JPH0317493A - Vacuum induction fusion furnace - Google Patents

Abstract

PURPOSE:To improve safety of operation to make crucible exchange work easy so as to improve productivity by allowing a vertical plate to airtightly block an opening when a truck is put in a vacuum chamber to detachably mount an electricity supply water feed and drain pipe to a power source and a water feed and drain source in the outside of the vertical plate. CONSTITUTION:When a truck 2 is put in a vacuum chamber 1, a vertical plate 18 is fitted in an opening 6 from the inside thereof to insert a tightening bolt 22 in a hole of a clamp member 12 so as to tighten a nut 25 on the outside thereof, so that by pulling the bolt 22 outward to pull the vertical plate 18 outward, the vertical plate 18 is airtightly pressure-fitted in the circumference of the opening 6 to block the opening 6. A vacuum pump is operated to reduce the pressure of the vacuum chamber 1 to connect an electricity supply connector 23 and a water feed connector 24 to a power source and a water feed and drain source 27 respectively to supply an induction heat coil 17 with electricity so as to dissolve a metal material of a crucible 16. When the crucible 16 is exchanged, the other crucible is put on the other truck to put in the vacuum chamber 1 to block the opening 16 with the use of the vertical plate so as to complete exchange work in a short time if the power source 26 and the water feed drain source 27 are connected to the electricity supply and water feed drain pipe, and the next dissolution can be started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum induction melting furnace comprising a crucible for melting metal by induction heating in a vacuum chamber. [Prior art and its problems] A vacuum induction melting furnace is a method in which a metal material such as steel is placed in a crucible whose peripheral wall is equipped with an induction heating coil, and the material is melted by induction heating in a vacuum. As is well known, it is often necessary to periodically repair the crucible in the vacuum chamber or replace the crucible due to changes in steel type, etc., but in conventional vacuum induction melting furnaces, the crucible cannot be replaced. It took a lot of effort to replace it, and it was difficult to replace it in a short time. That is, when replacing a crucible, a worker had to enter the vacuum chamber and unfit and unfit the connection points of the power supply and drain pipes that supply power to the induction heating coil on the peripheral wall and circulate cooling water. The room is very small, making it difficult to work, and connections tend to be incomplete.
If the connection was incomplete, there were problems such as poor electrical conduction within the vacuum chamber or water leakage, which could lead to serious accidents. (Means for Solving the Problems 3) The present invention attempts to solve the above problems, and includes mounting a crucible equipped with an induction heating coil on a truck, and fixing a vertical plate to the truck, and A power supply/drainage pipe for supplying power to the heating coil and circulating cooling water is inserted through the vertical plate,
An opening is provided in the side wall of the vacuum chamber into which the trolley can be inserted, so that the vertical plate can airtightly close the opening when the trolley is inserted into the vacuum chamber, and the power supply and drainage are connected to the outside of the vertical plate. The pipe is designed to be detachably connected to a power source and water supply and drainage source. [Example] Next, an example of the present invention will be described with reference to the drawings.

This embodiment uses vacuum casting equipment (also referred to as CLV method) in which molten metal in a crucible is sucked into a mold by a pressure difference.
This vacuum #p: is applied to the induction melting furnace. FIG. 1 shows a vacuum chamber 1, and FIG. 2 shows a cart 2 inserted into the vacuum chamber 1. The vacuum chamber 1 is provided with an opening/closing door rR3 on one side, and by opening the opening/closing door 3, the trolley 2 can be loaded as shown in FIGS. 3 to 6. 4 is a casting chamber formed above the vacuum chamber l; 5 is the casting chamber 4;
The air-permeable mold 29 set inside is a partition door that partitions the vacuum chamber 1 and the casting chamber 4. A circular opening 6 is formed in the side wall of the vacuum chamber 1, and a clamp member 12 is pivotally attached to the outer peripheral edge of the opening 6. Furthermore, parallel rails 7, 7 on which the trolley 2 can run are laid at the bottom of the vacuum chamber 1. In addition, an assembly frame 8 is formed on the underside of the bottom wall of the vacuum chamber l.
A cylinder 9 is vertically disposed on the piston rod of the cylinder 9, and an elevating rod 10 whose upper end projects into the vacuum chamber l is provided, and a riding plate 11 is horizontally fixed to the elevating rod lO. On the other hand, the trolley 2 having the carriage 14 has an opening 15 in the center thereof through which the board 11 can pass, and a crucible 16 can be mounted on the opening 15.
Reference numeral 17 denotes an induction heating coil wound around the outer periphery of the crucible 16, and the induction heating coil 7 is made of a hollow conducting wire so that cooling water can flow inside. Reference numeral 18 denotes a circular vertical plate vertically fixed to the front part of the truck 2 by a mounting frame 19, and the vertical plate 18 has a flexible power supply/drainage system for supplying power to the induction heating coil 17 and circulating cooling water. tube 2
0 is inserted. 21 is the corresponding salary T! 1 This is a bush provided in the penetration part of the water supply and drainage pipe 20 to maintain airtightness.

