JP3133158B2 - Coating agent for disintegratable core - Google Patents
Coating agent for disintegratable coreInfo
- Publication number
- JP3133158B2 JP3133158B2 JP04183680A JP18368092A JP3133158B2 JP 3133158 B2 JP3133158 B2 JP 3133158B2 JP 04183680 A JP04183680 A JP 04183680A JP 18368092 A JP18368092 A JP 18368092A JP 3133158 B2 JP3133158 B2 JP 3133158B2
- Authority
- JP
- Japan
- Prior art keywords
- coating
- core
- coating agent
- molten metal
- binder
- 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.)
- Expired - Fee Related
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Paints Or Removers (AREA)
- Mold Materials And Core Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ダイカスト鋳造におい
て、製品鋳造後に製品内部から崩壊除去し得るようにし
た崩壊性置中子の表面に塗布される塗型剤に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold wash applied to the surface of a collapsible core which can be disintegrated and removed from the inside of a product after the product is cast in die casting.
【０００２】[0002]
【従来の技術及びその問題点】ダイカスト鋳造に用いる
崩壊性置中子は、製品鋳造後に製品内部から簡単に取り
出すことができる崩壊性は勿論のこと、高速・高圧で射
出される溶湯の圧力を受けても破壊されない耐圧強度が
要求される。そこで、射出充填時の溶湯圧に耐え得る耐
圧強度を付与するべく、崩壊性の良い材料で造型された
置中子の表面に塗型剤を塗布する表面処理が行なわれ
る。2. Description of the Related Art The collapsible core used for die casting has not only the collapsibility that can be easily taken out from the inside of the product after the product is cast, but also the pressure of the molten metal injected at high speed and high pressure. Compressive strength that does not break even when received is required. Therefore, in order to provide a pressure resistance that can withstand the pressure of the molten metal at the time of injection filling, a surface treatment of applying a coating agent to the surface of the placing core molded with a material having good collapsibility is performed.
【０００３】而して、本発明に最も近い塗型剤として
は、特開平２−235562号公報に開示されたものがある。
しかし乍らこの従来の塗型剤では、鋳造圧力 500〜600K
gf／cm2 前後でゲート速度40〜60 m／s 前後の鋳造条件
下で製品を鋳造する高速・高圧ダイカスト鋳造を実施す
ると、塗型膜に溶湯衝突による小さな割れや溶湯の通過
摩擦による剥れが発生して溶湯差し込みが起き易く、そ
の為に、溶湯充填時に中子の一部が破損して成型不良を
起したり、鋳造後の製品内部に塗型残りを引き起こす等
の不具合を有し、崩壊性並びに耐圧強度において満足し
得るものではなかった。[0003] As a coating agent closest to the present invention, there is one disclosed in JP-A-2-235562.
However, with this conventional coating agent, the casting pressure is 500-600K.
When high-speed and high-pressure die casting is performed to cast products under casting conditions of about gf / cm 2 and gate speed of about 40-60 m / s, small cracks due to collision with the molten metal and peeling due to friction of the molten metal passing through the casting mold film. It is easy for molten metal to be inserted due to the occurrence of defects.Therefore, when filling the molten metal, a part of the core is damaged and defective molding is caused, and there is a problem such as causing a coating mold residue inside the product after casting. , Disintegration and compressive strength were not satisfactory.
