JPH1076320A - Method for bending stepped steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending method of a stepped steel sheet by which the stepped steel sheet is bent without making cut in the step part of the stepped steel sheet and without generating bending strain on the surface in a bent part of the stepped steel sheet. SOLUTION: An outside steel sheet 2 is bent while moving a pushing member 16 so as to squeeze the member from the clamped part 12a of the outside steel sheet 2 toward the free end 2b. In this way, the step part of the outside steel sheet 2 is bent while applying tensile force to the bending part 2a of the clamped part 12 of the outside steel sheet 2, so the bending strain to be generated in the bending part of the step part of the outside steel sheet 2 is forcedly dispersed in the direction of the free end 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bending a stepped steel plate, and more particularly to a method of bending a stepped steel plate of a heat insulating wall panel for a building.

[0002]

2. Description of the Related Art Insulated wall panels are known as building materials for construction. Insulated wall panels have an inner skin material (inner steel plate) and an outer skin material (outer steel plate) arranged at regular intervals, and a core material (insulation material) is packed between these inner steel plate and outer steel plate. It is.

When a wall of a building is formed by using the heat insulating wall panel, the connecting end of the outer steel plate of the heat insulating wall panel is bent substantially at a right angle, and the bent portion of the connecting end is used to make use of the bent portion of the heat insulating wall panel. And other heat insulation wall panels. In this way, a plurality of heat insulating wall panels are arranged and connected to form a heat insulating wall of a desired size.

[0004] A method of bending the connection end of the outer steel plate of the heat insulating wall panel at a substantially right angle will be described below. FIG. 3 (a),
(B) is an explanatory view of a conventional method for bending a stepped steel plate. In FIG. 3A, the heat insulating wall panel 1 is placed on the steel plate bending device 50, and the outer steel plate 2 is arranged on the swing part 51. Next, the outer steel plate 2 is clamped by the mounting table 52 and the pressing portion 53.

In this state, the swing part 51 is rotated counterclockwise (in the direction of the arrow) about the support shaft 54, and the result is shown in FIG. 3 (b). Further, by pivoting the swinging portion 51 in the counterclockwise direction about 90 ° about the support shaft 54, the connecting end 2c of the outer steel plate 2 is bent at a substantially right angle, and the result is shown in FIG. Show.

[0006]

FIG. 4 is a perspective view showing a state where a conventional stepped steel plate is bent. The outer steel plate 2 is bent at approximately 90 ° at the connection end 2 c, and generates a bending strain 6 on the surface and the corner of the bent portion of the step portion 5. This distortion 6
Is generated on the surface and corners of the heat insulating wall panel 1,
This will impair the appearance of the building.

As a method for solving this problem, a notch 8 is conventionally formed near the step 5 of the outer steel plate 2 with scissors (see FIG. 5), and the stress which causes the bending distortion 6 due to the presence of the notch 8 is suppressed. There is known a method of bending a stepped portion to be made (see FIG. 3).

FIG. 5 is a perspective view showing a bent state of a conventional stepped steel plate. As in FIG. 4, the outer steel plate 2 is bent at a substantially right angle at the connection end 2c. In the case of FIG. 5, the bending distortion at the time of bending can be released by the cut 8, so that the bending distortion 6 (see FIG. 5) is not generated on the surface of the bent portion and the corner of the step portion 5. However, since the cut 8 and its tip 8a appear on the surface of the heat insulating wall panel 1,
The appearance is remarkably deteriorated and the durability is lowered.

According to the present invention, a step 8 is formed in a step of a stepped steel plate.
A method for bending a stepped steel sheet which can bend the stepped steel sheet neatly without inserting a bent portion and without generating a bending distortion on a bent portion surface and a corner portion of the stepped steel plate. Is to be solved.

[0010]

According to a first aspect of the present invention, a stepped steel plate having a step portion is clamped substantially perpendicularly to the step portion, and the stepped steel plate is folded from the clamp portion. In the method of bending a stepped steel plate to be bent, a pressing member is brought into contact with a vicinity of a clamp portion of the stepped steel plate, and the stepped steel plate is bent while moving the pressing member toward the free end of the stepped steel plate. It is characterized by bending.

