JPH0335861A - Reduced-pressure sucking-up casting method - Google Patents
Reduced-pressure sucking-up casting methodInfo
- Publication number
- JPH0335861A JPH0335861A JP17154389A JP17154389A JPH0335861A JP H0335861 A JPH0335861 A JP H0335861A JP 17154389 A JP17154389 A JP 17154389A JP 17154389 A JP17154389 A JP 17154389A JP H0335861 A JPH0335861 A JP H0335861A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- chamber
- mold
- sucking
- pressure difference
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 210000003128 head Anatomy 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 210000004894 snout Anatomy 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は精密鋳造を可能ならしめる減圧吸上鋳造法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum wick casting method that enables precision casting.
減圧吸上鋳造法は、特公昭５２−３８９２４号公報或い
は特公昭６Ｇ−３５２２７号公報に開示されているよう
に、周知のロストワックス鋳造法における鋳込方法の改
良に係るもので、米国の大手ロストワックスメーカーで
あるヒツチナー社により開発されたものである。まずこ
の減圧吸上鋳造法の概略を第２ａ図〜第２ｃ図に従い説
明する。The vacuum wick casting method, as disclosed in Japanese Patent Publication No. 52-38924 or Japanese Patent Publication No. 6G-35227, is an improvement of the casting method in the well-known lost wax casting method, and is a method developed by a major American company. It was developed by Hutchner, a lost wax manufacturer. First, the outline of this vacuum wicking casting method will be explained with reference to FIGS. 2a to 2c.
第２ａ図において、１は金属をその融点以下に加熱して
溶融状態とした溶湯を保溜する湯槽、２はその上方に昇
降自在に支持されたチャンバ、３は鋳物砂を焼成して作
られた通気性の鋳型である。In Fig. 2a, 1 is a tank for storing molten metal heated to below its melting point, 2 is a chamber supported above it so that it can be raised and lowered, and 3 is a chamber made by firing foundry sand. It is a breathable mold.
鋳型３はスプル一部４を中心としてその周囲に該スプル
一部４とゲート５を介して連通ずる多数のキャビティ６
が放射状に形成されている。また該スプル一部４は上端
が閉塞され下方には筒状のスノート７が延設されその下
端に吸上口８が開口している。そして該スノートをチャ
ンバ２の底部開口９から下方に垂下するように該鋳型３
をチャンバ２内に設定している。しかしてチャンバ２を
第２ｂ図に示したように下降させ吸上口８を湯槽ｌの溶
湯中に浸漬しチャンバ２の吸気口ｌＯを真空ポンプに継
ぐことにより該チャンバ２内を減圧すると、鋳型３は通
気性であるので内部も減圧され吸上口８からスプル一部
４に溶湯が吸引され該溶湯はさらにゲート５を通りキャ
ビティ６に充満する。The mold 3 has a sprue part 4 at its center and a number of cavities 6 surrounding the sprue part 4 and communicating with the sprue part 4 through gates 5.
are formed radially. The upper end of the sprue portion 4 is closed, and a cylindrical snout 7 extends downward, with a suction port 8 opening at the lower end. Then, the snout is placed in the mold 3 so as to hang downward from the bottom opening 9 of the chamber 2.
is set in chamber 2. Then, the chamber 2 is lowered as shown in Fig. 2b, the suction port 8 is immersed in the molten metal in the bath l, and the inlet port lO of the chamber 2 is connected to a vacuum pump to reduce the pressure inside the chamber 2. 3 is breathable, so the pressure inside is also reduced, and the molten metal is sucked into the sprue part 4 from the suction port 8, and the molten metal further passes through the gate 5 and fills the cavity 6.
所定の保持時間が経過しゲート５の溶湯が凝固した後に
該チャンバ２の減圧状態を解くことによりスプル一部４
中にある未凝固の溶湯をその自重によって流出させ第２
Ｃ図に示したように該スプル一部４を空にできるように
している。そして該鋳型３をこわしキャビティ６に形成
された製品を取り出したときに各製品は湯道にて連なる
ことなく別体のものとして取り出せ製品切り離しの手間
が掛からない利点があると共に、スプル一部４から湯槽
１に戻された溶湯は次の鋳込に無駄なくｆ１１月できる
ので歩留がよく、さらには、溶湯の汚染がなく品質が向
上するなど種々の利点があるものである。After the predetermined holding time has elapsed and the molten metal in the gate 5 has solidified, the reduced pressure in the chamber 2 is released and the sprue portion 4 is removed.
