JPH0444293Y2 - - Google Patents

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Publication number
JPH0444293Y2
JPH0444293Y2 JP1988021264U JP2126488U JPH0444293Y2 JP H0444293 Y2 JPH0444293 Y2 JP H0444293Y2 JP 1988021264 U JP1988021264 U JP 1988021264U JP 2126488 U JP2126488 U JP 2126488U JP H0444293 Y2 JPH0444293 Y2 JP H0444293Y2
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JP
Japan
Prior art keywords
ring
casting
investment material
casting mold
mold
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
Application number
JP1988021264U
Other languages
Japanese (ja)
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JPH01128936U (en
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Filing date
Publication date
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Priority to JP1988021264U priority Critical patent/JPH0444293Y2/ja
Publication of JPH01128936U publication Critical patent/JPH01128936U/ja
Application granted granted Critical
Publication of JPH0444293Y2 publication Critical patent/JPH0444293Y2/ja
Expired legal-status Critical Current

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Description

【考案の詳細な説明】 〔考案の目的〕 (産業上の利用分野〕 本考案は、鋳造用鋳型に使用されるリングに関
する。更に詳しくは、本考案は鋳造用鋳型の埋没
材に周設されるリングにおいて、鋳造作業中に該
埋没材を落下させないような構造をもつリングに
関するものである。
[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a ring used in a casting mold. The present invention relates to a ring having a structure that prevents the investment material from falling during the casting operation.

(従来技術とその問題点) 従来、鋳造用鋳型の製作において、埋没材の周
囲には、金属やガラスの溶融物の注湯時における
埋没材の膨張破壊の防止、メルトダウンによる危
険防止などのために金属リングが周設される。
(Prior art and its problems) Conventionally, in the production of casting molds, the surroundings of the investment material were designed to prevent expansion and destruction of the investment material during pouring of molten metal or glass, and to prevent dangers due to meltdown. A metal ring is provided around the periphery.

前記金属リングを用いて鋳造用鋳型を製作する
とき、具体的には金属リングを保持台に固定し、
埋没材を流入・硬化させたのち、保持台を取り外
すとき、鋳型を焼成するとき、焼成鋳型を鋳造機
にセツトするときなど、金属リング内から埋没材
が抜けたり落下したりして、その作業が煩雑であ
る。特に焼成鋳型からの高温埋没材の落下は危険
である。
When manufacturing a casting mold using the metal ring, specifically, the metal ring is fixed to a holding stand,
After the investment material has flowed in and hardened, when removing the holding base, firing the mold, and setting the fired mold into the casting machine, the investment material may fall out or fall from inside the metal ring, resulting in the work being interrupted. is complicated. In particular, falling high-temperature investment materials from fired molds is dangerous.

鋳型のセツト後の埋没材の落下等はあるが、注
湯後が金属リングの高温下での劣化が大きな問題
となる。例えば、結晶化ガラスを鋳造して人工歯
牙、人工歯冠などの歯科用鋳造品を製作する場
合、鋳型を焼く850℃で30分以上焼成し、それに
1000数百度の湯を注湯成形(キヤスト)し、その
後結晶化炉に写し数百度(500〜950℃)に加熱処
理して結晶を析出させているが、結晶化ガラスの
キヤスト工程においては、結晶化処理を含めると
相当な長時間を要する(通常鋳型焼成に30分、キ
ヤストに30分、結晶化処理に約5時間を要す。)。
このように長時間、高温下にされされると、金属
リングは熱劣化、酸化劣化をおこし、鋳型の強度
低下は勿論のこと、結晶化ガラス系の人工歯に劣
化物である金属酸化物などの異物が混入し鋳造欠
陥が多発する。即ち、リングの使用回数に制限を
うけたり、人工歯に赤サビなどが混入して製品欠
陥が多くなり歩留りを悪化させる。
Although there are cases where the investment material falls after the mold is set, the major problem is the deterioration of the metal ring at high temperatures after pouring. For example, when casting crystallized glass to produce dental castings such as artificial teeth and crowns, the mold is baked at 850°C for more than 30 minutes, and then
In the casting process for crystallized glass, hot water at a temperature of several hundred degrees is poured and formed (cast), and then transferred to a crystallization furnace and heated to several hundred degrees (500 to 950 degrees Celsius) to precipitate crystals. Including the crystallization process, it takes a considerable amount of time (usually 30 minutes for mold firing, 30 minutes for casting, and about 5 hours for crystallization process).
If the metal ring is exposed to high temperatures for a long period of time, it will undergo thermal deterioration and oxidative deterioration, which will not only reduce the strength of the mold, but also cause metal oxides to form on the crystallized glass-based artificial teeth. Foreign matter gets mixed in and casting defects occur frequently. That is, the number of times the ring can be used is limited, and the artificial teeth are contaminated with red rust, resulting in more product defects and lower yields.

