CN109676098B - One-furnace multi-ingot casting device and method for vacuum induction furnace - Google Patents

Abstract

A vacuum induction furnace multi-ingot casting device and method, the device comprises a vacuum sealed tank, an induction furnace body, an electric turntable, a support rod, a funnel-type retarder, a chute, a mold, a mold fixing frame and a pouring riser; a funnel; The type retarder is set on the electric turntable through the support rod. One end of the chute is connected with the funnel type retarder. The lower part of the chute is provided with a heating coil. The molds are distributed circumferentially with the electric turntable as the center. There is a weighing mechanism under the mold. The method is: hoist a set number of molds and pouring risers to the mold holder in the vacuum-sealed tank in turn, adjust the weighing mechanism to zero, add metal raw materials into the induction furnace body, close the vacuum-sealed tank and vacuumize, melt When the metal raw material reaches the set temperature, the body of the induction furnace is tilted to introduce the molten metal into the mold. When the weight of the molten metal in the mold reaches 2/3 of the set value, start the supplementary temperature until the casting of the mold is completed. Repeat the casting process until all the molds are cast. Finish.

Description

A vacuum induction furnace multi-ingot casting device and method

technical field

The invention belongs to the technical field of smelting and casting, and in particular relates to a device and method for casting multiple ingots in one furnace of a vacuum induction furnace.

Background technique

As a commonly used vacuum equipment for smelting special materials, the vacuum induction furnace generates eddy currents in the electromagnetic induction process to melt the metal raw materials in the furnace body, thereby achieving the purpose of smelting high-purity metals and alloys; with the improvement of the capacity of smelting equipment At present, the commonly used vacuum induction furnaces are mostly ton-level furnaces, and there are many corresponding casting molds. Due to the independence of the vacuum induction furnace casting system, the following problems often occur during the casting process: First, during the casting process, The mold cannot be placed under the pouring nozzle quickly and accurately; second, during the process of changing the mold, the temperature of the metal in the furnace will drop, resulting in energy waste; third, the molten metal in the mold is prone to "bridge" during the solidification process. , and as the casting progresses, the temperature of the molten metal in the furnace is low, and it will not be able to solidify and feed the "under the bridge", so the castings in the mold are prone to quality problems such as looseness and shrinkage cavities, resulting in a low yield.

To this end, those skilled in the art have designed a variety of devices and methods for casting multiple ingots in one furnace. The following are examples:

1. The Chinese patent application whose publication number is CN105964956A discloses a method for smelting and casting steel ingots in a vacuum induction furnace. A circular guide rail is set in the furnace body, and a casting car is set on the guide rail. The movement in the guide rail enables the mold to be accurately placed under the pouring nozzle. The ingot mold bottom is connected to avoid quality problems such as ingot shrinkage; It is more complicated, and when the number of casting molds is too large, it also has higher requirements on the load quality of the hydraulic rod.

2. The Chinese patent application whose publication number is CN203900455U discloses a vacuum induction furnace rotary pouring mechanism, which sets a plurality of molds on a rotating tray, and rotates the molds to the bottom of the pouring nozzle through the movement of the rotating tray. Multi-mould casting; however, in the later stage of casting, this solution cannot avoid ingot quality problems caused by the reduction of molten metal temperature, and as the casting progresses, the force on the rotating tray will become uneven, resulting in the acceleration of the rotating bearing Wear and tear, thereby increasing the consumption of smelting costs.

3. The Chinese patent application whose publication number is CN205128856U discloses a casting and diverting device for the production of high-temperature mother alloys. By designing a diversion groove and a diverting plate, the molten steel is stably distributed into the diverting plate through the diversion groove, and then casting However, this solution simply divides the molten steel and fails to accurately control the weight of each ingot, and in the later stage of casting, it cannot avoid the shrinkage cavity caused by the low temperature of the molten steel. and other quality issues.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the present invention provides a multi-ingot casting device and method for a vacuum induction furnace, which can quickly cast the molten metal in the furnace into the mold under the premise of ensuring that the mold does not move. The molten metal can be warmed up before the molten metal is poured into the mold. Even if the molten metal in the mold has a "bridge" phenomenon during the solidification process, the molten metal after completing the warm-up can also solidify and shrink "under the bridge". , in order to improve the quality of ingots.

