JPS62203661A - Casting device for metal - Google Patents

Casting device for metal

Info

Publication number
JPS62203661A
JPS62203661A JP4674886A JP4674886A JPS62203661A JP S62203661 A JPS62203661 A JP S62203661A JP 4674886 A JP4674886 A JP 4674886A JP 4674886 A JP4674886 A JP 4674886A JP S62203661 A JPS62203661 A JP S62203661A
Authority
JP
Japan
Prior art keywords
pressure
molten metal
mold
casting
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4674886A
Other languages
Japanese (ja)
Inventor
Noboru Morita
昇 森田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YOSHIDA KIYASUTO KOGYO KK
Original Assignee
YOSHIDA KIYASUTO KOGYO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by YOSHIDA KIYASUTO KOGYO KK filed Critical YOSHIDA KIYASUTO KOGYO KK
Priority to JP4674886A priority Critical patent/JPS62203661A/en
Publication of JPS62203661A publication Critical patent/JPS62203661A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To quickly substitute the air in a casting mold with a molten metal and to finish a casting to the good quality even in the fine parts thereof by pouring the heated molten metal in a pressure variable vessel into the casting mold which is gently applied with fine oscillation under the reduced pressure and pressurizing the inside of the vessel after pouring. CONSTITUTION:The metal in a crucible 15 of a melting device 14 in the pressure vessel 11 in which the reduced pressure is maintained is heated and melted by a high-frequency coil 16. The crucible 15 is tilted to pour the molten metal into the casting mold 19 which exists on a U-shaped metallic plate 1 and is oscillated at about 0.1-1.0mm amplitude and about 30-120Hz oscillation frequency by an electromagnetic coil 2. The molten metal is quickly and thoroughly substd. with the air in the cavity 20 of the casting mold 10 by such oscillation. The amt. pressure in the pressure vessel 11 is thereafter pressurized to about 1-4kg/cm<2> to solidify the molten metal. The molten metal is filled even to the fine parts of the cavity 20 in the casting mold 19 and the quality of the casting product is improved by the subsequent solidification under the pressurization.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は鋳造装置に係り、更に詳述すれば減圧下で鋳
型内に注湯すると共に該鋳型に振動を加えwA廻り不良
を減少させるようにした金属鋳造装置に関するものであ
る。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a casting device, and more specifically, a method for pouring metal into a mold under reduced pressure and applying vibration to the mold to reduce defects around wA. The invention relates to metal casting equipment.

[従来の技術] 一般にロストワックス鋳造法では、積層した薄肉の鋳型
(セラミック、シェルモールド)に溶湯を重力で鋳込む
ものであるが、形状が複雑で薄肉の小物鋳物では「湯廻
り不良」の発生率が高いために、ブロックモールドによ
って溶湯に人工的加圧を施すことが多い。
[Conventional technology] Generally, in the lost wax casting method, molten metal is cast by gravity into stacked thin-walled molds (ceramic, shell mold), but small castings with complex shapes and thin walls have a high incidence of "poor flow". Because of the high pressure, artificial pressure is often applied to the molten metal using block molding.

それでも、このような小物鋳物(例えば厚さ0.3am
、幅51101%長さ15In@)では「S廻り不良」
の発生率が高いために、その歩留りの向上と内、外部欠
陥の防止による質的向上が、問題になっている。
Still, such small castings (e.g. 0.3am thick)
, Width 51101% Length 15In @) "Defect around S"
Due to the high incidence of defects, it has become a problem to improve the yield and the quality by preventing internal and external defects.

歩留りを向上するための鋳込能力については、組立方案
、合金の組成、鋳型温度、鋳込み温度、圧力の起上り角
度、圧力の最大値、鋳型の通気性等の項目が集中的に管
理されている。
Regarding casting ability to improve yield, items such as assembly plan, alloy composition, mold temperature, casting temperature, pressure rise angle, maximum pressure value, mold air permeability, etc. are centrally managed. There is.

この中でも、鋳型の通気性は鋳込能力の影響に寄与する
ので重要であることが知られている。
Among these, the air permeability of the mold is known to be important because it contributes to the influence of casting ability.

通気性とは、鋳込まれた鋳型空洞内の空気、ガスは通気
性のある鋳型壁より排出するが、人為的なベントまたは
溶湯の通路であるスプール(湯道〉より逆に排出して溶
湯と置換する排出口である。しかしながら、十分に空気
やガスが排出されなければ圧縮されて、溶湯内に潜入し
たり、バックプレッシャー(背圧)となって溶湯の注入
速度に著しい影響を及ぼし、その結果として、外部欠陥
(湯廻り不良)内部欠陥(内用は巣)の原因となる。
Air permeability means that the air and gas in the mold cavity are discharged through the permeable mold wall, but they are also discharged from the spool (runway), which is an artificial vent or passage for the molten metal. However, if air and gas are not sufficiently exhausted, they will be compressed and may enter the molten metal or create back pressure, which will significantly affect the molten metal injection speed. As a result, this causes external defects (poor water circulation) and internal defects (internal defects).

そこで、組立方案、鋳型の不良分布、結合材の種類、混
液比、鋳型温度圧力く気体)の方向性等が管理されるが
、他の諸条件とからんで実際の作業上では計数的に把握
することが極めて難しい問題となっている。
Therefore, the assembly plan, mold defect distribution, type of binder, liquid mixture ratio, directionality of mold temperature, pressure, gas, etc. are controlled, but in conjunction with other conditions, they can be understood numerically during actual work. This has become an extremely difficult problem.

鋳込みは「静かに手早く」と−口に言われるが、これは
溶湯をはげしく鋳込むと層流から乱流となり巻込み、崩
れの原因となるためで、従って、特定の場合を除いて重
力の鋳込みが一般的に行なわれている。
It is said that pouring should be done quietly and quickly, but this is because when pouring molten metal too vigorously, the laminar flow turns into turbulent flow, which can cause engulfment and collapse. Casting is commonly performed.

しかしながら、小物鋳物では前述のような理由から、人
工的加圧は不可欠であるために、いかに「静かに」注湯
するか、多くの試みがなされ、現在の加圧法で主流をな
す2つの加圧法について説明する。
However, for the reasons mentioned above, artificial pressure is indispensable for small castings, and many attempts have been made to find out how to "quietly" pour the metal. The pressure method will be explained.

その1つである遠心鋳造法は古くから利用されてきた一
例として、その構成を説明すると、溶解装置と鋳型が対
向してバーの一端に、他端にバランスウェイトがそれぞ
れ設置され、このバーが回転駆動すると、慣性の運動で
溶解装置のルツボより溶湯が飛びだして鋳型の湯口に激
突して鋳型内に注入収納し、連続的な遠心力で鋳型空洞
内に溶湯を満すもので、構造的には極めて簡単で容易に
圧力を畢ることかできる。
One of these methods, the centrifugal casting method, has been used for a long time.To explain its structure, a melting device and a mold face each other, and a balance weight is installed at one end of a bar and a balance weight at the other end. When driven in rotation, the molten metal flies out of the crucible of the melting device due to inertial motion, collides with the sprue of the mold, and is injected into the mold, filling the mold cavity with continuous centrifugal force. It is extremely simple and easy to apply pressure.

この方法の特徴は、飛んで来た溶湯は鋳型の湯口部でバ
ウンドし、空洞部の空気は遠心力の影響を受けないので
鋳型壁より排出したり、湯道側を逆に通って湯口部より
外部へ排出される。
The feature of this method is that the flying molten metal bounces at the sprue of the mold, and the air in the cavity is not affected by centrifugal force, so it can be discharged from the mold wall or passed backwards through the runner to the sprue. is discharged to the outside.

そのため鋳型の通気度に影響を受けることが極めて少な
く、通気性のない鋳型でも鋳込率を高く鋳込める発表が
ある。
Therefore, it is extremely unaffected by the air permeability of the mold, and there have been reports that it is possible to cast at a high pour rate even in molds without air permeability.

したがって、湯廻り不良等の発生率が極めて低く、中高
融合金を問わず、鋳造することが可能である反面、遠心
力の方向に組立方案が決定づけられ、圧力のコントロー
ルが管理しにくいのと、乱流による欠陥の発生が高いと
云う欠点がある。
Therefore, the incidence of problems such as poor circulation is extremely low, and it is possible to cast any medium or high-grade alloy, but on the other hand, the assembly method is determined by the direction of centrifugal force, making pressure control difficult to manage. The disadvantage is that the occurrence of defects due to turbulence is high.

これらの欠”点を補正するために加圧鋳造法がある。そ
の−例を第2図(ω、(b)を用いて説明する。
In order to correct these shortcomings, there is a pressure casting method. An example thereof will be explained using FIG. 2 (ω, (b)).

この加圧鋳造装置10は、第2図(Jに示すように覗窓
12および加圧口13を設けた圧力容器11内に溶融ル
ツボ15を高周波加熱コイル16とで構成された溶解装
置14と、その設置位置を可変できるようにスクリュー
シャフト17上の置台18上に鋳型19が縦方向に配設
されたものである。
This pressure casting device 10 includes a melting device 14 that includes a melting crucible 15 and a high-frequency heating coil 16 in a pressure vessel 11 provided with a viewing window 12 and a pressurizing port 13 as shown in FIG. 2 (J). A mold 19 is vertically disposed on a stand 18 on a screw shaft 17 so that its installation position can be varied.

まず、溶融ルツボ15内に小、中融合金を入れ高周波コ
イルに高周波電流を流す等して加熱源16を加熱し、ル
ツボ内の合金を溶融せしめ、次に予熱された鋳型19を
置台18上に冒いてから、圧力容器11の蓋を閏じ、加
圧口13より内部の空気を外部に吸引して圧力容器11
内を減圧し、鋳型内の背圧抵抗を減じてから第2図(b
)に示すように溶融ルツボ15を転倒して溶湯を重力に
よって静かに鋳型19の湯口より鋳型内に流し込んだ後
、圧力容器11肉に加圧口13より加熱した空気を吹込
み容器内圧力を上げて鋳込みを行なう。
First, a small or medium alloy is placed in the melting crucible 15 and a high frequency current is passed through a high frequency coil to heat the heating source 16 to melt the alloy in the crucible. Next, the preheated mold 19 is placed on the table 18. After the air is exposed to air, the lid of the pressure vessel 11 is opened, and the air inside is sucked out from the pressurization port 13 to remove the pressure vessel 11.
After reducing the pressure inside the mold and reducing the back pressure resistance inside the mold,
), after the melting crucible 15 is overturned and the molten metal is gently poured into the mold from the sprue of the mold 19 by gravity, heated air is blown into the pressure vessel 11 from the pressurizing port 13 to increase the internal pressure of the vessel. Raise it and perform casting.

この方法の長所は、溶湯の乱流が少なく、圧力に方向性
がないため、組立方案に自由度があり、圧力の立上り角
度、圧力のピーク値を任意にコントロールできるので中
層合金の鋳込みでは主流である。
The advantages of this method are that there is little turbulence in the molten metal and there is no directionality in the pressure, so there is a degree of freedom in the assembly method, and the pressure rise angle and pressure peak value can be controlled arbitrarily, so it is the most popular method for casting middle-layer alloys. It is.

[発明が解決しよう−とする問題] しかし、この方法は内部欠陥は極めて少ないが、空洞部
は湯口が満された時点で湯道側を通って空気が排出しに
くいので、鋳型の通気性の管理を始めとして鋳型温度、
鋳込温度の管理が必要である。
[Problem to be solved by the invention] However, although this method has very few internal defects, it is difficult for air to escape through the runner side when the sprue is filled in the cavity, so the air permeability of the mold is affected. Starting with control, mold temperature,
It is necessary to control the casting temperature.

更に、この加圧法は今日、高融点合金、凝固温度範囲の
狭い合金で粘性係数の高い白金、チタン合金では外部欠
陥の発生率が高く、多くの問題点が指摘されている。
Furthermore, many problems have been pointed out in this pressurizing method today, such as a high incidence of external defects in high melting point alloys, alloys with a narrow solidification temperature range, and platinum and titanium alloys with high viscosity coefficients.

[発明の目的] この発明は加圧鋳造法に伴う前述した欠点を解決するこ
とを目的とし、加圧鋳造法の特徴を最大限に活用し、か
つ不良率の発生をおさえて良質の鋳物を得るための装置
を提供するものである。
[Purpose of the Invention] The purpose of the present invention is to solve the above-mentioned drawbacks associated with the pressure casting method, and to make the most of the characteristics of the pressure casting method and to suppress the occurrence of defective products to produce high-quality castings. The present invention provides an apparatus for obtaining the results.

[発明の概要] この発明の鋳造装置は前記目的を達成するために、減圧
した圧力容器内で材料金属を溶融せしめたあと前記容器
内の予熱された鋳型に微振動を加えつつ前記溶融金属を
鋳型に注湯し、この注湯の完了後、前記圧力容器内を加
圧せしめると共に、鋳型内の溶湯が凝固するまで鋳型に
加えている振動を継続せしめることにあり、さらに具体
的にはこの発明の鋳型装コは、内部圧力を加減し得る圧
力可変容器と、該容器内に収容され加熱源で加熱される
金属溶融ルツボと、予熱されて前記容器内に入れられた
鋳型に微振動を付加する低周波振動付加装置とで構成さ
れたものである。
[Summary of the Invention] In order to achieve the above object, the casting apparatus of the present invention melts a material metal in a pressure-reduced pressure vessel, and then melts the molten metal while applying slight vibrations to a preheated mold in the vessel. The purpose of this method is to pour metal into the mold, and after completing the pouring, pressurize the inside of the pressure vessel and continue the vibration applied to the mold until the molten metal in the mold solidifies. The mold equipment of the invention includes a variable pressure container capable of adjusting internal pressure, a metal melting crucible housed in the container and heated by a heat source, and a preheated mold placed in the container that is subjected to slight vibrations. It consists of a low-frequency vibration adding device.

[発明の実施例] この発明の金属の鋳造装置を実施するには第1図(ω、
 +b)に示すように圧力容器11内底部に、U字状に
曲げた磁性と弾性とを有する金属板1の一端における下
板とコイル2を巻回したコア3とを重ねてボルト4で固
定し、前記金属板1の上板に一面に鋳型19を嵌着し得
るように鋳型に合せて突出させた取付鍔5を形成した鋳
型載せ台6をボルト7で固定した振動付加装置8を取付
け、前記コイルに導線9を介して交番電流や脈流を印加
しくqるようにした高融点金属の鋳造装置を用いて実施
する。
[Embodiments of the Invention] In order to carry out the metal casting apparatus of this invention, FIG. 1 (ω,
As shown in +b), the lower plate at one end of the magnetic and elastic metal plate 1 bent into a U-shape and the core 3 around which the coil 2 is wound are stacked on the inner bottom of the pressure vessel 11 and fixed with bolts 4. Then, a vibration adding device 8 is attached to the upper plate of the metal plate 1, in which a mold mounting table 6 is fixed with bolts 7, and a mold mounting base 6 is formed with a mounting flange 5 that protrudes in accordance with the mold so that the mold 19 can be fitted on one side of the upper plate of the metal plate 1. This is carried out using a high-melting point metal casting apparatus in which an alternating current or pulsating current is applied to the coil through a conductive wire 9.

[発明の作用] この発明の高融点金属の鋳造装置は以上の如く構成され
ており、以下この装置を用いて、この発明の鋳造方法に
ついて述べる。
[Operation of the Invention] The high melting point metal casting apparatus of the present invention is constructed as described above, and the casting method of the present invention will be described below using this apparatus.

先ず、この発明の方法に入る前に加圧法では溶1aを湯
口に注入した時点で空洞が密閉されるので、遠心法のよ
うに鋳型的空洞の空気は湯道側に排出される率が極めて
低く、且つ高融点合金の鋳造では、鋳型温度が高< (
900〜1600℃)このため空洞内の表層部が結合材
によって焼結するため通気性が減じ、また高温の溶湯(
1650〜1900℃)による空気の急膨張等によって
鋳型壁からの排出が著しく劣って背圧抵抗が大きくなり
、これが高融点合金の鋳込率を低下する原因であった。
First, before starting the method of this invention, it is important to note that in the pressurized method, the cavity is sealed when the melt 1a is poured into the sprue, so the air in the mold-like cavity is extremely unlikely to be discharged to the runner side, as in the centrifugal method. In casting low and high melting point alloys, the mold temperature is high < (
900-1600℃) As a result, the surface layer inside the cavity is sintered by the binder, reducing air permeability and preventing high-temperature molten metal (
Due to the sudden expansion of air caused by 1,650 to 1,900°C), the discharge from the mold wall was significantly impaired, resulting in a large back pressure resistance, which was the cause of a decrease in the casting rate of high melting point alloys.

この発明では従来の加圧法に加えて、鋳込前に振動付加
装置8を介して鋳型19に振動エネルギを与えて、鋳型
19を振動させることにより、鋳型19の空洞20内に
有る空気を湯口より空洞20内に侵入する溶WAaと素
早く置換させることによって空洞20内の背圧抵抗を減
じて鋳込能力を高めることと細かい鋳造品を美しい仕上
りで得ることを特徴とする。すなわち本発明の要旨は空
洞20の内面の振動と溶laとの微細衝突作用で空洞2
0内の空気を積極的かつ迅速に湯口から排除することに
なる。
In addition to the conventional pressurizing method, this invention applies vibration energy to the mold 19 via the vibration adding device 8 before casting to vibrate the mold 19, thereby removing air in the cavity 20 of the mold 19 from the sprue. It is characterized by quickly displacing the molten WAa that penetrates into the cavity 20, thereby reducing the back pressure resistance within the cavity 20, increasing the casting ability, and obtaining a fine cast product with a beautiful finish. In other words, the gist of the present invention is that the cavity 2
The air in the 0 will be actively and quickly removed from the sprue.

次に、このような特徴を有する鋳造方法を工程順に説明
する。
Next, a casting method having such characteristics will be explained step by step.

鋳造に当り、圧力容器11内に加圧口13より容器内に
圧縮空気3〜5に97cmとし、圧力容器11内の溶融
ルツボ15内に入れた金属(高融点金属)を高周波加熱
コイルに高周波電流を印加する等して加熱源16を加熱
し予熱して振動付加装置8の鋳型載せ台6上に載置しで
ある鋳型19に、圧力容器11内を40〜65tlQ1
0++に減圧して溶融して得た溶湯を、第1回出)に示
すように前記鋳型19を振動付加装置8により振幅0.
1〜1.0m、振動数30〜120HZの振動を付加し
つつ注湯し、注湯後は圧力容器11内を1〜4に9/a
lに加圧し、鋳型19内に注湯した溶湯が凝固するまで
前記した振動と容器内圧力を維持し、凝固し終ったら容
器内圧力を大気圧に戻すと共に振動付加装置8を停止し
て鋳型19を容器外に取出す。
During casting, compressed air is injected into the pressure vessel 11 from the pressurizing port 13 to a depth of 97 cm, and the metal (high melting point metal) placed in the melting crucible 15 in the pressure vessel 11 is heated by a high frequency heating coil. The heating source 16 is heated and preheated by applying an electric current, etc., and the inside of the pressure vessel 11 is heated by 40 to 65 tlQ1 to the mold 19, which is placed on the mold mounting table 6 of the vibration adding device 8.
The molten metal obtained by melting it under reduced pressure to 0++ is applied to the mold 19 with an amplitude of 0.
The metal is poured while applying vibrations of 1 to 1.0 m and a frequency of 30 to 120 Hz, and after pouring, the inside of the pressure vessel 11 is heated to 9/a from 1 to 4.
The vibration and the pressure inside the container are maintained until the molten metal poured into the mold 19 solidifies, and when the solidification is finished, the pressure inside the container is returned to atmospheric pressure, the vibration applying device 8 is stopped, and the mold is removed. Take out No. 19 from the container.

なお振動付加装置8としては前記実施例の電磁式のもの
以外にモータドライブカムやクランク式のメカ的振動付
加手段も本発明に当然用いることができる。
As the vibration applying device 8, in addition to the electromagnetic type in the above embodiment, a motor drive cam or a crank type mechanical vibration applying means can of course be used in the present invention.

[発明の効果] 以上述べたようにこの発明は内部圧力を加減し得る圧力
可変容器と、該容器内に収容された高周波コイル等の加
熱源と、該加熱源で加熱される金属溶融ルツボと、予熱
されて前記容器内に入れられた鋳型に微振動を付加する
低周波振動付加装置とで構成したので、溶湯が湯口に注
ぎ込まれる際空洞部内面の振動作用によって空洞部内の
空気が湯道側を通って湯口から外部に迅速に排除され溶
湯と素早く買換するので、空洞部内における空気による
背圧が溶湯の流入に対して逆圧として邪魔しなくなり高
融点金属でも細かい鋳造が素早くできると共に、流入速
度は加圧力と振動程度に比例して速かで細部仕上りが美
しい鋳込みが容易に行なわれ、構造的にも簡単である等
の効果を有する。
[Effects of the Invention] As described above, the present invention provides a variable pressure container capable of adjusting internal pressure, a heating source such as a high frequency coil housed in the container, and a metal melting crucible heated by the heating source. , and a low-frequency vibration adding device that applies minute vibrations to the preheated mold placed in the container, so that when the molten metal is poured into the sprue, the air inside the cavity is blown away by the vibration of the inner surface of the cavity. Since it is quickly removed from the sprue to the outside through the side and quickly replaced with molten metal, the back pressure caused by the air inside the cavity does not interfere with the inflow of molten metal as a counter pressure, and even high-melting point metals can be cast quickly and finely. The inflow speed is proportional to the pressing force and the degree of vibration, so casting with beautiful detailed finish is easily performed, and the structure is simple.

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

第1図(a)および第1図(b)はそれぞれ本発明の一
実施例である高融点金属の鋳造装置の要部の構成図、第
2図(ωおよび第2図(b)は本発明を実施する従来の
加圧鋳造装置の構成と鋳造過程を示す図である。 8・・・振動付加装置、11・・・圧力可変容器、14
・・・溶解装置、15・・・金属溶融ルツボ、16・・
・高周波コイル等の加熱源、19・・・鋳型。 第1図(ム) i71igI俸) 第2図(の) gIJ2図(()
Figures 1(a) and 1(b) are block diagrams of the main parts of a high-melting point metal casting apparatus, which is an embodiment of the present invention, respectively, and Figure 2(ω) and Figure 2(b) are It is a diagram showing the configuration and casting process of a conventional pressure casting apparatus for carrying out the invention. 8... Vibration adding device, 11... Variable pressure container, 14
... Melting device, 15... Metal melting crucible, 16...
・Heating source such as high frequency coil, 19...Mold. Figure 1 (mu) i71igI salary) Figure 2 (of) gIJ2 figure (()

Claims (1)

【特許請求の範囲】[Claims] 内部圧力を加減し得る圧力可変容器と、該容器内に収容
された高周波コイル等の加熱源と、該加熱源で加熱され
る金属溶融ルツボと、予熱されて前記容器内に入れられ
た鋳型に微振動を付加する低周波振動付加装置とで構成
されていることを特徴とする金属の鋳造装置。
A variable pressure container that can adjust the internal pressure, a heating source such as a high frequency coil housed in the container, a metal melting crucible heated by the heating source, and a preheated mold placed in the container. 1. A metal casting device comprising: a low-frequency vibration adding device that adds minute vibrations.
JP4674886A 1986-03-04 1986-03-04 Casting device for metal Pending JPS62203661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4674886A JPS62203661A (en) 1986-03-04 1986-03-04 Casting device for metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4674886A JPS62203661A (en) 1986-03-04 1986-03-04 Casting device for metal

Publications (1)

Publication Number Publication Date
JPS62203661A true JPS62203661A (en) 1987-09-08

Family

ID=12755950

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4674886A Pending JPS62203661A (en) 1986-03-04 1986-03-04 Casting device for metal

Country Status (1)

Country Link
JP (1) JPS62203661A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269564A (en) * 1992-03-24 1993-10-19 Inax Corp Method and device for pressurized casting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630110A (en) * 1979-08-20 1981-03-26 Hitachi Chem Co Ltd Optical fiber connector
JPS596739A (en) * 1982-07-02 1984-01-13 Hitachi Ltd Rotor for rotary electric machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630110A (en) * 1979-08-20 1981-03-26 Hitachi Chem Co Ltd Optical fiber connector
JPS596739A (en) * 1982-07-02 1984-01-13 Hitachi Ltd Rotor for rotary electric machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269564A (en) * 1992-03-24 1993-10-19 Inax Corp Method and device for pressurized casting

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