JP3005368B2 - Manufacturing method of powdered sintered products - Google Patents
Manufacturing method of powdered sintered productsInfo
- Publication number
- JP3005368B2 JP3005368B2 JP4248698A JP24869892A JP3005368B2 JP 3005368 B2 JP3005368 B2 JP 3005368B2 JP 4248698 A JP4248698 A JP 4248698A JP 24869892 A JP24869892 A JP 24869892A JP 3005368 B2 JP3005368 B2 JP 3005368B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- molding aid
- sintering
- divided bodies
- sintered
- 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)
Description
【0001】[0001]
【産業上の利用分野】本発明は、粉末と成形助剤の混合
品より成形体を製作し、脱脂という工程で成形助剤を除
去し、焼結をする工程により焼結部品を製造する方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a compact from a mixture of a powder and a molding aid, removing the molding aid in a step of degreasing, and sintering to produce a sintered part. About.
【0002】[0002]
【従来の技術】金属あるいはセラミックスの焼結部品
は、粉末射出成形技術の実用化により急速に発展を遂げ
てきた。この技術は、一般にバインダーと呼ばれる主成
分が熱可塑性樹脂やワックスからなる有機高分子材を金
属あるいはセラミックスの粉末に混練させた材料を射出
成形機で成形し、脱脂、焼結することにより、難加工か
つ複雑な三次元形状部品でも、高精度でしかも大量に製
造できるという特徴を持っている。また、この方法によ
れば微細粉末を使用するため、一般の直圧プレス法で得
られる焼結部品よりも焼結密度が高く、機械的性質の優
れた部品が得られる。しかし、この方法によっても一度
の成形で不可能な形状、あるいは一度の成形では非常に
複雑な金型構造を必要とする部品がある。2. Description of the Related Art Sintered parts made of metal or ceramics have been rapidly developed by the practical application of powder injection molding technology. This technique is difficult by forming a material obtained by kneading an organic polymer material, whose main component is generally called a binder, a thermoplastic resin or wax into a metal or ceramic powder, using an injection molding machine, and then degreased and sintered. It has the feature that even processed and complicated three-dimensionally shaped parts can be manufactured with high precision and in large quantities. Further, according to this method, since fine powder is used, a sintered part having a higher sintering density than a sintered part obtained by a general direct pressure pressing method and having excellent mechanical properties can be obtained. However, there are parts that cannot be formed by a single molding even with this method, or that require a very complicated mold structure in a single molding.
【0003】このため、金属あるいはセラミックス粉末
で所望形状の分割体を複数個成形した後、この分割体を
成形後の脱脂工程、あるいは脱脂後の焼結工程のいずれ
かにおいて接合させて所望形状の部品を得るという方法
が考えられている(特開昭60−204675号)。For this reason, after forming a plurality of divided bodies having a desired shape from metal or ceramic powder, the divided bodies are joined in either a degreasing step after molding or a sintering step after degreasing to form a desired shape. A method of obtaining parts has been considered (Japanese Patent Application Laid-Open No. 60-204675).
【0004】[0004]
【発明が解決しようとする課題】この製造方法によれ
ば、一度の成形では不可能あるいは困難な金属あるいは
セラミックスの複雑な三次元形状部品を製造することが
できるが、成形後に接合した部品は焼結後の接合強度が
弱く、又、脱脂後に接合する場合、脱脂体自身の強度が
非常に弱く、脱脂体の取扱い時にハンドリングミス等で
変形させてしまうという課題があった。According to this manufacturing method, it is possible to manufacture a complicated three-dimensional part made of metal or ceramics which is impossible or difficult with one molding, but the parts joined after molding are fired. There is a problem in that the bonding strength after binding is weak, and when bonding is performed after degreasing, the strength of the degreased body itself is extremely weak, and the degreased body is deformed due to handling mistakes or the like during handling.
【0005】本発明はこのような課題を解決するために
なされたもので、その目的とするところは、脱脂品を変
形させずに組立てることができ、又、成形品の状態で組
立てた時よりも接合面強度の強い部品の製造が可能な粉
末焼結品の製造方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to assemble a degreased product without deforming it. Another object of the present invention is to provide a method for manufacturing a powder sintered product capable of manufacturing a component having a high bonding surface strength.
【0006】[0006]
【課題を解決するための手段】前記目的を達成するた
め、本発明は焼結可能な粉末と成形助剤の混合品より所
望形状の分割体を複数個成形し、成形助剤を所定量だけ
除去し、前記分割体を最終形状に組立てた後、残りの成
形助剤を除去し、焼結することを特徴とする。又、本発
明は焼結可能な非酸化物系粉末と成形助剤の混合品より
所望形状の分割体を複数個成形し、非酸化雰囲気で成形
助剤を除去し、酸化雰囲気で表面を酸化させた後、最終
形状に組立て、焼結することを特徴とする。In order to achieve the above object, the present invention forms a plurality of divided bodies having a desired shape from a mixture of a sinterable powder and a molding aid, and a predetermined amount of the molding aid. After removing and assembling the divided body into a final shape, the remaining molding aid is removed and sintering is performed. Also, the present invention forms a plurality of divided bodies having a desired shape from a mixture of a non-oxide type powder and a molding aid which can be sintered, removes the molding aid in a non-oxidizing atmosphere, and oxidizes the surface in an oxidizing atmosphere. After that, it is assembled into a final shape and sintered.
