JPH02169105A - Method and device for rolling irregular shaped section bar - Google Patents

Abstract

PURPOSE:To spread a rolled stock with generation of no camber and no corrugation by rolling both sides of the stock toward respective outside inclined directions by two pairs of upper and lower rolls whose respective axial lines are slanted at a prescribed angle to the horizontal direction and whose central side ends facing to each other are in the rolling direction. CONSTITUTION:Both lateral sides of a strip-shaped rolled stock P are rolled by two pairs of upper and lower rolls 2, 3 installed in bilateral symmetrical positions and to have a prescribed gap between their central parts to reduce a stock thickness into a prescribed one and to form a special section bar having an embossed part in the sectional central part. Both sides of the stock P are rolled in respective outside inclined directions by two pairs of upper and lower rolls whose respective axial lines are slanted at a prescribed angle to the horizontal direction and whose central side ends facing to each other are in the rolling direction. Material in both sides flows in respective both side edge directions having less resistance and both sides are elongated in the rolling direction and are spreaded in both side edge directions with generation of no camber and no corrugation. Thus, a special section having an embossed part in the central part is formed by one rolling.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for rolling a strip of irregular cross section, and more particularly to a rolling method and apparatus suitable for forming a strip of irregular cross section having a convex portion at the center of the cross section. be.

[Conventional technology]

-Flu, as methods for forming irregular cross-section strips, there are known methods such as a cutting method, an IVr subsequent forming method using a square die and a flat roll, and a rolling method. However, the cutting and forming method generates cutting waste, resulting in a large amount of material loss, while the interrupted forming method using a V-shaped die and flat roll does not generate cutting waste and allows a large flow of material in the radial direction. Although it has the advantage that it can be molded into a predetermined shape in one step, it has the disadvantage that production efficiency is low because the molding is performed intermittently.

On the other hand, although the rolling method does not generate cutting waste and can be expected to have high production efficiency, when forming irregular cross-section strips,
- If a large reduction is applied during rolling, there will be a large difference in the elongation of each part of the cross section in the rolling direction, causing warping and waving in the rolled material.
There is a problem in that it is necessary to repeat rolling several times while adding an annealing process midway through.

Therefore, in order to eliminate the problems with the above-mentioned rolling method and form irregular cross-section strips with high production efficiency, various studies were added to these methods, and for example, as shown in Figure 6 a, the final A material strip (61) having a cross section with a thickness ratio that is approximately the same as the thickness ratio of each section of the irregular cross section strip (62) during molding.
is formed by extrusion processing, and this material strip (61) is formed into the sixth
A pair of grooved rolls (63) and (64) as shown in Figure b
) (Japanese Patent Application Laid-Open No. 55-88942)
, ■ As shown in Figures 7a and 7s, a pair of upper and lower dies whose shapes are gradually changed so that the forming progresses sequentially in the rolling direction while forming a flow of material in the width direction. A method has been proposed in which a plurality of pairs of rolls (71) and (72) are arranged in the rolling direction, and a plate to be formed (73) is continuously formed by a group of these rolling rolls (Japanese Unexamined Patent Publication No. 55-88943).

[Problem to be solved by the invention]

In order to form a relatively thin irregular cross-sectional strip having a convex portion in the center of the cross section, which can be used as a material for the reed fly 1, etc., with high production efficiency, the sweat of the present invention is different from the conventional irregular cross-sectional strip described above. A detailed study of rolling methods for cross-sectional strips revealed that these methods had the following problems.

■The material strip formed by extrusion processing is processed using a grooved roll.
In the double rolling method (Japanese Unexamined Patent Publication No. 55-88942), there is no warping or corrugation during the final rolling.
Although it can be formed with high precision, it requires extrusion processing equipment in addition to the rolling equipment S, which increases equipment costs and management costs. It is not easy to do this, and the resulting +4 strips are relatively thick, so it took several times to form them into thin, irregular cross-section strips; [h postponement i
Furthermore, since there is a restriction on the unit length in extrusion T, it is not possible to obtain a material strip long enough to efficiently carry out the rolling process after m, and as a result, the processing There is a problem that the number of man-hours and costs increase.

In addition, (1) a method of arranging a plurality of pairs of upper and lower die rolls in the rolling direction and rolling with these rolling roll groups (Japanese Unexamined Patent Application Publication No. 1986-55
88943) can be efficiently formed by a series of rolling steps, but in order to form the desired thin-walled irregular cross-section strip while suppressing the occurrence of warping and corrugation, the shape of each strip was changed little by little. Because it is necessary to arrange a large number of upper and lower die roll pairs and roll stands, the equipment becomes large-scale, and the required installation costs, roll production costs, and management costs increase. However, there is a problem in that the processing cost increases.

