JP2002097481A - Powdered mold release lubricant for mold casting - Google Patents
Powdered mold release lubricant for mold castingInfo
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- JP2002097481A JP2002097481A JP2000291412A JP2000291412A JP2002097481A JP 2002097481 A JP2002097481 A JP 2002097481A JP 2000291412 A JP2000291412 A JP 2000291412A JP 2000291412 A JP2000291412 A JP 2000291412A JP 2002097481 A JP2002097481 A JP 2002097481A
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- powder
- mold
- molten metal
- release lubricant
- inorganic
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、無機物質の熱分解
により発生した気体を断熱境界層として利用する金型鋳
造用の粉体離型潤滑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 powder release lubricant for mold casting that utilizes a gas generated by thermal decomposition of an inorganic substance as a heat insulating boundary layer.
【０００２】[0002]
【従来の技術】金型鋳造プロセスで使用される粉体離型
潤滑剤としては、 溶融金属から金型への熱流速を小さく
するために、断熱性および保温性に優れた無機物粉体が
主に使用されている。無機物粉体自体の断熱性、保温性
等の特性を利用しようとする場合、タルク等の天然鉱産
物から選択せざるを得ないケースが多く、天然鉱産物で
あるが故に原産地によっては不純物としてアスベストや
クリスタリンシリカ（結晶質シリカ）の混入が懸念され
る。このように、無機物粉体自体の断熱性、保温性等を
利用する場合には、原料選択に際して制約が大きく、場
合によっては離型潤滑剤として極めてコストの高いもの
となっていた。2. Description of the Related Art In order to reduce the heat flow from a molten metal to a mold, an inorganic powder excellent in heat insulation and heat retention is mainly used as a powder release lubricant used in a mold casting process. Used in When trying to utilize the properties of the inorganic powder itself such as heat insulation and heat retention, there are many cases where natural mineral products such as talc must be selected, and as a natural mineral product, asbestos may be an impurity depending on the place of origin. And crystallin silica (crystalline silica) may be mixed. As described above, when utilizing the heat insulating property, heat retaining property, and the like of the inorganic powder itself, there are great restrictions in selecting the raw material, and in some cases, the cost of the release lubricant is extremely high.
【０００３】他方、有機物粉体、例えばポリエチレンワ
ックスや金属石鹸等は、原料イニシャルコストが高いだ
けでなく、多用した場合、溶融金属と接触した際にメタ
ンやエタン、水素等の分解発生ガスが鋳造製品中に入
り、製品の品位を低下させる要因になることがあった。On the other hand, organic powders, such as polyethylene wax and metal soap, not only have a high initial cost of raw materials, but when they are frequently used, when they come into contact with molten metal, decomposition gases such as methane, ethane, and hydrogen are cast. In some cases, it may enter the product and cause a deterioration in the quality of the product.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記の実状
に鑑み開発されたもので、無機物粉体自体の断熱性を利
用するのではなく、粉体を構成する無機物が溶融金属と
接触した際に熱分解して発生する気体を、溶融金属と金
型との間の断熱境界層として利用することによって、溶
融金属から金型への熱伝達を効果的に低減することがで
き、しかも安価な、無機物粉体を利用した金型鋳造用の
粉体離型潤滑剤を提案することを目的とする。SUMMARY OF THE INVENTION The present invention has been developed in view of the above-mentioned situation. Instead of utilizing the heat insulating properties of the inorganic powder itself, the inorganic material constituting the powder comes into contact with the molten metal. By utilizing the gas generated by thermal decomposition as an adiabatic boundary layer between the molten metal and the mold, heat transfer from the molten metal to the mold can be effectively reduced, and at a low cost An object of the present invention is to propose a powder release lubricant for mold casting using an inorganic powder.
【０００５】[0005]
【課題を解決するための手段】すなわち、本発明の要旨
構成は次のとおりである。 １．溶融金属との接触により、熱分解して気体を発生す
る無機物粉体からなることを特徴とする金型鋳造用の粉
体離型潤滑剤。The gist of the present invention is as follows. 1. A powder release lubricant for mold casting, comprising an inorganic powder which is thermally decomposed to generate a gas upon contact with a molten metal.
【０００６】２．溶融金属との接触により、熱分解して
気体を発生する熱分解温度が 100〜1000℃の範囲にあ
る、無機物粉体を用いること特徴とする上記１記載の金
型鋳造用の粉体離型潤滑剤。[0006] 2. 2. The powder release for mold casting as described in 1 above, wherein an inorganic powder having a thermal decomposition temperature of generating a gas by thermal decomposition upon contact with the molten metal is in a range of 100 to 1000 ° C. lubricant.
