JPS62168655A - Suction type precision casting method - Google Patents
Suction type precision casting methodInfo
- Publication number
- JPS62168655A JPS62168655A JP874686A JP874686A JPS62168655A JP S62168655 A JPS62168655 A JP S62168655A JP 874686 A JP874686 A JP 874686A JP 874686 A JP874686 A JP 874686A JP S62168655 A JPS62168655 A JP S62168655A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- molten metal
- chamber
- mold
- film
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000005495 investment casting Methods 0.000 title claims description 8
- 238000005266 casting Methods 0.000 claims abstract description 77
- 239000002184 metal Substances 0.000 claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000012528 membrane Substances 0.000 claims description 27
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 abstract description 32
- 230000008018 melting Effects 0.000 abstract description 32
- 239000012768 molten material Substances 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract description 5
- 239000006260 foam Substances 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 16
- 239000007789 gas Substances 0.000 description 14
- 229910052786 argon Inorganic materials 0.000 description 8
- 238000010891 electric arc Methods 0.000 description 7
- 239000011261 inert gas Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 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、金属性の身装具・工芸品・義歯工業用小物な
どを精密に鋳造する方法に関し、薄くて広い形や、細く
て長い形の細部までをも正確に美しく鋳造できるように
した鋳造方法に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for precisely casting metal personal accessories, crafts, denture industrial accessories, etc. It relates to a casting method that allows even the smallest detail to be accurately and beautifully cast.
く従来技術〉
精密鋳造においては、溶融した材料の鋳込み温度及び鋳
込みタイミングが特にシビャーに要求される６即ち、溶
湯の鋳込みに適正な温度範囲が狭く、これを越えると過
熱ぎみとなって、酸化・窒化・肌荒れ・気泡などが生じ
、逆に、それに満たなけれ、ば加熱不足で湯回りが悪く
なり、薄くて広い形や細くて長い形の部分にまで充分に
流れ込まない。Prior Art In precision casting, the casting temperature and casting timing of the molten material are particularly required6.In other words, the appropriate temperature range for casting the molten metal is narrow, and if it exceeds this, it will overheat and cause oxidation.・Nitriding, rough skin, bubbles, etc. will occur, and on the other hand, if these conditions are not met, the water will not flow properly due to insufficient heating, and will not flow sufficiently into thin, wide or thin and long parts.
また、鋳型への溶湯の流し込みが途切れたり、流れ込み
速度が遅かつハリすると、溶湯が流れ込みの途中で凝固
し始め、正しい形に鋳造できない。Furthermore, if the flow of the molten metal into the mold is interrupted, or if the flow rate is slow and firm, the molten metal will begin to solidify midway through the flow, making it impossible to cast into the correct shape.
そこで、」−記のような難点を解消するものとして、従
来より溶解室とその下側に配設した鋳込室との間に、気
密膜を介在させて鋳込室を真空引きして、溶湯の湯主わ
りを速やかに正しく鋳造するようにした方法が知られて
いる。Therefore, in order to solve the problems mentioned above, an airtight membrane is interposed between the melting chamber and the casting chamber located below it, and the casting chamber is evacuated. A method is known in which the main portion of molten metal is cast quickly and correctly.
それは、鋳造装置内に鋳込室を形成し、鋳込室の上壁に
鋳込孔をあけ、鋳込室内で通気性の鋳型の湯口の周内壁
上面を気密膜を介して鋳込孔の周内壁上面に気密状に接
当し、鋳込室を真空引きし、溶湯を鋳込孔から注湯して
気密膜を破封し、鋳型の湯口から造形空洞に吸引させる
ようにした方法である。この場合、気密膜は金属材料で
形成されていた。A casting chamber is formed in the casting equipment, a casting hole is made in the upper wall of the casting chamber, and the upper surface of the peripheral inner wall of the sprue of the air-permeable mold is passed through an airtight membrane into the casting hole. This is a method in which the mold is brought into airtight contact with the upper surface of the inner peripheral wall, the casting chamber is evacuated, the molten metal is poured through the casting hole to break the airtight membrane, and the mold is sucked into the molding cavity through the sprue of the mold. be. In this case, the airtight membrane was formed of a metal material.
