Method for achieving double inclination of rolling mill horizontal roller of H-shaped steel finishing mill group

Abstract

The invention relates to an H-shaped steel finishing mill group rolling mill horizontal roller double-inclination method, and belongs to the technical field of H-shaped steel finishing mill group rolling processes in the metallurgical industry. According to the technical scheme, according to the rolling direction, the arrangement mode of 11 finish rolling continuous rolling mills is that the inclination of the side wall of a horizontal roller of a universal mill of H1 + U2 + U3 + E1 + U4 + U5 + E2 + U6 + U7 + E3 + U8, U2, U3, U4 and U5 is double inclination, the double inclination comprises the lower inclination of the side wall of the roller and the upper inclination of the side wall of the roller, and the lower inclination of the side wall of the roller is smoothly connected with the upper inclination of the side wall of the roller through an arc. And the flange metal amount and the flange thickness of a rolled piece can be increased. The method has the beneficial effects that the adjusting time for changing the production and adjusting the specification can be shortened, the rolling operation rate is improved, and the shift production is improved; and finished products to be repaired can be effectively reduced, the rolling qualification rate is increased, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The invention relates to a method for double-slope horizontal rollers of an H-beam finishing mill group, and belongs to the technical field of rolling process of an H-beam finishing mill group in the metallurgical industry. Background Art

[0002] More than 95% of my country's steel mills use universal rolling mills to roll H-beams or I-beams, and the forms and categories of universal rolling methods are becoming more and more diverse. If a steel mill's H-beam finishing mill consists of 11 rolling mills, the hole process parameters of each rolling mill are designed according to conventional ideas, the roll hole side wall slope and fillet radius gradually decrease from the first rolling mill to the finished rolling mill, the horizontal roll side wall slope of each universal rolling mill is a single slope, and the mill roll width gradually increases. The side wall slope is the inclination of the hole side wall to the vertical line of the roll axis.

[0003] The problems existing in the prior art are: 1. When the rolling volume reaches more than 2,000 tons after changing specifications, the deviation between the 1 / 4 flange thickness and the flange end thickness of the finished rolled piece is more than 0.16 mm, which increases the difficulty of adjusting the negative difference of the finished rolled piece. If the slope of the side wall of the finished roll is 90°, the amount of roll turning will increase after the roll is worn, reducing the number of times the roll is used. 2. When debugging the sub-specifications (e.g. H298×149×5.5×8), the vertical roll reduction of the two universal rolling mills U2 and U3 is relatively large relative to the horizontal roll reduction. This is mainly because the E1 edge rolling mill is used to reduce the flange height of the rolled piece after U3, which is convenient for adjusting the geometric dimensions of the finished product. However, this adjustment method is likely to cause the flange end of the rolled piece to be thin in the subsequent passes, especially in U6 and U7 rolling (to ensure the balance of the waist and leg extension ratio of the rolled piece during the U6 and U7 rolling process, and because the web of the rolled piece is thicker in the early rolling process, the flange of the finished rolled piece will be thinner overall), increasing the difficulty of adjustment and taking too long to adjust. The adjustment slow rolling takes 40 minutes, affecting the output by 152 tons. See the table below:

[0004] In addition, when rolling sub-specifications, the finished rolled products are prone to thin flange ends and necking problems, which results in limited methods for adjustment personnel to adjust the flange height of the sub-specification finished rolled products, and it is difficult to control the flange height of the finished rolled products, which makes flange wave defects very likely to occur.

[0005] Summary of the invention

[0006] The purpose of the present invention is to provide a method for double-slope horizontal rollers of an H-beam finishing mill, which can increase the amount of metal at the flange end of the rolled piece during the previous rolling process, reduce the adjustment time, improve the rolling operation rate, and solve the problems existing in the background technology.

