KR20150117448A - Mould for continuous casting of billet - Google Patents

Mould for continuous casting of billet Download PDF

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Publication number
KR20150117448A
KR20150117448A KR1020140042915A KR20140042915A KR20150117448A KR 20150117448 A KR20150117448 A KR 20150117448A KR 1020140042915 A KR1020140042915 A KR 1020140042915A KR 20140042915 A KR20140042915 A KR 20140042915A KR 20150117448 A KR20150117448 A KR 20150117448A
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KR
South Korea
Prior art keywords
mold
billet
cooling water
molten metal
continuous casting
Prior art date
Application number
KR1020140042915A
Other languages
Korean (ko)
Inventor
구본영
Original Assignee
주식회사 케이텍
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Application filed by 주식회사 케이텍 filed Critical 주식회사 케이텍
Priority to KR1020140042915A priority Critical patent/KR20150117448A/en
Publication of KR20150117448A publication Critical patent/KR20150117448A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds

Abstract

The present invention relates to a mold for continuous casting of a billet, which is a cheap mold used in a continuous casting machine to continuously cast the billet such as aluminum to allow lubricant and coolant to be uniformly and stably entered to improve the quality of the billet and productivity. The mold for continuous casting of the billet, as suggested to resolve the problem above, forms a securing ring (12) protruding to an external diameter of an upper part of a cylindrical mold body (11) and having several fastening holes (12a) formed therein, and forms a hanging ring (13) protruding to an external diameter of a lower part thereof. A pouring groove (14) circularly connected to an upper surface of the securing ring (12) formed on the upper part of the mold body (11) is formed, wherein several oil supply holes (15) to communicate with the inside of a mold (10) are formed to maintain regular intervals on a lower surface of the pouring groove (14). A pouring space (16) to pour the coolant is formed by widely extending the external diameter of the lower part of the mold body (11), wherein several coolant supply holes (18) are formed on an inclined part (17) on which the extended part is formed to be inclined, and an internal diameter surface (11a) of the mold body (11) is configured to be inclined to widen the lower part thereof.

Description

{MOLD FOR CONTINUOUS CASTING OF BILLET}

More particularly, the present invention relates to a mold for continuous casting of billets, and more particularly to a mold for continuous casting of billets such as aluminum, in which the inflow of lubricating oil and cooling water is uniformly and stably introduced, To a mold for continuous billet casting configured to improve productivity.

A continuous casting process is a manufacturing process in which a molten metal (hereinafter referred to as "molten metal") is continuously injected into a casting machine and coagulated while being cooled to make it relatively long as a billet to be a material for plastic working. It is advantageous in that the quality of the manufactured product is excellent, the production rate is high because it is a continuous process, and the casting product is directly forged or impacted, thereby reducing the material cost due to the shortening of the process.

In particular, aluminum has a low melting point (658 ° C) and is suitable for continuous casting. When the continuous casting method is used, the solidification rate is fast and the crystal grains are fine. Thus, a structure free from recrystallization or grain growth can be produced.

A metal such as aluminum or an aluminum alloy serving as a base material is injected into a melting furnace to be melted to form a molten metal and the molten metal in the ladle is supplied to a tube-shaped water-cooled mold cooled by a water- The molten metal supplied to the water-cooled mold is cooled by passing through the inside of the mold to form the aluminum billet, which is made of a rod-like aluminum billet. The thickness of the mold, the material and the shape of the mold, A difference in straightness due to the bending phenomenon occurs, which affects the quality of the billet.

Particularly, since the quality of the billet, such as the overall shape and surface roughness, of the molten metal passing through the mold varies depending on the thickness, material and shape of the mold, as well as the cooling rate and surface shape, In order to improve the bending state as well as the cooling rate and surface shape, aluminum alloy (A6061) is usually used and the wall thickness of 3 mm to 8 mm is maintained so that the low temperature of the cooling water can be delivered as quickly and uniformly as possible. 6, a mounting ring 12 protruding outward from the outer periphery at the end of the cylindrical mold body 11 and a cooling water supply hole 18 communicating with the inner diameter from the outer diameter of the mold body 11 at the central portion And a billet forming ring 11b having an inner diameter at the lower end thereof projecting obliquely at an end thereof, As the melt is uniformly solidified by the cooling water injection portion was able to pass.

