1 ࢭ࣑ࣛࢵࢡ㍈ཷࡢ㧗 ᑑ≉ᛶ㛵ࡍࡿ◊✲㸦➨ ሗ㸧 ㄽ ᩥ Article
ࢭ࣑ࣛࢵࢡ㍈ཷࡢ㧗 ᑑ≉ᛶ㛵ࡍࡿ◊✲㸦➨
1 ሗ㸧
̿㧗 ࣭↓₶࠾ࡅࡿᇶᮏືᐃ᱁Ⲵ㔜̿ ཎ✏ཷ ᖺ ᭶ ᪥ ࡶࡢࡘࡃࡾᏛ⣖せ ➨ ྕ㸦㸧㹼ᕷᕝⱱᶞ
*1㸪ᕝཱྀᝅྐ
*2㸪℩ᒣ▱ு
*3 *1 ࡶࡢࡘࡃࡾᏛ ᢏ⬟ᕤⱁᏛ㒊 〇㐀Ꮫ⛉ *2 ⯟✵⮬⾨㝲➨ 1 㧗ᑕ⩌ᩚഛ⿵⤥㝲 *3 ᰴᘧ♫ ๓ᕝ〇సᡤStudies on high-temperature life property of the ceramic bearing (Part 1)
̿ The basic load rating of the lubricating in high-temperature atmospheric air ̿ Shigeki ICHIKAWA *1, Satoshi KAWAGUCHI*2 and Hajime SEYAMA*3
*1 Dept. of Manufacturing Technologists, Institute of Technologists *2 JASDF 1st Air Defence Missile Group
*3 MAEKAWA MFG.CO.,LTD
Abstract Practical use level has the ceramic bearing which is superior in a high temperature characteristic, and it is
important to demand the rating lift of the ceramic bearing under various conditions. On the other hand, the staircase method is one of the statistical life test methods, and sample number a fewer than a conventional test method and the practice for the short time are possible. In a report of the application of this staircase method, we discussed the rating lift of the ceramic bearings in the unlubricated conditions with a high-temperature in the atmospheric air.
