JP4524691B2 - Mold decompression method - Google Patents
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- JP4524691B2 JP4524691B2 JP2007151137A JP2007151137A JP4524691B2 JP 4524691 B2 JP4524691 B2 JP 4524691B2 JP 2007151137 A JP2007151137 A JP 2007151137A JP 2007151137 A JP2007151137 A JP 2007151137A JP 4524691 B2 JP4524691 B2 JP 4524691B2
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本発明は鋳型の減圧方法に関する。さらに詳しくは、消失模型を使用した鋳造法の注湯工程における減圧方法に関する。 The present invention relates to a vacuum how the mold. More particularly, it relates to a vacuum how the casting pouring process using evaporative pattern.
従来より、消失模型を使用した鋳造法においては、まず発泡樹脂で作製される消失模型を製品型としたのち、同じ発泡樹脂で作製された湯口、湯道、堰、押し湯部などを形成し、これらを消失模型の外側に組み立てて鋳物砂に埋設して鋳型を作製する。ついで、この湯口に溶湯（溶融金属）を注入（鋳込み）して、溶湯の熱により消失模型を分解ガス化させて消失させ、消失模型が存在していた製品空間（キャビティ）に充填され凝固することにより鋳物製品が製造される。 Conventionally, in the casting method using the disappearance model, first the disappearance model made of foamed resin is made into a product type, and then the gate, runner, weir, feeder etc. made of the same foamed resin are formed. These are assembled outside the disappearance model and embedded in foundry sand to produce a mold. Next, molten metal (molten metal) is injected (cast) into the gate, and the disappearance model is decomposed and gasified by the heat of the molten metal, and the product space (cavity) where the disappearance model existed is filled and solidified. As a result, a cast product is manufactured.
しかしながら、発泡ポリスチレンなどを初めとする消失材料は、炭化水素を主な組成物としており、熱により分解することにより気化したり、炭化物に分解されている。こうして生成されたガスや炭化物などが鋳物製品内に残留することで、鋳物製品のガス欠陥などの原因となる。 However, disappearing materials such as expanded polystyrene have hydrocarbon as a main composition, and are vaporized or decomposed into carbides by being decomposed by heat. The gas, carbide, and the like thus generated remain in the casting product, causing a gas defect in the casting product.
このような問題を解決するためにたとえば、吸引鋳枠内を、ゲ−ジ圧で−４６．７ｋＰａより真空に近い圧力から、ゲ−ジ圧で−４６．７ｋＰａより大気圧に近い圧力に切り替えて注湯を行う鋳型の減圧方法がある(特許文献１参照)。
鋳型内を吸引する方法は、鋳込み時に消失模型の燃焼ガスを吸引するためガス欠陥の防止や、鋳型キャビティ内を吸引し減圧するため良好な溶湯の湯流れ性、鋳型砂に乾燥砂を使用する場合で鋳込み時の鋳型強度が高くなり型くずれや型張りなど鋳型または鋳型砂に起因する不具合の防止などの効果を有している。これらの効果は吸引圧力が低圧力になるほど大きくなる。
In order to solve such problems, for example, the inside of the suction casting frame is switched from a pressure close to -46.7 kPa in vacuum at a gage pressure to a pressure close to atmospheric pressure in a gage pressure from -46.7 kPa. There is a method for depressurizing a mold for performing pouring (see Patent Document 1).
The method of sucking the inside of the mold is to prevent gas defects because the disappeared model combustion gas is sucked at the time of casting, and the molten metal flow is good because the inside of the mold cavity is sucked and decompressed, and dry sand is used as the mold sand. In some cases, the strength of the mold at the time of casting is increased, and there is an effect such as prevention of defects caused by the mold or the mold sand, such as mold deformation and mold tension. These effects increase as the suction pressure becomes lower.
