JPH0342990B2 - - Google Patents
Info
- Publication number
- JPH0342990B2 JPH0342990B2 JP57145522A JP14552282A JPH0342990B2 JP H0342990 B2 JPH0342990 B2 JP H0342990B2 JP 57145522 A JP57145522 A JP 57145522A JP 14552282 A JP14552282 A JP 14552282A JP H0342990 B2 JPH0342990 B2 JP H0342990B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- molten metal
- low
- mold
- compressed air
- 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 - Lifetime
Links
- 239000002184 metal Substances 0.000 claims description 68
- 238000005266 casting Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 13
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 230000013011 mating Effects 0.000 description 2
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 210000003278 egg shell Anatomy 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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
-
- 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
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は低圧鋳造機を使用する低圧鋳造方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a low-pressure casting method using a low-pressure casting machine.
［従来の技術］
従来、低圧鋳造機を使用して鋳造を行なうに際
しては、低圧鋳造機内に収容された溶湯表面を圧
縮エアによつて加圧し、この加圧力によつて溶湯
を金型内に充填し、鋳造を行なつている。[Prior Art] Conventionally, when casting using a low-pressure casting machine, the surface of the molten metal housed in the low-pressure casting machine is pressurized with compressed air, and this pressurizing force is used to push the molten metal into the mold. Filling and casting are underway.
低圧鋳造機を用いて緻密な鋳造品を得るために
は、溶湯に対する圧縮エアの加圧力を増大すれば
よい。これは、高い圧縮エアで溶湯の加圧を行な
うことにより、金型内への溶湯の充填率が増加
し、鋳造品の内部欠陥が減少するからである。 In order to obtain a dense cast product using a low-pressure casting machine, it is sufficient to increase the pressure of compressed air against the molten metal. This is because pressurizing the molten metal with highly compressed air increases the filling rate of the molten metal into the mold and reduces internal defects in the cast product.
［発明が解決しようとする課題］
しかしながら、従来の低圧鋳造法において緻密
な鋳造品を得ようとする場合、最初から高圧の圧
縮エアを溶いて溶湯の加圧を行なうと、金型の合
せ部の隙間から溶湯が侵入してバリが増大した
り、砂中子が破損したり、目ざし等の不良が発生
するという問題が生じる。したがつて、従来の低
圧鋳造方法では、加圧力を一定値以上増大するこ
とができず、内部欠陥の少ない緻密な鋳造品を得
ることが困難であつた。[Problems to be Solved by the Invention] However, when trying to obtain a dense cast product using the conventional low-pressure casting method, if high-pressure compressed air is melted to pressurize the molten metal from the beginning, the mating parts of the molds will be damaged. Molten metal enters through the gaps, causing problems such as increased burrs, damage to the sand core, and poor alignment. Therefore, in the conventional low-pressure casting method, it is not possible to increase the pressurizing force beyond a certain value, and it is difficult to obtain a dense cast product with few internal defects.
本発明は、上記の問題に着目し、バリの発生、
中子の破損、目ざし等の不良の発生を大幅に低減
するとともに、緻密な鋳造品を得ることが可能な
低圧鋳造方法を提供することを目的とする。 The present invention focuses on the above problems, and eliminates the occurrence of burrs.
It is an object of the present invention to provide a low-pressure casting method that can significantly reduce the occurrence of defects such as core breakage and aiming problems, and can produce dense cast products.
［課題を解決するための手段］
この目的に沿う本発明の低圧鋳造方法は、炉内
の溶湯を低圧の圧縮エアによつて押上げて該溶湯
を金型内に充填し、該金型内に充填された溶湯の
表面が凝固する温度よりも低下したと判断手段に
よつて判断された後に、前記圧縮エアの圧力を上
昇させて金型内の溶湯を加圧する方法から成る。[Means for Solving the Problems] The low-pressure casting method of the present invention, which meets this objective, pushes up the molten metal in the furnace using low-pressure compressed air, fills the molten metal into the mold, and presses the molten metal in the mold. After the determination means determines that the temperature of the surface of the molten metal filled in the mold has fallen below the solidification temperature, the pressure of the compressed air is increased to pressurize the molten metal in the mold.
［作用］
このように構成された低圧鋳造方法において
は、炉内の溶湯か低圧の圧縮エアによつて押上げ
られ、金型内に充填される。この状態では溶湯が
作用する圧力は低いので、金型の合せ部の隙間に
溶湯が侵入することもない。[Operation] In the low-pressure casting method configured as described above, the molten metal in the furnace is pushed up by low-pressure compressed air and filled into the mold. In this state, the pressure exerted by the molten metal is low, so the molten metal does not enter the gap between the mating parts of the mold.
金型に溶湯が充填されると、溶湯は金型との熱
変換によつて冷却される。そして、溶湯の表面温
度が凝固温度以下になつたか否かが判断手段によ
つて判断され、溶湯の表面が凝固したと判断され
た後に、圧縮エアの圧力が上昇される。つまり、
溶湯表面の凝固部分が卵の殻のようになつた状態
で、圧縮エアの圧力が高められるので、溶湯は表
面の凝固部分からはみ出すことができなくなる。
そのため、中子自体に高い圧力が作用することも
なくなり、バリや目ざし等の発生も防止される。 When the mold is filled with molten metal, the molten metal is cooled by heat exchange with the mold. Then, the determination means determines whether the surface temperature of the molten metal has fallen below the solidification temperature, and after determining that the surface of the molten metal has solidified, the pressure of the compressed air is increased. In other words,
When the solidified portion on the surface of the molten metal becomes like an eggshell, the pressure of the compressed air is increased, so that the molten metal cannot protrude from the solidified portion on the surface.
Therefore, high pressure is not applied to the core itself, and the occurrence of burrs, marks, etc. is also prevented.
この状態では、溶湯は高い圧力によつて加圧さ
れるので、溶湯の充填率が高められ、鋳造品の内
部欠陥の減少により緻密な鋳造品が得られる。 In this state, the molten metal is pressurized under high pressure, so the filling rate of the molten metal is increased, and internal defects in the cast product are reduced, resulting in a dense cast product.
［実施例］
以下に、本発明に係る低圧鋳造方法の望ましい
実施例を、図面を参照し説明する。[Example] Hereinafter, a preferred example of the low pressure casting method according to the present invention will be described with reference to the drawings.
第１実施例
第１図および第２図は、本発明の第１実施例を
示している。図中、低圧鋳造機１の炉１ｂの内部
には溶湯２が収容されている。低圧鋳造機１の上
面は蓋体３，４で密閉され、蓋体４の上面には金
型５が固定されている。そして、金型５のキヤビ
テイ５ａは溶湯導入管６を介して溶湯２と連通さ
れている。First Embodiment FIGS. 1 and 2 show a first embodiment of the present invention. In the figure, a molten metal 2 is housed inside a furnace 1b of a low-pressure casting machine 1. The upper surface of the low-pressure casting machine 1 is sealed with lids 3 and 4, and a mold 5 is fixed to the upper surface of the lid 4. The cavity 5a of the mold 5 is communicated with the molten metal 2 via the molten metal introduction pipe 6.
圧縮エア供給源７からの圧縮エアは、管路８，
９を介して低圧鋳造機１の内部空間１ａに導かれ
るようになつている。管路８には減圧弁１０、低
圧加圧用電磁弁１１、チエツク弁１２がそれぞれ
介装されている。管路９には、圧力センサ１３が
設けられている。圧力センサ１３は、アンプ装置
１４ａとタイマ装置１４ｂとの両機能を備えた装
置（以下、アンプ・タイマ装置という。）１４は
電気的に接続されている。本実施例においては、
圧縮エアの供給源７の設定圧は５〜６Kg／cm2とさ
れ、減圧弁１０の設定圧は0.2〜0.5Kg／cm2とされ
ている。管路８に介装された減圧弁１０、低圧加
圧用電磁弁１１、チエツク弁１２は、低圧加圧ラ
インを構成している。 The compressed air from the compressed air supply source 7 is supplied to the pipe line 8,
9 into the internal space 1a of the low pressure casting machine 1. A pressure reducing valve 10, a low pressure pressurizing solenoid valve 11, and a check valve 12 are interposed in the pipe line 8, respectively. A pressure sensor 13 is provided in the pipe line 9 . The pressure sensor 13 is electrically connected to a device 14 (hereinafter referred to as an amplifier/timer device) having both the functions of an amplifier device 14a and a timer device 14b. In this example,
The set pressure of the compressed air supply source 7 is 5 to 6 kg/cm 2 , and the set pressure of the pressure reducing valve 10 is 0.2 to 0.5 kg/cm 2 . A pressure reducing valve 10, a low pressure pressurizing solenoid valve 11, and a check valve 12, which are installed in the pipe line 8, constitute a low pressure pressurizing line.
