JPS6024226A - Plane bending method of long-sized belt-like article - Google Patents

Abstract

PURPOSE:To maintain the plane bending part of a long-sized belt-like article at prescribed curvature irrespectively of the position thereof with easy tooling in plane bending of said article by pressing and compressing successively the prescribed bending part with the pressing length divided into a plurality from the length of said part, an adequate pressing width and compression rate. CONSTITUTION:The bending part of a long-sized blet-like article is successively pressed with the pressing length (a) divided into a plurality from the length (c) of said part, an adequate pressing width (b) and compression rate delta. The width (b) is 30-50% of the plate width and contributes most to the curvature. The compression rate delta contributes roughly linearly to the curvature and said rate delta must be within thickness limit of the belt-like article. The relation between the (a), (b), delta and the curvature is graphically depicted after a preliminary test for convenience. This method is practised with the extremely simple tooling which involves pressing of only the punch to the article irrespectively of the position and pitch of the bending part and is therefore simple.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an in-plane bending method for long strip products, and in particular, a method for bending long strip products without causing out-of-plane bending and at low cost. The present invention relates to an in-plane bending method for a long strip product suitable for imparting in-plane bending.

[Background of the invention]

Prior to explaining the prior art, the shape of a long strip to which the present invention is directed and the difference between in-plane bending and out-of-plane bending will be explained using drawings.

FIG. 1 is a perspective view showing a long strip-like product to which the present invention is applied, FIG. 2 is a perspective view showing an in-plane bending state of the long strip-like product according to FIG. 1, and FIG. FIG. 2 is a perspective view showing an out-of-plane rolling state of the elongated belt-like product shown in FIG. 1;

As shown in FIG. 1, the long strip-shaped product 1 refers to a long plate material whose plate thickness is relatively thin compared to the plate width W (for example, h/w<1/2) and whose length is t.

In-plane bending means bending the long strip 1 in the width direction, as shown in FIG. 2, and out-of-plane bending means bending the long strip 1 in the width direction as shown in FIG. It is to bend in the direction.

Conventionally known methods for bending plate materials include a three-point bending method, a tensile bending method, and a rolling bending method.

Figures 4 to 6 are for explaining the principle of the conventional bending method for plate materials. Figure 4 is a front view for explaining the three-point bending method, and Figure 5 is a diagram for explaining the tension bending method. FIG. 6 is a front view of the barrel to be explained, and a sectional view of the barrel to explain the rolling and bending method.

The three-point bending method shown in FIG. 4 is a method in which a bending force is applied to the central part of a plate supported by two bending fulcrums 3 using a bending punch 2 to impart a bend, but this method is not applicable to the present invention. When applied to a long strip-like product 1 such as a strip, there are problems such as out-of-plane bending or irregular deformation due to buckling when bent in the width direction of the strip.

The tensile bending method according to FIG.
In this method, a long strip-shaped article 1 is pressed against a groove 4a of a bending die 4 and bent. In this method, a groove 4a is provided in the bending die 4, and the long strip 1 is inserted into the groove 4a for processing. This prevents irregular deformation due to out-of-plane bending or buckling. Although it can be suppressed, special equipment is required.

Further, since the long strip-shaped article 1 is held by the chuck 5, there are other problems such as difficulty in imparting meandering in-plane bends at small pitches.

The rolling and bending method according to FIG. 6 is such that the rotation axes of two rolls 6 are arranged at a relative inclination, and by rolling the long strip-shaped product 1 with both rolls 6, the side with the larger thickness This is a method of applying in-plane bending with 1a on the inside of the bend and the smaller side 1b on the outside. This method requires the preparation of specialized equipment different from conventional rolling mills, so there is a problem in that when the production volume of the product is small, the equipment cost increases as a percentage of the production cost.

