KR20060010619A - Continuous fabrication equipment of rheology material with continuous rotational pressure automatic control type - Google Patents

Abstract

The present invention relates to an apparatus for continuously producing rheology materials having excellent mechanical properties. The present apparatus can include a molten metal melted in the melting furnace, the outer furnace is provided with an induction coil for temperature control of the molten metal; A cooling tube connected to the gate of the heat keeping furnace, the outside having a heating device and a cooling device; A stirring tank connected to the cooling pipe and having an induction coil installed therein for temperature control; A stirrer installed inside the stirring tank and rotating by a driving source; A discharge pipe connected to an outlet of the stirring tank and provided with an induction coil for temperature control; And a cutting device capable of cutting the metal in the solid-liquid coexisting through the discharge tube to a predetermined length.

Rheology material, reaction vessel, stirring, molten metal

Description

Continuous fabrication equipment of rheology material with continuous rotational pressure automatic control type

1 is a schematic view showing in cross section the configuration of a continuous manufacturing apparatus according to the present invention.

Figure 2 is a cross-sectional view of the stirrer portion of the present invention.

Figure 3a is a perspective view of the upper stirrer of the present invention.

Figure 3b is a plan view of the upper stirrer of the present invention.

Figure 3c is a cross-sectional view of the upper stirrer of the present invention.

Explanation of symbols on the main parts of the drawings

1 ..... insulation furnace 2 ..... air supply

3 ..... induction coil 4 ..... molten gate

5 ..... Cooling line 6 ..... Heating

7 ..... Chiller 8 ..... Stirring Tank

9 ..... Agitator 10 ..... Induction coil

11 ..... Stirrer drive 12 ..... Discharge tube

13 .... cutting 16 ..... slurry

17 ..... Upper Agitator 18 ..... Lower Agitator

25 ..... Blade

The present invention relates to a device for continuously manufacturing a rheology material, and more particularly, a continuous production apparatus of rheology material which can produce a reaction solid slurry having fine grains and uniform spherical structure using a mechanical stirring method. It is about.

Recently, due to the diversification and advancement of material performance, many production apparatus and manufacturing techniques of rheology materials have been developed, and one of them is casting and forging processes using reaction solid materials.

The reaction solidification casting and forging process refers to producing a desired product through a molding process such as casting and forging in a state in which a solid state and a liquid are finely mixed by applying a strong stirring force during the solidification of the molten metal. In addition, this process is a new molding process that can easily produce complex shapes by improving flowability, which is a characteristic of general casting, and also obtains excellent mechanical properties beyond plastic processing methods such as forging. There is a need to develop equipment for manufacturing this controlled rheology material.

Rheo Forming is characterized by:

1) Since the existing dendrite structure is destroyed by stirring in the solid-liquid coexisting region during solidification, a fine structure in which nearly spherical primary particles are uniformly dispersed can be obtained instead of the dendrite structure existing in a conventional casting.

2) Reduction of internal defects, segregation, etc., as well as products of uniform quality from low to high solids.

3) Since most of the latent heat of solidification is released and cast, the heat load on the casting machine can be reduced to improve the life of the device including the mold and shorten the manufacturing time.

4) By reducing the heat load on the processing equipment, it is possible to process near-net shape products that are close to the final product.

5) It is possible to manufacture alloys in which metal elements with large specific gravity differences or small solid solubility which are difficult to manufacture by the general casting method are uniformly dispersed.

Due to the practical use of the reactive solid-forming method having the above characteristics, the quality, reliability, and function of the metal material can be improved, and it is possible to reduce the cost by energy saving during manufacturing and mass production of the hard workability and the high-performance material, and the metal material and composite of the new function. The manufacture of the material will be possible.

Viscosity of the alloy slurry is changed according to the stirring and solidification conditions in the solid-liquid coexistence region, and mechanical stirring and electromagnetic stirring are largely used as a stirring method for preparing the metal alloy slurry.

Mechanical Stirring is a method in which a screw-shaped stirrer is placed in a high liquid metal to solidify by controlling the cooling rate while destroying the dendrite in the state of rotation or the like. Although there are advantages such as that can be obtained, problems have been pointed out in practical use because of the durability of the screw and the control limit of the solid phase rate.

