JPH08155501A - Method and equipment for manufacturing angle - Google Patents

Abstract

PURPOSE: To provide a method and equipment for manufacturing angles capable of stably manufacturing angles of a number of sizes using one kind of grooved rolls. CONSTITUTION: Mountain-shaped angles are manufactured out of a round stock through a plurality of rolling passes using a plurality of stands consisting of a pair of upper and lower grooved rolls. In the first rolling pass, a center groove is formed at the position corresponding to the inner angle top part of the angle to the round stock by a first lower grooved roll 12. Between a first stand 10 and a second stand, an intermediate formed product is fed to the second stand while the wing part at each end part of the intermediate product formed by the first stand 10 is restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an angle manufacturing method,
In particular, it relates to a method of manufacturing an angle using a round material.

[0002]

2. Description of the Related Art As shown in FIG. 16, a mountain shape having two side portions, one side portion 91 and the other side portion 92, has an apex corner portion 93 on the outside and an inside corner apex portion 94 on the inside, which contact each other. The angle 90 is used in various places, and its size (width, thickness, etc.) varies widely. Further, in manufacturing an angle, a manufacturing apparatus in which a plurality of stands each having a pair of an upper roll hole type and a lower roll hole type having an optimum shape for the size of the angle to be obtained are connected to each other is used as a material. Is usually rolled multiple times.

Therefore, when manufacturing angles of various sizes using the manufacturing apparatus, a pair of upper and lower roll hole molds used for the plurality of stands are prepared by the number of sizes of angles to be manufactured. Then, a pair of exclusive upper and lower roll hole dies suitable for the size of the angle to be manufactured is set on each stand and rolled multiple times as described above.

[0004]

However, the above conventional angle manufacturing method and apparatus have the following problems. That is, every time the size of the angle to be manufactured is changed, it is necessary to perform a setup change operation of changing the roll hole die of each stand. Therefore, work efficiency deteriorates. Also, the number of spare roll hole types required is large. Therefore,
As a result, it costs a lot of money and the manufacturing cost becomes high.

When manufacturing an angle using a round material, centering in the width direction is difficult because the material is circular. Therefore, variations in the sizes of the width and the like of one side and the other side of the obtained angle are likely to occur. Especially when trying to reduce the total number of passes by applying high pressure in the first rolling pass,
The desire for size stability is even more difficult.

[0006] Further, the rolled material to be rolled is liable to be laterally swayed, twisted or the like, especially under high pressure. Therefore, rolling stability may be impaired. As a countermeasure against this, for example, the entrance guide shown in Japanese Utility Model Laid-Open No. 127605/1990 is proposed. However, this entrance guide is not optimal because its structure is more complicated than the conventional one and the required cost is high.

The present invention has been made in view of the above conventional problems, and a method of manufacturing an angle capable of stably manufacturing angles of various sizes by using one type of roll hole type. It is intended to provide a manufacturing apparatus.

[0008]

According to the present invention, there is provided a method for manufacturing a mountain-shaped angle from a round material by a plurality of rolling passes using a plurality of stands each having a pair of an upper roll hole type and a lower roll hole type. During the first rolling pass, a mountain shape is formed on the round material in the portion corresponding to the apex angle portion of the angle by the first roll hole die, while the inner angle of the angle is formed by the first lower roll hole die. A method of manufacturing an angle is characterized in that a central groove is formed at a position corresponding to the top.

What is most noticeable in the present invention is that the center groove is formed in the round material by the first lower roll hole die in the first pass. Then, the material is rolled at each stand in order to bring it closer to the shape of the angle to be obtained. That is, in the first stand, which is the most upstream stand, the round material is rolled into the intermediate molded product as a first rolling pass. Thereafter, the second rolling pass is sequentially performed on the second stand, the third rolling pass is performed on the third stand, and the angle is obtained by a plurality of rolling passes on a plurality of stands.

Further, between the first stand and the second stand, the intermediate molded product is sent to the second stand while restraining the wing portions at both ends of the intermediate molded product molded by the first stand. Preferably. By this,
Even if a high pressure is applied to the first stand, the intermediate molded product is prevented from wobbling on the left and right and twisted, and is smoothly sent to the second stand. Therefore, a more stable rolling state can be obtained in the second stand.

