JPH07280006A - Aluminum alloy disk rotor - Google Patents

Abstract

PURPOSE:To provide a lightweight disk rotor which uses an aluminum alloy as a base and excels in heat resistance and wear resistance. CONSTITUTION:An aluminum alloy having a solidus temperature of not less than 600 deg.C and a high-temperature Vickers hardness of not less than 10 or a composite material in which a ceramic is dispersed in an aluminum alloy matrix is used at least in the sliding part of a disk rotor R. Thereby, it is very useful for a lightweight and light load disk brake in industrial machinery and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy disc rotor, and more particularly to a disc rotor for a lightweight and relatively light load disc brake, which is strongly required in the fields of automobiles, railway vehicles, industrial machines and the like.

[0002]

2. Description of the Related Art Conventionally, cast iron has been the mainstream of disk rotors of this type. However, in order to meet the demand for weight reduction of automobile bodies, it was difficult to significantly reduce the weight of cast iron because the material itself has a large specific gravity. On the other hand, conventionally, an aluminum alloy-based disk rotor made of a composite material mainly composed of an aluminum alloy has been proposed, for example, in JP-A-59-173234 and JP-A-62-124244. Aluminum alloy disc rotors have low high-temperature hardness or low solidus temperature, so the amount of wear at high temperatures increases significantly and some of them melt, resulting in insufficient heat resistance. Met.

[0003]

The present invention has been studied in view of this, and as a result, the solidus temperature is high at least in the sliding surface portion,
Further, by using an aluminum alloy material having a high high temperature hardness or a composite material based on the aluminum alloy, an aluminum alloy disk rotor having extremely excellent heat resistance and wear resistance is provided.

That is, according to the present invention, an aluminum alloy material having a solidus temperature of 600 ° C. or higher and a high temperature Vickers hardness at 500 ° C. of HV10 or higher or a composite material in which ceramic particles are dispersed in an aluminum alloy matrix is used as a disk. It is characterized in that it is used in at least the sliding portion of the rotor.

[0005]

The aluminum alloy having a solidus temperature (T _s ) of 600 ° C. or more and a high temperature Vickers hardness of HV10 or more at 500 ° C. of the present invention is, for example, A as shown in Table 1.
1-8% Fe alloy, Al-15% Fe alloy, Al-18% F
e alloy, Al-8% Mn-2% Cr alloy and the like.

[0006]

[Table 1]

In order to obtain the composite material of the present invention, these alloy powders and ceramic particles such as alumina and silicon carbide are mixed and stirred, and the mixed powder is made into the whole shape of the disk rotor or the sliding portion shape. In order to manufacture, it is filled in a mold and pressure-molded in a hot or semi-melting temperature region where a liquid phase is partially generated. The shape formed by the composite material is cost,
Considering toughness and machinability in the subsequent process, the sliding part shape is preferable, but in the case of a disk rotor that requires extremely severe high temperature characteristics, it is recommended to make the entire shape of the disk rotor with the above composite material. desirable. Further, when the required load is relatively light, it is possible to form the sliding portion shape only with the above aluminum alloy without dispersing the ceramic particles.

In the case of the sliding portion shape product thus obtained, the sliding portion is made of the above-mentioned composite material and the other portion is made of aluminum by casting the aluminum alloy by a method such as a molten metal forging method. An aluminum alloy composite disc rotor made of an alloy is obtained. As another method, an aluminum alloy disc rotor rough shaped material is produced by a method such as molten metal forging method or sheet metal pressing, and the above composite material is placed on the sliding portion thereof and heated and pressed to integrate the aluminum alloy composite material disc. It can also be a rotor. After that, unnecessary parts are removed and a cutting process is performed to complete the product.

[0009]

EXAMPLES Next, examples of the present invention will be described.

As shown in Table 2, Al-8% Fe, Al-
15% Fe, Al-18% Fe and Al-8% Mn-2% C
20 kinds of mixed powders were prepared by mixing four kinds of aluminum alloy powders of r and alumina powder or silicon carbide powder in these alloy powders at different ratios. As a comparative material, the solidus temperature (563 ℃) is low, but the hardness (HV38) at 500 ℃ is high, Al-20% Si-15% Fe, and the solidus temperature (645 ℃) is high, but at 500 ℃. Of two kinds of alloys of A3003 having a low hardness (HV7) and alumina powder or silicon carbide powder in an amount of 20 vol.% Were mixed to prepare six kinds of mixed powders. Next, each powder was put into a die for forming a sliding portion of a disk rotor, and pressure molding was performed in a semi-melting temperature region of each aluminum alloy to produce a sliding portion shaped product (P).

[0011]

[Table 2]

These sliding portion shaped products (P) are set in a molten metal forging die (D) as shown in FIG. 1, and a casting aluminum alloy (AC4C) is placed in the die inner space other than the sliding portion.
(C) was poured and the sliding part shape product (P) was cast around to obtain a disk rotor (R) made of the aluminum alloy material of the present invention, the aluminum alloy composite material and a comparative material. After that, unnecessary parts were removed and cutting was performed to complete 26 types of disk rotors (R). Separately, AC4
Prepare a composite material (C1) in which 20% of silicon carbide is added to C,
After the melting, the entire shape of the disk rotor was manufactured by a molten metal forging method to obtain a comparative material disk rotor (R). Then, these disk rotors (R) were subjected to a friction test under the conditions shown in Table 3.

[0013]

[Table 3]

The results of the friction test are shown in Table 4. The disk rotor made of the material of the present invention has a slight difference in the friction coefficient and the wear amount, but at the high temperature limit (a part of the sliding surface is melted). However, the temperature just before the friction coefficient starts to drop significantly) is more than 520 ° C, and the amount of wear is small, and the heat resistance and wear resistance are significantly higher than those of the comparative disc rotor (especially at high temperatures). Was excellent. On the other hand, the comparative materials with low solidus temperature partially melt at 400 ° C or higher, and those with low high-temperature hardness have wear at 400 ° C or higher and the sliding surface is significantly roughened. It was 440 ° C or lower.

[0015]

[Table 4]

[0016]

As described above, according to the present invention, it is possible to obtain a disc rotor based on an aluminum alloy which has a significantly improved heat resistance as compared with the conventional one and is particularly excellent in wear resistance at a high temperature, and the weight of the disc brake can be reduced. As a result, it has remarkable effects such as being effective in reducing the weight of the vehicle body.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a method for manufacturing a disc rotor of the present invention.

[Explanation of symbols]

 P Sliding part shape product D Molten metal forging die

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Izaki 7-22, Minami-Enkajima, Taisho-ku, Osaka City, Osaka Prefecture Kubota Enkajima Plant, Kubota Corporation (72) Inventor Yoshino, Minami Taisho-ku, Osaka City, Osaka Prefecture 7-12 No. 22 Onkajima Kubota Co., Ltd. Inside the Onkajima factory

Claims (2)

[Claims] 1. An aluminum alloy disk rotor, wherein an aluminum alloy having a solidus temperature of 600 ° C. or higher and a high temperature Vickers hardness at 500 ° C. of HV10 or higher is used in at least a sliding portion of the disk rotor. 2. A composite material comprising ceramic particles dispersed in an aluminum alloy matrix having a solidus temperature of 600 ° C. or higher and a high temperature Vickers hardness of HV10 or higher at 500 ° C. of at least a sliding portion of a disk rotor. The aluminum alloy disc rotor characterized in that