EP3517231A1

EP3517231A1 - Molds, mold sets and casting apparatus

Info

Publication number: EP3517231A1
Application number: EP16886819.8A
Authority: EP
Inventors: Dong Hoon Yeo
Original assignee: Samjung Jps Co Ltd
Current assignee: Samjung Jps Co Ltd
Priority date: 2016-09-23
Filing date: 2016-09-27
Publication date: 2019-07-31
Also published as: WO2018056489A1; EP3517231A4; KR101754067B1

Abstract

It is an object of the present disclosure is to provide a mold, a mold set and a casting apparatus configured to easily discharge ferro silicon or ferro manganese free from generation of condensations formed with foreign objects, wherein the casting apparatus includes: a distributor distributing a molten ferrosilicon or ferro manganese; a mold part including a plurality of mold sets receiving the distribution of the molten ferrosilicon or ferro manganese from the distributor; and a feeding part feeding the mold part by passing from a first curved part and to a second curved part in a closed-circulative loop, wherein the molten ferrosilicon or ferro manganese cooled by the mold part is discharged from the first curved part, and wherein a mold set includes: a molder holder; anda plurality of molds arranged by being coupled to the mold holder, wherein the mold may be centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.

Description

[Technical Field]

The teachings in accordance with exemplary and non-limiting embodiments of this disclosure relate generally to a mold, a mold set and a casting apparatus, and more particularly to a mold, a mold set and a casting apparatus configured to ease the discharge of ferro silicon or ferro manganese.

[Background Art]

Steel is manufactured by being inserted with lots of additives, using an iron as a base, and possesses various physical properties and attributes in response to composition ratio of additives. At this time, the additives are occasionally inputted as pure substances and in a case of some additives, steel is inserted as ferro type additives. The ferro type additives are mixed with steel and relevant additives, and representatives thereof are ferrosilicon and ferromanganese.
Inter alia, the most frequently used additive is the ferrosilicon, where the ferrosilicon means a mixture of steel and silicon. Although the ferrosilicon has various industrial usages but the representative use is for use in the steel manufacturing process. Hereinafter, although the ferrosilicon among ferro type additives is to be explained, other ferro type additives also have the same physical properties.
Meantime, although silicon can be also used for improvement of iron, and because the silicon is inserted through the ferrosilicon, management of contents of ferrosilicon is one of the important elements in the steel manufacturing process, and the ferrosilicon is manufactured by various methods. A representative method may be the conventional method of manufacturing by mixing mild steel and silicon. The above method may have an advantage of using steel wastes, and the manufacturing method is relatively simple to its advantage.
Now, in the manufacturing method of ferro type additive utilized in the steelmaking process, the ferro type additive manufactured by an outside process is melted through a melting furnace. When the melting of ferro type additive is completed, a mold formed in a single frame is inserted with molten ferro type additive to be cast in a single square type flat plate. The mold is destructed using an excavator before putting the cast-finished ferro type additive flat plate into steel manufacturing process, and finishing the ferro type additive input process by inputting into the steelmaking process.
However, this type of method is disadvantageous in that it cannot generate a predetermined constant size of piece during destruction of the ferro type additive flat plate, and ferro type additive powder is generated during the destruction. Particularly, another disadvantage is that small pieces and powders may be inputted into the process, resulting in material loss and bad economic efficiency, although it is known that the efficiency is excellent within a predetermined size of scope when the ferro type additives are inputted into the steelmaking process.
In order to solve the aforementioned disadvantages, such technology as disclosed in the Korean Registered Patent No.: 10-1605889 (hereinafter referred to as "prior art") has been developed. The prior art disclosed a ferro type additive casting apparatus configured to cast each piece of plurality of ferro type additives having a predetermined size of pieces using a mold set capable of forming a plurality of unit molds, and further configured to allow a contact part of unit mold to be opened during discharge of each piece by a sprocket.
Although the prior art has an advantageous structure capable of easily discharging the ferro type additives because of opened unit mold, there may be condensations formed with foreign objects condensed at corners of casting apparatus by permeation of molten ferro type additives between contact gaps, because of coupling members contacted by several members (front lateral bulkhead, rear lateral bulkhead, central bulkhead). Furthermore, andherence of molten ferro type additives may be generated because of the unit molds being of metal materials.