As an apparatus for carrying out the above angle manufacturing method, a plurality of stands having a pair of an upper roll hole type and a lower roll hole type are used and a plurality of rolling passes are used to form an angle angle more than a round material. In the apparatus for manufacturing the above, the first upper roll hole die in the first first stand has an angle of 90 °.
The first lower roll hole die in the first stand has a forming recess of ~ 120 degrees, and a protrusion for forming a central groove at a position corresponding to the inner corner apex of the angle with respect to the round material. , Having horizontal portions on both sides of the protrusion, and for restraining the wing portions at both ends of the intermediate molded product molded by the first stand between the first stand and the second stand There is an angle manufacturing apparatus characterized in that a pair of guide rollers having the above-mentioned guide grooves are arranged.

What is most noticeable in the manufacturing apparatus of the present invention is that the first upper roll hole die has a forming recess of the angle, and the first lower roll hole die has the protrusion and the horizontal portion. And that the first upper roll die has a forming recess with an angle of 90 to 120 degrees.
And, between the first stand and the second stand,
The above-mentioned pair of guide rollers are provided.

If the angle is less than 90 degrees, there is a problem that the material cannot be sufficiently flowed into the apex portion and the forming of the apex portion in the subsequent steps is hindered.
If it exceeds 0 degrees, there is a problem that the action of centering (centering) the round material becomes weak. Further, the pair of guide rollers are provided so that the interval can be changed according to the width of the intermediate molded product.
The guide groove of the guide roller has substantially the same shape as the cross-sectional shape of the wings at both ends of the intermediate molded product (see FIG. 4), and is provided so that the intermediate molded product can be constrained in the vertical direction. .

It is preferable that the first lower roll hole type protrusion has a radius of curvature of 1 to 1.5 times the radius of curvature of the second lower roll hole type protrusion in the second stand. As a result, the center groove of the intermediate molded product has a shape that facilitates fitting with the tip of the protrusion of the second lower roll hole type. Therefore, the tip end of the protrusion of the second lower roll hole type fits smoothly into the center groove of the intermediate molded product. Therefore,
In the second stand, centering (intermediate positioning) of the intermediate molded product in the width direction can be performed more easily. If the above-mentioned magnification is less than 1 time, there is a problem that the intermediate molded product and the tip of the protrusion of the second lower roll hole die are difficult to fit together. There is a problem that stable centering cannot be performed because the gap between the lower roll hole type protrusion is large.

The height of the protrusion of the first lower roll hole type (see FIG. 1, symbol H) is the same as that of the horizontal portion of the first lower roll hole type and the above of the first upper roll hole type. It is preferably 5 to 25% of the longest distance L from the top of the recess (see FIG. 1). Accordingly, in the first stand, the center groove can be provided at a position corresponding to the inner corner apex of the angle without impairing the centering effect of the first upper roll hole type round material.

That is, if it is less than 5%, there is a problem that it is difficult to stably guide the center groove of the intermediate molded product to the protrusion of the second lower roll hole mold, while if it is 25% or more. In this case, there is a problem that it is difficult to maintain the centering of the round material when forming the center groove in the first stand.

The guide roller preferably has a plurality of types of the guide grooves (see FIG. 15). As a result, when manufacturing angles of different sizes in succession, the optimum guide groove can be selected without replacing the guide roller. That is, by changing the distance and height of the pair of left and right guide rollers, the guide groove can be changed to another shape.

Further, three or more stands are provided, and between the stands, a pair of guide rollers having guide grooves for guiding the blades at both ends of the intermediate molded product molded in the previous step. Is preferably provided. As a result, even in a manufacturing apparatus having three or more stands, it is possible to suppress twisting and lateral deflection of the intermediate molded product between the stands, and to perform stable rolling.

[0019]

In the angle manufacturing method of the present invention, the central groove is formed in the round material during the first rolling pass. Therefore, when rolling in the second stand, a centering force is generated so that the tip of the protrusion of the second lower roll hole type tries to enter the center groove. Therefore, in the second stand, centering of the intermediate molded product can be easily performed, and a stable rolled state can be obtained.

Therefore, an angle with high dimensional accuracy can be obtained by the above-described excellent centering effect and realization of a stable rolling state. Therefore, by changing the dimensions of the round material and adjusting the gap between the upper roll hole type and the lower roll hole type in each stand, it is possible to stably manufacture angles of various types.

Further, particularly in the manufacturing apparatus of the present invention,
The first upper roll hole die has a forming recess having an angle of 90 to 120 degrees, and the first lower roll hole die has the protruding portion. Therefore, the top surface of the intermediate molded product has a chevron shape.
The center groove can be easily provided on the lower surface.

