JP3070295B2 - Mold for centrifugal casting of Ti or Ti alloy casting - Google Patents
Mold for centrifugal casting of Ti or Ti alloy castingInfo
- Publication number
- JP3070295B2 JP3070295B2 JP4260270A JP26027092A JP3070295B2 JP 3070295 B2 JP3070295 B2 JP 3070295B2 JP 4260270 A JP4260270 A JP 4260270A JP 26027092 A JP26027092 A JP 26027092A JP 3070295 B2 JP3070295 B2 JP 3070295B2
- Authority
- JP
- Japan
- Prior art keywords
- casting
- mold
- cavity
- alloy
- centrifugal
- 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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば自動車用エンジ
ンバルブのように棒体の先端に大径部が一体的に形成さ
れてなるＴｉまたはＴｉ合金製の鋳物を遠心鋳造する際
に用いる遠心鋳造用金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal casting used for centrifugally casting a Ti or Ti alloy casting having a large diameter portion integrally formed at the tip of a rod, such as an engine valve for an automobile. The present invention relates to a casting mold.
【０００２】[0002]
【従来の技術】一般に、ＴｉまたはＴｉ合金は高融点で
かつ活性を有するために、ＴｉまたはＴｉ合金製の製品
を作る場合、セラミックス製の鋳型を用いて鋳造するよ
うにしている。この場合、比較的小型の部品、例えばエ
ンジンで用いられるバルブ等をＴｉまたはＴｉ合金で多
数作る方法の一つに、生産性を上げるため、複数の成形
用キャビティを有するセラミックス製の鋳型をツリー状
に形成し、この鋳型を水平方向に自転させて、鋳型の内
部に注入した溶湯に遠心力を与えてキャビティの隅々に
まで行きわたらせて作る遠心鋳造法がある。そして、こ
の方法により、枝の先端部分に多数のバルブ等が成形さ
れてなるツリー状の鋳物中間品が得られるが、該鋳物中
間品を鋳造後取り出すには、その都度外側に存するセラ
ミックス製の鋳型を破棄する必要があるため、無駄が多
くその改善が望まれていた。2. Description of the Related Art Generally, Ti or a Ti alloy has a high melting point and an activity. Therefore, when a product made of Ti or a Ti alloy is produced, it is cast using a ceramic mold. In this case, in order to increase productivity, a ceramic mold having a plurality of molding cavities is formed in a tree shape in order to increase productivity. There is a centrifugal casting method in which the mold is rotated in the horizontal direction, and a centrifugal force is applied to the molten metal poured into the mold to spread the molten metal to every corner of the cavity. According to this method, a tree-shaped casting intermediate product obtained by molding a number of valves or the like at the tip of the branch is obtained. Since the mold needs to be discarded, there is much waste and improvement has been desired.
【０００３】そこで、本発明者等は、セラミックス製の
鋳型に代わり、何回でも鋳込みが行える銅合金製の金型
を用いてＴｉまたはＴｉ合金鋳物を鋳造することを検討
し、新たなＴｉまたはＴｉ合金鋳物の遠心鋳造法を案出
し、先に特願平２ー３９３６０号（特開平３−２４３２
６５号）として提案した。Therefore, the present inventors have studied the casting of a Ti or Ti alloy casting by using a copper alloy mold that can be cast as many times as possible, instead of a ceramic mold. A method of centrifugal casting of a Ti alloy casting was devised, and was previously described in Japanese Patent Application No. 2-39360 (Japanese Patent Application Laid-Open
No. 65).
