JPH06122060A - Reduced pressure casting method - Google Patents
Reduced pressure casting methodInfo
- Publication number
- JPH06122060A JPH06122060A JP4275920A JP27592092A JPH06122060A JP H06122060 A JPH06122060 A JP H06122060A JP 4275920 A JP4275920 A JP 4275920A JP 27592092 A JP27592092 A JP 27592092A JP H06122060 A JPH06122060 A JP H06122060A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- gas
- casting
- pressure
- molten steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005266 casting Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 238000009423 ventilation Methods 0.000 claims abstract description 4
- 239000011230 binding agent Substances 0.000 claims description 21
- 230000007547 defect Effects 0.000 abstract description 22
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 6
- 239000000853 adhesive Substances 0.000 abstract 2
- 230000001070 adhesive effect Effects 0.000 abstract 2
- 238000007789 sealing Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 67
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 12
- 230000003068 static effect Effects 0.000 description 7
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005979 thermal decomposition reaction Methods 0.000 description 4
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- JIRHAGAOHOYLNO-UHFFFAOYSA-N (3-cyclopentyloxy-4-methoxyphenyl)methanol Chemical compound COC1=CC=C(CO)C=C1OC1CCCC1 JIRHAGAOHOYLNO-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は有機粘結剤を使用した鋳
型（砂型）中に溶鋼を注湯する鋳物の製作方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a casting in which molten steel is poured into a mold (sand mold) using an organic binder.
【０００２】[0002]
【従来の技術】大型鋳鋼用鋳型の粘結剤としては、代表
的なものとして、無機バインダ…水ガス，有機バインダ
…フラン樹脂，フェノール樹脂，等が使用されている。
水ガラスを粘結剤とした鋳型は、鋳造後の鋳型強度が大
きく、鋳型の崩壊性が悪い。このため型ばらしに多大の
時間がかかる。2. Description of the Related Art Inorganic binders such as water gas, organic binders such as furan resin and phenol resin are typically used as a binder for a large casting steel mold.
A mold using water glass as a binder has high mold strength after casting and the mold disintegration is poor. Therefore, it takes a lot of time to remove the mold.
【０００３】一方、フランあるいはフェノール樹脂等の
有機化合物を粘結剤とした鋳型は、注湯後に鋳型が鋳物
によって加熱されると、約４００℃以上で粘結剤が分解
・気化する。従って、鋳型の崩壊性は非常に良好である
が、鋳物砂１グラム当り１０ｃｃ以上のガスを発生し、
この鋳型から発生するガスが溶鋼（鋳物）中に侵入し
て、鋳物が凝固後にガス欠陥として残留する。On the other hand, in a mold using an organic compound such as furan or a phenol resin as a binder, when the mold is heated by the casting after pouring, the binder is decomposed and vaporized at about 400 ° C. or higher. Therefore, the mold disintegration property is very good, but 10 cc or more of gas is generated per gram of molding sand,
The gas generated from this mold penetrates into the molten steel (casting), and the casting remains as gas defects after solidification.
【０００４】また、従来は大気圧下で注湯，凝固してい
るのが一般的であり、発生ガスによって鋳型内部は必ず
大気圧以上の圧力になっている。鋳型内の圧力が溶鋼静
圧以上になると、鋳型の砂粒子間のガスが圧力差により
溶鋼中に侵入して鋳物内部を上昇する間に捕捉され、数
ｍｍ以上の比較的大きなガス欠陥として現われている。
一方、鋳型内部の圧力が溶鋼静圧以下である場合でも、
鋳物（溶鋼）と鋳型内のガス成分の濃度差により、ガス
成分が溶鋼中に一旦溶解し、凝固過程でガス成分の溶解
度が低下することにより、過飽和分が気泡となって欠陥
を発生している。Further, conventionally, it is general that the molten metal is poured and solidified under the atmospheric pressure, and the inside of the mold is always kept at the atmospheric pressure or higher due to the generated gas. When the pressure in the mold exceeds the static pressure of molten steel, the gas between sand particles in the mold penetrates into the molten steel due to the pressure difference and is trapped while rising inside the casting, and appears as a relatively large gas defect of several mm or more. ing.