However, when the molten metal is cast while passing through the inside of the mold, the molten metal comes into contact with the inner surface of the mold, and is discharged through the billet forming ring. Therefore, a part of the molten metal is solidified as it sticks to the inner surface of the mold. When the molten metal is cast, a scratch groove is formed on the surface of the billet formed by the solidified and adhered pieces on the inner surface of the mold to increase the surface defects of the billet and the molten metal is introduced into the mold inner diameter, It is not easy to supply the cooling water flowing into the ball, and if impurities or floating matters held in the cooling water are blocked by the cooling water supply hole, the cooling water can not be uniformly cooled if the cooling water supply is not uniform, It is the main cause of bending phenomenon of billets as well as surface defects.

In order to solve the above problems, a mold and a manufacturing method for continuous casting of billet 10-0925848 have recently been developed more precisely. For example, air and air are injected into the air inlet and the oil inlet, Oil is supplied to the graphite ring side through the air supply passage and the oil supply passage, and air and oil thus supplied flow through the micropores of the graphite ring inward. Therefore, when the molten metal is supplied into the mold body and passes through the graphite ring, the molten metal is continuously supplied while being in contact with air and oil. Therefore, since the molten metal continuously injected is not in direct contact with the inner circumferential surface of the graphite ring by the air and the oil, the frictional force therebetween can be minimized, whereby the molten metal can smoothly pass through the mold body, And air and oil supplied to the graphite ring side through the air supply passage and the oil supply passage flows through the micropores of the graphite ring into the inside thereof and is contacted with the molten metal passing therethrough so that the molten metal is primarily cooled. The first cooled molten metal passes through the injection hole of the cooling water hole and is cooled secondarily by the water sprayed therefrom. Therefore, since the molten metal is cooled step by step as it passes through the graphite ring and the cooling water hole, the cast billet is uniformly and rapidly cooled.

However, this also makes it difficult to form a supply passage for supplying air and oil by the heat sinking work for forming the graphite ring or the graphite ring, and the production cost and the management cost are too high, It is not suitable for use as a mold in a water-cooled mold used in a water-cooled continuous casting process. In addition, a separate air introducing device and an o-ring input device are required to be applied to a water-cooled continuous casting device However, there is a problem that the manufacturer or the application site to which it is applied does not provide an appropriate solution to the problem.

KR Patent No. 10-0925848 KR Patent No. 10-0846425

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a blanket continuous casting apparatus which can easily be applied to a billet continuous casting apparatus, And the molten metal flows smoothly through the mold to uniformly cool the produced billet.

Particularly, by feeding the lubricating oil evenly to the inner side of the mold, it is possible to prevent the ignition due to the lubricating oil, which makes the surface of the billet produced smoothly, The water supply hole is formed with a plurality of passages on the outer diameter of the water supply hole so that the floating water retained in the cooling water can prevent the water supply hole from being clogged.

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

The billet continuous casting mold according to the present invention, which is presented as a means for solving the above problem, is characterized in that the mold for continuous casting of billets is formed with an annular ring 12 protruding at an upper end of a cylindrical mold body 11 with a plurality of fastening holes 12a, In a mold for a continuous billet continuous casting forming a retaining ring (13) projecting to a lower outer diameter;

A plurality of grooves 14 are formed in the upper surface of the seating ring 12 formed at the upper end of the mold body 11 so as to be circularly connected to the upper surface of the seating ring 12, The supply hole 15 is formed at a predetermined distance and the inflow space 16 into which the cooling water flows is extended by extending the outer diameter of the lower end of the mold main body 11 so as to form an inclined portion 17, And the inner diameter surface 11a of the mold main body 11 is inclined so as to be wider at the bottom.

At this time, the cooling water supply holes 18 are vertically formed in the inclined portion 17 so as to intersect with each other so that the external cooling water flows into the inflow space 16 uniformly. (20) formed with a large number of fine communicating holes (21) is fixed to the outer periphery of the mold body (11) by forming a fastening surface (19) at the outer lower end of the mold body (17) It is preferable to prevent the cooling water supply hole 18 from being clogged by the filter 20.