And the Passive method, by filling a spherical ceramic ball into the metal tube in which the high-liquid metal is cooled and forcibly passing the metal, can solve the durability problem of the stirrer, but has a disadvantage that can not control the shear force on the metal.

Electromagnetic stirring is a method of stirring the molten metal by an electromagnetic force using an induction current, which causes a significant decrease in the stirring effect of the center of the molten metal, and inevitably requires the apparatus to be large and expensive. As a result, their application to the devices required for manufacturing parts is very limited.

An object of the present invention is to provide an apparatus for continuously producing rheology materials in which crystal grains are fine and uniform spherical structure can be obtained.

And this object of the present invention can be achieved by a device using a mechanical stirring method, which is most preferably designed to simplify the apparatus and to a strong stirring technique. The apparatus of the present invention enables a series of continuous operations such as temperature control from the molten molten metal to the solid-liquid coexistence zone, mechanical agitation in the solid-liquid coexistence zone, and a device for specific temperature control and metered discharge due to this stirring force. Will be done.

And in the case of a wider range of solid phase rate (30 ~ 80%) to provide a stronger shearing force and a stirring device that can be easier to replace and rework the stirrer at the time of re-stirring.

In order to achieve the above object, the continuous production apparatus of rheologic material according to the present invention, the molten metal in the melting furnace can contain a thermal insulation furnace is installed, the induction coil for the temperature control of the molten metal; A cooling tube connected to the gate of the heat keeping furnace, the outside having a heating device and a cooling device; A stirring tank connected to the cooling pipe and having an induction coil installed therein for temperature control; A stirrer installed inside the stirring tank and rotating by a driving source; A discharge pipe connected to an outlet of the stirring tank and provided with an induction coil for temperature control; And a cutting device capable of cutting the metal in the solid-liquid coexisting through the discharge tube to a predetermined length.

According to the embodiment, the cutting device comprises a hydraulic cylinder and a cutter reciprocating by the hydraulic cylinder.

And according to the embodiment, the agitator is provided with an upper stirrer having a plurality of symmetrically formed gates, a predetermined interval with the upper stirrer, the lower stirrer with an outlet formed in the center portion, and the upper stirrer It is formed in the center of the bottom face of the ruler, and consists of a screw part for discharging a metal to the said exit.

Further, it is more preferable that a blade protruded upward is formed at one side of the gate upper side of the upper stirrer to introduce metal into the gate. The blade is formed above the gate at a position corresponding to the rear side with respect to the rotational direction of the upper stirrer.

And the gate is preferably formed to be inclined backward with respect to the rotation of the upper stirrer.

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

As described above, the apparatus according to the present invention is an apparatus for continuously producing a semi-solid slurry supplied to a molding apparatus such as die casting and forging, and mechanical stirring is applied to obtain a fine and uniform spherical structure. In addition, it has a structure for obtaining a solid-liquid coexistence state in the molten metal, and has a structure of a stirrer and a stirring device for easier control of more powerful shear force and discharge amount. Through the quantitative control of the rheology material in which the crystal grains obtained by the apparatus of the present invention are controlled, the semi-solid slurry is continuously provided to a molding apparatus such as die casting and forging.

As shown in FIG. 1, the thermal furnace 1 applied to the apparatus is a thermal furnace that maintains a molten metal supplied by melting in a melting furnace at a constant temperature. In order to maintain the molten metal in the thermal furnace 1 at a constant temperature, a heating device is provided around the thermal furnace 1, for example, an induction coil 3 is provided around the thermal furnace 1. It is comprised so that heat may be supplied to the said heat retention furnace 1 by electricity supply, and the internal molten metal can be maintained at a fixed temperature.

And the air supply part 2 is provided above the heat retention furnace 1. The air supply unit 2 is configured to supply the molten gas inside the thermal furnace 1 through the molten metal gate 4 by supplying a gas of high pressure. The air supply unit 2 is connected to a gas source of substantially high pressure, so that the high pressure gas is supplied into the thermal furnace 1 under control, so that the internal pressure can be kept constant.

