JP2745432B2 - Manufacturing method of strip with irregular cross section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention has a good shape having a stepped portion having a different thickness in the width direction by cold rolling, and has less variation in hardness distribution in the width direction. The present invention relates to a method for manufacturing a strip having a modified cross section.

[Prior Art] For example, as shown in FIG. 8, on one surface of a metal plate, a thin portion 1b in the width direction and a thick portion 1a are continuously formed via a step portion having a different thickness. A modified cross-section strip (hereinafter referred to as a modified cross-section strip at the end) 1 formed in a certain shape is widely used for applications such as a contact of a connector, a contact for a relay, and a terminal for lapping connection.

Conventionally, such a modified cross-section strip is formed by continuously cutting a predetermined portion in the width direction of the metal strip using a cutting tool or a mill while passing the metal strip having a rectangular cross section in the longitudinal direction. A mold having a convex portion or a concave portion having a width gradually increasing from a tip on a surface side facing a reciprocating flat roll as disclosed in Japanese Patent Publication No. 53-27234. A method in which a metal strip to be rolled is passed between a flat roll and a flat roll to be reciprocated, and the flat roll is pressed and intermittently rolled so as to form a stepped portion corresponding to the surface shape of the die. It was being done.

However, in the former cutting method, not only the work environment is deteriorated because cutting chips are continuously generated in order to cut the metal strip, but the loss of material is large and the yield is low,
Further, burrs, warpage, and the like are generated at the cut end, and there is a defect in quality. In the latter method of rolling intermittently, it is necessary to use a die, and the die is expensive, so that it is difficult to cope with variously shaped strips of various shapes. However, there is a disadvantage that the production efficiency is extremely low due to the difficulty in performing the production.

In addition to the above-mentioned method, one metal strip to be rolled is passed between work rolls having grooves formed in at least one of the trunks in the circumferential direction, and the strip is rolled into an irregular cross section. There is a way. However, in this method, since the metal strip to be rolled is rolled with the diameter of the opposing work rolls equal and the peripheral speed of the work rolls equal, the metal strip to be rolled has a large elongation in the rolling direction. Since there is a large difference in length between the rolled portion and the non-rolled portion, a waving phenomenon occurs in the rolled portion, and this phenomenon is remarkably exhibited when the rolling reduction is further increased.

[Problems to be solved by the invention]

The present invention solves the disadvantages of the prior art as described above, and provides an excellent deformed cross-section strip having an excellent yield without generating cutting chips, without generating burrs and waving phenomena, and with less variation in hardness distribution in the width direction. It is an object of the present invention to provide a method of manufacturing a strip having a modified cross section which can be produced well.

[Means for solving the problem]

The present inventors have conducted various studies in order to solve such a problem, and as a result, a rolling method of cold rolling by passing a metal strip between opposed work rolls in order to improve yield and increase production efficiency has been proposed. Good, furthermore, a large difference in length in the rolling direction of the metal strip between the rolled part and the unrolled part is caused by little deformation in the direction perpendicular to the rolling direction of the metal strip. Paying attention to the fact that two or more metal strips having the same degree of deformation resistance are overlapped between facing work rolls,
If cold rolling is performed at a rolling reduction of 30% or less in the passing between work rolls, the frictional force between the surface of the metal strip and the opposite side of the contact between the work rolls can be increased. Since the elongation in the direction is suppressed and deformation occurs in the width direction, no waving phenomenon occurs even in a thin plate, and the metal strips passed between the opposing work rolls are not clad. Japanese Patent Application No. 1-222 discloses a method of manufacturing a strip having a deformed cross section by peeling a rolled metal strip.
No. 7601 (hereinafter referred to as the prior invention).

However, the above-mentioned prior invention forcibly manufactures a deformed cross-section strip having a stepped portion having a different thickness in the width direction using a grooved work roll in which a groove is formed in a circumferential direction of a body portion. Therefore, the deformation behavior in the cross section of the metal strip to be rolled occurs in the groove direction of the grooved work roll and in the direction of the sheet pole, and irregularities are generated on the lower surface of the deformed cross-section strip, thereby forming the metal strip. There is a problem that the cross-sectional hardness distribution of the deformed cross-section strip varies.

