JPH0386356A - Gas vent for casting - Google Patents
Gas vent for castingInfo
- Publication number
- JPH0386356A JPH0386356A JP1224260A JP22426089A JPH0386356A JP H0386356 A JPH0386356 A JP H0386356A JP 1224260 A JP1224260 A JP 1224260A JP 22426089 A JP22426089 A JP 22426089A JP H0386356 A JPH0386356 A JP H0386356A
- Authority
- JP
- Japan
- Prior art keywords
- gas vent
- molten metal
- cavity
- casting
- gas
- 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 28
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 9
- 230000007547 defect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000013022 venting Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007872 degassing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
この発明は、溶湯鋳込み時に金型のキャビティからガス
抜きを行う鋳造用ガスベントに係り、詳しくは、形状記
憶合金で成形した鋳造用ガスベントに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gas vent for casting that vents gas from a cavity of a mold during pouring of molten metal, and specifically relates to a gas vent for casting formed from a shape memory alloy.
金型鋳造を行う場合、特に細いリプ部や抜は勾配の小さ
いボス部を有する製品を金型鋳造する場合には、湯まわ
り不良の防止を目的として、金型のキャビティから金型
表面に通じる通常その断面が円形のガス扱き溝を設け、
このガス抜き溝に鋳造用ガスベント（ガス抜き用プラグ
）を差し込んで溶湯鋳込み時に金型のキャビティ内の空
気や中子から発生するガスを逃がすようにしている。When performing mold casting, especially when mold casting a product that has a thin lip or a boss with a small draft slope, it is necessary to connect the mold cavity to the mold surface in order to prevent hot water flow failure. Usually, a gas handling groove with a circular cross section is provided,
A casting gas vent (gas venting plug) is inserted into this gas venting groove to allow air in the mold cavity and gas generated from the core to escape when molten metal is poured.
従来より、この種のガスヘントとしては、内側にガス排
出用の多数の孔を設けた円柱形のガスベントや、外周表
面にガス排出用のスリット溝を設けた円柱形のスリント
式ガスベントなどが知られている。Traditionally, this type of gas vent has been known as a cylindrical gas vent with a large number of holes for gas exhaust on the inside, or a cylindrical slint type gas vent with slit grooves on the outer surface for gas exhaust. ing.
しかしながら、上記従来のガスベントにおいては、ガス
抜き性を良くするためにそのガス排出用の孔やスリット
溝などのガス排出部を広くすると、溶湯がこのガス排出
部に入り易くなり、ｔ８９＆がこの部分で凝固してガス
抜き機能が失われてガスベントの寿命が短くなる。However, in the above-mentioned conventional gas vent, if the gas discharge part such as the gas discharge hole or slit groove is widened in order to improve gas venting performance, the molten metal will easily enter this gas discharge part, and t89 & The gas vent will solidify and lose its degassing function, shortening the life of the gas vent.
一方、ガス排出部を逆に狭くすると、溶湯は入り難くは
なるが、ガスが充分に抜けきらず製品中に残存し、製品
中に巣やブローホールなどの欠陥が発生するという欠点
があった。On the other hand, if the gas discharge section is made narrower, it becomes difficult for the molten metal to enter, but there is a drawback that the gas cannot escape sufficiently and remains in the product, causing defects such as cavities and blowholes in the product.
この発明は、上記のような問題点を解決するためになさ
れたものであって、金型のキャビティ内のガス抜きを充
分行えるとともに、溶湯がガス抜き溝との隙間に入らな
いようにし得る鋳造用ガスベントの提供を目的とする。This invention was made in order to solve the above-mentioned problems, and is a casting method that can sufficiently vent the gas in the mold cavity and prevent molten metal from entering the gap between the gas vent groove and the mold cavity. The purpose is to provide gas vents for
上記の目的を達成するために、この発明による鋳造用ガ
スベントは、鋳造用金型のキャビティから導かれたガス
抜き溝に配される鋳造用ガスベントであって、キャビテ
ィへの溶湯の充填に基づく所定温度に加熱されるとガス
抜き溝を塞ぐように変形する形状記憶合金で成形したこ
とを特徴としている。In order to achieve the above object, a casting gas vent according to the present invention is a casting gas vent disposed in a gas venting groove led from a cavity of a casting mold, and the casting gas vent is arranged in a gas vent groove led from a cavity of a casting mold. It is characterized by being molded from a shape memory alloy that deforms to close the gas vent groove when heated.
金型のキャビティへ溶湯が注湯されると、キャビティ内
の空気、ガスはガスベントとガス抜き溝との隙間を通っ
て排出される。そして、キャビティへの溶湯の充填に基
づく所定温度に加熱されると、形状記憶合金で成形され
たガスベントは変形してガス抜き溝が塞がれる。When molten metal is poured into the mold cavity, air and gas within the cavity are exhausted through the gap between the gas vent and the gas vent groove. When the cavity is heated to a predetermined temperature based on the filling of the molten metal, the gas vent formed of the shape memory alloy is deformed and the gas vent groove is closed.
