JP4706511B2 - Mold making method and apparatus - Google Patents

Mold making method and apparatus Download PDF

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Publication number
JP4706511B2
JP4706511B2 JP2006063022A JP2006063022A JP4706511B2 JP 4706511 B2 JP4706511 B2 JP 4706511B2 JP 2006063022 A JP2006063022 A JP 2006063022A JP 2006063022 A JP2006063022 A JP 2006063022A JP 4706511 B2 JP4706511 B2 JP 4706511B2
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foundry sand
stirring
amount
solvent
sand
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JP2007237234A (en
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雄二 堀
昇一 西
直洋 三浦
祐也 福田
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Mazda Motor Corp
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Mazda Motor Corp
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Priority to JP2006063022A priority Critical patent/JP4706511B2/en
Priority to CN2007100847018A priority patent/CN101032735B/en
Priority to EP07004056A priority patent/EP1832358B8/en
Priority to DE602007013830T priority patent/DE602007013830D1/en
Priority to US11/682,591 priority patent/US20070209772A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/044—Devices having a vertical stirrer shaft in a fixed receptacle
    • B22C5/0445—Devices having a vertical stirrer shaft in a fixed receptacle the material flowing continuously through the device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/12—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose for filling flasks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/123—Gas-hardening

Description

本発明は、ガス硬化性鋳物砂を成形型のキャビティ内に吹き込み充填する鋳型造型方法及びその装置に関する技術分野に属する。   The present invention belongs to a technical field related to a mold making method and apparatus for blowing and filling gas curable foundry sand into a cavity of a mold.

従来より、例えば特許文献１に示されているように、粘結剤（フェノール樹脂及びポリイソシアネート化合物）及び溶剤（トルエン等）を含むガス硬化性鋳物砂をブローヘッド内に収容しておき、そのブローヘッド内への加圧気体の供給により、上記鋳物砂をブローノズルを介して成形型のキャビティ内に吹き込み充填し、その後、上記キャビティ内に硬化ガス（トリエチルアミンガス等）を導入して、該キャビティ内に充填された鋳物砂を硬化させることで、鋳型を造型する方法はよく知られている。   Conventionally, for example, as shown in Patent Document 1, gas curable foundry sand containing a binder (phenolic resin and polyisocyanate compound) and a solvent (such as toluene) is accommodated in a blow head, By supplying pressurized gas into the blow head, the foundry sand is blown and filled into the cavity of the mold through the blow nozzle, and then a hardening gas (triethylamine gas or the like) is introduced into the cavity. A method for forming a mold by hardening the foundry sand filled in the cavity is well known.

また、例えば特許文献２に示されているように、ブローヘッド（ホッパ）内の鋳物砂をエアにより浮遊流動化させるとともに、砂だまカッターに通して砂だまを砕き、その後、加圧エアで鋳物砂をキャビティ内に吹き込み充填するようにすることも知られている。
特開平３−４７６４７号公報 特開２００１−２２５１４８号公報 Further, for example, as shown in Patent Document 2, casting sand in a blow head (hopper) is floated and fluidized by air, and the sand is crushed by passing it through a sand cutter, and then cast by pressurized air. It is also known to blow and fill sand into a cavity.
Japanese Patent Laid-Open No. 3-47647 JP 2001-225148 A

上記のようなガス硬化性鋳物砂は、粘結剤によって砂表面に粘着性が生じるため、ブローヘッド内の鋳物砂の嵩密度が安定しておらず、この結果、鋳物砂のキャビティ内への充填性を常に良好に確保することが困難となる。   Since the gas-curing foundry sand as described above has adhesiveness on the sand surface due to the binder, the bulk density of the foundry sand in the blow head is not stable, and as a result, the molding sand enters the cavity of the foundry sand. It becomes difficult to always ensure good filling properties.

そこで、上記特許文献２のように、鋳物砂をキャビティ内に吹き込み充填する前に、鋳物砂をエアーにより浮遊流動化させとともに、砂だまカッターに通して砂だまを砕くようにすることが考えられる。   Thus, as in Patent Document 2, it is conceivable that the casting sand is floated and fluidized with air before passing the casting sand into the cavity, and the sand is crushed through a sand cutter. .

しかしながら、上記特許文献２の方法をガス硬化性鋳物砂に適用すると、以下のような問題が生じる。すなわち、鋳物砂に対し浮遊流動化させるためにエアーを吹き付けると、砂表面に粘結剤と共に付着している溶剤がエアにより飛ばされ、これにより、砂表面の粘結剤の濃度が高くなって硬化反応が加速し、このため、鋳物砂を成形型のキャビティ内に充填する前に硬化することとなって、鋳型の品質が低下してしまう。また、鋳物砂を砂だまカッターに通した場合も、砂表面の溶剤が減少する可能性が高くなる。   However, when the method of Patent Document 2 is applied to gas curable foundry sand, the following problems occur. That is, when air is blown to float and flow on the foundry sand, the solvent adhering to the sand surface together with the binder is blown away by the air, thereby increasing the concentration of the binder on the sand surface. The curing reaction is accelerated, and therefore, the casting sand is hardened before filling into the mold cavity, resulting in a deterioration in the quality of the mold. In addition, when casting sand is passed through a sand ball cutter, the possibility that the solvent on the sand surface is reduced increases.

本発明は、斯かる点に鑑みてなされたものであり、その目的とするところは、上記のようにガス硬化性鋳物砂を成形型のキャビティ内に吹き込み充填する場合に、その鋳物砂をキャビティ内に充填する前に硬化させることなく、良好で安定した充填性を確保しようとすることにある。   The present invention has been made in view of such a point, and the object of the present invention is to provide a molding sand when the gas-curing foundry sand is blown and filled into the cavity of the mold as described above. The object is to secure a good and stable filling property without hardening before filling the inside.

上記の目的を達成するために、この発明では、ブローヘッド内の鋳物砂のキャビティ内への吹き込み充填前に、その鋳物砂を、撹拌部材によって、該撹拌部材の撹拌抵抗値が所定範囲内になるまで撹拌するとともに、鋳物砂量検出手段により検出された鋳物砂量に基づいて、予め収容部内の鋳物砂量と上記所定範囲との関係を記憶したテーブルより上記所定範囲を設定するようにした。 In order to achieve the above object, according to the present invention, before the casting sand in the blow head is blown and filled into the cavity, the stirring sand is brought into a predetermined range by the stirring member. The predetermined range is set from a table in which the relationship between the amount of foundry sand in the housing and the predetermined range is stored in advance based on the amount of foundry sand detected by the foundry sand amount detecting means . .

具体的には、請求項１の発明では、ガス硬化性鋳物砂を収容する収容部を有するブローヘッドの該収容部内で、該鋳物砂を撹拌する撹拌行程と、上記撹拌工程の後に、上記収容部内に加圧気体を供給することで、該収容部内の鋳物砂を、収容部に連通するように設けたブローノズルを介して成形型のキャビティ内に吹き込み充填する吹き込み充填工程と、上記吹き込み充填工程の後に、上記キャビティ内に硬化ガスを導入して、該キャビティ内に充填された鋳物砂を硬化させる硬化工程とを含む鋳型造型方法を対象とする。 Specifically, in the invention of claim 1 , after the stirring step of stirring the foundry sand in the receiving portion of the blow head having a receiving portion for storing the gas curable foundry sand, and after the stirring step, the storing is performed. by supplying pressurized gas to the portion, the molding sand within the housing portion, and the blowing and packing step of packing blown into the mold cavity through a blow nozzle provided so as to communicate with the accommodating portion, the blowing and packing The present invention is directed to a mold making method including, after the step, a curing step of introducing a curing gas into the cavity and curing the foundry sand filled in the cavity.

