KR100673618B1 - Manufacturing apparatus for casting semi-solid materials and process method thereof - Google Patents

Abstract

A semi-solid metal manufacturing apparatus comprising a generation equipment for making initial granular crystals very economically and highly efficiently, and a method for manufacturing a semi-solid metal using the same are provided. An apparatus for manufacturing a semi-solid metal comprises: a metal melting equipment in which a melting crucible(203) is embedded, which has a tapping path heater(302) mounted tapping pipe(301), and which controls an amount of molten metal discharged by vertical movement of a hot top rod(101) for discharging molten metal; a granular primary crystal generating equipment which is installed at an output side of the metal melting equipment, and comprises a cooling water circulation pipe installed on an outer surface of a semicircular pipe with a predetermined length, a cooling water circulation pipe protecting casing installed at an outer side of the cooling water circulation pipe, and an inclined cooling plate(40) having multi-joint angle-adjusting links mounted on the center, the front and the rear thereof; and an ordinary water cooling type drawing equipment(60) installed at an output side of the granular primary crystal generating equipment to manufacture the semi-solid metal by injecting a granular primary crystal into a lower holding furnace(50) through the inclined cooling plate.

Description

Manufacturing apparatus for semi-solid metal and manufacturing method of semi-solid metal

1 is a partial longitudinal cross-sectional view of a continuous casting semi-solid metal manufacturing apparatus according to an embodiment of the present invention,

2 is a plan view of a continuous casting semi-solid metal manufacturing apparatus according to an embodiment of the present invention,

3 is a partial cross-sectional perspective view of the water-cooled gradient cooling plate for granular primary generation generation control of the present invention;

4 is a plan view and a right side view of a water-cooled drawing system generally used in the casting process.

 <Explanation of symbols for main parts of drawing>

10: tapping unit 101: pressure rod

102: pressure rod transfer mechanism 103: geared motor

20: upper melting furnace 201: molten metal

202: ceramic heater 203: melting crucible

30: tapping 301: tapping

302: hot water heater 40: water cooling gradient cooling plate

402: joint angle of inclination adjustment link 403: cooling water circulation pipe

405: protective casing 50: lower holding furnace

501: semi-solid metal 502: ceramic heater

503: metal outlet pipe 60: water-cooled drawing device

601: cooling water injection nozzle 602: cooling water circulation tank

603: water-cooled drawing rod 604: cooling water inlet pipe

605: cooling water discharge pipe 606: cooling water circulation tank

607: coolant inlet pipe 608: coolant discharge pipe

      609: dummy bar 70: drawing rod transfer mechanism

      701: guide rail 702: transport chain

703: Chain Drive Motor

The present invention relates to a device for producing a semi-solid metal and a method for producing a semi-solid metal, using a water-cooled gradient cooling plate in the initial stage of the initial cooling process in which the molten metal is cooled using a granular primary generation device After the production of the semi-solid metal to maintain a constant temperature for a certain time at a constant temperature, and after a certain time in the lower holding passage is discharged through the outlet pipe to the semi-solid metal to be continuously produced through the drawing device and A method for producing a semisolid metal.

Semi-solid metal processing requires a metallic raw material with granular crystals to determine the initial particles.

In the semi-solid metal production method, a slurry having a relatively fine granular structure by stirring the molten metal in a region where a solid and a liquid coexist, thereby inhibiting the formation of dendrite and activating granular crystals. Slury).

However, this method requires long time stirring to obtain atmosphere control and granular crystals in the furnace to prevent contamination and oxidation of molten metal during the stirring process, and temperature control for maintaining coexistence of solid and liquid. Because of the need for additional equipment and time, there was a disadvantage that the manufacturing cost is expensive.

On the other hand, starting with the rheocasting method developed by MC Flemings in the early 1970s, many studies on the improvement of the microstructure and mechanical properties of metals in the semi-solid process have been conducted. It is becoming.

Recently, the technical trend is that the semi-solid machining method requires structural defects such as pores and segregation of the casting material, and high stress in forming the forging material, and it is very difficult to manufacture complex shaped parts. This is because the disadvantages can be minimized.