〈発明が解決しようとする問題点〉
しかし上記従来方法では、気密膜が金属材料で形成され
ているため、溶湯がその熱により気密膜を破封する際に
無視し得ないほどに熱をうばわれで冷え、適正な鋳込み
温度を維持することができないため、鋳込み不良の原因
になることがある。<Problems to be Solved by the Invention> However, in the conventional method described above, since the airtight membrane is formed of a metal material, when the molten metal breaks the airtight membrane with its heat, it generates a non-negligible amount of heat. This may cause casting failures as the mold gets cold and cannot maintain the proper casting temperature.
また、金属製の気密膜が破封されるまでの間、溶湯の落
下が抵抗を受けることになるため、湯口への落下速度が
弱まり、造形空洞への湯まわりを速やかにする上で難点
があった。In addition, until the metal airtight membrane is broken, the falling molten metal encounters resistance, which slows down the rate at which the molten metal falls into the sprue, making it difficult to quickly circulate the molten metal into the modeling cavity. there were.
その上、気密膜を形成する金属が溶融すると、当該溶湯
の成分を異種合金に変質させることがあり、この場合に
は本来の鋳造装置そのものの価値を失わしめることとな
る。Moreover, when the metal forming the airtight film melts, the components of the molten metal may change into a different alloy, and in this case, the original value of the casting apparatus itself is lost.
く問題点を解決するための手段〉
本発明はこの上）な問題点を解消するために、上記従来
技術を次のように改良したものである。Means for Solving the Problems> In order to solve the above problems, the present invention improves the above-mentioned prior art as follows.
即ち、気密膜を可燃性材料で造り、注湯時に溶湯の熱で
気密膜を燃焼させて破封する事を特徴とする方法である
。That is, this method is characterized in that an airtight membrane is made of a combustible material, and the airtight membrane is combusted and sealed by the heat of the molten metal during pouring.
く作用及び効果〉
鋳込み材料３５がるつぼ１３内で完全に溶融した状態で
鋳込み工程＋’＝移行するが、このとき、その溶湯３５
ａはその全部が一丸となって鋳込孔１２を通り、気密膜
１５をその溶湯３５ａの熱で瞬時に燃焼して破封し、湯
口２２から造形空洞２３内に速やかに鋳込まれる。Functions and Effects> The casting material 35 is completely melted in the crucible 13 during the casting process +'=, but at this time, the molten metal 35
All of the molten metal 35a passes through the casting hole 12, the airtight membrane 15 is instantly combusted and sealed by the heat of the molten metal 35a, and the molten metal 35a is quickly cast into the molding cavity 23 through the sprue 22.
即ち、気密膜１５は可燃性材料で形成されており、溶湯
３５ａがこの気密膜１５を燃焼して破封する際に損失す
る熱量は軽微かつ無視し得るもので、従来例のような鋳
込み温度の低下による鋳込み不良を解消することができ
る。しかも、気密膜１５は一瞬に破封されるので、落下
の際にはとんと抵抗を受けることがなく造形空洞２３へ
の速かな湯まわりを促進させることができる。また、気
密膜」５は金属材料ではないので、燃焼の際に溶湯３５
ａの成分が従来例のように異種合金に変質することもな
い。That is, the airtight membrane 15 is formed of a combustible material, and the amount of heat lost when the molten metal 35a burns the airtight membrane 15 and breaks the seal is slight and can be ignored, and the casting temperature as in the conventional example is low. It is possible to eliminate poor casting caused by a decrease in In addition, since the airtight membrane 15 is broken in an instant, the water does not encounter any resistance when dropped, and the hot water quickly flows into the modeling cavity 23. In addition, since the airtight membrane 5 is not made of metal material, the molten metal 35
The component a does not change into a different type of alloy as in the conventional example.
従って溶融材料は、常に適温でタイミング良く鋳込まれ
るから、温度不足による湯回りの悪化もなければ、過熱
による気泡や肌荒れ等の発生もなく、身装品・工芸品・
義歯などに多く見うけられる薄くて広い形や細くて長い
形の部分でも、隔隔まで正確に美しく、しかも滑らかな
肌に精密に鋳造する事がで外る。Therefore, the molten material is always cast at the right temperature and in a timely manner, so there is no deterioration in the flow of the hot water due to insufficient temperature, and there is no occurrence of bubbles or rough skin due to overheating.
Even thin, wide or thin and long parts that are often found in dentures can be precisely cast to create beautiful, smooth skin down to the septum.
