JPH06210422A - Method for forming homogeneous structure of semi-solidifying metal - Google Patents
Method for forming homogeneous structure of semi-solidifying metalInfo
- Publication number
- JPH06210422A JPH06210422A JP1947993A JP1947993A JPH06210422A JP H06210422 A JPH06210422 A JP H06210422A JP 1947993 A JP1947993 A JP 1947993A JP 1947993 A JP1947993 A JP 1947993A JP H06210422 A JPH06210422 A JP H06210422A
- Authority
- JP
- Japan
- Prior art keywords
- solid
- liquid
- temperature
- die
- kcal
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、固液共存状態の素材
を金型へ供給して成形を行う方法に関するもので、半凝
固金属の均一組織化成形方法を提案するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying a raw material in a solid-liquid coexisting state to a die for forming, and proposes a method of forming a uniform texture of semi-solidified metal.
【０００２】固液共存状態からのダイカスト、スクイズ
キャストなどでは、素材をその一部が溶融する温度まで
加熱して金型へ供給し成形する。このような素材はその
一部が溶融した状態では網状に連結した固相の隙間に液
相が保持され全体として固体状で加熱した位置から金型
まで移動させることができ、金型により大きな力がかけ
られると網状の固相は破壊して細かい破片となり全体が
液状となり金型キャビティ内に充満させることができ
る。そしてこの網状の固相が破壊された固液混相状態で
は液相と同様の流動性を示すため複雑な形状の金型にも
適用できる。In die casting, squeeze casting and the like from a solid-liquid coexisting state, a material is heated to a temperature at which a part thereof is melted and supplied to a mold to be molded. When a part of such a material is melted, the liquid phase is held in the gap between the solid phases connected in a net-like shape, and it can move from the heated position to the mold as a whole. When applied, the reticulated solid phase is broken into fine pieces that become liquid and can fill the mold cavity. In the solid-liquid mixed phase state in which the reticulated solid phase is destroyed, the same fluidity as that of the liquid phase is exhibited, so that it can be applied to a mold having a complicated shape.
【０００３】このような固液共存域からの成形は、溶湯
からの成形にくらべ、 溶湯より温度が低く、凝固潜熱も少ない。したがっ
て、金型に対する熱負荷が少なく、溶湯では金型の耐熱
性の制約上工業的にはダイカストできない鉄系材料のダ
イカストが可能である。また、凝固に要する時間が少な
く生産性が向上する。Molding from such a solid-liquid coexisting region has a lower temperature and less solidification latent heat than the melt, as compared with molding from the melt. Therefore, the heat load on the mold is small, and it is possible to die-cast an iron-based material that cannot be industrially die-cast with molten metal due to the heat resistance of the die. In addition, the time required for solidification is small and the productivity is improved.
【０００４】 素材の一部が固相であるため凝固収縮
が少なく、成形品の寸法精度が向上する。などの特長を
有し、そのほかにも、介在物、内部欠陥などの減少によ
る材質特性の向上、歩止りの向上などもある。Since part of the material is a solid phase, solidification shrinkage is small, and the dimensional accuracy of the molded product is improved. In addition to these features, it also improves the material properties and yield by reducing inclusions and internal defects.
【０００５】したがって、固液共存域からの鋳造は種々
の長所を有していることから、その製造技術の確立が望
まれている。Therefore, since casting from the solid-liquid coexistence region has various advantages, it is desired to establish a manufacturing technique therefor.
【０００６】[0006]
【従来の技術】固液共存状態の素材を金型内へ供給し成
形すると表面近傍には固相がなく液相のみとなり、内部
は固相と液相が入交じった状態となる現象がある。この
現象は、ダイカスト、スクイズキャスト、及びロール鋳
造等、金型やロールなどを用いる半凝固金属の成形加工
において見られる。2. Description of the Related Art When a material in a solid-liquid coexisting state is supplied into a mold and molded, there is a phenomenon that there is no solid phase in the vicinity of the surface but only a liquid phase, and there is a mixture of solid phase and liquid phase inside. . This phenomenon is observed in the forming process of semi-solidified metal using a die or roll, such as die casting, squeeze casting, and roll casting.
【０００７】一方、多元系の合金では固液共存状態での
固相と液相では合金成分の含有量が異なるのが通常であ
る。したがって、半凝固金属から製造される成形品は、
液相のみが凝固した表層部と固液混相状態で凝固した内
部では合金成分の含有量が異なったものになる。On the other hand, in multi-component alloys, the contents of alloy components are usually different between the solid phase and the liquid phase in the solid-liquid coexisting state. Therefore, molded articles made from semi-solid metal
The content of the alloy component is different between the surface layer portion where only the liquid phase is solidified and the inside where the solid phase is solidified.
【０００８】[0008]
【発明が解決しようとする課題】この発明は、前記した
問題点を有利に解決し、固液混相状態における固相と液
相とが一様に分散した状態で凝固した均一組織化した半
凝固金属の成形方法を提案することを目的とする。DISCLOSURE OF THE INVENTION The present invention advantageously solves the above-mentioned problems, and a solidified and semi-solidified solidified state in which a solid phase and a liquid phase in a solid-liquid mixed phase are uniformly dispersed. The purpose is to propose a metal forming method.
