JPH06126422A - Vacuum pressurized casting method and apparatus therefor - Google Patents
Vacuum pressurized casting method and apparatus thereforInfo
- Publication number
- JPH06126422A JPH06126422A JP30831692A JP30831692A JPH06126422A JP H06126422 A JPH06126422 A JP H06126422A JP 30831692 A JP30831692 A JP 30831692A JP 30831692 A JP30831692 A JP 30831692A JP H06126422 A JPH06126422 A JP H06126422A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- crucible
- opening
- mold
- casting container
- 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.)
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- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、真空加圧鋳造装置に関
し、更に詳しくはコンプレッサー等の圧縮空気供給手段
を必要とすることなく、大気圧による加圧鋳造を可能と
して装置構造を簡略化した真空加圧鋳造方法およびその
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum pressure casting apparatus, and more specifically, it simplifies the apparatus structure by enabling pressure casting at atmospheric pressure without requiring compressed air supply means such as a compressor. The present invention relates to a vacuum pressure casting method and its apparatus.
【０００２】[0002]
【従来の技術】従来の真空加圧鋳造方法としては、例え
ば実公昭５２−３９０５３号公報に記載された真空圧迫
鋳造装置のような装置を用いる方法が代表的である。こ
の鋳造装置の構造は、基台の上面に立設した支柱に、通
気管を兼ねるとともに少なくとも１８０°回転する回転
軸を突設し、この回転軸の一端に鋳造室を取り付け、こ
の鋳造室内に加熱装置を外装したルツボを固定し、ルツ
ボの開口上位にこれに相対して下向き開口した鋳型を取
り付けるとともに、前記通気管をバルブを介してコンプ
レッサーに連結した圧縮空気送入口、真空ポンプに連結
した真空ポンプ挿入口等に連通させて構成されている。
そして、この真空圧迫鋳造装置による鋳造方法は、コン
プレッサーから送られる空気の圧力が数気圧となるよう
に予め準備しておき、鋳造室内のルツボに投入した金属
を加熱装置により溶融し、真空ポンプで鋳造室内の空気
その他のガスを排出して減圧した後、鋳造室を回転軸を
中心として１８０°回転させることでルツボと鋳型との
位置を上下に逆転させてルツボ内の溶融金属を鋳型内に
流し込み、この直後にバルブを開いてコンプレッサーか
らの圧縮空気を鋳造室内に送給して鋳造室内を圧縮空気
により加圧状態として鋳型内に鋳込まれた金属溶湯を鋳
型の鋳造空間の内奥部まで押し込むことにより、鋳込不
足や鋳造製品中の気泡の発生を防止してなるものであ
る。2. Description of the Related Art As a conventional vacuum pressure casting method, a method using a device such as a vacuum compression casting device described in Japanese Utility Model Publication No. 52-39053 is representative. The structure of this casting apparatus is such that a support shaft standing on the upper surface of a base is provided with a rotary shaft that also functions as a ventilation pipe and rotates at least 180 °, and a casting chamber is attached to one end of this rotary shaft. The crucible with a heating device was fixed, and a mold having a downward opening was attached to the upper part of the opening of the crucible, and the ventilation pipe was connected to a compressed air inlet connected to a compressor via a valve and a vacuum pump. It is configured to communicate with a vacuum pump insertion port or the like.
Then, the casting method by this vacuum compression casting device is prepared in advance so that the pressure of the air sent from the compressor becomes several atmospheres, and the metal charged into the crucible in the casting chamber is melted by the heating device, and the vacuum pump is used. After exhausting air and other gases from the casting chamber to reduce the pressure, the casting chamber is rotated 180 ° about the axis of rotation to reverse the position of the crucible and the mold upside down and the molten metal in the crucible into the mold. Immediately after this, the valve is opened to send compressed air from the compressor into the casting chamber, and the molten metal cast in the casting mold is compressed by the compressed air in the casting chamber. By pushing to the bottom, it is possible to prevent insufficient casting and generation of bubbles in the cast product.
【０００３】[0003]
【発明が解決しようとする課題】上記のように、加圧真
空鋳造方法というのは金属を溶融した鋳造室内を減圧
し、この減圧下で溶融金属を鋳型内に鋳込んだ後、鋳造
室内を圧縮空気により加圧して、鋳込前後の差圧により
押し湯を行うものである。ところで、単に鋳込操作の前
後で鋳造室内の圧力に差を出すだけであれば、従来装置
のようにコンプレッサーから圧縮空気を送給しなくと
も、鋳造室内へ大気を導入するだけでもよいはずであ
り、その方が装置の構造や取扱いも簡単で、故障も少な
く、しかも装置の製造コストの低減にもなる。As described above, the pressure vacuum casting method is to depressurize the casting chamber in which the metal is melted, cast the molten metal in the casting mold under the reduced pressure, and Pressurized water is applied by pressurizing with compressed air, and the differential pressure before and after casting. By the way, if it is only necessary to make a difference in the pressure in the casting chamber before and after the casting operation, it would be sufficient to introduce the atmosphere into the casting chamber without sending compressed air from the compressor as in the conventional device. In that case, the structure and handling of the device are simpler, there are less failures, and the manufacturing cost of the device is reduced.
【０００４】ところが、上記のように従来の真空加圧鋳
造装置の場合には、通気管を介して鋳造室内の空気等を
排出し、また、圧縮空気を送給するものであることか
ら、鋳型への溶融金属の鋳込直後に鋳造室内を加圧する
には前記通気管からコンプレッサーへ連結する給気路の
途中に設けたバルブから鋳造室内を含めた全ての空間を
加圧状態としなければならない。このため、鋳型内の金
属溶湯が凝固するまでの短時間の間に鋳造室内を所定の
加圧状態とするためには、前記のように数気圧といった
比較的高い圧力の圧縮空気を送給する必要がある。しか
も、装置の構造上前記の通気管の内径の大きさにも限度
があることから、特に、鋳造室から通気管を経てコンプ
レッサーにいたるまでの距離が長くなると、圧縮空気の
圧力をより高く設定する必要があるし、また鋳込後の鋳
造室内への圧縮空気の導入を促進するためには、鋳造室
内の減圧度も高く（より真空に近く）する必要があっ
た。However, in the case of the conventional vacuum pressure casting apparatus as described above, the air and the like in the casting chamber are discharged through the ventilation pipe, and the compressed air is fed, so that the mold is used. In order to pressurize the casting chamber immediately after the molten metal is cast into the casting chamber, all the space including the casting chamber must be pressurized from the valve provided in the middle of the air supply path connecting the ventilation pipe to the compressor. . Therefore, in order to bring the casting chamber into a predetermined pressurized state within a short time until the molten metal in the mold is solidified, compressed air having a relatively high pressure such as several atmospheres is fed as described above. There is a need. Moreover, since the size of the inner diameter of the ventilation pipe is limited due to the structure of the device, the compressed air pressure is set higher when the distance from the casting chamber through the ventilation pipe to the compressor becomes longer. In addition, in order to promote the introduction of compressed air into the casting chamber after casting, the degree of pressure reduction in the casting chamber also needs to be high (closer to vacuum).