【０００７】３．熱分解による気体発生後も、分解物ま
たは生成物として無機物を生成する無機物粉体を用いる
ことを特徴とする上記１または２記載の金型鋳造用の粉
体離型潤滑剤。[0007] 3. 3. The powder release lubricant for mold casting according to the above item 1 or 2, wherein an inorganic powder which generates an inorganic substance as a decomposition product or a product even after gas generation by thermal decomposition is used.
【０００８】４．水酸化物または炭酸塩のうちから選ん
だ少なくとも一種からなる無機物粉体中に、潤滑性の向
上剤としてグラファイトおよび／または窒化硼素を50ma
ss％以下で配合したことを特徴とする請求項１，２また
は３記載の金型鋳造用の粉体離型潤滑剤。[0008] 4. 50% of graphite and / or boron nitride is added as a lubricity improver to an inorganic powder of at least one selected from hydroxides and carbonates.
The powder release lubricant for mold casting according to claim 1, 2 or 3, wherein the lubricant is blended at ss% or less.
【０００９】５．無機物粉体中に、付着性および潤滑性
の向上剤として有機物粉体を50mass％以下で配合したこ
とを特徴とする請求項１〜４のいずれかに記載の金型鋳
造用の粉体離型潤滑剤。[0009] 5. The powder release for mold casting according to any one of claims 1 to 4, wherein the inorganic powder is mixed with an organic powder as an improver of adhesion and lubricity at 50 mass% or less. lubricant.
【００１０】６．粉体状有機物が、合成高分子化合物ま
たは脂肪酸金属塩のうちから選んだ少なくとも一種であ
る上記５記載の金型鋳造用の粉体離型潤滑剤。[0010] 6. 6. The powder release lubricant for mold casting according to the above item 5, wherein the powdery organic substance is at least one selected from a synthetic polymer compound and a fatty acid metal salt.
【００１１】[0011]
【発明の実施の形態】以下、本発明を具体的に説明す
る。本発明は、無機物粉体と溶融金属との接触により、
熱分解して発生した気体を断熱境界層として利用する。
というのは、上記のようにして発生させた気体は、鋳造
プロセスにおいて流動している溶融金属と金型の間に切
れ目なく浸透するので、かかる気体膜を境界層として利
用することにより、効果的な断熱性、保温性が得られる
からである。ここに、このような無機物粉体の代表例を
例示すると次のとおりである。水酸化アルミニウム、水
酸化カルシウム、水酸化マグネシウム、炭酸カルシウ
ム、炭酸マグネシウム、塩基性炭酸マグネシウム、カオ
リナイト、タルク。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The present invention, by contact of the inorganic powder and the molten metal,
The gas generated by thermal decomposition is used as an adiabatic boundary layer.
Because the gas generated as described above penetrates seamlessly between the molten metal flowing in the casting process and the mold, it is effective to use such a gas film as a boundary layer. This is because excellent heat insulation and heat retention can be obtained. Here, typical examples of such an inorganic powder are as follows. Aluminum hydroxide, calcium hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, basic magnesium carbonate, kaolinite, talc.
【００１２】また、上記したような無機物粉体しとて
は、熱分解温度が大気雰囲気下において 100〜1000℃の
範囲にあるものが好ましい。というのは、熱分解温度が
100℃未満では、通常金型表面は 200〜300 ℃に保持さ
れているため、付着と同時に分解してしまうおそれがあ
り、一方1000℃超では溶融金属と接触しても分解が起こ
り難く、ガス発生が生じないおそれがあるからである。
なお、かような無機物粉体としては、上掲した各粉体の
うち、水酸化アルミニウム、水酸化カルシウム、水酸化
マグネシウム、炭酸カルシウム、炭酸マグネシウム、塩
基性炭酸マグネシウム、カオリナイト等が挙げられる。The inorganic powder preferably has a thermal decomposition temperature in the range of 100 to 1000 ° C. in the atmosphere. Because the thermal decomposition temperature
If the temperature is lower than 100 ° C, the mold surface is usually kept at 200 to 300 ° C, so there is a possibility that it will be decomposed simultaneously with adhesion. This is because generation may not occur.
Examples of such inorganic powders include aluminum hydroxide, calcium hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, basic magnesium carbonate, kaolinite and the like among the above-mentioned powders.
