JPS5916664A - Low pressure casting device - Google Patents
Low pressure casting deviceInfo
- Publication number
- JPS5916664A JPS5916664A JP12604482A JP12604482A JPS5916664A JP S5916664 A JPS5916664 A JP S5916664A JP 12604482 A JP12604482 A JP 12604482A JP 12604482 A JP12604482 A JP 12604482A JP S5916664 A JPS5916664 A JP S5916664A
- Authority
- JP
- Japan
- Prior art keywords
- stalk
- pressure
- furnace
- mold
- casting
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、鋳込の進行によって常に一定の加圧力を与え
均一な品質の鋳物を安定的に鋳造するための低圧鋳造装
置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-pressure casting apparatus for stably casting castings of uniform quality by constantly applying a constant pressing force as pouring progresses.
従来、低圧鋳造装置においては、一定一の溶湯を保持す
る保温炉の上方に鋳型を配置し、該鋳型の湯口と保温炉
内溶湯とを鋳込管、すなわちストークで連結し、保温炉
を気密構造として保温炉内空間を加圧することにより鋳
型中に溶湯を押上げ鋳造するが、鋳込の進行とともに保
温炉内WJmmが減少するので、一定の加圧力では所定
の押湯圧が得られないという問題があった。Conventionally, in low-pressure casting equipment, a mold is placed above an insulating furnace that holds a constant amount of molten metal, and the sprue of the mold and the molten metal in the insulating furnace are connected by a casting pipe, that is, a stalk, to keep the insulating furnace airtight. As a structure, the molten metal is pushed up and cast into the mold by pressurizing the space inside the heat retention furnace, but as the casting progresses, the WJmm inside the heat retention furnace decreases, so the predetermined feeder pressure cannot be obtained with a constant pressurizing force. There was a problem.
このため、通常鋳込毎に一定圧力だけ保温炉内空間の加
圧力を増加させる方法がとられているが、溶湯補給後の
一回目の鋳込では初期圧力が不定となり、また炉内での
スラグの付着等によって一定圧力の増加では押湯圧を一
定に保持できないという問題があった。For this reason, a method is usually used to increase the pressurizing pressure in the space inside the heat-retaining furnace by a constant pressure every time it is poured.However, in the first pour after replenishing molten metal, the initial pressure is unstable and There was a problem in that the feeder pressure could not be maintained constant by increasing the constant pressure due to the adhesion of slag, etc.
さらに、通常鋳型は金型で構成され、型開閉機構も含め
て重鎖の大きな構造物となり、これを瀾もれを防止する
ために保温炉との芯出しを行ないながら保温炉上方にセ
ットし、比較的構造上弱いストークを介して鋳型と保温
炉とを連結することは、構造上、作業上容易なことでは
なかった。Furthermore, a mold is usually composed of a metal mold, which is a large heavy chain structure including a mold opening/closing mechanism, and is set above the insulating furnace while being centered with the insulating furnace to prevent leakage. However, it has not been easy to connect the mold and the insulating furnace through a stalk, which is relatively structurally weak, from a structural and operational standpoint.
本発明は、上記の問題を解決するために、保温炉内の溶
湯量の多少にかかわらず常に一定の鋳込速さ、押湯圧を
実現させ、かつ鋳型の保温炉へのセットの位置精度を緩
和させて取付けを容易ならしめることを目的とするもの
である。In order to solve the above problems, the present invention realizes constant casting speed and feeder pressure regardless of the amount of molten metal in the incubation furnace, and also achieves positional accuracy in setting the mold in the incubation furnace. The purpose is to ease the problem and make installation easier.