On the other hand, even if the pressure inside the mold is less than the static pressure of molten steel,
Due to the difference in the concentration of the gas components in the casting (molten steel) and the mold, the gas components are once dissolved in the molten steel, and the solubility of the gas components decreases during the solidification process, causing supersaturated bubbles to form defects. There is.
【０００５】有機粘結剤を使用する限り、粘結剤の熱分
解によるガス発生は避けられず、ガス欠陥防止の対策と
して、造型過程でガス抜きを設置しているが、大型で複
雑形状の鋳鋼では場所によってガス抜きが不充分にな
り、また薄肉の中子等ではガス抜きの設置が不可能な場
合があり、しばしばガス欠陥が発生し、その補修に多大
の人手と時間を要しているのが現状である。As long as an organic binder is used, gas generation due to thermal decomposition of the binder is unavoidable. As a measure for preventing gas defects, a gas vent is installed in the molding process, but it is large and complicated. Degassing is insufficient in some places in cast steel, and it may not be possible to install degassing in thin-walled cores, etc. Gas defects often occur, and repairing them requires a lot of manpower and time. It is the current situation.
【０００６】[0006]
【発明が解決しようとする課題】前述したように、フラ
ンあるいはフェノール樹脂等の有機化合物を粘結剤とし
た鋳型は、注湯後に粘結剤が熱分解して、多量のガスを
発生し、鋳型の通気度が小さいと、発生したガスにより
鋳型内のガス圧力が増大し、このガスが溶鋼中に侵入し
て、鋳物の内部あるいは鋳物の表層部にガス欠陥が発生
する等の問題点を有する。As described above, the mold using an organic compound such as furan or a phenol resin as a binder, the binder is thermally decomposed after pouring to generate a large amount of gas, If the air permeability of the mold is low, the gas pressure in the mold increases due to the generated gas, and this gas penetrates into the molten steel, causing problems such as gas defects inside the casting or on the surface layer of the casting. Have.
【０００７】有機粘結剤を使用する限り、粘結剤の熱分
解によるガス発生は避けられず、従来もガス抜きを設置
して鋳型内圧力の低下に工夫しているが、経験的にガス
抜きを設置していることもあり、大型で複雑形状の鋳鋼
品ではガス抜き効果が不充分になり、また薄肉の中子等
ではガス抜きの設置が不可能な場合があり、しばしばガ
ス欠陥が発生している。As long as an organic binder is used, gas generation due to thermal decomposition of the binder is unavoidable. Conventionally, a gas vent is installed to reduce the pressure in the mold. Since a vent is installed, the gas venting effect may be insufficient for large and complicated cast steel products, and it may not be possible to install the vent for thin cores, etc. It has occurred.
【０００８】本発明は、有機粘結剤を使用する鋳型にお
いて、鋳造した鋳物（鋳鋼）のガス欠陥を低減あるいは
防止することを目的とするものである。The object of the present invention is to reduce or prevent gas defects in a cast product (cast steel) cast in a mold using an organic binder.
【０００９】[0009]
【課題を解決するための手段】鋳物（鋳鋼）のガス欠陥
は、鋳型内のガス圧力あるいは発生ガス組成によって、
その発生メカニズムが異なるが、以下の２種類に大別さ
れる。 （１） 鋳型内の圧力が溶鋼の静圧より大きくなった場
合 圧力差により鋳型内砂粒間のガスが溶鋼中にガス状で侵
入し、浮力によって溶鋼中を上昇する過程で鋳物内に捕
捉されてそのまま残留する。 （２） 鋳型内の圧力が溶鋼の静圧より小さい場合 鋳型内砂粒子間のガスと溶鋼中のガス成分の濃度差（平
衡する圧力差）によりガス成分が一旦溶鋼に溶解し、凝
固過程でガス成分の溶解度が低下することにより、過飽
和分が気泡となってガス欠陥を生成する。Gas defects in a casting (cast steel) are caused by the gas pressure in the mold or the composition of the generated gas.