[0007] The technical solution of the present invention is: A method for double slope of horizontal rolls of H-beam finishing mill group rolling mill, according to the rolling direction, the arrangement of 11 sets of finishing rolling mills is H1+U2+U3+E1+U4+U5+E2+U6+U7+E3+U8, wherein H1 is a two-roll universal rolling mill, which presses down the web thickness and flange height of the rolled piece; E1, E2 and E3 are two-roll edge rolling mills, which press down the flange height of the rolled piece and process the flange end face shape of the rolled piece ; U2, U3, U4, U5, U6, U7 and U8 are four-roll universal rolling mills, which reduce the web thickness of the rolled piece and the flange thickness of the rolled piece; The side wall inclination of the horizontal rolls of the four universal rolling mills U2, U3, U4 and U5 is a double inclination, which includes the lower inclination of the roll side wall and the upper inclination of the roll side wall. The lower inclination of the roll side wall and the upper inclination of the roll side wall are smoothly connected by an arc line, which increases the metal amount and flange thickness of the rolled piece.

[0008] The lower slope of the U2 roller side wall and the upper slope of the U2 roller side wall are 100° and 97° respectively, the lower slope of the U3 roller side wall and the upper slope of the U3 roller side wall are 98° and 96° respectively, the lower slope of the U4 roller side wall and the upper slope of the U4 roller side wall are 96° and 94° respectively, and the lower slope of the U5 roller side wall and the upper slope of the U5 roller side wall are 96° and 94° respectively.

[0009] The roll widths of the four universal rolling mills U2, U3, U4 and U5 are all unchanged, the roll width of U2 is 259 mm, the roll width of U3 is 269 mm, the roll width of U4 is 277 mm, and the roll width of U5 is 277 mm.

[0010] The arc connecting the lower slope of the roller side wall and the upper slope of the roller side wall adopts a circular arc with a radius of 50 mm in order to prevent the roller from scratching the inner flange surface of the rolled piece during the finishing rolling process.

[0011] The specifications of the finished H-shaped steel after rolling are H300×150×6.5×9, in mm.

[0012] The vertical rollers of the U2 and U8 rolling mills are flat rollers, which are conducive to flange plane processing and reduce the occurrence of flange bending defects. The vertical rollers of the U3, U4, U5, U6 and U7 rolling mills are 3° tapered rollers, which are conducive to increasing the flange height of the rolled piece, reducing the flange thickness and have certain benefits for increasing the rolling volume of the finished product rolling mill.

[0013] The steel section rolling method is semi-continuous rolling, and the billet can be rolled reversibly for 3 or 5 passes (odd number of passes). The billet hole arrangement method can be selected according to the billet material type, rolling specifications, billet motor power and roller body length. The general arrangement method can be divided into: semi-closed hole + open hole (finished product), split hole + semi-closed hole + open hole (finished product) or box hole + open hole ++ semi-closed hole + open hole (finished product).

[0014] The lower slope of the roller side wall (the lower slope of the U2 roller side wall, the lower slope of the U3 roller side wall, the lower slope of the U4 roller side wall and the lower slope of the U5 roller side wall) is a single slope in the existing technology. The present invention adds an upper slope of the roller side wall (the upper slope of the U2 roller side wall, the upper slope of the U3 roller side wall, the upper slope of the U4 roller side wall and the upper slope of the U5 roller side wall) to increase the metal amount and thickness at the flange end of the rolled piece.

[0015] The beneficial effects of the present invention are: it can shorten the adjustment time of production change and specification adjustment, improve the rolling operation rate, and increase the shift production; it can effectively reduce the production of finishing and repair products, improve the rolling qualification rate, and reduce the labor intensity of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the U2 hole pattern diagram of the present invention; Figure 2 U3 hole pattern diagram of the present invention; Figure 3 It is the U4 hole pattern diagram of the present invention; Figure 4 It is the U5 hole pattern diagram of the present invention; In the figure: U2 roller width 1, U2 roller side wall lower slope 2, U2 roller side wall upper slope 3, U3 roller width 4, U3 roller side wall lower slope 5, U3 roller side wall upper slope 6, U4 roller width 7, U4 roller side wall lower slope 8, U4 roller side wall upper slope 9, U5 roller width 10, U5 roller side wall lower slope 11, U5 roller side wall upper slope 12. DETAILED DESCRIPTION

[0017] The present invention will be further described below by way of examples in conjunction with the accompanying drawings.