つぎに吸引圧力が低圧力になるほど大きくなる問題について説明する。図６に示される鋳型１０１は、上下２段に配設された消失模型（製品型）１０２に湯口１０３、湯道１０４および堰１０５から構成される湯口系や、押し湯部１０６が組み付けられたのち、鋳枠１０７内に配置し、鋳物砂１０８が充填されている。そして、鋳枠１０７のチャンバーＣの吸引管Ｃ１には、レシーバータンク１０９を介して真空ポンプ１１０が接続されている。なお、符号１１１は圧力調整器である。
この鋳型１０１において、図７に示されるように、吸引圧力を低圧力、たとえばゲージ圧で−６０．０４ｋＰａ（−４５０ｍｍＨｇ）にするほど鋳込みのときに最初の溶湯Ｍが著しく吸引されて、湯口系や、押し湯部１０６、消失模型１０２側に流れる。そして、この溶湯は鋳物砂１０８内の吸引力により、塗型が塗布されていない湯道１０４や、堰１０５、押し湯部１０６の周りの鋳物砂１０８の内壁面１０８ａに沿って吸着されて薄い金属皮膜１１２を形成する。そして、この金属皮膜１１２の熱により湯道１０４や、堰１０５、押し湯部１０６の消失材料が分解ガス化して消失し、この湯道１０４、堰１０５および押し湯部１０６を埋設した部分が空洞Ｓとなり、その後に鋳込まれた溶湯がこの空洞に流れて行く現象（以下、溶湯の先走り現象という）が見られる。
Next, a problem that becomes larger as the suction pressure becomes lower will be described. The mold 101 shown in FIG. 6 has a faucet system composed of a gate 103, a runner 104 and a weir 105, and a feeder section 106, assembled on a disappearance model (product mold) 102 arranged in two upper and lower stages. After that, it is placed in a casting frame 107 and filled with foundry sand 108. A vacuum pump 110 is connected to the suction pipe C <b> 1 of the chamber C of the casting frame 107 through a receiver tank 109. Reference numeral 111 denotes a pressure regulator.
In this mold 101, as shown in FIG. 7, the first molten metal M is remarkably sucked at the time of casting as the suction pressure is reduced to a low pressure, for example, −60.04 kPa (−450 mmHg) as a gauge pressure. Or, it flows to the hot-water supply part 106 and the disappearance model 102 side. The molten metal is adsorbed along the inner wall 108a of the casting sand 108 around the runner 104 where the coating mold is not applied, the weir 105 and the feeder 106 by the suction force in the molding sand 108, and is thin. A metal film 112 is formed. The lost material of the runner 104, the weir 105, and the feeder 106 is decomposed and lost by the heat of the metal coating 112, and the portion where the runner 104, the weir 105, and the feeder 106 are embedded is hollow. S is observed, and a phenomenon in which the molten metal cast thereafter flows into the cavity (hereinafter referred to as a “preceding phenomenon of the molten metal”) is observed.
このような現象が起こると、この湯口系の薄い金属皮膜１１２は通気性がないため、湯口系の消失材料の燃焼ガスは湯口系から排出されない。このため、湯口系に発生するガス欠陥や酸化物、異物欠陥は、製品部に移動し、製品部で欠陥となって残ることとなる。また、この先走り現象では、後から鋳込まれた溶湯と薄い金属皮膜が完全に溶け合わないために鋳造後の鋳物製品に湯境や湯じわといった欠陥が発生する問題がある。 When such a phenomenon occurs, the thin metal film 112 of the gate system does not have air permeability, so the combustion gas of the disappeared material of the gate system is not discharged from the gate system. For this reason, gas defects, oxides, and foreign matter defects generated in the gate system move to the product part and remain as defects in the product part. In addition, this pre-run phenomenon has a problem that defects such as a hot water boundary and a hot water wrinkle occur in the cast product after casting because the molten metal cast later and the thin metal film do not completely melt.
ここで、逆に吸引圧力を高圧力、たとえばゲージ圧で−３３．３４ｋＰａ（−１００ｍｍＨｇ）に近づけると、前記先走り現象は抑えられるが、消失材料の燃焼ガスの吸引および排出が不充分になったり、鋳込み時の湯流れが低下する問題がある。
そこで、本発明は、叙上の事情に鑑み、鋳込み時に薄い金属皮膜の形成を抑えることにより、ガス欠陥、異物欠陥、湯境や湯じわといった欠陥などを防止し、良好な鋳物製品を得ることができる鋳型の減圧方法を提供することを目的とする。
Conversely, if the suction pressure is close to a high pressure, for example, a gauge pressure of −33.34 kPa (−100 mmHg), the preceding phenomenon can be suppressed, but the suction and discharge of the lost material combustion gas may be insufficient. There is a problem that the flow of hot water during casting is lowered.
