JPH02165861A - Production of casting consisting of different material - Google Patents

Abstract

PURPOSE:To integrally produce a casting consisting of partially different materials by using an last foam pattern contg. the component to alloy with a molten metal in a suitable part. CONSTITUTION:The pattern having the same shape as the shape of a disk rotor is produced by sealing a foamed material, such as foamed styrene, into a metallic mold, incorporating a powdery spheroidizing agent to the point in contact with a mounting part 2 and heating and holding the same. A riser, gate part, etc., are adhered and assembled at the time of forming a sliding part 1 and the mounting part 2 by this pattern. Mold coating, drying, setting into a flask, sand charging, and oscillating are then executed in the same manner as the conventional casting method, by which the molten metal corresponding to FC 10 is poured. The molten metal flowing form the side face having the shape of the sliding part 1 of the casting mold fills the pattern of the sliding part 1 and thereafter, the molten metal flows into the pattern of the mounting part 2 and reacts with the spheroidizing agent therein, by which the spheroidized cast iron is formed. The molten metal is thereafter solidified and shaking out, removing of the unnecessary part, etc., are executed. The sliding part is formed of the FC 10 having an excellent friction characteristic and vibration controllability in this way and the mounting part is formed of the FCD having the high strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a cast product made of different materials, and in particular, this invention is realized using an investment casting method.

[Conventional technology]

Conventionally, the methods of combining parts of different materials into a single part include mechanically joining them with bolts and rivets, welding, soldering, etc., or melting the materials of one part. There are methods such as joining by casting.

[Problem to be solved by the invention]

However, all of these methods have drawbacks in the following points.

In other words, in the mechanical joining method, the cost increases significantly due to the increase in the number of man-hours and the number of parts. Welding joints not only increase costs due to increased man-hours, but also tend to cause problems due to defects in the joints. Further, the above-mentioned defects are likely to occur due to the casting, and there are also other problems such as poor interface reliability.

[Means to solve the problem]

In view of this, and as a result of various studies, the present invention has developed a method for manufacturing members made of different materials in one casting process by utilizing the investment casting method.

That is, the present invention provides a method for manufacturing a cast product by making a mold using a vanishing model and pouring molten metal into the mold.
This method is characterized in that a cast product made of partially different materials can be manufactured in one piece by using a vanishing model containing a component that alloys with the molten metal in appropriate parts.

[Effect]

In this way, by using a vanishing model containing components that alloy with the molten metal in appropriate parts, the molten metal can be used as the base metal, and the material of the desired part can be an alloy based on the metal. Therefore, it is effective for obtaining an integral member when the properties required for that part are different from those of the base metal.

In other words, when a part of a member has different required characteristics from other parts due to its structure, for example, a disc rotor, which is a part of a disc brake, is a disc-shaped sliding member that is held between friction materials during braking, as shown in Figure 1. Part (1) and this sliding part (1
) and a mounting part (2) that fixes it to a rotating axle, etc., but this sliding part (1) is preferably made of high carbon ordinary cast iron (FCIO etc.) from the point of view of friction characteristics and vibration damping properties. The mounting part (2) is made of spheroidal graphite cast iron (
FCD50 etc.) are preferred.

When the required characteristics differ in parts like this, it is better to use different materials for each part, but in the past, each part was manufactured separately and then integrated using the above-mentioned joining method, which significantly increased costs. As a result, it was not widely put into practical use.

In the above case, according to the method of the present invention, FCIO is used as a base material and FCIO is used as a base material.
If molten metal equivalent to CIO is used and a spheroidizing agent is included in the vanishing model corresponding to the mounting part (2), a disc rotor with excellent characteristics can be manufactured with one pouring.

Furthermore, the combination of materials used in the present invention is not limited to the above cases (it is applicable to all members made of different materials with the same main components, such as pure Al and Aβ alloys, pure Mg and Mg alloys, and cast iron and cast steel). It is.

〔Example〕

Next, one embodiment of the present invention will be described using the above-mentioned disc rotor.

First, a foaming material such as expanded styrene is sealed in a mold to make a mold having the shape shown in Fig. 1. At the same time, a powdered spheroidizing agent is mixed into the foaming material at the location corresponding to the attachment part (2), and heated. A model with the same shape as the disc rotor was made by holding it. Then, when making the sliding part (1) and the mounting part (2) using this disappearing model, the riser, weir part, etc. were glued and assembled in the same way as in the past.

Next, in the same manner as in the conventional casting method, a mold was applied, dried, set in a flask, sand was added, and the mold was shaken to pour a molten metal equivalent to FCIO.

The molten metal flowing from the side surface of the sliding part (1) shape in Fig. 1 of such a mold fills the model of the sliding part (1), and then flows into the model of the mounting part (2), and the spherical shape therein fills the model of the sliding part (1). This part becomes spheroidized cast iron as it reacts with the curing agent.

Thereafter, it was solidified, and a disc rotor was manufactured through steps such as mold release, removal of unnecessary parts, and shot blasting using conventional methods.

It was confirmed that the sliding part of the disc rotor obtained by one casting process using the method of the present invention is made of FCIO, which has excellent friction and vibration damping properties, and the mounting part is made of FCD, which has high strength. .

〔Effect of the invention〕

As described above, according to the present invention, additives to the molten metal are partially mixed into the disappearing model of the disappearing model casting method, so that only those parts can be made of a different material from other parts during casting, and different characteristics can be obtained. It has significant industrial effects, such as a significant cost reduction when producing a member consisting of the required parts by the casting method, and superior quality due to the high reliability of the interface between different materials.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a disc rotor. ■・・－Sliding part 2.-Mounting part

Claims (1)

[Claims] (1) In a method of manufacturing a cast product by making a mold using a vanishing model and pouring molten metal into it, a vanishing model containing components that alloy with the molten metal is used in appropriate parts to partially A method for manufacturing a cast product made of different materials, characterized by integrally manufacturing cast products made of different materials.