JPH06170405A - Method for cold rolling blank-bent angle bar - Google Patents

Abstract

PURPOSE:To provide a method for manufacturing an equal or unequal angle bar having a prescribed internal or external apex angle on a corner radius by cold rolling after bending a steel sheet. CONSTITUTION:This method is a cold rolling method for an angle bar 1 composed of a blank bending stage to bend a blank in an L shape and a cold finishing stage to finish an L shape intermediate member obtained in the blank bending stage in a cold state. In the finishing stage, at the same time that an internal apex angle part is rolled in a prescribed radius by using a horizontal roll 4 to roll an internal apex angle part 37 made by an inside surface 31 and an inner lower surface 32 into a prescribed radius, a vertical left roll 5 abutting on the outside surface 33 of the intermediate member, a horizontal lower roll 6 abutting on the outer lower surface 34 of the intermediate member and a vertical right roll 7 to work a lower end face 36 of the intermediate member in an orthogonal state, each side part of both or one of the end face 35 of the upper part and the end face of the lower part or each side part of the L shape part is pressed down and rolling is performed to cover the shortage of the thickness of the external apex angle.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an equilateral or unequal side angle member. [0002] Conventionally, as a method of manufacturing an angle member,
Two main methods are known. The first method is a forming method for manufacturing the angle member shown in FIG. 6 by bending a substantially central portion of a long thin metal flat plate with a roll as shown in FIG. 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. However, the above-mentioned conventional method for manufacturing an angle member has the following problems. That is, the former forming method is a method in which a flat metal plate is directly formed into an angle material 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.
The flat metal plate is rolled at a right angle between 1 and 1. However, in this method, as shown in FIG.
Only the angle materials 3 which are not intended for R (roundness) were obtained for Nos. 2 and 3, respectively. Moreover, as shown in FIG. 6, the angle member 3 manufactured by the above forming method is used.
In the case of 0, the inner and outer apex angle portions 301 and 302 do not have predetermined R, so that the decorativeness is impaired when used for corners such as right-angled corners of buildings, handrails, and pillars. 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 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. The gist of the present invention is as follows. That is, an angle member of a plate bending step of bending a plate-shaped metal material into a substantially L shape and a cold finish processing step of cold finishing the substantially L-shaped intermediate member obtained in the plate bending step. In the cold rolling method, the finishing step includes a horizontal upper roll for rolling an inner apex angle portion formed by the inner side surface and the inner lower surface of the intermediate member into a predetermined R, and a vertical contacting the outer side surface of the intermediate member. Using a left roll, a horizontal lower roll that contacts the outer lower surface of the intermediate member, and a vertical right roll that processes the lower end face of the intermediate member at a right angle, the inner apex angle portion is rolled to a predetermined R, and at the same time, the upper end face is rolled. Both or one of the lower end faces or one of the lower end faces, or each of the L-shaped side portions is pressed to perform rolling to cover the lack of meat at the apex angle. The structure of the roll for pressing down the upper end face is sufficient if the horizontal upper roll has a flange portion for processing the upper end face at a right angle, or the vertical left roll is provided with a step for the same purpose. The portion of the horizontal upper roll that contacts the inner surface of the intermediate member is formed by mirror finishing in a low friction state, or the portion of the horizontal upper roll that contacts the inner surface of the intermediate member and the intermediate member. A low friction state is achieved by supplying a lubricant between the both. In the above description, the terms such as left, right, up and down are used for the sake of convenience of explanation, and the functions are the same even if they are reversed. Further, although the following Examples 1 to 3 describe a method for manufacturing an equilateral angle material, it is also possible to manufacture an isosceles angle material by using an equilateral medium member or an unequal material. . [Operation and effect] First, a forming process of bending a plate-shaped metal material into a substantially L-shape is performed. Then, the intermediate L-shaped intermediate member obtained in the plate bending step is subjected to a cold finishing step in which the intermediate member is cold finished. The finishing step includes a horizontal upper roll for rolling the inner apex angle portion formed by the inner side surface and the inner lower surface of the intermediate member into a predetermined R, a vertical left roll in contact with the outer side surface of the intermediate member, and the intermediate member. Using a horizontal lower roll in contact with the outer lower surface and a vertical right roll that processes the lower end surface of the intermediate member at a right angle, insert the cold intermediate member into the L-shaped portion surrounded by these. At the same time, the inner apex angle portion is rolled to a predetermined radius, and at the same time, both or one of the upper end face and the lower end face, or each L-shaped side is pressed to cover the lack of meat at the outer apex angle. Give. With the flange or step and the vertical right roll, press both or one of the upper end face and the lower end face to move the surplus to the meat lacking part of the apex angle to make the apex angle substantially right angle. Alternatively, it is formed into a predetermined R such as 0.5 to 1.0R.
