KR102250794B1 - Vertical separation type hydraulic tilt casting device and tilt casting method - Google Patents

Abstract

The present invention relates to an upper and lower type hydraulic tilt casting apparatus and a tilt casting method using the same, and more particularly, to a mold separated into an upper mold and a lower mold by forming a pressurizing portion and pressing the pressurizing portion with a hydraulic device to shrink the molten metal. It relates to a vertical separation type hydraulic tilt casting device and a tilt casting method capable of manufacturing a casting product with a small quality deviation without the need for compensation.
According to an embodiment of the present invention, when the upper and lower molds are combined, a predetermined cavity is formed therein, but a pressing portion is formed at one side of the cavity, and between the pressing portion and the cavity, the pressing portion and the cross-sectional area of the cavity are A neck having a small cross-sectional area is formed; An injection cup is coupled to one surface of the lower mold on the side of the pressing portion; After injecting the molten metal into the injection cup, the mold assembly in which the upper mold, the lower mold and the injection cup are combined is tilted to inject the molten metal inside the injection cup into the cavity; A tilting device for inclining the tilting casting mold at a predetermined speed to inject molten metal into the cavity; And a pressurizing device for pressing the pressurizing portion; The pressurizing device includes: a pressurizing unit cover formed to receive an outer circumferential surface of the pressurizing portion of the tilting casting mold, fixed to the tilting casting mold to form a predetermined sealed space including the pressurizing portion; And a piston that is accommodated inside the pressurization part cover and pressurizes the pressurization part in a closed space formed by fixing the pressurization part cover to the tilting casting mold; The tilting device is driven to inject the molten metal into the cavity, and then the injection cup is removed, and the pressurization part cover is fixed to the tilting casting mold to accommodate the pressurization part, and then the pressurization part is controlled to pressurize the pressurization part with a piston. And a hydraulic device for applying pressure to the piston. It provides a vertical separation type hydraulic tilt casting apparatus, characterized in that the pressure applied to the molten metal is greater than the pressure applied to the molten metal by the pressurizing part cover than the pressure applied to the die for hard casting.

Description

Vertical separation type hydraulic tilt casting device and tilt casting method}

The present invention relates to an upper and lower type hydraulic tilt casting apparatus and a tilt casting method using the same, and more particularly, to a mold separated into an upper mold and a lower mold by forming a pressurizing portion and pressing the pressurizing portion with a hydraulic device to shrink the molten metal. It relates to a vertical separation type hydraulic tilt casting device and a tilt casting method capable of manufacturing a casting product with a small quality deviation without the need for compensation.

The hard casting method, which is a kind of casting method using a permanent (semi-permanent) mold, has been applied in various industrial fields.

In a low-pressure casting method such as hard copper casting, a mold design that reflects the shrinkage compensation is required in consideration of the shrinkage phenomenon in the phase change process of the metal from the liquid phase to the solid phase when the molten metal is cooled.

In Korean Utility Model Publication No. 20-2011-0001719, "As a ladle that removes oxides generated on the surface of the molten material, each bar fixedly installed at both ends of the ladle on the side of the molten material injection port provided in the mold frame. ) Support rings; Bars supported by each of the two sides of each bar support ring; A plurality of oxide attachment plate support rings each fitted thereto; And it is fixedly installed at the lower end of the plurality of oxide attachment plate support rings, and the ladle is cast A ladle for a gravity casting machine, characterized in that it includes an oxide attachment plate for attaching an oxide generated on the surface of the molten material when the molten material flows toward the molten material injection port by being inclined for the process is disclosed.

The conventional tilt casting method as described above increases the complexity of mold design, has a large defect rate and quality deviation during repeated production, and has a high dependence on work skill, making it almost impossible to automate the process.

In addition, during the operation of the tilting device (the process of injecting the molten material in the ladle by tilting the mold), it is necessary to further inject the insufficient amount of molten metal by hand. There are a lot of these necessary parts.

The problem to be solved by the present invention is to solve the problems of the conventional tilt casting method as described above, by including a pressurizing device that presses the pressurizing part after the tilting process, so that there is no need for compensation in the cavity and the process can be automated. It is to provide an apparatus and a method for casting a hard cast, and a mold for casting a hard cast used therefor.