【０００５】本発明は上記の点に鑑み、コンプレッサー
等の圧縮空気送給手段を必要とせず大気圧による押し湯
が可能で装置の構造が簡単となり、鋳造操作やメンテナ
ンスも容易で故障の恐れも少なく、しかも装置の製造コ
ストを低減することができるだけでなく、金属の溶融、
鋳込時の鋳造室内の減圧度が低くても鋳造可能で真空ポ
ンプ等の能力も合理化することができる真空加圧鋳造方
法およびそれを実施するための鋳造装置を提供せんとす
るものである。In view of the above points, the present invention is capable of pressurizing hot water at atmospheric pressure without the need for a compressed air feeding means such as a compressor, which simplifies the structure of the apparatus, facilitates casting operation and maintenance, and may cause failure. Not only can the manufacturing cost of the device be reduced, but also metal melting,
The present invention provides a vacuum pressure casting method capable of casting even if the degree of pressure reduction in the casting chamber at the time of casting is low and rationalizing the capacity of a vacuum pump and the like, and a casting apparatus for carrying out the method.
【０００６】[0006]
【課題を解決するための手段】本発明では、外壁に密閉
可能な通気口を設けた気密鋳造容器内で金属を加熱溶融
するとともにこの鋳造容器内を減圧し、溶融した金属を
減圧状態下で鋳型内に鋳込むと同時に前記鋳造容器の外
壁の通気口を開口して鋳造容器内を大気に開放してなる
真空加圧鋳造方法により上記の目的を達成した。According to the present invention, a metal is heated and melted in an airtight casting container having a vent hole capable of being hermetically sealed on the outer wall, and the inside of the casting container is depressurized, and the molten metal is depressurized. The above object was achieved by a vacuum pressure casting method in which a vent hole on the outer wall of the casting container was opened at the same time as casting into the mold to open the interior of the casting container to the atmosphere.
【０００７】この鋳造方法におけるルツボから鋳型内へ
の溶融金属の鋳込方法としては、気密鋳造容器内の下部
に、上向開口状にルツボを配し、前記ルツボの開口上方
に、湯口をルツボの開口に相対して下向開口状に鋳型を
配し、ルツボ内の金属を加熱溶融し、金属の溶融後、前
記ルツボと鋳型との位置を上下に逆転させてルツボ内の
溶融金属を鋳型内に鋳込むようにし、この鋳込操作と同
時に通気口を開口する方法がよい。As a method of pouring molten metal from the crucible into the mold in this casting method, a crucible is arranged in an upward opening shape in the lower part of the airtight casting container, and a sprue is provided above the opening of the crucible. The mold is placed in a downward opening relative to the opening of the crucible, the metal in the crucible is heated and melted, and after the metal is melted, the position of the crucible and the mold is reversed upside down to mold the molten metal in the crucible. A method is preferred in which the vent is opened at the same time as this casting operation.
【０００８】また、上記の真空加圧鋳造方法を具体的に
実施する鋳造装置として本発明では、排気手段に連結
し、気密に密閉可能な気密鋳造容器内に、ルツボと、該
ルツボを装着する加熱炉、および鋳型を設け、前記鋳造
容器の外壁の適所に鋳造容器外に連通する通気口を設け
るとともに、該通気口を密閉する開閉蓋を設けてなる真
空加圧鋳造装置を提供する。Further, in the present invention, as a casting apparatus for specifically carrying out the above vacuum pressure casting method, in the present invention, the crucible and the crucible are mounted in an airtight casting container which can be hermetically sealed by being connected to an exhaust means. Provided is a vacuum pressure casting apparatus comprising a heating furnace, a mold, a ventilation port communicating with the outside of the casting container at an appropriate position on the outer wall of the casting container, and an opening / closing lid for sealing the ventilation port.
【０００９】更に、本発明では、前記鋳造装置として、
鋳造容器内の下部に、ルツボを上向開口状に装着する加
熱炉を設け、この加熱炉の上方に、湯口をルツボの開口
に相対させて下向開口状に鋳型を着脱自在に装着すると
ともに、前記鋳造容器内のルツボと鋳型との位置を上下
逆転させる位置逆転手段を設けてなり、前記ルツボと鋳
型との上下位置が逆転すると同時に該鋳造容器の外壁の
適所に設けた通気口の開閉蓋を開放する開蓋手段を設け
てなる鋳造装置、また、気密鋳造容器を少なくとも１８
０°回転可能な回転軸に取り付け、前記鋳造容器を１８
０°回転させて上下に反転させることによりルツボと鋳
型との位置を上下に逆転させる鋳造装置、そして、前記
鋳造装置において、回転軸が減圧手段に連結した排気管
を兼ね、鋳造容器に開閉可能な天蓋を設け、該天蓋下面
に鋳造容器内に装着した鋳型を下方へ弾性付勢する付勢
手段を設けるとともに、前記鋳造容器の下壁の適所に該
気密鋳造容器を上下反転させた時に開放する開閉蓋によ
り鋳造容器の外部に連通する通気口を設けてなる鋳造装
置、更には、前記鋳造装置において、鋳造装置における
基体の側壁から回転軸を突設し、該回転軸に鋳造容器を
基体に対して上下反転可能に連結し、前記鋳造容器の外
壁に設けた通気口を開閉する開閉蓋の一端を鋳造容器外
壁に枢着し、開閉蓋の他端を鋳造容器から基体の側壁方
向へ突出させるとともに、該突出部分に、回転軸を中心
とする回転方向に対して前上がり状に傾斜した傾斜辺を
有する操作部を設けるとともに、該操作部に対して回転
軸の反対側に位置する基体側壁部分に、鋳造容器を上下
反転させた時に前記操作部の傾斜辺に係合するストッパ
ーを設けてなる鋳造装置、の各真空加圧鋳造装置を提供
している。Further, according to the present invention, the casting apparatus includes:
A heating furnace for installing the crucible in an upward opening is provided in the lower part of the casting container, and a mold is detachably installed in the downward opening with the gate facing the opening of the crucible above the heating furnace. A position reversing means for vertically reversing the positions of the crucible and the mold in the casting container, and opening and closing a vent provided at a proper position on the outer wall of the casting container at the same time when the upper and lower positions of the crucible and the mold are reversed. A casting device provided with a lid opening means for opening the lid, and an airtight casting container at least 18
Attached to a rotary shaft that can rotate 0 °,
A casting device that rotates the crucible and the mold upside down by turning it by 0 ° and turning it upside down, and in the casting device, the rotating shaft also serves as an exhaust pipe connected to a pressure reducing means and can be opened and closed in a casting container. A canopy is provided, and the lower surface of the canopy is provided with an urging means for elastically urging the mold mounted in the casting container downward, and opened when the airtight casting container is turned upside down at a proper position on the lower wall of the casting container. A casting device having a vent hole communicating with the outside of the casting container by an opening / closing lid, and further, in the casting device, a rotary shaft is provided so as to project from a side wall of the base body in the casting device, and the casting container is mounted on the rotary shaft. And one end of an opening / closing lid that opens and closes a vent provided on the outer wall of the casting container is pivotally attached to the outer wall of the casting container, and the other end of the opening / closing lid extends from the casting container toward the side wall of the base body. When it is projected In addition, the protruding portion is provided with an operating portion having an inclined side that is inclined forward and upward with respect to the rotation direction about the rotation axis, and the base body is located on the opposite side of the rotation axis with respect to the operation portion. The present invention provides each vacuum pressure casting device of a casting device in which a stopper is provided on the side wall portion so as to engage with the inclined side of the operating portion when the casting container is turned upside down.
