JPH0139868B2 - - Google Patents
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- Publication number
- JPH0139868B2 JPH0139868B2 JP54121966A JP12196679A JPH0139868B2 JP H0139868 B2 JPH0139868 B2 JP H0139868B2 JP 54121966 A JP54121966 A JP 54121966A JP 12196679 A JP12196679 A JP 12196679A JP H0139868 B2 JPH0139868 B2 JP H0139868B2
- Authority
- JP
- Japan
- Prior art keywords
- pressurizing chamber
- pressure
- casting
- lower pressurizing
- chamber
- 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
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Description
【発明の詳細な説明】 本発明は背圧鋳造法に関するものである。[Detailed description of the invention] The present invention relates to a backpressure casting method.
加圧下における低圧鋳造法は差圧鋳造法として
良く知られているが、次のような欠点がある。 Low-pressure casting under pressure is well known as differential pressure casting, but it has the following drawbacks.
(1) 下部加圧室、上部加圧室を同時同加圧する際
給湯管内部も同圧にしながら加圧する必要があ
り、特殊な機構を要する。(1) When pressurizing the lower pressurized chamber and the upper pressurized chamber at the same time, it is necessary to pressurize the inside of the hot water supply pipe while maintaining the same pressure, which requires a special mechanism.
(2) 下部加圧室、上部加圧室を加圧下に保つた時
点から鋳込み開始（差圧をつける）するために
鋳込み速度の微妙な制御が難しく肉厚変動の大
きな部品の鋳造に適さない。(2) Casting starts (applies differential pressure) when the lower pressurized chamber and upper pressurized chamber are kept under pressure, making it difficult to precisely control the casting speed and not suitable for casting parts with large wall thickness variations. .
(3) 薄肉鋳物では凝固が早すぎるため湯廻わり不
良を生じやすい。(3) Thin-walled castings solidify too quickly, which tends to cause poor circulation.
(4) 下部加圧室、上部加圧室の同時加圧、同時排
気によるロスタイムが生じ、マシーンサイクル
タイムが長くなる。(4) Simultaneous pressurization and simultaneous evacuation of the lower pressurizing chamber and upper pressurizing chamber causes loss time, lengthening the machine cycle time.
差圧鋳造法は第１図に示すように下部加圧室
Ａ、上部加圧室Ｂを当初圧力P2まで加圧し、そ
れから上部加圧室Ｂを圧力P1まて減圧（P2＞P1）
または逆に上部加圧室Ｂを圧力P2に保つて下部
加圧室Ａを圧力P3まて加圧（P3＞P2）すること
により圧力差をつけて鋳込みを行なうものであ
る。 In the differential pressure casting method, as shown in Fig. 1, the lower pressurized chamber A and the upper pressurized chamber B are initially pressurized to a pressure P 2 , and then the upper pressurized chamber B is depressurized to a pressure P 1 (P 2 > P 1 )
Or conversely, the upper pressurizing chamber B is kept at the pressure P2 and the lower pressurizing chamber A is pressurized to the pressure P3 ( P3 > P2 ), thereby performing casting with a pressure difference.
この場合圧力差を作る早さにより給湯管内の溶
湯の上昇速度が決まり、到達圧力差が溶湯を上方
に押し上げる力すなわち押湯効果になるわけであ
る。 In this case, the speed at which the pressure difference is created determines the rising speed of the molten metal in the hot water supply pipe, and the ultimate pressure difference becomes a force that pushes the molten metal upward, ie, a feeder effect.
圧力差を作る早さは薄肉鋳物に対して特に重要
になるが、高圧下での圧力差であるため微妙なコ
ントロールが極めて難しい。 The speed of creating a pressure difference is especially important for thin-walled castings, but since the pressure difference is under high pressure, delicate control is extremely difficult.
したがつて、差圧鋳造法では薄肉鋳物の鋳造は
困難であつた。 Therefore, it has been difficult to cast thin-walled castings using the differential pressure casting method.
なお、第１図中T2→T3は鋳込時間、T3→T4は
チルタイム、T4→T5は押湯落し、T0→T1は上、
下部加圧室の同時加圧時間、T6は排気時である。 In Figure 1, T 2 → T 3 is the casting time, T 3 → T 4 is the chill time, T 4 → T 5 is the riser drop, T 0 → T 1 is the top,
The simultaneous pressurization time of the lower pressurization chamber, T 6 is the time of evacuation.
