JP3096176B2 - Solid-liquid coexistence zone die casting method of white cast iron - Google Patents
Solid-liquid coexistence zone die casting method of white cast ironInfo
- Publication number
- JP3096176B2 JP3096176B2 JP04281072A JP28107292A JP3096176B2 JP 3096176 B2 JP3096176 B2 JP 3096176B2 JP 04281072 A JP04281072 A JP 04281072A JP 28107292 A JP28107292 A JP 28107292A JP 3096176 B2 JP3096176 B2 JP 3096176B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- solid
- white cast
- die casting
- casting method
- 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
- Powder Metallurgy (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は白鋳鉄の好適な固液共
存域でのダイカスト法を提案するものである。白鋳鉄
は、耐摩耗性向上のための合金成分を添加しなくても耐
摩耗性に優れた材料であり、耐摩耗性が要求される部品
に用いることができれば非常に有用である。しかしなが
ら、白鋳鉄は被削性が悪く、切削加工により部品を削り
出すことが困難であり、耐摩耗性が要求される複雑な部
品、たとえば歯車やカムなどには極くまれにしか用いら
れていない。したがって、被削性の良否にかかわらず複
雑な形状の部品に成形できるダイカスト法が適用できれ
ば非常に有利であるが、白鋳鉄など鉄系の材料は融点が
高くその溶湯温度に耐える耐熱性の金型材料はない。BACKGROUND OF THE INVENTION The present invention proposes a die casting method for white cast iron in a preferable solid-liquid coexistence region. White cast iron is a material having excellent wear resistance without adding an alloy component for improving wear resistance, and is very useful if it can be used for parts requiring wear resistance. However, white cast iron has poor machinability, it is difficult to cut out parts by cutting, and it is rarely used for complicated parts requiring wear resistance, such as gears and cams. Absent. Therefore, it would be very advantageous to apply the die casting method, which can form parts with complicated shapes regardless of the machinability. However, iron-based materials such as white cast iron have a high melting point and are heat resistant metals that can withstand the temperature of the molten metal. There is no mold material.
【０００２】そこで、白鋳鉄の工業的なダイカストは、
溶湯より温度及び潜熱の低い固液共存域でのダイカスト
のみに可能性があり、その工業化が望まれている。Therefore, industrial die casting of white cast iron is
There is a possibility only for die casting in a solid-liquid coexistence region having a lower temperature and latent heat than the molten metal, and its industrialization is desired.
【０００３】[0003]
【従来の技術】これまでに、白鋳鉄の固液共存域のダイ
カストとしては、粒状の組織をもつ白鋳鉄素材を用いる
方法が知られている。2. Description of the Related Art Heretofore, a method using a white cast iron material having a granular structure has been known as die casting in a solid-liquid coexistence region of white cast iron.
【０００４】この粒状組織の素材は、適当な固相率（固
相が20％〜70％）になる温度に加熱すると粒状の固相が
相互に局部的につながり、その間隙に液相が含まれた状
態になる。このような状態では、全体として固体と同様
の挙動をするため、加熱中に溶け落ちることがなく、ま
た加熱位置から金型までの移送が容易になる。そして、
このような固液共存域に加熱した素材を射出すると、粒
状の固相相互の局部的なつながりは破壊され粒状の固相
が液相に懸濁し、全体として液体と同様な挙動をするよ
うになり、金型の隅々まで充満させることを容易にする
ものである。When the material of this granular structure is heated to a temperature at which an appropriate solid phase ratio (solid phase is 20% to 70%), the granular solid phases are locally connected to each other, and the liquid phase is contained in the gaps. It will be in a state where it was lost. In such a state, it behaves in the same manner as a solid as a whole, so that it does not melt off during heating and is easily transported from the heating position to the mold. And
When a heated material is injected into such a solid-liquid coexistence area, the local connection between the granular solid phases is broken, and the granular solid phase is suspended in the liquid phase, so that it behaves like a liquid as a whole. This makes it easy to fill the mold with every corner.