管路８と管路９との間には、管路１５が並設さ
れ、管路１５には減圧弁１６と高圧加圧用電磁弁
１７とが介装されている。高圧加圧用電磁弁１７
は、アンプ・タイマ装置１４に電気的に接続さ
れ、アンプ・タイマ装置１４の制御信号を受けて
開閉動作を行なう。本実施例においては、減圧弁
１６の設定圧は0.5〜５Kg／cm2であり、管路１５
に介装された減圧弁１６と高圧加圧用電磁弁１７
とにより高圧加圧ラインが構成される。 A pipe line 15 is arranged in parallel between the pipe line 8 and the pipe line 9, and a pressure reducing valve 16 and a high pressure pressurizing solenoid valve 17 are interposed in the pipe line 15. High pressure solenoid valve 17
is electrically connected to the amplifier/timer device 14 and performs opening/closing operations in response to a control signal from the amplifier/timer device 14. In this embodiment, the set pressure of the pressure reducing valve 16 is 0.5 to 5 kg/cm 2 , and
A pressure reducing valve 16 and a high pressure pressurizing solenoid valve 17 are installed in the
A high-pressure pressurizing line is constructed.
管路８と管路９とには、管路１８が連結されて
おり、管路１８には排気用電磁弁１９が介装され
ている。管路１８と排気用電磁弁１９は、排気ラ
インを構成している。 A pipe line 18 is connected to the pipe line 8 and the pipe line 9, and an exhaust electromagnetic valve 19 is interposed in the pipe line 18. The pipe line 18 and the exhaust electromagnetic valve 19 constitute an exhaust line.
つぎに、上記第１実施例の作用について説明す
る。 Next, the operation of the first embodiment will be explained.
図示しない制御装置から加圧開始信号（鋳造開
始信号）が発せられると、第２図に示すように、
排気用電磁弁１９が閉じると同時に低圧加圧用電
磁弁１１が開き、減圧弁１０で減圧された低圧加
圧用圧縮エアが低圧鋳造機１の炉１ｂの内部空間
１ａに供給される。圧縮エアが炉１ｂに供給され
ると、溶湯２の表面に圧縮エアの圧力が作用し、
溶湯２は溶湯導入管６を介して金型５内に押し上
げられる。これにより、金型５のキヤビテイ５ａ
には溶湯２が充填される。 When a pressurization start signal (casting start signal) is issued from a control device (not shown), as shown in FIG.
At the same time as the exhaust electromagnetic valve 19 closes, the low pressure pressurization electromagnetic valve 11 opens, and the low pressure pressurization compressed air whose pressure has been reduced by the pressure reducing valve 10 is supplied to the internal space 1a of the furnace 1b of the low pressure casting machine 1. When compressed air is supplied to the furnace 1b, the pressure of the compressed air acts on the surface of the molten metal 2,
The molten metal 2 is pushed up into the mold 5 via the molten metal introduction pipe 6. As a result, the cavity 5a of the mold 5
is filled with molten metal 2.
