JPS62248551A - Molten metal supplying control apparatus for low pressure casting - Google Patents
Molten metal supplying control apparatus for low pressure castingInfo
- Publication number
- JPS62248551A JPS62248551A JP9094286A JP9094286A JPS62248551A JP S62248551 A JPS62248551 A JP S62248551A JP 9094286 A JP9094286 A JP 9094286A JP 9094286 A JP9094286 A JP 9094286A JP S62248551 A JPS62248551 A JP S62248551A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- molten metal
- flow rate
- value
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 43
- 238000005266 casting Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、所定樋の溶湯を収容した密閉保温炉内を加圧
してストークにより連結された鋳型内に順次溶湯を供給
して鋳造成形を行う低圧鋳造を実施する際、鋳造ショツ
ト数に拘らず鋳型内への給湯条件を常に一定に維持する
為の低圧鋳造用給湯側御！Ｉ装置に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention performs casting molding by pressurizing the inside of a sealed heat-insulating furnace containing molten metal in a predetermined gutter and sequentially supplying the molten metal into molds connected by stalks. When performing low-pressure casting, control the hot water supply side for low-pressure casting to always maintain constant hot water supply conditions into the mold regardless of the number of casting shots! Regarding the I device.
（従来技術）
低圧鋳造時の保温炉内加圧パターンは、第４図示の通り
であり、溶湯を鋳型ゲート部迄上昇させる一次圧パター
ンａ、詩型内へ注入する二次圧パターン勢、鋳型内注入
後に押湯する三次圧パターンＣ１及び最終押湯圧（四次
圧）パターンｄから成る。而して、安定した鋳込み特性
を得る為には、鋳造ショツト数に拘らず、二次圧パター
ンｂ及び三次加圧パターンＣの傾斜を常に一定に維持し
て鋳型内への給湯条件が不変のものとなるよう制御する
ことが必要となる。(Prior art) The pressurization pattern in the heat retention furnace during low-pressure casting is as shown in Figure 4, which includes a primary pressure pattern a for raising the molten metal to the mold gate, a secondary pressure pattern for injecting it into the mold, and a mold. It consists of a tertiary pressure pattern C1 and a final feeder pressure (quaternary pressure) pattern d, which are heated after internal injection. Therefore, in order to obtain stable casting characteristics, regardless of the number of casting shots, the inclinations of the secondary pressure pattern B and the tertiary pressure pattern C must always be kept constant so that the conditions for supplying hot water into the mold remain unchanged. It is necessary to control it so that it becomes a thing.
この種低圧鋳造用湯制御装置として
は、特開昭５９−１６６６４号開示のものがある。即ち
、保温炉内の溶湯を保温炉上方の鋳型に導くストークを
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及び伸縮継手内周と
の間に鋳造時に形成される密閉室ｆｆ１ｆ部に圧力検出
装置を接続して構成したものであり、圧力検出装置の伝
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
圧を制御せしめることにより、給湯条件を常に一定に維
持せんとしたちのである。This type of low-pressure casting hot water control device is disclosed in Japanese Patent Application Laid-Open No. 59-16664. In other words, 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 inserted into the large-diameter stalk. At the same time, the large-diameter stalk is airtightly connected to the mold via an expansion joint provided around the small-diameter stalk, and a sealed chamber ff1f portion 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. A pressure detection device is connected to the furnace, and the signal from the pressure detection device is fed back to the pressurized gas supply system to the heating furnace to control pressurization, thereby maintaining constant water supply conditions. Toshichino.
