JPS5926640A - Vibration controlling composite steel plate - Google Patents

Abstract

PURPOSE:To obtain the titled steel plate having a high vibration controlling efficiency over a wide temperature range from normal to high and a favorable anti-exfoliating efficiency by a method wherein a thermoplastic resin which is viscous and elastic and which has a vibration damping capacity is interposed between two sheets of thin steel plates. CONSTITUTION:The thermoplastic resin such as denatured polyolefin or a vinyl ascetate type denatured polymer having a Young's modulus of higher than 10<5>dyn/cm<2> at temperatures in a range from ordinary to high is interposed between the two sheets of thin steel plates. The composite steel plate of the above structure is made to have a coefficient (eta) of vibratory energy loss of higher than 0.03, preferably higher than 0.05, so that the plate performs a stabilized vibration controlling function in a wide temperature range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves interposing a thermoplastic resin having viscoelasticity and the property of absorbing and damping vibrations between two thin steel plates.
This is a composite steel plate for splitting that has a vibration energy loss coefficient (η) maintained above a certain value over a wide temperature range from room temperature to high temperature, and in particular relates to a composite steel plate for splitting that is used for shims in disc brake pad kits. be.

To prevent vibrations generated from structural members or other members of various machinery, equipment, vehicles, ships, etc., it is necessary to modify the installation foundation, thicken the member itself, apply vibration damping material, or Countermeasures have been taken, such as spraying or coating polymer solutions that exhibit a vibration damping function.

Under these circumstances, in recent years, composite plates in which a member having a vibration damping function is arranged as an intermediate layer have been gradually developed.

For example, a composite plate obtained by laminating two thin steel plates with a thickness of about 1 inch or less with a thin (for example, about 0.1 to 0.6 inch) viscoelastic material layer such as plastic, The vibrational energy applied thereto is rapidly converted into thermal energy through shearing deformation of the viscoelastic material layer, thereby exhibiting the function of effectively damping vibrations (hereinafter, for convenience of explanation, the vibrational energy will be referred to as ``absorbing''). )It is believed that.

For this reason, the above-mentioned plastic-filled composite boards are mainly used for vibration prevention and noise prevention, for example, as cabin interior materials for living quarters on ships, for general building materials such as partitioning materials, or for housing parts in automobiles, etc. Various forms of use are possible, such as use as a support member.

This type of composite plate has a structure in which a plastic film is held between two thin steel plates in the form of a sandwich, so it is relatively easy to manufacture and has the advantage of being low cost. However, conventional composite plates have not been eliminated from essential flaws, such as being easy to peel off and being unable to maintain stable distribution performance over a wide temperature range, so composite plates using plastic films have become obsolete. However, it has not yet been fully utilized.

Under these circumstances, the present inventors investigated a composite steel plate for vibration damping that maintains high vibration distribution performance from room temperature to high temperature and also provides satisfactory peeling resistance. The invention has been achieved.

That is, the present invention provides Young's modulus (E
) is 105dνn/d or more, a thermoplastic resin with viscoelasticity and vibration damping performance is interposed between two thin steel plates, and the vibrational energy loss coefficient (η
) is maintained at 0.06 or more, and particularly relates to a vibration damping composite steel plate for use in shims of disc/brake pad kits.

The thermoplastic resin used in the present invention is required to have viscoelasticity as a basic property. Furthermore, this resin can be used at room temperature ~
10' dyn over a temperature range of 140°C
It is necessary to have a Young's modulus of /cr1 or more in order to improve the peel strength.

Examples of synthetic resins with such characteristics include, for example, modified polyolefins such as modified polypropylene, acrylic acid-based modified polymers, and vinyl acetate-based resins such as EVA. Examples include modified polymers.

For example, the Young's modulus of nylon and certain types of polyethylene at room temperature is io9~101Odyn/cIL, which falls under the above conditions, but in this case, the temperature dependence is large, so when the atmosphere is in a high temperature range, E≧105cly.
We confirmed a behavior in which the conditions of n/cr& could not be cleared.