[0018] A method for double slope of horizontal rollers of H-beam finishing mill group, according to the rolling direction, the arrangement of 11 finishing rolling mills is H1+U2+U3+E1+U4+U5+E2+U6+U7+E3+U8, wherein H1 is a two-roll universal mill, which presses down the web thickness and flange height of the rolled piece; E1, E2 and E3 are two-roll edge rolling mills, which press down the flange height of the rolled piece and process the flange end face shape of the rolled piece; U2, U3, U4, U5, U6, U7 and U8 are four-roll universal rolling mills, which reduce the web thickness of the rolled piece and the flange thickness of the rolled piece; the side wall inclination of the horizontal rolls of the four universal rolling mills U2, U3, U4 and U5 is a double inclination, which includes the lower inclination of the roll side wall and the upper inclination of the roll side wall. The lower inclination of the roll side wall and the upper inclination of the roll side wall are smoothly connected by an arc line, which increases the metal amount and flange thickness of the rolled piece.

[0019] The lower slope 2 of the U2 roller side wall and the upper slope 3 of the U2 roller side wall are 100° and 97° respectively, the lower slope 5 of the U3 roller side wall and the upper slope 6 of the U3 roller side wall are 98° and 96° respectively, the lower slope 8 of the U4 roller side wall and the upper slope 9 of the U4 roller side wall are 96° and 94° respectively, the lower slope 11 of the U5 roller side wall and the upper slope 12 of the U5 roller side wall are 96° and 94° respectively.

[0020] The roll widths of the four universal rolling mills U2, U3, U4 and U5 are all unchanged, the roll width 1 of U2 is 259 mm, the roll width 4 of U3 is 269 mm, the roll width 7 of U4 is 277 mm, and the roll width 10 of U5 is 277 mm.

[0021] The arc connecting the lower slope of the roller side wall and the upper slope of the roller side wall adopts a circular arc with a radius of 50 mm in order to prevent the roller from scratching the inner flange surface of the rolled piece during the finishing rolling process.

[0022] The specifications of the finished H-shaped steel after rolling are H300×150×6.5×9, in mm.

[0023] The vertical rollers of the U2 and U8 rolling mills are flat rollers, which are conducive to flange plane processing and reduce the occurrence of flange bending defects. The vertical rollers of the U3, U4, U5, U6 and U7 rolling mills are 3° tapered rollers, which are conducive to increasing the flange height of the rolled piece, reducing the flange thickness and have certain benefits for increasing the rolling volume of the finished product rolling mill.

[0024] The steel section rolling method is semi-continuous rolling, and the billet can be rolled reversibly for 3 or 5 passes (odd number of passes). The billet hole arrangement method can be selected according to the billet material type, rolling specifications, billet motor power and roller body length. The general arrangement method can be divided into: semi-closed hole + open hole (finished product), split hole + semi-closed hole + open hole (finished product) or box hole + open hole ++ semi-closed hole + open hole (finished product).

[0025] The lower slope of the roller side wall (the lower slope of the U2 roller side wall, the lower slope of the U3 roller side wall, the lower slope of the U4 roller side wall and the lower slope of the U5 roller side wall) is a single slope in the existing technology. The present invention adds an upper slope of the roller side wall (the upper slope of the U2 roller side wall, the upper slope of the U3 roller side wall, the upper slope of the U4 roller side wall and the upper slope of the U5 roller side wall) to increase the metal amount and thickness at the flange end of the rolled piece.

