JPH0360802A - Manufacture of angle steel - Google Patents

Abstract

PURPOSE:To manufacture an angle steel whose external angle part is almost right angled by forming a projecting part with heating the bent part of a flat metal sheet and forming a right angled external angle part on the projecting part thereof by an angle shaped caliber die. CONSTITUTION:A bent necessary part 10E of a metal flat sheet, i.e., the part to be made in a right angled shape is heated as a 1st stage first. A projecting part 10 is then formed on the heating part by pressing the metal flat sheet from both sides thereof. An intermedium member 1A whose part equivalent to the external angle part in an angle becomes thicker than other parts is then obtained at this stage. At a 2nd stage, then, an external angle part in almost right angled shape is formed at the external angle part by using the caliber die having a desired angle shape. Consequently an angle steel 1 whose external angle part 101 is almost right-angled can be manufactured with good productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing angle members used for the frames of steel-framed buildings.

[Prior Art] Conventionally, two main methods are known as methods for manufacturing angle materials. The first method is a forming method in which an angle material is manufactured by bending approximately the center of a long thin metal plate using rolls.

The second method is to hot-work a thick billet into a predetermined shape using rolling rolls to produce an angle material.

In recent years, as the demand for L-shaped angle members made of stainless steel, for example, has increased as a decorative material for construction materials and other buildings, there has been a demand for products that are inexpensive and have excellent decorative properties.

(Problem to be solved) However, the above conventional method for manufacturing angle materials has 1
There are the following problems.

That is, the former forming method described above is shown in FIGS. 15 and 1.
As shown in FIG. 6, this is a method in which a flat metal plate 91 is directly formed by rolling rolls 8.

The rolling roll 8 consists of a roll 80 having a right-angled square groove 801 and a roll 81 having a right-angled convex portion 811, and rolls a metal flat plate 91 at right angles between the two. However, in this method, as shown in FIG.
Only the angle material 9 with a rounded 0 can be obtained. Also,
This method is.

Since the austenitic stainless steel 1, such as 5US304, is rolled and formed into a predetermined shape, the deformability is relatively small and the deformation resistance is high. In addition, the stainless steel is susceptible to seizure, resulting in surface flaws on the product, and is subject to a lot of wear from rolling rolls. Further, the circumferential speed of the rolling roll varies depending on the location, and this causes the surface of the angle material 9 to become rough.

Moreover, as shown in Fig. 18, the angle material 9 made by the above-mentioned forming method has rounded outer corner portions 90, and when used for the right-angled corners of buildings, such as handrails, pillars, etc. edges (corners) cannot be obtained, and the decorativeness is impaired.

Note that @ surface 94 is attached to adjacent plate material 97.9 by welding 96.
It is sometimes combined with 8. Further, a groove surface for weld build-up is formed on the end surface 94.

On the other hand, as shown in FIG. 19, the end face of the angle member 9 is
A rounded tip 95 (dashed line) is likely to form.

Therefore, it is necessary to cut the rounded end portion 95 of the angle material 9 into planar end surfaces 94, 94 before shipping. Therefore, a large amount of manpower is required, productivity is poor, and costs are high.

The present invention has been made in view of such conventional problems, and the outer corner portions are approximately right angles. The purpose of this invention is to provide a method for manufacturing angle materials with high productivity.

[Problems to be Solved] The present invention provides a method for manufacturing an angle material in which the outer corner portion where one side and the other side of the angle material abut are substantially perpendicular, and the method comprises: heating the metal plate, then pressing the metal plate from both sides of the metal plate,
A method for manufacturing an angle material, comprising forming a protrusion in the heated portion, and then molding the intermediate member using a hole mold having a desired angle shape to produce an angle material having a substantially right-angled outer shape. It is in.

In the present invention, the above-mentioned outer corner portion refers to the outer portion of the angle material where the ■ side and the other side are in contact, that is, the portion forming the apex angle of the angle material (Fig. 4, Fig. 7, (See Figure 9).

Further, the above-mentioned flat metal plate includes, for example, a steel material such as a long thin flat steel plate, a thick billet, or a bloom, which is rolled into a flat plate shape. In addition to the flat steel plates mentioned above, there are flat plates made of various metals such as titanium flat plates.

Further, in the heating, while the flat metal plate is being conveyed, a portion desired to be bent, which is approximately the central portion thereof, is heated using, for example, a high frequency heating device. Also 4 for heating.

