JPH03150148A - Manufacture of weldable vibration-damping metal sheet used at ultra-high temperature - Google Patents

Abstract

PURPOSE:To manufacture a weldable vibration-damping metal sheet to be used at the ultra-high temperature by interposing glass frit and conductive filler having speci fied value or more of thermal expansion factor or a face on which two metal sheets face each other, dissolving the glass frit by heating and fixing the metal sheets by pressure. CONSTITUTION:A mixture of glass frit 10 or glass slit and conductive filler is sprayed uniformly on a steel belt 1b by a glass frit spraying device 2 and overlapped with a steel belt 1a at the position of a deflector roll 3. Thermal expansion factor of the glass frit 10 to be used should be 8.5 X 10<-6>/ deg.C or over. When the factor is smaller than said number, release between the steel belt or warp of vibration-damping steel is generated, as shrinkage factor is different from that of the steel belts in the course of cooling process. The steel belts are heated in a heating oven 4 and the glass frit 10 is melted. Said heating is carried out in inactive gas such as N2 in order to prevent the steel belts from getting oxidized. The steel belts coming out of the heating oven 4 are passed through the pressure rolls 5, fixed by pressure and integrated to form a vibration-damping steel sheet 1c, and passed through between cooling nozzles 6 to be cooled down, wound on a coiler 8, and cut to manufacture a vibration-damping steel sheet coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field] The present invention relates to a method for manufacturing a weldable ultra-high temperature vibration damping metal plate, which is particularly suitable as a material for parts exposed to high temperatures of 150° C. or higher.

(Prior Art) Weldable composite vibration damping metal plates in which an adhesive layer containing a conductive filler is interposed between two metal plates are disclosed in, for example, Japanese Patent Publication No. 60-912 and Japanese Patent Application Laid-Open No. 62-234917. Some of them have been disclosed in official gazettes, etc.

The former uses vinyl acetate resin, acrylic resin, and other thermoplastic resins, as well as urea resin, melamine resin, epoxy resin, and other thermosetting resins as adhesives.

The latter is made by liquefying a similar resin, mixing it with a conductive filler, and uniformly dispersing the mixture using a spray nozzle. After drying, two metal plates are pressed together using a pressure roll or the like to create a re-weldable composite. It forms a metal plate.

[Problem to be solved by the invention]

However, the conventional composite damping metal plates as described above are laminated and bonded with a viscoelastic resin such as a thermoplastic resin or a thermosetting resin interposed between the metal plates. Because of this, the loss coefficient characteristics in the allocation action are only highly temperature dependent, as shown in the graphs ■, ■, and ■ in Figure 2. In other words,
■ is for room temperature.

■ indicates the loss coefficient characteristics of vibration damping steel plates manufactured for medium temperature use and ■ for high temperature use, and resins are selected to obtain good characteristics corresponding to the temperature suitable for the intended use. are doing. However, as is clear from the graph,
The temperature range in which good characteristics can be obtained is extremely narrow, and no vibration damping metal plate has been developed that can withstand temperatures above 150°C, so the applicable range is approximately 150°C.
There was a major problem in that it was limited to temperatures below 0°C.

The present invention has been made in view of these conventional problems, and aims to solve the above problems by using glass frit as an adhesive for metal plates.

[Means to solve the problem]

In order to achieve the above object, this invention has a thermal expansion coefficient of 8.5X10-h/2 on opposing surfaces of two metal plates.
Provided is a manufacturing method for producing a weldable ultra-high temperature vibration damping metal plate by interposing a glass frit of c or more and a conductive filler, melting the glass frit by heating, and pressing the two metal plates together. It is.

The present invention has the above-described structure, and since glass frit is used as an adhesive between the two metal plates, the vibration-damping metal plate, which was conventionally used for high temperatures, can be used at a temperature of 15.
The range of application can be expanded as a vibration damping metal plate for ultra-high temperatures, which has the property that the loss coefficient does not decrease even at temperatures far exceeding 0°C and around 500°C, similar to those at room temperature. In addition, the coefficient of thermal expansion of the glass frit used is 8.5 x 10-6/℃
Because of the above, when cooling after heating and welding, the shrinkage rate is not much different from that of the metal plate, so no internal stress is generated in the vibration-damping metal plate, and therefore the gap between the metal plates is reduced. 11 No defects such as separation or warping of the metal plate occur.

〔Example〕

The present invention will be described below with reference to drawings and graphs. FIG. 1 is a conceptual diagram of a 52-manufacturing line for metal plates according to the present invention, and is an embodiment in which a copper strip is used as the metal plate.

In the figure, la and lb are steel strips supplied from an uncoiler not shown, and the opposing surfaces of these steel strips are plated as necessary to improve corrosion resistance or adhesion. . First, the tuning band lb sent in the direction of the arrow
A glass frit 10 or a mixture of glass frit and a conductive filler is uniformly sprinkled on top of the steel strip 1a, which is sent separately, by a glass frit scattering device 2.
and the deflector roll are overlapped at the 3rd position.

At this time, the amount of glass frit lO sandwiched between the steel strips 1a and lb is l = 100 g / t + f, depending on the thickness of the strip and the intended use as a product, to provide resistance weldability. For the same reason, the amount of conductive filler such as metal powder mixed in is 1 to 9 for the gap space between both copper strips.
0voj! %.

Next, the superimposed strips are heated in the heating furnace 4 at a required temperature for a required time to melt the glass fliller 1-10. The heating in this furnace is N to prevent oxidation of the tuning belt.
It is carried out in a 2nd class inert gas.

The toning belt coming out of the heating furnace 4 is crimped through a pressure roll 5 and is integrated into a single toning belt, that is, a split steel plate IC, which is cooled by passing between cooling nozzles 6, passed through pinch rolls, and then sent to a coiler 8. The coil is wound into a damping steel plate coil and cut to an appropriate size.

Here, the glass frit lO used has a thermal expansion coefficient of 8
．． The reason why it is set to be 5 x lO-/"c or more is that if the coefficient is smaller than this, internal stress will occur in the copper strip because the shrinkage rate will be different from that of the copper strip in the cooling process after heat fusion. This is because peeling between the copper strips or warping of the split steel plate occurs.In addition, most of the carbon steels currently manufactured have a carbon content ranging from 1.70% to 0.08% or less. , their thermal expansion coefficient is 9.58~11.6X
10-, and the upper limit of the coefficient of the glass frit is therefore limited by corresponding to the carbon content of the steel sheet used for the damping metal sheet.

Examples according to the present invention are shown below.

The metal plate used was a mild steel plate with a thickness of 0.8 IllI, on which glass frit lO was applied at a rate of 10 g/nf, and iron powder was applied on top of it at a rate of 5 voj! %, two mild steel plates 1a and 1b were stacked on top of each other, and heated at 700°C for 2 minutes in a heating furnace 4 under N atmosphere.

The loss coefficient of the vibration-damping steel plate obtained as a result of heating, crimping at 0.5 kg/c with a pressure roll 5, and slow cooling was determined by the second
In the figure, it is indicated by a graph of ■. As is clear from this graph, the Iil loss coefficient has a substantially constant value from room temperature to about 500° C., and is more than 10 times larger than the loss coefficient of 5 for a normal steel plate.

〔Effect of the invention〕

As explained above, according to the present invention, the loss coefficient is almost constant from room temperature to about 500°C, so it can be applied to parts around the engine, exhaust system, muffler parts, etc. It can now be used for parts that are exposed to high temperatures, and has high vibration damping properties and weldability, so the range of applications has been greatly expanded.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a line for manufacturing a damping metal plate for ultra-high temperatures according to the present invention, and FIG. 2 is a graph comparing the present invention and a conventional example with respect to the applicable temperature range and damping properties. la, lb...--Two metal plates, 1c...
・Vibration damping metal plate.

Claims (1)

[Claims] (1) The coefficient of thermal expansion is 8.5 on the opposing surfaces of the two metal plates.
×10^-^6/℃ or more glass frit and conductive filler are interposed, the glass frit is melted by heating, and the two metal plates are crimped together.Weldable ultra-high temperature vibration damping metal plate manufacturing method.