金型５のキヤビテイ５ａが溶湯２で充填される
と、管路９内のエアは最終的には減圧弁１０で減
圧されたエア圧（第２図中、の圧力）まで上昇
する。溶湯２が金型５に充填された後、圧縮エア
の圧力がエア圧まで上昇するには一定のタイム
ラグが存するので、溶湯２の充填の完了を検知す
るための圧力センサ１３の設定圧は、圧力より
も低い圧力としてある。すなわち、圧力センサ
１３は、この設定圧を検知して作動することと
なる。第２図中、ｂ点は溶湯の充填が完了した時
点を示している。なお、ａ点は圧縮エアによる溶
湯２の加圧開始点を示している。 When the cavity 5a of the mold 5 is filled with the molten metal 2, the air in the conduit 9 eventually rises to the air pressure reduced by the pressure reducing valve 10 (the pressure in FIG. 2). After the mold 5 is filled with the molten metal 2, there is a certain time lag for the pressure of the compressed air to rise to the air pressure, so the set pressure of the pressure sensor 13 for detecting the completion of filling the molten metal 2 is as follows: The pressure is lower than the pressure. That is, the pressure sensor 13 detects this set pressure and operates. In FIG. 2, point b indicates the point at which filling of the molten metal is completed. Note that point a indicates the starting point of pressurizing the molten metal 2 by compressed air.
圧力センサ１３が設定圧を検知すると、圧力
センサ１３はアンプ・タイマ装置１４へ充填完了
信号を発し、アンプ・タイマ装置１４のタイマ装
置１４ｂは、キヤビテイ５ａ内の溶湯の表面が凝
固するのに要する時間（以下、表面凝固時間とい
う。）Ｔ（通常、20秒程度）を経過した後、高圧加
圧用電磁弁１７へ弁開放信号を発することとなる
（第２図参照）。 When the pressure sensor 13 detects the set pressure, the pressure sensor 13 issues a filling completion signal to the amplifier/timer device 14. After a time (hereinafter referred to as surface solidification time) T (usually about 20 seconds) has elapsed, a valve opening signal is issued to the high pressure solenoid valve 17 (see FIG. 2).
高圧加圧用電磁弁１７が開くと低圧鋳造機１の
内部空間１ａには高圧加圧用圧縮エアが供給さ
れ、キヤビテイ５ａ内の溶湯はこの圧縮エア圧に
よつて高圧で加圧される。（第２図中、の圧力）
このとき、チエツク弁１２によつて管路８は閉鎖
されるから高圧加圧用圧縮エアが低圧加圧ライン
方向へ洩れることはない。 When the high-pressure pressurizing solenoid valve 17 opens, high-pressure pressurizing compressed air is supplied to the internal space 1a of the low-pressure casting machine 1, and the molten metal in the cavity 5a is pressurized at high pressure by this compressed air pressure. (Pressure in Figure 2)
At this time, since the pipe line 8 is closed by the check valve 12, the compressed air for high pressure pressurization will not leak toward the low pressure pressurization line.
そして、図示しない制御装置が加圧完了信号
（鋳造完了信号）を発すると、低圧加圧用電磁弁
１１と高圧加圧用電磁弁１７とが閉鎖し、圧縮エ
アの供給を停止すると同時に排気用電磁弁１９が
開放して低圧鋳造機１内の圧縮エアを大気中へ放
出し、加圧工程は終了することとなる（第２図
中、ｄ〜ｅの時点）。 When the control device (not shown) issues a pressurization completion signal (casting completion signal), the low pressure pressurization solenoid valve 11 and the high pressure pressurization solenoid valve 17 close, and at the same time, the supply of compressed air is stopped and the exhaust solenoid valve 19 is opened and the compressed air in the low-pressure casting machine 1 is released into the atmosphere, and the pressurizing process is completed (points d to e in FIG. 2).
第２実施例
第３図は、本発明の第２実施例を示している。
第３図中、第２図と同一符号を付した構成要素は
第１実施例と同一の機能を果す。第２実施例が前
記第１実施例と異なる点は、圧縮ガスを低圧から
高圧に切換えるための装置の構成に存する。本実
施例では、金型５に溶湯２の表面温度を間接的に
検知する温度センサ２０が取付けられている。こ
の温度センサ２０は、接点付温度計２１に電気的
に接続され、接点付温度計２１には高圧加圧用電
磁弁１７が電気的に接続されている。接点付温度
計２１は、金型５に充填された溶湯２の表面温度
が凝固する温度よりも低下したときに、高圧加圧
用電磁弁１７を切替作動させるようになつてい
る。Second Embodiment FIG. 3 shows a second embodiment of the invention.