The guide groove is provided in the guide roller. Therefore, the guide roller can restrain the intermediate molded product not only in the horizontal direction but also in the vertical direction. Therefore, it is possible to reliably suppress the runout and twist of the intermediate molded product. Therefore, as described in the method of manufacturing an angle, it is possible to stably manufacture angles of various sizes by using one type of roll hole mold.

As described above, according to the present invention, it is possible to provide an angle manufacturing method and manufacturing apparatus capable of stably manufacturing angles of various sizes by using one type of roll hole die. .

[0024]

【Example】

Example 1 A method of manufacturing an angle and an apparatus therefor according to an example of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3 and 5, the angle manufacturing apparatus 1 of this example includes three stands each having an upper roll hole type and a lower roll hole type as a pair.
By using the table, that is, the first to third stands 10, 20, and 30 for three rolling passes, a mountain-shaped angle 45 (FIG. 6d) is manufactured from the round material 15 (FIG. 6a) by a so-called straight type. It is a device.

As shown in FIG. 1, the first upper roll hole die 11 in the first stand 10 has a forming recess 110 having an angle D of 105 degrees. Further, as shown in FIG. 1, the first lower roll hole die 12 in the first stand 10 has a central groove at a position corresponding to the inner corner apex 450 of the angle 45 (FIG. 6d) with respect to the round material 15 (FIG. 6a). 250 (Fig. 6b)
And a horizontal portion 122 on both sides of the protrusion 120.

Further, as shown in FIGS. 4 and 5, between the first stand 10 and the second stand 20, an intermediate molded product 25 formed by the first stand 10 (FIG. 6b).
Is provided with a pair of guide rollers 7 having guide grooves 72 for restraining the wing portions at both ends thereof. Guide groove 7 above
As shown in FIG. 4, 2 is provided at the center of the roller portion 70 arranged at the center of the shaft portion 73. In addition, as shown in FIG. 5, the guide roller 7 is mounted on the second stand 20.
In order to restrain the wings on both ends of the second intermediate molded product 35 (FIG. 6c) molded by
It is also arranged between itself and the stand 30.

The guide rollers 7 are arranged so that their intervals can be arbitrarily changed according to the width of the intermediate molded product (not shown). The guide groove 72 has substantially the same shape as the wing portion of each intermediate molded product, and is provided so that each wing portion can be restrained. That is, FIG.
As shown in FIG. 5, the guide groove 72 in the guide roller 7 between the first stand 10 and the second stand 20 has substantially the same shape as the wing portion of the intermediate molded product 25 (FIG. 6b). On the other hand, the guide groove in the guide roller 7 provided separately between the second stand 20 and the third stand 30 has the same shape as the wing portion of the second intermediate molded product 35 (FIG. 6C) (not shown). .

Further, as shown in FIG. 1 and FIG.
The protrusion 120 of the lower roll hole die 12 has the above-mentioned second stand 2
It is the same as the radius of curvature (4 mm) of the protrusion 220 of the second lower roll hole die 22 at 0.

Further, as shown in FIG. 1, the height H of the protrusion 120 of the first lower roll hole die 12 is equal to that of the horizontal portion 122 of the first lower roll hole die 12 and the first upper roll hole die 12. 1
1 of the longest distance L from the top of the molding recess 110
5%. In addition, as shown in FIG.
0 is the second lower roll hole die 22 having the protrusion 220.
And a second upper roll die 21 that forms a mountain-shaped forming part together with the second lower roll die.

Further, as shown in FIG. 3, the third stand 3
No. 0, the third upper roll die 31 has an outer forming surface 310 having the same shape as the outside of the angle, which is the final formed product, and the third lower roll die 32 has an inner forming having the same shape as the inside of the angle. It has a face 320. Others are the same as the conventional one.

Next, a process of manufacturing an angle using a round material in the manufacturing apparatus 1 will be described mainly with reference to FIG. First, the round material 15 is charged from the upstream side of the first stand 10 (FIGS. 1 and 5), and the first rolling pass is performed in the first stand 10.

At this time, as shown in FIG. 6b, the round material 15 (FIG. 6a) has a portion 253 corresponding to the apex angle portion 453 of the angle 45 by the first upper roll hole die 11.
A chevron shape is formed in the center groove 2 at the position corresponding to the inner corner apex 450 of the angle 45 by the first lower roll die 12.
50 is formed. That is, the round material 15 is an intermediate molded product 25 having a mountain shape on the upper surface, the central groove 250 on the lower surface, and wing portions at both ends.