【０００４】加えて従来の塗型剤では、その粘度がイワ
タ簡易粘度コップで10〜20秒／20℃と低いために、置中
子の表面に塗布した塗型剤が液ダレを生じやすいと同時
に、塗型剤を入れた溶液槽の底に塗型剤の粒子成分が沈
殿しやすく、そのため塗布作業時に塗型剤を常時強力に
撹拌する必要があり、すると塗型剤中に泡が発生して置
中子の表面にきれいに塗布することができず、その結
果、溶湯差し込みの原因となる等の不具合があった。[0004] In addition, the viscosity of the conventional mold wash is as low as 10 to 20 seconds / 20 ° C. in a simple Iwata viscosity cup, so that the mold wash applied to the surface of the placing core tends to cause liquid dripping. At the same time, the particle components of the coating agent tend to settle out at the bottom of the solution tank containing the coating agent, so it is necessary to constantly vigorously stir the coating agent during the coating operation, and bubbles are generated in the coating agent As a result, it could not be applied to the surface of the placing core cleanly, and as a result, there was a problem that the molten metal could be inserted.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこの様な従来
の不具合に鑑みてなされたものであり、高速・高圧ダイ
カスト鋳造を実施した場合でも、置中子表面に形成した
塗型膜が溶湯の衝突による割れや剥れに伴なう溶湯差し
込み等の発生の惧れがない耐圧強度を備え、しかも置中
子表面への塗布性能に極めて優れた塗型剤を提供せんと
するものである。SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. Even when high-speed / high-pressure die casting is performed, the coating film formed on the surface of the placing core is not melted. It is intended to provide a mold wash agent that has pressure-resistant strength that does not cause the occurrence of cracks due to collisions or the insertion of molten metal due to peeling, and that is extremely excellent in coating performance on the surface of the placed core. .
【０００６】[0006]
【課題を達成するための手段】斯る目的を達成する本発
明の崩壊性置中子用塗型剤は、バインダーにフィラーと
少量の添加剤を分散させてなる崩壊性置中子用塗型剤に
おいて、前記バインダーがシラノール基又はアルコキシ
基結合したケイ素原子を１分子中に少なくとも２個有し
且つ110,000 〜700,000 の平均分子量を有する直鎖状オ
ルガノポリシロキサンであることを特徴としたものであ
る。Means for Achieving the Object The present invention provides a disintegrating disposable core coating composition comprising a binder and a small amount of an additive dispersed in a binder. Wherein the binder is a linear organopolysiloxane having at least two silicon atoms bonded to a silanol group or an alkoxy group in one molecule and having an average molecular weight of 110,000 to 700,000. .
【０００７】[0007]
【実施例】本発明に係る塗型剤は、バインダーにフィラ
ーと少量の添加剤を分散させたものに、適量の有機溶剤
を加えてなる。そして、本発明に係るバインダーとして
は、直鎖状で高重合度のオルガノポリシロキサン、詳し
くは、加熱によって架橋反応が進行して弾性性能を与え
る加熱加硫型のジメチル系，メチルビニル系，メチルフ
ェニルビニル系，メチルフルオロアルキル系等の直鎖状
オルガノポリシロキサンを用い、その平均分子量が110,
000 〜700,000 の範囲にあるものが望ましい。平均分子
量が110,000 未満では粘土が低くて乾燥性が悪く、塗型
膜の強度不足になり、また平均分子量が700,000以上で
は架橋密度が極端に高くなるので可溶性が悪く、伸縮し
難くなって塗型膜が硬くて分散性や塗布作業性が悪くな
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The coating agent according to the present invention is obtained by dispersing a filler and a small amount of additives in a binder and adding an appropriate amount of an organic solvent. As the binder according to the present invention, a linear, high-polymerization organopolysiloxane, more specifically, a heat-curable dimethyl-based, methylvinyl-based, methyl A linear organopolysiloxane such as phenylvinyl or methylfluoroalkyl is used and has an average molecular weight of 110,
Those in the range of 000 to 700,000 are desirable. If the average molecular weight is less than 110,000, the clay is low and the drying property is poor, and the strength of the coating film is insufficient.If the average molecular weight is 700,000 or more, the crosslinking density becomes extremely high, so that the solubility is poor, and it is difficult to expand and contract. The film is hard and dispersibility and coating workability deteriorate.
