JP3164143B2 - Manufacturing method of sintered parts - Google Patents
Manufacturing method of sintered partsInfo
- Publication number
- JP3164143B2 JP3164143B2 JP02543796A JP2543796A JP3164143B2 JP 3164143 B2 JP3164143 B2 JP 3164143B2 JP 02543796 A JP02543796 A JP 02543796A JP 2543796 A JP2543796 A JP 2543796A JP 3164143 B2 JP3164143 B2 JP 3164143B2
- Authority
- JP
- Japan
- Prior art keywords
- peripheral surface
- manufacturing
- ring
- outer peripheral
- powder compact
- 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
【発明の属する技術分野】本発明は、焼結部品の製造方
法に関するものである。The present invention relates to a method for manufacturing a sintered part.
【従来の技術】一般に焼結部品を製造する場合には、金
属粉を用いて所定の形状に粉末成形体を成形し、焼結し
た後の焼結体をサイジング対象素材とし、このサイジン
グ対象素材を仕上げ寸法の最終形状に成形できる成形型
面をもつダイスを備えたサイジング金型に入れてサイジ
ングを施す。このサイジングにより、サイジング対象部
材を所定寸法の焼結部品に仕上げることができる。ま
た、焼結部品の密度を高くすると硬さ、引張強度などが
向上し高強度の部品となることが知られており、高強度
の焼結部品を得るために焼結の工程を、仮焼結、圧縮、
本焼結の２段階の焼結工程を取り入れる製造方法や、サ
イジングの代わりに熱間鍛造を経て切削により所定寸法
精度の製品に仕上げる製造方法などが知られている。2. Description of the Related Art Generally, when manufacturing a sintered part, a powder compact is formed into a predetermined shape using metal powder, and the sintered body after sintering is used as a sizing target material. Is placed in a sizing mold provided with a die having a mold surface capable of forming the final shape of the finished dimensions. By this sizing, the sizing target member can be finished into a sintered part having a predetermined size. It is also known that increasing the density of sintered parts increases the hardness, tensile strength, etc., and results in high-strength parts. Knot, compression,
There are known a manufacturing method that incorporates a two-stage sintering process of main sintering, and a manufacturing method that finishes a product having predetermined dimensional accuracy by cutting through hot forging instead of sizing.
【発明が解決しようとする課題】上記従来技術のような
製造方法においては、粉末成形体の形状は焼結時におけ
る成形体の歪み、収縮、変形等を考慮した大きさに設定
することが一般的で、その形状は製品形状に合わせた形
状となっている。従って、焼結部品の強度は、製品肉厚
や製品形状、金属粉の素材選定、焼結方法等の条件に従
って決定され、製造方法によって焼結部品の強度を調節
することは不可能であった。つまり、一般的に製品形状
については設計段階で決定するものであり製造段階で変
更することはできず、また、金属粉の素材、金属粉の投
入量、焼結方法等の条件の変更は、コストアップや製造
プロセスが長くなるなどの問題が発生していた。In a manufacturing method such as the above-mentioned prior art, the shape of a powder compact is generally set to a size in consideration of distortion, shrinkage, deformation, etc. of the compact during sintering. The shape is a shape that matches the product shape. Therefore, the strength of the sintered part is determined according to the conditions such as the product thickness, the product shape, the material selection of the metal powder, and the sintering method, and it is impossible to adjust the strength of the sintered part by the manufacturing method. . In other words, in general, the product shape is determined at the design stage and cannot be changed at the manufacturing stage.Also, the change of the conditions such as the material of the metal powder, the amount of the metal powder input, the sintering method, etc. There have been problems such as an increase in cost and a lengthening of the manufacturing process.
【課題を解決するための手段】上記した課題を解決する
ために請求項１の発明において講じた手段は、金属粉末
を型内へ充填し所定の圧力で圧縮して粉末成形体を形成
し、粉末成形体を溶融点以下の高温で焼結体とし、焼結
体を型内で再圧縮して円環形状の成形品の寸法精度を整
えるサイジングを行う焼結部品の製造方法において、粉
末成形体を形成する際に前記成形品の強度を要求される
内周面または外周面に向かって径方向に肉厚が増すよう
なテーパー部を設け、テーパー部のテーパー角度が５°
以下の角度であり、サイジングを行う際にテーパー部を
押し潰し且つ寸法精度を整えるように再圧縮することを
特徴とする焼結部品の製造方法としたことである。この
ような製造方法とすることにより、サイジングの際にテ
ーパー部を押し潰すように寸法を整えるので、粉末成形
体のテーパー部により肉厚が増している部分については
高密度となり、高強度の部材とすることができ、且つテ
ーパー角度が５°以下の角度であれば角度に比例した密
度が得られるのに対し、５°以上の角度にしても製品全
体の密度が高くなり、強度を必要とする側面の密度の変
化が少なくなるので、粉末成形体の成形も難しくなる。In order to solve the above-mentioned problems, a means taken in the invention of claim 1 is to fill a metal powder into a mold and compress it at a predetermined pressure to form a powder compact, In the method of manufacturing a sintered part, the powder compact is made into a sintered body at a high temperature below the melting point, and the sintered body is recompressed in a mold and sizing is performed to adjust the dimensional accuracy of the annular molded product. required strength of the molded article during the formation of the body
A taper portion is provided such that the thickness increases in the radial direction toward the inner peripheral surface or the outer peripheral surface, and the taper angle of the taper portion is 5 °.