この目的を達成するために、本発明の低圧鋳造装置にお
いては、ストークが2分割構成となっており、一方のス
トークが鋳型側に、他方のストークが保温炉側に取付け
られる。この場合、保温炉側ストークは鋳型側ストーク
に比べて管径が大となっており、保温炉側ストークは鋳
型側ストーク内に上端から下方に向けて挿入される。そ
して、保温炉側に取付けられた大径ストークと鋳型湯口
との間は小径ストークの周囲に配設された伸縮継手によ
り気密に連結される。In order to achieve this object, in the low-pressure casting apparatus of the present invention, the stalk is divided into two parts, one stalk being attached to the mold side and the other stalk being attached to the insulating furnace side. In this case, the insulating furnace-side stalk has a larger pipe diameter than the mold-side stalk, and the insulating furnace-side stalk is inserted into the mold-side stalk from the upper end downward. The large-diameter stalk attached to the heat-retaining furnace side and the mold sprue are airtightly connected by an expansion joint disposed around the small-diameter stalk.
鋳込時に溶湯上面上に小径ストーク外周と伸縮継手およ
び大径ストークの内周との間に密閉ガス空間が形成され
るが、該空間部位には圧力検出装置が接続され、検出圧
力は保温炉への加圧ガス供給系にフィードバックされる
。したがって、前記密閉空間部の圧力が一定となるよう
に制御することにより、一定の鋳込速さ、押湯圧を実現
できる。また、ストークが2分割構成となっているので
、鋳型側の小径ストークが保温側の大径ストークと干渉
しない範囲で鋳型を位置ずれをもって保温炉上方に設置
することができ、位置決め精度が緩和されて結合作業も
容易化され、所期の目的が達成される。During pouring, a sealed gas space is formed on the upper surface of the molten metal between the outer periphery of the small-diameter stalk and the inner periphery of the expansion joint and large-diameter stalk. is fed back to the pressurized gas supply system. Therefore, by controlling the pressure in the closed space to be constant, constant casting speed and feeder pressure can be achieved. In addition, since the stalk is divided into two parts, the mold can be installed above the heating furnace with a misalignment within the range where the small-diameter stalk on the mold side does not interfere with the large-diameter stalk on the insulation side, which reduces positioning accuracy. This simplifies the joining process and achieves the desired purpose.
以下に、本発明の低圧鋳造装置の望ましい実施例を図面
を参照して説明する。Preferred embodiments of the low pressure casting apparatus of the present invention will be described below with reference to the drawings.
第1図は本発明の一実施例装置を示している。FIG. 1 shows an embodiment of the present invention.
図中、1は気密構造を有する保温炉で、上部は11aに
よって覆われている。保温炉1の上方には鋳型取付部材
2が設けられており、この鋳型取付部材2上に鋳造用の
鋳型3が設置される。In the figure, 1 is a heat-retaining furnace having an airtight structure, and the upper part is covered with 11a. A mold mounting member 2 is provided above the heat retention furnace 1, and a casting mold 3 for casting is installed on this mold mounting member 2.
保温炉1の蓋1aには下方に向かって垂下する鋳込管、
ずなわちス]・−り4が取付けられている。このストー
ク4は比較的大径の管から成3−
る大径ストークに構成されている。一方、鋳型3の鋳型
湯口には比較的小径の小径ストーク5が取付けられてお
り、小径ストーク5の下端は、大径ストーク4の上端の
内部に下方に向かって挿入されている。これら大径スト
ーク4と小径ストーク5から成る二重複合ストークによ
って溶湯を鋳型3に導くストークが構成される。The lid 1a of the heat retention furnace 1 has a casting pipe hanging downward,
4 is installed. The stalk 4 is constructed from a relatively large-diameter tube. On the other hand, a relatively small-diameter stalk 5 is attached to the mold sprue of the mold 3, and the lower end of the small-diameter stalk 5 is inserted downward into the upper end of the large-diameter stalk 4. A double composite stalk consisting of the large-diameter stalk 4 and the small-diameter stalk 5 constitutes a stalk that guides the molten metal to the mold 3.
また、小径ストーク5の周囲には伸縮継手6が配設され
ている。伸縮継手6はたとえば金属ベローズから成り、
大径ストーク4の上端フランジと鋳型取付部材2とを気
密に連結している。Further, an expansion joint 6 is arranged around the small diameter stalk 5. The expansion joint 6 consists of a metal bellows, for example,
The upper end flange of the large diameter stalk 4 and the mold mounting member 2 are airtightly connected.