【０００９】[0009]
【課題を解決するための手段】種々検討の結果、金型の
温度が組織の均一化に大きく影響することを見出し、こ
の発明を達成したものである。As a result of various studies, the inventors have found that the temperature of the mold has a great influence on the homogenization of the structure, and achieved the present invention.
【００１０】すなわち、この発明の要旨は、固液共存状
態の素材を下記式に示す温度（ＴK) に予熱保持した金
型へ供給して成形を行い、固相粒子が液相中への均一分
散を経る凝固制御を施すことを特徴とする半凝固金属の
均一組織化成形方法。That is, the gist of the present invention is to supply a raw material in a solid-liquid coexisting state to a mold preheated and maintained at a temperature (T K ) shown in the following formula to perform molding, and to obtain solid phase particles in a liquid phase. A uniform structured forming method for semi-solidified metal, characterized by performing solidification control through uniform dispersion.
【数２】 である。[Equation 2] Is.
【００１１】[0011]
【作用】この発明に至った経緯とその作用について述べ
る。金型に固液共存域の素材を供給して成形する際、冷
却速度が早いと、液相のみの成形体表層部が急速に冷却
凝固し、成形体の表層部は液相のみが凝固した組織とな
る。一方、その内部は固液混相の凝固した組織であるこ
とから、表層部と内部の組織は不均一なものになる。The background of the invention and its operation will be described. When the material in the solid-liquid coexistence region is supplied to the die for molding, if the cooling rate is fast, the surface layer of the molded body with only the liquid phase rapidly cools and solidifies, and only the liquid phase solidifies with the surface layer of the molded body. Become an organization. On the other hand, since the inside is a solid-liquid mixed phase solidified structure, the surface layer and the internal structure are non-uniform.
【００１２】このような問題を解決するため，金型内成
形体表層部の凝固を遅らせることを検討した。その結
果、固液共存状態の素材供給前に金型を予熱しておき、
金型と固液混相状態の材料が接したときの界面温度を材
料の固相線温度以上になるようにして、材料が金型に接
してから凝固するまでの時間を長くすることにより、こ
の時間内で内部の固相の一部が表層部に移動し全体が均
一な固液混相状態となったのち凝固する、すなわち均一
化した組織が得られることを見出した。In order to solve such a problem, it was studied to delay the solidification of the surface layer of the molded body in the mold. As a result, the mold is preheated before the material is supplied in the solid-liquid coexisting state,
By making the interface temperature when the mold and the material in the solid-liquid mixed phase contact each other to be equal to or higher than the solidus temperature of the material, and prolonging the time from the contact with the mold to the solidification, It has been found that a part of the solid phase inside moves to the surface layer within a time period and the whole becomes a uniform solid-liquid mixed state and then solidifies, that is, a uniform structure is obtained.
【００１３】そして上記の金型温度（ＴK ) は伝熱計算
から〔数２〕のようになる。The above mold temperature (T K ) is given by [Equation 2] from the heat transfer calculation.
【００１４】したがって、金型を上記式に示す温度（Ｔ
K ) に予熱して、固液共存状態の素材の成形を行えば、
材料が金型に充満後、表層部への固相粒の移動があって
全体が均一化した組織、すなわち均一化した成分組成の
成形品が得られることになる。Therefore, the temperature of the mold (T
If you preheat to K ) and mold the material in the solid-liquid coexistence state,
After the material is filled in the mold, the solid phase particles move to the surface layer portion, so that the entire structure becomes uniform, that is, a molded product having a uniform component composition is obtained.
【００１５】[0015]
【実施例】4.5 mass％ Cu のAl合金を 626℃ (固相率：
0.7 ）の固液共存域に加熱し、図１に示す寸法諸元のＳ
ＫＤ61の金型へ供給して成形し、その成形状況及び成形
品の組織を調査した。Example: An Al alloy containing 4.5 mass% Cu at 626 ° C (solid phase ratio:
0.7) is heated to the solid-liquid coexistence region, and S of the dimension specifications shown in Fig. 1
It was supplied to a mold of KD61 and molded, and the molding state and the structure of the molded product were investigated.
【００１６】ここに図１において、１は成形品、２は上
金型、３は下金型であり、下金型３に素材を供給したの
ち直ちに上金型２を押込み成形品１を得る。In FIG. 1, 1 is a molded product, 2 is an upper mold, 3 is a lower mold, and after the raw material is supplied to the lower mold 3, the upper mold 2 is immediately pushed to obtain a molded product 1. .
【００１７】上記成形条件としては、上金型２の押込み
速度及び金型（上下金型２及び３）の温度を変えて行っ
たもので、これらの条件と調査結果を表１にまとめて示
す。As the molding conditions, the pushing speed of the upper mold 2 and the temperature of the molds (upper and lower molds 2 and 3) were changed, and these conditions and the survey results are summarized in Table 1. .