【０００８】本発明の塗型剤に使用するバインダー、す
なわちオルガノポリシロキサンの量は、塗型剤の固形成
分中25〜60％程度が好ましい。塗型剤の固形成分にしめ
るオルガノポリシロキサンの割合が25％以下では、フィ
ラーの分散性が著しく悪くなると共に置中子表面の硬度
が十分でなくなり、また60％以上になると加熱硬化時に
鋳巣の原因となるガスが発生しやすくなるだけでなく、
粘度が硬くなりすぎて加熱硬化時に塗型膜にきれつが入
りやすく、また液ダレを発生する惧れがある。The amount of the binder, ie, organopolysiloxane, used in the coating composition of the present invention is preferably about 25 to 60% of the solid component of the coating composition. If the proportion of the organopolysiloxane used as a solid component of the coating composition is 25% or less, the dispersibility of the filler becomes extremely poor, and the hardness of the surface of the core becomes insufficient. Not only is it easy to generate causative gas,
Viscosity is too hard, and cracks are likely to occur in the coating film during heat curing, and there is a concern that liquid dripping may occur.
【０００９】又、本発明の塗型剤に使用するフィラーの
種類については特に限定はないが、グラハイト（カーボ
ンブラック）やアルミ粉，２硫化モリブデン，ボロン、
又はこれらの混合物が好ましい。そして、使用するフィ
ラーの量は、塗型剤の固形成分中40〜75％程度が好まし
い。塗型剤の固形成分にしめるフィラーの割合が40％以
下では、オルガノポリシロキサンの分解によるガスが発
生しやすくなり、また75％以上になるとオルガノポリシ
ロキサンに対する分散性が悪くなり所要の硬度が得られ
なくなる。The type of the filler used in the coating composition of the present invention is not particularly limited, but may include graphite (carbon black), aluminum powder, molybdenum disulfide, boron,
Or a mixture thereof is preferred. The amount of the filler used is preferably about 40 to 75% of the solid component of the coating composition. If the proportion of the filler in the solid component of the coating composition is 40% or less, gas is likely to be generated due to the decomposition of the organopolysiloxane, and if it exceeds 75%, the dispersibility in the organopolysiloxane becomes poor and the required hardness is obtained. Disappears.
【００１０】更に、本発明の塗型剤に使用する添加剤と
しては、沈殿シリカ，煙霧質シリカなどの充填剤、白金
化合物などの加硫剤、等が挙げられ、また有機溶剤とし
てはキシレンやトルエンなどが挙げられる。このうち、
沈殿シリカ，煙霧質シリカなどの充填剤の添加量は、塗
型剤の固形成分中0.1 〜2 ％程度が好ましく、白金化合
物などの加硫剤の添加量は、塗型剤の固形成分中数10pp
m 程度が好ましい。また、キシレンやトルエンなどの有
機溶剤は適量とする。Further, examples of the additives used in the mold wash of the present invention include fillers such as precipitated silica and fumed silica, vulcanizing agents such as platinum compounds, and the like. Examples include toluene. this house,
The amount of fillers such as precipitated silica and fumed silica is preferably about 0.1 to 2% of the solid components of the coating composition, and the amount of the vulcanizing agent such as a platinum compound is determined by the number of solid components in the coating composition. 10pp
m is preferred. An appropriate amount of an organic solvent such as xylene or toluene is used.
【００１１】而して、本発明に係る塗型剤は、置中子の
表面に溶湯衝突による割れや溶湯の通過摩擦による剥れ
等に対する耐圧強度を付与するものであるから、同じ組
成のものを数回に分けて塗り重ねても良いが、他の組成
の塗型剤を分けて塗り重ねする場合には、先に他の組成
の塗型剤を置中子の表面に塗布して第１コーティング層
を形成せしめ、その後に、第１コーティング層の表面に
本塗型剤を第２コーティング層として塗り重ねるように
する。Since the mold wash according to the present invention imparts pressure resistance to the surface of the placing core against cracks due to the collision of the molten metal, peeling due to friction of the molten metal, and the like, it has the same composition. May be applied over several times.However, when applying and applying another type of mold wash of another composition, first apply a mold wash of another composition to the surface of the placing core. One coating layer is formed, and then the main coating composition is applied as a second coating layer on the surface of the first coating layer.