The method of manufacturing a sintered component according to the present invention is characterized in that the taper portion is crushed when sizing is performed and recompression is performed so as to adjust dimensional accuracy. By adopting such a manufacturing method, dimensions are adjusted so as to crush the tapered portion during sizing, so that the portion where the wall thickness is increased due to the tapered portion of the powder molded body has a high density and a high strength member. If the taper angle is 5 ° or less, a density proportional to the angle can be obtained, whereas if the taper angle is 5 ° or more, the density of the entire product increases, and strength is required. Since the change in the density of the side surface to be formed is reduced, it becomes difficult to form the powder compact.
【発明の実施の形態】本発明に係る実施の形態を図面に
基づいて説明する。図１には、本発明の製造方法を用い
て、粉末の金属材料よりリング１を成形する場合の製造
工程が示されている。図１に断面図を示したリング１の
サイズは、幅１０．５０（単位はミリメートル、以下単
に「ミリ」と称す）、肉厚１８．００ミリ、直径が８５
ミリである。図１に基づき本発明の製造方法を工程に沿
って説明すると、型内に粉末の金属材料を充填し５〜７
トン／センチメートル程度の所定の圧力で圧縮すること
で粉末形成体を成形する。このとき、リング１の外周面
２の肉厚を１９．０ミリとし、リング１の内周面３の肉
厚を２０．５ミリとし、リング１の上面４及びリング１
の下面５のそれぞれを４°の角度のテーパー面を形成す
る。次に、この粉末形成体を１１５０℃の雰囲気中に３
０分間放置して焼結体とする。最後に、この焼結体をリ
ング１の外周面２を図示しないダイスにより拘束し、リ
ング１の内周面３をロッドによってリング１の幅を１
０．５０ミリとすると同時に、リング１の上面４及びリ
ング１の下面５のそれぞれ上パンチ、下パンチで挟むよ
うに再圧縮してリング１の肉厚を１８．００ミリに整え
るようにサイジングする。図２には、図１に示した本発
明の製造方法において、粉末成形体を形成する際にリン
グ１の上面４及び下面５のテーパー角度を１°から６°
の範囲で１°毎に変化させた場合におけるリング１の外
周面２とリング１の内周面３との密度を測定し、その変
化をグラフに示したものである。このグラフから明らか
なように、実線で示した内周面３の密度と破線で示した
外周面２の密度は、テーパー角度の増加に伴って密度も
増している。また、１°から６°の全てのテーパー角度
においても、内周面３の密度は外周面２の密度に比べて
大きくなっている。従って、このように成形したリング
１は、スプライン係合する部材の外歯のように、リング
１の内周面３に歯が切られ、内周面３において強い負荷
のかかる部材に適している。更に、図２におけるテーパ
ー角度が５°と６°との内周面３と外周面２のそれぞれ
の密度を比較すると、内周面３の密度の増加率が少ない
のに対し外周面２の密度の増加率が大きくなっている。
このような値が得られる要因としては、テーパー角度が
大きくなることにより、外周面２の肉厚に比べて内周面
３の肉厚が極端に大きくなり、サイジングにおける圧力
によって、内周面３の材料が外周面２の方向に一気に流
れ込むことにより、内周面３の密度を向上させるという
粉末成形体を形成する際のテーパー面を設けた意図とは
無関係に、外周面２の密度が高くなってしまうものと推
察される。このことから、リング１を成形するときにリ
ングの一側の密度を高くするためには、テーパー角度を
５°以下の範囲で粉末成形体を形成することがムリ、ム
ダのない好ましい条件と判断される。また、図１におけ
る実施の形態が内周面３において強い負荷のかかる部材
に本件発明を適用した場合の説明に対して、図３、図４
における実施の形態は、それぞれ直径８５ミリ、肉厚１
８ミリのアウターレース６、直径２６ミリ、肉厚２２ミ
リのギヤ８に本発明を適用した焼結部品の図である。こ
れらは部品として使用する際に外周面に負荷のかかる部
品であり、粉末成形体を成形するときに外周面の肉厚が
大きくなるようにテーパー角度を設けてサイジングされ
る。サイジングの際にアウターレース６の外周面の切り
込み、ギヤ７の外周面の歯を成形することができる。な
お、図１に示した本発明の実施の形態においては、粉末
成形体を成形するときのテーパー角度を設ける面をリン
グ１の上面４及びリング１の下面５のそれぞれに設けた
が、上面４または下面５の一方の面にだけテーパー面を
設けても、密度を高くするための十分な効果を得ること
ができる。An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 shows a manufacturing process when a ring 1 is formed from a powdered metal material using the manufacturing method of the present invention. The size of the ring 1 whose cross-sectional view is shown in FIG. 1 is 10.50 (unit is millimeter, hereinafter simply referred to as “mm”), wall thickness is 18.00 mm, and diameter is 85.
