JPH10166097A - Production of different cross-section bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a different cross-section bar which precisely produces the different shaped cross-section bar having a taper being gradually made thicker as going toward one side edge in the thickness of the width direction efficiently to the well workability for the secondary machining performance. SOLUTION: A metal bar S0 of rectangular cross-section is cold rolled passing through a rolling stand 5 arranged with rolling rolls 6, 6 to a different cross-section like metal bar S1 of an almost similar shape with a different cross-section bar to be produced, then the metal bar S1 is passed through the inside of a hole die 7 to reduce the thickness of the metal bar S1 within the range of 1 to 5%, and it is executed with cold drawing and a different cross section bar S2 is produced, lateral bent of the different cross section bar S2 is preferably straightened so that the side edges are made parallel and in straight lines with a lateral bent straightening stand providing side rolls 8 to press both side edges of the width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapered cross section having a tapered cross section whose thickness in the width direction gradually increases toward one side edge. The present invention relates to a method for manufacturing a profiled strip which can be manufactured efficiently.

[0002]

2. Description of the Related Art Conventionally, narrow cross-sectional strips having a tapered transverse cross-sectional shape such that the thickness gradually increases toward one side edge in the width direction are made of a raw material such as a metal rod or a metal strip. It has been manufactured by a method of passing the metal material through a hole die in which a through hole of a predetermined size and shape is formed and drawing the material, or a method of rolling by a rolling roll.

In the former method of drawing, a large resistance is caused when a metal material is passed through a hole die, so that abrasion of a through hole of the hole die and galling of the metal material are liable to occur. In order to manufacture a deformed cross-section by processing with a high sheet thickness reduction rate, it is necessary to reduce the amount of processing of the metal material, and to perform hot drawing while passing the metal material through the hole die while heating the metal material. After performing the work, it is necessary to perform the work of annealing the metal material and the work of cold drawing, and in order to further obtain the desired hardness and cross-sectional shape, the work of annealing and the work of cold drawing are alternately performed. It had to be repeated.

[0004] Therefore, not only the number of steps of alternately repeating the annealing operation and the cold drawing operation is increased, but also the passage of a metal material is prevented in order to prevent wear and galling of the through-hole of the hole die. Since the plate speed is limited, the production efficiency is very poor. Further, the metal strip obtained by hot drawing has the disadvantage that the surface roughness is low, the glossiness is low and the quality is inferior. Also, in the drawing process, in the cross section of the metal material, the center part is elongated first by relatively simple deformation mainly due to tensile stress and compression stress, while on the surface side it is deformed from the center part by deformation receiving shear stress. This causes a large variation in crystal grain size between the surface side and the central portion, resulting in an uneven metal structure and an uneven hardness.

When the metal structure has a non-uniform metal structure and a non-uniform hardness in the cross section of the metal material, for example, the metal material has a taper so that the thickness in the width direction gradually increases toward one side edge. When secondary processing such as bending a deformed cross-section strip manufactured into a shape into a ring shape with the center on the thin side is performed, the deformation resistance partially differs greatly and the roundness and cross section of the ring with high precision This is disadvantageous in that the shape cannot be obtained, the material is twisted, the flatness of the ring cannot be obtained, and stable secondary processing cannot be performed.

In the latter rolling method, since the deformation of the metal material is a plane strain and the deformation is uniform in the width direction, it is possible to obtain a uniform hardness and a metal structure and to perform the secondary processing. Since the rolling speed can be set to a relatively high speed, a profiled section having a taper is manufactured so that the thickness in the width direction gradually increases toward one side edge. It is also considered advantageous.

[0007] As a rolling method, for example, rolling is performed by passing a metal material between rolling rolls disposed so as to oppose the axis thereof in parallel with the width direction of the metal material.
No. 02, “Method of manufacturing titanium wire for electrode”, and the width of a metal material passing through a flat plate through a rolling roll whose axis is arranged in parallel with the direction of passing the metal material. Rolling in the width direction to roll the metal material in the width direction
Various methods have been conventionally proposed, for example, a method disclosed in Japanese Patent Application Laid-Open No. 123402/1992, "Method for Manufacturing Irregular Flat Strip".

