JP4305833B2 - A method for reclaiming mold sand using a mechanical regenerator. - Google Patents
A method for reclaiming mold sand using a mechanical regenerator. Download PDFInfo
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- JP4305833B2 JP4305833B2 JP2003297027A JP2003297027A JP4305833B2 JP 4305833 B2 JP4305833 B2 JP 4305833B2 JP 2003297027 A JP2003297027 A JP 2003297027A JP 2003297027 A JP2003297027 A JP 2003297027A JP 4305833 B2 JP4305833 B2 JP 4305833B2
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- 239000004576 sand Substances 0.000 title claims description 102
- 238000000034 method Methods 0.000 title claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 110
- 239000002245 particle Substances 0.000 claims description 33
- 239000010419 fine particle Substances 0.000 claims description 32
- 230000008929 regeneration Effects 0.000 claims description 18
- 238000011069 regeneration method Methods 0.000 claims description 18
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 17
- 229910052863 mullite Inorganic materials 0.000 claims description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 230000001172 regenerating effect Effects 0.000 claims description 6
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 229910052609 olivine Inorganic materials 0.000 claims description 5
- 239000010450 olivine Substances 0.000 claims description 5
- -1 steatite Inorganic materials 0.000 claims description 5
- 229910052845 zircon Inorganic materials 0.000 claims description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000002923 metal particle Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000003110 molding sand Substances 0.000 description 11
- 239000011230 binding agent Substances 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 10
- 238000005498 polishing Methods 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 230000005484 gravity Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004503 fine granule Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
本発明は、機械式再生装置を用いて、回収された鋳型砂を再生する方法に関する。 The present invention relates to a method for reclaiming recovered mold sand using a mechanical regenerator.
従来、鋳型砂を回収し、表面に付着した粘結剤を除去する再生処理を行った上で再度鋳型砂として使用することは公知であり、そのための方法も多数公知となっている。その方法には、機械式再生装置を用い砂粒子間相互の摩擦のみで再生する方法や機械式再生装置を用い砂粒子間相互の摩擦に加えて砂粒子に押圧することでより強固に再生する方法がある。 Conventionally, it is publicly known to recover mold sand and re-use it as mold sand after performing a regeneration treatment for removing the binder adhering to the surface, and many methods for that purpose are also known. The method uses a mechanical regenerator to regenerate only by friction between sand particles, or a mechanical regenerator to regenerate more firmly by pressing against sand particles in addition to the friction between sand particles. There is a way.
これら技術を用いることで、従来の機械式再生装置よりも鋳型砂の再生技術は向上してきているが、近年耐破砕性などを目的に誕生しているアルミナ、ムライト、ステアタイト、アルミナシリケートのうち少なくとも一つを主成分として人工的に作られた鋳型砂においては再生砂の品質は従来よりもさらに高いものが要求されている。そこで、機械式砂再生装置を用いた鋳型砂の再生において、高いコストを掛けることなく前述のような砂が高品質に再生できるよう、さらなる技術改良が求められている。 By using these technologies, the technology for reclaiming mold sand has been improved compared to conventional mechanical regenerators, but among the alumina, mullite, steatite, and alumina silicates that have been born in recent years for purposes such as crush resistance. In the molding sand artificially made with at least one as a main component, the quality of reclaimed sand is required to be higher than before. Therefore, in the regeneration of the mold sand using the mechanical sand regenerator, further technical improvement is required so that the above-mentioned sand can be regenerated with high quality without incurring high costs.
この要求を満たすために、例えば、高速回転するロータ内に鋳型砂を投入し、ロータ上方にある移動リングを用いてローラを封印し、鋳型砂の漏出を防止することで鋳型砂を所定時間ロータ内に滞留し続けた状態で砂粒子相互間の摩擦作用により付着粘結剤を剥離する作用を持った鋳型砂再生装置が公知となっている（特許文献１参照）。 In order to satisfy this requirement, for example, the molding sand is put into a rotor that rotates at high speed, the roller is sealed using a moving ring above the rotor, and the molding sand is prevented from leaking for a predetermined time. A mold sand reclaiming device has been known which has an action of peeling the adhering binder by a frictional action between sand particles while staying in the sand (see Patent Document 1).
