JPH05164132A - Ceramic roller and manufacture thereof - Google Patents
Ceramic roller and manufacture thereofInfo
- Publication number
- JPH05164132A JPH05164132A JP35459891A JP35459891A JPH05164132A JP H05164132 A JPH05164132 A JP H05164132A JP 35459891 A JP35459891 A JP 35459891A JP 35459891 A JP35459891 A JP 35459891A JP H05164132 A JPH05164132 A JP H05164132A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- ceramic
- sintering
- sintered
- chamfered portion
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 abstract description 42
- 239000000314 lubricant Substances 0.000 description 9
- 238000000465 moulding Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 239000012467 final product Substances 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- -1 ALN Chemical class 0.000 description 1
- 241001331845 Equus asinus x caballus Species 0.000 description 1
- 229910007933 Si-M Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910008318 Si—M Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、軸受用ころとしてセ
ラミックスで製作されたころ及びそのころの製造方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller made of ceramics as a bearing roller and a method for manufacturing the roller.
【０００２】[0002]
【従来の技術】炭化けい素（SiC)や窒化けい素(Si3N4)
等のファインセラミックスは高温・高強度材料として機
械部品の材料としても採用されるようになっている。こ
のファインセラミックスによる製品は図３に示すような
工程により製造される。即ち、人工的合成により製造さ
れた原料（例えばSiC 、Si3N4 等）を調合粉砕し、これ
を一定の顆粒状（造粒化）とした後、金型成形かラバ−
プレスか射出成形等（成形化）を行い、所定の形状に機
械加工（一次加工）した後、焼成（焼結）し、これを更
に加圧焼結法（熱間静水圧加圧法いわゆるＨＩＰ法か、
熱間加圧法いわゆるＨＰ法）によって焼結した焼結体を
素材の段階で各種の非破壊検査を行い合格した素材に対
してダイヤモンド砥石による研削加工（二次加工）を施
し、例えば最終製品たる軸受用ころとするのである。
尚、軸受の使用条件によっては、加圧焼結法を採用しな
い場合もある。2. Description of the Related Art Silicon carbide (SiC) and silicon nitride (Si 3 N 4 )
Fine ceramics, etc., have been adopted as materials for machine parts as high temperature and high strength materials. A product made of this fine ceramics is manufactured by the process shown in FIG. That is, after the raw material produced by artificial synthesis (e.g. SiC, Si 3 N 4, etc.) formulated pulverized, which was used as a fixed granular (granulation), molding or mule -
After press or injection molding (molding), mechanical processing (primary processing) to a predetermined shape, firing (sintering), and further pressure sintering method (hot isostatic pressing method so-called HIP method) Or
A non-destructive inspection is performed at the material stage of a sintered body that has been sintered by a hot pressing method (so-called HP method), and a material that has passed the test is subjected to grinding processing (secondary processing) with a diamond grindstone, for example, a final product. It is a bearing roller.
The pressure sintering method may not be adopted depending on the usage conditions of the bearing.
【０００３】[0003]
【考案が解決しようとする課題】全ての構成部品にセラ
ミックス製品を用いた総セラミックス軸受或いは一部に
セラミックス製品を用いた組合せセラミックス軸受の転
動体がセラミックス円筒ころ或いはセラミックス針状こ
ろである場合、これらセラミックス円筒ころやセラミッ
クス針状ころの面取り部を焼結（即ち、加圧焼結法や常
圧焼結法による焼結）後ダイヤモンド砥石により研削加
工すると多大のコストアップとなり、また使用時の潤滑
剤の長期保持が難しいという問題がある。この発明はか
かる課題を解決するためになされたものであり、その目
的とする所は研削加工するに際しそのコスト低減を図る
と共に潤滑性も良くしたセラミックス製ころ及びその製
造方法を提供することにある。When the rolling elements of the all-ceramics bearing using the ceramic products for all the constituent parts or the combined ceramic bearing using the ceramic products for some parts are the ceramic cylindrical rollers or the ceramic needle rollers, If the chamfered parts of these ceramic cylindrical rollers and ceramic needle rollers are sintered (that is, sintered by the pressure sintering method or the atmospheric pressure sintering method) and then ground with a diamond grindstone, the cost will be greatly increased. There is a problem that it is difficult to retain the lubricant for a long period of time. The present invention has been made to solve the above problems, and an object of the present invention is to provide a ceramic roller which reduces cost in grinding and has good lubricity and a manufacturing method thereof. .