Although the generation mechanism is different, it is roughly classified into the following two types. (1) When the pressure in the mold is higher than the static pressure of the molten steel The gas between the sand grains in the mold enters the molten steel in a gaseous state due to the pressure difference, and is trapped in the casting during the process of rising in the molten steel due to buoyancy. Remains as is. (2) When the pressure in the mold is less than the static pressure of the molten steel The gas component once dissolves in the molten steel due to the concentration difference (equilibrium pressure difference) between the gas between the sand particles in the mold and the gas component in the molten steel. Due to the decrease in the solubility of the gas component, the supersaturated component becomes bubbles to generate gas defects.
【００１０】鋳型内で発生したガスの圧力が溶鋼の静圧
より大きい場合、あるいは小さい場合でも、鋳型内のガ
ス圧力が大きいほどガス欠陥が発生し易い。従って、発
生したガスを鋳型の外面から排気して、鋳型内の圧力を
低く保ちながら注湯及び凝固させることにより、鋳型か
ら溶鋼中へのガスの侵入を防止あるいは減少して、ガス
欠陥の発生を防止する。Even if the pressure of the gas generated in the mold is higher or lower than the static pressure of the molten steel, the gas defect is more likely to occur as the gas pressure in the mold is higher. Therefore, the generated gas is exhausted from the outer surface of the mold, and by pouring and solidifying while keeping the pressure in the mold low, the invasion of gas from the mold into the molten steel is prevented or reduced, and gas defects are generated. Prevent.
【００１１】[0011]
（１） 発生したガスを鋳型の外面から排気して、鋳型
内の圧力を常に溶鋼の静圧以下に保ちながら注湯及び凝
固させることにより、鋳型内のガスが直接溶鋼（鋳物）
中に侵入することが防止される。 （２） 鋳型内のガス圧力が溶鋼静圧以下でも、鋳型内
のガス成分と溶鋼中のガス成分の濃度差（平衡する分圧
差）により、ガス成分が溶鋼中に溶解し、凝固過程でガ
ス成分の溶解度が低下することにより、過飽和分が気泡
となってガス欠陥を発生する場合がある。例えばフラ
ン，フェノール等の有機バインダは、熱分解によりメタ
ンガスを発生するが、次の（化１）に示す反応により水
素が溶鋼中に溶解する。(1) The generated gas is exhausted from the outer surface of the mold and is poured and solidified while keeping the pressure in the mold below the static pressure of the molten steel, so that the gas in the mold is directly molten steel (cast).
It is prevented from entering inside. (2) Even if the gas pressure in the mold is less than or equal to the static pressure of the molten steel, the gas component is dissolved in the molten steel due to the concentration difference (equal equilibrium partial pressure difference) between the gas component in the mold and the gas component in the molten steel. Due to the decrease in the solubility of the components, the supersaturated components may become bubbles to generate gas defects. For example, organic binders such as furan and phenol generate methane gas by thermal decomposition, but hydrogen is dissolved in molten steel by the reaction shown in the following (Chemical formula 1).
【００１２】[0012]
【化１】 [Chemical 1]
【００１３】水蒸気についても同様である。The same applies to water vapor.
【００１４】[0014]
【化２】 [Chemical 2]
【００１５】上記（１），（２）項のいずれの場合で
も、溶鋼中の溶解量はガス分圧に比例している。従って
鋳型内の圧力（全圧）を低くすることにより、有害ガス
成分の分圧が低下し、溶鋼中のガス成分の溶解量が凝固
時の飽和溶解量以下になり、ガス欠陥の発生が防止され
る。In any of the above items (1) and (2), the amount of melt in the molten steel is proportional to the gas partial pressure. Therefore, by lowering the pressure (total pressure) in the mold, the partial pressure of harmful gas components decreases, the dissolved amount of gas components in molten steel becomes less than the saturated dissolved amount during solidification, and gas defects are prevented from occurring. To be done.