In order to solve the problem of the conventional tilt casting method, the present invention is in a mold for tilt casting including an upper mold and a lower mold, when the upper mold and the lower mold are combined, a predetermined cavity is formed inside, but one side of the cavity is pressed. A hot spring is formed; An injection cup is coupled to one surface of the lower mold on the side of the pressing portion; After injecting the molten metal into the injection cup, the mold assembly in which the upper mold, the lower mold and the injection cup are combined is tilted to inject the molten metal inside the injection cup into the cavity.

In addition, the hard casting mold as described above; A tilting device for inclining the tilting casting mold at a predetermined speed to inject molten metal into the cavity; And a pressurizing device for pressing the pressurizing portion; The pressurizing device includes: a pressurizing portion cover formed to receive an outer circumferential surface of the pressurizing portion of the tilting casting mold, and being fixed to the tilting casting mold to form a predetermined sealed space including the pressurizing portion; A piston that is accommodated inside the pressurizing unit cover, and pressurizing the pressurizing unit in a closed space formed by fixing the pressurizing unit cover to a mold for tilting casting; It provides a tilting casting apparatus for driving the tilting device to inject the molten metal into the cavity, removing the injection cup, fixing the pressing metal cover to the tilt casting mold to accommodate the pressing metal, and then pressing the pressing metal with a piston. ,

Further, the pressurizing device further includes a hydraulic device for applying pressure to the pressurizing portion cover and the piston; It may be configured such that the pressure applied to the molten metal by the piston is greater than the pressure applied to the metal casting mold by the pressure metal part cover.

In addition, the hydraulic device may be connected to the pressurizing unit cover and the piston by a single hydraulic circuit, and the pressurizing unit cover may be configured to have a larger area of a cross section perpendicular to the pressing direction than the piston.

In addition, the pressurizing device may be provided with an electromagnet on one side of the pressurizing unit cover, and may be configured to closely contact the pressurizing unit cover and the tilting casting mold during a pressing process of the pressurizing unit by a piston.

In addition, the pressurizing device may be configured to be provided with a fastening part corresponding to each other to the pressurizing unit cover and the tilting casting mold, and fixedly coupling the pressurizing unit cover and the tilting casting mold in the pressing process of the pressurizing unit by a piston. .

, (4) 압탕부커버 내부 깊이

, (5) 압탕부 깊이

일 때,

조건에서 캐비티의 가압이 시작되도록 구성될 수 있다.In addition, the pressurizing device includes (1) a cross-sectional area of the piston A, (2) an inner cross-sectional area of the pressurizing portion B, and (3) the depth at which the piston is inserted into the pressurizing portion.

, (4) Inner depth of the pressurization part cover

, (5) depth of the pressurization part

when,

It can be configured to start pressing of the cavity under conditions.

In addition, in the tilt casting method, using the tilt casting apparatus as described above, the injection cup coupling step of fixing the injection cup to the tilt casting mold; A first molten metal injection step of injecting molten metal into the injection cup after the injection cup combining step; After the first molten metal injection step, a second molten metal injection step in which the molten metal inside the injection cup is injected into the cavity by gravity by tilting the hard copper casting mold; After the second molten metal injection step, an injection cup separating step of separating the injection cup from the mold for hard copper casting; After the step of separating the injection cup, a pressurization preparation step of intimately contacting the pressurization part cover with a die for tilt casting to accommodate the pressurization part; After the pressurization preparation step, a pressurization step of pushing the piston to pressurize the molten metal in the pressurization unit; During the pressing step, a cooling step of cooling the molten metal; After the pressing step and the cooling step, a pressure release step of separating the pressurizing device from the hard casting mold; After the pressure releasing step, comprising a cast product separating step of separating the cast product from the mold for hard casting by separating the upper mold and the lower mold; Provides a hard casting method.

According to an embodiment of the present invention, the pressing process can be performed immediately after the tilting process by forming a pressing portion in the mold.

In addition, by pressing the pressurizing unit using a hydraulic device, it is possible to prevent the molten metal from leaking out of the pressurizing unit and the mold.