[Purpose of the invention]

The present invention eliminates the drawbacks of the prior art described in -F and uses an existing press to impart in-plane bending to a long strip at low cost and without causing out-of-plane bending. It is an object of the present invention to provide a method for in-plane bending of a long strip-shaped article.

[Summary of the invention]

The structure of the in-plane bending method for a long strip-shaped article according to the present invention is such that a predetermined length range of the widthwise end of the long strip-shaped article is repeated from one end of the predetermined length range to the other end. By applying pressure, the elongated strip-shaped article is bent so that the width direction end portion is bent outward.

Before entering into the explanation of the embodiments, the basic matters related to the present invention will be explained as follows.
This will be explained using FIGS. 7 to 9.

7 to 9 are for explaining the basic matters related to the present invention5, FIG. 7 is a perspective view showing a long strip-shaped product,
FIG. 8 is a perspective view of a main part for explaining the pressurizing procedure for the long strip according to FIG. 7, and FIG. 9 is a perspective view showing the long strip with 11 in-plane bends. It is.

In FIG. 7, 1 is a long strip product with a plate thickness, a plate width W, and a length t. Assume that an in-plane curve with a radius of curvature R (that is, a curvature of 1/R) imparts a curve as shown in FIG. In this case, the width direction end 7 (length C
), a pressurized length a obtained by dividing the length C into a plurality of pieces according to the size of the radius of curvature R of the in-plane bend to be applied, and a pressurized width in the width direction determined from this pressurized length a, By repeatedly applying pressure in the direction of the arrow (FIG. 8) with the amount of compression δ in the plate thickness direction and causing the material at the widthwise end 7 to flow in the longitudinal direction, the widthwise end 7 is moved to the outside of the bend. By imparting an in-plane curvature such that This is to obtain a strip-shaped product IA.

At this time, the factors that control the size of the radius of curvature R are:
The pressurizing length a in the longitudinal direction, the pressurizing width in the width direction, and the compression amount in the thickness direction δ (7a in Fig. 8 is
There is a first pressurizing section), which will be explained in detail in the description of the embodiment. In addition, since the elongate strip IA that has been given an in-plane bend by this in-plane bending method has a cross-sectional reduction at the widthwise end portion 7, the in-plane bending method for an elongate strip according to the present invention is as follows: The cross-sectional shape in the width direction does not matter much (for example, there is no problem in terms of strength).

Suitable for in-plane bending of objects (where appearance is not an issue).

[Embodiments of the invention]

The present invention will now be explained by way of an example shown in FIG. 9, in which a long strip product IA that has been given in-plane bending is processed.

FIG. 10 is a perspective view showing a mold used for performing an in-plane bending method for a long strip according to an embodiment of the present invention, and a long strip that is processed using the mold; The figure is a perspective view of the main part showing the first pressurizing state in in-plane bending according to Fig. 10, and Fig. 12 is the second pressurizing part next to the first pressing part according to Fig. 11. FIG. 3 is a perspective view of a main part showing a pressurized state.

In FIG. 10, 8 is a square punch related to a mold (upper mold) attached to a ram (not shown) of a press, and the dimensions of the pressing surface of this square punch 8 are a and Xl).

It is. Reference numeral 9 denotes an upper anvil for the mold placed on the bed (not shown) of the press, and the dimensions of this upper anvil 9 are a.
, Xl). and the square punch 8. Lower anvil 9
are attached to the press so that their central axes on the pressurizing surfaces coincide. Reference numeral 1 denotes a long belt-shaped product to which manibulators (not shown) for conveyance and pressurization position setting are attached at the front and rear in the longitudinal direction.

First, the manipulator places the long strip 1 at a predetermined position on the upper anvil 9, lowers the ram (not shown) of the press, and uses the square punch 8 to press the entire pressurized length C to a predetermined length. Pressure length a (=ap) in the longitudinal direction obtained by dividing into a plurality of pieces, and pressurization width b (<bP) in the width direction determined from this pressurization length a.
, the pressurizing portion 7a of the long strip 1 is pressurized for the first time by a compression amount δ in the plate thickness direction (a specific example will be described later) (FIG. 11).

