CN101195124B - Method for tandem rolling steel flat for automobile beam - Google Patents

Method for tandem rolling steel flat for automobile beam Download PDF

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Publication number
CN101195124B
CN101195124B CN2007103024775A CN200710302477A CN101195124B CN 101195124 B CN101195124 B CN 101195124B CN 2007103024775 A CN2007103024775 A CN 2007103024775A CN 200710302477 A CN200710302477 A CN 200710302477A CN 101195124 B CN101195124 B CN 101195124B
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pass
rolling
machines
mill
automobile
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CN2007103024775A
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Chinese (zh)
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CN101195124A (en
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张银生
陈跃武
夏兆春
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江苏沙钢集团淮钢特钢有限公司
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Publication of CN101195124A publication Critical patent/CN101195124A/en
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Abstract

The invention discloses a method for rolling continuously band steels which are used for automobile beam plates, which comprises sending a steel billet into a stove and heating, firstly, removing phosphates through a phosphate removing machine after the steel billet is taken out from the stove, then, sending the steel billet into continuous rolling mills and rolling, shearing the steel billet into fixed times scales after the steel billet is cooled by a cold bed, and thereby a finished product is formed. The arranging form of mills is that a vertical-type mill is arranged intermediately, three horizontal mills, the vertical-type tandem mill, a horizontal mill are respectively distributed in turn from end to end, the reasonable pressing-down quantities of both middle rolling and fine rolling and a reasonable hole-type system are designed. The invention is enabled to use an assembly line of small-sized continuous rolling to roll the band steels which are used for the automobile beam plates, and the invention has the advantages of simple operation, good product quality, high output and low comprehensive producing cost, the band steels can be welded into the automobile beam plates directly, and the invention has simple manufacturing process and low cost. The invention widens the rolling range of small-sized continuous mills.

Description

The method for tandem rolling of steel flat for automobile beam

Technical background

Domestic traditional automotive frame production method, mainly be with flame cutting 16Mn steel plate to required width and cut lengths, the material after the cutting carried out reconditioning after, weld again, be processed into required automotive frame.If adopt artificial flame cutting, then the waste that causes of cutting action is bigger, also need carry out necessary polishing, to guarantee the smooth of solder side; If adopt cutting automatically, then need certain device investment and regular maintenance, increased spending.Traditional processing method is not only wasted seriously, manufacturing cost height, and the crossbeam after the machine-shaping, and product surface quality is relatively poor, and rigidity, intensity all are lower than mother metal, and bearing capacity is restricted.

The now existing a plurality of iron and steel enterprises of automotive frame band steel produce, and mainly are to produce on open-train mill or semi-tandem rolling.(1), directly be rolled, major advantage is that technology is simple, and shortcoming is that labor productivity is low, and the product lateral bending is serious, and quality of edges is bad with open-train mill.(2), earlier use the open-train mill cogging, it is rolling to enter the tandem rolling unit then.Major advantage is that the product quality of edges is better, and shortcoming is that labor productivity is still very low, and lateral bending is still serious, need align again.Above-mentioned two kinds of used blanks of milling train generally are rectangular blooms, or big section blank.All need to use large-sized rolling mills, investment is big.

Summary of the invention:

The technical problem to be solved in the present invention provides a kind of method for tandem rolling of steel flat for automobile beam, and the production efficiency that overcomes existing milling method existence is low, and the product lateral bending is serious, the quality of edges defect of bad.

