JPH06246302A - Manufacture of plate bent angle material channel material - Google Patents

Abstract

PURPOSE:To highly productively manufacture an angle material and a channel material having a prescribed radius at an outer angle part, an outer corner part to be used for a skeleton of a steel frame building. CONSTITUTION:This manufacture method consists of a 1st stage to cause work hardening at the previously unbent parts 61, 62 and a 2nd stage to form a part which does not receive the work hardening through plate bending into the angle material and channel material. Further, this manufacture contains a 3rd stage wherein only each end face 67, 68 of both its sides 65, 66 or both its flange parts are cold-finished by a mill having four rolls 10, 11, 12, 13 which are parallel with each other vertically and laterally and are pushed in by the collar part 102 of the horizontal roll 10 and by the collar parts 101, 102 of a vertical right roll 13 or a horizontal upper roll. This is the manufacture method for the angle material or the channel material having a prescribed radius at the apex angle part 73 or the outer corner angle part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle material having an apex angle of 90 ° and a predetermined R inside and outside of its tip, and a channel material (groove type material) having both predetermined inner and outer corners. The present invention relates to a manufacturing method of.

[0002]

[Prior art]

(Angle material) Conventionally, as a method of manufacturing an angle material,
Two main methods are known. In the first method, as shown in FIG.
This is a forming method in which the angle member 2 is manufactured by bending at 0 and 21. The second method is a method in which a billet is hot worked into a predetermined shape by a rolling roll to produce an angle material. In recent years, for example, stainless steel angle materials have been required to be inexpensive and have excellent decorative properties as the demand for them as building materials and other decorative materials for buildings has increased. (Channel material) Conventionally, mainly two methods are known as methods for manufacturing a channel material. As shown in FIG. 4, the first method is a forming method in which the channel material 4 is manufactured by bending both ends with rolls 30 and 31, leaving a substantially central part of a long thin metal flat plate. The second method is a method of manufacturing a channel material by hot working the billet into a predetermined shape with a rolling roll. In recent years, for example, a stainless steel channel material has been required to be inexpensive and excellent in decorativeness as the demand for it as a building material and a decorative material for buildings has increased.

[0003]

[Problems to be Solved by the Invention]

(Angle material) However, the above-mentioned conventional method for manufacturing an angle material has the following problems. That is, the former forming method is a method of directly forming a flat metal plate on the angle member 2 by the rolling rolls 20 and 21, as shown in FIG. The rolling roll is composed of a roll 20 having a right angle V-shaped groove and a roll 21 having a convex portion having a right apex angle, and a metal flat plate is rolled between the both rolls 20 and 21 at a right angle. However, according to this method, as shown in FIG. 3, only the angle member 2 in which the inner and outer apex angle portions 201 and 202 do not have the predetermined R is obtained. Moreover, as shown in FIG. 3, the angle member 2 produced by the forming method has the inner / outer apex angle portion 20.
Since No. 1 and No. 202 do not have a predetermined R, the decorativeness is impaired when used in the corners of a building such as a right-angled corner or a pillar. Further, in the latter hot rolling method, the surface pressure applied to the roll hole die is higher than that in plate rolling, and the difference between the material and the roll surface speed greatly differs depending on the location, which causes the surface of the angle material to become rough. , The decorativeness is impaired. The present invention has been made in view of the above conventional problems, and is a method for producing an angle member having inner and outer apex angles of a predetermined R with high productivity, good skin, and high accuracy. Is to provide. (Channel material) However, each of the above-mentioned two conventional methods for manufacturing a channel material has the following problems.
That is, the former forming method is as shown in FIG.
This is a method in which a metal flat plate is directly formed into the channel material 4 by the rolling rolls 30 and 31. The above-mentioned rolling roll is a roll 30 having a square U-shaped groove with a right angle.
And a roll 31 having a right angle and a convex portion with a radius R. A metal flat plate is rolled between the rolls 30 and 31 into a square U shape with a right angle. However, in this method, as shown in FIG. 4, the inner / outer corner portions 441, 451,
Only the channel material 4 in which 442 and 452 did not have the intended R (roundness) was obtained. Moreover,
As shown in FIG. 4, the channel material 4 produced by the forming method has inner and outer corner portions 441, 451 and 4 respectively.
42 and 452 do not have a predetermined R, respectively, and when used in corners such as right-angled corners of buildings and corners of buildings, decorativeness is impaired. The latter hot rolling method is
The surface pressure applied to the roll hole type is higher than that in sheet rolling, and the difference between the material and the roll surface speed greatly differs depending on the location, which roughens the surface of the channel material and impairs decorativeness. The present invention has been made in view of the above conventional problems, and a method for manufacturing a channel material having inner and outer corner portions having a predetermined R with high productivity, good skin, and high accuracy. It is the one we are trying to provide.