(考案が解決しようとする問題点) 本考案者は、従来の前記した鋳造用鋳型の金属
リングの欠点を改良すべく鋭意、検討した結果、
リングにテーパーなどの埋没材の落下防止手段を
講じるとともに、リングの素材を耐酸化制御のス
テンレス鋼からなる金属あるいはセラミツクにす
ることが極めて有効であることを見い出し、本考
案を完成するに至つた。
(Problems to be solved by the invention) As a result of intensive study to improve the drawbacks of the conventional metal ring of the above-mentioned casting mold, the inventor of the present invention found that
We discovered that it is extremely effective to take measures to prevent investment materials from falling, such as tapers on the ring, and to use oxidation-resistant stainless steel metal or ceramic as the material for the ring, leading to the completion of this invention. .

〔考案の構成〕[Structure of the idea]

(問題点を解決するための手段) 本考案を概説すれば、本考案は、 鋳造用鋳型の埋没材に周設するリングにおい
て、前記リングが埋没材の落下を防止できる構造
であるとともに、耐酸化性に優れた金属あるいは
セラミツクで製作されたものであることを特徴と
する鋳造用鋳型のリングに関するものである。
(Means for Solving the Problems) To summarize the present invention, the present invention provides a ring that is provided around the investment material of a casting mold, the ring has a structure that can prevent the investment material from falling, and is acid-resistant. The present invention relates to a ring for a casting mold, characterized in that it is made of metal or ceramic with excellent chemical properties.

以下、本考案の構成を図面に基づいて詳しく説
明する。
Hereinafter, the configuration of the present invention will be explained in detail based on the drawings.

第1図は本考案の一例による埋没材の落下防止
の手段として、上部内周面にテーパーを有するリ
ング1を用いて製作した鋳造用鋳型の断面図であ
る。
FIG. 1 is a cross-sectional view of a casting mold manufactured using a ring 1 having a tapered upper inner circumferential surface as a means for preventing investment material from falling according to an example of the present invention.

本考案のリング1を用いて鋳造用鋳型を製作す
る方法を第1図により説明する。第1図には、歯
冠形状の鋳造成形部と湯道(スプルー線)からな
るワツクスパターン5が図示されている。このワ
ツクスパターン5を保持台3に直立させるととも
に、前記上部内周面にテーパーを有するリング1
にリングライナー4を装着させ、これを保持台3
の嵌合部に嵌合、保持する。次いでリング1内に
クリストバライトや石英などの鋳砂とバインダー
などからなる各種の埋没材2、例えばエチルシリ
ケート系埋没材、石膏埋没材、リン酸塩系埋没材
などのスラリー状を流入し硬化させる。次に保持
台3を取外し、700〜900℃で加熱処理することに
よりワツクスを焼却するとともに鋳型の強度を高
める。以上のようにして鋳造用鋳型が製作され
る。本考案のリング1は、前記した如く、その上
部先端の内面にテーパーを有するため、鋳型製作
作業中に埋没材2が抜けたり落下せず、作業を合
理化、安全化することができる。
A method of manufacturing a casting mold using the ring 1 of the present invention will be explained with reference to FIG. FIG. 1 shows a wax pattern 5 consisting of a crown-shaped cast part and a runner (sprue line). This wax pattern 5 is made to stand upright on the holding table 3, and a ring 1 having a taper on the upper inner circumferential surface
Attach the ring liner 4 to the holding base 3.
Fits and holds in the fitting part of. Next, various types of investment materials 2 made of casting sand such as cristobalite or quartz and a binder, such as a slurry of ethyl silicate investment material, gypsum investment material, phosphate investment material, etc., are then poured into the ring 1 and hardened. Next, the holding stand 3 is removed and heated at 700 to 900°C to burn off the wax and increase the strength of the mold. A casting mold is manufactured as described above. As described above, the ring 1 of the present invention has a taper on the inner surface of its upper tip, so that the investment material 2 does not come off or fall during mold making work, making the work more efficient and safe.