In the method for bending a stepped steel plate according to the first aspect, the stepped steel plate is bent while the pressing member is moved from the clamp portion of the stepped steel plate toward the free end. As a result, the step portion of the stepped steel plate can be bent while applying a tensile force to the clamp portion of the stepped steel plate (that is, the bent portion of the stepped steel plate). It is possible to forcibly disperse the bending distortion to be generated in the vicinity in the free end direction.

[0012] Thus, even if the conventional method of making a cut in the step portion of the stepped steel sheet to release the bending distortion before bending the stepped steel sheet to release the bending distortion is adopted, the bending distortion can be caused near the bent portion of the stepped steel sheet. The stepped steel plate can be bent neatly without causing the generation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Since the heat insulating wall panel is the same as that of the conventional art shown in FIGS. 3 to 5, the same reference numerals are given and the description is omitted. FIG. 1 is a perspective view of a stepped steel plate bending apparatus according to the present invention.

The stepped steel plate bending apparatus 10 includes an apparatus body 11 on which the heat insulating wall panel 1 is mounted, and a clamping means 12 for clamping the outer steel sheet (stepped steel sheet) 2 of the heat insulating wall panel 1.
A pressing member 16 that bends the outer steel plate 2 of the heat insulating wall panel 1, a pair of pressing cylinders 18, 18 connected to both ends of the pressing member 16 and arranged substantially horizontally, and a pair of pressing cylinders 18 at both ends of the pressing member 16. It comprises a pair of lift cylinders 25, 25 connected and arranged substantially vertically. Reference numeral 3 denotes an inner steel plate, and reference numeral 4 denotes a heat insulating material.

The clamping means 12 includes a lower clamping member 1.
3 and an upper clamp member 14, and the lower clamp member 13 is fixed to the apparatus main body 11. Further, the upper clamp member 14 is supported by the apparatus main body 11 via a lifting means (not shown) so as to be able to move up and down.

Therefore, by lowering the upper clamp member 14, the outer steel plate 2 of the heat insulating wall panel 1 can be clamped by the upper clamp member 14 and the lower clamp member 13. Conversely, a similar result can be obtained by fixing the upper clamp member 14 and moving the lower clamp member 13 up and down.

The pressing cylinder 18 is operated by pneumatic or hydraulic pressure. The distal end of a piston rod 19 is connected to both ends of the pressing member 16 via pins 20, and the end of a cylinder 21 is connected to the pins 22. It is connected to the apparatus main body 11 through the main body. By extending the piston rod 19 of the pressing cylinder 18, the pressing member 16 can be positioned at a desired position in the XX direction.

The lifting cylinder 25 is operated by pneumatic or hydraulic pressure.
The end of the cylinder 28 is connected to the apparatus main body 11 via a pin 29. Further, by extending the piston rod 26 of the lifting cylinder 25, the pressing member 16 can be raised and lowered in the YY direction.

The method for bending a stepped steel sheet according to the present invention will be described. First, FIGS. 2 (a), 2 (b) and 2 (c) are illustrations of a method for bending a stepped steel sheet according to the present invention. FIG. 2 (a)
, The heat insulating wall panel 1 is placed on the apparatus main body 11 of the steel sheet bending apparatus 10 and the outer steel sheet 2 is fixed to the lower clamp member 1.
3 and the upper clamp member 14. Then
The upper clamp member 14 is lowered, and the outer steel plate 2 is clamped by the upper and lower clamp members 13 and 14.

In this case, the piston rods 19, 19 of the pressing cylinders 18, 18 are extended by a predetermined amount, the pressing member 16 is moved in the direction of the arrow X, and the pressing corner is positioned at the position X1. In this state, the tip 16 a of the pressing member 16 is in contact with the outer steel plate 2.

In FIG. 2B, the lifting cylinder 25,
The piston rods 26, 26 of 25 are extended, and the pressing member 16 is raised in the arrow Y direction. Thereby, the pressing corner 16b of the pressing member 16 rises along the surface of the outer steel plate 2 so as to rub (stretch) from the bent portion 2a toward the free end 2b. Therefore, the connecting end 2c of the outer steel plate 2 is bent from the clamp portions 12a of the upper and lower clamp members 13, 14, thereby forming a bent portion 2a.