Further, the gap between the horizontal upper roll and the horizontal lower roll, and the gap between the vertical left roll and the vertical right roll, with respect to the thickness of each side portion of the intermediate member, are set as narrow as the surface pressure is applied, and placed. The intermediate member is inserted between these rolling rolls, surface reduction is applied to each side of the intermediate member, and the surplus thickness is moved to the outer apex angle portion to cover the shortage of the outer apex angle portion. Angle material 3 produced by the conventional forming method
0 has a drawback that the interior and outer apex angles 301 and 302 do not have a predetermined radius R, so that the decorativeness is impaired when used for corners such as right-angled corners of buildings, handrails, and pillars. However, if finish processing is performed by the cold rolling method of the present invention, surface reduction is applied, or surface reduction is applied to the upper end face or the lower end face, so that the inner and outer apex angle portions have excess thickness. And a sufficient R is obtained, 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, the surface pressure applied to the roll hole die is low, the peripheral speed difference between the rolls is small, and the horizontal upper roll and the intermediate member have Between the inner surface,
Since the roll surface is a mirror surface or is rolled while a lubricant is supplied between the roll surface, the roll surface 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. [Embodiment 1] Next, a first embodiment of the present invention will be described with reference to the drawings. In this embodiment, a slightly longer one side portion 31 is previously prepared by the forming apparatus shown in FIG.
After forming the unequal side angle member 30 having 0, as shown in FIG. 1, only the end surface 35 of the one side portion 310 is cold pressed to form the one side portion 110 of the equal side, as shown in FIG. Is a method for manufacturing the equilateral angle member 1. In the above manufacturing, first, stainless steel (JIS-S
The section of flat steel plate (metal flat plate) made of US304) having a length of 5400 mm, which is offset by 4.0 mm from the central portion in the plate width direction of 104.0 mm × 6 mm, is bent by a conventional apparatus as shown in FIG. Processed. And FIG.
As shown in (a), the apex angle portions 37 and 38 are 9R each.
The unequal side angle material 30 was obtained. Next, the finishing step is performed on the intermediate member 30 by the four-direction simultaneous rolling mill as shown in FIG. This is the inner apex angle portion 37 formed by the inner side surface 31 and the inner lower surface 32 of the intermediate member 30.
The upper horizontal roll 4 for rolling to a predetermined 4R, the vertical left roll 5 contacting the outer surface 33 of the intermediate member 30, the horizontal lower roll 6 contacting the outer lower surface 34 of the intermediate member 30, and the lower part of the intermediate member 30. Using the vertical right roll 7 that regulates the end face 36 in a right angle shape, the inner apex angle portion 37 is rolled to 4R, and at the same time, the upper end face 35 is pressed to perform a rolling process to cover the lack of meat at the outer apex angle 38. Give. In this case, the horizontal upper roll 4 is formed with a flange 43 for pressing down the upper end surface 35 of the intermediate member 30, and the flange portion 4 is formed.
In step 3, the longer one side portion 310 of the intermediate member 30 which is the unequal side angle member is pressed in the directions of the apexes 37 and 38, and the angle member 1 having the equal sides 110 and 120 is formed by cold rolling. In addition, the inner surface portion 31 of the intermediate member 30
The portion 42 of the horizontal upper roll 4 that abuts against the intermediate member 30 is formed in a mirror surface, and in the gap between the intermediate member 30 and the portion 42 where the horizontal upper roll 4 abuts the inner side surface portion 31 of the intermediate member 30 during rolling. A well-known lubricant is added to achieve a low friction state. The product 1 obtained by this roll forming has a thickness of 6 mm and each side 110, 12 as shown in FIG.
