WO2016117791A1 - 무기 바인더를 이용한 중자 및 주조품의 제조방법 - Google Patents

무기 바인더를 이용한 중자 및 주조품의 제조방법 Download PDF

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Publication number
WO2016117791A1
WO2016117791A1 PCT/KR2015/009945 KR2015009945W WO2016117791A1 WO 2016117791 A1 WO2016117791 A1 WO 2016117791A1 KR 2015009945 W KR2015009945 W KR 2015009945W WO 2016117791 A1 WO2016117791 A1 WO 2016117791A1
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WIPO (PCT)
Prior art keywords
yarn
core
inorganic binder
kneading
hopper
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PCT/KR2015/009945
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English (en)
French (fr)
Korean (ko)
Inventor
박정욱
김우천
권기명
이만식
김명환
배민아
Original Assignee
주식회사 디알액시온
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Application filed by 주식회사 디알액시온 filed Critical 주식회사 디알액시온
Priority to JP2017528960A priority Critical patent/JP6456501B2/ja
Priority to MX2017008834A priority patent/MX2017008834A/es
Publication of WO2016117791A1 publication Critical patent/WO2016117791A1/ko

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/108—Installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/12—Moulding machines for making moulds or cores of particular shapes for cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents

Definitions

  • the present invention relates to a method for producing a core using an inorganic binder, a method for producing a cast with a core made from the core, an inorganic binder, and a system for manufacturing a core using the cast and inorganic binder produced therefrom.
  • the casting foundry industry in Korea has contributed to all industries such as shipbuilding, automobile parts, industrial machinery, and machine tools.
  • the casting foundry industry is an indispensable root industry for the development of the national industry, but the surrounding environment such as environmental problems surrounding the foundry casting industry, price fluctuations of raw and subsidiary materials, policies and labor shortages are not very good.
  • environmental issues are set as a priority for the foundry foundry.
  • the casting industry is improving the environmental pollution at the casting site to block the dissolution of environmental pollutants from the melting of metals, the manufacturing of cores and the casting process, but the global warming gas emission regulations are regulated by the Muskle Act and the Kyoto Protocol.
  • the core used in the casting industry is produced by mixing sand and an organic binder to harden using a core and a mold.
  • 1 is a flowchart illustrating a process of manufacturing a core and a cast using such a conventional organic binder.
  • the core using an inorganic binder when manufacturing the core using an inorganic binder, it can be cured at low temperature and does not involve harmful substances, so the working environment is good and the casting defect is reduced due to the small amount of gas generated in the core manufacturing and casting process. Since the installation of the environmental pollution prevention facility is not required, the production cost can be reduced, but the inorganic binder has a problem of lowering the quality of the core due to hygroscopicity and sintering phenomenon.
  • the present inventors endeavored to solve the technical demands as described above, and improved the process, using the inorganic binder with improved physical properties such as water resistance, strength, casting properties, and the like to improve the hygroscopicity and sintering phenomenon
  • the present invention has been completed by developing a manufacturing method.
  • Another object of the present invention is to provide a core manufactured by the above production method.
  • Another object of the present invention is to provide a method for producing a cast product with the middle using the inorganic binder.
  • Another object of this invention is to provide the manufacturing system of the core using an inorganic binder.
  • the inorganic binder comprises 40 to 70 parts by weight of water glass, 5 to 35 parts by weight of nano silica, 0.1 to 10 parts by weight of a Li-based water resistant additive, 0.1 to 10 parts by weight of an organosilicon compound, and 1 to 10 parts by weight of anti-settling additive.
  • a method for producing cores using an inorganic binder is provided.
  • the inorganic binder is characterized in that it is mixed in 1 to 6% by weight relative to the molding yarn yarn.
  • the Li-based water resistant additive is at least one selected from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulfate, lithium bromide and lithium acetate.
  • the organosilicon compound is at least one selected from methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyldrimethoxysilane and vinyltrimethoxysilane. It is done.
  • the anti-settling additive is characterized in that at least one selected from monosaccharides, polysaccharides and disaccharides.
  • the yarn supplying step may include: supplying yarn to a four-meter lower hopper by weighing at a set capacity from an upper hopper for molding yarn yarn storage; And feeding the yarn to the kneader from the four-meter lower hopper.