〈実 施 例〉
以下、本発明の精密鋳造装置の実施例を、図面に基づい
て説明する。<Example> Hereinafter, an example of the precision casting apparatus of the present invention will be described based on the drawings.
第１図は本発明に係る鋳造装置の縦断面図、第２図はそ
の斜視図である。FIG. 1 is a longitudinal sectional view of a casting apparatus according to the present invention, and FIG. 2 is a perspective view thereof.
図中、符号１は鋳造装置全体を示し、１ａは密閉に形成
された溶解室であり、その下側に密閉に形成された鋳込
室２が配置される。溶解室１ａは密閉状の溶解ケース３
内に形成され、その横側面に開設された操作口４は蓋５
で密閉に閉じられる。In the figure, reference numeral 1 indicates the entire casting apparatus, 1a is a hermetically formed melting chamber, and a hermetically formed casting chamber 2 is disposed below the melting chamber. The melting chamber 1a is a closed melting case 3.
An operation port 4 formed inside and opened on the side surface of the lid 5
Closed tightly.
鋳込室２は上面開口状の鋳込みケース６内に形成され、
連結ボルト７・高さ調節ナツト８・揺動式係止腕９によ
り、鋳込みケース６が溶解ケース３に圧接されて、鋳込
室２がシールリング１０で密閉に保たれる。係止腕９を
水平に回転させてナツト８から離脱させると、鋳込みケ
ース６を溶解ケース３から取外して、鋳込室２の上面を
開放できる。溶解ケース３の底壁１１の中央部に鋳込孔
１２が明けられる。The casting chamber 2 is formed in a casting case 6 with an open top surface,
The casting case 6 is pressed against the melting case 3 by the connecting bolt 7, the height adjustment nut 8, and the swing type locking arm 9, and the casting chamber 2 is kept hermetically sealed by the seal ring 10. When the locking arm 9 is rotated horizontally and removed from the nut 8, the casting case 6 can be removed from the melting case 3 and the upper surface of the casting chamber 2 can be opened. A casting hole 12 is formed in the center of the bottom wall 11 of the melting case 3.
溶解室１ａ内の底壁１１上にるっば１３が載置され、鋳
込室２内の土壁（即ち上記底壁）１１の下側に鋳型１４
が配置されて気密膜１５で気密接当される。A rubber 13 is placed on the bottom wall 11 in the melting chamber 1a, and a mold 14 is placed below the earthen wall (i.e., the bottom wall) 11 in the casting chamber 2.
are placed in airtight contact with each other by an airtight film 15.
そして、この鋳型１４は受台１６と高さ調節ボルト１７
を介して鋳込みケース６で支持される。This mold 14 includes a pedestal 16 and a height adjustment bolt 17.
It is supported by the cast case 6 via.
つるぼ１３は銅又は銅合金で円盤形に形成され、その中
央部に溶室１８がすり鉢形に形成され、その底部に溶湯
通過孔１９が明けられ、この溶湯通通孔１９の周囲を取
囲む形で溶室１８の底部に材料受は而２０が扁平に形成
され、溶室１８の壁面」−１こカーボンやグラファイト
等の耐熱断熱絶縁性を有する材料で保熱表層４９が形成
される。The crucible 13 is made of copper or copper alloy and is formed into a disk shape, with a mortar-shaped melt chamber 18 formed in the center thereof, and a molten metal passage hole 19 formed at the bottom of the crucible 13 , and a molten metal passage hole 19 surrounding the crucible 13 . A flat material receptacle 20 is formed at the bottom of the melting chamber 18, and a heat retaining surface layer 49 is formed on the wall surface of the melting chamber 18 from a heat-resistant heat-insulating material such as carbon or graphite.
前記気密膜」５は、例えばセロファン紙等の可燃性材料
で形成され、銅板等で形成された上下−組の挟持部材１
５ａ・１５ｂで挟持される。The airtight membrane 5 is made of a combustible material such as cellophane paper, and the upper and lower clamping members 1 are made of a copper plate or the like.
It is held between 5a and 15b.
鋳型１４は義歯用であり、鉄製筒枠２１内に石膏と砂と
からなる形材２１ａが形成され、この形材２１ａ内に湯
口２２及び造形空洞２３が連通して形成される。The mold 14 is for a denture, and a shape member 21a made of gypsum and sand is formed in an iron cylinder frame 21, and a sprue 22 and a modeling cavity 23 are formed in communication with each other in the shape member 21a.