The semi-solid processing method is a method of heating mixed solid particles and processing them in a semi-melted state, as in powder sintering or processing at high temperature, and cooling liquid phases such as forging of semi-solid molten metal or by casting to coexist solid and liquid. It is largely divided into a method of processing in the state of holding.

Therefore, the semi-solid machining method is a new machining method combining the casting process and the hot machining process.

In order to perform the semi-solid processing method, a metallic material having granular primary crystals is essential, and there are mechanical stirring methods and electromagnetic stirring methods for producing slurry and billet of the metal alloy.

The mechanical stirring method has remained at the basic experimental stage performed as a comparatively small scale experimental apparatus up to now, but has recently been progressing in the direction of developing a practical apparatus and gradually realizing it.

However, in spite of the advantage that the mechanical stirring method can obtain a fine and spherical structure due to the relatively high deformation rate, the contamination of the melt due to the erosion of the agitator in the melt and the overall process control It has the disadvantage of low productivity in terms of difficulty and economics.

On the other hand, the electromagnetic stirring method prevents the involvement of impurities because there is no contact between the liquid metal and the stirrer, the strength of the stirring is easily controlled, and the entire molten metal has a liquid flow, so that the liquid-liquid coexistence region (solid It has the advantage that the stirring in the liquid coexistence zone (Mush Zone) can be performed efficiently.

However, there is a problem that the manufacturing cost of the semi-solid metal is too high because the electromagnetic stirring action requires a huge amount of power consumption to be sufficiently delivered to the inside of the molten metal in the stirring vessel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus for producing semi-solid metal, which is very economical and highly efficient for producing a device for making an initial granular crystal.

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Another object of the present invention is a manufacturing method by crystallized glass snow, in which a semi-solid metal is formed in a granular solid crystal obtained by passing a molten metal melted in a melting furnace through a gradient cooling plate, and then a semi-solid metal is continuously used by using a water-cooled drawing device. It is to provide a device for producing a semi-solid metal and a method for producing a semi-solid metal that can be produced by.

In order to achieve the above object, the apparatus for producing a semi-solid metal of the present invention has a tapping tube in which a melting crucible is embedded, a tapping heater is installed, and the amount of molten metal discharged by the up / down movement of a molten metal pressure discharge rod. The metal melting device for adjusting the, and the cooling water circulation pipe is installed on the outer side of the semi-circular tube having a predetermined length, which is located on the output side of the metal melting device, the cooling water circulation pipe protective casing is installed outside the center before and after Is manufactured by a water-cooled drawing apparatus, which is installed in succession of the granular priming generating device comprising an inclined cooling plate equipped with an articulated angle adjusting link, and which is installed at the output side of the granular priming generating device and is introduced into the lower holding through the inclined cooling plate. It is characterized by.

In addition, the method for producing a semi-solid metal of the present invention is a melting step of dissolving the metal through a known upper melting furnace, and the pressure of the hot rod in proportion to the amount of the molten metal dissolved in the dissolution step to the draw through the lower holding furnace The upper surface of the inclined cooling plate cooled by the cooling water circulated along the conduit of the cooling water circulation pipe, and the angle is changed by the extrusion process extruded while maintaining the constant descent speed by the hot rod transport mechanism, and the articulated angle adjustment link. In the first step to continuously drop the molten metal extruded in the extrusion process by the appropriate amount to generate a granular primary crystal produced during the initial solidification process of the molten metal, and the semi-solid metal produced by the primary solidification process at a constant temperature in the lower holding furnace After a certain period of time in the That the pull-out device consisting of a water-cooled casting and drawing rods complete process for preparing a semi-solid metal in the predetermined shape by the feeding mechanism is characterized.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted when they may distract from the gist of the present invention.

1 is a partial longitudinal cross-sectional view of a continuous casting semi-solid metal manufacturing apparatus according to an embodiment of the present invention.

The present invention is composed of a base (21) for supporting the upper melting furnace 20 and a support (23) for supporting the lower holding furnace (50) in which the semi-solid metal dissolved in the upper melting furnace 20 is accommodated. .

