WO2016113879A1 - 低圧鋳造方法及び低圧鋳造装置 - Google Patents
低圧鋳造方法及び低圧鋳造装置 Download PDFInfo
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- WO2016113879A1 WO2016113879A1 PCT/JP2015/050947 JP2015050947W WO2016113879A1 WO 2016113879 A1 WO2016113879 A1 WO 2016113879A1 JP 2015050947 W JP2015050947 W JP 2015050947W WO 2016113879 A1 WO2016113879 A1 WO 2016113879A1
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- mold
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- molten metal
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- 238000005266 casting Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 61
- 239000002184 metal Substances 0.000 claims abstract description 61
- 238000001035 drying Methods 0.000 claims abstract description 16
- 230000006837 decompression Effects 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000011900 installation process Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 230000007547 defect Effects 0.000 description 10
- 239000004576 sand Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 8
- 239000003463 adsorbent Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/18—Finishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
Definitions
- the present invention relates to a low pressure casting method and a low pressure casting apparatus, and more particularly to a low pressure casting method and a low pressure casting apparatus capable of preventing gas defects.
- the molten metal discharged from the melting furnace has high cleanliness by removing inclusions such as hydrogen gas, oxides, and intermetallic compounds by flux treatment and degassing treatment.
- inclusions such as hydrogen gas, oxides, and intermetallic compounds.
- the core installed in the mold contains moisture, resin, and the like, and the moisture, resin, and the like are vaporized by the heat of the molten metal and become a gas generation source. If this gas remains inside the molded product, gas defects or shrinkage cavities will occur and the quality of the molded product will deteriorate.
- moisture is a source of hydrogen gas that causes the molded product to become hydrogen embrittled, and in order to improve the quality of the molded product, it is important to remove moisture and the like that are vaporized by the heat of the molten metal.
- the moisture is also contained in the air, and air enters the cavity when the mold is opened. Further, in order to prevent the core installed in the mold from containing moisture, it is necessary to store the core in a humidity-controlled room, which requires a large amount of cost for storing the core.
- Patent Document 1 discloses that the mold itself and the core itself formed of casting sand are attached with a pipe for sucking gas, and while supplying molten metal to the cavity, the mold itself and It is disclosed that the inside of the core itself is sucked to partially reduce the pressure, and the gas generated from the inside of the mold itself or the core itself is sucked. And according to the said method, it is disclosed that the gas produced by thermal decomposition of the organic binder contained in the mold or the like is prevented from entering the molten steel, and the occurrence of gas defects can be prevented.
- Patent Document 2 discloses that the method of sending hot air into the cavity and drying the sand mold facing the cavity can remove only the water present in the surface layer of the sand mold.
- adsorbents such as zeolite or ALC is disclosed. That is, it is disclosed that the casting sand forming the mold is surrounded by an adsorbent such as zeolite or ALC, and moisture is adsorbed and removed to the inside of the casting sand by the adsorbent.
- a core is formed by a sand mold formed of cast sand, an adsorbent embedded in the sand mold, and a reinforcing bar embedded in the adsorbent.
- an adsorbent having a limit on the amount of adsorption is used, and it is necessary to store the mold and the core so as not to absorb moisture exceeding the amount of adsorption of the adsorbent.
- man-hours are required for the production of the mold and the core, and the cost increases.
- the present invention has been made in view of such problems of the prior art.
- the purpose is to reduce the generation of gas due to the heat of the molten metal without special processing such as piping other than molding on the mold and core, and prevent the occurrence of gas defects and shrinkage nests.
- An object of the present invention is to provide a low-pressure casting method and a low-pressure casting apparatus that facilitate the storage of the core.
- the present inventor has found that in the low pressure casting method, after the core is installed in the mold and the mold is closed, the cavity is decompressed and filled before the molten metal is filled.
- the present inventors have found that the above object can be achieved by drying the child, and have completed the present invention.
- the present invention is based on the above knowledge, and the low-pressure casting method of the present invention is to place a core in a mold, close the mold, dry the core in the mold under reduced pressure, and then fill the cavity with molten metal. It is characterized by.
- the low-pressure casting apparatus of the present invention includes a core that forms a cavity together with a mold, and a decompression device that dries the core under reduced pressure.
- the core is placed in the mold and the mold is closed. After the child is dried under reduced pressure, the cavity is filled with molten metal.
- the inside of the mold is decompressed to remove the moisture in the core and dry, so that generation of gas such as water vapor due to the heat of the molten metal is reduced, and gas defects, shrinkage nests are generated. Is prevented from occurring.
- a core is placed in a mold, the cavity is decompressed to remove moisture contained in the core and dried, the cavity is filled with molten metal, cast, the mold is opened, and a molded product is taken out. It is.
