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JP5527451B1 - Casting equipment - Google Patents

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Publication number
JP5527451B1
JP5527451B1 JP2013057572A JP2013057572A JP5527451B1 JP 5527451 B1 JP5527451 B1 JP 5527451B1 JP 2013057572 A JP2013057572 A JP 2013057572A JP 2013057572 A JP2013057572 A JP 2013057572A JP 5527451 B1 JP5527451 B1 JP 5527451B1
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Prior art keywords
cavity
molten metal
opening
pressurizing
pressurizing chamber
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JP2014180696A (en
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寛人 佐々木
博晃 三吉
晴生 明本
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Ube Machinery Corp Ltd
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Ube Machinery Corp Ltd
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Application filed by Ube Machinery Corp Ltd filed Critical Ube Machinery Corp Ltd
Priority to JP2013057572A priority Critical patent/JP5527451B1/en
Priority to EP13878814.6A priority patent/EP2977127A4/en
Priority to CN201380074842.5A priority patent/CN105073302B/en
Priority to US14/779,002 priority patent/US20160045955A1/en
Priority to PCT/JP2013/082182 priority patent/WO2014147892A1/en
Priority to KR1020157030092A priority patent/KR20150131384A/en
Publication of JP5527451B1 publication Critical patent/JP5527451B1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/067—Venting means for moulds
    • 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
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • 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
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B22D17/145—Venting means therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

【課題】溶湯の飛沫を防止して、製品の品質向上を図る
【解決手段】鋳造装置は、下方に開口を有するキャビティを形成する金型と、金型の下方に配置されて溶湯を収容すると共に溶湯の上部に密閉空間を形成する加圧室と、上端開口がキャビティの開口に連通し下端開口が加圧室内の溶湯の内部に浸漬された筒状のストークと、加圧室の密閉空間にガスを供給して加圧室内を加圧する加圧手段と、キャビティからガスを排出してキャビティ内を減圧する減圧手段と、制御装置とを有する。制御装置は、加圧室からキャビティに溶湯を充填する際、溶湯がキャビティの開口に達するまで加圧手段によって加圧室内を加圧し、溶湯がキャビティの開口に達した後に加圧室内の加圧を続行しつつ、減圧手段によってキャビティ内を減圧する。
【選択図】図１An object of the present invention is to improve the quality of a product by preventing splash of molten metal. A casting apparatus includes a mold that forms a cavity having an opening below and a molten metal that is disposed below the mold. A pressure chamber that forms a sealed space in the upper part of the molten metal, a cylindrical stalk in which the upper end opening communicates with the opening of the cavity and the lower end opening is immersed in the molten metal in the pressurized chamber, and the sealed space of the pressurized chamber There are pressurizing means for supplying gas to the pressurizing chamber, decompressing means for discharging the gas from the cavity and decompressing the cavity, and a control device. When filling the melt from the pressurizing chamber to the cavity, the control device pressurizes the pressurizing chamber until the molten metal reaches the opening of the cavity, and pressurizes the pressurizing chamber after the molten metal reaches the opening of the cavity. , The inside of the cavity is decompressed by the decompression means.
[Selection] Figure 1

Description

本発明は鋳造装置に関する。   The present invention relates to a casting apparatus.

従来から、アルミホイール等のアルミニウム複合製品を低圧鋳造又は低中圧鋳造により製造する鋳造装置が知られている。この種の鋳造装置では、加圧室（るつぼ）内に溶湯を収容した状態で加圧室内の圧力を高めると共に、金型のキャビティ内の圧力を真空引きする。この加圧と真空引きの圧力差によって溶湯を加圧室からストークを介してキャビティに充填する（特許文献１）。   2. Description of the Related Art Conventionally, a casting apparatus for manufacturing an aluminum composite product such as an aluminum wheel by low pressure casting or low / medium pressure casting is known. In this type of casting apparatus, the pressure in the pressurizing chamber is increased while the molten metal is contained in the pressurizing chamber (crucible), and the pressure in the cavity of the mold is evacuated. The melt is filled into the cavity from the pressurizing chamber through the stalk by the pressure difference between the pressurization and the vacuuming (Patent Document 1).

しかしながら、特許文献１に開示された鋳造装置では、溶湯側を正圧、キャビティ側を負圧とした上でゲートピストンピンを開放するため、開放の瞬間に圧力差によって溶湯が飛沫し、成形品に湯皺及び湯境が生じる。すなわち、成形品の品質低下を招くという問題がある。   However, in the casting apparatus disclosed in Patent Document 1, since the gate piston pin is opened after the molten metal side is set to a positive pressure and the cavity side is set to a negative pressure, the molten metal splashes due to the pressure difference at the moment of opening. A hot water bath and a hot water boundary are generated. That is, there is a problem that the quality of the molded product is deteriorated.

