JPH07179824A - Bonding method - Google Patents

Abstract

PURPOSE:To efficiently bond a metallic material to a nonmetallic material at a lower cost with a small-sized simple apparatus. CONSTITUTION:This loading method comprises superposing a metallic material 1 on a nonmetallic material 2 through an adhesive 3 and thermally melting the adhesive 3 with application of pressure to bond the materials 1 and 2 with the adhesive 3, the melting being accomplished by pressing electrodes 51 against the material 1 and permitting an electric current to flow through the material 1 to directly heat the material 1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a bonding method. More specifically, the present invention relates to improvement of equipment for implementing a bonding method for bonding a metal material and a non-metal material with an adhesive, bonding cost, and the like.

[0002]

2. Description of the Related Art Conventionally, as an adhesion method for adhering a metal material and a non-metal material with an adhesive, for example, a metal material and a non-metal material are superposed with an adhesive in between and pressed together by a jig. It is heated in the state that it is made into a solid state and integrated under pressure. For example, a brake shoe used as a metal material for a drum brake of a vehicle and a lining as a non-metal material that forms this friction surface are tunnels in a state in which they are pressed and integrated with a jig several times larger. There is a method in which an adhesive is heated and melted in a hot atmosphere inside the heating furnace to bond the brake shoe and the lining together.

According to this conventional bonding method, a heating furnace having a length of several meters to several tens of meters and pressure-integrated is formed in several steps.
It is set so as to pass through the heating furnace for about 0 minutes, so that the adhesive is in a homogeneous molten state capable of reliably adhering a metal material and a non-metal material. For this reason, as a means for increasing the adhesion efficiency, a pressure-integrated jig is continuously supplied to the heating furnace by a conveyor mechanism or the like.

[0004]

In the above-mentioned conventional bonding method, a jig which is heavy and several times larger must be continuously passed through the heating furnace. For example, when the brake shoe and lining are about 0.5 kg, the jig is about 5 kg and 1
Since it is 0 times or more, there is a problem that the equipment for performing with high adhesion efficiency becomes large and complicated.

Further, the heating furnace is heated from about 200 ° C to ~ 230 ° C.
Since the temperature was raised to ° C and passed for about 40 minutes, it took a very long time and automation was difficult.

Further, the combustion heat of white kerosene or the like is used as the heat source of the heating furnace, but the thermal efficiency is as low as about 20% or less,
There is a problem that the adhesion cost increases.

The present invention has been made in consideration of such problems, and it is an object of the present invention to provide a bonding method which can be carried out with a high bonding efficiency by a small and simple facility and has a low bonding cost. And

[0008]

In order to solve the aforementioned problems, the bonding method according to the present invention employs the following means. That is, according to the first aspect of the present invention, in the bonding method, the metal material and the non-metal material are overlapped with each other with the adhesive interposed therebetween, pressed and heated, and the metal material and the non-metal material are bonded by the heat-melted adhesive, The electrode is pressed against the metal material to heat it directly by applying electricity.
It is characterized in that the adhesive is heated and melted by heating the metal material.

According to a second aspect of the present invention, in the bonding method of the first aspect, a plurality of combinations of metal materials, non-metal materials, and adhesives to be bonded are adjacent to each other, and the electrodes pressed against the metal materials of each group are connected in series. It is characterized in that the metal materials of each set are simultaneously subjected to direct electric heating at the same time.

[0010]

According to the above-mentioned means, the metal material itself is heated by Joule heat by direct electric heating to heat and melt the adhesive. The heat-melted adhesive bonds the metal material and the non-metal material. When the electrodes pressed into contact with the metal material are connected in series, a plurality of metal materials are simultaneously heated by electric conduction.

[0011]

EXAMPLE A first example of the bonding method according to the present invention will be described below with reference to FIG.

In this embodiment, a metal material 1 made of a brake shoe used for a vehicle drum brake and a non-metal material 2 made of a lining forming a friction surface of the brake shoe are used.
It shows the case where and are adhered via the adhesive material 3.

The metal material 1 is made by assembling steel plates into a T shape by welding or the like. The non-metal material 2 is formed by mixing short fibers such as asbestos with a binder of thermosetting resin, pressurizing and heating, and molding into a curved plate shape. The adhesive 3 melts when heated and exhibits adhesiveness. For example, a phenolic resin adhesive having strong resistance to impact, bending, and peeling is preferable, and the trade name is “Cemedine CS-271”.
"1" is a nitrile-phenol type and is used because it has a high curing temperature and excellent heat aging resistance.

At the time of bonding, first, the metal material 1 and the non-metal material 2 are superposed with the adhesive 3 interposed therebetween.

The means for interposing the adhesive 3 between the metallic material 1 and the non-metallic material 2 is applied by a method corresponding to the property of the adhesive 3.
Spraying or the like is selected. The intervening work of the adhesive 3 is usually performed at room temperature, although it depends on the property of the adhesive 3.

Next, the metal material 1 and the non-metal material 2 laminated with the adhesive 3 are pressed by the jig 4.

The jig 4 is made of an insulating material and has a clamp shape in which the metal material side 41 and the non-metal material side 42 face each other. It is preferable that one of the metal material side 41 and the non-metal material side 42 is a fixed side and the other is a moving side so that pressure and pressure release can be efficiently performed.
Both the first and the non-metal material side 42 are made of a material having a good heat insulating property so that heat radiation can be prevented.

After that, the electrode 51 of the electric heating device 5 is directly pressed against the metal material 1 to directly heat the metal material 1 by electric conduction.

This direct current heating device 5 includes an AC power source 52.
The primary circuit 53 connected to is equipped with a thyristor 54, so that the current control of the primary circuit 53 is possible. In addition, the secondary circuit 56 is connected to the primary circuit 53 via the transformer 55,
The electrode 51 is connected to the secondary circuit 56 so that it can be transformed into a low voltage corresponding to the metal material 1 having a small impedance. An infrared thermal sensor 57 that detects the temperature of the metal material 1 is connected to the thyristor 54 of the primary circuit 53.

When the metal material 1 is directly energized and heated, Joule heat causes the metal material 1 to generate heat to heat and melt the adhesive 3. Then, the metal material 1 and the non-metal material 2 are bonded by the adhesive 3 that is heated and melted. Although the impedance of the metal material 1 increases due to the temperature rise due to the heat generation of the metal material 1, the metal material 1 of the infrared heat sensor 57
Based on the temperature detected by the thyristor 54, the primary circuit 5
This can be dealt with by performing the current control of 3.

This direct electric heating does not require a heating furnace or a mechanism for passing through the heating furnace as in the conventional example, and the present invention attaches and detaches the electrode 51 to and from the metal material 1 when passing through the conventional heating furnace. Since the bonding process can be performed continuously simply by performing the above, the bonding can be performed with high bonding efficiency without increasing the size and complexity of the equipment.

Further, although the thermal efficiency of the conventional combustion heat of white kerosene does not exceed 20%, the metal material 1 itself generates heat by the direct current heating, and the thermal efficiency becomes about 80%, and the thermal efficiency becomes high. Further, by making the jig 4 a material having a good heat insulating property, it is possible to prevent the heat generated by the metal material 1 from being radiated unnecessarily. Therefore, the thermal efficiency is increased and the adhesion cost is reduced.

Further, with respect to the ordinary adhesive 3, it will be in a homogeneous molten state by heating by direct energization for several minutes, and effective adhesiveness will be exhibited. Therefore, the nonmetallic material 2 does not have to be heated for a long time, and the thermal denaturation of the nonmetallic material 2 can be prevented.

The inventor of the present invention has conducted an experiment on a brake shoe and a lining used for a drum brake of an ordinary passenger car, and has obtained a good adhesion effect.

That is, the metal material 1 as the brake shoe and the non-metal material 2 as the lining are pressed by the jig 4 with a total pressure of 1 t, and the AC power source 42 of the direct current heating device 5 is a single-phase 20.
When the voltage of the secondary circuit 56 is set to 0 V, the voltage of the secondary circuit 56 is set to 2 V, the current is set to 330 A, and direct current heating for 3 minutes and 20 seconds is performed to set the metal material 1 to 2
In this experiment, the temperature was raised to 30 ° C. and heating was continued for 4 to 5 seconds.

FIG. 2 shows a second embodiment of the bonding method according to the present invention.

In this embodiment, a plurality of combinations of the metal material 1, the non-metal material 2 and the adhesive 3 to be adhered are arranged adjacent to each other, each set is pressed by the common jig 4, and the direct current heating of each set is performed. The electrodes 51 of the device 5 are connected in series.

According to this embodiment, a plurality of sets of metal materials 1 can be directly energized and heated at the same time, and the adhesion efficiency can be improved.

As described above, in addition to the illustrated embodiment, the non-metal material 2 is adhered to both surfaces of the metal material 1, or the pillar-shaped or cylindrical metal material 1 is used.
It can also be carried out when the non-metal material 2 is adhered to.

Further, it is possible to provide an electrode on a driving mechanism such as a cylinder and clamp the metal agent 1 and the non-metal agent 2 by the electrode itself to heat the adhesive agent 3 to generate heat and bond the adhesive agent 3. .

[0031]

As described above, the bonding method according to the present invention is
In common with claims 1 and 2, a heating furnace or a heating furnace passage means is not required, and since the bonding process can be performed continuously by simply attaching and detaching the electrode to and from the metal material, the bonding efficiency is high with a small and simple facility. There is an effect that can be implemented.

Further, in common to claims 1 and 2, since the metal material itself generates heat to increase the thermal efficiency, there is an effect that the bonding cost is reduced.

Further, in common with claims 1 and 2, since effective adhesiveness to the adhesive can be exhibited by direct electric heating for a short time, there is an effect that thermal denaturation of the non-metallic material can be prevented. .

Further, since only a second aspect of the present invention can directly and electrically heat a plurality of metal materials at the same time, there is an effect that the adhesion efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a conduction circuit diagram showing a first embodiment of a bonding method according to the present invention.

FIG. 2 is an energization circuit diagram of a main part showing a second embodiment of the bonding method according to the present invention.

[Explanation of symbols]

 1 Metal Material 2 Non-metal Material 3 Adhesive 4 Jig 5 Direct Electric Heating Device 51 Electrode

Claims (2)

[Claims] 1. A bonding method in which a metal material and a non-metal material are superposed with an adhesive agent interposed therebetween, pressurized and heated, and the heat-melted adhesive agent bonds the metal material and the non-metal material to each other. A method for bonding, characterized in that an electrode is pressure-contacted with the electrode to directly carry out heating by energization to heat the metal material to heat and melt the adhesive. 2. The bonding method according to claim 1, wherein a plurality of combinations of metal materials, non-metal materials, and adhesives to be bonded are adjacent to each other, and the electrodes pressed against the metal materials of each group are connected in series.
A bonding method characterized in that the metal materials of each set are simultaneously heated by electric current.