US3165948A

US3165948A - Method of rolling h-sectioned steel members and mill train for the same

Info

Publication number: US3165948A
Application number: US126191A
Authority: US
Inventors: Kishikawa Kanichi
Original assignee: Yawata Iron and Steel Co Ltd
Current assignee: Yawata Iron and Steel Co Ltd
Priority date: 1960-07-23
Filing date: 1961-07-24
Publication date: 1965-01-19
Anticipated expiration: 1982-01-19
Also published as: BE606422A; DE1299587B; GB993975A

Description

J 1965 KANICHI KISHIKAWA 3,165,948

METHOD OF ROLLING H-SECTIONED STEEL MEMBERS AND MILL. TRAIN FOR THE SAME 3 Sheets-Sheet 1 Filed July 24, 1961 FIG.

INVEN TOR.

Kanichi Kishikawa Jan. 19, 1965 KANlCHl KISHIKAWA 3,165,948

METHOD OF ROLLING H-SECTIONED STEEL MEMBERS AND MILL TRAIN FOR THE SAME Filed July 24, 1961 3 Sheets-Sheet 2 FIG. 3

INVENTOR.

Kanichi Kishikawa BY Jall- 1965 KANICHI KISHIKAWA 5 3,165,948

METHOD OF ROLLING H-SECTIONED STEEL MEMBER AND MILL TRAIN FOR THE SAME Filed July 24, 1961 5 Sheets-Sheet 5 FIG.5

INVENTOR.

Kam'chl' Kishikawa WM pm United States Patent 3 165,948 MET H61) 05' RQLLiNG H-SECTEUNED STEEL MEMBERS AND lvllLL TRAIN FUR THE SAME Kaniehi Kishiirawa, Tchata, Japan, assignor to Yawata iron it; Steel 12., Ltd, Tokyo, .i'apan Filed Iuiy 24, 1961, Ser. No. 126,191 Qlaims priority, application Japan, July 23, 1969, 35/323,579 1 Claim. (Cl. 8tl6s) This invention relates to a method of rolling H-sectioned steel members and a mill train for the same. More particularly it is to obtain H-sectioned steel members economically and accurately by a special arrangement of edgers and a universal rolling mill.

The prior art teaches methods of rolling H-sectioned steel members wherein a two-high or three-high section steel rolling mill is used and wherein a universal rolling mill is employed. The method of rolling H-sectioned steel members by using a universal rolling mill comprises steps wherein a steel ingot is bloomed and rolled, and is then formed into a blank having high flanges (height' from the web to the tip of the flange) by means of a breakdown rolling mill. The blank is then roughly rolled by means of a rolling mill consisting of a universal rolling mill and an edging roll provided adjacent to the front or rear of it and is finish-rolled by means of a finishing universal rolling mill to form the final product.

In the general section steel rolling system, that is, in the case of using a two-high or three-high section, steel rolling mill, the flange of the blank is required to be about twice as wide as the product. 0n the other hand, in the universal rolling method, the above mentioned disadvantage is correctedby the effective area reducing action of the universal rolling mill but it is desired that the flange of the product be substantially the same width as the blank for the ideal condition during rolling. That is to say, the flange of the blank may be narrow because it is easy to bloom and roughly roll the blank. However, in the conventional rolling system, this advantage has not been easily obtained, because of the disadvantage that, if the flange of the blank is made narrow in the edging roll, the clearance between the upper or lower surface of the web and the roll body surface will necessarily become large during the rolling process. That is to say, if the clearance between the upper or lower surface of the web and the roll body surface becomes large, the edging roll action for equalizing the flmges will be greatly impaired.

Therefore, the blank must be rolled so that the flanges may be wide. Thus, before the blank is provided by the breakdown rolling mill from an ingot, it will be difficult to mold the blank and ea considerable number of steps will be required for rolling. Further, in the rolling step in such conventional method, it has often occurred that the tip of the flange is rounded and that the tips'of the flanges offthe product are irregular.