【００１３】さらに、かかる無機物粉体としては、熱分
解して気体を発生した後も、分解物または生成物として
無機物粒子を生成するものがとりわけ好適である。とい
うのは、熱分解により気体を発生した後も、分解物また
は生成物として無機物粒子が生成すると、発生した気体
が生成した無機物粉体でピン止めされることから、より
均一な断熱層が形成され、その結果、溶融金属から金型
への熱流速を格段に低減して良好な離型潤滑性能が発揮
されるからである。かかる無機物粉体としては、上掲し
た各粉体のうち、水酸化アルミニウム、水酸化マグネシ
ウム、炭酸マグネシウム、炭酸カルシウム、塩基性炭酸
マグネシウム、カオリナイト等が挙げられる。Further, as the inorganic powder, those which generate inorganic particles as a decomposition product or a product even after generating a gas by thermal decomposition are particularly preferable. In other words, even after gas is generated by thermal decomposition, if inorganic particles are generated as decomposition products or products, the generated gas is pinned by the generated inorganic powder, so a more uniform heat insulating layer is formed As a result, the heat flow rate from the molten metal to the mold is significantly reduced, and good release lubrication performance is exhibited. Examples of the inorganic powder include aluminum hydroxide, magnesium hydroxide, magnesium carbonate, calcium carbonate, basic magnesium carbonate, kaolinite and the like among the above-mentioned powders.
【００１４】また、本発明では、熱分解により気体を発
生する無機物粉体として水酸化物または炭酸塩のうちか
ら選んだ少なくとも一種と、潤滑性の向上剤としてグラ
ファイトおよび／または窒化硼素とを混合した無機混合
粉体を利用することもできる。本発明によれば、無機物
粉体として水酸化物または炭酸塩を使用することにより
安価な金型鋳造用離型潤滑剤の供給が可能となる。ま
た、グラファイト、窒化硼素のような六方結晶構造を有
し、かつ自己潤滑性を具備する固体潤滑剤を併用するこ
とにより潤滑性、離型性の一層の向上を図ることができ
る。ここに、グラファイトや窒化硼素の配合比があまり
に多いと、製品表面が黒ずみ外観不良の要因になった
り、コストアップになるだけでなく、気体発生量が抑制
されるおそれがあるので、これらの配合比は50mass％以
下程度とすることが好ましい。なお、上記した水酸化物
または炭酸塩としては、水酸化アルミニウム、水酸化カ
ルシウム、水酸化マグネシウム、炭酸カルシウム、炭酸
マグネシウム、塩基性炭酸マグネシウム、カオリナイト
等が挙げられる。Further, in the present invention, at least one selected from hydroxides and carbonates as inorganic powder which generates a gas by thermal decomposition, and graphite and / or boron nitride as a lubricity improver are mixed. Inorganic mixed powders can also be used. According to the present invention, an inexpensive mold release lubricant for mold casting can be supplied by using a hydroxide or a carbonate as the inorganic powder. Further, by using a solid lubricant having a hexagonal crystal structure such as graphite and boron nitride and having self-lubricating properties, lubricating properties and releasability can be further improved. If the compounding ratio of graphite or boron nitride is too large, not only does the product surface become dark and the appearance becomes poor, the cost increases, but also the amount of gas generated may be suppressed. The ratio is preferably set to about 50 mass% or less. In addition, as said hydroxide or carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, basic magnesium carbonate, kaolinite, etc. are mentioned.
【００１５】さらに、本発明では、無機物粉体の金型へ
の付着性を向上させ、しかも潤滑性能を確保する目的
で、無機物粉体中に、有機物粉体を50mass％以下で配合
することができる。すなわち、本発明の粉体離型潤滑剤
において、無機物粉体だけでは付着力に欠ける場合で
も、有機物粉体を併用することにより付着力が期待で
き、併せて潤滑性能の向上を図ることができる。なお、
有機物粉体の配合量の上限を50mass％としたのは、50ma
ss％を超えると有機物から発生する分解ガス量が多くな
りすぎ、鋳造品に巻込まれたりして、品位の低下を招く
おそれがあるからである。Further, in the present invention, for the purpose of improving the adhesion of the inorganic powder to the mold and ensuring the lubricating performance, the inorganic powder is blended with the organic powder at 50 mass% or less. it can. That is, in the powder release lubricant of the present invention, even when the inorganic powder alone lacks the adhesive force, the adhesive force can be expected by using the organic powder together, and the lubricating performance can be improved at the same time. . In addition,
The upper limit of the amount of the organic powder to be 50 mass% is 50 ma
If the content exceeds ss%, the amount of the decomposition gas generated from the organic matter becomes excessively large, and may be caught in a cast product, which may cause deterioration in quality.
