JPH0818122B2 - Vacuum shell mold casting method - Google Patents
Vacuum shell mold casting methodInfo
- Publication number
- JPH0818122B2 JPH0818122B2 JP5015138A JP1513893A JPH0818122B2 JP H0818122 B2 JPH0818122 B2 JP H0818122B2 JP 5015138 A JP5015138 A JP 5015138A JP 1513893 A JP1513893 A JP 1513893A JP H0818122 B2 JPH0818122 B2 JP H0818122B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- casting
- self
- casting method
- hardening
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、シェルモールド鋳造法
と減圧フルモールド鋳造法の長所を組合せた精密鋳造、
高品質大量生産鋳造に適した減圧シェルモールド鋳造法
に関するものである。BACKGROUND OF THE INVENTION The present invention relates to precision casting which combines the advantages of shell mold casting and vacuum full mold casting.
The present invention relates to a reduced pressure shell mold casting method suitable for high quality mass production casting.
【０００２】[0002]
【従来の技術】シェルモールド鋳造法と減圧フルモール
ド鋳造法は、精密鋳造法として従来から知られている。
シェルモールド鋳造法は、周知のように模型の表面にシ
ェルモールド・フラン樹脂又はCO2 砂を塗布して硬化さ
せることによりシェル状の自硬性鋳型を作成し、これを
用いて鋳造する方法である。この方法は多くの鋳造法の
中でも特に寸法精度鋳肌において優れた良品が得られる
こと、スタック法を用いて量産鋳造も可能であること、
鋳型強度もあり複雑形状の鋳造品にも適していること、
このためクランクシャフト等の量産鋳造に採用されてい
ること等の多くの利点をもつ。2. Description of the Related Art A shell mold casting method and a reduced pressure full mold casting method are conventionally known as precision casting methods.
As is well known, the shell mold casting method is a method in which a shell-shaped self-hardening mold is created by applying shell mold furan resin or CO 2 sand to the surface of a model and curing it, and casting is performed using this. . This method can obtain a good product excellent in dimensional precision casting surface among many casting methods, and mass production casting using the stack method is also possible,
It has mold strength and is suitable for casting products with complicated shapes.
Therefore, it has many advantages such as being used for mass production casting of crankshafts and the like.
【０００３】ところが、シェルモールド鋳造法は溶湯の
凝固過程において生ずる外部引け巣や気泡等を防止する
ために大きな押湯溜、揚がり等を設ける必要があり、多
大なむだ湯が生じること、また鋳造後の後処理工程が煩
雑であること等のために生産性の点でマイナスとなって
いるのが現状である。However, in the shell mold casting method, it is necessary to provide a large feeder pool, frying and the like in order to prevent external shrinkage cavities and bubbles generated during the solidification process of the molten metal. The current situation is that productivity is negative due to complicated post-treatment processes.
【０００４】一方、減圧フルモールド鋳造法は発泡ポリ
スチレン、発泡ポリウレタン等の発泡性樹脂からなる消
失性模型を減圧可能な枠内の乾燥砂やショットボール中
に埋設し、枠内を減圧したまま溶湯を注湯して消失性模
型と溶湯とを置換する方法である。この方法は上記した
ような欠点はないが、消失性模型の全体を消失させるた
めにススや発泡性樹脂の未消失残渣が鋳造品内に混入
し、品質不良を引き起こす原因となることがある。また
この方法は消失性模型の強度が低いために大型品となる
と変形・歪を生ずるおそれがある。On the other hand, in the reduced pressure full mold casting method, an extinguishing model made of a foaming resin such as expanded polystyrene or polyurethane is buried in dry sand or shot balls in a depressurizable frame, and the molten metal is depressurized in the frame. It is a method of pouring molten metal to replace the extinction model and the molten metal. Although this method does not have the above-mentioned drawbacks, soot and undisappeared residues of the foaming resin may be mixed into the cast product to cause the disappearance of the entire extinction model, which may cause quality defects. Further, in this method, since the extinguishing model has low strength, it may be deformed or distorted in a large size product.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、多くのむだ湯を生ずることなく外部
引け巣や気泡等を防止することができ、また鋳造後の後
処理工程を削減することができ、更に未消失残渣による
品質不良や変形・歪を防止することができる生産性に優
れた鋳造法を提供するために完成されたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and can prevent external shrinkage cavities and bubbles without generating a large amount of waste water, and a post-treatment step after casting. The present invention has been completed to provide a casting method with excellent productivity that can reduce the number of defects and prevent quality defects and deformation / distortion due to undisappeared residues.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の減圧シェルモールド鋳造法は、減
圧可能な枠内に、シェルモールド・フラン樹脂又はCO2
砂からなる自硬性鋳型を埋設するとともに、発泡性樹脂
からなる消失性湯口管の先端を自硬性鋳型の下部のスト
レーナホールに密着させることによってこの自硬性鋳型
の型内空間と非消失性湯口管とを接続し、枠内を減圧し
ながら溶湯を注湯して消失性湯口管を消失させながらス
トレーナホールを介して型内空間への鋳込みを行うこと
を特徴とするものである。The pressure-reducing shell mold casting method of the present invention, which has been made to solve the above-mentioned problems, uses a shell mold furan resin or CO 2 in a frame capable of reducing pressure.
