Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
  • B21B1/088—H- or I-sections
  • B21B1/0886—H- or I-sections using variable-width rolls

Definitions

• the present invention relates to a method and an apparatus for hot rolling an H-section steel used in the fields of, for example, construction and civil engineering, and in particular, is arranged in a compact space in a limited space to achieve high efficiency and high yield.
• the present invention relates to a hot rolling method and apparatus for H-section steel capable of rolling and reducing the number of rolls.
• Tandem rolling is a rolling method in which rolling is performed simultaneously by a plurality of rolling mills in close proximity.
• the coarse universal mill UR and the Ezja miller E have been reduced to evening because the rolling speed has to be synchronized and the penetration is required. It is common to provide the finishing universal mill UF independently of it. Therefore, even if tandem rolling was adopted, the lengthening of the H-section rolling line was inevitable.
• Fig. 1 shows an example of the roll pass design of X-force river + X-force river + H-force river in this rolling method.
• H-section 1 is U R—E U F, and U F ⁇ E ⁇ U
• R indicates that reverse rolling is being performed.
• ⁇ , ⁇ , and ⁇ F are U, respectively.
• Kyokai Hei 4-258301 discloses a shape steel having a parallel flange composed of three units of coarse unit mill, edge mill and finish universal mill arranged in tandem.
• One of the coarse universal mill and the finishing universal mill is a variable width roll, and the other horizontal roll is a fixed width roll [side surface of the horizontal roll.
• the angle (taper) of each is desirably 0 °].
• a rolling mill for section steel is disclosed, and the rolling mill is used to reduce the pressure by either the coarse universal mill or the finished universal mill.
• a method for rolling a section steel which controls the web height of a rolled material is disclosed.
• Fig. 4 shows an example of a roll pass design by this rolling method. All of U R, E and U F are rolled by H force river.
• H-section steel 1 is sequentially rolled by horizontal rolls 40, 42, 44 and vertical rolls 46, 48 of UR, E. UF, and variable width rolls are used for E and UF.
• the web height is expanded and reduced at the UF.
• U F, and U F respectively.
• Fig. 5 shows an example of the flange penetration trouble observed in the above-mentioned rolling method.
• Fig. 5 (a) shows the appearance of the H-section steel penetration into the UR mill.
• Fig. 5 (b) shows the state at the end of UR mill rolling.
• the center of the UR mill consisting of the horizontal roll 50 and the vertical roll 56 and the center of the H-beam 1 as the rolled material and the force ⁇
• the horizontal roll 50 comes into contact with the flange tip of the section steel 1 in the area ⁇ .
• the flange 2a of the H-section steel 1 has a small width, while the flange 2b has a large width. Inconsistent die widths occur.
• an object of the present invention is to provide a method and an apparatus for rolling an H-section steel capable of exhibiting the following effects by using a tandem rolling mill train of URE-UF.
• the inventor applied a rough universal mill (UR), an edge miller (E) and a rough universal mill (B) to a rough shaped steel slab obtained by break down rolling by reverse rolling.
• UR rough universal mill
• E edge miller
• B rough universal mill
• a large number of rolling experiments were conducted using a UR_E — UF tandem rolling mill train consisting of three units, namely a rolled and finished universal mill (UF).
• UF a rolled and finished universal mill
• the present inventor has a roll structure in which a coarse universal mill (UR) and a horizontal roll which is divided into two and whose width can be adjusted in the roll axis direction are incorporated into each.
• a rolling mill consisting of three mills, an edge mill (E) and a finishing universal mill (UF)
• E edge mill
• UF finishing universal mill
• the vertical roll 74 also has a double conical shape having a taper with the same inclination angle R.
• the body of the horizontal roll 76 of Edge Minore (E) also has a taper angle of 0 E inclination angle.
• cage, the inclination angle means that the taper angle e F side of the horizontal rolls 78 of the inclined angle theta e is fitted to the aforementioned inclination angle S R. finish Interview two Basarumi le (UF) was about 0 °.
• the oral pass design in this example is configured to be X caliber-X force river-H force river.
• FIG. 8 (a) and 8 (b) The relationship between the H-section steel and the rolling roll at this time is shown in Figs. 8 (a) and 8 (b), respectively, just before the finished H-section steel is put into the universal mill (UF) and after the rolling is completed. This is schematically shown. In that case, as shown in FIG. 8 (a), it was found that it is desirable that the gap 5 between the side surface of the variable width horizontal roll 78 and the inside of each end of the flange 2 should be 3 to 4 mm or more. The upper limit is different depending on the flange width ⁇ For example, for 200 ⁇ width It may be 8 mm or less.
• the inner width of the web of the rolled material after finishing universal rolling is W
• the gap ⁇ between the side surface of the variable width roll 76 of the edge miller (E) and the inside of each end of the flange 2 is again 2 to 4 mm. It is desirable to make the above, but if it is too large, it may cause a difference in flange width between left and right. In other words, it is desirable that 5 be in the range of 2 to 15. More preferably less than 8 mm c
• W F and WE are the case where each point to the web in the width in the finish universal mils and edge Jiya mils, although Ru if and there pointing to width of variable horizontal rolls, both are the same ⁇ , In the present specification, both are denoted by the same reference numerals for convenience.
