JP3329518B2 - Manufacturing method of metal powder injection molded products - Google Patents
Manufacturing method of metal powder injection molded productsInfo
- Publication number
- JP3329518B2 JP3329518B2 JP18663193A JP18663193A JP3329518B2 JP 3329518 B2 JP3329518 B2 JP 3329518B2 JP 18663193 A JP18663193 A JP 18663193A JP 18663193 A JP18663193 A JP 18663193A JP 3329518 B2 JP3329518 B2 JP 3329518B2
- Authority
- JP
- Japan
- Prior art keywords
- product
- metal powder
- molded
- sintering
- injection
- 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 - Lifetime
Links
Landscapes
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は金属粉末射出成形の製造
方法に関し、特に複雑形状で脱脂あるいは焼結時に変形
や曲がりが防止できる金属粉末射出成形品の製造に関わ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a metal powder injection molding, and more particularly to a method of manufacturing a metal powder injection molded product having a complicated shape and capable of preventing deformation or bending during degreasing or sintering.
【０００２】[0002]
【従来の技術】金属粉末射出成形法は、３次元複雑形状
の金属部品を得る手段として近年急速に普及しつつあ
る。本製法は寸法精度が高く、高精度でニアネットシェ
イプの金属部品を得ることができる。その製造方法とし
ては、金属粉末に流動性や保形性等を付与するために、
有機バインダを添加し混練してコンパウンドを作成す
る。できたコンパウンドを金型に射出成形し成形体を
得、該成形体を加熱等の方法により脱脂を行い、その後
焼結することによって製品を得ることができる。2. Description of the Related Art The metal powder injection molding method has been rapidly spreading in recent years as a means for obtaining a metal part having a three-dimensional complicated shape. This manufacturing method has a high dimensional accuracy, and can obtain a metal part of a near net shape with high accuracy. As its production method, in order to impart fluidity and shape retention to the metal powder,
An organic binder is added and kneaded to form a compound. A product can be obtained by injection molding the resulting compound into a mold to obtain a molded body, degrease the molded body by a method such as heating, and then sintering.
【０００３】[0003]
【発明が解決しようとする課題】金属粉末射出成形法で
は、金属粉末に流動性を付与するために多量のバインダ
を添加するので、従来のプレス成形による粉末冶金法と
比べ脱脂焼結時の収縮率が大きく、製品形状によっては
大きな変形が発生することがあった。例を上げると、図
２の様なＵ字形状をした製品を脱脂焼結するとき、脱脂
焼結用治具との接触面の摩擦等により製品先端部が図３
の様に開いてしまう場合がある。In the metal powder injection molding method, a large amount of binder is added to impart fluidity to the metal powder. The rate was large, and large deformation sometimes occurred depending on the product shape. For example, when a U-shaped product as shown in FIG. 2 is degreased and sintered, the front end of the product is caused by friction of a contact surface with a degreasing sintering jig or the like.
May open like this.
【０００４】また、射出成形時ランナから製品キャビテ
ィ部へ混練材料を注入するための注入口の跡は、成形体
の時に取り除いてから脱脂焼結を行い製品にする方法
と、そのまま脱脂焼結して焼結後に研磨等の方法により
除去する場合とがあるが、いずれにしても何らかの後処
理が通常必要である。金属粉末射出成形は高価な微粉末
を使用する事から、コスト面で主に小物部品に適用され
るが、特に小物部品になるほど射出成形時の注入口跡の
後処理に多大な工数を要する。本発明は、上記のような
焼結時に変形しやすい形状を有する金属粉末射出成形品
において焼結変形を防止するとともに注入口跡処理工数
を低減することを目的とする。[0004] Further, a trace of an injection port for injecting a kneading material from a runner into a product cavity portion during injection molding is removed at the time of a molded body and then degreased and sintered to produce a product. After sintering, it may be removed by a method such as polishing, but in any case, some post-treatment is usually required. Metal powder injection molding is used mainly for small parts in terms of cost because expensive fine powder is used. However, especially for small parts, a large number of man-hours are required for post-processing of an injection port trace during injection molding. An object of the present invention is to prevent sintering deformation in a metal powder injection-molded product having a shape that is easily deformed during sintering as described above, and to reduce the number of injection mark trace processing steps.
