JPH0768343A - Production of aluminum alloy casting - Google Patents
Production of aluminum alloy castingInfo
- Publication number
- JPH0768343A JPH0768343A JP18612694A JP18612694A JPH0768343A JP H0768343 A JPH0768343 A JP H0768343A JP 18612694 A JP18612694 A JP 18612694A JP 18612694 A JP18612694 A JP 18612694A JP H0768343 A JPH0768343 A JP H0768343A
- Authority
- JP
- Japan
- Prior art keywords
- core
- mold
- casting
- aluminum alloy
- granular material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、注湯後の崩壊性が良好
な鋳型用組成物を用いて、アルミニウム合金を製造する
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an aluminum alloy using a mold composition having good disintegration after pouring.
【０００２】[0002]
【従来の技術】通常、鋳造に用いる中子は、鋳物砂と有
機粘結剤とから成る鋳型用組成物によって作られている
が、この鋳型用組成物については注湯後において容易に
崩壊することが要求され、そのためにこれまでも多くの
研究がなされている。2. Description of the Related Art Usually, a core used for casting is made of a molding composition composed of foundry sand and an organic binder, and this molding composition easily disintegrates after pouring. Therefore, much research has been done so far.
【０００３】特に、アルミニウム合金の鋳造に際して
は、鉄の場合と異なり、中子中の粘結剤が分解するのに
十分な熱履歴を与えないため、注湯後の中子が崩壊しに
くく、エアハンマーなどで鋳物に大きな衝撃を与えて砂
落しを行うか、あるいは約５００℃の高温下で４〜８時
間加熱処理して砂焼きしなければならず、多大の労力と
エネルギーの消費を必要としていた。ところで、最近の
自動車関連の鋳造部品は、軽量化のために、従来の鉄に
代えてアルミニウム合金を用いる傾向にあり、中子の崩
壊性の向上の問題はいよいよ焦眉の急となってきてい
る。Particularly, when casting an aluminum alloy, unlike the case of iron, since the binder in the core does not give sufficient heat history to decompose, the core after pouring is less likely to collapse, A large impact must be given to the casting with an air hammer etc. to remove the sand, or heat treatment must be performed at a high temperature of about 500 ° C for 4 to 8 hours to burn the sand, which requires a great deal of labor and energy consumption. I was trying. By the way, in recent automobile-related cast parts, there is a tendency to use an aluminum alloy in place of conventional iron in order to reduce the weight, and the problem of improving the disintegration property of the core is becoming more and more urgent. .
【０００４】中子の注湯後の崩壊性を改善する手段の１
つとして、比較的低温で熱分解する物質を配合して粘結
剤の結合力を破壊することが行われ、これまでに、この
ような物質として含ハロゲン有機化合物、過酸化物、リ
ン酸エステル類又は無機塩化物などが提案されている
（特開昭５７−１３９４４２号公報、特開昭５７−１４
９０４３号公報、特開昭５７−１５６８５８号公報、特
開昭５８−３７４５号公報、特開昭５８−２０５６４１
号公報）。A means for improving the disintegration property of cores after pouring
As one of the methods, a substance that thermally decomposes at a relatively low temperature is blended to destroy the binding force of the binder, and as such substances, halogen-containing organic compounds, peroxides, and phosphoric acid esters have been used so far. And inorganic chlorides have been proposed (JP-A-57-139442 and JP-A-57-14).
9043, JP-A-57-156858, JP-A-58-3745, and JP-A-58-205641.
Issue).
【０００５】しかしながら、これらの物質は、粘結剤の
結合力を破壊する性質上、得られる中子の強度が低下す
るのを免れず、このためその配合量にはおのずから限度
があり、十分な崩壊性の向上は望めない。However, these substances are unavoidable in that the strength of the resulting core is deteriorated due to the property of destroying the binding force of the binder, and therefore, the blending amount is naturally limited and sufficient. No improvement in disintegration can be expected.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、注湯後の崩
壊性が優れた鋳型用組成物を用いてアルミニウム合金鋳
物を製造する方法を提供することを目的とするものであ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing an aluminum alloy casting using a mold composition having excellent disintegration after pouring.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、アルミニ
ウム合金からの鋳物に、振動を与えながら砂落しを行う
場合に、振動を迅速に中子全体に伝ぱんさせ、その崩壊
を促進させる方法について鋭意研究を重ねた結果、真比
重３．４以上の耐火性高比重粒状体又はこれを１０重量
％以上含む鋳物砂との混合物から成る鋳型用基材に硬化
性有機粘結剤を配合した鋳型用組成物を用いることによ
りその目的を達成しうることを見出し、この知見に基づ
いて本発明をなすに至った。Means for Solving the Problems The inventors of the present invention rapidly propagate vibrations to the entire core and accelerate the collapse of the castings made of aluminum alloy when sand is removed while applying vibrations. As a result of earnest research on the method, a curable organic binder was added to a mold base material made of a refractory high specific gravity granular material having a true specific gravity of 3.4 or more or a mixture with molding sand containing 10% by weight or more thereof. It was found that the object can be achieved by using the above composition for a mold, and the present invention has been completed based on this finding.