そして、上記撹拌工程は、上記収容部内の鋳物砂を、撹拌部材によって、該撹拌部材の撹拌抵抗値が所定範囲内になるまで撹拌する工程であり、予め、上記収容部内の鋳物砂量と上記所定範囲との関係を求めて該関係をテーブルに記憶しておく工程と、上記撹拌工程の実行に際して、鋳物砂量検出手段により上記収容部内の鋳物砂量を検出して、該検出した鋳物砂量に基づいて、上記テーブルより上記所定範囲を設定する工程とを含むものとする。 Then, it said stirring step, the casting sand in the accommodating portion, the stirring member, the stirring resistance of the stirring member is a step of stirring until the predetermined range, advance, casting sand amount and the in the accommodating portion A step of obtaining a relationship with a predetermined range and storing the relationship in a table; and when performing the stirring step, the amount of foundry sand in the housing portion is detected by the foundry sand amount detecting means, and the detected foundry sand And a step of setting the predetermined range from the table based on the amount .

このことにより、鋳物砂のキャビティ内への吹き込み充填前に、収容部内の鋳物砂が撹拌されてほぐされる。ここで、鋳物砂の嵩密度が大きすぎると、鋳物砂がブローノズルに詰まって該ブローノズルから出難くなる一方、鋳物砂をほぐしすぎて嵩密度が小さくなりすぎると、加圧気体がブローノズルから抜けるだけで、このときも鋳物砂がブローノズルから出難くなる。つまり、鋳物砂がブローノズルから効率良く吹き出す最適な嵩密度範囲が存在する。一方、収容部内の鋳物砂を撹拌しなければ、鋳物砂の嵩密度は、通常、最適な嵩密度範囲よりも大きく、吹き込み充填工程の回数が多くなればなるほど、加圧気体の加圧によって鋳物砂の嵩密度はますます大きくなる。そこで、吹き込み充填工程の前に、収容部内の鋳物砂を撹拌部材によって撹拌して鋳物砂の嵩密度を上記の最適な嵩密度範囲になるようにする。すなわち、撹拌部材の撹拌抵抗値は鋳物砂の嵩密度と対応しており、嵩密度が大きくなるほど撹拌抵抗値は大きくなるので、上記最適な嵩密度範囲に対応する撹拌抵抗値の範囲を所定範囲に設定して、その所定範囲内になるまで鋳物砂を撹拌すれば、最適な嵩密度が得られることとなり、これにより、吹き込み充填工程において、鋳物砂がキャビティ内に常に良好に充填される。また、撹拌工程においては、鋳物砂を撹拌するだけであるので、撹拌工程で砂表面の溶剤が減少するようなことはなく、却って粘結剤、溶剤及び砂がより一層均一に混ざって好ましい。   As a result, the casting sand in the container is agitated and loosened before the casting sand is blown and filled into the cavity. Here, if the bulk density of the foundry sand is too large, the foundry sand is clogged in the blow nozzle, making it difficult to get out of the blow nozzle. On the other hand, if the foundry sand is loosened too much and the bulk density becomes too small, the pressurized gas is blown into the blow nozzle. It is difficult for the foundry sand to come out of the blow nozzle at this time. That is, there exists an optimum bulk density range in which the foundry sand is efficiently blown from the blow nozzle. On the other hand, if the foundry sand in the container is not agitated, the bulk density of the foundry sand is usually larger than the optimum bulk density range, and the more the number of blow-filling steps is increased, the more the casting sand is pressed by pressurized gas. The bulk density of sand is increasing. Therefore, before the blow-filling step, the foundry sand in the housing portion is stirred by the stirring member so that the bulk density of the foundry sand falls within the optimum bulk density range. That is, the stirring resistance value of the stirring member corresponds to the bulk density of the foundry sand, and the stirring resistance value increases as the bulk density increases. Therefore, the range of the stirring resistance value corresponding to the optimal bulk density range is within a predetermined range. If the foundry sand is stirred until it is within the predetermined range, the optimum bulk density can be obtained. Thus, the foundry sand is always satisfactorily filled into the cavity in the blow filling process. Further, in the stirring step, only the foundry sand is stirred, so that the solvent on the sand surface is not reduced in the stirring step, and on the contrary, the binder, solvent and sand are preferably mixed more uniformly.

また、鋳物砂量が異なると、鋳物砂の嵩密度と撹拌部材の撹拌抵抗値との関係も変化するので、鋳物砂量に応じて、最適な嵩密度に対応する撹拌抵抗値を所定範囲に設定することができる。Also, if the amount of foundry sand is different, the relationship between the bulk density of the foundry sand and the stirring resistance value of the stirring member also changes, so that the stirring resistance value corresponding to the optimum bulk density falls within a predetermined range according to the amount of foundry sand. Can be set.

請求項２の発明では、請求項１の発明において、上記撹拌工程、吹き込み充填工程及び硬化工程は、繰り返し行われ、上記所定範囲は、上記各撹拌工程毎に設定されたものであるとする。   In the invention of claim 2, in the invention of claim 1, the stirring step, the blow filling step and the curing step are repeatedly performed, and the predetermined range is set for each of the stirring steps.

この請求項２の発明により、各撹拌工程毎に収容部内の鋳物砂量に応じて所定範囲を適切に設定することができる。すなわち、吹き込み充填工程を１回行うと、キャビティ内に充填された量だけ収容部内の鋳物砂量が少なくなり、収容部内に鋳物砂を補充しない場合には、次の撹拌工程においては、前回の撹拌工程と鋳物砂量が異なることになる。一方、鋳物砂量が異なると、鋳物砂の嵩密度と撹拌部材の撹拌抵抗値との関係も変化するので、鋳物砂量に応じて、最適な嵩密度に対応する撹拌抵抗値を所定範囲に設定することができ、よって、いずれの撹拌工程でも、良好で安定した充填性が得られる。 The invention of claim 2 of this, it is possible to appropriately set the predetermined range in accordance with the amount of casting sand in the housing part in each stirring step. That is, when the blow filling process is performed once, the amount of foundry sand in the accommodating portion is reduced by the amount filled in the cavity, and when the foundry sand is not replenished in the accommodating portion, in the next stirring step, The stirring process and the amount of foundry sand will be different. On the other hand, if the amount of foundry sand is different, the relationship between the bulk density of the foundry sand and the stirrer resistance value of the stirrer member also changes, so that the stirrer resistance value corresponding to the optimum bulk density falls within a predetermined range according to the amount of foundry sand. Therefore, good and stable filling properties can be obtained in any stirring step.

請求項３の発明では、請求項１の発明において、上記鋳物砂は、粘結剤及び溶剤を含み、上記撹拌工程の前又は撹拌工程中に、上記収容部内に上記溶剤を補充する溶剤補充工程を含むものとする。 In the invention of claim 3, in the invention of claim 1, the foundry sand contains a binder and a solvent, and the solvent replenishing step of replenishing the solvent in the housing portion before or during the stirring step. Shall be included.

こうすることで、特に、撹拌工程、吹き込み充填工程及び硬化工程を繰り返し行う場合に、砂表面の溶剤の減少を抑制することができる。すなわち、吹き込み充填工程では、鋳物砂をキャビティ内に吹き込み充填するために収容部内に加圧気体を供給するが、この加圧気体により砂表面の溶剤が或る程度の量だけ飛んで減少することとなる。しかし、この発明では、上記溶剤の減少分を補充することができ、鋳型の品質の低下を抑制することができる。また、このように溶剤を補充しても、撹拌工程における撹拌によって、粘結剤、溶剤及び砂を均一に混ぜることができ、収容部内において部分的に溶剤が多くなりすぎるようなこともない。   By carrying out like this, especially when performing a stirring process, a blowing filling process, and a hardening process repeatedly, the reduction | decrease of the solvent of the sand surface can be suppressed. That is, in the blowing and filling process, pressurized gas is supplied into the housing portion in order to blow and fill the foundry sand into the cavity, and this pressurized gas reduces the amount of solvent on the sand surface by a certain amount. It becomes. However, in the present invention, the decrease in the solvent can be supplemented, and the deterioration of the mold quality can be suppressed. Even if the solvent is replenished in this way, the binder, the solvent and the sand can be uniformly mixed by stirring in the stirring step, and there is no case where the solvent is excessively increased in the housing portion.