【０００５】[0005]
【課題を解決するための手段】本発明は、金属粉末射出
成形法において製品部と該製品部に存在する間隙を連結
する連結部とを一体で射出成形した成形体を脱脂焼結す
れば脱脂焼結時の変形を防止できることを見いだし、本
発明に到達した。すなわち本発明は製品部と該製品部に
存在する間隙を連結する連結部とが一体となった成形体
に射出成形し、該成形体を脱脂焼結することを特徴とす
る金属粉末射出成形品の製造方法である。さらに本発明
において射出成形の注入口を前記連結部に設ければ、改
めて注入口を別に除去する必要がなくなり処理工数を低
減できる。SUMMARY OF THE INVENTION According to the present invention, there is provided a metal powder injection molding method in which a molded product obtained by integrally molding a product portion and a connecting portion connecting a gap existing in the product portion is degreased and sintered. The inventors have found that deformation during sintering can be prevented, and have reached the present invention. That is, the present invention is characterized in that a metal part is injection-molded into a molded body in which a product part and a connecting part that connects a gap existing in the product part are integrated, and the molded body is degreased and sintered. It is a manufacturing method of. Furthermore, in the present invention, if an injection port for injection molding is provided in the connection portion, it is not necessary to separately remove the injection port, and the number of processing steps can be reduced.
【０００６】[0006]
【作用】金属粉末射出成形法においては、金属粉末に射
出時の流動性を付与するために一般に体積比で３０％〜
５０％のバインダを含んでいる。バインダは脱脂焼結時
には熱分解等により製品から抜けていくため、製品の体
積はバインダが抜けた分だけ収縮することになる。この
時、形状によっては製品と脱脂焼結用治具との接触面の
摩擦によって変形を生じることがある。このような形状
の製品を製造するとき、製品の変形や曲がりの考えられ
る部分に、変形を防ぐような連結部を付加して設定した
金型を製作し、射出成形時に製品部と連結部とが一体と
なった成形体を成形する。本発明でいう連結部とは、例
えばスリット等を有する製品形状においてスリット間に
設ける余肉のことをいい、スリット等により分割され離
されている製品部位をつなぎ拘束するものである。成形
体を連結部がついたまま脱脂焼結することにより、脱脂
焼結時の変形を防ぐことが可能になる。焼結後焼結体か
ら連結部を除去することにより所望の形状の製品を、変
形や曲がりを発生させることなく得ることができる。In the metal powder injection molding method, in order to impart fluidity at the time of injection to the metal powder, it is generally 30% by volume or more.
Contains 50% binder. Since the binder is removed from the product by thermal decomposition or the like during degreasing and sintering, the volume of the product shrinks by the amount of the binder removed. At this time, depending on the shape, deformation may occur due to friction of the contact surface between the product and the degreasing sintering jig. When manufacturing a product of such a shape, a mold is set by adding a connecting part that prevents deformation to a part where deformation or bending of the product is considered, and a product part and a connecting part are formed during injection molding. Are formed into a single unit. In the present invention, the connection portion refers to, for example, extra space provided between slits in a product shape having a slit or the like, and connects and restricts product parts divided and separated by the slit or the like. By performing degreasing sintering on the molded body with the connecting portion attached, deformation during degreasing sintering can be prevented. By removing the connecting portion from the sintered body after sintering, a product having a desired shape can be obtained without causing deformation or bending.
【０００７】連結部の形状は目的に応じ任意に選択でき
る。例えば、焼結後連結部を除去する場合に、連結部の
形状を図２のようにＵ字形にしておけば端面を研削する
ことにより、簡単に連結部を除去することができる。連
結部を特に切断除去する必要の無い場合には、そのまま
最終製品の形状の一部として残してもよい。また、前記
したように、特に小物射出成形品は注入口跡の処理に多
大な工数を要するため、注入口を前記連結部に設ける事
により連結部の後処理と同時に処理できるので注入口処
理の工数を低減する事が可能となる。[0007] The shape of the connecting portion can be arbitrarily selected according to the purpose. For example, when removing the connection portion after sintering, if the shape of the connection portion is U-shaped as shown in FIG. 2, the connection portion can be easily removed by grinding the end face. If there is no particular need to cut and remove the connecting portion, it may be left as part of the shape of the final product. In addition, as described above, especially for small injection molded products, a great deal of man-hours are required for processing the trace of the injection port. Therefore, by providing the injection port in the connection section, the processing can be performed simultaneously with the post-processing of the connection section. Can be reduced.