【００１６】ここに、かような有機物としては、ポリエ
チレンワックスやポリプロピレンワックスのような合成
高分子化合物ならびにリチウムステアレートやカルシウ
ムステアレート、ジンクステアレートのような脂肪酸金
属塩が好適である。かような高分子化合物や脂肪酸金属
塩は融点が低く、金型表面温度を感知して固体から液体
へと変化する時に金型表面で濡れ効果を発揮して付着力
を増す。また、凝固した金属と金型との間に介入して離
型潤滑性を向上させる効果もある。Here, as such organic substances, synthetic high molecular compounds such as polyethylene wax and polypropylene wax and metal salts of fatty acids such as lithium stearate, calcium stearate and zinc stearate are preferable. Such a polymer compound or a fatty acid metal salt has a low melting point and exhibits a wetting effect on the mold surface when the mold surface temperature is changed to change from a solid to a liquid, thereby increasing the adhesive force. In addition, there is also an effect of improving mold release lubrication by intervening between the solidified metal and the mold.
【００１７】次に、本発明の基礎となった実験結果につ
いて説明する。なお、本発明では、粉体離型潤滑剤の断
熱・保温効果を、溶融金属を流し込んだ時の流動長Ｌで
評価した。流動長は、図１に示す流動長測定装置で測定
するものとし、図中番号１は坩堝、２はストッパー、３
は温度計、そして４が溶融金属（Al合金）である。ま
た、５は溶融金属４の流路、６はヒータであり、７はの
ぞき窓、８はズーム顕微鏡、９はハイスピードＶＴＲで
ある。Next, the experimental results on which the present invention is based will be described. In the present invention, the heat insulating and heat retaining effects of the powder release lubricant were evaluated based on the flow length L when the molten metal was poured. The flow length shall be measured by the flow length measuring device shown in FIG. 1. In the figure, number 1 is a crucible, 2 is a stopper,
Is a thermometer, and 4 is a molten metal (Al alloy). Reference numeral 5 denotes a flow path of the molten metal 4, reference numeral 6 denotes a heater, reference numeral 7 denotes a viewing window, reference numeral 8 denotes a zoom microscope, and reference numeral 9 denotes a high-speed VTR.
【００１８】さて、図１に示したような流動長測定金型
の流路５に予め、粉体離型潤滑剤を２g/m2の割合で均一
に塗布する。また、比較例として、一般に用いられてい
る水性潤滑剤を通常の使用条件に希釈して、同様に金型
に塗布した。離型潤滑剤塗布後、流動長測定金型を 200
℃に昇温する。温度はＰＩＤ制御によって誤差±１℃に
制御した。Now, a powder release lubricant is uniformly applied in advance to the flow path 5 of the flow length measuring mold as shown in FIG. 1 at a rate of 2 g / m 2 . In addition, as a comparative example, a commonly used aqueous lubricant was diluted under ordinary use conditions and applied to a mold in the same manner. After applying the release lubricant, set the flow length measurement mold to 200
Heat to ° C. The temperature was controlled to an error of ± 1 ° C. by PID control.
【００１９】次に、 600℃に予熱したステンレス製の坩
堝１を、金型（上型）の所定の位置に設定し、ステンレ
ス製のストッパー２で栓をする。なお、坩堝１の内面お
よびストッパー２の外周面には、いわゆる「とがた」が
塗ってある。その後、700 ℃の溶融アルミニウム合金
（ADC 12）溶湯４を坩堝１内に注ぐ。その際、溶湯の静
水圧を一定にするため、常に一定の高さまで溶湯を注ぐ
ようにする。溶湯４を坩堝１に注いだのち、ＣＡ熱電対
を溶湯内に挿入し温度を測定する。溶湯温度が 630℃に
なった段階でストッパー２を引き上げると、溶湯４は流
動長測定金型（下型）に彫り込まれた流路５に流れ込
む。凝固後、鋳造物の長さを測ることによって流動長Ｌ
を測定する。Next, the stainless steel crucible 1 preheated to 600 ° C. is set at a predetermined position of a metal mold (upper mold), and is plugged with a stainless steel stopper 2. Note that the inner surface of the crucible 1 and the outer peripheral surface of the stopper 2 are painted with a so-called "shape". Thereafter, a molten aluminum alloy (ADC 12) 4 at 700 ° C. is poured into the crucible 1. At that time, in order to keep the hydrostatic pressure of the molten metal constant, the molten metal is always poured to a certain height. After pouring the molten metal 4 into the crucible 1, a CA thermocouple is inserted into the molten metal to measure the temperature. When the stopper 2 is lifted when the temperature of the molten metal reaches 630 ° C., the molten metal 4 flows into the flow path 5 engraved in the flow length measuring die (lower die). After solidification, the flow length L is determined by measuring the length of the casting.
Is measured.