Millimeters. The manufacturing method of the present invention will be described along the steps with reference to FIG.
The powder compact is formed by compressing at a predetermined pressure of about ton / cm. At this time, the thickness of the outer peripheral surface 2 of the ring 1 is 19.0 mm, the thickness of the inner peripheral surface 3 of the ring 1 is 20.5 mm, and the upper surface 4 of the ring 1 and the ring 1
Each of the lower surfaces 5 is formed as a taper surface having an angle of 4 °. Next, this powder compact was placed in an atmosphere at 1150 ° C. for 3 hours.
Leave for 0 minute to obtain a sintered body. Finally, the sintered body is constrained on the outer peripheral surface 2 of the ring 1 by a die (not shown), and the inner peripheral surface 3 of the ring 1 is reduced in width by a rod to 1
At the same time as 0.50 mm, the upper surface 4 of the ring 1 and the lower surface 5 of the ring 1 are recompressed so as to be sandwiched by the upper punch and the lower punch, respectively, and the ring 1 is sized so as to have a thickness of 18.00 mm. . FIG. 2 shows that the taper angle of the upper surface 4 and the lower surface 5 of the ring 1 is changed from 1 ° to 6 ° in the production method of the present invention shown in FIG.
The density of the outer peripheral surface 2 of the ring 1 and the inner peripheral surface 3 of the ring 1 are measured when the angle is changed every 1 ° within the range described above, and the change is shown in a graph. As is apparent from this graph, the density of the inner peripheral surface 3 shown by the solid line and the density of the outer peripheral surface 2 shown by the broken line also increase as the taper angle increases. Also, at all taper angles from 1 ° to 6 °, the density of the inner peripheral surface 3 is higher than the density of the outer peripheral surface 2. Therefore, the ring 1 thus formed is suitable for a member in which teeth are cut on the inner peripheral surface 3 of the ring 1 and a heavy load is applied on the inner peripheral surface 3, such as the external teeth of a member that engages with a spline. . Further, comparing the respective densities of the inner peripheral surface 3 and the outer peripheral surface 2 at the taper angles of 5 ° and 6 ° in FIG. 2, the increase rate of the density of the inner peripheral surface 3 is small, while the density of the outer peripheral surface 2 is small. The rate of increase is increasing.
The reason why such a value is obtained is that, as the taper angle increases, the thickness of the inner peripheral surface 3 becomes extremely larger than the thickness of the outer peripheral surface 2, and the inner peripheral surface 3 Irrespective of the intention of providing a tapered surface when forming a powder compact, which is to improve the density of the inner peripheral surface 3 by flowing the material at a stretch in the direction of the outer peripheral surface 2, the density of the outer peripheral surface 2 is high. It is presumed that it will be. Accordingly, in order to increase the density of one side of the ring when forming the ring 1, it is determined that forming a powder compact within a taper angle of 5 ° or less is a preferable condition without waste and waste. Is done. Also, in the case where the embodiment of FIG. 1 applies the present invention to a member having a strong load on the inner peripheral surface 3, FIGS.
In the embodiment, the diameter is 85 mm and the wall thickness is 1 mm, respectively.
It is a figure of the sintered part which applied this invention to the gear 8 of the outer race 6 of 8 mm, the diameter of 26 mm, and the wall thickness of 22 mm. These are components that exert a load on the outer peripheral surface when used as components, and are sized with a taper angle so as to increase the thickness of the outer peripheral surface when molding a powder compact. Cutting the outer peripheral surface of the outer race 6 when sizing
In addition, the teeth on the outer peripheral surface of the gear 7 can be formed. In addition, in the embodiment of the present invention shown in FIG. 1, the surface for providing the taper angle at the time of molding the powder compact is provided on each of the upper surface 4 of the ring 1 and the lower surface 5 of the ring 1. Alternatively, even if a tapered surface is provided only on one surface of the lower surface 5, a sufficient effect for increasing the density can be obtained.