The upper melting furnace 20 fixed on the base 21 has a melting crucible 203 therein and a ceramic heater 202 wound thereon.

A tapping part 10 is fixed to an upper part of the upper melting furnace 20, and a geared motor 103 is mounted on a fixed stand installed on one side of the tapping part 10, by the geared motor 103. The pressure rod conveyance mechanism 102 is comprised so that it may move up and down.

At this time, it can be moved up and down through a belt or a gear fixed to the rotating shaft of the geared motor 103, it can be sufficiently realized by a conventional drive device.

One side of the pressure rod transfer mechanism 102 is fixed to the pressure rod 101 is configured to move up and down in accordance with the lifting of the pressure rod transfer mechanism (102).

When the pressure rod 101 is inserted into the melting crucible 203, the molten metal 201 melted in the melting crucible 203 is discharged to the outside by its weight and pressure.

The tapping furnace 30 is formed on the other side of the upper melting furnace 203, and the heater 302 is wound outside the tapping furnace 30.

The molten metal 201 discharged through the tapping furnace 30 generates granular crystals by means of crystal generating means. The crystal generating means includes a water-cooled inclined cooling plate 40 and an inclined articulated angle adjusting link 402. have.

The articulated tilt angle adjusting link 402 includes an angle adjusting member (not shown).

The articulated tilt angle adjusting link 402 is mounted on the base 21, and when the angle adjusting member is constituted by a screw, the screw is fixed to the engaging portion of both articulated tilt angle adjusting links 402 to fix the screw. Rotation can be adjusted to maintain a constant angle, the present invention is not limited to this, it can be applied to various other embodiments, by changing the angle up to 70 degrees by the angle adjustment member is used.

Water-cooled inclined cooling plate 40 is made of a copper plate and has a cooling water circulation pipe 403 at the bottom, it is shown in more detail in FIG.

3 is a partial cross-sectional perspective view of the water-cooled gradient cooling plate for granular primary crystal generation control of the present invention.

The inclined cooling plate 40 is formed in a semi-circular arc shape in order to increase the cross-sectional area, and the cooling water circulation pipe 403 is attached to the lower portion of the inclined cooling plate 40 and is evenly spaced below the inclined cooling plate 40 in a zigzag structure. It is fixed. In addition, in order to protect the cooling water circulation pipe 403, the cooling water circulation pipe 403 is arrange | positioned in the protective casing 405.

When the device for blocking the inflow of dust and foreign matter is installed on the upper side of the inclined cooling plate 40 formed in the semi-circular shape can produce a semi-solid metal from which impurities are removed.

The inclined cooling plate 40 has a semi-circular arc shape, so that the molten metal 201 melted in the melting crucible 203 falls on the inclined cooling plate 40 and slides by gravity to generate granular crystals.

When the coolant circulation pipe 403 is not installed in the inclined cooling plate 40, the material of the inclined cooling plate 40 may be cooled using ceramic or non-ferrous metal.

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In the lower holding furnace 50 into which the granular priming generated metal flowing down from the inclined cooling plate 40 of FIG. 1 flows in a semi-solid state, a furnace is formed therein, and a ceramic heater 502 is wound around the furnace. It is. And the inclined metal outflow pipe 503 is formed at one side of the lower holding passage 50, and the metal is continuously cast by the conventional water-cooled drawing device 60.

4 shows a plan view and a right side view of a water-cooled drawing apparatus generally used in a casting process.

The water-cooled drawing device 60 is fixed through the metal outlet pipe 503, and the water-cooled drawing device 60 is generally used in metal casting.

The water-cooled drawing device 60 is fixed to the dummy bar 609 in the center, the draw bar 603 is formed on the opposite surface of the dummy bar 609 is formed with a draw rod cooling water circulation tank 606, A cooling water circulation tank 602 for drawing die is fixed to the outside of the water-cooled drawing device 60. Reference numeral 601 denotes a coolant spray line, and 605 and 608 denote coolant discharge lines.