しかし乍ら、Ｅ記構成のものでは、保温炉内の溶湯が鋳
型内に供給されている間、密閉空間部のカス川は溶湯移
動開始＋ｉｉｊのカス圧に維持されることとなり、圧力
変化が生じるのは、溶湯供給路Ｙ後となる。従って、−
・沈圧パターンから二次圧パターンへの切り換えタイミ
ングを実際に溶湯が鋳型ゲート部に到達した時点とリン
クさせることが出来ず、それ故に、二次用以降の圧力切
換えタイミングがショット毎にまちまちとなって給湯条
件を一定となし得ない問題点を有している。However, in the configuration described in E, while the molten metal in the insulating furnace is being supplied into the mold, the scum river in the closed space is maintained at the scum pressure of molten metal movement start + iij, and the pressure changes. This occurs after the molten metal supply path Y. Therefore, −
・It is not possible to link the timing of switching from the submersion pressure pattern to the secondary pressure pattern with the point in time when the molten metal actually reaches the mold gate, and therefore the timing of pressure switching after secondary use varies from shot to shot. Therefore, there is a problem in that hot water supply conditions cannot be kept constant.
（発明の目的）
本発明は、上記の如き喉情に鑑み、二次圧パターンへの
切換えタイミングを実際に溶湯が１４５ゲ一ト部に到達
した時点にリンクさせ几つその時点の保温炉内実測圧力
値を基準として二次圧パターン以降の圧力変化を制御す
ることにより、常に安定した鋳込み特性を得ることを可
能にする低圧鋳造用給湯制御装置の提供、をその目的と
する。(Object of the Invention) In view of the above-mentioned circumstances, the present invention links the timing of switching to the secondary pressure pattern to the point in time when the molten metal actually reaches the 145 gate part. The object of the present invention is to provide a low-pressure casting hot water supply control device that makes it possible to always obtain stable casting characteristics by controlling pressure changes after the secondary pressure pattern based on actually measured pressure values.
（発明の構１＆）
この為１本発明に係る低圧鋳造用給湯制御装置は、第１
図示の如く、鋳型ゲート部への溶湯上昇を検知する溶湯
検知手段と、保温炉内のエア圧を検出する圧力検出手段
と、前記溶湯検知手段による溶湯上昇検知時の前記圧力
検出手段による検出圧力値に基づいて導入エアの設定圧
力値及び設定流Ｍ（＃を補正する圧力１流呈補１Ｅ−１
：段と、該圧力・流量補正手段による補正圧力値及び補
正流ｇ、値に基づいて導入エアの圧力及び流量を制御す
る制御手段とを備え、鋳型ゲート部への溶湯上昇を検知
した時点で二次圧への加圧パターン切り換えを行うと共
に、その時点での保温炉内エア圧の実測値に基づいて導
入エアの流量及び圧力を制御することにより、常に一定
の加圧パターンを維持し、ショット会に拘らず安定した
鋳込み特性を得るよう構成されている。(Structure of the Invention 1&) For this reason, the low-pressure casting hot water supply control device according to the present invention has the following features:
As shown in the figure, there is a molten metal detection means for detecting the rise of the molten metal to the mold gate, a pressure detection means for detecting the air pressure in the insulating furnace, and a pressure detected by the pressure detection means when the molten metal detection means detects the rise of the molten metal. Pressure 1 flow correction 1E-1 to correct the set pressure value and set flow M (#) of the introduced air based on the value
: stage, and a control means for controlling the pressure and flow rate of the introduced air based on the corrected pressure value and the corrected flow g value by the pressure/flow rate correction means, and when the rising of the molten metal to the mold gate part is detected. By switching the pressurization pattern to the secondary pressure and controlling the flow rate and pressure of the introduced air based on the actual value of the air pressure inside the heating furnace at that time, a constant pressurization pattern is always maintained. It is constructed to obtain stable casting characteristics regardless of shot conditions.
（実施例）
第２図において、低圧鋳造装置１０は、密閉構造とした
保温炉ｌｌ内に溶湯１２を収容したルツボ１３を設置し
、上方に設けられた鋳型１４のゲートｆｉ１４ａに上端
を連結したストーク１５のド端をルツボ１３内に配置し
て構成されている。(Example) In FIG. 2, a low-pressure casting apparatus 10 includes a crucible 13 containing a molten metal 12 in a heat-retaining furnace 11 having a closed structure, and an upper end thereof is connected to a gate fi 14a of a mold 14 provided above. The stalk 15 is configured such that the end thereof is placed inside the crucible 13.