【００１２】因みに、第１コーティング層を形成する他
の組成の塗型剤としては、一例としてジルコメルト3000
mlをバインダーとし、タルク1500gmと金雲母 300gmを加
えて、その粘度をイワタ簡易粘度コップで９〜10秒／20
℃に調製したもの使用する。Incidentally, as a coating agent having another composition for forming the first coating layer, for example, Zirco Melt 3000 is used.
ml as a binder, add 1500 gm of talc and 300 gm of phlogopite, and adjust the viscosity with an Iwata simple viscosity cup to 9-10 seconds / 20.
Use those prepared at ℃.
【００１３】そして、その塗布方法としては特に限定は
なく、ディッピング、エアゾールにより吹き付け、エア
スプレー、エアレススプレー、刷毛塗り等のいずれかの
方法で行なうことができるが、置中子を溶液槽内に浸漬
させて行なうディッピングによる塗布方法が作業性，経
済性等から見て好適である。The coating method is not particularly limited, and it can be applied by any method such as dipping, spraying with an aerosol, air spray, airless spray, brushing, and the like. An application method by dipping performed by immersion is preferable from the viewpoint of workability, economy, and the like.
【００１４】又、塗型膜全体の膜厚、すなわち第１コー
ティング層と第２コーティング層とを合わせた塗型膜全
体の厚みは、500 〜700 ミクロン程度が好ましい。塗型
膜全体の厚みが500 ミクロン以下では中子の耐圧強度が
不足し、700 ミクロン以上になると塗型膜にクラックが
起きやすくなる。このうち、第１コーティング層の塗型
膜厚は 550+-50ミクロン程度に厚目に形成し、第２コー
ティング層の塗型膜厚は 100+-10ミクロン程度とするの
が良好である。The thickness of the entire coating film, that is, the total thickness of the coating film including the first coating layer and the second coating layer is preferably about 500 to 700 microns. If the thickness of the entire coating film is less than 500 microns, the pressure resistance of the core is insufficient, and if it is more than 700 microns, cracks are likely to occur in the coating film. Of these, it is preferable that the coating thickness of the first coating layer is formed to be as thick as about 550 + -50 microns, and the coating thickness of the second coating layer is about 100 + -10 microns.
【００１５】又、本発明の塗型剤をディッピング塗布す
る場合には、その粘度をイワタ簡易粘度コップで60〜65
秒／20℃の範囲に設定することが好ましい。このような
粘度範囲にすることによって、塗型剤の粒子成分の分散
性が向上し、塗型剤の粒子成分が溶液槽の底部に沈殿す
ることが少なくなると共に、塗布後の液ダレの心配もな
くなる。When the coating composition of the present invention is applied by dipping, its viscosity is adjusted to 60 to 65 with an Iwata simple viscosity cup.
It is preferable to set the temperature in a range of seconds / 20 ° C. By setting the viscosity in such a range, the dispersibility of the particle component of the coating agent is improved, the particle component of the coating agent is less likely to settle at the bottom of the solution tank, and the drip of the liquid after coating may be prevented. Is also gone.
【００１６】＜実施例＞ （１）塗型剤の調製 有機溶媒としてキシレン1700ml、充填剤として煙霧質シ
リカ15gm、加硫剤として白金化合物数10ppm を夫々混合
撹拌させながら、フィラーとしてのグラハイト500gmと
バインダーとしてのオルガノポリシロキサン 400gmを加
えて、その粘度をイワタ簡易粘度コップで60〜65秒／20
℃に調製した。<Examples> (1) Preparation of coating agent 1700 ml of xylene as an organic solvent, 15 gm of fumed silica as a filler, and 10 ppm of a platinum compound as a vulcanizing agent were mixed with 500 gm of graphite as a filler while mixing and stirring. Add 400gm of organopolysiloxane as a binder, and adjust its viscosity with an Iwata Simple Viscosity Cup for 60 to 65 seconds / 20.
C.
【００１７】（２）塗型剤の塗布 常法により崩壊性の良い材料（ケイ砂）でもって置中子
を造型し、その置中子を他の成分からなる塗型剤溶液中
に浸漬させてその表面に第１コーティング層を形成せし
め、その後該置中子を本発明に係る塗型剤の溶液槽内に
１〜２秒間浸漬させた。そして、該置中子を溶液槽から
引き上げた後、コンベヤー等の移送手段により吊り下げ
移送しながらトンネル式乾燥炉内に送り込んで20分間強
制的に加熱乾燥を行ない、塗型膜厚 100ミクロンの第２
コーティング層を形成した。(2) Application of Coating Agent A core is formed by a conventional method using a material having good disintegration (silica sand), and the core is immersed in a coating agent solution containing other components. Then, a first coating layer was formed on the surface, and then the core was immersed for 1 to 2 seconds in a solution tank of the coating composition according to the present invention. Then, after the placing core is lifted from the solution tank, it is sent into a tunnel-type drying furnace while being suspended and transferred by a transfer means such as a conveyor, and is forcibly heated and dried for 20 minutes. Second
A coating layer was formed.
【００１８】上記のようにして得た崩壊性置中子と、従
来の塗型剤を用いて製造した崩壊性置中子（比較例）と
を金型に夫々セットし、アルミ合金（ＡＤＣ１２）溶
湯、注湯温度 680℃、鋳造圧力 500〜600Kgf／cm2 前
後、ゲート速度40〜60 m／s 前後の鋳造条件下で鋳造を
行なった。その結果を下記の表１に示す。The collapsible core obtained as described above and the collapsible core (comparative example) manufactured using a conventional coating agent were set in a mold, respectively, and an aluminum alloy (ADC12) was prepared. The casting was performed under the conditions of a molten metal, a pouring temperature of 680 ° C., a casting pressure of about 500 to 600 kgf / cm 2, and a gate speed of about 40 to 60 m / s. The results are shown in Table 1 below.
【００１９】 ＜表１の評価項目の説明＞ 崩壊性＝鋳造後の製品内からの置中子の取出しやすさ。 （○：簡単に取れる、●：差し込みにより崩壊性がよく
ない、×：塗型残り有り） 差し込み＝溶湯の置中子内への差し込み状況。 （○：差し込みがない、 ×：差し込みが著しい） 耐クラック性＝塗型膜のひび割れの有無。 （○：割れがない、 ×：大きな割れがある） 表面平滑性＝製品鋳肌の凹凸の程度。 （○：凹凸がない、 ×：凹凸がある） 作業性＝塗型剤の取扱い性。 （○：粒子成分の沈殿が少なく取扱いやすい、×：粒子
成分の沈殿が速く取扱いにくい）[0019] <Explanation of evaluation items in Table 1> Collapse = Ease of taking out the core from inside the product after casting. (○: easy to remove, ●: poor disintegration due to insertion, ×: residual coating mold) Insertion = insertion of molten metal into core. (O: no insertion, X: remarkable insertion) Crack resistance = presence or absence of cracks in the coating film. (○: no cracks, ×: large cracks) Surface smoothness = degree of unevenness of product casting surface. (○: no unevenness, ×: unevenness) Workability = handleability of the coating agent. (○: Precipitation of particle components is small and easy to handle, ×: Precipitation of particle components is fast and difficult to handle)
【００２０】[0020]
【発明の効果】表１の結果からも理解されるように、本
発明に係る塗型剤を用いた崩壊性置中子により鋳造した
製品は、中子の塗型残りもなく通常の除去手段にて簡単
に崩壊除去し得ると共に、ひび割れや各種の差し込みの
発生が全くなく、平滑で寸法精度に優れたものとなる。As can be understood from the results shown in Table 1, the product cast by the disintegrating core using the mold wash according to the present invention has no core mold residue and the usual removal means. And can be easily disintegrated and removed, and there is no occurrence of cracks or various kinds of insertions, and it is smooth and excellent in dimensional accuracy.