And the molten metal which is tapping through the molten metal gate 4 provided in the lower side of the said heat retention furnace 1 is comprised so that it may be guided to the cooling pipe 5. The cooling tube 5 is a portion for guiding the molten metal in the thermal furnace 1 into the stirring tank 8 described later, at a constant temperature (solid liquid coexistence temperature).

Outside the cooling tube (5), a heating device (6) and a cooling device (7) are installed to maintain the temperature of the molten metal at a proper temperature in the process of guiding the molten metal inside the cooling tube to the stirring tank (8). It is. The heating device 6 may be composed of a heating wire or an induction coil that generates heat by application of electricity. The cooling device 7 may have any configuration as long as it can lower the temperature of the molten metal in the cooling pipe 5. For example, the cooling device 7 may be a pipe for air cooling, a pipe for water cooling, or a refrigerant pipe for a freezing cycle. Any configuration can be used as long as the temperature can be lowered.

The cooling tube 5 is connected to the stirring tank 8 so that the molten metal passing through the cooling tube 5 is connected to the stirring tank 8. The stirring tank 8 is a device for stirring the metal in the solid state coexistence state.

The stirring tank 8 is provided with a stirrer 9 for obtaining a strong shear force and earth output against the molten metal. In addition, an induction coil 10 is installed outside the stirring tank 8 to maintain the molten metal in the stirring tank 8 at an appropriate temperature. The induction coil 10 is installed by heating the molten metal in the stirring tank 8 so as to provide an optimum reaction state of the product.

And the stirrer (9) is installed so as to rotate inside the stirring tank (8) by the stirrer drive unit (11). The rotational force in the stirrer drive unit 11 is transmitted to the stirrer 9 through a power transmission mechanism such as a belt.

The stirrer 9 of the present invention is composed of an upper stirrer 17 and a lower stirrer 18. The upper stirrer 17 and the lower stirrer 18 are installed to have a predetermined interval, thereby generating shear force and earth output between the rotating upper stirrer 17 and the fixed lower stirrer 18 In addition, the amount of rotation of the molten metal is controlled.

As shown in FIG. 3, which shows the upper stirrer 17 of the present invention, the upper stirrer 17 has a plurality of symmetrical gates 20, and the molten metal 19 is formed of the upper stirrer 17. It is injected through the gate 20 by the rotational force. In addition, a blade 25 is formed at an outer portion of the gate 20 of the upper stirrer 17 to inject the molten metal 19. The blade 25 is installed on the lower side in the rotational direction of the upper stirrer 17, so that the molten metal 19 can be more easily injected into the gate 20. The gate 20 is formed to be inclined in one direction, as shown in FIG. 3C. That is, the gate 20 is formed in a state inclined backward toward the lower side with respect to the rotation direction of the upper stirrer 17. This means that the inclination direction of the gate 20 is inclined toward the blade 25 toward the lower side.

The molten metal injected into the gate 20 is applied with shear force between the lower agitator 18 by the rotational force of the upper agitator 17. The bottom surface of the upper stirrer 17 and the upper surface of the lower stirrer 18 are formed so that the center portion is downward, and the outlet 23 through which the molten metal is supplied is formed at the lowest point portion of the central portion of the lower stirrer 18. It is. Therefore, when the upper stirrer 17 rotates to guide the molten metal to the gate 20, the molten metal is concentrated to the center of the lower stirrer 18.

The lower surface of the upper stirrer 17 is formed with a screw portion 22 extending into the outlet 23 of the lower stirrer 18. Thus, by the screw portion 22, the earth output is applied by the screw 22 at the center portion toward the outlet 23 of the lower stirrer 18. And the final shearing force is applied to the stirred metal is released through the outlet 23 of the stirring tank (8).

The metal discharged through the outlet 23 is guided to the discharge tube 12. The discharge tube 12 is a device for guiding and insulating the stirred slurry. An induction coil 14 is provided outside the discharge tube 12 to maintain the metal exiting through the discharge tube 12 at a desired temperature.

On the outer side of the discharge tube 12, a cutting portion 13 capable of cutting the slurry 16 to a desired length is provided. In the present exemplary embodiment, the cutting part 13 may include a hydraulic cylinder 13b and a cutter 13a capable of cutting the metal discharged from the discharge pipe 12 while linearly reciprocating by the hydraulic cylinder 13b. It consists of).

