JPS6389331A - Bonding of frp and metal - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of joining fiber reinforced plastic (hereinafter abbreviated as FRP) and metal, and more specifically relates to a cylindrical object made of FRP, a roll header, and a propeller shaft. Related to adhesive bonding with metal fittings such as yokes.

[Conventional technology]

FRP is lightweight and highly rigid, and exhibits excellent performance when used in various structures, but the joints with other structural members are
Generally, the shape is complex and wear resistance, scratch resistance, etc. are also required, so metal fittings are bonded with FRP by adhesive to increase the adhesive strength and the reliability of the adhesive. It is very important to improve the mechanical bonding accuracy in adhesion. Conventionally, in adhesive bonding between this FRP cylindrical object and a metal fitting, the adhesive gap between the inner diameter of the cylinder and the outer diameter of the fitting is 70 to 200 μm (
The conventional technique is to insert the metal fitting into the nutrate as shown in Fig. 2 while ensuring a radial clearance, or to insert and bond the metal fitting with two tight fitting parts as shown in Fig. 3. .

[Problem that the invention seeks to solve]

In adhering the joint straight type metal fitting shown in FIG. 2, in order to ensure adhesion strength, the adhesion is usually performed with the adhesion gap within the range of 70 to 200 μm (radial gap). Therefore, when the adhesive heats and hardens, the viscosity of the adhesive decreases, causing the metal fitting to move slightly within the adhesive gap, resulting in misalignment or mounting angle between the center of the FRP cylindrical object and the center of the metal fitting. , it is not possible to obtain highly accurate straightness. In addition, if the bonding gap is made small in order to restrict delicate movement during bonding heating, the bonding 4
The adhesive in the gap is pushed out, and after curing, the metal fitting contracts as it cools, creating a gap and reducing adhesive strength.

Therefore, it is currently very difficult to ensure mechanical bonding accuracy and adhesive strength. In addition, the adhesive method shown in Figure 3 has better mechanical joining accuracy than the adhesive method described above, but since there are two tight fitting parts, insertion is extremely difficult, which not only takes time and effort for the adhesive work. During insertion, the adhesive applied to the inner periphery of the FRP cylinder is scraped off by the tightly fitted part of the fitting tip, which causes unevenness of the adhesive and reduces adhesive strength and reliability. be.

[Means for solving the gap L1 point] In order to solve the above-mentioned problems, the present inventors have arrived at the present invention as a result of intensive studies. The gist of this is that when bonding metal to the inner peripheral edge of an FRP cylindrical object, by providing a part of the bonded metal with a tight fitting part, the adhesive bonding strength and mechanical bonding accuracy can be improved. The key lies in the bonding method between FRP and metal.

The present invention is divided into a part whose purpose is to maintain mechanical bonding accuracy without expecting adhesive strength, and a part whose purpose is only to share adhesive strength without expecting accuracy. The present invention provides an adhesive bonding method that combines both functions and facilitates the bonding work.

The present invention will be explained below with reference to FIG.

By providing one tight fitting part on the shaft end side,
The movement of the metal fitting is restricted due to the decrease in viscosity when the adhesive is heated and cured, and the adhesive strength is shared by the tight fitting part first coming into contact with the inner diameter of the cylinder to prevent the adhesive from flowing away due to thermal expansion of the metal. The adhesive gap between the parts is maintained even during thermal expansion. In addition, since there is no tight fitting part at the tip of the metal fitting, it is very easy to insert, which not only improves the workability of gluing, but also prevents the adhesive from being scraped off at the tip of the metal fitting during insertion. Since the adhesive is compressed during insertion, the adhesive strength and reliability are improved.

〔Example〕

The present invention will be specifically explained below using Examples.

Example 1 A carbon fiber-reinforced plastic cylinder with an inner diameter of 85 mm and an outer diameter of 92 mm is fitted with bearings at both ends.The intended length is 40 mm.
I installed a header made by At. The area between the outer end face of the header and the length 8 length is the tight fitting part to ensure adhesion accuracy, the remaining 32 gourd length is the main adhesion part, and the adhesion gap between the cylinder inner diameter and the header outer diameter is 150 μm (radius). gap), and the radial gap at the tightly fitted portion was 20 μm. Apply adhesive to both sides of the cylinder inner periphery adhesive area and the header outer diameter, then insert the header and heat at 110°C x 2 H.
The adhesive was cured by heating. The roundness of the obtained rolled cylinder was 5 μm, and the straightness was 7 μm as measured by the rotational runout of the outer diameter based on both center standards.

〔Effect of the invention〕

The method of joining FRP and metal of the present invention prevents adhesive slack and deterioration of adhesive reliability due to thermal expansion and contraction of gold 4 during adhesive heating, improves adhesive strength, and prevents tight fitting in some cases. The mechanical joint precision of adhesion is high because of the provision of parts (therefore, parts that require a high level of rotational puffing, and parts that require polishing of the FRP inner cylinder part on both center points of metal fittings). It is very advantageously applied in adhesive bonding.

[Brief explanation of the drawing]

FIG. 1 shows an example of the bonding method of the present invention, and FIGS. 2 and 3 illustrate conventional bonding methods. I FRP cylinder 2 Adhesive 3 Metal sweetening 4.5 Micro gap peak lI21 +2 figure

Claims (1)

[Claims] An FRP characterized by increasing adhesive bonding strength and mechanical adhesive bonding accuracy by providing a part of the bonded metal with a tight fitting part when bonding metal to the circumferential edge of an FRP cylindrical object. and metal joining method.