JPH0457419B2 - - Google Patents
Info
- Publication number
- JPH0457419B2 JPH0457419B2 JP5822785A JP5822785A JPH0457419B2 JP H0457419 B2 JPH0457419 B2 JP H0457419B2 JP 5822785 A JP5822785 A JP 5822785A JP 5822785 A JP5822785 A JP 5822785A JP H0457419 B2 JPH0457419 B2 JP H0457419B2
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- mold
- model
- fugitive
- foam material
- 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
Links
- 238000000034 method Methods 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 15
- 239000006261 foam material Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 10
- 238000005187 foaming Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000011324 bead Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000005495 investment casting Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 239000004794 expanded polystyrene Substances 0.000 description 3
- 238000010115 full-mold casting Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、鋳造用消失性中空模型の製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a fugitive hollow model for casting.
（従来の技術）
鋳物を連続的に多量に精密鋳造する方法として
フルモールド鋳造法、インベストメント鋳造法等
がある。フルモールド鋳造法は、発泡ポリスチレ
ン（発泡材）等により湯口系も含めて一体とした
現物型の消失性模型を作り、砂型の中に模型を埋
め込んで鋳型とする方法である。この鋳造法で
は、模型を鋳型に収めた状態で溶湯を流し込み、
溶湯の高熱で模型を消失させることにより、鋳型
内に上記模型と同形状の鋳物を鋳造するものであ
る。また、インベストメント鋳造法は、ろう、プ
ラスチツク、発泡ポリスチレン（発泡材）等で消
失性模型を作り、この模型に耐火物の膜を被せ、
それを耐火物の枠の中に埋め込んで鋳型とする方
法である。この鋳造法では、鋳型内の模型を加熱
して溶解、消失させて模型を取り除いた後で、鋳
型内に形成されたキヤビテイに溶湯を流し込んで
鋳物を鋳造するものである。(Prior Art) There are full mold casting methods, investment casting methods, and the like as methods for continuously precision casting large quantities of castings. The full-mold casting method is a method in which a fugitive model is made of expanded polystyrene (foamed material) or the like, including the sprue system, in an integrated form, and the model is embedded in a sand mold to form a casting mold. In this casting method, the model is placed in a mold and molten metal is poured into it.
By causing the model to disappear with the high heat of the molten metal, a casting having the same shape as the model is cast into the mold. In addition, in the investment casting method, a fugitive model is made of wax, plastic, expanded polystyrene (foamed material), etc., and this model is covered with a refractory film.
This method involves embedding it in a refractory frame and making it into a mold. In this casting method, the model in the mold is heated to melt and disappear, and after the model is removed, molten metal is poured into a cavity formed in the mold to cast a casting.
上記のいずれの鋳造法においても、発泡ポリス
チレン（発泡材）等からなる消失性模型が用いら
れている。この模型は、消失時にガスを発生す
る。このガスが多量発生するとブローホール、ピ
ンホール等の原因となるため、ガスの発生量を少
なくして鋳造できるように、中空の消失性模型を
使用している。この中空の消失性模型を製造する
方法として、例えば、特開昭59−191541号公報等
のものがある。この公報に示される方法は、別々
に一対の分割模型を成形し、これら分割模型を接
合一体化して消失性中空模型を製造する方法であ
る。 In any of the above casting methods, a fugitive model made of expanded polystyrene (foamed material) or the like is used. This model emits gas when it disappears. If a large amount of this gas is generated, it can cause blowholes, pinholes, etc., so a hollow fugitive model is used so that casting can be performed with less gas generation. As a method for manufacturing this hollow disappearing model, there is a method disclosed in, for example, Japanese Patent Application Laid-Open No. 191541/1983. The method disclosed in this publication is a method in which a pair of split models are molded separately, and the split models are joined and integrated to produce a fugitive hollow model.
（発明が解決しようとしている問題点）
上記方法では、分割模型の接合工程を必要とす
るため、生産性が悪かつた。また、模型肌に接合
部ができ、その分、模型の精度が劣る欠点があつ
た。さらに、分割模型同士を寸法差なく精密に接
合するのが難しく、この点からも寸法精度が悪か
つた。(Problems to be Solved by the Invention) The above method requires a step of joining the divided models, resulting in poor productivity. Another drawback was that joints were formed on the model skin, which made the model less accurate. Furthermore, it was difficult to precisely join the divided models without any dimensional difference, and from this point of view as well, the dimensional accuracy was poor.
（問題点を解決するための手段）
この発明は、上記問題点を解決するためになさ
れたもので、その要旨は、(1)多孔性材料からなる
一対の成形型を閉じてこれら成形型間にキヤビテ
イを形成し、次に上記成形型の外側から吸引して
キヤビテイ内を減圧するとともに、成形型の供給
口から一次発泡させた発泡材を上記キヤビテイに
供給し、このキヤビテイの成形面に上記発泡材を
吸着させ、この吸着状態で上記発泡材を加熱して
二次発泡させることにより、中空模型を成形する
ことを特徴とする鋳造用消失性中空模型の製造方
法、(2)前記発泡材のキヤビテイへの供給は高圧空
気によつて行なわれることを特徴とする特許請求
の範囲第１項に記載の鋳造用消失性中空模型の製
造方法、(3)前記発泡材の加熱はキヤビテイへ高温
蒸気を吹き込むことによつて行なわれることを特
徴とする特許請求の範囲第１項または第２項に記
載の鋳造用消失性中空模型の製造方法にある。(Means for Solving the Problems) This invention was made to solve the above problems, and its gist is (1) closing a pair of molds made of porous material to create a space between the molds. Next, the inside of the cavity is depressurized by suction from the outside of the mold, and the primary foamed foam material is supplied to the cavity from the supply port of the mold. A method for manufacturing a fugitive hollow model for casting, characterized in that a hollow model is formed by adsorbing a foam material and heating the foam material in this adsorbed state to cause secondary foaming, (2) the foam material The method for producing a fugitive hollow model for casting according to claim 1, characterized in that the supply of the foamed material to the cavity is performed by high-pressure air, (3) the heating of the foamed material is carried out by high-temperature air to the cavity. A method for producing a fugitive hollow model for casting according to claim 1 or 2, characterized in that the method is carried out by blowing steam.
（実施例）
以下、この発明を第１図から第４図を参照して
説明する。(Example) The present invention will be described below with reference to FIGS. 1 to 4.
まず、この発明方法を実施するに際して使用さ
れる原型の一例を、第１図を参照して説明する。
この原型１１は、例えばフルモールド鋳造法に用
いられる消失性中空模型１を製造するものであ
る。原型１１は対をなしており、多孔性セラミツ
ク（多孔性材料）からなる成形型１２と、この成
形型１２の外面に取り付けられた減圧型１３とに
より構成されている。 First, an example of a prototype used in carrying out the method of this invention will be explained with reference to FIG.
This prototype 11 is used to manufacture a fugitive hollow model 1 used, for example, in a full mold casting method. The master molds 11 form a pair and are composed of a mold 12 made of porous ceramic (porous material) and a vacuum mold 13 attached to the outer surface of the mold 12.
成形型１２には、所定形状をなした成形面１４
が形成されている。上記一対の原型１１，１１を
閉じると、対向する各成形面１４によつてキヤビ
テイ１５が形成されるようになつている。また、
閉じられた一対の原型１１，１１間には、キヤビ
テイ１５に連通する供給口１６が形成されてい
る。成形型１２の内部には冷却用配管１７が埋め
込まれている。この冷却用配管１７は、冷却水供
給装置１８に接続されている。 The mold 12 has a molding surface 14 having a predetermined shape.
is formed. When the pair of master molds 11, 11 are closed, a cavity 15 is formed by the opposing molding surfaces 14. Also,
A supply port 16 communicating with the cavity 15 is formed between the pair of closed master molds 11, 11. A cooling pipe 17 is embedded inside the mold 12 . This cooling pipe 17 is connected to a cooling water supply device 18.
減圧型１３内は、密閉された空洞部１９になつ
ている。減圧型１３の成形型１２側には、多数の
連通孔２０がそれぞれ形成されている。各連通孔
２０はフイルター２１を介して、成形型１２に形
成された無数の連続した微細孔に連通している。
また、減圧型１３には減圧口２２が設けられてい
る。この減圧口２２は、配管２３を介して真空ポ
ンプ２４に接続されている。 The inside of the decompression mold 13 is a sealed cavity 19. A large number of communication holes 20 are formed on the mold 12 side of the decompression mold 13, respectively. Each communication hole 20 communicates with countless continuous fine holes formed in the mold 12 via a filter 21 .
Further, the pressure reduction mold 13 is provided with a pressure reduction port 22 . This pressure reducing port 22 is connected to a vacuum pump 24 via a pipe 23.
次に、この発明方法による中空模型１の製造を
第１図から第４図までの図面に従つて説明する。 Next, the manufacture of the hollow model 1 by the method of this invention will be explained with reference to the drawings from FIG. 1 to FIG. 4.
第１図に示す状態から、一対の原型１１，１１
を連結装置（図示しない）により閉じる。これに
より一対の原型１１，１１の成形型１２，１２間
には、キヤビテイ１５が形成される。 From the state shown in FIG.
are closed by a coupling device (not shown). As a result, a cavity 15 is formed between the molds 12 and 12 of the pair of master molds 11 and 11.
次に、真空ポンプ２４を稼働させて減圧型１３
の空洞部１９内の空気を吸引する。これにより、
連通孔２０および成形型１２の微細孔を介してキ
ヤビテイ１５内を減圧する。この減圧状態で、第
２図に示す矢印のように、供給口１６から一次発
泡ポリスチレンのビーズ２（発泡材）を上記キヤ
ビテイ１５に供給する。この供給は高圧空気によ
る吹き込みによつて行う。キヤビテイ１５内は減
圧状態であるため、キヤビテイ１５に成形面１４
に上記ビーズ２を吸着できる。このビーズ２の供
給は、成形面１４に所定肉厚吸着されるまで行
う。なお、この肉厚が全面にほぼ均一になるのが
望ましいが、各部位によつて肉厚が多少異なつて
もよい。 Next, the vacuum pump 24 is operated to
The air inside the cavity 19 is sucked. This results in
The pressure inside the cavity 15 is reduced through the communication hole 20 and the fine holes of the mold 12. In this reduced pressure state, primary foamed polystyrene beads 2 (foamed material) are supplied to the cavity 15 from the supply port 16 as indicated by the arrow shown in FIG. This supply is carried out by blowing with high pressure air. Since the inside of the cavity 15 is in a reduced pressure state, the molding surface 14 is attached to the cavity 15.
The beads 2 can be adsorbed to. This supply of beads 2 is continued until the beads 2 are adsorbed to the molding surface 14 to a predetermined thickness. Although it is desirable that this wall thickness be substantially uniform over the entire surface, the wall thickness may vary somewhat depending on each part.
この吸着状態で、第３図に示すように、供給口
１６より高温蒸気Ａを吹き込み、上記ビーズ２を
加熱する。この加熱により、ビーズ２は二次発泡
して互いに結合し、中空部３を有した中空模型１
が成形される。 In this adsorption state, as shown in FIG. 3, high-temperature steam A is blown from the supply port 16 to heat the beads 2. By this heating, the beads 2 undergo secondary foaming and are bonded to each other, forming a hollow model 1 having a hollow part 3.
is formed.
次に、真空ポンプ２３の稼働を停止させる。そ
して、冷却水供給装置１８を稼働させて冷却用配
管１７に冷却水を供給して各成形型１２を冷却す
る。これにより、上記中空模型１が固まる。 Next, the operation of the vacuum pump 23 is stopped. Then, the cooling water supply device 18 is operated to supply cooling water to the cooling pipe 17 to cool each mold 12. As a result, the hollow model 1 is solidified.
そして、第４図に示すように、一対の原型１
１，１１を開いて、上記キヤビテイ１５内から中
空模型１を取り出す。 Then, as shown in FIG. 4, a pair of prototypes 1
1 and 11 and take out the hollow model 1 from inside the cavity 15.
この発明は上記一実施例に制約されず種々の態
様が可能である。例えば、成形型を加熱して発泡
材を二次発泡させてもよい。なお、この発明は、
インベストメント鋳造法に用いられる消失性模型
を製造する場合にも適用できるものである。 This invention is not limited to the above-mentioned embodiment, and various embodiments are possible. For example, the mold may be heated to cause secondary foaming of the foam material. In addition, this invention
It can also be applied to the production of fugitive models used in investment casting methods.
（発明の効果）
以上説明したように、この発明では、発泡材を
キヤビテイの成形面に吸着させて、消失性中空模
型を成形するものであり、成形が容易である。ま
た、従来方法のような分割模型の接合工程を必要
とせず、生産性を向上させることができる。さら
に、接合に伴う寸法精度の低下を防止でき、高精
度にすることができる。(Effects of the Invention) As explained above, in the present invention, a fugitive hollow model is molded by adsorbing the foam material to the molding surface of the cavity, and molding is easy. Furthermore, productivity can be improved without requiring a step of joining divided models as in the conventional method. Furthermore, it is possible to prevent a decrease in dimensional accuracy due to bonding, and high precision can be achieved.
第１図から第４図までの図面はこの発明の一実
施例を示すものであり、第１図は一対の原型が閉
じる前の状態を示す断面図、第２図はキヤビテイ
の成形面に発泡材を吸着させた状態を示す断面
図、第３図は発泡材を加熱した状態を示す断面
図、第４図は一対の原型を開いて中空模型を取り
出した状態を示す断面図である。
１……中空模型、２……ビーズ（発泡材）、１
２……成形型、１４……成形面、１５……キヤビ
テイ、１６……供給口。
The drawings from FIG. 1 to FIG. 4 show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing the state before the pair of prototypes are closed, and FIG. FIG. 3 is a cross-sectional view showing the foamed material in a heated state, and FIG. 4 is a cross-sectional view showing the hollow model taken out after opening the pair of master molds. 1...Hollow model, 2...Beads (foam material), 1
2... Molding die, 14... Molding surface, 15... Cavity, 16... Supply port.
Claims (1)
れら成形型間にキヤビテイを形成し、次に上記成
形型の外側から吸引してキヤビテイ内を減圧する
とともに、成形型の供給口から一次発泡させた発
泡材を上記キヤビテイに供給し、このキヤビテイ
の成形面に上記発泡材を吸着させ、この吸着状態
で上記発泡材を加熱して二次発泡させることによ
り、中空模型を成形することを特徴とする鋳造用
消失性中空模型の製造方法。 ２ 前記発泡材のキヤビテイへの供給は高圧空気
によつて行なわれることを特徴とする特許請求の
範囲第１項に記載の鋳造用消失性中空模型の製造
方法。 ３ 前記発泡材の加熱はキヤビテイへ高温蒸気を
吹き込むことによつて行なわれることを特徴とす
る特許請求の範囲第１項または第２項に記載の鋳
造用消失性中空模型の製造方法。[Scope of Claims] 1. A pair of molds made of porous material is closed to form a cavity between the molds, and then suction is applied from the outside of the mold to reduce the pressure inside the cavity, and the pressure inside the mold is reduced. A hollow model is formed by supplying the primary foamed foam material to the cavity from the supply port, adsorbing the foam material to the molding surface of the cavity, and heating the foam material in this adsorbed state to cause secondary foaming. A method for manufacturing a fugitive hollow model for casting, characterized by molding. 2. The method of manufacturing a fugitive hollow model for casting according to claim 1, wherein the foam material is supplied to the cavity using high-pressure air. 3. The method for manufacturing a fugitive hollow model for casting according to claim 1 or 2, wherein the foam material is heated by blowing high-temperature steam into the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5822785A JPS61219442A (en) | 1985-03-25 | 1985-03-25 | Production of consumable hollow pattern for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5822785A JPS61219442A (en) | 1985-03-25 | 1985-03-25 | Production of consumable hollow pattern for casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61219442A JPS61219442A (en) | 1986-09-29 |
| JPH0457419B2 true JPH0457419B2 (en) | 1992-09-11 |
Family
ID=13078192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5822785A Granted JPS61219442A (en) | 1985-03-25 | 1985-03-25 | Production of consumable hollow pattern for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61219442A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07102422B2 (en) * | 1987-06-22 | 1995-11-08 | 日立化成工業株式会社 | Molding method for vanishing foam model for casting method |
-
1985
- 1985-03-25 JP JP5822785A patent/JPS61219442A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61219442A (en) | 1986-09-29 |
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