【００２０】上記の要領で種々の離型潤滑剤について流
動長Ｌを測定したが、本発明の要件を満足する、溶融金
属（溶湯）との接触により熱分解してガスを発生する無
機物としては、水酸化アルミニウム〔Al(OH)3 〕、水酸
化カルシウム〔Ca(OH)2 〕および炭酸カルシウム〔CaCO
3 〕を用いた。なお、これらの無機物粉体の平均粒径は
いずれも 0.5〜30μm 程度とした。The flow lengths L of various release lubricants were measured in the manner described above. Among the inorganic substances which satisfy the requirements of the present invention and which generate gas when thermally decomposed by contact with a molten metal (molten metal), , Aluminum hydroxide (Al (OH) 3 ), calcium hydroxide (Ca (OH) 2 ) and calcium carbonate (CaCO
3 ] was used. The average particle size of each of these inorganic powders was about 0.5 to 30 μm.
【００２１】まず、これらの無機物粉体が、何度で熱分
解し、どれくらいの気体を発生するかを熱天秤で測定し
た。その結果を図２に示す。なお、実験はAr雰囲気中で
行い、昇温速度は10℃/minとした。同図に示したよう
に、重量変化から、水酸化アルミニウムは 300℃前後で
熱分解し、１ｇ当たりおよそ370 mlの水蒸気を熱分解ガ
スとして発生することが判明した。ここに、ガス発生量
は、いわゆる標準状態（０℃、１気圧）に換算した量で
ある。同様に、水酸化カルシウムは 450℃前後で熱分解
し、１ｇ当たりおよそ250 mlの水蒸気を熱分解ガスとし
て発生することが判明した。また、炭酸カルシウムは 7
00℃前後で熱分解し、１ｇ当たりおよそ100 mlの二酸化
炭素を熱分解ガスとして発生することが判明した。この
ように、これらの無機物粉体は、ダイカスト鋳造時にス
リーブ（射出シリンダー内部）または金型内部で、600
℃以上の溶融アルミニウムと接触することによって熱分
解し、気体を発生する。First, how many times these inorganic powders were thermally decomposed and how much gas was generated was measured with a thermobalance. The result is shown in FIG. The experiment was performed in an Ar atmosphere, and the temperature was raised at a rate of 10 ° C./min. As shown in the figure, it was found from the change in weight that aluminum hydroxide was thermally decomposed at about 300 ° C. and generated about 370 ml of water vapor per gram as a pyrolysis gas. Here, the gas generation amount is an amount converted to a so-called standard state (0 ° C., 1 atm). Similarly, it was found that calcium hydroxide was thermally decomposed at around 450 ° C. and generated about 250 ml of steam per gram as a pyrolysis gas. Also, calcium carbonate is 7
It was found that pyrolysis occurred at about 00 ° C., and about 100 ml of carbon dioxide per gram was generated as a pyrolysis gas. As described above, these inorganic powders are transferred to the sleeve (inside of the injection cylinder) or the inside of the mold during die casting.
The substance decomposes by contact with molten aluminum having a temperature of ℃ or more, generating gas.
【００２２】次に、各無機物粉体を単体で使用した場
合、また副成分としてグラファイトや有機物粉体を配合
して用いた場合について、流動長Ｌを測定した結果を、
従来の離型潤滑剤のそれと比較して図３に示す。従来、
粉体離型潤滑剤では、無機物として主にタルクが用いら
れてきたが、この場合は、タルク自身のもつ低い熱伝導
特性を利用して、溶湯と金型との間の熱伝達を低減させ
るものであった。これに対し、本発明の粉体離型潤滑剤
を用いた場合には、タルクと比べると、水酸化カルシウ
ムで約30％、また水酸化アルミニウムで約40％流動長Ｌ
が改善されている。Next, when each inorganic powder was used alone or when graphite or an organic powder was blended and used as an auxiliary component, the flow length L was measured.
FIG. 3 shows a comparison with that of the conventional release lubricant. Conventionally,
In the case of powder release lubricants, talc has been mainly used as an inorganic substance. In this case, the heat transfer between the molten metal and the mold is reduced by utilizing the low thermal conductivity of the talc itself. Was something. On the other hand, when the powder release lubricant of the present invention was used, the flow length L was about 30% with calcium hydroxide and about 40% with aluminum hydroxide compared with talc.
Has been improved.