さらに、処理する粒状物の装入空間の内部に、砥粒によって製造した研磨ヘッドをその回転軸をほぼ水平姿勢として回転駆動可能に配置し、研磨ヘッドの外周面との間に隙間を持たせて半径方向に延びる複数の翼を放射状に配列した回転ドラムを研磨ヘッド周りにほぼ同軸上で回転可能に配置したことを特徴とする粒状物の表面研磨装置が公知となっている（特許文献２参照）。 In addition, a polishing head manufactured from abrasive grains is disposed in the space for charging the granular material to be processed so that the rotating shaft can be driven to rotate in a substantially horizontal posture, and a gap is provided between the polishing head and the outer peripheral surface of the polishing head. A granular surface polishing apparatus is known in which a rotating drum in which a plurality of blades extending in the radial direction are arranged radially is arranged around a polishing head so as to be substantially coaxially rotatable (Patent Document 2). reference).
また、鋳造後回収された球形ムライト砂を流動層式乾燥機に掛けて乾燥球形ムライト砂にした後、粒子間摩擦式再生機に投入して砂再生をする球形ムライト砂の再生方法であって、粒子間摩擦式再生機へ乾燥球形ムライト砂を投入すると同時に研磨剤として球形ムライト砂の粒径よりも小さい粒径のセラミックス粉を乾燥球形ムライト砂に対して０．０１〜１０重量％投入して球形ムライト砂の再生を促進させ、再生機に掛けられて処理されたものから球形ムライト再生砂と研磨剤とに分離させ、分離された研磨剤を流動層式焙焼炉に掛けて研磨剤の表面に強固に付着された粘結剤を加熱燃焼させ、燃焼させた研磨剤をセパレータに掛けて燃焼物と研磨剤とに分離することを特徴とする球形ムライト砂の再生方法が一つの方法として提案されている（特許文献３参照）。
しかしながら、この技術には以下に示すような大きな問題が存在している。まず、特許文献１に示す方法では、再生を行う際に砂粒子同士が激しく摩擦するために、砂表面に付着した粘結剤が剥離するのみならず砂粒子自体が研磨されることにより、多量の廃棄物を排出するとともに鋳型砂の再生に伴う回収率、即ち歩留まりが著しく低下するという問題があった。
また、再生のために時には鋳型砂が数分間にわたって装置内で摩擦を起こすために、装置が激しく発熱をしたり、装置内の部品の摩耗が非常に短期間で進んだりといった問題があった。
However, this technology has the following major problems. First, in the method shown in Patent Document 1, since sand particles rub against each other when regenerating, not only the binder adhering to the sand surface is peeled but also the sand particles themselves are polished. However, there was a problem that the recovery rate, i.e., the yield, due to the regeneration of the mold sand was significantly reduced.
In addition, since the molding sand sometimes causes friction in the apparatus for several minutes for the regeneration, there is a problem that the apparatus generates a large amount of heat and wear of parts in the apparatus proceeds in a very short period of time.
また、特許文献２に示す方法では研磨ヘッド内に剥離した粘結剤が侵入して研磨ヘッドの砥石としての能力が急激に低下するとともに研磨ヘッドの摩耗が起こると砂再生能力が著しく低下するために、頻繁に研磨ヘッドを交換せねばならず、交換に伴う設備稼働率の低下、ならびに研磨ヘッドが高価であることや交換に長時間を要することによる高コストの問題が大きかった。 Further, in the method shown in Patent Document 2, the ability of the polishing head as a grindstone to sharply decrease due to penetration of the binder that has peeled into the polishing head, and when the polishing head wears, the sand regeneration capability is significantly reduced. In addition, the polishing head must be frequently replaced, and the equipment operation rate is reduced due to the replacement, and the problem of high cost due to the high cost of the polishing head and the long time required for replacement is significant.
