JPH0677764B2 - Manufacturing method of modified cross-section strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Background and Object of the Invention] The present invention relates to a method for producing a strip material having a portion where the plate thickness in the width direction is changed continuously in the longitudinal direction, that is, a so-called irregular cross-section strip by a rolling method. Regarding improvement.

The present inventors have previously proposed the following method for rolling a modified cross-section strip. That is, at least one is rolled by applying a rolling force only to the portion where the plate thickness in the width direction of the material is reduced by a work roll that is a grooved roll,
The step of buckling and deforming the part of the material located in the groove part of the grooved roll into the groove, the step of flatly rolling the buckled and deformed part of the deformed material, and the step of flatly rolling It is a method including a step of rolling a material at substantially the same reduction ratio according to the width-direction plate thickness ratio.

According to such a method, the material can be continuously run in the longitudinal direction, and the occurrence of meandering or twisting of the strip can be prevented, so that the number of working steps can be reduced and the productivity can be improved. is there.

However, in the case of this method, the material after the buckled portion is rolled flat has a tendency that the plate thickness in the vicinity of the thick-walled molded portion of the thin-walled molded portion tends to become thicker, and thereafter, depending on the widthwise plate thickness. Even if rolled at substantially the same reduction rate, the plate thickness dimension accuracy in the width direction is not improved, and there is a drawback that the process of rolling at substantially the same reduction rate becomes unstable.

Therefore, an object of the present invention is to provide a manufacturing method by an improved rolling method capable of improving the plate thickness dimension accuracy in the width direction and making the process more stable.

[Summary of the Invention] According to the present invention, the object is to increase the thickness of the material between the step of flattening the buckled portion and the step of rolling at the same reduction ratio according to the widthwise plate thickness. This can be achieved by adding a step of rolling the thin-walled molded portion including the step portion between the molded-walled portion and the thin-walled molded portion at a low pressure reduction rate to reduce the variation in the plate thickness in the width direction of the thin-walled molded portion.

In the case of the present invention, the number of passes in each step is appropriately selected according to the plate thickness and width of the material, the desired width-direction plate thickness ratio, and the like.

Further, in the case of the present invention, an intermediate treatment such as annealing may be added between each step for adjusting hardness, uniform working degree and the like.

Materials applicable to the method of the present invention include materials made of copper, copper alloys, aluminum, aluminum alloys, iron, steel and the like, and composite materials made of combinations thereof.

[Embodiment] The present invention will be described below with reference to the drawings. As shown in FIG. 1, a flat plate-shaped material 1 having a predetermined width and thickness has at least four sets of rolls 2, 3, 4 and It is processed by passing through 5 in order, and it is shape | molded by the irregular cross-section strip 16.

As shown in FIG. 2, the first set of rolls 2 is constituted by a grooved roll 21 having at least one groove portion 22.
Then, the raw material 1 passes through between the grooved roll 21 and the flat roll 24 with the groove 22 as the center, so that both side edges of the material 1 and the surface 23 defining the groove 22 of the grooved roll 21 and the flat roll 24. Is pressed between and. At this time, most of the material flow caused by the deformation of the thin-walled molded portion 11 moves to and is absorbed by the unpressurized portion 12, and the thick-walled molded portion is cut into the groove 22.
Buckle and deform inward. Therefore, even if there is a thickness difference in the width direction, there is almost no difference in the elongation in the longitudinal direction or the rolling direction, and the material
After 13 rolled, it deformed into a seaweed and wavy,
There is no twist. The groove portion 22 of the grooved roll 21 does not necessarily have to have a semicircular cross section, as long as there is a space in the groove portion 22 where the material can be deformed and buckled, its cross sectional shape is rectangular,
It may be trapezoidal or the like.

The second set of rolls 3 for rolling the material 13 comprises a pair of flat rolls. Therefore, as the raw material 13 passes through the roll 3, the thick-walled molded portion 12 is flatly rolled, and as shown in FIG.

The material 14 is subsequently passed through a third set of rolls 4, at least one of which has a groove 42 as shown in FIG.
And a grooved roll 41 having a groove. The groove portion 42 of the grooved roll 41 has a width approximately equal to the thick-walled molded portion of the product 16, and a depth larger than the difference in thickness between the thick-walled molded portion and the thin-wall molded portion of the material 14, The surface defining 42
The boundary edge with 43 has a shape substantially equal to the stepped portion between the thick-walled molded portion and the thin-walled molded portion of the product 16, for example, a right angle. Therefore, the material between the grooved roll 41 and the flat roll 44 is
14 is set to a value equal to or slightly smaller than the thickness of the thin-walled molded portion 11 and the raw material 14 is passed therethrough, whereby the thin-walled molded portion 11 including the stepped portion of the raw material 14 is rolled at a low pressure reduction rate and striped in the width direction. A material 15 having a thin-walled molded portion with high thickness dimension accuracy can be obtained.