【００２３】また、従来用いられてきた水溶性離型剤と
比べると、水酸化カルシウム（記号Ｃで表示する）とグ
ラファイト（同Ｇ）、ワックス（同Ｗ）を混合した粉体
離型潤滑剤 (図中のＣＧＷ (54，36，10))では 2.2倍、
また水酸化カルシウムの代わりに水酸化アルミニウムを
用いた粉体離型潤滑剤 (図中のＡＧＷ (50, 25, 25))で
は 3.4倍もの流動長を示した。なお、水酸化カルシウム
や水酸化アルミニウムの代わりにタルクを使用した粉体
離型潤滑剤 (図中のＴＧＷ (50, 25, 25))では、従来の
水溶性離型剤に比べると1.8 倍の流動長が得られたが、
本発明に従い無機物粉体として水酸化カルシウムや水酸
化アルミニウムを用いた場合に比べると、その効果は劣
っていた。Also, compared with the conventionally used water-soluble release agent, a powder release lubricant obtained by mixing calcium hydroxide (denoted by symbol C), graphite (G) and wax (W). (CGW (54,36,10) in the figure) 2.2 times,
The powder release lubricant using aluminum hydroxide instead of calcium hydroxide (AGW (50, 25, 25) in the figure) showed a flow length as much as 3.4 times. In addition, the powder release lubricant using talc instead of calcium hydroxide or aluminum hydroxide (TGW (50, 25, 25) in the figure) is 1.8 times that of the conventional water-soluble release agent. The flow length was obtained,
The effect was inferior to the case where calcium hydroxide or aluminum hydroxide was used as the inorganic powder according to the present invention.
【００２４】上記したように、本発明に従う粉体離型潤
滑剤を用いた場合に優れた流動性が得られる理由は、粉
体離型潤滑剤中の成分として含まれる無機物粉体が溶湯
と接触した際に加熱されて気体を発生し、溶湯と金型の
間に効果的に気相膜が形成され、これが断熱境界層とし
て作用するためである。As described above, the reason why excellent fluidity is obtained when the powder release lubricant according to the present invention is used is that the inorganic powder contained as a component in the powder release lubricant is mixed with the molten metal. This is because the gas is heated when contacted to generate gas, and a gas phase film is effectively formed between the molten metal and the mold, which acts as an adiabatic boundary layer.
【００２５】また、水溶性離型剤、ＴＧＷ (50, 25, 2
5) およびＡＧＷ (50, 25, 25) をそれぞれ、金型上に
２ｇ/m2 塗布した時の溶融金属から金型への熱伝達率
は、各々14, ３，２ kW/M2K であり、この数値からもＡ
ＧＷ (50, 25, 25) が断熱性に優れていることが判る。Also, a water-soluble release agent, TGW (50, 25, 2
5) and AGW (50, 25, 25) were applied to the mold at 2 g / m 2 , respectively, and the heat transfer coefficient from the molten metal to the mold was 14, 3, 2 kW / M 2 K, respectively. Yes, from this figure, A
It can be seen that GW (50, 25, 25) has excellent heat insulating properties.
【００２６】[0026]
【実施例】表１に示す配合割合になる粉体離型潤滑剤を
用いて、以下の条件で金型鋳造を行い、その際の湯流れ
不良、外観不良、型残りピン折れおよびブリスターの発
生状況について調べた。得られた結果を表２に示す。 鋳造条件 ・ダイカストマシン 350 トン模型コールドチヤンバ ・鋳造品 ケース類 ・材質 ＡＤＣ12 ・鋳込み温度 680 ℃ ・鋳込み重量 440 g ・粉体離型剤供給装置 市販品 ・粉体離型剤吐出量 0.7g／1 ショット ・粉体離型剤吐出時のキャビティ内圧力 500Torr ・ショット数 250 EXAMPLES Die casting was performed under the following conditions using a powder release lubricant having the compounding ratio shown in Table 1, and at that time, poor molten metal flow, poor appearance, broken mold remaining pins, and occurrence of blisters. I checked the situation. Table 2 shows the obtained results. Casting conditions ・ Die casting machine 350 ton model cold chamber ・ Casting case ・ Materials ADC12 ・ Casting temperature 680 ℃ ・ Casting weight 440 g ・ Powder release agent supply device Commercial product ・ Powder release agent discharge 0.7g / 1 shot-500 Torr in cavity pressure when powder release agent is discharged-250 shots
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【表２】 [Table 2]
【００２９】表２に示したとおり、本発明に従う粉体離
型潤滑剤を用いた場合は、従来の無機物粉体自体の断
熱、保温効果を利用する粉体離型潤滑剤に比べて、湯流
れ不良、外観不良および離型力不足による型残りやピン
折れの発生を格段に低減することができた。As shown in Table 2, when the powder release lubricant according to the present invention is used, compared with the conventional powder release lubricant that utilizes the heat insulation and heat retaining effects of the inorganic powder itself, hot water is used. The occurrence of residual mold and pin breakage due to poor flow, poor appearance, and insufficient release force were significantly reduced.
【００３０】[0030]
【発明の効果】かくして、この発明に従い、粉体離型潤
滑剤の構成成分として「加熱昇温により熱分解して気体
を発生する無機物」を利用することによって、金型鋳造
におけるスリーブ内部の溶湯の保温性およびキャビティ
ー内部における溶湯の保温性・流動性を格段に向上させ
ることができる。As described above, according to the present invention, the molten metal inside the sleeve in the mold casting is utilized by utilizing the "inorganic substance which is thermally decomposed by heating to generate gas by heating" as a component of the powder release lubricant. And the heat retention and fluidity of the molten metal inside the cavity can be remarkably improved.