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１から明らかなように試料 No.１〜３の
この発明の適合例は、材料は金型キャビティ内へ充満
し、均一化した組織の成形品が得られているのに対し、
試料 No.４及び５の比較例では表層部に固液共存状態に
おいて固体であった固相粒の組織は見られなく液相の凝
固組織のみで表層部と内部とが不均一な組織となってい
る。As is apparent from Table 1, in the conforming examples of the present invention of Sample Nos. 1 to 3, the material filled the mold cavity, and a molded product having a uniform structure was obtained.
In the comparative examples of Sample Nos. 4 and 5, the solid phase grain structure that was solid in the solid-liquid coexistence state was not found in the surface layer part, and only the solidification structure of the liquid phase was present and the surface layer part and the inside were nonuniform. ing.
【００２０】また表１に示した試料 No.２のこの発明の
適合例と試料 No.４の比較例の成形部品の金属組織写真
をそれぞれ図２及び図３に示す。なお、これらの金属組
織写真において白く見える部分が固液共存状態では固相
であった部分（銅の含有量が少ない）で、黒く見える部
分が固液共存状態では液相であった部分（銅の含有量が
多い）である。これらの写真からも比較例では不均一な
組織を示しているのに対し、適合例では均一化した組織
を示していることがわかる。2 and 3 are photographs of the metallographic structures of the molded parts of the sample No. 2 of the present invention and the comparative example of sample No. 4 shown in Table 1, respectively. In these metallographic photographs, the white parts are solid phases in the solid-liquid coexistence state (the copper content is small), and the black parts are liquid phases in the solid-liquid coexistence state (copper content). Is high). It can be seen from these photographs that the comparative example shows a non-uniform structure, while the matching example shows a uniform structure.
【００２１】[0021]
【発明の効果】この発明は、固液共存状態の素材を金型
へ供給して成形する際、金型の予熱温度を限定すること
により均一化した組織の成形品を得るものであって、半
凝固金属の成形方法とし有利に活用できる。Industrial Applicability The present invention is to obtain a molded product having a uniform structure by limiting the preheating temperature of the mold when the solid-liquid coexisting material is supplied to the mold for molding. It can be advantageously used as a method for forming semi-solid metal.
【図１】実施例で用いた金型の寸法諸元を示す説明図で
ある。FIG. 1 is an explanatory diagram showing dimensional specifications of a mold used in Examples.
【図２】この発明の適合例の金属組織写真である。FIG. 2 is a photograph of a metal structure of a conforming example of the present invention.
【図３】比較例の金属組織写真である。FIG. 3 is a photograph of a metal structure of a comparative example.
１ 成形品 ２ 上金型 ３ 下金型 1 Molded product 2 Upper mold 3 Lower mold
フロントページの続き (72)発明者 安堂 優一 千葉県千葉市中央区川崎町１番地 株式会 社レオテック内Front page continuation (72) Inventor Yuichi Ando 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Stock company Leotech
Claims (1)
（ＴK ) に予熱保持した金型へ供給して成形を行い、固
相粒子が液相中への均一分散を経る凝固制御を施すこと
を特徴とする半凝固金属の均一組織化成形方法。 【数１】 1. A solidification control in which a solid-liquid coexisting material is supplied to a mold preheated and maintained at a temperature (T K ) shown in the following formula for molding, and solid phase particles undergo uniform dispersion in a liquid phase. A uniform structured forming method for semi-solidified metal, comprising: [Equation 1]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1947993A JPH06210422A (en) | 1993-01-13 | 1993-01-13 | Method for forming homogeneous structure of semi-solidifying metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1947993A JPH06210422A (en) | 1993-01-13 | 1993-01-13 | Method for forming homogeneous structure of semi-solidifying metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06210422A true JPH06210422A (en) | 1994-08-02 |
Family
ID=12000481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1947993A Pending JPH06210422A (en) | 1993-01-13 | 1993-01-13 | Method for forming homogeneous structure of semi-solidifying metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06210422A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010269329A (en) * | 2009-05-20 | 2010-12-02 | Olympus Corp | Method and apparatus for forming amorphous alloy |
| WO2015053373A1 (en) * | 2013-10-09 | 2015-04-16 | 国立大学法人東北大学 | Semisolid casting and forging device and method, and cast and forged product |
-
1993
- 1993-01-13 JP JP1947993A patent/JPH06210422A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010269329A (en) * | 2009-05-20 | 2010-12-02 | Olympus Corp | Method and apparatus for forming amorphous alloy |
| WO2015053373A1 (en) * | 2013-10-09 | 2015-04-16 | 国立大学法人東北大学 | Semisolid casting and forging device and method, and cast and forged product |
| US20160228946A1 (en) * | 2013-10-09 | 2016-08-11 | Tohoku University | Semisolid casting and forging device and method, and cast and forged product |
| JPWO2015053373A1 (en) * | 2013-10-09 | 2017-03-09 | 国立大学法人東北大学 | Semi-solid cast forging apparatus and method and cast forged product |
| US10118219B2 (en) | 2013-10-09 | 2018-11-06 | Tohoku University | Semisolid casting/forging apparatus and method as well as a cast and forged product |
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