In view of the above-mentioned problems, the present invention is capable of forming a relatively thin irregular cross-sectional strip having a convex portion at the center of the cross-section by - times of rolling without causing any warping or waving, thereby improving production efficiency. The object of the present invention is to provide a method and equipment for rolling a strip of irregular cross-section, which can reduce the equipment cost and processing man-hours.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following features. That is, (1) the method for extending the irregular cross-section strip of the first invention is to provide the strip at a predetermined interval in the center and symmetrically on the left;
Each axis is tilted at a predetermined angle t1 in the horizontal direction,
Rolling is performed on both sides of the strip-shaped material to be rolled in the width direction using the upper and lower rolls with their opposing center ends facing in the rolling direction. The thickness of both sides is reduced to a predetermined thickness while being widened in the direction of both side edges.

The method of rolling a strip of irregular cross-section according to the second aspect of the invention includes, in addition to the above-described rolling method, further performing final finish rolling using grooved rolls.

The rolling apparatus for irregular cross-section strips according to the third invention includes a pair of roll stands erected on the left and right sides, each of which is cantilever-supported with its axis rotatable in the horizontal direction, and It is equipped with an upper T rolling roll and an upper T rolling roll.

(Function) In the method for rolling a strip of irregular cross section according to the first invention, the central portion ζ
The upper and Tm pair of rolls, which are arranged symmetrically with a predetermined interval apart, roll both sides of the strip-shaped material to be rolled in the width direction to reduce the thickness to a predetermined thickness. The material to be rolled can be formed into an irregular cross-sectional strip having a convex portion at the center of the cross-section.

In addition, both sides of the material to be rolled are rolled diagonally by two pairs of upper and lower rolls whose axes are inclined at a predetermined angle in the horizontal direction, and whose opposing central ends face the rolling direction. Since the material t:I on both sides is rolled toward the outside, the material t:I on both sides is flowed toward both side edges where the resistance is lower, and is rolled toward both side edges without extending in the rolling direction and causing warping or waving. It will be widened.

The angle at which the axis of each of the upper and lower two pairs of rolls is inclined in the horizontal direction varies depending on the width, thickness, material, etc. of the material to be rolled, but this angle is 15 degrees or more,
It is desirable to set the angle within a range of less than 45 degrees.The reason is that when the angle is less than 15 degrees, the extension of both sides of the material to be rolled in the rolling direction is large, causing extreme warping, waving, etc. of the material to be rolled. This is because the m-thread of rolling becomes impossible, and if the angle is 45 degrees or more, it becomes difficult or impossible to get the material to be rolled between the upper and lower rolls.

In the method for rolling irregular cross-section strips of the second invention, in addition to the above-mentioned rolling method, final finish rolling is performed using slotted rolls, so that the cross-sectional shape of the material to be rolled can be adjusted by this final finish rolling. In addition, the finished shape can be corrected by applying equal rolling to each section of the cross-section, or by applying more rolling to the cross-sectional sections that have less extension in the rolling direction.

In the rolling apparatus for irregular cross-section strips of the third invention, the lower rolling rolls are cantilever-supported and provided in pairs in the vertical direction on the pair of roll stands 1' erected on the left and right sides, respectively. In other words, the upper and lower rolling rolls are arranged in half Jl+ on the left and right, so these upper and lower rolling rolls are positioned symmetrically in the center with a predetermined interval apart, and the upper and lower rolling rolls By the lower rolling roll,
Rolling can be performed by applying pressure to both sides in the width direction of a strip-shaped material to be rolled. In addition, these upper and lower rolling rolls are cantilever-supported by the left and right roll stands so that their axes can rotate in the horizontal direction, so that the opposing center ends can be rotated horizontally in the rolling direction. It can be tilted about 1 to the angle of angle a.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

J - Cliff example 1 [jJa is a front sectional view showing the main parts of the rolling apparatus of this embodiment, and FIG. 1 is a Δ-A sectional view of FIG. 1a.

In FIG. 1a and FIG. 1S, (]) and (1') are roll stands, and these roll stands! '(
1). (1'') are erected in pairs on the left and right sides of the rolling work section, and are movable toward or away from each other via stand guides (9).

(2) is the upper roll, (3) is the lower roll, and the upper and lower rolls (2) and (3) are the roll stand (1
). (1") are cantilever-supported via a chock (4) and a chock receiver (5), and are arranged in pairs in the vertical direction. Also, each chock receiver (5) is
Through guide play [(6), roll stun l-'(
1) (1°), -1-1ζ movably mounted.

The lower roll (3) is connected to a motor (not shown) via a drive shaft.