Next, as shown in FIGS. 4 and 5, the intermediate molded product 25 has a first stand 10 and a second stand 20.
It is fed into the second stand 20 and is rolled while being restrained by the guide roller 7 installed between and.
That is, the intermediate molded product 25 is closer to the shape of the angle 45 (FIG. 6d) to be obtained by the second upper roll hole mold 21 and the second lower roll hole mold 22 (FIG. 2) in the second stand 20. Rolled into a second intermediate molded product 35 (Fig. 6c).

Next, as shown in FIGS. 4 and 5, the second intermediate molded product has a second stand 20 and a third stand 30.
It is fed to the third stand while being restrained by the guide roller 7 installed between Then, in the third stand 30, the second intermediate molded product 35 is
The upper roll die 31 and the third lower roll die 32 (FIG. 3) are used to form the angle 45 (FIG. 6d) to be obtained.

Next, the function and effect of this example will be described. In the angle manufacturing method of this example, the center groove 250 is formed on the round material 15 during the first rolling pass.
To provide. Therefore, when rolling on the second stand 20, a centering force is generated so that the leading end of the protrusion 220 of the second lower roll die 22 enters the center groove 250. Therefore, in the second stand 20, the centering of the intermediate molded product 25 in the width direction can be easily performed.

The intermediate molded product 25 rolled by the first stand 10 has the wing portions at both ends thereof constrained by the guide rollers 7. Therefore, even if high pressure is applied to the first stand 10, the intermediate molded product 2
In the case of No. 5, left and right runout and twisting are suppressed, and are smoothly fed to the second stand 20. Therefore, in the second stand 20, a stable rolled state can be obtained.

Further, in this example, the second stand 20
The guide roller 7 is also provided between the second stand 30 and the third stand 30. Therefore, the runout of the second intermediate molded product 35,
The occurrence of twist is suppressed, and the rolling condition of the third stand is
Stabilize. Therefore, the angle 45 with good dimensional accuracy
It can be obtained with only three rolling passes.

Further, in the manufacturing apparatus 1 of this example, the first upper roll hole die 11 has a forming recess having the above angle. Therefore, in the first stand, centering of the round material in the width direction can be easily performed, and a mountain shape can be easily provided on the upper surface of the intermediate molded product 25. In addition, the first lower roll hole type 12
Has the protrusion 120. Therefore, the intermediate molded product 2
The center groove 250 can be easily provided on the lower surface of the substrate 5.

The guide groove 7 is provided in the guide roller 7. Therefore, the guide roller 7
Can constrain the intermediate molded product 25 and the second intermediate molded product 35 not only in the horizontal direction but also in the vertical direction. Therefore, the runout and the twist of the intermediate molded product 25 and the second intermediate molded product 35 can be surely suppressed.

Therefore, in this example, an angle with high dimensional accuracy can be obtained by the above-mentioned excellent centering effect and realization of a stable rolling state. Therefore, by changing the size of the round material and adjusting the gap between the upper roll hole type and the lower roll hole type in each stand, it is possible to stably manufacture angles of various types.

Next, in the manufacturing apparatus 1 of this example, as shown in FIG.
As shown in a to d, a manufacturing process of an angle 45 (FIG. 6d) in which a width W1 of one side is 15 mm and a thickness T1 is 3 mm using a round material 15 having a diameter of 16 mmφ is shown. The round material 15 is rolled into the intermediate molded product 25 in the first stand 10, the second intermediate molded product 35 in the second stand 20, and the final product angle 45 in the third stand.

Further, FIGS. 7A to 7D show a manufacturing process of an angle 47 (FIG. 7D) having a width W2 of 10 mm on one side and a thickness T2 of 2 mm using a round material 17 having a diameter of 10 mm. The round blank 17 is rolled into the intermediate molded product 27 in the first stand 10, the second intermediate molded product 37 in the second stand 20, and the angle 47 of the final product in the third stand.

Although the two types of angles 45 and 47 are manufactured by using the same roll hole type of the manufacturing apparatus 1, as shown in FIGS. 6 and 7, desired size and shape can be obtained respectively. It was In the manufacturing apparatus 1 of this example,
A small angle having a width of 10 mm to 20 mm and a thickness of 2 mm to 3 mm can be manufactured without changing the roll hole die.

As described above, in this embodiment, it is possible to stably manufacture angles of various sizes by using one type of roll hole type.