本発明は上記の事情に鑑みなされたものであつ
て、その目的とするところは極めて微妙なコント
ロールが可能になり肉厚の大小、肉厚変動の大き
な鋳物にかかわらず鋳造可能になるし、また、差
圧鋳造のように給湯管内部、鋳型内部キヤビテイ
ーを同圧にするための特殊な機構を必要としない
ですむし、鋳造品の品質は差圧鋳造品と同等にな
る背圧鋳造法を提供することにある。 The present invention has been made in view of the above circumstances, and its purpose is to enable extremely delicate control and to enable casting regardless of the size of the wall thickness or castings with large variations in wall thickness. , provides a back pressure casting method that does not require a special mechanism to maintain the same pressure inside the hot water pipe and the cavity inside the mold unlike differential pressure casting, and the quality of the cast product is equivalent to that of differential pressure casting. It's about doing.
以下、本発明は第２図以下を参照して説明す
る。 Hereinafter, the present invention will be explained with reference to FIG. 2 and subsequent figures.
図面中１は炉体であり、炉体１内はダイベース
２により上部加圧室３と下部加圧室４とにより区
分されている。 In the drawing, 1 is a furnace body, and the inside of the furnace body 1 is divided by a die base 2 into an upper pressurizing chamber 3 and a lower pressurizing chamber 4.
ダイベース２には給湯管５が設けてあり、給湯
管５は下部加圧室４内に吊下してあり、給湯管５
は下部加圧室４内に設けたるつぼ６内に挿入して
ある。 The die base 2 is provided with a hot water supply pipe 5, and the hot water supply pipe 5 is suspended in the lower pressurizing chamber 4.
is inserted into a crucible 6 provided in the lower pressurizing chamber 4.
上、下部加圧室３，４にはそれぞれ圧縮空気の
給排口７，８が設けてある。 The upper and lower pressurized chambers 3 and 4 are provided with compressed air supply and discharge ports 7 and 8, respectively.
図面中９は保温用ヒータである。 9 in the drawing is a heat retention heater.
第３図に空圧操作系を示す。空圧操作系は流量
調整回路１０と加圧力・圧力バランス調整回路１
１とより構成される。 Figure 3 shows the pneumatic operation system. The pneumatic operation system includes a flow rate adjustment circuit 10 and a pressure/pressure balance adjustment circuit 1.
1.
流量調整回路１０は、１次減圧弁１２とストレ
ーナ１３と流量調整弁１４と３方電磁弁１５と弁
操作圧減圧弁１６とを備えている。また、加圧
力・圧力バランス調整回路１１は、三方切換弁１
７と圧力調整弁１９と三方切換弁２０とテストタ
ンク２１とを有する上部加圧室回路１８および圧
力調整弁２２と三方切換弁２３とテストタンク２
４とを有する下部加圧室回路２５を備えている。 The flow rate adjustment circuit 10 includes a primary pressure reducing valve 12, a strainer 13, a flow rate regulating valve 14, a three-way solenoid valve 15, and a valve operating pressure reducing valve 16. In addition, the pressurizing force/pressure balance adjustment circuit 11 includes a three-way switching valve 1
7, a pressure regulating valve 19, a three-way switching valve 20, and a test tank 21; an upper pressurizing chamber circuit 18; a pressure regulating valve 22; a three-way switching valve 23;
A lower pressurizing chamber circuit 25 having 4 is provided.
そして、上部加圧室回路１８はストツプバルブ
２６を介して上部加圧室３の給排口７に通じてお
り、下部加圧室回路２５はストツプバルブ２７を
介して下部加圧室４の給排口８に通じている。 The upper pressurizing chamber circuit 18 communicates with the supply/discharge port 7 of the upper pressurizing chamber 3 via a stop valve 26 , and the lower pressurizing chamber circuit 25 communicates with the supply/discharge port of the lower pressurizing chamber 4 via a stop valve 27 . It leads to 8.
しかして、下部加圧室４、上部加圧室３を同時
に加圧せずに予め下部加圧室４の空気流量を上部
加圧室３の流量より多くなるように上・下部加圧
室回路１８，２５の圧力調整弁１９，２２を調整
しておき、加圧を始める。 Therefore, without pressurizing the lower pressurizing chamber 4 and the upper pressurizing chamber 3 at the same time, the upper and lower pressurizing chamber circuits are set so that the air flow rate of the lower pressurizing chamber 4 is higher than the flow rate of the upper pressurizing chamber 3. After adjusting the pressure regulating valves 19 and 22 of 18 and 25, pressurization is started.
