JPH09323152A - Precision casting - Google Patents

Abstract

(57) Abstract: When a high temperature material is cast into a double cylindrical container having a length larger than a diameter, the material to be cast is molded and filled in the double cylindrical container. Melting and casting is performed by supporting the double cylinder by itself and melting the double cylinder to prevent deformation of the container due to thermal influence, and casting of the material. SOLUTION: A material to be cast in advance is processed according to the size of the double cylindrical container, and after filling the inside of the container, the container is uniformly heated circumferentially, and a heating position is applied from bottom to top. A casting method in which a material is melted while moving and is filled in a container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for melt casting a material using a double cylindrical container. That is, the casting method of the present invention, when casting a high temperature material into a double cylindrical container having a large length as compared with the diameter, the material to be cast is molded and filled in the double cylindrical container, The present invention relates to a method for casting a material while supporting a double cylinder by itself and melting the double cylinder to prevent deformation of the container due to thermal influence.

[0002]

2. Description of the Related Art Conventionally, when a suitable material such as lead is cast into a double-cylindrical container having an outer cylinder inner diameter and an inner cylinder outer diameter, which are longer than their diameters and have a constant distance, the bending and In order to prevent the deformation of the double cylindrical container due to the effect of heat, the wall thickness of the outer cylinder should be sufficiently thick and the outer diameter of the material should be processed after casting to obtain the required dimensions, or at several places. The method of supporting the outer diameter of the outer cylinder has been taken. In addition, since the inner cylinder has a small diameter, it is likely to be deformed due to heat.Therefore, use the same method as the deformation prevention for the outer cylinder, or use a cored bar made of a different material for the inner diameter of the inner cylinder. A method has been used in which dimensions are fitted and deformation is prevented by the rigidity of the core metal.

As for the casting method, when the molten metal is poured from the upper part, pouring holes are provided at several places in order to avoid a sharp thermal gradient in the circumferential direction, or a substance to be cast in advance is placed in a container. It has been taken a method of filling and then heating and melting and casting.

[0004]

However, it is difficult to machine the inner diameter of the inner cylinder of the double-cylindrical container, and if the wall thickness of the inner cylinder is increased, the inner diameter becomes smaller and the machining becomes more difficult. The reality is whether the inner diameter of the inner cylinder cannot be made too small due to the above problems.

Further, in the method of suppressing the thermal deformation by inserting the core metal into the inner diameter of the inner cylinder, when the double cylindrical container is made of aluminum, the core metal may not be removed due to the thermal deformation. Therefore, when the inner diameter of the inner cylinder is considered to be appropriate and casting is performed without using a core metal, if the melting point is relatively higher than the melting point of aluminum such as lead and cadmium, the aluminum softens and the outer diameter There was a case where the inner cylinder with a small size buckled.

[0006]

According to the present invention, a material to be cast in a double cylindrical container is processed in advance in accordance with the container and inserted into the container, and the container is not heated from the outer periphery, so that the heating position is set. The invention was invented for the purpose of suppressing deformation of the container due to thermal effects by moving and casting.

That is, according to the present invention, when an arbitrary material is cast into a double-cylindrical container having an outer cylinder inner diameter and an inner cylinder outer diameter that are larger in length than the diameter and have a constant distance, the material is preliminarily It is processed into a cylindrical shape according to the size of the container, inserted by dividing the total length into several pieces, and then the container is heated uniformly from the outer circumference in the circumferential direction and in several steps in the vertical direction, and heated sequentially from the bottom. A method of casting by moving the melting position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional view of an embodiment of the present invention. To explain the present embodiment, 1 is an inner cylinder, 2 is an outer cylinder, 3 is a bottom member, 4 is a material to be cast, 5 is an upper stage electric heater, 6 is a middle stage electric heater, and 7 is a lower stage electric heater. Is.
More specifically, the casting material 4 is formed into a ring shape in a double cylindrical container having an appropriate inner and outer diameters and a relatively large length with respect to the inner and outer diameters and fitted with an appropriate gap. Has been inserted into. The electric heater 5 is wound around the outer cylinder of the double cylindrical container in upper, lower, middle, and lower stages, and has a structure for heating independently.