特開平５−１４６８６４JP-A-5-146864

本発明は、上記事情に鑑みてなされたもので、溶湯の飛沫を防止して鋳造製品の品質を向上させることができる鋳造装置及を提供することを目的とする。   This invention is made | formed in view of the said situation, and it aims at providing the casting apparatus which can prevent the splash of a molten metal, and can improve the quality of a cast product.

本発明に係る鋳造装置は、金型、加圧室、ストーク、加圧手段、減圧手段、及び制御装置を有する。金型は、下方に開口を有するキャビティを形成する。加圧室は、前記金型の下方に配置されて溶湯を収容すると共に溶湯の上部に密閉空間を形成する。ストークは、上端開口がキャビティの開口に連通し下端開口が加圧室内の溶湯の内部に浸漬された筒状に形成される。加圧手段は、加圧室の密閉空間にガスを供給して加圧室内を加圧する。減圧手段は、キャビティからガスを排出して、キャビティ内を減圧する。制御装置は、加圧室からキャビティに溶湯を充填する際、溶湯がキャビティの開口に達するまで加圧手段によって加圧室内を加圧し、溶湯がキャビティの開口に達した後に加圧室内の加圧を続行しつつ、減圧手段によってキャビティ内を減圧する。   The casting apparatus according to the present invention includes a mold, a pressurizing chamber, stalk, a pressurizing unit, a depressurizing unit, and a control unit. The mold forms a cavity having an opening below. The pressurizing chamber is disposed below the mold and accommodates the molten metal, and forms a sealed space above the molten metal. The stalk is formed in a cylindrical shape in which the upper end opening communicates with the cavity opening and the lower end opening is immersed in the molten metal in the pressurizing chamber. The pressurizing means supplies gas to the sealed space of the pressurizing chamber to pressurize the pressurizing chamber. The decompression means exhausts gas from the cavity and decompresses the inside of the cavity. When filling the melt from the pressurizing chamber to the cavity, the control device pressurizes the pressurizing chamber until the molten metal reaches the opening of the cavity, and pressurizes the pressurizing chamber after the molten metal reaches the opening of the cavity. , The inside of the cavity is decompressed by the decompression means.

本発明によれば、加圧室からキャビティに溶湯を充填する際、溶湯がキャビティの開口に達するまで加圧手段によって加圧室内を加圧し、溶湯がキャビティの開口に達した後に加圧室内の加圧を続行しつつ、減圧手段によってキャビティ内を減圧する。このような加圧と減圧のタイミングによって、本発明では溶湯の飛沫を防止して製品の品質向上を図ることができる。   According to the present invention, when filling the cavity from the pressurizing chamber, the pressurizing chamber is pressurized by the pressurizing means until the molten metal reaches the opening of the cavity, and after the molten metal reaches the opening of the cavity, While continuing the pressurization, the inside of the cavity is decompressed by the decompression means. According to the timing of such pressurization and decompression, the present invention can prevent the molten metal from splashing and improve the quality of the product.

実施の形態に係る鋳造装置を示す概略図である。It is the schematic which shows the casting apparatus which concerns on embodiment. 実施の形態に係るキャビティ２２を示す平面図である。It is a top view which shows the cavity 22 which concerns on embodiment. 実施の形態に係る充填動作の概略図である。It is the schematic of the filling operation | movement which concerns on embodiment. 実施の形態に係る充填動作の概略図である。It is the schematic of the filling operation | movement which concerns on embodiment. 実施の形態に係る充填動作の概略図である。It is the schematic of the filling operation | movement which concerns on embodiment. 実施の形態に係る充填動作の概略図である。It is the schematic of the filling operation | movement which concerns on embodiment. 実施の形態における経過時間に伴う加圧源１６から加圧室１０に加わる圧力Ｐ１、真空装置３２からキャビティ２２を吸引する圧力Ｐ２及びこれら圧力Ｐ１，Ｐ２の差圧Ｐ３（以下、充填差圧）の変化を示す図である。In the embodiment, the pressure P1 applied to the pressurizing chamber 10 from the pressurizing source 16 with the passage of time, the pressure P2 sucking the cavity 22 from the vacuum device 32, and the differential pressure P3 between these pressures P1, P2 (hereinafter referred to as filling differential pressure) It is a figure which shows the change of. 比較例における経過時間に伴う加圧源１６から加圧室１０に加わる圧力Ｐ１、真空装置３２からキャビティ２２を吸引する圧力Ｐ２及び充填差圧Ｐ３の変化を示す図である。It is a figure which shows the change of the pressure P1 applied to the pressurization chamber 10 from the pressurization source 16 in the comparative example, the pressure P2 which attracts | sucks the cavity 22 from the vacuum apparatus 32, and the filling differential pressure P3.