Therefore, in view of the above circumstances, the present invention prevents gas defects, foreign object defects, defects such as hot water boundaries and hot water wrinkles, etc. by suppressing the formation of a thin metal film during casting, and obtains a good casting product. and to provide a vacuum how the template can.
本発明の鋳型の減圧方法は、鋳型内を吸引しながら注湯工程を行う鋳型の減圧方法であって、前記注湯工程における注湯初期の終了まで、大気圧に近い所定の第１吸引圧力で前記鋳型内を吸引する工程と、前記注湯初期の終了時点から、前記所定の第１吸引圧力より低い所定の第２吸引圧力に切り替えて前記鋳型内を吸引する工程とを含むことを特徴としている。 The mold depressurization method of the present invention is a mold depressurization method in which the pouring process is performed while sucking the inside of the mold, and the predetermined first suction pressure close to the atmospheric pressure until the end of the initial pouring in the pouring process. And the step of sucking the mold by switching to a predetermined second suction pressure lower than the predetermined first suction pressure from the end of the initial pouring stage. It is said.
本発明によれば、注湯初期の終了時点から、大気圧に近い所定の第１吸引圧力より低い所定の第２吸引圧力に切り替えて注湯を行うことにより、溶湯の先走り現象による薄い金属皮膜の発生を抑えることができ、鋳型強度の確保、消失模型の燃焼ガスの排出、溶湯の湯流れ性の改善が可能となる。これにより、金属皮膜の部分に生じやすいガス欠陥、異物欠陥、湯境や湯じわといった欠陥などの発生を防止することができる。その結果、良好な鋳物製品を得ることができる。 According to the present invention, from the end point of the initial pouring, by switching to the predetermined second suction pressure lower than the predetermined first suction pressure close to the atmospheric pressure, the thin metal film due to the preceding phenomenon of the molten metal is performed. It is possible to suppress the generation of mold, to ensure the strength of the mold, to discharge the disappearing model combustion gas, and to improve the flowability of the molten metal. Thereby, it is possible to prevent the occurrence of gas defects, foreign object defects, defects such as a hot water boundary and hot water wrinkles that are likely to occur in the metal film portion. As a result, a good casting product can be obtained.
本発明において、注湯工程における注湯開始から注湯終了までの期間のうち、注湯開始から湯口系に溶湯が満たされ消失模型に入りだす時点までを注湯初期と称している。そして、本発明は、鋳型内の吸引圧力を注湯工程における注湯初期の終了時点から大気圧に近い所定の第１吸引圧力から低真空に近い所定の第２吸引圧力に切り替えて注湯を行う。
本発明は、消失模型が鋳枠内に配置されたのち、鋳物砂に埋設された鋳型を用いる消失模型鋳造法に適用することができる。
たとえば、前記消失模型鋳造法において、消失模型の材料には一般的に用いられるポリスチレンやポリメチルメタクリレートなどの発泡材料を使用することができる。また、この発泡材料には耐火度と通気性を有する塗型を施工した後、鋳型砂に埋設されるが、この際の塗型剤は一般的に消失模型鋳造用として公知のものを使用することができる。湯口系および押し湯部に関しては、消失模型と同様の材料を使用することもできる。
また、鋳物砂は、その種類を問わない。鋳物砂へ添加する粘結剤は酸硬化でもアルカリ硬化型など一般に公知の自硬性プロセスに採用される粘結剤とすることができる。
また、鋳型を密閉にするために鋳枠にシール材を用いることができる。このシール剤としては、プラスチック系の他に金属系やゴム系など充分な気密性を有する材質を用いることができる。
In the present invention, in the period from the start of pouring to the end of pouring in the pouring process, the period from the start of pouring to the point when the molten metal fills the pouring system and begins to disappear is called the initial stage of pouring. The present invention switches the suction pressure in the mold from a predetermined first suction pressure close to atmospheric pressure to a predetermined second suction pressure close to low vacuum from the end of the initial pouring process in the pouring process. Do.
The present invention can be applied to a disappearance model casting method using a mold embedded in foundry sand after the disappearance model is arranged in a casting frame.