[Detailed Description of the Invention]

[Technical Subject]

The present disclosure is provided to solve the aforementioned disadvantages of the prior art, and it is an object of the present disclosure is to provide a mold, a mold set and a casting apparatus configured to easily discharge ferro silicon or ferro monganese free from generation of condensations formed with foreign objects.

[Technical Solution]

A mold according to the present disclosure in order to accomplish the technical solution may be centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.
In one general aspect of the present disclosure, there is provided a mold centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.
Preferably but not necessarily, the cavity may be made with a stone material, and include a first groove, and a second groove connected to the first groove and extended from the first groove to an outside, wherein depth of the first groove may be deeper than that of the second groove.
Preferably but not necessarily, the first groove may take a hemispherical shape, a cross-section of the second groove may take a round shape with an apex portion being cut in a straight line, and the size of the second groove may grow smaller as depth grows deeper, and a minimum cross-section of the second groove may be greater than a maximum cross-section of the first groove.
Preferably but not necessarily, the stone material may be Al₂O₃-SiC-C, SiC-C or carbon (C).
Preferably but not necessarily, a melting point of the stone material may be greater than 3000°C.
Preferably but not necessarily, coefficient of thermal expansion of stone material may be more than 3.3×10^-6/°C but less than 6.0×10^-6/°C.
In another general aspect of the present disclosure, there is provided a mold set, the mold set comprising:
a molder holder; and
a plurality of molds arranged by being coupled to the mold holder, wherein the mold may be centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.
In another general aspect of the present disclosure, there is provided a casting apparatus, the casting apparatus comprising:

a distributor distributing a molten ferrosilicon or ferro manganese;
a mold part including a plurality of mold sets receiving the distribution of the molten ferrosilicon or ferro manganese from the distributor; and
a feeding part feeding the mold part by passing from a first curved part and to a second curved part in a closed-circulative loop, wherein
the molten ferrosilicon or ferro manganese cooled by the mold part is discharged from the first curved part, and wherein
a mold set comprising:
a molder holder; and
a plurality of molds arranged by being coupled to the mold holder, wherein the mold may be centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.

Preferably but not necessarily, the feeding part may include:

a first sprocket;
a second sprocket; and
a chain set circulating in a closed-circulative loop by forming a first curved part by being coupled with the first sprocket, and forming a second curved part by being coupled with the second sprocket.

Preferably but not necessarily, a neighboring mold set may be distanced from the first curved part.

[Advantageous Effects of the Disclosure]

The present disclosure can advantageously provide a mold, a mold set and a casting apparatus configured to easily discharge each piece of ferrosilicon or ferro manganese condensed by the materialistic properties of stone mold because there exists no condensations (structural gap) from which foreign objects may be generated.

[Brief Description of Drawings]

FIG. 1 is a schematic structural view of a casting apparatus according to an exemplary embodiment of the present disclosure.
FIG. 2 is a schematic perspective view illustrating a feeding part and a mold part according to an exemplary embodiment of the present disclosure.
FIG. 3 is a schematic perspective view illustrating a mold set according to an exemplary embodiment of the present disclosure.
FIG. 4 is a cross-sectional view illustrating a mold according to an exemplary embodiment of the present disclosure.
FIG.5 is a cross-sectional view illustrating a grinding process of a mold according to an exemplary embodiment of the present disclosure.
FIG. 6 is a perspective view illustrating a mold set according to a modification of the present disclosure.