【０００８】すなわち、本発明は、（ａ）真比重３．４
以上の耐火性高比重粒状体又はこれを１０重量％以上含
む鋳物砂との混合物から成る鋳型用基材に硬化性有機粘
結剤を配合して鋳型用組成物を調製する工程、（ｂ）前
記鋳型用組成物で中子を成形する工程、（ｃ）前記中子
を用いてアルミニウム合金鋳物を鋳造する工程、及び
（ｄ）前記アルミニウム合金鋳物に振動を与えて中子を
除去する工程を含むことを特徴とするアルミニウム合金
鋳物の製造方法を提供するものである。That is, according to the present invention, (a) the true specific gravity is 3.4.
(B) a step of preparing a mold composition by blending a curable organic binder into a mold base material made of the above refractory high specific gravity granules or a mixture with molding sand containing 10 wt% or more thereof Molding a core with the mold composition, (c) casting an aluminum alloy casting using the core, and (d) vibrating the aluminum alloy casting to remove the core. The present invention provides a method for producing an aluminum alloy casting, which comprises:
【０００９】本発明方法で用いる鋳型用基材は、全部が
真比重３．４以上の耐火性高比重粒状体から成っていて
もよいし、またこの耐火性高比重粒状体を１０重量％以
上含む鋳物砂との混合物であってもよい。なお、この混
合物中の耐火性高比重粒状体の比率が１０重量％未満で
あると、振動伝ぱん効果が十分に促進されない。The mold base material used in the method of the present invention may be composed entirely of refractory high specific gravity granules having a true specific gravity of 3.4 or more, and the refractory high specific gravity granules of 10% by weight or more. It may be a mixture with foundry sand containing. If the proportion of the refractory high specific gravity granules in this mixture is less than 10% by weight, the vibration propagation effect is not sufficiently promoted.
【００１０】この耐火性高比重粒状体としては、真比重
が３．４以上のものを用いることが必要であり、真比重
３．４未満のものでは、振動を伝ぱんさせる作用が十分
に付加されない。この真比重は高ければ高いほどよい
が、８．０よりも大きな物質は一般にコストの高い貴重
な金属になるため実用的でない。本発明方法において用
いられる耐火性高比重粒状体の具体例としては、ジルコ
ンサンド、クロマイトサンド、転炉風砕スラグ、粒状鉄
などが挙げられ、これらはそれぞれ単独で用いてもよい
し、２種以上組み合わせて用いてもよい。なお、ここに
示す真比重はＪＩＳ−Ｒ−２２０５に準じて測定した値
である。また、この粒状体の粒度分布については特に制
限はないが、２０メッシュふるいを通過しない量が２０
重量％以下で、かつ２７０メッシュふるい通過量が１０
重量％以下であるような粒状体が好適である。As the refractory high specific gravity granular material, it is necessary to use one having a true specific gravity of 3.4 or more. If the true specific gravity is less than 3.4, a function of propagating vibration is sufficiently added. Not done. The higher this true specific gravity is, the better, but a substance larger than 8.0 is generally not practical because it becomes a precious metal with high cost. Specific examples of the refractory high specific gravity granules used in the method of the present invention include zircon sand, chromite sand, converter blast slag, and granular iron. These may be used alone or in combination of two kinds. You may use it in combination of the above. The true specific gravity shown here is a value measured according to JIS-R-2205. The particle size distribution of this granular material is not particularly limited, but the amount that does not pass through a 20-mesh sieve is 20
Weight% or less and a 270 mesh sieve passage amount of 10
Granules with a weight percentage of less than or equal are preferred.