• the present invention has been completed based on the above findings, and the gist thereof is as follows.
• a rough universal mill having a fixed width horizontal roll and an edge mill having a fixed width or a variable width roll are applied to a coarse billet with a web and a flange after break down rolling.
• the rough universal mill has an X-force river
• the edger mill has an X-force river
• the finished universal mill has an H-force river.
• Hot rolling method for H-section steel ( (2) In the above (1), the horizontal roll width W R of the coarse universal mill and the roll body width VV E of the edge mill are substantially the same.
• Coarse universal mill with fixed width horizontal rolls, edge mill with variable width rolls, and variable width In a method for producing an H-section steel by subjecting a finishing universal mill having horizontal rolls to hot reversible rolling by three types of rolling mills, the coarse universal mill comprises an X-force river, and The jig miller has an X-force river, and the finished universal mill has an H-force river. Each of these three types of rolling mills is used for continuous rolling from the downstream side to the upstream side. In the pass, the body width W E of the width variable opening of the edger mill is smaller than the horizontal roll width W R of the coarse universal mill and the horizontal roll width W F of the finishing universal mill. Set this Hot rolling method of H-beams to FEATURE: the.
• the horizontal roll of the coarse universal mill has a variable width structure.
• a hot rolling method for H-section steel characterized by the following.
• FIG. 1 is an explanatory diagram of an example of a conventional roll pass design of a universal mill.
• FIG. 2 is a schematic perspective view showing a sawing flaw on the inner surface of the flange.
• FIG. 3 is an explanatory diagram of an example of flange embedding.
• FIG. 4 is an explanatory diagram of another example of a conventional roll pass design of a universal mill.
• FIG. 5 (a) and FIG. 5 (b) are explanatory diagrams of an example of the flange insertion trouble.
• FIG. 6 is an explanatory diagram of an example of an H-section steel production line embodying the present invention.
• FIG. 7 is an explanatory diagram of an example of a roll pass design for implementing the present invention.
• FIG. 8 is an explanatory view of the rolling process of the H-section steel in the UF mill according to the present invention.
• FIGS. 8 (a) and (b) show the H-section steel in the finishing universal mill (UF), respectively.
• FIG. 3 is a schematic diagram showing a state immediately before the rolling and after the rolling is completed.
• FIG. 9 is an explanatory view of the rolling process of the H-section steel with the E-mill according to the present invention.
• FIGS. 9 (a) and 9 (b) show that the H-section steel is added to the edge miller (E), respectively.
• It is a schematic diagram which shows the state immediately before inset and the state after completion of rolling, respectively.
• FIG. 10 is an explanatory diagram showing one deformation process of a rolled material in the H-beam rolling method of the present invention.
• FIG. 11 is an explanatory view showing the deformation process of the rolled material in the method of rolling an H-beam according to the present invention.
• FIG. 12 is an explanatory view of another example of the H-shaped manufacturing line for implementing the present invention
• FIG. (a) and (b) show the layout of the rolling line and the roll pass design, respectively, when the UR mill is provided with a variable horizontal roll having three divisions.
• FIG. 6 shows one of the production lines of the H-section steel for realizing the present invention, and the structure and operation of the present invention will be more specifically described based on this example. explain.
• FIG. 7 shows the path design of the rolls incorporated in each of the rough universal mill (UR), edge mill (E), and finish universal mill (UF) mills of the rolling mill row in the present invention. It is.
• UR rough universal mill
• E edge mill
• UF finish universal mill
• the breakdown rolling may be performed in the same manner as in the conventional method, whereby the rolled material is rolled into a coarse billet.
• multiple-pass reverse rolling was performed using three evening roll mills consisting of a coarse universal mill, an edge miller and a finished universal mill in the UR-E_UF arrangement.
• the UF mill finishes the flange width, inner web width, flange thickness and web thickness of the final target dimensions.
• the method of setting the horizontal roll width of each mill is as shown in Fig. 7.
• the horizontal roll width W R of the UR mill should be set almost according to the inner width of the web of the H-section steel of the product. This is generally the case, and the same is set in the present invention.
• the allowance for the product width ⁇ 5 ram is expected in consideration of the roll wear allowance.
• shank width W E of the horizontal rolls may be set in accordance with the W r
• the number with respect to the horizontal roll width W F is W E for UF Mi Le M! Set a wider value in the range of ⁇ 10 and several M.
• W F> WE - is a W r.
• Yotsute W F W r the final pass in the UF mils, is to such a finishing web within the width of the means that H-shaped steel.
• the horizontal opening 6 of the E-mil may be a variable width roll in the above description, or may be a fixed width, and the roll body width WE of this stand is basically W. there is no problem even if rather small order of a few mm compared to the match is a good force ,, W R who was
• reverse rolling is performed by the tandem rolling mill train configured as described above.
