JPH0587144A - Sintered bearing - Google Patents
Sintered bearingInfo
- Publication number
- JPH0587144A JPH0587144A JP25105291A JP25105291A JPH0587144A JP H0587144 A JPH0587144 A JP H0587144A JP 25105291 A JP25105291 A JP 25105291A JP 25105291 A JP25105291 A JP 25105291A JP H0587144 A JPH0587144 A JP H0587144A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- sintered
- sintered bearing
- iron powder
- coating layer
- 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.)
- Withdrawn
Links
Landscapes
- Sliding-Contact Bearings (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属粉末を成形した圧
粉体を焼結した焼結軸受に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered bearing obtained by sintering a green compact molded from metal powder.
【０００２】[0002]
【従来の技術】従来、この種のものとして回転軸が挿通
される軸受孔を形成した二層式の焼結軸受が知られてい
る。この二層式の焼結軸受は、銅の焼結体から成る内層
部の外側に鉄の焼結体から成る外層部が設けられてお
り、前記内層部により回転軸とのなじみをよくし前記外
層部によりコストダウンを図ることができるというもの
である。2. Description of the Related Art Conventionally, as this type, a two-layer type sintered bearing having a bearing hole into which a rotary shaft is inserted is known. In this two-layer type sintered bearing, an outer layer portion made of an iron sintered body is provided on the outer side of an inner layer portion made of a copper sintered body, and the inner layer portion improves compatibility with the rotating shaft. The outer layer portion can reduce the cost.
【０００３】[0003]
【発明が解決しようとする課題】前記従来技術の二層式
の焼結軸受においては、鉄粉末による外層部の強度が低
く軸受の耐荷加重が小さくなるという問題点がある。こ
れは前記二層式の焼結軸受は、銅粉末による内層部と鉄
粉末による外層部とを一体に圧縮した圧粉体を通常 700
℃〜 750℃の温度で焼結するために、銅粉末の焼結は良
好に行われるものの、鉄粉末を所定の温度で焼結できな
いために鉄粉末の焼結が良好に行われないことに起因す
る。このために例えば、鉄粉末による外層部のみの焼結
を考慮して焼結温度を鉄粉末の焼結温度で焼結すること
が考えられるが、このような場合には銅粉末が焼結時に
液相状態となり、この結果焼結体を維持できなくなると
いう問題点が生ずる。The conventional two-layer type sintered bearing has a problem that the strength of the outer layer portion of the iron powder is low and the load bearing load of the bearing is small. This is because the above-mentioned two-layer type sintered bearing is usually made of a green compact made by integrally compressing an inner layer part made of copper powder and an outer layer part made of iron powder.
Since the sintering of the copper powder is performed well at the temperature of ℃ to 750 ° C, the sintering of the iron powder is not performed well because the iron powder cannot be sintered at the predetermined temperature. to cause. For this reason, for example, it is conceivable that the sintering temperature is set to the sintering temperature of the iron powder in consideration of the sintering of only the outer layer portion by the iron powder. There is a problem that the sintered body cannot be maintained as a result of being in a liquid phase state.
【０００４】本発明は、前記問題点を解決して強度が高
く軸受の耐荷加重が大きい焼結軸受を提供することを目
的とする。An object of the present invention is to solve the above problems and to provide a sintered bearing having high strength and high load bearing load.
【０００５】[0005]
【課題を解決するための手段】本発明の焼結軸受は、鉄
粉末の焼結体からなる焼結軸受本体の軸受孔に、銅のコ
ーテング層を形成したものである。The sintered bearing of the present invention has a copper coating layer formed in the bearing hole of a sintered bearing body made of a sintered body of iron powder.
【０００６】[0006]
【作用】前記構成により、前記銅のコーテング層により
回転軸とのなじみをよくしさらに鉄粉末の焼結体により
強度が高く軸受の耐荷加重を大きくできる。With the above-mentioned structure, the copper coating layer improves the compatibility with the rotating shaft, and the sintered body of iron powder has high strength and can increase the load bearing load of the bearing.
【０００７】[0007]
【実施例】次に本発明の一実施例を添付図を参照して説
明する。図１において、１は円筒状の焼結軸受本体であ
り、この焼結軸受本体１は後述するように鉄粉末を圧縮
成形した後焼結して形成されている。前記焼結軸受本体
１の中心軸方向には軸受孔２が形成されると共に、この
軸受孔２には厚みＴが０．２μ〜５０μの銅のコーテン
グ層３が形成されている。An embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a cylindrical sintered bearing body, and this sintered bearing body 1 is formed by compression molding of iron powder and sintering as described later. A bearing hole 2 is formed in the central axis direction of the sintered bearing body 1, and a copper coating layer 3 having a thickness T of 0.2 μ to 50 μ is formed in the bearing hole 2.