The inventors of the present invention have further studied and, as a result of performing rough forming of a rolled metal strip into a deformed cross-section strip using the manufacturing method of the deformed cross-section strip of the prior application, the rough-formed deformed strip is then performed. One of the cross-section strips is subjected to finish forming in which cold rolling is performed by passing one of the cross-section strips between a grooved work roll having grooves formed in the circumferential direction of the body and a flat work roll. The present inventors have completed the present invention by investigating that a process for adjusting the cross-sectional shape and the cross-sectional hardness distribution can be included to manufacture a deformed cross-section strip which solves the problems of the prior invention.

Hereinafter, a method for manufacturing a strip having a modified cross section according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram of one embodiment of the method of the present invention, FIG. 2 is a schematic diagram of another embodiment of the method of the present invention, and FIG.
FIG. 4 is an enlarged end view of a main part of line BB in FIG. 1, FIG. 5 is an enlarged front view showing an example of a work roll in contact with a rolled metal strip, FIG. Fig. 6 (a) shows the cross-sectional shape of the deformed cross-section strip when the method of the present invention is carried out using the pure copper strip as the rolled metal strip, and FIG. FIG. 7 is an enlarged view only in the thickness direction, and FIG. 7 is a view showing a cross-sectional hardness distribution of a deformed cross-section strip according to the present invention using a pure copper strip as a rolled metal strip.

In order to carry out the method of the present invention, first, a rolling stand 4 for rough forming in which the work rolls 3 are arranged at opposing positions on both sides of the threaded metal plate 2 with the threading path therebetween is prepared.
The interval 3b between the opposing work rolls 3 provided on the rough forming rolling stand 4 is such that one or more rolled metal strips 2 passed between the work rolls 3 in a state where two or more sheets are overlapped.
It is set so that the rolling reduction between the work rolls 3 at the time of passing is 30% or less. And this pair of work rolls 3
It is necessary that at least one of them is a grooved work roll in which a groove 3a is formed in the circumferential direction of the body as shown in FIG. 5, and the other work roll 3 is in the circumferential direction of the body. A grooved work roll in which the groove 3a is formed, the groove 3a having the same width as the groove 3a with the position of the groove 3a facing the grooved work roll.
Use work roll 3 on which 3a is formed, or
As shown in the figure, it is preferable to use a flat roll in which a groove is not formed in the body.

First, two or more metal strips 2 to be rolled are passed between work rolls 3 of a rolling stand 4 for rough forming as described above, and the metal strips 2 are roughly formed into a strip having a deformed cross section. It is preferable that the rolled metal strips 2 to be overlapped are made of the same material, but any material may be used as long as they have substantially the same deformation resistance.

In this way, when two or more rolled metal strips 2 are stacked and roughly formed into a strip with a deformed cross section, if the final reduction ratio is 30% or less, one set of opposing work rolls 3 is formed.
It is sufficient to pass the rolled metal strip 2 once in the meantime, but if the final rolling reduction exceeds 30%, the number corresponding to the number of rolled metal strips 2 to be superimposed as shown in FIG. The unwinding and take-up reels 6 are provided on both sides of one rolling stand 4 for rough forming in the passing direction of the metal strip 2 to be rolled, respectively.
The rolling stand 4 in a state where the rolled metal strip 2 wound on each of the unwinding and take-up reels 6 provided on one side of the rough forming rolling stand 4 is overlapped via the opposing deflector rolls 5. Through the work rolls 3 and wound up on each of the unwinding and take-up reels 6 via the opposing deflector rolls 5 on the other side, and further reduce the distance 3b between the work rolls 3 of the rolling stand 4 for rough forming. Reverse rolling, in which the reciprocating passing operation of passing the rolled metal strip 2 in the direction opposite to the passing direction and then passing the rolled metal strip 2, or the number of rolled metal strips 2 to be overlapped as shown in FIG. The unwinding reel 6 ′ and the take-up reel 8 are provided on both sides of the rolled metal strip 2 in the passing direction of the rolled metal strip 2, and the interval 3 b between the work rolls 3 is set in the rolling direction of the rolled metal strip 2. The shape narrows as you go Unwinding reels 6 ′ which are respectively installed on the front and rear sides of the rough forming roll stand group 4 ′ in which a plurality of rough forming roll stands 4, on which the work rolls 3 are arranged, are arranged. And the take-up reel 8, and the deflector opposes the rolled metal strip 2 wound on the unwind reel 6 ′ on the side of the rolling stand 4 for rough forming with a large gap 3 b between the work rolls 3. The tandem rolling may be performed by passing the rolls in a unidirectional manner through a group of rolling stands 4 'for rough forming in a state of being superimposed via the rolls 5. Rolling with a rolling reduction of 30% or less.