  • the kneading step may include: kneading the yarn for 10 to 60 seconds by receiving the foundry yarn from the four-meter lower hopper to a kneader; And receiving an inorganic binder from the binder supply device to the kneader and kneading for 30 to 120 seconds to produce a kneaded yarn.
  • the kneading yarn is supplied from the kneading yarn hopper to the blowing head located below the kneading yarn hopper, and the kneading yarn supplied to the kneading yarn flow guide (located at the bottom inside the blowing head) Mixed sand flow guider) to distribute the kneading yarn to the top of the blowing nozzle plate.
  • the curing step preheating the core mold to 100 ⁇ 200 °C; And curing and firing the inside of the blown core.
  • a core manufactured by using the inorganic binder, prepared by the method for producing the core prepared by the method for producing the core.
  • the core is characterized by exhibiting a breakdown strength of 60% or more compared to the initial breakdown strength when exposed to environmental conditions of 20 ⁇ 30g / m 3 absolute humidity.
  • the initial tensile strength of the core is characterized in that more than 150 N / cm2.
  • a heat treatment step of heat treatment including a water quenching process of the desalted product.
  • a method for producing a cast with a middle core using an inorganic binder characterized in that the chemical degassing, which is added to the chemical decomposition solution during the water quenching step of the heat treatment step to decompose the inorganic binder remaining in the core after the mechanical desalination. do.
  • the chemical decomposition solution is a silicate solution containing sodium silicate, sodium metasilicate or a phosphate solution containing sodium phosphate, disodium phosphate.
  • a cast product for solving the other problem, characterized in that it is manufactured by a method for manufacturing a casting with the middle using the inorganic binder.
  • a four-meter lower hopper connected to a lower portion of the upper hopper and receiving a molding yarn yarn from the upper hopper to measure a set capacity and supply it to a kneader;
  • An inorganic binder supplying device for supplying the stored inorganic binder to the kneader with a set capacity
  • a kneader connected to the four-meter lower hopper and the kneader and mixing and kneading the molding yarn yarn supplied from the four-meter lower hopper and the inorganic binder supplied from the inorganic binder supply device;
  • a kneading yarn hopper receiving kneading yarn from the kneading machine and supplying kneading yarn to a blowing head;
  • a blowing head positioned below the kneading yarn hopper and receiving the kneading yarn from the kneading yarn hopper and blowing into the core mold;
  • the inorganic binder comprises 40 to 70 parts by weight of water glass, 5 to 35 parts by weight of nano silica, 0.1 to 10 parts by weight of a Li-based water resistant additive, 0.1 to 10 parts by weight of an organosilicon compound, and 1 to 10 parts by weight of anti-settling additive.
  • a system for producing cores using an inorganic binder is provided.
  • the blowing head has a mixed sand flow guide (Mixed Sand Flow Guider) at the bottom of the inside, characterized in that it further comprises a blowing nozzle plate provided with a blowing nozzle at the bottom of the kneading yarn flow guide.
  • a mixed sand flow guide Mated Sand Flow Guider
  • the manufacturing method of the core using the inorganic binder of the present invention not only the casting operation is easy but also the degassing of the casting manufactured by the casting operation is easy, and the sintering phenomenon does not appear.
  • the cast article produced by the method of manufacturing the core using the inorganic binder of the present invention may exhibit excellent surface quality and formability, as well as improved strength and fillability.
  • the present invention since it can be cured at low temperatures and does not contain harmful substances, the working environment is good, and the amount of gas generated in the core manufacturing and casting process is reduced, so that casting defects are reduced. There is no need to reduce the cost of production.
  • Figure 1 shows the manufacturing process of the core and cast using an organic binder according to the prior art.
  • Figure 2 schematically shows the manufacturing process of the core and cast using the inorganic binder according to the present invention.
  • Figure 3 shows the equipment configuration for the production of the core using the inorganic binder according to an embodiment of the present invention.
  • Figure 4 shows the results of evaluation of the strength and formability of the core using the inorganic binder prepared according to an embodiment of the present invention.
  • Figure 5 shows the breakdown strength according to the elapsed time after hardening of the core using the inorganic binder prepared according to an embodiment of the present invention and the breakdown strength according to the elapsed time of forced moisture absorption.
  • Figure 6 shows the shape and surface quality results of the core using the inorganic binder prepared according to an embodiment of the present invention.
  • Figure 7 shows the results of the evaluation of the fluidity of the core using the inorganic binder prepared according to an embodiment of the present invention.