In FIG. 3, components given the same reference numerals as in FIG. 2 perform the same functions as in the first embodiment. The second embodiment differs from the first embodiment in the configuration of the device for switching compressed gas from low pressure to high pressure. In this embodiment, a temperature sensor 20 that indirectly detects the surface temperature of the molten metal 2 is attached to the mold 5. This temperature sensor 20 is electrically connected to a thermometer 21 with contacts, and a high pressure solenoid valve 17 is electrically connected to the thermometer 21 with contacts. The thermometer 21 with contacts switches the high pressure solenoid valve 17 when the surface temperature of the molten metal 2 filled in the mold 5 falls below the solidification temperature.
このように構成された第２実施例においては、
低圧加圧用電磁弁１１が開くと同時に排気用電磁
弁１９が閉じ、圧縮エアの供給によつて溶湯２が
低圧で金型５のキヤビテイ５ａ内に充填される。
溶湯２の充填が完了した後、金型５の温度がキヤ
ビテイ５ａ内の溶湯の表面が凝固する温度よりも
若干低い温度になつた時、温度センサ２０からの
信号によつて接点付温度計２の接点がONとな
り、高圧加圧用電磁弁１７に弁開放信号を発す
る。これによつて、キヤビテイ５ａ内の溶湯は高
圧となつた圧縮エアによつて加圧される。その後
の作用は前記第１実施例と同様である。 In the second embodiment configured in this way,
At the same time as the low-pressure pressurizing solenoid valve 11 opens, the exhaust solenoid valve 19 closes, and the molten metal 2 is filled into the cavity 5a of the mold 5 at low pressure by supplying compressed air.
After the filling of the molten metal 2 is completed, when the temperature of the mold 5 becomes slightly lower than the temperature at which the surface of the molten metal in the cavity 5a solidifies, the contact thermometer 2 is activated by a signal from the temperature sensor 20. The contact turns ON and issues a valve opening signal to the high pressure pressurizing solenoid valve 17. As a result, the molten metal within the cavity 5a is pressurized by the high pressure compressed air. The subsequent operation is similar to that of the first embodiment.
要するに、前記第１実施例においては、金型内
に充填される溶湯の充填完了時を圧縮ガスの圧力
を圧力センサ１３で検知することによつて認識
し、この充填完了時以後でかつ溶湯表面が凝固す
るのに十分な時間Ｔが経過した後に、圧縮エアを
低圧から高圧へ切換えるのである。これに対し、
本実施例においては金型に設けられた温度センサ
２０によつて金型内の溶湯の表面温度を間接的に
知ることができるから、溶湯の表面凝固温度以下
となつたときにこれを温度センサ２０によつて検
知し、圧縮エアの圧力を低圧から高圧に切換える
のである。 In short, in the first embodiment, the completion of filling the molten metal into the mold is recognized by detecting the pressure of the compressed gas with the pressure sensor 13, and after the completion of filling, the molten metal surface is detected. After a time T sufficient for solidification, the compressed air is switched from low pressure to high pressure. In contrast,
In this embodiment, since the surface temperature of the molten metal in the mold can be indirectly known by the temperature sensor 20 provided in the mold, when the surface temperature of the molten metal falls below the surface solidification temperature, the temperature sensor 20 detects the surface temperature of the molten metal. 20, and the pressure of the compressed air is switched from low pressure to high pressure.
なお、上記第１実施例および第２実施例では、
圧縮エアの圧力を低圧と高圧との二段階に切換え
るものについて説明したが、製品形状によつては
低圧、中圧、高圧の三段階に切換えることも可能
であり、さらに四段階以上に切換えることもでき
る。 In addition, in the above-mentioned first example and second example,
We have explained how to switch the pressure of compressed air into two stages: low pressure and high pressure, but depending on the shape of the product, it is also possible to switch between three stages: low pressure, medium pressure, and high pressure, and it is also possible to switch between four stages or more. You can also do it.