[0004]

The gist of the present invention is as follows. That is, (a method for manufacturing a plate-bending angle material) In a method for manufacturing a plate by bending a plate, in the plate-shaped metal material, a desired portion in the middle of the plate width direction is left thick in a strip shape, and both side portions are formed in a strip shape. A first step of performing cold working to reduce the thickness and to cause work hardening, and a band-shaped portion in the middle of the plate width direction of the first intermediate member that has been work hardened in the first step and has no work hardening. Second step of cold bending into a substantially L-shape so that the central portion of the plate is the apex angle of the angle member, and the inner top of the substantially L-shaped second intermediate member obtained in the plate bending step A horizontal upper roll for rolling the corner portion to a predetermined R, a vertical left roll contacting the left outer surface of the intermediate member, a horizontal lower roll contacting the outer and lower surfaces of the intermediate member, and a vertical contacting the right lower end surface of the intermediate member. Using the right roll, roll the inner and outer apex angles to the specified radius and at the same time , A third step of pressing each of the upper end face and the lower end face to perform cold rolling for covering the lack of meat at the apex angle. (Manufacturing Method of Plate Bending Channel Material) In a method of manufacturing a channel material by bending a plate, a desired portion in the middle of the plate width direction in the plate-shaped metal material is left thick in a strip shape, and the center part and both side parts in the plate width direction are left. And reduce the thickness of each strip,
And a first step of performing cold working that causes work hardening,
An intermediate portion of the band-shaped portion of the first intermediate member which has been work-hardened in the first step and which has not been work-hardened in the middle in the plate width direction;
In the final step, both side parts are made into both flange parts of the channel material and each part to be the web part, and are cold-folded into a substantially U-shape so that each boundary part has each corner angle. 2 steps, a horizontal upper roll for rolling each inner corner portion of both flange portions and the web portion of the substantially U-shaped second intermediate member obtained in the plate bending step to a predetermined R, and an intermediate member Using a vertical left roll in contact with the outer surface of the left flange part of the, a horizontal lower roll in contact with the outer and lower surfaces of the web part of the intermediate member, and a vertical right roll in contact with the right outer surface of the right flange part of the intermediate member, At the same time as rolling the corner portion to a predetermined R, the third step of pressing the upper end faces by the stepped horizontal upper rolls and performing cold rolling to cover the lack of meat at each outer corner angle. It is characterized by that. The portion where the horizontal upper roll contacts the inner surface of the second intermediate member is smoothly processed in a low friction state, or the horizontal upper roll and the outer surface of each flange portion of the intermediate member are A low friction state is achieved by supplying a lubricant between them.

[0005]

[Action and effect]