In this way, the metal strip 2 to be rolled is passed through the gap 3b between the work rolls 3 of the rolling stand 4 for rough forming, rolled to a predetermined size, and roughly formed into a strip having a deformed cross section. 2
The rolled metal strips 2 in a state of being stacked one on another
In the case of reverse rolling as shown in FIG. 1, the film is peeled off at the position of the deflector roll 5 as shown in FIG. In the case of tandem rolling as shown in FIG. 2, it is transferred to the unwinding reel 7 of the rolling equipment provided with the rolling stand 9 for the next finish forming, and in the case of tandem rolling as shown in FIG. Rolling stand 9
Then, one of the roughly formed strips having a modified cross section is fed, subjected to finish rolling, and wound around a take-up reel 8, thereby producing the strip 1 having a deformed cross section. As shown in FIG. 4, the rolling stand 9 for finish forming comprises a pair of the grooved work roll 3 and the flat work roll 3 in which the groove 3a is formed in the circumferential direction of the body.

(Operation)

In order to manufacture the modified cross-section strip 1 having a step portion having a different thickness in the width direction by the method of the present invention, first, at least the grooved work roll 3 in which the groove portion 3a is formed in the circumferential direction of the body portion is formed. One or more work rolls are passed through a state in which two or more rolled metal strips 2 having substantially the same deformation resistance are stacked between the work rolls 3 of the rough forming rolling stand 4 installed on one side. The rolled metal strip 2 with two or more superimposed rolling strips between the three strips is 30% or less, which is a condition under which the metal strip is not clad, and rolled several times by reverse rolling or tandem rolling as necessary, and the deformed section strip The plate is roughly formed. The modified cross-section strip manufactured by the rough molding has a stepped section having a step in which a thickness is varied in a width direction by using a grooved work roll 3 in which a groove 3a is formed in a circumferential direction of a body. Since the method is a method for forcibly manufacturing a strip, the deformation behavior in the cross section of the rolled metal strip 2 is determined by the groove 3a of the grooved work roll 3.
Direction and the edge of the plate.
As shown in FIG. 1A, irregularities are usually generated, and the cross-sectional hardness distribution of the deformed cross-sectional strip is usually also varied. Then, in the method of the present invention, one of the roughly formed strips of irregular cross section is passed between the grooved work roll 3 and the flat work roll 3 in which the groove 3a is formed in the circumferential direction of the body. By performing rolling and finish forming, the uneven surface on the lower surface of the irregularly shaped strip strip roughly formed as shown in FIG. 6 (b) is adjusted to a flat surface by the flat work roll 3, whereby the cross section is formed. The hardness distribution is also adjusted so as to approach a constant value, and a strip having a good shape and a modified cross section is obtained.

〔Example〕

A work roll with a groove of 18 mm in width and 1 mm in depth formed at the center of the body of a work roll with an outer diameter of 70 mm and a body length of 120 mm. In the state where two pure copper strips with a thickness of 3 mm and a width of 30 mm are stacked on each other, the rolling reduction of the threading between one work roll is 17%.
Set the work roll peripheral speed to 4. without using rolling oil.
After producing a deformed cross-section strip by rough forming in which rolling is performed in two passes at 5 m / min, a grooved work roll similar to the grooved work roll and a flat work roll having an outer diameter of 70 mm and a body length of 120 mm are formed. The rolling speed of one of the roughly formed strips of irregular cross section is set to 2% between the work rolls of the rolling stands installed vertically and the peripheral speed of the work roll is 4.5 m / min without using rolling oil. As a result, the cross-sectional hardness distribution of the deformed cross-section strip approaches a constant value as compared with the rough forming, as shown in FIG. 7, and the deformed cross-section strip as shown in FIG. The shape of the lower surface became flat, and a strip with a good cross section of good quality could be manufactured.