[0026] The theoretical basis of the present invention is to increase the metal amount of the flange end of the rolled piece in the first few passes during the finishing rolling process, so that the flange can have sufficient metal amount when the rolled piece enters the next few passes to meet the rolling requirements. In the initial adjustment, only the slope of the side wall of the finishing rolling U2 and U3 is modified (the upper slope is reduced by 1 degree, and the thickness is increased by 0.5mm), and the test is repeated many times, and the experimental data is summarized to achieve the ideal test goal.

[0027] The present invention compares the difference between double slope and single slope of the roller through the rolling conditions of small and medium-sized steel production lines for two years as shown in the following figure:

[0028] In this example, refer to the attached Figure 1-4 , H-beam specifications; 1H300×150×6.5×9, the process parameters of U2-U5 rolling mills are shown in the table below, and the process parameters of other rolling mills are conventional designs.

[0029] U2-U5 rolling mill process parameters

[0030]

[0031] The present invention reduces the number of finished rolled pieces to be repaired, reduces the difficulty of adjustment, and improves the rolling operation rate by optimizing the pass parameters of U2, U3, U4 and U5. At the same time, the size, surface quality and mechanical properties of the finished rolled pieces all meet national standards.

[0032] During the long-term test, the wear degree of U2, U3, U4 and U5 rollers was controlled within the normal range, the difference in leg height between the head, middle and tail of the finished profile was within 0.5mm-1.2mm, the difference in waist height between the head, middle and tail was within 0.2mm-0.6mm, and the difference in flange thickness between the head, middle and tail was within 0.1mm-0.2mm, which met the standard requirements.

Claims

1. A method for double slope of horizontal rolls of H-beam finishing mill, characterized in that: According to the rolling direction, the arrangement of the 11 finishing rolling mills is H1+U2+U3+E1+U4+U5+E2+U6+U7+E3+U8, among which H1 is a two-roll universal mill, which reduces the web thickness and flange height of the rolled piece; E1, E2 and E3 are two-roll edge rolling mills, which reduce the flange height of the rolled piece and process the flange end face shape of the rolled piece; U2, U3, U4, U5, U6, U7 and U8 are four-roll universal mills, which reduce the web thickness of the rolled piece and reduce the flange thickness of the rolled piece; the side wall inclination of the horizontal rolls of the four universal mills U2, U3, U4 and U5 is a double inclination, which includes the lower inclination of the roll side wall and the upper inclination of the roll side wall, and the lower inclination of the roll side wall and the upper inclination of the roll side wall are smoothly connected by an arc line to increase the metal amount and flange thickness of the rolled piece.

2. The method for double slope of horizontal rolls of an H-beam finishing mill according to claim 1, characterized in that: The lower slope of the U2 roller side wall and the upper slope of the U2 roller side wall are 100° and 97° respectively, the lower slope of the U3 roller side wall and the upper slope of the U3 roller side wall are 98° and 96° respectively, the lower slope of the U4 roller side wall and the upper slope of the U4 roller side wall are 96° and 94° respectively, and the lower slope of the U5 roller side wall and the upper slope of the U5 roller side wall are 96° and 94° respectively.

3. The method for double slope of horizontal rolls of an H-beam finishing mill according to claim 1 or 2, characterized in that: The roll widths of the four universal rolling mills U2, U3, U4 and U5 are all unchanged, the roll width of U2 is 259 mm, the roll width of U3 is 269 mm, the roll width of U4 is 277 mm, and the roll width of U5 is 277 mm.

4. The method for double slope of horizontal rolls of an H-beam finishing mill according to claim 3, characterized in that: The vertical rollers of the U2 and U8 rolling mills are flat rollers, which are conducive to flange plane processing and reduce the occurrence of flange bending defects. The vertical rollers of the U3, U4, U5, U6 and U7 rolling mills are 3° tapered rollers, which are conducive to increasing the flange height of the rolled piece and reducing the flange thickness.

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