【００１１】この鋳型用基材には、その合計量に対し、
０．１〜１０重量％の硬化性有機粘結剤を添加すること
が必要である。この有機粘結剤としては、通常中子の製
造に際して慣用されている加熱硬化性樹脂（シェルモー
ルド法）、通気硬化性樹脂（コールドボックス法）、常
温自硬化性樹脂（常温硬化法）などであり、例えばシェ
ルモールド法においては、ノボラック型又はレゾール型
フェノール系樹脂、尿素系樹脂など、コールドボックス
法においては、フェノール・イソシアネート系樹脂、フ
ラン系樹脂など、常温硬化法においては、フェノール系
樹脂、フラン系樹脂、フェノール・イソシアネート系樹
脂などが用いられる。また、これらの樹脂に対し、崩壊
性を改善する目的で各種の添加剤、例えば臭素含有有機
化合物や塩素化合物などを反応若しくは混合した変性樹
脂なども用いることができる。This base material for a mold has a total amount of
It is necessary to add 0.1 to 10% by weight of a curable organic binder. Examples of the organic binder include a heat-curable resin (shell mold method), an air-curable resin (cold box method), and a room-temperature self-curing resin (a room-temperature curing method) that are commonly used in the production of cores. There, for example, in shell mold method, novolac type or resol type phenolic resin, urea resin, etc., in cold box method, phenol / isocyanate resin, furan resin, etc., in room temperature curing method, phenolic resin, Furan resins, phenol / isocyanate resins, etc. are used. In addition, modified resins obtained by reacting or mixing various additives such as bromine-containing organic compounds and chlorine compounds with these resins for the purpose of improving disintegration can also be used.
【００１２】本発明方法においては、上記の耐火性高比
重粒状体又はそれを１０重量％以上含む鋳物砂との混合
物から成る鋳型用基材と硬化性有機粘結剤とを、所定の
割合で適当な混練機を用いて混合するか、あるいは鋳物
砂と硬化性有機粘結剤又は耐火性高比重粒状体と硬化性
有機粘結剤とをそれぞれ混練機を用いて別々に混合し、
次いでこれらを所定の割合で配合することにより鋳型用
組成物を調製する。なお、鋳型用基材は前述したような
硬化性有機粘結剤の性質に応じて加熱又は常温の状態で
用いられる。In the method of the present invention, a mold base comprising the above-mentioned refractory high specific gravity granules or a mixture of molding sand containing 10% by weight or more of the granules and a curable organic binder at a predetermined ratio. Mixing using a suitable kneader, or the molding sand and the curable organic binder or the refractory high specific gravity granules and the curable organic binder are separately mixed using a kneader, respectively,
Then, these are mixed in a predetermined ratio to prepare a mold composition. The template substrate is used under heating or at room temperature depending on the properties of the curable organic binder described above.
【００１３】次に、この鋳型用組成物を用いて所望形状
の中子を成形する。このようにして得られた中子は通
常、造型時、搬送時、鋳造時などにおける破壊防止のた
めに、その形状や対象鋳物に応じて一定の強度を保有す
るように鋳型用組成物によって製造され、管理される。
この場合、中子の強度は同一有機粘結剤でも使用される
鋳型用基材の種類や粒度分布によって異なるため、一般
的には該有機粘結剤の添加量によって調整される。Next, a core having a desired shape is molded using this mold composition. The core thus obtained is usually produced by a mold composition so as to have a certain strength according to its shape and target casting, in order to prevent breakage during molding, transportation, casting, etc. Be managed.
In this case, the strength of the core varies depending on the type of the base material for the mold used and the particle size distribution even with the same organic binder, and thus is generally adjusted by the addition amount of the organic binder.
【００１４】本発明方法においては、このようにして成
形した中子を、例えば金型、砂型等の外型の中にセット
し、両者の間に形成された空隙にあらかじめ所望の温度
で溶融させたアルミニウム合金を注湯し、これを冷却凝
固させて中子を内部に有するアルミニウム合金鋳物を作
製する。次いで、この鋳物に、例えばエアハンマーなど
で外部から振動を与えると、容易に中子が崩壊し、これ
を除去して中空鋳物を得ることができる。In the method of the present invention, the core thus formed is set in an outer mold such as a mold or a sand mold, and is melted at a desired temperature in a space formed between the mold and the mold. Then, the aluminum alloy is poured and cooled and solidified to produce an aluminum alloy casting having a core inside. Next, when this casting is externally vibrated by, for example, an air hammer, the core easily collapses, and this can be removed to obtain a hollow casting.