〔The invention's effect〕

As described above, in the method of manufacturing the modified cross-section strip according to the present invention, the deformation resistance between the work rolls provided with at least one of the grooved work rolls in which the groove is formed in the circumferential direction of the body is reduced. 2 rolled metal strips of similar degree
Rolling of a deformed cross-section strip that is roughly formed by the method of manufacturing a deformed cross-section strip of the prior application of the present invention, in which a plurality of sheets are passed in a state of being stacked and rolling is performed at a rolling reduction of 30% or less in one pass between work rolls. The cross-sectional shape and cross-sectional hardness distribution are obtained by subjecting one of the sheets to finish forming by rolling the plate between a grooved work roll having grooves formed in the circumferential direction of the body and a flat work roll. This method has the following advantages and is of great industrial value.

By passing one of the roughly formed strips with irregular cross-sections between a grooved work roll and a flat work roll in which a groove is formed in the circumferential direction of the body, rolling is performed to finish-mold. The cross-sectional hardness distribution of the manufactured irregular-shaped cross-section strip can be made closer to a constant value from a state in which there is variation as in the case of rough forming.

By passing one of the roughly formed strips with irregular cross-sections between a grooved work roll and a flat work roll in which a groove is formed in the circumferential direction of the body, rolling is performed to finish-mold. The uneven surface on the lower surface of the manufactured modified cross-section strip can be a flat surface.

Irregularities and cross-sectional hardness of the lower surface of the irregularly shaped cross-section strip that occur during rough forming even when the grooves of the grooved work roll where the groove is formed in the circumferential direction of the body part during rough forming are not filled Variations in the distribution can be corrected by finishing forming using a flat work roll and a grooved work roll in which a groove having the dimensions of the final deformed cross-section strip is formed in the circumferential direction of the body. Occasionally, one type of work roll can form strips of different cross-sections of several dimensions.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of one embodiment of the method of the present invention, FIG. 2 is a schematic diagram of another embodiment of the method of the present invention, and FIG. 3 is AA of FIG.
FIG. 4 is an enlarged end view of a main part of the line BB in FIG. 1, FIG. 5 is an enlarged front view showing an example of a work roll in contact with a rolled metal strip, and FIG. FIG. 1 (a) shows a cross-sectional shape of a deformed cross-section strip obtained by performing the method of the present invention using a pure copper strip as a rolled metal strip, and FIG. FIG. 7 is a diagram showing only a cross-sectional hardness distribution of a deformed cross-section strip in which the present invention is implemented using a pure copper strip as a rolled metal strip,
FIG. 8 is a cross-sectional view of the modified cross-section strip. In the drawings: 1 ... irregular shaped strip 1a ... thick section 1b ... thin section 2 ... rolled metal strip 3 ... work roll 3a ... groove 3b ... gap between work rolls 4 ... rough forming Rolling stand 4 '... Rolling stand group for rough forming 5 ... Deflector roll 6 ... Winding and unwinding reel 6' ... Unwinding reel 7 ... Unwinding reel for finish forming 8 ... Finishing Take-up reel 9 for forming ... Rolling stand for finish forming

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiro Yamada 5 Ishizu Nishimachi, Sakai City, Osaka Prefecture Nisshin Steel Co., Ltd. Steel Research Laboratory (72) Inventor Ichiu Takagi 11-1 Showacho, Kure City, Hiroshima Prefecture Inside Steel Research Laboratories of Shin Steel Co., Ltd. (56) References JP-A-56-59503 (JP, A)

Claims (3)

(57) [Claims] 1. A grooved work roll (3) in which a groove (3a) is formed in a circumferential direction of a body portion when manufacturing a strip with a modified cross section having a step portion having a thickness varying in a width direction. Are rolled in a state where two or more rolled metal strips (2) having the same degree of deformation resistance are overlapped between work rolls (3) installed on at least one of the work rolls (3). ) Rolling at a rolling reduction of 30% or less during the passing of the strip, rough forming of the deformed cross-section strip, and then forming one of the roughly formed strips with a groove (3a) in the circumferential direction of the body. A method for manufacturing a strip having a modified cross-section, wherein the strip is passed between a grooved work roll (3) and a flat work roll (3) and rolled to finish-mold. 2. A rough forming process is carried out by reciprocating a metal strip (2) between a pair of work rolls (3) and reversing the direction of the metal strip (2). 2. The method for producing a strip having an irregular cross-section according to claim 1, wherein the interval (3b) between the work rolls (3) is reduced. 3. A plurality of sets of work rolls (3) in which the rough forming is performed in such a manner that the interval (3b) between the work rolls (3) is reduced in the direction of the passing of the rolled metal strip (2). The method according to claim 1, wherein the rolling metal strip (2) is passed in one direction.