【０００８】[0008]
【実施例】本発明の実施例について説明する。なお、本
発明は、以下の実施例によって限定されるものではな
い。図２に示す一辺が１０mmの立方体に、幅３mm奥行き
７mmのスリット４を有する形状の製品を射出成形法によ
って製作しようとする。このとき、製品形状から脱脂焼
結時に図３の様な変形が予想される。ここで変形を防ぐ
ために図１に示すように製品部１と連結部２が一体とな
った形状として成形できる金型を製作した。ここで注入
口３は連結部２に設けた。そして、平均粒形８．５μm
のＳＵＳ３１６Ｌ水アトマイズ粉と有機バインダの重量
比が９２：８となるように混練しコンパウンドとした。
このコンパウンドを金型に射出成形し２０個の成形体を
得た。内１０個は成形後メスにて連結部２を削除した。
連結部２を削除した成形体、連結部２付きの成形体各々
１０個を脱脂焼結兼用炉内に投入し、窒素雰囲気中で６
２０℃にて１hr保持し脱脂を行い、引き続きアルゴン減
圧雰囲気中で１３２０℃にて１ｈｒ保持し焼結を行っ
た。An embodiment of the present invention will be described. The present invention is not limited by the following examples. A product shown in FIG. 2 having a shape of a cube having a side of 10 mm and a slit 4 having a width of 3 mm and a depth of 7 mm is to be manufactured by an injection molding method. At this time, a deformation as shown in FIG. 3 is expected at the time of degreasing and sintering from the product shape. Here, in order to prevent the deformation, as shown in FIG. 1, a metal mold was manufactured which can be formed into a shape in which the product part 1 and the connecting part 2 are integrated. Here, the injection port 3 was provided in the connecting portion 2. And the average grain size 8.5μm
SUS316L water atomized powder and an organic binder were kneaded so as to have a weight ratio of 92: 8 to obtain a compound.
This compound was injection-molded into a mold to obtain 20 molded bodies. For 10 of them, the connecting part 2 was deleted with a scalpel after molding.
Each of the molded body without the connecting part 2 and the ten molded bodies with the connecting part 2 was put into a furnace for combined use of degreasing and sintering, and was placed in a nitrogen atmosphere.
Degreasing was performed by holding at 20 ° C. for 1 hour, and then sintering was performed at 1320 ° C. for 1 hour in an argon reduced pressure atmosphere.
【０００９】焼結後、連結部付き品１０個についてはベ
ルトグラインダで連結部２を研削除去した。それぞれの
スリット部の寸法を測定したところ連結部無し品１０個
のスリット部は平均で底部ａに対して先端部ｂが０．４
５mm開いており、開き寸法のバラツキも±３σで０．２
８３と大きい値を示しているのに対し、連結部付き品は
ａ部に対しｂ部の開きが１０個中最大で０．０２mm、平
均値で０．０１７mm、±３σのバラツキで０．０１２と
開きや変形がほとんど認められなかった。After sintering, the connection part 2 was ground and removed by a belt grinder for ten products with a connection part. When the dimensions of each slit were measured, the average of the slits of the 10 slits without the connecting part was 0.4 at the tip b with respect to the bottom a.
Open 5mm, variation of opening size is ± 3σ 0.2
83 shows a large value, whereas in the case of the product with a connecting part, the opening of the part b is 0.02 mm at maximum in 10 parts, the average value is 0.017 mm, and the variation of ± 3σ is 0.012 with respect to the part a. Opening and deformation were hardly recognized.
【００１０】[0010]
【発明の効果】以上に説明したように、脱脂焼結時に脱
脂焼結用治具との設置面における摩擦により変形を起こ
すと思われる形状の製品を製作する場合、本発明により
変形や曲がりを防止することができる。また連結部に注
入口を設ければ、後処理工数低減も可能となる。As described above, in the case of manufacturing a product having a shape which is supposed to be deformed due to friction on the installation surface with the degreasing sintering jig at the time of degreasing sintering, the present invention prevents deformation and bending. Can be prevented. In addition, if an injection port is provided in the connection portion, the number of post-processing steps can be reduced.
【図１】本発明の一実施例である製品部と連結部が一体
になった成形品形状を示した図である。FIG. 1 is a diagram showing a molded product shape in which a product portion and a connection portion according to one embodiment of the present invention are integrated.