なお、第2図に第1図のリング1のテーパー部
の要部拡大図を示す。
Incidentally, FIG. 2 shows an enlarged view of the main part of the tapered part of the ring 1 shown in FIG. 1.

本考案の鋳造用鋳型の埋没材に周設するリング
において、埋没材を落下させないようにするため
の手段としては、該リングの端部を含む上端部に
埋没材を係止するための該リングの内径を縮径し
ない(拡径状の)係止部を設ければよく、そのた
めの態様としては前記第1図のものに限定されず
種々のものが考えられる。前記した埋没材の落下
を防止するための係止部の態様のいくつかを、第
3図及び第4図に示す。
In the ring provided around the investment material of the casting mold of the present invention, as a means for preventing the investment material from falling, the ring for locking the investment material at the upper end including the end of the ring. What is necessary is to provide a locking portion that does not reduce the inner diameter of the inner diameter (increased diameter), and various types of locking portions are conceivable for this purpose, not limited to the one shown in FIG. Some embodiments of the locking portion for preventing the investment material from falling are shown in FIGS. 3 and 4.

第3図は、リング1が同一外径で、かつ上部内
周部に薄肉の拡径段部を設けたものの要部段面図
を、第4図は、リング1が上部外径が拡径すると
ともに拡径段部を設けたものの要部断面図を、そ
れぞれ示す。
Fig. 3 is a step view of the main part of ring 1 with the same outer diameter and a thin diameter enlarged step on the upper inner periphery, and Fig. 4 shows the ring 1 with the upper outer diameter enlarged. At the same time, a sectional view of the main part of the one provided with the enlarged-diameter stepped portion is shown.

また、本考案においては、リング1の素材を、
従来の鋳鉄、オーステナイト系ステンレス鋼
SUS304などにかえて耐熱性(高温下での機械強
度)、高温下での耐酸化性に優れる、例えば
SUS305,308,309,310,317,321,347,384,
385などのオ−ステナイト系ステンレス鋼、
SUS430,434,444などのフエライト系ステンレ
ス鋼、SUS329などのオーステナイト系ステンレ
ス鋼、オーステナイト鋼、フエライト鋼等といつ
た金属、あるいはアルミナ、ジルコニア系のセラ
ミツク等とすることにより、鋳型使用の長寿命
化、金属酸化物混入による製品欠陥の低減化を図
ることができる。
In addition, in the present invention, the material of the ring 1 is
Traditional cast iron, austenitic stainless steel
Instead of SUS304, etc., it has excellent heat resistance (mechanical strength at high temperatures) and oxidation resistance at high temperatures, such as
SUS305, 308, 309, 310, 317, 321, 347, 384,
Austenitic stainless steels such as 385,
By using ferritic stainless steels such as SUS430, 434, and 444, austenitic stainless steels such as SUS329, metals such as austenitic steel, ferrite steel, or alumina and zirconia ceramics, the life of the mold can be extended. , it is possible to reduce product defects due to metal oxide contamination.

なお、本考案は、前記したように金属リング1
の素材を、従来の鋳鉄などに替えて耐熱性、耐酸
化性のものとしているため、この観点からも埋没
材の落下防止手段が要請される。即ち、従来の鋳
鉄製などの金属リングにおいては、その内壁面の
肌が劣化して埋没材をある程度、係止するように
なるが、本考案にいては劣化が抑制されるため積
極的に埋没材を落下させない手段を講じることが
必要である。
Note that, as described above, the present invention has a metal ring 1.
Since the material used in the investment is heat-resistant and oxidation-resistant instead of conventional cast iron, a means to prevent the investment material from falling is required from this point of view as well. In other words, in conventional metal rings such as those made of cast iron, the skin of the inner wall deteriorates and the investment material is held in place to some extent, but with the present invention, deterioration is suppressed and the investment material is actively retained. It is necessary to take measures to prevent the material from falling.