請求項４の発明は、ガス硬化性鋳物砂を収容する収容部と該収容部に連通するように設けられたブローノズルとを有するブローヘッドと、該ブローヘッドの収容部内に加圧気体を供給する加圧気体供給装置とを備え、該加圧気体供給装置により上記収容部内に加圧気体を供給することで、該収容部内の鋳物砂を上記ブローノズルを介して成形型のキャビティ内に吹き込み充填するように構成された鋳型造型装置の発明である。 According to a fourth aspect of the present invention, there is provided a blow head having a housing portion for housing gas curable foundry sand and a blow nozzle provided to communicate with the housing portion, and supplying pressurized gas into the housing portion of the blow head. A pressurized gas supply device that supplies the pressurized gas into the housing portion by the pressurized gas supply device, thereby blowing the foundry sand in the housing portion into the cavity of the mold through the blow nozzle. It is an invention of a mold making apparatus configured to fill.

そして、この発明では、上記収容部内の鋳物砂を撹拌する撹拌部材と、上記撹拌部材を駆動する撹拌部材駆動手段と、上記撹拌部材の撹拌抵抗値を検出する撹拌抵抗値検出手段と、上記撹拌部材駆動手段の作動を制御する作動制御手段とを備え、上記作動制御手段は、上記加圧気体供給装置による上記収容部内への加圧気体の供給前に、上記撹拌部材駆動手段を、上記撹拌抵抗値検出手段により検出される撹拌抵抗値が所定範囲内になるまで作動させるように構成され、上記収容部内の鋳物砂量を検出する鋳物砂量検出手段を更に備え、更に上記作動制御手段は、予め上記収容部内の鋳物砂量と上記所定範囲との関係を記憶したテーブルを有していて、上記鋳物砂量検出手段により検出された鋳物砂量に基づいて、上記テーブルより上記所定範囲を設定するように構成されているものとする。 And in this invention, the stirring member which stirs the foundry sand in the said accommodating part, the stirring member drive means which drives the said stirring member, the stirring resistance value detection means which detects the stirring resistance value of the said stirring member, and the said stirring An operation control means for controlling the operation of the member drive means, wherein the operation control means is configured such that the agitation member drive means is agitated before the pressurized gas is supplied into the accommodating portion by the pressurized gas supply device. It is configured to operate until the stirring resistance value detected by the resistance value detection means falls within a predetermined range , further comprising a foundry sand amount detecting means for detecting the amount of foundry sand in the housing portion, and the operation control means further comprises A table storing the relationship between the amount of foundry sand in the housing portion and the predetermined range in advance, and based on the amount of foundry sand detected by the foundry sand amount detecting means, It is assumed to be configured to set the circumference.

この発明により、請求項１の発明と同様の作用効果が得られる。   According to the present invention, the same effect as that attained by the 1st aspect can be attained.

請求項５の発明では、請求項４の発明において、上記鋳物砂は、粘結剤及び溶剤を含み、上記作動制御手段によって作動制御され、上記収容部内に上記溶剤を噴霧して補充する溶剤噴霧装置を備え、上記作動制御手段は、上記撹拌部材駆動手段の作動前又は作動中に上記溶剤噴霧装置を作動させて、上記収容部内に上記溶剤を補充させるように構成されているものとする。こうすることで、請求項３の発明と同様の作用効果を得ることができる。 In the invention of claim 5, in the invention of claim 4 , the foundry sand contains a binder and a solvent, is controlled by the operation control means, and is replenished by spraying the solvent into the housing part. It is assumed that the operation control means is configured to operate the solvent spraying apparatus before or during operation of the stirring member driving means to replenish the solvent in the housing portion. Thus, the same effect as that attained by the 3rd aspect can be attained.

以上説明したように、本発明の鋳型造型方法及びその装置によると、ブローヘッドの収容部内に収容された鋳物砂のキャビティ内への吹き込み充填前に、その収容部内の鋳物砂を、撹拌部材によって、該撹拌部材の撹拌抵抗値が所定範囲内になるまで撹拌するとともに、鋳物砂量検出手段により検出された鋳物砂量に基づいて、予め収容部内の鋳物砂量と上記所定範囲との関係を記憶したテーブルより上記所定範囲を設定するようにしたことにより、ガス硬化性鋳物砂の嵩密度を、鋳物砂量に応じて、鋳物砂がブローノズルから効率良く吹き出す最適な範囲にすることができ、これにより、鋳物砂をキャビティ内に充填する前に硬化させることなく、鋳物砂のキャビティ内への充填性を良好にかつ安定させることができる。 As described above, according to the mold molding method and the apparatus of the present invention, the casting sand in the housing portion is blown and filled by the stirring member before the molding sand accommodated in the housing portion of the blow head is blown into the cavity. And stirring until the stirring resistance value of the stirring member falls within a predetermined range, and based on the amount of foundry sand detected by the foundry sand amount detecting means, the relationship between the amount of foundry sand in the accommodating portion and the predetermined range is determined in advance. By setting the above predetermined range from the stored table , the bulk density of the gas curable foundry sand can be set to an optimum range in which the foundry sand is efficiently blown from the blow nozzle according to the amount of foundry sand. This makes it possible to satisfactorily and stably fill the casting sand into the cavity without hardening the casting sand before filling the cavity.

以下、本発明の実施形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の実施形態に係る鋳型造型装置を概略的に示し、この鋳型造型装置は、コールドボックス鋳型造型装置であって、ガス硬化性鋳物砂４１を収容する収容部２を有するブローヘッド１を備えている。上記鋳物砂４１は、フェノール樹脂及びポリイソシアネート化合物からなる粘結剤と溶剤とを含み、砂表面が該粘結剤及び溶剤により覆われてなる。上記粘結剤のフェノール樹脂は、ベンジルエーテル基をその分子内に有するフェノール、ノボラック又はこれらから誘導される樹脂である。上記ポリイソシアネート化合物は、例えば、ジフェニルメタンジイソシアネート、ヘキサメチレンジイソシアネート、４，４′−ジシクロヘキシルメタンジイソシアネート等である。また、上記溶剤は、脂肪族炭化水素系、脂環式炭化水素系、芳香族炭化水素系、ハロゲン化炭化水素系、ケトン系、エステル系、エーテル系、アルコール系等の有機溶剤の単独又は混合したものからなる。   FIG. 1 schematically shows a mold making apparatus according to an embodiment of the present invention. This mold making apparatus is a cold box mold making apparatus, and has a blow section having a containing portion 2 for containing a gas curable foundry sand 41. A head 1 is provided. The foundry sand 41 includes a binder made of a phenol resin and a polyisocyanate compound and a solvent, and the sand surface is covered with the binder and the solvent. The phenol resin of the binder is phenol, novolak or a resin derived from these having a benzyl ether group in the molecule. Examples of the polyisocyanate compound include diphenylmethane diisocyanate, hexamethylene diisocyanate, and 4,4′-dicyclohexylmethane diisocyanate. The solvent may be an aliphatic hydrocarbon-based, alicyclic hydrocarbon-based, aromatic hydrocarbon-based, halogenated hydrocarbon-based, ketone-based, ester-based, ether-based, or alcohol-based organic solvent alone or in combination. Made up of.