【００３１】また、スリーブ内部での溶湯の温度低下速
度が小さいため、従来のスリーブ用潤滑剤を使用した場
合よりも、射出完了までの溶湯温度を高く保持すること
ができる。同様に、キャビティー内部での溶湯の保温性
が高いため、溶湯の充填時間を長くすることができる。
その結果、金型キャビティー内への溶湯の射出スピード
（プランジャーチップ速度およびゲート速度）を、従来
の油性その他の潤滑剤を使用した場合に比べて最大１/1
0 程度まで低減することができ、いわゆる低速充填が可
能となる。ひいては、キャビティーへの溶湯充填中にお
ける大気巻き込みに起因した鋳造品の欠陥を１/10 以下
まで低減することができる。Further, since the temperature of the molten metal in the sleeve is lowered at a low rate, the temperature of the molten metal until the completion of injection can be kept higher than when a conventional lubricant for a sleeve is used. Similarly, since the heat retention of the molten metal inside the cavity is high, the filling time of the molten metal can be lengthened.
As a result, the injection speed (plunger tip speed and gate speed) of the molten metal into the mold cavity can be reduced by up to 1/1 compared to the case where conventional oil-based or other lubricants are used.
It can be reduced to about 0, and so-called low-speed filling becomes possible. As a result, it is possible to reduce defects of the cast product due to entrainment in the atmosphere during filling of the molten metal into the cavity to 1/10 or less.
【００３２】さらに、スリーブ中における溶湯の保温性
が向上し、破断チル層といわれる鋳造欠陥を減少できる
効果もある。すなわち、鋳造物が薄肉になるほど、溶湯
の凝固速度が破断チル層の生成の有無に顕著な影響を受
けることが知られているが、本発明によれば、破断チル
層が減少することで、これまでの水溶性の離型潤滑剤に
比べて、より一層薄肉で大型の鋳造品の製造が可能とな
る。Further, the heat retention of the molten metal in the sleeve is improved, and there is also an effect that casting defects called a broken chill layer can be reduced. That is, as the casting becomes thinner, it is known that the solidification rate of the molten metal is significantly affected by the presence or absence of the formation of the fractured chill layer, but according to the present invention, the fractured chill layer is reduced, Compared with the conventional water-soluble release lubricant, it is possible to produce a thinner and larger cast product.
【図１】 流動長測定装置を示した図である。FIG. 1 is a view showing a flow length measuring device.
【図２】 無機物粉体の熱分解温度を示した図である。FIG. 2 is a diagram showing a thermal decomposition temperature of an inorganic powder.
【図３】 各種の離型潤滑剤の流動長を比較して示した
図である。FIG. 3 is a diagram showing a comparison of flow lengths of various release lubricants.
１ 坩堝 ２ ストッパー ３ 温度計 ４ 溶融金属 ５ 流路 ６ ヒータ ７ のぞき窓 ８ ズーム顕微鏡 ９ ハイスピードＶＴＲ DESCRIPTION OF SYMBOLS 1 Crucible 2 Stopper 3 Thermometer 4 Molten metal 5 Flow path 6 Heater 7 Viewing window 8 Zoom microscope 9 High-speed VTR
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ１０Ｍ 103/00 Ｃ１０Ｍ 103/00 Ａ 103/02 103/02 Ｚ 105/24 105/24 107/04 107/04 107/06 107/06 129/40 129/40 143/02 143/02 143/04 143/04 // Ｃ１０Ｎ 10:02 Ｃ１０Ｎ 10:02 10:04 10:04 10:06 10:06 40:36 40:36 50:06 50:06 (72)発明者 吉田 誠 広島県東広島市鏡山２−360 ががら第二 宿舎２−406 (72)発明者 吉松 英之 岡山県岡山市芳賀5301 岡山県工業技術セ ンター内 (72)発明者 上野 覚 岡山県岡山市芳賀5301 岡山県工業技術セ ンター内 (72)発明者 澤井 敬己 兵庫県神戸市西区高塚台３丁目２番地45 花野商事株式会社内 Ｆターム(参考） 4E092 AA04 AA05 AA16 AA19 AA41 BA11 CA03 DA05 GA01 4H104 AA04A AA13A AA24A AA26A BB17A BB17C CA02A CA02C CA03A CA03C EA08A FA01 FA02 FA03 PA48 QA10 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) C10M 103/00 C10M 103/00 A 103/02 103/02 Z 105/24 105/24 107/04 107 / 04 107/06 107/06 129/40 129/40 143/02 143/02 143/04 143/04 // C10N 10:02 C10N 10:02 10:04 10:04 10:06 10:06 40:36 40:36 50:06 50:06 (72) Inventor Makoto Yoshida 2-360 Kagamiyama 2-Higashi-Hara-shi, Hiroshima Pref. 2-406 (72) Inventor Hideyuki Yoshimatsu 5301 Haga, Okayama-shi, Okayama Pref. Inside the center (72) Satoru Ueno 5301 Haga, Okayama City, Okayama Prefecture Inside the Technology Center, Okayama Prefecture (72) Takami Sawai 3-45 Takatsudai, Nishi-ku, Kobe-shi, Hyogo Prefecture F-term (inside Hanano Trading Co., Ltd.) Reference) 4E092 AA04 AA05 AA16 AA19 AA41 BA11 CA03 DA05 GA01 4H104 AA04A AA13A AA24A AA26A BB17A BB17C CA 02A CA02C CA03A CA03C EA08A FA01 FA02 FA03 PA48 QA10
Claims (6)
体を発生する無機物粉体からなることを特徴とする金型
鋳造用の粉体離型潤滑剤。1. A powder release lubricant for mold casting, comprising an inorganic powder which generates a gas by being thermally decomposed by contact with a molten metal.