以下、添付の図面を参照して実施の形態に係る鋳造装置を詳細に説明する。   Hereinafter, a casting apparatus according to an embodiment will be described in detail with reference to the accompanying drawings.

図１は、実施の形態に係る鋳造装置を示す概略図である。鋳造装置は、図１に示すように、溶湯Ａを加圧する加圧室（るつぼ）１０を有する。加圧室１０内には、溶湯Ａを保持する容器１１が設けられている。加圧室１０の上端開口部は、固定板１２によって閉塞され、加圧室１０内は密閉空間とされている。この密閉空間（加圧室１０）にガス供給路１３、及びガス排出路１４が連通している。ガス供給路１３は、バルブ１５を介して加圧源１６に接続されて不活性ガスを加圧室１０内に供給する。ガス排出路１４は、バルブ１７を介して加圧室１０を大気開放する。   FIG. 1 is a schematic view showing a casting apparatus according to the embodiment. As shown in FIG. 1, the casting apparatus has a pressurizing chamber (crucible) 10 for pressurizing the molten metal A. A container 11 for holding the molten metal A is provided in the pressurizing chamber 10. The upper end opening of the pressurizing chamber 10 is closed by the fixing plate 12, and the inside of the pressurizing chamber 10 is a sealed space. A gas supply path 13 and a gas discharge path 14 communicate with the sealed space (pressurizing chamber 10). The gas supply path 13 is connected to a pressurization source 16 through a valve 15 and supplies an inert gas into the pressurization chamber 10. The gas discharge path 14 opens the pressurizing chamber 10 to the atmosphere via the valve 17.

固定板１２の中央には、両端が開口した筒状のストーク１８の上端が固定されている。ストーク１８の下端は、加圧室１０内の溶湯Ａに浸っている。固定板１２の上面には、固定金型１９が装着されている。また、固定金型１９に対して上方に移動可能に構成された可動板２０の下面には、可動金型２１が装着されている。固定金型１９と可動金型２１とは、型閉したときにキャビティ２２を形成する。固定金型１９の中央部には、キャビティ２２に連通するゲート部分に開口２３ａが形成され、この開口２３ａにストーク１８の上端部が連通している。また、固定金型１９には、キャビティ２２からガスを抜くためのガス抜き用通路２３ｂが接続され、キャビティ２２とガス抜き通路２３ｂとの間に溶湯Ａのガス抜き用通路２３ｂへの侵入を防止するチルベント２３ｃが設けられている。   At the center of the fixed plate 12, the upper end of a cylindrical stalk 18 having both ends opened is fixed. The lower end of the stalk 18 is immersed in the molten metal A in the pressurizing chamber 10. A fixed mold 19 is attached to the upper surface of the fixed plate 12. A movable mold 21 is mounted on the lower surface of the movable plate 20 configured to be movable upward with respect to the fixed mold 19. The fixed mold 19 and the movable mold 21 form a cavity 22 when the mold is closed. An opening 23 a is formed in a gate portion communicating with the cavity 22 at the center of the fixed mold 19, and an upper end portion of the stalk 18 is communicated with the opening 23 a. Further, a degassing passage 23b for extracting gas from the cavity 22 is connected to the fixed mold 19, and the molten metal A is prevented from entering the degassing passage 23b between the cavity 22 and the degassing passage 23b. A chill vent 23c is provided.

可動金型２１には、ゲートシールピン２４、センター加圧ピン２５、及び部分加圧ピン２６が装着されている。ゲートシールピン２４は、開口２３ａに対して進退自在に構成されて開口２３ａを開閉する。ゲートシールピン２４は略棒状に形成されている。センター加圧ピン２５は、キャビティ２２に連通する湯だまり２７対して進退自在に構成されてキャビティ２２内を加圧する。センター加圧ピン２５は、ゲートシールピン２４を取り囲む筒状に形成されている。部分加圧ピン２６は、キャビティ２２に連通する湯だまり２８対して進退自在に構成されてキャビティ２２内を加圧する。部分加圧ピン２６は、略棒状に形成されている。   A gate seal pin 24, a center pressure pin 25, and a partial pressure pin 26 are attached to the movable mold 21. The gate seal pin 24 is configured to move forward and backward with respect to the opening 23a, and opens and closes the opening 23a. The gate seal pin 24 is formed in a substantially rod shape. The center pressurizing pin 25 is configured to be movable forward and backward with respect to the hot water puddle 27 communicating with the cavity 22 and pressurizes the cavity 22. The center pressurizing pin 25 is formed in a cylindrical shape surrounding the gate seal pin 24. The partial pressure pin 26 is configured to move forward and backward with respect to the hot water reservoir 28 communicating with the cavity 22 and pressurizes the cavity 22. The partial pressure pin 26 is formed in a substantially rod shape.