This includes not only hot working but also various forms of heating such as warm working or heating followed by cooling to an annealing state, that is, a composition capable of plastic deformation.

Further, the pressing is performed from both sides of the flat metal plate using, for example, pressing rolls.

The above-mentioned protrusion includes a curved protrusion, a V-shaped protrusion, and the like. This protrusion can be formed on both sides (Fig. 2) or on one side (Fig. 2) of the flat metal plate.
11).

In addition, the above-mentioned intermediate member refers to an intermediate formed material in which a protrusion is formed on one or both sides of the above-mentioned flat metal plate (see Fig. 2).
Such an intermediate member is formed using a groove mold, that is, a roll having a curved groove, a V-groove, or the like.

Further, it is preferable that the angle material is first processed into a rounded shape with both ends protruding outward, and then formed into an intermediate member having a bulged portion and a curved end portion. Thereby, it is possible to manufacture an angle member whose end face is flat (see Examples).

Note that after the hot working is completed, it is preferable to perform heat treatment for stress relief, etc., if necessary.

[Action and effect]

In the manufacturing method according to the present invention, the first step is to heat a portion of a flat metal plate that is desired to be bent, that is, a portion that is to be made into a right-angled shape. Next, the flat metal plate is pressed from both sides of the flat metal plate to form a protrusion in the heated portion.

Therefore, at this stage, an intermediate member is obtained in which the portion corresponding to the outer corner portion of the angle is thicker than the other portions.

Next, in the second step, a substantially right-angled outer corner portion is formed at the outer corner portion using a hole mold having a desired angle shape.

Therefore, according to one aspect of the present invention, it is possible to manufacture an angle member whose outer corner portions are substantially right angles with high productivity.

[Example] (First Example) A method for manufacturing an angle material according to this example will be explained using FIGS. 1 to 9.

In other words, in the five examples, as shown in FIG. 9, the outer corner portion 101 where one side ll and the other side 12 of the angle member ID come into contact exhibits a substantially right angle, and the end surfaces of each of the sides 11 and 12 16 is a method for manufacturing a flat angle material ID.

In the above manufacturing, first, a flat steel (metal flat plate) made of 5US304 is processed by a groove processing machine 2A having a pair of upper and lower rolling rolls 20.21 as shown in No. ttg.
A first intermediate member IA as shown in FIG. 2 is acidified. The groove processing machine 2A includes an upper roll 20 having a curved surface 1f420t in the center, and a lower roll 21 having a curved groove 201 in the center.

Further, the groove processing machine 2A has end face pressing rolls 31 and 32 on the WI side. Then, the end face pressing roll 3
1.32 each have a U-shaped Wt310320 in the center. Further, in front of the upper roll 20 and the lower roll 21, a high frequency heating coil 4 is arranged to heat a desired portion of the flat steel to be bent.

Further, the upper roll 20 has a rotating shaft 22 at its core. 'Also. The lower roll 21 has a rotating shaft 23 at its core.
has. Both rotating shafts 22 and 23 are connected to a drive device (not shown) so as to rotate while being adjusted so that no difference in surface circumferential speed occurs.

Here, as a first step, as shown in FIG. 1, while heating the desired bending portion 10 of the flat steel as a raw material with the high-frequency heating coil 4, the flat steel is rolled between the upper and lower rolls 20.
1. Press with pressure rolls 31 and 32 on both sides. As a result, as shown in FIG. 2, substantially spherical protrusions 10 are formed on both sides of the flat steel. The first intermediate member IA is continuously formed.

That is, the curved groove 201 of the lower roll 21 forms the curved portion 103 on the back surface. Furthermore, curved portions 104 are also formed on the fourth surface by the curved grooves 201 of the upper roll 20.

Further, the end face 14 of this first intermediate member is formed into an arc shape by the pressure rolls 31, 32.

Moreover, since the first intermediate member IA is continuously formed in a long length, it is sent as it is to the next forming step.

Next, the first intermediate member 1A, as shown in FIG.
A second intermediate member I as shown in FIG.
B is converted into acid form.

The forming machine 2B has a V-shaped groove 240 in the center.
and a V-shaped protrusion 250 in the center.
and a lower roll 25 having a.

Further, the upper roll 24 has a rotating shaft 241 at its axial center, and the lower roll 25 has a rotation #251 at its axial center. The two rotating shafts 241 and 251 are connected to a drive device so as to rotate while being adjusted so that a difference in surface circumferential speed between the two does not occur.