【０００５】しかしながら、粒状組織の白鋳鉄は下記の
いずれかの方法で得られるものの、それぞれ下記する問
題がある。 ・ 溶湯を攪拌しながら凝固させる。 問題点：攪拌により空気及び攪拌子の破片などの非金属
介在物の巻き込みがある。 ・ 静止凝固させた鋳塊を塑性加工し微細な繊維状組織
にしたのち熱処理する。 問題点：塑性加工能が小さいため、塑性加工により繊維
状組織にすることが困難である。 ・ 溶湯を融点直上の低温で鋳込む。 問題点：粒状化可能な温度範囲が狭いため工業的にこれ
を行うことは困難である。 ・ 溶湯に接種剤を添加して鋳込む。 問題点：白鋳鉄では粒状化のための適当な接種剤は現在
までのところない。However, white cast iron having a granular structure can be obtained by any of the following methods, but has the following problems.・ Solidify the molten metal with stirring. Problem: Non-metallic inclusions such as air and fragments of the stirrer are entrained by stirring.・ The ingot that has been statically solidified is plastically processed into a fine fibrous structure and then heat-treated. Problem: Since the plastic working ability is small, it is difficult to obtain a fibrous structure by plastic working.・ Cast the molten metal at a low temperature just above the melting point. Problem: It is difficult to do this industrially due to the narrow temperature range that can be granulated.・ Add the inoculant to the molten metal and cast. PROBLEM: There is currently no suitable inoculant for granulation in white cast iron.
【０００６】[0006]
【発明が解決しようとする課題】前記したように、粒状
組織を有する白鋳鉄を素材とする固液共存域のダイスト
では、粒状組織の素材を製造する方法に種々問題があ
る。As described above, in a solid-liquid coexisting region die made of white cast iron having a granular structure, there are various problems in a method for producing a material having a granular structure.
【０００７】一方、通常の静止凝固させた白鋳鉄は樹枝
状の組織を有している。この白鋳鉄素材を固液共存域に
加熱し射出すると、この樹枝状の結晶は互いに絡み合い
大きな集団として移動するため、金型内にかたまりのま
ま残ったり、金型内の狭い部分や湾曲した部分でつか
え、それより先には液相のみが送給されて金型内に充満
されることになり、均一な組織の部品すなわち製品が得
られないという問題がある。On the other hand, ordinary statically solidified white cast iron has a dendritic structure. When this white cast iron material is heated and injected into the solid-liquid coexistence area, the dendritic crystals are entangled with each other and move as a large group, so they remain in the mold as a lump or narrow or curved parts in the mold. Before that, only the liquid phase is fed and filled in the mold, and there is a problem that a part having a uniform structure, that is, a product cannot be obtained.
【０００８】したがって、この発明は粒状組織の白鋳鉄
を素材とする場合はもちろんのこと、製造容易な通常の
樹枝状組織の白鋳鉄を素材とする場合であっても均一な
組織の製品が得られる好適な固液共存域でのダイカスト
法を提案することを目的とする。Therefore, the present invention can provide a product having a uniform structure not only when using white cast iron having a granular structure as a material, but also when using white cast iron having a normal dendritic structure which is easy to manufacture. It is an object of the invention to propose a suitable die-casting method in a solid-liquid coexistence region.
【０００９】[0009]
【課題を解決するための手段】この発明は、種々実験検
討の結果、プランジャチップの加圧面積とゲートの開口
面積との比が製品の組織の均一性に大きく影響すること
を見出したことによるものである。According to the present invention, as a result of various experimental studies, it has been found that the ratio between the pressing area of the plunger tip and the opening area of the gate greatly affects the uniformity of the structure of the product. Things.
【００１０】すなわち、この発明の要旨は、白鋳鉄の固
液共存域でのダイカストにおいて、白鋳鉄素材を、固液
共存域まで加熱したのち、プランジャにより、プランジ
ャチップの加圧面積に対し1/10以下の面積で開口するゲ
ートを有する金型内へ射出することを特徴とする白鋳鉄
の固液共存域ダイカスト法である。That is, the gist of the present invention is that in white casting iron in die-casting in a solid-liquid coexisting area, the white cast iron material is heated to a solid-liquid coexisting area, and then, by a plunger, the pressure of the plunger chip is reduced by 1 /. This is a die casting method in which a solid-liquid coexistence region of white cast iron is injected into a mold having a gate opening with an area of 10 or less.