Next, the manipulator moves the long strip 1 to the left on the lower plate number 9 by a distance a, and as before, press length a in the longitudinal direction, press width in the width direction, and press the width in the thickness direction. With the compression amount δ,
Pressurize the second pressurization section next to the first pressurization section 7a (
Figure 12). By repeating the above pressurization 5 times, the pressurization of the total pressurized length c (-5xa) is completed, and the long piece is given the desired in-plane curve as shown in FIG. A strip IA is obtained.

L showing a specific example in this example Specific example 1 Vl' according to FIG. 7 = 100 mm, h = 30rryn
When an in-plane bend with a radius of curvature R = 1000 (that is, a curvature 1/R = 10 x 10'''41/y) is given to the central part c = 500 of a long aluminum strip 1 with t = 2000 mm. .

The dimensions of the pressure surface of the square punch 8 are a = 100rrrm
.

bp=150mms Dimensions of lower anvil 9 are aa=200tr
an, ba = 300 mm. The dimensions of the pressurizing surface that is pressurized at one time are the pressurizing length in the longitudinal direction a = a p =
The compression width b in the width direction of the 100 mm 9 was set to 40 mm, and the compression amount δ in the plate thickness direction was set to 7.5 mm. This pressurization was performed five times in sequence, and the total pressurized length C=500 mm was pressurized. As a result, it was possible to impart an arcuate in-plane bend (straight lines on both sides) with a radius of curvature R of approximately 1000 m to the central portion 500 of the long strip-shaped product 1.

Specific example 2 According to FIG. 7, W=100, h=30, 1=2000
The center part (9) of a long aluminum strip 1 of mm (9) c = 500 + tm is pressurized at one time, with the pressing area, that is, the pressing length a = 100 m, and the pressing width b - 40 / area constant, When pressure was applied while changing the compression amount δ, the relationship between the compression amount δ and the curvature 1/R of the in-plane bending varied as shown in FIG.

FIG. 13 shows an example of the relationship between the amount of compression in the thickness direction and the curvature of the in-plane bending when applying pressure to the widthwise end of the plate surface of a long strip to impart in-plane bending. It is a compression amount-curvature characteristic diagram. As is clear from FIG. 13, the curvature of the in-plane bend increases almost linearly as the compression amount δ increases.

Specific example 3 W=100trvn, h=30rm, according to FIG.
Pressure length a=io to pressurize central part c=500 pharynx of long aluminum strip 1 with L=2000 fins at one time.

When the fin was pressurized by changing the compression width while keeping the compression amount δ = 6 a constant, the curvature of the in-plane bending was 1 when the compression width was changed.
The relationship with /R is as shown in FIG.

(10) Figure 14 shows the relationship between the pressurized width in the width direction and the curvature of the in-plane bend when the widthwise end of the plate surface of a long strip product is pressurized to give an in-plane bend. FIG. 3 is a pressure width-curvature characteristic diagram showing an example. As is clear from FIG. 14, as the pressing width increases, the curvature of the in-plane bending also increases. The curvature increases significantly in the range of 30 to 50 degrees of pressure width, and the degree of -F increase becomes slower when the width of pressure exceeds 50 degrees or more, that is, exceeds 1/2 of the plate width W.

In this way, the radius of curvature R of in-plane bending, (=1/curvature)
The size of the plate can be controlled by changing the amount of compression in the thickness direction (69) that is pressed at one time, the pressing width (s) in the width direction, and the pressing length (a) in the length direction.

In the above example, in-plane bending was imparted to only 101 parts of the long strip-shaped product, but by also applying pressure to the width direction end portion on the opposite side to the one that was pressurized in the above example, the above-mentioned surface could be bent. Continuing with the in-plane bend, an in-plane bend opposite to the in-plane bend can be applied by processing a long belt-like product with a meandering shape as shown in FIG. 2 (11). In this case, the surface to be pressurized may be either the front or the back.