For the acid form, the above forming machine 2
B is rotated, the first intermediate member IA is bent at a right angle at the protruding portion 10 thereof, and the second intermediate member IB is bent.
The bottom shape is continuously formed (Fig. 4), and this bottom shape is performed by warm working. In addition, when work hardening occurs in the first intermediate member 1A.

In order to remove this work hardening, heat treatment is performed prior to the forming process.

Further, the first intermediate member 1A is connected to the V of the upper roll 24.
The outer corner portion 1 of the protrusion 10 is formed by the groove 240.
01 is pressed so that it is at right angles 9 both sides 11.12
is formed. In this way, L as shown in FIG.
A shaped second intermediate member 1B is formed.

Further, in the second intermediate member IB, both side portions 11.
The end face 14.14 of 12 projects outward and has a rounded shape. Both end surfaces 14.degree. 14 are bottom-shaped into a third intermediate member IC having bulging portions 150, 150 and tip curved portions 151, 151 by 5-edge machining in the first and third stages.

In the third stage, as shown in FIG.
An edge processing machine 2C is used, which includes a central rolling roll 26 having a diameter of 0 and an edge rolling roll 27 having edge forming hole molds 272 and 273 in the center.

That is, as shown in FIG. 5, the outer corner portion 101 of the third intermediate member 1 is supported by the groove 260 of the central rolling roll 26, while each end portion 15.15 is formed by the edge forming hole mold 272. Edge rolling is performed by 273.

While the outer corner portion 101 is pressed by the V-groove 260, both end portions 15.15 are pressed by the edge forming hole mold 27.
2 and 273 form the bottom shape of the tip curved portion 151 and the bulged portion 150. This is because, as shown in FIG. 6, the edge-shaped bore holes 272 and 273 have curved bottom surfaces and rounded side walls.

As shown in FIG. 7, the edge processing machine 2C produces a third intermediate member 1C having a bulging portion 150 and a tip curved portion 151 at each end 15.15.

Next, as a fourth step, an end face finishing process is performed.

In this fourth stage, as shown in FIG. 8, a grooved rolling roll 28 having a V-groove 280 in the center.

A finishing machine 2D consisting of a protrusion-equipped rolling roll 29 having a V-shaped protrusion 290 in the center is used.

That is, in this finishing process, as shown in the 8th TA, the outer corner portion 101 is supported by the grooved rolling roll 28, and one both ends 15.15 are finished flat by the protruding rolling roll 29.

That is, while the outer corner portion 101 is pressed by a grooved rolling roll having a V-groove 280 in the center, the two end portions 15.
The above-mentioned bulges 150 and 150 of 15 are grooved rolling rolls 2
8 and the protruded rolling roll 29 from above and below.

As a result, the tip curved portions 151, 151 protrude outward to form a planar end surface 16. Further, the bulging portions 150 and 150 (FIG. 7) are connected to the tip #1 curved portion 15.
As it moves to 1151, both sides become flat.

That is, the angle material 1D is as shown in FIG.

- External corner portion 101 where side portion 11 and other side portion 12 abut
presents an approximately right angle. Moreover, the end faces 16, 16 of each of the sides of the angle member ID have a flat surface.

Next, the effect of one example will be explained.

In this example, as a first step, a first intermediate member 1A having spherical protrusions 10 on both sides is formed while adding flat steel, and then the protrusions 10 are bent at right angles, so that the angle There is less internal stress in the material, and hole-shaped machining I! 2A is used to form the protrusion 10 in advance at the desired bending portion 10E by hot working, so that the outer corner portion of the obtained angle material can be made into a right-angled shape.

In addition, a spherical protrusion 10 formed at the center of both sides of the first
Since it is formed in stages, the outer corner portion 101 tends to have a substantially right-angled shape. The reason for this is that since the desired bending portion 10E is thick due to the protruding portion 10, the outer corner portion is likely to protrude at right angles by forming, and roundness is not produced.

In addition, as the second step, forming is adopted in which the protruding portion 10 of the first intermediate member IA is bent at right angles to form the second intermediate member 1B, so a forming method using warm working or cold working is possible. Become. Therefore, internal stress is less likely to be generated in the angle member, and it is easier to form the angle member at a substantially right angle to the outer corner portion 101 than in the conventional forming method.