In order to achieve the above purpose, the present invention adopts the following technical scheme: a vacuum induction furnace multi-ingot casting device, comprising a vacuum sealed tank, an induction furnace body, an electric turntable, a support rod, a funnel-type retarder, a chute, a mold, A mold holder and a pouring riser; the electric turntable is installed on the bottom of the vacuum-sealed tank, the support rod is vertically fixed on the electric turntable, and the funnel-type retarder is fixedly installed on the top of the support rod; the There are a number of mold holders, several mold holders are centered on the electric turntable and evenly distributed in the circumferential direction, each mold holder is placed with a mold, and the top of each mold is configured with a pouring riser; the One end of the chute is connected to the funnel-type retarder, the other end of the chute is located just above the pouring riser, and a heating coil is installed at the lower part of the chute; the electric turntable is used to drive the support rod, the funnel-type retarder and the chute to rotate synchronously.

A weighing mechanism is installed between the mold fixing frame and the tank bottom of the vacuum-sealing tank, and a high temperature-resistant heat insulation gasket is installed between the mold fixing frame and the weighing mechanism.

Two U-shaped clamping grooves are symmetrically arranged on the mold fixing frame, and two lifting lugs are symmetrically arranged on the mold.

Two lifting rings are symmetrically arranged on the casting riser, and the casting riser is hoisted by the lifting rings.

A method for casting multiple ingots in one furnace of a vacuum induction furnace adopts the device for casting multiple ingots in one furnace of a vacuum induction furnace, comprising the following steps:

Step 1: Hoist the set number of molds to the mold holder in the vacuum-sealed tank in turn to ensure that the lifting lugs on the mold accurately enter the U-shaped grooves on the mold holder;

Step 2: Hoist the set number of pouring risers to the mold in turn to ensure accurate connection between the pouring risers and the mold;

Step 3: Start the electric turntable, control the support rod, the funnel-type retarder and the chute to rotate synchronously, so that the liquid outlet end of the chute is located just above the first pouring riser;

Step 4: Zero-adjust all weighing mechanisms;

Step 5: Add metal raw materials into the furnace body of the induction furnace;

Step 6: Close the vacuum sealing tank and complete the vacuuming in the tank;

Step 7: start the induction furnace body to generate eddy current to melt the metal raw material in the induction furnace body until the molten metal in the induction furnace body reaches the set temperature;

Step 8: Tilt the induction furnace body, so that the molten metal in the induction furnace body enters the mold through the funnel-type retarder, the chute and the pouring riser in sequence;

Step 9: When the real-time weight value measured by the weighing mechanism reaches 2/3 of the set weight value, the heating coil is activated, and the heating coil is used to supplement the temperature of the molten metal flowing through the chute;

Step 10: When the real-time weight value measured by the weighing mechanism reaches the set weight value, the induction furnace body is reset, and the heating coil is powered off;

Step 11: Start the electric turntable, control the support rod, the funnel-type retarder and the chute to rotate synchronously, so that the liquid outlet end of the chute moves directly above the next pouring riser;

Step 12: Repeat steps 8 to 11 until the casting of all molds is completed;

Step 13: When the cooling of the ingots in all the molds is completed, the vacuum sealing tank is opened, and all the molds are taken out from the vacuum sealing tank in turn, and all the molds are demolded. At this time, the multi-ingot casting process in one furnace ends.

Beneficial effects of the present invention:

The device and method for casting multiple ingots in one furnace of a vacuum induction furnace of the present invention can quickly cast the molten metal in the furnace into the mold on the premise that the mold does not move. When the molten metal is warmed up, even if the molten metal in the mold produces a "bridge" phenomenon during the solidification process, the molten metal after completing the warm-up can also solidify and shrink "under the bridge" to improve the quality of the ingot.