Furthermore, in the embodiment, a square punch 8 is used as the mold.
．． I used the lower anvil 9, but the shape of the mold.

The dimensions are not limited, and for example, a corner punch may be used.

In addition, in the above embodiment, plate thickness h/plate width W=30/
Although an example of processing a long strip-shaped product 1 of 0.33 out of 100 has been described, the present invention is also applicable to cases where h/W is even smaller or larger (for example, 1).

According to the embodiment described above, it is possible to easily impart in-plane bending to the long strip-shaped product 1 using an existing press without using special equipment, using an inexpensive mold, and without causing out-of-plane bending. can.

〔Effect of the invention〕

As explained in detail above, according to the present invention, by using an existing press, it is possible to impart in-plane bending to a long strip-shaped product at low cost and without causing out-of-plane curling. It is possible to provide a method for in-plane bending of a long strip (12).

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a long strip-like product to which the present invention is applied, FIG. 2 is a perspective view showing an in-plane bending state of the long strip-like product according to FIG. 1, and FIG. FIG. 1 is a perspective view showing the state of a long strip bent out of plane, and FIGS. A front view for explaining the method, FIG.
FIG. 6 is a front view for explaining the tension bending method, FIG. 6 is a cross-sectional view for explaining the rolling bending method, and FIGS. 7 to 9 are for explaining the basic matters related to the present invention. , FIG. 7 is a perspective view showing a long strip-shaped product, FIG. 8 is a perspective view of a main part for explaining the processing procedure of the long strip-shaped product according to FIG. 7, and FIG. 9 is a perspective view showing an in-plane curved product. FIG. 10, which is a perspective view showing a long strip-shaped article provided with a ridge, shows a mold used for carrying out an in-plane bending method for a long strip-shaped article according to an embodiment of the present invention, and a mold for performing processing using the die. 11 is a perspective view also showing the long strip-shaped product
The figure shows the first (1
3) A perspective view of the main parts showing the pressurized state, FIG. 12 is a perspective view of the main parts showing the pressurized state of the second pressurizing part next to the first pressurizing part according to FIG. 11, and FIG. , the amount of compression showing an example of the relationship between the amount of compression in the thickness direction and the curvature of the in-plane curve when applying pressure to the widthwise end of the plate surface of a long strip product to impart in-plane bending. - Curvature characteristic diagram, Fig. 14 shows the relationship between the pressurized width in the width direction and the curvature of the in-plane bend when applying pressure to the widthwise end of the plate surface of a long strip-shaped product to impart an in-plane bend. FIG. 3 is a pressure width-curvature characteristic diagram showing an example of the relationship. 1... Long strip-shaped product, IA... Long strip-shaped product provided with in-plane bending, IC... Plate surface, 7... End portion in the width direction,
8... Square punch, 9... Upper anvil, a... Pressing length in the longitudinal direction, b... Pressing width in the width direction, C... Total pressing length, δ... Plate Thickness r'''IoIE!L Ro-＊＊＊i
, ,,. Agent Patent attorney Kosaku Fukuda ゛□ (1 other person) ゛ (14) Kaya 1 Tsurikaya 2 Calculation: 3 eyes Kaya 4 - Enclosure! $F No. Otsu Figure 141- Kaya 13 Intraocular pressure Auto; is I J (4%) Kaya! 4th otozθ 3θ 4ρ 5θ 6θ Pressure width

Claims (1)

[Claims] 1. The predetermined length range of the widthwise end of the long strip-shaped product is determined by the amount,
A surface of the elongated strip-shaped article, characterized in that the elongated strip-shaped article is given a bend with the width direction end bent outward by repeatedly applying pressure from one end side to the other end side of the predetermined length range. Inward bending method.