【０００４】[0004]
【課題を解決するための手段】即ち、この発明は上記す
る課題を解決するために、セラミックス製ころが、焼
結加工により製造したセラミックス製ころの転動面と端
面とを研削加工すると共に面取り部を未研削とし、該面
取り部に残した未研削焼結面を前記転動面及び端面の粗
さよりも粗くしたことを特徴とする。或いはセラミッ
クス製ころの製造方法が、セラミックス粉末成形体を円
柱状で且つ角部に面取り部を形成するように加工するこ
ろ素材加工工程と、該ころ素材を焼結する焼結工程と、
該焼結ころ素材の転動面と端面とを研削加工すると共に
前記面取り部に焼結面を残して成る研削加工工程と、を
含むことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above problems, according to the present invention, a ceramic roller is chamfered by grinding the rolling surface and the end surface of the ceramic roller manufactured by sintering. The portion is not ground, and the unground sintered surface left in the chamfered portion is made rougher than the roughness of the rolling surface and the end surface. Alternatively, a method of manufacturing a ceramic roller comprises a roller material processing step of processing a ceramic powder compact so as to form a chamfered portion in a columnar shape, and a sintering step of sintering the roller material,
And a grinding step of grinding the rolling surface and the end surface of the sintered roller material and leaving the sintered surface in the chamfered portion.
【０００５】[0005]
【作用】この発明にかかるセラミックス製ころを上記手
段により製造すると、該ころは未加工の状態で残される
面取り部は表面が粗い状態であるため潤滑剤が保持され
やすくなる。このように面取り部に潤滑剤が保持される
ようになると潤滑条件が悪くなった時この面取り部は潤
滑剤の供給源としての機能を果たす。また、この発明に
かかるセラミックス製の軸受用ころの製造方法を上記手
段とすれば、最も加工に要する時間と手間のかかる面取
り部の研削加工を省略することが出来るのでコスト低減
を図ることが出来る。When the ceramic roller according to the present invention is manufactured by the above-mentioned means, the chamfered portion left in an unprocessed state of the roller has a rough surface, so that the lubricant is easily retained. When the lubricant is retained in the chamfered portion in this way, the chamfered portion functions as a supply source of the lubricant when the lubrication conditions deteriorate. Further, if the method for manufacturing a ceramic bearing roller according to the present invention is used as the above means, it is possible to omit the grinding process of the chamfered part, which requires the most processing time and labor, so that the cost can be reduced. .
【０００６】[0006]
【実施例】以下、この発明の具体的実施例について図面
を参照して説明する。図１はこの発明にかかるセラミッ
クス製ころを軸受に配置した状態の一部断面図、図２は
該セラミックス製ころの一部拡大図である。この実施例
でのころは円筒ころ３とし軸受の外輪１と内輪２との間
に配置されている（保持器は省略）。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a ceramic roller according to the present invention arranged in a bearing, and FIG. 2 is a partially enlarged view of the ceramic roller. In this embodiment, the rollers are cylindrical rollers 3 and are arranged between the outer ring 1 and the inner ring 2 of the bearing (the cage is omitted).
【０００７】前記円筒ころ３は次のような工程により製
造する。先ず、素材加工工程においては、原料粉末を顆
粒状とした後成形加工する。原料粉末としてはSi3N4 や
ALN やBNやTiN 等の窒化物、SiC やB4C やWCやTiC 等の
炭化物、或いはSi4-Z Alz O Z N3-ZやSi-M* -O-N（M
* :Be 、Li、Mg）等の酸窒化物、更にはAl2O3 やZrO2-
Y2O3 やAl2O3-ZrO2等の酸化物が用いられる。次に、成
形加工後円筒ころ３となる素材として機械加工（一次加
工）で予めほぼ最終製品の形である円柱状で且つ角部に
所定のｒの面取り部が形成されるように加工する。尚、
成形法としては加圧成形、静水圧成形、押し出し成形、
射出成形、泥漿鋳込み成形等がありいずれの方法でも可
能である。The cylindrical roller 3 is manufactured by the following steps. First, in the material processing step, the raw material powder is made into granules and then molded. As raw material powder, Si 3 N 4
Nitride such as ALN, BN and TiN, carbide such as SiC, B 4 C, WC and TiC, or Si 4-Z Al z O Z N 3-Z and Si-M * -ON (M
* : Be, Li, Mg) and other oxynitrides, as well as Al 2 O 3 and ZrO 2-
Oxides such as Y 2 O 3 and Al 2 O 3 -ZrO 2 are used. Next, as a material to be the cylindrical roller 3 after the forming process, it is machined (primary process) in advance so that a chamfered portion having a predetermined r is formed in a columnar shape which is substantially the shape of the final product. still,
Molding methods include pressure molding, hydrostatic molding, extrusion molding,
There are injection molding, slurry casting and the like, and any method is possible.
