JPS5930465A - Method for embedding ferrous material by casting with aluminum alloy - Google Patents

Abstract

PURPOSE:To obtain a composite material having high bond strength and good heat conductivity by plating metal such as Ni, Cu or the like on the embedding side surface of a ferrous material, die-casting an Al base material, and forming a melt-stuck alloy layer at the boundary between the Al base material and the ferrous material. CONSTITUTION:Metal having good property in melt-sticking such as Ni, Cu or the like is plated on the surface on the embedding side of, for example, a liner 1 made of cast iron in the stage of embedding the liner 1 by casting with a cylinder block 2 of an Al alloy. Thereafter, the liner is set in dies and a molten Al alloy as a cylinder block 2 material is die-cast to embed the liner. The molten Al alloy and the ferrous material cause a diffusion reaction through the plated layer in this stage and both are thoroughly melt-stuck together, thereby forming an alloy layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a casting method for manufacturing a composite profit knife by casting a ferrous material with an aluminum alloy, and in particular a casting method for manufacturing a composite profit knife.
Concerning what Kast does.

For example, in the cylinder block of an internal combustion engine, when a liner made of steel or cast iron with good wear resistance is cast in an aluminum alloy cylinder block, it has been considered to perform this casting by die casting. Generally, when constructing a composite material by such casting, in order to form a composite phase, the two must be completely fused and an alloy layer of aluminum and iron must be formed on this fused surface. It is necessary to be present. However, with the conventional die-casting technology of aluminum alloys,
At present, no alloy layer is formed between the aluminum alloy and iron by fusion, and the conditions for a composite material are not satisfied.

The present invention eliminates the drawbacks of conventional aluminum die-cast cast-in products, and completely fuses aluminum and iron-based materials to form an alloy layer between them, thus creating a strong bond between the two. This was done with the aim of obtaining a compound monthly yield with high strength and good heat conduction between the two.In order to achieve this purpose, in the present invention, iron is added to a part of the aluminum die-cast product. When casting the iron-based material, at least the surface of the cast-in side of the iron-based material is plated with Ni, Cu, etc., an aluminum base material is die-cast, and the aluminum base material and the iron-based material are fused at the interface. It is characterized by forming an alloy layer.

That is, to explain the method of the present invention in more detail, first,
The surface of the iron-based material that is the cast-in base material is coated with a metal that has good fusion properties with the aluminum alloy, such as a plating metal such as Ni or Cu. After that, the ferrous material treated in this way is placed in a mold, and the molten aluminum alloy is cast as a die cast. During such casting, the molten aluminum alloy and the ferrous material are mixed into the plated layer. A diffusion reaction occurs through the process, and the two are completely fused to form an alloy layer.In this way, a composite material with high bonding strength and good heat conduction between the two is created. That's what you get. Next, the present invention will be explained in detail.

Example" First, when casting a cast iron liner ( ) as shown in FIG. 1 into an aluminum alloy cylinder block (2), the cast iron liner (1) was prepared with the component ratios shown in Table 1. Using cast iron, the surface of the cast-in side of the cast iron liner (1) is plated with Ni, and then a molten aluminum alloy equivalent to ADCIO is die-cast into the cylinder block as a filler material to form a boundary layer between the two. I looked into the organization.

Table 1 (H) Figure 2 shows a tomographic photograph of the interface between such an aluminum alloy and a cast iron liner, and in this figure,
The black part at the bottom of the figure shows the cast iron liner, and the strip in the middle shows the cylinder block made of aluminum alloy.
It was confirmed that the linear portion between the aluminum alloy cylinder block material and the plated metal layer was an alloy layer, and that both were completely fused through the alloy layer. In addition,
The thickness of the alloy layer is approximately 1 μm and is uniformly formed over substantially the entire surface.

Example 2 When casting the core material (4) of steel material using the aluminum alloy connecting rod (3) K shown in FIG.
) was used as JIS standard SNC phase 8, and after applying Ni metal plating on its surface, it was set in a mold, and a molten aluminum alloy equivalent to ADC10 was die-cast and cast, and between the two The organization was investigated. Figure 4 is a tomographic photograph of the fused layer between the steel core and the aluminum alloy obtained in this way. is a Ni plated metal layer, and the upper part of the figure is an aluminum alloy layer,
It was confirmed that a linear alloy layer was formed between this aluminum alloy and the plated metal layer, and that they were completely fused. In this case as well, the J-thickness of the alloy layer is approximately 1 micron,
It is made almost uniformly over the entire surface.

As can be understood from the above explanation, according to the cast-in die casting method of the present invention, the iron-based metal and the aluminum alloy are completely fused together through the plated metal layer applied to the surface of the iron-based material.
Since an alloy layer is formed between the two, it is possible to obtain a composite material of aluminum die-casting material and iron-based material with high bonding strength and good thermal conductivity. In addition, in the above example, the case was shown in which the connecting rod and cylinder block of an internal combustion engine were used, but other aluminum die-cast products constituted as such composite feed, such as rocker arms, camshafts, etc. of internal combustion engines, are also applicable. It can be similarly applied to cylinder heads and the like.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a cylinder block showing an embodiment of the present invention, and FIG.
0x micrograph, FIG. 3(A) is an IF view of a connecting rod showing another embodiment of the present invention, FIG. 3 fBl is also a center vertical cross-sectional view, and FIG. This is a 400x microscopic photograph of the interface between an aluminum die-cast connecting rod and a steel 8-hole connecting rod. Hisayuki Tarumoto, Patent Attorney for Diesel Co., Ltd. Figure 4 Figure 2

Claims (1)

[Claims] When casting a ferrous material into a part of an aluminum die-cast product, N is added to at least the surface of the ferrous material on the casting side.
i. Casting of ferrous materials using aluminum alloys, which is characterized by die-casting an aluminum base material with plating metal such as Cu, and forming a fusion alloy layer at the interface between these aluminum base materials and ferrous materials. Method.