保温炉1内の溶湯7がストーク4.5を通って鋳型3内
に押上げられる際、小径ストーク5外周にあるガスは逃
げ場がないので、小径ストーク5の外周面と、伸縮継手
6および大径ストーク4の内周面と、溶湯上面とで囲ま
れた空間は密閉空間8を形成する。この密閉空間8部位
には、圧力検出導管9が開口しており、該部位8の圧力
は圧力検出装[10、たとえば圧力スイッチ10に導か
れる。When the molten metal 7 in the insulating furnace 1 is pushed up into the mold 3 through the stalk 4.5, the gas around the outer circumference of the small diameter stalk 5 has no place to escape, so the outer circumferential surface of the small diameter stalk 5, the expansion joint 6 and the large A space surrounded by the inner peripheral surface of the diameter stalk 4 and the upper surface of the molten metal forms a sealed space 8. A pressure detection conduit 9 opens into the sealed space 8, and the pressure in the region 8 is guided to a pressure detection device [10, for example a pressure switch 10].
4−
11は保温炉1への加圧用気体連絡口で、加圧用気体1
1112に接続している。加圧用気体配管の途中には給
気弁13および排気弁14が設けられている。15はタ
イマリレー等で構成される鋳込制御盤である。前記の圧
力スイッチ10の信号は加圧系、たとえば給気弁13に
フィードバックされており、密閉空間8の圧力が一定と
なるように加圧ガスの供給量を制御するようになってい
る。4-11 is a pressurizing gas communication port to the heat retention furnace 1, and the pressurizing gas 1
Connected to 1112. An air supply valve 13 and an exhaust valve 14 are provided in the middle of the pressurizing gas piping. Reference numeral 15 is a casting control panel composed of a timer relay and the like. The signal from the pressure switch 10 is fed back to a pressurization system, for example, an air supply valve 13, and the amount of pressurized gas supplied is controlled so that the pressure in the closed space 8 is constant.
第2図は本発明に係る低圧鋳造装置の別の実施例を示し
ており、前記実施例とは圧力の制御系が異なっているの
みである。第2図において、16は圧力−電圧変換器、
17は調節計、18は加圧パターン設定器でリレー、タ
イマ、ポテンシオメータ等で構成される。ここでは、圧
力−電圧変換器16で電気信号に変換された圧力信号は
調節計17で、加圧パターン設定器18から送られてき
た信号と比較され、加圧信号を給気弁13に対して発信
するようになっている。FIG. 2 shows another embodiment of the low-pressure casting apparatus according to the present invention, which differs from the previous embodiment only in the pressure control system. In FIG. 2, 16 is a pressure-voltage converter;
17 is a controller, and 18 is a pressurization pattern setting device, which is composed of a relay, a timer, a potentiometer, and the like. Here, the pressure signal converted into an electric signal by the pressure-voltage converter 16 is compared with the signal sent from the pressurization pattern setting device 18 by the controller 17, and the pressurization signal is sent to the air supply valve 13. It is now possible to send out messages.
上記のように構成された低圧鋳造装置において、押湯圧
の制御はつぎのように行なわれる。In the low-pressure casting apparatus configured as described above, the feeder pressure is controlled as follows.
まず、鋳込制御11i15または調節計17により給気
弁13を開き、加圧系より加圧ガスを保温炉1内空間部
に送り込む。保温炉1内の溶湯7は加圧ガスによって大
径ストーク4、小径ストーク5を上昇して鋳型3内へと
人っていく。小径ストーク5内に押し込まれたガス体は
鋳型3へ押し込まれ、鋳型3の隙間から外部へ逃げる。First, the air supply valve 13 is opened by the casting control 11i15 or the controller 17, and pressurized gas is sent into the internal space of the heat retention furnace 1 from the pressurization system. The molten metal 7 in the heat-retaining furnace 1 is moved up through the large-diameter stalk 4 and the small-diameter stalk 5 into the mold 3 by pressurized gas. The gas body pushed into the small diameter stalk 5 is pushed into the mold 3 and escapes from the gap in the mold 3 to the outside.