While embedding a self-hardening mold made of sand, attach the tip of the fusible spout made of foaming resin to the bottom of the self-hardening mold.
The self-hardening mold is connected to the mold interior space and the non-disappearing sprue pipe by closely adhering to the lenghre hole, and the molten metal is poured while decompressing the inside of the frame to make the disappearing spout pipe disappear.
It is characterized in that casting is performed into the space inside the mold through the trainer hole .
【０００７】[0007]
【実施例】以下に本発明を実施例とともに更に詳細に説
明する。実施例はルーツ型真空ポンプのロータを本発明
の減圧シェルモールド鋳造法により鋳造する例を示すも
のである。まず図１に示すように、シェルモールド・フ
ラン樹脂又はCO2 砂によって自硬性鋳型１を作成する。
図中、1aは中心軸となる部分、1bはルーツ型の羽根部
分、1cは羽根中空部分であり、ハッチングを施した部分
が鋳型である。EXAMPLES The present invention will be described in more detail below with reference to examples. The embodiment shows an example of casting a rotor of a roots type vacuum pump by the reduced pressure shell mold casting method of the present invention. First, as shown in FIG. 1, a self-hardening mold 1 is prepared from shell mold furan resin or CO 2 sand.
In the figure, 1a is a central axis portion, 1b is a roots type blade portion, 1c is a blade hollow portion, and a hatched portion is a mold.
【０００８】次にこの自硬性鋳型１を図２に示すよう
に、減圧可能な枠３内の乾燥砂４やショットボールの内
部に埋設する。５は発泡ポリスチレン、発泡ポリウレタ
ン等の発泡性樹脂からなる消失性湯口管であり、その表
面には塗型剤層２が形成されている。この消失性湯口管
５の先端は自硬性鋳型１の下部に形成されたストレーナ
ホール６に密着されており、またその他端は陶管製湯口
管のような非消失性湯口管７に接続されている。11は非
消失性湯口管７の上端にセットされた湯口カップ、12は
自硬性鋳型１の上端にセットされた押湯カップである。
なお、枠３内には減圧用金網パイプ８が設けられている
とともに、乾燥砂４の表面には減圧シール用のフィルム
９がフィルム保護用蓋10に押さえられてセットされてお
り、枠３内の減圧が確実に行われるようになっている。Next, as shown in FIG. 2, the self-hardening mold 1 is embedded in the dry sand 4 and the shot ball in the frame 3 capable of depressurizing. Reference numeral 5 denotes a disappearing sprue pipe made of a foaming resin such as expanded polystyrene or expanded polyurethane, and a mold coating agent layer 2 is formed on the surface thereof. The tip of the disappearing spout pipe 5 is in close contact with a strainer hole 6 formed in the lower part of the self-hardening mold 1, and the other end is connected to a non-disappearing spout pipe 7 such as a ceramic pipe spout pipe. There is. Reference numeral 11 is a sprue cup set on the upper end of the non-disappearing sprue pipe 7, and 12 is a feeder cup set on the upper end of the self-hardening mold 1.
A decompression wire netting pipe 8 is provided in the frame 3, and a film 9 for decompression sealing is set on the surface of the dry sand 4 by being pressed by a film protection lid 10. The decompression of is surely performed.
【０００９】このようにセットを完了した後、枠３内を
減圧用金網パイプ８によって減圧するとともに、湯口カ
ップ11の上部から図３のように溶湯を注湯する。溶湯は
非消失性湯口管７を介して消失性湯口管５に達し、これ
を消失させながらストレーナホール６から自硬性鋳型１
の型内空間に鋳込まれる。After the setting is completed in this way, the inside of the frame 3 is depressurized by the depressurizing wire netting pipe 8 and the molten metal is poured from the upper part of the sprue cup 11 as shown in FIG. The molten metal reaches the disappearing spout pipe 5 through the non-disappearing spout pipe 7, and the self-hardening mold 1 is discharged from the strainer hole 6 while disappearing the spout.