上記鋳物砂４１は、上記収容部２の上側に配設した混練部３から収容部２へと供給される。すなわち、混練部３には、上記粘結剤、溶剤及び砂が投入され、これらが、回転駆動される混練機４によって均一に混練されて、上記の如く砂表面が粘結剤及び溶剤により覆われてなる鋳物砂４１となる。そして、収容部２と混練部３との間には、シャッター駆動機構６により開閉されるシャッター５が配設されており、このシャッター駆動機構６は、コントローラ３１によって作動制御される。上記シャッター５がシャッター駆動機構６により開かれると、鋳物砂４１が混練部３から自重で落下して収容部２に供給されることになる。   The foundry sand 41 is supplied from the kneading section 3 disposed above the housing section 2 to the housing section 2. That is, the binder, the solvent and the sand are put into the kneading unit 3, and these are uniformly kneaded by the kneader 4 which is driven to rotate, and the sand surface is covered with the binder and the solvent as described above. The resulting casting sand 41 is obtained. A shutter 5 that is opened and closed by a shutter drive mechanism 6 is disposed between the storage unit 2 and the kneading unit 3, and the operation of the shutter drive mechanism 6 is controlled by a controller 31. When the shutter 5 is opened by the shutter driving mechanism 6, the foundry sand 41 falls from the kneading unit 3 by its own weight and is supplied to the storage unit 2.

上記ブローヘッド１の下面には、上記収容部２内の鋳物砂４１を吹き出すための複数のブローノズル９が該収容部２に連通するように設けられている。このブローノズル２は、本鋳型造型装置の下側にセットされた複数の成形型３５で形成されてなるキャビティ３６に臨むようになされ、ブローノズル９から吹き出された鋳物砂４１がキャビティ３６内に充填されて、本鋳型造型装置により造型する鋳型の形状とされる。本鋳型造型装置により造型する鋳型としては、シリンダブロックやシリンダヘッドの鋳型、シリンダヘッドのウォータジャケット用中子等が挙げられる。   On the lower surface of the blow head 1, a plurality of blow nozzles 9 for blowing the foundry sand 41 in the housing portion 2 are provided so as to communicate with the housing portion 2. The blow nozzle 2 faces a cavity 36 formed by a plurality of molds 35 set on the lower side of the mold making apparatus, and foundry sand 41 blown from the blow nozzle 9 is placed in the cavity 36. Filled and made into the shape of a mold to be molded by the present mold making apparatus. Examples of the mold to be molded by the present mold making apparatus include a cylinder block, a cylinder head mold, and a water jacket core for the cylinder head.

上記ブローヘッド１における収容部２を構成する側壁面の上部には、加圧気体としての加圧エアを収容部２内に供給するためのエア供給口１ａが設けられている。このエア供給口１ａは、上記コントローラ３１によって作動制御される電磁弁１１を介してエアタンク１２と接続されており、このエアタンク１２内には、工場エアがレギュレータ（図示せず）により一定圧力（０．２ＭＰａ〜１ＭＰａ程度）とされた状態で供給されて、上記加圧エアとして貯蔵されている。そして、電磁弁１１が作動すると、エアタンク１２内の加圧エアが収容部２内に供給され、これにより、収容部２内の鋳物砂４１が上記ブローノズル９を介して成形型３５のキャビティ３６内に吹き込み充填されることになる。このことで、電磁弁１１、エアタンク１２及びコントローラ３１は、収容部２内に加圧気体を供給する加圧気体供給装置を構成する。尚、鋳物砂４１と共にキャビティ３６内に吹き込まれた加圧エアは、成形型３５の下部に設けたエアベント３７よりキャビティ３６外へと抜け出るようになっている。   An air supply port 1 a for supplying pressurized air as pressurized gas into the accommodating portion 2 is provided at the upper portion of the side wall surface constituting the accommodating portion 2 in the blow head 1. The air supply port 1a is connected to an air tank 12 via an electromagnetic valve 11 that is controlled by the controller 31. Factory air is supplied into the air tank 12 by a regulator (not shown). About 2 MPa to 1 MPa) and stored as the pressurized air. When the electromagnetic valve 11 is activated, the pressurized air in the air tank 12 is supplied into the housing portion 2, whereby the foundry sand 41 in the housing portion 2 is passed through the blow nozzle 9 and the cavity 36 of the mold 35. It will be blown and filled inside. Thus, the solenoid valve 11, the air tank 12, and the controller 31 constitute a pressurized gas supply device that supplies pressurized gas into the housing portion 2. The pressurized air blown into the cavity 36 together with the foundry sand 41 escapes from the cavity 36 through an air vent 37 provided at the lower part of the mold 35.

また、上記収容部２を構成する側壁面の上部には、収容部２内に上記溶剤を補充するための溶剤供給口１ｂが設けられている。この溶剤供給口１ｂは、収容部２内に上記溶剤を噴霧して補充する溶剤噴霧装置１５と接続されている。この溶剤噴霧装置１５は、上記コントローラ３１によって作動制御され、後述の撹拌部材駆動手段２２の駆動モータ２２ａの作動前に作動して、収容部２内に所定量の溶剤を噴霧して補充するようになっている。すなわち、前回の鋳物砂４１のキャビティ３６への吹き込み充填時に、加圧エアにより砂表面の溶剤が或る程度の量だけ飛んで減少しているので、その減少分と略同じ量の溶剤を補充する。   In addition, a solvent supply port 1 b for replenishing the solvent in the storage unit 2 is provided at the upper part of the side wall surface constituting the storage unit 2. The solvent supply port 1 b is connected to a solvent spraying device 15 that sprays and replenishes the solvent in the storage unit 2. The solvent spraying device 15 is controlled by the controller 31 and operates before a driving motor 22a of the agitating member driving means 22 to be described later, so as to spray and replenish a predetermined amount of solvent in the housing portion 2. It has become. That is, at the time of the previous filling and filling of the foundry sand 41 into the cavity 36, the amount of solvent on the sand surface is reduced by a certain amount due to the pressurized air, and therefore, approximately the same amount of solvent is replenished. To do.

さらに、上記ブローヘッド１の収容部２内の上部には、収容部２内の鋳物砂４１の量を検出する鋳物砂量検出手段としての鋳物砂量検出センサ１６が設けられている。この鋳物砂量検出センサ１６は、本実施形態では、赤外線を下方に放出して最上部の鋳物砂４１により反射してきた赤外線を受信してその強度によって収容部２内の鋳物砂４１の量を検出するものであるが、他の構成のセンサを用いてもよい。この鋳物砂量検出センサ１６により検出された収容部２内の鋳物砂４１の量の情報が上記コントローラ３１に入力されるようになっている。   Further, a foundry sand amount detection sensor 16 as a foundry sand amount detecting means for detecting the amount of foundry sand 41 in the accommodating portion 2 is provided at an upper portion in the accommodating portion 2 of the blow head 1. In the present embodiment, the foundry sand amount detection sensor 16 receives the infrared rays that are emitted downward and reflected by the uppermost foundry sand 41, and the amount of the foundry sand 41 in the housing portion 2 is determined according to its intensity. Although it detects, you may use the sensor of another structure. Information on the amount of foundry sand 41 in the housing portion 2 detected by the foundry sand amount detection sensor 16 is input to the controller 31.

さらにまた、上記ブローヘッド１の収容部２内の下部には、収容部２内の鋳物砂４１を撹拌する撹拌部材２１が設けられている。この撹拌部材２１は、鋳物砂４１をほぐして、後述の如く最適な嵩密度にするためのものであって、上下方向に延びかつ回転可能に支持された回転軸２１ａと、この回転軸２１ａの下端部に固定されかつ水平方向に延びる基板２１ｂと、この基板２１ｂ上に設けられた複数の撹拌棒２１ｃとからなっている。上記回転軸２１ａの上端部は、撹拌部材駆動手段２２と連結されている。この撹拌部材駆動手段２２の詳細構成は省略するが、駆動モータ２２ａと、この駆動モータ２２ａの回転軸と上記回転軸２１ａとを連結する、例えば曲げ自在なワイヤ等からなる連結部材と、駆動モータ２２ａを駆動するための駆動回路等を有している。この駆動回路には、駆動モータ２２ａに流れる電流値を検出する電流検出部２２ｂが設けられている。 Furthermore, an agitating member 21 for agitating the foundry sand 41 in the accommodating portion 2 is provided at the lower portion in the accommodating portion 2 of the blow head 1. The stirring member 21 is for loosening the foundry sand 41 to obtain an optimum bulk density as will be described later. The stirring member 21 extends in the vertical direction and is rotatably supported. a substrate 21b extending in a fixed and horizontal on the lower end, has a plurality of stirring rods 21c provided on the substrate 21 b. The upper end portion of the rotating shaft 21 a is connected to the stirring member driving means 22. Although the detailed configuration of the stirring member driving means 22 is omitted, a driving motor 22a, a connecting member made of, for example, a bendable wire for connecting the rotating shaft of the driving motor 22a and the rotating shaft 21a, and a driving motor. It has a drive circuit for driving 22a. This drive circuit is provided with a current detection unit 22b that detects a current value flowing through the drive motor 22a.