In addition, since a separate compensation is not required for the mold, the complexity of mold design can be reduced.

In addition, it is possible to reduce the quality deviation of the cast product cast through the light copper casting.

In addition, it is possible to automate the casting process due to the low dependence on the skill level of the operation.

And, by shortening the cooling time of the molten metal, it is possible to increase the production amount per hour of the cast product.

1 is a cross-sectional view of a die for hard casting according to an embodiment of the present invention.
2 is a cross-sectional view of a state in which a molten metal is injected into a cavity by tilting a die for tilt casting according to an embodiment of the present invention.
3 is a cross-sectional view of a state in which an injection cup is removed from a die for casting a tilted copper according to an embodiment of the present invention.
4 is a cross-sectional view of a state in which a pressing device is in close contact with a die for tilt casting according to an embodiment of the present invention.
5 is a cross-sectional view of a state in which a pressing device presses a molten metal in a tilt casting apparatus according to an embodiment of the present invention.
6 is a schematic diagram showing a hydraulic circuit of a hydraulic device according to an embodiment of the present invention.
7 is a view showing the dimensions of a specific part of a tilt casting apparatus according to an embodiment of the present invention.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. However, this is not intended to limit the techniques described in this document to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of this document. . In connection with the description of the drawings, similar reference numerals may be used for similar elements.

In this document, expressions such as "have," "may have," "include," or "may contain" are the presence of corresponding features (eg, elements such as numbers, functions, actions, or parts). And does not exclude the presence of additional features.

In this document, expressions such as "A or B," "at least one of A or/and B," or "one or more of A or/and B" may include all possible combinations of the items listed together. . For example, "A or B," "at least one of A and B," or "at least one of A or B" includes (1) at least one A, (2) at least one B, Or (3) it may refer to all cases including both at least one A and at least one B.

Expressions such as "first," "second," "first," or "second," used in this document can modify various elements regardless of their order and/or importance, and It is used to distinguish it from other components and does not limit the components. For example, a first user device and a second user device may represent different user devices regardless of order or importance. For example, without departing from the scope of the rights described in this document, a first component may be referred to as a second component, and similarly, a second component may be renamed to a first component.

Some component (eg, the first component) is “(functionally or communicatively) coupled with/to” to another component (eg, the second component) or “connected” When referred to as "connected to", it should be understood that the certain component may be directly connected to the other component or may be connected through another component (eg, a third component). On the other hand, when a component (eg, a first component) is referred to as being “directly connected” or “directly connected” to another component (eg, a second component), the component and the It may be understood that no other component (eg, a third component) exists between the different components.

The expression "configured to" as used in this document is, for example, "suitable for," "having the capacity to" depending on the situation. ," "designed to," "adapted to," "made to," or "capable of." The term "configured to (or set)" may not necessarily mean only "specifically designed to" in hardware. Instead, in some situations, the expression "a device configured to" may mean that the device "can" along with other devices or parts. For example, the phrase “a processor configured (or configured) to perform A, B, and C” means a dedicated processor (eg, an embedded processor) for performing the operation, or by executing one or more software programs stored in a memory device. , May mean a generic-purpose processor (eg, a CPU or an application processor) capable of performing corresponding operations.

Terms used in this document are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the technical field described in this document. Among terms used in this document, terms defined in a general dictionary may be interpreted as having the same or similar meanings as those in the context of the related technology, and unless explicitly defined in this document, they have ideal or excessively formal meanings. Is not interpreted as. In some cases, even terms defined in this document cannot be interpreted to exclude embodiments of this document.

Various modifications can be made by those of ordinary skill in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims of the present invention, and these modifications are the technical spirit of the present invention. It should not be understood individually from the perspective.

According to an embodiment of the present invention, in a mold for tilt casting including an upper mold and a lower mold, when the upper and lower molds are combined, a predetermined cavity is formed therein, and a pressing portion is formed on one side of the cavity; An injection cup is coupled to one surface of the lower mold on the side of the pressing portion; After the molten metal is injected into the injection cup, a mold assembly in which the upper mold, the lower mold and the injection cup are combined is tilted to inject the molten metal inside the injection cup into the cavity.

The pressurization unit includes a flow path (injection) through which the molten metal is injected into the cavity, and the molten metal flows into the cavity through the pressurization unit, and may be configured to accommodate a piston of a pressurizing device to be described later. One or more pressurization units may be provided, and a number of pressurization devices corresponding to the number of pressurization units may be required.

A neck is formed between the pressurization unit and the cavity, and may be configured to remove the molten metal located in the pressurization unit from the cast after solidification of the molten metal.

A predetermined cooling water flow path may be formed in the inside of the die for hard copper casting, and may be configured to cool the molten metal after injection of the molten metal is completed. In this case, it is preferable that a cooling water flow path is not provided in the vicinity of the pressing portion, or a cooling water flow path is provided so that the flow rate of the cooling water in the vicinity of the pressing portion is smaller than that of the cavity. Through this configuration, the cavity is preferentially cooled, and then the pressurized portion is cooled, thereby reducing variations in the quality of the cast product.

It is preferable that the inner volume of the infusion cup is configured to be larger than the cavity volume (volume of acceptable fluid). By configuring the infusion cup volume to be "injection cup volume <cavity volume + pressurization part volume", additional injection of molten metal in the tilting process can be omitted. In view of the shrinkage of the molten metal, it is preferable that the volume of the pressurization portion is configured to be within a range of 10% to 20% of the cavity volume. If the volume of the pressurization unit is insufficient, the molten metal is contracted to the bottom of the neck due to the contraction, which may lead to defects in the casting. If the pressurization unit has an excessive volume, the operation of the pressurization device to be described later will not be performed normally. The amount of molten metal to be injected may be excessive, resulting in waste of cost (raw materials).

In addition, the hard casting mold as described above; A tilting device for inclining the tilting casting mold at a predetermined speed to inject molten metal into the cavity; And a pressurizing device for pressing the pressurizing portion; The pressurizing device includes: a pressurizing portion cover formed to receive an outer circumferential surface of the pressurizing portion of the tilting casting mold, and being fixed to the tilting casting mold to form a predetermined sealed space including the pressurizing portion; A piston that is accommodated inside the pressurizing unit cover, and pressurizing the pressurizing unit in a closed space formed by fixing the pressurizing unit cover to a mold for tilting casting; Provides a tilting casting apparatus for driving the tilting device to inject the molten metal into the cavity, removing the injection cup, fixing the pressurizing part cover to the tilting casting mold to accommodate the pressurizing part, and then pressing the pressurizing part with a piston. ,

In the above base, the pressurization part cover is "formed to accommodate the outer circumferential surface of the pressurization part of the mold for hard casting", the constitution that the pressurization part completely covers the pressurization part so that the molten metal in the cavity below the pressurization part does not leak to the outside of the pressurization device or the mold during the pressurization process. Can mean

Since the tilting device is a structure that can be easily configured by a person skilled in the art by referring to the conventional tilting device and the specification of the present invention, description of the speed at which the mold is tilted will be omitted.

The closed space refers to a configuration in which the molten metal does not leak to the outside of the pressurizing device or the mold, and does not mean the sealing of particles smaller than the particles of the molten metal such as air or other gas.

When the pressurizing portion is pressurized by the piston as described above, some of the molten metal in the pressurizing portion is discharged to the outside of the pressurizing portion (outside the mold), and the discharged molten metal is trapped inside the pressurizing portion cover. If pressurization is continued through the piston in this state (when the piston is inserted deeper), the molten metal below the pressurization part cover receives an external force equal to the force received by the piston and receives a compressive force, and accordingly, a cast product having the same shape as the cavity. Can be obtained. Through this process, it is possible to mass-produce cast products with remarkably low quality deviations without considering compensation due to shrinkage.

When pressurizing using a piston, gas components such as air may be included in the pressurizing unit cover if the inside and outside of the pressurizing unit cover are completely sealed (when the flow of gas is blocked), but since the molten metal was injected into the cavity through the tilt casting method, air, etc. All gas components are located on the upper part of the pressurized metal, and gas is not mixed into the molten metal. In addition, when pressurized, the gas is also compressed under pressure, and the influence of the gas can be neglected because the piston uniformly compresses the inside of the pressurized part below the pressurized part cover. However, if precision processing is required, a vacuum forming means may be further provided in the pressurizing device in order to reduce the influence of the gas. The pressurization unit cover is closely attached to the mold to block the inside and outside of the pressurization unit cover with air, and then the air inside the pressurization unit cover is removed, so that the inside of the pressurization unit cover is filled with the molten metal during the pressurization process.