In the former method of manufacturing a titanium wire for an electrode, a method for manufacturing a deformed cross-section strip is performed by passing a wire having a round cross-section through a hole die and arranging a round cross-section having a size corresponding to the cross-sectional area of the final product. After drawing into a wire having a shape, a method of rolling between hole-type rolls having large-diameter ends formed on both sides of a body portion contacting the front and back surfaces of the wire with a step to finish to a final product shape In addition, the latter “method of manufacturing a deformed flat rectangular strip” is that, after rolling a metal material to be processed in a longitudinal direction, the metal material is passed through a flat plate, and an axis of the metal material is passed through the metal material passing direction. When rolling in the width direction by a rolling roll that is arranged to be able to roll in the width direction of the metal material passing through the flat plate in parallel with the flat plate or the rolling direction of the metal material on the peripheral surface of the rolling roll. A parallel shaped rectangular groove is formed, and inside this shaped rectangular groove It is an extension method.

However, all of these rolling methods are methods in which a metal material is rolled into a desired deformed cross-section at a stroke. Since flattening of the roll, bending of the roll, and the like occur, it is difficult to manufacture a deformed cross-section strip with high accuracy.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned disadvantages of the prior art, and provides a tapered cross section having a taper whose thickness in the width direction gradually increases toward one side edge. It is an object of the present invention to provide a method of manufacturing a profiled strip that can be efficiently manufactured with high accuracy and excellent properties in secondary workability.

[0011]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above problems, and as a result, it is difficult to produce a deformed cross-section strip which requires high precision in rolling, but a large reduction in sheet thickness is required. It is possible to process into a state excellent in secondary workability, and it is difficult to process at a large thickness reduction rate by drawing using a hole die, but it is possible to manufacture products with high dimensional accuracy As a result of further study focusing on the fact that the deformation of the metal strip when the metal strip is passed through the hole die by cold drawing is 1 to 5% in the thickness reduction rate, It was clarified that it can be drawn into a state excellent in properties.

Therefore, a metal strip having a rectangular cross section is passed through a rolling stand provided with a rolling roll, and the metal strip is cold-formed into a deformed cross section substantially similar to the deformed cross section to be manufactured. After rolling, the metal strip is passed through a hole die that reduces the thickness of the metal strip within a range of 1 to 5%, and cold drawing is performed, whereby excellent productivity and good secondary workability are obtained. Therefore, the present invention has been completed by investigating that it is possible to manufacture a deformed cross-section strip having a small variation in the crystal grain size of the metal structure in a cross section required for the cross section and having a high dimensional accuracy.

[0013] As the rolling rolls for cold rolling into a deformed cross-sectional shape substantially similar to the deformed cross-sectional shape in which a metal strip having a rectangular cross section is to be manufactured, both rolls are in contact with the metal strip. Even if it is a grooved rolling roll in which a groove-shaped portion that decreases in diameter as it goes to one end is formed on the body,
Even if one of the rolling rolls is a flat rolling roll and the other rolling roll is a grooved rolling roll in which a groove portion whose diameter is reduced as it goes to one end is formed in a body portion in contact with the metal strip, both rolling rolls The above problem can be solved even with a tapered roll having a taper whose outer diameter gradually increases as the body part contacting the metal strip goes to one end in the axial direction, and further reducing the thickness of the metal strip. The deformed cross-section strip, which has been subjected to cold drawing by being passed through a hole die reduced in the range of 1 to 5%, is placed on its side by a horizontal bending straightening stand provided with side rolls for pressing both side edges in the width direction. It has also been found that it is more preferable to correct the lateral bending so that the edges are parallel and straight.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a profiled cross section according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of an irregularly shaped strip manufactured by the method of the present invention, and FIG. 2 is one of apparatuses suitable for performing the method of the present invention.
FIG. 3 is an explanatory view showing an example, FIG. 3 is an explanatory view showing another example of an apparatus suitable for carrying out the method of the present invention, and FIG. 4 is still another example of an apparatus suitable for carrying out the method of the present invention. FIG. 5 is an explanatory view showing a rolling roll as viewed from a line AA in FIG. 2, FIG. 6 is an explanatory view showing a rolling roll as viewed from a line BB in FIG. 2, and FIG. FIG. 8 is an explanatory view showing another example of the rolling roll corresponding to FIG. 6, FIG. 8 is an explanatory view showing a hole die viewed from a line CC in FIG. 2, FIG. 9 is a sectional view taken along a line DD in FIG. FIG. 10 is a view showing the surface roughness in the width direction of the irregularly shaped cross section manufactured by the method of the present invention.
1 is a view showing a metal structure at each position cut in the width direction of a deformed cross-section strip manufactured by the method of the present invention, and FIG. FIG. 1 is a diagram showing hardness distribution in comparison.
FIG. 3 is a diagram comparing the thickness distribution at the center in the width direction of the irregularly shaped cross-sections manufactured by the method of the present invention and the conventional method.