【０００８】次に本発明の各工程の一実施例を示す図２
乃至図５を参照して説明する。図２は本発明の第１工程
である金型のキャビティ面に銅箔を付着させた状態を示
し、11はダイであり、このダイ11の中心にはコアロッド
12が、またダイ11の下部には下パンチ13が昇降可能に設
けられている。また前記ダイ11の上方には上パンチ14が
昇降可能に設けられている。そして移動可能な銅箔供給
用シュー15をキャビティ16の上部開口に臨ませて、平面
積が３×１０-5mm2 〜１mm2 、厚みが０．５μ〜２μの
銅箔17Ａを、圧力が３kg／cm2の圧縮空気と共に噴出し
て該銅箔17Ａをキャビティ16面，すなわち、ダイ11、コ
アロッド12及び下パンチ13の上面に付着させ銅箔層17を
形成する。次に第２工程である鉄粉末を充填する状態を
図３で示すように鉄粉末充填用シュー18によりベースメ
タルとしての鉄粉末19Ａがキャビティ16に充填される。
この後第３工程を図４に示すようにコアロッド12、下パ
ンチ13を上昇させると共に、上パンチ14を下降させて銅
箔層17、鉄粉末層19を圧縮して圧粉体10を成形する。そ
して第４工程を図５に示すように前記上パンチ14を上昇
させると共に前記下パンチ13を上昇させることによっ
て、前記圧粉体20をダイ11より取り出す。この後前記圧
粉体20をメッシュベルト（図示せず）などに載置して、
900℃〜1100℃で焼結する。この焼結の際鉄粉末層19は
互いの接触面において拡散しあい空孔21を残して結合す
る。一方前記銅箔層17は、焼結後厚みＴが０．２μ〜
１．５μの銅のコーティング層３、３Ａ、３Ｂを形成す
ると共に、その一部は前記鉄粉末層19側に拡散し合金化
する。すなわち前記銅のコーティング層３、３Ａ、３Ｂ
は焼結軸受本体１の軸受孔２、外周面及び底面に各々形
成される。そして前記焼結軸受本体１は矯正プレスによ
るサイジング等を経た後、真空浸油装置（図示せず）に
よって前記空孔21に油（図示せず）が含浸される。Next, FIG. 2 showing one embodiment of each step of the present invention
It will be described with reference to FIGS. FIG. 2 shows a state in which copper foil is adhered to the cavity surface of the mold which is the first step of the present invention, 11 is a die, and the core of this die 11 is a core rod.
12 and a lower punch 13 is provided below the die 11 so as to be able to move up and down. An upper punch 14 is provided above the die 11 so as to be able to move up and down. Then, the movable copper foil supply shoe 15 is made to face the upper opening of the cavity 16, and the copper foil 17A having a flat area of 3 × 10 −5 mm 2 to 1 mm 2 and a thickness of 0.5 μ to 2 μ is pressed. The copper foil 17A is ejected together with compressed air of 3 kg / cm 2 to adhere to the cavity 16 surface, that is, the upper surface of the die 11, the core rod 12 and the lower punch 13 to form the copper foil layer 17. Next, as shown in FIG. 3, the second step of filling the iron powder is to fill the cavity 16 with the iron powder 19A as the base metal by the iron powder filling shoe 18.
Thereafter, in the third step, as shown in FIG. 4, the core rod 12 and the lower punch 13 are raised, and the upper punch 14 is lowered to compress the copper foil layer 17 and the iron powder layer 19 to form the green compact 10. . Then, in the fourth step, as shown in FIG. 5, the upper punch 14 is raised and the lower punch 13 is raised to take out the green compact 20 from the die 11. Then, the green compact 20 is placed on a mesh belt (not shown) or the like,
Sinter at 900 ℃ ~ 1100 ℃. During this sintering, the iron powder layers 19 diffuse at the contact surfaces of each other and bond together leaving voids 21. On the other hand, the copper foil layer 17 has a thickness T after sintering of 0.2 μm to
Copper coating layers 3, 3A, 3B of 1.5 μm are formed, and part of them diffuses to the iron powder layer 19 side and alloys. That is, the copper coating layers 3, 3A, 3B
Are formed in the bearing hole 2, the outer peripheral surface and the bottom surface of the sintered bearing body 1, respectively. Then, the sintered bearing body 1 is subjected to sizing by a straightening press and the like, and then the holes 21 are impregnated with oil (not shown) by a vacuum oil immersion device (not shown).