The present invention is achieved through the following technical solutions:

The method for tandem rolling of steel flat for automobile beam is characterized in that comprising the following steps:

(1) the little square billet of 140-150mm specification is sent in the stove heated, tapping temperature is 1000-110) 0 ℃, the iron scale of billet surface is removed earlier through the dephosphorization of dephosphorization machine in the back of coming out of the stove, and the dephosphorization water pressure is 12-20MPa; Then,

(2) enter the tandem rolling unit and be rolled, the milling train arrangement form is: middle for vertical mill, and arrange to head and the tail respectively and be followed successively by three horizontal mills, a vertical mill, a horizontal mill;

Horizontal mill: in roll drafts and be controlled at 6~15mm, the finish rolling drafts is controlled at 2~5mm; Vertical mill: in roll drafts and be controlled at 12~20mm, the finish rolling drafts is controlled at 8~12mm;

The pass of milling train is arranged as: No. 1 machine is that box pass, No. 2 machines are that square pass, 3, No. 4 machines are that shallow slot pass, No. 5 machines are that plain-barreled roll, No. 6 machines are that edging pass, 7,8, No. 9 machines are that plain-barreled roll, No. 10 machines are that edging pass, No. 11 machines are plain-barreled roll;

(3) band steel after step (2) is rolling is transported to cold bed through roller-way, about slow cooling to 320 on the cold bed ℃, descends cold bed to cut to be cut into through pendulum then and decides multiple length and be finished product.

Rolling stable for making, auxilliary corresponding import and export guide and guard, that is: vertical mill inlet guide opening degree is 180-210mm, and height is 20-40mm, and it is 40-60mm that plate length is defended in outlet; Horizontal mill import guide and guard opening degree is 150-190mm, and the guide plate width of outlet guide is 160-200mm.

The bottom land width 180-220mm of described shallow slot pass, the gradient 15-25 degree of the sidewall of pass, the upright groove depth 45-55mm of described edging pass, the gradient 5.7-7.5 degree of the sidewall of pass.

The present invention has determined the rational arrangement form of milling train.For the width that guarantees on small connecting rolling machine, can roll enough with little square billet, No. 2 vertical mill opposite side portions by roughing simply process, suitably shape is expected in control, and 3-5,7-9 machine are set to horizontal mill, reduce breaking down and in roll processing to the rolled piece width, make rolled piece obtain bigger width as far as possible.

Join simultaneously with rational pass.One is that 3, No. 4 machines are designed to the shallow slot pass, pass is superficial, bottom land is flat and wide, the sidewall of pass has been auxiliary guide effect, do not play restricted spread, like this, allow material shape when 3, No. 4 machines are rolling, form unrestricted spread, the material shape that roughing is come out is enough wide, be convenient to later process and add man-hour, can obtain enough width, can guarantee to obtain on the width good processing again; The 2nd, designed the edging pass of suitable crossbeam band steel, the edging pass design is crucial, and a, pass is dark, angle of sides is little, and big band steel is not easy to take off groove, easily produces the curling round the roll production accident; B, angle of sides are too big, make rolling instability again, and product quality can't be guaranteed; C, pass design too dark, and the roll alloy-layer is thick inadequately, and roll is not wear-resisting, can't realize steadily rolling yet; D, pass design too shallow, cause the roll gap opening degree too big, produce also instability like this, and quality also can not get guaranteeing.Through exploring repeatedly, finally designed comparatively reasonably big band steel pass schedule.

Join simultaneously with roll in reasonably, the control range of finish rolling milling train drafts.The material shape size of each passage of reasonable distribution is to realize steady rolling assurance, because equipment mainly is to roll middle-size and small-size bar, milling train power and equipment roll-force are not too big, if material shape unreasonable distribution is easy to produce milling train excess load phenomenon, and and then damage equipment.According to the rolling mill practice characteristics, and the bonding apparatus situation, rolling drafts in determining and be controlled at 6~15mm, the finish rolling drafts is controlled at 2~5mm; Vertical mill: in roll drafts and be controlled at 12~20mm, the finish rolling drafts is controlled at 8~12mm.Also join with rational guide and guard system, the guiding rolled piece is smoothly into and out of milling train.

The present invention be thick, in roll suitable processing, finish rolling is accurately controlled, and makes crossbeam band steel limit portion both obtain good processing, has guaranteed dimensional accuracy of products again.