As a result of research such defects of the conventional method have been eliminated by the present invention.

An object of the present invention is to provide a meth- 0d of manufacturing t l-sectioned steel members wherein a blank whose flange is substantially as wide as the flange of the product to be produced is used as a starting material and a horizontal edging roll is provided adjacent torthe front and rear of a universal rolling mill soas to. make it unnecessary to manufacture steel ingots of large there are provided passes with opposed horizontal edging rolls in which the depths from the roll body surface to the tip of theflange of the steel member are dilferentlor 3,155,948 Patented Jan. 19., 1965 are the same, said passes being adjacent to the front or rear of a' universal rolling mill. The horizontal edging rolls in the passes are so constructed as to be adjustable in the direction at right angles to the rolling line.

If passes in which the depths from the roll body surface to the tip of the flange of the steel material are different, are provided, the edging rolls provided in the front and rear of the universal rolling mill in the present invention will be able to better attain the object of the invention.

The other objects of the present invention will become clear from the following specification and claim, taken with the accompanying drawings, in which:

FIGURE 1 is a plan view of the arrangement of a universal H-sectioned steel member rolling equipment ac cording to the present invention.

FIGURE 2 is a perspective view of a rolling mill consisting of the horizontal edging roll arrangement according to the present invention.

FIGURE 3 is a series of sections through a rolling showing the relation among the dimensions of a horizontal edging roll in the arrangement of-the present in-,

vention, a blank steel piece and an intermediate product.

FIGURE'4 is a series of sectional views through the passes showing the rolling method according to the present invention.

FIGURE 5 is a diagrammatic comparison of the blank rolling methods between a conventional rolling method and the present invention.

According to the present invention, as described above, when two passes of horizontal edging rollers are arranged adjacent to the front and rear of a universal rough rolling mill, the rolling action will be stabilized and the rolling accuracy will be improved and, as .a larger effect, the width of the flange ofthe product and that of the flange of the blank will be able to be made substantially equal to each other. Therefore, with the already installed blank rolling equipment, wide flanged H-sectioned'steel blanks can be easily rolled. Further, accordingly, steel ingots of large cross-sections will become unnecessary and the kinds of steel ingots needed for the starting blanks will be fewer than heretofore. V

Further the material on the inlet side of the roughing universal rolling mill will be held accurately by the hOIi,

' zontal edging rolls and the rolling by the roughing or intermediate roughing universal rolling mill will be able to be accurately carried out. Also, as the later half edging is carried out by the horizontal edging rolls on the outlet side, the clearance between the edging roll body surface and the material will be able to be made small, the edging action will be carried out accurately and the difference of the dimensions of the product will be substantially nil.

Because the blank whose flange width is made sub-' stantially equal to the flange width of the product can be rolled as described above, an H-sectioned steel member' The present invention shall be detailed in the following 1 with reference to the drawings.

Shown in FIGURE 1 is;an embodiment of invention having a novel arrangement of edgers. In the method A, 1 is a blooming mill, 2 is a breakdown mill,

3is a universal rouging mill and 9 and 10 are horizontally positioned edgers arranged to the front and rear of the. universal roughing mill 3. 7 is a finishing universal mill. 'That is to say, in this mill train, the steel ingot is'bloomed andthe blank is formed bythe blooming mill ra g the;

the present" breakdown mill 2 and the blank is reciprocally rolled several times by the front horizontal edger 9 and the roughing mill 3 and by the roughing mill 3 and the rear horizontal edger 10. After the blank is thus roughly rolled, it is fed to the finishing roll 7 so as to be made with a finished product. In the method B, a universal roughing mill 3 having two horizontally positioned

edgers

9 and 19 in the front and rear and an intermediate rough-.

