JPH0623476A - Coating agent for collapsible placed core - Google Patents
Coating agent for collapsible placed coreInfo
- Publication number
- JPH0623476A JPH0623476A JP18368092A JP18368092A JPH0623476A JP H0623476 A JPH0623476 A JP H0623476A JP 18368092 A JP18368092 A JP 18368092A JP 18368092 A JP18368092 A JP 18368092A JP H0623476 A JPH0623476 A JP H0623476A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- coating agent
- core
- binder
- placed core
- 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.)
- Granted
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Paints Or Removers (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
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 coating agent which is applied to the surface of a disintegrating core which can be disintegrated and removed from the inside of the product after die casting 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 disintegrating core used in die casting has not only disintegration that can be easily taken out from the inside of the product after casting, but also the pressure of the molten metal injected at high speed and high pressure. It is required to have pressure resistance that will not be destroyed even if it is received. Therefore, in order to impart pressure resistance strength that can withstand the molten metal pressure during injection filling, surface treatment is performed by applying a coating agent to the surface of the insert core made of a material having good disintegration.
【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。Thus, as the type-approaching agent closest to the present invention, there is the one disclosed in JP-A-2-235562.
However, with this conventional coating agent, the casting pressure is 500 to 600K.
When high-speed, high-pressure die-casting is performed in which the product is cast under gf / cm 2 and a gate speed of 40-60 m / s, small cracks due to molten metal collision on the coating film and peeling due to passing friction of molten metal And the molten metal is likely to be inserted into the molten metal.Therefore, when filling the molten metal, a part of the core is damaged, causing defective molding, and there is a problem such as leaving a coating die inside the product after casting. However, the disintegration property and the pressure resistance 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。In addition, since the viscosity of the conventional coating agent is as low as 10 to 20 seconds / 20 ° C. in the Iwata Simple Viscosity Cup, the coating agent applied to the surface of the placement core is liable to cause liquid dripping. At the same time, the particle components of the coating agent tend to settle at the bottom of the solution tank containing the coating agent, so it is necessary to constantly stir the coating agent during the coating work, which causes bubbles in the coating agent. As a result, it was not possible to apply it neatly to the surface of the placement core, resulting in problems such as insertion of the molten metal.
【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 the above-mentioned conventional problems. Even when high speed / high pressure die casting is performed, the coating film formed on the surface of the placement core is molten. It is intended to provide a coating agent that has pressure resistance strength that does not cause the occurrence of molten metal insertion due to cracking and peeling due to collision of the above, and has extremely excellent coating performance on the surface of the placement 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。A mold disintegrating agent for a disintegrating core according to the present invention which achieves the above object is a disintegrating mold for a disintegrating core formed by dispersing a filler and a small amount of an additive in a binder. In the agent, the binder is a linear organopolysiloxane having at least two silicon atoms bonded to silanol groups or alkoxy groups 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。EXAMPLES The coating agent according to the present invention comprises a binder in which a filler and a small amount of an additive are dispersed, and an appropriate amount of an organic solvent is added thereto. The binder according to the present invention is a linear, high-polymerization degree organopolysiloxane, and more specifically, a heat-vulcanizable dimethyl-based, methylvinyl-based, or methyl-vulcanized vulcanized dimethyl-based, methylvinyl-based, or methyl-based resin that gives elastic performance by a crosslinking reaction that proceeds by heating. Uses linear organopolysiloxanes such as phenyl vinyl type and methyl fluoroalkyl type, and has an average molecular weight of 110,
Those in the range of 000 to 700,000 are desirable. When the average molecular weight is less than 110,000, the clay is low and the drying property is poor, resulting in insufficient strength of the coating film.When the average molecular weight is 700,000 or more, the crosslink density becomes extremely high, so that the solubility is poor and it becomes difficult to expand and contract. The film is hard and the dispersibility and coating workability are poor.
【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, that is, the organopolysiloxane, used in the coating composition of the present invention is preferably about 25 to 60% of the solid component of the coating composition. When the proportion of the organopolysiloxane used as the solid component of the coating agent is 25% or less, the dispersibility of the filler is significantly deteriorated and the hardness of the surface of the insert core becomes insufficient. Not only is it easy to generate the causative gas,
Since the viscosity becomes too hard, the coating film may be easily cracked at the time of heat curing, and there is a risk of liquid dripping.
【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 kind of the filler used in the coating agent of the present invention is not particularly limited, but it is not limited to a particular type, such as glaite (carbon black), aluminum powder, molybdenum disulfide, boron,
Alternatively, mixtures of these are preferred. The amount of the filler used is preferably about 40 to 75% in the solid component of the mold wash. If the proportion of the filler in the solid component of the coating agent is 40% or less, gas is easily generated due to the decomposition of the organopolysiloxane, and if it is 75% or more, the dispersibility in the organopolysiloxane becomes poor and the required hardness is obtained. Disappear.
【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, as the additives used in the coating agent of the present invention, there may be mentioned fillers such as precipitated silica and fumed silica, vulcanizing agents such as platinum compounds, and the like, and xylene and organic solvents as organic solvents. Examples include toluene. this house,
The addition amount of filler such as precipitated silica and fumed silica is preferably about 0.1 to 2% in the solid component of the coating agent, and the addition amount of the vulcanizing agent such as a platinum compound is the same as that of the solid component of the coating agent. 10pp
About m is preferable. Moreover, an organic solvent such as xylene or toluene is used in an appropriate amount.