【０００９】以上のように、前記実施例においては鉄粉
末層19による圧粉体20の焼結体からなる焼結軸受本体１
の軸受孔２に、厚みＴが０．２μ〜１．５μの銅のコー
テング層３を設けたことにより、前記焼結軸受本体１に
より焼結軸受の強度を向上できるとともに、軸受の負荷
加重を大きくできる。さらに前記軸受孔２に形成した銅
のコーテング層３により回転軸とのなじみがよい焼結軸
受を提供できる。As described above, in the above-described embodiment, the sintered bearing body 1 made of the sintered body of the green compact 20 made of the iron powder layer 19 is used.
By providing the copper coating layer 3 having a thickness T of 0.2 μm to 1.5 μm in the bearing hole 2 of 1., the strength of the sintered bearing can be improved by the sintered bearing body 1 and the load load of the bearing can be improved. Can be made bigger. Further, the copper coating layer 3 formed in the bearing hole 2 can provide a sintered bearing having good compatibility with the rotating shaft.
【００１０】さらに前記銅のコーテング層３、３Ａ，３
Ｂは軸受孔２のみならず、焼結軸受本体１の外周面及び
底面にも各々形成されるために、各種機器に焼結軸受を
固定した際、回転軸とコーティング層３間の摩擦熱は熱
伝導性に優れるコーティング層３Ｂ、３Ａを介して機器
側に熱伝導できるため、熱の放散性に優れる。Further, the copper coating layers 3, 3A, 3
Since B is formed not only on the bearing hole 2 but also on the outer peripheral surface and the bottom surface of the sintered bearing main body 1, when the sintered bearing is fixed to various devices, frictional heat between the rotary shaft and the coating layer 3 is not generated. Since heat can be conducted to the device side through the coating layers 3B and 3A having excellent thermal conductivity, the heat dissipation property is excellent.
【００１１】尚、本発明は前記実施例に限定されるもの
ではなく、例えばキャビティ内に銅箔を充填した後に、
吸引装置などによって銅箔を吸い取り、残り銅箔により
前記コーティング層を形成してもよく、またコアロッド
のみに銅箔を付着させて軸受孔のみに銅のコーティング
層を形成したり、さらに焼結軸受本体１の前面に銅のコ
ーティング層を形成するなど各種の変形が可能である。The present invention is not limited to the above-mentioned embodiment. For example, after filling the cavity with copper foil,
The copper foil may be sucked with a suction device and the remaining copper foil may be used to form the coating layer. Alternatively, the copper foil may be adhered only to the core rod to form the copper coating layer only in the bearing hole, or the sintered bearing. Various modifications are possible such as forming a copper coating layer on the front surface of the main body 1.
【００１２】[0012]
【発明の効果】本発明は、鉄粉末の焼結体からなる焼結
軸受本体の軸受孔に、銅のコーテング層を形成したこと
により、回転軸とのなじみが良く、強度の大きい焼結軸
受を提供できる。EFFECTS OF THE INVENTION According to the present invention, a sintered bearing main body made of a sintered body of iron powder is provided with a copper coating layer in the bearing hole. Can be provided.
【図１】本発明の一実施例を示す一部を拡大した焼結軸
受の斜視図である。FIG. 1 is a perspective view of a partially enlarged sintered bearing showing an embodiment of the present invention.
【図２】本発明の第１工程を示す断面図である。FIG. 2 is a sectional view showing a first step of the present invention.
【図３】本発明の第２工程を示す断面図である。FIG. 3 is a sectional view showing a second step of the present invention.
【図４】本発明の第３工程を示す断面図である。FIG. 4 is a sectional view showing a third step of the present invention.
【図５】本発明の第４工程を示す断面図である。FIG. 5 is a sectional view showing a fourth step of the present invention.
１ 焼結軸受本体 ２ 軸受孔 ３ コーテング層 1 Sintered bearing body 2 Bearing hole 3 Coating layer
Claims (1)
軸受孔に、銅のコーテング層を形成したことを特徴とす
る焼結軸受。1. A sintered bearing characterized in that a coating layer of copper is formed in a bearing hole of a sintered bearing body made of a sintered body of iron powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25105291A JPH0587144A (en) | 1991-09-30 | 1991-09-30 | Sintered bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25105291A JPH0587144A (en) | 1991-09-30 | 1991-09-30 | Sintered bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0587144A true JPH0587144A (en) | 1993-04-06 |
Family
ID=17216907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25105291A Withdrawn JPH0587144A (en) | 1991-09-30 | 1991-09-30 | Sintered bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0587144A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2356222A1 (en) * | 2011-02-15 | 2011-04-06 | Sinterizados Y Metalurgia De Solsona, S.A. | Method for producing sintered sliding bearings |
-
1991
- 1991-09-30 JP JP25105291A patent/JPH0587144A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2356222A1 (en) * | 2011-02-15 | 2011-04-06 | Sinterizados Y Metalurgia De Solsona, S.A. | Method for producing sintered sliding bearings |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981203 |