JPH0449032A - Preparation of non-restrictive type composite laminated thick steel sheet with excellent vibration-damping property - Google Patents

Abstract

PURPOSE:To obtain enough strength for a structural body and excellent vibration- damping properties by a method wherein a foamed resin is formed into a sheet and after the sheet resin is laminated on one or both faces of a thick steel sheet at m.p. of the resin or lower, the whole is heated at m.p. of the resin or higher in a heating oven. CONSTITUTION:A foamed resin is formed into a sheet, which is laminated and joined on one or both faces of a thick steel sheet. For adhesion between the steel sheet and the foamed resin, it is pref. that to ensure uniform adhesiveness over the whole laminated composite steel sheet, it is placed in a heating oven after lamination and the whole is kept at m.p. of the resin or higher. The upper limit of the heating temp. is automatically limited because if the temp. is too high, the resin flows or air bubbles in the resin are crushed and there exists a possibility that the resin itself decomposes and it is pref. actually that it is heated at a temp. of m.p. of the resin of 100 deg.C or below. In addition, as the adhesive strength, enough strength can be obtd. only by fusion but it is possible that after carrying out from the heating oven, rolling or pressing under a light pressure is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a non-constrained composite laminated steel plate having sufficient strength and excellent vibration damping properties.

(Prior Art) Reducing vibrations and noise generated from automobiles, ships, steel structures, etc. is a very important issue in increasing their commercial value. Conventionally, increasing the rigidity of N objects,
Adding mass reduces vibration and noise by moving the resonant frequency out of the frequency range of interest.

However, this method tends to make the object heavier or larger. Nowadays, weight reduction and miniaturization are important points in design, so materials with high vibration damping performance are used in areas where vibration and noise occur, and gumbing sheets made of viscoelastic materials are used. Methods such as gluing are being used.

Materials with high allocation performance include, for example, Japanese Patent Application Laid-open No. 60-823.
No. 49, JP-A No. 63-278988, etc., a viscoelastic substance such as a thermoplastic resin or a thermosetting resin is bonded to one or both sides of a steel plate, or is sandwiched between two steel plates. There is a laminated steel plate that is embedded. These laminated steel plates are mainly limited to thin steel plates, and they have problems in terms of strength when used alone as structures. For this reason, the general method is to construct a structure using ordinary thick steel plates and then glue gunbing sheets to the parts where vibration damping properties are required. However, this method has problems in terms of construction efficiency and cost depending on the structure.

(Problems to be Solved by the Invention) The present invention solves the problems of the prior art and provides a method for manufacturing a non-restricted composite laminated steel plate with excellent vibration distribution properties6.
The composite thick steel plate according to the present invention has sufficient strength as a structure and at the same time has excellent vibration damping properties.

(Means for Solving the Problems) The gist of the present invention is to provide a non-constrained composite laminated thick steel plate with excellent distribution properties, which is made by laminating foamed resin on a thick steel plate! +! In the dispatch,
The process is characterized by forming the foamed If resin into a sheet, laminating the sheet-like resin on one or both sides of a thick steel plate at a temperature below the melting temperature of the resin, and then heating the whole in a heating furnace to a temperature above the melting point of the resin. A method for manufacturing a non-restrained composite laminated thick steel plate with excellent vibration damping properties, and a method for manufacturing an unrestrained composite laminated steel plate with excellent vibration damping properties in which a foamed resin is laminated on a thick steel plate. Form into a sheet, and process the resin sheet at a temperature below the melting point of the resin! ! After laminating on one or both sides of the LW4 plate, the whole is heated in a heating furnace to a temperature higher than the melting point of M fat, and after being extracted from the heating furnace, it is lightly rolled down with a roll or press. This is a manufacturing method for constrained composite laminated thick steel plates.

(Function) The distribution material effectively exhibits its function by combining the viscoelastic body and the constraining layer. The restraint layer is il! In addition to achieving i-rigidity, it also helps to improve the vibration damping properties of the viscoelastic body. The unrestricted type, in which the gunbing sheet is adhered to the steel plate, uses bending deformation in the tensile direction of a viscoelastic body, and the restrained type, in which the gunbing sheet is sandwiched between steel plates, absorbs vibration energy through shear deformation and consumes it as heat. targets the unrestricted type of At7 people.

Foamed resin contains a large number of bubbles in the resin, and compared to ordinary resin, it has excellent not only vibration damping properties but also sound absorption and heat insulation properties due to the energy absorption of air molecules within the bubbles.

The degree of foaming can be arbitrarily changed by changing the amount of foaming agent mixed into the resin. In addition, there are many thermoplastic resins and thermosetting resins as base resins, including polyolefin resins, polystyrene resins, and polyfurthane resins.6 In the present invention, depending on the purpose and application, Commercially available foam resins (resistances can be selected arbitrarily) By forming these foam resins into sheets and laminating them and bonding them, construction efficiency can be greatly improved compared to conventional methods such as gluing gunbing sheets after construction of structures. 6 The adhesion between the steel plate and the foamed resin is due to the fusion of the resin, so the adhesive interface needs to be heated to a temperature higher than 5000 Hz. In order to ensure adhesion, after lamination, it is charged into a preheating furnace.
It is preferable to hold the entire mixture at a temperature above the melting point of the resin for about 5 to 60 minutes. The upper limit of the heating temperature is not particularly limited, but if it becomes too high, the resin may flow, the bubbles in the resin may collapse, and ff/III itself may decompose, so there is a natural limit, and in practice, It is preferable to heat to a temperature below the melting point of the resin +100'C.

As for the adhesive strength, the adhesive strength is sufficient just by fusion bonding, but there is no problem even if the adhesive is lightly compressed with a roll or press after being extracted from the heating furnace.

(Example) A sheet-like foamed resin was laminated on one or both sides of thick steel plates having various thicknesses, and then heated in a heating furnace to produce composite laminated steel plates. A strip-shaped test piece was cut out from this composite laminated steel plate, and the loss coefficient, which is an index of vibration damping performance, was measured using the W1 Machine In Beguns method. The results are shown in Table 1.

Compared to a steel plate alone, in the case of the present invention in which foamed resin is laminated, the loss coefficient is significantly improved regardless of the type of resin. be.

(Effects of the Invention) As is clear from the examples, the method of the present invention can be applied to steel plates of various thicknesses, and this steel plate has sufficient strength as a W# structure, etc., and has excellent vibration distribution properties. Moreover, it is inexpensive and can be widely used in structural members that require vibration damping properties, and can be provided in large quantities and at low cost as a material for parts and materials that require vibration damping properties.

Claims (2)

[Claims] (1) In the manufacturing method of a non-constrained composite laminated thick steel plate with excellent vibration damping properties in which a foamed resin is laminated on a thick steel plate, the foamed resin is molded into a sheet shape, and the sheet-shaped resin is thickened at a temperature below the melting point temperature of the resin. A method for manufacturing a non-constrained composite laminated thick steel plate with excellent vibration damping properties, which is characterized by laminating the steel plate on one or both sides and then heating the whole in a heating furnace to a temperature higher than the melting point of the resin. (2) In the manufacturing method of a non-constrained composite laminated thick steel plate with excellent vibration damping properties in which a foamed resin is laminated on a thick steel plate, the foamed resin is molded into a sheet shape, and the sheet-shaped resin is thickened at a temperature below the melting point of the resin. A non-constraint type with excellent vibration damping properties, which is characterized by laminating one or both sides of steel plates, heating the whole in a heating furnace to a temperature higher than the melting point of the resin, extracting it from the heating furnace, and then lightly rolling it down with a roll or press. Manufacturing method of composite laminated thick steel plate.