0 is 50mm each, inner angle 17 is 4R, outer angle 18
1R is an equilateral angle member 1 and was formed by cold rolling, so the surface texture was clean and the dimensional accuracy was also very good. Second Embodiment Next, a second embodiment according to the present invention will be described with reference to the drawings. In this embodiment, the plate material is preliminarily bent by the forming apparatus shown in FIG. 5 to form the equilateral angle material 30 shown in FIG. 3 (a), and then both sides thereof are rolled by the rolling machine shown in FIG. Part 31
This is a method for manufacturing the equilateral angle member 1 as shown in FIG. 3B by cold pressing the respective end faces 35, 36 of 0, 320. In the above production, first, a flat steel plate (metal flat plate) made of stainless steel (JIS-SUS304) and having a length of 5400 mm has a cross section of 104.0 mm × 6 mm in the center portion in the plate width direction by a conventional device as shown in FIG. Plate bending was performed. Then, as shown in FIG. 3A, the apex angle portions 37 and 38 are 9R, respectively, and in FIG. 3A, the lengths of the side portions 310 and 320 of the intermediate member 30 are equal sides of 51.9 mm, respectively. The angle material 30 was obtained. Next, the finishing step is performed on the intermediate member 30 by using a rolling mill as shown in FIG. This is the inner apex angle portion 3 formed by the inner side surface 31 and the inner lower surface 32 of the intermediate member 30.
The horizontal upper roll 4 for rolling 7 into a predetermined 4R, the vertical left roll 5 contacting the outer surface 33 of the intermediate member 30, the horizontal lower roll 6 contacting the outer lower surface 34 of the intermediate member 30, and the intermediate member 30. Using the vertical right roll 7 that processes the lower end face 36 into a right angle, the inner apex angle portion 37 is rolled to 4R, and at the same time, both the upper and lower end faces 35 and 36 are directed to the inner and outer apex angles 37 and 38. It is pressed and rolled to cover the lack of meat at the apex angle 38. In this case, the horizontal upper roll 4 has a collar 4 for pressing the upper end surface 35.
3 is formed, and the flange portion 43 presses the one side portion 310 of the intermediate member 30 toward the vertical angles 37 and 38, while the other side portion 320 is also pressed by the vertical right roll 7.
This was pressed down in the directions of the apexes 37 and 38, and the equilateral angle material 1 was formed by cold rolling. Further, the portion 42 of the horizontal upper roll 4 that abuts the inner side surface of the intermediate member 30 is formed into a mirror surface, and at the time of rolling, the portion 42 that abuts the inner side surface of the horizontal upper roll 4 and the intermediate member 30. A well-known lubricant is added to the gap between and so as to achieve a low friction state. The product 1 obtained by this roll forming has a thickness of 6 m.
m, each side 110, 120 is 50 mm, the inner apex angle is 1
No. 7 was 4R and the apex angle 18 was 1R, and the equilateral angle member 1 had a clean surface and very good dimensional accuracy. Third Embodiment Next, a third embodiment of the present invention will be described with reference to the drawings. In this embodiment, the plate material is preliminarily bent by the forging apparatus shown in FIG. 5 to form the equilateral angle material 30 as shown in FIG. 4A, and then the rolling machine shown in FIG. 1 is used. , Both sides 3
Push each end face 35, 36 of 10, 320 cold,
This is a method of manufacturing the angle member 1 having equilateral sides 110 and 120 as shown in FIG. In the above production, first, a flat steel (metal flat plate) having a length of 5400 mm and made of stainless steel (JIS-SUS304) has a cross section of 102.0.
The central portion of the plate having a size of mm × 6.3 mm in the plate width direction was subjected to plate bending with a conventional device as shown in FIG. And the apex part 3
7 and 38 were equilateral angle members 30 each having 9R.