【００１６】[0016]
【実施例】本発明による減圧注湯方法を実施するための
鋳型装置の概要を図１に示す。図において、１は取鍋，
２は溶鋼，３は鋳込口，４は押湯，５は鋳型（主型），
６は中子，７は鋳枠，８は通気穴，９はチャンバ，１０
はシール板，１１はバルブ，１２は排気ポンプ，１３は
ガス抜きである。EXAMPLES An outline of a casting mold apparatus for carrying out the reduced pressure pouring method according to the present invention is shown in FIG. In the figure, 1 is a ladle,
2 is molten steel, 3 is pouring port, 4 is riser, 5 is mold (main mold),
6 is a core, 7 is a casting frame, 8 is a ventilation hole, 9 is a chamber, 10
Is a seal plate, 11 is a valve, 12 is an exhaust pump, and 13 is a gas vent.
【００１７】次に本装置を用いた減圧注湯方法の実施例
について説明する。通気穴８を有する鋳枠７に主型５及
び中子６（中子６の概略形状は図２参照）を、フランを
粘結剤とし、キシレンスルホン酸を硬化触媒として造型
した。故意にバインダからのガス発生量を増大させてガ
ス欠陥を明瞭にするために、クロマイト砂１００部に対
してフラン粘結剤を２部，キシレンスルホン酸を０．５
部配合した。鋳型５及び中子６を上部が開放した鋼板製
のチャンバ９内に設置し、更にチャンバ９と鋳型５間の
上部に鋼板製のシール板１０を設置して、約１２０℃の
温風で２４時間乾燥した後に、排気ポンプ１２でチャン
バ９内を排気しながら、取鍋１内の溶鋼２を鋳型５，６
に注湯し、注湯完了後１０分して排気ポンプ１２を停止
して、その後はチャンバ９内を大気圧に戻して凝固を完
了させた。Next, an embodiment of a reduced pressure pouring method using this apparatus will be described. A main mold 5 and a core 6 (see FIG. 2 for a schematic shape of the core 6) were molded in a casting frame 7 having a ventilation hole 8 using furan as a binder and xylene sulfonic acid as a curing catalyst. In order to intentionally increase the amount of gas generated from the binder and clarify the gas defects, 2 parts of furan binder and 0.5 part of xylene sulfonic acid are added to 100 parts of chromite sand.
Parts. The mold 5 and the core 6 are installed in a steel plate chamber 9 having an open top, and a steel plate seal plate 10 is installed in the upper part between the chamber 9 and the mold 5. After drying for an hour, the molten steel 2 in the ladle 1 is cast into the molds 5, 6 while exhausting the chamber 9 with the exhaust pump 12.
Then, 10 minutes after the completion of the pouring, the exhaust pump 12 was stopped, and then the chamber 9 was returned to atmospheric pressure to complete the solidification.
【００１８】上記の減圧注湯方法において、溶鋼２の材
質はＳＯ４６０であり、注湯温度は１６３０℃とした。
また減圧注湯の効果を確認する目的で、全く同一条件に
て造型した鋳型５，６に対して、大気圧下で注湯，凝固
させた鋳物を比較材とした。大気圧下で注湯，凝固させ
た場合の中子６内部の圧力測定結果の一例は図４に示す
とおりであった（鋳型内のガス圧力の測定は内径２ｍｍ
の鋼管を介して圧力計にて測定した。圧力測定位置は図
２に示したとおりであり、鋳物との界面から２ｍｍ内側
の中子６内で測定した）。In the above reduced pressure pouring method, the material of the molten steel 2 was SO460 and the pouring temperature was 1630 ° C.
For the purpose of confirming the effect of reduced pressure pouring, castings poured and solidified under atmospheric pressure were used as comparative materials for molds 5 and 6 molded under exactly the same conditions. An example of the pressure measurement result inside the core 6 when pouring and solidifying under the atmospheric pressure is shown in Fig. 4 (the gas pressure in the mold is measured as 2 mm inside diameter).
It measured with the pressure gauge through the steel pipe of. The pressure measurement position is as shown in FIG. 2, and was measured inside the core 6 2 mm inside from the interface with the casting).