The method of manufacturing a modified cross strip according to the present invention, as shown in FIGS. 2-4 and FIGS. 6 and 7, first cross section as a raw material is unrolled a rectangular metal strip S ₀ from the coil 1, the deflector cold to the metal strip S ₁ having a modified cross strip S ₂ is substantially similar shape of deformed cross to be produced cross-section with Tsuban the rolling stands 5 which is disposed a rolling roll 6,6 through roll 2 To roll. The metal strip S ₀ is a raw material is cold rolled to the metal strip S ₁ having this cross section modified cross strip to be manufactured S ₂ substantially similar shaped deformed cross, usually to be produced the plate thickness because it uses those generally much thicker than the thickness of the modified cross strip S _2, the Figure 2 if only a rolling stand 5 to 1 group that is not installed, modified cross strip to be produced as shown in FIGS. 3 and 5 upstream of the rolling stand 5 to cold rolling metal strip S ₁ having S ₂ substantially similar shaped deformed cross, normal capable cold rolling at that rolling stand 5 to a predetermined thickness can be cold-rolled A rolling stand 3 provided with rolling rolls 4 and 4 composed of flat rolls is installed.

Examples of the metal strip S ₀ is the raw material, but can be used either annealed material and Hiyanobezai, when the modified cross strip S ₂ example to be produced requiring high hardness, cold The cross-section strip S ₂ to be used for producing a wide metal strip having a rectangular cross section in a state where work hardening has progressed considerably by cold rolling.
What is necessary is just to use what is slit in the longitudinal direction to the width corresponding to.

After the metal strip S ₀ as such a raw material is passed through a rolling stand 3 provided with rolling rolls 4, 4, where necessary, a rectangular metal strip having a desired thickness is disposed.
If upon cold rolling metal strip S ₁ having a modified cross strip S ₂ is substantially similar shape of irregular cross-sectional shape to be produced, which can not be cold-rolled to a predetermined shape in one pass rolling by the rolling stand 5 in 1 group In this case, the plate may be passed through a plurality of rolling stands 5 provided in tandem as shown in FIG.

[0018] The rolling stand 5 to cold rolling metal strip S ₁ having a modified cross-section shape of substantially similar shape and modified cross strip S ₂ should this production, the rolling roll 6,6 both as shown in FIG. 6 Even though the rolling stand is a grooved rolling roll in which a groove-shaped portion that is reduced in diameter as it goes to one end is formed in the body portion that is in contact with the metal strip, one of the rolling rolls 6 is a flat rolling roll (not shown). Even if the other rolling roll 6 is a rolling stand which is a grooved rolling roll in which a groove-shaped portion whose diameter is reduced toward one end is formed in a body portion which comes into contact with a metal strip, as shown in FIG. The rolling stand may be a tapered rolling roll having a tapered roll whose outer diameter gradually increases as the body part in contact with the metal strip approaches one end in the axial direction.

[0019] Although the metal strip S ₁ having the above-described such rolling stand 5 to Tsuban to modified cross-sectional shape of substantially similar shape and modified cross strip S ₂ cross section to be produced is to cold rolling, the cross the dimensions of the metal strip S ₁ in which the surface has a modified cross-section strip S ₂ is substantially similar shape of irregular cross-sectional shape to be produced, up to the processing unit from the inlet-side end is installed downstream of the rolling stand 5 metal strip S when the inner surface of the portion is a modified cross-sectional strip S ₂ to be produced is has been cold drawing Tsuban gradually the hole die 7 formed narrower shape as shown in FIG. 9 ₍₁₎ The amount of deformation must be a dimension capable of reducing the sheet thickness within a range of 1 to 5%, that is, a dimension capable of reducing the sheet thickness reduction rate to 1 to 5%.