The unsolidified molten metal inside is flowed out by its own weight and the second
As shown in Figure C, the sprue portion 4 can be emptied. Then, when the mold 3 is broken and the products formed in the cavity 6 are taken out, each product can be taken out as a separate product without being connected in a runner. The molten metal returned to the tundish tank 1 can be used for the next casting without any waste, resulting in a high yield.Furthermore, the molten metal is free from contamination and its quality is improved, among other advantages.
〔従来の技術の問題点〕
このように減圧吸上鋳造法は、鋳型がセットされたチャ
ンバ内を減圧し、外部と気圧差を生しさせることにより
溶湯を吸い上げるものであるから、実際の操業上はこの
気圧差が小さすぎる（減圧度が小さい）と鋳込時間がか
かるだけでなく湯廻りが悪く製品の肉薄部分に欠落が生
じるおそれがあり、反対に気圧差がありすぎると鋳型が
破裂するおそれがある。従ってチャンバ内外の気圧差を
いかに設定すべきかは減圧吸上鋳造法の成否を決定する
重要な要因であるが、従来この気圧差の決定は専ら技術
者の勘にたよっていた。このために失敗も多く歩留を悪
くする一因となっていた。[Problems with conventional technology] As described above, the vacuum wicking casting method sucks up the molten metal by reducing the pressure inside the chamber in which the mold is set and creating a pressure difference with the outside. If this pressure difference is too small (the degree of depressurization is small), not only will it take longer to cast, but the water circulation will be poor and there is a risk of chips in the thin parts of the product.On the other hand, if the pressure difference is too large, the mold will burst. There is a risk of Therefore, how to set the pressure difference between the inside and outside of the chamber is an important factor in determining the success or failure of the reduced pressure suction casting method, but conventionally the determination of this pressure difference has relied solely on the intuition of engineers. For this reason, there were many failures, which caused a decrease in yield.
本発明は上記問題点を解消し減圧吸上鋳造法における好
ましいチャンバ内外の気圧差を求める方法を提供し、こ
れにより減圧吸上鋳造法の歩留向上を目ざすと共にその
実施を容易ならしめんとするものである。The present invention solves the above-mentioned problems and provides a method for determining a preferable pressure difference between inside and outside of a chamber in vacuum wick casting, and thereby aims to improve the yield of vacuum wick casting and facilitate its implementation. It is something to do.
本発明の減圧吸上鋳造法は上記目的を達成するため、吸
上口が下端に形成された通気性の鋳型をチャンバにセッ
トし、該吸上口を溶湯中に浸漬して該チャンバ内を減圧
することにより溶湯を該チャンバ内外の気圧差で鋳型内
に吸い上げるようにした減圧吸上鋳造法であって、チャ
ンバ内外に溶湯の密度と溶湯の所要吸上揚程との積の１
．１倍〜１．４倍の気圧差を生じさせて溶湯を鋳型内に
吸い上げるようにしたことを特徴としたものである。In order to achieve the above-mentioned object, the vacuum wicking casting method of the present invention sets an air permeable mold with a wicking port formed at the lower end in a chamber, and immerses the wicking port into the molten metal to control the inside of the chamber. This is a vacuum wicking casting method in which the molten metal is sucked up into the mold by reducing the pressure between the inside and outside of the chamber, and the molten metal is sucked up into the mold by reducing the pressure inside and outside the chamber.
．． The feature is that the molten metal is sucked up into the mold by creating a pressure difference of 1 to 1.4 times.