保温炉ｌｌ内には、圧力源２１より圧力弁２２、Ｎｔ埴
方弁２３介してエアを導入するエアダクト２０が連結開
口されており、圧力弁ｚ２、流量弁２３の弁開度は、コ
ントローラ１００からの制御信号によって作動するサー
ボドライバ２４により調整されるようになっている。An air duct 20 that introduces air from a pressure source 21 through a pressure valve 22 and a Nt valve 23 is connected and opened in the heat retention furnace 11, and the valve opening degrees of the pressure valve z2 and the flow rate valve 23 are controlled by the controller 100. The adjustment is performed by a servo driver 24 operated by a control signal from the servo driver 24.
ストーク１５最上端には、溶湯Ｅ昇を検知する為の感熱
センサ等から戚る溶湯センサ３１が設置されており、溶
湯を昇検知時の出力信号はコントローラ１００に送られ
るようになっている。A molten metal sensor 31, such as a heat-sensitive sensor, is installed at the top end of the stalk 15 to detect the rise of the molten metal E, and an output signal when detecting the rise of the molten metal is sent to the controller 100.
又、保温炉ｌｌ内には、保温炉内エア圧を検出する為の
圧力センサ３０が設置されており、その出力信号は、溶
湯センサ３１の検知信号人力時にコントローラ１００か
ら出力される制御信号に基づいて開成するゲート回路１
０１を経て演算回路１０２に入力され、演算回路１０２
による演算結果がコントローラｌθＯに出力されるよう
になっている。尚、１０３は、演算回路１０２の演算プ
ログラムを格納すると共に各種データを一時保管する為
のメモリ回路である。Further, a pressure sensor 30 is installed in the heat retention furnace 1 for detecting the air pressure inside the heat retention furnace, and its output signal is connected to the detection signal of the molten metal sensor 31 and the control signal output from the controller 100 during manual operation. Gate circuit 1 developed based on
01 to the arithmetic circuit 102;
The calculation result is output to the controller lθO. Note that 103 is a memory circuit for storing the arithmetic program of the arithmetic circuit 102 and temporarily storing various data.
このように構成される給湯制御装置の作動を第３図に示
すフローチャートに基づいて説明する。The operation of the hot water supply control device configured as described above will be explained based on the flowchart shown in FIG.
コントローラ１００は、予め設定された導入エアの初期
圧力値Ｐａと流量値Ｑｏに対応する制御信号をサーボド
ライバ２４に出力して、−法用パターンによる保温炉ｌ
Ｏ内加圧を行う。The controller 100 outputs a control signal corresponding to the preset initial pressure value Pa and flow rate value Qo of the introduced air to the servo driver 24, and controls the temperature control furnace l according to the legal pattern.
Pressurize inside O.
次いで、溶湯センサ３１からの溶湯上昇検知信号が入力
されるとコントローラｌＯＯよリゲート１０１開成信号
が出力され、圧力センサ３０の検出信号が演算回路１０
２に入力される。＠算回路１０２は、圧力センサ３０に
より検…された実測圧力値Ｐをメモリ回路１０３に格納
すると共に、メモリ回路１０３にｔめ記憶されていた溶
湯比玉ρを読出し、溶湯へ一／ ト減少高さｈを求める
演算（ｈ＝Ｐ／ρ）を行う。Next, when the molten metal rise detection signal from the molten metal sensor 31 is input, the controller lOO outputs the ligate 101 opening signal, and the detection signal of the pressure sensor 30 is input to the arithmetic circuit 10.
2 is input. The calculation circuit 102 stores the measured pressure value P detected by the pressure sensor 30 in the memory circuit 103, reads out the molten metal ratio ρ stored in the memory circuit 103, and decreases the molten metal by 1/t. A calculation (h=P/ρ) is performed to obtain the height h.