【００１１】[0011]
【作用】この発明の作用を以下に述べる。製造容易な樹
枝状の組織を有する白鋳鉄を素材として固液共存域での
ダイカストを行う場合でも、プランジャチップの加圧面
積に対しゲートの開口面積を1/10以下にすると、樹枝状
結晶はゲート部で破壊されて孤立した破片となるため、
金型内に樹枝状結晶のかたまりができることはなく、か
つ金型内の狭い部分や湾曲した部分を上記破片がつかえ
ることなく容易に通過できるようになる。したがって、
均一な組織の製品を得ることができる。The operation of the present invention will be described below. Even when performing die-casting in a solid-liquid coexistence area using white cast iron having a dendritic structure that is easy to manufacture, if the gate opening area is set to 1/10 or less of the pressurized area of the plunger tip, the dendritic crystal will Since it is destroyed at the gate and becomes isolated fragments,
No dendritic crystals are formed in the mold, and the debris can easily pass through the narrow or curved portion of the mold without being caught. Therefore,
A product with a uniform texture can be obtained.
【００１２】[0012]
【実施例】Ｃ：2.5 wt％、Si：0.5 wt％及びMn：0.5 wt
％を含有する白鋳鉄を素材とし、この白鋳鉄素材として
は、樹枝状組織を有する静止凝固材と、固相率0.2 まで
攪拌しながら冷却し凝固させた粒状組織を有する攪拌凝
固材とを用い、下記の条件で固液共存域でのダイカスト
を行い得られた製品の組織を調査した。[Example] C: 2.5 wt%, Si: 0.5 wt% and Mn: 0.5 wt%
% Of a white cast iron material. As the white cast iron material, a static solidified material having a dendritic structure and a stirred solidified material having a granular structure cooled and solidified while stirring to a solid fraction of 0.2 are used. The structure of the product obtained by die-casting in the solid-liquid coexisting region under the following conditions was investigated.
【００１３】プランジャチップ径：62mm 射出速度：２ｍ／Ｓ 射出圧力：1000 kgf／cm2 素材温度：1238℃（固相率：0.5 ） ゲート開口寸法：60mm×ｔmm ｔ：１，２，５，６，10 製品寸法：80mm×80mm×10mmPlunger tip diameter: 62 mm Injection speed: 2 m / S Injection pressure: 1000 kgf / cm 2 Material temperature: 1238 ° C. (solid fraction: 0.5) Gate opening size: 60 mm × tmm t: 1, 2, 5, 6 、 10 Product dimensions: 80mm × 80mm × 10mm
【００１４】ここに図１(a), (b)はこの実施例で用いた
ゲート及び製品の形状寸法を示す説明図である。この図
において、１は製品、２はゲート、３は湯道、４はビス
ケットである。これらの調査結果をまとめて表１に示
す。FIGS. 1A and 1B are explanatory views showing the dimensions of the gate and the product used in this embodiment. In this figure, 1 is a product, 2 is a gate, 3 is a runner, and 4 is a biscuit. Table 1 summarizes the results of these investigations.
【００１５】[0015]
【表１】 [Table 1]
【００１６】表１から明らかなように、この発明に適合
する試料No１，２，３及び６の適合例は、いずれも均一
な組織の製品が得られているが、ゲート開口が大きい試
料No４及び５の比較例では均一な組織の製品は得られな
い。また、試料No６の素材に攪拌凝固材を用いた適合例
の製品には空孔が見られ素材の欠陥が製品にあらわれて
いることを示している。したがってこの発明の適用に
は、素材として静止凝固材を用いる方が製品品質上好ま
しい。As is clear from Table 1, in the case of the samples Nos. 1, 2, 3 and 6 which conform to the present invention, products having a uniform structure are obtained, but the samples No. 4 and In Comparative Example 5, a product having a uniform structure cannot be obtained. Further, in the product of the adaptation example in which the stirring and solidifying material was used as the material of sample No. 6, voids were observed, indicating that defects in the material appeared in the product. Therefore, to apply the present invention, it is preferable to use a static solidified material as a material in terms of product quality.