【００１０】また、本発明では、前記のような各鋳造装
置におけるルツボと鋳型の構造として、鋳型の湯口の開
口縁の内径をルツボの開口縁の外径より大きく設定する
とともに、前記湯口奥部の内径を湯口の奥端部から開口
縁に向かって所定の長さにわたってルツボの内径よりも
小さく設定することを提案している。Further, in the present invention, as the structure of the crucible and the mold in each of the above-mentioned casting apparatuses, the inner diameter of the opening edge of the sprue of the mold is set to be larger than the outer diameter of the opening edge of the crucible, and It is proposed that the inner diameter of the crucible is set to be smaller than the inner diameter of the crucible over a predetermined length from the rear end portion of the sprue toward the opening edge.
【００１１】[0011]
【作用】前記のような本発明に係る真空加圧鋳造方法に
よれば、気密鋳造容器内で溶融した金属を減圧下で鋳型
内に鋳込むことで鋳型の鋳込室内に速やかに溶融金属が
鋳込まれると同時に、鋳造容器の外壁の通気口を開口し
て鋳造容器内を大気に開放することで、鋳造容器内が鋳
込時の減圧状態から直ちに大気圧まで加圧されることで
押し湯を行う。According to the vacuum pressure casting method according to the present invention as described above, the molten metal is rapidly cast into the casting chamber of the mold by casting the molten metal in the airtight casting container into the casting mold under reduced pressure. At the same time as the casting, by opening the vent hole on the outer wall of the casting container and opening the interior of the casting container to the atmosphere, the pressure inside the casting container is immediately increased from the depressurized state at the time of casting to the atmospheric pressure, thereby pushing. Do hot water.
【００１２】また、鋳造容器の下部にルツボを上向開口
状に設け、その上方に鋳型を下向開口状に設けてなる請
求項４〜請求項６に記載した装置では、ルツボ内で金属
を溶融した後、ルツボと鋳型との上下の位置を逆転させ
ることで、ルツボが下向開口状態となり、ルツボ内の金
属溶湯が流下してその下方に位置する上向開口状となっ
た鋳型内に鋳込まれる。Further, in the apparatus according to any one of claims 4 to 6, wherein the crucible is provided in the lower part of the casting container in an upward opening shape, and the mold is provided in the lower part of the casting container in the downward opening shape. After melting, by reversing the upper and lower positions of the crucible and the mold, the crucible becomes a downward opening state, the molten metal in the crucible flows down, and the crucible is positioned in the downward opening positioned in the mold. Be cast.
【００１３】更に、請求項７に記載した、基体の側壁か
ら突設した回転軸に鋳造容器を連結し、この鋳造容器の
外壁に設けた通気口を開閉する開閉蓋の一端を鋳造容器
外壁に枢着し、開閉蓋の他端を鋳造容器から基体の側壁
方向へ突出させてその突出部分に、回転軸を中心とする
回転方向に対して前上がり状に傾斜した傾斜辺を有する
操作部を設け、この操作部に対して回転軸の反対側に位
置する基体側壁部分に、鋳造容器を上下反転させた時に
前記操作部の傾斜辺に係合するストッパーを設けてなる
装置では、鋳造容器内で金属を溶解するとともに内部を
減圧した鋳造容器を回転軸を中心として１８０°回転さ
せると、ルツボと鋳型との上下位置が逆転してルツボ内
の溶融金属が鋳型内に鋳込まれると同時に、鋳造容器の
通気口を開閉する開閉蓋の操作部の傾斜辺が基体に設け
たストッパーに係合して押し上げられ、通気口が溶融金
属の鋳込操作と同時に自動的に開口して鋳造室内が大気
に開放され、押し湯が行なわれる。Further, according to claim 7, the casting container is connected to a rotary shaft protruding from the side wall of the base body, and one end of an opening / closing lid for opening and closing a vent provided on the outer wall of the casting container is attached to the outer wall of the casting container. It is pivotally attached, and the other end of the opening / closing lid is projected from the casting container toward the side wall of the base body. In a device provided with a stopper which engages with the inclined side of the operating portion when the casting container is turned upside down, the inside of the casting container When the casting container, in which the metal has been melted and the pressure inside has been reduced by 180 ° about the axis of rotation, the upper and lower positions of the crucible and the mold are reversed and the molten metal in the crucible is cast into the mold, Open and close the vent of the casting container The sloping side of the operation part of the lid is pushed up by engaging with the stopper provided on the base body, and the vent hole is automatically opened at the same time as the molten metal pouring operation, the casting chamber is opened to the atmosphere, Done.
【００１４】また、鋳型内に鋳込まれた金属溶湯の余剰
分は湯口の内奥部で凝固するが、前記のような鋳造装置
に用いる鋳型の湯口の開口縁の内径をルツボの開口縁の
外径より大きく設定することにより、ルツボから鋳型へ
の鋳込時に溶融金属が鋳型の外部へ漏れることを防止す
るとともに、前記湯口奥部の内径を湯口の奥端部から開
口縁に向かって所定の長さにわたってルツボの内径より
も小さく設定した場合には、湯口内で凝固する余剰金属
がルツボの内径より小さい大きさに凝固することで、余
剰金属をそのままの形で再びルツボ内に投入して鋳造金
属として再利用できる。Further, the surplus of the molten metal cast in the mold is solidified in the inner part of the sprue, but the inner diameter of the opening edge of the sprue of the mold used in the casting apparatus is set to the opening edge of the crucible. By setting it larger than the outer diameter, while preventing molten metal from leaking to the outside of the mold at the time of casting from the crucible to the mold, the inner diameter of the sprue inner part is predetermined from the rear end part of the sprue toward the opening edge. If the inner diameter of the crucible is set smaller than the inner diameter of the crucible, the surplus metal solidified in the sprue will be solidified to a size smaller than the inner diameter of the crucible, and the surplus metal will be put into the crucible as it is. Can be reused as cast metal.
【００１５】[0015]
【実施例】以下、本発明に係る真空加圧鋳造方法を、図
面に示した鋳造装置の実施例に基づき具体的、かつ詳細
に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The vacuum pressure casting method according to the present invention will now be described specifically and in detail based on the embodiment of the casting apparatus shown in the drawings.
【００１６】図１は本発明に係る真空加圧鋳造装置の１
実施例を示す斜視図である。図中符号１で示すものが、
基板２の一側に設けた基体であり、その上面には各種ス
イッチ類やタイマー等を備えた操作部３が、また、その
側面には真空計４を設けている。更に、この基体１の側
面から水平方向側方へ突設した回転軸５には、上部に開
閉自在な天蓋６を設けてなり、かつ気密に密閉可能な鋳
造容器７を固定している。また、この鋳造容器７の下壁
部分には、開閉蓋８により密閉可能で鋳造容器７の内外
に連通する通気口９を設けている。FIG. 1 shows a vacuum pressure casting apparatus 1 according to the present invention.
