JPS59150602A - Manufacture of composite metallic material - Google Patents

Abstract

PURPOSE:To manufacture inexpensively and in bulk a composite metallic material having high adhesiveness by charging a molten metal onto a metallic plate provided with a weir to the outer circumference and hot rolling the joined metals after solidifying them. CONSTITUTION:A metallic plate 1 provided with a weir 2 to its vicinity or circumference is laid with its joining surface 7 upward on a surface platen 6 of a casting mold 4, and a molten metal 5 is cast on the joining surface of the plate 1 in the weir 4 while keeping the circumference of the plate 1 in an non- oxidizing atmosphere as occasion demands. The molten metal 5 solidifies with time, and a composite metal piece is obtained. In this way, the surfaces of the plate 1 and the metal 5 are joined together in a perfectly sealed state while melting a part of or the whole of the metallic frame to seal the circumference of the joining surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a composite metal material by combining dissimilar metals. The purpose is to provide a manufacturing method.

Conventional joining methods for composite metal materials include a method of sealing the joining surfaces of metal plates to be composited and joining by welding, a method of joining by explosion bonding, a method of joining by an interlayer method, etc. None of these methods are cheap and can be mass-produced.

In addition to the above-mentioned method, there is a method for joining composite metal materials in which molten metal is poured into a mold by placing a metal plate in a mold, but with this method, it takes time for the level of the molten metal to rise. As a result, the metal plates are easily oxidized, and inclusions, scum, etc. in the molten metal may stay on the bonding surfaces of the metal plates, reducing the bonding strength and potentially causing peeling.

Composite metal materials are used to bring out the strengths of two materials to be combined, so if they could be manufactured cheaply and in large quantities, their applications and range of use would rapidly expand. As such technology has not yet been discovered, the reality is that it is currently only used for extremely special parts.

Therefore, the present invention is a method for manufacturing a composite metal material including a method for joining metal plates that can be mass-produced at low cost and has a strong composite adhesive force. This method of manufacturing a composite metal material is characterized in that a metal plate provided with a weir is placed in a mold, molten metal is poured into the mold, and the solidified composite metal piece is hot rolled.

The method of the present invention will be explained in detail below with reference to the drawings.

FIG. 1, FIG. 2, and FIG. 3 are diagrams for explaining the method of joining composite metal pieces in the present invention.

In these figures, reference numeral 1 denotes a metal plate to which other metals are to be joined, and on the outer periphery of the joining side 7 of the metal plate 1 or in its vicinity, there is a mortar to prevent the outflow of molten metal, as shown in Figure 1.2. A metal frame 2 that acts as a weir, or a notched groove 3 that traps molten metal and acts as a weir for the molten metal, as shown in FIG. 3, is provided.

The joint surface of the metal plate 1 is made of Ni, O, etc. in order to make the joint surface difficult to oxidize and at the same time to suppress the diffusion of elements such as 0.
It is preferable to coat with an oxidation-resistant metal such as r, Ou, etc.

In FIG. 2, 4 is a mold, 5 is molten metal poured into the mold, and 6 is a surface plate.

In the method of the present invention, as shown in FIG.
is placed horizontally on the surface plate 6 in the mold 4, and if necessary, while maintaining the surroundings of the metal plate 1 in a non-oxidizing atmosphere (including vacuum), molten metal is placed on the joint surface of the metal plate 1 of the base circle. Cast 5.

Over time, the molten metal solidifies, forming a composite metal piece.

After pouring a desired amount of molten metal into the mold 4, 7 racks for heat retention, heat generation, etc. may be placed as necessary.

Since the metal plate 1 and the molten metal 5 are joined in this way, when the metal frame 2 is used, part or all of the metal frame melts while the four circumferences of the joint surface of the metal plate 1 and the molten metal 5 are melted. In the case of notched groove 3, the molten metal flows into the notched groove and seals the four circumferences of the joint surface surrounded by the notched groove, so that the joint surface is completely sealed and joined. be done.

In addition, since the metal plate 1 is placed horizontally at the bottom of the mold 4 with the joint surface 7 facing upward, the joint surface is immediately covered with molten metal, so there is almost no chance of the joint surface being oxidized, and there is no scum of the molten metal. etc. do not float and adhere to the bonding surface, resulting in a strong bond.

The composite metal pieces joined by the above method are heated to a temperature suitable for processing and subjected to hot processing (e.g. rolling, forging) or further cold rolling or heat treatment, as is generally done. The plate-shaped object a is formed into a composite metal material of another shape.

According to the above-mentioned method of the present invention, since molten metal is poured with the joint surface facing upward, oxidation of the joint surface hardly progresses, scum etc. do not adhere to the joint surface, and the outer periphery or outer periphery of the joint surface is prevented. Since a weir was provided nearby, the four peripheries of the joint surface were sealed, and a strong joint was thereby obtained. Furthermore, according to the method of the present invention, a metal plate with a weir on or near the outer periphery is simply placed horizontally in a mold and molten metal is injected, so mass production is easy and the equipment is simple. , the working time is short, the work is easy, and the cost is low.

A, B, 0. of Example Table-1. A metal plate (thickness: 20 cm) having a weir in the shape of D and made of the material shown in Table 1 was placed at the bottom of the mold with the joint surface facing upward, and 8M50% molten steel was poured into the mold. After pouring, a heat insulating material was placed on the surface of the hot water. The composite metal piece thus obtained was heated to 1000°C and hot rolled. The defect rate of each of the composite metal materials manufactured in this way was measured by UST.

A, B, 0 in Table-1. D is an example of the method of the present invention, E is a comparative example, A, B, O, D-1' are U8T
The defect rate was 0 or 0.5, which was significantly better than 20 for E.

[Brief explanation of drawings]

Figure 1.3 is an explanatory diagram of the weir of the metal plate of the present invention, notched groove (weir), 4... mold, 5... molten metal, 7
...joint surface. Agent: Patent attorney Masamitsu Akizawa and 2 others

Claims (1)

[Claims] (1) A composite method characterized by placing a metal plate with a weir on the outer periphery or near the outer periphery with the joint surface facing upward in a mold, pouring molten metal into it, and hot rolling the solidified composite metal piece. Manufacturing method of metal materials.