【発明の効果】上記した請求項１の発明によれば、粉末
成形体を形成する際に円環形状の成形品の強度を要求さ
れる内周面または外周面に向かって径方向に肉厚が増す
ようなテーパー部を設け、テーパー部のテーパー角度が
５°以下の角度であり、サイジングを行う際にこのテー
パー部を押し潰すように寸法精度を整えるようにしたの
で、肉厚を大きくした部分の密度を増加させることがで
き、強度を要求される部位（内周面または外周面）にお
いて効率的に高い強度とすることができ、且つ肉厚を増
やした金属材料が余分な部位に流れることなく、強度を
必要とする部位の密度を確実に向上させることができ
る。また、焼結部品の強度を向上させるために、焼結工
程を長くしたり、金属粉末の種類や投入量を大幅に変更
する必要もなくなる。According to the first aspect of the present invention, when forming a powder compact, the strength of the annular molded product is increased in the radial direction toward the required inner or outer peripheral surface. The taper angle of the taper portion is 5 ° or less, and the dimensional accuracy is adjusted so that the taper portion is crushed when sizing, so the wall thickness is increased. The density of the portion can be increased, the strength can be efficiently increased at a portion (the inner peripheral surface or the outer peripheral surface) where the strength is required, and the metal material having the increased thickness flows to an extra portion. Therefore, it is possible to surely increase the density of the parts requiring strength. In addition, it is not necessary to lengthen the sintering process or to significantly change the type and input amount of the metal powder in order to improve the strength of the sintered component.
【図１】本発明の第１の実施の形態であるリングを焼結
成形する概要を示したものである。FIG. 1 shows an outline of sinter molding a ring according to a first embodiment of the present invention.
【図２】図１におけるテーパー角度の相違と密度との関
係を示すグラフである。FIG. 2 is a graph showing the relationship between the difference in taper angle and the density in FIG.
【図３】本発明の製造方法により焼結製造できるアウタ
ーレースの形状を示したものである。FIG. 3 shows the shape of an outer race that can be manufactured by sintering according to the manufacturing method of the present invention.
【図４】本発明の製造方法により焼結製造できるギヤの
形状を示したものである。FIG. 4 shows the shape of a gear that can be manufactured by sintering according to the manufacturing method of the present invention.
１・・・リング ２・・・リングの外周面 ３・・・リングの内周面 ４・・・リングの上面 ５・・・リングの下面 ６・・・アウターレース ７・・・ギヤ DESCRIPTION OF SYMBOLS 1 ... Ring 2 ... Outer peripheral surface of ring 3 ... Inner peripheral surface of ring 4 ... Upper surface of ring 5 ... Lower surface of ring 6 ... Outer race 7 ... Gear
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B22F 3/24 101 B22F 5/06 B22F 5/10 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B22F 3/24 101 B22F 5/06 B22F 5/10
Claims (1)
縮して粉末成形体を形成し、該粉末成形体を溶融点以下
の高温で焼結体とし、該焼結体を型内で再圧縮して円環
形状の成形品の寸法精度を整えるサイジングを行う焼結
部品の製造方法において、前記粉末成形体を形成する際
に前記成形品の強度を要求される内周面または外周面に
向かって径方向に肉厚が増すようなテーパー部を設け、
該テーパー部のテーパー角度が５°以下の角度であり、
前記サイジングを行う際に前記テーパー部を押し潰し且
つ寸法精度を整えるように再圧縮することを特徴とする
焼結部品の製造方法。1. A metal powder is filled in a mold, compressed at a predetermined pressure to form a powder compact, and the powder compact is formed into a sintered body at a high temperature below a melting point. Recompress the ring with
In the method for manufacturing sintered parts of sizing to arrange the molded article the dimensional accuracy of the shape, the radial direction toward said the inner peripheral surface or outer peripheral surface which is required the strength of the molded article at the time of forming the powder compact Providing a tapered part that increases the thickness,
The taper angle of the taper portion is an angle of 5 ° or less,
A method of manufacturing a sintered part, comprising: squeezing and recompressing the tapered portion to adjust dimensional accuracy when performing the sizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02543796A JP3164143B2 (en) | 1996-02-13 | 1996-02-13 | Manufacturing method of sintered parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02543796A JP3164143B2 (en) | 1996-02-13 | 1996-02-13 | Manufacturing method of sintered parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09217102A JPH09217102A (en) | 1997-08-19 |
| JP3164143B2 true JP3164143B2 (en) | 2001-05-08 |
Family
ID=12165976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02543796A Expired - Fee Related JP3164143B2 (en) | 1996-02-13 | 1996-02-13 | Manufacturing method of sintered parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3164143B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998056526A1 (en) * | 1997-06-12 | 1998-12-17 | Hitachi Powdered Metals Co., Ltd. | Sheet metal member, method of manufacturing same, and heat radiation plate |
-
1996
- 1996-02-13 JP JP02543796A patent/JP3164143B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09217102A (en) | 1997-08-19 |
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