【００１７】つぎに、上記の静止凝固した白鋳鉄素材の
顕微鏡金属組織写真を図２に、適合例試料No２の製品の
顕微鏡金属組織写真を図３に示す。図２では、静止凝固
した素材の組織は樹枝状組織であることを示し、図３で
は、この発明を適用して製造された製品は均一な組織に
なることを示している。Next, FIG. 2 shows a microscopic metallographic photograph of the above-mentioned statically solidified white cast iron material, and FIG. 3 shows a microscopic metallographic photograph of the product of sample No. 2 of the conforming example. FIG. 2 shows that the structure of the statically solidified material is a dendritic structure, and FIG. 3 shows that the product manufactured by applying the present invention has a uniform structure.
【００１８】[0018]
【発明の効果】この発明は、固液共存域まで加熱した白
鋳鉄素材を、プランジャにより、プランジャチップの加
圧面積に対し1/10以下の面積で開口するゲートを有する
金型内へ射出するものであって、この発明によれば、製
造容易な樹枝状組織を有する白鋳鉄素材を用いても複雑
な形状の均一な組織の製品を得ることができ、工業的な
白鋳鉄のダイカストを可能にする。According to the present invention, a white cast iron material heated to a solid-liquid coexistence area is injected by a plunger into a mold having a gate opening with an area of 1/10 or less of a pressing area of a plunger tip. According to the present invention, it is possible to obtain a product having a uniform structure with a complicated shape even using a white cast iron material having a dendritic structure that is easy to manufacture, and it is possible to industrially cast white iron. To
【図１】(a) は実施例で用いたゲート及び製品の形状寸
法を示す説明図である。(b) は実施例で用いたゲート及
び製品の形状寸法を示す説明図である。FIG. 1A is an explanatory view showing the shape and dimensions of a gate and a product used in an example. (b) is an explanatory view showing the shape and dimensions of the gate and the product used in the example.
【図２】静止凝固した白鋳鉄素材の顕微鏡金属組織写真
である。FIG. 2 is a microscopic metallographic photograph of a statically solidified white cast iron material.
【図３】製品の顕微鏡金属組織写真である。FIG. 3 is a microscopic metallographic photograph of a product.
１ 製品 ２ ゲート ３ 湯道 ４ ビスケット 1 product 2 gate 3 runner 4 biscuit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 17/00 - 17/22 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B22D 17/00-17/22
Claims (1)
いて、 白鋳鉄素材を、固液共存域まで加熱したのち、プランジ
ャにより、プランジャチップの加圧面積に対し1/10以下
の面積で開口するゲートを有する金型内へ射出すること
を特徴とする白鋳鉄の固液共存域ダイカスト法。In a die casting of a white cast iron in a solid-liquid coexisting area, after a white cast iron material is heated to a solid-liquid coexisting area, an opening is formed by a plunger in an area of 1/10 or less of a pressurized area of a plunger tip. A solid-liquid coexisting zone die casting method of white cast iron, wherein the die casting is performed into a mold having a gate to perform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04281072A JP3096176B2 (en) | 1992-09-28 | 1992-09-28 | Solid-liquid coexistence zone die casting method of white cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04281072A JP3096176B2 (en) | 1992-09-28 | 1992-09-28 | Solid-liquid coexistence zone die casting method of white cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06106321A JPH06106321A (en) | 1994-04-19 |
| JP3096176B2 true JP3096176B2 (en) | 2000-10-10 |
Family
ID=17633932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04281072A Expired - Fee Related JP3096176B2 (en) | 1992-09-28 | 1992-09-28 | Solid-liquid coexistence zone die casting method of white cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3096176B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5531261A (en) * | 1994-01-13 | 1996-07-02 | Rheo-Technology, Ltd. | Process for diecasting graphite cast iron at solid-liquid coexisting state |
| GB2375354B (en) * | 1998-07-14 | 2003-01-15 | Honda Motor Co Ltd | Process for heating Fe-based alloy material for thixocasting |
| JP2010131635A (en) * | 2008-12-04 | 2010-06-17 | Nippon Steel Corp | Die-cast molding method for iron and die-cast molded body |
| JP5453480B2 (en) * | 2012-04-10 | 2014-03-26 | 日本鋳造株式会社 | Cast iron billet for thixocasting and manufacturing method thereof |
-
1992
- 1992-09-28 JP JP04281072A patent/JP3096176B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06106321A (en) | 1994-04-19 |
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