This blank 15 is then passed through a fourth set of rolls 5 in order to finish the shape with varying thickness into a predetermined size. As shown in FIG. 5, the roll 5 is composed of a grooved roll 51 having a stepped groove portion 52 having a cross section of which one side is equal to the product cross section.
It can be rolled at the same rolling ratio corresponding to a wall thickness ratio of 15. Therefore, the raw material 15 is uniformly stretched in the longitudinal direction or the rolling direction by passing through the roll 5, and is finished into a predetermined cross-sectional size to become a product 16.

Incidentally, a thickness 2.0 mm, a copper plate having a width of 46 mm, using a grooved roll 21 and a flat roll 24 having a groove portion 22 having a semicircular cross section with a diameter of 25 mm, is rolled around the groove portion 22 to form the thin-walled forming portion 11. Although the thickness was 0.6 mm (70% reduction), the thin-walled molded portion 11 of the material 13 was flat without waving, and then the thick-walled molded portion 12 was rolled until its upper and lower surfaces were parallel, Further, the thin-walled molding portion including the stepped portion inclined between the grooved roll 41 and the flat roll 43 was rolled at a low pressure reduction rate to improve the plate thickness dimensional accuracy in the width direction of the thin-walled molding portion.

The material 15 was then rolled using the grooved rolls 51 to finish the modified cross-section strip 16 with the thickness of the thick-walled molding portion of 1.2 mm and the thickness of the thin-walled molding portion of 0.42 mm. Of course, no twist was seen in the entire strip.

As another example, the material 15 that has passed through the third set of rolls 4 in the above-described example is annealed at 450 ° C. for 30 minutes and then rolled using the grooved rolls 51, so that the thick-walled portion has a thickness of 1.0. mm, and the thin-walled molded part has a thickness of 0.4 mm.
As in the previous example, the plate thickness dimension accuracy in the width direction was good, and neither waviness of the thin-walled molded portion nor twist of the whole was observed.

Incidentally, in the previous example, the case of the modified cross-section strip in which the thick-walled molding portion projecting to the one surface side is arranged in the center is shown, but it is possible to mold it into a form in which both surfaces are projecting by using a pair of grooved rolls. Good. Needless to say, the number and positions of the groove portions of the grooved roll may be changed to form desired sectional shapes having different numbers and positions of thick-walled forming portions.

In the step of rolling the deformed portion to be flat, the thickness of the thick-walled molded portion may be slightly reduced by this rolling, or the upper and lower surfaces may not be completely flat.

[Effects of the Invention] As is clear from the above description, the present invention improves the plate thickness dimensional accuracy of the thin-walled molded portion by rolling the local portion of the material so as not to perform the reduction to the thick-walled molded portion. Since it is a method of rolling at the same reduction rate according to the widthwise plate thickness, the process of rolling at the same reduction rate is stabilized, and the modified cross-section strip with good dimensional accuracy is as efficient as ordinary groove roll rolling. There are advantages that can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the forming step of the method according to the present invention, and FIGS. 2 to 5 are explanatory views showing the state of each rolling in the example of FIG. 1,13,14 and 15: Material, 16: Product (profile section strip), 2, 3, 4 and 5: Roll, 21, 41 and 51: Grooved roll, 22, 42 and 52: Groove part, 11: Thin wall Molded part, 12: Thick molded part.

Claims (2)

[Claims] 1. A work roll, at least one of which is a grooved roll, rolls by applying a rolling force only to a portion where the plate thickness in the width direction of the material is to be thinned, and is positioned in the groove portion of the grooved roll of the material. A step of buckling and deforming the part to be deformed into the groove part, a step of flatly rolling the buckled part of the deformed material, and a thick-walled part of the material in which the buckled part is flatly rolled. Characterized by including a step of rolling a thin-walled molded portion including a stepped portion of the thin-walled molded portion at a low pressure reduction rate, and a step of rolling a material rolled at a low pressure reduction rate at the same reduction rate according to the width direction plate thickness. And a method of manufacturing a modified cross-section strip. 2. The method for producing a modified cross-section strip according to claim 1, wherein the material is annealed before being rolled at the same reduction rate.