第１図に示した鋳型３は、ロウで作られた原型（図示せ
ず）の表面に鋳物砂を多層にコーティングしこれを加熱
して該ロウを溶かし出すことにより製作された通気性を
有する中空殻状のものである。該鋳型３の各部には第２
ａ図〜第２ｃ図にても説明したように、スプル一部４、
ゲート５、キャビティ６、スノート７、吸上口８が形成
されている。しかして、この鋳型３における溶湯の所要
吸上揚程ｈｏは、第１図に示したように、湯槽１中の溶
湯を鋳型１の全キャビティ６のうち最も高所に位置して
いるキャビティ６の上面の高さをそのときの湯槽１の場
面から計った距離であり、この値がこの鋳型３の鋳込に
理論上必要な揚程となる。従ってこの揚程ｈ６を得るた
めに必要なチャンバ内外の気圧差Ｖｏは、溶湯の密度を
σとすると、ｖｏ−σ・ｈｏで表わされる。The mold 3 shown in FIG. 1 has air permeability and is manufactured by coating the surface of a master mold (not shown) made of wax with multiple layers of molding sand and heating it to melt the wax. It is hollow shell-like. Each part of the mold 3 has a second
As explained in Figures a to 2c, the sprue part 4,
A gate 5, a cavity 6, a snout 7, and a suction port 8 are formed. Therefore, the required suction head ho of the molten metal in the mold 3 is, as shown in FIG. This is the distance measured from the height of the upper surface of the bath 1 at that time, and this value is the theoretically necessary lifting height for casting the mold 3. Therefore, the pressure difference Vo between the inside and outside of the chamber necessary to obtain this lift h6 is expressed as vo-σ·ho, where σ is the density of the molten metal.
次表は、所要吸上げ揚程りが４０ｃｍである鋳型に、密
度σが７．８ｇ／ａｊの溶湯をこの減圧吸上鋳造法によ
りチャンバ内外の気圧差Ｖを上記気圧差ｖＯに対する倍
率を種々変えることによって鋳込んだ際の実施例を示し
たものである。ただし鋳込後の減圧状態の保持時間はい
ずれの場合も１０秒間とした。The following table shows how to use this vacuum wick casting method to cast molten metal with a density σ of 7.8 g/aj into a mold with a required suction head of 40 cm by varying the magnification of the pressure difference V inside and outside the chamber with respect to the above pressure difference vO. This figure shows an example of the case of casting. However, the holding time in the reduced pressure state after casting was 10 seconds in all cases.
表 Ｉ
次に所要吸上揚程りが３０ｃｍで、溶湯の密度σが８．
６ｇ／ｃｄである場合について、減圧状態の保持時間を
１５秒とし上記と同様の試験を行なったところその試験
結果は表２のとおりとなった。Table I Next, the required suction head is 30 cm, and the density σ of the molten metal is 8.
In the case of 6 g/cd, the same test as above was conducted with the holding time of the reduced pressure state being 15 seconds, and the test results were as shown in Table 2.
表２
なお、上記実験以外にもさらに異なる揚程の鋳型および
密度の違う溶湯にて鋳込実験を行なったところ、その一
連の実験ではいずれも気圧差Ｖがσ・ｖｏの１．１倍以
上にて欠落のない良好な鋳込状態が得られた。ただし気
圧差ＶＡ（１，５倍以上になると鋳型が破裂する事例が
認められるので気圧差Ｖはσ・ｖｏの１．１倍以上で１
．４倍以下が望ましい
〔発明の効果〕
このように本発明では、溶湯の密度と鋳型の所要吸上揚
程とからその減圧吸上鋳造に必要とするチャンバ内外の
気圧差が計算により求められるので、気圧差の過不足に
原因する鋳込の失敗を解消させる有益な効果がある。Table 2 In addition to the above experiments, we conducted casting experiments using molds with different lift heights and molten metals with different densities, and in all of these series of experiments, the pressure difference V was more than 1.1 times σ vo. A good casting condition with no chipping was obtained. However, the pressure difference V is 1.1 times or more than σ・vo, as there are cases where the mold ruptures when the pressure difference is 1.5 times or more.