【００２１】即ち、本発明に係る崩壊性置中子用塗型剤
によれば、鋳造圧力 500〜600Kgf／cm2 前後でゲート速
度40〜60 m／s 前後の鋳造条件下で鋳造する高速・高圧
ダイカスト法においても、溶湯の衝突による割れ及び剥
れや各種の溶湯差し込み等の発生の虞れがない優れた耐
圧強度を備えると共に、置中子表面への塗布性能に極め
て優れたものとなる。That is, according to the disintegrating core type coating composition of the present invention, the casting speed is about 500 to 600 kgf / cm 2 and the gate speed is about 40 to 60 m / s. In the high-pressure die-casting method as well, it has an excellent pressure-resistant strength with no fear of occurrence of cracks and peeling due to collision of the molten metal and various types of molten metal insertion, and extremely excellent coating performance on the surface of the placing core. .
【００２２】しかも、塗型剤の粒子成分の分散性が向上
し、塗型剤の粒子成分が溶液槽の底部に沈殿することが
少ないので、従来のように強力な撹拌を必要とせず、そ
の結果、撹拌による泡の発生の心配もなくなるので、管
理も容易となり、加えて塗布後の液ダレの心配もなくな
り、塗布作業性が大幅に改善され、塗布作業の自動化を
図ることが出来るようになる。Further, since the dispersibility of the particle component of the coating agent is improved and the particle component of the coating agent is less likely to settle at the bottom of the solution tank, strong stirring is not required unlike the conventional method. As a result, there is no need to worry about the generation of bubbles due to agitation, so that it is easy to manage, and in addition, there is no need to worry about liquid dripping after coating, so that coating workability is greatly improved and coating work can be automated. Become.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B22C 3/00,9/10 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B22C 3/00, 9/10
Claims (1)
分散させてなる崩壊性置中子用塗型剤において、前記バ
インダーがシラノール基又はアルコキシ基結合したケイ
素原子を１分子中に少なくとも２個有し且つ110,000 〜
700,000 の平均分子量を有する直鎖状オルガノポリシロ
キサンであることを特徴とする崩壊性置中子用塗型剤。1. A disintegrating coating composition for disintegrating cores comprising a binder in which a filler and a small amount of additives are dispersed, wherein the binder has at least two silicon atoms bonded to a silanol group or an alkoxy group in one molecule. And 110,000 〜
What is claimed is: 1. A disintegrating mold for a core which is a linear organopolysiloxane having an average molecular weight of 700,000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04183680A JP3133158B2 (en) | 1992-07-10 | 1992-07-10 | Coating agent for disintegratable core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04183680A JP3133158B2 (en) | 1992-07-10 | 1992-07-10 | Coating agent for disintegratable core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0623476A JPH0623476A (en) | 1994-02-01 |
| JP3133158B2 true JP3133158B2 (en) | 2001-02-05 |
Family
ID=16140050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04183680A Expired - Fee Related JP3133158B2 (en) | 1992-07-10 | 1992-07-10 | Coating agent for disintegratable core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3133158B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6011990B1 (en) * | 2016-06-24 | 2016-10-25 | 株式会社ｓｍａｔｔ | Tabletop display stand |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3123365B1 (en) * | 2021-06-01 | 2024-05-31 | Commissariat Energie Atomique | METHOD FOR COATING A REFRACTORY ALLOY PART AND PART THUS COATED. |
-
1992
- 1992-07-10 JP JP04183680A patent/JP3133158B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6011990B1 (en) * | 2016-06-24 | 2016-10-25 | 株式会社ｓｍａｔｔ | Tabletop display stand |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0623476A (en) | 1994-02-01 |
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| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |