JPH0839228A - Disk rotor of aluminum matrix composite material - Google Patents

Abstract

PURPOSE:To improve joining condition at the boundary between composite material and aluminum alloy in the disk rotor in which the sliding surface of aluminum matrix composite material is cast in with aluminum alloy. CONSTITUTION:In the disk rotor of aluminum matrix composite material, in which the sliding part of made of the composite material consisting of aluminum alloy powder and ceramic particle, is cast in with aluminum alloy, the boundary part to be cast in of sliding surface part is cast in by using the aluminum alloy powder, the surface of which is subjected to plating treatment. By this method, the disk rotor having improved joining condition of the sliding surface part is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum-based composite disc rotor for a relatively light load disc brake used in the fields of automobiles, railway vehicles, industrial machinery and the like.

[0002]

2. Description of the Related Art Conventionally, as a disc rotor of a disc brake for light load, there has been a disc rotor made entirely of an aluminum-based composite material, for example. However, since such a disc rotor has poor castability, casting defects may occur, machinability may be poor,
There were problems such as poor toughness. Therefore, in order to avoid such a problem, there has been proposed an aluminum-based composite material in which the sliding surface portion of the disk rotor is made of an aluminum-based composite material, and the sliding surface portion is cast with an aluminum alloy that constitutes the other parts. However, it was difficult to obtain a sufficiently strong joint strength at the interface between the composite material of the sliding surface portion and the cast aluminum alloy.

[0003]

DISCLOSURE OF THE INVENTION In view of this, the present invention has developed an aluminum-based composite disk rotor having improved bonding strength at the interface between the composite material and an aluminum alloy.

That is, the present invention relates to an aluminum-based composite material disk rotor in which a sliding surface portion made of a composite material of aluminum alloy powder and ceramic particles is cast with an aluminum alloy, and the sliding surface portion has a cast-girth interface portion. It is characterized in that it is casted using an aluminum alloy powder whose surface is plated. At this time, it is desirable in terms of cost that the amount of the aluminum alloy powder plated on the surface is 5 to 30 wt% of the aluminum alloy powder used for the sliding surface portion.

[0005]

As described above, according to the present invention, the plated aluminum alloy powder is arranged on the side of the cast-girth interface of the sliding surface part to be cast-molded, so that excellent bonding with the cast-glazed aluminum alloy is achieved. The state is obtained.

Next, a method for manufacturing the disk rotor of the present invention will be described. 2 to aluminum alloy powder which is not plated to make sliding surface made of aluminum composite
A mixed powder A in which ceramic particles such as ˜50% of alumina particles and silicon carbide particles are added and mixed and an aluminum alloy powder B which has been surface-treated by nickel plating or the like are prepared.

The mixed powder A and the surface-treated powder B are charged into a sliding surface molding die. At this time, the mixed powder A is arranged at the position of the sliding surface in the die, and the surface-treated powder B is arranged at the position opposite to the sliding surface, that is, at the position of the interface between the cast and stuff. The amount of the powder B is preferably 5 to 30% of the amount of the mixed powder A in terms of cost.

The powder thus charged into the mold is heated together with the mold to a temperature near the solidus temperature of the aluminum alloy of the powder and held, and then pressure-molded to form the composite sliding surface part C. obtain. At this time, in order to avoid shortening the life of the mold by heating the mold to the molding temperature, the preform formed by pressure molding the raw material powder at a low temperature is heated to the molding temperature and then charged into the mold. A pressure molding method may be used.

Next, the sliding surface component C obtained in this way
After being preheated, it is set in a molten metal forging die for cast gurney, and the aluminum alloy molten metal is poured into the die and pressurized to obtain a composite cast gurney rotor. After that, a disk rotor product is obtained through processes such as cutting as in the conventional method.

[0010]

EXAMPLES The present invention will be described in more detail below with reference to examples.

(Example) First, a sliding surface portion was prepared as follows. A mixed powder A prepared by adding 30% of alumina powder to 8% Fe-Al alloy powder and mixing it, and a powder B obtained by subjecting the 8% Fe-Al alloy powder to chemical nickel plating were prepared.
The mixed powder A and the powder B are formed into a two-layered form as shown in FIG. 1 and charged into a sliding surface molding die (1). The weight ratio of the powder B and the mixed powder A at this time was 1: 4. In the figure, (2) shows an upper punch, (3) shows a lower punch, and (4) shows a die.

As shown in FIG. 1, the mold (1) charged with each powder is heated to a temperature at which a liquid phase partially forms in these powders, held and pressure-molded to form a composite material sliding surface part C. Was produced. After preheating this sliding part C to 450 ° C,
As shown in FIG. 2, it has a movable die (7) and a fixed die (8) supported by support plates (10) (10), and a pressure cylinder (6) is provided on one side of the support plate (10). Set the mixed powder A side to the sliding surface side, that is, to the outside, and the plating powder B side to the casting gurney interface side, that is, to the inside, on the sliding surface portion in the molten metal forging die for cast iron (5), Aluminum alloy for casting (AC4
The molten metal D of C) was poured into the mold (5) by a pressure punch (9) and pressurized, and the sliding surface parts were cast by AC4C to obtain a composite cast-in rotor R. . Thereafter, the rotor R was subjected to steps such as cutting in the same manner as in the prior art to obtain the disk rotor product of the present invention.

The obtained disk rotor of the present invention has a better joining condition at the cast-girth interface than a disk rotor having a sliding surface composed only of a composite material of 8% Fe-Al alloy and 30% alumina particles. It was

[0014]

As described above, according to the present invention, the joining state of the sliding surface portion made of the aluminum-based composite material of the disc rotor for the disc brake is improved, so that the disc rotor having excellent durability can be obtained. It has a great effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a sliding surface molding die.

FIG. 2 is an explanatory view showing a molten-metal forging die for a cast bean.

[Explanation of symbols]

 1 Mold for Sliding Surface Forming 2 Upper Punch 3 Lower Punch 4 Die 5 Molten Forging Die 6 Pressurizing Cylinder 7 Movable Die 8 Fixed Die 9 Pressurizing Punch 10 Support Plate 11 Melt Sleeve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B22F 3/02 F16D 65/12 E

Claims (2)

[Claims] 1. An aluminum-based composite material disk rotor comprising a sliding surface made of a composite material of aluminum alloy powder and ceramic particles, which is formed by casting with an aluminum alloy. An aluminum-based composite disc rotor characterized by being cast and cast using a treated aluminum alloy powder. 2. The aluminum-based composite disk rotor according to claim 1, wherein the amount of the aluminum alloy powder plated on the surface is 5 to 30 wt% of the aluminum alloy powder used for the sliding surface portion.