It is cast into the mold space.
【００１０】このとき消失性湯口管５から少量のスス等
が発生するが、本発明で用いられる消失性湯口管５の発
泡性樹脂の量は従来のフルモールド鋳造法で用いられる
発泡性樹脂の量の1/10〜1/20と非常に少ないためにスス
等の発生量はごく微量であり、減圧用金網パイプ８から
-500mmHg程度の真空で吸引されて外部へ排出される。ま
た残渣、ドロス等は小断面積のストレーナホール６によ
り止められ、型内空間への流入が防止される。このた
め、本発明によれば従来のフルモールド鋳造法で見られ
たような未消失残渣による品質不良を防止することがで
き、低炭素鋼やステンレス鋳鋼に用いても加炭現象を生
ずることがない。At this time, a small amount of soot or the like is generated from the disappearing spout pipe 5, but the amount of the foaming resin of the disappearing spout pipe 5 used in the present invention is the same as that of the foaming resin used in the conventional full mold casting method. The amount of soot and so on is extremely small because it is 1/10 to 1/20 of the amount.
-Suctioned in a vacuum of about 500 mmHg and discharged to the outside. Further, the residue, dross, etc. are stopped by the strainer hole 6 having a small cross-sectional area, and the inflow into the space inside the mold is prevented. Therefore, according to the present invention, it is possible to prevent quality defects due to undisappeared residues as seen in the conventional full mold casting method, and even when used for low carbon steel or stainless cast steel, a carburization phenomenon may occur. Absent.
【００１１】またこの自硬性鋳型１は十分な強度を持つ
ので、実施例のような長尺で大型の鋳造品でも変形・歪
を生ずることがない。更に、本発明では枠３内を減圧し
つつ注湯するため、従来のシェルモールド法のような溶
湯の凝固過程において生ずる外部引け巣や気泡等を防止
するための大きな押湯溜、揚がり等を設ける必要がな
く、むだ湯を大幅に削減することができる。なお、大量
生産のために消失性湯口管５へ消失性模型からなる堰を
多数接続して同時に多数の製品を鋳込むことも可能であ
るから、中型、大型製品においても歩留りの良い鋳造が
可能である。Further, since the self-hardening mold 1 has sufficient strength, it does not cause deformation or distortion even in a long and large cast product as in the embodiment. Further, in the present invention, the inside of the frame 3 is depressurized while pouring the molten metal, so that a large riser pool, frying or the like for preventing external shrinkage cavities, bubbles and the like which are generated in the solidification process of the molten metal as in the conventional shell molding method is used. There is no need to provide it, and waste water can be significantly reduced. For mass production, it is possible to connect many weirs made of fusible models to the fusible sprue pipe 5 and cast many products at the same time. Therefore, it is possible to cast with good yield even for medium-sized and large-sized products. Is.
【００１２】このようにして鋳造が完了したら、枠３内
を大気圧に戻して乾燥砂４を流動化させ、自硬性鋳型１
と鋳造品を取り出す。このとき消失性湯口管５は消失し
ているために非消失性湯口管７と自硬性鋳型１とは分離
されており、鋳造後の後処理工程に手数を要しない。When the casting is completed in this way, the inside of the frame 3 is returned to atmospheric pressure to fluidize the dry sand 4, and the self-hardening mold 1
And take out the casting. At this time, since the disappearing sprue pipe 5 has disappeared, the non-disappearing sprue pipe 7 and the self-hardening mold 1 are separated, and the post-treatment process after casting does not require any trouble.
【００１３】[0013]
【発明の効果】以上に説明したように、本発明の減圧シ
ェルモールド鋳造法によれば、小物から大物までスス等
の不純物混入や変形・歪のない精密鋳造が可能である。
また本発明によれば、多くのむだ湯を生ずることなく外
部引け巣や気泡等を防止することができ、また鋳造後の
後処理工程を削減することもできる。このように本発明
は従来のシェルモールド鋳造法と減圧フルモールド鋳造
法の長所を巧みに組合せることにより、安定した大量鋳
造を可能としたものであり、従来の問題点を解決した鋳
造法として、産業の発展に寄与するところは極めて大き
いものである。As described above, according to the vacuum shell mold casting method of the present invention, it is possible to perform precision casting from small items to large items without inclusion of impurities such as soot and deformation / distortion.
Further, according to the present invention, it is possible to prevent external shrinkage cavities, air bubbles, etc. without producing much waste water, and it is also possible to reduce the post-treatment process after casting. Thus, the present invention enables stable mass casting by skillfully combining the advantages of the conventional shell mold casting method and reduced pressure full mold casting method, and as a casting method that solves the conventional problems. However, the area that contributes to the development of the industry is extremely large.