ing universal mill having a horizontally positioned edger 4 in the rear are arranged. In the method C, a universal roughing mill having horizontally positioned

edgers

9 and 10 in the front and rear and a universal finishing mill 9 having horizontally positioned edgers 11 and 12 in the front and rear are arranged in sequence. In the methods B and C, 1 is a blooming mill. In the methods D and E, a universal roughing mill 3 has, adjacent the front or rear, a horizontally positioned

edger

9 or 10 having parallel passes of different depths arranged to be properly shifted laterally of the rolling path. 7 is a universal finishing mill. 7

FIGURE 2 shows an arrangement of edging rolls having one of the features of the present invention. In the drawing the mill 3 comprises a set of horizontal rolls l3 and 14 rotating about horizontal axes in directions reverse to each other and a set of

vertical rolls

15 and 16 having vertical axes intersecting at right angles with the axesof the horizontal roll axes in the plane connecting said horizontal roll axes. The horizontal rolls are to be driven by a prime mover. The vertical rolls are to be driven by the reciprocating frictional motion of the steel member reciprocated by the drive of the horizontal rolls. These rolling mills are used chiefly in rolling H-sectioned steel members. The universal rolling mill 3 serves to press and reduce the web and flanges of the H-sectioned steel member. The

horizontal edgers

9 and 19 having horizontal edging rolls 19 and 20 and 21 and 22, respectively, rotatable about horizontal axes are placed adjacent to the mill 3 so as to'serve to roll and edge the tips of the flanges of the H-sectioned steel member in cooperation with the mill 3. That is to say, in FIGURE 2, adjacent to the intermediate roughing universal roller 3 are set

horizontal edgers

9 and 19, 9 being on the blank inlet side or in the front of the mill 3 and It) being on the finishing mill side or in the rear of the'mill 3. It is preferable that the roll depth of the horizontal edger 9 is smaller than that-of the horizontal edger 10 set in the rear of the universal mill. This point shall be explained. The roll of the horizontal edger 9 is so made that the depth (49 in FIGURE 3) from the roll body surface to the flange tip is smaller by 2;to. 3 mm. than the height from the upper surface of the blank web. to the flange tip. (This corresponds to the pressed and reduced amount necessary for rolling the material.) Further, it is effective that the roll depth (54 in FIGURE 3) of the horizontal edger 10 from the roll body surface to the flange tip should be smaller by 3 to 4 mm. than the height to the flange tip from the upper surface of the web ofthe ma terial coming out of the intermediate roughing universal roll after 'more than half the total number of passages for rolling the blank by the intermediate roughing universal rolls 3, for example, after 7 to 9 passages if the total number of passages by the intermediate'roughing universal mills is 11. (This corresponds to the rolled amount necessary for rolling the material.)

The blank will be surrounded by the horizontal edger 9, Will have the blank flange tip rolled and the dimensions of the flange parts accurately corrected, will be fed to the intermediate roughing universal mill 3, will pass through the mill 3,-will then turn, will return to the horizontal edger 9 andthen again tothe mill 3. Thus, the operation will be repeated several times. Meanwhile, the horizontal edging roll 10 will only guide the material but will perform no edging action. As the horizontal edger Ill 7 will thus perform the guiding action as described above, it

the blank has passed through the universal roughing mill 3 more than half the total number of passes, the edging operation will be moved to the horizontal edger It). In the first round of the horizontal edger it), the same action will take place as with the first round action of the horizontal edger 9. That is to say, in the first round of rolling passage through the horizontal edger it), the blank flange tip will be rolled and the dimension of the flange parts will be accurately corrected. In the final passage through the intermediate roughing mill, the horizontal edger 1% will guide the material accurately and will feed it into the finishing universal mill 7. Meanwhile, the edging rolls of the horizontal edger 9 will only guide the material but will perform no edging action. That is to say, the horizontal edger 9 will act as a guide and will serve for greatly improving the rolling operation.