【0007】[0007]
【作用】本発明では、脱脂工程において成形分割体のバ
インダーを所定量だけ脱脂し、組立て後、再度残りのバ
インダーを脱脂し、焼結することで、焼結後の接合強度
の高い焼結部品を得ることができる。又、本発明では、
非酸化雰囲気中での脱脂が完了した分割体の接合面以外
の表面を酸化雰囲気中で酸化させ、接合後に焼結するこ
とで、接合時のハンドリングミスによる変形不良がな
く、又、焼結後の接合強度の高い焼結部品を得ることが
可能となる。According to the present invention, in the degreasing step, the binder of the molded divided body is degreased by a predetermined amount, and after assembling, the remaining binder is degreased and sintered again. Can be obtained. In the present invention,
By oxidizing the surfaces other than the joining surface of the divided body that has been degreased in a non-oxidizing atmosphere in an oxidizing atmosphere and sintering after joining, there is no deformation failure due to handling mistakes during joining, and after sintering It is possible to obtain a sintered component having a high bonding strength.
【0008】[0008]
【実施例】以下、本発明の実施例を説明するが、具体例
として図1に示すようなL字型の管の形状をした粉末焼
結品を製造する方法を述べる。この形状をした部品を射
出成形にて製造しようとすると、金型構造が非常に複雑
となる。又、金属あるいはセラミックス粉末と熱可塑性
樹脂等の混合物を材料とするため、一般的なプラスチッ
クほど流動性は良くなく、複雑な金型構造をした部品の
成形が不可能となることもある。そのため、所望形状の
分割体を複数個成形し、組立てた後に焼結することでそ
の部品を得ることができるが、本発明は組立て工程に特
徴を有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. As a specific example, a method for producing a powder sintered product in the shape of an L-shaped tube as shown in FIG. 1 will be described. If a part having this shape is to be manufactured by injection molding, the mold structure becomes very complicated. Further, since a material such as a metal or a mixture of ceramic powder and a thermoplastic resin is used as a material, the fluidity is not as good as that of a general plastic, and it may be impossible to mold a component having a complicated mold structure. Therefore, a part can be obtained by molding a plurality of divided bodies having a desired shape, sintering them after assembling them, and the present invention is characterized by an assembling process.
【0009】(実施例1)この実施例では、平均粒径約
10μmのSUS316L粉末をアクリル系樹脂とワッ
クスの混合物に対して重量比で100:11の割合で混
練したものを材料とした。そして、図2に示すような分
割体1,2を射出成形機にて成形する。通常、脱脂工程
は還元性雰囲気中において約24Hrで500℃まで加
熱してほぼ100%のバインダーを除去するが、この工
程を270℃までの加熱で脱バインダー量を重量比で5
0%とする。次に、図3に示すように分割体1,2を接
合面3に合わせて組立てた後、残りのバインダーを脱脂
し、更に1350℃、約1Hrの焼結を行うことで、図
1のような粉末焼結品を得る。(Example 1) In this example, SUS316L powder having an average particle diameter of about 10 µm was kneaded at a weight ratio of 100: 11 with respect to a mixture of an acrylic resin and a wax. Then, the divided bodies 1 and 2 as shown in FIG. 2 are molded by an injection molding machine. Usually, the degreasing step is performed by heating to 500 ° C. in a reducing atmosphere at about 24 hours to remove almost 100% of the binder.
0%. Next, as shown in FIG. 3, after assembling the divided bodies 1 and 2 with the joining surface 3, the remaining binder is degreased, and further sintering is performed at 1350 ° C. and about 1 hr, as shown in FIG. Powder sintered product is obtained.
【0010】(実施例2)この実施例では、平均粒径約
10μmのSUS316L粉末をアクリル系樹脂とワッ
クスの混合物に対して重量比で100:11の割合で混
練したものを材料とした。そして、図2に示すような分
割体1,2を射出成形機にて成形する。通常、この成形
品を還元性雰囲気中において約24Hrで500℃まで
加熱してほぼ100%のバインダーを除去し、その後焼
結を行うが、この脱脂工程が完了した500℃の時点で
接合面3を除く表面を酸化雰囲気に晒して表面に酸化膜
を形成する。次に、図3に示すように分割体1,2を接
合面3に合わせて組立てた後、還元性雰囲気中で加熱し
ながら表面酸化物を還元し、最終的に1350℃で約1
Hrの焼結を行い、図1のような粉末焼結品を得る。(Example 2) In this example, SUS316L powder having an average particle size of about 10 μm was kneaded at a weight ratio of 100: 11 with respect to a mixture of an acrylic resin and a wax. Then, the divided bodies 1 and 2 as shown in FIG. 2 are molded by an injection molding machine. Usually, the molded article is heated to 500 ° C. in a reducing atmosphere at about 24 hours to remove almost 100% of the binder, and then sintered, but when the degreasing step is completed at 500 ° C., the joining surface 3 Is exposed to an oxidizing atmosphere to form an oxide film on the surface. Next, as shown in FIG. 3, the divided bodies 1 and 2 are assembled in accordance with the bonding surface 3, and the surface oxide is reduced while heating in a reducing atmosphere.