また、上記第１実施例および第２実施例では、
圧縮エアを介して加圧を行なうものを示したが、
空気以外の他のガスを用いることもできる。 Furthermore, in the first and second embodiments,
The one that pressurizes via compressed air is shown, but
Other gases than air can also be used.
［発明の効果］
以上説明したように、本発明の低圧鋳造方法に
よるときは、金型内への溶湯の充填を低圧の圧縮
エアによつて行ない、金型内に充填された溶湯の
表面が凝固したと判断手段によつて判断された後
に、溶湯を加圧する圧縮エアの圧力を上昇させる
ようにしたので、バリの発生や中子の破損、およ
び目ざし等の不良の発生を大幅に低減しつつ、緻
密な鋳造品を得ることができる。[Effects of the Invention] As explained above, when using the low-pressure casting method of the present invention, the molten metal is filled into the mold using low-pressure compressed air, and the surface of the molten metal filled into the mold is After the determining means determines that the molten metal has solidified, the pressure of the compressed air that pressurizes the molten metal is increased, which greatly reduces the occurrence of burrs, core breakage, and defects such as aiming. At the same time, it is possible to obtain a precise casting product.
また、溶湯を金型に押し上げるための圧縮エア
の圧力を切換えるだけで上記の効果が得られるの
で、溶湯を鋳型で閉塞した状態で加圧する方法
や、溶湯を強制冷却して湯口を塞ぎ、その後加圧
する方法に比べて鋳造装置を大幅に簡素化するこ
とができる。 In addition, the above effect can be obtained simply by changing the pressure of the compressed air used to push the molten metal up into the mold, so it is possible to obtain the above effect by simply changing the pressure of the compressed air used to push the molten metal up into the mold. The casting equipment can be significantly simplified compared to the pressurizing method.
さらに、金型内に充填された溶湯は金型との熱
交換によつて強制冷却されるので、溶湯の表面の
凝固時間の短縮もはかれ、生産性の向上もはかれ
る。そして、溶湯の表面が凝固した後は、高圧の
圧縮エアに切換えられるため、押湯効果が著しく
向上し、製品不良率の低減を図ることができると
いう効果も得られる。 Furthermore, since the molten metal filled in the mold is forcibly cooled by heat exchange with the mold, the solidification time of the surface of the molten metal can be shortened, and productivity can also be improved. After the surface of the molten metal has solidified, the system is switched to high-pressure compressed air, which significantly improves the feeder effect and reduces the product defect rate.
第１図は本発明の第１実施例を実施するための
低圧鋳造装置の断面図、第２図は本発明の第１実
施例を実施するためのタイムチヤート、第３図は
本発明の第２実施例を実施するための低圧鋳造装
置の断面図、である。
１……低圧鋳造機、１ａ……内部空間、１ｂ…
…炉、２……溶湯、３，４……蓋体、５……金
型、５ａ……キヤビテイ、６……溶湯導入管、７
……圧縮エア供給源、８，９，１５，１８……管
路、１０，１６……減圧弁、１１……低圧加圧用
電磁弁、１２……チエツク弁、１３……圧力セン
サ、１４……アンプ・タイマ装置、１４ｂ……判
断手段（タイマ装置）、１７……高圧加圧用電磁
弁、２０……判断手段（温度センサ）、２１……
接点付温度計、ａ……加圧開始時点、ｂ……溶湯
充填完了時点、ｃ……高圧加圧開始時点、ｄ……
加圧完了時点、ｅ……排気完了時点、……溶湯
充填完了時の圧力、……低圧加圧時の圧力、
……高圧加圧時の圧力、Ｔ……表面凝固に要する
時間。
FIG. 1 is a cross-sectional view of a low-pressure casting apparatus for implementing the first embodiment of the present invention, FIG. 2 is a time chart for implementing the first embodiment of the present invention, and FIG. FIG. 2 is a cross-sectional view of a low-pressure casting apparatus for carrying out a second embodiment. 1...Low pressure casting machine, 1a...Inner space, 1b...