[BEST MODE]

Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Like reference numerals designate like elements throughout the specification, and any overlapping explanations that duplicate one another will be omitted. Accordingly, in some embodiments, well-known processes, well-known device structures and well-known techniques are not illustrated in detail to avoid unclear interpretation of the present disclosure.
Hereinafter, a structure of a casting apparatus (1000) according to the present disclosure will be described in detail.
FIG. 1 is a schematic structural view of a casting apparatus according to an exemplary embodiment of the present disclosure, FIG. 2 is a schematic perspective view illustrating a feeding part and a mold part according to an exemplary embodiment of the present disclosure, FIG. 3 is a schematic perspective view illustrating a mold set according to an exemplary embodiment of the present disclosure, FIG. 4 is a cross-sectional view illustrating a mold according to an exemplary embodiment of the present disclosure, and FIG.5 is a cross-sectional view illustrating a grinding process of a mold according to an exemplary embodiment of the present disclosure.
The casting apparatus (1000) according to the present disclosure is a casting apparatus of ferrosilicon or ferro manganese (ferro type additive), and as illustrated in FIG. 1, may include a supplier of molten metals (1), a support part (2), a distributor (100), an emergency device (200), a feeding part (300), a mold part (400), a driving device (500), a cooling device (600), and a drying device (700).
The supplier of molten metals (1) is a conventional well-known supplier of molten metals or a heat pump. The supplier of molten metals (1) may feed ferrosilicon or ferro manganese molten from a separate melting furnace. The supplier of molten metals (1) may be accommodated at an inner space with the molten ferrosilicon or ferro manganese. The supplier of molten metals (1) may input the molten ferrosilicon or ferro manganese to the distributor (100).
The distributor (100) may supply the molten ferrosilicon or ferro manganese received from the supplier of molten metals (100) to the mold part (400). The distributor (100) may take a cubic shape with a square cross-section. The distributor (100) may be formed therein with a space.
An inner space of the distributor (100) may be formed with a separation wall having a predetermined height and divided by the separation wall. Thus, even if an amount of molten ferrosilicon or ferro manganese inputted to a right side space is changed, the molten ferrosilicon or ferro manganese in a left side space can be maintained with a predetermined constant amount.
The left side space of the distributor (100) may be formed with a plurality of discharge holes (110). The molten ferro type additive supplied to the distributor (100) may be supplied to a mold part (400) through the discharge hole (110). The number of discharge holes (110) may be formed to cater to the number of molds (410) of mold set (405, described later). As a result, the molten ferrosilicon or ferro manganese supplied from the supplier of molten metals (1) may be supplied to each mold (410) by being distributed to the molds (410) through the distributor (100).
An inside of the distributor (100) may be formed with refractories. One side of the distributor (100) may be rotatably fixed (hinged) to allow being rotated to a right side when the emergency device (200, described later) is operated.
The emergency device (200) may be formed with a linear actuator. The emergency device (200) may be operated when an excessive molten ferro type additive is inputted in an inner space of the distributor (100), or when there is a problem at a device disposed thereunder. In this case, the emergency device (200) may be temporarily stopped by allowing the molten ferrosilicon or ferro manganese accommodated at an inner space to be inputted to the mold part (400) while the distributor (100) is rotated to the right side.
The feeding part (300) may be disposed at a lower side of the distributor. The feeding part (300) circulates in a closed-circulative loop by passing from the first curved part (A) to the second curved part (B). The feeding part (300) may be coupled at a periphery by the mold part. Thus, the mold part (400) integrally passes along with the feeding part (300) in a closed-circulative loop from the first curved part (A) to the second curved part (B).
The feeding part (300) may include a first sprocket (310), a second sprocket (320) and a chain set (330). The chain set (330) may be coupled (meshed) with the first sprocket (310) and the second sprocket (320) by being wound on the first sprocket (310) and the second sprocket (320), whereby the from the first curved part (A) to the second curved part (B) are formed.
The chain set (330) may circulate in a close-circulative loop by the rotating drive of the first sprocket (310) and the second sprocket (320). The first sprocket (310) and the second sprocket (320) may rotatively drive by a driving device (500). The driving device (500) is a well-known rotating actuator and may be an electric motor, for example.