上記撹拌部材駆動手段２２の駆動モータ２２ａは、上記コントローラ３１によって作動制御される。つまり、コントローラ３１は、撹拌部材駆動手段２２の駆動モータ２２ａの作動を制御する作動制御手段を構成する。そして、駆動モータ２２ａの作動中は、上記電流検出部２２ｂにより検出された電流値の情報が上記コントローラ３１に入力される。   The drive motor 22 a of the stirring member driving means 22 is controlled by the controller 31. That is, the controller 31 constitutes an operation control unit that controls the operation of the drive motor 22 a of the stirring member driving unit 22. During the operation of the drive motor 22a, information on the current value detected by the current detector 22b is input to the controller 31.

上記コントローラ３１は、収容部２内の鋳物砂４１のキャビティ３６への吹き込み充填前において、上記駆動モータ２２ａを、撹拌部材２１の撹拌抵抗値が所定範囲内になるまで作動させるようになっている。本実施形態では、撹拌部材２１の撹拌抵抗値を、上記電流検出部２２ｂによって検出する。すなわち、駆動モータ２２ａの電流値は、上記撹拌部材２１を回転するのに必要なモータトルク、つまり撹拌部材２１の撹拌抵抗値と対応しており、撹拌部材２１の撹拌抵抗値が大きくなるほど駆動モータ２２ａの電流値は増大する。したがって、上記撹拌抵抗値の所定範囲に対応して所定電流範囲を設定しておき、駆動モータ２２ａを、上記電流検出部２２ｂにより検出された電流値が所定電流範囲内になるまで作動させるようにしている。このことで、上記電流検出部２２ｂは、撹拌部材２１の撹拌抵抗値を検出する撹拌抵抗値検出手段を構成することになる。   The controller 31 operates the drive motor 22a until the stirring resistance value of the stirring member 21 falls within a predetermined range before the casting sand 41 in the housing portion 2 is blown and filled into the cavity 36. . In the present embodiment, the stirring resistance value of the stirring member 21 is detected by the current detection unit 22b. That is, the current value of the drive motor 22a corresponds to the motor torque required to rotate the stirring member 21, that is, the stirring resistance value of the stirring member 21, and the drive motor increases as the stirring resistance value of the stirring member 21 increases. The current value of 22a increases. Accordingly, a predetermined current range is set corresponding to the predetermined range of the stirring resistance value, and the drive motor 22a is operated until the current value detected by the current detection unit 22b falls within the predetermined current range. ing. Thus, the current detection unit 22b constitutes a stirring resistance value detection unit that detects the stirring resistance value of the stirring member 21.

上記撹拌抵抗値の所定範囲、つまり所定電流範囲は、収容部２内の鋳物砂４１がブローノズル９から効率良く吹き出す範囲に設定される。ここで、収容部２内の鋳物砂４１の量を一定にしてその鋳物砂４１の嵩密度を変化させて、鋳物砂４１の嵩密度と、ブローノズル９から吹き出される鋳物砂４１の速度及び質量から求まる運動エネルギーとの関係を調べた結果を図２に示す。すなわち、運動エネルギーが最大ないしそれに近い値となる嵩密度範囲、つまり鋳物砂４１がブローノズル９から効率良く吹き出す最適な嵩密度範囲が存在する。これは、鋳物砂４１の嵩密度が大きすぎると、鋳物砂４１がブローノズル９に詰まって該ブローノズル９から出難くなる一方、鋳物砂４１をほぐしすぎて嵩密度が小さくなりすぎると、加圧エアがブローノズル９から抜けるだけで、このときも鋳物砂４１がブローノズル９から出難くなるからである。   The predetermined range of the stirring resistance value, that is, the predetermined current range, is set to a range in which the foundry sand 41 in the housing portion 2 is efficiently blown out from the blow nozzle 9. Here, by changing the bulk density of the foundry sand 41 while keeping the amount of the foundry sand 41 in the accommodating portion 2 constant, the bulk density of the foundry sand 41, the speed of the foundry sand 41 blown out from the blow nozzle 9, and FIG. 2 shows the result of examining the relationship with the kinetic energy obtained from the mass. That is, there is a bulk density range in which the kinetic energy is a maximum value or a value close thereto, that is, an optimum bulk density range in which the foundry sand 41 is efficiently blown from the blow nozzle 9. This is because, if the bulk density of the foundry sand 41 is too large, the foundry sand 41 is clogged in the blow nozzle 9 and is difficult to come out of the blow nozzle 9, while if the foundry sand 41 is too loosened and the bulk density becomes too small, This is because it is difficult for the foundry sand 41 to come out of the blow nozzle 9 only at this time when the compressed air escapes from the blow nozzle 9.

また、鋳物砂４１の嵩密度と撹拌部材２１の撹拌抵抗値（駆動モータのモータトルク）との関係を調べた結果を図３に示す。このように撹拌部材２１の撹拌抵抗値は鋳物砂４１の嵩密度と対応しており、嵩密度が大きくなるほど撹拌抵抗値は大きくなる。したがって、上記最適な嵩密度範囲に対応する撹拌抵抗値の範囲を上記所定範囲に設定すればよく、この所定範囲に対応する電流範囲を上記所定電流範囲に設定する。   Moreover, the result of having investigated the relationship between the bulk density of the foundry sand 41 and the stirring resistance value (motor torque of the drive motor) of the stirring member 21 is shown in FIG. Thus, the stirring resistance value of the stirring member 21 corresponds to the bulk density of the foundry sand 41, and the stirring resistance value increases as the bulk density increases. Accordingly, the range of the stirring resistance value corresponding to the optimum bulk density range may be set to the predetermined range, and the current range corresponding to the predetermined range is set to the predetermined current range.

上記最適な嵩密度範囲は、収容部２内の鋳物砂４１の量によって変わるため、上記鋳物砂量検出センサ１６によって鋳物砂４１の量を検出するようにしている。すなわち、鋳物砂４１の量と最適な嵩密度範囲（つまり上記所定電流範囲）との関係を予め調べてテーブルにしておき、そのテーブルを上記コントローラ３１に記憶しておく。そして、コントローラ３１は、鋳物砂量検出センサ１６からの鋳物砂４１の量の情報を受けて、上記テーブルより、その鋳物砂４１の量に対応する所定電流範囲を設定する。   Since the optimum bulk density range varies depending on the amount of foundry sand 41 in the housing portion 2, the amount of foundry sand 41 is detected by the foundry sand amount detection sensor 16. That is, the relationship between the amount of the foundry sand 41 and the optimum bulk density range (that is, the predetermined current range) is examined in advance to be a table, and the table is stored in the controller 31. The controller 31 receives information on the amount of foundry sand 41 from the foundry sand amount detection sensor 16 and sets a predetermined current range corresponding to the amount of foundry sand 41 from the table.

