JPH04172131A - Auxiliary device of cooling device for bending - Google Patents

Abstract

PURPOSE:To uniformly and effectively cool the work by pressing the work uniformly on the cooling surface of the cooling device for bending from upper side on the work pressing device at the time for cooling the work in the cooling device for bending. CONSTITUTION:The part to be bent of the high dumping steel sheet W is mounted on the cooling surface 33 of the cooling plate 31 on the cooling device 17 for bending, when the air cylinder 43R, 43L is operated, the work presser component 45 is lowered the high dumpling steel sheet W is pressed from upper side. And if the part which contacts uniformly, is not flat and a curved part exists except the flat part contact uniformly with the high dumping steel sheet W, because this curved part is pressed with the work pressing component 45, and the total of the part to be bent of the high dumping steel sheet W contacts uniformly with the cooling surface 33 of the cooling plate 31, the cooling can be uniformly executed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention provides a method for uniformly cooling the part of the workpiece, especially the part to be bent, when bending the workpiece, especially a composite steel plate such as a damping steel plate. This invention relates to an auxiliary device for a cooling device for folding.

(Prior Art) Conventionally, when a workpiece, particularly a composite steel plate such as a damping steel plate, is bent by a bending machine, a bending cooling device is used to cool the part of the workpiece to be bent.

(Problem to be Solved by the Invention) However, as shown in FIG.
There actually exists a portion WB that is not in uniform contact with A. Therefore, even if the cooling surface C is uniformly cooled, if the workpiece W is in uneven contact with the workpiece W, the entire bending portion of the workpiece W will not be efficiently and uniformly cooled.

If the workpiece W is not cooled uniformly, the workpiece W, especially a composite steel plate such as a damping steel plate, cannot be bent with high precision.

The purpose of the present invention is to improve the above-mentioned problems by uniformly bringing the workpiece into contact with the cooling surface of the bending cooling device to achieve uniform and efficient cooling and to obtain folded products with good precision. It is an object of the present invention to provide an auxiliary device for a conventional cooling device that has been folded.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention cools a workpiece placed on a bending cooling device that cools the workpiece. An auxiliary device for the bending cooling device was constructed by equipping the bending cooling device with a work holding device that presses the workpiece from above.

(Function) By adopting the auxiliary device of the bending cooling device of the present invention, the workpiece can be placed on the cooling surface of the bending cooling device and the workpiece can be held down from above by the workpiece holding device. Cools uniformly and efficiently. However, by folding with a folding machine, a folded product with good precision can be obtained.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, for reference, we will provide an overview of a machine that bends workpieces, particularly composite steel plates such as vibration-damping steel plates.

Referring to FIG. 3, since the specific structure of the bending machine 1, such as a press brake, is already known, the description will focus on the bending mold. That is, diamonds are mounted on the lower table 3 of the bending machine 1 via a plurality of die holders 5, extending in a direction perpendicular to the plane of the drawing in FIG. The tip of this diamond is provided with a V-shaped bending groove 9, for example. Moreover, this bending groove 9
Let the angle of be θゎ.

An upper table (not shown) is provided above the lower table 7, and a punch 13 is provided at the lower part of the upper table via a plurality of punch holders 11 so as to have approximately the same length as the diamond. The tip of the punch 13 is provided with a punch cutting edge 15 that protrudes into a V-shape, for example. The angle of this punch cutting edge 15 is assumed to be θ.

With the above configuration, by placing a composite steel plate such as a damping steel plate W in a cooled state on the bending groove 9 of the diamond and moving one of the lower table 3 or the upper table up and down, the bending groove of the diamond is 9 and the punch cutting edge 15 of the punch 13 to bend a workpiece, such as a damping steel plate W, for example.

Here, when bending a normal steel plate at a right angle, for example,
The angle θ of the punch cutting edge 15 and the angle θD of the bending groove 9
By setting θP-θP≦90@ and performing the bending process, a folded product with good precision can be obtained, but when a composite steel plate, such as a damping steel plate W, is bent at a right angle in a cooled state, , the angle 012 of the punch cutting edge 15 and the angle θ of the bending groove 9. , under the above conditions (θ, −〇.≦9
If the bending angle is 0''), a spring-go phenomenon occurs and a highly accurate bent product cannot be obtained.

Therefore, in the case of right angle bending, θ, −〇.

>90@, it is possible to suppress the spring go phenomenon and perform bending with high precision.

When bending the vibration-damping steel plate W as the composite steel plate, since a viscoelastic resin exists between the steel plates, if the bending process is simply carried out, a seagull phenomenon will occur. It is necessary to cool the damping steel plate W before bending.

The bending cooling device 17 that cools the damping steel plate W includes a cooling body 19, as shown in FIG. It consists of A thick heat insulating material 21 is placed inside this cooling body 19.

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

With the above configuration, the bending portion of the split steel plate W as a composite steel plate to be bent, for example, is placed on the cooling surface 33 of the cooling plate 31, and the supply pipe 2 is connected to the cooling gas cylinder (not shown).
9, liquid nitrogen is once built into the cooling block 25, and is gradually vaporized through small holes, and since the cooling surface 33 is insulated and kept cold, the cooling block 25 can be efficiently cooled.

In addition, the cooling surface 33 is enlarged compared to the conventional one, and the cooling gas does not directly hit the bending portion of the damping steel plate W.
Since it is cooled through the uniformly cooled cooling surface 33 of the cooling plate 1-31, the bending portion of the damping steel plate W can be uniformly cooled. Furthermore, since the cooling block 25 cooled by -degrees has a large heat capacity, it does not heat up easily, and the amount of liquid nitrogen consumed can be kept low.

In this way, by placing the portion of the damping steel plate W to be bent on the cooling surface 33 of the cooling plate 31 that has been cooled uniformly and cooling it uniformly, the bending process can be performed with high precision without causing the seagull phenomenon. can be done.

Next, an auxiliary device for the bending cooling device, which is the main part of this embodiment, will be explained.

The bending cooling device 17 is provided with a work holding device 35. More specifically, as shown in FIG. 1, on both sides of the bending cooling device 17, there are bases 37R,
37L, and guide bosses 39R, 39L extending in the vertical direction are provided on the bases 37R, 37L.

Moreover, the piston rods 4 are attached to the bases 37R and 37L.
If the tips of 1R and 41L are fixed, air cylinders 43R and 43 are attached to piston rods 41R and 41L.
L is provided so as to be movable up and down. This air cylinder 4
A work holding member 45 in the form of a plate, for example, is connected to the lower portions of 3R and 43L, and the guide post 39R239L is attached thereto.

With the above configuration, when the portion of the damping steel plate W to be bent is placed on the cooling surface 33 of the cooling plate 31 in the bending cooling device 17 and the air cylinder 43R243L is operated, the work holding member 45 is lowered. Press down the damping steel plate W from above. Even if there is an uneven, curved part that is unevenly contacted in addition to the flat part that the distributed steel plate W is in contact with evenly, this curved part is held down by the workpiece holding member 45 and the vibration is damped. Since the entire bent portion of the steel plate W uniformly contacts the cooling surface 33 of the cooling plate 31, uniform cooling can be achieved.

Note that this invention is not limited to the embodiments described above, and can be implemented in other forms by making appropriate changes. For example, in this embodiment, the work holding part +445 of the work holding device 35 is connected to the air cylinder 43R,
Although the example in which the work holding member 43L is moved up and down has been described, the work holding member 45 may be rotated by a rotating device to hold the work W.

[Effects of the Invention] As can be understood from the description of the above embodiments, according to the present invention, when cooling a workpiece with the bending cooling device, the bending cooling device cools the workpiece from above with the workpiece holding device. By uniformly pressing the workpiece against the cooling surface of the workpiece, the workpiece can be cooled uniformly and efficiently. Therefore, by folding with a folding machine, a folded product with high precision can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of an auxiliary device for a bending cooling device that is equipped with a work holding device that presses a workpiece in the bending cooling device, and Fig. 2 is a perspective view showing an example of the 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 diagram when a workpiece is cooled by a conventional bending cooling device. 17... Bending cooling device 35... Work holding device 39R, 39L... Guide boss 43R, 43L... Air cylinder 45... Work holding member agent Patent attorney Hide Kazu Miyoshi 17... Bending cooling device 35... Work holding device 39R, 39L... Guide boss 43R, 43L... Air cylinder 45... Work holding member stone Fig. 3 Fig. 4

Claims (1)

[Claims] An auxiliary device for a bending cooling device, characterized in that the bending cooling device is equipped with a work holding device that presses a workpiece placed on the bending cooling device from above during cooling.