ゲートシールピン２４、及びセンター加圧ピン２５は、上端部が駆動手段としてのピストン機構２９に連結されて、各々上下動可能に構成されている。同様に、部分加圧ピン２６は、上端部が駆動手段としてのピストン機構３０に連結されて、各々上下動可能に構成されている。   The gate seal pin 24 and the center pressurizing pin 25 are configured such that their upper end portions are connected to a piston mechanism 29 as a driving means and can be moved up and down. Similarly, the partial pressurizing pins 26 are configured such that their upper ends are connected to a piston mechanism 30 as drive means, and can be moved up and down.

また、鋳造装置は、図１に示すように、ガス抜き用通路２３ｂにガス抜き用弁３１を介して接続された真空装置３２、及びコントローラ３３を有する。   Further, as shown in FIG. 1, the casting apparatus includes a vacuum device 32 and a controller 33 connected to the gas vent passage 23 b via a gas vent valve 31.

真空装置３２は、ガス抜き用弁３１及びガス抜き用通路２３ｂを介してキャビティ２２からガスを排出し、キャビティ２２内を減圧する。真空装置３２は、真空タンク３２１、真空タンク３２１を真空引きする真空ポンプ３２２、及び真空ポンプ３２２を駆動するモータ３２３を有する。   The vacuum device 32 discharges gas from the cavity 22 via the gas vent valve 31 and the gas vent passage 23b, and decompresses the inside of the cavity 22. The vacuum device 32 includes a vacuum tank 321, a vacuum pump 322 that evacuates the vacuum tank 321, and a motor 323 that drives the vacuum pump 322.

コントローラ３３は、バルブ１５及び加圧源１６を制御して加圧室１０内を加圧する。コントローラ３３は、バルブ１７を制御して加圧室１０を大気開放する。コントローラ３３は、バルブ３１及び真空装置３２を制御してキャビティ２２内のガスを排出し、キャビティ２２内を減圧する。コントローラ３３は、ピストン機構２９を制御してゲートシールピン２４により開口２３ａを開閉する。コントローラ３３は、ピストン機構２９，３０を制御してセンター加圧ピン２５及び部分加圧ピン２６によりキャビティ２２内を加圧する。   The controller 33 pressurizes the inside of the pressurizing chamber 10 by controlling the valve 15 and the pressurizing source 16. The controller 33 controls the valve 17 to open the pressurizing chamber 10 to the atmosphere. The controller 33 controls the valve 31 and the vacuum device 32 to discharge the gas in the cavity 22 and depressurize the inside of the cavity 22. The controller 33 controls the piston mechanism 29 to open and close the opening 23 a by the gate seal pin 24. The controller 33 controls the piston mechanisms 29 and 30 to pressurize the cavity 22 by the center pressurizing pin 25 and the partial pressurizing pin 26.

次に、図２を参照して、キャビティ２２に対するゲートシールピン２４、センター加圧ピン２５及び部分加圧ピン２６の位置を説明する。図２はキャビティ２２を示す平面図である。図２に示すように、キャビティ２２は、ゲートシールピン２４及びセンター加圧ピン２５を中心にＸ方向及びＹ方向に対称に広がる。図２に示す例では、部分加圧ピン２６は、キャビティ２２の端部近傍に６つ設けられている。   Next, the positions of the gate seal pin 24, the center pressure pin 25, and the partial pressure pin 26 with respect to the cavity 22 will be described with reference to FIG. FIG. 2 is a plan view showing the cavity 22. As shown in FIG. 2, the cavity 22 extends symmetrically in the X direction and the Y direction around the gate seal pin 24 and the center pressurizing pin 25. In the example shown in FIG. 2, six partial pressure pins 26 are provided near the end of the cavity 22.