したがつて、第４図の加圧曲線を得る。 Therefore, the pressure curve shown in FIG. 4 is obtained.
この場合、t0は加圧開始時、t1は鋳込開始時、
t2は鋳込完了時、t2→t4はチルタイム、t4は排気
時、t0→t1は溶湯逆ヘツド分の溶湯上昇時間であ
る。 In this case, t 0 is the start of pressurization, t 1 is the start of casting,
t 2 is the time of completion of pouring, t 2 → t 4 is the chill time, t 4 is the exhaust time, and t 0 → t 1 is the molten metal rising time for the molten metal reverse head.
すなわち上・下部加圧室３，４の圧力差P2−
P1により、るつぼ６内の溶湯が給湯管５を上昇
し、上部加圧室３内に収容された鋳型内に注湯さ
れる。 In other words, the pressure difference between the upper and lower pressurized chambers 3 and 4 P 2 −
At P 1 , the molten metal in the crucible 6 rises through the hot water supply pipe 5 and is poured into the mold housed in the upper pressurizing chamber 3 .
本発明方法の場合、第４図に示すように比較的
低圧力のうちに鋳込みが開始され圧力差をつける
速度は従来の低圧鋳造のようにP1−P′3／t2で与
えられる。 In the case of the method of the present invention, casting is started at a relatively low pressure as shown in FIG. 4, and the speed at which the pressure difference is created is given by P 1 -P' 3 /t 2 as in conventional low pressure casting.
したがつて、t2までの下部加圧室４の圧力、上
部加圧室３の圧力のとりかたで勾配が決められる
ので微妙なコントロールが可能である。したがつ
て、どんな薄肉鋳物でも加圧曲線をコントロール
することにより鋳込みが可能であり、鋳込完了後
更に圧力が上昇して従来の差圧鋳造と全く同じ効
果が得られる。 Therefore, since the gradient is determined by the pressure in the lower pressurizing chamber 4 and the pressure in the upper pressurizing chamber 3 up to t2 , delicate control is possible. Therefore, any thin-walled casting can be cast by controlling the pressure curve, and after the casting is completed, the pressure is further increased to achieve exactly the same effect as conventional differential pressure casting.
しかも差圧鋳造に比べT0→T2およびT4→T6ま
でのロスタイムがなくT0→T2間に鋳型内部、給
湯管内も同圧にする特殊な機構を必要としない。 Moreover, compared to differential pressure casting, there is no loss time from T 0 to T 2 and T 4 to T 6 , and no special mechanism is required to maintain the same pressure inside the mold and in the hot water pipe between T 0 and T 2 .
本発明方法により鋳造された鋳造物（JIS
AC4A−T6相当品）の機械的性質（実体強度σB、
伸びε％）を第５図および第６図に、更に従来の
重力鋳造法により鋳造された鋳造物（JIS AC4A
−T6相当品）の機械的性質を第７図および第８
図にそれぞれ示す。 Castings cast by the method of the present invention (JIS
AC4A-T6 equivalent product) mechanical properties (physical strength σB,
Fig. 5 and Fig. 6 show the elongation ε%) of the castings cast by the conventional gravity casting method (JIS AC4A
- T6 equivalent) mechanical properties are shown in Figures 7 and 8.
Each is shown in the figure.
また、本発明方法により鋳造された鋳造物
（JIS AC4D−T6相当品）の機械的性質を第９図
および第１０図に、従来の重力鋳造法により鋳造
された鋳造物（JIS AC4D−T6相当品）の機械
的性質を第１１図および第１２図にそれぞれ示
す。 In addition, the mechanical properties of the castings (equivalent to JIS AC4D-T6) cast by the method of the present invention are shown in Figures 9 and 10, and the mechanical properties of the castings (equivalent to JIS AC4D-T6) cast by the conventional gravity casting method are shown in Figures 9 and 10. The mechanical properties of the product) are shown in Figures 11 and 12, respectively.
