KR101963857B1 - Apparatus for manufacturing core using resin coated sand and method - Google Patents

Abstract

The apparatus includes a mold 10 in which a mold chamber 5 as an internal space for receiving and receiving resin-coated sand is formed, a mold 10 (Not shown) for supplying resin-coated sand through one side of the mold 10, an air supply unit 40 for supplying air to the mold 10, and an air supply unit 40 for varying the temperature An air temperature regulating unit 30 and a mold temperature regulating unit 50 disposed on the mold 10 to surround the mold chamber 5 disposed in the mold 10, A hot air flow conduit 60 connecting the mold chamber 5 and an air vent conduit 70 passing through the mold 10 and connecting the mold chamber 5 to the outside, Coated sand from the core feeder (20) to the mold chamber Step of supplying (5); Blowing hot air into the mold chamber (5) through the air supply (40) and the hot air flow duct (60); And discharging the hot air circulated between the resin-coated sand loaded in the mold chamber (5) through the air vent duct (70) formed to communicate with the mold chamber (5) from the outside.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for manufacturing a core using resin-coated sand (RCS)

The present invention relates to a technique for manufacturing a hollow core, and relates to a hollow core manufacturing technique for directly heating a resin-coated sand material loaded in a mold using hot air.

The core is a model for making the internal shape of a casting product, and uses a refractory inorganic material including sand or metal.

When making castings from metal with a complicated shape and a high temperature of molten metal, it is mainly made of sand and ceramics, and RCS (resin coated sand) is used in the above manufacturing process.

In the case of existing core manufacturing process, RCS is injected into the mold after the mold temperature is raised, and then sintered for a certain period of time. In order to raise the temperature of the mold, heating of the mold using gas or electric resistance coil Insert the same heating element to raise the mold temperature.

On the other hand, in the case of the conventional method for producing a sintered body, there is a disadvantage in that the sintering condition can not be obtained when the shape of the core is complicated or the thickness deviation is large. Even if the sintering time is too long, the possibility of shape collapse and occurrence of inclusion defects is increased due to decrease in core strength. In addition, when the sintering time is short, there is a problem that bubble defects due to the generation of a large amount of gas at the time of casting production due to the generation of minute fine particles and work environment are hindered.

There is a problem in that it is impossible to set an optimal sintering process for the thin part and the thick part in the case of the conventional method for manufacturing the sintered body.

The general manufacturing process of existing Austempered Iron is as follows: at the austenite temperature region having a temperature range of 750 to 950 ° C in the case of gray cast iron and spheroidal graphite cast iron through a mold, And the tissue is controlled through the process of putting the product into the constant temperature maintaining bath of the area. That is, there is a problem that the main product of the Austempered Ductile Iron (ADI) and the Austempered Gray Iron (AGI) of the existing process must be subjected to an Ostermal Furring process, which is a separate heat treatment process.

As a conventional literature suggesting a method for manufacturing a cast iron core, Korean Patent No. 10-1102874, No. 10-0247891, and Japanese Patent Laid-Open No. 1997-029387 can be referred to. The above documents disclose a technique of forming a hollow core by controlling temperature and heat applied to a mold.

(Patent Document 1) KR10-1102874 B

(Patent Document 2) KR10-0247891 B

(Patent Document 3) JP1997-029387 A

In order to solve the above-mentioned conventional problems, the present invention adopts a process of heating a mold using a gas or heating a mold to raise the mold temperature in the case of a core manufacturing process, It is difficult to determine a proper sintering condition when the thickness of the mold is large or complex. In this case, the temperature of the mold is not directly raised, but the temperature of the sand is increased by using hot air directly It is an object to provide a manufacturing technique.