さらに、特許文献３に示す方法では研磨剤として７０〜５μｍのセラミック粉を使用し、セラミック粉を乾燥球形ムライト砂に０．０１〜１０重量％添加して粒子間摩擦式再生機で再生処理し、再生砂と研磨剤とに分離し、研磨剤を流動焙焼炉により３００〜１０００℃に加熱し、その後加熱によって生じた燃焼物と研磨剤とを分離するとある。
ここで研磨剤を加熱燃焼させることは全く鋳型砂の再生自体には寄与しないものであり、設備の追加や投入エネルギに伴うコストの増加が問題である。また、粘結剤を燃焼することに伴う環境負荷の問題がある。加えて、研磨剤として粒径７０〜５μｍのアルミナ、ムライト、あるいはアランダム質のセラミック粉を使用するとあるが、セラミック粉を添加し、更に取り除くことによるコスト発生も問題である。
さらに、鋳型砂に添加したセラミック粉は本技術において鋳型砂として使用されているムライトと比重が近似しており、かつ、鋳型砂の一部分と粒径が近似している。本技術で規定されている粒径の粒体はそれが鋳型砂であるかセラミック粉であるかにかかわらず、鋳型に対してはガス欠陥や鋳型強度低下など鋳型の品質を低下する要因となるので本来は完全に除去されるのが望ましい。しかしながら、仮に鋳型砂からこれら粒径の粒体が全て取り除かれたとしても、その中に含まれる鋳型砂とセラミック粉の分級は前述の通り比重が近似しているために非常に難しい。このような問題により、本技術を用いて機械式砂再生装置で高品質の鋳型砂再生を行うのは非常に難しい状況であった。
Furthermore, in the method shown in Patent Document 3, 70 to 5 μm ceramic powder is used as an abrasive, and the ceramic powder is added to dry spherical mullite sand in an amount of 0.01 to 10% by weight and regenerated by an interparticle friction regenerator. In some cases, the sand is separated into regenerated sand and an abrasive, and the abrasive is heated to 300 to 1000 ° C. in a fluid roasting furnace, and then the combustion product and the abrasive generated by the heating are separated.
Here, heating and burning the abrasive does not contribute at all to the regeneration of the mold sand itself, and there is a problem of cost increase due to addition of equipment and input energy. In addition, there is a problem of environmental burden associated with burning the binder. In addition, alumina, mullite, or alundum ceramic powder having a particle diameter of 70 to 5 μm is used as an abrasive, but there is also a problem of cost generation by adding and removing the ceramic powder.
Furthermore, the ceramic powder added to the molding sand has a specific gravity similar to that of mullite used as the molding sand in the present technology, and a particle size is similar to a part of the molding sand. Regardless of whether it is mold sand or ceramic powder, particles with a particle size specified by this technology can cause mold deterioration such as gas defects and mold strength reduction. Therefore, it is desirable that it should be completely removed. However, even if all particles having these particle diameters are removed from the mold sand, classification of the mold sand and ceramic powder contained therein is very difficult because the specific gravity is similar as described above. Due to such problems, it has been very difficult to perform high-quality molding sand regeneration using a mechanical sand recycling apparatus using this technology.
本発明は、上記の問題に鑑みて成されたもので、鋳型砂を安価に処理可能で、歩留まりが高く、研磨剤と剥離粘結剤との分離に焙焼を使用せず、かつ、高価なセラミック粉を使用することなく機械式砂再生装置で鋳型砂の再生を行う方法を提供することを目的とする。 The present invention has been made in view of the above problems, can process the molding sand at a low cost, has a high yield, does not use roasting to separate the abrasive and the release binder, and is expensive. An object of the present invention is to provide a method for regenerating mold sand using a mechanical sand regenerator without using any ceramic powder.
上記の目的を達成するために本発明における機械式再生装置を使用した鋳型砂の再生方法は、鋳造後回収された鋳型砂を、機械式再生装置を用いて再生する方法において、鋳型砂の中に微細粒体を添加した後に再生することを特徴とする。
さらに、前記鋳型砂の主成分がアルミナ、ムライト、ステアタイト、アルミナシリケートのうち少なくとも一つからなることを特徴とする。
また、前記微細粒体が珪砂、ジルコン砂、クロマイト砂、オリビン砂又は鉄を主成分とする金属粒であることを特徴とする。
さらに、前記微細粒体の粒径は５μｍ〜５０μｍであることを特徴とする。
また、前記微細粒体の前記鋳型砂への添加割合が１〜１０質量％の範囲内であることを特徴とする。
さらに、前記鋳型砂は、その主成分がアルミナ、ムライト、ステアタイト、アルミナシリケートのうち少なくとも一つからなり、前記微細粒体は、その粒径が５μｍ〜５０μｍであり、その主成分が、珪砂、ジルコン砂、クロマイト砂、オリビン砂若しくは鉄を主成分とする金属粒からなり、該微細粒体を前記鋳型砂に対し１〜１０質量％の割合で添加した後に再生を行うことを特徴とする。
また、再生処理中の前記機械式再生装置における回転ドラムの回転数が４００ｒｐｍ〜３０００ｒｐｍであることを特徴とする。
In order to achieve the above object, a method for reclaiming mold sand using a mechanical regenerator according to the present invention is a method for regenerating mold sand recovered after casting using a mechanical regenerator. It is characterized by being regenerated after adding fine particles to.
