JP2943942B2 - Auxiliary device for bending cooling device - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention uniformly cools a particularly bent portion of a work when bending a work, particularly a composite steel plate such as a damping steel plate. The present invention relates to an auxiliary device for a folding cooling device.

2. Description of the Related Art Conventionally, when a work, particularly a composite steel plate such as a vibration damping steel plate, is bent by a bending machine, a bending portion of the work is cooled by a bending cooling device.

(Problems to be Solved by the Invention) However, as shown in FIG. 4, the cooling surface C of the bending cooling device has a portion where the work material W uniformly contacts.
W _A and a portion W _B that is not in uniform contact actually exist. Therefore, even if the cooling surface C is cooled uniformly, if the work W is in non-uniform contact, naturally, the entire bent portion of the work W is not efficiently and uniformly cooled.

If the work W is not cooled uniformly, the work W, particularly a composite steel plate such as a vibration damping steel plate, cannot be bent with high accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above problem by uniformly contacting a work with a cooling surface of a cooling device for bending and performing uniform and efficient cooling to obtain a bent product with good precision. And an auxiliary device for the bending cooling device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a method in which a work placed on a bending cooling device for cooling the work is provided by:
An auxiliary device for the bending cooling device was provided with a work holding device for pressing from above during cooling, provided in the bending cooling device.

(Operation) By employing the auxiliary device of the bending cooling device of the present invention, the work is placed on the cooling surface of the bending cooling device, and the work is pressed from above by the work holding device. Cooled uniformly and efficiently. However, a bent product with high accuracy can be obtained by bending with a bending machine.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, an outline of a machine for bending a workpiece, particularly a composite steel plate such as a damping steel plate, will be described for reference.

Referring to FIG. 3, since the specific configuration of the bending machine 1 such as a press brake is already known, the description will focus on the bending mold. That is, on the lower table 3 of the bending machine 1, the third
In the figure, a die 7 is mounted extending in a direction perpendicular to the paper surface. The tip of the die 7 is provided with, for example, a V-shaped bending groove 9. Moreover, the angle of the bending groove 9 and theta _D.

An upper table (not shown) is provided above the lower table 7, and a punch 13 is provided below the upper table via a plurality of punch holders 11 with substantially the same length as the die 7. . The tip of the punch 13 is provided with a punch cutting edge 15 protruding in, for example, a V-shape. The angle of the punch blade 15 and theta _P.

With the above configuration, for example, a damping steel plate W as a composite steel plate is placed on the bending groove 9 of the die 7 in a cooled state, and one of the lower table 3 and the upper table is moved up and down, thereby bending the die 7. By the cooperation of the machining groove 9 and the punch edge 15 of the punch 13, for example, a bending process is performed on a vibration damping steel plate W as a work.

Here, when a normal steel plate is bent at a right angle, for example, the angle θ _P of the punch edge 15 and the angle θ of the bending groove 9 are set.
_D is set to θ _P = θ _D ≦ 90 ° and bending is performed to obtain a highly accurate bent product. However, in a state where a damping steel sheet W as a composite steel sheet is cooled, for example, a right angle is formed. When bending, the angle θ _P of the punch edge 15 and the bending groove 9
Of the angle θ _D of the above condition (θ _P = θ _D ≦ 90 °)
In this case, a spring go phenomenon (a phenomenon in which the bending angle is reduced after bending due to the opposite phenomenon of springback) occurs, and a highly accurate bent product cannot be obtained. Therefore, in the case of right-angle bending, θ _P = θ _D >
By setting the angle to 90 °, when the phenomenon of spring go occurs, the bending angle of the damping steel sheet W can be set to 90 °, and the bending can be performed with high accuracy.

When bending the damping steel sheet W as the composite steel sheet,
Since the viscoelastic resin exists between the steel sheet and the steel sheet, if the bending is simply performed, a seagull phenomenon occurs. Therefore, it is necessary to cool the damping steel sheet W before performing the bending. .

The bending cooling device 17 for cooling the damping steel plate W is provided with a cooling body 19, as shown in FIG. 2, for example, and the cooling body 19 is a rectangular casing having an open upper part. Consists of Inside the cooling body 19, a thick heat insulating material 21 is stretched.