It is a perspective view showing an example. The one indicated by reference numeral 1 in the drawing is
A base body provided on one side of the substrate 2, on the upper surface of which an operation unit 3 including various switches and timers, and on its side surface, a vacuum gauge 4 is provided. Furthermore, a rotary shaft 5 protruding laterally from the side surface of the base 1 is provided with an openable / closable canopy 6 on the upper part thereof, and a casting container 7 which is hermetically sealed is fixed. Further, the lower wall portion of the casting container 7 is provided with a vent 9 which can be closed by an opening / closing lid 8 and communicates with the inside and outside of the casting container 7.
【００１７】前記回転軸５は、図２、図３に示すように
ベアリング１０を介して基体１に対して少なくとも１８
０°回転して鋳造容器７を上下に反転可能に取り付けて
基体１の内部に、この回転軸５を回転させるギアモータ
１１を設けている。また、基体１の内部には真空ポンプ
１２を設け、ここからパイプ１３を前記回転軸５を通し
て鋳造容器７へ連通させており、回転軸５が排気管を兼
ねている。また、鋳造容器７の上部の天蓋６はその一側
端をヒンジ１４で鋳造容器７に開閉自在に取り付けると
ともにその他側側には、上端にハンドル１５を連設した
ロック杆１６を設け、また天蓋６の下面には鋳造容器７
の開口縁に密接するゴムリング等のシール部材１７を周
設して鋳造容器７内を気密に密閉可能としてなる。The rotary shaft 5 is at least 18 relative to the base body 1 via a bearing 10 as shown in FIGS.
A gear motor 11 for rotating the rotary shaft 5 is provided inside the base 1 by mounting the casting container 7 upside down so as to rotate 0 °. Further, a vacuum pump 12 is provided inside the base body 1, and a pipe 13 is communicated with the pipe 13 through the rotating shaft 5 from the casting pump 7, and the rotating shaft 5 also serves as an exhaust pipe. Further, the canopy 6 on the upper portion of the casting container 7 has one end attached to the casting container 7 by a hinge 14 so as to be openable and closable, and the other side is provided with a lock rod 16 having a handle 15 connected to the upper end thereof. The bottom of 6 has a casting container 7
A sealing member 17 such as a rubber ring, which is in close contact with the opening edge of the casting container 7, is provided around the casting container 7 so that the casting container 7 can be hermetically sealed.
【００１８】また鋳造容器７の下壁部分に設けた通気口
９の開口縁には、この通気口９を開閉する開閉蓋８に密
接するゴムリング等のシール部材１８を周設している。
この通気口９を開閉する開閉蓋８は、その一端をヒンジ
１９にて鋳造容器７の下壁に開閉自在に枢着するととも
に、図示しないバネ等の付勢手段により、この開閉蓋８
が常に通気口９を閉止する方向に付勢している。また、
この開閉蓋８の他側側は鋳造容器７の側壁より基体１方
向へ突出させており、その先端を前記回転軸５方向へ屈
曲形成するとともにその屈曲片の先端部分に回転軸５を
中心とする鋳造容器７の回転方向に対して前上がり状に
傾斜した傾斜辺２０を形成して操作部２１としている。
一方、基体１の側面には、前記鋳造容器７を回転軸５を
中心に回動させたときに、前記開閉蓋８の操作部２１に
設けた傾斜辺２０に係合する位置にストッパーピン２２
を突設している。A sealing member 18, such as a rubber ring, which is in close contact with an opening / closing lid 8 for opening / closing the vent hole 9 is provided around the opening edge of the vent hole 9 provided in the lower wall portion of the casting container 7.
The opening / closing lid 8 for opening / closing the vent hole 9 has one end pivotally attached to the lower wall of the casting container 7 by a hinge 19 so as to be openable / closable, and the opening / closing lid 8 is opened by a biasing means such as a spring (not shown).
Always biases the vent hole 9 in the closing direction. Also,
The other side of the opening / closing lid 8 is projected from the side wall of the casting container 7 in the direction of the base body 1, and its tip is bent in the direction of the rotary shaft 5 and the rotary shaft 5 is centered at the tip of the bent piece. The operation side 21 is formed by forming an inclined side 20 that is inclined forward and upward with respect to the rotation direction of the casting container 7.
On the other hand, the stopper pin 22 is provided on the side surface of the base body 1 at a position where the casting container 7 is engaged with the inclined side 20 provided on the operation portion 21 of the opening / closing lid 8 when the casting container 7 is rotated about the rotating shaft 5.
Is protruding.
【００１９】そして、鋳造容器７内部には、その下部に
加熱炉２３が鋳造容器７内面との間に間隙を残して図示
しない支持部材によって固定されている。この加熱炉２
３はその周囲を金属リング２４で囲み、その内部にセラ
ミックスファイバーを含む無機断熱材４０等を充填し、
上面中央部に上向開口状のルツボ装着部２５を穿設する
とともに、該ルツボ装着部２５の周囲に加熱手段２６を
埋設している。この加熱手段は、図示しないが、回転軸
５内を通って前記基体１に設けた電源等に連結してい
る。前記加熱炉２３のルツボ装着部２５内に装着するル
ツボは、図面に示した実施例においては、外側に高純度
アルミナ等の磁性体からなるセラミックスルツボ２７を
配し、このセラミックスルツボ２７の内側にカーボンル
ツボ２８を内装した２重構造のルツボを使用し、これを
加熱炉２３に上向開口状に装着している。そして、前記
のようにルツボを装着した加熱炉２３の上方には、鋳型
２９をその湯口３０を前記カーボンルツボ２８の開口に
相対させて下向開口状に取り付けている。この鋳型２９
は、金属リング３１の内部にセラミックス鋳型材３２を
埋没してロストワックス法等の方法により、その内部に
前記湯口３０に続くスプール線３３および歯科用の補綴
物等を型取った鋳込空間３４を形成している。また、前
記加熱炉２３と鋳型２９との間にはセラミックス製等の
仕切板３５を着脱自在に取り付けている。この仕切板３
５は、鋳込時に溶融金属がカーボンルツボ２８の回りの
加熱炉２３上面に付着することを防止するものであり、
汚れた場合には適宜取り替え可能としている。この仕切
板３５の表面には凹溝３６が形成されている。また、鋳
造容器７を開閉する天蓋６の下面には図示したような圧
縮バネ３７を取り付けており、鋳造容器７内に鋳型２９
を装着して天蓋６を閉じたときには、この圧縮バネ３７
により鋳型２９下面を加熱炉２３上の仕切板３５へ押し
付けるようにしている。A heating furnace 23 is fixed to the inside of the casting container 7 by a supporting member (not shown) at a lower portion thereof with a gap between the heating furnace 23 and the inner surface of the casting container 7. This heating furnace 2
3 is surrounded by a metal ring 24, and the inside thereof is filled with an inorganic heat insulating material 40 containing ceramic fibers,
An upper opening-shaped crucible mounting portion 25 is formed in the center of the upper surface, and a heating means 26 is embedded around the crucible mounting portion 25. Although not shown, this heating means passes through the inside of the rotary shaft 5 and is connected to a power source or the like provided on the base body 1. In the embodiment shown in the drawings, the crucible to be mounted in the crucible mounting portion 25 of the heating furnace 23 has a ceramic crucible 27 made of a magnetic material such as high-purity alumina on the outer side, and the ceramic crucible 27 on the inner side. A double-structured crucible having a carbon crucible 28 therein is used, and the crucible is attached to the heating furnace 23 in an upward opening shape. Then, above the heating furnace 23 having the crucible attached thereto, the mold 29 is attached in a downward opening shape with its sprue 30 facing the opening of the carbon crucible 28. This mold 29
Is a casting space 34 in which a ceramic mold material 32 is buried in a metal ring 31 and a spool wire 33 following the sprue 30 and a dental prosthesis etc. are molded therein by a method such as the lost wax method. Is formed. Further, a partition plate 35 made of ceramics or the like is detachably attached between the heating furnace 23 and the mold 29. This partition board 3
No. 5 prevents molten metal from adhering to the upper surface of the heating furnace 23 around the carbon crucible 28 during casting.
If it becomes dirty, it can be replaced as appropriate. A groove 36 is formed on the surface of the partition plate 35. Further, a compression spring 37 as shown in the drawing is attached to the lower surface of the canopy 6 that opens and closes the casting container 7, and the mold 29 is placed inside the casting container 7.
When the canopy 6 is closed by mounting the
Thus, the lower surface of the mold 29 is pressed against the partition plate 35 on the heating furnace 23.
【００２０】前記加熱炉２３と鋳型２９との詳細を図５
に示す。図示したように、外側のセラミックスルツボ２
７は、その上端が加熱炉２３の断熱材４０上面とほぼ面
一となるようにルツボ装着部２５内に着脱自在に装着し
ている。このセラミックスルツボ２７内に装着される内
側のカーボンルツボ２８は、その上端を前記断熱材４０
の上面およびセラミックスルツボ２７の開口縁より上方
に突出した状態で装着している。このカーボンルツボ２
８の突出部分に仕切板３５の中央部に設けた開口３８を
遊嵌状態に被嵌しており、カーボンルツボ２８の外面と
仕切板３５の開口３８との間に間隙が形成されている。
また、このカーボンルツボ２８の上方に装着してなる鋳
型２９の湯口３０は、その開口縁の内径が前記仕切板３
５の開口３８とほぼ等しくカーボンルツボ２８の開口縁
の外径よりも大きく設定しており、カーボンルツボ２８
の外面と湯口３０の開口内面との間には前記カーボンル
ツボ２８と仕切板３５との間と同様の隙間が形成されて
おり、仕切板３５表面に形成した凹溝３６からこれらの
隙間を通ってカーボンルツボ２８および鋳型２９の湯口
３０内部が鋳造容器７内空間に連通している。更に、図
例のものでは、前記カーボンルツボ２８の内径Ｄの大き
さに比べて、鋳型２９の湯口３０の奥端部から一定の長
さにわたってその内径ｄの大きさを小さく設定してい
る。その理由は、一般に金属を鋳造する場合には、鋳造
製品の容積に対して多めの金属を溶融して鋳込まれる。
これは、溶融金属の凝固時の収縮等を考慮するととも
に、鋳造不足による失敗をなるべく少なくするため使用
する金属量に余裕を持たせているのである。このため、
鋳型２９内に鋳込まれた溶融金属のうち、ある程度のも
のは湯口３０内で凝固する。この湯口３０内で凝固した
余剰の金属は、鋳造時に大きく変質したりしない限り
は、その先のスプール線３３内で凝固した金属とともに
再度鋳造材料として使用することができる。ところが、
湯口３０内の内径がカーボンルツボ２８の内径よりも大
きい場合には、この湯口３０内で凝固した余剰金属の塊
がカーボンルツボ２８の内径よりも大きくなってしま
い、再び鋳造材料として使用する場合に、そのままでカ
ーボンルツボ２８内に投入することができず、これを小
さく破砕する手間がかかる。そこで、前記のように鋳型
２９の湯口３０の奥端部から一定の長さにわたってその
内径ｄの大きさをカーボンルツボ２８の内径Ｄの大きさ
に比べて小さく設定しておくことで、湯口３０内で凝固
する余剰金属を、そのままの形でカーボンルツボ２８内
に投入して再使用しうる程度の大きさとすることで、前
記のような手間を省くことができるのである。The details of the heating furnace 23 and the mold 29 are shown in FIG.
Shown in. As shown, the outer ceramic crucible 2
7 is removably mounted in the crucible mounting portion 25 such that the upper end thereof is substantially flush with the upper surface of the heat insulating material 40 of the heating furnace 23. An inner carbon crucible 28 mounted in the ceramic crucible 27 has an upper end formed of the heat insulating material 40.
Is mounted in a state of protruding above the upper surface of the ceramic crucible 27 and the opening edge of the ceramic crucible 27. This carbon crucible 2
An opening 38 provided at the center of the partition plate 35 is loosely fitted to the protruding portion of the partition plate 8, and a gap is formed between the outer surface of the carbon crucible 28 and the opening 38 of the partition plate 35.
Further, the sprue 30 of the mold 29 mounted above the carbon crucible 28 has an inner diameter at the opening edge of the partition plate 3
5 is substantially equal to the opening 38 of the carbon crucible 28 and is larger than the outer diameter of the opening edge of the carbon crucible 28.
A gap similar to that between the carbon crucible 28 and the partition plate 35 is formed between the outer surface of the partition plate and the inner surface of the opening of the sprue 30, and a groove 36 formed on the surface of the partition plate 35 passes through these gaps. The inside of the sprue 30 of the carbon crucible 28 and the mold 29 communicates with the space inside the casting container 7. Further, in the example shown in the figure, the size of the inner diameter d is set to be smaller than the size of the inner diameter D of the carbon crucible 28 over a certain length from the rear end of the sprue 30 of the mold 29. The reason is that, when casting a metal, a large amount of metal is melted and cast into the volume of the cast product.
This is because the amount of metal to be used has a margin in order to reduce the failure due to insufficient casting as much as possible while taking into consideration shrinkage of the molten metal during solidification. For this reason,
Some of the molten metal cast into the mold 29 solidifies in the sprue 30. The surplus metal solidified in the sprue 30 can be reused as a casting material together with the metal solidified in the spool wire 33 at the tip of the surplus metal unless it is significantly altered in casting. However,
When the inner diameter of the sprue 30 is larger than the inner diameter of the carbon crucible 28, the lump of excess metal solidified in the sprue 30 becomes larger than the inner diameter of the carbon crucible 28, and when used again as a casting material. However, it cannot be put into the carbon crucible 28 as it is, and it takes time to crush it into small pieces. Therefore, as described above, the inner diameter d of the casting mold 29 is set to be smaller than the inner diameter D of the carbon crucible 28 over a certain length from the inner end of the sprue 30. It is possible to omit the above-mentioned trouble by setting the surplus metal that solidifies therein into the carbon crucible 28 as it is so as to be reused.