  • Figure 8 shows the external view of the final product produced using the middle core using an inorganic binder prepared according to an embodiment of the present invention.
  • Figure 9 shows the results of the decarburization and sintering of the core using the inorganic binder prepared according to an embodiment of the present invention.
  • Figure 2 schematically shows the manufacturing process of the core and cast using the inorganic binder according to the present invention.
  • the present invention is to mix the inorganic binder and the molding yarn yarn, by using the mold heat, to produce the core using the inorganic binder, the manufactured core is not only mechanical desalination during the production of the casting, but also during heat treatment Through chemical degassing, the core is completely removed to produce a casting.
  • Figure 3 shows the configuration of the facility for the production of the core using an inorganic binder according to an embodiment of the present invention, will be described in detail by dividing the steps with reference to this.
  • the feeding step of the yarn is a step of supplying the molding yarn yarn to the kneader, as shown in Figure 3, the upper hopper for storing the molding yarn yarn at the top of the facility is provided, and weighed by the set capacity in the upper hopper Yarn is supplied to the lower hopper, and the yarn is fed from the four-meter lower hopper to the kneader.
  • the top of the upper hopper may be provided with a strainer for filtering foreign matter that may be mixed in the yarn, preferably a mesh sieve of AFS 20 or more is installed.
  • the upper hopper is composed of an upper level sensor for preventing the overflow of the molding yarn yarn
  • the lower is composed of a lower level sensor for detecting the lack of the molding yarn yarn.
  • the four weighing lower hopper is provided with a four weighing button for feeding the yarn to the kneader at a set capacity, and is programmed to select a desired yarn capacity. Therefore, when the four weighing button is operated, it takes about 20 to 60 seconds depending on the yarn supply capacity, and the 20 to 70 kg of yarn is supplied through the metering pipe inside the four weighing lower hopper.
  • a gate for supplying the yarn to the kneader after the yarn replenishment is mounted at the bottom and is provided with a lower gate on / off button to control the opening and closing of the lower gate to supply the yarn to the kneader.
  • the kneading step is to prepare a kneading yarn by kneading the liquid inorganic binder including the foundry yarn and water glass in a kneading machine.
  • the kneader includes a kneader and an inorganic binder supply device capable of supplying an inorganic binder to the kneader
  • the kneading machine is a kneading container capable of kneading by containing an inorganic binder supply on / off button, a yarn and an inorganic binder. It consists of an impeller for mixing the inorganic binder and yarn evenly, a motor for turning the impeller, an on / off button for controlling the motor stop and a volume gauge for adjusting the RPM of the kneader.
  • the inorganic binder supplying device is provided with a fixed-quantity discharge motor for quantitative supply, it is possible to build a pipe circulation system to prevent the hardening due to the stationary of the inorganic binder in the pipe.
  • the inorganic binder supply device is programmed and RPM control dial is built to control the kneading time and speed according to the content and characteristics of the yarn and the inorganic binder.
  • the upper part of the kneader has a gate for replenishing the yarn and inorganic binder, the open / closed type lid is installed for cleaning and checking the inside of the kneader, the kneader manufactured on the side of the kneader A kneading yarn drainage gate for supplying to the kneading yarn hopper is mounted, and a yarn on / off button is provided.
  • This is referred to as a 'boat suit' below.
  • the vibrator (vibrator) is installed in the lower portion of the ship chute so that the kneader can be supplied without stagnation during discharge, it operates only while pressing the ship ON button and is programmed to set the vibrator time during continuous (automatic) operation.
  • the kneader rotates at 60 to 150 RPM, and when kneading, first, the four-meter lower hopper gate is opened, the yarn is fed into the kneader, and the impeller rotates at the same time.
  • the first kneading is carried out to spread the yarn evenly for 10 to 60 seconds.
  • the impeller continues to rotate, and presses the inorganic binder supply ON button, and supplies 1 to 6% by weight of the liquid inorganic binder with respect to the amount of sand from the inorganic binder supply device, depending on the binder content.
  • Second kneading is carried out so that the liquid inorganic binder and the yarn are evenly mixed for a second.
  • the inorganic binder includes 40 to 70 parts by weight of water glass, 5 to 35 parts by weight of nano silica, 0.1 to 10 parts by weight of a Li-based water resistant additive, 0.1 to 10 parts by weight of an organosilicon compound, and 1 to 10 parts by weight of anti-settling additive.