For example, in the disappearance model casting method, foam materials such as polystyrene and polymethylmethacrylate which are generally used can be used as the material of the disappearance model. In addition, after applying a coating mold having fire resistance and breathability to this foamed material, it is embedded in the mold sand, and the coating agent used at this time is generally known for disappearance model casting. be able to. For the gate system and the feeder part, the same material as the disappearance model can also be used.
Moreover, the kind of foundry sand is not ask | required. The binder added to the foundry sand can be a binder used in a generally known self-hardening process, such as acid curing or alkali curing.
Further, a sealing material can be used for the casting frame in order to seal the mold. As the sealant, a material having sufficient airtightness such as a metal system or a rubber system can be used in addition to a plastic system.
以下、添付図面に基づいて本発明の鋳型の減圧方法および該減圧方法に用いる減圧装置を説明する。図１に示されるように、本発明の一実施の形態にかかわる減圧装置は、鋳型の減圧方法として消失模型鋳造法に適用した場合の減圧装置であって、鋳型１、該鋳型１の吸引配管経路Ａに連結される吸引機構１１、配管切替え装置１２および制御盤２１を備えている。
前記鋳型１は、本実施の形態の場合、チャンバー２とフィルタ付吸引管２ａを底部に有する有底形状の鋳枠３と、該鋳枠３内に上下２段に配設される消失模型４と、該消失模型４の周りに組み付けられた湯口５、湯道６、堰７および押し湯部８と、鋳枠３内に充填された鋳型砂９とから構成されている。
Hereinafter, a pressure reducing method for a mold according to the present invention and a pressure reducing device used for the pressure reducing method will be described with reference to the accompanying drawings. As shown in FIG. 1, a decompression device according to an embodiment of the present invention is a decompression device when applied to a disappearance model casting method as a decompression method of a mold, and includes a mold 1 and a suction pipe for the mold 1. A suction mechanism 11 connected to the path A, a pipe switching device 12 and a control panel 21 are provided.
In the case of the present embodiment, the mold 1 has a bottomed casting frame 3 having a chamber 2 and a suction pipe 2a with a filter at the bottom, and a disappearance model 4 arranged in two stages in the casting frame 3. And a pouring gate 5, a runway 6, a weir 7, and a feeder part 8 assembled around the vanishing model 4, and a mold sand 9 filled in the casting frame 3.
本実施の形態では、前記吸引配管経路Ａの途中に接続される配管切替え装置１２から吸引機構１１までの吸引配管経路Ａが２つに分岐する真空配管系統Ａ１、Ａ２にされている。そして、前記制御盤２１は配管切替え装置１２に連結されている。この配管切替え装置１２としては、たとえばバルブを用いた切替え装置から構成される装置を用いることができる。
なお、鋳型１から配管切替え装置１２までの吸引配管経路Ａの配管を主吸引配管Ｐとし、配管切替え装置１２から吸引機構１１までの吸引配管経路Ａのうち真空配管系統Ａ１、Ａ２の配管を第１分岐吸引配管Ｐ１および第２分岐吸引配管Ｐ２とする。
前記鋳型１と配管切替え装置１２とを接続する主吸引配管Ｐは、チャンバー２の吸引部に着脱自在に連結されている。また、前記吸引機構１１は、本実施の形態では、第１分岐吸引配管Ｐ１および第２分岐吸引配管Ｐ２に接続される、真空ポンプ１１ａと、圧力調整器１１ｂと、レシーバータンク１１ｃとから構成されているが、本発明においては、これに限定されるものではない。
In this embodiment, the suction piping path A from the pipe switching device 12 connected to the suction piping path A to the suction mechanism 11 is divided into two vacuum piping systems A1 and A2. The control panel 21 is connected to the pipe switching device 12. As the pipe switching device 12, for example, a device constituted by a switching device using a valve can be used.
Note that the piping of the suction piping path A from the mold 1 to the piping switching device 12 is a main suction piping P, and the piping of the vacuum piping systems A1 and A2 in the suction piping route A from the piping switching device 12 to the suction mechanism 11 is the first. The first branch suction pipe P1 and the second branch suction pipe P2 are used.
A main suction pipe P connecting the mold 1 and the pipe switching device 12 is detachably connected to the suction part of the chamber 2. In the present embodiment, the suction mechanism 11 includes a vacuum pump 11a, a pressure regulator 11b, and a receiver tank 11c connected to the first branch suction pipe P1 and the second branch suction pipe P2. However, the present invention is not limited to this.
前記制御盤２１は、配管切替え装置１２を操作して注湯工程における注湯初期の終了時点から注湯初期の所定の第１吸引圧力より低い所定の第２吸引圧力に切り替える制御をする構成であれば、本発明において、とくに限定されるものではない。たとえば図２に示されるように、検知手段として、下段の消失模型４に組み付けられた堰７に近い湯道６の位置ａと該堰７から消失模型４に溶湯が流入する位置（堰７と消失模型４との境目より少し上流位置）ｂとに埋め込まれた導電線３１に結線された電池３２と電球３３とからなるタッチセンサ３４を用いて、あらかじめ注湯実験により図３〜４に示されるように、溶湯の注入（注湯開始）から溶湯Ｍが湯道６を通過して堰７から消失模型４に流入したときに知らせる電球３３の点灯までの時間を算出する。本実施の形態では、この注湯開始から電球３３の点灯までの時間として注湯初期の終了を知ることができる。 The control panel 21 is configured to control the pipe switching device 12 so as to switch from the end of the initial pouring process to the predetermined second suction pressure lower than the predetermined first suction pressure in the initial pouring process. If there is, it is not particularly limited in the present invention. For example, as shown in FIG. 2, as detection means, the position a of the runner 6 near the weir 7 assembled to the lower disappearance model 4 and the position where the molten metal flows into the disappearance model 4 from the weir 7 (weir 7 and As shown in FIGS. 3 to 4 by a hot water pouring experiment in advance using a touch sensor 34 comprising a battery 32 and a light bulb 33 connected to a conductive wire 31 embedded at a position slightly upstream from the boundary with the disappearance model 4. As shown, the time from the injection of molten metal (starting of pouring) to the lighting of the light bulb 33 to be notified when the molten metal M passes through the runner 6 and flows into the disappearing model 4 from the weir 7 is calculated. In the present embodiment, the end of the initial pouring can be known as the time from the start of pouring to the lighting of the light bulb 33.
このため、前記制御盤２１は、注湯初期に掛かる時間の記憶部と、注湯開始信号を入力してから注湯初期の終了時点の信号に基づいて、前記配管切替え装置１２を作動して、注湯初期の終了時点まで大気圧に近い所定の第１吸引圧力により鋳型１を吸引していた真空配管系統Ａ１から低真空に近い所定の第２吸引圧力により吸引する真空配管系統Ａ２に切り替える制御部とで構成されている。
本発明において、前記所定の第１吸引圧力および所定の第２吸引圧力は適宜選定することができるが、たとえば前記所定の第１吸引圧力としてはゲージ圧で−１ｍｍＨｇ〜−１００ｍｍＨｇであり、前記所定の第２吸引圧力としてはゲージ圧で−１０１ｍｍＨｇ〜−４５０ｍｍＨｇとすることができる。第１吸引圧力がゲージ圧で−１００ｍｍＨｇを超えると、前記先走り現象が抑えきれなくなる。第２吸引圧力がゲージ圧で−４５０ｍｍＨｇを超えると、鋳込んだ溶湯による製品に対する差し込み欠陥が増加する。
For this reason, the control panel 21 operates the pipe switching device 12 based on the storage unit of the time required for the initial pouring and the signal at the end of the initial pouring after inputting the pouring start signal. The vacuum piping system A1 that has sucked the mold 1 with a predetermined first suction pressure close to atmospheric pressure until the end of the initial pouring is switched to the vacuum piping system A2 that sucks with a predetermined second suction pressure close to low vacuum. And a control unit.
In the present invention, the predetermined first suction pressure and the predetermined second suction pressure can be appropriately selected. For example, the predetermined first suction pressure is a gauge pressure of −1 mmHg to −100 mmHg. As the second suction pressure, the gauge pressure can be -101 mmHg to -450 mmHg. When the first suction pressure exceeds −100 mmHg in gauge pressure, the preceding running phenomenon cannot be suppressed. When the second suction pressure exceeds -450 mmHg in gauge pressure, insertion defects in the product due to the cast molten metal increase.
以上説明したとおり、注湯初期では、真空配管系統Ａ１で鋳型１をゲージ圧で、たとえば−７５ｍｍＨｇの吸引圧力により吸引することにより、溶湯の先走り現象を抑えることができるため、湯道６、堰７、押し湯部８の周辺表面に薄い金属皮膜が形成されない。このため、これらの周辺表面の通気性を確保することができる。
この注湯初期を経過すると、湯口系や押し湯部８に順次溶湯が充填され、これ以降は溶湯の先走り現象は起きにくくなり、消失模型４のキャビティに溶湯が満たされていく段階である。
このため、注湯初期の終了時点から、配管切替え装置１２を作動して、真空配管系統Ａ２で鋳型１をゲージ圧で、たとえば−３５０ｍｍＨｇの吸引圧力に切り替えて吸引する。
これにより、消失模型４の燃焼ガスが充分に吸引され、かつ排出されるとともに、溶湯の湯流れ性が改善される。また、鋳込み時の鋳型の強度が確保されて、型くずれや型張りなどが発生しなくなる。
また、前記注湯初期の終了時点から吸引圧力を切り替えた吸引は、注湯終了および注湯終了後も続けられるが、注湯終了後に大気圧に近い吸引圧力に切り替えることができる。これにより、省エネ効果を得ることができる。
また、本実施の形態では、前記溶湯の先走り現象に起因するガス欠陥、酸化物欠陥、湯境い欠陥、湯じわ欠陥が発生しないことにより注湯温度の低温度化を可能とするとともに、この注湯温度の低下により注湯作業環境改善効果（注湯温度が下げられれば注湯作業者の高温作業が楽になる）を得ることができる。
As described above, at the initial stage of pouring, the first run of the molten metal can be suppressed by sucking the mold 1 with the vacuum pressure of the vacuum piping system A1 with a suction pressure of, for example, -75 mmHg. 7. A thin metal film is not formed on the peripheral surface of the feeder 8. For this reason, the air permeability of these peripheral surfaces can be ensured.
After the initial stage of pouring, the molten metal is sequentially filled in the sprue system and the feeder 8, and thereafter, it is difficult for the molten metal to advance, and the cavity of the disappearance model 4 is filled with the molten metal.
For this reason, the pipe switching device 12 is operated from the end of the initial stage of pouring, and the mold 1 is suctioned by switching to the suction pressure of −350 mmHg, for example, with the gauge pressure in the vacuum piping system A2.
Thereby, the combustion gas of the disappearance model 4 is sufficiently sucked and discharged, and the molten metal flow property is improved. In addition, the strength of the mold at the time of casting is ensured, so that mold deformation and mold tension do not occur.
Further, the suction with the suction pressure switched from the end of the initial pouring is continued after the pouring and after the pouring, but can be switched to a suction pressure close to the atmospheric pressure after the pouring is finished. Thereby, the energy-saving effect can be acquired.
Further, in the present embodiment, it is possible to lower the pouring temperature by not causing gas defects, oxide defects, hot water boundary defects, and hot water wrinkle defects due to the preceding phenomenon of the molten metal, Due to this decrease in pouring temperature, the pouring work environment can be improved (if the pouring temperature is lowered, the hot work of the pouring worker can be facilitated).
なお、本実施の形態では、上下２段に配設した消失模型を鋳物砂に埋設した鋳型について説明しているが、本発明においては、これに限定されるものではなく、１段に配設した消失模型や３段以上に配設した消失模型を鋳物砂に埋設した鋳型にも適用することができる。
また、本実施の形態では、あらかじめ実験により算出した注湯初期の終了時点を制御盤に記憶させて注湯工程を行っているが、本発明においては、これに限定されるものではなく、注湯作業毎に鋳型に注湯初期の終了時点を検知する検知手段を取り付けて注湯工程を行うこともできる。
また、本実施の形態では、配管切替え装置１２を設けこれに制御盤２１を連結するとともに吸引配管経路Ａを途中で２系統に分岐しているが、本発明においては、これに限定されるものではなく、配管切替え装置１２を省くとともに吸引配管経路Ａを分岐させずに吸引圧力を切り替える構成とすることもできる。たとえば図５に示されるように、制御盤４１を吸引機構４２における真空ポンプ４２ａの圧力調整器４２ｂに接続させて吸引圧力を切り替えるようにすることができる。なお、符号４２ｃはレシーバータンクである。
さらに、本実施の形態では、前記配管切替え装置１２から吸引機構１１までの吸引配管経路Ａを２系統に分岐しているが、３系統など所定の個数に分岐させて吸引圧力を段階的に吸引させることもできる。
In the present embodiment, the casting model in which the disappearance models arranged in the upper and lower two stages are embedded in the foundry sand is described. However, the present invention is not limited to this and is arranged in one stage. The disappeared model and the disappeared model arranged in three or more stages can also be applied to a mold embedded in foundry sand.