【０００４】[0004]
【発明が解決しようとする課題】ところで、上述したよ
うにしてＴｉまたはＴｉ合金鋳物を鋳造する場合、その
冷却過程において、キャビティ内部の鋳物の表面から凝
固し始めるため、中心部（例えばエンジンバルブにおい
ては傘部）が最終凝固部となり、この部分に鋳造ポアが
生じ易いという問題がある。そして、従来は、このよう
な鋳造欠陥を除去するために、ＨＩＰ処理等の後処理を
必要としていた。By the way, when casting a Ti or Ti alloy casting as described above, during the cooling process, solidification starts from the surface of the casting inside the cavity. Umbrella portion) becomes a final solidified portion, and there is a problem that casting pores are easily generated in this portion. Conventionally, post-processing such as HIP processing has been required to remove such casting defects.
【０００５】本発明は、上記事情に鑑みてなされたもの
で、その目的とするところは、鋳造時の最終凝固部が製
品内部に生じることを防止することができて、ＨＩＰ処
理等の後処理を必要とせずに鋳造ポアのない良好な品質
の製品を得ることができるＴｉまたはＴｉ合金鋳物の遠
心鋳造用金型を提供することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a final solidified portion from being formed inside a product at the time of casting, and to perform post-processing such as HIP processing. An object of the present invention is to provide a mold for centrifugal casting of a Ti or Ti alloy casting, which can obtain a product of good quality without casting pores without the need for a casting.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の請求項１は、棒体の先端に大径部が一体的
に形成されてなるＴｉまたはＴｉ合金鋳物の遠心鋳造用
金型において、鋳物を形成するキャビティが、大径部を
互いに対向配置して直線状に設けられ、かつこのキャビ
ティの大径部間に、最終凝固部となる連結空所が設けら
れたものである。また、本発明の請求項２は、キャビテ
ィの大径部及び連結空所が入子型とされたものである。In order to achieve the above object, a first aspect of the present invention is a centrifugal casting of a Ti or Ti alloy casting in which a large diameter portion is integrally formed at the tip of a rod. In the mold, a cavity for forming a casting is provided in a straight line with large-diameter portions disposed opposite to each other, and a connection cavity serving as a final solidification portion is provided between the large-diameter portions of the cavity. is there. According to a second aspect of the present invention, the large-diameter portion and the connection space of the cavity are nested.
【０００７】[0007]
【作用】本発明のＴｉまたはＴｉ合金鋳物の遠心鋳造用
金型の請求項１にあっては、互いに対向するキャビティ
の大径部間に設けられた連結空所を、遠心鋳造時の最終
凝固部とし、この部分に鋳造ポアを生じさせる。また、
本発明の請求項２にあっては、形状が複雑化するキャビ
ティの大径部及び連結空所を入子型として、機械加工あ
るいは鋳造により製造すると共に、その他の部分を機械
加工して両者を合体することにより、製作コストの低減
及び寸法精度の向上を図る。According to the first aspect of the present invention, there is provided a mold for centrifugal casting of a Ti or Ti alloy casting, wherein a connecting space provided between the large-diameter portions of the cavities facing each other is subjected to final solidification during centrifugal casting. And a casting pore is formed in this portion. Also,
According to claim 2 of the present invention, the large-diameter portion and the connecting cavity of the cavity having a complicated shape are formed as nested molds, and are manufactured by machining or casting, and the other portions are machined to combine the two. By merging, the manufacturing cost is reduced and the dimensional accuracy is improved.