【００２１】以下、上記のような真空加圧鋳造装置を用
いた鋳造方法を説明する。まず、鋳造容器７内から鋳型
２９およびカーボンルツボ２８を取り外した状態で加熱
炉２３を加熱手段２６により予め加熱してセラミックス
ルツボ２７を所定の温度に上昇させておく。この予熱時
には、カーボンルツボ２８を装着したままでもよいが、
加熱による消耗をさけるためにカーボンルツボ２８は外
しておいた方がよい。また、この予熱の際にセラミック
スルツボ２７の上部開口部をセラミックス片等で塞いで
おけば、セラミックスルツボ２７の予熱を効率よく行う
ことができる。この予熱の温度は、鋳造に供する金属の
融点に応じて設定する。例えば、歯科用の金−銀−パラ
ジウム合金では９３０±３０℃程度、銀合金であれば７
００〜８００℃程度、またポーセレン用金合金は１２０
０〜１２８０℃程度、更にはコバルト−クロム合金であ
れば１３００〜１４００℃程度である。The casting method using the above vacuum pressure casting apparatus will be described below. First, with the mold 29 and the carbon crucible 28 removed from the casting container 7, the heating furnace 23 is preheated by the heating means 26 to raise the temperature of the ceramic crucible 27 to a predetermined temperature. During this preheating, the carbon crucible 28 may be left attached,
It is preferable to remove the carbon crucible 28 in order to avoid consumption due to heating. If the upper opening of the ceramic crucible 27 is closed with a ceramic piece or the like during this preheating, the ceramic crucible 27 can be efficiently preheated. The temperature of this preheating is set according to the melting point of the metal used for casting. For example, a gold-silver-palladium alloy for dental use is about 930 ± 30 ° C., and a silver alloy is 7
About 00-800 ℃, and gold alloy for porcelain is 120
The temperature is about 0 to 1280 ° C, and more preferably about 1300 to 1400 ° C for a cobalt-chromium alloy.
【００２２】次に、上記のように加熱炉２３内で予熱さ
れたセラミックスルツボ２７内にカーボンルツボ２８を
装着し、このカーボンルツボ２８内に鋳造する金属を投
入した後、カーボンルツボ２８の上方に鋳型２９を装着
して鋳造容器７の天蓋６を閉じる。このとき、鋳造容器
７の下壁部分に設けた通気口９は開閉蓋８により密閉さ
れており、鋳造容器７は気密状態となる。この状態で前
記カーボンルツボ２８内に投入した金属を加熱溶融す
る。この金属溶解時には、カーボンルツボ２８が加熱さ
れることで周囲の酸素と結合してＣＯ、ＣＯ2 に化学変
化し、この発生したガスによりカーボンルツボ２８内に
投入された金属と鋳造容器７内の空気とを遮断して空気
中の酸素による溶融金属の酸化を防止する。次に、前記
のようにして金属を溶融した後、基体１内に設けた真空
ポンプ１２により鋳造容器７内の空気その他のガスを排
気して鋳造容器７内を減圧状態とする。この場合の減圧
度は６０〜７０ｃｍＨｇ程度でよい。そして、このよう
に鋳造容器７内を排気するに伴って、該鋳造容器７上部
の天蓋６と下壁の通気口９を塞ぐ開閉蓋８とがシール部
材１７およびシール部材１８を介してより密着して、鋳
造容器７内を完全な気密状態とする。尚、この減圧操作
は、前記の金属溶融操作と平行して行うこともできる。
また、このように金属の溶融時に同時に鋳造容器７内を
排気して減圧する場合には、溶融金属Ｍの空気酸化をよ
り確実に防止することができる。この鋳造容器７内の排
気は数十秒で完了する。上記のようにしてカーボンルツ
ボ２８内の金属の溶融と鋳造容器７内の減圧操作が完了
した後、ギアモータ１１により回転軸５を１８０°回転
させることで鋳造容器７を上下に反転させると、この鋳
造容器７内のカーボンルツボ２８と鋳型２９との上下位
置が逆転して、図４に示すように上向開口状の鋳型２９
の上方に、該鋳型２９の湯口３０に相対して下向開口状
にカーボンルツボ２８が位置し、該カーボンルツボ２８
内の溶融金属Ｍが流下して湯口３０からスプール線３３
を経て鋳込空間２４内に鋳込まれる。このとき、図６、
図７に示すように、この鋳造容器７の反転動作に伴っ
て、鋳造容器７の下壁に設けた通気口９を塞いでいる開
閉蓋８先端の操作部２１が基体１の側面の回転軸５の上
方に設けたストッパーピン２２と係合し、前記操作部２
１に形成した傾斜辺２０がストッパーピン２２にそって
摺動して開閉蓋８の先端側を上方に押し上げ、通気口９
を開口して鋳造容器７内が大気に開放され、この通気口
９から鋳造容器７内に入った大気の圧力により鋳型２９
内に鋳込まれた溶融金属Ｍを加圧することで、鋳込不足
や鋳造製品内の気泡の発生を防止するのである。Next, the carbon crucible 28 is mounted in the ceramic crucible 27 preheated in the heating furnace 23 as described above, and the metal to be cast is put into the carbon crucible 28. Then, the carbon crucible 28 is placed above the carbon crucible 28. The mold 29 is attached and the canopy 6 of the casting container 7 is closed. At this time, the ventilation port 9 provided in the lower wall portion of the casting container 7 is closed by the opening / closing lid 8, and the casting container 7 is in an airtight state. In this state, the metal charged into the carbon crucible 28 is heated and melted. When the metal is melted, the carbon crucible 28 is heated to combine with the surrounding oxygen and chemically change into CO and CO 2. The generated gas causes the metal charged into the carbon crucible 28 and the inside of the casting container 7 to melt. It blocks air and prevents oxidation of molten metal by oxygen in the air. Next, after melting the metal as described above, the vacuum pump 12 provided in the substrate 1 exhausts air and other gases in the casting container 7 to bring the casting container 7 into a depressurized state. In this case, the degree of pressure reduction may be about 60 to 70 cmHg. As the interior of the casting container 7 is evacuated in this way, the canopy 6 on the upper part of the casting container 7 and the opening / closing lid 8 that closes the ventilation port 9 on the lower wall are more closely attached via the seal member 17 and the seal member 18. Then, the inside of the casting container 7 is made completely airtight. The depressurizing operation can be performed in parallel with the metal melting operation.
Further, when the interior of the casting container 7 is evacuated and the pressure is reduced at the same time when the metal is melted, it is possible to more reliably prevent the air oxidation of the molten metal M. The evacuation of the casting container 7 is completed in several tens of seconds. After the melting of the metal in the carbon crucible 28 and the depressurization operation in the casting container 7 are completed as described above, the rotating shaft 5 is rotated 180 ° by the gear motor 11 to turn the casting container 7 upside down. The upper and lower positions of the carbon crucible 28 and the mold 29 in the casting container 7 are reversed, and as shown in FIG.
Of the carbon crucible 28 is positioned above the mold and has a downward opening facing the sprue 30 of the mold 29.
The molten metal M in the inside flows down to the spool wire 33 from the sprue 30.
It is cast into the casting space 24 via the. At this time, as shown in FIG.
As shown in FIG. 7, with the reversing operation of the casting container 7, the operating portion 21 at the tip of the opening / closing lid 8 that closes the vent hole 9 provided in the lower wall of the casting container 7 has the rotary shaft on the side surface of the base body 1. 5 is engaged with a stopper pin 22 provided above
The slanted side 20 formed in 1 slides along the stopper pin 22 and pushes the tip side of the opening / closing lid 8 upward, and the ventilation port 9
To open the interior of the casting container 7 to the atmosphere, and the pressure of the atmosphere entering the casting container 7 through the vent 9 causes the mold 29
By pressurizing the molten metal M cast inside, insufficient casting and generation of bubbles in the cast product are prevented.