Further, in the present embodiment, the pouring process is performed by storing in the control panel the end point of the pouring initial stage calculated in advance by experiments, but the present invention is not limited to this. It is also possible to perform the pouring process by attaching detection means for detecting the end point of the initial pouring to the mold for every hot water operation.
Further, in the present embodiment, the pipe switching device 12 is provided, and the control panel 21 is connected thereto, and the suction pipe path A is branched into two systems along the way. However, the present invention is limited to this. Instead, it is possible to omit the pipe switching device 12 and switch the suction pressure without branching the suction pipe path A. For example, as shown in FIG. 5, the suction pressure can be switched by connecting the control panel 41 to the pressure regulator 42 b of the vacuum pump 42 a in the suction mechanism 42. Reference numeral 42c denotes a receiver tank.
Further, in this embodiment, the suction piping path A from the pipe switching device 12 to the suction mechanism 11 is branched into two systems, but the suction pressure is suctioned stepwise by branching into a predetermined number such as three systems. It can also be made.
Ａ 吸引配管経路
Ａ１、Ａ２ 真空配管系統
Ｐ 主吸引配管
Ｐ１ 第１分岐吸引配管
Ｐ２ 第２分岐吸引配管
１ 鋳型
２ チャンバー
２ａ フィルタ付吸引管
３ 鋳枠
４ 消失模型
５ 湯口
６ 湯道
７ 堰
８ 押し湯部
９ 鋳型砂
１１、４２ 吸引機構
１１ａ、４２ａ 真空ポンプ
１１ｂ、４２ｂ 圧力調整器
１１ｃ、４２ｃ レシーバータンク
１２ 配管切替え装置
２１、４１ 制御盤
３１ 導電線
３２ 電池
３３ 電球
３４ タッチセンサ
A Suction piping path A1, A2 Vacuum piping system P Main suction piping P1 1st branch suction piping P2 2nd branch suction piping 1 Mold 2 Chamber 2a Suction tube with filter 3 Cast frame 4 Disappearance model 5 Tap 6 Runway 7 Weir 8 Push Hot water 9 Mold sand 11, 42 Suction mechanism 11a, 42a Vacuum pump 11b, 42b Pressure regulator 11c, 42c Receiver tank 12 Pipe switching device 21, 41 Control panel 31 Conductive wire 32 Battery 33 Light bulb 34 Touch sensor
Claims (4)
前記注湯工程における注湯初期の終了まで、大気圧に近い所定の第１吸引圧力で前記鋳型内を吸引する工程と、
前記注湯初期の終了時点から、前記所定の第１吸引圧力より低い所定の第２吸引圧力に切り替えて前記鋳型内を吸引する工程
とを含む鋳型の減圧方法。 A mold depressurization method in which a pouring process is performed while sucking inside the mold,
Sucking the inside of the mold with a predetermined first suction pressure close to atmospheric pressure until the end of the pouring initial stage in the pouring step;
A mold depressurization method including a step of switching to a predetermined second suction pressure lower than the predetermined first suction pressure from the end of the initial pouring to suck the inside of the mold.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4932167B1 (en) * | 1969-10-01 | 1974-08-28 |
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| JPS51105918A (en) * | 1975-02-26 | 1976-09-20 | Kawasaki Heavy Ind Ltd | GENATSU FURUMOORUDOCHUZOHO |
| JPS61286053A (en) * | 1985-06-11 | 1986-12-16 | Toyota Motor Corp | Detection of molten metal leakage |
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