The first sprocket (310) and the second sprocket (320) may be arranged in several numbers along a width direction of the feeding part (300). In the exemplary embodiment of the present disclosure, a total two (2) first sprockets (310) and second sprockets (320), each one at both ends of width direction (width direction of mold part (400) described later) of the feeding part (300) are arranged at the first curved part (A) to the second curved part (B) (sprocket at one end only illustrated). That is, two first sprockets (310) are arranged at the first curved part (A), and two second sprockets (320) are arranged at the second sprocket (B).
The first sprocket (310) may take a shape of a spur gear where a gear tooth (311) and a gear groove (312) are alternately formed along a circumference. The shape of second sprocket (320) may be analogically applied from that of the first sprocket (310).
The chain set (330) may be arranged in a plural number. In the exemplary embodiment of the present disclosure, a total of two chain sets (330), each at both ends of width direction (width direction of mold part (400) described later) of the feeding part (300). The chain set (330) may include a plurality of outside links (331), a plurality of inside links (332), a plurality of chain axles (333) and a plurality of rollers (334).
The outside link (331) and the inside link (332) are so arranged as to face each other, each being spaced apart from the other. Both ends of outside link (331) and the inside link (332) may be overlapped or stacked with both ends of neighboring outside link and inside link. Furthermore, both ends of outside link (331) and the inside link (332) may be fixed by the chain axle (333). The roller (334) may be coupled to a part of discrete space of the outside link (331) and the inside link (332), using the chain axle (333) as a rotation shaft.
The roller (334) may be accommodated into a gear groove (312) of the first sprocket (310). The roller (334) is disposed at both ends of the outside link (331) and the inside link (332) in a discrete space between the outside link (331) and the inside link (332), such that a place where the roller (334) is not positioned in the discrete space between the outside link (331) and the inside link (332) is still in a hollowed state. The gear tooth (311) of the first sprocket (310) may be accommodated into a place where the roller (334) is not positioned in the discrete space between the outside link (331) and the inside link (332). As a result, the chain set (330) and the first sprocket (310) may be coupled by being meshed to a lengthwise direction of the chain set (330) on the first curved part (A).
The coupling of the second sprocket (320) and the chain set (330) on the second curved part (B) may be applied by inferring from the coupling of the first sprocket (310) and the chain set (330) on the first curved part (A).
Thus, the chain set (330) may circulate in a closed loop by the plurality of rollers being sequentially accommodated into grooves of the sprockets when the first and second sprockets (310,320) are rotated.
Meantime, both ends of holding part (421) formed along a width direction of the feeding part (300) and the inside link (331) of two chain sets (330) each arranged at both ends of width direction of the feeding part (300) may be coupled to the fixing part (422) by a mold part link (424).
The mold part (400) may take a shape of a plurality of mold sets (405) being arranged along a lengthwise direction (closed circulation loop direction) of the feeding part (300). The mold set (405) may include a plurality of molds (410) arranged along the width direction of the feeding part (300), and a mold folder formed along width direction of the feeding part (300) by accommodating the plurality of molds (410).
The mold (410) may be formed at a center with a cavity (411) accommodating the molten ferrosilicon or ferro manganese supplied from the distributor (100). The cavity (411) may include a first groove (412) disposed at an inner side and a second groove (413) disposed at an outside. The mold (410) may be formed at a bottom side with a hitching stopper (414) for being coupled with a connection bar (420).
The first groove (412) may take a hemispheric shape. Depth of the first groove (412) may be deeper than the second groove (413). A cross-section of the first groove (412) is smaller than that of the second groove (413).
The second groove (413) may communicate with the first groove (412). A cross-section of the second groove (413) may take a round shape with its apex being cut in the shape of a straight line. An apex portion positioned at a widthwise direction of the feeding part (300) may be cut deeper than an apex portion positioned at a lengthwise direction of the feeding part (300) in a shape of a straight line. Furthermore, depth of the second groove (413) may be shallower than that of the first groove (412). A minimum cross-section of the second groove may be greater than a maximum cross-section of the first groove (412). A cross-section of the second groove (413) grows smaller as the depth becomes deeper. The second groove (413) may be used as an emergency groove in case the molten ferrosilicon or ferro manganese from the first groove (412) overflows. The second groove (413) is greater in cross-section than the first groove (412), such that surface tension of the molten ferrosilicon or ferro manganese grows greater. Thus, there is a need to hold back the molten ferrosilicon or ferro manganese lest the molten ferrosilicon or ferro manganese be leaked during movement.
