JPH073858U - Vacuum induction melting casting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] An induction melting furnace and a plurality of small molds are placed in a vacuum chamber to eliminate hot water spillage and hot water sticking that occur when the melting furnace is tilted and tapped into the small molds. The purpose is to eliminate difficult and troublesome work such as determining the tilting fulcrum and tilting angle of the melting furnace. [Structure] Located between the induction melting furnace 2 and the small mold,
An intermediate container 10 having a hot water receiving part 12, a hot water pool 11, and a hot water discharging part 13, a heating device 16 arranged around the outer circumference of the hot water pool 11 and using a carbon heater, a tilting device 15 for tilting the intermediate container 10, This is a configuration including a mold placement device 8 on which a plurality of small molds are placed and which can be moved up and down.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vacuum induction melting casting apparatus for melting metals and their alloys by a vacuum induction melting furnace in an airtight tank kept in a vacuum or an inert gas atmosphere, and casting in the airtight tank. The present invention relates to a vacuum induction melting and casting apparatus having a dispensing function for dispensing molten metal to be poured into a plurality of small molds placed in an airtight tank and tapping the molten metal.

[0002]

[Prior art]

 A molten metal or alloy (hereinafter referred to as molten metal) melted in a vacuum induction melting furnace (hereinafter, simply referred to as “induction melting furnace” or simply “melting furnace”) is generally poured into a plurality of molds having a smaller capacity than the melting furnace. In that case, molten metal is poured from the furnace body or crucible into the respective molds through the tap gutter.

[0003]

[Problems to be solved by the device]

 As described above, in the method of pouring molten metal directly from the induction melting furnace into the small mold, it is difficult to set an appropriate pouring speed and tilting condition of the induction melting furnace according to the size and internal shape of the mold. In many cases, molten metal cannot be poured in a satisfactory condition with little loss of molten metal. In addition, since the amount of molten metal to be dispensed is small, placing an intermediate container with a small volume equivalent to one or more of the small molds in the middle causes the temperature of the molten metal discharged from the induction melting furnace to rise. However, there are problems such as that the temperature drops in the intermediate container and adheres to the refractory material in the intermediate container, and the casting temperature decreases, resulting in defective casting.

[0004]

[Means for Solving the Problems]

 In the present invention, an intermediate container having a hot water receiving part, a hot water pool part, and a discharge gutter is provided at an intermediate position between the conventional vacuum induction melting furnace and the small mold in the vacuum tank, and has a capacity smaller than that of the induction melting furnace. A carbon heater for preventing the temperature drop of the molten metal inside, a heating power supply of a capacity capable of outputting the amount of heat radiation enough to compensate for the temperature drop, and the above-mentioned intermediate container are provided on the outer periphery of the above-mentioned molten metal pool. The above problem is solved by providing a tilting mechanism for tilting.

[0005]

[Action]

 When the induction melting furnace is tilted, the molten metal flows from the crucible through the tapping trough, through the hot water receiving part of the intermediate container, and flows into the hot water pool. This molten metal pool is heated by a heating device to a predetermined temperature that is higher than the melting point of the metal or alloy to be melted and that is necessary to ensure an appropriate casting temperature, and prevents the temperature of the molten metal inside the intermediate container from decreasing. For pouring the molten metal from this intermediate container to at least one desired small mold among a plurality of small molds arranged around it, the molten metal is melted from the pool to the desired small mold by tilting by the tilting mechanism. In order to pour the water into the next small mold after this, the mold mounting device is rotated in a turntable manner by a motor with a speed reducer.

[0006]

【Example】

 FIG. 1 is a partial vertical elevational view showing an embodiment of a vacuum induction melting casting apparatus according to the present invention, FIG. 2 is a front view taken along the line AA of FIG. 1, and a partial plan view taken along the arrow B of FIG. Is shown in FIG. In these figures, an induction melting furnace 2 is mounted in a vacuum tank 1 in the shape of a cylindrical tank so as to be tiltable by a tilting shaft 3. On the other hand, the same number (8 in this example) of prism-shaped mounting bases 4 on which a plurality of small molds are respectively mounted, one on top and one on bottom are horizontally arranged vertically at a predetermined interval. The two guide plates 5 are supported by a ring-shaped guide plate 5, and the two guide plates 5 are located below the lower guide plate 5 by four pins 7a and 7b, respectively. It is fixed to 6 and is placed vertically above the disk 6 on a parallel circumference. The mold mounting device 8 including the mounting table 4, the guide plate 5, the disc 6 and the pins 7a and 7b is a cylindrical seal chamber 1a by a lifting device (not shown) via a groove steel bracket 9. As shown in FIG. 3, each of the small molds is arranged in a turntable shape as shown in FIG. Is driven to rotate, and the desired mold is placed at a position below the tap gutter 13 of the tilted intermediate container.

As shown in FIGS. 1 and 3, the intermediate container 10 includes a cup-shaped hot water pool portion 11 having an upper opening, and the hot water pool portion in a state in which the intermediate container 10 is horizontal. 11 is composed of a gutter-shaped hot water receiving portion 12 that extends upward from the upper edge 11a toward the induction melting furnace 2 and a hot water outlet gutter 13 that also extends horizontally from the upper edge 11a in the opposite direction to the hot water receiving portion 12. Then, the induction melting furnace 2 and the mold placing device 8 are arranged substantially in the middle. On the other hand, the tilting device 15 of the intermediate container 10 shown in FIGS. 2 and 3 is formed in a box shape by welding a heating device 16 surrounding the outer periphery of the basin 11 and a steel plate to support the intermediate container 10. And a tilting shaft 18 for tilting the supporting table 17. The heating device 16 has, as an enlarged front view and a plan view, a hollow annular outer wall as shown in FIGS. 4 and 5, respectively, and the hollow portion of the outer wall is a cylindrical carbon cylinder which can withstand high temperatures and has a long life. The data storage unit 19 is housed. The carbon heater 19 has incisions 19b which are alternately turned inward from the upper edge and the lower edge of the cylindrical portion 19a, and the connecting portions 19c and 19d are extended symmetrically outward at the upper portion, respectively. Through holes 19e and 19f for attaching the connecting portion are formed near the end of the.

