JPS60130B2 - Folding plate curving device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an apparatus for bending a corrugated folded plate.

Corrugated folded plates with a trapezoidal or U-shaped cross-section used for roofs, walls, ceilings, etc. are usually straight, but when used for the roof of a station platform, etc., the part that corresponds to the eaves is particularly For this reason, corrugated folding plates with a curved portion have been used. Unlike flat plates, corrugated folding plates are not easy to form into curves.

Therefore, various curving methods and curving devices have been proposed so far. In conventional bending equipment, it has been proposed to form an appropriate curved state by forming protrusions on the bottom of the corrugated folded plate and an appropriate number of conical protrusions on both sides or inclined surfaces using a press. .

That is, a curved shape is formed by drawing a portion of the folding plate. In the method of fixing the folding plate and forming protrusions while giving elongation to the folding plate in the mold part, if the elongation of the plate during drawing exceeds the allowable elongation rate, cracks may occur or scratches may occur on the surface of the plate. Adversely affects product quality. Furthermore, if the elongation rate during drawing varies, the curvature of the curved portion will vary in each part. Therefore, in order to form a folded plate having a curved portion with the correct curvature, it is necessary to form the protrusions under a substantially constant elongation within the allowable elongation rate range. Until now, an idea has been proposed to prevent the generation of irregular stagnation by using a press that has a lower mold and an upper mold that are rotatably supported in a fixed direction, but the elongation rate of the drawing part must be kept below the allowable elongation rate. Furthermore, favorable results were not obtained in terms of forming protrusions under uniform elongation.

An object of the present invention is to provide a folding plate curving device that solves the above-mentioned conventional problems. The details of the present invention will be explained with reference to embodiments shown in the figures. In FIG. 1, the folding plate bending device has a press device 1 and a folding plate clamping device 2.

The press device 1 has a lower mold 4 fixed to a table 3 and an upper mold 6 supported by a hydraulic cylinder 5 attached to the table 3.

As shown in FIG. 2, a folding plate 7 having a bottom portion 7a and a side surface 7b that is perpendicular or inclined to the bottom portion 7a is press-formed using the press device 1, and a protrusion 8 is formed on the bottom portion 7a.
A curved portion 10 is formed by forming a conical protrusion 9 on the side surface that becomes gradually narrower as it goes away from the bottom.

In the case of pressing into a pile, a flat plate 7' is pressed by a lower mold 4' and an upper mold 6', as shown in Fig. 3a, and a third
A protrusion 8' as shown in Figure b is formed.

In this case, the flat plate-like material 7' is drawn into the center from the left and right as shown by the arrows, centering on the point P where the upper mold 6' first contacts, and is formed into a shape along the upper mold 6'. Now figure 3b
Comparing the state before pressing, shown by the chain line, and the state after pressing, shown by the solid line, in the case where the plate does not elongate, assuming that the length of the part where the protrusions are formed by pressing is 2A, A point at a distance A from the initial center will move to an inflection point at a distance B from the center.
That is, the plate will be drawn into the center by a length C. If plate 7' is fixed, it will be stretched by length C for pressing. In press forming as shown in FIG. 2, the folding plate 7 is drawn in by a length Δ1 in order to form the protrusions 8 and 9 as shown in FIG. In order to prevent such elongation due to material being drawn in during pressing, the clamping device 2 has a receiver rotatably supported by a pin 13 fixed to a bracket 12 of a table 11, as shown in FIGS. 1 and 5. It has a stand 14. A long hole 16 is formed in the support plate 15 that supports the pedestal 14, and the pin 13 is inserted into the long hole 16. The elongated hole 16 is formed substantially parallel to the length direction of the folding plate 7 mounted on the pedestal 14. pin 13
It is also possible to provide the elongated hole 16 in the pedestal 14 and the pedestal 11.
A clamp lever 17 is pivotally attached to the pedestal 14 by a pin 18.