【００１９】これに対して減圧しながら注湯，凝固させ
た場合の同一位置でのガス圧力の測定結果例は図５の
（Ａ）に示す通りであり、注湯前は約−１０００ｍｍＨ
2 Ｏ（約−７０ｍｍＨｇ）であるが、溶湯が充満するこ
とによって、湯口部及び押湯部からの空気の吸引が減少
し、最終的には約−３０００ｍｍＨ2 Ｏ（約−２２０ｍ
ｍＨｇ）に到達し、鋳型５，６内は常に負圧を保持する
ことができた。On the other hand, an example of the measurement result of the gas pressure at the same position when pouring and solidifying while depressurizing is shown in FIG. 5 (A), which is about -1000 mmH before pouring.
Although it is 2 O (about -70 mmHg), the suction of air from the sprue part and the riser part is reduced by the filling of the molten metal, and finally about -3000 mmH 2 O (about -220 m).
mHg) was reached, and negative pressure could be constantly maintained in the molds 5 and 6.
【００２０】大気圧下で注湯，凝固させた場合には、図
６の鋳物断面写真に示すように、中子の上方に位置する
鋳物内部に多量のガス欠陥が存在している。一方、本発
明により鋳型内を減圧しながら溶鋼を注湯，凝固させた
場合には、図７の鋳物断面写真に示すように、ガス欠陥
は存在していない。次に他の鋳型装置を用いた本発明の
実施例を図３について説明する。図３に示すように、中
子６ａの内部にガス抜き１３を設置し、ガス抜き１３の
一端を鋳型５とチャンバ９間の空間部に導入し、ガス抜
き１３の設置以外は図１と同じ構造とする。本装置を用
い図１の鋳型装置と同一条件で造型，乾燥し、同一能力
の排気ポンプ１２で排気しながら、同一条件の溶鋼２を
注湯し、凝固させた。この場合の鋳型５，６ａ内圧力の
測定結果例は、図５の（Ｂ）に示すようになり、中子６
ａ内は、ガス抜きがない場合より、更に低い圧力に維持
することができ、ガス欠陥のない健全な鋳物を製造する
ことができた。When the molten metal is poured and solidified under atmospheric pressure, a large amount of gas defects are present inside the casting located above the core as shown in the photograph of the casting cross section in FIG. On the other hand, when molten steel is poured and solidified while depressurizing the inside of the mold according to the present invention, there are no gas defects as shown in the photograph of the casting cross section in FIG. Next, an embodiment of the present invention using another mold apparatus will be described with reference to FIG. As shown in FIG. 3, a gas vent 13 is installed inside the core 6 a, one end of the gas vent 13 is introduced into the space between the mold 5 and the chamber 9, and the same as FIG. 1 except that the gas vent 13 is installed. The structure. Using this apparatus, molding and drying were performed under the same conditions as in the casting apparatus of FIG. 1, and molten steel 2 under the same conditions was poured and solidified while exhausting with an exhaust pump 12 of the same capacity. An example of the measurement result of the pressure inside the molds 5 and 6a in this case is as shown in FIG.
The inside of a could be maintained at a lower pressure than when there was no gas venting, and a sound casting without gas defects could be produced.
【００２１】なお、図３において図１と同一の符号は同
一の部材を示している。In FIG. 3, the same reference numerals as those in FIG. 1 denote the same members.
【００２２】[0022]
【発明の効果】本発明による減圧鋳造方法は、有機粘結
剤を用いた鋳型による鋳造方法において、通気穴を有す
る鋳枠に造型した鋳型を、上部が開放された鋼板製のチ
ャンバ内にセットし、鋳枠とチャンバの上部間をシール
板で閉鎖した後でチャンバ内を減圧し、減圧状態を維持
しながら溶鋼を鋳型に注湯し、凝固させることにより、
次の効果を有する。According to the vacuum casting method of the present invention, in the casting method using the organic binder, the casting mold having a vent is set in a chamber made of a steel plate having an open top. Then, after closing the space between the flask and the upper part of the chamber with a seal plate, the pressure inside the chamber is reduced, and molten steel is poured into the mold while maintaining the reduced pressure, and solidified,
It has the following effects.