【００２３】尚、上記の金属の溶融から鋳込までの操作
は、全て電気的に制御して自動的に行うことができる
が、手動で行ってもよい。また、上記の実施例では、鋳
造容器７内にルツボ２８を装着した加熱炉２３と鋳型２
９とを固定しておき、鋳造容器７を固定した回転軸５を
中心として鋳造容器７を反転させることでルツボ２８と
鋳型２９との上下位置を逆転させて鋳込を行っている
が、鋳造容器７内のルツボ２８や鋳型２９のみを上下位
置逆転させるようにしてもよい。また、鋳造容器７の下
壁に設けた通気口９を自動的に開口する開蓋手段として
上記実施例では、通気口９を開閉する開閉蓋８の一端に
傾斜辺２０を形成した操作部２１を設けて鋳造容器７の
反転によってこの傾斜辺２０をストッパーピン２２へ係
合させることで通気口９が開口するように構成している
が、この通気口９、およびストッパーピン２２を設ける
位置はこの実施例に限定されるものではなく、鋳造容器
７の反転により両者が係合するような位置であればどこ
に設けてもよい。更には、この通気口９の開蓋手段も上
記のような機械的に開閉する構成のものではなく、鋳造
容器７の回転に合わせて電磁弁等を用いて開口させるよ
うにしてもよい。The above-mentioned operations from the melting of the metal to the casting can be all automatically controlled by electrical control, but may be performed manually. Further, in the above-described embodiment, the heating furnace 23 having the crucible 28 mounted in the casting container 7 and the mold 2
9 is fixed, and the casting container 7 is inverted about the rotating shaft 5 to which the casting container 7 is fixed, whereby the upper and lower positions of the crucible 28 and the mold 29 are reversed to perform casting. Only the crucible 28 and the mold 29 in the container 7 may be turned upside down. Further, in the above-described embodiment, as an opening means for automatically opening the vent hole 9 provided on the lower wall of the casting container 7, in the above-described embodiment, the operating portion 21 in which the inclined side 20 is formed at one end of the opening / closing lid 8 for opening / closing the vent hole 9 is provided. The ventilation port 9 is opened by engaging the inclined side 20 with the stopper pin 22 by reversing the casting container 7, and the position where the ventilation port 9 and the stopper pin 22 are provided is The present invention is not limited to this embodiment, and the casting container 7 may be provided at any position as long as they are engaged with each other by being turned over. Furthermore, the lid opening means for the vent hole 9 is not limited to the mechanical opening / closing mechanism as described above, but may be opened using an electromagnetic valve or the like in accordance with the rotation of the casting container 7.
【００２４】[0024]
【発明の効果】以上のように本発明によれば、真空加圧
鋳造方法として、減圧下の鋳造容器内で金属を加熱溶融
して鋳型内に鋳込むと同時に、鋳造容器の外壁に設けた
通気口を開口するようにしたことから、鋳込直後に鋳造
容器外の大気を速やかに鋳造容器内に導入して押し湯を
行うことができ、従来のようにコンプレッサー等の圧縮
空気供給手段を必要とせず、また鋳造容器内を高真空に
減圧する必要もなく、小型の真空ポンプで足りることか
ら、装置の構造が簡単で、また鋳造操作やメンテナンス
も容易で、しかも故障等の発生も少なく、更には装置の
製造コストも低減することができる、といった従来の鋳
造方法にない顕著な効果がある。As described above, according to the present invention, as a vacuum pressure casting method, a metal is heated and melted in a casting container under reduced pressure to be cast into a mold, and at the same time, it is provided on the outer wall of the casting container. Since the vent hole is opened, the atmosphere outside the casting container can be immediately introduced into the casting container immediately after casting, and hot water can be supplied, and compressed air supply means such as a compressor can be used as in the past. No need, no need to depressurize the casting container to a high vacuum, a small vacuum pump is enough, the structure of the device is simple, casting operation and maintenance are easy, and there are few failures. Moreover, there is a remarkable effect that the conventional casting method does not have, such that the manufacturing cost of the apparatus can be reduced.
【図１】 本発明に係る真空加圧鋳造装置の一例を示す
斜視図。FIG. 1 is a perspective view showing an example of a vacuum pressure casting apparatus according to the present invention.
【図２】 鋳造装置の一部を破断した平面図。FIG. 2 is a plan view in which a part of the casting device is broken away.
【図３】 鋳造装置の鋳造容器部分の縦断面図。FIG. 3 is a vertical sectional view of a casting container portion of the casting apparatus.
【図４】 鋳込時の鋳造装置の鋳造容器部分の縦断面
図。FIG. 4 is a vertical cross-sectional view of a casting container portion of the casting apparatus during casting.
【図５】 加熱炉、ルツボおよび鋳型部分の縦断面図。FIG. 5 is a vertical sectional view of a heating furnace, a crucible and a mold part.
【図６】 通気口の開口動作の説明図。FIG. 6 is an explanatory diagram of an opening operation of a vent.
【図７】 通気口の開口動作の説明図。FIG. 7 is an explanatory diagram of an opening operation of a vent.
【図８】 通気口の開口状態を示す要部の斜視図。FIG. 8 is a perspective view of a main part showing an opened state of a ventilation port.
１ 基体 ２ 基板 ３ 操作部 ４ 真空計 ５ 回転軸 ６ 天蓋 ７ 鋳造容器 ８ 開閉蓋 ９ 通気口 10 ベアリング 11 ギアモータ 12 真空ポンプ 13 パイプ 14 ヒンジ 15 ハンドル 16 ロック杆 17 シール部材 18 シール部材 19 ヒンジ 20 傾斜辺 21 操作部 22 ストッパーピン 23 加熱炉 24 金属リング 25 ルツボ装着部 26 加熱手段 27 セラミックスルツボ 28 カーボンルツボ 29 鋳型 30 湯口 31 金属リング 32 鋳型材 33 スプール線 34 鋳込空間 35 仕切板 36 凹溝 37 圧縮バネ 38 開口 40 断熱材 1 Base 2 Substrate 3 Operation Section 4 Vacuum Gauge 5 Rotating Shaft 6 Canopy 7 Casting Container 8 Opening / Covering 9 Vent 10 Bearing 11 Gearmotor 12 Vacuum Pump 13 Pipe 14 Hinge 15 Handle 16 Lock Rod 17 Sealing Member 18 Sealing Member 19 Hinge 20 Tilt Side 21 Operation part 22 Stopper pin 23 Heating furnace 24 Metal ring 25 Crucible mounting part 26 Heating means 27 Ceramic crucible 28 Carbon crucible 29 Mold 30 Gate 31 Metal ring 32 Mold material 33 Spool wire 34 Casting space 35 Partition plate 36 Recessed groove 37 Compression spring 38 Opening 40 Insulation
Claims (8)
造容器内で金属を加熱溶融するとともにこの鋳造容器内
を減圧し、溶融した金属を減圧下で鋳型内に鋳込むと同
時に前記鋳造容器外壁の通気口を開口して鋳造容器内を
大気に開放することを特徴とする真空加圧鋳造方法。1. A method of heating and melting a metal in an airtight casting container having an airtight opening in an outer wall thereof, depressurizing the casting container, and casting the molten metal into a mold under a reduced pressure. A vacuum pressure casting method, characterized in that the vent hole of the outer wall of the container is opened to open the inside of the casting container to the atmosphere.
ルツボを配し、前記ルツボの開口上方に、湯口をルツボ
の開口に相対して下向開口状に鋳型を配し、ルツボ内の
金属を加熱溶融し、金属の溶融後、前記ルツボと鋳型と
の位置を上下に逆転させてルツボ内の溶融金属を鋳型内
に鋳込むと同時に通気口を開口することを特徴とする請
求項１記載の真空加圧鋳造方法。2. A crucible is arranged in an upward opening shape in a lower part of an airtight casting container, and a casting mold is arranged above the opening of the crucible in a downward opening shape relative to the opening of the crucible. The metal inside is melted by heating, and after melting the metal, the positions of the crucible and the mold are reversed upside down, the molten metal in the crucible is cast into the mold, and at the same time, the vent is opened. Item 1. The vacuum pressure casting method according to Item 1.
密鋳造容器内に、ルツボと、該ルツボを装着する加熱
炉、および鋳型を設け、前記鋳造容器の外壁の適所に鋳
造容器外に連通する通気口を設けるとともに、該通気口
を密閉する開閉蓋を設けてなることを特徴とする真空加
圧鋳造装置。3. A crucible, a heating furnace in which the crucible is mounted, and a mold are provided in an airtight casting container which is connected to an exhaust means and can be hermetically sealed, and the crucible is placed outside the casting container at an appropriate position on the outer wall of the casting container. A vacuum pressure casting apparatus, characterized in that it is provided with a communicating vent and an opening / closing lid for sealing the vent.
口状に装着する加熱炉を設け、該加熱炉の上方には、湯
口をルツボの開口に相対させて下向開口状に鋳型を着脱
自在に装着するとともに、前記鋳造容器内のルツボと鋳
型との位置を上下逆転させる位置逆転手段を設け、前記
ルツボと鋳型との上下位置が逆転すると同時に該鋳造容
器の外壁の適所に設けた通気口の開閉蓋を開放する開蓋
手段を設けてなることを特徴とする請求項３記載の真空
加圧鋳造装置。4. A heating furnace for mounting the crucible in an upward opening shape is provided in a lower portion of the casting container, and a casting mold is formed in a downward opening shape above the heating furnace with the gate facing the opening of the crucible. And a position reversing means for vertically reversing the positions of the crucible and the mold in the casting container, and the upper and lower positions of the crucible and the mold being reversed, and at the same time being provided at a proper position on the outer wall of the casting container. The vacuum pressure casting apparatus according to claim 3, further comprising a lid opening means for opening the opening / closing lid of the ventilation port.
可能な回転軸に取り付け、前記鋳造容器を１８０°回転
させて上下に反転させることによりルツボと鋳型との位
置を上下に逆転させることを特徴とする請求項４記載の
真空加圧鋳造装置。5. A hermetically sealed casting container is attached to a rotary shaft capable of rotating at least 180 °, and the position of the crucible and the mold is reversed upside down by rotating the casting container 180 ° upside down. The vacuum pressure casting device according to claim 4.
ね、鋳造容器に開閉可能な天蓋を設け、該天蓋下面に鋳
造容器内に装着した鋳型を下方へ弾性付勢する付勢手段
を設けるとともに、前記鋳造容器の下壁の適所に該気密
鋳造容器を上下反転させた時に開放する開閉蓋により鋳
造容器の外部に連通する通気口を設けてなることを特徴
とする請求項５記載の真空加圧鋳造装置。6. A urging means for rotating a shaft also serving as an exhaust pipe connected to a pressure reducing means, having a canopy capable of being opened and closed in a casting container, and elastically urging a mold mounted in the casting container downward on the lower surface of the canopy. 6. A ventilation port communicating with the outside of the casting container is provided at an appropriate position on the lower wall of the casting container by an opening / closing lid that opens when the airtight casting container is turned upside down. Vacuum pressure casting equipment.
軸に鋳造容器を基体に対して上下反転可能に連結し、前
記鋳造容器の外壁に設けた通気口を開閉する開閉蓋の一
端を鋳造容器外壁に枢着し、開閉蓋の他端を鋳造容器か
ら基体の側壁方向へ突出させ、該突出部分に、回転軸を
中心とする回転方向に対して前上がり状に傾斜した傾斜
辺を有する操作部を設けるとともに、該操作部に対して
回転軸の反対側に位置する基体側壁部分に、鋳造容器を
上下反転させた時に前記操作部の傾斜辺に係合するスト
ッパーを設けてなることを特徴とする請求項５または請
求項６記載の真空加圧鋳造装置。7. An opening / closing lid for projecting a rotary shaft from a side wall of a base body, connecting the casting container to the base body so as to be able to be turned upside down with respect to the rotary shaft, and opening and closing a vent provided on an outer wall of the casting container. One end is pivotally attached to the outer wall of the casting container, the other end of the opening / closing lid is projected from the casting container toward the side wall of the base body, and the protruding portion is inclined forward ascending with respect to the rotation direction about the rotation axis. An operating portion having a side is provided, and a stopper that engages with the inclined side of the operating portion when the casting container is turned upside down is provided on the side wall portion of the base body located on the side opposite to the rotating shaft with respect to the operating portion. The vacuum pressure casting apparatus according to claim 5 or 6, wherein
口縁の外径より大きく設定するとともに、前記湯口奥部
の内径を湯口の奥端部から開口縁に向かって所定の長さ
にわたってルツボの内径よりも小さく設定してなること
を特徴とする請求項３または請求項４または請求項５ま
たは請求項６または請求項７記載の真空加圧鋳造装置。8. The inner diameter of the opening edge of the sprue of the mold is set to be larger than the outer diameter of the opening edge of the crucible, and the inner diameter of the back spout extends over a predetermined length from the rear end of the sprue toward the opening edge. The vacuum pressure casting apparatus according to claim 3, claim 4, claim 5, claim 6, or claim 7, wherein the inner diameter of the crucible is set smaller than the inner diameter of the crucible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30831692A JPH06126422A (en) | 1992-10-21 | 1992-10-21 | Vacuum pressurized casting method and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30831692A JPH06126422A (en) | 1992-10-21 | 1992-10-21 | Vacuum pressurized casting method and apparatus therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06126422A true JPH06126422A (en) | 1994-05-10 |
Family
ID=17979589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30831692A Pending JPH06126422A (en) | 1992-10-21 | 1992-10-21 | Vacuum pressurized casting method and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06126422A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6386265B1 (en) | 1998-12-14 | 2002-05-14 | Denken Co., Ltd. | Method of and apparatus for casting dental prosthesis |
| CN112756585A (en) * | 2020-12-28 | 2021-05-07 | 施佳 | Gypsum mould vacuum pouring pressurization solidification casting device |
-
1992
- 1992-10-21 JP JP30831692A patent/JPH06126422A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6386265B1 (en) | 1998-12-14 | 2002-05-14 | Denken Co., Ltd. | Method of and apparatus for casting dental prosthesis |
| CN112756585A (en) * | 2020-12-28 | 2021-05-07 | 施佳 | Gypsum mould vacuum pouring pressurization solidification casting device |
| CN112756585B (en) * | 2020-12-28 | 2022-08-16 | 韶关市曲江韶枫实业有限公司 | Gypsum mould vacuum pouring pressurization solidification casting device |
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