【０００８】上記するようにして成形、機械加工されほ
ぼ最終製品の形である角部に面取り部を形成された円柱
状の素材を焼結工程、即ち、焼成及び加圧焼結法或いは
常圧焼結法による焼結工程で焼結を行う。加圧焼結法に
は、ＨＰ法（Hot pres法）と、ＨＩＰ法（Hot isostati
c pressprocess 法）とがある。ＨＰ法は、焼結助剤を
添加した原料粉末を型の中に入れ、加熱しながらプレス
により一軸方向の圧力を加えて焼結する方法であり焼結
温度も低くてよい。またＨＩＰ法は、焼結温度で軟化す
るガラス等の容器中に焼結助剤を添加した原料粉末を入
れて、その外部から高圧流体で加圧して焼結するカプセ
ル法と、粉末成形体を残留気孔が閉気孔となるまで予備
的に焼結しておき、次いで高圧ガス中で焼結する無カプ
セル法とがある。この発明にかかる円筒ころ３はいずれ
の方法も可能である。常圧焼結法は常圧又は減圧ガス雰
囲気中で焼結する方法であって複雑な形状の製品を量産
するのに適している。こうして焼結工程を経た角部に面
取り部を形成した円柱状素材を研削加工して円筒ころ３
とするのであるが、この場合図２にも示すように面取り
部３ｃは研削せずに残すように研削加工する。A cylindrical material having the chamfered portions formed at the corners, which is the shape of the final product, is formed and machined as described above, and is subjected to a sintering step, that is, a firing and pressure sintering method or normal pressure. Sintering is performed in the sintering process by the sintering method. The pressure sintering method includes HP method (Hot pres method) and HIP method (Hot isostati method).
c pressprocess method). The HP method is a method in which a raw material powder to which a sintering aid is added is put into a mold and pressure is applied in a uniaxial direction by pressing while heating, and the sintering temperature may be low. The HIP method includes a capsule method in which a raw material powder added with a sintering aid is put in a container such as glass that softens at the sintering temperature, and the powder is pressed by a high-pressure fluid from outside to sinter, and a powder compact. There is a non-capsule method in which pre-sintering is performed until residual pores become closed pores, and then sintering is performed in high-pressure gas. Any method can be used for the cylindrical roller 3 according to the present invention. The normal pressure sintering method is a method of sintering in a normal pressure or reduced pressure gas atmosphere, and is suitable for mass-producing products having complicated shapes. In this way, the cylindrical material having chamfered portions formed at the corners that have undergone the sintering process is ground to form cylindrical rollers 3
In this case, as shown in FIG. 2, the chamfered portion 3c is ground so as to remain without being ground.
【０００９】前記円筒ころ３は、加圧焼結法や常圧焼結
法による焼結後ダイヤモンド砥石により研削加工する
が、被加工円筒ころ３は相当硬くダイヤモンド砥石でも
相当の時間と労力を要する。そこで図２及び図３に示す
ように、転動面３ａと端面３ｂのみ研削代ｔの研削加工
を行い、面取り部３ｃは未加工の状態とする。従って面
取り部３ｃはＣ１及びＣ２部分が焼結された状態のまま
未加工（未研削）で残され、所定の寸法と表面粗さで加
工されることになる。通常、転動面３ａと端面３ｂの表
面粗さは０．２〜０．６Ｚである。尚、図３は説明上見
かけの研削代ｔを大きくしてあるが、実際は僅かの研削
代しかない。従って、この未加工状態の面取り部３ｃが
内外輪や保持器の表面と接触することはない。The cylindrical roller 3 is ground by a diamond grindstone after being sintered by a pressure sintering method or an atmospheric pressure sintering method. The cylindrical roller 3 to be processed is considerably hard and requires a considerable amount of time and labor even with a diamond grindstone. . Therefore, as shown in FIGS. 2 and 3, only the rolling surface 3a and the end surface 3b are ground to the grinding allowance t, and the chamfered portion 3c is left unmachined. Therefore, the chamfered portion 3c is left unprocessed (unground) in the state where the C1 and C2 portions are sintered, and is processed with a predetermined dimension and surface roughness. Usually, the surface roughness of the rolling surface 3a and the end surface 3b is 0.2 to 0.6Z. Although the apparent grinding allowance t is increased in FIG. 3 for the sake of explanation, in reality, there is only a slight grinding allowance. Therefore, the chamfered portion 3c in the unprocessed state does not come into contact with the surfaces of the inner and outer races and the cage.