Further, as a third step, the above-mentioned right-angled second intermediate member IB
The end faces of both sides of the bulging portion 150 and the tip curved portion 15
Since the edge machining process that forms the bottom of 1 is adopted, the end faces of both sides of 1 can be finished flat in the next finishing process with good productivity.

That is, first, an edge processing machine 2C as shown in FIG. 5 and a finishing machine 2D as shown in FIG. The portion 151 can be finished flat.

Therefore, according to the five examples, an angle member in which the outer corner portion 101 is a substantially right angle and both end surfaces 16 are flat can be manufactured with high productivity.

(Second Example) The manufacturing method according to this example will be explained using FIG. 10 and FIG. 11.

That is, the manufacturing method of this example is 5.In place of the groove processing machine 2A in the first embodiment, an upper roll 20 with a smooth surface is used.
2 is used. The other configurations were the same as those of the first embodiment.

According to one example, the two hole processing machines described above,
In the first intermediate member 1E, it is possible to form a desired bending portion 10E having two smooth surfaces and a protruding portion 10 consisting of a hemispherical curved portion 105 only on the back surface.

Therefore, the first intermediate member E is formed into a desired angle shape by pressing and bending both end portions 11 and 12 in the direction G using the forming machine 2B of the first embodiment so that the protruding portion 10 becomes the outer corner portion H. form. and,
After that, the angle material is made into an angle material by the same process as in the first embodiment.

According to this example, it is possible to implement a method for manufacturing an angle material having the same effects as in the first example.

(Third Example) The manufacturing method according to this example will be explained using FIGS. 12 to 14.

That is, the two examples are the angle material IG in the first example above.
The shape of both end faces is changed. Other configurations are
This is the same as in the first embodiment.

In this example, as shown in FIG. 12, a tapered surface 161 is formed at one corner of the end surface 16 of the angle member 1. That is, the tapered surface 161 is formed by a rolling roll (path shown) having a taper approximately the same shape as the tapered surface 161.

Further, as shown in FIGS. 13 and 14, a tapered surface 162 162 is formed on the periphery of the planar end surface 16.
Alternatively, it is also possible to manufacture the angle material 1 having curved tapered surfaces 163, 163.

That is, 7 the above-mentioned lever surfaces 162, 162 and the curved tapered surface 1
63.163 is formed by a rolling roll (path shown) having a taper of approximately the same shape as this.

This is to form a groove surface for build-up during welding.

[Brief explanation of drawings]

1 to 9 show a first embodiment, FIG. 1 is a front view showing a state in which a first intermediate member is formed by a hole processing machine, FIG. 2 is a perspective view of the first intermediate member, and FIG. FIG. 3 is a front view showing a state in which the second intermediate member is formed by the forming machine;
FIG. 4 is a perspective view of the second intermediate member, FIG. 5 is a front view showing the state in which the third intermediate member is formed by the edge processing machine, and FIG.
The figure is a sectional view of the end of the edge rolling roll, Figure 7 is a perspective view of the third intermediate member, Figure 8 is a front view showing the third intermediate member being finished by the finishing machine, and Figure 9 is the angle material. , and FIGS. 10 and 11 show the second embodiment, and FIG. 10 is a front view showing the state in which the first intermediate member is formed by the groove processing machine. FIG. Perspective view, 1st
Figures 2 to 14 are plan views showing the end faces of the angle members;
51m to 19 show conventional examples, FIGS. 15 to 17 are explanatory views of their manufacture, and FIGS. 18 and 19 are explanatory views of the use of conventional angle members. 1, ID, , Angle members IA, IE, , First intermediate member IB, , Second intermediate member tC, , Third intermediate member 10, , Projection portion 101, , External corner portion. 103 104.105. ,, curved portion 11.12. ,,edge 14.16. ,, end face 15019. Swollen portion 151, . . . tip curved portion. ') Only 101 Figure 3 Figure 4 Figure 7 Figure 5 Figure 8 Figure 10 Figure 11 Figure 12 Figure 15

Claims (1)

[Claims] A method for manufacturing an angle material in which the outer corner portion where one side and the other side of the angle material contact each other forms a substantially right angle, the method comprising: heating a portion of a flat metal plate where bending is desired; Pressing the flat metal plate from both sides of the metal plate to form a protrusion in the heated portion, and then molding the intermediate member using a hole mold having a desired angle shape to form an angle having a substantially right-angled outer shape. A method for manufacturing angle materials, characterized by manufacturing angle materials.