As described above, according to the present invention, lubricating oil is uniformly supplied to the inner surface of the mold, thereby supplying the lubricant oil to the side surface rather than the upper end of the formed billet to smoothly form the surface of the billet. A plurality of passageways are formed to prevent foreign matter floating in the cooling water from being filtered by the filter screen to prevent the cooling water supply port from being clogged so that the cooling water supply is uniformly distributed on the surface of the generated billet, So that the coagulation speed of the billet can be uniformly maintained to prevent the bending phenomenon occurring in the production process, thereby improving the quality of the billet produced.

Further, since the basic shape is configured to be the same as that of the conventional shape, it can be easily applied to a conventional casting apparatus without increasing the production cost and the management cost for producing the mold, And the ability to produce a variety of effects, such as expected that many are very inventive.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a structure of a mold in which a part is broken, which is a preferred embodiment of the present invention; Fig.
Fig. 2 is a configuration diagram showing a preferred embodiment of the present invention, wherein (a) is a plan view and (b) is a front sectional view.
3 is a schematic view of a continuous casting apparatus showing a preferred embodiment of the present invention.
FIG. 4 is an exemplary operational state diagram showing a preferred embodiment of the present invention. FIG.
Fig. 5 is an explanatory view showing a state of use and enlargement of a main part showing a preferred embodiment of the present invention; Fig.
6 is a sectional view showing a conventional mold structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is to be understood, however, that the detailed description of known and known techniques may be omitted to avoid obscuring the subject matter of the present invention.

3, a plurality of molds 10 are connected to each other to form a cooling water supply pipe 31 on one side of the fixed shower tube 30 to be connected to the supply pipe 31 And the lower mold 40 provided at the lower portion of each of the plurality of molds 10 is cooled by the cooling water flowing into the shower barrel 30, And the outflow plate 50 that moves to the upper and lower portions is configured to be formed inside the cooling tank 60 held by the cooling water. The molten metal melted through the melting furnace (not shown) The same amount of molten metal is supplied to each of the molds 90 through the plurality of distributing pipes 70 exposed to the lower end of the distributing cylinder 90, (10), and the flow 80 is a structure that is fed to the top a molten metal to form a billet (2) to be produced by the casting apparatus 1 is configured to uniformly flow into the inner mold 10.

4, when the molten metal 2a flows into the mold 10 through the supply pipe 31, the casting apparatus 1, which is constructed as described above, And is dropped on the upper side of the float 80 held in the mold 10. Simultaneously with this, the upper side of the lower mold 40 is guided to the inside of the mold 10 through the distribution path 81 formed in the float 80, At this time, the float 80 made of ceramic is lower than the specific gravity of the molten metal 2a, and is floated to the upper part of the molten metal 2a and directly receives the molten metal flowing through the supply pipe 31 , The drawer plate 50 is lowered at the same rate as the height of the molten metal 2a introduced into the mold 10 at the same level as the level of the molten metal 2a introduced into the mold 10 to lower the lower mold 40 to cool the molten metal 2a, (2) that maintains the same diameter as the inner diameter surface (11a) of the bush (11) It will produce.

Since the molten metal introduced into the mold 10 is cooled by the cooling water flowing into the shower tube 30 directly in contact with the outer diameter of the mold 10 to prevent the mold 10 from being heated, Since the cooling water is rapidly cooled by contacting the outer surface of the molten metal directly coagulated with the cooling water through the plurality of cooling water supply holes 18 formed so as to communicate the inside and the outside of the mold 1, 10), which is a structure determined according to the shape and configuration of the substrate.

That is, not only the diameter of the billet 2 is determined by the inner diameter surface 11a of the mold main body 11, but also the amount and speed at which the molten metal flows into the mold 10, The quality of the billet 2 formed through the inside of the mold 10 is determined according to various conditions such as the cooling rate of the molten metal depending on the inflow state of the molten metal. Therefore, in the present invention, the present invention can be easily applied to a conventional casting apparatus, To construct an inexpensive but highly functional mold 10;

As shown in FIGS. 1 and 2, the mold for continuous casting of billets according to the present invention is formed as a solution to the above problem by projecting an outer diameter at the upper end of a cylindrical mold body 11 and forming a plurality of fastening holes 12a In a typical mold for continuous billet casting, in which a bearing ring 12 is formed and a projecting engagement ring 13 is formed on the lower side with an outer diameter,

A plurality of injection grooves 14 are formed in the upper end surface of the mounting ring 12 formed at the upper end of the mold body 11 so as to be circularly connected to the mold main body 11, The oil supply hole 15 is formed at a predetermined distance and the inner diameter surface 11a of the lower end of the mold body 11 is widened to form an inflow space 16 into which the cooling water flows, A plurality of cooling water supply holes 18 are formed in the inclined portion 17 formed so as to be inclined and connected to the mold main body 11 and the inner diameter face 11a of the mold main body 11 is inclined so as to be wider .

The cooling water supply hole 18 is formed to communicate between the outside of the mold main body 11 and the inflow space 16 into which the cooling water flows and is formed in the inclined portion 17 as a vertically- And a plurality of microcommunicating holes 21 are formed by forming a coupling surface 19 at the lower end of the seating ring 12 and the lower end of the inclined portion 17, It is desirable to fix one screen 20 to the outside of the mold body 11 so as to prevent impurities floating inside the cooling water from being filtered by the screen 20 so as to prevent the cooling water supply hole 18 from being clogged.

As described above, the basic structure of the mold 10 is formed in the upper end of the cylindrical mold body 11 with the outer diameter, and the mounting ring 12 having the plurality of fastening holes 12a is formed. The casting apparatus 1 is constructed in the same manner as the conventional structure for forming the holding ring 13 so that the casting apparatus 1 can be easily applied without any additional apparatus to the casting apparatus 1, It is an advantage that the quality of the billet 2 can be improved by replacing the mold 10, which is the most frequent consumable, and the whole life of the casting apparatus can be extended.

A plurality of injection grooves 14 are formed in the upper surface of the mounting ring 12 formed at the upper end of the mold body 11 so as to be circularly connected to the mold body 11, The oil supply hole 15 of the lubricating oil 15 is formed at a predetermined distance so as to prevent the molten metal directly flowing into and contacting the inside of the mold body 11 from adhering to the inner diameter surface 11a. The molten metal is uniformly distributed on the inner circumferential surface 11a of the mold main body 11 while facilitating the injection so that the surface of the billet 2 formed while the molten metal solidifies and moves down can be effectively maintained. (2) It prevents the lubricating oil supplied during casting process from flowing into the upper part of the molten metal to prevent the fire from occurring in the lubricating oil due to the high temperature molten metal, thereby preventing the consumption of lubricating oil due to fire It is a very important configuration that guarantees the safety of workers. (See the enlarged view of Fig. 5)

The inflow space 16 is formed by extending the inner diameter surface 11a of the lower end of the mold body 11 so as to allow the cooling water to flow therethrough so that the upper end of the inflow space 16 is formed to be inclined and connected to the mold body 11. [ A plurality of cooling water supply holes 18 formed in the inclined portion 17 are formed so as to communicate the outside of the mold main body 11 and the inflow space 16 into which the cooling water flows, So that the cooling water that maintains the constant pressure introduced into the shower casing 30 can be easily introduced into the inflow space 16 through the plurality of cooling water supply holes 18 and then quickly discharged to the lower portion The cooling water can be rapidly sprayed on the entire outer surface of the same circumference of the billet 2 formed by solidification of the molten metal so that the cooling of the billet 2 can proceed rapidly and evenly so that the billet 2 It is possible to prevent the phenomenon of twisting or bending in the cooling process, thereby preventing defects of the billet 2 and improving the quality thereof (see also the enlarged view of FIG. 5)

At this time, a clamping surface 19 is formed at the lower end of the mounting ring 12 and the lower end of the inclined portion 17 to keep the sieve 20 having the large number of the micro-communicating holes 21 at the outer diameter of the mold main body 11 So that impurities floating inside the cooling water flowing into the shower canister 30 are filtered by the screen 20 to prevent the cooling water supply hole 18 from being clogged.

