JPH0318455A - Melting and casting apparatus - Google Patents

Abstract

PURPOSE:To improve the productivity of plate-like casting product and the durability of a mold by arranging means for relatively shifting the water cooling type mold, molten metal tapping hole and a casting face and means possible to go/come to/from between a surrounding chamber surrounding a melting furnace and the mold and a cooling chamber by opening/ closing air-tightening parting door. CONSTITUTION:The mold 11 is contained in the surrounding chamber 31, and by reducing the pressure in the surrounding chamber 31, the metal material is induction-heated and melted into the melting furnace under vacuum. The mold 11 is rotated at low velocity, and by tilting the melting furnace, the molten metal is poured and spread on the casing face, and as this casting face is held at low temp. with a cooling water passage, the molten metal can be cooled. During pouring the molten metal, the cooling chamber 32 is made to the same vacuum condition as the surrounding chamber 31, the opening/closing door 31 is opened at the time of completing the pouring of molten metal, and the mold 11 is shifted to the cooling chamber 32, and the door 33 is again closed as air-tight. If necessary, inert gas for cooling is supplied into the cooling chamber 32 and the mold is cooled at near the room temp., by opening an inlet/outlet door 41, this mold 11 is taken out on a charging table 43. By this method, the plate-like casting product can be formed. During cooling, the surrounding chamber 31 can be prepared to the next casting and time loss can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for melting and casting metal, and more specifically to a melting and casting apparatus that is highly productive and economical. [Prior art and its problems] In order to prevent oxidation, etc. that occur when molten metal is poured, a melting furnace and a mold are installed in an enclosed chamber with a vacuum or inert gas atmosphere, and the metal is melted in the enclosed chamber. Melting and casting equipment that can perform simultaneous casting has been known for a long time. However, the productivity of conventional melting and casting equipment is currently low due to the reasons mentioned above. (b) Since the mold and the melting furnace are installed in one enclosed chamber, and the cooling rate of the molten metal poured into the mold is slow, it takes time until the mold can be taken out of the enclosed chamber. ．． (b) When taking the mold in and out of the surrounding chamber, outside air enters the surrounding chamber, which may cause oxidation of the molten metal in the melting furnace. New materials cannot be melted in the furnace. (c) Even if the mold has a water-cooled structure to speed up the cooling rate, if the mold is used repeatedly, the part of the casting surface that comes into direct contact with the molten metal during pouring will be locally eroded and the degree of erosion will become deeper. There is a risk that it may connect to the cooling water passage and cause a steam explosion. In addition, even when the erosion was slight, problems such as water leaking from seals occurred due to distortion caused by localized heat loads. Therefore, a water-cooled structure could not be easily adopted.

[Means to solve the problem]

The present invention aims to solve the above problems and provide a melting and casting apparatus capable of casting with high productivity, including a melting furnace,
A water-cooled mold, which horizontally supports a flat casting surface having a certain area surrounded by a weir, which is provided under the outlet of the melting furnace, and has a cooling water passage provided below the casting surface. , means for horizontally moving the casting surface of the mold or the outlet of the melting furnace during pouring, and an enclosure chamber that surrounds the melting furnace and the mold and maintains the inside in a vacuum or gas atmosphere, A cooling chamber capable of holding atmospheric gas is provided adjacent to the surrounding chamber, the mold can be passed between the cooling chamber and the surrounding chamber, and an opening/closing door airtightly partitions the cooling chamber and the surrounding chamber. It is characterized by having the following. [Function] By pouring metal while horizontally moving the spout across the casting surface, the molten metal is spread evenly over the casting surface and a cooling effect can be obtained, and the heat load on the casting surface can be reduced and localized Target erosion can be prevented. Therefore, the cooling rate of molten metal becomes faster and productivity improves. Additionally, if the mold is moved to an adjacent cooling chamber for cooling, new material can be melted in the melting furnace in the surrounding chamber and prepared for the next casting. There is no time loss. [Example] Next, an example of the present invention will be described with reference to the drawings.

The induction heating type melting furnace 1 has an induction coil arranged around the outer periphery of a ceramic crucible-shaped furnace body, and the furnace body is tiltably supported by a support shaft 2. The rope to be pulled during tilting, 4, indicates the outlet of the furnace body. The mold 11 provided under the tap 4 is of a disk shape as shown in FIGS. 3 and 4, and a roller 14 is attached to the upper end of a support 13 suspended above a base plate l2. An annular rail 16 is provided and fixed to the lower surface of the mold l1 to the roller 14.
The mold 1l is supported so as to be rotatable in a horizontal plane by contacting with the mold 1l. The upper surface of the mold 11 is surrounded by a weir 17.
A flat casting surface 18 surrounded by the molding surface 18 is formed, and the casting surface 18 is supported by rollers 14 so as to keep it horizontal at all times. A cooling water passage 19 is formed within the mold 11 so as to be located below the casting surface 18. 20 is a rotating shaft fixed to the center of the lower surface of the mold 1l, and 2l is a motor that rotates the mold 11 at a low speed via the rotating shaft 20. A water pipe 22 is concentrically arranged in the rotating shaft 20. 23 is connected to the cooling water passage 19 from each wooden pipe.
．． 25 is disposed around the rotation shaft 20, and an annular water supply body 26.25 is disposed around the rotation shaft 20, which is always in communication with the water pipes 22 and 23 regardless of the rotational position of the rotation shaft 20. 27 is fixedly mounted on the mounting base 28. Therefore, from the water supply hose 29 to the water supply body 26,
The cooling water supplied to the cooling water passage 19 via the water pipe 22 and the communication hose 24 circulates through the cooling water passage 19, and is circulated through the communication hose 25 and the water pipe 23. Drainage hose 3 via water supply body 27
0 to keep the casting surface 18 at a low temperature.