次いで、得られた溶湯ヘッド減少高さ ｈと、？めメモリ回路１０３に記憶された。Then, the resulting molten metal head decreases in height h and? The data was stored in the memory circuit 103.
溶湯ヘッド減少高さｈとそれに対応する保温炉内空隙容
積Ｖとの関係を示す二次元テーブルから、そのｌｊ点で
の保温炉内空隙容積Ｖを読み出し、同様に予めメモリ回
路１０３に記憶された０ショット時の空隙容積ＶＯと対
比して温暖補正係数Ｋを求める演′１Ｉ（Ｋ＝Ｖ／Ｖｏ
）を実行する。From the two-dimensional table showing the relationship between the molten metal head reduction height h and the corresponding void volume V in the heat insulating furnace, the void volume V in the heat insulating furnace at the lj point is read out and similarly stored in advance in the memory circuit 103. Operation '1I (K=V/Vo
).
次いで、得られた流量補１Ｆ係数にと初期流９値Ｑｏか
ら補正流駿偵ＱのｒＤ４算（Ｑ＝Ｑｏ／Ｋ）を実行し、
演算結果をコントローラ１００に出力する。Next, perform the rD4 calculation of the corrected flow rate Q (Q = Qo / K) from the obtained flow rate correction 1F coefficient and the initial flow 9 value Qo,
The calculation result is output to the controller 100.
補正流量値Ｑの演算結果を出力後、演算回路１０２は、
予めメモリ回路１０３に記憶された二次圧パターンｂの
設定圧力傾斜率Δｐ／Δｔを読出し、これとメモリ回路
１０３に格納された圧力センサ３０による上記実測圧力
値Ｐとから、′Ｆ記式による補正圧力値Ｐ （ｔ）の演
算を実行し、演算結果をコントローラ１００に出力する
。After outputting the calculation result of the corrected flow rate value Q, the calculation circuit 102
The set pressure gradient rate Δp/Δt of the secondary pressure pattern b stored in the memory circuit 103 in advance is read out, and from this and the above-mentioned actual pressure value P measured by the pressure sensor 30 stored in the memory circuit 103, the value is calculated according to the 'F notation. The corrected pressure value P (t) is calculated, and the calculation result is output to the controller 100.
上記補正圧力値Ｐ （ｔ）の演算は、予め設定された二
次圧設定時間Ｔ２が経過する迄繰返し実行され、Ｔ７経
過後は、三次圧設定時間Ｔ３が経過する迄三次圧パター
ンＣの設定傾斜率Δｐ／Δｔに基づく補正圧力値
ｐ （ｔ）を、Ｔ３経過後は、四次圧パターンｄの設定
傾斜率Δｐ／Δｔ（本実施例の場合はｌ）に基づく補正
圧力値Ｐ（ｔ）を夫々コントローラ１００に出力し、四
次圧設定時間Ｔ４経過により制御プログラムの実行を終
了する。The calculation of the corrected pressure value P (t) is repeatedly executed until the preset secondary pressure setting time T2 has elapsed, and after T7 has elapsed, the tertiary pressure pattern C is set until the tertiary pressure setting time T3 has elapsed. After T3, the corrected pressure value p(t) based on the slope rate Δp/Δt is changed to the corrected pressure value P(t) based on the set slope rate Δp/Δt (l in this example) of the quaternary pressure pattern d. ) are output to the controller 100, and the execution of the control program is ended when the quaternary pressure setting time T4 has elapsed.
而して、コントローラ１００は、 ｙ４ｇ回路１０２に
より実行−出力された上記演算結果に対応する制御上％
）をサーボドライバ２４に出力する。Therefore, the controller 100 performs the control % corresponding to the above calculation result executed and outputted by the y4g circuit 102.
) is output to the servo driver 24.