一方、小径ストーク5の外周側に入り溶Ii7によって
シールされたガスは、伸縮継手6の内部に圧縮され、圧
力スイッチ10の設定値によって、または加圧パターン
設定器18との設定値と比較されて調節計17によって
、給気弁13の開度が調節され、所定の圧力に保持され
る。On the other hand, the gas that enters the outer circumferential side of the small diameter stalk 5 and is sealed by the melt Ii 7 is compressed into the expansion joint 6 and is compared with the set value of the pressure switch 10 or the set value of the pressurization pattern setter 18. The opening degree of the air supply valve 13 is adjusted by the controller 17 and maintained at a predetermined pressure.
第3図は圧力の制御特性の一例を示しており、PIは密
閉空間8部の圧力、PFは保温炉1内空間部の圧力を示
している。図に示すように、PIが一定の圧力Piに制
御されることにより、毎ショット、押湯圧を一定にする
ことができ、製品の品質が高められる。FIG. 3 shows an example of pressure control characteristics, where PI indicates the pressure in the closed space 8, and PF indicates the pressure in the internal space of the heat retention furnace 1. As shown in the figure, by controlling PI to a constant pressure Pi, the feeder pressure can be kept constant for each shot, improving the quality of the product.
一万PFは、小径スl〜−り5に溶湯が達するまでの圧
力POが上記PIに加わったものとなり、毎ショットの
潮面低下が自動的に補償される。10,000 PF is the pressure PO added to the above PI until the molten metal reaches the small diameter slots 1 to 5, and the drop in the tide level for each shot is automatically compensated for.
また、鋳型3の保温炉1上方へのセットにおいては、小
径ス)〜−り5が大径ストーク4内に挿入されれば、位
置精度は特に前後、左右、上下何れの方向にも必要とさ
れず、鋳型3と保温炉1との芯出しが緩和され、段取作
業、設置作業が大幅に容易になっている。In addition, when setting the mold 3 above the heat insulating furnace 1, if the small diameter stalk 5 is inserted into the large diameter stalk 4, positional accuracy is especially required in any of the front and back, left and right, and up and down directions. This eases the need for centering between the mold 3 and the heat-retaining furnace 1, making setup and installation work much easier.
以上の通りであるから、本発明の低圧鋳造装置によると
きは、つぎに掲げる種々の効果が得られる。As described above, when using the low pressure casting apparatus of the present invention, the following various effects can be obtained.
まず、ストークを2分割ストークどして複合重合させ、
該部位の密閉空間部の圧力により保温炉の加圧制御を行
なうので、押湯圧の均一化をはかることができ、製品の
品質向上をはかることができる。First, the stalk is divided into two stalks and composite polymerized,
Since the pressurization of the heat-retaining furnace is controlled by the pressure in the closed space of the area, it is possible to equalize the feeder pressure and improve the quality of the product.
また、ストーク4r2分割構成としたので、保温炉と鋳
型の相互位置関係が緩和され、保温炉7−
と鋳造機の組み合せを容易にすることができ、かつ作業
時間を短縮できる。Further, since the stalk 4r2 is divided into two parts, the mutual positional relationship between the heat insulating furnace and the mold is relaxed, making it easy to combine the insulating furnace 7- and the casting machine, and shortening the working time.
ストークを2分割構成としたので、保温炉と鋳型の着脱
のための揚程が少なくなり、設備費を低減できる。Since the stalk is structured in two parts, the lifting height for attaching and detaching the heat insulating furnace and mold is reduced, and equipment costs can be reduced.
また、ストークを2分割したので、保温炉および鋳型に
無理な圧着力がかからす、構造を簡素化できる。Furthermore, since the stalk is divided into two parts, the structure can be simplified, which avoids applying excessive pressure to the heat insulating furnace and mold.