Hr is sintered to obtain a powder sintered product as shown in FIG.
【0011】[0011]
【発明の効果】本発明は、以上説明した通り、焼結可能
な粉末と成形助剤の混合品より所望形状の分割体を複数
個成形し、成形助剤を所定量だけ除去し、前記分割体を
最終形状に組立てた後、残りの成形助剤を除去し、焼結
することにより、焼結後の接合強度の高い焼結部品を得
ることができる。又、本発明は、焼結可能な非酸化物系
粉末と成形助剤の混合品より所望形状の分割体を複数個
成形し、非酸化雰囲気で成形助剤を除去し、酸化雰囲気
で表面を酸化させた後、最終形状に組立て、焼結するこ
とにより、脱脂品を変形させずに組立てることができ、
また、成形品の状態で組立てた時よりも接合面強度の強
い部品を得ることができる。As described above, the present invention forms a plurality of divided bodies having a desired shape from a mixture of a sinterable powder and a molding aid, removes a predetermined amount of the molding aid, and After assembling the body into the final shape, the remaining molding aid is removed and sintering is performed, whereby a sintered part having a high bonding strength after sintering can be obtained. The present invention also provides a method for forming a plurality of divided bodies having a desired shape from a mixture of a non-oxide type powder and a forming aid which can be sintered, removing the forming aid in a non-oxidizing atmosphere, and treating the surface in an oxidizing atmosphere. After oxidizing, by assembling to the final shape and sintering, it can be assembled without deforming the degreased product,
Further, it is possible to obtain a part having a stronger joint surface than when assembled in a state of a molded product.
【図1】本発明方法により得られた粉末焼結品の外観を
示す図である。FIG. 1 is a view showing the appearance of a powder sintered product obtained by the method of the present invention.
【図2】その分割体を示す図である。FIG. 2 is a diagram showing the divided body.
【図3】分割体を組立てる状態を示す図である。FIG. 3 is a view showing a state in which a divided body is assembled.
1 分割体 2 分割体 3 接合面 1 split body 2 split body 3 joining surface
Claims (2)
所望形状の分割体を複数個成形し、成形助剤を所定量だ
け除去し、前記分割体を最終形状に組立てた後、残りの
成形助剤を除去し、焼結することを特徴とする粉末焼結
品の製造方法。1. A plurality of divided bodies having a desired shape are formed from a mixture of a sinterable powder and a molding aid, a predetermined amount of the molding aid is removed, and the divided bodies are assembled into a final shape. A method for producing a powder-sintered product, comprising removing remaining molding aid and sintering.
混合品より所望形状の分割体を複数個成形し、非酸化雰
囲気で成形助剤を除去し、酸化雰囲気で表面を酸化させ
た後、最終形状に組立て、焼結することを特徴とする粉
末焼結品の製造方法。2. A plurality of divided bodies having a desired shape are formed from a mixture of a sinterable non-oxide powder and a molding aid, the molding aid is removed in a non-oxidizing atmosphere, and the surface is oxidized in an oxidizing atmosphere. A method for manufacturing a powdered sintered product, comprising: assembling into a final shape after sintering;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4248698A JP3005368B2 (en) | 1992-08-25 | 1992-08-25 | Manufacturing method of powdered sintered products |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4248698A JP3005368B2 (en) | 1992-08-25 | 1992-08-25 | Manufacturing method of powdered sintered products |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0672774A JPH0672774A (en) | 1994-03-15 |
JP3005368B2 true JP3005368B2 (en) | 2000-01-31 |
Family
ID=17182007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4248698A Expired - Fee Related JP3005368B2 (en) | 1992-08-25 | 1992-08-25 | Manufacturing method of powdered sintered products |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3005368B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2000447A4 (en) * | 2006-03-24 | 2012-07-25 | Ngk Insulators Ltd | Sintered body, light emitting tube and process for manufacturing the same |
JP5197975B2 (en) * | 2006-03-24 | 2013-05-15 | 日本碍子株式会社 | Sintered body, arc tube and manufacturing method thereof |
JP7435161B2 (en) * | 2020-03-30 | 2024-02-21 | セイコーエプソン株式会社 | Manufacturing method of metal composite sintered body |
-
1992
- 1992-08-25 JP JP4248698A patent/JP3005368B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0672774A (en) | 1994-03-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |