JPS5973125A - Rolling and bending method of shape material - Google Patents

Abstract

PURPOSE:To bend a thin-walled shape material to an optional radius of curvature without buckling the same by rolling the material to a grade shape wherein the wall thickness decreases gradually from one end toward the other end thereby bending naturally the material. CONSTITUTION:A flange part 15a which is one side of, for example, an angle 15, is sandwiched between the roll 11 and a roll 12 having an inclined axial center of a bending installation 10. The flange part 15a is rolled by such rolls 11, 12 to a grade shape wherein the wall thickness decreases gradually from one end in the transverse direction, i.e. the end on a web 15b side toward the other end. The angle 15 is thus bent to an arc shape with the thick walled end faced inward, whereby a product 16 having an annular flange 16a united to one body on the outside of an annular web 16b is obtd.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method of rolling and bending a section, and in particular a method suitable for bending a thin section to a very small radius of curvature without buckling it. Concerning rolling and bending methods for shaped materials.

[Prior art]

Conventionally, bending of sections has been carried out using a tension bending method or an angle bender.

In the tension bending method, as shown in Fig. 1, both ends of the material 1, which is a section, are gripped with chucks 4.4, and the material 1 is wrapped around a mold 3 with tension applied in advance, and then the material 1 is bent. However, when bending with a small radius of curvature is performed using this method, it is necessary to apply a large tension in order to prevent the material from buckling. However, when the tension is increased, the material is required to elongate significantly, and the outer edge of the bend may exceed the limit of elongation and break, or the cross-sectional shape may shrink or fall as the entire material elongates. However, there was a drawback that the required bending process could not be performed.

Note that in FIG. 1, reference numeral 2 indicates a bent product.

On the other hand, as shown in Figures 2 and 3 of the angle bender Fi, the winding is performed by a roll 5, a bending roll 6, and a deformation restraint roll 7.
, using a crank jig 8 and a base 9. Then, one end of the material l, which is a profile, is gripped with a clamp jig 8, and the material is wrapped around the roll 5 through the base 9.
The material 1 is rotated to apply tension to the material 1, and at the same time, a bending roll 6 applies a bending moment, and in order to suppress changes in the cross-sectional shape, bending is performed while being restrained by a deformation restraint roll 7. However, since buckling is likely to occur on the inner diameter side of bending, there is a drawback that thin materials cannot be bent.

In addition, in any of the above bending methods, it is necessary to prepare a roll, etc. for the winding that acts as a mold or a mold according to the radius of curvature, and when processing non-mass produced products, the mold or winding is rolled. There was also a drawback that the cost was high.

In addition, in FIGS. 2 and 3, the reference numeral 2 indicates a bent product.

In the case of small-diameter or thin-walled materials that cannot be processed by the above bending method, the material is divided into small pieces and bent into arc shapes, and then
The only options were to weld them together into a circular shape, or to use hot processing methods such as the so-called laborious process of making fires, which required an extremely large number of man-hours.

[Purpose of the invention]

It is an object of the present invention to eliminate the drawbacks of the prior art described above, to be able to bend various thin-walled shapes without buckling or reducing the cross-sectional shape, and to bend different shapes and windings for different radii of curvature. The object of the present invention is to provide a method for rolling and bending a shaped material, which can easily bend a shape to an arbitrary radius of curvature without using rolls or the like.

[Summary of the invention]

In the present invention, at least one side of one section is sandwiched between rolls, and this one side is rolled in a gradient shape in which the wall thickness gradually decreases from one end in the width direction to the other end, and the entire section is rolled as described above. It is characterized by the fact that it is bent into an arc with the thicker end side in the width direction of one side facing inward, and with this configuration, all of the above objectives can be achieved. be.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

4 to 8 show a first embodiment of the present invention.

In this first embodiment, as shown in FIG. 4, an angle 5 consisting of a flange portion 5a and a web portion 15b of the same size is used as the material of the profile, and the flange portion 1
It is bent into a circular shape with 5a facing outward.

In addition, the bending equipment 10 includes a first
roll 11 and a second roll installed on one end side above the roll 11.
The second roll 12 is provided with a roll 12 whose axial center is inclined, and has a sloping rolling gap between the first roll 11 and the second roll 12.

Then, the first bending equipment 10 of the bending equipment 10. second roll 1
1 and 12, sandwich the flange portion 15a, which is one side of the angle 15, between the first. The second rolls 11 and 12 roll the sifting flange portion 15& in a gradient shape in which the wall thickness gradually decreases from one end in the width direction, which is the end on the web portion 15b side, to the other end. , 1st + 2nd (D
The rolls 11 and 12 are rotated to feed the angle 15 in one direction.

As a result, the angle J5 is bent into an arc shape with the thick end of the flange portion 15a in the width direction inside.