【００１０】この発明にかかるセラミックス製の軸受用
ころを上記構成とすれば、最も加工に要する時間と手間
のかかる面取り部の研削加工を省略することが出来るの
で製造コストを低減することが出来る。また、未加工の
状態で残される面取り部は表面が、研削加工された転動
面３ａや端面３ｂの数倍〜数十倍というような粗い状態
であるため潤滑剤が保持されやすい。このように面取り
部に潤滑剤が保持されるようになると潤滑条件が悪くな
った時この面取り部は潤滑剤の供給源としての機能を果
たすことになる。尚、この実施例では円筒ころや針状こ
ろで説明したが、円錐ころでも実施可能である。When the ceramic bearing roller according to the present invention has the above-mentioned structure, the grinding process for the chamfered portion, which requires the most processing time and labor, can be omitted, so that the manufacturing cost can be reduced. Further, the chamfered portion left in the unprocessed state has a rough surface such as several times to several tens of times that of the ground rolling surface 3a and the end surface 3b, so that the lubricant is easily retained. When the lubricant is retained in the chamfered portion in this way, the chamfered portion functions as a supply source of the lubricant when the lubrication conditions deteriorate. In this embodiment, cylindrical rollers and needle rollers have been described, but tapered rollers can also be used.
【００１１】[0011]
【発明の効果】この発明にかかるセラミックス製ころ及
びその製造方法は以上詳述したような構成としたので、
軸受用として用いれるセラミックス製の円筒ころや針状
ころの製作コストを大幅に低減することが出来る。この
発明にかかるセラミックス製ころの面取り部は内・外輪
や保持器と接触することはないので焼結変質層が存在し
ていても傷が付くことはなく軸受としての寿命に影響を
与えることはない。また、面取り部は潤滑剤の保持機能
を有することになるのでここが潤滑剤供給源となり円筒
ころや針状ころき軌道面（内・外輪）や保持器との間の
潤滑に効果が大となる。Since the ceramic roller and the method for manufacturing the same according to the present invention are configured as described above in detail,
It is possible to significantly reduce the manufacturing cost of ceramic cylindrical rollers and needle rollers used for bearings. The chamfered portion of the ceramic roller according to the present invention does not come into contact with the inner / outer rings or the cage, so that even if the sintered alteration layer is present, the chamfered portion is not scratched and the life of the bearing is not affected. Absent. In addition, since the chamfered part has a lubricant retaining function, this serves as a lubricant supply source and has a great effect on lubrication between the cylindrical rollers and needle roller raceways (inner / outer rings) and the cage. Become.
【図１】この発明にかかるセラミックス製ころを軸受に
配置した状態の一部断面図である。FIG. 1 is a partial cross-sectional view showing a state in which a ceramic roller according to the present invention is arranged in a bearing.
【図２】この発明にかかるセラミックス製ころの一部拡
大図である。FIG. 2 is a partially enlarged view of a ceramic roller according to the present invention.
【図３】ファインセラミックスによる製品の製造工程を
示す概念図である。FIG. 3 is a conceptual diagram showing a manufacturing process of a product made of fine ceramics.
１ 軸受外輪 ２ 軸受内輪 ３ 円筒ころ ３ａ 転動面 ３
ｂ 端面 ３ｃ 面取り部1 Bearing outer ring 2 Bearing inner ring 3 Cylindrical roller 3a Rolling surface 3
b End face 3c Chamfer
Claims (2)
ころの転動面と端面とを研削加工すると共に面取り部を
未研削とし、該面取り部に残した未研削焼結面を前記転
動面及び端面の粗さよりも粗くしたことを特徴としたセ
ラミックス製ころ。1. A ceramic roller manufactured by sintering is ground to a rolling surface and an end surface, and a chamfered portion is made unground, and an unground sintered surface left in the chamfered portion is used as the rolling surface and Ceramic rollers characterized by being rougher than the end faces.