そして、造形空洞２３は形材２１ａの粒子間隙で形成さ
れるガス抜き路・及び受台１６に設けられた多数のガス
抜き孔１６ａを順に経で鋳込室２に連通される。The molding cavity 23 is communicated with the casting chamber 2 through a gas vent path formed by the interparticle gaps of the shape material 21a and a large number of gas vent holes 16a provided in the pedestal 16 in order.
溶解室１ａの上面の一側部に圧力不活性ガス注入口２５
Ａが明けられ、この注入口２５Ａが開閉弁２６Ａを介し
て不活性ガスの一種であるアルゴンガスの容器２７に接
続される。溶解室１ａの一側下部に真空引す口２８が明
けられ、この真空引トロ２８が開閉弁２９ａを介して真
空ポンプ３０に接続される。A pressure inert gas inlet 25 is provided on one side of the upper surface of the melting chamber 1a.
A is opened, and this injection port 25A is connected to a container 27 for argon gas, which is a type of inert gas, via an on-off valve 26A. A vacuum port 28 is provided at the bottom of one side of the melting chamber 1a, and the vacuum drawer 28 is connected to a vacuum pump 30 via an on-off valve 29a.
鋳込室２の下部に圧力不活性ガス注入口２５Ｂが明けら
れ、この注入口２５Ｂが開閉弁２６Ｂを介して前記アル
ゴンガスの容器２７に接続される。A pressure inert gas inlet 25B is opened in the lower part of the casting chamber 2, and this inert gas inlet 25B is connected to the argon gas container 27 via an on-off valve 26B.
鋳込室２の上面の一側部に不活性ガス排出口３１が明け
られ、この排出口３１が絞り調節用の弁３２及び開閉弁
２９ｂを経て真空ポンプ３０に接続される。An inert gas discharge port 31 is provided on one side of the upper surface of the casting chamber 2, and this discharge port 31 is connected to a vacuum pump 30 via a throttle adjustment valve 32 and an on-off valve 29b.
っるぼ１３の溶室１８の底部に形成した材料受は面２０
上に円柱形の単体の鋳込み材料３５が立てて置かれ、こ
の材料３５の底部で溶湯通過孔１９がほぼ塞がれる。溶
解室１ａ内で、材料３５のＪ−側にタングステン製のア
ーク放電電極３６が適当間隔距でて配ｒｆｔされ、この
アーク放電電極３Ｇと材料３５とに亘って電源３７から
直流電圧又は交流電圧が電圧調節器３８・昇圧器３９・
溶解ケース３・及びるつば１３を経て印加されるように
構成される。アーク放電電極３６は、高さ調節ネジ４０
で高さ調節可能に、溶解ケース３に固定される。なお符
号４１はのぞき窓である。The material receptacle formed at the bottom of the solution chamber 18 of the Kurubo 13 is the surface 20.
A single cylindrical casting material 35 is placed upright on top, and the molten metal passage hole 19 is substantially closed at the bottom of this material 35. In the melting chamber 1a, tungsten arc discharge electrodes 36 are arranged at appropriate intervals on the J- side of the material 35, and a DC or AC voltage is applied from a power source 37 across the arc discharge electrodes 3G and the material 35. is the voltage regulator 38, booster 39,
It is configured to be applied via the melting case 3 and the crucible collar 13. The arc discharge electrode 36 has a height adjustment screw 40
It is fixed to the melting case 3 so that its height can be adjusted. Note that the reference numeral 41 is a peephole.
次に、上記構成の精密鋳造装置を用いて、本発明の精密
鋳造方法の実施手順の一例を説明する。Next, an example of the procedure for carrying out the precision casting method of the present invention will be explained using the precision casting apparatus having the above configuration.
この精密鋳造方法は、■不活性雰囲気形成工程、■雰囲
気圧力形成工程、■材料溶解］ニ程、及び■鋳込み工程
の順から成る。This precision casting method consists of (1) an inert atmosphere forming step, (2) an atmosphere pressure forming step, (2) a material melting step, and (2) a casting step.