【図２】脱脂焼結時に変形し易い成形体形状を示した図
である。FIG. 2 is a view showing a shape of a compact that is easily deformed during degreasing sintering.
【図３】脱脂焼結時の変形状態を示した図である。FIG. 3 is a diagram showing a deformed state at the time of degreasing sintering.
１ 製品部 ２ 連結部 ３ 注入口 1 Product section 2 Connecting section 3 Inlet
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B22F 3/02 B22F 5/00 - 5/12 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B22F 3/02 B22F 5/00-5/12
Claims (2)
する連結部とが一体となった成形体に射出成形し、該成
形体を脱脂焼結することを特徴とする金属粉末射出成形
品の製造方法。1. A metal powder injection molding, wherein a product part and a connecting part connecting a gap existing in the product part are injection-molded into a molded body, and the molded body is degreased and sintered. Product manufacturing method.
する連結部とが一体となった成形体に、前記連結部に設
けた射出成形の注入口より射出成形し、該成形体を脱脂
焼結したのち前記連結部を除去することを特徴とする金
属粉末射出成形品の製造方法。To 2. A product portion and molded body and the connecting portion connecting the gap are integrated present in the product section, injection molded from an inlet setting <br/> Ke injection molded to the connecting portion, A method for producing a metal powder injection-molded article, comprising removing the connection portion after degreasing and sintering the molded body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18663193A JP3329518B2 (en) | 1993-06-30 | 1993-06-30 | Manufacturing method of metal powder injection molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18663193A JP3329518B2 (en) | 1993-06-30 | 1993-06-30 | Manufacturing method of metal powder injection molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0718304A JPH0718304A (en) | 1995-01-20 |
| JP3329518B2 true JP3329518B2 (en) | 2002-09-30 |
Family
ID=16191965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18663193A Expired - Lifetime JP3329518B2 (en) | 1993-06-30 | 1993-06-30 | Manufacturing method of metal powder injection molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3329518B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4617896B2 (en) * | 2005-01-24 | 2011-01-26 | ヤマハ株式会社 | Sound generator for musical instrument and method of manufacturing the same |
| JP2013144824A (en) * | 2012-01-13 | 2013-07-25 | Sumitomo Electric Sintered Alloy Ltd | Method for manufacturing sintered component, and sintered component |
-
1993
- 1993-06-30 JP JP18663193A patent/JP3329518B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0718304A (en) | 1995-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7959706B2 (en) | Manufacturing method of a sintered powder molded body | |
| EP0904920A3 (en) | Method for manufacturing insert-resin-molded product and product produced thereby | |
| US6056915A (en) | Rapid manufacture of metal and ceramic tooling | |
| JPH07164196A (en) | Preparation of japanese horse-chestnut | |
| US5403373A (en) | Hard sintered component and method of manufacturing such a component | |
| JP3329518B2 (en) | Manufacturing method of metal powder injection molded products | |
| US6203734B1 (en) | Low pressure injection molding of metal and ceramic powders using soft tooling | |
| JPH07223211A (en) | Manufacture of metal or ceramic powder sintered product | |
| JPH1192803A (en) | Production of metal and ceramic powder injection-molded parts having hollow part with complicated shape | |
| JP2003183705A5 (en) | ||
| US20020109260A1 (en) | Injection moulding tool and method for production thereof | |
| Kitagawa et al. | Method for manufacturing sintered parts | |
| JPH03232906A (en) | Combined sintered product | |
| JPH0225505A (en) | Production of telescopic die for injection forming | |
| JP2000309808A (en) | Metal parts, and its manufacture | |
| CN219999909U (en) | Shielding cover and preparation equipment | |
| CA2332798A1 (en) | Injection moulding tool and method for the production thereof | |
| JP3865888B2 (en) | Manufacturing method of sintered body with groove | |
| JPH06108106A (en) | Production of sintered parts | |
| CN1301210A (en) | Method for producing shaped bodies | |
| JPH07268407A (en) | Production of metal mold | |
| JP2001140002A (en) | Manufacturing method of metal composite sintered body | |
| JPH05171334A (en) | Hard sintered part and its manufacture | |
| JPH10277704A (en) | Metal injection-forming method with placed core | |
| JPH0791105B2 (en) | Ceramic blade manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080719 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080719 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090719 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100719 Year of fee payment: 8 |
|
| R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110719 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110719 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120719 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120719 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130719 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |