JPH0367441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for widening the inner width of a section steel web having a flange.

[Prior Art] FIG. 9 is a diagram showing a conventional universal rolling method for H-beam steel. For example, when manufacturing H-section steel using a universal rolling mill, a rough-shaped steel piece that has been roughly formed using a breakdown mill (not shown) is rolled into a web using horizontal rolls 31 of an intermediate universal mill as shown in Fig. 9A. At the same time, the side wall of the horizontal roll 31 and the vertical roll 32 roll the flange. The end portion of the flange is rolled using an edger roll 33 of an edger mill shown in FIG. 9B. FIG. 9C shows a finishing universal mill, which performs finishing rolling after being rolled several times in an intermediate universal mill or an edger mill. In this universal rolling method, the web is stretched in the rolling direction.
The rolling process shown in FIG. D for enlarging the web inner width W or adjusting the inner width dimension is not performed. That is, H to be manufactured
When changing the web width W of a section steel, rolling is performed by replacing each horizontal roll with another horizontal roll that matches the web width W of the rough section steel piece or H section steel. In a section steel rolling factory, many types of H sections with different W dimensions are manufactured, but the work of rearranging the horizontal rolls each time the W dimension changes is extremely cumbersome, and it is necessary to keep a large number of horizontal rolls on hand. It will be done. H for circular pressure
Regarding the method of not changing the horizontal roll even if the inner width W of the web of the section steel changes, the techniques disclosed in Japanese Patent Application Laid-open No. 53-84856, Japanese Patent Application Publication No. 83961-1983, and Japanese Patent Publication No. 58-57244 are known. In this method, the inner width W of the web is stretched by pulling and stretching the web in the direction of the flange at the stage of forming a rough shaped steel piece or during an intermediate finishing process. However, although this method is suitable for slightly increasing the inner width of the web, it has the problem that the web tends to stretch locally and the thickness of the web tends to vary, as will be described later. Another method for changing the inner width of the web is disclosed in Japanese Patent Application Laid-open Nos. 133902/1982 and 178101/1982. That is, in the middle of rolling, an extra thickness 35 shown in FIG. 10A is formed on the web by rolling, and then this extra thickness is flat rolled to form the
It expands the web as shown in Figure B. However, since the partial rolling of the excess thickness portion 35 in this method involves metal flow in the rolling direction of the excess thickness portion, the web surface corresponding to the excess thickness portion tends to become wavy after rolling.
In addition, in this method, the width of the web corresponds to the amount of excess thickness in the excess thickness section, so it is important to accurately form the amount of excess thickness in order to ensure the dimensional accuracy of the inner width of the finished product. Rolling to form a stable and accurate amount of extra thickness each time the H-beam changes is difficult with a universal mill.

[Problems to be solved by the invention] The present invention allows the inner width of the web to be easily changed.
Moreover, the object is to manufacture a section steel having a flange, in which the thickness of the web can be maintained uniformly.

[Means for Solving the Problems] FIG. 1 is an explanatory diagram of a first apparatus of the present invention, and is a diagram showing a cross section perpendicular to a pass line of a traveling section steel. The unit shown above the traveling section steel 11 in FIG. 1 is the upper roll unit.

The upper roll unit of the present invention will be explained based on FIG. In the present invention, the piece-shaped roll means 4 in Fig. 1.
-1, the bottom surfaces of two truncated cones, the upper truncated cone whose truncated conical surface is h ₁ and the lower truncated cone whose truncated conical surface is f ₁ , are joined to each other. It is a so-called soroban bead-shaped roll.

The upper roll unit of the present invention comprises a rolled section 11
It has left and right piece-shaped rolls 4-1 and 4-2, which are symmetrically arranged with respect to the center of the pass line, with their axes tilting inward as shown in FIG. Further, there is provided a single back-up roll 6 with a horizontal axis which is provided above the left and right piece-shaped rolls 4-1 and 4-2 and supports the backs of the rolls 4-1 and 4-2. 4-1, 4
-2 and 6 axes are on the same plane perpendicular to the pass line of the rolled section. Each roll is provided on a roll chock 1 so as to be rotatable about its respective axis. In addition, the edges P ₁ −P 1 ′ and P ₂ − of the lower end of the lower truncated conical surfaces f ₁ and f ₂ of _the left and right piece-shaped rolls
P ₂ ′ is horizontal and arranged at the same height, and the upper edge of the upper conical surface h ₁ and h ₂ of the left and right piece-shaped rolls is q ₁ −
q ₁ ' and q ₂ -q ₂ ' are arranged along the roll surface of the backup roll 6. Figure 1 shows roll chock 1 (1-1 part) and roll chock 1 (1-2 part).
Part) is an example of an integral roll chock that surrounds the piece-shaped rolls 4-1, 4-2 and the back-up roll 6 and is connected at the front of the paper. 1-1 of the roll check
This is an example in which both ends are supported by the part 1-2, but the roll chock does not have the part 1-2, and the piece-shaped rolls 4-1 and 4-2 have only one end supported by the roll chock. It may be a piece-shaped roll supported by 1-1 parts.

When the above-mentioned upper roll unit is pressed against the upper surface of the traveling section steel 11 as shown in FIG. contacts the inner surface of the flange and the web on the upper surface of the section steel having the flange, thereby widening the inner width of the web.

The unit shown below the traveling section steel 11 in FIG. 1 is the lower roll unit. The lower roll unit is arranged vertically symmetrically with the upper roll unit with respect to the traveling section 11, and the left and right piece-shaped rolls, back-up rolls, and roll chocks are also arranged vertically symmetrically with those of the upper roll unit.

The present invention includes a manufacturing apparatus having an upper roll unit and the lower roll being a normal horizontal roll, or a manufacturing apparatus having a lower roll unit and the upper roll being a normal horizontal roll, or a manufacturing apparatus having an upper roll unit and a lower roll unit. This includes manufacturing equipment having.

FIG. 8 is an example of manufacturing a section steel having a flange only on the upper surface. In this case, the traveling section steel can be made to travel between the upper roll unit and the lower horizontal roll, thereby increasing the inner width of the web. Although not shown, when manufacturing a section steel having a flange only on the lower surface, the running section steel can be made to run between the horizontal upper roll and the lower roll unit to increase the inner width of the web. Further, in the case of manufacturing a section steel having flanges on the upper and lower surfaces as shown in FIG. 1, the running section steel can be made to run between an upper roll unit and a lower roll unit to increase the inner width of the web.

FIG. 2 is an example of the second apparatus of the present invention, and is a diagram showing a cross section perpendicular to the pass line of the traveling section steel.
That is, FIG. 2 further includes a horizontal work roll 9 with a cylindrical roll surface inside the left and right piece-shaped rolls, and the horizontal work roll has a lower end r ₁ -r ₂ of the roll surface at the first
The upper roll unit is rotatably installed on the roll chock 1 at the same height as the edges P ₁ -P ₁ ′ and P ₂ -P ₂ ′ mentioned in the figure, and the lower roll unit is attached to the moving section steel 11. This is an apparatus for manufacturing a section steel having a flange, which is the same as described in the first apparatus of the present invention, except that the lower roll unit is vertically symmetrical to the upper roll unit.

When this device is used, the left and right piece-shaped rolls and back-up rolls press against each other, bringing the piece-type rolls into contact with the inner surface of the flange of the section steel having flanges and the web, thereby widening the inner width of the web. 9 abuts against and rolls the web of the section steel having flanges, and as will be described later, the web rolling of the horizontal work rolls 9 makes it easier to widen the inner width of the web.

FIG. 3 is a diagram showing a third example of the device of the present invention. That is, the back-up roll 6 is a back-up roll having a symmetrical conical surface that tapers toward the end of the roll. The embodiment is such that the left and right piece-shaped rolls 4-1 and 4-2 are arranged on the left and right movable roll jocks 1a and 1b, respectively. This apparatus is the same as that described in the first apparatus, and is a manufacturing apparatus for a section steel having a flange.

When this device is used, the left and right piece-shaped rolls and back-up rolls press against each other, causing the piece-shaped rolls to come into contact with the inner surface of the flange of a section steel having flanges and the web, thereby widening the inner width of the web. Since the conical surface is interposed between the piece-shaped rolls 4-1 and 4-2, the inner width of the web can be efficiently widened, as will be described in detail later.

[Operations and Examples] Fig. 4 is a schematic diagram showing the operation of the present invention, in which Figure A is a schematic front view seen from the rolling direction in the direction of arrows E-A, and Figure B is a schematic plan view of Roller in the direction of arrows. It is. In the figure, a indicates the upper surface of the piece-shaped roll 4, b indicates its maximum diameter surface, and c indicates its lower surface, and the diagonal lines indicate H-section steel. The b side of the piece roll first contacts the inner surface of the flange of the H section at point d, and as the piece roll rotates (the H section moves forward), the point d on the piece roll reaches point e, and the H section The inner width of the web is increased from l ₁ to l ₂ . At this time, in Figure 4B, d
The web between -d' and ee-e' is stretched in the flange direction as the web widens, but tensile stress alone causes the web to stretch locally and the thickness of the web becomes uneven. easy.

In the present invention, the conical surface f formed between the b-plane and the c-plane of the piece-shaped roll presses the web portion adjacent to the flange in the web thickness direction during the process of widening the web in the first half. Further, reference numeral 9 in the figure indicates a horizontal work roll, which presses the center portion of the width of the web in the direction of the thickness of the web during the process of widening the web.

In general, the amount of expansion ΔW is determined by the geometrical positional relationship between the roll and the material, and the components of the amount of expansion separated by the expansion mechanism are expressed as shown in the following equation.

Width expansion amount ΔW = Width expansion amount due to excess thickness reduction + Width expansion amount due to surplus thickness stretching + Width expansion amount due to web stretching other than the excess thickness Here, as the stretching width increases, the web thickness becomes uneven. , a constriction occurs in the cross section, and if the stretching width is further increased, the web will break. On the other hand, if the web width is expanded only by reducing the excess thickness, metal flow occurs in the rolling direction in the excess thickness reduction area, and the web surface, which is restrained from stretching in the rolling direction, tends to buckle and become wavy. When stretching and widening and reducing extra thickness are performed simultaneously using the piece roll 4 and the horizontal work roll 9 as in the present invention, the stress acting on the inside of the material due to the stretching action and the stress acting on the inside of the material due to the extra thickness reduction action are reduced. Since they are mutually balanced, deformation is smooth and the web thickness is uniform. Furthermore, as an accompanying effect, there is no problem of abnormal material deformation or surface flaws caused by widening, and the load and processing energy required for width widening are reduced.

In Figs. 1 and 2, an example is shown in which an extra wall portion 10 is provided as a dotted line on the web adjacent to the flange, and in Fig. 4, an extra wall portion 10 is provided in the center of the web. This is useful, and the widening process is performed even more smoothly.

Figure 5 is a diagram showing an example of the effect of the present invention.
It shows the deviation in web thickness when the inner width of the web is expanded using H-beam steel of H250 x 90 x 5/9. Line B in the figure is an example in which the web is stretched in the flange direction using the known width expanding device shown in B.
As the width increases, the deviation in web thickness increases and the web thickness becomes non-uniform. Line A in the figure shows the pressure applied to the web in the thickness direction, and even if the inner width of the web increases, the deviation of the web thickness is small and the thickness is kept uniform.

Figure 6 shows another embodiment in which the maximum diameter surface of the piece-shaped roll is made close to horizontal, and the piece-shaped roll first contacts the flange portion closer to the web, and the component force in the width direction becomes larger. .

The dotted line in FIG. 6 is an example showing a method of bringing the circumferential speed of the roll surface of the back-up roll 6 closer to the circumferential speed of the roll surface of the piece-like roll 4 at the contact part g between the piece-type roll and the back-up roll. By selecting the diameter of the upper roll 6 so that the axis is F-F', the circumferential speed of each roll surface approaches, reducing friction between the rolls and reducing the amount of roll wear.

FIGS. 3 and 7 show examples in which the backup roll 6 is inserted between small-diameter piece-shaped rolls 4-1 and 4-2. If the back-up roll is configured to be movable in the vertical direction and the piece-shaped roll can be moved in the left-right direction, even if the internal width of the H-beam changes, the vertical position of the back-up roll and the left-right position of the piece-shaped roll can be changed. This can be handled by adjusting the Furthermore, with such a configuration, even if wear occurs in the piece-shaped roll and the back-up roll, it is possible to cope with the problem up to a certain range by inserting the back-up roll more deeply.

Although the present invention has been described in detail in connection with the production of H-section steel, the present invention can also be used as a device for widening the inner width of the web of a section steel having other flanges. 8th
The figure shows an example in which the present invention is applied to a section steel other than H-section steel, where A and B are channel steel, and C is an example of U-section steel sheet pile.

The device of the present invention may be used as an independent device, but it is also preferable to use it in a shape steel manufacturing line, for example, between a universal mill and an edger mill in a universal type shape steel rolling line. . The upper and lower roll yoke 1 is attached to a fixed housing or frame (not shown), and the interval between the upper and lower rolls is maintained at a predetermined position with high rigidity so as to be vertically movable. When such a manufacturing apparatus of the present invention is used in a row of rolling apparatuses that perform reverse rolling, the roll chock 1 is vertically moved in the middle pass.
is opened and set in a predetermined position in the final pass for widening rolling. As the structure for moving up and down, a well-known means such as a hydraulic cylinder or a screw system may be used. Further, when each roll stand is used in a row of continuous rolling equipment that continuously rolls in one pass, the housing or the frame may be configured as an integral upper and lower frame. Furthermore, since the apparatus of the present invention can be made small and compact, it is also preferable to use it as a guide for a section steel rolling line in the form of a cassette that can be easily attached and detached. Further, when a plurality of devices of the present invention are connected and arranged in a pass line, the inner width of the flange is expanded multiple times, so that a large width can be achieved.

When each roll is not driven, the device of the present invention is installed, for example, between the edger mill and the universal of the universal rolling equipment row, and when the tip of the material is pushed into the device of the present invention, the push-in device of the mill located in the previous stage of the device of the present invention is used. After the rear end of the material has kicked out the front mill, the pulling force of the rear mill can be used.

[Effects of the Invention] As is clear from the above explanation, by using the device of the present invention, the inner width of the web of a section steel having a flange can be expanded with uniform web thickness and dimensional accuracy using piece-shaped rolls. . Further, the apparatus of the present invention can be manufactured in a small size and can be easily replaced when installed in a rolling line, so that even if the dimensions of the shaped steel to be manufactured change, it can be easily and quickly adapted.

[Brief explanation of drawings]

1 is a diagram of a first example of the device of the present invention, FIG. 2 is a diagram of a second example of the device of the present invention, FIG. 3 is a diagram of a third example of the device of the present invention, and FIG. 4 is a diagram of the present invention. FIG. 5 is a diagram showing an example of the effects of the invention; FIG. 6 is a diagram showing another embodiment of the invention; FIG. 7 is a diagram showing another embodiment of the invention. , Fig. 8 is a diagram showing an example in which the present invention is applied to a section steel other than H-section steel, Fig. 9 is a diagram showing a normal universal rolling method, and Fig. 10 is a diagram showing an example of conventional technology. .

Claims (1)

[Claims] 1. Left and right piece-shaped rolls 4 (4-1, 4-2) whose axes are arranged symmetrically with respect to the center of the pass line of the traveling section steel 11 with their respective axes inclined inward. and,
It has a single back-up roll 6 whose axis for backing up the left and right piece-shaped rolls is horizontal, and the axis of each roll is on the same plane perpendicular to the path line of the running section steel. The rolls can be freely rotated with each axis as the central axis of rotation.
The lower truncated conical surface of the left and right piece-shaped rolls
The ridges P _{1 −P 1} ′ and P ₂ −P ₂ ′ at the lower ends of f ₁ and f 2 are horizontal and at the same height, and the upper truncated conical surfaces of the left and right piece-shaped rolls
The ridges q _{1 - q 1} ′ and q ₂ - _{q 2} ′ at the upper ends of h 1 and h ₂ are the shape of the section steel 1 that has an upper roll unit arranged along the roll surface of the back-up roll, or that is running.
It has an upper roll unit and a lower roll unit configured vertically symmetrically with respect to 1, or it has both the upper roll unit and the lower roll unit, so that the left and right piece-shaped rolls and back-up rolls are pushed against each other. A manufacturing apparatus for a sectioned steel having flanges, characterized in that the left and right piece-shaped rolls are configured to abut the inner surface of the flange of the sectioned steel having the flange and the web to widen the inner width of the web. 2 The upper roll unit connects the left and right piece-shaped rolls 4
It further has a cylindrical horizontal work roll 9 inside, and the lower end r ₁ - _{r 2} of the roll surface of the horizontal work roll is the ridge _P 1 of the lower end of the lower conical surface f ₁ , f ₂ of the left and right piece-shaped rolls.
The upper roll unit is rotatably installed on the roll chock 1 at the same height as P ₁ ′ and P ₂ −P ₂ ′, and the lower roll unit is attached to the traveling section steel 11.
The apparatus for manufacturing a section steel having a flange according to claim 1, wherein the lower roll unit is vertically symmetrical to the upper roll unit. 3. The back up roll 6 has a symmetrical conical surface that tapers toward the end of the roll, and the conical surface is inserted between the left and right piece-shaped rolls and arranged on a roll chock 1c that can be moved up and down. 2. The apparatus for producing a shaped steel section having a flange according to claim 1, wherein the left and right piece-shaped rolls are piece-shaped rolls respectively arranged on roll jocks 1a and 1b that are movable left and right.