JPS59183963A - Centrifugal casting method - Google Patents

Abstract

PURPOSE:To obtain a composite cylindrical member having good adhesiveness in the stage of superposing plural layers of different materials and casting centrifugally a cylindrical member by casting the material of the next layer while the outermost layer is half molten. CONSTITUTION:A molten metal to be formed as the outermost layer is cast into a casting mold of a centrifugal casting machine, and while the molten metal is in the half-molten state just prior to solidification under the application of centrifugal force, the molten metal of the next different material is cast in the mold and is solidified in the state of adhering tightly the boundary part between the inside and the outside. The operation is otherwise carried out continuously by as much as desired layers. The cylindrical member which is superposed with plural layers of >=2 kinds of different materials in a combination of, for example, a strength member and a corrosion resistant member and has excellent quality is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an inexpensive and lightweight cylindrical member by laminating two or more layers of different materials using a centrifugal casting method and making use of the characteristic sound of each member.

The primary coolant tube of the atomic couplant is a cast 18-8 stainless steel tube, which is very expensive. In addition, the walls are thick to provide pressure resistance, which is another factor that increases the price.

The present invention attempts to satisfy the intended use by laminating multiple layers of different materials and skillfully combining the characteristics of each material. As a result, the total wall thickness is reduced, the overall weight is reduced, and the portions made of expensive materials are minimized to obtain a cheaper component.

That is, in manufacturing a cylindrical member by stacking two or more layers of different materials using a centrifugal casting method, the material for the outermost layer is first placed in a centrifugal casting machine and cast.
This invention relates to a centrifugal casting method characterized in that when the material is in a semi-molten state, a material for the next layer is poured and cast, and this operation is performed only for the desired layer.

The non-inventive method uses atomic car secondary coolant pipes, grains, cement,
It can be applied to the manufacture of pipes for transporting powder such as coal and iron ore, pipes for water supply, pipes for sewage, pipes for transporting muddy water, etc.

Hereinafter, the non-inventive method will be described in detail with reference to the accompanying drawings.

A known centrifugal casting machine is used, for example, as shown in FIG. 1(A).

When manufacturing the tube shown in (I3), in the process of manufacturing the outer member shown in 1 in the figure, the material 1 is cast and immediately before it solidifies under the action of centrifugal force (in a semi-molten state, the material 2 is in a semi-molten state). The material is cast and solidified as a whole while maintaining sufficient affinity between 1 and 2 without causing any unfavorable conditions (for example, poor adhesion and peeling) at the inner and outer boundaries.

At this time, in order to ensure that the outer member 1 is in a semi-molten state, the solidification state can be determined by the casting temperature, cooling method, cooling time, etc. of the material. It is possible to grasp the entire condition and know when the inner member 2 is being cast.

In this way, according to the uninvented method, the solidification state of the outer member 1 can be ascertained without stopping the centrifugal casting machine, and the inner material 2 can be cast before the outer material 1 is completely solidified (semi-molten state). Therefore, there may be defects at the boundary (for example, poor adhesion,
It is possible to centrifugally construct a two-layer pipe without producing any noise (from peeling).

Also, outer material + Fi, inner material 2 and purpose? A cylindrical member that can be manufactured using different materials, such as a combination of strength members and corrosion-resistant members, with a thin overall wall thickness, high pressure resistance, and excellent corrosion resistance on the inner surface. etc. can be produced.

Furthermore, it is not limited to the above-mentioned two-layer pipe, but it is also possible to manufacture a multi-layer pipe with three or more layers in the same manner.

Next, examples of material combinations for multilayer pipes that can be manufactured by the uninvented method will be shown.

(1) Atomic car secondary coolant tube: A double tube with an outer member made of chromium molybdenum steel and an inner member made of stainless steel (18-8 series).

(2) A pipe for passing muddy water containing sand grains; the outer member is made of cast iron, and the inner member is a double-layered pipe made of rubber.

(3) Piping used for pneumatic transportation of powder such as grain, cement, coal, iron ore, etc.: Double pipe with outer member made of carbon steel and inner member made of wear-resistant steel.

(4) Water piping; The outer member is cast iron, and the inner member is double lead pipe.

(5) Sewage piping: Double pipe with outer member made of carbon steel and inner member made of 18-Japanese stainless steel.

(6) Piping when rust prevention is required on the outside surface and corrosion resistance on the inside surface; The outer first layer member is made of 8-8 series stainless steel, the second layer member is made of carbon steel, and the inner surface member is made of +8-8 series stainless steel. 5 layer tube.

(7) When flowing an aqueous solution with a strong corrosive atmosphere, the outside of the piping is made of coal seam steel, the innermost layer is made of pure nickel, and the middle layer is made of 18
-7'C5 layer pipe made of 8 series stainless steel.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) are diagrams showing an embodiment of the method of the present invention, with FIG. 1(A) being a sectional view and FIG. 1(B) being a plan view. Sub-agent 1) Meikoku agent - Ryo Hagihara - Figure 1 (B) \ (A)

Claims (1)

[Claims] When manufacturing a cylindrical member using multiple layers of two or more different materials using the centrifugal casting method, the material that will be the outermost layer is first placed in the centrifugal casting machine. A centrifugal casting method characterized in that: when the material is in a semi-molten state, the material for the next layer is added and cast, and this operation is performed only for the desired layer.