Key Words : ceramic rolling bearings, life test, basic dynamic load rating, staircase method
2 7KH%XOOHWLQRI,QVWLWXWHRI7HFKQRORJLVWV1R ࡃ㍈ཷࡢᐃ᱁ᑑ➼ࡢㅖᩘ್ࢆồࡵࡿ᪉ἲࡢᐇ⏝ ࢆ┠ᣦࡋ࡚࠸ࡿ㸬ᮏሗ࿌࡛ࡣ㸪㧗 ᇦ࠾ࡅࡿ ₶ࡢ᭷↓ࡸ㍈ཷᮦ㉁ࡘ࠸᳨࡚ウࡋ㸪ྛ✀㍈ཷ ࡢᦶ⪖≉ᛶࢆ᫂ࡽࡍࡿࡶࢫࢸࢣ࣮ࢫ ἲࡼࡿᐃ᱁ᑑࡢㅖᩘ್ࢆồࡵᇶᮏࢹ࣮ࢱࡢᵓ ⠏ࢆᅗࡿ㸬
㸬ࢫࢸࢣ࣮ࢫἲࡼࡿᑑヨ㦂
ヨ㦂᪉ἲ࠾ࡼࡧᡭ㡰 ᅗ㸯L ࡣ㸪 ಶࡢࢧࣥࣉࣝࢆ⏝࠸࡚ࢫࢸࢣ࣮ ࢫἲࢆᐇࡋࡓࡁࡢヨ㦂᪉ἲࡑࡢࡁࡢ☜⋡ ࢆ♧ࡍ㸬ᅗ୰ࡢṇつศᕸ࠾ࡅࡿSL
ࡣ◚ቯࡋࡓ☜ ⋡㸪TL
ࡣᮍ◚ቯࡢ☜⋡࡛࠶ࡾ㸪᭱ึཧ⪃࡞ࡿ ࢹ࣮ࢱࡽȣ㏆࠸ᛮࢃࢀࡿ➨㸯␒┠ࡢⲴ㔜 <࡛ヨ㦂ࢆᐇࡍࡿ㸬ࡇࡢࡁ᮲௳࡛ᐃࡵࡓᡴ ࡕษࡾᅇᩘࡲ࡛ヨ㦂∦ࡀ◚ቯࡋࡓ࡞ࡽⲴ㔜ࢆ G ࡔࡅୗࡆ㸪㏫ᮍ◚ቯ࡛࠶ࡗࡓ࡞ࡽⲴ㔜ࢆGࡔࡅ ୖࡆ࡚➨ ␒┠ࡢヨ㦂ࢆᐇࡍࡿ㸬ࡇࡢ᧯సࢆ⏝ ពࡋࡓࢧࣥࣉࣝᩘࡢࡍ࡚ࡘ࠸࡚ᐇࡍࡿ㸬ヨ 㦂⤊ᚋ㸪◚ቯ࠶ࡿ࠸ࡣᮍ◚ቯࡢࢧࣥࣉࣝ⥲ᩘࡢ ᑡ࡞࠸᪉ࢆ⏝࠸࡚ᅗ㸯LL ࡛♧ࡍᖹᆒᶆ‽೫ᕪࡢ ᮇᚅ್ࢆィ⟬ࡍࡿ㸬ḟ㸪ᚓࡽࢀࡓᖹᆒ㸪ᶆ‽೫ ᕪࡢᮇᚅ್ࢆ⏝࠸࡚◚ቯ☜⋡ ࡢ್ࢆィ⟬ࡋ㸪 ࡇࢀࢆᇶᮏືᐃ᱁Ⲵ㔜 ࡍࡿ㸬 ࢧࣥࣉࣝᩘᖹᆒ㸪ᶆ‽೫ᕪࡢᮇᚅ್ ࡇࢀࡲ࡛ .$%URZQOHH ࡢ◊✲ࢆཧ⪃ ⴭ⪅➼ ࡣ㸪ࢧࣥࣉࣝᩘ Q ࡲ࡛ࡢᖹᆒ ࠾ࡼࡧᶆ‽೫ᕪࡢᮇᚅ್ࢆィ⟬ࡋ㸪ࡑࡢጇ ᙜᛶࢆ᫂ࡽࡋ࡚ࡁࡓ㸬ᙜึࢧࣥࣉࣝᩘ Q ࡣᐇ㝿⏝ពࡍࡿࡇࡀྍ⬟࡞ࢧࣥࣉࣝ ᩘヨ㦂せࡍࡿ㛫㸪ປຊࢆ຺ࡋ࡚Ỵᐃࡋ ࡚࠸ࡓࡀ㸪ᐇ㝿ࡣ㸪ḟࡢࡼ࠺࡞ሙྜ␒┠ ௨㝆ࡢヨ㦂ࢆᐇࡍࡿᚲせࡀ࠶ࡗࡓ㸬࠼ࡤȪ ᑐࡋ࡚ᐇ㝿Ⲵ㔜㝵ᕪࢆᑠࡉࡃྲྀࡗࡓሙྜࡸ➨㸯 ␒┠ࡢⲴ㔜ࡀȣࡽࡁࡃ㞳ࢀࡓሙྜ࡞࡛࠶ࡿ㸬 ࡇࡢࡼ࠺࡞ሙྜࡣ㸪ࡇࢀࡲ࡛ ␒┠௨㝆ࡶྠᵝ ࡢヨ㦂ࢆᐇࡋ㸪ᚓࡽࢀࡓ⤖ᯝࡽࢧࣥࣉࣝᩘ ᛂࡌ࡚᥎ᐃᖹᆒ㸪᥎ᐃᶆ‽೫ᕪࢆ⟬ฟࡋ㸪୍ᐃࡢ ⢭ᗘࢆᚓࡿࡲ࡛ヨ㦂ࢆ⥅⥆ࡋࡓ㸬௨ୖࡢ⤖ᯝࡽ㸪 ࡶ࠺ᑡࡋࡁ࡞ࢧࣥࣉࣝࢧࢬࡢ⢭ᗘࡘ࠸࡚ィ ⟬ࡍࡿᚲせࡀ࠶ࡿ⪃࠼㸪᪂ࡓࢧࣥࣉࣝᩘ Q ࡢࢧࣥࣉࣝࢧࢬࡘ࠸࡚ィ⟬ࢆ⾜ࡗࡓ㸬ࢫࢸ ࢣ࣮ࢫἲࡢ☜⋡ィ⟬ࡢᡭ㡰ࡣ㸪ᅗ LL ࡼࡾ㸪ᡴ ࡕษࡾᅇᩘࡲ࡛◚ቯ࠶ࡿ࠸ࡣᮍ◚ቯ࡛࠶ࡿ☜⋡ ࡀᅗ㸯L ࡢṇつศᕸࡢS
LT
Lᚑ࠺ࡍࡿ㸪Q ಶ ࡢࢧࣥࣉࣝࡀࡿ☜⋡ࡣ Q㏻ࡾ࡛࠶ࡿ㸬ᅗ㸯L ୰ ࡢ Q ࡢሙྜࡣ㸪㒊࡛㸶㏻ࡾࡢ☜⋡࡞ࡿ㸬Q ಶࡢࡍ࡚ࡢ☜⋡ࢆィ⟬ࡋࡓᚋ㸪◚ቯ࠶ࡿ࠸ࡣᮍ /RDGVWHS 3UREDELOLW\ <G <G <G <G < TTT TTS TST TTT TTS SST SST SSS 3L TL P <L <L <L Valure ofSL and TL0.00 0.04 0.08 0.12 0.16 0.20 0.0 1.0 2.0 3.0 G /V 0.5 G /V 1.5 G /V 1.0 ( ˆ PP ^` V <0 P V
i) Probability in staircase method
Fig.2 Expected value ߤƸ and ߪො with n=24 Fig.1 Estimation of ߤƸ and ߪො by staircase method
ii) Calculation procedure in the sample size
3 ࢭ࣑ࣛࢵࢡ㍈ཷࡢ㧗 ᑑ≉ᛶ㛵ࡍࡿ◊✲㸦➨ ሗ㸧 ◚ቯࡢࢧࣥࣉࣝ⥲ᩘࡢᑡ࡞࠸᪉ࡢࢧࣥࣉࣝࢆ⏝࠸ ࡚᥎ᐃᖹᆒ㸪᥎ᐃᶆ‽೫ᕪࢆồࡵࡓ㸬ᅗ㸰L 㸪LL ࡣ㸪GȪ 㸪㸪 ࡋࡓࡁࡢࢧࣥࣉࣝᩘ Q ࡢ᥎ᐃᖹᆒ㸪᥎ᐃᶆ‽೫ᕪࡢศᕸࢆ♧ࡋ࡚࠸ ࡿ㸬᥎ᐃᖹᆒࡢศᕸࡣᕥྑᑐ⛠࡛࠶ࡿࡢ࡛㸪ࡇࡇ ࡛ࡣ<ࡀȣࡽȣȪࡲ࡛ኚࡋࡓࡁࡢ᥎ᐃ ᖹᆒࡋࡓ㸬GȪ ௨ୖ࡛᥎ᐃᖹᆒࡣᴟࡵ࡚ȣ ㏆࡙ࡃࡇࡀࢃࡿ㸬᥎ᐃᶆ‽೫ᕪ࠾࠸࡚ࡶ ಶᩘࢆቑࡍࡇ࡛᥎ᐃᖹᆒྠᵝȪ㏆࡙ࡃࡇ ࡀࢃࡿ㸬Ⲵ㔜㝵ᕪࢆᑠࡉࡃྲྀࡗࡓሙྜࡢG Ȫ ࡣูࡍࢀࡤGȪ 㸪 ࡢ⠊ᅖ࡛㸪௨ ๓ࡢࢧࣥࣉࣝᩘQ ࡀ⣙Ȫ࡛࠶ࡿࡢᑐࡋ㸪 Q ࡛ࡣ Ȫࡲ࡛ྥୖࡍࡿࡇࡀࢃࡿ㸬 ヨ㦂⨨࠾ࡼࡧヨ㦂᮲௳ ヨ㦂⨨࠾ࡼࡧィ ࡢᵓᡂࢆᅗ㸱♧ࡍ㸬㍈ཷ ヨ㦂∦ࡣ㸪ᅗ୰ࡢୖᅇ㌿㍈ୗⲴ㔜㍈㛫タ⨨ࡋ ࡓ㸬Ⲵ㔜ࡣ㸪₶࠾ࡼࡧ↓₶᮲௳࡛ศࡅ࡚⪃࠼㸪 ₶࡛ࡣ࢚࣮ࢧ࣮࣎᪉ᘧ㸪↓₶࡛ࡣ㗽ࢆ⏝࠸ ࡓ㟼Ⲵ㔜᪉ᘧࡋࡓ㸬㍈ཷࢆタ⨨ࡋࡓ⅔ࡢ㍈ཷ࿘ ㎶㒊ෆቨࡣࢢࣛࣇࢺ࣮࢝࣎ࣥࢆ⏝࠸Ẽ㞺 ᅖẼ୰ Υࡋࡓ㸬ヨ㦂୰ࡢ㍈ཷࡢᣲື≉ ᛶࡣ㸪ୗⲴ㔜㍈ࡢᗏ㒊タ⨨ࡋࡓ࣮ࣟࢻࢭ ࣝ㸪 㟁ὶᘧኚࢭࣥࢧ࠾ࡼࡧࢺࣝࢡィࡢ ฟຊࢆࣃࢯࢥࣥྲྀࡾ㎸ࡳࢹ࣮ࢱฎ⌮ࢆ⾜ ࡗࡓ㸬ヨ㦂⏝࠸ࡓ㍈ཷࡢᑍἲᙧ≧࠾ࡼࡧ ᮦ㉁ࢆᅗ㸱ᅗ♧ࡍ㸬㍈ཷࡣ㸪ᕷ㈍ࡢࢫ ࣛࢫࢺ⋢㍈ཷ㸦㸧ᙧ≧࡛せ⣲㒊ရࡢᮦ ㉁ࡽ࡚ࡀ 68-㸪686& ࠾ࡼࡧ㌿ືయ 6L1࿘ື┙ 686& ࢆ⤌ྜࡏࡓ㸱✀㢮ࡋࡓ㸬 ヨ㦂᮲௳ࢆ⾲㸯♧ࡍ㸬Ẽ㞺ᅖẼ Υ࠾ࡅ ࡿ₶࡛ࡣ㸪࢘ࣞࢢ࣮ࣜࢫࢆ⏝࠸ヨ㦂㛤ጞ๓ ሸࡋࡓᚋࡣ㸪ヨ㦂୰ࡢ⿵⤥ࡣ⾜ࢃ࡞࠸ࡶࡢࡋ ࡓ㸬୍᪉㸪↓₶᮲௳࡛ࡣ㍈ཷࢆࢭࢺ࡛ࣥὙί ᚋ㸪Ẽ㞺ᅖẼ୰ Υ࡛ྠᵝࡢヨ㦂ࢆᐇࡋࡓ㸬
Ẽ㞺ᅖẼ୰ Υ࠾ࡅࡿ㍈ཷࡢ㧗
ᦶ᧿ᦶ⪖≉ᛶ
ࢢ࣮ࣜࢫ₶ࡼࡿ㍈ཷࡢᦶ᧿ᦶ⪖≉ᛶ࠾ࡼ ࡧྛせ⣲㒊ရࡢ◚ᦆ ᅗ㸲L 㸪LL ࡣ㸪6L1686& ᮦ㉁ࡢ㍈ཷࢆ⏝ ࠸࡚ヨ㦂ࢆᐇࡋࡓࡁࡢ⧞ࡾ㏉ࡋᩘᑐࡍࡿᦶ 30 30 18 9 17Thrust roll bearing of 51103
Table 1 Life test conditions
Fig.5 Failure characteristic of bearing component at atmospheric 200 degrees
Fig.4 Life judgment of the rolling ball bearing Fig.3 Life test apparatus for the high-temperature range
i) flaking of bearing race ii) flaking of rolling element
iii) abrasion of bearing race iv) failure of retainer
Rotating shaft Specimen Furnace Loading Shaft Cage Bearing race Rolling element (SUS440) (Si3N4, SUS440C)
The load shaft The rotating shaft
4 7KH%XOOHWLQRI,QVWLWXWHRI7HFKQRORJLVWV1R ᧿ಀᩘࢆ♧ࡍ㸬ᅗ㸲L ࡣ㸪ᡴࡕษࡾᅇᩘ ࡲ࡛ ᦶ᧿ಀᩘࡀᛴ⃭ኚࡋᑑ⮳ࡿ◚ቯࡢሙྜ ࡛࠶ࡿ㸬ᅗ㸲LL ࡣᡴࡕษࡾᅇᩘෆ࡛ᦶ᧿ಀᩘࡢᛴ ⃭࡞ኚࢆకࢃ࡞࠸ᮍ◚ቯࡢሙྜ࡛࠶ࡿ㸬₶ ࠾ࡅࡿᦶ᧿ಀᩘࡢኚືࡣ㸪ྠ୍ᮦ㉁ࡢ 68-㸪 686& ẚ␗✀ᮦ㉁ࡢ⤌ྜࡏ 6L1686 ࡀ ഹࡁࡃ࡞ࡿഴྥࢆ♧ࡋࡓ㸬ࡇࢀࡣ㸪㌿ືయ 6L1㌿ࡀࡾ᥋ゐࡍࡿ࿘ື┙㸪ಖᣢჾࡢᦶ⪖ᙧ ែࡀ␗࡞ࡿࡓࡵ᥎ ࡉࢀࡿ㸬㍈ཷࡢᑑࡣ㸪ࣇ ࣮ࣞ࢟ࣥࢢࡼࡿ⑂ࢀᑑᦶ⪖ࡼࡾせ⣲㒊ရ ࡀ◚ᦆ⮳ࡿᦶ⪖ᑑ༊ศ࡛ࡁࡿ㸬 ᅗ㸳L 㸪LL 㸪LLL 㸪LY ࡣ㸪686 ㍈ཷ࠾ࡅ ࡿྛせ⣲㒊ရ㸦࿘ື┙㸪㌿ືయ࠾ࡼࡧಖᣢჾ㸧 ⏕ࡌࡓ◚ቯ≧ែࡢࢆ♧ࡍ㸬ᅗ㸳L 㸪LL ࡣ㸪࿘ື ┙㸪㌿ືయ⏕ࡌࡓࣇ࣮ࣞ࢟ࣥࢢࡀ◚ቯࡢཎᅉ ࡞ࡿሙྜ㸪ᅗ㸳LLL ࡣ࿘ື┙ࡢᦶ⪖ࡀ◚ቯࡢ ཎᅉ࡞ࡿሙྜ࡛࠶ࡿ㸬ᅗ㸳LY ࡣ㌿ືయಖᣢჾ ࡀ᥋ゐࡍࡿ㒊ศࡽಖᣢჾࡀ◚ቯࡋࡓሙྜ࡛࠶ࡿ㸬 ᅗ㸳L 㸪LL 㸪LY ࡢせ⣲㒊ရ࡛ࡣ㸪◚ቯ⮳ࡿ ᦶ᧿ಀᩘࡣᛴ⃭ኚືࡍࡿ㸬ᅗ㸳LLL ࡢᦶ⪖ᑑ ࠾࠸࡚ࡶⓎ⏕ࡋࡓᦶ⪖⢊ࡣ㌿ࡀࡾせ⣲㒊ရ㛫ࡢ 㝽㛫ධࡿᅗ L ♧ࡍኚື᭤⥺࡞ࡾ㸪ᦶ᧿ ಀᩘࡣ⃭ࡋࡃኚືࡋ◚ቯ⮳ࡿ㸬ᅗ㸴L 㸪LL 㸪LLL ࡣ㸪⧞ࡾ㏉ࡋᩘ 1 ࡲ࡛◚ቯࡋࡓࢧࣥࣉࣝࢆ ᅗ㸳ᇶ࡙࠸࡚㍈ཷ㒊ရࡢ◚ቯཎᅉࢆ㸲ࡘࡢ◚ቯ ༊ศ࡛ᩚ⌮ࡋࡓࡶࡢ࡛࠶ࡿ㸬68- ᮦ㉁࡛ࡣ㸪 ࡀಖᣢჾࡢᦶ⪖ࡼࡿ◚ቯ࡛࠶ࡾ㸪6L1686& ᮦ㉁࡛ࡣ㸪ࡀ࿘ື┙ࡢᦶ⪖㸪 ࡀ㌿ືయࡢࣇ ࣮ࣞ࢟ࣥࢢ࠾ࡼࡧ ࡀಖᣢჾࡢᦶ⪖࡞ࡾ㸪 ᦶ⪖ࡼࡿ◚ቯࡀᨭ㓄ⓗ᥎ ࡉࢀࡿ㸬686& ᮦ㉁࡛ࡣ㸪6L1686& ᮦ㉁ 68- ᮦ㉁ࡢ୰ 㛫ⓗ࡞◚ቯᙧែ࡛㸪࿘ື┙ࡢᦶ⪖ࣇ࣮ࣞ࢟ࣥࢢ ࡢྜࡀ ྠ್࡞ࡾ㸪ࣇ࣮ࣞ࢟ࣥࢢࡀ ࡞ࡿ㌿ືయࡀ࡞◚ቯཎᅉ࡞ࡿ㸬 ↓₶ࡼࡿ㍈ཷࡢᦶ᧿ᦶ⪖≉ᛶ࠾ࡼࡧྛ せ⣲㒊ရࡢᦶ⪖࣭◚ᦆ ↓₶࠾ࡅࡿᦶ᧿ᦶ⪖≉ᛶࡣ㸪₶ࡢሙྜ ྠᵝ㸪㌿ືయ࿘ື┙࠾ࡼࡧಖᣢჾࡢ㌿ࡀࡾᦶ ᧿ࡼࡾⓎ⏕ࡍࡿᦶ⪖⢊ࡀ᥋ゐ㠃ᅾࡋ◚ቯ ⮳ࡿᦶ⪖ᑑ࡛࠶ࡿ㸬↓₶࡛ࡣ㸪㍈ཷࡢ⧞ࡾ㏉ ࡋᩘẚࡋ࡚ྛせ⣲㒊ရࡣᦶ⪖ࡍࡿ㸬Ⓨ⏕ࡋࡓ ᦶ⪖⢊ࡣ㸪㌿ࡀࡾ㠃ᅾࡋ࡞ࡅࢀࡤ┤᥋ࡢ◚ቯ ཎᅉࡣ࡞ࡽ࡞࠸ࡀ㸪ᦶ⪖⢊ࡀ㌿ࡀࡾ㠃࠶ࡿ せ⣲㛫࡛ᦶ᧿ಀᩘࡢᛴ⃭࡞ኚືࢆ⏕ࡌ◚ቯ⮳ࡿ㸬 ↓₶ࡼࡿᑑࡢุᐃࡶᅗ㸲L 㸪LL ྠᵝᦶ ᧿ಀᩘࡢኚືࡼࡾุᐃࡍࡿࡇࡀ࡛ࡁࡿ㸬
㧗 ᇦ࠾ࡅࡿྛᮦ㉁㍈ཷࡢᑑ
ࢢ࣮ࣜࢫ₶ࡼࡿሙྜ ᅗ 㸪ᅗ ࠾ࡼࡧᅗ ࡣ㸪68-㸪686&㸪 6L1686& ᮦ㉁ࡘ࠸࡚ࢫࢸࢣ࣮ࢫἲࢆᐇ ࡋࡓࡁࡢࢳ࣮ࣕࢺࢆ♧ࡍ㸬6L1686&㸪 686& ࡢヨ㦂᮲௳ࡣ㸪➨㸯␒┠ࡢⲴ㔜< N1㸪 Ⲵ㔜㝵ᕪG N1 ࡋ㸪ࢧࣥࣉࣝᩘࡣ 686& ࡀ ಶ㸪6L1686& ࡀ ಶࡋࡓ㸬68- ࡛ࡣ ➨㸯␒┠ࡢⲴ㔜<㸻N1㸪Ⲵ㔜㝵ᕪG N1 ࠾Fig.6 Failure mode of the component in the rolling ball bearings
Fig.7 Staircase chart for steel bearings(SUJ-2) at atmospheric 200 degrees
: flaking of the rolling element : flaking of the bearing race : abrasion of the retainer
: abrasion of the bearing race
8.0%
92%
i) SUJ-2 ii) SUS440C iii) Si N 3 4 /SUS440C 21%
21% 7%
50% 29%
21% 50%
Number of load cycles N=106
5 ࢭ࣑ࣛࢵࢡ㍈ཷࡢ㧗 ᑑ≉ᛶ㛵ࡍࡿ◊✲㸦➨ ሗ㸧 ࡼࡧࢧࣥࣉࣝᩘ ಶࡋ㸪ࡑࢀࡒࢀࡢヨ㦂ࢆᐇ ࡋࡓ㸬࠼ࡤ㸪6L1ᮦ㉁ࡢሙྜ࡛ㄝ᫂ࡍࡿヨ㦂 ⤖ᯝࡽ㸪◚ቯ ಶ㸪ᮍ◚ቯ ಶ࡛࠶ࡗࡓࡢ࡛㸪 ᑡ࡞࠸ಶᩘ࡛࠶ࡿᮍ◚ቯࡢࢹ࣮ࢱࢆ⏝࠸࡚㸪ࡲࡎ ᥎ᐃᖹᆒ࠾ࡼࡧ᥎ᐃᶆ‽೫ᕪࢆィ⟬ࡋ㸪ḟࡇࡢ ್ࢆ⏝࠸࡚ᇶᮏືᐃ᱁Ⲵ㔜ࢆồࡵࡓ㸬ࡑࢀࡒࢀࡢ ㍈ཷࡘ࠸࡚ᚓࡽࢀࡓ⤖ᯝࢆ⾲㸰♧ࡍ㸬ᇶᮏື ᐃ᱁Ⲵ㔜ࢆẚ㍑ࡍࡿ 68-㸼6L1686&㸼 686& ࡢ㡰࡞ࡿ㸬6L1686& ࡢࡼ࠺࡞␗✀ ᮦᩱࡢ⤌ࡳྜࢃࡏ࡛ࡣ᥎ᐃᶆ‽೫ᕪࡣࡁࡃ࡞ࡿ ഴྥࢆ♧ࡍ㸬ᚓࡽࢀࡓ⤖ᯝࡽ GȪࢆồࡵࡿ 6L1686& ࡛GȪ 㸪686& ࡛ GȪ ࠾ࡼࡧ 68- ࡛ࡣGȪ ࡞ࡾ㸪ᅗ㸰࠾ࡅ ࡿGȪ 㹼 ࡢ⠊ᅖࡢᮇᚅ್ࢆࡿࡇࡀࢃ ࡿ㸬68- ᮦ㉁ࡢᇶᮏືᐃ᱁Ⲵ㔜ࢆ㸯ࡍࡿ Ẽ㞺ᅖẼ Υࡢ್ࡣ 686& ᮦ㉁࡛ 㸪 6L1686& ᮦ㉁࡛ ῶᑡࡍࡿ㸬 ↓₶ࡼࡿሙྜ 㧗 㸪↓₶࡛ࡣ㸪ࢫࢸࢣ࣮ࢫἲࢆᐇࡍࡿ ࠶ࡓࡾཧ⪃࡞ࡿⲴ㔜ࢹ࣮ࢱࡀ↓࠸ࡢ࡛㸪᪂ࡓ ಶࡢࢧࣥࣉࣝࢆ⏝ពࡋ࡚➨㸯␒┠ࡢⲴ㔜 <㸪G ࢆồࡵࡿ᪉ἲࢆ᳨ウࡋࡓ㸬୍⯡㸪⤫ィⓗ࡞⑂ປ ヨ㦂ࡢಙ㢗ᛶࡣ㸪ከᩘࡢヨ㦂∦ࢆ⏝ពࡋ 61 ᭤⥺ ࢆồࡵ࡞ࡅࢀࡤ࡞ࡽ࡞࠸ࡀ㸪ഴᩳ㒊ࡢࡳ࡛࠶ࢀࡤ 61 ヨ㦂ἲ ࡢഴᩳ㒊ࡀ⏝࡛ࡁࡿ㸬ࢫࢸࢣ ࣮ࢫἲࡢ➨㸯␒┠ࡢⲴ㔜 < ࢆ࡛ࡁࡿࡔࡅȣࡢ㏆ ࡃ㑅ࡪࡓࡵ㸪ഴᩳ㒊ࡢ┤⥺ᛶࡢ᳨ᐃࢆ⏝࠸ࡿ㸬 ࡇࢀࡲ࡛ഴᩳ㒊࡛ࡣ㸪∦ᑐᩘᗙᶆୖ࡛┤ ⥺ࡋࡓࡀ࠸㸪ࡘ⧞ࡾ㏉ࡋᩘ 1 ࡢᑐᩘṇ つศᕸ࡛ࡣ ORJ1 ࡢศᩓȪࡣⲴ㔜ẁ㝵ࡣ ౫Ꮡࡋ࡞࠸㸬ྠᵝⲴ㔜ࡢṇつศᕸ࡛ࡶⲴ㔜ࡢ ศᩓȪࡣ⧞ࡾ㏉ࡋᩘ 1 ౫Ꮡࡋ࡞࠸ࡇࡀᐇ 㦂ⓗ▱ࡽࢀ࡚࠸ࡿ㸬ࡑࡇ࡛㸪ᡴࡕษࡾᅇᩘ ࡲ࡛࡞ࡽࡎ◚ቯࡀண ࡉࢀࡿⲴ㔜⠊ᅖࢆ➼ 㛫㝸௵ពࡢ ẁ㝵ศࡅ㸪ྛⲴ㔜ẁ㝵࡛ࡑࢀ ࡒࢀ ಶࡢヨ㦂ࢆᐇࡋ◚ቯ⮳ࡿࡲ࡛ࡢ⧞ࡾ㏉ ࡋᩘ 1 ࢆồࡵࡿ㸬ᅗ ࡣ 6L1686& ᮦ㉁ࢆ⏝ ࠸ࡓഴᩳ㒊ࡢ⤖ᯝࢆ♧ࡋ࡚࠸ࡿ㸬ഴᩳ㒊ࡢ㏆ఝ┤ ⥺ࡽ⧞ࡾ㏉ࡋᩘ 1 ࢆ࠼ࡿⲴ㔜ࢆồࡵ㸪ࡇ ࢀࢆࢫࢸࢣ࣮ࢫἲ࠾ࡅࡿ➨㸯␒┠ࡢⲴ㔜 < ࡋ㸪ࡇࡢࡁࡢᶆ‽೫ᕪȪࢆⲴ㔜㝵ᕪG ࡋࡓ㸬 ᅗ ࠾ࡼࡧᅗ ࡣ㸪㧗 㸪↓₶࡛ࢫࢸࢣ࣮ ࢫἲࢆᐇࡋࡓࡁࡢࢳ࣮ࣕࢺࢆ♧ࡋ࡚࠸ࡿ㸬ヨ 㦂᮲௳ࡣ㸪ᅗ ࡢ᪉ἲࢆ⏝࠸ 6L1686& ᮦ㉁ ࡛ࡣ㸪➨㸯␒┠ࡢⲴ㔜 < 1㸪Ⲵ㔜㝵ᕪ G 1 ࠾ ࡼࡧࢧࣥࣉࣝᩘ Q ࡋ㸪686& ᮦ㉁࡛ࡣ㸪➨ Mean life load Standard deviation 95 % confidence limits for
