CN101712045B

CN101712045B - Method for rolling H-shaped steel

Info

Publication number: CN101712045B
Application number: CN2009103114380A
Authority: CN
Inventors: 陶功明; 王彦中; 马朝辉; 林刚; 程铖
Original assignee: Pangang Group Steel Vanadium and Titanium Co Ltd; Pangang Group Panzhihua Steel and Vanadium Co Ltd
Current assignee: Pangang Group Steel Vanadium and Titanium Co Ltd; Pangang Group Panzhihua Steel and Vanadium Co Ltd
Priority date: 2009-12-15
Filing date: 2009-12-15
Publication date: 2012-07-04
Anticipated expiration: 2029-12-15
Also published as: CN101712045A

Abstract

The invention discloses a method for rolling H-shaped steel, which can shorten the development period of a new species and comprises a BD area rolling process and a universal area rolling process; the last hole of a BD area is a pilot hole, and the first hole of a universal area is a universal rough rolling hole; as for the H-shaped steel with the specification of 600mm (width)*300mm (leg length) and below, the parameter range for rolling the H-shaped steel with different specifications by the same BD area process are as follow: the leg length difference delta D is not more than 50mm, the waist thickness difference delta E is not more than 10mm and the leg thickness difference delta C is not more than 20mm; the hole transition from the pilot hole to the universal rough rolling hole meets the condition that the abdominal cavity width difference delta L is not more than 50mm to reduce the time for preparing a BD area roller during variety replacement, thereby greatly shortening the development period of the product; by adopting the method, the development time of the new product can be shorten about a half, the development success ratio can be doubled, and the method is suitable for the H-shaped steel with the specification of 600mm (width)*300mm (leg length) and below.

Description

H rolling of sectional iron method

Technical field

The present invention relates to the steel rolling field, especially a kind of H rolling of sectional iron method.

Background technology

In H shaped steel new varieties research and development design process, all make every effort to reduce the new varieties cost, shorten the new varieties cycle, because the maximum technological design difficulty of universal rolling H shaped steel is the rolling mill practice design in BD district.The final rolled piece supplied materials size in BD district is decided by last hole, i.e. the size of pilot hole is omnipotent roughing first hole and the transition pass in BD district and omnipotent district is first hole in pilot hole and omnipotent district.

Therefore, if different cultivars H shaped steel is used the development-success ratio that same BD district rolling mill practice can improve H shaped steel.But to above-mentioned imagination really be applied in the actual Rolling Production, also must consider the coupling between the omnipotent roughing hole of BD district pilot hole and each kind.

The roller of H shaped steel BD unit system is made up of horizontal roller up and down, adopts the mode of directly rolling, and the regional pass of BD is as shown in Figure 1.

H shaped steel universal mill roller system forms omnipotent breakdown pass by horizontal roller and transmission side, two edger rolls of fore side up and down, and the pass in omnipotent zone is as shown in Figure 2.

That universal rolling H shaped steel generally is applicable to is rolling " wide * leg is long " is 600 * 300 and the middle-size and small-size H shaped steel of following specification; Large H-shaped steel generally adopts assembly welding method to make, and also has in the practice to utilize assembly welding method to make a small amount of middle-size and small-size H shaped steel.

Summary of the invention

In order to overcome long deficiency of existing universal mill new varieties cycle, technical problem to be solved by this invention provides a kind of H rolling of sectional iron method that can shorten the new varieties cycle.

The technical solution adopted for the present invention to solve the technical problems is: H rolling of sectional iron method; Comprise BD district rolling mill practice and omnipotent district rolling mill practice; Last pass in BD district is a pilot hole, and first pass in omnipotent district is omnipotent roughing hole, is the H shaped steel of 600mm * 300mm and following specification to " wide * leg is long "; The parameter area of using the rolling different size H of same BD district technology shaped steel is: the long difference of leg Δ D≤50mm, the thick poor Δ E≤10mm of waist, the thick poor Δ C≤20mm of leg; The long difference of leg Δ D, the thick poor Δ C of leg, the thick poor Δ E definition of waist be as follows: suppose that D1, C1, E1 are respectively that the leg of a certain specification H shaped steel is long, leg is thick, waist is thick, D2, C2, E2 are respectively that the leg of another specification H shaped steel is long, leg is thick, waist is thick, Δ D=|D1-D2|; Δ C=|C1-C2|, Δ E=|E1-E2|.