According to one aspect of the present invention, there is provided an apparatus for manufacturing a core using resin-coated sand (RCS), comprising: a mold (10) for forming a mold chamber (5) as an internal space for receiving and receiving resin-coated sand; A core supply unit 20 for supplying resin-coated sand into the mold chamber 5 through one side of the mold 10; An air supply unit 40 for supplying air to the mold chamber 5 of the mold 10; An air temperature control unit 30 for enabling temperature variation with respect to air supplied from the air supply unit 40; A mold temperature control unit 50 disposed on the mold 10 in a form surrounding the mold chamber 5 disposed in the mold 10; A flow conduit 60 formed in the mold 10 to connect the mold chamber 5 and the outside of the mold 10; And an air vent pipe 70 passing through the mold 10 and connecting the mold chamber 5 to the outside and using the hot air through the air supply unit 40 and the air temperature control unit 30. [ Thereby increasing the temperature of the resin-coated sand loaded in the mold chamber 5, thereby forming the core through the sintering process.

The central supply unit 20 includes an RCS supply hopper 21 and a metering hopper 23 detachably connected to the lower end of the RCS supply hopper 21, The resin-coated sand injected onto the mold chamber 23 is supplied into the mold chamber 5 through the air blowing device 25 disposed at the upper portion of the metering hopper 23.

According to another aspect of the present invention, there is provided a method of using a resin-coated sand (RCS) -based resin manufacturing apparatus, the apparatus comprising a mold chamber (5) An air supply unit 40 for supplying air to the mold 10 and an air supply unit 40 for supplying resin-coated sand through one side of the mold 10, An air temperature regulating part 30 for allowing temperature change with respect to air to be supplied to the mold 10, and a mold temperature regulating part (not shown) disposed on the mold 10 to surround the mold chamber 5 disposed in the mold 10 Temperature air flow conduit 60 connecting the air temperature regulating section 30 and the mold chamber 5 and an air vent conduit 70 passing through the mold 10 and connecting the mold chamber 5 to the outside, Lt; / RTI >

The method comprises the steps of: supplying the resin-coated sand from the core supply part (20) to the mold chamber (5); Blowing hot air into the mold chamber (5) through the air supply (40) and the hot air flow duct (60); And discharging the hot air circulated between the resin-coated sand loaded in the mold chamber (5) through the air vent duct (70) formed to communicate with the mold chamber (5) from the outside.

The method further includes heating the mold 10 itself through the mold temperature regulating unit 50 at the same time as blowing the hot air into the mold chamber 5.

The mold 10 includes an upper mold 11 and a lower mold 13 disposed at a lower portion of the upper mold 11. The hot air flow duct 60 and the air vent duct 70 are connected to the upper mold 11, Is disposed on the upper mold (11) and the lower mold (13).

As described above, the method for manufacturing the core using resin-coated sand (RCS) according to the present invention is capable of producing castings of bainite structure, except for the heat treatment process, at the same time as the product extraction in the casting process.

In the case of a general casting process, since the product is taken out at a temperature of 400 ° C. or lower after the injection of the molten metal, the cooling time takes several hours. On the other hand, when the method according to the present invention is applied, By taking out at a high temperature, the product can be taken out in a few minutes, resulting in high productivity. It is also possible to develop parts with various properties by controlling the casting structure through a bainite structure on a region capable of imparting a function through a temperature measurement or on a specific region of the product.

The present invention has a limitation in that it is impossible to obtain a suitable sintering condition when the shape of the core is complicated or the thickness deviation is large. Since the hot air is blown into the mold and sintered, At the same time, the present invention provides a method of securing a constant sintering condition irrespective of the shape and thickness as compared with the conventional process.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the overall structure of an apparatus for carrying out a method of manufacturing a core using resin-coated sand (RCS) according to the present invention.
FIG. 2 shows a process of sequentially feeding resin-coated sand (RCS) and hot air into a mold.
3 is a view showing a specific configuration of the air temperature control unit.
FIG. 4 is a block diagram for explaining a manufacturing process of a core using a resin-coated sand (RCS) according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

Hereinafter, referring to FIG. 1, an apparatus for manufacturing a Chinese character using a resin-coated sand (RCS) according to the present invention will be described.

The resin-coated sand (RCS) manufacturing machine includes a mold 10 in which a mold chamber 5 as an internal space for accommodating and receiving resin-coated sand is formed, a mold 10 for supplying resin-coated sand through one side of the mold 10, An air supply unit 40 for supplying air to the mold 10, an air temperature control unit 30 for enabling temperature change with respect to air supplied from the air supply unit 40, a mold 10, A mold temperature control unit 50 disposed on the mold 10 in a form surrounding the mold chamber 5 disposed in the mold 10 to control the mold 10 to connect the mold chamber 5 and the outside of the mold 10, And an air vent conduit 70 passing through the mold 10 and connecting the mold chamber 5 to the outside.

The flow conduit (60) includes an RCS flow conduit (61) and an air flow conduit (65). On the other hand, the flow conduit 60 enables the supply in a manner that selectively supplies RCS or air by constituting an integrated pipeline as another embodiment.

The mold 10 has a pair of molds arranged symmetrically along the upper and lower directions. Specifically, the metal mold 10 includes an upper metal mold 11 and a lower metal mold 13 disposed under the upper metal mold 11. A mold chamber (5) is disposed between the upper mold (11) and the lower mold (13).

The core feeder 20 includes a metering hopper 23 detachably connected to the lower end of the RCS feed hopper 21 and the core feed hopper 21.

The metering hopper 23 supplies the resin coated sand through the RCS flow conduit 61 in a state where the metering hopper 23 is supplied to the upper end side of the upper mold 11 after being supplied by the predetermined dosing amount from the RCS supply hopper 21 . In the course of supplying the resin-coated sand, the resin-coated sand is supplied into the mold chamber 5 through a separate air-blowing device 25 disposed on the metering hopper 23. Meanwhile, the metering hopper 23 supplies the resin-coated sand through the process of directly coupling the RCS supply nozzle 231 disposed at the lower end thereof to the flow conduit 60.

The air temperature control unit 30 heats the air supplied from the air supply unit 40 to a preset temperature range and supplies the air to the mold chamber 5 through the air flow duct 65.

The air temperature regulating section 30 includes a hollow heat-resistant pipe 31, a hot wire 32 disposed along the axial direction in the heat-resistant pipe 31, and a connector module 33 coupled to one end of the heat- . On the connecting module 33, the power supplied to the hot wire 32 is adjusted while the power supply / control device is connected. That is, the air supplied into the mold chamber 5 is instantaneously heated to a preset temperature in the range of 150 to 300 ° C to mold the RCS at a high temperature. On the other hand, an air supply line is connected to one side of the connecting module 33.

As described above, the hot-pressed hot air is blown into the mold 10 to sinter the resin-coated sand, thereby controlling the micro-bonding according to the shape of the core, and at the same time, .

On the other hand, the mold temperature regulating unit 50 may be configured to surround the mold chamber 5 and to heat the mold 10 itself using a heating element using electrical resistance.

That is, the present invention enables the sintering process of the resin-coated sand supplied by supplying hot air to the mold chamber 5 and heating the mold 10 itself through the mold temperature regulating part 50.

On the other hand, the process of supplying hot air to the mold chamber 5 or the step of heating the mold 10 itself through the mold temperature control unit 50 can be performed individually.

The air vent duct 70 discharges the air that has passed through the resin coating sand through the lower side of the lower mold 13 to the outside of the mold 10.

The present invention can be limited to disposing the flow duct 60 and the air vent duct 70 on the upper mold 11 and the lower mold 13, respectively.

In general, in order to obtain the Ostustrup cast iron, there is a disadvantage that the cast obtained through the casting process must be reheated to a target temperature of 200 to 950 degrees Celsius for performing the tempering treatment for the tempering. However, The casting is taken out at a desired temperature of about 900 ° C. during the cooling of the molten metal and quenching in a salt bath having a temperature in the range of 200 ° C. to 400 ° C. so that the cast iron can be produced directly without heat treatment.

Hereinafter, referring to FIG. 4, a method for manufacturing a core material using resin-coated sand (RCS) will be described.

First, the resin-coated sand is prepared on the core supplying portion 20.

The mold 10 is combined to mold the mold chamber 5 on the inner space thereof.

The resin coated sand injected from the RCS feed hopper 21 into the metering hopper 23 is supplied to the mold chamber 5 through the upper mold 11 through the air blowing device 25 and a separate compressor.

And blows hot air into the mold chamber (5) through the flow conduit (60).

The blowing step supplies hot air to the resin-coated sand through a flow conduit 60 formed inside the mold 10.

Meanwhile, at the same time, the mold 10 itself can be heated through the mold temperature regulating part 50. [

Through the above process, the resin-coated sand is sintered.

Thereafter, the hot air circulated through the resin-coated sand loaded in the mold chamber 5 is discharged through the air vent duct 70 formed in the mold 10 so as to connect the mold chamber 5 to the outside.

Next, the mold is separated, the sintered core is taken out, and at the same time, quenching is carried out in a salt bath having a temperature in the range of 200 to 400 degrees, thereby making it possible to directly produce the Ostustrup cast iron without the heat treatment process.

Then, the extracted core is assembled.

Thereafter, the mold is assembled using the core and the casting process is performed.

As described above, there is a limit in that the sintering condition can not be obtained when the shape of the core is complicated or when the thickness deviation is large, because the method of manufacturing the sintered body using the resin coated sand according to the present invention has the limitation that the hot air is blown into the mold ), Thereby controlling the microbeds according to the shape of the core and ensuring a certain sintering condition irrespective of the shape and thickness as compared with the conventional process.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

A mold (10) for forming a mold chamber (5) as an internal space in which resin-coated sand is supplied and accommodated;
A core supply unit 20 for supplying resin-coated sand into the mold chamber 5 through one side of the mold 10;
An air supply unit 40 for supplying air to the mold chamber 5 of the mold 10;
An air temperature control unit 30 for enabling temperature variation with respect to air supplied from the air supply unit 40;
A mold temperature control unit 50 disposed on the mold 10 in a form surrounding the mold chamber 5 disposed in the mold 10;
A flow conduit 60 formed in the mold 10 to connect the mold chamber 5 and the outside of the mold 10; And
And an air vent conduit (70) passing through the mold (10) and connecting the mold chamber (5) to the outside,
The mold 10 includes an upper mold 11 and a lower mold 13 disposed at a lower portion of the upper mold 11. A mold chamber 5 is interposed between the upper mold 11 and the lower mold 13, Wherein the flow conduit 60 includes an RCS flow conduit 61 and an air flow conduit 65 disposed on the upper mold 11,
The air vent conduit 70 discharges the air having passed through the resin coating sand through the lower side of the lower mold 13 to the outside of the mold 10,
The temperature of the resin-coated sand charged in the mold chamber 5 is increased by using the high-temperature air through the air supply unit 40 and the air temperature control unit 30, thereby forming the core through the sintering process,
The central supply unit 20 includes an RCS supply hopper 21 and a metering hopper 23 detachably connected to the lower end of the middle supply hopper 21. The metering hopper 23 has a predetermined metering value Is supplied from the RCS supply hopper 21 and then supplied to the upper end side of the upper mold 11 to supply the resin coated sand through the RCS flow conduit 61 constituting the flow conduit 60,
The air temperature adjusting unit 30 heats the air supplied from the air supplying unit 40 to a predetermined temperature range and supplies the heated air to the mold chamber 5 through the air flow duct 65,
The air temperature adjusting unit 30 includes a hollow heat-resistant pipe 31, a heat line 32 disposed along the axial direction in the heat-resistant pipe 31, The air supplied into the mold chamber 5 is instantaneously heated to a predetermined temperature in the range of 150 to 300 DEG C in a state including the molding module 33 for regulating the electric power supplied to the hot wire 32, And hot air at a high temperature is blown into the mold 10 to sinter the resin-coated sand so as to control the fine particles according to the shape of the core,
In this way, high-temperature air is supplied to the mold chamber (5), and the mold (10) is heated through the mold temperature control unit (50) to enable sintering of the supplied resin-
An apparatus for manufacturing hollow fibers using resin coated sand (RCS).
The method according to claim 1,
The central supply unit 20,
A RCS feed hopper 21 and a metering hopper 23 detachably connected to the lower end of the RCS feed hopper 21,
The resin coated sand injected onto the weighing hopper 23 in the RCS supply hopper 21 is supplied to the inside of the mold chamber 5 through the air blowing device 25 disposed above the weighing hopper 23 doing,
An apparatus for manufacturing hollow fibers using resin coated sand (RCS).
A mold 10 in which a mold chamber 5 as an internal space in which resin-coated sand is supplied and accommodated is formed; a core supply portion 20 for supplying resin-coated sand through one side of the mold 10; An air temperature control unit 30 for enabling the temperature to be varied with respect to the air supplied from the air supply unit 40 and a mold surrounding the mold chamber 5 disposed in the mold 10 A flow path 60 formed in the mold 10 to connect the mold chamber 5 and the outside of the mold 10, And an air vent conduit (70) passing through the mold (10) and connecting the mold chamber (5) to the outside, the method comprising the steps of:
The mold 10 includes an upper mold 11 and a lower mold 13 disposed at a lower portion of the upper mold 11. A mold chamber 5 is interposed between the upper mold 11 and the lower mold 13, Wherein the flow conduit 60 includes an RCS flow conduit 61 and an air flow conduit 65 disposed on the upper mold 11,
The air vent conduit 70 discharges the air having passed through the resin coating sand through the lower side of the lower mold 13 to the outside of the mold 10,
Supplying the resin-coated sand from the core feeder (20) to the mold chamber (5);
Blowing hot air into the mold chamber (5) through the air supply (40) and the flow conduit (60); And
And discharging high-temperature air circulated between the resin-coated sand loaded in the mold chamber (5) through the air vent duct (70) formed to communicate with the mold chamber (5)
In the step of supplying the resin-coated sand,
The weighing hopper 23 constituting the middle supply part 20 is supplied with the predetermined metering value from the RCS supply hopper 21 and then transferred to the upper end side of the mold 10, Coated sand through the RCS flow conduit 61 and supplies the resin-coated sand to the mold chamber 5 through an air blowing device 25 disposed on the metering hopper 23 ,
In the step of blowing high-temperature air to the mold chamber 5, the air temperature adjusting unit 30 heats the air supplied from the air supplying unit 40 to a predetermined temperature range, To the mold chamber 5,
The air temperature adjusting unit 30 includes a hollow heat-resistant pipe 31, a heat line 32 disposed along the axial direction in the heat-resistant pipe 31, In the state including the connector module 33 for regulating the power provided to the hot wire 32,
The air temperature regulator 30 instantaneously heats the air supplied into the mold chamber 5 to a predetermined temperature in the range of 150 to 300 ° C. and blows the RCS into the mold 10 in a state of high temperature molding Resin-coated sand is sintered to control the microspheres according to the shape of the core,
In this way, high-temperature air is supplied to the mold chamber (5), and the mold (10) is heated through the mold temperature control unit (50) to enable sintering of the supplied resin-
A method for manufacturing hollow core using RCS.
The method of claim 3,
The method comprises:
At the same time as blowing the hot air into the mold chamber (5)
Heating the mold (10) itself through the mold temperature regulating part (50)
A method for manufacturing hollow core using RCS.
delete

Images