  • the nano-silica is a silicon dioxide (SiO 2 ) particles having a structure with a particle size of 5 ⁇ 20 nanometers, the fine pores come out parallel to the surface of the particles, or because the direction of the pores is irregular, the external material It is difficult to access easily.
  • SiO 2 silicon dioxide
  • the nano-silica is included in more than 35 parts by weight, there is a problem in that the fluidity of the inorganic binder is lowered and the curing is inhibited by the excess silica particles, preferably 5 to 35 parts by weight.
  • the Li-based water-resistant additive is at least one selected from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulfate, lithium bromide and lithium acetate
  • the Li-based water-resistant additive is as high as SiO 2 concentration of water glass Even when the molar ratio is close to 8, it is stable at room temperature and has a low viscosity.
  • the Li-based water-resistant additive has a mixed alkali effect with Na ions in the water glass, thereby improving the water resistance while enhancing the chemical durability of the finished inorganic binder.
  • the Li-based water-resistant additive when included in more than 10 parts by weight, the chemical durability and water resistance is lowered due to the collapse of the network structure of the inorganic binder, the Li-based water-resistant additive is 0.1 to the inorganic binder of the present invention It is preferable to include from 10 parts by weight.
  • the organosilicon compound has an organic functional group and a hydrolyzable group that can react with the inorganic material in the same molecule, and can function to combine the organic material and the inorganic material.
  • This improves the mechanical strength and water resistance of the inorganic binder composition of the present invention to improve the quality, it serves to give hydrophobicity.
  • the organosilicon compound is one selected from tetraethoxysilane, methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane and vinyltrimethoxysilane. It is characterized by the above.
  • the organosilicon compound is to be included 0.1 to 10 parts by weight in the inorganic binder of the present invention. This is because when the organosilicon compound is more than 10 parts by weight, the price of the inorganic binder may be increased and the physical properties of the final inorganic binder composition may be lowered.
  • Anti-settling additive in the present invention is characterized in that at least one selected from monosaccharides, polysaccharides and disaccharides.
  • the monosaccharide is at least one selected from glucose, fructose, manos, galactose, glucose and ribose
  • the polysaccharide is at least one selected from starch, glycogen, cellulose, chitin and pectin
  • the disaccharide is one or more selected from maltose, sugar, lactose, maltose and lactose.
  • the inorganic binder includes nanosilica, Li-based water-resistant additives, organosilicon compounds, and sugars as additives in water glass to increase the bonding strength between the binder compositions and improve the strength of the binder and the water resistance and water repellency of the binder composition.
  • nanosilica Li-based water-resistant additives, organosilicon compounds, and sugars as additives in water glass to increase the bonding strength between the binder compositions and improve the strength of the binder and the water resistance and water repellency of the binder composition.
  • a supply device for supplying the additive may be additionally installed.
  • an inorganic additive or a curing agent may be added to further improve the strength, flexibility, and hardness of the core.
  • the curing agent is preferably at least one selected from sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonine, sodium phosphate, disodium phosphate, trisodium phosphate and sodium sulfate.
  • the curing agent is more preferably contained in an amount of 0.1 to 5.0 parts by weight based on the total weight of the inorganic binder composition.
  • the step of discharging is a step of transferring the kneading yarn prepared in the kneading step to the kneading yarn hopper. It may take about 30 to 60 seconds depending on the amount of kneader.
  • the constituent equipment of the kneader hopper is a kneader storage box for storing a certain amount of kneading yarn, a level sensor for detecting a kneading yarn shortage inside the kneading yarn hopper and instructing a resupply command, and kneading on the kneading hopper upper portion
  • the kneader hopper gate that can be opened and closed during the feeding, the kneader hopper from the kneader hopper to the blowing head on the side of the kneader hopper is easy to supply when feeding the kneader, and the vibrator to prevent the kneader stagnation. It can be configured as a sagate for resupply to the blowing head.
  • the vibrator and kneader hopper of the kneader in vibrates simultaneously and feeds the kneader through the ship suit. After supplying the kneader to the kneader hopper, close the boat gate and close the kneader hopper gate. After the replenishment, the vibrator stops vibrating.
  • the yarn feeding step is a step of supplying the kneading yarn supplied to the kneading yarn hopper in the discharge step to the blowing head.
  • the blowing head is a facility for blowing the kneading yarn into the mold using a proper pressure into the mold, and when the kneading yarn is supplied to the blowing head, the sagate at the bottom of the kneading yarn hopper and the kneading yarn gate at the top of the blowing head are When the vibrator of the kneader hopper vibrates, the kneading yarn is supplied to the blowing head. After the proper amount has been supplied, it is closed by a limit sensor installed above the blowing head.
  • the blowing head has a mixed sand flow guide (Mixed Sand Flow Guider) at the bottom inside, and further includes a blowing nozzle plate provided with a blowing nozzle at the bottom of the kneading yarn flow guide.
  • a mixed sand flow guide Mated Sand Flow Guider
  • the kneading yarn is fed from the kneading yarn hopper to the blowing head located below the kneading yarn hopper, and the kneading yarn supplied to the kneading yarn is located at the bottom of the inside of the blowing head. ) To the top of the blowing nozzle plate. The process may take 2 to 10 seconds depending on the amount of kneading.
  • the blowing step is a step of blowing the kneaded yarn spread in the blowing head into the core mold having a desired shape.
  • the blowing head may be configured to circulate the cooling water therein to maintain a constant temperature.
  • the main components include a coolant nozzle for plugging the coolant, a kneader gate that can be opened and closed when the kneader is fed, a sensor that detects the overflow or lack when the kneader is fed, and a kneader into the mold with a certain pressure. It can be composed of blowing nozzle for blowing, nozzle rubber to prevent breakage of nozzle tip during blowing, regulator installed to control blowing pressure according to kneading yarn characteristics during blowing, and programming to adjust blowing time for adjusting suction volume Be sure to
  • the blowing head is located under the kneader hopper so that the kneading yarn can be supplied and moves to the core mold when the kneading yarn is finished.
  • the blowing head moved to the upper part of the heavy metal die is lowered and the nozzle is inserted into the blowing hole in the upper part of the mold to blow the kneading yarn inside the mold at a constant pressure.
  • the evacuation step is a step for releasing the internal pressure after blowing the kneaded yarn into the mold at a constant pressure.
  • a silencer may be installed to remove noise due to high pressure during exhaustion, and is programmed to adjust the exhaust time.
  • the curing step after preheating the core mold, the step of curing and firing the inside of the blown core.
  • the method includes preheating the core mold to 100 to 200 ° C. and curing and firing the blown core inside.
  • the heating system can be configured in the mold to be preheated to the appropriate temperature, can be configured to maintain a constant temperature by mounting a temperature sensor between each mold, and to be programmed to select the firing time.
  • the take-out step is a step in which the blown kneader is cured as the curing step is completed and produced as a core to take out the final product.
  • the mold consisting of the upper mold and the lower mold or the left / right mold is separated, and the extraction pin installed at the lower portion of the mold may move the core to an easy position to take out the core, and then take out the core produced by a machine or hand.
  • the extracted core has a feature of improving water resistance and strength by being manufactured using an inorganic binder.
  • the core of the present invention prepared by using the inorganic binder by the above-described method in particular, the present invention can satisfy the water resistance and strength even at high temperature and humidity in summer, 3 in environmental conditions of 20 ⁇ 30g / m 3 absolute humidity When exposed to time, it may exhibit more than 60% of the strength of the initial strength.
  • relative humidity 60 ⁇ 70% (absolute humidity 20 ⁇ 30g / m 3 ) after 3 hours moisture resistance showed more than 60% of the initial strength
  • the core of the present invention was found to have an initial strength of 150 N / cm 2 or more, and the strength of breakage was maintained at 150 N / cm 2 or more even after 3 hours of invasion at environmental conditions of 20 to 30 g / m 3 absolute humidity.
  • the core is manufactured using an environmentally friendly inorganic binder, and the cast is manufactured using the same.
  • the method of manufacturing the cast using the middle binder using the inorganic binder of the present invention includes the core Storing the core using an inorganic binder prepared by the manufacturing method of; A casting step of manufacturing a product by pouring a molten metal of a predetermined material into a mold having a predetermined shape by using the stored middle core; Mechanical decarburization step of removing the core used in the casting step; And a heat treatment step including a water quenching process of the desalted product, wherein the inorganic binder remains in the core after adding the chemical decomposition solution during the water quenching process during the heat treatment step. It is characterized by chemical degassing, which decomposes.
  • the storage step is a step of storing the core in a sealed space to maintain a constant temperature / humidity of the core produced by the above-described method is complete taking out.