■ 不活性雰囲気形成工程では、材料３５の酸化及び窒
化を防ぐために、溶解室１ａ及び鋳込室２を不活性雰囲
気にする。即ち、開閉弁２９ａ・２９ｂを開ぎ、真空ポ
ンプ３０を作動させると、溶解室１ａ及び鋳込室２が真
空にされる。十分に真空になったところで開閉弁２９ａ
・２９１〕を閉じ真空ポンプ３０を停止する。(2) In the inert atmosphere forming step, in order to prevent oxidation and nitridation of the material 35, the melting chamber 1a and the casting chamber 2 are made into an inert atmosphere. That is, when the on-off valves 29a and 29b are opened and the vacuum pump 30 is operated, the melting chamber 1a and the casting chamber 2 are evacuated. When the vacuum is sufficient, open/close valve 29a
291] and stop the vacuum pump 30.
次いで、開閉弁２６Ａ・２６Ｂを開き、アルゴンガス容
器２７から、アルゴンガスな溶解室１ａ及び鋳込室２に
注入する。気密膜１５の上側ではアルゴンガスが溶解室
１ａから、材料３５とるつぼ１３の材料受面２０との隙
間、るつぼ１３と下壁１１との隙間、鋳込孔１２に入り
込む。気密膜１５の下側ではアルゴンガスが鋳込室２か
ら、ガス抜き孔１．６ａ、形材２１ａの粒子間隙から成
るガス抜ト路、造形空洞２３、湯口２２に入り込む。Next, the on-off valves 26A and 26B are opened, and argon gas is injected into the melting chamber 1a and the casting chamber 2 from the argon gas container 27. Above the airtight membrane 15, argon gas enters the gap between the material 35 and the material receiving surface 20 of the crucible 13, the gap between the crucible 13 and the lower wall 11, and the casting hole 12 from the melting chamber 1a. Under the airtight membrane 15, argon gas enters from the casting chamber 2 into the gas vent hole 1.6a, the gas vent path formed by the particle gaps of the profile 21a, the modeling cavity 23, and the sprue 22.
」二記真空引トとアルゴンガス注入の操作を必要に応じ
て数回繰り返えすことにより、溶解室１ａ・鋳型１４内
・及び鋳込室２がアルゴンガスで不活性雰囲気に保たれ
る。2. By repeating the vacuum evacuation and argon gas injection several times as necessary, the melting chamber 1a, the inside of the mold 14, and the casting chamber 2 are maintained in an inert atmosphere with argon gas.
■ 雰囲気圧力形成工程、溶融した材料の鋳込みに適正
な温度範囲を拡げ、かつ溶融材料の鋳込み速度を適正に
するために、溶解室１ａ内を加圧状態にするとともに、
鋳込室２及び鋳型１４内を負圧にして、その差圧を２〜
３気圧に保つ。即ち、開閉弁２６Ａを閣外、２９ａは閉
じて溶解室１ａを加圧状態にするとともに、開閉弁２６
Ｂを閉じて２９１〕を開き鋳込室２を負圧状態にする。■ Atmospheric pressure forming step: In order to expand the temperature range appropriate for casting the molten material and to make the casting speed of the molten material appropriate, the inside of the melting chamber 1a is pressurized, and
The inside of the casting chamber 2 and the mold 14 are made negative pressure, and the differential pressure is 2~
Maintain the pressure at 3 atmospheres. That is, the on-off valve 26A is closed, the on-off valve 29a is closed to pressurize the melting chamber 1a, and the on-off valve 26 is closed.
B is closed and 291] is opened to bring the casting chamber 2 into a negative pressure state.
この状態は、鋳込みが完了するまで継続する。This state continues until the casting is completed.
■ 次に、材料溶解工程に入る。即ち、アーク放電電極
３６と材料３５との間に所定値の電圧を印加して、アー
ク放電を起こさせると、このアーク放電の熱で、材料３
５がその」二端部からその底部に向って＊第に溶解され
て流れ落ち、るつぼ１３の溶室１８に受は溜められて、
保熱表層４ｐで保熱される。このと外、材料３５が上か
ら順に溶解される事と、材料３５の底部の熱量がるっぽ
１３に吸収される事か呟その材料底部が最後まで溶は残
り、材料底部で溶湯通過孔１９が塞ぎ続けられる。溶解
された材料３５ａは、溶解室１ａ内の加圧力でその沸点
が高められて、沸騰が、抑止され続ける。■ Next, the material melting process begins. That is, when a predetermined voltage is applied between the arc discharge electrode 36 and the material 35 to cause arc discharge, the heat of this arc discharge causes the material 3 to
5 is first melted and flows down from its two ends toward its bottom, and is stored in the solution chamber 18 of the crucible 13.