The folding plate 7 is clamped and held between a pedestal 14 and a clamp lever 17. The holder 14 has a holder frame 1 for positioning the folding plate 7.
It is convenient to provide 9. It is convenient if the clamp lever 17 is provided with a grip bar 20 to facilitate opening and closing operations. When clamping, one end of the clamp lever 17 is locked to the pedestal 14. As the locking means, any means can be used, such as a structure in which, by turning the lock lever 21, a biased wheel presses a part of the clamp lever 17 against the pedestal 14 and locks it. A spring 22 is attached to either the clamp lever 17 or the pedestal 14, and when clamping, a spring 22 is applied to the clamp lever 17 on both sides of the folding plate 7, and the folding occurs due to the action of play, etc. at the pivot point of the pin 18. It is also possible to prevent the clamping force against the plate 7 from being uneven.

Springs 23 and 24 are provided between the pedestal 14 and the pedestal 11 on both sides of the fulcrum formed by the pin 13, and normally support the pedestal 14 in a substantially horizontally balanced state.

Further, a tuft 26 is provided between the base 11 and the pedestal 14 so as to pull the pedestal 14 in a direction opposite to the direction of movement of the pedestal 14 due to retraction during pressing.

With such a structure, the clamping device 2 has a pedestal 14.
can move linearly along the notch 16 and rotate around the pin 13 in response to external force applied to the folding plate 7.

By selecting the force of the return imitation 25 to be a force sufficient to pull back the pedestal 14 and the folding plate 7 when no external force is applied to the folding plate, and a minimum force, the pulling force is applied to the folding plate 7 during pressing. When activated, the folding plate 7 can be moved together with the pedestal 14 towards the press device 1, and can be moved with almost no elongation occurring in the folding plate 7. When the external force is removed, the pedestal 14 is returned to its original position together with the folding plate 7 by the force of the original copy 25.

If the length of the notch 16 is set to a minimum length corresponding to the amount of retraction produced by one press, it is possible to avoid giving unnecessary resistance to the folding plate 7 during retraction. In this case, when the press is finished, the state between the table 11 and the pedestal 14 is as shown in FIG. 6. According to the present invention, the clamp and pedestal that fix the folding plate during the bending process by pressing the folding plate can be moved laterally in accordance with the retraction during the pressing, and the clamp and the pedestal that fix the folding plate can be moved laterally in response to the retraction during the pressing, so that the clamp and the pedestal that fix the folding plate can be moved laterally in response to the retraction during the pressing. By applying tension to the folded plate, it was possible to avoid elongation, and it was possible to eliminate the occurrence of partial cracks in the folded plate and scratches on the surface.

In addition, there was no variation in elongation, and there was no variation in curvature of the curved portion.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a bending device according to the present invention, Fig. 2 is a perspective view showing an example of a folded plate subjected to a bending process, and Fig. 3 is an explanatory diagram of press working, and a shows the mold and plate before pressing. FIG. 4 is a diagram illustrating the state of retraction during bending of the folding plate. FIG. 5 is a front view of the material clamping device according to the present invention. FIG. 6 is a schematic front view showing the moving state of the clamp device after press working. 1... Press device, 2... Clamp device, 11
...stand, 13...pin, 14...cradle, 16...
...Elongated hole, 17... Clamping means. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A press device having a lower die and an upper die for forming protrusions on a folding plate, and a clamping device for clamping the folding plate, and by sequentially forming a plurality of protrusions, a curved portion can be formed. In a folding plate curving device for forming a folding plate, the clamping device has a pedestal having a clamping means for clamping the folding plate, and a pedestal supporting the pedestal so as to be movable substantially parallel to the direction of movement of the folding plate during pressing. A folding plate curving processing device characterized by the following. 2. Folding plate curving according to claim 1, characterized in that a spring is installed between the cradle and the pedestal to pull the pedestal in a direction opposite to the direction in which the folding plate moves during pressing. Processing equipment. 3. A patent claim characterized in that a supporting member having a pin on one side of the pedestal and the elongated hole on the other side is provided, and the pedestal is supported so as to be movable laterally with respect to the pedestal by engagement of the pin and the elongated hole. The folding plate curving device according to item 1 or 2.