The opening 23 covered with the heat insulating material 21 has the cooling body 19
U-shaped cooling block extending in the same direction as the longitudinal direction
The cooling block 25 is supplied with, for example, liquid nitrogen 27 as a cooling medium from a supply pipe 29 joined to the cooling body 19 from a cooling gas cylinder (not shown). Further, the cooling block 25 is provided with small holes for venting gas, and both sides are covered with lids.
A cooling plate 31 is provided above the cooling block 25. The upper surface of the cooling plate 31 becomes the cooling surface 33.

According to the above configuration, a bent portion of, for example, a damping steel plate W as a composite steel plate to be bent is placed on the cooling surface 33 of the cooling plate 31, and liquid nitrogen is supplied from a cooling gas cylinder (not shown) through the supply pipe 29 to the cooling block. Once built in 25, gradually evaporate from small holes, and insulate except cooling surface 33,
Since the cooling is kept, the cooling block 25 can be efficiently cooled.

Also, the cooling surface 33 is enlarged compared to the conventional one, and the cooling gas does not directly hit the bent portion of the damping steel sheet W,
Since the cooling is performed through the cooling surface 33 of the cooling plate 31 that has been uniformly cooled, the bent portion of the damping steel sheet W can be uniformly cooled. In addition, once cooled cooling block
Since 25 has a large heat capacity, it does not easily warm up and can reduce the consumption of liquid nitrogen.

In this way, the bending portion of the damping steel plate W is placed on the cooling surface 33 of the cooling plate 31 that has been uniformly cooled, and the cooling is performed uniformly. Can be performed.

Next, an auxiliary device of the bending cooling device, which is a main part of the present embodiment, will be described.

The bending cooling device 17 is provided with a work holding device 35. More specifically, as shown in FIG. 1, bases 37R and 37b are provided on both sides of the folding cooling device 17, and guide posts extending in the vertical direction are provided on the bases 37R and 37b. 39R and 39L are erected. The ends of the piston rods 41R, 41L are fixed to the bases 37R, 37b, and the piston lots 41R, 41L are provided with air cylinders 43R, 43L so as to be vertically movable. A work holding member 45 having, for example, a plate shape is connected to the lower portions of the air cylinders 43R and 43L, and the guide posts 39R and 39L are mounted.

With the above configuration, when the bent portion of the damping steel plate W is placed on the cooling surface 33 of the cooling plate 31 in the bending cooling device 17 and is operated by the air cylinders 43R and 43L, the work holding member 45 is lowered. Then, the damping steel plate W is pressed from above. Therefore, even if there is a non-uniform curved portion that is unevenly contacted other than the flat portion where the damping steel plate W is uniformly contacted, the curved portion is pressed by the work holding member 45 to control the curved portion. Since the entire bent portion of the vibration steel plate W uniformly contacts the cooling surface 33 of the cooling plate 31, it can be cooled uniformly.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. For example, in the present embodiment, an example has been described in which the work holding member 45 of the work holding device 35 is moved up and down by the air cylinders 43R and 43L, but the work holding member 45 may be rotated by a rotating device to hold the work W. I do not care.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, when a work is cooled by the bending cooling device, the work is held by the work holding device from above and the bending cooling device is used. The work can be uniformly and efficiently cooled by pressing the work uniformly on the cooling surface. Thus,
When bent by a bending machine, a bent product with high accuracy can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an auxiliary device of a bending cooling device provided with a work holding device for holding a work in the bending cooling device, FIG. 2 is a perspective view showing an example of a bending cooling device, FIG. 3 is a side view showing an example of a mold portion of a bending machine, and FIG. 4 is an explanatory view when cooling a work by a conventional bending cooling device. 17… Bending cooling device 35… Work holding device 39R, 39L… Guide post 43R, 43L… Air cylinder 45… Work holding member

Claims (1)

(57) [Claims] 1. A folding cooling device comprising a work holding device for holding a work placed on the bending cooling device for cooling the work from above when cooling the work. Auxiliary device of the device.