JPH04331829A - Disc rotor - Google Patents

Abstract

PURPOSE:To provide a lightweight disc rotor having high strength which possesses the equal frictional characteristic to that in the conventional by utilizing the semifused joint, as for the disc rotor used for a disc brake for automobile, vehicle, industrial machine, etc. CONSTITUTION:A slidable surface 2 is made of common casted iron material, and other parts are made of spherical graphite casted iron or aluminium alloy material, and these materials are combined, and both are pressing-joined in a semifused temperature region by a metal mold 4. Since the slidable surface 2 is made of common casted iron, the superior frictional characteristic can be obtained, and when other parts are made of the spherical graphite casted iron, high strength is secured, while in case of aluminium alloy, light weight can be secured.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc rotor used in disc brakes used in the fields of automobiles, vehicles, industrial machinery, etc.

0002

[Prior Art and Problems to be Solved by the Invention] Conventionally, such a disc rotor has been made entirely of ordinary cast iron (F
There are FC integral rotors manufactured by C), aluminum rotors manufactured from aluminum alloys, and rotors whose sliding surfaces are made of ordinary cast iron and which are then cast with a different metal. However, each of the conventional rotors described above has the following problems. In other words, FC integral rotors have excellent frictional properties but are heavy and low in strength, aluminum rotors are lightweight but have poor frictional properties and high-temperature strength, and cast-in rotors have poor reliability in joints. .

0003

[Means for Solving the Problems] In view of this, and as a result of various studies, the present invention has developed a disk rotor that has good joints, excellent friction characteristics, and is also high in strength and lightweight.

That is, the present invention uses ordinary cast iron members for the sliding surfaces and spheroidal graphite cast iron or aluminum alloy members for the other parts, combines them, and pressurizes and joins the two in a semi-melting temperature range. It is characterized by this.

[0005]

[Operation] To explain the present invention in more detail, as shown in FIG. 1, the material (1) having a substantially disc rotor shape is made of spheroidal graphite cast iron (FCD) or aluminum alloy. The sliding surface member (2) of the disc rotor is made of ordinary cast iron (FC).
). When the material (1) is an aluminum alloy, it is desirable to apply a treatment such as Zn or Ni plating to the surface of the sliding surface member in order to obtain better bonding.

Next, the above-mentioned molded material (1) and sliding surface member (2)
) and after cleaning etc. as necessary, combine both parts (1
) Heating one or both of (2) to a semi-melting temperature range and maintaining it at that temperature. At this time, in order to prevent oxidation of the joint surfaces of both parts, it is preferable to heat them in a vacuum furnace or an atmospheric furnace, but since this is not advantageous from a practical point of view, a simple method is to heat both parts as shown in Figure 1. It is effective to apply brazing flux (3) to the outer periphery of the joint surface.

The above-mentioned assembled product is placed in a preheated mold (4) as shown in FIG. 2, and pressurized by upper and lower punches (5) and (6). By doing so, both members are reliably and firmly joined at the joint.

[0008] Thereafter, machining, heat treatment, etc. are performed as required in the conventional manner to obtain a disc rotor product.

[0009]

[Example] Next, an example of the present invention will be described. (Example 1) According to the above manufacturing method, first, the sliding surface member (2) in Fig. 1 was made into FC20, and other molded materials (1)
was produced using FCD45. Next, both members were assembled, and a brazing flux (3) was applied to the outer periphery of the joint surfaces of both members, and this was heated and maintained at the semi-melting temperature of both members in a high frequency induction heating furnace. Thereafter, the above-mentioned assembled product was placed in a preheated mold (4) and pressed to join. After that, annealing and machining were performed to obtain the product. Although the frictional characteristics of the thus obtained disc rotor of the present invention were as good as those of the conventional FC integral rotor, the strength of the rotor was approximately twice as high. Furthermore, the joint surfaces were in good condition, and the average joint strength was 19.7 kgf/mm2, which was at the same level as the strength of the base material.

(Example 2) Next, the sliding surface member (2) of FIG.
was made of FC20 and plated with Ni on the surface, and the other material (1) was made of AC4C, which is an aluminum alloy. Then, the two parts are assembled, a brazing flux (3) is applied to the outer periphery of their joint surfaces, and heated in a high frequency induction heating furnace to a half-melting temperature range of AC4C of the formed material (1).
held. The mold (4) in which the above combination was then preheated
It was placed inside the building and was pressurized and bonded. After that, machining was performed to obtain a product. The frictional characteristics of the thus obtained disc rotor of the present invention were as good as those of the conventional FC integral rotor, and in addition, the weight could be reduced by about 30%. Furthermore, the joint surface is in good condition, and the joint strength is 7.2 kgf/mm2.
It was very expensive.

[0011]

[Effects of the Invention] As described above, according to the disc rotor of the present invention, since the sliding surface is made of ordinary cast iron like conventional rotors, it has excellent frictional properties, and the other parts are made of spheroidal graphite cast iron, which has high strength. In the case of aluminum alloy, it has advantages such as being lightweight.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a state in which a formed material and a sliding surface member are combined in the present invention.

FIG. 2 is a side sectional view showing a state in which the assembled product is placed in a mold and pressurized in the present invention.

[Explanation of symbols]

1. Materials 2 Sliding surface member 3. Flux for brazing 4 Mold 5 Upper punch 6 Lower punch

Claims (1)

[Claims] [Claim 1] It is characterized by using ordinary cast iron members for the sliding surfaces, using spheroidal graphite cast iron or aluminum alloy members for the other parts, combining these, and joining them together under pressure in a semi-melting temperature range. disc rotor.