本考案のリングを用いて調整した鋳造用鋳型
は、第1図に示される結晶化ガラス系の人工歯冠
の鋳造ばかりでなく、各種の鋳造品を製造すると
きにも用いることができる。その際、真空鋳造
法、真空加圧鋳造法、遠心鋳造法などの鋳造法が
採用される。
A casting mold prepared using the ring of the present invention can be used not only for casting the crystallized glass-based artificial tooth crown shown in FIG. 1, but also for manufacturing various cast products. At that time, casting methods such as vacuum casting, vacuum pressure casting, and centrifugal casting are employed.

実施例/比較例 リング保持台にワツクスパターンを取り付け、
その周囲に外径が30mm、高さが50mmで、上部内周
面にテーパーを設けた金属リング(材質
SUS310)を配置した後、リング内にエチルシル
ケート系埋没材を流入し、硬化するまで放置し
た。
Example/Comparative example: Attach a wax pattern to the ring holder,
Around it is a metal ring (material:
After placing the SUS310), ethyl silicate-based investment material was poured into the ring and left until it hardened.

次いでリング焼成炉内で焼く850℃で約30分間
焼成した後、重量%でSiO2 50、CaO 20、P2O5
7、MgO 5、Al2O3 18の組成を有する1500
℃のガラス溶湯を鋳型に入れ、真空加圧鋳造機に
より鋳造した。
Then bake in a ring firing furnace at 850℃ for about 30 minutes, then produce SiO 2 50, CaO 20, P 2 O 5 in weight%
7, MgO 5, Al 2 O 3 1500 with a composition of 18
A molten glass at ℃ was placed in a mold and cast using a vacuum pressure casting machine.

同様に、外径が30mm、高さ50mmで、上部内周面
に薄肉の拡径段部を設けたセラミツクリング(材
質アルミナ)を用いて上記と同様の条件で鋳造を
行なつた。
Similarly, casting was performed under the same conditions as above using a ceramic ring (made of alumina) with an outer diameter of 30 mm, a height of 50 mm, and a thin diameter-enlarging stepped portion on the upper inner peripheral surface.

比較例として、外径が30mm、高さが50mmの従来
の円筒状リング(材質SUS304)を用いて上記と
同様の条件で鋳造を行なつた。
As a comparative example, a conventional cylindrical ring (made of SUS304) with an outer diameter of 30 mm and a height of 50 mm was used for casting under the same conditions as above.

上記3通りの鋳造作業を各々10回、計30回行な
つたところ、実施例によるリングを用いた鋳型は
埋没材の抜け落ちがなく、製品欠陥となる様な異
物の混入もなかつた。
When the above three types of casting operations were performed 10 times each, a total of 30 times, the mold using the ring according to the example did not have any investment material falling out, and no foreign matter was mixed in that would cause product defects.

しかし、比較例によるリングを用いた鋳型は埋
没材の抜け落ちが8回あり、リング酸化物の混入
も全数認められ、また全体的に実施例のものに比
べて鋳造安定性も良くなかつた。
However, in the mold using the ring according to the comparative example, the investment material fell off eight times, ring oxide was found mixed in all molds, and overall casting stability was not as good as that of the example.

〔考案の効果〕[Effect of idea]

本考案の鋳造用鋳型のリングは、埋没材の落下
防止手段を有しているので、該リングを用いて鋳
造鋳型を製作した場合、次のような効果を奏す
る; () 特に鋳型製作時に埋没材の抜けや落下を
有効に防止することができるため、作業の合理
化、安全化を図ることができる。
The ring of the casting mold of the present invention has a means to prevent investment material from falling, so when a casting mold is manufactured using the ring, the following effects are achieved; Since it is possible to effectively prevent materials from falling out or falling, work can be streamlined and made safer.

() 真空加圧鋳造法を採用した場合、空気の
流れがテーパーなどの落下防止手段によつて埋
没材内部を均一に流れるため鋳造安定性が得ら
れる。
() When the vacuum pressure casting method is adopted, casting stability is achieved because the air flows uniformly inside the investment material using fall prevention means such as a taper.

() リングの素材を耐酸化性の金属あるいは
セラミツクにすることにより鋳型の耐久性の改
善や金属酸化物などの混入による製品欠陥の欠
点を改善することができる。
() By using an oxidation-resistant metal or ceramic as the material for the ring, it is possible to improve the durability of the mold and to eliminate product defects caused by the contamination of metal oxides.