The reason why the thickness reduction rate of each part in the width direction of the metal strip S1 passed through the hole die 7 is set to ₁ to 5% is that if the thickness reduction rate is less than 1%, the hole die 7 has a thickness smaller than 1%. the metal strip as well can not be performed with high stable cold drawing dimensional accuracy binding is small with respect to S _1, the metal strip S ₁ on the inner surface of the hole die 7 is large locally contact surface pressure This is because the inner surface of the hole die 7 is easily worn. The hole die 7 of the metal strip S ₁ when the sheet thickness reduction rate is more than 5%
Resistance increases for not only product value is reduced galling on the surface of the metal strip S ₁ is generated, the metal strip S ₁
If the sheet passing speed is low, the cold drawing cannot be performed, so that the productivity is deteriorated. Whether or not galling occurs on the surface of the metal strip S ₁ is determined by forming three metal strips S ₁ having a reduction rate of 1 to 7% in the same hole die 7.
As shown in Table 1 showing the results when the sheet was passed through the inside, it was confirmed that galling appeared when the sheet thickness reduction rate exceeded 6%.

[0021] ○: No galling ×: Galling occurred

Further, the irregularly shaped cross section S ₂ manufactured by being passed through the hole die 7 has a tapered cross sectional shape such that the thickness in the width direction gradually increases toward one side edge. , thin side compared to the thick side so prone to bend sideways not extend in the longitudinal direction, to press the both widthwise side edges of the metal strip S ₂ that Tsuban the bore die 7 as shown in FIGS. 2-4 It is preferable that the side bending is corrected by a side bending correction stand provided with the side rolls 8 so that the side edges are parallel and straight. The horizontal bending straightening stand provided with the side rolls 8 may be installed on a separate line from the production line for performing rolling and drawing as shown in FIG. 2, but as shown in FIG. 3 and FIG. Dice 7
It is preferable that a horizontal bending straightening stand is provided downstream of the machine to correct the horizontal bending in the same line as the production line for rolling and drawing.

[0023] Incidentally, in FIGS. 2-4, 9 deflector roll which is disposed downstream of the hole die 7, 10 modified cross strip S ₂ produced is Tsuban in hole die 7 is wound coil, 11 a bend transverse to its side edges by a lateral straightening stand provided with a side roll 8 that presses the width direction both side edges of the metal strip S ₂ that Tsuban the bore die 7 is aligned parallel is a correction coils of metal strip S _2.

[0024]

【Example】

As the metal strip S ₀ which is Embodiment 1 Raw materials, thickness 4 mm, the plate width 18.5mm
A hot rolled steel sheet having a rectangular cross section is prepared, and flat rolling rolls 4 and 4 having an outer diameter of 100 mm and a body length of 50 mm are arranged opposite to each other on the line shown in FIG.
And cold-rolled at 50% reduction to a thickness of 2 mm and width
18.5mm metal strip followed by 22.7 / 1000 tapered outer diameter of 98.74mm-99.16mm and 18.5mm body length. The grooved rolling rolls 6 and 6 are passed through a rolling stand 5 disposed oppositely, and the plate thickness is 1.48 mm at the thin side edge, 1.90 mm at the thick side edge, and the plate width is 18.5mm, that is, thin side edge ~
Sheet thickness reduction rate of the thick circumferential end edge is roughly formed into a metal strip S ₁ of the cross-sectional shape having a tapered and rolled by setting the inter-axes of the grooved rolling roll so that from 26 to 5%. At this time, the rolling speed of the grooved rolling rolls 6 and 6 was 20 m / min. The thus coarsely shaped metal strip S _1, the thickness of the thin side edges is 1.41 mm, the thickness of the thick circumferential end edge is at 1.83 mm, a plate width of 1
The sheet is passed through a hole die 7 having a through-hole having a processed part having a shape conforming to the product shape of 8.5 mm, and subjected to cold drawing to produce a tapered irregular-shaped section S ₂ .
It was wound around a coil 10. Sheet thickness reduction rate of the metal strip S ₁ that Tsuban this time the hole die 7 at 4.7% in thin side edges, was 3.7% in the thick circumferential edge. The lubricating material used for rolling and drawing was a mineral oil straight oil that has been generally used in rolling.
Since the modified cross strip S _2, which is drawn as described above lateral bending has occurred, the side roll 8 a modified cross strip S ₂ of wound into a coil to restrain the side edges as shown in FIG. 2 The sheet was passed through a provided horizontal bending straightening stand to correct the horizontal bending.