According to such a casting method, the outer cylinder of the double cylinder is made thicker to suppress the deformation of the outer cylinder, and the outer diameter of the inner cylinder is supported by the material to be cast. . That is, as described in the embodiment, the material to be cast is fitted into the double container before the start of casting, and as a result, the outer cylinder is used as a reference with the material itself having a proper gap. Be supported.

The inner and outer cylinders are supported by the unmelted parts of the upper and middle parts of the double container by melting the lower part of the material to be cast first by the lower electric heater, and then the lower part of the electric container. When the heating by the heater is finished and the middle part is heated and melted by the middle electric heater, the inner and outer cylinders are supported by the solidified lower and upper unmelted parts, and the middle electric heater is finished and the upper part is When heating and melting the upper part with an electric heater, the inner and outer cylinders are supported by the solidified lower part and the intermediate part. Hereinafter, the present invention will be described based on examples.

[0011]

Example: Cadmium material 25 cm in height and 3.5 c in outer diameter
m and an inner diameter of 2.5 cm are molded into a ring shape and 3
I made one. The formed ring-shaped casting material is inserted into the double cylindrical container having the structure of the present invention, which is made of an aluminum alloy having a higher melting point than the casting material, in close contact with each other in the upper, middle and lower three stages. did. The outer cylinder of this double cylindrical container had a thickness of 0.73 cm, the inner cylinder had a thickness of 0.32 cm, and the distance between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder was 0.55 cm. there were.

Next, an electric heater provided in the lower stage of the double cylindrical container was energized to heat the ring-shaped casting material inserted in the lower stage to 360 ° C. to melt it. After that, the energization of the lower electric heater was stopped to cool and cure the melt. After the melt in the lower stage is hardened, an electric heater provided in the middle stage of the double cylindrical container is energized to heat the ring-shaped casting material inserted in the middle stage to 360 ° C. to melt it, and then The energization was stopped and the melt was cooled and hardened. After the melt in the middle stage has hardened, the electric heater provided in the upper stage of the double cylindrical container is energized, and the casting material inserted in the upper stage is heated to 360 ° C.
After heating and melting, the power supply to the melt was stopped and the melt was cooled and hardened. As a result, a continuous cylindrical casting product made of lead material was obtained without deforming the shape of the double cylindrical container used for the casting.

[0013]

The present invention thus partially melts the material to be cast and supports the double cylindrical container by the solidified and unmelted portions of the material, resulting in thermal effects of the container. A remarkable effect peculiar to the present invention that the deformation can be suppressed occurs.

[Brief description of drawings]

FIG. 1 is a view showing a vertical cross section of a double cylindrical container of the present invention.

[Explanation of symbols]

1: inner cylinder, 2: outer cylinder, 3: bottom member, 4: material to be cast,
5: Upper electric heater, 6: Middle electric heater, 7: Lower electric heater.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaaki Chiba, Inventor Masahiro Chiba, Shikai, Tokai-mura, Naka-gun, Ibaraki No. 4 Shirane, Tokai Research Institute, Japan Atomic Energy Research Institute (72) Taiji Kikuchi, Tokai-mura, Naka-gun, Ibaraki 4 in Shirahane, Japan 4 Atomic Energy Research Institute, Japan Atomic Energy Research Institute (72) Rokuo Kikuchi, Tokai-mura, Naka-gun, Ibaraki 4 4 Shirahane Shirane, Japan Atomic Energy Research Institute

Claims (1)

[Claims] 1. A method of heating and melting and filling a suitable material into a double cylindrical container connected by flat plates sharing one end, wherein the material to be cast in advance is processed according to the size of the double cylindrical container. A casting method in which this is filled in a container, then the container is uniformly heated in a circumferential shape, and the material is melted and filled in the container while moving the heating position from the bottom to the top.