JPH04341825A - Method for adhesion of metal member with plastic member - Google Patents

Abstract

PURPOSE:To make adhere strongly a plastic member made of a thermoplastic resin and with poor adhesiveness and a metal member. CONSTITUTION:A plate-like member 4 made of a porous metal as a bonding member is integrally bonded on an adhering face to a plastic member 2 of a metal member 1. Then, a number of holes 4a of the plate-like member 4 are impregnated with the resin of the plastic member 2 to adhere the metal member with the plastic member.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bonding a metal member and a plastic member to a plastic member such as a thermoplastic resin having poor adhesion.

0002

2. Description of the Related Art A conventional method for bonding a plastic member such as a thermoplastic resin with poor adhesion to a metal member is as shown in FIGS. 3 and 4. As shown in FIGS. When adhering to a member 2 made of a resin with weak adhesive strength, first, one side of the metal piece 1 is sandblasted to form unevenness 3, and the surface with the unevenness 3 is heated to the melting temperature of the resin. By bringing the metal piece 1 and the member 2 into contact with each other and embedding the convex portion in the resin, adhesive force is provided between the metal piece 1 and the member 2.

0003

[Problems to be Solved by the Invention] However, in order to firmly bond the metal piece 1 to the member 2 made of thermoplastic resin, etc., which has poor adhesion as described above, it is necessary to strengthen the mechanical bond by the anchor effect. It is important to note that in the conventional method, only small irregularities 3 are formed on one side of the metal piece 1 by sandblasting, so the above-mentioned anchoring effect is weak, and therefore the adhesive force is weak.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a bonding method that provides a high adhesive force for bonding plastics such as thermoplastic resins, which have poor adhesive properties, to metal members.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the present invention, in adhering a plastic member and a metal member, combines a porous metal member to one side of the metal member, and then This method involves impregnating the plastics to be bonded into a large number of holes in a porous metal member that is integrated with the member. As a method for joining the metal member and the porous metal member, when welding is used, molten metal may be poured into a large number of holes in the porous metal.

[0006]

[Operation] When a porous metal member is bonded to a metal member and the porous metal member is brought into contact with plastic heated to a melting temperature, the molten plastic enters the pores in the porous metal. By solidifying in this state, a strong mechanical bonding effect can be obtained.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an example of the steps of implementing the method of the present invention, for example, a case where a metal piece 1 and a member 2 made of thermoplastic resin are bonded together.

[0009] A plate-like member 4 made of porous metal as a joining member is firmly joined to one surface of the adhesive side of the metal piece 1 by welding 5 over the entire circumference or at multiple points, and then heated. The member 2 made of plastic resin is heated to the melting temperature of the resin, and the porous metal plate member 4 is placed on the surface of the member 2 and immersed therein, so that the porous metal forming the plate member 4 is heated. A large number of holes 4a are impregnated with resin. Next, the member 2 is allowed to cool. As a result, the molten resin enters into the many holes formed in the plate-like member 4 and is solidified, so that the porous metal plate-like member 4 is melted by the resin that has entered into the many holes. Since they are firmly held, the metal piece 1 and the member 2 are bonded together with a strong mechanical bond with a large adhesive force.

[0010] In the above, the metal piece 1 and the porous metal plate-like member 4 can be joined by welding or by:
Molten metal may be poured into the porous metal constituting the plate-like member 4 to be integrally bonded. Also, when impregnating the pores 4a of porous metal with thermoplastic resin,
Alternatively, the resin may be poured into the pores of the porous metal and bonded.

Note that the metal piece 1 and the thermoplastic resin member 2
When adhering to the metal piece 1, a large number of elongated needle-like or pleated protrusions are formed on one side of the metal piece 1 by electrical discharge machining, and a resin is embedded between the protrusions so that the anchoring effect of the protrusions allows for strong adhesion. You can also do that. Furthermore, the thermoplastic resins shown in the examples are merely examples, and it goes without saying that the present invention can be similarly applied to other resins.

0012

As described above, according to the method of bonding a metal member and a plastic member of the present invention, a porous metal plate member is bonded to one side of a metal member, and a large number of holes in the plate member are bonded to each other. Metal parts and plastic parts are bonded by impregnating resin into them and mechanically bonding them, so a strong mechanical bond can be obtained and metal and plastic can be bonded with strong adhesive force. It can have excellent effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one step in the bonding method of the present invention.

FIG. 2 is a schematic diagram showing how to bond a metal member and a plastic member by the bonding method of the present invention.

FIG. 3 is a schematic diagram showing one step in a conventional bonding method.

FIG. 4 is a schematic diagram showing a state in which a metal member and a plastic member are bonded together using a conventional bonding method.

[Explanation of symbols]

1 Metal piece (metal member) 2 Parts (plastic parts) 4 Plate-shaped member (joining member) 4a hole

Claims (1)

[Claims] Claim 1: A bonding member made of porous metal is bonded to the adhesive side of the metal member, and then the bonding member is immersed in a molten plastic member to fill a large number of holes with plastic. 1. A method for bonding a metal member and a plastic member, the method comprising bonding the metal member and the plastic member by impregnating the metal member and cooling the plastic member.