また、ストークを2分割したので、消耗部品のコストが
安くなり、品質を下げることもでき、ストークのコスト
低減をはかることかできる。Furthermore, since the stalk is divided into two parts, the cost of consumable parts can be reduced and quality can be lowered, making it possible to reduce the cost of the stalk.
ざらに、小径ストークがその外周部を空気遮断されるの
で、口金部の溶湯の凝固が回避され、製品各部より側口
への指向性凝固が促進され、品質が向上する。In general, since the outer periphery of the small-diameter stalk is blocked from air, solidification of the molten metal at the mouthpiece is avoided, and directional solidification from each part of the product to the side mouth is promoted, improving quality.
第1図は本発明の一実施例に係る低圧鋳造装置の加圧系
統も併せ示した断面図、
第2図は本発明の別の実施例に係る装置の加圧装置の系
統図、
8−
第3図は加圧鋳造パターンを示す保鳩炉の圧力特性図、
である。
1・・・・・・・・・保温炉
2・・・・・・・・・鋳型取付部材
3・・・・・・・・・鋳型
4・・・・・・・・・大径ストーク
5・・・・・・・・・小径スト−り
6・・・・・・・・・伸縮継手
7・・・・・・・・・溶湯
8・・・・・・・・・密閉空間
9・・・・・・・・・圧力検出導管
10・・・・・・・・・圧力検出装置
13・・・・・・・・・給気弁
15・・・・・・・・・タイマリレーFIG. 1 is a sectional view also showing a pressurizing system of a low-pressure casting apparatus according to an embodiment of the present invention, and FIG. 2 is a system diagram of a pressurizing system of an apparatus according to another embodiment of the present invention. Figure 3 is a pressure characteristic diagram of a pigeon holding furnace showing a pressure casting pattern. 1......Heating furnace 2...Mold mounting member 3...Mold 4...Large diameter stalk 5 ......Small diameter stroke 6...Expansion joint 7... Molten metal 8...... Sealed space 9. ...... Pressure detection conduit 10 ...... Pressure detection device 13 ...... Air supply valve 15 ...... Timer relay
Claims (1)
ークを保温炉側に取付けた大径ストークと鋳型側に取付
けた小径ストークとの2分割構成とし、大径ストーク内
に小径ストークを挿入するとともに大径ストークを小径
ストークの周囲に設けた伸縮継手を介して鋳型に気密に
連結し、小径ストーク外周と大径ストークおよび伸縮継
手内周との間に鋳造時に形成される密閉空間部に圧力検
出装置を接続して該圧力検出装置の信号を保温炉への加
圧ガス供給系にフィードバックして加圧を制御せしめた
ことを特徴とする低圧鋳造装置。(1) The stalk that guides the molten metal in the insulating furnace to the mold above the insulating furnace is divided into two parts: a large diameter stalk attached to the insulating furnace side and a small diameter stalk attached to the mold side, and the small diameter stalk is installed inside the large diameter stalk. When inserted, the large diameter stalk is airtightly connected to the mold via an expansion joint provided around the small diameter stalk, and a sealed space is formed during casting between the outer periphery of the small diameter stalk and the inner periphery of the large diameter stalk and the expansion joint. 1. A low-pressure casting apparatus characterized in that a pressure detection device is connected to the pressure detection device, and a signal from the pressure detection device is fed back to a pressurized gas supply system to a heat retention furnace to control pressurization.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12604482A JPS5916664A (en) | 1982-07-20 | 1982-07-20 | Low pressure casting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12604482A JPS5916664A (en) | 1982-07-20 | 1982-07-20 | Low pressure casting device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5916664A true JPS5916664A (en) | 1984-01-27 |
JPH037467B2 JPH037467B2 (en) | 1991-02-01 |
Family
ID=14925262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12604482A Granted JPS5916664A (en) | 1982-07-20 | 1982-07-20 | Low pressure casting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5916664A (en) |
-
1982
- 1982-07-20 JP JP12604482A patent/JPS5916664A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH037467B2 (en) | 1991-02-01 |
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