JPH037467B2 - - Google Patents
Info
- Publication number
- JPH037467B2 JPH037467B2 JP12604482A JP12604482A JPH037467B2 JP H037467 B2 JPH037467 B2 JP H037467B2 JP 12604482 A JP12604482 A JP 12604482A JP 12604482 A JP12604482 A JP 12604482A JP H037467 B2 JPH037467 B2 JP H037467B2
- Authority
- JP
- Japan
- Prior art keywords
- stalk
- pressure
- mold
- furnace
- diameter
- 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
Links
- 238000005266 casting Methods 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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)
Description
【発明の詳細な説明】
本発明は、鋳込の進行によつて常に一定の加圧
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 device 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、一定量の溶湯
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溶湯量
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つた。 Conventionally, in low-pressure casting equipment, a mold is placed above a heat retention furnace that holds a certain amount of molten metal, and the sprue of the mold and the molten metal in the heat retention furnace are connected by a casting pipe, that is, a stalk, to keep the heat retention furnace airtight. As a structure, the molten metal is pushed up into the mold by pressurizing the space inside the heat-retaining furnace, but as pouring progresses, the amount of molten metal in the heat-retaining furnace decreases, so a given pressurizing force cannot provide the specified feeder pressure. There was a problem that there was no.
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つて
一定圧力の増加では押湯圧を一定に保持できない
という問題があつた。 For this reason, a method is usually used to increase the pressurizing pressure in the space inside the heat retention furnace by a constant pressure every time a casting is performed, but the initial pressure is unstable during the first casting after replenishing the molten metal, and the pressure inside the furnace is There was a problem in that the feeder pressure could not be maintained at a constant level with a constant increase in 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
構も含めて重量の大きな構造物となり、これを湯
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ツトし、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つた。 Furthermore, a mold usually consists of a metal mold, which is a heavy structure including a mold opening/closing mechanism, and is set above the insulating furnace while aligning it with the insulating furnace to prevent hot water from leaking. It is structurally and operationally difficult to connect the mold and the heat-retaining furnace via a relatively weak stalk.
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
深さ、押湯圧を実現させ、かつ鋳型の保温炉への
セツ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 depth and feeder pressure regardless of the amount of molten metal in the incubation furnace, and improves the positional accuracy of 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分割構成となつて
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
なつており、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。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イードバツク
される。したがつて、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、押湯圧も実現できる。また、ストークが２
分割構成となつているので、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
型を位置ずれをもつて不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。 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 insulation furnace side stalk has a larger pipe diameter than the mold side stalk, and the insulation furnace side stalk is inserted into the mold side stalk from the upper end downward. and,
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. During casting, 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.
A pressure detection device is connected to the space, and the detected pressure is fed back to the pressurized gas supply system to the heat retention furnace. Therefore, by controlling the pressure in the closed space to be constant, constant casting speed and feeder pressure can be achieved. Also, the stalk is 2
Since it has a split configuration, the mold can be installed above the cold 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 and improves the connection. The work becomes easier and the intended purpose is achieved.
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。
図中、１は気密構造を有する保温炉で、上部は蓋
１ａによつて覆われている。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。 FIG. 1 shows an embodiment of the present invention.
In the figure, reference numeral 1 denotes a heat-retaining furnace having an airtight structure, the upper part of which is covered with a lid 1a. 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には下方に向かつて垂下する
鋳込管、すなわちストーク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つて挿入されて
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つて溶湯を鋳型３に
導くストークが構成される。 A casting pipe, ie, a stalk 4, which hangs downward is attached to the lid 1a of the heat-retaining furnace 1. This stalk 4 is configured as a large diameter stalk made of 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。保温炉
１内の溶湯７がストーク４，５を通つて鋳型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が開転しており、該部位８の圧力は圧力検出装
置１０、たとえば圧力スイツチ１０に導かれる。 Further, an expansion joint 6 is arranged around the small diameter stalk 5. The expansion joint 6 is made of a metal bellows, for example, and connects the upper end flange of the large diameter stalk 4 and the mold mounting member 2 in an airtight manner. When the molten metal 7 in the heat insulating furnace 1 is pushed up into the mold 3 through the stalks 4 and 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 is opened and turned in the closed space 8, and the pressure in the region 8 is guided to a pressure detection device 10, for example, a pressure switch 10.
１１は保温炉１への加圧用気体連絡口で、加圧
用気体１２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。前記の圧力スイツチ１０の信号は加
圧系、たとえば給気弁１３にフイードバツクされ
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つている。 Reference numeral 11 denotes a pressurizing gas communication port to the heat insulating furnace 1, which is connected to the pressurizing gas 12. 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 pressurizing system, such as an air supply valve 13, so that 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
異なつているみである。第２図において、１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１
６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
信するようになつている。 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, 1 is a pressure-voltage converter, 17 is a controller, and 18 is a pressure pattern setting device, which is composed of a relay, a timer, a potentiometer, etc. Here, pressure-voltage converter 1
The pressure signal converted into an electric signal in step 6 is sent to controller 17.