In addition, by rolling the material in a gradient shape in which the thickness gradually decreases from one end in the width direction to the other end, the material bends in an arc shape with the thicker end inside. has already been demonstrated by the present inventors.

Further, the radius of curvature R when bending the material is determined by the bending ratio of the material.

Here, the rolling reduction Pu is expressed as follows, where tl is the thickness of the material before rolling, and t2 is the thickness after rolling.

In this first embodiment, by rolling the flange portion 15a of the angle 15 having the dimensions shown in FIG. 6 and as shown in FIG. 7CB), the rolling reduction Pu is distributed.
The entire angle 15 can be bent into a circular shape with a radius of curvature R shown in FIG. 7(4). In addition, web part 15
As shown in Fig. 7 (←), the rolling reduction ratio Pu is assumed to be zero.

A product 16 processed in this manner is shown in FIG.

The product 16 shown in FIG. 8 has a ring-shaped web 16b.
A ring-shaped flange 16a is integrally formed on the outside of the ring, and the whole is a ring with an outside flange.

Next, FIGS. 9 to 13 show a second embodiment of the present invention.

In this second embodiment, the materials include:
An angle 17 consisting of a flange portion 17a and a web portion 17b slightly shorter than the flange portion 17a is used, and is bent into a circular shape with the flange portion 17a facing inside.

As shown in Fig. 1O, the bending equipment 1O is
roll 11 and a second roll installed on one end side above the roll 11.
A third roll 13 is provided on one side of the first roll 11. The axis of the second roll 12 is inclined, and the axis of the second roll 12 is inclined. A gradient rolling gap is formed between the second rolls 11 and 12, and the third roll 13 is installed parallel to the first roll 11. An even rolling gap is formed between the third rolls 11 and 13 in the vertical direction.

Then, the first bending equipment 10 of the bending equipment 10. second roll 1
1 and 12, insert the flange portion 17a of the angle 17 between them. The web portion 17b of the angle 17 is inserted between the third rolls 11 and 13, and the web portion 17b of the angle 17 is inserted between the third rolls 11 and 13. Between the second rolls 11 and 12, the flange portion 17a is rolled in a gradient shape in which the thickness gradually decreases from one end in the width direction to the other end, which is the end on the web portion 17b side. Third
The web portion 17b is rolled to an even thickness between the rolls 11 and 13 of the first roll. The second and third rolls 11, 1.2, and 13 are rotated to feed the angle 17 in one direction.

As a result, the angle 17 is bent into an arc shape with the thick end of the flange portion 17a inside, and is eventually bent into a circular shape.

Based on this second embodiment, the flange portion 17a of the angle 17 having the dimensions shown in FIG. 11 is shown in FIG.
As shown in FIG. 12(C), the web portion 17b of
The entire product can be bent into a circular shape with a radius of curvature approximately as shown in FIG. 12(A)K, and FIG. 13 shows the product 18.

The product 18 shown in FIG. 13 has a ring-shaped web 18
A ring-shaped flange 18a is integrally attached to the inside of b, and the ring as a whole has a hollow flange inside.

Next, FIGS. 14 to 18 show a third embodiment of the present invention.

In this third embodiment, a so-called 2-shaped cross-section material 19 (hereinafter referred to as Z-shaped material) is used as the material. As shown in FIG. The third embodiment has second web portions 19a, 19b and a flange portion 19c connecting them.
The second web portions 19a and 19b are bent into a cylindrical shape, and are also bent into a cylindrical shape arranged in two stages on the same center and connected by a ring-shaped flange.

In addition, the bending equipment 10 has a first
roll 11, and a third roll 1 from one end above the roll 11.
3, and a third roll 13 installed on one side of the first roll 1. The axis of the second roll 12 is inclined, and a gradient rolling gap is formed between the iv-th rolls 11 and 12, and the third roll 13 is parallel to the first roll 11. The first thing that has been installed.
The third roll 11.13fi has a rolling gap parallel to the U vertical direction.

Thus, the first part of the bending equipment 10. second roll 1
1. Insert the flange part 196 f of the Z-shaped member 19 between the first and second parts. Z-shaped material 1 is placed between the third rolls 11 and 13.
9 second web portion 19b and the first. Between the second rolls 11 and 12, the flange portion 19c as one side of the two-shaped web portion 19 is moved from one end thereof, which is the first web portion 19a side, to the second web portion, which is the other end. 19
Rolling in a gradient shape that gradually decreases the wall thickness toward the end on the b side,
1st. The second web portion 19b is rolled to a uniform thickness between the third rolls 11 and 13, and the second web portion 19b is rolled to a uniform thickness between the third rolls 11 and 13. The second rolls 11, 12, and 13 are rotated to feed the second mold 19 in one direction.