  • the temperature is 10 to 30 °C
  • the humidity is 10 to 50% is suitable.
  • the casting step is a step of producing a product by pouring a molten metal (meaning a state of melting the raw material to make a liquid state) of the desired material by using the stored middle core in a mold having a predetermined shape.
  • a molten metal meaning a state of melting the raw material to make a liquid state
  • the mechanical decarburization step is to remove the cores used for casting the product by applying a constant pressure, vibration, or rotation to the core inside the product.
  • the heat treatment step is a heat treatment step of performing a heat treatment to supplement the mechanical and physical properties of the desautized product, in particular, a water quenching (Water Quenching) process of the heat treatment step, the water quenching process of the inorganic binder Chemical degassing is performed by adding a chemical decomposition solution to water to completely decompose the inorganic binder remaining in the core after the mechanical degassing through chemical decomposition. That is, after the mechanical quenching in the water quenching (Water Quenching) process is carried out the process of chemically degassing by charging the hardened residual sand inside the casting in a water tank to which the chemical decomposition solution is added.
  • Water Quenching Water Quenching
  • a silicate solution including sodium silicate and sodium metasilicate or a phosphate solution including sodium phosphate and disodium phosphate may be used, and the concentration is preferably 1 to 30 mol%.
  • the cast product manufactured using the inorganic binder may exhibit excellent surface quality and formability, as well as improved strength and fillability.
  • bar can be produced using an environmentally friendly inorganic binder, the production system of the core using the inorganic binder of the present invention, the upper hopper for storing the molding yarn yarn; A four-meter lower hopper connected to a lower portion of the upper hopper and receiving a molding yarn yarn from the upper hopper to measure a set capacity and supply it to a kneader; An inorganic binder supplying device for supplying the stored inorganic binder to the kneader with a set capacity; A kneader, connected to the four-meter lower hopper and the kneader, for mixing and kneading the molding yarn yarn supplied from the four-meter lower hopper and the inorganic binder supplied from the inorganic binder supply device; A kneading yarn hopper receiving kneading yarn from the kneading machine and supplying kneading yarn to a blowing head; A blowing head positioned
  • the blowing head may include a blended sand flow guider (Mixed Sand Flow Guider) at the bottom of the inside, and may further include a blowing nozzle plate having a blowing nozzle at the bottom of the kneading yarn flow guide.
  • a blended sand flow guider Mated Sand Flow Guider
  • An inorganic binder was prepared by adding and synthesizing a Li-based water resistant additive, nano silica and an organosilicon compound to water glass, and the hygroscopicity of the inorganic binder was evaluated by the binder residual ratio.
  • Table 1 shows the composition and the hygroscopic evaluation results of the inorganic binder.
  • the organosilicon compound does not contribute significantly to improving the water resistance of the inorganic binder, but as the content of the organosilicon compound increases It was confirmed that the viscosity was lowered.
  • the inorganic binder samples 1 to 12 prepared in Example 1 were added so as to include all of the Li-based water-resistant additive, nano silica, and organosilicon compounds, and disaccharide, polysaccharide, and monosaccharide 1 as anti-settling additives.
  • an inorganic binder including all of the Li-based water resistant additive, the nano silica, the organosilicon compound, and the anti-settling additive was prepared, and a core was prepared using the same.
  • composition of the prepared inorganic binder is shown in Table 2 below.
  • the manufacturing process of the core is as follows.
  • a 1 to 6% liquid inorganic binder was mixed with AFS 55 Vietnamese yarn and AFS 55 dry sand in a mixer, and kneaded for 100 to 160 seconds to prepare a kneaded yarn.
  • the core was prepared by injecting and kneading the kneaded yarn at a pressure of 1 to 10 bar into a mold heated to 130 to 150 ° C.
  • the prepared core was taken out and cooled to room temperature.
  • the molten aluminum material is formed in a predetermined shape using the core.
  • the product was cast into a mold with.
  • mechanical desalination was performed to remove the core inside the product.
  • heat treatment is performed to complement the mechanical and physical properties of the cast product, and during the water quenching process, sodium silicate solution is added to water to completely decompose the binder remaining in the core after desalting through chemical decomposition.
  • sodium silicate solution is added to water to completely decompose the binder remaining in the core after desalting through chemical decomposition.
  • the binder was completely removed.