以下、この発明を図面に基づいて説明する。 The present invention will be explained below based on the drawings.
第１図（ａ）及び（ｂ）はこの発明による鋳造用ガスベ
ントの状態説明図である。なお、図示の例では、アルミ
ニウム合金の鋳造に適用されるガスベントについて説明
する。FIGS. 1(a) and 1(b) are state explanatory diagrams of a gas vent for casting according to the present invention. In the illustrated example, a gas vent applied to aluminum alloy casting will be described.
第１図（ａ）は、溶湯の注湯中におけるガスベントの状
態を表す図である。FIG. 1(a) is a diagram showing the state of the gas vent during pouring of molten metal.
同図において、ｌａは上金型、ｉｂは下金型、２は両金
型１ａ、 ｌｂによって形成されるキャビティ、３は上
金型１ａに設けられた円柱状空間を有するガス抜き溝で
あり、キャビティ２から上金型１ａの表面に通じる内径
寸法ａを有し、上金型１ａの表面近くには切欠部３ａが
設けられている。In the figure, la is an upper mold, ib is a lower mold, 2 is a cavity formed by both molds 1a and lb, and 3 is a gas vent groove having a cylindrical space provided in the upper mold 1a. , has an inner diameter dimension a communicating from the cavity 2 to the surface of the upper mold 1a, and a notch 3a is provided near the surface of the upper mold 1a.
このガス抜き満３には、図に示すように、上部側に断面
円形でガス抜き満３の内径寸法ａに対応する外径を有し
、これに連なるキャビティ２側に断面円形で外径寸法ｂ
（ｂ＜ａ）を有する形状記憶合金で成形されたガスベ
ント４が上金型１ａの表面側からその上部側が嵌め込ま
れた状態で配されている。As shown in the figure, this gas vent hole 3 has a circular cross section on the upper side and an outer diameter corresponding to the inner diameter dimension a of the gas vent hole 3, and a cavity 2 side connected to this has a circular cross section and outer diameter dimension. b
A gas vent 4 formed of a shape memory alloy having (b<a) is disposed such that its upper side is fitted from the surface side of the upper mold 1a.
そして、キャビテイ２ヘアルミニウム合金の溶湯が注湯
されると、図に示すように、キャビティ２内の空気、ガ
スはガスベント４とガス抜き溝３との断面積として（ａ
２−ｂ２）・π／４の隙間を通って排出される。なお、
この場合のガスベント４の外径寸法すの値は鋳造方案上
必要な値として定められたものである。Then, when molten aluminum alloy is poured into the cavity 2, the air and gas inside the cavity 2 are poured into the cavity 2, as shown in the figure, as the cross-sectional area of the gas vent 4 and the gas vent groove 3 is
2-b2) · is discharged through a gap of π/4. In addition,
The value of the outer diameter dimension of the gas vent 4 in this case is determined as a value necessary for the casting method.
第１図（ｂ）は、溶湯の充填完了時におけるガスベント
の状態を表す図である。FIG. 1(b) is a diagram showing the state of the gas vent at the time of completion of filling with molten metal.
すなわち、キャビティ２への注湯が進行して溶湯により
ガスベント４が５６０℃以上に加熱されると、同図に示
すように、溶湯に接するガスベント４のキャビティ２側
の先端部が当初設定していた外径寸法ｃ （ｃ＞ａ）に
なろうとして急、激に変形してガス抜き溝３が塞がれる
。これにより、アルミニウム合金溶湯のガス抜き溝３へ
の差し込みを確実に防ぐことができる。なお、ガスベン
ト４を構成する形状記憶合金の変態温度が５６０°Ｃで
あるのは、アルミニウム合金の融点が約６６０℃である
ことからこれより１００ ’Ｃ程度低い温度で変形を開
始さセることから定めた。In other words, as the pouring of metal into the cavity 2 progresses and the gas vent 4 is heated to 560°C or higher by the molten metal, as shown in the figure, the tip of the gas vent 4 on the cavity 2 side that is in contact with the molten metal changes from the initially set position. When the outer diameter dimension c (c>a) is reached, the gas venting groove 3 is suddenly and violently deformed and the gas vent groove 3 is blocked. Thereby, insertion of the molten aluminum alloy into the gas vent groove 3 can be reliably prevented. The transformation temperature of the shape memory alloy constituting the gas vent 4 is 560°C because the melting point of the aluminum alloy is about 660°C, so deformation starts at a temperature about 100°C lower than this. Established from
そして、キャビティ２に充填された溶湯の凝固、冷却に
伴ってガスベント４の温度が５６０℃より下がると、ガ
スベント４は変形前の状態に戻るようになっている。When the temperature of the gas vent 4 falls below 560° C. as the molten metal filled in the cavity 2 solidifies and cools, the gas vent 4 returns to its pre-deformation state.
