JP2021008931A - 焼結軸受および焼結軸受の製造方法 - Google Patents
焼結軸受および焼結軸受の製造方法 Download PDFInfo
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- aluminum
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- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000000843 powder Substances 0.000 claims abstract description 71
- 238000005245 sintering Methods 0.000 claims abstract description 66
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims abstract description 55
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 42
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 claims abstract description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 35
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000010949 copper Substances 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 15
- 239000011574 phosphorus Substances 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 229910000906 Bronze Inorganic materials 0.000 abstract description 9
- 239000010974 bronze Substances 0.000 abstract description 9
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 4
- 239000004411 aluminium Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 15
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 229910001634 calcium fluoride Inorganic materials 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 239000010687 lubricating oil Substances 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004513 sizing Methods 0.000 description 6
- 229910001096 P alloy Inorganic materials 0.000 description 5
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 229910017111 AlOF Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical group [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920013639 polyalphaolefin Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- 229910016569 AlF 3 Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum-phosphorus-copper Chemical compound 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/121—Use of special materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0425—Copper-based alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
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- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
- F16C33/104—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing in a porous body, e.g. oil impregnated sintered sleeve
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- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1095—Construction relative to lubrication with solids as lubricant, e.g. dry coatings, powder
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- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/128—Porous bearings, e.g. bushes of sintered alloy
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- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
- F16C33/145—Special methods of manufacture; Running-in of sintered porous bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- F16C2202/00—Solid materials defined by their properties
- F16C2202/50—Lubricating properties
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Abstract
Description
アルミニウム−銅合金粉末としては、銅とアルミニウムの完全合金粉末を粉砕した後、粒度調整したものが使用される。具体的には、7〜17質量%アルミニウム−銅合金粉末、好ましくは8.5〜12質量%アルミニウム−銅合金粉末を使用することができる。合金化された粉末を使用しているので、比重の小さいアルミニウム単体粉の飛散に伴う取り扱い上の問題はない。アルミニウム−銅合金粉末の粒径は100μm以下で、平均粒径は35μm程度である。
燐合金粉末としては燐−銅合金粉末、例えば7〜10質量%燐−銅合金粉末が用いられる。燐は、焼結時の固相−液相間の濡れ性を高めると共に、焼結過程でのアルミニウム−銅合金の焼結を促進させる効果を有する。焼結軸受における燐の含有量は0.05〜0.6質量%、好ましくは0.1〜0.4質量%とする。燐の含有量が0.05質量%未満では固液相間の焼結促進効果が乏しくなり、燐の含有量が0.6質量%を超えると、焼結が進みすぎてγ相の析出が増えるため、焼結体が脆くなる。
黒鉛は、主として素地に分散分布する気孔内に遊離黒鉛として存在し、焼結軸受に優れた潤滑性を付与し、耐摩耗性の向上に寄与する。黒鉛の配合量は、アルミニウム−銅合金粉末、および燐合金粉末の合計100質量%(100質量部)に対して、3〜10質量%(3〜10質量部)、好ましくは3〜6質量%(3〜6質量部)とする。アルミニウム3質量%(3質量部)未満では、黒鉛添加による潤滑性、耐摩耗性の向上効果が得られない。一方、10質量%(10質量部)を超えると、アルミニウムの銅への拡散が阻害され、強度低下を招く。黒鉛粉として、造粒黒鉛粉を使用することにより、黒鉛粉を原料粉末に4質量%(4質量部)以上添加する場合の成形性の悪化を防止することができる。造粒黒鉛粉は、天然黒鉛又は人造黒鉛の微粉を樹脂バインダで造粒した後、粉砕したものである。黒鉛粉として、粒径145メッシュ以下のものを使用するのが好ましい。
アルミニウム−銅合金粉末の焼結時には、粒子表面に生成する酸化アルミニウムの被膜が焼結を著しく阻害する。フッ化アルミニウム(AlF3)の粉末は、アルミニウム−銅合金粉末の焼結温度である880℃〜1000℃で溶融しながら徐々に蒸発し、アルミニウム−銅合金粉末の表面を保護して酸化アルミニウムの生成を抑制することにより、焼結を促進し、アルミニウムの拡散を増進させる。フッ化アルミニウムは、焼結時に蒸発、揮散するので、焼結後の焼結体には殆ど残らない。原料粉末におけるフッ化アルミニウムの配合割合は、アルミニウム−銅合金粉末および燐合金粉末の合計100質量%(100質量部)に対して0.05〜0.3質量%(0.05〜0.3質量部)が好ましい。フッ化アルミニウムの配合量が0.05質量%(0.05質量部)を下回ると、酸化アルミニウムの生成を抑制することが困難となる。フッ化アルミニウムの配合量が0.3質量%(0.3質量部)を超えると、酸化アルミニウムの生成を抑制する効果が飽和する(8.5〜12質量%アルミニウム−銅合金粉末を使用する場合)。
フッ化カルシウム(CaF2)は、燐との共存下で触媒のような作用を呈して、例えばフッ化アルミニウムの焼結助剤として焼結促進に寄与する。フッ化カルシウムの配合割合は、アルミニウム−銅合金粉末、および燐合金粉末の合計100質量%に対して0.01〜0.2質量%(0.01〜0.2質量部)程度が好ましい。フッ化カルシウムの配合量が0.01質量%(0.01質量部)を下回ると、フッ化アルミニウムの焼結助剤としての効果が得られ難い。フッ化カルシウムの配合量が0.2質量%(0.2質量部)を上回ると、フッ化カルシウム粒子として焼結体内に残る。
原料粉末準備工程S1では、焼結軸受1の原料粉末が準備・生成される。原料粉末の生成に際しては、3〜13質量%のアルミニウムおよび0.05〜0.6質量%の燐を含有し、残部の主成分を銅および炭素とし、さらに不可避的不純物を含む焼結体が得られるように各粉末が配合され、混合される。例えば、上記アルミニウム−銅合金粉末を90〜97質量%(90〜97質量部)、上記燐−銅合金粉末を3〜10質量%(3〜10質量部)とする合計100質量%(100質量部)に対して、黒鉛粉末を3〜6質量%(3〜6質量部)、フッ化アルミニウムを0.05〜0.3質量%(0.05〜0.3質量部)、フッ化カルシウムを0.01〜0.2質量%(0.01〜0.2質量部)、成形性を容易にするための潤滑剤としてステアリン酸亜鉛を0.1〜1.0質量%(0.1〜1.0質量部)添加したものが原料粉末として使用される。
圧粉工程では、上記の原料粉末を圧縮成形することにより、焼結軸受1の形状に対応した形状を有する圧粉体1’(図3(a)(b)参照)を形成する。
焼結工程では、圧粉体を焼結温度で加熱し、隣接する原料粉末同士を焼結結合させることによって焼結体を形成する。焼結を行う焼結炉として、例えば図2に示すメッシュベルト式連続炉10を使用することができる。
サイジング工程では、焼結により圧粉体1’と比較して膨張した焼結体を軸方向および半径方向に圧縮して寸法整形する。サイジング加工により、膨張した焼結体の表層の気孔をつぶし、芯部と表層部に密度差を生じさせる。従って、サイジング加工後は、図1に示すように、焼結軸受1の表層部(ハッチングを付した領域)は圧縮層となり、外径面1b側の表層部の圧縮層Poの密度および軸受面1a側の表層部の圧縮層Piの密度は、いずれも芯部1cの密度より高くなる。
含油工程は、製品1(焼結軸受)に潤滑油を含浸する工程である。含油装置のタンク内に製品1を投入し、その後、潤滑油をタンク内に注入する。そして、タンク内を減圧することにより、製品1の気孔内に潤滑油を含浸する。これにより、多孔質をなす焼結軸受の各気孔に潤滑油が保持された状態となるため、運転開始時より良好な潤滑状態を得ることができる。潤滑油としては鉱油、ポリαオレフィン(PAO)、エステル、液状グリース等を使用することができる。ただし、含油工程は軸受の使用用途に応じて実施すればよく、用途によっては含油工程を省略することもできる。
1a 軸受面
1c 芯部
1’ 圧粉体
2 軸
3 アルミニウム−銅合金組織
4 酸化アルミニウム被膜
5 黒鉛
10 焼結炉
20 容器(蓋付きトレイ)
21 トレイ
22 蓋
23 閉鎖空間
Claims (9)
- アルミニウム−銅合金が焼結された組織を有し、3〜13質量%のアルミニウムおよび0.05〜0.6質量%の燐を含有し、残部の主成分を銅とし、不可避不純物を含んだ焼結体からなる焼結軸受において、
芯部の粒界で酸化アルミニウム被膜が取り除かれ、200MPa以上の圧環強さを有することを特徴とする焼結軸受。 - HRF30以上の硬さを有する請求項1に記載の焼結軸受。
- 密度が5.6g/cm3以上、6.2g/cm3以下である請求項1または2に記載の焼結軸受。
- さらに遊離黒鉛を有する請求項1〜3の何れか1項に記載の焼結軸受。
- フッ化アルミニウムを含む原料粉末を焼結することで形成され、アルミニウム−銅合金が焼結された組織を有し、3〜13質量%のアルミニウムおよび0.05〜0.6質量%の燐を含有し、残部の主成分を銅とし、不可避不純物を含んだ焼結軸受の製造方法であって、
前記焼結を閉鎖空間で行い、かつ前記原料粉末に含まれるフッ化アルミニウムが前記閉鎖空間で全てガス化したと仮定した時の当該フッ化アルミニウムガスの濃度を管理して前記焼結を行うことを特徴とする焼結軸受の製造方法。 - 前記フッ化アルミニウムガスの濃度が5ppm以上となるように管理して前記焼結を行う請求項5に記載の焼結軸受の製造方法。
- 前記閉鎖空間に複数の圧粉体を配置し、前記閉鎖空間の容積に対する前記複数の圧粉体の総容積の比を5%以上にして前記焼結を行う請求項5または6に記載の焼結軸受の製造方法。
- 前記閉鎖空間を、複数の圧粉体を収容可能な容器本体と、該容器本体に着脱可能の蓋とで形成した請求項5〜7の何れか1項に記載の焼結軸受の製造方法。
- 前記原料粉末に前記フッ化アルミニウムを0.05〜0.3質量%含有させた請求項5〜8の何れか1項に記載の焼結軸受の製造方法。
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