【００２３】熱分解によって多量のガスを発生するフラ
ン，フェノール等の有機粘結剤を使用した鋳型を用いた
場合に、ガス欠陥の発生を防止、あるいは減少すること
ができ、鋳造欠陥の補修に要する時間が大幅に減少す
る。また欠陥が存在しない（あるいは少ない）ために、
機械的性質が良好で、信頼性に優れた鋳鋼の製造が可能
である。When a mold using an organic binder such as furan or phenol which generates a large amount of gas by thermal decomposition is used, it is possible to prevent or reduce the generation of gas defects, and to repair casting defects. The time required is greatly reduced. Also, because there are no (or few) defects,
It is possible to manufacture cast steel with good mechanical properties and excellent reliability.
【図１】本発明を実施するための鋳型装置の１例を示す
構成図である。FIG. 1 is a configuration diagram showing an example of a casting mold apparatus for carrying out the present invention.
【図２】図１に示した中子の具体的寸法及び圧力測定位
置を示す図である。FIG. 2 is a diagram showing specific dimensions and pressure measurement positions of the core shown in FIG.
【図３】本発明を実施するための鋳型装置の他の例を示
す構成図である。FIG. 3 is a configuration diagram showing another example of the casting mold apparatus for carrying out the present invention.
【図４】従来の大気圧下注湯，凝固時の中子内のガス圧
力の経時変化を示す線図である。FIG. 4 is a diagram showing changes over time in gas pressure in a core during conventional pouring under atmospheric pressure and solidification.
【図５】本発明による減圧鋳造時の中子内のガス圧力の
経時変化を示す線図である。FIG. 5 is a diagram showing a change with time in gas pressure in a core during vacuum casting according to the present invention.
【図６】従来の大気圧下注湯，凝固時の鋳物内部にガス
欠陥を発生した金属組織を示す写真である。FIG. 6 is a photograph showing a metallographic structure in which a gas defect is generated in a casting during conventional molten metal pouring under atmospheric pressure and solidification.
【図７】本発明による減圧鋳造時の鋳物断面の金属組織
を示す写真である。FIG. 7 is a photograph showing the metallographic structure of the cross section of the casting during vacuum casting according to the present invention.
１ 取鍋 ２ 溶鋼 ３ 鋳込口 ４ 押湯 ５ 鋳型（主型） ６ 中子 ７ 鋳枠 ８ 通気穴 ９ チャンバ １０ シール板 １１ バルブ １２ 排気ポンプ 1 Ladle 2 Molten Steel 3 Casting Port 4 Riser 5 Mold (Main Mold) 6 Core 7 Forming Frame 8 Vent Hole 9 Chamber 10 Seal Plate 11 Valve 12 Exhaust Pump
───────────────────────────────────────────────────── フロントページの続き (72)発明者 馬躰 重満 兵庫県神戸市兵庫区和田崎町一丁目１番１ 号 三菱重工業株式会社神戸造船所内 (72)発明者 田中 俊彰 兵庫県神戸市兵庫区和田崎町一丁目１番１ 号 三菱重工業株式会社神戸造船所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigemitsu Maman, 1-1 1-1 Wadazaki-cho, Hyogo-ku, Kobe, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Toshiaki Tanaka, Hyogo-ku, Kobe, Hyogo Prefecture 1-1-1 Wadazakicho Mitsubishi Heavy Industries Ltd. Kobe Shipyard
Claims (1)
において、通気穴を有する鋳枠に造型した鋳型を、上部
が開放された鋼板製のチャンバ内にセットし、鋳枠とチ
ャンバの上部間をシール板で閉鎖した後でチャンバ内を
減圧し、減圧状態を維持しながら溶鋼を鋳型に注湯し、
凝固させることを特徴とした減圧鋳造方法。1. A casting method using a mold using an organic binder, wherein a mold formed in a flask having ventilation holes is set in a steel plate chamber having an open top, and the flask and the top of the chamber are set. After closing the space with a seal plate, the pressure inside the chamber is reduced, and molten steel is poured into the mold while maintaining the reduced pressure.