次に、図３Ａ〜図３Ｄおよび図４を参照して、加圧室１０からキャビティ２２に溶湯Ａを充填する充填動作を説明する。図３Ａ〜図３Ｄは充填動作の概略図である。図４は、経過時間に伴う加圧源１６からキャビティ２２に加わる圧力Ｐ１、真空装置３２からキャビティ２２を吸引する圧力Ｐ２、及びこれら圧力Ｐ１，Ｐ２の差圧Ｐ３（以下、充填差圧）の変化を示す図である。なお、本実施の形態において、充填動作は経過時間に基づき実行される。例えば、溶湯Ａの湯面が開口２３ａに達する時間を予め測定しておき、その測定された時間に基づき充填動作は実行される。   Next, with reference to FIG. 3A-FIG. 3D and FIG. 4, the filling operation | movement which fills the molten metal A from the pressurization chamber 10 to the cavity 22 is demonstrated. 3A to 3D are schematic views of the filling operation. FIG. 4 shows the pressure P1 applied to the cavity 22 from the pressurizing source 16 over time, the pressure P2 sucking the cavity 22 from the vacuum device 32, and the differential pressure P3 (hereinafter referred to as filling differential pressure) of these pressures P1 and P2. It is a figure which shows a change. In the present embodiment, the filling operation is executed based on the elapsed time. For example, the time for the molten metal A to reach the opening 23a is measured in advance, and the filling operation is executed based on the measured time.

充填動作において、先ず、図３Ａに示すように、時刻ｔ１１にてコントローラ３３はバルブ１５を開放させる。そして、コントローラ３３は、ガス供給路１３を介して加圧源１６から加圧室１０の密閉空間に不活性ガスを供給する。これにより、図４に示すように、時刻ｔ１１以降、加圧源１６から加圧室１０に加わる圧力Ｐ１は上昇する。したがって、図４に示すように充填差圧Ｐ３は上昇し、溶湯Ａの湯面は上昇する。   In the filling operation, first, as shown in FIG. 3A, the controller 33 opens the valve 15 at time t11. Then, the controller 33 supplies an inert gas from the pressurization source 16 to the sealed space of the pressurization chamber 10 via the gas supply path 13. Thereby, as shown in FIG. 4, the pressure P1 applied to the pressurization chamber 10 from the pressurization source 16 rises after the time t11. Therefore, as shown in FIG. 4, the filling differential pressure P3 rises, and the molten metal A rises.

次に、図３Ｂに示すように、時刻ｔ１２にて溶湯Ａがキャビティ２２の開口２３ａに達した後も、コントローラ３３は継続してガス供給路１３を介して加圧源１６から加圧室１０の密閉空間に不活性ガスを供給する。また、図３Ｂに示すように、コントローラ３３はバルブ３１を開放してキャビティ２２と真空タンク３２１とを連通させる。これにより、キャビティ２２内のガスはガス抜き用通路２３ｂを介して真空タンク３２１に排出される。なお、溶湯Ａがキャビティ２２の開口２３ａに達したことは、センサで検知しても良いし、所定圧力で湯面が開口２３ａに到達する時間を予め計測しておき、その時間で管理するようにしても良い。   Next, as shown in FIG. 3B, after the molten metal A reaches the opening 23 a of the cavity 22 at time t <b> 12, the controller 33 continues from the pressurizing source 16 through the gas supply path 13 to the pressurizing chamber 10. An inert gas is supplied to the enclosed space. Further, as shown in FIG. 3B, the controller 33 opens the valve 31 so that the cavity 22 and the vacuum tank 321 communicate with each other. Thereby, the gas in the cavity 22 is discharged to the vacuum tank 321 through the gas vent passage 23b. The fact that the molten metal A has reached the opening 23a of the cavity 22 may be detected by a sensor, or the time for the molten metal surface to reach the opening 23a at a predetermined pressure is measured in advance and managed by that time. Anyway.

上記図３Ｂに示す制御により、図４に示すように、時刻ｔ１２以降も加圧源１６からキャビティ２２に加わる圧力Ｐ１は上昇し続ける。ただし、キャビティ２２の形状により、圧力Ｐ１の上昇スピードは一定でない。また、上記図３Ｂに示す制御により、キャビティ２２から真空装置３２による排出により金型内の減圧（真空）度が増大する。すなわち、図４に示すようにキャビティ２２に加わる圧力Ｐ２はマイナス方向に低下する。これら圧力Ｐ１，Ｐ２によって、図４に示すように充填差圧Ｐ３は上昇する。   By the control shown in FIG. 3B, as shown in FIG. 4, the pressure P1 applied to the cavity 22 from the pressurization source 16 continues to increase after time t12. However, due to the shape of the cavity 22, the increasing speed of the pressure P1 is not constant. Further, by the control shown in FIG. 3B, the degree of pressure reduction (vacuum) in the mold is increased by the discharge from the cavity 22 by the vacuum device 32. That is, as shown in FIG. 4, the pressure P2 applied to the cavity 22 decreases in the minus direction. By these pressures P1 and P2, the filling differential pressure P3 increases as shown in FIG.