なお、空圧操作系は第３図に示すように上部加
圧室回路１８と下部加圧室回路２５とに導入され
る空気圧及びその流量を一つの流量調整回路１０
から供給するようにしたが、これに限らず、第１
３図に示すように上部加圧室回路１８と下部加圧
室回路２５とに導入される空気圧及びその流量
を、それぞれ独自の流量調整回路１０′，１０″か
ら供給するようにしてもよい。 The pneumatic operation system, as shown in FIG.
However, it is not limited to this.
As shown in FIG. 3, the air pressure and flow rate introduced into the upper pressurizing chamber circuit 18 and the lower pressurizing chamber circuit 25 may be supplied from independent flow rate adjusting circuits 10' and 10'', respectively.
なお、流量調整回路１０′，１０″の構成は流量
調整回路１０と同構成である。 The configuration of the flow rate adjustment circuits 10' and 10'' is the same as that of the flow rate adjustment circuit 10.
本発明は以上詳述したように、炉体１内をダイ
ベース２により上部加圧室３と下部加圧室４とに
区分し、下部加圧室４内にるつぼ６を設け、ダイ
ベース２に給湯管５を下部加圧室４内に吊下する
ように設けると共に、給湯管５をるつぼ６内に挿
入し、上、下部加圧室３，４にそれぞれ圧縮空気
の給排口７，８を設けたものにおいて、下部加圧
室４、上部加圧室３を同圧に加圧せず予め下部加
圧室４の空気流量を上部加圧室３の空気流量より
多くなるようにして加圧を開始し下部加圧室４側
の溶湯を給湯管５を介して上部加圧室３内の鋳型
に注湯するようにしたことを特徴とする背圧鋳造
方法である。 As described in detail above, the present invention divides the interior of the furnace body 1 into an upper pressurizing chamber 3 and a lower pressurizing chamber 4 by the die base 2, a crucible 6 is provided in the lower pressurizing chamber 4, and hot water is supplied to the die base 2. A pipe 5 is provided so as to be suspended in the lower pressurizing chamber 4, a hot water supply pipe 5 is inserted into the crucible 6, and compressed air supply/discharge ports 7, 8 are provided in the upper and lower pressurizing chambers 3, 4, respectively. In the case where the lower pressurizing chamber 4 and the upper pressurizing chamber 3 are not pressurized to the same pressure, the air flow rate in the lower pressurizing chamber 4 is made to be higher than the air flow rate in the upper pressurizing chamber 3 in advance. This back pressure casting method is characterized in that the molten metal from the lower pressurizing chamber 4 side is poured into the mold in the upper pressurizing chamber 3 via the hot water supply pipe 5.
したがつて、上記のように加圧開始点から上、
下部加圧室３，４に差圧をつけるようにしたもの
で、上部加圧室３の設定圧力までの時間までの
上、下部加圧室３，４の圧力のとりかたで加圧曲
線の勾配が決められるので極めて微妙なコントロ
ールが可能になり肉厚の大小、肉厚変動の大きな
鋳物にかかわらず鋳造可能になる。 Therefore, as mentioned above, from the pressurization starting point,
A pressure difference is applied to the lower pressurizing chambers 3 and 4, and the pressure curve is determined by the pressure in the upper and lower pressurizing chambers 3 and 4 until the set pressure in the upper pressurizing chamber 3 is reached. Since the slope of the casting can be determined, extremely delicate control is possible, and casting is possible regardless of whether the wall thickness is large or small, or castings with large wall thickness variations can be cast.
また、差圧鋳造のように給湯管内部、鋳型内部
キヤビテイーを同圧にするための特殊な機構を必
要としないですむし、鋳造品の品質は差圧鋳造品
と同等になる。 In addition, unlike differential pressure casting, there is no need for a special mechanism to maintain the same pressure inside the hot water pipe and the cavity inside the mold, and the quality of the cast product is equal to that of differential pressure casting.