上記鋳物砂量検出センサ１６により検出された鋳物砂４１の量が所定量よりも少なくなったとき、つまり鋳物砂４１の残量が少なくてキャビティ３６へ充填するだけの充分な量がないときには、コントローラ３１がシャッター駆動機構６を作動させて、鋳物砂４１を混練部３から収容部２へ供給する。   When the amount of foundry sand 41 detected by the foundry sand amount detection sensor 16 is smaller than a predetermined amount, that is, when the remaining amount of foundry sand 41 is small and there is not enough amount to fill the cavity 36, The controller 31 operates the shutter drive mechanism 6 to supply the foundry sand 41 from the kneading unit 3 to the storage unit 2.

次いで、上記コントローラ３１の処理動作について、図４のフローチャートを参照しながら説明する。   Next, the processing operation of the controller 31 will be described with reference to the flowchart of FIG.

先ず、最初のステップＳ１で、溶剤噴霧装置１５を作動させて、収容部２内に所定量の溶剤を噴霧して補充し、次のステップＳ２で、所定電流範囲を設定する。すなわち、鋳物砂量検出センサ１６により検出された鋳物砂４１の量と上記テーブルとに基づいて、所定電流範囲を設定する。   First, in the first step S1, the solvent spraying device 15 is operated to spray and replenish a predetermined amount of solvent into the container 2, and in the next step S2, a predetermined current range is set. That is, the predetermined current range is set based on the amount of foundry sand 41 detected by the foundry sand amount detection sensor 16 and the table.

続いて、次のステップＳ３で、撹拌部材駆動手段２２の駆動モータ２２ａを作動させ、次のステップＳ４で、電流検出部２２ｂにより検出された電流値が所定電流範囲内にあるか否かを判定する。   Subsequently, in the next step S3, the drive motor 22a of the stirring member driving means 22 is operated, and in the next step S4, it is determined whether or not the current value detected by the current detection unit 22b is within a predetermined current range. To do.

上記ステップＳ４の判定がＮＯであるときには、ステップＳ３に戻る一方、ステップＳ４の判定がＹＥＳであるときには、ステップＳ５に進んで、駆動モータ２２ａを停止させ、次のステップＳ６で、電磁弁１１を作動させてエアタンク１２の加圧エアを収容部２内に供給する。   When the determination in step S4 is NO, the process returns to step S3. On the other hand, when the determination in step S4 is YES, the process proceeds to step S5 to stop the drive motor 22a, and in the next step S6, the electromagnetic valve 11 is turned off. The pressurized air in the air tank 12 is supplied into the accommodating portion 2 by operating.

次のステップＳ７では、鋳物砂量検出センサ１６により検出された鋳物砂４１の量が所定量よりも少ないか否かを判定し、このステップＳ７の判定がＮＯであるときには、本処理動作を終了する。一方、ステップＳ７の判定がＹＥＳであるときには、ステップＳ８に進んで、シャッタ−駆動機構６を作動させ、しかる後に本処理動作を終了する。   In the next step S7, it is determined whether or not the amount of foundry sand 41 detected by the foundry sand amount detection sensor 16 is smaller than a predetermined amount. If the determination in step S7 is NO, this processing operation is terminated. To do. On the other hand, when the determination in step S7 is YES, the process proceeds to step S8 to operate the shutter drive mechanism 6, and then this processing operation is terminated.

次に上記鋳型造型装置により鋳型を造型する方法を説明する。   Next, a method for forming a mold using the above mold making apparatus will be described.

最初に上記鋳型造型装置に成形型３５をセットしておき、スイッチ操作等によって鋳型造型装置を作動させる。すると、収容部２内に所定量の溶剤が補充され（溶剤補充工程）、その後、撹拌部材２１の基板２１ｂが回転軸２１ａ周りに回転し、その基板２１ｂ上に設けられた複数の撹拌棒２１ｃによって、収容部２内の鋳物砂４１が撹拌されてほぐされる（撹拌工程）。このとき、粘結剤、溶剤（上記補充分を含む）及び砂が均一に混ぜられる。そして、収容部２内の鋳物砂４１の嵩密度は、撹拌部材２１の駆動当初は、通常、上記最適な嵩密度範囲よりも大きいが、撹拌部材２１による撹拌によって次第に小さくなり、やがて最適な嵩密度範囲内となる。これにより、電流検出部２２ｂにより検出された電流値が所定電流範囲内となって撹拌部材２１の駆動が停止される。   First, the mold 35 is set in the mold making apparatus, and the mold making apparatus is operated by a switch operation or the like. Then, a predetermined amount of solvent is replenished in the container 2 (solvent replenishment step), and then the substrate 21b of the stirring member 21 rotates around the rotation shaft 21a, and a plurality of stirring rods 21c provided on the substrate 21b. Thus, the foundry sand 41 in the container 2 is stirred and loosened (stirring step). At this time, the binder, the solvent (including the replenisher) and sand are mixed uniformly. The bulk density of the foundry sand 41 in the housing portion 2 is usually larger than the optimum bulk density range when the stirring member 21 is initially driven. However, the bulk density gradually decreases as a result of stirring by the stirring member 21, and eventually the optimum bulk density is reached. Within the density range. As a result, the current value detected by the current detector 22b falls within the predetermined current range, and the drive of the stirring member 21 is stopped.

続いて、エアタンク１２の加圧エアが収容部２内に供給され、これにより、収容部２内の鋳物砂４１が、ブローノズル９を介して成形型３５のキャビティ３６内に吹き込み充填される（吹き込み充填工程）。この吹き込み充填工程においては、該吹き込み充填工程の前に、鋳物砂４１の嵩密度を、鋳物砂４１がブローノズル９から効率良く吹き出す最適な嵩密度範囲内になるようにしたので、鋳物砂４１がキャビティ３６内に良好に充填される。   Subsequently, the pressurized air in the air tank 12 is supplied into the housing portion 2, whereby the foundry sand 41 in the housing portion 2 is blown and filled into the cavity 36 of the molding die 35 through the blow nozzle 9 ( Blow filling process). In this blow filling process, the bulk density of the foundry sand 41 is set within the optimum bulk density range in which the foundry sand 41 is efficiently blown from the blow nozzle 9 before the blow filling process. Is satisfactorily filled into the cavity.

上記吹き込み充填工程の後は、本実施形態では、上記成形型３５を、該成形型３５のキャビティ３６内に硬化ガスを導入するために別途に設けた不図示の硬化ガス導入装置のところまで移動させて該硬化ガス導入装置にセットする。そして、この硬化ガス導入装置により、キャビティ３６内に硬化ガス（例えばトリエチルアミンガス）を導入することで、該キャビティ３６内に充填された鋳物砂４１を硬化させ（硬化工程）、こうして品質の良好な鋳型の造型が完成する。   After the blowing and filling step, in the present embodiment, the molding die 35 is moved to a curing gas introduction device (not shown) separately provided for introducing the curing gas into the cavity 36 of the molding die 35. And set in the curing gas introducing device. Then, by introducing a curing gas (for example, triethylamine gas) into the cavity 36 by the curing gas introducing device, the foundry sand 41 filled in the cavity 36 is cured (curing process), and thus the quality is good. Mold making is completed.

次の新たな鋳型を造型するために鋳型造型装置に成形型３５を再びセットして鋳型造型装置を再び作動させると、上記と同様に、溶剤補充工程、撹拌工程及び吹き込み充填工程が順次行われる。このときの溶剤補充工程においては、前回の吹き込み充填工程における加圧エアによって砂表面の溶剤が或る程度の量だけ飛んで減少しているが、その溶剤の減少分を補充することができる。   When the mold 35 is set again in the mold making apparatus and the mold making apparatus is operated again in order to form the next new mold, the solvent replenishing step, the stirring step, and the blow filling step are sequentially performed as described above. . In the solvent replenishment step at this time, the solvent on the sand surface is reduced by a certain amount due to the pressurized air in the previous blowing and filling step, but the decrease in the solvent can be replenished.