Further, the main component of the mold sand is at least one of alumina, mullite, steatite, and alumina silicate.
The fine particles are silica particles, zircon sand, chromite sand, olivine sand, or metal particles containing iron as a main component.
Further, the fine particles have a particle size of 5 μm to 50 μm.
Further, the addition ratio of the fine particles to the mold sand is in the range of 1 to 10% by mass.
Further, the mold sand is composed mainly of at least one of alumina, mullite, steatite, and alumina silicate. The fine particles have a particle size of 5 μm to 50 μm, and the main component is silica sand. It consists of metal grains mainly composed of zircon sand, chromite sand, olivine sand or iron, and is regenerated after adding the fine particles at a ratio of 1 to 10% by mass with respect to the mold sand. .
Further, the rotational speed of the rotary drum in the mechanical playback device during the playback process is 400 rpm to 3000 rpm.
上記の説明から明らかなように、本発明は鋳造後回収された鋳型砂を、機械式再生装置を用いて再生する方法において、鋳型砂の中に微細粒体を添加した後に再生するようにしたため、主成分がアルミナ、ムライト、ステアタイト、アルミナシリケートからなる高度な再生能力を要求される鋳型砂においても巨大な設備や複雑な工程を用いることなく再生が行えるようになり、産業界に与える効果は著大である。 As is apparent from the above description, the present invention recycles the mold sand recovered after casting using a mechanical regenerator so that it is regenerated after adding fine particles to the mold sand. In addition, it is possible to regenerate without using huge equipment and complicated processes even for mold sands that require high regenerative capacity, consisting mainly of alumina, mullite, steatite, and alumina silicate. Is enormous.
ここで、本発明において、微細粒体を鋳型砂の中に添加することの理由は、機械式再生装置を用いて鋳型砂を再生する際に、本発明において規定しているアルミナ、ムライト、ステアタイト、アルミナシリケートのうち少なくとも一つを主成分とする鋳型砂においては表面が硬く、かつ、形状が非常に球形に近いために、摩擦抵抗が小さくなる。そのため、再生のために負荷した動力の効率が低下するので、摩擦抵抗を増加させるために微細粒体を添加するものである。従って、使用する微細粒体は動摩擦係数が大きいか、もしくはその形状が多角形であることが望ましい。 Here, in the present invention, the reason for adding the fine particles to the mold sand is that when the mold sand is regenerated using a mechanical regenerator, the alumina, mullite, and steer defined in the present invention are used. In the molding sand mainly composed of at least one of tight and alumina silicate, the surface is hard and the shape is very spherical. For this reason, the efficiency of the power loaded for regeneration is lowered, so that fine particles are added to increase the frictional resistance. Therefore, it is desirable that the fine particles to be used have a large dynamic friction coefficient or a polygonal shape.
また、本発明において、微細粒体が鉄を主成分とする金属粒である場合には、材料特性が本発明の要求に合致し、かつ、安価に製造が出来、更に再使用が容易であるという利点がある。 Further, in the present invention, when the fine particles are metal particles mainly composed of iron, the material characteristics meet the requirements of the present invention, can be manufactured at a low cost, and can be easily reused. There is an advantage.
また、本発明において、微細粒体が珪砂、ジルコン砂、クロマイト砂、オリビン砂のいずれかである場合には、形状が多角形であり、安価であり、かつ入手が容易であるという利点がある。 Further, in the present invention, when the fine particles are any one of silica sand, zircon sand, chromite sand, and olivine sand, there is an advantage that the shape is polygonal, inexpensive, and easy to obtain. .