FIGURE 3 shows the relation between the rolling passage through the horizontal edger 9 and the size of rough section steel piece rolled thereby and that between the rolling passage through the horizontal edger 10 and the size of an intermediate product.

In FIGURE 3, Q shows the size of rough section steel piece at the first round of rolling passage through the horizontal edger 9. Qm shows that at the m-th round of rolling passage through the horizontal edger 9. Qm-l-l shows that at the first round of rolling passage through the horizontal edger 1(3 and Q12 shows that at the n-th round of rolling passage through the horizontal edger 10.

In Q 48 .is the clearance between the horizontal upper and lower rolls at the place of the flange part, correspondnig to the flange width, 47 the clearance between them at the place of the web part, corresponding to the web thickness, 46 the web thickness of a final product and 42 the flange thickness. There exists the following equation:

In Qm, Stl shows the flange width at the mth round of rolling passage through the

horizontal edger

9, 51 the web thickness and 52 the clearance between the roll body surface and the web surface. The following equation between the dimensions will be found.

FIGURE 3 shows that according to the present invention, the roll depth of the horizontal edger 9 can be made small, and thereby the flange width of a blank can be made smaller than that of any conventional one, as seen from the Equation 1. That the roll depth 49 of the horizontal edger 9 can be made small is due to the edging rolling being divided into the two stages, i.e. the

horizontal edgers

9 and 10. As the web thickness 51 may be larger than that of a final product 46, the roll depth 49 will become small, as seen from the Equation 2. It is also clear that the larger the

clearance

52 or 53, the smaller the roll depth.

. mediate product have been determined by the standard dimensions of a final product in design. Therefore, the roll depth of an edger must be large and thereby a blank of wide-flange is required. If the flange width of a blank.

is larger than the flange dimension of the same product, the thickness ofthe blank will-be thinner inthe design of the material. Therefore, the flanges of the blank will have to be rolled so as to have a thin long shape. This will prove a great disadvantage in rolling.

One of the objects of the present invention is to make even a blank of a small flange width rollable precisely. In order to obtain a blank whose flanges are thin and wide, a steel ingot of a cross-section larger than for obtaining a .blank whose flanges are thickand narrow will be required .in rollingand edging and the number of rolling V passages will increase. Further, the blank flange'will be so'high that the width of thevertical roll of the universal mill will increase and the diameter of thehorizontal roll fitting thereto will become larger. In the blooming roll and roughing roll, too, larger roll diameters will be required.

According to the present invention, as in FIGURE 1, part C, two pairs of horizontal edgers, 9 and and 11 and 12, are arranged adjacent and in front of and to the rear of the universal rolling mills 3 and '7, respectively, so that, while satisfying the size of the clearance required in rolling, the depth of the horizontal edging roll may be made smaller than when arranging one horizontal edger as before, and the blank flange width may be made smaller than ever.

In FIGURE 4 is shown an embodiment of the rolling process according to the present invention.

Horizontal edgers

9 and 10 are arranged in front of and to the rear of the universal mill 3 and a finishing universal mill 7 is arranged at a point spaced from the universal mill '7.

The small digits attached to the numerals represent the progress of the passage of the blank through the mills.

In 9 the roll body surface will come into contact with the material web. In 9 after several passages, a clearance 55 will be produced. Here the edging action will be transferred to the rear edger 10. In the first passage 10 the roll body surface will be in contact with the material Web. After several passages, a clearance 56 will be produced. The clearances 55 and 56 are of such sizes that they will not interfere with the edging action. As already described, the roll depth (49 in FIGURE 3) of the edger 9 can be made smaller than when one edger as before 7 is a finishing passage.

FIGURE 5 shows the rolling of the blank as compared with the conventional method.