Pilot hole satisfies to the pass transition in omnipotent roughing hole: abdominal cavity stand out Δ L≤50mm, and abdominal cavity stand out Δ L defines as follows: Δ L=|A-B|, wherein, A is a pilot hole abdominal cavity width, B is abdominal cavity, an omnipotent roughing hole width.

The invention has the beneficial effects as follows: to the characteristics of universal mill; Propose H rolling of sectional iron method of the present invention, cut down the time of preparing BD district roll when changing kind, shortened the Products Development cycle greatly; On this basis; Provided in conjunction with rolling experience and to carry out the transition to the pass parameter that omnipotent roughing hole can reference by pilot hole and change, adopted the present invention to produce, new product can shorten for 1/2nd development time approximately; Development-success ratio can double, and the present invention is applicable to that " wide * leg is long " specification is at 600mm * 300mm and following H shaped steel.

Description of drawings

Fig. 1 is the pass sequence chart of H rolling of sectional iron production line BD unit.

Fig. 2 is the pass sequence chart of the omnipotent unit of H rolling of sectional iron production line.

Fig. 3 is the specification sketch map of finished product H shaped steel.

Be labeled as among the figure, the 1-pilot hole, the omnipotent roughing of 2-hole, A-pilot hole abdominal cavity width, abdominal cavity, B-omnipotent breaking down hole width, the C-leg is thick, and the D-leg is long, and the E-waist is thick.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further specified.

Like Fig. 1, Fig. 2 and shown in Figure 3; Combine long-term pass parameter comparison to draw H rolling of sectional iron method of the present invention according to mill rolling practice; Comprise BD district rolling mill practice and omnipotent district rolling mill practice, last pass in BD district is a pilot hole 1, and first pass in omnipotent district is omnipotent roughing hole 2; To " wide * leg is long " is the H shaped steel of 600mm * 300mm and following specification; The parameter area of using the rolling different size H of same BD district technology shaped steel is: the long difference of leg Δ D≤50mm, the thick poor Δ E≤10mm of waist, the thick poor Δ C≤20mm of leg, the long difference of leg Δ D, the thick poor Δ C of leg, the thick poor Δ E definition of waist as follows: suppose that D1, C1, E1 are respectively that the leg of a certain specification H shaped steel is long, leg is thick, waist is thick, D2, C2, E2 are respectively that the leg of another specification H shaped steel is long, leg is thick, waist is thick; Δ D=|D1-D2|; Δ C=|C1-C2|, Δ E=|E1-E2| is because of having used same BD district rolling mill practice to the H shaped steel of the different cultivars in the above-mentioned parameter scope; Thereby cut down the time of preparing BD district roll when changing kind, shortened the Products Development cycle greatly.

As shown in Figures 2 and 3, as far as H shaped steel, the thick C of its leg can adjust through left and right sides edger roll; Therefore this size can be adjusted through adjustment edger roll gap values between rollers; The thick E of its waist can adjust through horizontal roller up and down, and the long D of its leg then can adjust through omnipotent roughing hole 2 omnipotent edging mill afterwards, and the gradient different cultivars of its leg is much the same; Comprehensive rolling result of the test mainly must be considered the relation between pilot hole abdominal cavity width A and abdominal cavity, the omnipotent roughing hole width B.