Expected level for 90 % life load F50 F10 Lower Upper 1.898 Materials Si3N4 /SUS440C Unit : kN SUS440C /SUS440C 1.777 2.118 SUJ-2 / SUJ-2 F50 2.289 0.305 2.100 2.478 2.100 0.252 1.987 2.213 2.359 0.189 2.263 2.455
{
No. Thrust load (N) Number of cycles 1 2 3 4 5 6 7 8 66 66 59 59 52 52 45 45 39.12×10 48.02 59.00 46.12 65.26 79.22 97.64 81.04 4
Fig.8 Staircase chart for stainless bearings(SUS440C) at atmospheric 200 degrees
Fig.9 Staircase chart for ceramic bearings(Si3N4/SUS440C) at atmospheric 200 degrees
Table 2 The basic load rating at atmospheric 200 degrees
Fig. 10 SN curve (a high load portion) of the wear life by the 14-SN test method
Results of 14S-N testing method
6 7KH%XOOHWLQRI,QVWLWXWHRI7HFKQRORJLVWV1R 㸯␒┠ࡢⲴ㔜 < 1㸪Ⲵ㔜㝵ᕪ G 1 ࠾ࡼࡧࢧࣥ ࣉࣝᩘ Q ࡋ࡚ヨ㦂ࢆᐇࡋࡓ㸬ヨ㦂⤖ᯝࡽ㸪 6L1686& ᮦ㉁࡛ࡣ◚ቯ ಶ㸪ᮍ◚ቯ ಶ㸪 686& ᮦ㉁࡛ࡣ◚ቯ ಶ㸪ᮍ◚ቯ ಶࡼࡾ㸪 ࡑࢀࡒࢀᑡ࡞࠸᪉ࡢࢹ࣮ࢱࢆ⏝࠸࡚ィ⟬ࡋࡓ⤖ᯝ ࢆ⾲ ♧ࡍ㸬ᇶᮏືᐃ᱁Ⲵ㔜ࢆẚ㍑ࡍࡿ㸪ࡑ ࡢࡁࡉࡣ 6L1686&㸼686& ࡞ࡾ㸪6L1 ㌿ືయࡢ᭷ពᕪࡀㄆࡵࡽࢀࡿ㸬ᚓࡽࢀࡓ⤖ᯝࢆࡶ GȪࢆồࡵࡿ㸪6L1686& ᮦ㉁࡛ࡣG Ȫ 㸪686& ᮦ㉁࡛ࡣ ࡞ࡾ㸪ࡑࡢ⢭ ᗘࡣᅗ㸰୰ࡢࡰ GȪ ㏆ഐ࠶ࡿࡇࡀࢃ ࡿ㸬Υ㸪↓₶࡛ࡣ㸪6L1686& ᮦ㉁ 686& ᮦ㉁ࢆẚ㍑ࡋࡓሙྜ 686& ᮦ㉁ᑐࡋ 6L1686& ᮦ㉁ࡣ ಸࡢᇶᮏືᐃ᱁Ⲵ㔜 ࡞ࡿ㸬
ࡲࡵ
6L1686&㸪686& ࠾ࡼࡧ 68- ᮦ㉁ࡢ㍈ ཷࢆ⏝࠸࡚㧗 ᦶ᧿ᦶ⪖≉ᛶࢆㄪࡿࡶࢫ ࢸࢣ࣮ࢫἲࡼࡿ㧗 ᑑ≉ᛶࢆホ౯ࡋ㸪௨ୗ ࡢ⤖ᯝࢆᚓࡓ㸬 Ẽ୰ Υ㸪₶࠾ࡅࡿᑑ⮳ࡿ࡞◚ ቯཎᅉࡣ㸪68- ᮦ㉁ࡢ ࠾ࡼࡧ 6L1686& ᮦ㉁ࡢ ࡀ࿘ື┙ࡢᦶ⪖࡛࠶ࡿ㸬686& ᮦ㉁ ࡛ࡣ㸪ࡀ㌿ືయࡢࣇ࣮ࣞ࢟ࣥࢢ࡛࠶ࡿ㸬 Ẽ୰ Υ㸪↓₶࠾ࡅࡿᦶ᧿ᦶ⪖≉ᛶࡣ㸪 686&㸪6L1686& ࡢᮦ㉁ࡶ◚ቯ⮳ࡿ ཎᅉࡣᦶ⪖࡛࠶ࡿ㸬 ᇶᮏືᐃ᱁Ⲵ㔜ࡣ㸪Υ㸪₶࡛ 68- ᮦ㉁ ࡀ᭱ࡶࡁࡃ㸪Υ↓₶࡛ࡣ㸪686& ᮦ ㉁ẚ࡚ 6L1686& ᮦ㉁ࡢᇶᮏືᐃ᱁Ⲵ 㔜ࡣ㸪㧗 ≉ᛶඃࢀ࡚࠸ࡿ㸬ᩥ ⊩
1) ᕷᕝⱱᶞ㸪ࢪࣗࣁࣝࢺࣀ㸪ᑠዉ ᘯ㸪ྜྷᮏ ຬ㸸ࢫࢸ ࢣ࣮ࢫἲࢆ⏝࠸ࡓ㌿ࡀࡾ㍈ཷࡢᑑヨ㦂㸪᪥ᮏᶵᲔ Ꮫㄽᩥ㞟(㹁⦅),62,595,(1996)1033.2) ISO281 Rolling bearings-Dynamic load rating life,(1990). 3) JIS B1518:㌿ࡀࡾ㍈ཷࡢືᐃ᱁Ⲵ㔜ཬࡧᐃ᱁ᑑࡢィ
⟬᪉ἲ,(1992).
4) K.A.Brownlee,J.L. Hodges and M. Rosenblatt:J.Amer.Stat. Assn.,8(1953),262. 5) ᕷᕝⱱᶞ㸪ࢪࣗࣁࣝࢺࣀ㸪ᑠዉ ᘯ㸪ྜྷᮏ ຬ㸸ࢫࢸ ࢣ࣮ࢫἲࡼࡿࢭ࣑ࣛࢵࢡ⋢㍈ཷࡢᑑヨ㦂㸪⢭ᐦ ᕤᏛㄅ,61,12㸦1995㸧1740. 6) JSME S2002:⤫ィⓗ⑂ປヨ㦂᪉ἲ(ᨵゞ∧),᪥ᮏᶵᲔᏛ (1994). 7) ᕷᕝⱱᶞ㸪ᑠዉ ᘯ㸸㧗 ࠾ࡅࡿࢭ࣑ࣛࢵࢡ㍈ཷࡢ ᑑヨ㦂㸪2001 ᖺ⢭ᐦᮇㅮ₇㸪pp393,2001. 8) ᕷᕝⱱᶞ:㧗 㸪↓₶࠾ࡅࡿࢭ࣑ࣛࢵࢡ㍈ཷࡢᑑ ヨ㦂㸪2003 ᖺ⢭ᐦᮇㅮ₇㸪M79,2003.
Fig. 11 Staircase chart for ceramic bearings(Si3N4/SUS440C) in unlubricating at atmospheric 200 degrees
Fig. 12 Staircase chart for stainless bearings(SUS440C) in unlubricating at atmospheric 200 degrees
Table 3 The basic load rating in unlubricating at atmospheric 200 degrees
Mean life load Standard deviation 95 % confidence limits for