そして、次の撹拌工程において、粘結剤、溶剤（上記補充分を含む）及び砂がより一層均一に混ぜられる。また、通常、前回の撹拌工程に比べて鋳物砂４１の量が少なくなっている（但し、鋳物砂４１が混練部３から収容部２に供給されたときには、鋳物砂４１の量が多くなっている）が、その鋳物砂４１の量に対応した最適な嵩密度範囲（所定電流範囲）が設定される。このように各撹拌工程毎に収容部内の鋳物砂４１の量に基づいて最適な嵩密度範囲（所定電流範囲）が設定され、撹拌工程の開始当初は、前回の吹き込み充填工程における加圧エアの加圧によって、収容部２内の鋳物砂４１の嵩密度が該最適な嵩密度範囲よりも高くなっているが、撹拌工程終了時には、鋳物砂４１の量に対応した最適な嵩密度範囲内となる。これにより、吹き込み充填工程においては、鋳物砂４１がキャビティ３６内に良好に充填される。そして、吹き込み充填工程の後は、上記と同様に、硬化工程が行われる。このように上記各工程を繰り返すことで、多数の鋳型を造型することができる。   Then, in the next stirring step, the binder, the solvent (including the replenishment part) and the sand are more uniformly mixed. Further, the amount of foundry sand 41 is usually smaller than that of the previous agitation step (however, when the foundry sand 41 is supplied from the kneading unit 3 to the accommodating unit 2, the amount of foundry sand 41 is increased. However, an optimum bulk density range (predetermined current range) corresponding to the amount of the foundry sand 41 is set. Thus, the optimum bulk density range (predetermined current range) is set for each stirring process based on the amount of foundry sand 41 in the accommodating portion, and at the beginning of the stirring process, the pressurized air in the previous blow filling process is set. Although the bulk density of the foundry sand 41 in the accommodating portion 2 is higher than the optimum bulk density range due to the pressurization, at the end of the stirring process, it is within the optimum bulk density range corresponding to the amount of the foundry sand 41. Become. Thereby, in the blow filling process, the foundry sand 41 is satisfactorily filled into the cavity 36. Then, after the blow filling process, a curing process is performed in the same manner as described above. By repeating the above steps as described above, a large number of molds can be formed.

尚、各吹き込み充填工程の後、鋳物砂４１の量が所定量よりも少なくなった場合には、シャッター駆動機構６の作動によってシャッター５が開状態となって鋳物砂４１が混練部３から収容部２へ供給される。   If the amount of foundry sand 41 is less than a predetermined amount after each blowing and filling step, the shutter 5 is opened by the operation of the shutter drive mechanism 6 and the foundry sand 41 is received from the kneading unit 3. Supplied to section 2.

したがって、上記実施形態では、鋳物砂４１のキャビティ３６内への吹き込み充填前に、鋳物砂４１を撹拌部材２１によって撹拌することで、鋳物砂４１の嵩密度を、鋳物砂４１がブローノズル９から効率良く吹き出す最適な嵩密度範囲内になるようにしたので、鋳物砂４１をキャビティ３６内に常に良好に充填することができる。   Therefore, in the above embodiment, the casting sand 41 is agitated by the stirring member 21 before the casting sand 41 is blown and filled into the cavity 36, so that the bulk density of the foundry sand 41 is reduced from the blow nozzle 9. Since it is within the optimum bulk density range for efficiently blowing, the foundry sand 41 can always be satisfactorily filled into the cavity 36.

また、撹拌工程においては、鋳物砂４１を撹拌するだけであるので、撹拌工程で砂表面の溶剤が減少するようなことはない。一方、前記の吹き込み充填工程で、溶剤が或る程度減少しているが、その減少分を溶剤噴霧装置１５の作動によって補充するので、鋳型の品質の低下を抑制することができる。   Further, in the stirring step, only the foundry sand 41 is stirred, so that the solvent on the sand surface does not decrease in the stirring step. On the other hand, although the solvent is reduced to some extent in the blowing and filling step, since the reduced amount is replenished by the operation of the solvent spraying device 15, it is possible to suppress the deterioration of the mold quality.

尚、上記実施形態では、撹拌部材２１の撹拌抵抗値を、撹拌部材駆動手段２２の駆動モータ２２ａに流れる電流値を検出する電流検出部２２ｂにより検出するようにしたが、これに限らず、例えば撹拌部材２１にトルクセンサを設けて、このトルクセンサで撹拌部材２１の撹拌抵抗値を検出するようにしてもよい。   In the above embodiment, the stirring resistance value of the stirring member 21 is detected by the current detection unit 22b that detects the value of the current flowing in the drive motor 22a of the stirring member driving means 22. However, the present invention is not limited to this. A torque sensor may be provided in the stirring member 21, and the stirring resistance value of the stirring member 21 may be detected by this torque sensor.

また、上記実施形態では、各撹拌工程において鋳物砂量検出センサ１６により鋳物砂４１の量を検出するようにしたが、この鋳物砂量検出センサ１６を用いないようにすることも可能である。すなわち、多数の同じ鋳型を造型する場合には、１回の吹き込み充填工程で減少する鋳物砂４１の量は略一定であるので、吹き込み充填工程を所定回数行ったときに、所定量（所定回数×１回の吹き込み充填工程での減少量）の鋳物砂４１を混練部３から収容部２へ供給するようにしておけば、各撹拌工程毎の鋳物砂４１の量は予め分かるので、各撹拌工程毎にその鋳物砂４１の量に対応する最適な嵩密度範囲（所定電流範囲）を予めコントローラ３１に記憶しておけばよい。   In the above embodiment, the amount of foundry sand 41 is detected by the foundry sand amount detection sensor 16 in each agitation step. However, it is possible not to use this foundry sand amount detection sensor 16. That is, when a large number of the same molds are formed, the amount of foundry sand 41 that decreases in one blowing and filling process is substantially constant. Therefore, when the blowing and filling process is performed a predetermined number of times, a predetermined amount (a predetermined number of times) If the amount of foundry sand 41 in a single blow-in filling step) is supplied from the kneading unit 3 to the accommodating unit 2, the amount of foundry sand 41 for each stirring step can be known in advance. What is necessary is just to memorize | store the optimal bulk density range (predetermined current range) corresponding to the quantity of the foundry sand 41 for every process in the controller 31 previously.

さらに、上記実施形態では、撹拌工程の前に、収容部２内に溶剤を補充するようにしたが、撹拌工程中に溶剤の補充を行うようにしてもよい。また、シャッター駆動機構６の作動による鋳物砂４１の混練部３から収容部２への供給直後は、溶剤の補充を行わないようにしてもよく、溶剤の補充量を少なくしてもよい。さらに、各撹拌工程の前の溶剤補充工程自体をなくしても、吹き込み充填工程での溶剤の減少量は僅かであるので、大きな問題とはならない。
本発明を適用することはできる。 Furthermore, in the above embodiment, the solvent is replenished in the container 2 before the stirring step, but the solvent may be replenished during the stirring step. Further, immediately after supply of the foundry sand 41 from the kneading unit 3 to the storage unit 2 by the operation of the shutter driving mechanism 6, the solvent may not be replenished, or the amount of solvent replenishment may be reduced. Furthermore, even if the solvent replenishment process itself before each stirring process is eliminated, the amount of solvent decrease in the blowing and filling process is small, so that this is not a big problem.
The present invention can be applied.

本発明は、ガス硬化性鋳物砂を成形型のキャビティ内に吹き込み充填する鋳型造型方法及びその装置に有用である。   INDUSTRIAL APPLICABILITY The present invention is useful for a mold making method and apparatus for blowing and filling gas curable foundry sand into a mold cavity.