Reference numeral 31 denotes an enclosure chamber that surrounds the melting furnace 1 and the mold 11 and can maintain the interior in a vacuum or an atmosphere of inert gas or the like.
Further, 32 is a cooling chamber provided adjacent to the surrounding chamber 31. An opening/closing door 33 is provided between the surrounding chamber 31 and the cooling chamber 32 to airtightly partition the compartment. The opening/closing door 33 is provided in a door box 34 formed between the compartments so as to be slidable horizontally in the width direction. Reference numeral 35 designates a chain member disposed on the ceiling of the door box 34 for sliding the opening/closing door 33 and connected to the opening/closing door 33 by a link 36. Also, 37
is a cylinder provided to press the opening/closing door 33 onto the opening of the cooling chamber 32 without any gaps by pushing out the rod 38 to maintain airtightness between the compartments. An entrance/exit 39 is provided on the opposite wall of the cooling chamber 32, and the entrance/exit 39 is provided with an entrance/exit door 41 which can be slid up and down by the operation of a cylinder 40 and can be closed airtight. 43
is a charging table provided outside the entrance/exit 39. The surrounding chamber 31, the cooling chamber 32, and the charging table 43 are provided with a series of roller conveyors 42 for movably supporting the mold 1l, on which the mold 11 is transported from the surrounding chamber 31 to the cooling chamber. 32 or charging table 43.

In the melting and casting apparatus configured in this way, the mold 11
is placed in the surrounding chamber 3L, the pressure inside the surrounding chamber 3L is reduced, and the melting furnace 1 is heated.
The metal material is heated by induction and melted under vacuum. Then, by driving the motor 21, the mold 11 is rotated at a low speed of about 2 rpm, and the melting furnace 1 is tilted to pour molten metal onto the casting surface l8 from the tap 4. Hot water outlet 4
The molten metal poured out is spread thinly and evenly on the casting surface l8 as the mold l1 rotates. Since the casting surface l8 is maintained at a low temperature by the cooling water passage 19, the molten metal can be cooled. At this time, a weir 17 is provided around the casting surface 18 to prevent molten metal from leaking outside the casting surface 18. During this pouring, the cooling chamber 32 is kept in the same vacuum state as the surrounding chamber 31, and when the pouring is finished, the opening/closing door 33 is opened, the mold 1l is moved to the cooling chamber 32, and the opening/closing door 33 is airtightly closed again. And cooling room 3
After the mold 11 is cooled down to near room temperature by supplying cooling inert gas or forced circulation as necessary in the mold 2, the entrance/exit door 41 is opened and the mold 11 is taken out onto the charging table 43. This results in a thickness of 10 to 100 m on the casting surface l8.
The cast product can be made into a disk-shaped plate of about 100 mL, and the cast product can be used as it is or as a powder after being pulverized into a powder for various powder materials. During this cooling, new metal material can be introduced into the melting furnace L in the surrounding chamber 3L and melted in preparation for the next casting. That is, since the surrounding chamber 3l can be maintained in a vacuum state regardless of the condition of the cooling chamber 32, the next material can be melted during that time. and charging table 43
After taking out the cast product, the mold 11 is moved to the cooling chamber 32, and the inside of the cooling chamber 32 is brought into the same vacuum state as the surrounding chamber 31, and then the opening/closing door 33 is opened and the mold 1l is moved to the surrounding chamber 31, and the mold 1l is moved to the surrounding chamber 31, and then In the same way as above, pour the metal from tap 4 onto the casting surface one day above.
By repeating the same process, plate-shaped cast products can be mass-produced. In this embodiment, the mold 11 is disk-shaped and rotated. However, the mold 11 may be rectangular instead of disk-shaped. In that case, the mold 1l is rotated during pouring. Instead of rotation, you can also move it horizontally in a straight line. Furthermore, although not shown, the mold 1l may be fixed by moving the molten metal pouring spout on the casting surface so that its 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. Although not shown, productivity can be further improved by adding more cooling chambers. (Effects of the Invention) As described above, according to the melting and casting method of the present invention, the molten metal melted in the surrounding chamber maintained in a vacuum or gas atmosphere is poured from the outlet onto the casting surface of the mold at a casting position over time. By pouring the metal while changing the temperature, it is possible to remove heat from the molten metal in a short time and solidify it. This improves the durability of the mold by preventing only a portion of the casting surface from being eroded by contact with molten metal. In addition, since the mold can be cooled by moving it to the adjacent cooling chamber, the next material can be melted in the melting furnace in the surrounding chamber during that time, allowing cooling and melting to proceed simultaneously. This has beneficial effects such as eliminating wasted time and improving productivity.

[Brief explanation of drawings]

The drawings show an embodiment of the melting and casting apparatus according to the present invention, and FIG. 1 is a longitudinal cross-sectional view, and FIG. 2 is a cross-sectional view of FIG. j
3 is a perspective view of the mold, and FIG. 4 is a vertical sectional view of FIG. 3. 1... Melting furnace, 4... Tap, 1l... Mold, l
8... Casting surface, 19... Cooling water passage, 31... Surrounding chamber, 32... Cooling chamber, 33... Opening/closing door.

Claims (1)

[Claims] A melting furnace, horizontally supporting a flat casting surface having a certain area and surrounded by a weir, which is provided below the outlet of the melting furnace, and providing 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 chamber that surrounds the melting furnace and the mold and maintains a vacuum or gas atmosphere inside. A cooling chamber whose interior can be kept in atmospheric gas is provided adjacent to the surrounding chamber, the mold can be moved back and forth between the cooling chamber and the surrounding chamber, and the cooling chamber and the surrounding chamber are airtight. A melting and casting device characterized by being provided with an opening/closing door for partitioning.