【０００８】[0008]
【実施例】以下、図１に基づいて本発明の一実施例を説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
【０００９】この図において符号１はドーナツ盤状に形
成された金型本体である。この金型本体１は、その中心
側が湯道用の貫通孔２とされ、この貫通孔２から放射状
に多数の空隙３が形成されてなるものであり、２個の金
型本体１が、互いに各空隙３を合わせた状態で１つの金
型として使用されるものである。そして、上記空隙３
は、一対のエンジンバルブ１０を成形するためのキャビ
ティ４の大径部４ａが互いに対向配置され、このキャビ
ティ４の大径部４ａ間に、最終凝固部となる連結空所５
が設けられ、かつ上記貫通孔２側のキャビティ４の棒体
部４ｂと上記貫通孔２との間に、連通空所６が設けられ
て構成されている。上記エンジンバルブ１０は、丸棒状
の棒体１１と、この棒体１１の先端に形成された傘部１
２とから構成されているものである。また、上記のよう
な構成の金型本体１を一体物として製作する場合に、図
１に示すような複雑な形状の型彫りを機械加工により行
うのは難しく、しかも銅合金では放電加工も難しいの
で、鋳造性が良好で鋳肌がきれいに製作できるＢｅ−Ｃ
ｕ系合金（例えばＢｅ ２．５〜２．７５ｗｔ％、Ｃｏ
０．６〜０．９５ｗｔ％、Ｃｕ 残）を用いて鋳造す
る。なお、上記金型本体１の寸法精度がより精密に要求
される場合には、上記キャビティ４の両大径部４ａとこ
れらをつなぐ連結空所５とを囲む部分（図１において２
点鎖線で示す部分）を入子型７とするとよい。これによ
って、この入子型７だけを取り上げて別個に型彫りすれ
ばよくなるから、型彫り部分が小さくかつ比較的形状が
単純になり、従って、機械加工が可能になると共に、入
子型７を焼き嵌め、圧入あるいはボルト止めによって入
れ込む本体型８も機械加工により容易に製作することが
でき、しかも上記Ｂｅ−Ｃｕ系合金より安価なアルミ青
銅、Ｃｒ−Ｚｒ−Ｃｕ系合金等の銅合金を使用でき、製
作費が安価でかつ寸法精度の良好な金型が得られる。さ
らに、上記入子型７が機械加工しにくい場合には、この
入子型７だけを上記Ｂｅ−Ｃｕ系合金で鋳造すればよ
く、これにより、上記金型本体１を一体鋳造するのに比
べて、鋳造による反りが小さく抑えられて寸法精度が向
上すると共に、本体型８を安価に製作できる分だけ製作
費を低減できる。In FIG. 1, reference numeral 1 denotes a mold main body formed in a donut shape. The center of the mold body 1 is a through hole 2 for a runner, and a large number of voids 3 are formed radially from the through hole 2. The two mold bodies 1 It is used as one mold in a state where the gaps 3 are combined. And the above gap 3
The large-diameter portions 4a of the cavities 4 for molding the pair of engine valves 10 are arranged to face each other, and between the large-diameter portions 4a of the cavities 4, a connection space 5 serving as a final solidification portion is formed.
And a communication space 6 is provided between the rod portion 4 b of the cavity 4 on the through hole 2 side and the through hole 2. The engine valve 10 includes a round rod-shaped rod 11 and an umbrella 1 formed at the tip of the rod 11.
And 2. In addition, when the mold body 1 having the above-described structure is manufactured as an integral body, it is difficult to machine a complicated shape as shown in FIG. 1 by machining, and it is also difficult to perform electric discharge machining with a copper alloy. Be-C with good castability and clean casting surface
u-based alloy (for example, Be 2.5 to 2.75 wt%, Co
0.6 to 0.95 wt%, with Cu remaining). When the dimensional accuracy of the mold body 1 is required to be more precise, a portion (2 in FIG. 1) that surrounds both large diameter portions 4a of the cavity 4 and a connection space 5 connecting them.
The portion indicated by the dotted chain line) may be the nesting type 7. As a result, only the nesting mold 7 needs to be picked up and separately engraved, so that the engraving portion is small and the shape is relatively simple, so that machining can be performed and the nesting mold 7 can be formed. The main body 8 to be inserted by shrink fitting, press-fitting or bolting can be easily manufactured by machining, and moreover, copper alloys such as aluminum bronze and Cr-Zr-Cu alloys, which are less expensive than the Be-Cu alloys, are used. A mold that can be used, has low manufacturing costs, and has good dimensional accuracy can be obtained. Further, when the insert mold 7 is difficult to machine, only the insert mold 7 may be cast with the Be-Cu-based alloy. As a result, the warpage due to casting is suppressed to a small value, the dimensional accuracy is improved, and the manufacturing cost can be reduced by the cost of manufacturing the main body 8.