That is, when some of the cooling water supply holes 18 of the plurality of uniformly configured cooling water supply holes 18 become clogged, the supply of cooling water to the cooling water supply holes 18 of the clogged portion is stopped, Since the cooling water can not be supplied to the surface of the billet 2, in order to prevent this, impurities are first filtered in the communication hole 21 having a diameter smaller than the diameter of the cooling water supply hole 18, The impurities passing through the cooling water supply hole 18 naturally pass through the cooling water supply hole 18 and the impurities that have escaped from the cooling water supply hole 18 are discharged naturally to the lower portion of the inflow space 16 In addition, even if some of the communication holes 21 of the sieve 20 maintaining a large area are blocked by the impurities, the cooling water flowing through the remaining communication holes 21 can uniformly supply the cooling water to the plurality of cooling water supply holes 18. [ The acid by cooling water to all the cooling water supply hole 18, it can be seen that uniformly supplied.

The inner wall surface 11a of the mold body 11 is tilted so as to be wider so that the molten metal flowing into the mold 10 is in contact with the inner diameter surface 11a of the mold body 11, The outer diameter of the billet 2 moving downward is not brought into contact with the inner diameter surface 11a of the mold main body 11 to improve the mobility and the outer diameter surface of the billet 2 It is a useful structure for forming uniformly.

As described above, the present invention is a mold 10 that can be easily applied to a casting apparatus for continuous casting of billets to be used in the conventional manner, The shape of the billet can be uniformly applied to the conventional casting apparatus without increasing the production cost and the management cost for producing the mold. So that the cooling rate is maintained to be the same in the same cross-sectional area, so that the coagulation speed of the billet is uniformly maintained, thereby preventing the bending phenomenon occurring in the production process, thereby improving the quality of the billet produced.

1: casting device 2: billet
2a: molten metal 10: mold
11: Mold body 11a: Inner diameter face
12: seat ring 13: latch ring
14: injection groove 15: oil supply hole
16: inflow space 17: inclined portion
18: cooling water supply hole 19: fastening surface
20: Filter wire 21:
30: Shower tub 31: Supply pipe
40: lower mold 50: drawer plate
60: cooling tank 70: distribution pipe
80: Float 81: Distribution line
90: Distribution box 91:

Claims (3)

A mold for continuous billet casting according to any one of claims 1 to 3, wherein the recessed ring (12) is formed at the upper end of the cylindrical mold body (11) with an outer diameter and the projecting engagement ring (13) is formed at the lower end thereof.

A plurality of injection grooves 14 are formed in the upper end surface of the mounting ring 12 formed at the upper end of the mold body 11 so as to be circularly connected to the mold main body 11, The oil supply hole 15 is formed at a predetermined distance and the inclined portion 17 is formed so as to form an inflow space 16 through which the cooling water flows in by extending the outer diameter of the lower end portion of the mold body 11 Wherein a plurality of cooling water supply holes (18) are formed, and an inner diameter surface (11a) of the mold main body (11) is inclined so as to widen the bottom.
The method of claim 1, further comprising:

A fastening surface 19 is formed to protrude from the outer periphery of the mold main body 11 at the lower end of the mounting ring 12 and the lower end of the outer periphery of the inclined portion 17 to fasten the screen 20, Wherein the mold (20) is fixed to the surface (19) so that the molten metal (20) is kept at a constant distance from the outer surface of the mold body (11). The method of claim 1, further comprising:

Wherein the cooling water supply holes (18) formed in the inclined portion (17) are formed as upper and lower double, and the cooling water is uniformly introduced into the inflow space (16) by crossing each other.
KR1020140042915A 2014-04-10 2014-04-10 Mould for continuous casting of billet KR20150117448A (en)

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KR1020140042915A KR20150117448A (en) 2014-04-10 2014-04-10 Mould for continuous casting of billet

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200074622A (en) * 2018-12-17 2020-06-25 주식회사 포스코 Mold

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200074622A (en) * 2018-12-17 2020-06-25 주식회사 포스코 Mold

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