The mold (410) may be made of stone material. The stone material may be Al₂O₃-SiC-C, SiC-C or carbon (C). Inter alia, the carbon (C) may be a graphite, an isotropic graphite, or an anisotropic graphite. The mold (410) according to an exemplary embodiment of the present disclosure is made of Al₂O₃-SiC-C, SiC-C, or carbon (C), and therefore may not melt even at a high temperature of over 3000°C. Thus, the molten ferrosilicon or ferro manganese can be easily attached or detached without being adhered.
The melting point of stone material is over 3000°C. The mold (410) according to an exemplary embodiment of the present disclosure cannot provide any influence on a surface of ferrosilicon or ferro manganese in a molten state at below the temperature of 1800°C because the melting point of stone material is over 3000°C. Thus, the molten ferrosilicon or ferro manganese cannot be adhered and can be easily attached and detached from the stone mold (410).
The coefficient of thermal expansion (meaning coefficient of linear expansion) of stone material may be more than 3.3×10^-6/°C but may be less than 6.0×10^-6/°C. Because the mold (410) according to an exemplary embodiment of the present disclosure is more than 3.3×10^-6/°C but less than 6.0×10^-6/°C in the coefficient of thermal expansion, and therefore, although the maximally expanded ferrosilicon or ferro manganese of molten state may be shrunken at a quickest possible speed the moment the maximally expanded molten ferrosilicon or ferro manganese touches by being dipped in the mold (410), the mold (410) itself is hardly changed. Thus, the molten ferrosilicon or ferro manganese can be separated by itself from a contact surface with the mold (410). As a result, the molten ferrosilicon or ferro manganese is not adhered to the mold (410) and can be easily detached from the mold (410).
Referring to FIG. 5, the mold (410) may be manufactured by a polishing (grinding) machine (2000). The polishing machine (2000) may include a polishing part (2100), a coating part (2200) and a rod (not shown). The polishing part (2100) may take a shape corresponding to that of the curvature of the first groove (412) and the second groove (413) of the stone mold (410). An outside of the polishing part (210) may take a shape corresponding to that of the curvature of the second groove (413). The outside of the polishing part (2100) may be covered by the coating part (2200). The coating part (2200) may be a diamond, whereby the stone mold (410) having a high hardness can be smoothly processed. The rod may function to transmit a power by being connected to the polishing part (2100). The polishing part (2100) rotates by receiving a rotation power generated from a power device (not shown) through the rod. Thus, a center of the stone mold (410) may be polished to form a first groove (412) and a second groove (413). Furthermore, surfaces of the first groove (412) and the second groove (413) are smoothly polished with a low roughness to allow easy discharge of the cooled ferrosilicon or ferro manganese.
A mold holder may include a holder part (421) may include a holder part (421) formed along a width direction of the feeding part (300) to accommodate a plurality of stone molds (410) by being coupled with the plurality of stone molds and a fixing part (422) formed at both ends of the holder part (421). Furthermore, the mold holder may further include a mold part link (424) connecting the fixing part (422) and the inside link (332).
The holder part (421) may be formed at an upper surface with a bar-shaped rail where the hitching stopper (414) of the mold (410) is slidingly coupled. Thus, the plurality of molds (410) may be slidingly coupled to the holder part (421), and the stone mold (410) may be fixed by allowing both ends of the connection rod (421) to be fixed by the fixing part (422) to manufacture the mold set (405). As a modification, the plurality of stone molds (410) may be integrally formed by being mutually coupled, and may be integrally coupled to the connection bar (420). In this case, a gap at a coupled part can be eliminated to reduce a leakage route of the molten ferrosilicon or ferro manganese.
The fixing part (422) disposed at both ends of the holder part (421) may be coupled to the inside link (330) of two chain sets disposed at both ends of width direction of each mold part (400). To be more specific, an outside of the fixing part (422) and an inside of the inside link (332) may be coupled by a rivet or screw joint. To be more preferable, an outside of the fixing part (422) and an inside of the inside link (332) may be coupled by interposition of mold part link (224) between the fixing part (422) and an inside of the inside link (332). The mold part links (224), each having a different thickness may be interposed in order to compensate a staircase difference because staircases of the plurality of inside links (332) are different. In this case, an outside of the fixing part (422) and an inside of the mold part link (224) may be coupled, and an outside of the mold part link (224) and an inside of the inside link (332) may be coupled by rivet or screw joint. By the abovementioned coupling, the chain set (330) and the mold part (400) are coupled, and the chain set (330) circulates in a closed loop to allow the mold part (400) to move.
