JPH01245961A - Combining method for aluminum parts and ferrous parts - Google Patents

Abstract

PURPOSE:To improve the strength and corrosion resistance of both combining parts and to increase the reliability by interposing a Zn alloy between both combining parts of Al parts and Fe parts. CONSTITUTION:An Al parts 1 and Fe parts 2 are first formed in the specified shape. The space subjected to pullout stopping and rotation stopping is formed via an intermediate stock on the combining part 1a, 2a of both parts. The annular insert 3 of the Zn alloy having a sacrificing action and easy to cause a metallurgical combination, etc., is inserted in the space formed between the combined part 1a, 2a thereof. The insert 3 of a Zn alloy, etc., is melted by holding it for specified time by a heating stage, filled up in the space between the combining part 1a, 2a, a melting metal is then solidified by cooling it for specified time at cooling stage and a product is taken off. Consequently, the insert of Zn alloy, etc., is used as the intermediate stock, integrated by metallurgical combining and mechanical combining, the corrosion resistance of the combining part is improved by the Zn sacrificing corrosion-proof action and the combination of high reliability can be held.

Description

[Detailed description of the invention]

1. Field of Industrial Application The present invention relates to a method for joining dissimilar metal materials, and particularly to a method for joining aluminum parts and iron-based parts.

[Conventional technology]

Conventionally, when joining aluminum parts, which are dissimilar metals, to iron parts, mechanical joining methods such as welding, brazing, caulking, press fitting, bolts, nuts, and rivets were used, and iron parts were integrated using aluminum materials. A common method is to cast it in a concrete manner. In addition, there is a magnetic forming method in which electric energy is applied to processing coils such as compression coils, expansion coils, and flat coils to bond dissimilar metal materials by compressing and expanding the workpiece without caulking it. 1977-
As described in Publication No. 144831, the surface of the aluminum alloy is alumite-treated to form an aluminum oxide film, a recess is formed in this film, and the recess is filled with hard metal by electroplating or the like. There are electrical processing methods such as finishing.

[The problem that the invention attempts to solve! ! ]

However, the above-described bonding method has problems with the strength and corrosion resistance of the bonded portion, resulting in low reliability. Especially the casting method for iron parts made of aluminum material. and magnetic forming processing method, both require larger equipment.
The process is complicated and costly, as it requires a large amount of electricity. In addition, in any bonding method, a potential difference is generated between dissimilar metal materials, which tends to cause electrolytic corrosion in a humid environment, which may affect some parts and reduce the strength of the bonded part. It turns out. Therefore, the present invention provides a method for joining aluminum parts and iron parts, with the aim of improving the strength and corrosion resistance of the joint between the aluminum parts and iron parts, and increasing reliability.

[Means to solve the problem]

Therefore, in the present invention, joint parts are formed in aluminum parts and iron-based parts respectively, and when the two parts are joined, an intermediate material such as a zinc alloy is inserted into the space left between the solid joint parts. The aluminum parts and the iron parts are joined by heating and melting the intermediate material.

[For production]

Therefore, since a zinc alloy with sacrificial corrosion protection is interposed between the solidified joints of aluminum parts and iron parts, a metallurgical bond can be formed between the aluminum parts and iron parts, and special equipment and equipment can be used. The bond does not require any corrosion, the strength of the bond is high, and the bond maintains good corrosion resistance.

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Fig. 1 is a work process diagram showing the method of joining aluminum parts and iron parts according to the present invention, and Figs. 2 to 6 show the joining of an aluminum forged yoke and iron pipe based on the work process shown in Fig. 1. FIG. 3 is an explanatory diagram of a work process for manufacturing a propeller shaft. First, in the forming process of step 5101, as shown in FIG.
Next, in the processing process of step 5102, as shown in FIG.
Spaces a and 2a are respectively formed to be prevented from coming out and being prevented from rotating through an intermediate member which will be described later. Forged aluminum yoke formed as described above1. In step 3103, the iron pipe 2 is connected to the joints 1a and 2a as shown in FIG.
is set. At this time, in the space formed between the joint parts 1a and 2a between the aluminum A-made yoke 1 and the iron pipe 2, a ring-shaped material such as zinc alloy, which is easy to form a metallurgical bond and has a sacrificial corrosion prevention effect, is used. Insert 3 is inserted. Here, the metallurgical bonding is a method of bonding by thermal fusion, such as welding, and bonding is likely to occur in materials with similar atomic sizes, such as zinc die casting. Next, in the heating step of step 5104, a temperature of about 400"C is maintained for a predetermined time to melt the ring-shaped insert 3 made of zinc alloy, etc., and as shown in FIG. Then, in the cooling process of step 5105, if the molten metal is cooled for a predetermined time and solidified, the product taken out by Stella 78106 is a product that has completed bonding as shown in FIG. In this way, according to the joining method of the present invention, an insert made of zinc alloy or the like is used as an intermediate material in the joining part between an aluminum part and a steel part, and the parts are integrated by metallurgical joining and mechanical joining. Due to the sacrificial anti-corrosion effect of zinc, the corrosion resistance of the joint is improved and a highly reliable joint can be maintained.In addition, the material strength of the aluminum parts, aluminum RA and yoke 1, is increased. To achieve this, T6 treatment has conventionally been performed, but according to the present invention, no special process is required and the heating process in step 8104 during the process of joining the forged aluminum yoke 1 and the iron pipe 2 can be performed. This can be easily done by setting the time and temperature as shown in FIG.

【Effect of the invention】

As explained in detail above, in the method of joining aluminum parts and iron parts according to the present invention, a zinc alloy or the like is used as an intermediate material between the two parts, and the two parts are integrated by metallurgical joining and a-mechanical joining. , the joint is strong, and the sacrificial anti-corrosion effect of zinc improves the corrosion resistance of the joint, thereby increasing reliability. In addition, intermediate materials such as the zinc alloy mentioned above melt at around 400°C, so they do not require special equipment, and they have good corrosion resistance, so surface treatments such as painting on joints are not required, and they can be manufactured at low cost. can.

[Brief explanation of the drawing]

Fig. 1 is a work process diagram showing the method of joining aluminum parts and iron parts according to the present invention, and Figs. 2 to 6 show the joining of an aluminum forged yoke and iron vibrator based on the work process shown in Fig. 1. FIG. 7 is a graph showing the relationship between time and treatment temperature when T6 treatment is applied to aluminum alloy. 1...Aluminum a yoke, 1a...joint part, 2...
・Iron-based pipe, 2a...Joining part, 3...Insert, 4...Parts. Patent Applicant 5 Fuji Heavy Industries Co., Ltd. Agent Patent Attorney Makoto Kobashi Ukiyo Patent Attorney Susumu Murai Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Form joints on aluminum parts and iron parts,
When the two parts are joined, an intermediate material such as a zinc alloy is inserted into the space left between the two joined parts, and the intermediate material is heated and melted to join the aluminum part and the iron-based part. A method for joining aluminum parts and iron parts.