JPS5987146A - Vibration-damping composite steel plate for bending - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention provides a vibration damping composite steel plate in which a synthetic resin layer having vibration damping performance is interposed between two steel plates, using a bending die with a normal die width of 60 to 1 Qmn+. The bending work used relates to a vibration-damping composite steel plate for bending that can be formed with the same workability.

In order to prevent vibrations generated from structural members or other parts of various machinery, equipment, vehicles, ships, etc., it is necessary to modify the installation foundation of the 91 components themselves, paste them with vibration damping material, or Countermeasures have been taken, such as spraying or coating with a polymer solution that exhibits a vibration damping function.

Under these circumstances, in recent years, composite plates have been gradually developed in which a member having a vibration damping function is arranged in the middle part.

A vibration-damping composite steel plate is made by laminating a layer of viscoelastic material such as plastic with a 01 to 0.6 tone of 8 degrees between two steel plates each having a thickness of about 1 wn. By forming such a structure, the added vibrational energy is converted into thermal energy at the hook speed through plastic deformation of the viscoelastic material layer, which effectively damps vibrations. .

By the way, if we compare the vibration damping performance of a conventional composite fN plate for control membranes with the reverberation time, we can see that if it takes 500 seconds to dampen a certain amount of vibration of a normal steel plate, then flill It will be about 61 plates for 61 folds.

However, as long as the stiffness and vibration damping composite steel plate is used as it is as a flat sheet material, it exhibits excellent initial effects without any inconvenience. When shaping into this shape, peeling or scratching should be avoided between the layers, which not only prevents the original breakage function from being fully exhibited, but also reduces the appearance.

A conceptual diagram of the operation of a general bending die and a bonding die is shown in FIG. 1, and this will be explained. The plate-shaped object 2 to be processed, which is placed on the bending mold 1 and the soil, is bent as shown by the broken line by a punch B, which is lowered from above, to achieve the intended purpose. This is because the plate-shaped object V is pressed in a straight line with the center section IX as the boundary. To stand up (to stand up)

However, when a composite steel plate for splitting is processed using the above-mentioned method, the extended part of the plate cannot rise up enough at the fulcrum part of the first rule, as shown in Figure 5, and it becomes a broken line. It is easy to create a shape that leaves an angle y with respect to the indicated original position.

As shown in the enlarged view of Fig. 4, when the tip of the punch B contacts the plate-shaped object 2 to be processed and further pressing force is applied, the plate-shaped object 2V is formed by the contact V of the punch tip. Between the central fulcrum and the fulcrums on both sides formed by the edge of the mold, a compressive force (e) moves toward the punch contact area, and an elongation force moves at the same time on the outside, but in a composite steel plate, these opposing effects occur. It is thought that one of the reasons for this is that the entire system cannot fully follow the above.

On the other hand, bending of a plate-shaped object is generally carried out near the edge, but if the mutual adhesive strength of the composite≦1'4 plates is not sufficient, as shown in Figure 5, the bending of the bent The outer side of the outer plate is e, 7' shorter than the inner side.

The above-mentioned complex) 111 songs and irregularities in length are 9 degrees Celsius.
It is considered that this phenomenon occurs when the shear force of the composite steel plate is small, or when the Young's modulus of the intermediate layer of the composite steel plate is small7.

The present inventors determined that the die width indicated by X in FIG.
I selected the material, studied the relationship between the Young's modulus of the damping material and the angle y, and understood the behavior shown in the graph shown in Figure 6.

The composite steel plate used at this time was made of (3.1 mm) modified ethylene/acrylic acid resin with an allotment rate of 0.5 mm on both sides.
．． Sand Germany with 251ffm steel plate (1lpee material).
This is what I did.

From this result, if a damping composite steel plate with a Young's modulus of 109 to 10 dny/m is used, it will be 60 to 10 dny/m, which is a relatively narrow category among the dies of commonly used molds.
It turns out that there is no problem in practical use even if it is made from chu.

The present invention will be explained below with reference to Examples.

The solid line of the near conditioner as shown in Fig. 7, (
a = 873 rrm, b = 1754 mm
, e = 15 mm), Q, 25 + nm steel plates (IIpCC material), Q, 1 m modified acrylic acid resin (vibration energy loss coefficient '7max = 0.1
0, E-s X 10" dyn/m, 20C)
It was made by bending in a 15W*113 chair using a composite steel plate made of
Met.

In addition, the same operation was performed using vinyl acetate resin (+7
max=0.15. g=7×10"dyn/m',
20C) was repeated using a composite steel plate, but the angle y was a large value of 15°.

[Brief explanation of drawings]

Figures 1 and 2 are conceptual diagrams showing the bending process, and Figure 6 is a 411-plane view of the plate material after the bending process, jf<'y 4
The figure is an explanatory diagram showing the force acting on the plate during bending, Figure 5 is an explanatory view of the edge of the plate after bending, Figure 6 is a graph, and Figure 7 is a perspective view of the entire workpiece. 1... Mold, 2... Board system, Ro... Patent attorney Sanro Kimura representing Ponch

Claims (1)

[Claims] A composite copper plate to be bent by a bending die having a die width of O to 108 and a punch, having a damping material exhibiting a Young's modulus E of at least 10' dyn/m in the intermediate layer, A vibration damping composite steel plate for bending, characterized in that the vibration damping performance ηmaX is 0.05 or more.