(7) is a pressurized cylinder, and the pressurized cylinder (
7) is equipped with a hydraulic screw that pressurizes and raises the chock receiver (5) of the lower roll (3), and the roll stand (1)
(1゛) are provided at the bottom of each. (8) is a balance cylinder, and the balance cylinder (8) is a balance cylinder.
) are arranged in pairs between the upper and lower chock receivers (5) of the roll stands (+) and (1'), respectively.

On the other hand, each chock receiver (5) is marked A-A in Figure 1.
As shown in Figure 2a, which is a cross-sectional view, and Figure 2, which is an AΔ cross-sectional view of Figure 2a, the upper and lower inner surfaces are parallel to the horizontal direction, and the left and right inner surfaces are curved surfaces consisting of concentric circular arcs. An inner hole is provided, and each chock 4) has a cylindrical shape with four gear-shaped parts arranged at equal angles on the outermost periphery and a roll shaft bearing provided in the horizontal direction; It is fitted into the inner hole of the chock receiver (5) so as to be rotatable in the horizontal direction. In addition, on the inner peripheral surface of the hollow part of the chock receiver (5), there are four lock holes G with different angular phases.
[D is provided in the vertical direction, and these lock holes (101
By driving a fixing wedge (11) into either of the two, the chock (4) can be fixed at any rotation angle.

In the rolling apparatus of this embodiment, as shown in FIG.
1) An unwinding machine 02) is installed on the input side of (1°) and a winding machine 0■ is installed on the exit side to enable continuous long rolling.
In addition, deflex rolls 04, 05) are provided at the front and rear of the roll stand, respectively, to apply tension to the rolled material during rolling.
) and (1°), a pair of guide rolls 0ω were provided to press both side edges of the material to be rolled to prevent it from meandering.

A rolling machine having the above-mentioned configuration was used to roll a pure A1 blank sheet with a width of 50-steel and a thickness of 1.20 mm.
By using a strip (JIS: A1050P) and varying the angle of inclination of the upper and lower rolls in the rolling direction, an irregular cross-section strip P having a convex portion on the upper surface side of the center of the cross section was formed.

At this time, the length of the upper roll (3) is 20II1111, the length of the lower roll (3) is 25mm, and the diameter of each is 35mm.
mm, and left and right roll stands (1). (1'
Adjust the distance between 12 mm and 3 mm so that a 25+w+m wide unrolled part is left in the center of the upper surface of the rolled material, and 12 mm wide on both sides of the unrolled part.
The 5+ nm width was thinned in one bath to a thickness of 0.8 mm, and formed into an irregular cross-sectional strip P having a convex portion at the upper center of the cross section.

The reason why the lower roll is made longer than the upper roll is to make the lower side of the cross section of the irregular cross-section strip P flat. , upper and lower rolls of equal length are used.

Below, these rolling results will be described.

In an example where the inclination angle of the upper and lower rolls in the rolling direction is set to zero, as shown in Fig. 4a, which is an explanatory diagram, both sides of the material to be rolled extend greatly in the rolling direction, and the rolling input is Side part F4. : Extreme buckling occurs and the rolling distance is 15Il11
In addition, in an example where the inclination angle θ is 7.5 degrees, buckling occurs at the rolling entry side F at a rolling distance of about 501 degrees, making it impossible to continue rolling. Ta. (11) In the example in which the oblique angle θ was 15 degrees, rolling could be completed to the end without stopping halfway, but the obtained irregular cross-section strip was as shown in Fig. 4, which is an explanatory diagram. Relatively large undulations were observed in the thinned areas on both sides.

On the other hand, an example in which the inclination angle θ is 30 degrees and an example in which the inclination angle θ is 30 degrees
In the example where the rolling angle was 7.5 degrees, smooth rolling was possible, and the obtained irregular cross-sectional strip had a good shape that was almost flat, as shown in Figure 4C, which is an explanatory diagram. , and the widening ■Δβ (dimension expansion in the board width direction on one side with respect to the original board width) of the thin parts on both sides was also satisfactory.

From these results, the inclination angle θ of the upper and lower rolls in the rolling direction is made thicker to some extent (by doing so, the width Δβ of the thin parts on both sides increases and the shape becomes better. However, in the example where the inclination angle θ was 45 degrees, it was extremely difficult to make the entry end of the material to be rolled fit between the upper and lower rolls, and rolling could not be carried out. .

Piece (1111) of the irregular cross-section strip obtained in the above example
Table 1 shows the amount of widening Δβ and the degree of waviness of the thin parts on both sides expressed in steepness λ (%).