(Manufacturing Method of Plate Bending Angle Material) (First Step) In a method of manufacturing a angle material by bending a plate, first, a desired portion in the plate width direction middle of the plate-shaped metal material is a cylindrical roll. , The other is a two-roll rolling machine with axes parallel to each other, with a flat bottom in the center, leaving a thick strip, and thinning each strip for both sides, and work hardening Is subjected to cold working. By this cold rolling, a desired portion in the middle of the plate width direction remains thick in a strip shape, both side portions are thinly rolled in each strip shape, and the portion is work-hardened. The first intermediate member obtained by this cold rolling has a shallow depth of the hole die,
Therefore, since the rolling is performed by a two-roll mill having a small peripheral speed difference and is cold, seizure or the like does not occur. Therefore,
The surface of the first intermediate member is beautiful. (Second step) The first intermediate member, which is work-hardened in the first step, is a convex roll having a right-angled top.
The other is a right-angled V-shaped roll, which is a two-roll rolling machine with axes parallel to each other, so that the central portion of the band-shaped portion in the middle of the plate width direction where work hardening does not occur is the apex angle of the angle member. , Bend cold to form an approximately L shape. By this cold rolling, the central portion of the strip-shaped portion in the middle of the plate width direction in which no work hardening has occurred is bent, so that bending can be done smoothly and reasonably. Therefore, in the bent second intermediate member, no flaws such as cracks are generated in the bent apex portion. (Third step) In order to roll the inner apex angle portion of the four-roll rolling machine parallel to each other vertically and horizontally with respect to the substantially L-shaped second intermediate member obtained in the plate bending step to a predetermined R Using a horizontal upper roll, a vertical left roll contacting the left outer surface of the intermediate member, a horizontal lower roll contacting the outer lower surface of the intermediate member, and a vertical right roll contacting the right lower end surface of the intermediate member. At the same time as rolling the corner portion to each predetermined R, pressing the upper end face and the lower end face respectively with the flange portion of the horizontal upper roll and the vertical right roll, a rolling process for covering the lack of meat at the apex angle is performed. Give. Since the product obtained in this step has the work-hardened region applied in the first step, the apex angle portions on both the inner and outer sides are prevented from widening, and the movement of the meat toward each end is also suppressed. It Therefore, an angle member having a predetermined radius R formed at the outer apex portion can be obtained. (Effect) In the angle member 2 produced by the conventional forming method, the inner and outer apex angle portions 201 and 202 do not have predetermined R, and the right angle corner portion of the building,
When used for corners such as pillars, it had a drawback that the decorativeness is impaired, but if finishing is performed by the cold rolling method of the present invention, surface reduction is applied to both end surfaces,
Excessive thickness is formed around each of the inner and outer apex angles to form a sufficient predetermined R, and the decorativeness is not impaired. Further, in the latter hot rolling method, which is one of the above-mentioned conventional techniques, the surface pressure applied to the roll hole die is higher than that in plate rolling, and the difference between the material and the roll surface speed greatly differs depending on the location. However, according to the method of the present invention, although the surface of the angle member is roughened by this, it is cold working, the surface pressure applied to the roll hole die is low, and the peripheral speed difference of the roll is small,
Further, between the horizontal upper roll and the inner surface of the intermediate member, the roll surface is smooth, or because the lubricant is rolled between the horizontal upper roll and the left outer surface of the intermediate member while being rolled, It is kept in a low friction state. Therefore, the surface texture of the product angle material is clean and cold rolling is performed, so that the dimensional accuracy is very good. (Manufacturing Method of Plate Bending Channel Material) (First Step) In a method of manufacturing a channel material by bending a plate, one is a cylindrical roll, and the other is a hole type having a flat bottom portion at equally spaced portions from the center. With a two-roll rolling machine having axes parallel to each other, leaving a desired portion in the middle of the sheet metal in the sheet width direction thick as a strip, the thickness of each strip in the center and both sides in the sheet width direction Is subjected to cold working to thin the work and to cause work hardening. As a result of this cold rolling, strip-shaped thick portions are left in the center of the widthwise center, and the central portion and both side portions are thinly rolled into strips, and those portions are work-hardened. The first intermediate member obtained by this cold rolling is a two-roll rolling mill having a small depth of the hole die and therefore a small peripheral speed difference and is cold-rolled, so that seizure or the like occurs. Nor. Therefore, the surface of the first intermediate member is beautiful. (Second step) The first intermediate member, which has been worked and hardened in the first step, has a central portion in the plate width direction as a web portion, and