Description of drawings

Fig. 1 is the structural representation of a kind of vacuum induction furnace multi-ingot casting device of the present invention;

Fig. 2 is A-A sectional view in Fig. 1;

Figure 3 is a schematic diagram of the assembly of the weighing mechanism, the high temperature heat insulating gasket, the mold holder, the mold and the pouring riser;

In the figure, 1—vacuum sealing tank, 2—induction furnace body, 3—electric turntable, 4—support rod, 5—funnel type damper, 6—chute, 7—mould, 8—mould fixing frame, 9— Casting riser, 10—heating coil, 11—weighing mechanism, 12—high temperature heat-resistant insulation gasket, 13—U-shaped slot, 14—lifting lug, 15—hoisting ring.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-3, a vacuum induction furnace multi-ingot casting device includes a vacuum sealed tank 1, an induction furnace body 2, an electric turntable 3, a support rod 4, a funnel-type damper 5, a chute 6, The mold 7, the mold holder 8 and the pouring riser 9; the electric turntable 3 is installed on the bottom of the vacuum sealing tank 1, the support rod 4 is vertically fixed on the electric turntable 3, and the funnel-type damper 5 is fixedly mounted on the top of the support rod 4; the number of the mold holders 8 is several, several mold holders 8 are centered on the electric turntable 3 and evenly distributed in the circumferential direction, and each mold holder 8 is placed with a mold 7 , the top of each mold 7 is equipped with a pouring riser 9; one end of the chute 6 is connected to the funnel-type damper 5, the other end of the chute 6 is located just above the pouring riser 9, and a heating element is installed at the lower part of the chute 6 The coil 10; the electric turntable 3 is used to drive the support rod 4, the funnel-type damper 5 and the chute 6 to rotate synchronously.

A weighing mechanism 11 is installed between the mold fixing frame 8 and the tank bottom of the vacuum-sealed tank 1 , and a high-temperature-resistant heat-insulating gasket 12 is installed between the mold fixing frame 8 and the weighing mechanism 11 .

Two U-shaped clamping grooves 13 are symmetrically arranged on the mold holder 8, and two lifting lugs 14 are symmetrically arranged on the mold 7. The lifting lugs 14 are snap-fitted with the U-shaped clamping grooves 13, and the mold 7 passes through The lifting lugs 14 are hoisted.

Two lifting rings 15 are symmetrically arranged on the casting riser 9 , and the casting riser 9 is hoisted by the lifting rings 15 .

A method for casting multiple ingots in one furnace of a vacuum induction furnace adopts the device for casting multiple ingots in one furnace of a vacuum induction furnace, comprising the following steps:

Step 1: Hoist the set number of molds 7 to the mold holder 8 in the vacuum-sealed tank 1 in turn to ensure that the lifting lugs 14 on the mold 7 accurately enter the U-shaped grooves 13 on the mold holder 8;

Step 2: Hoist the set number of pouring risers 9 to the mold 7 in turn to ensure that the pouring risers 9 are accurately connected to the mold 7;

Step 3: start the electric turntable 3, control the support rod 4, the funnel-type retarder 5 and the chute 6 to rotate synchronously, so that the liquid outlet end of the chute 6 is located directly above the first pouring riser 9;

Step 4: Zero adjustment of all weighing mechanisms 11;

Step 5: adding metal raw materials into the induction furnace body 2;

Step 6: Close the vacuum sealing tank 1, and complete the vacuuming in the tank;

Step 7: start the induction furnace body 2 to generate eddy current, so that the metal raw material in the induction furnace body 2 is melted until the molten metal in the induction furnace body 2 reaches the set temperature;

Step 8: Tilt the induction furnace body 2, so that the molten metal in the induction furnace body 2 enters the mold 7 through the funnel-type damper 5, the chute 6 and the pouring riser 9 in sequence;

Step 9: when the real-time weight value measured by the weighing mechanism 11 reaches 2/3 of the set weight value, the heating coil 10 is activated, and the heating coil 10 is used to supplement the temperature of the molten metal flowing through the chute 6;

Step ten: when the real-time weight value measured by the weighing mechanism 11 reaches the set weight value, the induction furnace body 2 is reset, and the heating coil 10 is powered off;

Step 11: Start the electric turntable 3, control the support rod 4, the funnel-type retarder 5 and the chute 6 to rotate synchronously, so that the liquid outlet end of the chute 6 is moved directly above the next pouring riser 9;

Step 12: Repeat steps 8 to 11 until the casting of all molds 7 is completed;

Step 13: After the cooling of the ingots in all the molds 7 is completed, the vacuum sealing tank 1 is opened, and all the molds 7 are taken out from the vacuum sealing tank 1 in turn, and all the molds 7 are demolded. At this time, multiple ingots are cast in one furnace. Process ends.

