JPH0318454A - Method and apparatus for casting - 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 [Field of Industrial Application] The present invention relates to a highly productive metal casting method and apparatus. [Prior art and its drawbacks] In the conventional casting method, which is carried out by pouring molten metal into a mold, in order to improve the productivity, it is necessary to increase the cooling rate of the molten metal in the mold, and then pour the metal before casting. The goal is to shorten the time required to remove the product from the mold. To this end, it is common practice to create a cooling water passage in the mold and pass cooling water through this passage to cool the casting surface. In this case, it goes without saying that it is effective to place the cooling water passage as close to the casting surface as possible in order to increase the cooling effect. However, in the conventional casting method using a water-cooled mold as described above, the molten metal poured into the mold always hits the same casting surface of the mold, and if it is used repeatedly, only that casting surface will be locally eroded. As a result, holes leading to the cooling water passages would open, causing cooling water to leak onto the casting surface, causing rapid expansion on contact with molten metal and potentially causing a steam explosion. Additionally, because thermal stress is concentrated in one place, the casting surface tends to deform and water leaks from the seal area. For this reason, it is dangerous to use the same mold for a long period of time, so it has the disadvantage of a short lifespan. In addition, because conventional molds had small pouring ports, it was necessary to use a tundish, and as a result, proper melting could not be achieved. [Object of the Invention] Therefore, the purpose of the casting method and apparatus of the present invention is to improve casting productivity and mold durability. [Means for Achieving the Object] In order to achieve the above object, the casting method of the present invention horizontally supports a flat casting surface having a certain area around which a weir is provided, and also supports the casting surface horizontally. A water-cooled mold with a cooling water passage provided below and a melting furnace with a tap opening facing above the casting surface of the mold are used. A plate-shaped cast product of a constant thickness is formed within the weir by horizontally moving the outlet of the weir so that the casting position of the molten metal changes over time on the casting surface. It is. Also, the casting of the present invention! The J station horizontally supports a melting furnace and a flat casting surface with a certain area surrounded by a weir, which is provided below the tap of the melting furnace, and has a cooling water passage under the casting surface. a water-cooled mold comprising: a means for horizontally moving the casting surface of the mold or the outlet of the melting furnace during pouring; and a means for surrounding the melting furnace and the mold to maintain a vacuum or gas atmosphere inside. It consists of an encircling chamber. [Effect] By changing the casting position of the molten metal during pouring, local erosion of the mold is prevented, local thermal stress concentration on the mold is reduced, and the cooling rate is increased. Additionally, if an enclosed chamber is provided, it is kept in a vacuum or gas atmosphere to prevent oxidation and other deterioration of the molten metal. [Example] Next, an example of the present invention will be explained with reference to the drawings. First, water-cooled mold 1 will be explained. This mold 1 is shown in Fig. 1.
As shown in FIG. 2, it has a disc shape, and a roller 4 is provided at the upper end of a support 3 that is vertically disposed on a base plate 2. An annular rail 6 fixed to the lower surface of the mold l The mold l is supported so as to be rotatable in a horizontal plane by coming into contact with the mold l. A flat casting surface 8 surrounded by a weir 7 is formed on the upper surface of the mold 1, and the casting surface 8 is supported by rollers 4 so as to keep it horizontal at all times. A cooling water passage 9 is formed within the mold 1 so as to be located below the casting surface 8. 10 is a rotating shaft fixed to the center of the lower surface of the mold 1, and 11 is a motor that rotates the mold 1 via the rotating shaft 10. A woodwind 12 is arranged concentrically in the rotating shaft 10. Connecting hoses 14 and 15 connected from each of the wood pipes to the cooling water passage 9 are arranged, and the wood pipes 12 and 13 are arranged around the rotation axis lO regardless of the rotational position of the rotation axis lO.
．． An annular water supply body 16 that is constantly in communication with 13. 17 is fixed on the mounting base l8. Therefore, the water supply hose 19
Water supply body 16, water pipe 12. The cooling water supplied to the cooling water passage 9 through the communication hose 14 is circulated through the cooling water passage 9 and is discharged to the drain hose 20 via the communication hose 15, the water pipe 13, and the water supply body 17, and is discharged from the casting surface 8. can be kept at a low temperature. On the other hand, numeral 30 is a melting furnace for melting metal materials by induction heating, and the melting furnace has a crucible body supported in a tiltable manner by a support shaft 3l. 32 is a lobe that pulls the furnace body when tilting it, and 33 is a tap hole of the furnace body.
The tap 33 is provided above the casting surface 8 of the mold 1 so as to face it. The mold 1 and the melting furnace 30 are provided with an enclosure chamber 3 in which the interior can be kept in a vacuum or an atmosphere of inert gas or the like.
It is located in 4. This surrounding chamber 34 may be used depending on the characteristics such as the activity of the product. However, in this casting device, the pressure inside the surrounding chamber 34 is reduced and the metal material is heated by induction in the melting furnace 30 under vacuum. Dissolve. Then, by driving the motor 1l, the mold 1 is rotated at a low speed of about 2 rpm, and the melting furnace 30 is tilted to pour molten metal onto the casting surface 8 from the tap 33 thereof.