As a result, the Z-shaped member 19 is bent into an arc shape with the thick end of the flange portion 19c inside, and is then bent into a circular shape.

Based on this third embodiment, a flange portion 19e of two shapes 19 with dimensions as shown in FIG. 16 is constructed as shown in FIG. 17(B).
As shown in FIG. 17(C), the rolling reduction Pu has a distribution, and the second web portion 19b of the Z-shaped member 19 is rolled with the rolling reduction Pu uniformly distributed as shown in FIG. 17(C). The entire Z-shaped member 19 can be bent into a circular shape with a radius of curvature R shown in FIG. 17 (N), and the product side is shown in FIG. 18.

On the product side shown in FIG. 18, a small-diameter, cylindrical first web 20a and a large-diameter, cylindrical second web 20b are arranged in two stages on the same center line, and a ring-shaped flange 20
It is machined into a cylindrical shape joined by e.

Furthermore, FIGS. 19 to n show a fourth embodiment of the present invention.

In this fourth embodiment, the materials are as shown in FIG. Second flange portions 21m, 21b (!
A channel 21 having a web portion 21a connecting these is used, and the core channel 21 is bent into a bobbin shape with the first and second flange portions 21g and 21b facing outward.

The bending equipment 10 includes a first roll 11 and a second roll installed above the other end, as shown in the additional figure.
roll 12 and the other lower end side of the first roll 11,
In other words, it includes a fourth roll 14 installed below and facing the second roll J2.

The axis of the second roll 12 is inclined, and the second roll 12 has an inclined axis.
．． A gradient rolling gap is formed between the second rolls 11 and 12, and the outer peripheral surface of the fourth roll 14 is tapered. Between the fourth rolls 11 and 14 is the first roll. A sloped rolling gap is formed which is symmetrical to the rolling gap formed between the second rolls 11 and 12.

The first part of the bending equipment IO. Second roll 11°12
The first flange portion 21a of the channel 21 is inserted between the first flange portion 21a and the first flange portion 21a of the channel 21. The second flange portion 21b of the channel 21 is inserted between the fourth rolls 11 and 14, and the first flange portion 21b corresponding to the two sides of the channel 21 is inserted between the fourth rolls 11 and 14. Second flange portion 21a
. Second and fourth rolls 11
, 12, and 14, and send channel 2] in one direction.

As a result, channel 21 becomes the first channel. Thick web portion 21e of the 20th flange portion 21a, 21b
It is bent into an arc shape with the side inward, and is finally bent into a circular shape.

Based on the fourth embodiment described above, the first . second flange portion 21a,
21b as shown in FIGS. 22(B) and (C),
By rolling with a distribution in the rolling reduction Pu, the entire channel 21 can be bent into a circular shape with a radius of curvature R shown in FIG. 22(A). In addition, the web part 21
As shown in FIG. n (D), e is a rolling reduction ratio Pu of zero. In this way, the song describes the processed product 22 as
As shown in the figure.

Product n shown in Fig. n is a ring-shaped first. The second flanges 22a and 22b are on the outside, and these are connected in a bobbin shape by a cylindrical web portion 22e.

Proceeding to Figures 1 to 4, a fifth embodiment of the present invention is shown.

In this fifth embodiment, the materials are as shown in Fig. 19 and Fig. 19.

□ As can be seen from the figure, the same channel 21 as in the fourth embodiment is used, and the first... Second flange portion 21a
, 21b is placed inside and bent into a cylindrical shape.

In addition, the bending equipment 10 includes a first
a second roll 12 installed above one end of the roll 11, a third roll 13 installed on one side of the first roll 11, and the first roll 11. A fourth roll 14 is provided at one end of the lower end of the roller. The second roll 12 is installed with its axis r9 inclined, and the second roll 12 is installed with its axis r9 inclined. A gradient rolling gap is formed between the second rolls 11 and 12, and the first roll. Third roll 11
, 13 are formed with equal rolling clearances in the vertical direction, and the fourth roll 14 has a tapered outer peripheral surface. Between the fourth roll 11 and 1.4 is the first roll. A sloped rolling gap is formed which is symmetrical to the rolling gap formed between the second rolls 11 and 12.

Thus, the first part of the bending equipment 10. second roll 1
1 and 12, the first flange portion 21a of the channel 21 is inserted between the first flange portion 21a and the first flange portion 21a. A web portion 21c is inserted between the third rolls 11 and 13, and the web portion 21c is inserted between the third rolls 11 and 13. Fourth roll 11
, 14, a second flange 21b is inserted between the first flange 21b, which corresponds to two sides of the channel 21. Second flange portion 21
& , 21b at the same time, from one end to the web portion 21c
The web portion 21Q is rolled in a gradient shape in which the thickness gradually decreases toward the other end of the side, and the web portion 21Q is rolled to a uniform thickness. M2. Third. 40th roll 11 , 12 ,
13 and 14 are rotated to feed the channel 21 in one direction.