このように構成する給湯制御装置では、ルツボ１３内に
溶湯を充填した後保温炉１１内にエアを導入して保温炉
内圧力を）１．昇させ。In the hot water supply control device configured in this way, after filling the crucible 13 with molten metal, air is introduced into the heat retention furnace 11 to control the pressure inside the heat retention furnace. Let it rise.
ルツボ１３内の溶湯をストーク１５を介して鋳型１４内
に供給する。溶湯が鋳型１４のゲ−Ｎ４ａに到達すると
、溶湯センサ３１がこれを検知してコントローラ１００
に出力信号を送り、圧力センサ３０から送られてきた保
温炉１１内の実測圧力値に基づいて演算回路１０２にて
設定圧力値及び設定流ψ値を補正する所定の演算が行わ
れ、演算結果に対応する作動信号がコントローラ１００
からサーボドライバ２４に出力されて圧力弁２２゜流植
弁２３の弁開度が自動制御される。The molten metal in the crucible 13 is supplied into the mold 14 via the stalk 15. When the molten metal reaches the gate N4a of the mold 14, the molten metal sensor 31 detects this and the controller 100
A predetermined calculation is performed in the calculation circuit 102 to correct the set pressure value and the set flow ψ value based on the measured pressure value in the heat retention furnace 11 sent from the pressure sensor 30, and the calculation result is The actuation signal corresponding to the controller 100
The signal is output from the servo driver 24 to automatically control the valve opening degrees of the pressure valve 22 and the flow implantation valve 23.
（発明の効果）
上記の如き、本発明に係る低圧鋳造用給湯制御装置に依
れば、溶湯の鋳型ゲート部到達時にリンクしてニー法王
パターンへの切り換えが行われると共に、ショット毎に
実測される保温炉内エア圧に基づいて導入エアの圧力及
び波間が制御されるので、ショツト数に拘らず鋳型内−
１の給湯条件を常に一定に維持することが出来、安定し
た鋳込み特性を得ることが可能となる。(Effects of the Invention) As described above, according to the low-pressure casting metal supply control device according to the present invention, when the molten metal reaches the mold gate, switching to the Knee Pope pattern is performed, and the actual measurement is performed for each shot. Since the pressure and wave width of the introduced air are controlled based on the air pressure inside the heat insulating furnace, the air inside the mold is controlled regardless of the number of shots.
The hot water supply condition No. 1 can always be maintained constant, and stable casting characteristics can be obtained.
第り図は本発明に係る低圧鋳造用給湯制御装置の構成を
示すブロック図、第２図はその実施例を示すシステム構
成図、第３図は給湯制御のフローチャート図、第４図は
加圧パターンを示す圧力特性図である。
１１・・・保温炉
１２・・・溶湯
１４・・・鋳型
１４ａ・・・ゲート部
１５・・・ストーク
２２・・・圧力弁
２３・・・流量弁
２４・・・サーボドライバ
３０・・・圧力センサ
３１・・・溶湯センサ
ｌＯＯ・・・コントローラ
１０１・・・ゲート回路
１０２・・・演算回路
１０３・・・メモリ回路
第３図Fig. 2 is a block diagram showing the configuration of a low-pressure casting hot water supply control device according to the present invention, Fig. 2 is a system configuration diagram showing an embodiment thereof, Fig. 3 is a flowchart of hot water supply control, and Fig. 4 is a pressurization It is a pressure characteristic diagram showing a pattern. 11... Heat retention furnace 12... Molten metal 14... Mold 14a... Gate portion 15... Stoke 22... Pressure valve 23... Flow rate valve 24... Servo driver 30... Pressure Sensor 31...Molten metal sensor lOO...Controller 101...Gate circuit 102...Arithmetic circuit 103...Memory circuit FIG.