【００１０】上記のように構成された遠心鋳造用金型を
用いてエンジンバルブ１０を鋳造する場合には、まず、
上述したようにして製作された一対の金型本体１を互い
に対向密着させ、貫通孔２を中心として所定回転数にて
回転させた状態において、該貫通孔２を湯道として溶湯
を各空隙３内に充填する。これにより、上記各空隙３、
すなわち、連通空所６、内周側のキャビティ４、連結空
所５及び外周側のキャビティ４に完全に溶湯が行きわた
る。そして、上記各空隙３内に鋳込まれた溶湯が金型本
体１に熱を奪われることにより、その外表面から冷却さ
れて凝固していく。この結果、容積が大きく周囲に熱が
逃げにくい上記連結空所５の中心部が最終凝固部となっ
て上記各空隙３内の溶湯が完全に凝固する。次いで、上
記金型本体１間を開いて内部の鋳造品を取り出し、かつ
一対のエンジンバルブ１０の傘部１２どうしを連結して
いる部分を切除して２つのエンジンバルブ１０を得る。
この場合、上述したように、傘部１２どうしを連結して
いる部分が最終凝固部となっているから、鋳造ポアはこ
の部分に生じることとなり、エンジンバルブ１０となる
部分には鋳造欠陥が生じないため、ＨＩＰ処理等の後処
理を施すことなく良好な品質の製品が得られる。When the engine valve 10 is cast using the centrifugal casting mold configured as described above, first,
In a state where the pair of mold bodies 1 manufactured as described above are brought into close contact with each other and rotated at a predetermined rotational speed around the through hole 2, the molten metal is used as a runner with the through hole 2 as a runner. Fill inside. As a result, each of the above gaps 3,
In other words, the molten metal completely flows through the communication cavity 6, the inner peripheral cavity 4, the connecting cavity 5, and the outer peripheral cavity 4. Then, the molten metal cast into each of the gaps 3 is deprived of heat by the mold body 1, and is cooled from its outer surface and solidified. As a result, the central portion of the connection space 5 having a large volume and hardly allowing heat to escape to the periphery becomes a final solidification portion, and the molten metal in each of the voids 3 is completely solidified. Next, the space between the mold bodies 1 is opened to take out the cast product inside, and a portion connecting the umbrella portions 12 of the pair of engine valves 10 is cut off to obtain two engine valves 10.
In this case, as described above, since the portion connecting the umbrella portions 12 is the final solidified portion, casting pores are generated in this portion, and casting defects occur in the portion serving as the engine valve 10. Therefore, a product of good quality can be obtained without performing post-processing such as HIP processing.
【００１１】[0011]
【発明の効果】以上説明したように、本発明の請求項１
は、棒体の先端に大径部が一体的に形成されてなるＴｉ
またはＴｉ合金鋳物の遠心鋳造用金型において、鋳物を
形成するキャビティが、大径部を互いに対向配置して直
線状に設けられ、かつこのキャビティの大径部間に、最
終凝固部となる連結空所が設けられたものであるから、
互いに対向するキャビティの大径部間に設けられた連結
空所を、遠心鋳造時の最終凝固部とし、この部分に意識
的に鋳造ポアを生じさせることにより、鋳造時の最終凝
固部が製品内部に生じることを防止することができて、
ＨＩＰ処理等の後処理を必要とせずに鋳造ポアのない良
好な品質の製品を得ることができる。また、本発明の請
求項２は、キャビティの大径部及び連結空所が入子型と
されたものであるから、形状が複雑化するキャビティの
大径部及び連結空所を入子型として、機械加工あるいは
鋳造により製造すると共に、その他の部分を機械加工し
て両者を合体することにより、鋳造用の高価な材料の使
用を皆無にできあるいは極端に少なくでき、従って、製
作コストの低減を図ることができると共に、機械加工の
全面的なあるいは大幅な採用及び鋳造部分の小型化によ
り、金型並びに製品の寸法精度の向上を図ることができ
る。As described above, according to the first aspect of the present invention,
Is a Ti having a large diameter portion integrally formed at the tip of a rod.