体を発生する熱分解温度が 100〜1000℃の範囲にある、
無機物粉体を用いること特徴とする請求項１記載の金型
鋳造用の粉体離型潤滑剤。2. A pyrolysis temperature at which a gas is generated by thermal decomposition upon contact with a molten metal is in a range of 100 to 1000 ° C.
The powder release lubricant for mold casting according to claim 1, wherein an inorganic powder is used.
は生成物として無機物を生成する無機物粉体を用いるこ
とを特徴とする請求項１または２記載の金型鋳造用の粉
体離型潤滑剤。3. The powder release lubrication for mold casting according to claim 1, wherein an inorganic powder which generates an inorganic substance as a decomposition product or a product even after gas generation by thermal decomposition is used. Agent.
少なくとも一種からなる無機物粉体中に、潤滑性の向上
剤としてグラファイトおよび／または窒化硼素を50mass
％以下で配合したことを特徴とする請求項１，２または
３記載の金型鋳造用の粉体離型潤滑剤。4. An inorganic powder comprising at least one selected from hydroxides and carbonates, wherein graphite and / or boron nitride is added as a lubricity improver to 50 mass%.
The powder release lubricant for mold casting according to claim 1, 2 or 3, wherein the lubricant is blended in an amount of not more than 10%.
向上剤として有機物粉体を50mass％以下で配合したこと
を特徴とする請求項１〜４のいずれかに記載の金型鋳造
用の粉体離型潤滑剤。5. The mold casting mold according to claim 1, wherein an organic powder as an improver of adhesion and lubricity is blended in the inorganic powder at 50 mass% or less. Powder release lubricant.
は脂肪酸金属塩のうちから選んだ少なくとも一種である
請求項５記載の金型鋳造用の粉体離型潤滑剤。6. The powder release lubricant for mold casting according to claim 5, wherein the powdery organic substance is at least one selected from a synthetic polymer compound and a fatty acid metal salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000291412A JP3487553B2 (en) | 2000-09-26 | 2000-09-26 | Powder release lubricant for mold casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000291412A JP3487553B2 (en) | 2000-09-26 | 2000-09-26 | Powder release lubricant for mold casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002097481A true JP2002097481A (en) | 2002-04-02 |
| JP3487553B2 JP3487553B2 (en) | 2004-01-19 |
Family
ID=18774486
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000291412A Expired - Fee Related JP3487553B2 (en) | 2000-09-26 | 2000-09-26 | Powder release lubricant for mold casting |
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| Country | Link |
|---|---|
| JP (1) | JP3487553B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009160629A (en) * | 2008-01-09 | 2009-07-23 | Hitachi Powdered Metals Co Ltd | Release agent for mold casting |
| JP2012148328A (en) * | 2011-01-20 | 2012-08-09 | Toyota Motor Corp | Casting method, and heating device |
| 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 |
-
2000
- 2000-09-26 JP JP2000291412A patent/JP3487553B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009160629A (en) * | 2008-01-09 | 2009-07-23 | Hitachi Powdered Metals Co Ltd | Release agent for mold casting |
| JP2012148328A (en) * | 2011-01-20 | 2012-08-09 | Toyota Motor Corp | Casting method, and heating device |
| 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 |
| JP5972393B2 (en) * | 2012-11-19 | 2016-08-17 | 新東工業株式会社 | Mold sand and molding method of sand mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3487553B2 (en) | 2004-01-19 |
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