本発明において、微細粒体の粒径が５μｍ未満である場合には大量に微細粒体を投入しないと再生時に鋳型砂の摩擦抵抗が増大しないために非効率、非経済的となり、また５０μｍよりも大きい場合には、鋳型砂の粒径と微細粒体の粒径が近いために砂粒同士の間隙に微細粒体が侵入しづらくなり、結果として摩擦抵抗増大の効果が少なくなるために、本発明における微細粒体の粒径は５μｍ〜５０μｍであることが望ましい。 In the present invention, when the particle size of the fine particles is less than 5 μm, if the fine particles are not added in a large amount, the frictional resistance of the molding sand does not increase at the time of regeneration, which is inefficient and uneconomical. If the particle size is too large, the particle size of the mold sand is close to the particle size of the fine particles, so that it is difficult for the fine particles to enter the gap between the sand particles, and as a result, the effect of increasing the frictional resistance is reduced. The particle size of the fine particles in the invention is preferably 5 μm to 50 μm.
また、本発明において、微細粒体の鋳型砂への添加割合が１質量％未満である場合には添加割合が少なすぎて微細粒体添加の効果が得られず、１０質量％を越える場合にはそれ以上添加量を増やしても効果の増大が認められないため、微細粒体の鋳型砂への添加割合は１〜１０質量％であることが必要である。 In the present invention, when the addition ratio of the fine particles to the mold sand is less than 1% by mass, the addition ratio is too small to obtain the effect of addition of the fine particles, and when the addition rate exceeds 10% by mass. Since the increase of the effect is not recognized even if the amount added is further increased, the addition ratio of the fine particles to the mold sand needs to be 1 to 10% by mass.
さらに、本発明における機械式再生装置において、回転ドラムの回転数が４００ｒｐｍ未満であるときは十分な再生効果が得られず、反対に３０００ｒｐｍを越えると再生効率の向上よりも装置の発熱や部品の消耗の方が著しくなるので、回転ドラムの回転数は４００〜３０００ｒｐｍであることが必要である。 Furthermore, in the mechanical reproduction apparatus according to the present invention, when the rotational speed of the rotating drum is less than 400 rpm, a sufficient reproduction effect cannot be obtained. Since the wear becomes more significant, the rotational speed of the rotating drum needs to be 400 to 3000 rpm.
以下、図面に基づき発明を説明する。図１は、本発明の実施例に用いる砂再生工程のフローチャートである。以下、このフローチャートを用いた場合の工程について説明する。
まず、再生しようとする鋳型砂に微細粒体を添加する。この時、該微細粒体は該鋳型砂全体に均等に添加されるのが望ましい。均等に添加するためには、振動フィーダ上で鋳型砂を搬送しながら微細粒体を定量添加するなど、公知の方法を使用して行えばよい。
The invention will be described below with reference to the drawings. FIG. 1 is a flowchart of a sand regeneration process used in an embodiment of the present invention. Hereafter, the process at the time of using this flowchart is demonstrated.
First, fine particles are added to the mold sand to be regenerated. At this time, it is desirable that the fine particles are uniformly added to the entire mold sand. In order to add uniformly, what is necessary is just to perform using a well-known method, such as adding quantitatively a fine granule, conveying mold sand on a vibration feeder.
次に、前記微細粒体を添加した前記鋳型砂を、機械式鋳型砂再生装置を使用して再生する。回転ドラムを水平回転させた状態で鋳型砂を供給する。この状態で該鋳型砂は、砂粒子間相互の摩擦作用により砂粒子表面に付着した粘結剤が剥離されるが、鋳型砂に添加した該微細粒子により砂粒子乾燥後の摩擦係数がより高められる効果があるので、添加しない場合と比較してより強力に粘結剤の剥離を行うことが出来る。
この時、特公昭５７−４２４１１号公報に示すような機械式再生装置を用い砂粒子間相互の摩擦のみで再生を行っても良いし、特許第３１２５２７２号公報に示すような機械式再生装置を用い砂粒子間相互の摩擦に加えて砂粒子に押圧することでより強固に再生を行っても良い。
Next, the mold sand to which the fine particles have been added is regenerated using a mechanical mold sand regenerator. Mold sand is supplied with the rotating drum rotated horizontally. In this state, the mold sand peels off the binder adhering to the surface of the sand particles due to the friction between the sand particles, but the fine particles added to the mold sand further increase the coefficient of friction after drying the sand particles. Therefore, the binder can be peeled off more strongly than when it is not added.