[0025] Thus the modified cross strip S ₂ produced, in Figure 10 the surface roughness in the width direction, in Figure 11 the metal structure at each position that has been cut in the width direction and the hardness distribution in the width direction Figure FIG. 12 shows the thickness distribution in the longitudinal direction, and FIG. Thickness distribution in FIG. 13 shows a plate thickness difference relative to the thickness of the widthwise center position of the modified cross strip S ₂ to be manufactured as a target.

Example 2 As a metal strip S ₀ as a raw material, a sheet thickness of 4 mm and a sheet width of 18.5 mm
A hot rolled steel sheet having a rectangular cross section was prepared and had an outer diameter of 9 with a 22.7 / 1000 taper in the line shown in FIG.
Three rolls with grooved rolls 6, 6 having ends of 100 mm outside diameter formed on both sides of a body of 8.74 mm to 99.16 mm and having a body length of 18.5 mm are provided opposite each other. The thickness of the thin side edge is 1.48 mm, the thickness of the thick side edge is 1.90 mm, and the width of the plate is 18.5 mm. the thickness reduction rate was roughly shaped metal strip S ₁ of the cross-sectional shape having a tapered on both surfaces are rolled by setting the inter-axes of the grooved rolling roll so that from 63 to 52.5%. The rolling speed at this time was 20 m / min. The thus coarsely shaped metal strip S _1, the thickness of the thin side edges is 1.41 mm, the thickness of the thick circumferential end edge is at 1.83 mm, the shape of the plate width matches the product shape of 18.5mm widthwise side edges of the through-hole having a machining portion is Tsuban in hole die 7 is bored to produce a modified cross strip S ₂ having a tapered performing cold drawing process, the metal strip S ₂ The horizontal bend was corrected by a horizontal bend straightening stand provided with a side roll 8 for pressing so that the side edges were parallel and straight, and wound around the coil 11. At this time, the sheet thickness reduction rate of the metal strip S ₁ passed through the hole die 7 is the thinner side edge.
It was 4.7% and 3.7% at the thicker side edge. The lubricating material used for rolling and drawing was a mineral oil straight oil that has been generally used in rolling. The surface roughness in the width direction, the metal structure at each position cut in the width direction, the hardness distribution in the width direction, and the properties of the plate thickness distribution in the longitudinal direction of the irregularly shaped strip S ₂ thus manufactured are respectively The results obtained were substantially the same as those of the profile of the irregularly shaped cross section manufactured in Example 1.

Comparative Example 1 As a raw material, a cross section having a radius of 4 mm was circular and the temperature was 700 ° C.
Prepared hot rolled wire of ordinary steel with a thickness of 1.56m at the thin side edge
m, hot-drawing by passing through a hole die with a through-hole with a processed part with a thickness of 2.03 mm and a width of 20 mm at the thick side edge at a passing speed of 10 m / min After processing to produce a tapered section with taper, and after winding up the coil,
After annealing, a hole with a processed part with a thickness of 1.48 mm on the thin side edge, 1.90 mm on the thick side edge, and a width of 18.5 mm The threading speed in the die is 10
After passing the sheet at m / min, cold-drawing was performed to produce a tapered profiled strip, and after winding on a coil, annealing was again performed, and the thickness of the thin side edge was 1.41 mm. The thickness of the thick side edge is 1.83mm and the width of the board is 18.5mm. The sheet was subjected to cold drawing to produce an irregularly shaped section having tapered surfaces on both sides, and wound around a coil. These cold drawing processes were performed by applying a generally used phosphoric acid film treatment.

FIG. 14 shows the surface roughness in the width direction, FIG. 15 shows the metal structure at each cut position in the width direction, and FIG. 12 shows the hardness distribution in the width direction. Shown respectively.