• FIG. 10 shows the deformation process of the rolled material by the rolling method according to the above embodiment of the present invention.
• V R UR horizontal roll width
• W E E horizontal roll shank width
• W F shows UF horizontal roll width
• the inner web width of the rolled material at the UF mill is reduced.
• the horizontal roll of the E-mil should have a structure that allows online width adjustment in a short time.
• Such a width adjusting mechanism is disclosed, for example, in Japanese Patent Publication No. 60-72603.
• the variable horizontal roll angle of the E mill is ⁇ R
• UF mill width variable horizontal roll angle 0 F 0 : Set to 0.5
• Fig. 11 The deformation process of the rolled material in the rolling method according to this aspect of the present invention is shown in Fig. 11, that is, according to the rolling method of the present invention having the above configuration, each pass from the downstream side to the upstream side (even number) that path), ie Oite from UF mils on each pass of rolling to the E mil, web within the width of the material to be rolled when narrowing only ⁇ to the E mil is a W F, W F> W E Therefore, the state of penetration of the material to be rolled into the E mill is as shown in Fig. 9 (a) and (b), and the rolling flaws such as flange penetration problems and nail flaws on the flange inner surface are shown. Can be prevented.
• the width of the variable width horizontal roll is set so that the specified product dimensions (web height, flange thickness, flange width) can be obtained, and then the rolled material is rolled. The wood is finished into a product.
• the inner width of the flange is not increased at the UF mill of the odd-numbered pass in comparison with the base shown in FIG. 10, and the side of the variable width horizontal roll of the UF mill is not required. In particular, the effect that the wear of the corner portion can be reduced is exhibited.
• a structure in which a horizontal roll of a coarse universal mill is divided in an axial direction to allow width adjustment reversible rolling may be performed in a tandem rolling mill train consisting of three UR-E-UF mills in the same manner as described above.
• Figures 12 (a) and (b) show the UR mill with a 3-part variable width horizontal roll, the E-mil with a 2-part width variable horizontal roll, and the UF mill with a 2-part width variable horizontal roll. The layout of the rolling line and the roll pass design when each roll is set are shown.
• the product defined by the horizontal roll width W R of the coarse universal mill and the inner width of the web of the H-section steel are manufactured in comparison with the base of FIG. 11 and FIG. Possible dimensions W area is expanded, and the number of rolls can be further reduced
• Table 1 below shows the prior art and the present invention in Japanese Patent Publication No. 6-83845 and Japanese Patent Laid-Open No. 4-258301 in comparison with their configurations and effects, respectively. It shows that there is a remarkable synergy with the conventional technology.
• This embodiment shows an embodiment of the present invention based on the deformation process of the H-section steel shown in FIG.
• the working ratio of the rolling line in this example was as shown in FIG.
• the target product dimensions were H500 X 200 X 10 16 (mm), and the roll pass design was as shown in Fig. 7.
• W F (La scan Bok path 470 hidden, La scan Bok path or more data (> 48 Oram) is found in the rolling pass schedule was as shown in Table 2 (Material: 700w>: 3001, CC Sula B)
• the rolling conditions in this example were as follows.
• the working rate of the rolling line in this example was as shown in FIG.
• the target product dimensions are ⁇ 500 ⁇ 200 x 10/16 (mm).
• the roll pass design is shown in Figure 7.
• This embodiment shows an embodiment of the present invention using the pass schedule shown in FIG. 11 when a variable width horizontal door is used for the U R mill.
• the target product dimensions were H500X 200 X 10/16 (state).
• the rolling pass schedule in this example was as shown in Table 2 (Material: 700 wx 300 CC slab).
• the rolling condition at this time was 150 rolls without any rolling trouble. There were no rolling flaws, the dimensional accuracy of the obtained product was excellent, and the rolling yield was good. [Table 2]
• the present invention eliminates the problem of flange penetration during rolling and the occurrence of rolling flaws such as sawing flaws on the inner surface of a product flange as seen in the prior art, and
• An object of the present invention is to provide an excellent rolling method capable of producing a highly efficient H-section steel by performing continuous reversible rolling using three mills. Furthermore, by using variable width horizontal rolls for the finishing universal mill and the coarse universal mill, high-quality, high-yield products can be manufactured without frequent roll changes in response to roll wear. This is an excellent method and has extremely high industrial utility value.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

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• 1996
  • 1996-03-15 DE DE69623208T patent/DE69623208T2/de not_active Expired - Fee Related
  • 1996-03-15 ES ES96906060T patent/ES2182966T3/es not_active Expired - Lifetime
  • 1996-03-15 AU AU49557/96A patent/AU693326B2/en not_active Ceased
  • 1996-03-15 WO PCT/JP1996/000688 patent/WO1996029160A1/ja active IP Right Grant
  • 1996-03-15 EP EP96906060A patent/EP0760263B1/de not_active Expired - Lifetime

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