Embodiment 2 This embodiment shows a so-called butterfly type embodiment. In this example, instead of the first to third stands used in the first embodiment, as shown in FIGS. 8 to 12, five stands composed of a pair of upper and lower roll hole types, that is, first to fifth stands. 51-55 were used. Further, instead of the guide roller 7 in Example 1, a guide roller 8 having a plurality of types of guide grooves as shown in FIG. 15 was used and installed between the stands.

As shown in FIG. 8, the first upper roll hole die 511 of the first stand 51 has a forming recess 513 having an angle D of 100 degrees. Further, as shown in FIG. 8, the first lower roll hole die 512 in the first stand 51 has a protrusion 514 for forming the central groove and the protrusion 514.
Has horizontal portions 515 on both sides.

Further, as shown in FIG. 8 and FIG.
The protrusion 514 of the lower roll hole die 512 is 1.3 times the radius of curvature of the protrusion 524 of the second lower roll hole die 522 in the second stand 52. That is, the second lower roll hole mold 52
While the radius of curvature of the second protrusion 524 is 3 mm,
The radius of curvature of the protrusion 514 of the first lower roll hole die 512 is 4 m.
m.

Further, the height H (FIG. 8) of the protrusion 514 of the first lower roll hole mold 512 is the same as that of the roll horizontal surface 515 and the first upper roll hole mold 5 of the first lower roll hole mold 512.
11 is 14% of the longest distance L between the apex of the molding recess 513 and the apex.

In the second stand, since it is a butterfly type, unlike the first embodiment, both the upper roll hole die 521 and the lower roll hole die 522 each have a horizontal portion 5.
26,525. Further, as shown in FIG. 10, the third stand 53 includes a third upper roll hole die 531 and a third lower roll hole die 532 each having a mountain-shaped forming portion.

Further, the fourth stand 54 has a fourth upper roll hole die 541 and a fourth lower roll hole die 542 each having a mountain-shaped forming portion which is closer to the shape of the angle which is the final formed product than the third stand. It consists of Further, as shown in FIG. 12, the fifth stand 55 has a fifth upper roll hole die 551 having an outer molding surface 5510 having the same shape as the outer shape of the angle, which is the final molded product, and the same shape as the inner shape of the angle. And a fifth lower roll hole die 552 having an inner forming surface 5520 of the above.

Further, as shown in FIG. 15, the guide roller 8 has first to fifth guide grooves 81 to 85 having five different sizes, that is, different widths and depths. The guide roller 8 has a shaft hole 86 for inserting a roll shaft (not shown) inside and a bearing space 87 for fixing a bearing (not shown), as shown in FIG. are doing. The guide roller 8 is configured so that the interval between the pair of left and right guide rollers 8 can be arbitrarily changed and set, and is arranged so as to be able to move up and down with respect to the pass line (see reference numeral 99 in FIG. 5).
Others are the same as in the first embodiment.

Next, a specific example of manufacturing the angle in the manufacturing apparatus of this example will be described. In this example, FIG. 13 and FIG.
As shown in Fig. 13, a round material 60 with a diameter of 16 mmφ (Fig. 13
Using a), the width W3 of one side is 15 mm and the thickness T3 is 3
An angle 65 (Fig. 14c) with a size of mm was produced.

That is, the round material 60 is applied to the intermediate molded product 61 in the first stand 51 (FIG. 8) and to the second stand 51 (FIG. 8).
In the stand 52, the second intermediate molded product 62,
The third intermediate molded product 63 is sequentially rolled by the stand 53. Similarly, the fourth stand 54 is rolled into the fourth intermediate molded product 64, and the fifth stand (FIG. 12) is rolled into the final product angle 65.

As a result, the cross-sectional shape of the material to be rolled in each process, that is, each of the above-mentioned intermediate molded products 61 to 64 and the angle 65, was substantially symmetrical and good, as shown in FIGS.

Further, in this example, the guide roller 8 having a plurality of types of guide grooves 81 to 85 is used. Therefore, the optimum guide groove can be selected by shifting the guide roller in the vertical direction according to the size of the angle to be manufactured. Therefore, the intermediate molded products 61 to 64 can be reliably restrained.

In addition, the same effect as that of the first embodiment can be obtained. Also in this example, an angle having a width of 10 mm to 20 mm and a thickness of 2 mm to 3 mm can be manufactured without replacing the roll hole die.