Alternatively, in a mold for centrifugal casting of a Ti alloy casting, a cavity for forming the casting is provided in a straight line with large-diameter portions facing each other, and a connection as a final solidification portion is provided between the large-diameter portions of the cavity. Since there is a vacant space,
The connection space provided between the large-diameter portions of the cavities facing each other is used as the final solidification part during centrifugal casting, and casting pores are intentionally generated in this part, so that the final solidification part during casting becomes inside the product. Can be prevented,
Good quality products without casting pores can be obtained without the need for post-processing such as HIP processing. According to the second aspect of the present invention, since the large-diameter portion and the connection space of the cavity are of the nest type, the large-diameter portion and the connection space of the cavity having a complicated shape are of the nest type. By manufacturing by machining or casting, and by machining the other parts and combining the two, the use of expensive materials for casting can be eliminated or extremely reduced, thus reducing the manufacturing cost. The dimensional accuracy of the mold and the product can be improved by using the entire or large amount of machining and reducing the size of the cast part.
【図１】本発明の一実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment of the present invention.
４ キャビティ ４ａ 大径部 ５ 連結空所 ７ 入子型 １０ エンジンバルブ（鋳物） １１ 棒体 １２ 傘部（大径部） Reference Signs List 4 Cavity 4a Large diameter part 5 Connecting space 7 Nesting type 10 Engine valve (cast) 11 Rod 12 Head part (large diameter part)
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−9008（ＪＰ，Ａ) 実開 昭61−67961（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 13/06 B22C 9/06 B22D 13/10 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-9008 (JP, A) JP-A-61-67961 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) B22D 13/06 B22C 9/06 B22D 13/10
Claims (2)
てなるＴｉまたはＴｉ合金鋳物の遠心鋳造用金型におい
て、鋳物を形成するキャビティが、大径部を互いに対向
配置して直線状に設けられ、かつこのキャビティの大径
部間に、最終凝固部となる連結空所が設けられたことを
特徴とするＴｉまたはＴｉ合金鋳物の遠心鋳造用金型。In a mold for centrifugally casting a Ti or Ti alloy casting in which a large diameter portion is integrally formed at the tip of a rod body, a cavity for forming the casting has the large diameter portions arranged to face each other. A centrifugal casting mold for a Ti or Ti alloy casting, which is provided linearly and has a connecting cavity serving as a final solidified portion between large diameter portions of the cavity.
型とされたことを特徴とする請求項１記載のＴｉまたは
Ｔｉ合金鋳物の遠心鋳造用金型。2. The mold for centrifugal casting of a Ti or Ti alloy casting according to claim 1, wherein the large-diameter portion and the connection cavity of the cavity are nested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4260270A JP3070295B2 (en) | 1992-09-29 | 1992-09-29 | Mold for centrifugal casting of Ti or Ti alloy casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4260270A JP3070295B2 (en) | 1992-09-29 | 1992-09-29 | Mold for centrifugal casting of Ti or Ti alloy casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06106319A JPH06106319A (en) | 1994-04-19 |
| JP3070295B2 true JP3070295B2 (en) | 2000-07-31 |
Family
ID=17345729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4260270A Expired - Fee Related JP3070295B2 (en) | 1992-09-29 | 1992-09-29 | Mold for centrifugal casting of Ti or Ti alloy casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3070295B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9364890B2 (en) * | 2013-03-11 | 2016-06-14 | Ati Properties, Inc. | Enhanced techniques for centrifugal casting of molten materials |
-
1992
- 1992-09-29 JP JP4260270A patent/JP3070295B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06106319A (en) | 1994-04-19 |
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