In the arrangement of the rolling mills according to the present invention, since two horizontal edgers are provided so as to function as two roughing and intermediate roughing rolling mills, the blank to be fed to the universal rolling mill may be of a large cross-section. Therefore, the breakdown mill may be of an open pass type and several passes can be provided on one roll; As the conventional rolling mill is nothing but a function of one intermediate roughing mill, is is necessary to feed a blank of a thinner cross-section in which pressing and reduction have progressed so far as to include the part normally performed by the roughing universal mill. It is so difiicult to roll the thinner part having the shape of a wider flange that a closed pass is required for edging. Thus, only one kind can be arranged in the breakdown.

In FIGURE 5, 2 shows a conventional breakdown mill with only one closed pass (a) and 2' a breakdown mill according to the present invention with passes of three kinds, ([1), (b) and (c).

According to the conventional method, a blank which passed a blooming mill 1 in the direction as shown with an arrow, passes a pass (a) of a breakdown mill 2 several times (seven times as shown in the figure) and then reaches a universal mill 3. The use of a closed pass makes it possible to press a blank thinly but has the following disadvantages: Only one kind of pass can be used for the roll. As a closed pass requires a collar 57 which is not required for an open pass, the collar diameter becomes that much larger. When thecollar diameter is larger, a larger roll manufacturing capacity will be required, the structure of the rolling mill housing will become larger and the minimum diameter of the partner roll in the collar part will be smaller, reducing the strength of the latter.

On the other hand, according to the present invention, a blank which passed a blooming mill 1 in the direction as shown with an arrow, passes selectively three passes (a), (b) and (0) several times (three t'nnes as shown in the figure) and then passes through a horizontal edger 9, a universal mill 3 and a horizontal edger 10 and reaches to a finishing mill 7. As two edgers are provided in front of and to the rear of a universal mill, it is not necessary to use a breakdown roll with a closed pass. Though the reduction by rolling through an open pass is smaller than through a closed pass, this deficiency in reduction can be covered by two horizontal edgers in the latter stage and several drawbacks accompanied by the use of a closed pass in the conventional breakdown roll as above mentioned will be eliminated by the use of an open pass. Thus, the arrangement of two horizontal edgers according to the present invention can afford the benefit already in the stage of preparing a blank.

The embodiments of the rolling mill train according to the present invention have been explained in the above. However, the technical idea of the present invention includes the below mentioned modification of the rolling mill train. For example, in the method A in FIGURE 1, though the universal roughing mill provided with horizontal edging rolls in the front and to the rear has been explained, two universal roughing mills may be arranged in parallel and edging rolls may be arranged in the front of and to the rear. Likewise, where there are provided two universal roughing mills arranged parallel to each other, a horizontal edging roll may be further provided between them and horizontal edging rolls may be provided in front of and to the rear of said parallel universal roughing mills. 7

Further, in the above described modified rolling mill train, the shifting mechanism for shifting the horizontal edging rolls in methods D and E of FIG. 1 may be applied to the horizontal edging rolls.

What I claim is:

A method of rolling H-sectioned steel members with a rolling mill train, said rolling mill train comprising a universal rolling mill, an anterior horizontal edging mill and a posterior horizontal edging mill, comprising the steps of (l) rolling said steel member between the universal mill and the anterior edging mill and passing the steel member through said posterior edging mill, said universal and anterior mills operating in synchronization for reducing and shaping the steel member and said posterior edging mill only guiding the steel member during the rolling operation, for at least one-half of the total rolling steps, and

(2) rolling said steel member between the universal mill and the posterior edging mill and passing the steel member through said anterior edging mill, said universal mill and posterior mills operating in synchronization for reducing and shaping the steel member and said anterior edging mill only guiding the steel member during the rolling operation, for the remainder of the rolling steps.

References Cited by the Examiner UNITED STATES PATENTS 1,025,078 4/ 12 Vassen 66 1,812,246 6/31 Oberg 80-66 1,930,410: lO/33 Baugnee 8Q-35 WILLIAM J. STEPHENSON, Primary Examiner.

CHARLES W. LANHAM, LEON PEAR, Examiners.