【図１】本発明の実施例に用いられる自硬性鋳型の断面
図である。FIG. 1 is a cross-sectional view of a self-hardening mold used in an example of the present invention.
【図２】本発明の実施例の工程を示す断面図である。FIG. 2 is a cross-sectional view showing the steps of the embodiment of the present invention.
【図３】本発明の実施例の工程を示す断面図である。FIG. 3 is a cross-sectional view showing the steps of the embodiment of the present invention.
１ 自硬性鋳型 ３ 枠 ５ 消失性湯口管 ７ 非消失性湯口管 1 Self-hardening mold 3 Frame 5 Disappearing sprue pipe 7 Non-disappearing sprue pipe
Claims (1)
ラン樹脂又はCO2 砂からなる自硬性鋳型を埋設するとと
もに、発泡性樹脂からなる消失性湯口管の先端を自硬性
鋳型の下部のストレーナホールに密着させることによっ
てこの自硬性鋳型の型内空間と非消失性湯口管とを接続
し、枠内を減圧しながら溶湯を注湯して消失性湯口管を
消失させながらストレーナホールを介して型内空間への
鋳込みを行うことを特徴とする減圧シェルモールド鋳造
法。1. A self-hardening mold made of shell mold / furan resin or CO 2 sand is embedded in a depressurizable frame, and the tip of a fusible spout made of foaming resin is self-hardening.
By making a close contact with the strainer hole at the bottom of the mold
Te connects the mold space of the self-hardening mold and non-depleting stalk, the fugitive stalk by pouring the molten metal while reducing the pressure inside the frame
While disappearing, through the strainer hole to the space inside the mold
A reduced pressure shell mold casting method characterized by performing casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5015138A JPH0818122B2 (en) | 1993-02-02 | 1993-02-02 | Vacuum shell mold casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5015138A JPH0818122B2 (en) | 1993-02-02 | 1993-02-02 | Vacuum shell mold casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06226422A JPH06226422A (en) | 1994-08-16 |
| JPH0818122B2 true JPH0818122B2 (en) | 1996-02-28 |
Family
ID=11880464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5015138A Expired - Fee Related JPH0818122B2 (en) | 1993-02-02 | 1993-02-02 | Vacuum shell mold casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0818122B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102225462A (en) * | 2011-02-23 | 2011-10-26 | 谭哲豪 | Vacuum casting method for sealing feed port by adopting foam plastic |
| CN103920852A (en) * | 2014-04-30 | 2014-07-16 | 三明市毅君机械铸造有限公司 | Precision casting process of large casting |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6209616B1 (en) * | 1997-06-20 | 2001-04-03 | Richard F. Polich | Vacuum-assisted, gravity-fed casting apparatus and method |
| US6619373B1 (en) * | 2002-04-25 | 2003-09-16 | General Motors Corporation | Lost foam casting apparatus for reducing porosity and inclusions in metal castings |
| US6886621B1 (en) * | 2002-08-29 | 2005-05-03 | Brunswick Corp. | Sprue for a lost foam casting system for biasing a directional fill rate from a bottom portion of a metal casting |
| JPWO2011013730A1 (en) * | 2009-07-31 | 2013-01-10 | 森川産業株式会社 | Casting unit and casting method |
| KR101523875B1 (en) * | 2014-02-24 | 2015-07-15 | (주)씨엠캐스팅테크놀러지 | Decompression casting apparatus |
| CN109226686A (en) * | 2018-11-29 | 2019-01-18 | 芜湖新兴新材料产业园有限公司 | The method of casting scab is prevented in lost foam casting process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63281757A (en) * | 1987-05-14 | 1988-11-18 | Tsuneo Yamashita | Reduced pressure casting method using lost form pattern |
| CA2049228C (en) * | 1990-09-06 | 1996-10-15 | George D. Chandley | Countergravity casting using particulate supported thin walled investment shell mold |
-
1993
- 1993-02-02 JP JP5015138A patent/JPH0818122B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102225462A (en) * | 2011-02-23 | 2011-10-26 | 谭哲豪 | Vacuum casting method for sealing feed port by adopting foam plastic |
| CN103920852A (en) * | 2014-04-30 | 2014-07-16 | 三明市毅君机械铸造有限公司 | Precision casting process of large casting |
| CN103920852B (en) * | 2014-04-30 | 2015-09-02 | 三明市毅君机械铸造有限公司 | A kind of precision casting process of large foundry goods |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06226422A (en) | 1994-08-16 |
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