第１図は従来の差圧鋳造の場合の加圧曲線、第
２図は本発明方法に用いる炉の縦断面図、第３図
は空圧操作系の構成説明図、第４図は本発明によ
る鋳造の場合の加圧曲線図、第５図、第６図は本
発明方法による鋳造品（JIS AC4A−T6相当品）
の機械的性質の説明図、第７図、第８図は重力鋳
造法による鋳造品の機械的性質の説明図、第９
図、第１０図は本発明方法による鋳造品（JIS
AC4D−T6相当品）の機械的性質の説明図、第
１１図、第１２図は重力鋳造法による鋳造品の機
械的性質の説明図、第１３図は空圧操作系の他の
実施態様を示す構成説明図である。
１は炉体、２はダイベース、３は上部加圧室、
４は下部加圧室、５は給湯管、６はるつぼ、７，
８は給排口。
Fig. 1 is a pressurization curve for conventional differential pressure casting, Fig. 2 is a vertical cross-sectional view of a furnace used in the method of the present invention, Fig. 3 is an explanatory diagram of the configuration of the pneumatic operation system, and Fig. 4 is a diagram of the present invention. Figures 5 and 6 are pressurization curve diagrams for casting by the method of the present invention (JIS AC4A-T6 equivalent).
Figures 7 and 8 are explanatory diagrams of the mechanical properties of products cast by the gravity casting method.
Figure 10 shows a cast product (JIS
Figures 11 and 12 are illustrations of the mechanical properties of a cast product made by gravity casting. Figure 13 is an illustration of another embodiment of the pneumatic operation system. FIG. 1 is a furnace body, 2 is a die base, 3 is an upper pressurizing chamber,
4 is a lower pressure chamber, 5 is a hot water pipe, 6 is a crucible, 7,
8 is the supply/discharge port.
Claims (1)
と下部加圧室４とに区分し、下部加圧室４内にる
つぼ６を設け、ダイベース２に給湯管５を下部加
圧室４内に吊下するようにして設けると共に、給
湯管５をるつぼ６内に挿入し、上、下部加圧室
３，４にそれぞれ圧縮空気の給排口７，８を設け
たものにおいて、下部加圧室４、上部加圧室３を
同圧に加圧せず予め下部加圧室４の空気流量を上
部加圧室３の空気流量より多くなるようにして加
圧を開始し下部加圧室４側の溶湯を給湯管５を介
して上部加圧室３内の鋳型に注湯するようにした
ことを特徴とする背圧鋳造法。1 Inside the furnace body 1, the upper pressurized chamber 3 is formed by the die base 2.
and a lower pressurizing chamber 4, a crucible 6 is provided in the lower pressurizing chamber 4, a hot water supply pipe 5 is provided on the die base 2 so as to be suspended in the lower pressurizing chamber 4, and the hot water supply pipe 5 is In a crucible that is inserted into the crucible 6 and has compressed air supply and discharge ports 7 and 8 in the upper and lower pressurizing chambers 3 and 4, respectively, the lower pressurizing chamber 4 and the upper pressurizing chamber 3 are pressurized to the same pressure. Instead, pressurization is started by making the air flow rate in the lower pressurizing chamber 4 higher than the air flow rate in the upper pressurizing chamber 3, and the molten metal in the lower pressurizing chamber 4 is transferred to the upper pressurizing chamber via the hot water supply pipe 5. 3. A back pressure casting method characterized by pouring metal into a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12196679A JPS5647262A (en) | 1979-09-25 | 1979-09-25 | Back pressure casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12196679A JPS5647262A (en) | 1979-09-25 | 1979-09-25 | Back pressure casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5647262A JPS5647262A (en) | 1981-04-28 |
| JPH0139868B2 true JPH0139868B2 (en) | 1989-08-23 |
Family
ID=14824284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12196679A Granted JPS5647262A (en) | 1979-09-25 | 1979-09-25 | Back pressure casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5647262A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2616363B1 (en) * | 1987-06-11 | 1991-04-19 | Cegedur | METHOD AND DEVICE FOR MOLDING SAND INTO LIGHT ALLOY MATRIX COMPOSITES AND FIBROUS INSERT |
| DE3924742A1 (en) * | 1989-07-26 | 1991-01-31 | Alcan Gmbh | LOW-PRESSURE CHILLING MOLDING METHOD FOR CASTING METAL CASTING PARTS |
| CN108580847B (en) * | 2018-07-26 | 2020-09-01 | 哈尔滨工业大学 | Nonlinear pressurization control system for differential pressure casting forming of complex metal component |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123927A (en) * | 1976-04-12 | 1977-10-18 | Komatsu Mfg Co Ltd | Differential pressure casting machine |
-
1979
- 1979-09-25 JP JP12196679A patent/JPS5647262A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5647262A (en) | 1981-04-28 |
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