次にこのようなガスベント４の適用例について説明する
。すなわち、スクロール型圧縮機等の構成部品であるア
ルミニウム合金ＡＣ４Ｃからなるスクロールを低圧鋳造
機で鋳造するに際し、上金型に形成された渦巻体部キャ
ビティから上金型表面に通しるガス抜き溝をこの渦巻体
部に沿って所定の間隔を隔てて設け、このガス抜き溝に
上記のガスベント４をそれぞれ配し、スクロールの鋳造
を行った。Next, an application example of such a gas vent 4 will be explained. That is, when casting a scroll made of aluminum alloy AC4C, which is a component of a scroll compressor, etc., using a low-pressure casting machine, a gas vent groove is formed that passes from the spiral cavity formed in the upper mold to the surface of the upper mold. The scrolls were cast at predetermined intervals along the spiral body, and the gas vents 4 described above were placed in each of the gas vent grooves.
その結果、渦巻体部での湯まわり不良による欠陥発生率
が従来の５％から０．５％に低減されるとともに、ガス
ベントの寿命を従来の３００シヨツトからその１０倍の
３０００シジツトにまで延ばすことができた。また、ガ
ス抜き不良による製品中の巣やブローホールなどの欠陥
も従来より大＝Ｗｉに減少させることができた。As a result, the rate of defects due to poor water flow in the volute body has been reduced from 5% to 0.5%, and the life of the gas vent has been extended from 300 shots to 3,000 shots, 10 times that of the previous model. was completed. In addition, defects such as cavities and blowholes in the product due to poor degassing were reduced to a larger value (Wi) than in the past.
以上説明したように、この発明による鋳造用ガスベント
は、鋳造用金型のキャビティへの溶湯の充填に基づく所
定温度に加熱されるとガス抜き溝を塞ぐように変形する
形状記憶合金で成形したので、キャビティ内のガス抜き
を充分行えるとともに、溶湯のガス抜き溝との隙間への
差し込みを確実に防止することができる。As explained above, the casting gas vent according to the present invention is made of a shape memory alloy that deforms to close the gas vent groove when heated to a predetermined temperature based on filling the cavity of the casting mold with molten metal. In addition, gas in the cavity can be sufficiently vented, and molten metal can be reliably prevented from being inserted into the gap between the gas vent groove and the cavity.
これにより、ガスベントとしての使用寿命を従来より延
長しｉ）るとともに、この発明による鋳造用ガスベント
を金型鋳造に適用することにより、湯まわり不良やガス
抜き不良による鋳造欠陥を従来より大幅に減少させるこ
とができる。As a result, the service life of the gas vent is extended compared to the conventional one, and by applying the gas vent for casting according to the present invention to mold casting, casting defects due to poor hot water supply and degassing are significantly reduced compared to the conventional method. can be done.
第１図（ａ）及び（ｂ）はこの発明による鋳造用ガスベ
ントの状態説明図である。
ｌａ−・上金型、１ｂ−下金型、２−キャビティ、ガス
抜き溝、３ａ・・・ガス抜き溝の切欠部、・・鋳造用ガ
スベント。FIGS. 1(a) and 1(b) are state explanatory diagrams of a gas vent for casting according to the present invention. la--upper mold, 1b-lower mold, 2-cavity, gas vent groove, 3a...notch of gas vent groove,...gas vent for casting.
Claims (1)
に配される鋳造用ガスベントであって、キャビティへの
溶湯の充填に基づく所定温度に加熱されるとガス抜き溝
を塞ぐように変形する形状記憶合金で成形したことを特
徴とする鋳造用ガスベント。(1) A casting gas vent placed in a gas vent groove led from the cavity of a casting mold, which deforms to block the gas vent groove when heated to a predetermined temperature based on filling the cavity with molten metal. A gas vent for casting, characterized by being molded from a shape memory alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1224260A JPH0386356A (en) | 1989-08-29 | 1989-08-29 | Gas vent for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1224260A JPH0386356A (en) | 1989-08-29 | 1989-08-29 | Gas vent for casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0386356A true JPH0386356A (en) | 1991-04-11 |
Family
ID=16810989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1224260A Pending JPH0386356A (en) | 1989-08-29 | 1989-08-29 | Gas vent for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0386356A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120018112A1 (en) * | 2009-03-27 | 2012-01-26 | Beng Wah Chua | Method and apparatus for forming a liquid-forged article |
-
1989
- 1989-08-29 JP JP1224260A patent/JPH0386356A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120018112A1 (en) * | 2009-03-27 | 2012-01-26 | Beng Wah Chua | Method and apparatus for forming a liquid-forged article |
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