The molten metal poured out from the tap 33 is spread thinly and evenly on the casting surface 8 as the mold 1 rotates.
Since the casting surface 8 is maintained at a low temperature by the cooling water passage 9, the molten metal is cooled in a short time. Let solidify.

At this time, a weir 7 is provided around the casting surface 8 to prevent the molten metal from leaking outside. Then, a disc-shaped plate-shaped cast product having a thickness of about 10 to 100 m is formed on the casting surface 8. This plate-shaped cast product is then finely ground and used as a powder for various powder raw materials. In this embodiment, the mold 1 is disk-shaped and rotated. However, the mold 1 may be rectangular instead of disk-shaped. In that case, the mold 1 is rotated during pouring. Instead of rotation, you can also move it horizontally in a straight line. Although not shown, the mold 1 may be fixed by moving the molten metal pouring spout on the casting surface so that the pouring position changes over time. The casting position may be changed over time throughout the pouring process by relatively moving the molten metal and the molten metal. By spreading the molten metal on the casting surface in this manner, heat can be taken from the molten metal in a short time, and it is possible to prevent only a part of the casting surface from being eroded by contact with the molten metal. [Effects of the Invention] As described above, according to the present invention, it is possible to remove heat from poured molten metal in a short time and solidify it in a short time, so that high-quality plate-shaped cast products can be manufactured with high productivity. In addition, it has beneficial effects such as preventing only a part of the casting surface of the mold from being eroded by contact with molten metal and preventing deformation due to concentration of thermal stress, thereby improving the durability of the mold.

Furthermore, as a result, the mold has a wider mouth than before, which has the advantage of eliminating the need for a tundish or the like.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of a mold, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a longitudinal sectional view of a casting apparatus. 1... Mold, 8... Casting surface, 9... Cooling water passage,
DESCRIPTION OF SYMBOLS 11... Motor, 30... Melting furnace, 33... Tapping port, 34... Surrounding chamber.

Claims (1)

[Claims] 1. A water-cooled mold, which horizontally supports a flat casting surface with a certain area and a weir around it, and a cooling water passage is provided below the casting surface; The melting furnace is equipped with a melting furnace with a tap facing above the casting surface of the mold, and the casting surface of the mold or the tap of the melting furnace can be moved horizontally during the supply of hot water to adjust the casting position of the molten metal. A casting method characterized in that a plate-shaped cast product having a constant thickness is formed within the weir so that the thickness changes over time on the casting surface. 2. Horizontally support a melting furnace and a flat casting surface having a certain area surrounded by a weir and provided below the tap outlet of the melting furnace, and provide a cooling water passage under the casting surface. a water-cooled mold, means for horizontally moving the casting surface of the mold or the outlet of the melting furnace during pouring, and an enclosure that surrounds the melting furnace and the mold and maintains the inside in a vacuum or gas atmosphere. A casting device consisting of a chamber.