Claims (1)
変動させて鋳型内への給湯制御を行うものに於いて、 鋳型ゲート部への溶湯上昇を検知する溶湯 検知手段と、 保温炉内のエア圧を検出する圧力検出手段 と、 前記溶湯検知手段による溶湯上昇検知時の 前記圧力検出手段による検出圧力値に基づいて導入エア
の設定圧力値及び設定流量値を補正する圧力・流量補正
手段と、 該圧力・流量補正手段による補正圧力値及 び補正流量値に基づいて導入エアの圧力及び流量を制御
する制御手段、 とを備えたこと、を特徴とする低圧鋳造用 給湯制御装置。[Scope of Claims] In a device that controls the supply of hot water into the mold by varying the pressure and flow rate of air introduced into a heat-retaining furnace containing molten metal supplied into the mold via a stalk, A molten metal detection means that detects the rise of molten metal to the gate part, a pressure detection means that detects the air pressure in the heat retention furnace, and a pressure value detected by the pressure detection means when the molten metal detection means detects the rise of the molten metal. A pressure/flow rate correction means for correcting a set pressure value and a set flow rate value of air; and a control means for controlling the pressure and flow rate of introduced air based on the corrected pressure value and corrected flow rate value by the pressure/flow rate correction means. A hot water supply control device for low pressure casting, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9094286A JPS62248551A (en) | 1986-04-19 | 1986-04-19 | Molten metal supplying control apparatus for low pressure casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9094286A JPS62248551A (en) | 1986-04-19 | 1986-04-19 | Molten metal supplying control apparatus for low pressure casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62248551A true JPS62248551A (en) | 1987-10-29 |
Family
ID=14012507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9094286A Pending JPS62248551A (en) | 1986-04-19 | 1986-04-19 | Molten metal supplying control apparatus for low pressure casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62248551A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63290674A (en) * | 1987-05-21 | 1988-11-28 | Aichi Mach Ind Co Ltd | Pressure raising device for low pressure casting machine |
| JPH01143754A (en) * | 1987-11-27 | 1989-06-06 | Mazda Motor Corp | Molten metal feeding control device for molten metal feeder |
| JPH01180774A (en) * | 1987-12-28 | 1989-07-18 | Morita Mfg Co Ltd | Automatic precision casting method and its device |
| US6247521B1 (en) | 1996-08-15 | 2001-06-19 | Toyota Jidosha Kabushiki Kaisha | Pressure difference control method for filling a cavity with melt |
| JP2013141691A (en) * | 2012-01-11 | 2013-07-22 | Honda Motor Co Ltd | Method for calculating volume of air chamber in furnace, casting method, device for calculating volume of air chamber in furnace and program for calculating volume of air chamber in furnace |
| CN105689689A (en) * | 2016-04-25 | 2016-06-22 | 长沙市致能电子科技有限公司 | Low-pressure casting method and equipment |
-
1986
- 1986-04-19 JP JP9094286A patent/JPS62248551A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63290674A (en) * | 1987-05-21 | 1988-11-28 | Aichi Mach Ind Co Ltd | Pressure raising device for low pressure casting machine |
| JPH0426936B2 (en) * | 1987-05-21 | 1992-05-08 | Aichi Machine Ind | |
| JPH01143754A (en) * | 1987-11-27 | 1989-06-06 | Mazda Motor Corp | Molten metal feeding control device for molten metal feeder |
| JPH01180774A (en) * | 1987-12-28 | 1989-07-18 | Morita Mfg Co Ltd | Automatic precision casting method and its device |
| US6247521B1 (en) | 1996-08-15 | 2001-06-19 | Toyota Jidosha Kabushiki Kaisha | Pressure difference control method for filling a cavity with melt |
| JP2013141691A (en) * | 2012-01-11 | 2013-07-22 | Honda Motor Co Ltd | Method for calculating volume of air chamber in furnace, casting method, device for calculating volume of air chamber in furnace and program for calculating volume of air chamber in furnace |
| CN105689689A (en) * | 2016-04-25 | 2016-06-22 | 长沙市致能电子科技有限公司 | Low-pressure casting method and equipment |
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