【００１５】このようにして、従来の鋳型組成物を用い
た場合に比べ、多くは非常に短い時間で中子を崩壊する
ことができ、作業時間を著しく短縮することができる。In this way, the core can be disintegrated in a very short time, and the working time can be remarkably shortened, as compared with the case of using the conventional template composition.
【００１６】[0016]
【発明の効果】本発明方法は、鋳型用基材として真比重
３．４以上の耐火性高比重粒状体単独若しくはこれと鋳
物砂との混合物を用いたものであって、これから得られ
た中子は、アルミニウム合金などの注湯後における崩壊
性が従来のものに比べて大幅に改善され、その崩壊に要
する時間が著しく短縮される。したがって、本発明方法
によれば、生産効率が上がり生産性を著しく向上させる
ことができ、その上低いノックアウト圧で容易に砂落し
をしうるので、鋳物の破壊が少なく製品歩留りが向上
し、さらに熱処理時間の短縮による省エネルギーや、ノ
ックアウト時の手作業の軽減による省力化が可能とな
る。INDUSTRIAL APPLICABILITY The method of the present invention uses a refractory high specific gravity granular material having a true specific gravity of 3.4 or more alone or a mixture thereof with molding sand as a base material for a mold. The child has a significantly improved disintegration property after pouring an aluminum alloy or the like as compared with the conventional one, and the time required for the disintegration is significantly shortened. Therefore, according to the method of the present invention, the production efficiency can be significantly improved and the productivity can be remarkably improved, and since the sand can be easily shredded at a low knockout pressure, the product yield is improved with less breakage of the casting, and Energy can be saved by shortening the heat treatment time, and labor can be saved by reducing manual work during knockout.
【００１７】[0017]
【実施例】次に、実施例により本発明をさらに詳細に説
明する。なお、各例中の鋳型用組成物の曲げ強度及び中
子の崩壊時間は次のようにして測定したものである。EXAMPLES Next, the present invention will be described in more detail by way of examples. The bending strength and core disintegration time of the mold composition in each example are measured as follows.
【００１８】（１）曲げ強度；ＪＩＳＫ６９１０に準じ
た方法により測定した。 （２）崩壊時間；鋳造後得られた鋳物の１か所にエアー
圧力０．４ｋｇ／ｃｍ2のエアハンマーで振動を与えて
鋳物の径１０ｍｍの出口により中子が完全に排出される
までの時間を測定した。 また、各例において用いた鋳型用基材の粒度分布を表１
に示す。(1) Bending strength: Measured by a method according to JIS K6910. (2) Disintegration time; until one core of the casting obtained after casting is vibrated by an air hammer with an air pressure of 0.4 kg / cm 2 until the core is completely discharged by the outlet with a diameter of 10 mm of the casting The time was measured. In addition, the particle size distribution of the template base material used in each example is shown in Table 1.
Shown in.
【００１９】[0019]
【表１】 [Table 1]
【００２０】実施例１〜４ 鋳型用基材として、表１に示す耐火性高比重粒状体５０
００重量部を用い、ヒーターによって１４０〜１５０℃
に加熱してスピードミキサー（遠州鉄工社製）に投入
し、次いでただちに、ほぼ一定の中子の強度を得るため
の粘結剤として表２に示すような所定量のノボラック型
フェノール樹脂［旭有機材工業（株）製、ＳＰ６９０］
を投入し、ミキサー中で５０秒間混練して該樹脂で該粒
状体を被覆したのち、鋳型用基材に対し冷却水１．５重
量％と該樹脂に対しヘキサメチレンテトラミン１５重量
％とを水溶液として投入し、約４０〜６０秒後に内容物
が乾体自由流動体になったところで、鋳型用基材に対し
て滑剤としてステアリン酸カルシウム０．１重量％を投
入して、さらに１５秒間混練後にミキサーから取り出
し、流動性に富んだ加熱硬化性の鋳型用組成物を調製し
た。Examples 1 to 4 The refractory high specific gravity granules 50 shown in Table 1 were used as the mold base material.