Comparative Example 2 As a metal strip as a raw material, a hot rolled ordinary steel sheet having a thickness of 4 mm and a width of 18.5 mm and a rectangular cross section was prepared, and the outer diameter of which was 22.7 / 1000 tapered was 98.74. mm ~ 99.16mm and body length 18.5mm
Rolled rolls with grooves having an outer diameter of 100 mm are formed on both sides of the body with a step at the ends. mm, 2.40 mm at the thick side edge, and 18.5 mm board width, ie, the thin side edge ~
Rolling is performed by setting the center of the grooved roll so that the thickness reduction rate of the thick side edge becomes 50.5 to 40%, and roughly formed into a metal strip having a tapered cross-sectional shape. Article 2
98 / 74mm to 99.16mm with 2.7 / 1000 tapered outer diameter
With a body length of 18.55 mm and an outside diameter of 100 mm via a step on both sides
The rolled grooved roll that forms the end of the plate is passed through a rolling stand that is arranged opposite, the plate thickness becomes 1.41 mm at the thin side edge and 1.83 mm at the thick side edge That is, by setting the distance between the axes of the grooved rolling rolls so that the reduction rate of the thickness of the thin side edge to the thick side edge becomes 28.8 to 23.8%, the metal strip having a tapered cross section is formed. It was roughly formed. At this time, the rolling speed with the grooved roll was 20 m / min.

FIG. 13 shows the thickness distribution in the longitudinal direction of the thus-formed modified cross-section strip. The sheet thickness distribution in FIG. 13 is indicated by a sheet thickness difference with respect to the target sheet thickness at the center position in the width direction of the deformed section to be manufactured.

The properties of the modified cross section S ₂ produced by carrying out the method of the present invention as in Examples 1 and 2 and the modified cross section produced by the conventional method as in Comparative Examples 1 and 2 are described below. Compare. Modified cross section strip S manufactured by the method of the present invention
₂ has a maximum surface roughness of about 1 as shown in FIG.
In contrast to having a glossy surface property of μm, the irregularly shaped cross section manufactured by the conventional method as in Comparative Example 1 has a maximum surface roughness of about 15 μm as shown in FIG. The surface properties were poor, and the phosphoric acid film remained during cold drawing.

The deformed cross section S ₂ manufactured by the method of the present invention has a substantially uniform metal structure at each cut position in the width direction as shown in FIG. 11, while the conventional method as in Comparative Example 1 The irregularly shaped cross section manufactured by the above method had a structure in which there was a large difference in the crystal grain size between the surface layer portion and the central portion of the plate thickness as shown in FIG. This is because there is a large difference in shape and dimensions between the metal material and the manufactured irregular cross section,
In the conventional method, a high thickness reduction rate is required for processing from a metal material to a deformed cross-section strip, so the cold drawing and annealing steps are repeated, and as a result, the surface layer with large processing strain is preferentially recrystallized. It is presumed that a large difference occurs in the crystal grain size from the central part.

The profiled strip S produced by the method of the present invention
₂ , as shown in FIG. 12, the hardness distribution in the width direction is higher gradually on the thinner side where the sheet thickness reduction rate is higher and gradually decreases toward the thicker side, but the hardness difference is very small, As shown in FIG. 12, the irregularly shaped strip produced by the conventional method as in Comparative Example 1 has a non-uniform and complicated hardness distribution in the width direction, and the difference in hardness is very large.
This indicates that in conjunction with the state of the metal structure, modified cross strip S ₂ prepared by the method of the present invention is excellent in secondary processability.

Further, as shown in FIG. 13, the irregularly shaped strip S ₂ produced by the method of the present invention has a small thickness variation in the longitudinal direction at the central position in the width direction, and ± 5 μm within a length of 10 m.
And the dimensional accuracy is extremely excellent, whereas the irregularly shaped cross section manufactured by the conventional method as in Comparative Example 2 has a large variation in the plate thickness in the longitudinal direction at the center in the width direction as shown in FIG. Dimensional accuracy is poor with ± 30μm within 10m length.

[0035]

As described above in detail, according to the method of manufacturing a deformed cross-section strip according to the present invention, the drawing is performed at a high rate of reduction in thickness, which is limited by the working speed and requires hot working and annealing. Can be processed at a high rate of thickness reduction from the metal strip of the material to the irregular cross-section strip, and has a uniform hardness distribution,
Moreover, it is possible to efficiently produce an irregularly shaped strip with extremely high accuracy. In addition, surface roughness is small and excellent in surface properties,
Since the metal structure at each cut position in the width direction is substantially uniform and the difference in hardness distribution is small in the width direction, the secondary workability is excellent, and it is possible to manufacture a deformed cross-section strip having excellent quality. it can. Furthermore, since both rolling and drawing are cold working, they can be continuously performed on one production line, and are excellent in production efficiency and can be easily performed. The value of the method of the present invention having various effects as described above, which contributes to the steel field, is extremely large.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an irregularly shaped strip manufactured by the method of the present invention.

FIG. 2 is an explanatory view showing an example of an apparatus suitable for carrying out the method of the present invention.

FIG. 3 shows another device suitable for carrying out the method of the present invention.
It is explanatory drawing which shows an example.

FIG. 4 is an explanatory view showing still another example of an apparatus suitable for carrying out the method of the present invention.

FIG. 5 is an explanatory diagram showing a rolling roll as viewed from a line AA in FIG. 2;

FIG. 6 is an explanatory view showing a rolling roll as viewed from a line BB in FIG. 2;

FIG. 7 is an explanatory view showing another example of the rolling roll corresponding to FIG.

FIG. 8 is an explanatory diagram showing a hole die viewed from a line CC in FIG. 2;

9 is a sectional view taken along line DD in FIG.

FIG. 10 is a view showing the surface roughness in the width direction of the irregularly shaped cross section manufactured by the method of the present invention.

FIG. 11 is a view showing a metal structure at each position cut in the width direction of the irregularly shaped cross section manufactured by the method of the present invention.

FIG. 12 is a diagram showing, in comparison, hardness distributions in the width direction of irregularly shaped cross-sections manufactured by the method of the present invention and the conventional method, respectively.

FIG. 13 is a diagram showing, in comparison, sheet thickness distributions at central positions in the width direction of irregularly shaped cross-sections manufactured by the method of the present invention and the conventional method.

FIG. 14 is a diagram showing the surface roughness in the width direction of a profiled strip manufactured by a conventional method.

FIG. 15 is a view showing a metal structure at each position cut in the width direction of a deformed cross-section strip manufactured by a conventional method.

[Description of Signs] 1 Coil 2 Deflector Roll 3 Rolling Stand 4 Rolling Roll 5 Rolling Stand 6 Rolling Roll 7 Hole Die 8 Side Roll 9 Deflector Roll 10 Coil 11 Coil S ₀ A metal strip having a rectangular cross section as a raw material S ₁ A metal strip having a deformed cross section substantially similar to the deformed cross section to be manufactured S ₂

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B21H 8/02 B21H 8/02

Claims (5)

[Claims] 1. A metal strip having a rectangular cross section is passed through a rolling stand provided with a rolling roll, and the metal strip is cold-formed into a deformed cross section substantially similar to the cross section to be manufactured. A method of manufacturing a deformed cross-section strip, comprising: rolling the metal strip in a hole die for reducing the thickness of the metal strip within a range of 1 to 5% to perform cold drawing. 2. Both rolling rolls disposed on a rolling stand for cold-rolling to a deformed cross section substantially similar to the deformed cross section to be manufactured in cross section, one end of which is provided at the body contacting the metal strip. The method for producing a profiled strip according to claim 1, wherein a grooved roll having a groove-shaped portion whose diameter decreases as the step goes is used. 3. Rolling rolls disposed on a rolling stand for cold rolling into a cross-sectional shape substantially similar to the deformed cross-section to be manufactured in cross section, one of the rolling rolls is a flat rolling roll and the other is a flat rolling roll. The method for producing a profiled strip according to claim 1, wherein a grooved roll having a groove-shaped portion whose diameter is reduced as it goes to one end is formed on a body portion of the roll contacting the metal strip. 4. Both rolling rolls disposed on a rolling stand for cold rolling into a deformed cross-sectional shape substantially similar to the deformed cross-sectional shape whose cross section is to be manufactured have a body in contact with the metal strip as a shaft. The method according to claim 1, wherein a tapered roll having a taper whose outer diameter gradually increases toward one end in the direction is used. 5. A side that presses both side edges in the width direction of a deformed cross-section strip that has been subjected to cold drawing by passing through a hole die that reduces the thickness of the metal strip within a range of 1 to 5%. The method according to any one of claims 1 to 4, wherein the lateral bending is corrected by a horizontal bending correction stand provided with a roll so that the side edges thereof are parallel and straight.