  • the binder is completely removed as shown in FIG.
  • the strength of the core of the core according to the composition of the inorganic binder prepared in Example 2 was evaluated.
  • the cores manufactured using the A company-1 inorganic binder and A company-2 inorganic binder, which have been commercially available and used, were also evaluated.
  • the inorganic binder (commercially available company A-1 binder) that is conventionally used commercially appeared that the strength of the inorganic binder prepared by adding the additive according to the present invention is more excellent, which is used in the present invention It is believed that the binder is complemented by each additive composition to improve the strength of the core.
  • the initial strength corresponding to 1min of the inorganic binder core is somewhat similar, but the strength increase effect of 2min is higher than that of other inorganic binders, and the maximum strength is equivalent to that of a commercially available inorganic binder (A company-2 binder). .
  • the commercially available inorganic binder showed a significant decrease in the moisture absorption strength
  • the inorganic binder according to the present invention showed the highest moisture absorption strength, and it was confirmed that the initial strength was maintained even after 3 hours.
  • the degree of decrease in the moisture absorption strength also showed a gentle slope, it was confirmed that the moisture resistance to moisture absorption is the most excellent. From this, it is considered to be the easiest to use considering the climatic conditions of Korea which has summer (rainy season).
  • Example 2 For the core manufactured in Example 2, the physical property evaluation was carried out by dividing the core molding and casting, the results are shown in Figures 6 to 9 and Table 4 below.
  • Figure 6 shows the results of the evaluation of the formation, referring to this, the formation is good, it was confirmed that there is no significant difference in the quality surface compared to the case of using a commercially available inorganic binder.
  • Figure 7 shows the results of the evaluation of the fluidity, referring to this, the kneading yarn in the kneader hopper is discharged without clogging the inside of the blowing head filling and the kneading yarn is evenly distributed in a triangular shape when confirming the kneading angle of repose of the kneader filled inside the blowing head It was confirmed. This means that the kneader is filled up to the tip of the nozzle, so there is no problem in the flowability.
  • Figure 8 shows the external view of the final product produced by casting using the core manufactured according to the embodiment, as a result of desalination and quenching, kneading yarn was not found inside the casting after desalting, no quenching .
  • FIG. 9 is an internal shape when cut as shown in FIG. 8, when the cast product having the shape as shown in FIG. 8 is obtained when the product is cast and produced using the core manufactured according to the embodiment shown in FIG. 6. A part of was shown, and it was confirmed that no quenching occurred in both mechanical and chemical killing. This means that the adhesion is improved by the physical properties of the inorganic binder.
  • Table 4 division Comparative evaluation Use of the inorganic binder of Example 2 Use A company-1 binder Middle magnetic molding liquidity ⁇ ⁇ Fillability ⁇ ⁇ burglar ⁇ ⁇ Moisture resistance ⁇ ⁇ Surface quality ⁇ ⁇ Nozzle clogging ⁇ X casting Castability ⁇ ⁇ Desorption (sintering) ⁇ ⁇ Roughness ⁇ ⁇ Product defect ⁇ ⁇ Hazardous Gas Generation ⁇ ⁇