00 to 100 parts by weight, 140 to 150 ° C by a heater
The mixture is heated into a speed mixer (manufactured by Enshu Iron Works Co., Ltd.), and immediately thereafter, a predetermined amount of a novolac-type phenol resin [Asahi] is used as a binder for obtaining an almost constant core strength. Machinery Industry Co., Ltd., SP690]
, And kneading in a mixer for 50 seconds to coat the granular material with the resin, and then 1.5% by weight of cooling water to the base material for the mold and 15% by weight of hexamethylenetetramine to the resin in an aqueous solution. When about 40 to 60 seconds later, when the content became a dry body free-flowing substance, 0.1% by weight of calcium stearate was added as a lubricant to the base material for the mold, and the mixture was further kneaded for 15 seconds. Then, a thermosetting mold composition having a high fluidity was prepared.
【００２１】このようにして得た鋳型用組成物を用い
て、ドックボーン型中子（巾４０ｍｍ、長さ７５ｍｍ、
厚さ２５ｍｍ）を作成し、一方、別に前記中子より少し
大きい寸法を有する外型を他の砂型で成形して、その中
に前記中子をセットし、次いで７２０±５℃に溶融した
アルミニウム合金を注湯する。冷却後、鋳物の１か所に
エアー圧力０．４ｋｇ／ｃｍ2のエアハンマーで振動を
与えて中子を崩壊し、これを鋳物から除去して中空鋳物
を得た。この際の鋳型用組成物の曲げ強度及び中子の崩
壊時間を表２に示す。Using the mold composition thus obtained, a dockbone type core (width 40 mm, length 75 mm,
(Thickness 25 mm), on the other hand, an outer mold having a size slightly larger than the core is separately molded with another sand mold, the core is set therein, and then aluminum melted at 720 ± 5 ° C. Pour the alloy. After cooling, one part of the casting was vibrated with an air hammer having an air pressure of 0.4 kg / cm 2 to collapse the core, and this was removed from the casting to obtain a hollow casting. Table 2 shows the bending strength and core disintegration time of the mold composition at this time.
【００２２】実施例５，６ 鋳型用基材として、耐火性高比重粒状体を単独で用いる
代りに、表１に示すような鋳物砂と耐火性高比重粒状体
との混合物を用いる以外は、実施例１〜４と同様な方法
でアルミニウム合金の鋳物を製造した。この際の鋳型用
組成物の曲げ強度及び中子の崩壊時間を表２に示す。Examples 5, 6 As a base material for a mold, instead of using the refractory high specific gravity granules alone, a mixture of foundry sand and refractory high specific gravity granules as shown in Table 1 was used. Aluminum alloy castings were manufactured in the same manner as in Examples 1 to 4. Table 2 shows the bending strength and core disintegration time of the mold composition at this time.
【００２３】実施例７ 耐火性高比重粒状体の代りに鋳物砂（三河６号ケイ砂）
を用いる以外は、実施例１〜４と同様な方法で１．２重
量％のノボラック型フェノール樹脂を使用した樹脂被覆
鋳物砂Ａを得た。一方、前記と同様にして、耐火性高比
重粒状体（ジルコンサンド）と１．２重量％のノボラッ
ク型フェノール樹脂を使用した樹脂被覆耐火性高比重粒
状体Ｂを得た。次に、このようにして得られたＡとＢと
を重量比５０：５０の割合で混合して加熱硬化性の鋳型
用組成物を調製した。この鋳型用組成物を用い、実施例
１〜４と同様にしてアルミニウム合金の鋳物を製造し
た。この際の鋳型用組成物の曲げ強度及び中子の崩壊時
間を表２に示す。Example 7 Casting sand (Mikawa No. 6 silica sand) was used instead of the refractory high specific gravity granular material.
Resin coating molding sand A using 1.2% by weight of novolac type phenolic resin was obtained in the same manner as in Examples 1 to 4 except that On the other hand, in the same manner as above, a resin-coated fire-resistant high-specific-gravity granular material B using a fire-resistant high-specific-gravity granular material (zircon sand) and 1.2% by weight of a novolac type phenol resin was obtained. Next, A and B thus obtained were mixed at a weight ratio of 50:50 to prepare a heat-curable mold composition. Using this mold composition, aluminum alloy castings were produced in the same manner as in Examples 1 to 4. Table 2 shows the bending strength and core disintegration time of the mold composition at this time.
【００２４】比較例１，２ 鋳型用基材として、耐火性高比重粒状体の代りに表２に
示す鋳物砂を用いる以外は、実施例１〜４と同様にして
加熱硬化性の鋳型用組成物を調製し、この鋳型用組成物
を用いて、アルミニウム合金の鋳物を製造した。この際
の鋳型用組成物の曲げ強度及び中子の崩壊時間を表２に
示す。Comparative Examples 1 and 2 A heat-curable mold composition was prepared in the same manner as in Examples 1 to 4 except that the molding sand shown in Table 2 was used as the mold base material instead of the refractory high specific gravity granules. A casting of an aluminum alloy was manufactured using the composition for a mold. Table 2 shows the bending strength and core disintegration time of the mold composition at this time.
【００２５】[0025]
【表２】 [Table 2]
【００２６】表２から明らかなように、本発明方法によ
れば、従来方法に比べて、崩壊時間が大幅に短縮されて
おり、崩壊性が著しく向上していることが分る。As is clear from Table 2, the disintegration time is remarkably shortened and the disintegration property is remarkably improved by the method of the present invention as compared with the conventional method.
【００２７】実施例８ 鋳型用基材として、表１に示すようなジルコンサンド２
５００重量部を用い、卓上ミキサー（品川工業社製）に
投入し、次いでただちに、ほぼ一定の中子の強度を得る
ための粘結剤として表３に示すような所定量のフェノー
ル樹脂［旭有機材工業（株）製、ＡＰ−Ｐ２００］及び
硬化促進剤［旭有機材工業（株）製 ＵＡ］を投入して
ミキサー中で３０秒間混練後、ポリイソシアネート［旭
有機材工業（株）製、ＡＰ−Ｍ７５０］を投入し、さら
に３０秒間混練したのち、ミキサーから取り出して常温
自硬性の鋳型用組成物を調製した。Example 8 Zircon sand 2 as shown in Table 1 was used as a mold base material.
Using 500 parts by weight, the mixture was put into a tabletop mixer (manufactured by Shinagawa Kogyo Co., Ltd.), and immediately after that, a predetermined amount of a phenol resin [Asahi] was used as a binder for obtaining a substantially constant core strength. Kikiki Kogyo Co., Ltd., AP-P200] and a curing accelerator [UA, Asahi Organic Material Co., Ltd.] were added and kneaded in a mixer for 30 seconds, and then polyisocyanate [Asahi Organic Material Co., Ltd., [AP-M750] was added, and the mixture was further kneaded for 30 seconds and then taken out from the mixer to prepare a room-temperature self-hardening mold composition.
【００２８】このようにして得た鋳型用組成物を用い、
実施例１〜４と同様の中子を作成し、アルミニウム合金
を鋳造した。上記の中子についての崩壊時間及び鋳型用
組成物を径５０ｍｍ、高さ５０ｍｍの木型に手込めし
て、２４時間後に測定した圧縮強度を表３に示す。Using the mold composition thus obtained,
Cores similar to those in Examples 1 to 4 were prepared and aluminum alloys were cast. Table 3 shows the disintegration time of the above core and the compressive strength measured 24 hours after the composition for a mold was handed into a wooden mold having a diameter of 50 mm and a height of 50 mm.
【００２９】実施例９ 鋳型用基材として、ジルコンサンドの代りにジルコンサ
ンドと鋳物砂との混合物を用いる以外は、実施例８と同
様にして常温自硬性の鋳型用組成物を調製するととも
に、その鋳型の圧縮強度を測定した。次に、この鋳型用
組成物を用いて、実施例１〜４と同様の中子を作成して
アルミニウム合金を鋳造した。上記の中子についての崩
壊時間と鋳型用組成物の圧縮強度を表３に示す。Example 9 A room temperature self-hardening mold composition was prepared in the same manner as in Example 8 except that a mixture of zircon sand and foundry sand was used as the mold base material instead of zircon sand. The compressive strength of the mold was measured. Next, using this mold composition, cores similar to those in Examples 1 to 4 were prepared and aluminum alloys were cast. Table 3 shows the disintegration time and the compressive strength of the mold composition for the above cores.
【００３０】比較例３，４ 鋳型用基材として、ジルコンサンドの代りに鋳物砂を用
いる以外は、実施例８と同様にして常温自硬性の鋳型用
組成物を調製するとともに、その鋳型の圧縮強度を測定
した。次に、この鋳型用組成物を用いて、実施例１〜４
と同様の中子を作成し、アルミニウム合金の鋳造を行っ
た。この際の、中子の崩壊時間及び鋳型用組成物の圧縮
強度を表３に示す。Comparative Examples 3 and 4 A room temperature self-hardening mold composition was prepared in the same manner as in Example 8 except that molding sand was used instead of zircon sand as the mold base material, and the mold was compressed. The strength was measured. Next, using this mold composition, Examples 1 to 4 were prepared.
A core similar to that was prepared and an aluminum alloy was cast. Table 3 shows the core disintegration time and the compressive strength of the mold composition at this time.
【００３１】[0031]
【表３】 [Table 3]
【００３２】実施例１１ 鋳型用基材として、表１に示すジルコンサンド２５００
重量部を用い、卓上ミキサー（品川工業社製）に投入
し、次いでただちに、ほぼ一定の中子の強度を得るため
の粘結剤として表４に示すような所定量のフェノール樹
脂［旭有機材工業（株）製、ＣＢ−Ｐ］及びポリイソシ
アネート［旭有機材工業（株）製、ＣＢ−Ｍ］を投入し
て６０秒間混練後、ミキサーから取り出して通気硬化性
の鋳型用組成物を得たのち、トリエチルアミンガスを通
気させて実施例８と同様の鋳型（径５０ｍｍ、高さ５０
ｍｍ）を成形し、鋳型の圧縮強度を測定した。次に、鋳
型用組成物を用いて、実施例１〜４と同様の中子を作成
しアルミニウム合金の鋳造を行った。この際の中子の崩
壊時間及び鋳型用組成物の圧縮強度を表４に示す。Example 11 Zircon sand 2500 shown in Table 1 was used as a template base material.
Part by weight, charged into a desktop mixer (manufactured by Shinagawa Kogyo Co., Ltd.), and immediately thereafter, a predetermined amount of phenol resin [Asahi Organic Material] as a binder for obtaining a substantially constant core strength. CB-P] manufactured by Kogyo Co., Ltd. and polyisocyanate [CB-M manufactured by Asahi Organic Materials Co., Ltd.] are kneaded and kneaded for 60 seconds, and then taken out from the mixer to obtain an air-curable composition for a mold. After that, a mold similar to that in Example 8 (diameter 50 mm, height 50) was prepared by ventilating triethylamine gas.
mm) was molded and the compressive strength of the mold was measured. Next, using the mold composition, cores similar to those in Examples 1 to 4 were prepared and aluminum alloys were cast. Table 4 shows the core disintegration time and the compressive strength of the mold composition.
【００３３】比較例５ 鋳型用基材として、ジルコンサンドの代りにフリーマン
トルサンドを用いる以外は、実施例１１と同様にして通
気硬化性の鋳型用組成物を調製するとともにその鋳型の
圧縮強度を測定した。次に、この鋳型用組成物を用い
て、実施例１〜４と同様の中子を作成してアルミニウム
合金の鋳造を行った。この際の中子の崩壊時間及び鋳型
用組成物の圧縮強度を表４に示す。Comparative Example 5 An air-curable mold composition was prepared in the same manner as in Example 11, except that Fremantle sand was used instead of zircon sand as the mold base material, and the compression strength of the mold was determined. It was measured. Next, using this mold composition, cores similar to those in Examples 1 to 4 were prepared and aluminum alloys were cast. Table 4 shows the core disintegration time and the compressive strength of the mold composition.
【００３４】[0034]
【表４】 [Table 4]
【００３５】比較例６ 鋳型用基材として、真比重３．０６の耐火性高比重粒状
体（フェロクロムスラグ）を用い、粘結剤量を１．５重
量％とする以外は、実施例１〜４と同様にして加熱硬化
性の鋳型用組成物を調製し、その鋳型の曲げ強度を測定
した。次に、この鋳型用組成物を用いて、実施例１〜４
と同様な方法でアルミニウム合金を鋳造した。この際の
鋳型用組成物の曲げ強度３４．２ｋｇ／ｃｍ2、中子の
崩壊時間は１４秒であった。Comparative Example 6 Examples 1 to 3 except that a fire-resistant high-specific-gravity granular material (ferrochrome slag) having a true specific gravity of 3.06 was used as the template base material and the amount of the binder was 1.5% by weight. A heat-curable mold composition was prepared in the same manner as in 4, and the bending strength of the mold was measured. Next, using this mold composition, Examples 1 to 4 were prepared.