From these results, it can be seen that the oblique angle θ of the upper and lower rolls in the rolling direction corresponds to the width, thickness and material of the material to be rolled, and the shape of the target irregular cross-sectional strip. degree or more 4
It is only necessary to select an appropriate value within a range of less than 5 degrees, and with two pairs of upper and lower rolls with an appropriately set inclination angle θ in the rolling direction, both sides of the material to be rolled (j111 part) are rolled. ,
According to the rolling force ll and the device of the present invention, which thin the both sides to a predetermined thickness while widening them in the direction of both side edges, - bus rolling can be performed efficiently to form the desired shape having a convex part in the center of the cross section. It was confirmed that strips with irregular cross sections could be formed.

In this example, the lower roll was driven by a motor, but both the upper and lower rolls were not driven.
The upper and lower rolls can also be driven to rotate by the pulling force applied to the rolled material by the winder on the exit side.

11m FIG. 5a shows 4! of the rolling apparatus of this embodiment. Figures 5A and 5C are explanatory views of the main parts of Figure 5a. This embodiment has the same structure as the first embodiment described above, except that a grooved roll for finish rolling is additionally provided, and the differences will be briefly explained here.

In Fig. 5a, (1) and (1') are a pair of roll stands, 0 is an unwinding machine, 0 is a winding machine, 041.0
Reference numeral 9 indicates a deflection roll, and 0ω indicates a pair of guide rolls, which are the same as those of the first embodiment described above. 07) is a finishing roll stand, and this finishing roll stand 0 force is equipped with the configuration of a normal two-high rolling mill, and the pair of roll stands (11, (1°
) are arranged as a series of rolling mill rows. The roll stand 07) is provided with a pair of upper and lower roll θ marks as shown in FIG. 5, corresponding to the finished shape of the target irregular cross-sectional strip.

side, or a pair of upper and lower rolls as shown in Figure 5C (
20) and (21) are provided.

According to the rolling apparatus of this embodiment having the above configuration, the cross-sectional shape of the rolled material P formed by the pair of roll stands (1) and (1') in the previous stage is continuously adjusted, and its dimensions are It is possible to further improve the thinning, and it is also possible to correct warping, waving, etc. by applying equal rolling to each section of the cross section, or by applying more rolling to sections of the cross section that have less extension in the rolling direction.

〔Effect of the invention〕

As described above, according to the method and equipment for rolling a strip of irregular cross section according to the present invention, a strip of irregular cross section that is relatively thin and has a convex portion at the center of the cross section can be formed in − times of rolling. As a result, the number of processing steps and the number of roll stands required can be reduced, and production efficiency can be improved and equipment costs can be reduced.

[Brief explanation of the drawing]

FIG. 1a is a front sectional view showing the main parts of a rolling mill according to the first embodiment of the present invention, FIG. 1 is a sectional view taken along line A in FIG. A-A sectional view, Figure 2 is A in Figure 2a
-A sectional view, FIG. 3 is a schematic explanatory diagram of the rolling apparatus of the first embodiment of the present invention, FIGS. 4a to 4C are explanatory diagrams of the present invention, and FIG. 5S and 5C are explanatory diagrams of the main parts of FIG. 5A, FIGS. 6A and 6B are explanatory diagrams of the conventional rolling method, and FIGS. FIG. 7a and FIG. 7s are explanatory diagrams of the conventional rolling method. (1), (1°) - roll stand, (2) - upper roll, (3) - lower roll, (4) - chock, (5) - chock receiver. Figure 1a Figure 1 Patent Applicant Kobe Steel Co., Ltd. Representative Patent Attorney Akira Kanemaru Figures 2 and 3 Figure 5a Figure 4a Figure 4S Figure 4C Figure 6 a Figure 7a Figure 7b

Claims (3)

[Claims] (1) Provided symmetrically in the center at a predetermined interval,
Two pairs of upper and lower rolls, each with their axes tilted at a predetermined angle in the horizontal direction and with opposing central ends facing the rolling direction, are used to roll both sides of the strip-shaped material to be rolled in the width direction. 1. A method for rolling a strip of irregular cross-section, the method comprising applying rolling to a section of the material to be rolled, and reducing the thickness of both sides of the material to be rolled to a predetermined thickness while expanding the width in the direction of both side edges. (2) A method of rolling a strip of irregular cross-section, which comprises, in addition to the method of rolling a strip of irregular cross-section according to the first claim, further performing final finishing rolling using grooved rolls. (3) A pair of roll stands erected on the left and right, and upper and lower upper and lower roll stands, each of which is cantilevered so that its axis can be rotated in the horizontal direction, and is provided in pairs in the vertical direction. 1. A rolling device for rolling strips of irregular cross-section, comprising a rolling roll.