This allows the channel 21 to be connected to the thicker first channel opposite the web portion 21C. second flange portion 2JJ,
It is successively bent into an arc shape with the end portion of 21b inside, and then bent into a circular shape.

Based on the fifth embodiment, the first . Second flange part 21m
, 21b is rolled with a distribution of the rolling reduction Pu as shown in FIGS.
The entire channel 21 can be curved into a circular shape with a radius of curvature R as shown in FIG.

The product 23 shown in FIG. 28 has a ring-shaped first ring. The second flange portions 23a and 23b are placed on the inside, and these are bent into a shape connected by a cylindrical web portion 23e.

In each of the above-mentioned examples, by appropriately setting the length of the material and arbitrarily setting the rolling reduction Pu in accordance with this,
Special molds or wraps can be made without using rolls, etc.
Products with various curvature radii R can be obtained, and even thin-walled shapes can be bent easily.

Furthermore, in each of the examples, the principle is that by rolling the material in a gradient shape from one end in the width direction to the other end, the material naturally curves into an arc shape with the thicker end side inward. Since the bending process is performed using
Problems such as material buckling and post-processing deformation caused by applying excessive force can be prevented, and high-quality products can be obtained.

〔Effect of the invention〕

According to the invention as described above, by rolling the material in a gradient shape in which the thickness gradually decreases from one end to the other end in the width direction, the thicker end side is naturally used as the inner side 1. Since the bending process is applied to the shape using the principle of bending, it is possible to easily bend even thin-walled shapes without causing problems such as buckling or shape changes. Moreover, by adjusting the rolling reduction rate, bending can be performed to any radius of curvature, so it is possible to create a mold according to the required radius of curvature.However, winding that acts as a mold will make the rolls etc. uncomfortable and will significantly increase equipment costs. This has the effect of saving money, and it also has the effect of making it possible to obtain products with extremely small diameters.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the prior art, and FIGS. 2 and 3 are a front view and a plan view showing other examples of the prior art. 4 to 8 show a first embodiment of the present invention,
Figure 4 is a perspective view showing the shape of the material, Figure 5 is a diagram showing processing equipment and its operating state, Figure 6 is an enlarged sectional view of the material, and Figure 7 is a diagram showing the processing state of the material. The figure shown in FIG. 8 is a perspective view showing the product. 9 to 13 show a second embodiment of the present invention, in which FIG. 9 is a perspective view showing the shape of the cutting bar, FIG. 10 is a diagram showing the bending equipment and its operating state, Fig. 11 is an enlarged cross-sectional view of the material, Fig. 12 is a drawing showing the processing state of Aiwa, and Fig. 13 is a 9゛ (main view) showing the product. This shows the third embodiment of the invention, in which Fig. 14 is a perspective view showing the shape of the material, Fig. 15 is a drawing showing the bending equipment and its working state, and Fig. 16 is an enlarged view of the dimensions of the material. 17 is a cross-sectional view showing the processed state of the material, and FIG. 18 is a perspective view showing the product. FIGS. 19 to 23 show a fourth embodiment of the present invention. Figure 19 is a perspective view showing the shape of the material, Figure 20 is a diagram showing the processing equipment and its operating state, Figure 21 is an enlarged cross-sectional view of the material with larger dimensions, and Figure 22 is a diagram showing the processing state of the material. The figure shown in FIG. Figure 25 is a diagram showing the processing equipment and its operating state, Figure 2 is an enlarged sectional view of the size of the suspension, Figure 27 is a diagram showing the processing state of the material, and Figure 28 is a perspective view of the product. Pu...Reduction rate for the shape material, R...Radius of curvature, 10...Curves are processing equipment, 11, 12, 13,
14...The first part constituting the bending equipment. Second. Third.
4th roll, 15, 17... Angle as a profile, 19... Z profile as a profile, 21... Channel/channel as a profile, 16, 18° 20.23... ·product. Representative Patent Attorney Tadashi Akimoto Fig. 1 Fig. 2 Fig. 3 Fig. 4 Houki Fig. 5 Fig. 20 Fig. 21 (C) (D) 弗 23 Fig. 2 Gu; 24th item 25th Garden

Claims (1)

[Claims] At least one side of the profile is sandwiched between rolls, and this one side is rolled in a gradient shape in which the wall thickness gradually decreases from one end in the width direction to the other end (75), and the entire profile is rolled in the above step 1. A method of rolling and bending a shape material, which is characterized by bending the material into an arc shape with the thicker end side in the width direction of the side facing inward.