JPS63273543A - Production of cavity in mold - Google Patents
Production of cavity in moldInfo
- Publication number
- JPS63273543A JPS63273543A JP10752487A JP10752487A JPS63273543A JP S63273543 A JPS63273543 A JP S63273543A JP 10752487 A JP10752487 A JP 10752487A JP 10752487 A JP10752487 A JP 10752487A JP S63273543 A JPS63273543 A JP S63273543A
- Authority
- JP
- Japan
- Prior art keywords
- pattern
- mold
- melting point
- cavity
- metal
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 13
- 229910001245 Sb alloy Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229920006328 Styrofoam Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
、本発明は、たとえば、複雑な形状をなしたポンプのベ
ーン等を鋳造するに際し、必要とされる鋳型キャビティ
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a mold cavity required when, for example, casting a pump vane or the like having a complicated shape.
（従来技術とその問題点）
従来、複雑な形状をなし、模型の一体抜きが不可能な形
状をなした鋳物あるいは模型抜き勾配がとれない鋳物を
製造する場合、種々の方法が採用されている。その方法
として、
■ 模型を分割型として、自硬性砂型内に埋設し、各分
割型をそれに適した方向から引き抜いて、鋳型にキャビ
ティを形成する方法があるが、この場合、キャビティ自
体に分割面があるため、キャビティの合わせ鋳張り、凹
凸が発生し、仕上げが必要であるとともに、寸法精度が
狂い易い。(Prior art and its problems) Conventionally, various methods have been used to manufacture castings that have complex shapes that make it impossible to cut out the model in one piece, or where the draft angle of the model cannot be taken. . One method is to: ■ bury the model as a split mold in a self-hardening sand mold, and then pull out each split mold from an appropriate direction to form a cavity in the mold; As a result, the cavity is laminated, unevenness occurs, and finishing is required, and dimensional accuracy is likely to be lost.
■ また、少なくとも２つの砂型を組み合わせることに
よりキャビティを形成する方法もあるが、砂型に多数の
分割面があるため、組み合わせ工数の増大と、組み合わ
せ誤差の集積、合わせ面の鋳張り、寸法精度の狂い等が
発生しやすい。■Also, there is a method of forming a cavity by combining at least two sand molds, but since the sand mold has many dividing surfaces, it increases the number of assembly steps, accumulates assembly errors, casts the mating surfaces, and impairs dimensional accuracy. Misalignment is likely to occur.
■ さらに、パターンに消失性材料を使用する方法があ
る。これは、予め、発泡スチロール等にて所望キャビテ
ィ形状のパターンにを作り、これを自硬性砂型内に埋設
し、パターンの低温気化性を利用して、溶湯と置換させ
る方法である。■ There is also a method of using fugitive materials in the pattern. This is a method in which a pattern with a desired cavity shape is made in advance using foamed polystyrene or the like, which is buried in a self-hardening sand mold, and is replaced with molten metal by utilizing the pattern's low-temperature vaporization properties.
−しかしながら、この方法を極めて薄肉のもの、あるい
は薄くてねじれているものや長尺のもの等に適用すると
、発泡スチロール等は剛性が小さいので、砂込め時に変
形したり、寸法精度が狂い易く、かつ、溶湯との置換時
に有害ガスが発生するという問題を有する。-However, if this method is applied to extremely thin, thin, twisted, or long objects, Styrofoam, etc. has low rigidity, so it may easily deform during filling with sand or lose dimensional accuracy. However, there is a problem in that harmful gases are generated when replacing with molten metal.
■ その他、ロストワックス法も知られているが、これ
はワックスでパターンを作り、耐火性スラリーを充填後
、加熱し、鋳型を硬化させるとともに、ワックスを溶出
させてキャビティを作るものであるが、ワックス溶出ま
でに多大の時間を必要とするばかりか、強度上、大型の
ものには適しない。■ Another known method is the lost wax method, which involves creating a pattern with wax, filling it with a refractory slurry, heating it, hardening the mold, and eluting the wax to create a cavity. Not only does it take a long time to elute the wax, but it is not suitable for large-sized products due to its strength.
■ なお、パターンを特殊樹脂で作り、このパターンを
自硬性砂型内に埋設してこれを加熱し、樹脂を可塑状態
として引き抜く方法もあるが、パターン製作に時間がか
かり、かつ、樹脂が高価であるばかりか、樹脂を反覆使
用することができず、極めて高価になるという問題を有
する。■ There is also a method of making a pattern with a special resin, burying this pattern in a self-hardening sand mold, heating it, and pulling out the resin in a plastic state, but it takes time to make the pattern and the resin is expensive. In addition, there are problems in that the resin cannot be used repeatedly and is extremely expensive.
本発明は、前記パターンを低融点金属で製作することに
より前記問題点を解決することのできる鋳型キャビティ
の製造方法を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a mold cavity that can solve the above problems by manufacturing the pattern using a low melting point metal.