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Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101604098B1 (ko) * 2015-06-15 2016-03-16 (주)원종기계 무기바인더 중자 제조장치
CN105665616A (zh) * 2016-02-17 2016-06-15 安徽索立德铸业有限公司 一种砂型铸造粘结用粘土添加剂
CN106862480B (zh) * 2017-01-23 2019-03-12 中国第一汽车股份有限公司 一种高模数无机粘结剂
CN110740825B (zh) * 2017-06-13 2021-08-31 韩国生产技术研究院 闭循环砂再生铸件制造系统、铸件制造监控系统及配备于其的洗涤装置
DE102017114628A1 (de) 2017-06-30 2019-01-03 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung einer Formstoffmischung und eines Formkörpers daraus in der Gießereiindustrie sowie Kit zur Anwendung in diesem Verfahren
CN107363228A (zh) * 2017-09-09 2017-11-21 泽州县金秋铸造有限责任公司 一种自动化制芯设备
KR101935168B1 (ko) 2017-09-26 2019-04-11 주식회사 영신코아 성형코어 배출장치
KR102054449B1 (ko) * 2018-08-24 2019-12-10 주식회사 디알액시온 무기 바인더 및 원사 균질 교반 혼련사 제조 장치
KR102176149B1 (ko) 2018-12-04 2020-11-09 한국생산기술연구원 용융형 중자를 이용하여 중공 구조를 갖는 중공 휠을 제조하는 방법
KR102041831B1 (ko) 2019-07-03 2019-11-06 주식회사 영신특수코아 중자 제조 장치
KR102041806B1 (ko) 2019-07-03 2019-11-07 주식회사 영신특수코아 중자 제조 장치용 이송 장치
KR102041801B1 (ko) 2019-07-03 2019-11-07 주식회사 영신특수코아 중자 제조 장치용 코어성형 장치
JP7207285B2 (ja) * 2019-12-19 2023-01-18 トヨタ自動車株式会社 中子造型装置
JP7188375B2 (ja) * 2019-12-19 2022-12-13 トヨタ自動車株式会社 中子造型装置
KR102227647B1 (ko) * 2019-12-19 2021-03-15 한국전자기술연구원 사형주조공법용 사형 및 그의 제조방법
CN111283144B (zh) * 2020-02-29 2020-09-29 淮北市万都工贸有限责任公司 一种砂型铸造制芯工艺
KR102595277B1 (ko) * 2021-03-25 2023-10-27 한국생산기술연구원 3d 프린팅용 무기 바인더 및 그 제조방법
KR102400363B1 (ko) 2021-10-29 2022-05-20 주식회사 디알액시온 밀핀 히터를 이용한 중자 성형장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07155900A (ja) * 1993-12-01 1995-06-20 Nissan Motor Co Ltd ガス硬化鋳型の造型装置
KR20090011520A (ko) * 2007-07-26 2009-02-02 현대자동차주식회사 주물용 중자 성형장치 및 그 장치의 성형 방법
KR101199111B1 (ko) * 2009-10-30 2012-11-09 현대자동차주식회사 주물용 중자 재료 혼합물, 주물용 중자 제조방법 및 이를 이용하여 제조된 주물용 중자

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
CH646351A5 (de) * 1979-11-01 1984-11-30 Fischer Ag Georg Verfahren zum herstellen einer giessform und formmaschine zur durchfuehrung des verfahrens.
JP2579825B2 (ja) * 1990-02-23 1997-02-12 株式会社小松製作所 鋳型造型法
US6467525B2 (en) * 2000-07-24 2002-10-22 Hormel Foods, Llc Gelatin coated sand core and method of making same
CN100503081C (zh) * 2006-07-18 2009-06-24 沈阳汇亚通铸造材料有限责任公司 一种铸造造型、制芯用粘结剂及其制备方法
DE102006049379A1 (de) * 2006-10-19 2008-04-24 Ashland-Südchemie-Kernfest GmbH Phosphorhaltige Formstoffmischung zur Herstellung von Giessformen für die Metallverarbeitung
IT1398989B1 (it) * 2009-07-10 2013-03-28 Drocco Linea e metodo di dosaggio e miscelazione per pitture e prodotti.
DE102012207724A1 (de) 2012-05-09 2013-11-14 Continental Automotive Gmbh Verfahren zum Messen des Füllstandes einer Flüssigkeit
JP2014018851A (ja) * 2012-07-23 2014-02-03 Asahi Tec Corp 中子の製造方法および中子
JP5986498B2 (ja) * 2012-12-19 2016-09-06 旭有機材株式会社 コーテッドサンドの製造方法及び鋳型の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07155900A (ja) * 1993-12-01 1995-06-20 Nissan Motor Co Ltd ガス硬化鋳型の造型装置
KR20090011520A (ko) * 2007-07-26 2009-02-02 현대자동차주식회사 주물용 중자 성형장치 및 그 장치의 성형 방법
KR101199111B1 (ko) * 2009-10-30 2012-11-09 현대자동차주식회사 주물용 중자 재료 혼합물, 주물용 중자 제조방법 및 이를 이용하여 제조된 주물용 중자

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BAE, MIN A ET AL.: "Evaluation for Intensity and Water Resistance of Inorganic Binder according to Addition of Si02 Promoter.", 2014 AUTUMN MEETING OF THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 14 November 2014 (2014-11-14), pages 134 *
HA, SANG HO ET AL.: "Evaluation for Water Resistance of Inorganic Binder according to Molar Ratio of SiO2/Na2O.", 2014 AUTUMN MEETING OF THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 14 November 2014 (2014-11-14), pages 136 *

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