These two portions were cold-folded so that the two strip-shaped portions that were not work-hardened equidistant from the center in the plate width direction were the corners of the channel material, and both ends were flanges. It is processed into a substantially U-shaped channel material. By this cold rolling, the central portions of the two strip-shaped portions that have not been work-hardened in the sheet width direction are bent, so that the sheets can be smoothly and smoothly bent. Therefore, in the bent second intermediate member, no flaws such as cracks are generated in the bent corner portions. (Third step) In the third step, each inner corner portion formed by each inner side surface of both flange portions of the U-shaped second intermediate member bent in the above step and the inner and lower surfaces of the web portion is predetermined. A horizontal upper roll for rolling to R, a vertical left roll in contact with the left outer surface of the second intermediate member, a horizontal lower roll in contact with the outer and lower surfaces of the web portion of the second intermediate member, and the second intermediate member And a vertical right roll in contact with the right outer side surface of the second intermediate member, the gap between the horizontal upper roll and the horizontal lower roll, and the gap between the horizontal upper roll and the vertical left and right rolls, With respect to the thickness of each flange portion, the U-shaped second intermediate member, which is bent and set in the above-mentioned step by setting it as narrow as surface pressure is applied, is placed between these rolling rolls. Insert into the shape part, roll both inner corners to a predetermined radius, and at the same time, By pressing down each, subjected to rolling to cover the meat shortage of the outer corner. By the flange portion of the horizontal upper roll, both upper end surfaces of the second intermediate member are pressed down, and each excess thickness is moved to a lacking thickness portion of each outer corner angle, so that both outer corner angles are substantially right angles. Or formed into a predetermined R such as 0.5 to 1.0R. (Effect) The channel material 4 manufactured by the conventional forming method has inner and outer corner portions 441, 451 and 4
42 and 452 each do not have a predetermined R, and when used in a corner of a building such as a right-angled corner or a pillar, they had a drawback that the decorativeness was impaired, but the cold rolling method of the present invention When the finishing process is performed, the surface reduction is applied to both upper end faces, so that a surplus of thickness is formed in the inner and outer corner portions of each to form a sufficient predetermined R, and the decorativeness is not impaired. Further, in the latter hot rolling method, which is one of the above-mentioned conventional techniques, the surface pressure applied to the roll hole die is higher than that in plate rolling, and the difference between the material and the roll surface speed greatly differs depending on the location. The surface of the flange portion of the channel material was roughened by this, but according to the method of the present invention, it is cold working, the surface pressure applied to the roll hole die is low, and the peripheral speed difference of the roll is also Also, between the horizontal upper roll and the inner surface of each flange portion of the second intermediate member, the roll surface is smooth, or between the horizontal upper roll and the outer surface of each flange portion of the second intermediate member. Since it is rolled while the lubricant is being supplied in the meantime, it maintains a low friction state. Therefore, the surface texture of the flange portion of the product channel material is clean and cold rolling is performed, so that the dimensional accuracy is very good.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment (method for manufacturing an angle member) according to the present invention will be described with reference to the drawings. (Method of manufacturing angle material) (First step) First, stainless steel (JIS-SUS30
4) having a length of 5400 mm flat steel (plate-shaped metal) having a cross section of 103.8 mm × 6 mm, one of which is a cylindrical roll 50 and the other of which is at the center as shown in FIG. The bottom 52 is a roll 51 having a flat die 53,
With a two-roll rolling machine whose axes are parallel to each other, leave 50 mm thick as a strip in the central portion in the plate width direction, reduce the thickness to 5 mm in each strip for both side portions 61 and 62, and cause work hardening. Cold rolling was performed. The first intermediate member 6 obtained by this cold rolling is a two-roll rolling mill in which the hole 53 has a shallow depth of 1 mm, and therefore the peripheral speed difference is small. It does not cause sticking. Therefore, the surface of the first intermediate member 6 was beautiful. (Second step) The first intermediate member 6 worked and hardened in the first step is a convex roll having one right-angled top portion and the other is a right-angled V-shaped roll. In a parallel two-roll rolling mill, as shown in FIG. 1B, the strip-shaped portion 6 in which the work-hardening of the central portion in the sheet width direction has not occurred.
The central part of 0 is set to the apex angle 63 of the angle member,
It was bent cold to form an L-shape of about 90 °. By this cold rolling, the strip-shaped portion 63, which has not been work-hardened, in the central portion in the plate width direction is bent, so that the bending can be smoothly performed without difficulty. Therefore, in the bent second intermediate member 64, no flaw such as a crack was generated in the bent top portion 63. (Third step) As shown in FIG. 1C, a four-roll rolling machine parallel to each other vertically and horizontally with respect to the L-shaped second intermediate member 64 of about 90 ° obtained in the plate bending step is used. To
A horizontal upper roll 10 for rolling the inner apex angle portion 631 to 4R, a vertical left roll 11 contacting the left outer surface 652 of the second intermediate member 64, and a horizontal left contacting the outer lower surface 662 of the second intermediate member 64. Using the lower roll 12 and the vertical right roll 13 that contacts the right lower end surface 68 of the second intermediate member 64, the inner and outer apex angle portions 631 and 632 are respectively 4R and 1R.
Simultaneously with the rolling, the upper end surface 67 and the lower end surface 68 are pressed by the flange portion 102 of the horizontal upper roll 10 and the vertical right roll 13 by 1.9 mm to cover the lack of meat at the apex angle 632. Processed. Since the product 7 obtained in the third step has the work-hardened regions 61 and 62 applied in the first step, the apex angle portions 7 on both inner and outer sides are formed.
31 and 732 are prevented from widening, and each end 77,
Movement of meat in the 78 direction is also suppressed. Therefore, the angle member 7 having the predetermined 4R and 1R formed on the inner and outer apex angle portions 731 and 732, respectively, was obtained. (Effect) In the angle member 2 produced by the conventional forming method, the inner and outer apex angle portions 201 and 202 do not have predetermined R, and the right angle corner portion of the building,
When used in the corners of columns or the like, it had a drawback that the decorativeness was impaired. However, if the cold rolling method of this embodiment is used for finishing, the flange portions of the horizontal upper roll 10 are formed on both end surfaces 67 and 68. 102 and the vertical right roll 13 apply surface pressure reduction respectively, so that the inner and outer apex angle portions 731 and 732 of the respective
In addition, the surplus meat is rotated to form sufficient predetermined 4R and 1R, and the decorativeness is not impaired. In the latter hot rolling method, which is one of the above-mentioned conventional techniques, the surface pressure applied to the roll hole die is higher than that in sheet rolling, and the difference between the material and the roll surface speed greatly differs depending on the location. However, according to the method of the present invention, cold working is performed, the surface pressure applied to the roll hole dies 53 and 101 is low, and the peripheral speed difference between the rolls is small. In addition, the horizontal upper roll 10 and the inner side surfaces 651, 6 of the second intermediate member 64
Also between 61 and 61, the roll surface is smooth, or the horizontal upper roll 10 and the respective outer side surfaces 652, 6 of the second intermediate member 64.
Since it is rolled while the lubricant is being supplied between 62 and 62,
It is kept in a low friction state. Therefore, the product angle material 7
Since the surface texture is clean and it is cold-rolled, it has very good dimensional accuracy. (Manufacturing Method of Channel Material) In this second embodiment (manufacturing method of channel material), as shown in FIG.
Next, after bending and molding a channel material having a flange portion slightly longer than the product in advance, only each end surface of both flange portions is cold pressed to form a channel material having a predetermined R in the inside and outside corners. It is a manufacturing method. (First step) First, stainless steel (JIS-SUS30
4) length 5400 mm, cross section 207.6 mm
2 rolls of flat steel (plate metal) with a diameter of 6 mm, one of which is a cylindrical roll and the other of which is a roll having a flat bottom portion at equally spaced locations from the center, the axes being parallel to each other 2A, as shown in FIG. 2A, a portion of the flat steel 25 mm from the center 80 in the width direction is strip-shaped 81 of 50 mm,
82 with a thickness of 6 mm left, and a central portion 8 in the width direction.
50 mm of 0 and 25 mm each of both side portions 83 and 84
On the other hand, each band was thinly cold-worked to a thickness of 5 mm. As a result, the thinly cold worked parts 80, 8
No. 3, 84 caused work hardening. The first intermediate member 8 obtained by this cold rolling has a hole depth of 1 m.
Since this is a two-roll rolling mill having a small depth of m, and therefore having a small difference in peripheral speed, and is performed in cold, seizure and the like did not occur. Therefore, the surface of the first intermediate member 8 was beautiful. (Second step) For the first intermediate member 8 processed and hardened in the first step, 100 mm of the central portion 80 in the plate width direction
A web portion 90, and two strip-shaped portions 81 which are not work-hardened at an equal distance from the center 80 in the plate width direction,
Each central portion of the channel member 9 is connected to each corner portion 95, 96 of the channel member 9.
As described above, these portions 95 and 96 were cold-bent to form a channel material 9 having a substantially U-shaped cross section (see FIG. 2B). By this cold rolling, the central portions of the two strip-shaped portions 81 and 82, which are not work-hardened in the sheet width direction, are bent, so that they can be smoothly and smoothly bent. Therefore, in the bent second intermediate member 9, no flaws such as cracks were generated in the bent corner portions 95 and 96, respectively. (Third step) In the third step, the inner side surfaces 911 and 921 of both flange portions 91 and 92 of the intermediate member 9 and the web portion 90 are processed.
Each inner corner portion 95, 96 formed by the inner lower surface 901 of the
A horizontal upper roll 10 for rolling into a strip, a vertical left roll 11 in contact with the left outer surface 912 of the second intermediate member 9, and a horizontal lower roll 12 in contact with the outer lower surface 902 of the web portion 90 of the second intermediate member 9. And the vertical right roll 13 in contact with the right outer side surface 922 of the second intermediate member 9, the gap between the horizontal upper roll 10 and the horizontal lower roll 12, and the horizontal upper roll 10 and the vertical left rolls 11 and 13. Each gap of the second
Thickness of the web part 90 of the intermediate member 9 and each flange part 9
The thickness of 1 and 92 is set as narrow as possible by applying surface reduction, and the second intermediate member 9 is inserted into the U-shaped portion surrounded by these rolling rolls 10, 11, 12, 13 and the like. Then, both inner corner portions 951 and 961 are rolled to a predetermined radius R, and at the same time, both upper end surfaces 97 and 98 are pressed by the collar portions 101 and 102 of the horizontal upper roll 1.9 mm to form the outer corner angle 952. , 962 to 4R was rolled to cover the lack of meat. By this rolling process, the collar portions 101, 10 of the horizontal upper roll 10 are
2, the upper end surfaces 97 and 98 of the U-shaped intermediate member 9 are pressed down, and the surplus thickness is changed to the outer corner angles 952 and 9 respectively.
62 is moved to the lacking meat portion, and both outer corner angles 952, 96
2 was formed into 4R. Product 1 obtained by this roll forming
No. 00 has a thickness of 5 mm, each flange portion 103, 104 is 50 mm, inner corner angles 1061, 1071 are 1R, and outer corner angle 1
062 and 1072 are 4R equilateral flanges 103 and 104
The surface texture of the channel material 100 was excellent, and the dimensional accuracy was extremely good. (Effect) The channel material 4 manufactured by the conventional forming method has inner and outer corner portions 441, 451 and 4
42 and 452 each do not have a predetermined R, and when used in corners such as right-angled corners of buildings, corners of columns, etc., they had the drawback of impairing decorativeness, but cold rolling of this example If finishing is performed by the method, both upper end faces 108, 1
09 is subjected to surface pressure reduction of the collar portions 101 and 102, respectively, so that the inner and outer corner portions 1061 and 107 of the respective collar portions
Sufficient R for 1,1062,1072 with excess thickness
Are formed and the decorativeness is not impaired. In the latter hot rolling method, which is one of the above-mentioned conventional techniques, the surface pressure applied to the roll hole die is higher than that in sheet rolling, and the difference between the material and the roll surface speed greatly differs depending on the location. The surface of the flange portions 41 and 43 of the channel member 4 is roughened by this, but according to the present embodiment, it is cold working, the surface pressure applied to the roll hole die is low, and the peripheral speed of the roll is low. The difference is small, and the inner surfaces 911 and 921 of the flanges 91 and 92 of the horizontal upper roll 10 and the second intermediate member 9 are small.
And the roll surface is smooth, and the horizontal upper roll 10 and the flange portions 91, 92 of the second intermediate member 9 are
Since the lubricant is rolled between the outer surfaces 912 and 922 of the sheet, it is kept in a low friction state. Therefore, the flange portions 103, 10 of the product channel material 100
Since the surface texture of No. 4 was clean and it was cold-rolled, the dimensional accuracy was very good.