The support 17 is a horizontally extending rectangular box-shaped member, and has a ring-shaped ring plate 17b at the left end in the figure of the bottom plate 17a in which the weight reducing window 17'a is opened. Are welded to surround the heating device 16 and four L-shaped pressing plates 20 are screwed to the ring plate 17b so as to hold the pool 11 of the intermediate container 10 at its upper end and outer periphery. Also, as shown in FIGS. 2 and 3, ribs 17c and 17d are welded and joined to the long side end and the short side end of the bottom plate 17a, respectively, and a boss 17e is provided at the extension of the rib 17d, and a rib 17d. Ribs 17f and 17g are welded to reinforce 17d. The left end of the tilting shaft 18 is screwed into the hole 21 of the boss 17e, and is horizontally supported by a bearing 23 fixed to the vacuum chamber 1 via a bracket 22 and a seal bearing 24 of the vacuum chamber 1. A handle 25 for tilting the intermediate container 10 is attached to the right end of the tilting shaft 18 so as to be rotatable.

The operation of the vacuum induction melting and casting apparatus according to the present invention will be described. In FIG. 1, the molten metal melted by the induction melting furnace 2 is directed toward the position indicated by the two-dot chain line by the tilting shaft 3 of the melting furnace 2. As it is tilted counterclockwise by, it flows down into the hot water receiving portion 12 of the intermediate container 10 and is then stored in the cup-shaped hot water pool portion 11. The carbon heater 19 of the heating device 16 is previously energized to keep the temperature of the basin 11 higher than the melting point of the metal to be melted so as to compensate for the temperature drop in the intermediate container 10. . Next, the handle 25 is operated to tilt the intermediate container 10 through the tilting shaft 18 of the intermediate container and the support base 17 toward the position shown by the chain double-dashed line, and is cast from the tapping gutter 13 onto the mounting table 4. Dispense into a small mold (not shown) to be dispensed. When the capacity of the intermediate container 10 is the same as the capacity of the small mold, that is, when the molten metal is supplied to the intermediate container 10 for each small mold, the induction melting furnace is used while pouring the molten metal from the intermediate container 10. When the induction melting furnace 2 is tilted once, the molten metal corresponding to a plurality of small molds is injected into the molten metal pool portion 11 of the intermediate container 10 to cast in each mold. The mold placing device 8 may be rotated by a rotating device (not shown) and dispensed into small molds one after another.

[0010]

[Effect of device]

 When the molten metal is dispensed into one or more small molds, the amount corresponding to the dispensed amount can be stored in the hot water reservoir of the intermediate container. It can be easily cast into small molds without causing burrs and without requiring complicated work for determining the tilt fulcrum and tilt angle of the melting furnace.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional elevation view of an embodiment of a vacuum induction melting and casting apparatus according to the present invention.

2 is a sectional side view taken along the line AA of FIG.

FIG. 3 is a partial plan view taken along arrow B of FIG.

FIG. 4 is an enlarged front view of a carbon heater included in the heating device shown in FIG.

FIG. 5 is a plan view of the carbon heater shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 vacuum tank 2 induction melting furnace 4 mold mounting table 8 mold mounting apparatus 10 intermediate container 11 hot water pool section 12 hot water receiving section 13 tapping gutter 15 tilting apparatus 16 heating apparatus 17 support stand 19 carbon heater M with speed reducer -

Claims (2)

[Scope of utility model registration request] 1. A molten metal or alloy melted by an induction melting furnace in an airtight tank kept in a vacuum or an inert gas atmosphere, is tilted in the melting furnace, and has a plurality of small volumes smaller than the melting furnace. In a vacuum induction melting casting apparatus for casting in a mold, supported on a support table supported on the peripheral wall of the airtight tank, slightly ahead of the tilting path of the melting furnace in the middle of the induction melting furnace and the plurality of molds. A hot water receiving part arranged to receive molten metal from the melting furnace, a hot water pool part having an upper portion opened to receive the molten metal from the hot water receiving part and store the molten metal, and a tap gutter for tapping the molten metal in the hot water pool part. A tilting device for tilting the support table for discharging the molten metal in the molten metal pool part, and a heating device arranged on the outer periphery of the molten metal pool part for preventing a temperature drop of the molten metal in the molten metal pool part. Intermediate container and bottom wall of the airtight tank A mold mounting table that penetrates the bottom wall of the airtight tank from below and stands vertically movably upward while maintaining a fluid-tight state with respect to the outside of the airtight tank, and mounts each of the small molds on the upper part of each. Having a small mold to be poured at a casting position under the tap gutter when the intermediate container is swung for pouring, and after the completion of pouring the next small mold to the casting position. A vacuum induction melting and casting apparatus, comprising: a small mold placing device having a turntable function for moving. 2. The vacuum induction melting casting apparatus according to claim 1, wherein the heating device for preventing the temperature drop of the molten metal in the molten metal pool is a tubular member arranged on the outer periphery of the peripheral wall of the molten metal pool. A carbon heater having a plurality of notches alternately extending from the upper edge and the lower edge in the height direction,
A vacuum induction melting and casting apparatus comprising a carbon heater mounted on the inner periphery of the support base and a current supply device for heating the carbon heater.