The water-cooled drawing device 60 obtains the metal drawn together with the drawing bar 603 while pulling the drawing bar 603 for the semi-solid metal supplied through the dummy bar 609, and the drawing bar conveying mechanism 70. Is shown in more detail in FIG. 2.

2 is a plan view of a continuous casting semi-solid metal manufacturing apparatus according to an embodiment of the present invention, it is a plan view of FIG.

The water-cooled drawing rod 603 is fixed through the connecting rod 61, and the connecting rod 61 is configured to be movable left and right through a pair of guide rails 701.

A transfer chain 702 is engaged with the connecting rod 61, and the transfer chain 702 is configured to be driven by a chain drive geared motor 703.

When explaining the operation and effect of the present invention configured as described in the semi-solid metal as follows.

First, in the melting process of dissolving a known metal, the upper melting furnace 20 is heated by the ceramic heater 202 to maintain the molten metal therein.

As such, the molten metal flows out into the tapping tube 301 through the extrusion process, and falls to the water-cooled inclined cooling plate 40 and flows out into the water-cooled drawing device 60 through the lower holding path 50. In proportion, the pressure rod 101 is lowered by the pressure rod transfer mechanism 102 while maintaining a constant downward speed.

That is, the pressure rod rod 102 is lifted and lowered by the upper geared motor 103 so that the pressure rod 101 is lifted and lowered so that the pressure rod 102 is put in the melting crucible 203 and the weight thereof. As a result, the molten metal 201 is discharged.

In the following primary production process, the inclination angle of the inclined cooling plate 40 is fixed by determining the desired inclination angle by the articulated inclination angle adjustment link 402.

The inclined cooling plate 40 continuously and appropriate amount of the molten metal 201 on the upper surface of the inclined cooling plate 404 forming a semicircular arc cooled by the cooling water circulated by the cooling water circulation pipe 403 in the lower portion. Dropping is carried out in the early stage of solidification of molten metal to run out of semi-solid metal.

As described above, the crystal formed in the semi-solid form using the inclined cooling plate 40 passes through the inclined cooling plate 40, and the crystal glass growth of the first crystal is continuously generated. As the angle of the inclined cooling plate 40 decreases, The rate at which the molten metal flows down the inclined cooling plate 40 is reduced, so that the cooling effect by the inclined cooling plate is increased due to the contact over a relatively long time, and in the case of a large angle, the contact time with the inclined cooling plate 40. The cooling effect due to the shortening of is reduced.

As such, the higher the injection temperature, the higher the injection temperature, the coarsening of the tablet occurs due to the decrease of the cooling rate. As a result, the coarse growth of the coarsened tablet may occur. As a result, the growth of the tablets is shortened, which causes a decrease in solid phase rate.

And after maintaining the semi-solid metal produced in the primary production process for a predetermined time at a predetermined temperature in the lower holding furnace 50, the water-cooled drawing device 60 for the semi-solid metal 501 controlled by the primary through the outlet pipe 503 Drain) into the drawing die.
At this time, the water-cooled drawing bar 603 equipped with the dummy bar 609 blocks the outflow of the semi-solid metal 501 flowing out to the drawing die.

At this time, the coolant is introduced into the coolant circulation tank 602 from the coolant inlet pipe 604 and discharged through the coolant discharge pipe 605. At this time, the drawing rod 603 is also cooled inlet pipe 607 as in the case of drawing die. Since the cooling water is circulated through the discharge pipe 608 and the drawing bar coolant circulation tank 606, the drawing die, the drawing bar 603, and the dummy-bar 609 are cooled, and thus the semi-solid metal flowing out to the drawing die portion ( 501 and the cooled dummy-bar 609 are coupled while contacting each other so that solidification proceeds rapidly.

At this time, the drawing rod 603 supported by the guide rail 701 is gradually drawn out of the rod-shaped semi-solid metal in accordance with the drive of the transfer chain 702 driven by the chain drive geared motor 703 and at the same time the coolant injection nozzle Cooling water is injected from 601 to perform a casting completion process to complete casting of a certain shape.