本発明の実施形態に係る鋳型造型装置を示す概略構成図である。It is a schematic structure figure showing a mold making device concerning an embodiment of the present invention. 収容部内の鋳物砂の嵩密度とブローノズルから吹き出される鋳物砂の運動エネルギーとの関係を示すグラフである。It is a graph which shows the relationship between the bulk density of the foundry sand in a accommodating part, and the kinetic energy of the foundry sand blown out from a blow nozzle. 収容部内の鋳物砂の嵩密度と撹拌部材の撹拌抵抗値との関係を示すグラフである。It is a graph which shows the relationship between the bulk density of the foundry sand in a accommodating part, and the stirring resistance value of a stirring member. コントローラの処理動作を示すフローチャートである。It is a flowchart which shows the processing operation of a controller.

１ ブローヘッド
２ 収容部
９ ブローノズル
１１ 電磁弁（加圧気体供給装置）
１２ エアタンク（加圧気体供給装置）
１５ 溶剤噴霧装置
１６ 鋳物砂量検出センサ（鋳物砂量検出手段）
２１ 撹拌部材
２２ 撹拌部材駆動手段
２２ａ 駆動モータ
２２ｂ 電流検出部（撹拌抵抗値検出手段）
３１ コントローラ（作動制御手段）（加圧気体供給装置） 1 Blow Head 2 Housing 9 Blow Nozzle 11 Solenoid Valve (Pressurized Gas Supply Device)
12 Air tank (Pressurized gas supply device)
15 Solvent spraying device 16 Foundry sand amount detection sensor (casting sand amount detection means)
21 Stirring member 22 Stirring member driving means 22a Driving motor 22b Current detection unit (stirring resistance value detecting means)
31 controller (operation control means) (pressurized gas supply device)

Claims (5)

ガス硬化性鋳物砂を収容する収容部を有するブローヘッドの該収容部内で、該鋳物砂を撹拌する撹拌行程と、
上記撹拌工程の後に、上記収容部内に加圧気体を供給することで、該収容部内の鋳物砂を、収容部に連通するように設けたブローノズルを介して成形型のキャビティ内に吹き込み充填する吹き込み充填工程と、
上記吹き込み充填工程の後に、上記キャビティ内に硬化ガスを導入して、該キャビティ内に充填された鋳物砂を硬化させる硬化工程とを含む鋳型造型方法であって、
上記撹拌工程は、上記収容部内の鋳物砂を、撹拌部材によって、該撹拌部材の撹拌抵抗値が所定範囲内になるまで撹拌する工程であり、
予め、上記収容部内の鋳物砂量と上記所定範囲との関係を求めて該関係をテーブルに記憶しておく工程と、
上記撹拌工程の実行に際して、鋳物砂量検出手段により上記収容部内の鋳物砂量を検出して、該検出した鋳物砂量に基づいて、上記テーブルより上記所定範囲を設定する工程とを含むことを特徴とする鋳型造型方法。 A stirring step of stirring the foundry sand in the accommodating portion of the blow head having an accommodating portion for accommodating the gas curable foundry sand ;
After the stirring step, by supplying pressurized gas into the housing part, the foundry sand in the housing part is blown and filled into the cavity of the mold through the blow nozzle provided so as to communicate with the housing part. Blow filling process;
A mold making method including a curing step of introducing a curing gas into the cavity and curing the foundry sand filled in the cavity after the blowing and filling step,
The stirring step is a step of stirring the foundry sand in the housing part with a stirring member until the stirring resistance value of the stirring member is within a predetermined range ,
Preliminarily obtaining a relationship between the amount of foundry sand in the accommodating portion and the predetermined range and storing the relationship in a table;
A step of detecting the amount of foundry sand in the housing portion by the foundry sand amount detecting means, and setting the predetermined range from the table based on the detected amount of foundry sand when performing the stirring step. Characteristic mold making method. 請求項１記載の鋳型造型方法において、
上記撹拌工程、吹き込み充填工程及び硬化工程は、繰り返し行われ、
上記所定範囲は、上記各撹拌工程毎に設定されたものであることを特徴とする鋳型造型方法。 The mold making method according to claim 1,
The stirring step, blowing filling step and curing step are repeated,
The mold making method, wherein the predetermined range is set for each of the stirring steps. 請求項１記載の鋳型造型方法において、
上記鋳物砂は、粘結剤及び溶剤を含み、
上記撹拌工程の前又は撹拌工程中に、上記収容部内に上記溶剤を補充する溶剤補充工程を含むことを特徴とする鋳型造型方法。 The mold making method according to claim 1,
The foundry sand contains a binder and a solvent,
A mold making method characterized by including a solvent replenishing step of replenishing the solvent in the housing part before or during the stirring step. ガス硬化性鋳物砂を収容する収容部と該収容部に連通するように設けられたブローノズルとを有するブローヘッドと、該ブローヘッドの収容部内に加圧気体を供給する加圧気体供給装置とを備え、該加圧気体供給装置により上記収容部内に加圧気体を供給することで、該収容部内の鋳物砂を上記ブローノズルを介して成形型のキャビティ内に吹き込み充填するように構成された鋳型造型装置であって、
上記収容部内の鋳物砂を撹拌する撹拌部材と、
上記撹拌部材を駆動する撹拌部材駆動手段と、
上記撹拌部材の撹拌抵抗値を検出する撹拌抵抗値検出手段と、
上記撹拌部材駆動手段の作動を制御する作動制御手段とを備え、
上記作動制御手段は、上記加圧気体供給装置による上記収容部内への加圧気体の供給前に、上記撹拌部材駆動手段を、上記撹拌抵抗値検出手段により検出される撹拌抵抗値が所定範囲内になるまで作動させるように構成され、
上記収容部内の鋳物砂量を検出する鋳物砂量検出手段を更に備え、
更に上記作動制御手段は、予め上記収容部内の鋳物砂量と上記所定範囲との関係を記憶したテーブルを有していて、上記鋳物砂量検出手段により検出された鋳物砂量に基づいて、上記テーブルより上記所定範囲を設定するように構成されていることを特徴とする鋳型造型装置。 A blow head having a housing portion for housing gas curable foundry sand and a blow nozzle provided so as to communicate with the housing portion, and a pressurized gas supply device for supplying pressurized gas into the housing portion of the blow head; And is configured to blow and fill the molding sand in the housing portion into the cavity of the mold through the blow nozzle by supplying the pressurized gas into the housing portion by the pressurized gas supply device. A mold making device,
A stirring member that stirs the foundry sand in the housing portion;
Stirring member driving means for driving the stirring member;
A stirring resistance value detecting means for detecting the stirring resistance value of the stirring member;
An operation control means for controlling the operation of the stirring member driving means,
The operation control means is configured such that, before the pressurized gas is supplied into the housing portion by the pressurized gas supply device, the stirring member driving means is configured so that the stirring resistance value detected by the stirring resistance value detecting means is within a predetermined range. It is configured to actuate until,
Further comprising a foundry sand amount detecting means for detecting a foundry sand amount in the housing portion,
Further, the operation control means has a table that stores the relationship between the amount of foundry sand in the housing portion and the predetermined range in advance, and based on the amount of foundry sand detected by the foundry sand quantity detecting means, A mold making apparatus characterized in that the predetermined range is set from a table . 請求項４記載の鋳型造型装置において、
上記鋳物砂は、粘結剤及び溶剤を含み、
上記作動制御手段によって作動制御され、上記収容部内に上記溶剤を噴霧して補充する溶剤噴霧装置を備え、
上記作動制御手段は、上記撹拌部材駆動手段の作動前又は作動中に上記溶剤噴霧装置を作動させて、上記収容部内に上記溶剤を補充させるように構成されていることを特徴とする鋳型造型装置。 The mold making apparatus according to claim 4 , wherein
The foundry sand contains a binder and a solvent,
The operation is controlled by the operation control means, and includes a solvent spraying device that sprays and replenishes the solvent in the housing part,
The mold control apparatus, wherein the operation control means is configured to operate the solvent spraying apparatus before or during the operation of the stirring member driving means to replenish the solvent in the accommodating portion. .
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