【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 coating agent according to the present invention imparts pressure resistance to the surface of the insert core against cracking due to collision of the molten metal and peeling due to passing friction of the molten metal, it has the same composition. May be applied several times, but when applying a different type of coating agent separately, a coating agent of another composition is first applied to the surface of the placement core. One coating layer is formed, and then the main coating agent 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 mold coating agent having another composition for forming the first coating layer, Zircomelt 3000 is used as an example.
ml as binder, 1500gm of talc and 300gm of phlogopite are added, and the viscosity is 9 to 10 seconds / 20 with a simple iwata cup.
Use the one 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 may be applied by any method such as dipping, spraying with an aerosol, air spraying, airless spraying or brush coating. The coating method by dipping and dipping is preferable from the viewpoint of workability and economy.
【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 total thickness of the 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 μm. If the thickness of the whole coating film is less than 500 μm, the pressure resistance of the core is insufficient, and if it exceeds 700 μm, cracks are likely to occur in the coating film. Of these, it is preferable that the coating thickness of the first coating layer is 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 agent of the present invention is applied by dipping, its viscosity is 60 to 65 with a simple cotton Iwata cup.
It is preferable to set in the range of sec / 20 ° C. By adjusting the viscosity within such a range, the dispersibility of the particle component of the mold coating agent is improved, the particle component of the mold coating agent is less likely to settle at the bottom of the solution tank, and there is a fear of liquid dripping after coating. Also disappears.
【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 are mixed and stirred, respectively, and 500 gm of glaite as a filler is mixed. 400gm of organopolysiloxane as a binder was added, and the viscosity was 60 to 65 seconds / 20 with a simple Iwata cup.
It was adjusted to ℃.
【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 a mold-releasing agent According to a conventional method, a molding core is made of a material having a good disintegrating property (silica sand), and the molding core is immersed in a solution of a molding agent containing other components. A first coating layer was formed on the surface of the mold, and then the placement core was immersed in the bath of the coating agent of the present invention for 1 to 2 seconds. Then, after pulling out the storage core from the solution tank, it is hung and transferred by a transfer means such as a conveyor and sent into a tunnel-type drying oven for forced heating and drying for 20 minutes to obtain a coating film thickness of 100 microns. 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 disintegrating tin core obtained as described above and the disintegrating tin core (comparative example) produced by using a conventional coating agent were set in a mold, respectively, and an aluminum alloy (ADC12) was used. Casting was performed under the casting conditions of molten metal, pouring temperature of 680 ° C., casting pressure of about 500 to 600 Kgf / cm 2 , and 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> Disintegration property = Ease of removal of the insert core from the product after casting. (○: Easy to take, ●: Poor disintegration due to insertion, ×: Remaining coating type) Insert = Insertion status of molten metal into the storage core. (○: No insertion, ×: Significant insertion) Crack resistance = Presence of cracks in the coating film. (O: No crack, X: Large crack) Surface smoothness = degree of unevenness of product casting surface. (○: no unevenness, x: unevenness) Workability = handling of the coating agent. (○: Little precipitation of particle component is easy to handle, ×: Precipitation of particle component 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 of Table 1, the product cast by the disintegrating core using the mold coating agent according to the present invention has no core coating mold residue and the usual removing means. It can be easily disintegrated and removed by using, and it is smooth and has excellent dimensional accuracy without any cracks or various insertions.
【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 mold disintegrating agent for a disintegrating insert according to the present invention, a casting speed of about 500 to 600 Kgf / cm 2 and a gate speed of about 40 to 60 m / s. Even in the high-pressure die casting method, it has excellent pressure resistance without the risk of cracking and peeling due to molten metal collision and various molten metal insertion, etc., and it will be extremely excellent in coating performance on the surface of the placement 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。Furthermore, 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, it is not necessary to use strong stirring as in the conventional case. As a result, there is no need to worry about the generation of bubbles due to stirring, so management is easier, and in addition, there is no worry of liquid dripping after coating, and the coating workability is greatly improved and the coating work can be automated. Become.
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 mold coating agent 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. Shikatsu 110,000-
A coating agent for a disintegrating insert 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 true JPH0623476A (en) | 1994-02-01 |
| JP3133158B2 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 |
|---|---|---|---|---|
| FR3123365A1 (en) * | 2021-06-01 | 2022-12-02 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | METHOD FOR COATING A PART IN REFRACTORY ALLOY AND PART THUS COATED. |
Families Citing this family (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 |
-
1992
- 1992-07-10 JP JP04183680A patent/JP3133158B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3123365A1 (en) * | 2021-06-01 | 2022-12-02 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | METHOD FOR COATING A PART IN REFRACTORY ALLOY AND PART THUS COATED. |
| WO2022254139A1 (en) * | 2021-06-01 | 2022-12-08 | Safran | Method for coating a refractory alloy part, and the part thus coated |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3133158B2 (en) | 2001-02-05 |
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| LAPS | Cancellation because of no payment of annual fees |