JPS60166367A - Method for bonding metal material to friction material - Google Patents

Abstract

PURPOSE:To bond a metal material powerfully to a friction material, by pretreating a contact layer of the metal material coated with an adhesive to hot cure in bonding the metal material to the friction material by the high-frequency induction heating method. CONSTITUTION:The surface of a metal material is coated with an adhesive, and a contact layer of the above-mentioned adhesive with the metal material is previously hot cured and laminated together to a friction material to carry out the high-frequency induction heating. USE:Bonding of the metal material, e.g. a brake shoe, to the friction material.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a method for bonding a metal material such as a brake shoe or a clutch plate to a II friction material, and more specifically, a high-frequency induction heating method as a heating means during the bonding process. The present invention relates to a method for improving the adhesive effect when used.

(Background of the Invention) Generally, in the manufacture of brake seats for use in drum brakes, for example, a sheet body, usually made of metal, and a sheath lining made of an organic or inorganic material molded into a predetermined shape are heated. Usually, they are bonded via a curable resin adhesive coating layer, and this bonded state is maintained using a large-sized cleaner, etc., and then placed in an open heating furnace for heat treatment.

However, this method not only requires large-scale heating furnace equipment, but also requires a long time for heat treatment, so there are many problems in improving productivity.

Therefore, the present inventors conducted various studies with the aim of downsizing the equipment and speeding up the heat treatment, and decided to apply the high-frequency induction heating method, which has recently been used industrially in small heating furnaces. We focused on the fact that if it were possible to do so, it would have the advantage of allowing rapid heat treatment with small equipment.

By the way, when performing adhesive processing using such a high-rise induction heating method, even if the same adhesive as in the case of the conventional open method is used, the adhesive force between the metal member and the friction member of the obtained product is not sufficient. Something happened.

Therefore, regarding this problem, after considering the process of adhesion treatment and the situation of product destruction, it was understood that the reason why sufficient adhesive strength could not be obtained was due to the following points.

That is, when performing adhesive processing using a conventional open-type heating device, (a) the adhesive is applied and the organic solvent is evaporated;

Mouth, air dry or at a temperature of 80℃~100℃ for 15 minutes~
Dry for about 30 minutes @c. Keep the joints under pressure while assembling.

2.Cure the adhesive by heating it in the open.

A curing mechanism that moves the adhesive from a fluid range to an assimilation solidification range is performed by applying two irradiation processes, but in the case of high-frequency induction heating, the heating time for the adhesive process is extremely long. Even in a short period of time (approximately several tens of seconds), the transition from the flow range to the assimilation solidification range in the adhesive curing mechanism is not clear, and the adhesive hardens while flowing, resulting in In particular, as can be understood from the situation of product destruction tests, interfacial destruction of adhesives that come into contact with metal members is likely to occur.

(Object of the invention) The object of the present invention is to provide an adhesion method that can ensure sufficient adhesive strength by taking into consideration the curing mechanism of the adhesive when heat-treated by the above-mentioned high-frequency induction heating method. be.

(Summary of the Invention) The gist of the present invention, which has been made to achieve the above-mentioned object, is to provide a method for bonding a metal material and a friction material through an adhesive and applying high-frequency induction heating to bond the metal material and the friction material. A method for adhering a metal material and a friction material, characterized by applying an adhesive to the surface of the material, and performing a pretreatment (preheating treatment) to heat-cure the contact layer of the adhesive with the metal material. .

In addition, in this type of bonding, a primer layer (adhesive for the purpose of rust prevention and improved adhesion) is laminated on the surface of the metal body, and a thermosetting resin adhesive layer is laminated on top of the primer layer. Since the friction member is usually integrated with the primer, the preliminary heating treatment of the contact layer with the metal member described above is carried out on only the primer layer.

(Example of the invention and its effects) An example of the invention will be described below while comparing it with a comparative example.

In this embodiment, the brake seat of the drum brake
An arc-shaped friction material made of an organic or inorganic material is adhered to the outer circumferential surface of the rim.

The adhesion procedure is to apply a layer of primer (resin adhesive or diluted thermosetting adhesive, etc.) to the outer circumferential surface of the rim, and then apply a thermosetting resin (rubber adhesive, etc.) to the inner surface of the friction material. etc.) were applied in a layered manner, and after performing a preliminary heating treatment of heating and drying these coated layers under predetermined conditions, the two were laminated together under pressure and subjected to high frequency induction heating treatment. In addition, in the comparative example, air drying was simply performed.

The high-frequency induction heating method involves compressing and holding the outer circumferential surface of the rim of the shoe body and the inner circumferential surface of the friction material under uniform pressure using an adhesive, and then A high-frequency induction heating coil having a continuously meandering curved portion extending across both ends in the circumferential direction was brought close to face each other to perform high-frequency induction heating.

In addition, the adhesive force was measured by applying a shearing force to the brake shoe body and the friction material, and the maximum acting force at the time of peeling was taken as the adhesive force. The test results are shown in the table below.

As is clear from the table above, simply air-drying the primer layer on the rim side, which is a metal member, will not provide sufficient adhesive strength for the product; on the other hand, heat drying the primer layer on the rim side In this case, it has become clear that sufficient adhesive strength can be ensured by simply air-drying the adhesive on the friction member side.

According to studies conducted by the present inventors, the preheating treatment for heating and drying the adhesive (7″ limer) on the metal member side in the present invention is carried out at 80 to 100°C for 10 minutes or more, preferably about 20 minutes. However, this is not fixed depending on the type of primer, and may be selected as appropriate.

(Modifications of the Invention and Effects thereof) The present invention applies not only to the brake shoes of the drum brakes described above, but also to bonding of metal members and friction members, such as clutch 7 acings for automobiles, friction blocks for multi-stage brakes for industrial machinery, and fathoms. It can be similarly applied to things that cause

(Effects of the Invention) As described above, in bonding a metal member and a friction member using a high-frequency induction heating method, the present invention performs preliminary heating treatment on a predetermined portion, thereby reducing the amount of adhesive that comes into contact with the metal member. The flow during the bonding process of the layers is suppressed, and therefore only curing progresses in this area during the bonding process, ensuring good adhesion even without interfacial destruction. The usefulness of heating methods is great because they can be used effectively.

Claims (1)

[Claims] In the method of bonding a metal material and a friction material through an adhesive and applying high-frequency induction heating, the adhesive is applied to the surface of the metal material, and the contact layer of the adhesive with the metal material is heated in advance. A method for adhering a metal material and a friction material, which is characterized by performing a pretreatment to harden the material.