また、耐酸化性の金属あるいはセラミツクを
用いた場合、従来のステンレスを用いた場合に
比べてリング内壁面を酸化されにくく平滑性が
維持され、埋没材が抜けやすくなるため、埋没
材の抜けや落下の防止は特に有効である。
In addition, when oxidation-resistant metal or ceramic is used, the inner wall surface of the ring is less likely to be oxidized than when conventional stainless steel is used, and smoothness is maintained, making it easier for the investment material to come out. Fall prevention is particularly effective.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の一例による埋没材の落下防
止手段付きリングを用いて製作した鋳造用鋳型の
断面図である。第2図は、第1図のリングのテー
パー部の用部拡大図である。第3図は、他の埋没
材の落下防止手段をもつリングの要部断面図、第
4図は、さらに他の埋没材の落下防止手段をもつ
リングの要部断面図である。 1……リング、2……埋没材、3……保持台、
4……リングライナー、5……ワツクスパター
ン。
FIG. 1 is a sectional view of a casting mold manufactured using a ring with means for preventing falling of investment material according to an example of the present invention. 2 is an enlarged view of the tapered portion of the ring shown in FIG. 1; FIG. FIG. 3 is a cross-sectional view of a main part of a ring having another means for preventing falling of an investment material, and FIG. 4 is a cross-sectional view of a main part of a ring having still another means for preventing a fall of an investment material. 1...Ring, 2...Investment material, 3...Holding stand,
4...Ring liner, 5...Wax pattern.

Claims (1)

【実用新案登録請求の範囲】 1 鋳造用鋳型の埋没材に周設するリングにおい
て、該リングが、該リングの端部を含む上端部
に埋没材を係止するための拡径状の係止部を有
するものであることを特徴とする鋳造用鋳型の
リング。 2 係止部が、同一外径のリングの端部を含む上
端部の内周面に形成されたテーパー部である請
求項1に記載の鋳造用鋳型のリング。 3 係止部が、同一外径のリングの端部を含む上
端部の内周面に形成された薄肉の拡径段部であ
る請求項1に記載の鋳造用鋳型のリング。 4 係止部が、リングの端部を含む上端部に形成
された拡径段部である請求項1に記載の鋳造用
鋳型のリング。
[Claims for Utility Model Registration] 1. In a ring provided around the investment material of a casting mold, the ring has an enlarged diameter locking shape for locking the investment material at the upper end including the end of the ring. A ring for a casting mold, characterized in that the ring has a part. 2. The casting mold ring according to claim 1, wherein the locking portion is a tapered portion formed on the inner circumferential surface of the upper end portion including the end portions of the ring having the same outer diameter. 3. The casting mold ring according to claim 1, wherein the locking portion is a thin-walled enlarged diameter stepped portion formed on the inner circumferential surface of the upper end portion including the end portions of the ring having the same outer diameter. 4. The ring of a casting mold according to claim 1, wherein the locking portion is a diameter-enlarging stepped portion formed at an upper end portion including an end portion of the ring.
JP1988021264U 1988-02-22 1988-02-22 Expired JPH0444293Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988021264U JPH0444293Y2 (en) 1988-02-22 1988-02-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988021264U JPH0444293Y2 (en) 1988-02-22 1988-02-22

Publications (2)

Publication Number Publication Date
JPH01128936U JPH01128936U (en) 1989-09-01
JPH0444293Y2 true JPH0444293Y2 (en) 1992-10-19

Family

ID=31238348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988021264U Expired JPH0444293Y2 (en) 1988-02-22 1988-02-22

Country Status (1)

Country Link
JP (1) JPH0444293Y2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH091284A (en) * 1995-06-15 1997-01-07 Nippon Flour Mills Co Ltd Clay for casting mold and casting method using the same
JP7300921B2 (en) * 2019-07-25 2023-06-30 株式会社巴川製紙所 sheet for casting

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4425998Y1 (en) * 1965-07-21 1969-10-31
JPS5614915U (en) * 1979-07-11 1981-02-09

Also Published As

Publication number Publication date
JPH01128936U (en) 1989-09-01

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