- Drying of the core starts from the surface, and when the moisture content on the surface decreases, moisture moves to the surface from the portion having a high moisture content inside and evaporates on the surface. By repeating these evaporation and movement, the drying proceeds to the inside of the core. Accordingly, the faster the moisture moves from the high moisture content portion to the low moisture content, the faster the drying. That is, the greater the difference in water vapor partial pressure and the higher the core temperature, the faster the drying rate.
- a low pressure casting apparatus communicates a holding furnace containing molten metal and a cavity formed in a mold on the holding furnace with stalk, and pressurizes the holding furnace to form a cavity through the stalk. Filled with molten metal and solidified to obtain a molded product.
- FIG. 1 shows a cross-sectional view of an example of the low-pressure casting apparatus of the present invention.
- the lower end of the stalk 4 is immersed in the molten metal 3 in the holding furnace 2 that is hermetically sealed, and the gate 5 is provided at the upper end.
- a mold 6 that can be divided into upper and lower parts is disposed on the holding furnace 2, and a core 8 positioned by a baseboard 7 is accommodated in the mold 6, and a cavity 9 is formed by the mold 6 and the core 8. Is formed.
- the mold 6 may be entirely covered with a chamber 10. By having the chamber 10, heat radiation is suppressed, and thermal efficiency is improved.
- the holding furnace 2 is provided with a pressurizing device 11, and an inert gas such as carbon dioxide is pumped or exhausted into the holding furnace to adjust the pressure in the holding furnace, and the melt 3 is filled into the cavity through the stalk 4.
- the pressurizing device 11 includes a pressurizing pump 12, a valve 13, a pressure sensor (not shown), and the like.
- the decompression device 14 for drying the core under reduced pressure is formed by a decompression pump 15, a decompression container 16, a valve 17, a suction pipe 18, etc., and a suction port 19 of the suction pipe 18 is provided in the chamber 10 and / or the mold 6. .
- the suction ports 19 are preferably provided at a plurality of locations.
- the core in the mold is dried under reduced pressure by reducing the pressure in the chamber 10 covering the entire mold 6 and reducing the pressure in the mold through the gap between the molds 6 that can be divided vertically.
- 8 may be dried, or, as shown in FIG. 2, the cavity 9 may be directly decompressed to dry the core.
- the core 8 can be sucked and dried under reduced pressure through the porous body 21 provided at the place where the base plate 7 for fixing the core 8 in the mold is installed, These may be combined and dried.
- the mold 6 is closed and the cavity 9 is sucked, whereby the mold becomes a drying container for the core 8 and the core 8 can be efficiently dried.
- the pressure reduction in the mold not only directly reduces the pressure in the cavity 9, but also reduces the pressure in the chamber 10 as shown in FIGS. Even if the mold 6 that can be divided into two does not form a completely airtight state, the air in the chamber 10 can be prevented from leaking into the cavity 9.
- the core may be dried by suctioning from the baseboard portion and reducing the pressure in parallel with or independently of the pressure reduction of the cavity.
- sucking from the baseboard part moisture inside the core can be directly sucked and dried, and heat from the molten metal can be easily transferred to the inside of the core, so that the drying speed of the core 8 can be improved.
- a gas venting path connected to the porous body can be provided inside the core 8 and the baseboard 7. By sucking from the path, moisture evaporates not only from the vicinity of the baseboard 7 but also from the entire inside of the core, and the drying speed of the core 8 can be further improved.
- the decompression device 14 directly connected to the cavity 9 sucks the cavity 9 not only when the core 8 is dried under reduced pressure but also when the molten metal 3 is filled in the casting process 9. Is preferred.
- the cavity 9 When filling the molten metal 3, by sucking the cavity 9, it is possible to suck the gas generated by the thermal decomposition of the organic binder or the like forming the core 8, not only preventing gas defects, The hot water behavior is stable and high quality molded products can be obtained.
- the pressure of the cavity 9 when the core 8 is dried under reduced pressure before filling the cavity 9 with the molten metal 3 depends on the size of the core 8, the temperature of the molten metal 3, the airtightness of the mold, etc.
- the pressure is preferably about 0.75 atm, and more preferably 0.9 to 0.75 atm. If the pressure is less than 0.75 atm, the molten metal in the stalk rises excessively, and adverse effects such as a decrease in the molten metal temperature of the hot metal may occur at the start of casting.
- the mold 6 is opened in a state where a predetermined amount of the molten metal 3 is stored in the holding furnace 2, and the core 8 is installed in the mold together with the baseboard 7 for determining the position of the core in the mold. close.
- a powder release agent 22 may be applied to the inner wall of the mold 6 prior to the installation of the core 8 as necessary.
- the powder release agent 22 can be applied by a conventionally known coating method such as spray coating.
- the decompression device 14 directly connected to the cavity 9 preferably has a powder separation device 20 such as a cyclone.
- a powder separation device 20 such as a cyclone.