[Brief description of drawings]

FIG. 1 is a drawing for explaining the manufacturing process of the first embodiment of the angle member of the present invention.

FIG. 2 is a drawing for explaining the manufacturing process of the second embodiment of the channel material of the present invention.

FIG. 3 is a diagram for explaining forming of a conventional angle material by a forming method.

FIG. 4 is a drawing for explaining molding of a conventional channel material by a forming method.

[Explanation of symbols]

2 Conventional angle member 20, 21 Forming roll 201, 202 Inner / outer vertical angle portions 30, 31 Conventional channel material Forming roll 32, 34 Flange portion 33 Web portion 4 Conventional method channel material 50, 51 2 rolls 52 that causes work hardening of the present invention 52 bottom 53 hole type 6 first intermediate member for manufacturing angle materials 60 strip-shaped portions that have not undergone work hardening 61, 62 work hardened end portions 63 top corners 64 angle material manufacturing Second intermediate member 7 product angle material 73 apex angle 77, 78, 97, 98 end surface 95, 96 corner portion 10, 11, 12, 13 4 roll mill roll 100 product channel material 101, 102 horizontal upper roll Collar part 108, 109 End surface of channel material

Claims (2)

[Claims] 1. A method for manufacturing an angle member by bending a plate, wherein a desired portion in a plate width direction middle portion of the plate-shaped metal material is left thick as a band, and both side parts are made thinner in each band shape. And a first step of performing cold working to cause work hardening, and an angle member at the central portion of the band-shaped portion in the middle of the width direction of the first intermediate member that has been work hardened in the first step The second step of cold bending into a substantially L-shape so that the vertical angle of the second intermediate member is approximately R-shaped, Using a horizontal upper roll for rolling into, a vertical left roll in contact with the left outer surface of the intermediate member, a horizontal lower roll in contact with the outer and lower surfaces of the intermediate member, and a vertical right roll in contact with the lower right surface of the intermediate member , The inside and outside apex angle part is a predetermined R
And a third step of simultaneously performing cold rolling to cover the lack of meat at the apex angle by pressing each of the upper end face and the lower end face at the same time as Method. 2. A method for manufacturing a channel material by bending a plate, wherein a desired portion in the middle of the plate width direction of the plate-shaped metal material is left thick in a strip shape, and
A first step of performing cold working to reduce the thickness of each band and to cause work hardening, and no work hardening in the width direction middle of the first intermediate member work hardened in the first step. The middle part of the strip,
In the final step, both side parts are made into both flange parts of the channel material and each part to be the web part, and are cold-folded into a substantially U-shape so that each boundary part has each corner angle. 2 steps, a horizontal upper roll for rolling each inner corner portion of both flange portions and the web portion of the substantially U-shaped second intermediate member obtained in the plate bending step to a predetermined R, and an intermediate member Using a vertical left roll in contact with the outer surface of the left flange part of the, a horizontal lower roll in contact with the outer and lower surfaces of the web part of the intermediate member, and a vertical right roll in contact with the right outer surface of the right flange part of the intermediate member, At the same time as rolling the corner portion to a predetermined R, the third step of pressing the upper end faces by the stepped horizontal upper rolls and performing cold rolling to cover the lack of meat at each outer corner angle. Made of plate bending channel material characterized by Build method.