... Furnace, 2 ... Molten metal, 3, 4 ... Lid, 5 ... Mold, 5a ... Cavity, 6 ... Molten metal introduction pipe, 7
... Compressed air supply source, 8, 9, 15, 18 ... Pipe line, 10, 16 ... Pressure reducing valve, 11 ... Solenoid valve for low pressure pressurization, 12 ... Check valve, 13 ... Pressure sensor, 14 ... ...Amplifier/timer device, 14b... Judgment means (timer device), 17... Solenoid valve for high pressure pressurization, 20... Judgment means (temperature sensor), 21...
Thermometer with contact, a... At the start of pressurization, b... At the time of completion of molten metal filling, c... At the start of high pressure pressurization, d...
At the time of completion of pressurization, e... At the time of completion of evacuation, ... Pressure at the time of completion of molten metal filling, ... Pressure at the time of low pressure pressurization,
...Pressure during high pressure application, T...Time required for surface solidification.
Claims (1)
て該溶湯を金型内に充填し、該金型内に充填され
た溶湯の表面が凝固する温度よりも低下したと判
断手段によつて判断された後に、前記圧縮エアの
圧力を上昇させて金型内の溶湯を加圧することを
特徴とする低圧鋳造方法。 ２ 前記判断手段が、溶湯の充填完了時から溶湯
表面が凝固するに十分な時間を設定するタイマ装
置である特許請求の範囲第１項に記載の低圧鋳造
方法。 ３ 前記判断手段が、溶湯の表面温度を間接的に
検知する温度センサである特許請求の範囲第１項
に記載の低圧鋳造方法。[Claims] 1 The molten metal in the furnace is pushed up by low-pressure compressed air to fill the molten metal into a mold, and the temperature is lower than that at which the surface of the molten metal filled in the mold solidifies. A low-pressure casting method, characterized in that, after the determining means determines that the molten metal is in the mold, the pressure of the compressed air is increased to pressurize the molten metal in the mold. 2. The low-pressure casting method according to claim 1, wherein the determining means is a timer device that sets a time sufficient for the surface of the molten metal to solidify after completion of filling the molten metal. 3. The low-pressure casting method according to claim 1, wherein the determining means is a temperature sensor that indirectly detects the surface temperature of the molten metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14552282A JPS5935874A (en) | 1982-08-24 | 1982-08-24 | Low-pressure casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14552282A JPS5935874A (en) | 1982-08-24 | 1982-08-24 | Low-pressure casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5935874A JPS5935874A (en) | 1984-02-27 |
| JPH0342990B2 true JPH0342990B2 (en) | 1991-06-28 |
Family
ID=15387165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14552282A Granted JPS5935874A (en) | 1982-08-24 | 1982-08-24 | Low-pressure casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5935874A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0685992B2 (en) * | 1987-12-01 | 1994-11-02 | 本田技研工業株式会社 | Pressure cooling control method for molten metal in low pressure casting |
| RU2312738C1 (en) * | 2006-02-09 | 2007-12-20 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Investment casting method at pressure crystallization and apparatus for performing the same |
| WO2010078201A1 (en) * | 2008-12-31 | 2010-07-08 | Tenedora Nemak, S.A. De C.V. | Low-pressure sand casting of aluminum alloy cylinder engine parts |
| JP5339987B2 (en) * | 2009-03-27 | 2013-11-13 | 本田技研工業株式会社 | Casting machine control device |
| CN106807919B (en) * | 2015-11-27 | 2019-04-05 | 冯志军 | A kind of dedicated unit manufacturing semi-solid light alloy casting low pressure casting one-step method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51131421A (en) * | 1975-05-12 | 1976-11-15 | Hitachi Ltd | Apparatus for melt forging |
| JPS568705A (en) * | 1979-06-29 | 1981-01-29 | Goodyear Tire & Rubber | Truck tire for heavy body |
-
1982
- 1982-08-24 JP JP14552282A patent/JPS5935874A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51131421A (en) * | 1975-05-12 | 1976-11-15 | Hitachi Ltd | Apparatus for melt forging |
| JPS568705A (en) * | 1979-06-29 | 1981-01-29 | Goodyear Tire & Rubber | Truck tire for heavy body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5935874A (en) | 1984-02-27 |
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