Heat is retained by the heat retaining surface layer 4p. In addition, the material 35 is melted in order from the top, and the heat at the bottom of the material 35 is absorbed by the Luppo 13.The melt remains until the bottom of the material reaches the end, and the molten metal passage hole 19 continues to be blocked. The boiling point of the melted material 35a is raised by the pressurizing force in the melting chamber 1a, and boiling is continued to be suppressed.
材料３５がその上部から底部まで完全に溶解してるつぼ
１３内に流れ落ちた状態に至ると、アーク放電が放電限
界値に達して途切れて自動停止する。これにより、完全
に溶融した材料３５ａは鋳込みに適正な温度範囲内に自
動的に入る。このとき、溶湯３５ａでの溶湯通過孔１９
の閉塞が解かれて、鋳込み工程に自動的に移行する。When the material 35 is completely melted from the top to the bottom and flows down into the crucible 13, the arc discharge reaches the discharge limit value and is interrupted to automatically stop. This automatically brings the fully molten material 35a within the proper temperature range for casting. At this time, the molten metal passage hole 19 in the molten metal 35a
The blockage will be released and the process will automatically proceed to the casting process.
その材料３５ａがニッケル合金・クロム合金・コバルト
合金・又はチタン合金などの高融点（約１４００〜１９
００℃）の場合でも、るつぼ１３は銅乃至調合金製の低
融点（約１１００℃）ではあるが、熱伝導性が高くて熱
を速やかに拡算させて低温に保たれるか呟その溶湯３５
ａでるっぽ１３が溶損される事はない。The material 35a is made of a material with a high melting point (approximately 1400 to 19
00°C), the crucible 13 is made of copper or a metal alloy with a low melting point (approximately 1100°C), but has high thermal conductivity and can spread the heat quickly and keep the molten metal at a low temperature. 35
A Derupo 13 will not be damaged by melting.
■ 鋳込み工程では、るつぼ１３内の溶湯３５ａが適正
な温度範囲内に保たれながら、その全部が一丸となって
、溶湯通過孔１９を通り抜け、鋳込孔１２を通って、気
密膜１５をその溶湯３Ｓａの熱で瞬時に燃焼して破封し
、湯口２２から造形空洞２３内に鋳込まれる。このとき
、溶湯３５ａは溶解室１ａの加圧力で加圧され、その沸
騰を抑止され続ける。■ In the casting process, the molten metal 35a in the crucible 13 is kept within an appropriate temperature range, and all of it passes through the molten metal passage hole 19, passes through the casting hole 12, and then seals the airtight membrane 15. The heat of the molten metal 3Sa instantly burns and breaks the seal, and the molten metal 3Sa is cast into the modeling cavity 23 through the sprue 22. At this time, the molten metal 35a is pressurized by the pressure of the melting chamber 1a, and its boiling is continued to be suppressed.
また、溶湯３５ａは溶解室１ａの加圧力と、気密膜１５
の破封に伴なう鋳込室２の負圧とによって、鋳込み速度
を加速し、適正な速度で造形空洞２３内に鋳込まれる。In addition, the molten metal 35a is heated by the pressure of the melting chamber 1a and the airtight membrane 15.
The casting speed is accelerated by the negative pressure in the casting chamber 2 caused by the breaking of the seal, and the casting is cast into the modeling cavity 23 at an appropriate speed.
このとき鋳込室２が真空引トしであるため、通気性の形
材２１ａ内に発生するガスは鋳型１４の外に向けて瞬時
に吸引排出され、しかも造形空洞２３内に鋳込まれた溶
湯３５ａは速やかに冷却固型化する。At this time, since the casting chamber 2 is evacuated, the gas generated in the air-permeable profile 21a is instantly suctioned and discharged to the outside of the mold 14, and moreover, the gas generated in the air-permeable shape member 21a is instantly sucked and discharged to the outside of the mold 14. The molten metal 35a is rapidly cooled and solidified.