The slurry 16 discharged from the discharge tube 12 is a slurry of a fine spherical structure having a desired solid phase ratio and spheroidization, and is quantitatively controlled to be supplied to a molding facility such as die casting and forging.

Next, the basic operation of the continuous manufacturing apparatus of the rheology material having the above configuration will be briefly described.

The molten metal 15 dissolved from the melting furnace may be subjected to a primary electron stirring method in the thermal furnace 1, and the thermal furnace 1 uses induction coils 3 or hot wires for precise temperature control in consideration of the ambient temperature. Is possible. In addition, in order to supply the molten metal inside the thermal furnace 1 to the stirring tank 8 by a predetermined amount, an upper portion of the thermal furnace 1 is provided with an air supply unit 2. Therefore, a certain amount of molten metal 15 exits through the gate 4 by the pressure through the air supply unit 2 in a constant pressure state in the heat retaining furnace 1.

In addition, the molten metal 15 is cooled / warmed to a desired temperature through temperature control of the cooling device 7 or the heating device 6 in the cooling tube 5 in order to make the solid solution coexist before stirring (solid solution coexistence state). Is introduced into the stirring tank (8). The metal introduced into the stirring tank 8 is in a solid-liquid coexistence state, and is stirred by the stirrer 9 in order to obtain a fine and uniform spherical structure by applying shear force in this state.

As described above, the stirrer 9 of the present invention utilizes the shape of the rotary press jig, and applies the shear force to the solid-liquid coexisting metal in the upper and lower stirrers 17 and 18 of the rotary press jig type. It exits through the outlet 23 of the central part of the). At this time, the metal has the output of the earth together with the shear force to exit the stirring tank 8 in a fine and uniform spherical state.

In addition, it is preferable to inject nitrogen gas to prevent oxidation due to air inflow during stirring in the stirring tank (8). The metal is maintained / warmed to a constant temperature, and is cut into the outlet through quantitative control to produce a slurry 16 which can be injected into various casting machines and forging presses.

By using the apparatus according to the present invention as described above, it is possible to make a part of a predetermined shape by using the apparatus disclosed in Patent No. 0360685 or Patent No. 0227415 using a material whose crystal grain and solid phase rate are controlled from molten metal. .

Within the scope of the basic technical idea according to the present invention as described above, many other modifications will be possible to those skilled in the art. And the present invention should be interpreted based on the appended claims.

According to the present invention as described above, it can be seen that the continuous production of rheology material is possible. Therefore, by using the apparatus of the present invention, by supplying a rheology material with excellent mechanical properties continuously, it can be expected that the production of parts using a casting machine, forging press device and the like becomes more advantageous.

Claims (6)

A thermal insulation furnace which can contain the molten molten metal in the melting furnace and has an induction coil for controlling the temperature of the molten metal outside; A cooling tube connected to the gate of the heat keeping furnace, the outside having a heating device and a cooling device; A stirring tank connected to the cooling pipe and having an induction coil installed therein for temperature control; A stirrer installed inside the stirring tank and rotating by a driving source; A discharge pipe connected to an outlet of the stirring tank and provided with an induction coil for temperature control; And And a cutting device capable of cutting the metal in the solid-liquid coexistence coming out through the discharge tube to a predetermined length. According to claim 1, The cutting device, A continuous manufacturing apparatus of rheologic material comprising a hydraulic cylinder and a cutter reciprocating by the hydraulic cylinder. The stirrer of claim 1 or 2, wherein An upper stirrer having a plurality of symmetrically formed gates, It is installed at a predetermined interval with the upper stirrer, the lower portion of the central stirrer having an outlet, and It is formed in the center of the bottom surface of the upper stirrer, continuous manufacturing apparatus of rheologic material, characterized in that it comprises a screw for discharging the metal to the outlet. 4. The apparatus of claim 3, wherein a blade protruded upward is formed at one side of the upper gate of the upper stirrer to introduce metal into the gate. The apparatus of claim 3, wherein the gate is formed to be inclined backward with respect to the rotation of the upper stirrer. The continuous manufacturing apparatus of rheologic material according to claim 3, wherein nitrogen gas is filled in the stirring tank.

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