An aluminum alloy was cast in the same manner as in. The bending strength of the mold composition at this time was 34.2 kg / cm 2 , and the core disintegration time was 14 seconds.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 為本 和雄 愛知県丹羽郡扶桑町大字南山名字新津26− ４ 旭有機材工業株式会社愛知工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Tamemoto 26-4 Niitsu Niiyama, Fuso-cho, Niwa-gun, Aichi Prefecture Asahi Organic Materials Co., Ltd. Aichi factory
Claims (1)
ミニウム合金鋳物の製造方法。 （ａ）真比重３．４以上の耐火性高比重粒状体又はこれ
を１０重量％以上含む鋳物砂との混合物から成る鋳型用
基材に硬化性有機粘結剤を配合して鋳型用組成物を調製
する工程、 （ｂ）前記鋳型用組成物で中子を成形する工程、 （ｃ）前記中子を用いてアルミニウム合金鋳物を鋳造す
る工程、及び （ｄ）前記アルミニウム合金鋳物に振動を与えて中子を
除去する工程。1. A method for producing an aluminum alloy casting, which comprises the following steps. (A) Molding composition in which a curable organic binder is blended with a molding base material made of a fire-resistant high-specific-gravity granular material having a true specific gravity of 3.4 or more or a mixture with molding sand containing 10% by weight or more of the granular material. (B) molding a core with the composition for a mold, (c) casting an aluminum alloy casting using the core, and (d) applying vibration to the aluminum alloy casting. To remove the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18612694A JPH0768343A (en) | 1994-08-08 | 1994-08-08 | Production of aluminum alloy casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18612694A JPH0768343A (en) | 1994-08-08 | 1994-08-08 | Production of aluminum alloy casting |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9252985A Division JPS61249643A (en) | 1985-04-30 | 1985-04-30 | Composition for casting mold having good collapsing property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0768343A true JPH0768343A (en) | 1995-03-14 |
Family
ID=16182827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18612694A Pending JPH0768343A (en) | 1994-08-08 | 1994-08-08 | Production of aluminum alloy casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0768343A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014077203A1 (en) * | 2012-11-19 | 2014-05-22 | 新東工業株式会社 | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
| CN113646107A (en) * | 2019-03-29 | 2021-11-12 | 旭有机材株式会社 | Mold material composition and method for producing mold using same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139442A (en) * | 1981-02-23 | 1982-08-28 | Asahi Organic Chem Ind Co Ltd | Resin-coated sand grains for forming mold and mold formed of this sand grain |
| JPS57149043A (en) * | 1981-03-09 | 1982-09-14 | Asahi Organic Chem Ind Co Ltd | Shell mold material for light alloy casting and mold molded by heating from this |
-
1994
- 1994-08-08 JP JP18612694A patent/JPH0768343A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57139442A (en) * | 1981-02-23 | 1982-08-28 | Asahi Organic Chem Ind Co Ltd | Resin-coated sand grains for forming mold and mold formed of this sand grain |
| JPS57149043A (en) * | 1981-03-09 | 1982-09-14 | Asahi Organic Chem Ind Co Ltd | Shell mold material for light alloy casting and mold molded by heating from this |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014077203A1 (en) * | 2012-11-19 | 2014-05-22 | 新東工業株式会社 | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
| CN104812509A (en) * | 2012-11-19 | 2015-07-29 | 新东工业株式会社 | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
| JP5972393B2 (en) * | 2012-11-19 | 2016-08-17 | 新東工業株式会社 | Mold sand and molding method of sand mold |
| US9789533B2 (en) | 2012-11-19 | 2017-10-17 | Sintokogio, Ltd. | Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting |
| CN113646107A (en) * | 2019-03-29 | 2021-11-12 | 旭有机材株式会社 | Mold material composition and method for producing mold using same |
| CN113646107B (en) * | 2019-03-29 | 2024-05-03 | 旭有机材株式会社 | Casting material composition and method for producing casting using same |
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