Then, it is compared with the signal sent from the pressurization pattern setting device 18, and a pressurization signal is sent to the air supply valve 13.
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。ま
ず、鋳込制御盤１５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
スによつて大径ストーク４、小径ストーク５を上
昇して鋳型３内へと入つていく。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。 In the low-pressure casting apparatus configured as described above, the feeder pressure is controlled as follows. First, the air supply valve 13 is opened by the casting control panel 15 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 rises through the large-diameter stalk 4 and the small-diameter stalk 5 and enters the mold 3 by pressurized gas. small diameter stalk 5
The gas body pushed inside is pushed into the mold 3,
Escapes to the outside through the gap in mold 3.
一方、小径ストーク５の外周側に入り溶湯７に
よつてシールされたガスは、伸縮継手６の内部に
圧縮され、圧力スイツチ１０の設定値によつて、
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によつて、給気弁１３の開度が
調節され、所定の圧力を保持される。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
Pmに制御されることにより、毎シヨツト、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。 On the other hand, the gas that enters the outer circumferential side of the small diameter stalk 5 and is sealed by the molten metal 7 is compressed inside the expansion joint 6, and depending on the setting value of the pressure switch 10,
Alternatively, the opening degree of the air supply valve 13 is adjusted by the controller 17 based on the comparison with the setting value of the pressurization pattern setter 18, and a predetermined pressure is maintained. FIG. 3 shows an example of pressure control characteristics, where PI shows the pressure in the 8 parts of the closed space, and PF shows the pressure in the inner space of the heat retention furnace 1. As shown in the figure, PI is at constant pressure
By controlling the Pm, the feeder pressure can be kept constant for each shot, improving product quality.
一方PFは、小径ストーク５に溶湯が達するま
での圧力P0が上記PIに加わつたものとなり、毎
シヨツトの湯面低下が自動的に補償される。 On the other hand, PF is the pressure P 0 added to the above PI until the molten metal reaches the small-diameter stalk 5, and the drop in the molten metal level at each shot is automatically compensated for.
また、鋳型３の保温炉１上方へのセツトにおい
ては、小径ストーク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
容易になつている。 Furthermore, 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 not particularly required in any of the front-back, left-right, and up-down directions; 3 and the heat retention furnace 1 are relaxed, and setup work and installation work are greatly facilitated.
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分割ストークとして複合重
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 for composite polymerization, and the pressure in the insulating furnace is controlled by the pressure in the closed space of this part, so it is possible to equalize the feeder pressure and improve the quality of the product. Can be done.
また、ストークを２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。 Furthermore, since the stalk is structured in two parts, the mutual positional relationship between the heat insulating furnace and the mold is relaxed, making it possible to easily combine the insulating furnace 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、設備費も低
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 also 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ず、構造を簡素化
できる。 Furthermore, since the stalk is divided into two parts, unreasonable pressure is not applied to the heat insulating furnace and the mold, and the structure can be simplified.
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ができる。 Furthermore, since the stalk is divided into two parts, the cost of consumable parts is reduced and the quality can be lowered, so that the cost of the stalk can be reduced.
さらに、小径ストークがその外周部と空気遮断
されるので、口金部の溶湯の凝固が回避され、製
品各部より湯口への指向性凝固が促進され、品質
が向上する。 Furthermore, since the small-diameter stalk is air-blocked from its outer periphery, solidification of the molten metal at the mouthpiece is avoided, and directional solidification from each part of the product to the sprue 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、第
３図は加圧鋳造パターンを示す保温炉の圧力特性
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……小径ストーク、
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、１
３……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, FIG. 2 is a system diagram of a pressurizing system of an apparatus according to another embodiment of the present invention, and FIG. The figure is a pressure characteristic diagram of a heat retention furnace showing a pressure casting pattern. 1... Heat retention furnace, 2... Mold mounting member, 3... Mold, 4... Large diameter stalk, 5... Small diameter stalk,
6... Expansion joint, 7... Molten metal, 8... Closed space,
9...Pressure detection conduit, 10...Pressure detection device, 1
3...Air supply valve, 15...Timer relay.
Claims (1)
ト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
の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
圧ガス供給系にフイードバツ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,
A small-diameter stalk is inserted into a large-diameter stalk, and the large-diameter stalk is airtightly connected to the mold via an expansion joint provided around the small-diameter stalk. A low-pressure casting device characterized in that a pressure detection device is connected to a closed space formed during casting, 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 JPS5916664A (en) | 1984-01-27 |
| JPH037467B2 true 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 |
|---|---|
| JPS5916664A (en) | 1984-01-27 |
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