At this time, regeneration may be performed only by friction between sand particles using a mechanical regeneration device as shown in Japanese Patent Publication No. 57-42411, or a mechanical regeneration device as shown in Japanese Patent No. 3125272. In addition to the friction between the sand particles used, the sand particles may be pressed more firmly to press the sand particles.
再生が終了すると、前記鋳型砂と剥離物、添加した微細粒体の分級を行う。剥離物や前記微細粒体はその粒径が微小であることなどから鋳型砂から完全に除去されることが望ましい。分級の方法としては篩い分けによるもの、比重差を利用したものなど様々なものが公知となっており、これらの方法を使用すればよい。一般的には、該微細粒体として珪砂やオリビン砂を使用したときにはこれら粒体は再生によって更に微細化してしまうので、剥離物とともに比重差を利用した方法などで該鋳型砂から取り除く方法が最も簡便である。一方、ジルコン砂、クロマイト砂、金属粒を利用した方法では、鋳型砂と粒体の比重が非常に近いか、もしくは粒体の比重の方が鋳型砂の比重よりも大きいので、あらかじめ剥離物を鋳型砂から分級しておいた後、鋳型砂と微細粒体とを磁力選別する方法が最も簡便である。この方法による場合は、選別された微細粒体は再度使用が可能である。 When the regeneration is completed, the mold sand, the exfoliated material, and the added fine particles are classified. It is desirable that the exfoliated material and the fine particles are completely removed from the mold sand because the particle size is very small. Various classification methods such as those using sieving and those utilizing the difference in specific gravity are known, and these methods may be used. Generally, when silica sand or olivine sand is used as the fine particles, these particles are further refined by regeneration. Therefore, the most effective method is to remove from the casting sand by using a difference in specific gravity together with the exfoliated material. Convenient. On the other hand, in the method using zircon sand, chromite sand, and metal particles, the specific gravity of the mold sand and the particles is very close, or the specific gravity of the particles is larger than the specific gravity of the mold sand. The simplest method is to magnetically sort the mold sand and fine particles after classification from the mold sand. In the case of this method, the selected fine particles can be used again.
鋳型砂を安価に処理可能で、歩留まりが高く、研磨剤と剥離粘結剤との分離に焙焼を使用せず、かつ、高価なセラミック粉を使用することなく機械式砂再生装置で鋳型砂の再生を行うことができ、産業上の利用の可能性は大である。 Mold sand can be processed at low cost, has a high yield, does not use roasting to separate the abrasive from the release binder, and does not use expensive ceramic powder. The possibility of industrial use is great.
なし
None
Claims (2)
前記鋳型砂は、その主成分がアルミナ、ムライト、ステアタイト、アルミナシリケートのうち少なくとも一つからなり、
前記微細粒体は、その粒径が５μｍ〜５０μｍであり、その主成分が、珪砂、ジルコン砂、クロマイト砂、オリビン砂若しくは鉄を主成分とする金属粒からなり、
該微細粒体を前記鋳型砂に対し１〜１０質量％の割合で添加した後に再生を行うことを特徴とする、機械式再生装置を使用した鋳型砂の再生方法。 In a method of reclaiming mold sand recovered after casting using a mechanical regenerator, and regenerating after adding fine particles to the mold sand,
The mold sand is composed mainly of at least one of alumina, mullite, steatite, alumina silicate,
The fine particles have a particle size of 5 μm to 50 μm, and the main component is composed of metal particles mainly composed of silica sand, zircon sand, chromite sand, olivine sand or iron,
A method for reclaiming mold sand using a mechanical regenerator, wherein the fine particles are regenerated after being added at a ratio of 1 to 10% by mass with respect to the mold sand.
であることを特徴とする、請求項１に記載の機械式再生装置を使用した鋳型砂の再生方法。 The rotational speed of the rotating drum in the mechanical regeneration device during the regeneration process is 400 rpm to 3000 rpm.
The method for reclaiming mold sand using the mechanical regenerator according to claim 1 .
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