Further, the pressurizing device further includes a hydraulic device for applying pressure to the pressurizing portion cover and the piston; It may be configured such that the pressure applied to the molten metal by the piston is greater than the pressure applied to the metal casting mold by the pressure metal part cover.

The pressurizing device may be provided with an actuator that closely contacts the pressurizing part cover and the tilting casting mold. As shown in Figs. 3 and 4, the actuator is operated so that the pressurizing part cover and the die for hard casting can be brought into close contact with each other. After being in close contact, the hydraulic device is operated to push the pressurizing unit cover and the piston, thereby improving the sealing force between the pressurizing unit cover and the tilting casting mold, and simultaneously pressurizing the pressurizing unit with the piston.

If the sealing between the pressurization unit cover and the hard copper casting mold is not intact, the molten metal may leak out of the pressurization unit cover by the pressure of the molten metal in the pressurization unit caused by the piston. It can occur when the force (pressure) between the quiet mold is less than the force (pressure) between the piston and the melt. In order to prevent such a phenomenon, it is preferable to control the pressure of the pressurizing part cover and the pressure of the piston as described above.

In addition, the hydraulic device may be connected to the pressurizing unit cover and the piston by a single hydraulic circuit, and the pressurizing unit cover may be configured to have a larger area of a cross section perpendicular to the pressing direction than the piston.

It is also possible to have a hydraulic device to pressurize the pressurizing part cover and a hydraulic device to pressurize the piston to control each of them, but in this case, the structure of the device becomes complicated and the complexity of the control increases, resulting in malfunction and failure. The likelihood of this can also increase. Therefore, the pressure control configuration of the pressurization part cover and the piston through a single hydraulic circuit as described above is preferable.

On the other hand, while the piston pressurizes the molten metal, the clamping force between the upper and lower molds can act as an important element of the design of the casting process. If the mold clamping force between the upper and lower molds does not increase in proportion to the increase of the pressing force by the piston, defects in the cast product may occur due to separation of the upper and lower molds.

Therefore, in order to solve the mold clamping force problem as described above, the hydraulic circuit of the hydraulic device can be connected to the upper and lower molds. As shown in Fig. 6, it may be configured to apply the largest force to the upper and lower molds in a single hydraulic circuit, and then to apply differently the magnitude of the force in the order of the pressurization part cover and the piston. This pressure differential can be caused by Pascal's Principle. P1, P2, P3, and P4 shown in FIG. 6 may mean a pipe cross-sectional area of a hydraulic circuit. When pressure is applied at the hydraulic input terminal P1, hydraulic pressure is output from P2, P3, and P4, and the magnitude of the hydraulic force is proportional to P2, P3, and P4 (area) (F=PA, F: force, P: pressure, A: Cross-sectional area) It is applied to the pressurizing part cover, piston and mold.

The force applied to the mold (upper mold and lower mold) may be configured to apply pressure to the other (unfixed upper mold or lower mold) through a hydraulic device with either the upper mold or the lower mold as a fixed end.

In addition, the pressurizing device may be provided with an electromagnet on one side of the pressurizing unit cover, and may be configured to closely contact the pressurizing unit cover and the tilting casting mold during a pressing process of the pressurizing unit by a piston.

In the above configuration, the alloy composition ratio of the die for hard casting may be adjusted (may be configured so that only the contact portion with the pressing portion cover has magnetic properties) so as to react with the magnetic material. It is also possible to support the attachment of the pressurization part cover and the hard copper casting mold through an electromagnet, or if the strength of the electromagnet is strong, the pressurization part cover and the hard copper casting mold may be sealed with an electromagnet.