- a core using an inorganic binder in addition to an organic binder using a resin, a core using an inorganic binder can be used.
- a core using an inorganic binder has a low adhesive strength and low strength while generating less gas during casting, but according to the present invention, the core can be sufficiently dried. The strength of the core using the binder is improved, and the defects due to the broken core are reduced.
- Examples of the inorganic binder include magnesium sulfate (MgSO 4 ), sodium carbonate (Na 2 CO 3 ), sodium borate (Na 2 B 4 O 7 ), sodium sulfate (Na 2 SO 4 ), and the like.
- MgSO 4 magnesium sulfate
- Na 2 CO 3 sodium carbonate
- Na 2 B 4 O 7 sodium borate
- Na 2 SO 4 sodium sulfate
- an inert gas is pumped into the holding furnace 2 by the pressurizing apparatus 10 to pressurize the molten metal surface, and the molten metal 3 is filled into the cavity 9 through the stalk 4.
- the mold 6 is opened and the molded product is taken out.
- the gas generated by the heat of the molten metal 3 is reduced, so that the behavior of the hot water is stable and the occurrence of gas defects and shrinkage cavities is prevented. Is done.
- the cavity 9 it is preferable to fill the cavity 9 with the molten metal 3 while sucking the cavity 9.
- the binder of the core 8 may evaporate due to the heat of the molten metal 3 and generate gas.
- A is a step in which the mold 6 is sealed, the inside of the cavity is decompressed, and the core 8 is dried.
- B is a step of raising the molten metal 3 in the stalk 4 by the first pressurization in the holding furnace 2.
- C is a step in which the molten metal 3 reaches the gate 5 and is switched to the second pressurization in which the filling speed is controlled, and the suction in the mold 6 is started again.
- D is a step of solidifying the molten metal in the mold 6.
- FIG. 8B is an example in which the pressure in the cavity is maintained while the molten metal 3 in the stalk 4 is being raised by the first pressurization in the holding furnace 2.
- FIG. 9 (a) shows the pressurization of the holding furnace 2, the pressure of the cavity, and the pressure of the core 8 when the suction pipe 11 is connected to the base 7 for fixing the core 8 shown in FIG. It is a figure which shows the timing of. Since the pressurization of the holding furnace 2 and the pressure reduction of the cavity are the same as those in FIG. 8, the timing for sucking the core 8 will be described.
- A is a process in which the mold 6 is sealed and the core 8 is sucked and dried. The drying of the core 8 may be continued while the molten metal is rising in the stalk 4 by the first pressurization in the B holding furnace 2, as shown in FIG. When 3 reaches the gate 5 and starts to flow into the cavity, it stops. If the suction of the core 8 is continued even when the molten metal 3 flows in, the molten metal 3 may enter the core 8 and the sand may be caught.
- the low pressure casting apparatus having one molten metal holding furnace has been described as an example.
