accumulating first product that gets up is rolled in second roll stand continuously the tail end of first product section and the front end of second product section to be positioned at the welding station place;

Second storage device was used in the described time interval, temporarily accumulated a second portion of second product section along entering route; And

Welder at described welding station place, the front end and the tail end that are used for maintaining weld together, so the end that discharges welding like this will allow first and second product sections to be rolled continuously and without interruption in second roll stand.
7. equipment as claimed in claim 6 is characterized in that, described holding device can be operated so that front end and tail end are stopped at described welding station place.
8. equipment as claimed in claim 6 is characterized in that, also comprises along transmitting route, being used for the welding front-end and back-end of described first and second product sections are carried out the device of deburring.
9. as claim 6 or 7 described equipment, it is characterized in that, also comprise being used for the device that before described second roll stand, heats again.
10. equipment as claimed in claim 6 is characterized in that, described first storage device comprise be used for the circle form accumulate a repeater of described first.
11. equipment as claimed in claim 6 is characterized in that, described arresting stop is included in entering of described welding station and transmits some driving pinch roll unit on the side.