It has the effect of automating the process and shortening the production time as it is easy to detach and detach between the mold for hard casting such as a hydraulic device or an electromagnet, and the pressurizing part cover. In the above configuration, it may be a giant technology (as opposed to an appropriate technology). Equipment construction costs can be greatly increased due to the provision of hydraulic devices, and thus, in places where the number of castings is not large (R&D team, etc.), the equipment construction can be economically burdened. Accordingly, there is a need for a configuration capable of forming a seal between the pressurizing part cover and the tilting casting mold without having the hydraulic device as described above.

The pressurizing device may be configured such that fastening portions corresponding to each other are provided to the pressurizing unit cover and the tilting casting mold, and fixing the pressurizing unit cover and the tilting casting mold in a process of pressing the pressurizing unit by a piston.

In consideration of the pressure received by the molten metal, the number and position of the fastening parts can be adjusted. The fastening portion may include a mechanical element that fixes two or more members, such as a bolt-nut, a hook, and a fitting shape, and this is a range that a person skilled in the art can easily implement with reference to the description of the present invention, so detailed description Is omitted.

Through the above configuration, it takes more time than the time required for the sealing process between the pressurization part cover and the hard casting mold using a hydraulic device, etc., but it is possible to construct a device with low complexity of the device and low equipment cost. I can. A configuration including a combination of a fastening part, a hydraulic device, and an electromagnet is also possible.

, (4) 압탕부커버 내부 깊이

, (5) 압탕부 깊이

일 때,

조건에서 캐비티의 가압이 시작되도록 구성될 수 있다.In addition, the pressurizing device includes (1) a cross-sectional area of the piston A, (2) an inner cross-sectional area of the pressurizing portion B, and (3) the depth at which the piston is inserted into the pressurizing portion.

, (4) Inner depth of the pressurization part cover

, (5) depth of the pressurization part

when,

It can be configured to start pressing of the cavity under conditions.

In the configuration of the pressurizing device as shown in FIG. 7, the volume of the pressurizing part cover excluding the volume of the piston is

로 나타낼 수 있다. (A : 피스톤 단면적, B : 압탕부커버 내부 단면적, L1 : 피스톤이 압탕부 내로 진입한 깊이, L2 : 압탕부커버 내부 깊이, L3 : 압탕부 깊이)

It can be expressed as (A: cross-sectional area of the piston, B: the inner cross-sectional area of the pressurization part cover, L1: the depth at which the piston enters the pressurization part, L2: the inner depth of the pressurization part cover, L3: the pressurization part depth)

이므로, 피스톤에 의한 캐비티 내 용탕의 가압이 시작되려면

를 만족해야 한다.On the other hand, the volume of the molten metal pushed out by the piston entering the pressurization part is

Therefore, in order to start pressurization of the molten metal in the cavity by the piston

Should be satisfied.

일 수 있다. 식을 정리하면,In this case, if the depth of the pressurization unit is too deep, the amount of molten metal injected into the pressurization unit increases and loss may occur. If the depth of the pressurization unit is excessively shallow, contact between the piston and the neck occurs and compression is difficult. It may not happen. Therefore, the optimal condition is

Can be In summary,

가 성립한다.

Is established.

In addition, in the tilt casting method, using the tilt casting apparatus as described above, the injection cup coupling step of fixing the injection cup to the tilt casting mold; A first molten metal injection step of injecting molten metal into the injection cup after the injection cup combining step; After the first molten metal injection step, a second molten metal injection step in which the molten metal inside the injection cup is injected into the cavity by gravity by tilting the hard copper casting mold; After the second molten metal injection step, an injection cup separating step of separating the injection cup from the mold for hard copper casting; After the step of separating the injection cup, a pressurization preparation step of intimately contacting the pressurization part cover with a die for tilt casting to accommodate the pressurization part; After the pressurization preparation step, a pressurization step of pushing the piston to pressurize the molten metal in the pressurization unit; During the pressing step, a cooling step of cooling the molten metal; After the pressing step and the cooling step, a pressure release step of separating the pressurizing device from the hard casting mold; After the pressure releasing step, comprising a cast product separating step of separating the cast product from the mold for hard casting by separating the upper mold and the lower mold; Provides a hard casting method.