When forming a composite steel plate, the most efficient method of interposing resin between two thin steel plates is as follows:
One possible method is to sandwich a synthetic resin sheet between continuously supplied steel plates and press them with rolls, but there are also other methods, such as laminating them in a batch process or by giving fluidity to the resin and pressing the sheets between the steel plates. It may also be formed by supplying this to the.

The thickness of the thermoplastic resin interposed between two steel plates naturally varies depending on its intended use; for example, when used as a shim for automobile brake pads, the thickness is approximately 0.05 to 0.2.
Selected from the range of 0, but most commonly around 0.05
~0.70 ttt+ is often used.

There are no particular restrictions on the steel plates used in the composite steel plate, and the thickness varies depending on the application, but two steel plates with a thickness within the range of about 0.20 to 0.70 m are generally used. In this case, it is easier to use the two steel plates with the same thickness in terms of material procurement, but it goes without saying that steel plates with different thicknesses may be used.

Among the composite steel plates constructed from two steel plates and a thermoplastic resin as described above, those that exhibit a stable distribution function in a wide temperature range are those that are measured and calculated by the mechanical impedance method of the composite steel plate. It is required that the vibration energy loss coefficient (η) is 0.03 or more, preferably 0.05 or more.

When this value becomes smaller than 0.06, the vibration damping effect does not become extremely bad, but generally there is a tendency that it becomes difficult to obtain a sufficient vibration damping effect.

Since the composite steel plate for vibration damping obtained according to the present invention has a relatively thin overall thickness, it is processed by conventional techniques such as bending, die cutting, and riveting in the same way as general metal plates. It is extremely useful as it can also be used for various purposes.

The present invention will be explained below using specific examples.

Example A composite steel plate was prepared by interposing the indicated thermoplastic resin between two steel plates with a thickness of 0.25 m so that the layer thickness was 0.15 m, and its loss coefficient was determined. As a result, we obtained the results shown in Figure 1.

The thermoplastic resin used had a Young's modulus behavior as shown in FIG. 2 at each temperature.

As an example of the use of the composite steel plate for splitting, it was used as a sound deadening material for automobile disc brakes.

Conventional sound deadening materials have a thickness of 0.1 to 0 on both sides of a steel plate of approximately 0.4 m.
．． Since it is lined with 2 mm 8 degree rubber, improvements in durability were desired due to the frictional force and heat generated during braking.

Conceptually, in the disc brake shown in Fig. 6, the hydraulic cylinder, pad, and sound deadening material were arranged as shown in Fig. 4, and the sound deadening function and durability of the sound deadening material were tested. It was confirmed that the product is superior to other products.

[Brief explanation of drawings]

Figure 1 is a graph showing the vibration damping function of composite steel plates for vibration damping, Figure 2 is a graph showing the Young's modulus behavior of thermoplastic resin, Figure 6 is a conceptual diagram of a disc brake, and Figure 4 is FIG. 2 is a schematic diagram of a disc brake in which a sound deadening material is used as a shim. 1...Disk 2...Hydraulic cylinder 6...Brake pad 4...Butt auxiliary material 5...Sound deadening material agent Patent attorney Sanro Kimura Diagram 2 toto 8 \\888, Intermediate \I Abusive E "°°\. 1o \\〈 \. Admiration \\\ ξ - 1N Kaisho 59-26640 (4) Figure 3 manga"° \\\ \ 田106 \\\ Figure 4 Page 1 0 continuations Author Satoshi Yamazaki 560-2 Okatsukoku, Atsugi City Nissan Motor Co., Ltd. Technical Center Applicant Nissan Motor Co., Ltd. 2-243 Takaracho, Kanagawa-ku, Yokohama City

Claims (1)

[Claims] Young's modulus (E) at room temperature to 140°C is 105'yn
A thermoplastic resin with viscoelasticity of /cr1 or more and vibration damping performance is interposed between two thin steel plates, and the vibration energy loss coefficient (η) within the above temperature range is 0.03.
A vibration-damping composite steel plate characterized by being held at the above-mentioned level.