In this way, when the cooling water injected from the cooling water injection nozzle 601 through the drawing die is cooled below a predetermined temperature, the injection and circulation of the cooling water is stopped, and a semi-solid metal in a cast-finished state of a cylindrical shape is manufactured.

As described above, the present invention can continuously manufacture the semi-solid metal by controlling the initial generation process of the initial cooling of the molten metal when the molten metal is cooled when the granular primary crystal is formed for the initial determination of the particle shape. The manufacturing apparatus is mainly composed of an upper melting furnace for dissolving metal and a tapping system capable of discharging molten metal from the crucible, a water-cooled gradient cooling plate capable of controlling the amount and form of granular supergeneration, and an initial cooling generated through the gradient cooling plate. The semi-solid metal to maintain the included semi-solid metal for a certain time at a constant temperature, the semi-solid metal can be produced by a water-cooled drawing device that is discharged through the outlet pipe after a certain time in the lower holding furnace.

Such a semi-solid metal will have the following features and possibilities of processing.

  [Features of Processing]

 ① It is possible to remove casting defects such as internal defects and segregation.

 ② microstructure can be obtained.

③ It is possible to manufacture parts that cannot be manufactured by the conventional casting method.

 ④ The life of the device is increased.

[Possibility of Processing]

(1) Because the deformation resistance is very low, it is possible to achieve a large processing rate with a small processing force, thereby minimizing and increasing the efficiency of processing machines and facilities.

② Saving energy resources by shortening the processing process and improving the material recovery rate.

③ Mass production of long, thin and small-sized eggs.

 ④ It is possible to improve parts' performance and lifespan by improving mechanical properties and suppressing internal defects.

 ⑤ Reduction of heat energy by heating and cooling during metal processing.

⑥ Possible to manufacture small size material with good hot and cold workability.

Claims (6)

The melting crucible 203 has a built-in, the tapping pipe 301 is provided with a tapping furnace heater 302, by adjusting the amount of molten metal discharged by the up and down movement action of the pressure discharge rod 101 for discharging the molten metal Metal melting apparatus,   Located on the output side of the metal melting device, the cooling water circulation pipe 403 is installed on the outer surface of the semi-circular pipe 401 having a predetermined length, the cooling water circulation pipe protective casing 405 is installed to the outside of the center And, after the granular primary generation generating device consisting of the inclined cooling plate 40 equipped with the articulated angle adjustment link, Semi-solid, characterized in that the semi-solid metal is produced by the conventional water-cooled drawing device 60 is installed in succession to the output side of the granular primary generation device, and introduced into the lower holding passage 50 through the inclined cooling plate (40). Metal manufacturing apparatus. 2. The apparatus for producing a semi-solid metal according to claim 1, wherein the semi-circular tubular inclined cooling plate (40) is made of ceramic. 2. The apparatus for manufacturing a semi-solid metal according to claim 1, wherein the semi-circular tubular inclined cooling plate (40) is made of nonferrous metal. delete delete A dissolving process of dissolving a metal through a known upper melting furnace 20; While the molten metal 201 melted in the dissolution process is proportional to the amount of outflow to the drawing portion through the lower support passage 50, the pressure rod 101 maintains a constant dropping speed by the pressure rod transfer mechanism 102. Extrusion process to extrude, The molten metal is extruded in the extrusion process on the upper surface of the inclined cooling plate 40 is cooled by the cooling water circulated along the pipeline of the cooling water circulation pipe 403, the angle is changed by the articulated tilt angle adjustment link 402 A crystal forming step of producing a granular tablet produced during the initial solidification process of molten metal by continuously dropping 201 in an appropriate amount;  After maintaining the semi-solid metal produced by the primary fertility process at a predetermined temperature in the lower holding furnace 50 for a predetermined time, the semi-solid metal 501 controlled by the crystallization through the metal outflow pipe 503 known water-cooled drawing device ( 60) and the method for producing a semi-solid metal, characterized in that the casting completion process for producing a semi-solid metal of a predetermined shape by the draw bar transfer mechanism 70

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