[Brief description of drawings]

FIG. 1 is a first upper roll hole type and a first example in Example 1.
Explanatory drawing of a lower roll hole type.

FIG. 2 is a second upper roll hole type and a second type in Example 1.
Explanatory drawing of a lower roll hole type.

FIG. 3 shows a third upper roll hole type and a third type in Example 1.
Explanatory drawing of a lower roll hole type.

FIG. 4 is an explanatory diagram of a guide roller according to the first embodiment.

FIG. 5 is an explanatory diagram of the configuration of the manufacturing apparatus according to the first embodiment.

FIG. 6 is an explanatory diagram of a change in cross-sectional shape of a round material according to the first embodiment.

FIG. 7 is an explanatory diagram of a change in cross-sectional shape of a round material according to the first embodiment.

FIG. 8 is a first upper roll hole die and a first embodiment in Example 2;
Explanatory drawing of a lower roll hole type.

FIG. 9 is a second upper roll hole type and a second type in Example 2.
Explanatory drawing of a lower roll hole type.

FIG. 10 is an explanatory diagram of a third upper roll hole type and a third lower roll hole type in the second embodiment.

FIG. 11 is an explanatory view of a fourth upper roll hole type and a fourth lower roll hole type in the second embodiment.

FIG. 12 is an explanatory view of a fifth upper roll hole type and a fifth lower roll hole type in the second embodiment.

FIG. 13 is an explanatory view of a cross-sectional shape change of a round material in the second embodiment.

FIG. 14 is an explanatory view of a cross-sectional shape change of a round material according to the second embodiment.

FIG. 15 is an explanatory diagram of a guide roller according to the second embodiment.

FIG. 16 is a perspective view of an angle in a conventional example.

[Explanation of symbols]

 1. . . Manufacturing equipment, 10. . . First stand, 11. . . 1st upper roll hole type, 12. . . First lower roll hole type, 110. . . Molding recess, 120. . . Protrusion, 20. . . Second stand, 21. . . Second upper roll hole type, 22. . . Second lower roll hole type, 25. . . Intermediate molded product, 250. . . Central groove, 30. . . Third stand, 7. . . Guide rollers,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Shimizu 1 Wano Wari, Arao Town, Tokai City, Aichi Prefecture Aichi Steel Co., Ltd.

Claims (7)

[Claims] 1. A plurality of stands comprising a pair of an upper roll hole type and a lower roll hole type are used to perform a plurality of rolling passes,
In the method of manufacturing a mountain-shaped angle from a round material, the first round-shaped
An angle characterized by forming a chevron shape at a portion corresponding to the apex of the angle by the roll hole type, and forming a central groove at a position corresponding to the inside corner of the angle by the first lower roll type Manufacturing method. 2. The first stand and the second stand according to claim 1.
A method for manufacturing an angle, characterized in that the intermediate molded product is fed to the second stand while restraining the wing portions at both ends of the intermediate molded product molded by the first stand. 3. A plurality of stands using a pair of an upper roll hole type and a lower roll hole type as a pair, and a plurality of rolling passes,
In an apparatus for manufacturing a mountain-shaped angle from a round material, the first upper roll hole die in the first first stand is
The first lower roll hole die in the first stand has a forming concave portion with an angle of 90 to 120 degrees, and a protrusion for forming a central groove at a position corresponding to an inner corner apex of the angle with respect to the round material. And a horizontal portion on both sides of the protrusion, and between the first stand and the second stand, the wings of both ends of the intermediate molded product molded by the first stand are constrained. An angle manufacturing apparatus, characterized in that a pair of guide rollers having guide grooves for arranging are arranged. 4. The protrusion of the first lower roll hole type according to claim 3, wherein the radius of curvature of the protrusion of the second lower roll hole type in the second stand is 1 to 1.5 times. Angle manufacturing equipment. 5. The height of the projection of the first lower roll hole die is the horizontal portion of the first lower roll hole die and the forming of the first upper roll hole die according to claim 3 or 4. An angle manufacturing apparatus characterized in that it is 5 to 25% of the longest distance L from the top of the recess. 6. The method according to any one of claims 3 to 5,
The above-mentioned guide roller has a plurality of types of the above-mentioned guide grooves. 7. The method according to any one of claims 3 to 6,
The above-mentioned stands are provided in three units or more, and between the stands, a pair of guide rollers having guide grooves for guiding the wings at both ends of the intermediate molded product formed in the previous step are arranged. Angle manufacturing equipment characterized by