Further, the vertical plate 18 has a size that matches the opening 6 and airtightly closes the opening 6 from the inside, and a tightening bolt 22 protrudes from the outer surface near the peripheral edge of the vertical plate 18. It is planted to do so. A connector 23 for power supply and a connector 24 for water supply and drainage are provided at the tip of the power supply and drainage pipe 20. In the vacuum induction melting furnace configured in this way, when the cart 2 is inserted into the vacuum chamber l, the vertical plate l8 is joined to the opening 6 from the inside, and the tightening bolt 22 is inserted into the hole of the clamp member 12. By screwing the nut 25 on the outside of the clamp member l2, the bolt 22 is pulled outward, and the vertical plate 18 is hermetically crimped to the periphery of the opening 6 by pulling the vertical plate 18 outward. occlude. Then, a vacuum pump (not shown) is operated to reduce the pressure in the vacuum chamber 1, and the power supply connector 23 and water supply connector 24 are connected to the power supply 26 and water supply/drainage #27, respectively, and the induction heating coil 17 is energized. melt the metal material in the crucible 16. Then, the cylinder 9 is actuated to raise the board 11 and the crucible 16 is raised in the vacuum chamber 1, and the vacuum chamber 1 of the mold 5 set in advance in the casting chamber 4 is
The snout 28 hanging down inside is introduced into the crucible 16, and the pressure in the casting chamber 4 is made lower than the pressure in the vacuum chamber 1, so that the molten metal in the crucible 16 is transferred into the mold 5 by the differential pressure. Let it be sucked up and cast. When the casting is finished in this way, the crucible 16 is lowered onto the cart 2 as before and the partition m29 is closed. If casting is to be continued, metal material is added to the crucible 16 using a material charging device (not shown). Therefore, when replacing the crucible 16, the connector 23 for power supply, the connector 24 for water supply
respectively power supply 26. Water supply and drainage - Remove from a27, nut 25
If the clamp member l2 is disengaged from the bolt 22 and the opening/closing door 3 is opened, the cart 2 can be moved and the crucible 16 can be carried out of the vacuum chamber I along the rails 7.7. Then, another crucible is placed on another cart with a similar structure prepared as necessary, and this is inserted into the vacuum chamber 1, and the vertical plate is inserted into the opening 6.
to close the opening 6. Then, the power supply and drainage pipe of the crucible that is led out from the vertical plate is connected to the
By connecting the source 26 and the water supply and drainage source 27, the replacement work can be completed in a short time and the next melting can be started. [Effects of the Invention] As described above, the vacuum induction melting furnace of the present invention has a structure in which the power supply and drainage pipe of the induction heating coil is inserted through the vertical plate provided on the cart, and the opening of the vacuum chamber can be airtightly closed with the vertical plate. By doing so, the power supply and drainage pipe can be connected to the power source and the water supply and drainage source outside the vacuum room, making the connection work easier, and since the connection is made outside, there is no possibility that the connector may have poor continuity or water leakage. Even if this occurs, it can be easily dealt with, and unlike the conventional method of attaching and detaching hoses inside the vacuum chamber, there is no risk of serious abnormalities such as water leakage inside the vacuum chamber. This has the beneficial effect of improving operational safety, making crucible replacement easier, and improving productivity.

[Brief explanation of the drawing]

The drawings show an embodiment of the vacuum induction melting furnace according to the present invention, and FIG. 1 is a vertical cross-sectional view of the vacuum chamber, FIG. 4 is a cross-sectional view of FIG. 3, FIG. 5 is a right side view of FIG. 3, and FIG. 6 is a horizontal sectional view of FIG. 3. 1...Vacuum chamber, 2...Dolly, 3...Opening/closing door, 6...
... Opening, 12... Clamp member, 16... Crucible, l7... Induction heating coil, 18... Vertical plate, 20
...Power supply and drainage pipe, 22...Volt, 23...Connector for power supply, 24...Connector for water supply, 26.
...Power supply, 27... Water supply and drainage source. ~ 25

Claims (1)

[Claims] A crucible equipped with an induction heating coil is mounted on a truck, and a vertical plate is fixed to the truck, and a power supply/drainage pipe for supplying power to the induction heating coil and circulating cooling water is inserted through the vertical plate. An opening is provided in the side wall of the vacuum chamber into which the truck can be inserted, so that the vertical plate can airtightly close the opening when the truck is inserted into the vacuum chamber, and the power supply and drain pipe is connected to the outside of the vertical plate. A vacuum induction melting furnace characterized in that it can be detachably connected to a power source and a wandering water source.