As described above, by moving the pressing corner portion 16b along the surface of the outer steel plate 2 so as to rub it from the bent portion 2a toward the free end 2b, the outer steel plate 2
A tensile force can be applied to the bent portion 2a. Therefore, the bending distortion to be generated in the bent portion 2a is caused by the outer steel plate 2
Are forcibly dispersed in the direction of the free end 2b.

In FIG. 2C, the lifting cylinder 25,
The piston rods 26 of the pressing cylinders 18 are further extended, and the piston rods 19 of the pressing cylinders 18 are further extended to press the pressing member 16 in the direction of arrow X. . Thereby, the connection end 2c of the outer steel plate 2 can be bent at a substantially right angle. The result will be described with reference to FIG.

As shown in FIG. 4, the outer steel plate 2 has the connecting end 2c bent at a substantially right angle. In the case of the bending method of the prior art, the bending strain 6 was generated on the surface and the corner of the bent portion of the step 5, but according to the method of bending a stepped steel plate according to the present invention, Bending distortion 6
It is possible to bend the connection end 2c without causing the occurrence of

That is, as described with reference to FIG.
The connecting end portion 2c of the outer steel plate 2 is raised at the pressing corner 16b along the surface of the outer steel plate 2 to apply a tensile force to the bent portion 2a of the outer steel plate 2. It is possible to forcibly disperse the bending distortion 6 as shown in FIG. 4 which is generated in the bent portion 2a in the direction of the free end 2b. Thus, as seen in FIG.
The connecting end 2c can be bent neatly without generating the bending distortion 6 on the surface of the heat insulating wall panel 1.

[0026]

According to the first aspect of the present invention, the stepped steel plate is bent while the pressing member is moved from the clamp portion of the stepped steel plate toward the free end. As a result, the step portion of the stepped steel plate can be bent while applying a tensile force to the clamp portion of the stepped steel plate (that is, the bent portion of the stepped steel plate). Can be forcibly dispersed in the free end direction.

Thus, before bending the stepped steel plate,
Even if the step of the stepped steel sheet is not cut as in the conventional method to release the bending distortion, the bending of the stepped part can be bent neatly without causing bending distortion at the bent part of the stepped part. It is possible (see FIG. 6).

[Brief description of the drawings]

FIG. 1 is a perspective view of a stepped steel sheet bending apparatus according to the present invention.

FIG. 2 is an explanatory view of a method for bending a stepped steel sheet according to the present invention.

FIG. 3 is an explanatory view of a conventional method for bending a stepped steel plate.

FIG. 4 is a perspective view showing a bent state of a conventional stepped steel plate.

FIG. 5 is a perspective view showing a bent state of a conventional stepped steel plate.

FIG. 6 is a perspective view showing a bent state of a stepped steel sheet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulated wall panel 2 ... Outer steel plate (stepped steel plate) 2a ... Bent part 2b ... Free end 2c ... Connection end part 3 ... Inner steel plate 4 ... Heat insulating material 5 ... Step part 6 ... Bending distortion 8 ... Cut 8a ... Cut Including a tip part 10 ... Bending device for stepped steel plate 11 ... A device body of a bending device for stepped steel plate 12 ... Clamp means 12a ... Clamp part 13 ... Lower clamp part member 14 ... Upper clamp part member 16 ... Pressing member 16a: Tip of pressing member 16b: Corner of pressing member 18: Pressing cylinder 19, 26 ... Piston rod 20, 22, 27, 29 ... Pin 21, 28 ... Cylinder 25: Lifting cylinder 50 ... Steel plate bending device 51: Steel plate bending Oscillating part 52 of the apparatus 52 Mounting table 53 Holding part 54 Support shaft

Claims (1)

[Claims] 1. A method for bending a stepped steel sheet, comprising: clamping a stepped steel sheet having a stepped portion substantially perpendicular to the stepped portion, and bending the stepped steel sheet from the clamped portion. A step of bending a stepped steel plate while abutting a pressing member in the vicinity of the clamp portion of (1) and moving the pressing member toward the free end of the stepped steel plate.