JPH01312014A - Apparatus for producing irregular section metallic material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a metal material with a modified cross section suitable for structural materials for ships and the like.

[Conventional technology and problems to be solved] Stress is concentrated in the structural materials of ships at the parts where angles, stiffeners, etc. are attached.In order to reduce such stress concentration, only the parts where angles, etc. are attached are thick The use of irregularly shaped steel plates with a larger diameter is being considered.

However, it is extremely difficult to efficiently produce a steel plate with such a cross-sectional shape using a normal rolling method, and even if it were possible, the cost would be extremely high.

The present invention was made in view of these problems, and it is an object of the present invention to provide a method by which a metal material having an arbitrary cross-sectional shape with partially different wall thicknesses can be manufactured efficiently and at a low cost of 1~. be.

[Means to solve the problem]

For this reason, the present invention uses a so-called spray method of molten metal to obtain a metal material with an irregular cross section.The feature of this invention is that the molten metal is atomized into particles by a 71-mizer, and the metal particles are In a method for manufacturing a metal material in which a deposit is formed by depositing on a rotating substrate and the deposits 1- are continuously drawn out from the substrate, metal particles are The purpose is to vary the deposit thickness to obtain deposits with different thicknesses in the longitudinal direction.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the method of the present invention, in which (1) is a tundish for introducing molten metal, (2) is a tundish nozzle, and (3) is a tundish nozzle arranged below the tundish nozzle. The atomizer 1 (4) is a rotating substrate placed below the atomizer 1 (4).

In this embodiment, the atomizer (3) is composed of a pair of gas jet nozzles (5), and is configured to inject a high-speed gas jet stream from both sides of the molten metal stream flowing down from the tundish nozzle (2). has been done.

The substrate (4) has a pair of guide wheels (
It is composed of a rotating belt (6) consisting of a roller or roller) and an endless belt.

In this example, the molten metal in the tundish (1) passes through the tundish nozzle (2), becomes a molten metal flow (M), and falls toward the substrate (4), and on the way, the atomizer ( 3) is atomized into particles. That is, by injecting a high-speed gas jet flow diagonally downward from a pair of gas jet nozzles (5) located on both sides of the molten metal flow (M) and colliding with the molten metal flow (M), the molten metal is atomize into particles.

The metal particles (m) thus formed are deposited on the lower substrate (4) while rapidly solidifying due to convective heat transfer with the high-speed gas, forming a plate-shaped deposit (D). .

Here, the rotation speed of the substrate (4) is changed at a constant cycle, and this causes the substrate (4) to change its rotational speed at a constant cycle.
4) A deposit (D) having different thicknesses in its longitudinal direction is formed on top.

That is, as shown in FIG. 1, a deposit (D) having thick portions (d) at intervals in the longitudinal direction is obtained.

This deposit (D) is the rotating substrate (4)
The material is continuously drawn out from the container and subjected to processing for consolidation and other purposes as necessary.

In this example, in order to narrow down the falling range of the metal particles onto the substrate (4) to a predetermined range and deposit the metal particles with a uniform thickness in the width direction of the substrate, one layer is placed below the atomizer (3). A pair of slit nozzles (7) are provided through which gas is blown onto the stream of metal particles.

FIG. 2 shows another embodiment of the present invention, in which the atomizer (3) is composed of a pair of rotating rolls (8). A pair of rotating rolls (8) are arranged at a predetermined distance, and the molten metal is atomized into particles by flowing a stream of molten metal down this distance.

Each molten metal flow (M) is atomized into particles by the atomizer (3) consisting of this pair of rotating rolls (8).
Form a deposit (D) similar to the figure.

Incidentally, as the substrate (4), a rotating drum (9) as shown in FIG. 3 can be used instead of the rotating belt as in each of the above embodiments.

The present invention can take various other aspects from the basic embodiment as described above, and these will be explained in detail below.

One of them is a mode in which solid metal particles (fine metal powder) are blown into the metal particle forming location or the formed metal particle stream by the atomizer (3).

Fig. 4 shows an example of this, in which solid metal particles (m') are mixed into a high-speed gas jet stream injected from an atomizer (3) consisting of a gas jet nozzle (5'), creating a molten metal mist. It is blown into the place where it is blown. In addition, the blowing of metal particles (m') into such metal particle formation locations is as follows:
It is also possible to use a nozzle or the like provided separately from the atomizer (3). FIG. 5 shows another embodiment,
In contrast to the embodiment shown in FIG. 4, in which fine metal powder was blown simultaneously with atomization, fine metal powder was blown into the formed metal particle flow. That is, a blow nozzle (1o) is provided below the gas jet nozzle (5) which is the atomizer (3), and the metal particle stream (m) formed by the atomizer (3) is introduced into the blow nozzle (1o).
The metal particles (I11') are blown from step 0).

Note that as the means for blowing the metal particles (m'), any means other than a nozzle, such as an impeller device, can be used.

Solid metal particles (m') are blown in as described below.
is usually the same type as molten metal, but when the object of manufacture is an alloy material, for example, particles of a different type of metal than molten metal, or particles of two or more types of metals constituting molten metal. Particles of one or more metals can be injected.

The metal particles (m') thus blown in are heated to a high temperature by the sensible heat of the molten metal, and fall and deposit on the substrate (4) together with the metal particles (m) produced by atomization.

Next, if the object to be manufactured is an alloy material, the metals to be alloyed can be separately flowed down and atomized, and the mixed particles of both metals can be deposited on the substrate.
According to this method, since both metals are mixed in the state of semi-molten metal particles, a uniform mixed state can be obtained without causing gravitational segregation or the like.

Figure 6 shows an example of this, and shows a tongue tissue (
la) (lb) contains melts of different types of metals to be alloyed, and these molten metals pass through tandem nozzles (2a) (2b) into separate streams of molten metal (Ma ) (Mb) flows down and is atomized by the atomizer (3). Simultaneously with this atomization, the particles of both metals are uniformly mixed and are deposited on the substrate (4) below.

In the embodiments shown in FIGS. 4 to 6, a rotating roll (8) as shown in FIG. 2 may be used as the atomizer (3) instead of the gas jet I-nozzle (5).

According to the present invention, by appropriately controlling the substrate, it is possible to obtain a deposit (D) having an appropriate cross-sectional shape, not limited to the cross-sectional shape shown in FIG. 1. Further, by appropriately selecting the shape of the upper surface of the substrate plate (4), it is possible to obtain a deposit (D) having tapers or irregularities on both sides.

Moreover, the irregular cross-section metal material manufactured by the present invention can be applied not only to structural members of ship hulls but also to all kinds of uses.

〔Effect of the invention〕

According to the present invention described above, by adjusting the speed of the substrate, a metal material having an arbitrary cross-sectional shape can be manufactured with high productivity and at a low cost I-.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one implementation situation of the present invention. Second
6 through 6 are explanatory diagrams showing other embodiments of the present invention, respectively. In the figure, (1) is a tundish, (3) is an atomizer, (4) is a substrate, (M) (Ma) (M
b) is the molten metal flow, (m) (m') is the metal particle, (
D) is a deposit. Figure 1 Figure 2 Figure b

Claims (1)

[Claims] A method for manufacturing a metal material in which molten metal is atomized into particles by an atomizer, the metal particles are deposited on a rotating substrate to form a deposit, and the deposit is continuously drawn out from the substrate. A method for manufacturing a metal material with an irregular cross section, characterized in that the deposit thickness of metal particles is changed by changing the rotational speed of a straight, thereby obtaining deposits having different thicknesses in the longitudinal direction.