- the low pressure casting apparatus of the present invention is not limited to this, and the molten metal holding furnace includes two chambers, a molten metal holding chamber and a pressure chamber.
- an electromagnetic pump may be used instead of the pressurizing pump filled with the molten metal 3.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
特に、水分は成形品を水素脆化させる水素ガスの発生源でもあり、成形品の品質向上には、溶湯の熱によって気化する水分等を除去することが重要である。
すなわち、鋳型を形成する鋳砂をゼオライト又はALC等の吸着材で囲い、上記吸着材によって鋳砂の内部まで水分を吸着除去することが開示されている。また、中子を用いる場合は、鋳砂で成形された砂型と、砂型の内部に埋設された吸着材と、吸着材の内部に埋設された鉄筋とで中子を形成する旨が記載されている。
すなわち、鋳型自体や中子自体の内部を均一に減圧することが困難であり、鋳型等の内部圧力にバラツキが生じ易い。また、鋳型等から生じるガスは、有機バインダに由来するガスだけでなく、鋳型等に含まれる水分もガスの発生源であり、上記水分量は、鋳型等が保管される環境等によって変化するため、注湯で生じるガスの量を予め知ることも困難である。
本発明は、鋳型内に中子を設置し、キャビティを減圧して中子に含まれる水分等を除去乾燥した後、キャビティに溶湯を充填して鋳造し、鋳型を開けて成形品を取り出すものである。
したがって、含水率の高い部分から低い部分へ水分が移動する速度が速いほど、乾燥が速く進む。すなわち、水蒸気分圧の差が大きいほど、また、中子の温度が高いほど、乾燥速度が速くなる。
そして、キャビティを減圧することで、中子内部の圧力と中子外部との圧力差が大きくなって、中子内部の水分が速やかに表面に移動するため、中子の内部まで速やかに乾燥させることができる。
したがって、予め、中子に含まれる水分量を調節する必要がなく中子の保管が容易になり、加えて、中子の乾燥工程により鋳造時間(サイクルタイム)が長くなることがない。
保持炉2の上には、上下に分割可能な鋳型6が配置され、該鋳型6の中には巾木7によって位置決めされた中子8が収められ、鋳型6と中子8とでキャビティ9が形成される。上記鋳型6はチャンバ10で全体が覆われていてもよい。チャンバ10を有することで放熱が抑えられ、熱効率が向上する。
さらに、図3に示すように、鋳型内に中子8を固定する巾木7が設置される箇所に設けられた多孔質体21を介して中子8を吸引し減圧乾燥することもでき、これらを合わせて乾燥させてもよい。
鋳型内の減圧は、キャビティ9を直接減圧するだけでなく、図2,3に示すように、チャンバ10内をも減圧することで、チャンバ10内とキャビティ9との圧力差が小さくなり、上下に分割可能な鋳型6が完全な気密状態を形成していなくても、チャンバ10内の空気がキャビティ9に漏れることを防止できる。
なお、多孔質体20を介して中子8を吸引し減圧乾燥する場合は、上記中子8及び巾木7の内部に多孔質体に接続するガス抜き経路を設けることもできる。該経路から吸引することで、巾木7付近からだけでなく、中子内部全体から水分が蒸発し、中子8の乾燥速度をさらに向上させることができる。
まず、保持炉2内に所定量の溶湯3を貯留した状態で鋳型6を開けて、鋳型内での中子の位置を決める巾木7と共に中子8を鋳型内に設置し、鋳型6を閉じる。
本発明においては、予め、中子8の水分が除去されているため、溶湯3の熱によって生じるガスが低減されているため、湯廻りの挙動が安定し、ガス欠陥、引け巣の発生が防止される。
Aは、鋳型6が密閉され、中子8を吸引し乾燥する工程である。中子8の乾燥は、図9(b)に示すように、Bの保持炉2内の一段目の加圧により溶湯がストーク4内を上昇している間は継続してもよいが、溶湯3が湯口5に達し、キャビティ内への流入が開始されたら停止する。溶湯3が流入しても中子8の吸引を継続すると、中子8内に溶湯3が入りこみ、砂噛み込みが生じることがある。
2 保持炉
3 溶湯
4 ストーク
5 湯口
6 鋳型
7 巾木
8 中子
9 キャビティ
10 チャンバ
11 加圧装置
12 加圧ポンプ
13 バルブ
14 減圧装置
15 減圧ポンプ
16 減圧容器
17 バルブ
18 吸引管
19 吸引口
20 紛体分離装置
21 多孔質体
22 紛体離型剤
23 紛体分離装置
24 熱気
Claims (9)
- 鋳型内に中子を設置する中子設置工程と、
鋳型を閉じる型閉じ工程と、
該鋳型内のキャビティに溶湯を充填し凝固させる鋳造工程と、
該鋳造工程で成形された成形品を取り出す型開け工程と、を有する低圧鋳造方法であって、
さらに、上記型閉じ工程後、鋳造工程前に、中子を減圧乾燥する減圧乾燥工程を有することを特徴とする低圧鋳造方法。 - 上記型閉じ工程前に、鋳型に離型剤を塗布する離型剤塗布工程を有することを特徴とする請求項1に記載の低圧鋳造方法。
- 上記鋳造工程が、キャビティに溶湯を充填しながらキャビティを吸引するものであることを特徴とする請求項1又は2に記載の低圧鋳造方法。
- 鋳型と、
該鋳型と共にキャビティを形成する中子と、
溶湯を保持する保持炉と、
該保持炉内の溶湯に下端が浸漬され上記鋳型に溶湯を充填するストークと、
上記保持炉内を加圧し、ストークを介して溶湯をキャビティに充填する加圧装置と、を有する低圧鋳造装置であって、
上記キャビティを減圧する減圧装置をさらに有し、
上記鋳型を閉じた後、キャビティに溶湯を充填する前に、上記中子を減圧乾燥することを特徴とする低圧鋳造装置。 - 上記鋳型が、吸引口を複数有することを特徴とする請求項4に記載の低圧鋳造装置。
- 上記複数の吸引口のうち、一つの吸引口がキャビティに設けられ、他の吸引口が中子を固定する巾木が設置される箇所の多孔質体に設けられていることを特徴とする請求項5に記載の低圧鋳造装置。
- 上記鋳型が、離型剤を塗布されたものであることを特徴とする請求項4乃至6のいずれか1つの項に記載の低圧鋳造装置。
- キャビティに溶湯を充填しながらキャビティを吸引することを特徴とする請求項4乃至7のいずれか1つの項に記載の低圧鋳造装置。
- 上記中子が無機バインダで成形されたものであることを特徴とする請求項4乃至8のいずれか1つの項に記載の低圧鋳造装置。
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