次に、図３Ｃに示すように、時刻ｔ１３にてキャビティ２２内に溶湯Ａが充填されると、キャビティ２２の周辺に配置したチルベント２３ｃに溶湯Ａが突入凝固し、充填工程が完了する。全てのチルベント２３ｃで溶湯Ａが凝固したら、コントローラ３３はバルブ３１を閉じて減圧を停止する。しかし、加圧源１６からの圧力は一定圧力に維持され、キャビティ２２内の溶湯Ａは、この圧力下で凝固する。なお、その際、ゲートシールピン２４を押し下げて開口２３ａを塞ぐ。続いて、図３Ｄに示すように、コントローラ３３はバルブ１７を開放させて加圧室１０を大気開放させ、ストーク１８内の溶湯Ａの湯面を下げる。このとき、コントローラ３３は、図３Ｄに示すように、センター加圧ピン２５を押し下げて、キャビティ２２内を加圧し、この圧力を更に上げるようにしても良い。更に、部分加圧ピン２６による加圧を併用するようにしても良い。また、ゲートシールピン２４とセンター加圧ピン２５は、一体構造でも良く、この場合、単一のシリンダで下降させ、ゲート閉塞と加圧とを連続動作で行うことになる。キャビティ２２内の溶湯Ａが凝固した後、可動金型２１を上昇させて製品を取り出す。   Next, as shown in FIG. 3C, when the molten metal A is filled into the cavity 22 at time t13, the molten metal A rushes and solidifies into the chill vent 23c arranged around the cavity 22, and the filling process is completed. When the molten metal A has solidified in all the chill vents 23c, the controller 33 closes the valve 31 and stops the pressure reduction. However, the pressure from the pressurizing source 16 is maintained at a constant pressure, and the molten metal A in the cavity 22 is solidified under this pressure. At that time, the gate seal pin 24 is pushed down to close the opening 23a. Subsequently, as shown in FIG. 3D, the controller 33 opens the valve 17 to release the pressurizing chamber 10 to the atmosphere, and lowers the molten metal surface of the molten metal A in the stalk 18. At this time, as shown in FIG. 3D, the controller 33 may press down the center pressurizing pin 25 to pressurize the inside of the cavity 22 and further increase the pressure. Furthermore, you may make it use the pressurization by the partial pressurization pin 26 together. Further, the gate seal pin 24 and the center pressurizing pin 25 may have an integral structure. In this case, the gate seal pin 24 and the center pressurizing pin 25 are lowered by a single cylinder, and the gate closing and pressurizing are performed in a continuous operation. After the molten metal A in the cavity 22 is solidified, the movable mold 21 is raised and the product is taken out.

ここで、減圧されたキャビティ２２をゲートシールピン２４で封鎖し、加圧室１０内を加圧し、溶湯Ａをゲートシールピン２４直下まで上昇させ、ゲートシールピン２４を開放し加圧と減圧との圧力差で溶湯Ａをキャビティ２２内に流入させる方法では、溶湯Ａがキャビティ２２内に飛沫となって侵入し、成形品に湯皺、湯境が生じる。これに対して、本実施の形態は、ゲートシールピン２４が開放されている状態で、上述したように溶湯Ａがキャビティ２２の開口２３ａに達するまで加圧室１０内を加圧し、溶湯Ａがキャビティ２２の開口２３ａに達した後に加圧室１０内の加圧は続行することに加えて、図４に示すように、キャビティ２２内を徐々に減圧する。これにより金型への溶湯流入時の充填差圧Ｐ３を緩やかに上昇させることができる。したがって、本実施の形態は、溶湯Ａの飛沫を抑制し、成形品の湯皺及び湯境の発生を抑制できる。   Here, the decompressed cavity 22 is sealed with the gate seal pin 24, the inside of the pressurizing chamber 10 is pressurized, the molten metal A is raised to a position directly below the gate seal pin 24, the gate seal pin 24 is opened, and the pressurization and depressurization are performed. In the method in which the molten metal A flows into the cavity 22 due to the pressure difference, the molten metal A enters the cavity 22 in the form of droplets, and a molten metal and a hot water boundary are generated in the molded product. On the other hand, in the present embodiment, in the state where the gate seal pin 24 is opened, the inside of the pressurizing chamber 10 is pressurized until the molten metal A reaches the opening 23a of the cavity 22 as described above. In addition to continuing the pressurization in the pressurizing chamber 10 after reaching the opening 23a of the cavity 22, the interior of the cavity 22 is gradually decompressed as shown in FIG. Thereby, the filling differential pressure P3 when the molten metal flows into the mold can be gradually increased. Therefore, this Embodiment can suppress the splash of the molten metal A, and can suppress generation | occurrence | production of the hot water bottle and hot water boundary of a molded article.