The solutions in the embodiments are not intended to limit the scope of the patent protection of the present invention, and all equivalent implementations or modifications that do not depart from the present invention are included in the scope of the patent of this case.

Claims (2)

1. The utility model provides a vacuum induction furnace stove many ingots casting device which characterized in that: the device comprises a vacuum sealing tank, an induction furnace body, an electric rotary table, a supporting rod, a funnel-shaped flow damper, a chute, a mold fixing frame and a pouring riser; the electric turntable is arranged at the bottom of the vacuum sealing tank, the supporting rod is vertically and fixedly arranged on the electric turntable, and the funnel-shaped flow damper is fixedly arranged at the top of the supporting rod; the mold fixing frames are a plurality of in number, the mold fixing frames are uniformly distributed in the circumferential direction by taking the electric turntable as the center, a mold is placed on each mold fixing frame, and the top of each mold is provided with a pouring riser; one end of the chute is connected to the funnel-shaped flow retarder, the other end of the chute is positioned right above the casting riser, and the lower part of the chute is provided with a heating coil; the electric turntable is used for driving the supporting rod, the funnel-shaped flow damper and the chute to synchronously rotate; a weighing mechanism is arranged between the mould fixing frame and the bottom of the vacuum sealing tank, and a high-temperature-resistant heat-insulating gasket is arranged between the mould fixing frame and the weighing mechanism; the die fixing frame is symmetrically provided with two U-shaped clamping grooves, the die is symmetrically provided with two lifting lugs, the lifting lugs are clamped and matched with the U-shaped clamping grooves, and the die is hoisted through the lifting lugs; and two lifting rings are symmetrically arranged on the pouring riser, and the pouring riser is hoisted through the lifting rings.

2. A vacuum induction furnace one-furnace multi-ingot casting method adopts the vacuum induction furnace one-furnace multi-ingot casting device of claim 1, and is characterized by comprising the following steps:

the method comprises the following steps: sequentially hoisting a set number of moulds to a mould fixing frame in a vacuum sealing tank, and ensuring that lifting lugs on the moulds accurately enter U-shaped clamping grooves on the mould fixing frame;

step two: hoisting a set number of pouring risers to the mold in sequence to ensure that the pouring risers are accurately butted with the mold;

step three: starting the electric turntable, and controlling the supporting rod, the funnel-shaped flow damper and the chute to synchronously rotate, so that the liquid outlet end of the chute is positioned right above the first pouring riser;

step four: zeroing all weighing mechanisms;

step five: adding metal raw materials into the furnace body of the induction furnace;

step six: sealing the vacuum sealing tank to finish the vacuum pumping in the tank;

step seven: starting the furnace body of the induction furnace to generate eddy current so as to melt the metal raw material in the furnace body of the induction furnace until the molten metal in the furnace body of the induction furnace reaches a set temperature;

step eight: tilting the furnace body of the induction furnace to enable molten metal in the furnace body of the induction furnace to enter a mold sequentially through a funnel-shaped flow damper, a chute and a pouring riser;

step nine: when the real-time weight value measured by the weighing mechanism reaches 2/3 of the set weight value, starting the heating coil, and supplementing the temperature of the molten metal flowing through the chute through the heating coil;

step ten: when the real-time weight value measured by the weighing mechanism reaches a set weight value, the induction furnace body is reset, and the heating coil is powered off;

step eleven: starting the electric turntable, controlling the supporting rod, the funnel-shaped flow damper and the chute to synchronously rotate, and moving the liquid outlet end of the chute to be right above the next pouring riser;

step twelve: repeating the eighth step to the eleventh step until the casting work of all the molds is completed;

step thirteen: and after the ingot in all the molds is cooled, opening the vacuum seal tank, taking all the molds out of the vacuum seal tank in sequence, demolding all the molds, and finishing the one-furnace multi-ingot casting process.

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