（問題点を解決すべき手段）
本発明は前記目的を達成するために、鋳型キャビティを
、Ｂ１−Ｓｎ−Ｐｂ−３ｂ系合金等の低融点金属から作
ったパターンを自硬性砂型内に埋設し、鋳型硬化後、５
０〜１００℃の高温雰囲気で前記パターンを溶出させて
鋳型内にキャビティを形成するようにしたものである。(Means to Solve the Problems) In order to achieve the above object, the present invention provides a mold cavity by embedding a pattern made of a low melting point metal such as a B1-Sn-Pb-3b alloy in a self-hardening sand mold. , after mold hardening, 5
The pattern is eluted in a high temperature atmosphere of 0 to 100°C to form a cavity in the mold.
（実施例）
つぎに、本発明を一実施例である図面にしたがって説明
する。(Example) Next, the present invention will be explained according to the drawings which are one example.
まず、所望部材と同一形状の木型ｌを製作しく第１イ図
）、この木型１の下面側に常法で捨型２を作る（第１０
図）。その後、この捨を２の周囲に木枠３を設け、かつ
、木型ｌの項部に湯口４を設けて、下記するパターン用
金属より約１００℃高い溶融点をもつ、たとえば、Ｂ１
−３ｎ−Ｐｂ−Ｓｂ系合金（アサヒメタル（株）Ｕアレ
イ１５０（商品名））等の低融点金属５の溶湯を鋳込み
、上金型Ａを作る（第１ハ図）。そして、この上金型Ａ
を取り外しく第に図）、前記低融′点金属５の代わりに
石膏６を注入しく第１ホ図）、硬化後、木枠３全体を上
下逆にして、捨型２を取り外すとともに、前記低融点金
属５と同一金属溶湯を木型１の上方に注入し、下金型Ｂ
とする（第１へ図）。その後、下金型Ｂを木型Ｉから分
離して（第１ト、チ図）、上、下金型Ａ、Ｂを得る。First, a wooden mold l having the same shape as the desired member is made (Fig. 1A), and a waste mold 2 is made on the bottom side of this wooden mold 1 using the usual method (Fig. 10).
figure). Thereafter, a wooden frame 3 is provided around this mold 2, and a sprue 4 is provided at the neck of the wooden mold 1.
A molten metal 5 of a low melting point metal 5 such as -3n-Pb-Sb alloy (Asahi Metal Co., Ltd. U Array 150 (trade name)) is cast to form an upper mold A (Fig. 1C). And this upper mold A
After curing, turn the entire wooden frame 3 upside down, remove the waste mold 2, and inject plaster 6 in place of the low melting point metal 5. The same molten metal as the low melting point metal 5 is poured into the upper part of the wooden mold 1, and the lower mold B
(see figure 1). Thereafter, the lower mold B is separated from the wooden mold I (Figures 1 and 5) to obtain upper and lower molds A and B.
ついで、前記のようにして得られた上、下金型Ａ、Ｈの
合わせ面等を、場合によって修正して一体化し、両全型
Ａ、Ｂ間で形成される前記木型ｌと同一形状のキャビテ
ィ７に、前記湯口４から前記低融点金属５よりも低融点
である、たとえば、Ｂ１−Ｓｎ−Ｐｂ−Ｓｂ系合金（ア
サヒメタル（株）Ｕアレイ５゜（商品名））である低融
点金属８の溶湯を注入し、パターンＣを得る（第１す、
ヌ図）。Next, the mating surfaces of the upper and lower molds A and H obtained as described above are modified as necessary and integrated to form the same shape as the wooden mold L formed between both molds A and B. A metal having a lower melting point than the low melting point metal 5, for example, a B1-Sn-Pb-Sb alloy (Asahi Metal Co., Ltd. U array 5° (trade name)) is poured into the cavity 7 from the sprue 4. Inject molten metal of melting point metal 8 to obtain pattern C (first step,
nu figure).
なお、木型製メス型より、直接、金型を作ることも可能
である。It is also possible to make a mold directly from a wooden female mold.
ところで、前記低融点金属５．８は下表に示すなお、パ
ターンＣの注入口部９は離型後、除去する。また、同一
パターンＣを多数必要とする場合には、両全型Ａ、Ｂを
繰り返し使用して所望個数得ることは云うまでもない。Incidentally, the low melting point metal 5.8 is shown in the table below, and the injection port 9 of pattern C is removed after the mold is released. Furthermore, if a large number of the same pattern C is required, it goes without saying that both types A and B can be used repeatedly to obtain the desired number.
つまり、前記パターンＣを所望形状のベーンと同−丈法
のものとすると、このパターンＣを、中子木型内にセ゛
ットし、自硬性砂でパターンＣを内蔵した中子を製作す
る。That is, assuming that the pattern C has the same length as the desired shape of the vane, this pattern C is set into a core wooden mold, and a core containing the pattern C is manufactured using self-hardening sand.
そして、この中子を温風炉内に装入し、たとえば、１０
０℃以下のパターンＣの溶融温度以上の温風で加熱する
と、前記パターンＱは溶解し、中子砂から溶出して回収
され、中子内にベーン形状のキャビティが得られる。Then, this core is charged into a hot air furnace, and for example, 10
When heated with hot air having a temperature higher than the melting temperature of pattern C, which is 0° C. or lower, the pattern Q is melted, eluted from the core sand and collected, and a vane-shaped cavity is obtained in the core.
したがって、ポンプケーシングの鋳型内に、前記キャビ
ティを有する中子を取付けて鋳込むことにより、複雑な
形状を有するベーンをもったポンプケーシングを製作す
ることができる。Therefore, by attaching and casting the core having the cavity into the mold of the pump casing, it is possible to manufacture a pump casing having vanes having a complicated shape.
なお、前記説明では、キャビティを中子に形成する場合
を示したが、本発明において、鋳型とは、中子は勿論、
主型等を含む概念である。In addition, in the above description, the case where the cavity is formed in the core is shown, but in the present invention, the mold refers to not only the core but also the core.
This is a concept that includes main types.
また、実験によれば、中子砂から約９８％以上の低融点
金属を回収することができた。Also, according to experiments, it was possible to recover about 98% or more of low melting point metals from core sand.
（発明の効果）
以上の説明から明らかなように、本発明によれば、キャ
ビティを形成するパターンは、金属であって、常温で十
分な剛性を有するため、自硬性砂型への埋設作業にあた
り、たとえ、薄くかつ、長尺のものであっても、変形す
ることがない。しかも、このパターンは溶出してキャビ
ティを形成するため、いかに複雑な形状のパターンであ
っても、一体型であり、鋳張等が発生せず、後加工を必
要としない。また、パターンを、形成する金属は、低融
点金属であるため、キャビティ形成のため加熱すると溶
出して回収することができる。したがって、繰り返し使
用できるため、ランニングコストを極めて安価にするこ
とができる等の効果を奏する。(Effects of the Invention) As is clear from the above description, according to the present invention, the pattern forming the cavity is made of metal and has sufficient rigidity at room temperature. Even if it is thin and long, it will not deform. Moreover, since this pattern is eluted to form a cavity, no matter how complex the pattern is, it is a one-piece type, does not cause casting or the like, and does not require post-processing. Further, since the metal used to form the pattern is a low melting point metal, it can be eluted and recovered when heated to form a cavity. Therefore, since it can be used repeatedly, the running cost can be extremely reduced.
第１イ図から第１ヌ図は本発明に使用する低融点金属か
らなるパターンの製造方法を示す図であ１〜木型、２〜
捨型、７〜キャビテ仏８〜低融点金属、Ａ〜上金型、Ｂ
〜下金型、Ｃ〜パターン。
特許出願人 株式会社西島製作所
代理人弁理士 青 山 葆ほか２名第１図
（イ） でゴヱ２ミｌ−一−１
ａｚゲ介＼８Figures 1 A to 1 N are diagrams showing a method for manufacturing a pattern made of a low melting point metal used in the present invention.
Waste mold, 7 ~ Cavity Buddha 8 ~ Low melting point metal, A ~ Upper mold, B
~Lower mold, C~ pattern. Patent applicant Nishijima Seisakusho Co., Ltd. Patent attorney Aoyama Sho and two others Figure 1 (a) Degoe2mil-1-1 az Gesuke\8
Claims (1)
らなるパターンを、自硬性砂型内に埋設し、鋳型硬化後
、５０〜１００℃の高温雰囲気で前記パターンを溶出さ
せて鋳型内にキャビティを形成することを特徴とする鋳
型キャビティの製造方法。(1) A pattern made of a low melting point metal such as Bi-Sn-Pb-Sb alloy is buried in a self-hardening sand mold, and after the mold hardens, the pattern is eluted in a high temperature atmosphere of 50 to 100°C and placed inside the mold. A method for manufacturing a mold cavity, the method comprising forming a cavity in a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10752487A JPS63273543A (en) | 1987-04-30 | 1987-04-30 | Production of cavity in mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10752487A JPS63273543A (en) | 1987-04-30 | 1987-04-30 | Production of cavity in mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63273543A true JPS63273543A (en) | 1988-11-10 |
Family
ID=14461376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10752487A Pending JPS63273543A (en) | 1987-04-30 | 1987-04-30 | Production of cavity in mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63273543A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49105718A (en) * | 1973-02-14 | 1974-10-07 | ||
| JPS5877740A (en) * | 1981-11-04 | 1983-05-11 | Mitsubishi Heavy Ind Ltd | Investment casting pattern |
-
1987
- 1987-04-30 JP JP10752487A patent/JPS63273543A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49105718A (en) * | 1973-02-14 | 1974-10-07 | ||
| JPS5877740A (en) * | 1981-11-04 | 1983-05-11 | Mitsubishi Heavy Ind Ltd | Investment casting pattern |
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