また、本実施の形態においては、真空装置３２と加圧室１０でキャビティ２２内の圧力を制御する。したがって、複数の加圧室を設けてキャビティ２２内の圧力を制御する場合と比較して、本実施の形態は簡素な構造とできる。また、加圧室１０のみでキャビティ２２内の圧力を制御する場合と比較して、本実施の形態は加圧室１０にかかる負荷を抑制でき、加圧室１０の気密性を保つことができる。参考のために、図５に、真空装置３２を併用しない比較例における、経過時間に伴う加圧源１６からキャビティ２２に加わる圧力Ｐ１、キャビティ２２の圧力Ｐ２、及びこれら圧力Ｐ１，Ｐ２の差圧Ｐ３の変化を示す。キャビティ２２の減圧が無い場合、キャビティ２２に溶湯Ａが流入し充填が進むにつれ、残部には背圧が立ち、その背圧は充填終盤にかけて圧縮されて更に大きくなり、最終充填部への溶湯の充填を阻害する。したがって、加圧室の加圧のみでこれを解消しようとすれば、図５に示すように、必然的に加圧力Ｐ１を大きくする必要がある。しかし、７００℃の高温の系を抱えた密閉容器にて圧力を増すことは、それだけ気密シール部を強化し熱的な負荷を軽減する施策が必要となる。すなわち、シール材自体が耐熱性を有するものであることに加えて、フランジ等のシール部材の熱膨張や熱歪みを抑制する対策、例えばシール部付近に冷却回路を設けることなどが必要となる。また、使用する材料も高価になることに加えて設備が複雑になる。このような問題を本実施の形態では解決することができる。   In the present embodiment, the pressure in the cavity 22 is controlled by the vacuum device 32 and the pressurizing chamber 10. Therefore, compared with the case where a plurality of pressurizing chambers are provided and the pressure in the cavity 22 is controlled, this embodiment can have a simple structure. Further, as compared with the case where the pressure in the cavity 22 is controlled only by the pressurizing chamber 10, the present embodiment can suppress the load applied to the pressurizing chamber 10 and can maintain the airtightness of the pressurizing chamber 10. . For reference, FIG. 5 shows a pressure P1 applied to the cavity 22 from the pressurization source 16 with the passage of time, a pressure P2 of the cavity 22, and a differential pressure between these pressures P1 and P2 in a comparative example in which the vacuum device 32 is not used together. The change of P3 is shown. When the cavity 22 is not depressurized, as the molten metal A flows into the cavity 22 and the filling proceeds, the back pressure is generated in the remaining portion, and the back pressure is further compressed by the end of the filling, and the molten metal to the final filling portion is increased. Inhibits filling. Therefore, if this is to be solved only by pressurization of the pressurizing chamber, it is necessary to increase the applied pressure P1 as shown in FIG. However, increasing the pressure in a closed container having a high temperature system of 700 ° C. requires measures to reinforce the hermetic seal and reduce the thermal load. That is, in addition to the sealing material itself having heat resistance, it is necessary to take measures to suppress thermal expansion and thermal distortion of a sealing member such as a flange, for example, to provide a cooling circuit in the vicinity of the sealing portion. In addition to the expensive materials used, the equipment becomes complicated. Such a problem can be solved in this embodiment.

また、本実施の形態においては、真空装置３２によりキャビティ２２内の背圧を抑えることができるので、キャビティ２２内の溶湯Ａの流動性を高めることができる。   Moreover, in this Embodiment, since the back pressure in the cavity 22 can be suppressed with the vacuum apparatus 32, the fluidity | liquidity of the molten metal A in the cavity 22 can be improved.

以上、発明の実施の形態を説明したが、本発明はこれらに限定されるものではなく、発明の趣旨を逸脱しない範囲内において、種々の変更、追加等が可能である。   Although the embodiments of the invention have been described above, the present invention is not limited to these embodiments, and various modifications and additions can be made without departing from the spirit of the invention.