The present invention compared with prior art has following obvious advantage:

One, with the rolling automotive frame band steel of small-sized continuous rolling production line, have simple to operate, good product quality, output height, the comprehensive low advantage of production cost.

Two, the present invention produce 140, the wide automotive frame band steel of 146mm, surface quality is good, and adjacently situated surfaces is vertical in twos, and impact flexibility is better, flexibility≤2.5 ‰, lateral bending≤1.5 ‰, yield point σ s 〉=345MPa, tensile strength sigma b are 470~630MPa, percentage elongation δ 5 〉=21%, can directly be welded into automotive frame, processing technology is simple, and cost is low.

Three, the present invention develops the rolling kind that makes new advances for small connecting rolling machine, has widened the rolling scope of small connecting rolling machine.

Description of drawings:

Fig. 1 arranges schematic diagram for milling train of the present invention.Among the figure Be horizontal mill, Be vertical mill.

Fig. 2 is a design of section of rolling mill schematic diagram of the present invention.1 is that box pass, 2 is that square pass, 3,4 is that shallow slot pass, 5 is that plain-barreled roll, 6 is that edging pass, 7,8,9 is that plain-barreled roll, 10 is that edging pass, 11 is a plain-barreled roll among the figure.Among the figure shelf number 1-11 number of sequence number 1-11 and milling train corresponding.

The specific embodiment:

(1) be rolled with the little square billet of Q345 B 150mm, strand sent in the syllogic walking beam reheating furnace heated, tapping temperature is about 1050 ℃, and steel is come out of the stove the back earlier through the dephosphorization of dephosphorization machine, removes the iron scale of billet surface, and the dephosphorization water pressure is 12-20MPa; Then,

(2) enter the tandem rolling unit and be rolled, roughing milling train cantilevered milling train, in milling train with short-stress path Φ 450 milling trains, the finish rolling milling train is with short-stress path Φ 370 milling trains;

As shown in Figure 1, the milling train arrangement form is middle for vertical mill, arranges to head and the tail respectively and is followed successively by three horizontal mills, a vertical mill, a horizontal mill;

Horizontal mill: in roll drafts and be controlled at 10mm, the finish rolling drafts is controlled at 4mm, vertical mill: in roll drafts and be controlled at 15mm, the finish rolling drafts is controlled at 10mm; Vertical mill inlet guide opening degree is 190mm, and height is 30mm, and it is 55mm that plate length is defended in outlet; Horizontal mill import guide and guard opening degree is 165mm, and the guide plate width of outlet guide is 180mm;

As shown in Figure 2, the pass of milling train is arranged as: No. 1 machine is that box pass, No. 2 machines are that square pass, 3, No. 4 machines are that shallow slot pass, No. 5 machines are that plain-barreled roll, No. 6 machines are that edging pass, 7,8, No. 9 machines are that plain-barreled roll, No. 10 machines are that edging pass, No. 11 machines are plain-barreled roll; The bottom land width 190mm of described shallow slot pass, gradient 22 degree of the sidewall of pass, the upright groove depth 50mm of described edging pass, gradient 6.2 degree of the sidewall of pass;

(3) band steel after step (2) is rolling is transported to the rack-and-pinion step cooling bed through roller-way, is naturally cooling on the cold bed about 320 ℃, descends cold bed to be cut into through 330 tons of pendulum then and decides multiple length and promptly obtain 146mm * 16mm (wide * thick) crossbeam band steel finished product.

Crossbeam band steel finished product is through checking: flexibility≤2.5 ‰, and lateral bending≤1.5 ‰, yield point σ s 〉=345MPa, tensile strength sigma b are 470~630MPa, percentage elongation δ 5 〉=21%.