For H rolling of sectional iron method of the present invention; Preferred pilot hole 1 satisfies to the pass transition in omnipotent roughing hole 2: abdominal cavity stand out Δ L≤50mm, and abdominal cavity stand out Δ L defines as follows: Δ L=|A-B|, wherein; A is a pilot hole abdominal cavity width, and B is abdominal cavity, an omnipotent roughing hole width.When the approaching H shaped steel kind of several sizes being carried out the pass design; Generally design pilot hole 1 according to the kind of size in the centre; Design each kind omnipotent roughing hole 2 separately again; Rolling requirement generally can both be satisfied in pilot hole 1 and the omnipotent roughing hole 2 designed according to this parameter area, thereby has improved the new varieties success rate.

Rolled piece gets into omnipotent roughing hole 2 after going out from pilot hole 1, and omnipotent breaking down horizontal roller will be processed the abdominal cavity of rolled piece.

If pilot hole abdominal cavity width A is less than abdominal cavity, omnipotent roughing hole width B; Rolled piece is 2 pressure broadenings in omnipotent roughing hole, and in the broadening process, rolled piece receives the nip pressure effect; Rolled piece each several part metal begins distortion, the filling pass flows; Under the situation of suitable drafts, rolled piece each several part metal can be good at being full of die cavity, and omnipotent breaking down horizontal roller has been carried out sufficient processing to rolled piece; The abdominal cavity of rolled piece and shank metal all are out of shape according to forming a groove, and this moment, specification was more satisfactory.Roll pass during the 2 back entering of the omnipotent roughing of rolled piece process hole are omnipotent; In omnipotent finishing groove, be processed into finished product more at last, in this process, the rolled piece position such as abdominal cavity, leg waist junction of broadening rolled piece has gradually obtained good processing; See from elongated specification; It is also very little to fluctuate, and in each pass, can both obtain good processing, finally becomes qualified finished product.

If pilot hole abdominal cavity width A is greater than abdominal cavity, omnipotent roughing hole width B; Then rolled piece adds man-hour for bearing broadening in omnipotent breakdown pass; The stressed less inside extrusion molding of shank metal of inboard leg this moment; If this moment can surface quality not occur and specification does not conform to, then can use same BD district rolling mill practice.

Embodiment:

Certain factory's production specification (wide * leg length * leg is thick * and waist is thick; Unit is mm) be respectively three kinds of H shaped steel of 150 * 150 * 10 * 9,200 * 200 * 14 * 18,250 * 250 * 34 * 18; Adopt H rolling of sectional iron method of the present invention; BD district rolling mill practice designs as standard with the H shaped steel of 200 * 200 * 14 * 18 specifications, and all the other two kinds are used the BD district rolling mill practice that is same as this specification H shaped steel, and three description sizes producing meet the requirements of the standard fully.Simultaneously, defectives such as folding do not appear in leg waist junction yet.

Claims

1.H rolling of sectional iron method; Comprise BD district rolling mill practice and omnipotent district rolling mill practice; Last pass in BD district is pilot hole (1), and first pass in omnipotent district is omnipotent roughing hole (2), it is characterized in that: to " wide * leg is long " is the H shaped steel of " 600mm * 300mm " and following specification; The parameter area of using the rolling different size H of same BD district technology shaped steel is: the long difference of leg Δ D≤50mm, the thick poor Δ E≤10mm of waist, the thick poor Δ C≤20mm of leg; The long difference of leg Δ D, the thick poor Δ C of leg, the thick poor Δ E definition of waist be as follows: suppose that D1, C1, E1 are respectively that the leg of a certain specification H shaped steel is long, leg is thick, waist is thick, D2, C2, E2 are respectively that the leg of another specification H shaped steel is long, leg is thick, waist is thick, Δ D=|D1-D2|; Δ C=|C1-C2|, Δ E=|E1-E2|.

2. H rolling of sectional iron method as claimed in claim 1; It is characterized in that: pilot hole (1) satisfies to the pass transition in omnipotent roughing hole (2): abdominal cavity stand out Δ L≤50mm; Abdominal cavity stand out Δ L defines as follows: Δ L=|A-B|; Wherein, A is a pilot hole abdominal cavity width, and B is abdominal cavity, an omnipotent roughing hole width.