Ａ…溶湯、 １０…加圧室、 １１…容器、 １２…固定板、 １３…ガス供給路、 １４…ガス排出路、 １５…バルブ、 １６…加圧源、 １７…バルブ、 １８…ストーク、 １９…固定金型、 ２０…可動板、 ２１…可動金型、 ２２…キャビティ、 ２３ａ…開口、 ２３ｂ…ガス抜き用通路、 ２３ｃ…チルベント、 ２４…ゲートシールピン、 ２５…センター加圧ピン、 ２６…部分加圧ピン、 ２７，２８…湯だまり、 ２９，３０…ピストン機構、 ３１…ガス抜き用弁、 ３２…真空装置、 ３３…コントローラ。
A ... Molten metal, 10 ... Pressurizing chamber, 11 ... Container, 12 ... Fixing plate, 13 ... Gas supply passage, 14 ... Gas discharge passage, 15 ... Valve, 16 ... Pressure source, 17 ... Valve, 18 ... Stoke, 19 DESCRIPTION OF SYMBOLS ... Fixed mold, 20 ... Movable plate, 21 ... Movable mold, 22 ... Cavity, 23a ... Opening, 23b ... Gas vent passage, 23c ... Chill vent, 24 ... Gate seal pin, 25 ... Center pressure pin, 26 ... Partial pressurizing pin, 27, 28 ... Hot water puddle, 29, 30 ... Piston mechanism, 31 ... Degassing valve, 32 ... Vacuum device, 33 ... Controller.

Claims (3)

下方に開口を有するキャビティを形成する金型と、
前記金型の下方に配置されて溶湯を収容すると共に溶湯の上部に密閉空間を形成する加圧室と、
上端開口が前記キャビティの開口に連通し下端開口が前記加圧室内の溶湯の内部に浸漬された筒状のストークと、
前記加圧室の密閉空間にガスを供給して前記加圧室内を加圧する加圧手段と、
前記キャビティからガスを排出して、前記キャビティ内を減圧する減圧手段と、
前記加圧室から前記キャビティに溶湯を充填する際、前記溶湯が前記キャビティの開口に達するまで前記加圧手段によって前記加圧室内を加圧し、前記溶湯が前記キャビティの開口に達した後に前記加圧室内の加圧を続行しつつ、前記減圧手段による前記キャビティ内の減圧を開始する制御装置と
を備えたことを特徴とする鋳造装置。 A mold for forming a cavity having an opening below;
A pressurizing chamber that is disposed below the mold and accommodates the molten metal and forms a sealed space above the molten metal;
A cylindrical stalk in which an upper end opening communicates with the opening of the cavity and a lower end opening is immersed in the molten metal in the pressurized chamber;
Pressurizing means for supplying gas to the sealed space of the pressurizing chamber to pressurize the pressurizing chamber;
A pressure reducing means for discharging gas from the cavity and decompressing the inside of the cavity;
When filling the cavity with the melt from the pressurizing chamber, the pressurizing means pressurizes the pressurizing chamber until the melt reaches the opening of the cavity, and after the molten metal reaches the opening of the cavity, the heating is performed. while continuing the pressurization in the chamber, a casting apparatus characterized by comprising a control device for starting the pressure reduction in the cavity that due to the pressure reducing means. 前記開口に対して進退自在に構成されて前記開口を開閉するゲートシールピンを備え、
前記制御装置は、前記キャビティに前記溶湯が充填された後に前記ゲートシールピンにより前記開口を閉塞する
ことを特徴とする請求項１記載の鋳造装置。 A gate seal pin configured to be movable forward and backward with respect to the opening and opening and closing the opening;
The casting apparatus according to claim 1, wherein the controller closes the opening with the gate seal pin after the molten metal is filled in the cavity. 前記キャビティに連通する湯だまり対して進退自在に構成されて前記キャビティ内に充填された溶湯を加圧する加圧ピンを更に備える
ことを特徴とする請求項１又は２記載の鋳造装置。 Casting apparatus according to claim 1 or 2, characterized in that is movably configured tundish against communicating further comprising a pressure pin for pressurizing the molten metal filled in the cavity before crisis Yabiti.
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KR20150131384A (en) 2015-11-24
WO2014147892A1 (en) 2014-09-25
CN105073302B (en) 2017-08-08
CN105073302A (en) 2015-11-18
JP2014180696A (en) 2014-09-29
US20160045955A1 (en) 2016-02-18
EP2977127A4 (en) 2016-04-06

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