Next, the finishing process is performed on the intermediate member 30 by the rolling mill shown in FIG. This is the inner apex angle portion 3 formed by the inner side surface 31 and the inner lower surface 32 of the intermediate member 30.
The horizontal upper roll 4 for rolling 7 into a predetermined 4R, the vertical left roll 5 contacting the outer surface 33 of the intermediate member 30, the horizontal lower roll 6 contacting the outer lower surface 34 of the intermediate member 30, and the intermediate member 30. Using the vertical right roll 7 that processes the lower end surface 36 into a right angle, the inner apex angle portion 37 is rolled to 4R, and at the same time, the L-shaped side portions 310 and 320 are directed to the inner and outer apex angles 37 and 38 directions. Then, rolling is performed to cover the lack of meat at the apex angle 38. Also, horizontal top roll 4
And the horizontal lower roll 6 and the vertical left roll 5 and the vertical right roll 7 are separated by the sides 31 of the intermediate member 30.
The thickness of each of the rolling rolls 4 and 6 of 0 and 320 is set to 6.0 mm, which is narrower by applying surface reduction.
And side parts 31 of the intermediate member 30 inserted between
Applying surface pressure reduction to 0 and 320, and removing the excess thickness from the external angle 3
8 to cover the lack of meat in the apex angle portion 38. Further, a portion 42 of the horizontal upper roll 4 that abuts on the inner side surface portion 13 of the intermediate member 4 is formed into a mirror surface, and at the time of rolling, a portion 42 that abuts on the inner side surface portion 13 of the horizontal upper roll 4 and an intermediate portion. A well-known lubricant is added to the gap between the member 30 and the member 30 so that the frictional state is kept low. The product 1 obtained by this roll forming has a uniform thickness of 6 mm on each side 110 and 120, 50 mm on each side 110 and 120, and an inner apex angle of 1
7 is 4R and the outer angle 18 is 1R and is an equilateral angle member 1, and since it was formed by cold rolling, the surface texture was beautiful and the dimensional accuracy was very good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a finish rolling mill for angle members according to an embodiment. FIG. 2 is a front sectional view of an intermediate member and a product according to the first embodiment. FIG. 3 is a front sectional view of an intermediate member and a product according to the second embodiment. FIG. 4 is a front sectional view of an intermediate member and a product of Example 3. FIG. 5 is a front view of manufacturing a plate bending angle member by the foaming method. FIG. 6 is a front cross-sectional view of a plate bending angle member by the foaming method. [Explanation of symbols] 1 product angle material 11, 13 inner / outer surface 12, 14 inner / outer lower surface 15, 16 upper / lower end surface 17, 18 inner / outer apex angle 110, 120 angle material one side, other side Part 20, 21 Rolling roll 3 by forming method Plate bending angle member by forming method 301, 302 Inner / outer apex angle 31, 33 of the above angle member Inner / outer side surface 32, 34 Inner / outer lower surface 35, 36 Upper / lower end surface 37, 38 Inner / outer apex angle 4 Horizontal upper roll 41 Outer lower surface of the roll 42 Outer surface 43 of the roll 43 Collar part 5 of the roll Vertical left roll 51 Outer surface 6 of the roll Horizontal upper roll 61 Outer surface of the roll 7 Vertical right roll 71 Outside surface of the above roll

Claims (1)

What is claimed is: 1. A plate bending process for bending a plate-shaped metal material into a substantially L shape, and a cold finishing process for cold-finishing a substantially L-shaped intermediate member obtained in the plate bending process. In the cold rolling method of the angle material, the finishing step includes a horizontal upper roll for rolling the inner apex angle portion formed by the inner side surface and the inner lower surface of the intermediate member to a predetermined R, and the outer side of the intermediate member. A vertical left roll that touches the side,
Using a horizontal lower roll that contacts the outer and lower surfaces of the intermediate member, and a vertical right roll that processes the lower end surface of the intermediate member at a right angle,
At the same time as rolling the inner apex angle portion to a predetermined radius, rolling processing to cover both or one of the upper end face and the lower end face or each L-shaped side portion to cover the lack of meat at the outer apex angle. A method for cold rolling a bent sheet material, which is characterized in that it is applied.