Claims (2)

1. the method for tandem rolling of steel flat for automobile beam is characterized in that comprising the following steps:
(1) the little square billet of 140-150mm specification is sent in the stove heated, tapping temperature is 1000-1100 ℃, and the iron scale of billet surface is removed earlier through the dephosphorization of dephosphorization machine in the back of coming out of the stove, and the dephosphorization water pressure is 12-20MPa; Then,
(2) enter the tandem rolling unit and be rolled, the milling train arrangement form is: middle for vertical mill, and arrange to head and the tail respectively and be followed successively by three horizontal mills, a vertical mill, a horizontal mill;
Horizontal mill: in roll drafts and be controlled at 6~15mm, the finish rolling drafts is controlled at 2~5mm; Vertical mill: in roll drafts and be controlled at 12~20mm, the finish rolling drafts is controlled at 8~12mm;
The pass of milling train is arranged as: No. 1 machine is that box pass, No. 2 machines are that square pass, 3, No. 4 machines are that shallow slot pass, No. 5 machines are that plain-barreled roll, No. 6 machines are that edging pass, 7,8, No. 9 machines are that plain-barreled roll, No. 10 machines are that edging pass, No. 11 machines are plain-barreled roll;
The bottom land width 180-220mm of described shallow slot pass, the gradient 15-25 degree of the sidewall of pass, the upright groove depth 45-55mm of described edging pass, the gradient 5.7-7.5 degree of the sidewall of pass;
(3) band steel after step (2) is rolling is transported to cold bed through roller-way, is naturally cooling on the cold bed about 320 ℃, descends cold bed to be cut into through pendulum then and decides multiple length and be finished product.
2. the method for tandem rolling of steel flat for automobile beam as claimed in claim 1, it is characterized in that: vertical mill inlet guide opening degree is 180-210mm, and height is 20-40mm, and it is 40-60mm that plate length is defended in outlet; Horizontal mill import guide and guard opening degree is 150-190mm, and the guide plate width of outlet guide is 160-200mm.
CN2007103024775A 2007-12-27 2007-12-27 Method for tandem rolling steel flat for automobile beam CN101195124B (en)

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Application Number Priority Date Filing Date Title
CN2007103024775A CN101195124B (en) 2007-12-27 2007-12-27 Method for tandem rolling steel flat for automobile beam

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CN101195124B true CN101195124B (en) 2010-06-23

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103909092B (en) * 2014-03-24 2015-11-25 湖北时力模具材料有限公司 A kind of heating once and rolling method of Cr12MoV cold-work die band steel
CN106670230B (en) * 2016-12-23 2018-06-19 江苏沙钢集团淮钢特钢股份有限公司 Cogging, tandem rolling and the cold big specification rectangle steel production technology being combined of control
CN109248915A (en) * 2018-07-12 2019-01-22 新疆八钢铁股份有限公司 The continuous rolling process of double cushion rubber socket steel
CN110560481A (en) * 2019-09-26 2019-12-13 武汉钢铁集团鄂城钢铁有限责任公司 High-precision right-angle flat steel continuous rolling process method

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN1390654A (en) * 2001-06-11 2003-01-15 大冶特殊钢股份有限公司 Technology and guide apparatus for rolling round steel of flat steel without pass
CN1857807A (en) * 2006-05-30 2006-11-08 江阴博丰钢铁有限公司 Hot rolling process of wide flat bar steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1390654A (en) * 2001-06-11 2003-01-15 大冶特殊钢股份有限公司 Technology and guide apparatus for rolling round steel of flat steel without pass
CN1857807A (en) * 2006-05-30 2006-11-08 江阴博丰钢铁有限公司 Hot rolling process of wide flat bar steel

Non-Patent Citations (5)

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Title
刘阳春等.焊接汽车大梁用Q345B扁钢连铸连轧实践.江苏冶金31 5.2003,31(5),27-30.
刘阳春等.焊接汽车大梁用Q345B扁钢连铸连轧实践.江苏冶金31 5.2003,31(5),27-30. *
张浩.小型连轧机设计中的几个问题.轧钢 1.1993,(1),7-13.
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