According to the above-described tilt casting method, it is possible to shorten the cooling rate by additionally forming a cooling water passage compared to the conventional tilt casting. In the conventional hard casting, there was a limit to the cooling speed because compensation by shrinkage had to be considered, the complexity of the mold design was high, and the quality deviation of the cast product was high when the cast product was produced several times, but the above-described problem in the pressurized tilt casting method as described above. Can be resolved.

11: upper type 12: lower type
100: cavity 101: pressurized portion
102: neck 13: injection cup
21: presser cover 22: piston
23: hydraulic system M: molten metal

Claims (5)

When the upper mold and the lower mold are combined, a mold for light casting is formed in which a predetermined cavity is formed therein;
The Kyungdong casting mold is:
A pressing portion formed on one side of the cavity;
A neck formed between the pressing portion and the cavity and having a cross-sectional area smaller than that of the pressing portion and the cavity;
An injection cup coupled to one surface of the lower mold on the side of the pressing portion; And
Including; a cooling water flow path provided to cool the molten metal after the injection of the molten metal is completed,
After injecting the molten metal into the injection cup, it is configured to inject the molten metal from the inside of the injection cup into the cavity by tilting the upper mold, the lower mold, and the tilting mold combined with the injection cup,
A tilting device for inclining the tilting casting mold at a predetermined speed to inject molten metal into the cavity;
And a pressurizing device for pressing the pressurizing portion;
The pressurizing device is:
A pressing portion cover formed to receive an outer circumferential surface of the pressing portion of the tilting casting mold, and being fixed to the tilting casting mold to form a predetermined sealed space including the pressing portion;
And a piston that is accommodated inside the pressurization part cover and pressurizes the pressurization part in a closed space formed by fixing the pressurization part cover to the tilting casting mold;
The tilting device is driven to inject the molten metal into the cavity, and then the injection cup is removed, and the pressurizing part cover is fixed to the tilting casting mold to accommodate the pressurizing part, and then controlled to press the pressurizing part with a piston,
Further comprising a hydraulic device for applying pressure to the pressurizing unit cover, the piston, the upper and lower molds through a single hydraulic circuit;
The hydraulic device is:
① so that the pressure applied by the pressurized metal part cover to the die for hard copper casting is greater than the pressure applied by the piston to the molten metal, and
② Upper and lower type separating hydraulic tilt casting equipment that is controlled so that the pressure applied to the upper and lower molds is greater than the pressure applied to the pressurizing part cover. The method of claim 1,
The hydraulic device,
Vertical separation type hydraulic tilt casting device, characterized in that the pressurizing part cover has a larger area of a cross section perpendicular to the pressing direction than the piston The method of claim 1,
The pressing device,
An electromagnet is provided on one side of the pressurizing unit cover, and the pressurizing unit cover and the tilting casting mold are in close contact with each other during the pressing of the pressurizing unit by a piston. The method of claim 1,
The pressing device,
The upper and lower type separate hydraulic tilt casting apparatus is provided with a fastening part corresponding to each other in the pressurizing part cover and the tilting casting mold, and fixing the pressurizing part cover and the tilting casting mold in the process of pressing the pressurizing part by a piston In the Kyungdong casting method,
Using the vertical separation type hydraulic tilt casting device of any one of claims 1 to 4,
Infusion cup coupling step of fixing the injection cup to the mold for hard casting;
A first molten metal injection step of injecting molten metal into the injection cup after the injection cup combining step;
After the first molten metal injection step, a second molten metal injection step in which the molten metal inside the injection cup is injected into the cavity by gravity by tilting the hard copper casting mold;
After the second molten metal injection step, an injection cup separating step of separating the injection cup from the mold for hard copper casting;
After the step of separating the injection cup, a pressurization preparation step of intimately contacting the pressurization part cover with a mold for tilting casting to accommodate the pressurization part;
After the pressurization preparation step, a pressurization step of pushing the piston to pressurize the molten metal in the pressurization unit;
During the pressing step, a cooling step of cooling the molten metal;
After the pressing step and the cooling step, a pressure release step of separating the pressurizing device from the die for hard casting;
After the pressure releasing step, a cast product separation step of separating the upper and lower molds and separating the cast product from the die for light copper casting;
And removing the solidified portion of the molten metal located in the pressing portion from the cast product; Kyungdong casting method

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