JPH01258945A - Vibration regulating metal plate with resistance to high temperature and its manufacture - Google Patents

Abstract

PURPOSE:To make it possible to obtain superior damping property up to a high temperature region and to secure the adhering strength not inconvenient in practical use, by pressing cast iron powders between metal plates with heat and pressure thereby to form a hollow part. CONSTITUTION:A metallic material 2 is sent out from a coil 3, and a predetermined amount of cast iron powders which are adjusted in the particle size thereof is cut out from a hopper 4, so that a layer 4a of cast iron powders is formed. A metallic material 2a is delivered from a coil 3a and layered onto the layer 4a. The thickness of the layer 4a is controlled by a level roller 5. Then, the layer 4a is heated to a preset temperature in a heating furnace 6, and hot pressed by a hot rolling rolls 7 to be a composite steel plate. The composite steel plate is in turn cut into a predetermined length by a cutter 8, and is gradually cooled by a cooling furnace 9 so that the layer 4a is not separated therefrom. In this case, if the rolling conditions are variously controlled, the porosity of the layer 4a can be set at a desired value, for example, within 10-40%. Accordingly, a favorable damping property of the metal plate can be obtained in a high temperature region, with the adhering strength necessary for practical use being secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vibration-damping metal plate on which high-temperature-resistant cast iron powder layers are laminated, and a method for manufacturing the same.

[Prior Art] In recent years, a laminated metal plate in which two metal plates are laminated with a synthetic resin interposed therebetween has been used as a material for vibration isolation or damping.

A large number of documents have been published regarding laminated metal plates, and a representative example is Japanese Patent Application Laid-Open No. 55-156052, which proposed a moldable metal-plastic-metal structural laminate.
JP-A No. 55-123459, which proposes a metal-thermoplastic-golden layered structure.

[Problems to be Solved by the Invention] Problems with laminated steel plates in which a resin layer is interposed between steel plates lie in adhesive strength, weldability, and heat resistance.

It is extremely difficult to fundamentally solve these problems as long as resin layers are laminated.

That is, the adhesive strength is preferably 20 kg 725 mm or more using the T-peel method, but since the resin is bonded by heating at 200° C., it cannot withstand high-strength bonding or use in high temperature ranges. In addition, various methods have been proposed for mixing metal powder into resin for the purpose of improving weldability.
It is not very economical because it uses expensive metal powder. Recently, in connection with vibration and noise, soundproofing walls for ships, automobiles, bridges, specifically Shinkansen trains and expressways, as well as OA in offices,
It has a wide variety of applications, such as noise control work for equipment, and depending on the application, conventional laminated steel sheets using resin are often not applicable due to the aforementioned problems with adhesive strength, weldability, and heat resistance.

In view of the above-mentioned problems, the present invention aims to solve the problems described above by laminating a cast iron layer instead of a resin layer.

[Means and effects for solving the problem] That is, the vibration-damping metal plate of the present invention is characterized in that cast iron powder is arranged between the metal plates to form a void.

Vibration damping materials convert vibration energy into thermal energy and dissipate it, thereby attenuating vibrations and preventing noise. It is widely known that in addition to resin, rubber, and cork, concrete and wood are also effective as damping materials. However, as shown in FIG. 2, the strength and damping performance of a material generally have a contradictory relationship, and it has been desired to develop a material that is good for both.

Gray cast iron has graphite uniformly dispersed in the Fe matrix, so it has superior damping performance compared to ordinary steel. Furthermore, by sintering cast iron powder to form a porous structure with a predetermined air layer, the damping ability of the negative layer can be improved in addition to the damping ability inherent to cast iron. Moreover, if porous cast iron is used as the intermediate member of the sandwich layer, not only can it be expected to have considerable rigidity, but as shown in the phase diagram in Figure 3, it is also more rigid than materials commonly used for vibration damping materials such as resin. It has a high melting point, so it can withstand high temperature use. Furthermore, since it has good electrical conductivity, it is also advantageous from the viewpoint of welding processing.

In detail, as shown in Fig. 1, a cast iron porous layer 1 is placed on a metal base plate 2.
．． The cast iron porous layer 1 preferably has a porous structure with a porosity of 10 to 40%. This is because, as shown in FIG. 4, when the porosity is less than 10, resulting in a dense cast iron layer, the vibration absorption properties are significantly reduced. -When the porosity is 4096 or more, the vibration absorption property improves, but
As shown in FIG. 5, a more porous structure is not preferable because the tensile strength is significantly reduced. Of course, this size is not limited to special uses.

Metal blanks 2.2-a include not only ordinary steel, but also plated steel sheets (zinc, tin, chromium, aluminum, etc.), stainless steel sheets, high-alloy special steels, titanium, aluminum, etc.
Nonferrous metals such as copper can also be used, and the front and back surfaces can be made of different metal plates. Regarding plate thickness, cast iron porous layer 1. Various characteristics can be achieved by arbitrarily setting the front and back plates of the metal blank 2.

Next, the manufacturing method of the present invention will be explained. Figure 6 shows an example of a modified hot rolling process. The metal blank 2 is sent out from the coil 3, and a fixed amount of cast iron powder whose particle size is adjusted is cut out from the hopper 4 onto the metal blank 2, and the metal blank 2a fed out from the coil 3a is placed on the cast iron layer 4a. Laminate. A level roller 5 is arranged at the location where the metal blank 2a is laminated onto the cast iron layer 4a to control the thickness of the cast iron layer 4a. Next, the laminated metal plates enter a heating furnace 6, are heated to a predetermined temperature, and are hot-pressed by hot rolling rolls 7. The atmosphere in the heating furnace 6 and the hot rolling roll 7 is desirably non-oxidizing in order to prevent oxidation of the cast iron powder and the surface of the metal plate. The rolled composite steel plate is cut into a predetermined length with a cutter 8, and slowly cooled in a cooling furnace 9 to prevent the cast iron layer from peeling off. Note that by controlling various rolling conditions (rolling temperature, rolling reduction, rolling speed, etc.), it is possible to build the porosity of the cast iron layer 1 to a desired value.

FIG. 7 shows an example of a vertical manufacturing process. The metal blanks 2, 2a are supplied from coils 3, 3a and heated to a predetermined temperature by a heating heater 10. Cast iron is dripped in a molten state from a pot 11, and an inert gas such as Ar gas or N2 gas is injected from the periphery of the dripping stream from the periphery to gas atomize the cast iron.

The granular cast iron powder 4a is HI between the metal blanks 2 and 2a.
The cast iron layer 4a and the metal base plates 2, 2a are pressed together by rolling down the plate to a predetermined thickness using hot rolling rolls 7. The subsequent steps are shown in Figure 6 and the four pillars. The method of layering cast iron on the metal blanks 2, 2a by gas atomization is also possible in the horizontal process shown in FIG. 6 by installing a gas atomization device in place of the hopper 4.

As shown in Fig. 6 above, cast iron powder is laminated with a metal blank,
When rolling after heating, the cast iron powder size is 15
0 to +0001 Jm is appropriate from the point of view of damping properties (porosity), and the rolling temperature is 1050 to 1200°C.
The appropriate rolling reduction ratio is 10 to 40%.

As can be seen from the phase diagram shown in FIG. 3, the rolling temperature is preferably just below the melting point of the cast iron layer. This is because if it is rolled in a completely melted state, it will form a dense structure with a porosity of 10% or less, resulting in a significant drop in vibration damping performance. For the same reason, it is desirable to control the rolling reduction rate so that the porosity of the cast iron powder layer is 10 to 40*, and the rolling reduction rate is 10 to 40%.
is appropriate.

Cast iron powder includes crushed cutting waste from gray cast iron, malleable cast iron, and spheroidal graphite cast iron products, as well as quiche graphite and slag separated from the process of manufacturing foundry pig iron specified in JIS G2202. It is also possible to pulverize coarse-grained iron or directly produce foundry iron by gas atomization or water atomization as shown in FIG. Although there are no particular limitations on the chemical components, it is desirable that C be 3.096 or more, and Si be 1.5!4 or more.

[Example] Next, examples of the present invention will be listed together with comparative examples, but the present invention was carried out using the apparatus shown in Fig. 6.
The results are shown in Table 1. As shown in the table, it can be seen that the metal plate of the present invention has satisfactory vibration damping properties and peel strength.

The relationship between the damping properties and temperature of the damping plates of Example 1 and Comparative Example 2 is shown in FIG. 8, and as can be seen from the figure,
In the comparative example, there is almost no vibration damping function at temperatures above about 200° C., whereas in the present invention, it has become clear that the vibration damping function does not deteriorate much even with temperature changes.

[Effects of the Invention] As explained above, according to the present invention, it was possible to obtain excellent effects in terms of vibration damping properties up to a high temperature range and adhesive strength that is practically acceptable.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of a t111 vibration metal plate according to the present invention, Figure 2 is a diagram showing the relationship between material strength and vibration damping properties, Figure 3 is a state diagram of cast iron, and Figure 4 is a diagram of cast iron. Figure 5 is a diagram showing the relationship between the porosity of the layer and the loss coefficient. Figure 5 is a diagram showing the relationship between the porosity and tensile strength of the cast iron layer. Figures 6 and 7 are diagrams showing an example of the manufacturing process. Figure 8 is a diagram showing the temperature dependence of uniform performance. 1... Cast iron porous layer, 2, 2a... Metal plate, 3.3
a...Coil, 4...Hopper, 4a...Cast iron layer, 5...Level roller, 6...Heating furnace, 7...
Hot rolling roll, 8... cutter, 9... cooling furnace,
I O-... Heater, 11... Pot.

Claims (1)

[Claims] 1. A high-temperature-resistant vibration-damping metal plate in which cast iron powder is arranged between the metal plates to form a void. 2. A method for producing a high-temperature-resistant vibration-damping metal plate, which comprises disposing cast iron powder between metal plates, then heating and hot rolling.