第３図は気密膜１５の形状を鋳型１４の湯０．２２に沿
わせて形成した別実施例を示し、これによリ、鋳込みの
際の空気の混入を最小限にとどめ、造形空洞２３のすみ
ずみまで速やかに溶湯が社外わたるようにするので効果
的である。FIG. 3 shows another embodiment in which the shape of the airtight membrane 15 is formed along the molten metal 0.22 mm of the mold 14, which also minimizes the intrusion of air during casting. This is effective because it allows the molten metal to quickly reach every corner of the building.
第１図は本発明に係る吸引式構造装置の縦断面図、第２
図はその外観斜視図、第３図は気密膜の別実施例を示す
要部断面図である。
１・・・鋳造装置、 ２・・・鋳込室、 １１・・・鋳
込室の上壁、 １２・・・鋳込孔、 １２ａ・・・鋳
込孔の周肉壁下面、 １４・・・鋳型、 １５・・・
気密膜、２２・・・湯口、 ２２ａ・・・湯口の周肉壁
上面、３５・・・鋳込材料、 ３５ａ・・・溶湯。Fig. 1 is a vertical sectional view of the suction type structure device according to the present invention, Fig.
The figure is a perspective view of the external appearance, and FIG. 3 is a sectional view of a main part showing another embodiment of the airtight membrane. DESCRIPTION OF SYMBOLS 1... Casting device, 2... Casting chamber, 11... Upper wall of casting chamber, 12... Casting hole, 12a... Lower surface of peripheral wall of casting hole, 14...・Mold, 15...
Airtight membrane, 22... Sprue, 22a... Upper surface of peripheral wall of sprue, 35... Casting material, 35a... Molten metal.
Claims (1)
１１に鋳込孔１２をあけ、鋳込室２内で通気性の鋳型１
４の湯口２２の周肉壁上面２２ａを気密膜１５を介して
鋳込孔１２の周肉壁下面１２ａに気密状に接当し、鋳込
室２を真空引きし、溶湯３５ａを鋳込孔１２から注湯し
て気密膜１５を破封し、鋳型１４の湯口２２から造形空
洞２３に吸引させるようにした吸引式精密鋳造方法にお
いて、気密膜１５を可燃性材料で造り、注湯時に溶湯３
５ａの熱で気密膜１５を燃焼させて破封する事を特徴と
する吸引式精密鋳造方法1. A casting chamber 2 is formed in the casting apparatus 1, a casting hole 12 is formed in the upper wall 11 of the casting chamber 2, and an air-permeable mold 1 is formed in the casting chamber 2.
The upper surface 22a of the peripheral wall of the sprue 22 of No. 4 is brought into airtight contact with the lower surface 12a of the peripheral wall of the casting hole 12 through the airtight membrane 15, the casting chamber 2 is evacuated, and the molten metal 35a is poured into the casting hole. In the suction type precision casting method, the airtight membrane 15 is broken by pouring metal from the mold 12 and the airtight membrane 15 is sucked into the modeling cavity 23 from the sprue 22 of the mold 14.The airtight membrane 15 is made of a flammable material and the molten metal is 3
A suction type precision casting method characterized by burning and breaking the airtight membrane 15 with the heat of 5a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP874686A JPH0628793B2 (en) | 1986-01-18 | 1986-01-18 | Suction type precision casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP874686A JPH0628793B2 (en) | 1986-01-18 | 1986-01-18 | Suction type precision casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62168655A true JPS62168655A (en) | 1987-07-24 |
| JPH0628793B2 JPH0628793B2 (en) | 1994-04-20 |
Family
ID=11701496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP874686A Expired - Lifetime JPH0628793B2 (en) | 1986-01-18 | 1986-01-18 | Suction type precision casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0628793B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07256434A (en) * | 1994-03-22 | 1995-10-09 | Iwatani Internatl Corp | Precision casting method for titanium product and precision casting apparatus therefor |
| CN102225462A (en) * | 2011-02-23 | 2011-10-26 | 谭哲豪 | Vacuum casting method for sealing feed port by adopting foam plastic |
-
1986
- 1986-01-18 JP JP874686A patent/JPH0628793B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07256434A (en) * | 1994-03-22 | 1995-10-09 | Iwatani Internatl Corp | Precision casting method for titanium product and precision casting apparatus therefor |
| CN102225462A (en) * | 2011-02-23 | 2011-10-26 | 谭哲豪 | Vacuum casting method for sealing feed port by adopting foam plastic |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0628793B2 (en) | 1994-04-20 |
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