．． Desirably 4 times or less [Effects of the Invention] As described above, in the present invention, the pressure difference between the inside and outside of the chamber required for vacuum suction casting is calculated from the density of the molten metal and the required suction head of the mold. It has the beneficial effect of eliminating casting failures caused by excessive or insufficient pressure differences.
図面は本発明の実施例を示したもので、第１図は溶湯吸
上時の鋳型の縦断面図、第２ａ図〜第２Ｃ図は減圧吸上
鋳造の過程を示した縦断面図である。
ｌ・・・湯槽、２・・・チャンバ、３・・・鋳型、８・
・・吸上口、９・・・底部開口、ｌＯ・・・吸気口。
払 パ）。詞
二わ二１、凹The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a mold during suction of molten metal, and FIGS. 2a to 2C are longitudinal sectional views showing the process of vacuum wicking casting. . l...tank, 2...chamber, 3...mold, 8...
...Suction port, 9...Bottom opening, lO...Intake port. payment pa). Words 2wa 21, concave
Claims (1)
ットし、該吸上口を溶湯中に浸漬して該チャンバ内を減
圧することにより溶湯を該チャンバ内外の気圧差で鋳型
内に吸い上げるようにした減圧吸上鋳造法であって、チ
ャンバ内外に溶湯の密度と溶湯の所要吸上揚程との積の
１．１倍〜１．４倍の気圧差を生じさせて溶湯を鋳型内
に吸い上げるようにしたことを特徴とする減圧吸上鋳造
法。A breathable mold with a suction port formed at the lower end is set in a chamber, and the suction port is immersed in the molten metal to reduce the pressure inside the chamber, thereby drawing the molten metal into the mold due to the pressure difference between the inside and outside of the chamber. This is a vacuum wicking casting method in which the molten metal is sucked up into the mold by creating a pressure difference between 1.1 and 1.4 times the product of the density of the molten metal and the required suction head of the molten metal inside and outside the chamber. A vacuum wicking casting method that is characterized by the fact that it is wicked up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17154389A JPH0335861A (en) | 1989-07-03 | 1989-07-03 | Reduced-pressure sucking-up casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17154389A JPH0335861A (en) | 1989-07-03 | 1989-07-03 | Reduced-pressure sucking-up casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0335861A true JPH0335861A (en) | 1991-02-15 |
Family
ID=15925074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17154389A Pending JPH0335861A (en) | 1989-07-03 | 1989-07-03 | Reduced-pressure sucking-up casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0335861A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7175293B2 (en) | 2001-11-02 | 2007-02-13 | 3M Innovative Properties Company | Decorative article and vehicular lamp |
| CN109014134A (en) * | 2017-06-12 | 2018-12-18 | 科华控股股份有限公司 | A kind of heat resisting steel volute shell mould stacked box process for suction casting method |
| CN109865818A (en) * | 2018-03-01 | 2019-06-11 | 北京航大新材科技有限公司 | A kind of locking device of counter-pressure casting machine |
| CN110560665A (en) * | 2019-09-24 | 2019-12-13 | 天锜精密机械(昆山)有限公司 | Stable upper suction shell mold for casting |
-
1989
- 1989-07-03 JP JP17154389A patent/JPH0335861A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7175293B2 (en) | 2001-11-02 | 2007-02-13 | 3M Innovative Properties Company | Decorative article and vehicular lamp |
| CN109014134A (en) * | 2017-06-12 | 2018-12-18 | 科华控股股份有限公司 | A kind of heat resisting steel volute shell mould stacked box process for suction casting method |
| CN109865818A (en) * | 2018-03-01 | 2019-06-11 | 北京航大新材科技有限公司 | A kind of locking device of counter-pressure casting machine |
| CN109865818B (en) * | 2018-03-01 | 2023-11-03 | 诸城航大新材料技术有限公司 | Locking device of differential pressure casting machine |
| CN110560665A (en) * | 2019-09-24 | 2019-12-13 | 天锜精密机械(昆山)有限公司 | Stable upper suction shell mold for casting |
| CN110560665B (en) * | 2019-09-24 | 2021-06-15 | 天锜精密机械(昆山)有限公司 | Stable upper suction shell mold for casting |
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