A reduced pressure casting method characterized by solidifying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4275920A JPH06122060A (en) | 1992-10-14 | 1992-10-14 | Reduced pressure casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4275920A JPH06122060A (en) | 1992-10-14 | 1992-10-14 | Reduced pressure casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06122060A true JPH06122060A (en) | 1994-05-06 |
Family
ID=17562270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4275920A Withdrawn JPH06122060A (en) | 1992-10-14 | 1992-10-14 | Reduced pressure casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06122060A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007032174A1 (en) | 2005-09-15 | 2007-03-22 | Masahito Goka | Casting method |
| JP2010105023A (en) * | 2008-10-30 | 2010-05-13 | Daido Castings:Kk | Vacuum suction casting method |
| JP2018024013A (en) * | 2016-08-11 | 2018-02-15 | 財團法人金屬工業研究發展中心Ｍｅｔａｌ Ｉｎｄｕｓｔｒｉｅｓ Ｒｅｓｅａｒｃｈ ＆ Ｄｅｖｅｌｏｐｍｅｎｔ Ｃｅｎｔｒｅ | Casting product cooling device |
-
1992
- 1992-10-14 JP JP4275920A patent/JPH06122060A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007032174A1 (en) | 2005-09-15 | 2007-03-22 | Masahito Goka | Casting method |
| JP2010105023A (en) * | 2008-10-30 | 2010-05-13 | Daido Castings:Kk | Vacuum suction casting method |
| JP2018024013A (en) * | 2016-08-11 | 2018-02-15 | 財團法人金屬工業研究發展中心Ｍｅｔａｌ Ｉｎｄｕｓｔｒｉｅｓ Ｒｅｓｅａｒｃｈ ＆ Ｄｅｖｅｌｏｐｍｅｎｔ Ｃｅｎｔｒｅ | Casting product cooling device |
| CN107716904A (en) * | 2016-08-11 | 2018-02-23 | 财团法人金属工业研究发展中心 | Casting cooling device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5058653A (en) | Process for lost foam casting of metal parts | |
| EP2785480B1 (en) | Method for molding sand mold and sand mold | |
| CA2403952C (en) | Method for the uphill casting of cast pieces in sand dies with controlled solidification | |
| RU2567932C2 (en) | Sand blends containing organic acid salts and their application | |
| CN116422867B (en) | Systems and methods for increasing the cooling rate of metal sand castings during solidification. | |
| CN108057840A (en) | A kind of formula of the water base lost foam paint of low-temperature high-strength magnesium iron | |
| US5161595A (en) | Process for the lost foam casting, under low pressure, of aluminium alloy articles | |
| CN104907497A (en) | External multiple-core casting method for oblique column casting | |
| CN1223420C (en) | Sand mould negative pressure gravity casting method | |
| JPH06122060A (en) | Reduced pressure casting method | |
| JPH0833944A (en) | Method for pouring molten metal in partial reduced pressure into casting | |
| JPH08206777A (en) | Vanishing model casting method | |
| JPS6277148A (en) | Method and apparatus for full mold casting by quick solidification | |
| EP0356659B1 (en) | Countergravity casting apparatus and process for casting thinwalled parts | |
| JPH05277699A (en) | Method for casting thin casting | |
| CN113458330A (en) | Large-scale guide pump casing casting system | |
| JPH09314309A (en) | Vacuum suction casting method | |
| JP5196402B2 (en) | Vacuum suction casting method | |
| JPH0890152A (en) | Production of high strength aluminum alloy casting | |
| CN1739891A (en) | Vacuum suction casting preparation method of aluminum matrix composite material | |
| JPS63235044A (en) | Precision casting mold | |
| JP2541691B2 (en) | Core for forming the socket of cast iron pipe | |
| JP2003205343A (en) | Coating mold for vanishing model casting | |
| JP3272576B2 (en) | Mold drying method | |
| JPS58100960A (en) | Argon substituting method for mold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000104 |