Meantime, the mold set (405) may take a variety of shapes. For example, as illustrated in FIG. 6, a holder part (421) of the mold set (405) may be lengthily extended to a width direction, and an inner space may be formed by a bottom surface and a lateral surface upwardly extended from the bottom surface. The inner space of the holder part (421) may be arranged to a width direction with a plurality of stone molds (410) that is coupled with the holder part (421). Furthermore, both ends of width direction of the holder part (421) may be disposed with the fixing part (422). The fixing part (422) may be coupled to the inside link (332) of the chain set (330). Because of the differences in staircases of the plurality of inside links (332), mold part links (224) each with a different thickness may be interposed for coupling in order to compensate the differences. By the abovementioned coupling, the chain set (330) and the mold part (400) are coupled, and the chain set (330) circulates in a closed loop to allow the mold part (400) to move.
A total of two cooling devices (600) are disposed, each at an upper side and a bottom side of the feeding part (300). To be more specific, one cooling device is disposed at an upper side of an upper feeding route moving from the first curved part (A) to the second curved part (B), and the other is disposed at a bottom side of a bottom feeding route moving from the second curved part (B) to the first curved part (A).
The cooling device (600) functions to cool the mold part (400), formed in a water mist type, and amount of water may be adequately selected according to amount of the supplied molten ferrosilicon or ferro manganese.
The cooling device (600) may cool the mold part (400) in such a manner that water is injected in a mist type to allow water to contact a surface of the mold part (400), where the water is evaporated to cool the mold part (400). In a case where the molten ferrosilicon or ferro manganese contacts the mold part (400) while evaporation is not fully realized, there may be generated a dangerous situation due to instant evaporation. The drying device (700), which is disposed to prevent the dangerous situation, may be disposed at a distal end of the bottom cooling device to finally cool the mold part (400).
The drying device (700) may be comprised of a blower, and may function to reduce the temperature of the mold part (400) and to remove the moisture on the surface of the mold part by way of air cooling method.
Now, an operation of casting apparatus (1000) according to an exemplary embodiment of the present disclosure will be described.
Referring to FIG. 1, the mold set (405) of the mold part (400) may sequentially receive the molten ferrosilicon or ferro manganese from the distributor (100). Thereafter, first and second strokes (310,320) are counterclockwise rotated to allow the chain set (330) of the feeding part (300) to circulate in a closed loop to a clockwise direction.
The mold set (405) may be transferred from the distributor (100) to the first curved part (A). In this transferring process, the molten ferrosilicon or ferro manganese may be condensed to form ferrosilicon or ferro manganese pieces. Then, the molten ferrosilicon or ferro manganese is cooled by the upper cooling device (600).
The neighboring mold set (405) may be distanced on the first curved part (A) by the curvature of the first stroke (310). That is, the mold part (400) is opened or split up. In the modification (not shown), the neighboring mold sets (405) may be distanced even during the normal times. In this case, a distance between the mold sets (405) may be lengthened.
The mold set (405) may be finally erected at the first curved part (A).The ferrosilicon or ferro manganese pieces may be discharged in this process.
The mold part (400), after the ferrosilicon or ferro manganese pieces are discharged, may be fed from the first curved part (A) to the second curved part (B), and additionally cooled at the feeding route by the bottom cooling device (600). Thereafter, the mold part (400) may be finally cooled and dried by the drying device (700).
Successively, the mold part (400) may circulate in a close loop to the distributor (100) by passing by the second curved part (B), and receive the molten ferrosilicon or ferro manganese again.
The above configuration has an advantageous effect of casting ferrosilicon or ferro manganese continuously. Furthermore, there is another advantageous effect of easily discharging the cooled and condensed ferrosilicon or ferro manganese. Furthermore, there is no gap due to structural configuration among the feeding part (300), the mold part (400) and the mold set (405), and neighboring mold set (405) can interrupt the leakage route of the molten ferrosilicon or ferro manganese because widening is generated at the first curved part (A) where the cooled molten ferrosilicon or ferro manganese is discharged.
Although the abovementioned embodiments according to the present disclosure have been described in detail with reference to the above specific examples, the embodiments are, however, intended to be illustrative only, and thereby do not limit the scope of protection of the present disclosure. Thereby, it should be appreciated by the skilled in the art that changes, modifications and amendments to the above examples may be made without deviating from the scope of protection of the disclosure.

Claims

A mold centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.
The mold of claim 1, wherein the cavity is made with a stone material, and includes a first groove, and a second groove connected to the first groove and extended from the first groove to an outside, wherein depth of the first groove is deeper than that of the second groove.
The mold of claim 2, wherein the first groove takes a hemispherical shape, a cross-section of the second groove takes a round shape with an apex portion being cut in a straight line, and the size of the second groove grows smaller as depth grows deeper, and a minimum cross-section of the second groove is greater than a maximum cross-section of the first groove.
The mold of claim 1, wherein the stone material is Al₂O₃-siC-C, SiC-C or carbon (C).
The mold of claim 1, wherein a melting point of the stone material is greater than 3000°C.
The mold of claim 1, wherein coefficient of thermal expansion of stone material is more than 3.3×10^-6/°C but less than 6.0×10^-6/°C.
A mold set, the mold set comprising:
a molder holder; and
a plurality of molds arranged by being coupled to the mold holder, wherein the mold may be centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.
A casting apparatus, the casting apparatus comprising:
a distributor distributing a molten ferrosilicon or ferro manganese;

a mold part including a plurality of mold sets receiving the distribution of the molten ferrosilicon or ferro manganese from the distributor; and

a feeding part feeding the mold part by passing from a first curved part and to a second curved part in a closed-circulative loop, wherein

the molten ferrosilicon or ferro manganese cooled by the mold part is discharged from the first curved part, and wherein

a mold set comprises:
a molder holder; and
a plurality of molds arranged by being coupled to the mold holder, wherein the mold is centrally formed with a cavity to be inputted with molten ferrosilicon or ferro-maganese and made with a stone material.
The casting apparatus of claim 8, wherein the feeding part includes:
a first sprocket;

a second sprocket; and

a chain set circulating in a closed-circulative loop by forming a first curved part by being coupled with the first sprocket, and forming a second curved part by being coupled with the second sprocket.
A casting apparatus of claim 8, wherein a neighboring mold set is distanced from the first curved part.