角部に面取り部を形成するように加工するころ素材加工
工程と、該ころ素材を焼結する焼結工程と、該焼結ころ
素材の転動面と端面とを研削加工すると共に前記面取り
部に焼結面を残して成る研削加工工程と、を含むセラミ
ックス製ころの製造方法。2. A roller material processing step of processing a ceramic powder compact so as to form a chamfered portion in a columnar shape, a sintering step of sintering the roller material, and a sintered roller material And a grinding step of grinding the rolling surface and the end surface and leaving a sintered surface in the chamfered portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3354598A JP2984127B2 (en) | 1991-12-18 | 1991-12-18 | Ceramic roller and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3354598A JP2984127B2 (en) | 1991-12-18 | 1991-12-18 | Ceramic roller and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05164132A true JPH05164132A (en) | 1993-06-29 |
| JP2984127B2 JP2984127B2 (en) | 1999-11-29 |
Family
ID=18438641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3354598A Expired - Lifetime JP2984127B2 (en) | 1991-12-18 | 1991-12-18 | Ceramic roller and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2984127B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004016285A1 (en) * | 2004-04-02 | 2005-10-20 | Fag Kugelfischer Ag | Ceramic rolling element for a roller bearing and method for its production |
| US7261425B2 (en) | 1999-04-07 | 2007-08-28 | 3M Innovative Properties Company | Structured surface articles containing geometric structures with compound faces and methods for making same |
| US8394485B2 (en) | 2000-02-25 | 2013-03-12 | 3M Innovative Properties Company | Compound mold and structured surface articles containing geometric structures with compound faces and method of making same |
| JP2016196883A (en) * | 2015-04-06 | 2016-11-24 | ゼネラル・エレクトリック・カンパニイ | Fan bearings for turbine engine |
| US9869190B2 (en) | 2014-05-30 | 2018-01-16 | General Electric Company | Variable-pitch rotor with remote counterweights |
| US10072510B2 (en) | 2014-11-21 | 2018-09-11 | General Electric Company | Variable pitch fan for gas turbine engine and method of assembling the same |
| US10100653B2 (en) | 2015-10-08 | 2018-10-16 | General Electric Company | Variable pitch fan blade retention system |
| CN114454066A (en) * | 2021-10-21 | 2022-05-10 | 北京机科国创轻量化科学研究院有限公司 | Grinding equipment for removing attachments on surface of ceramic roller |
| US11674435B2 (en) | 2021-06-29 | 2023-06-13 | General Electric Company | Levered counterweight feathering system |
| US11795964B2 (en) | 2021-07-16 | 2023-10-24 | General Electric Company | Levered counterweight feathering system |
| EP4667762A1 (en) * | 2024-06-20 | 2025-12-24 | NTN Corporation | Roller and roller bearing |
-
1991
- 1991-12-18 JP JP3354598A patent/JP2984127B2/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8485672B2 (en) | 1999-04-07 | 2013-07-16 | 3M Innovative Properties Company | Structured surface articles containing geometric structures with compound faces and methods for making same |
| US7261425B2 (en) | 1999-04-07 | 2007-08-28 | 3M Innovative Properties Company | Structured surface articles containing geometric structures with compound faces and methods for making same |
| US7384161B2 (en) | 1999-04-07 | 2008-06-10 | 3M Innovative Properties Company | Structured surface articles containing geometric structures with compound faces and methods for making same |
| US7562991B2 (en) | 1999-04-07 | 2009-07-21 | 3M Innovative Properties Company | Structured surface articles containing geometric structures with compound faces and methods for making same |
| US7712904B2 (en) | 1999-04-07 | 2010-05-11 | 3M Innovative Properties Company | Structured surface articles containing geometric structures with compound faces and methods for making same |
| US8852722B2 (en) | 2000-02-25 | 2014-10-07 | 3M Innovative Properties Company | Compound mold and structured surface articles containing geometric structures with compound faces and method of making same |
| US8394485B2 (en) | 2000-02-25 | 2013-03-12 | 3M Innovative Properties Company | Compound mold and structured surface articles containing geometric structures with compound faces and method of making same |
| US8728610B2 (en) | 2000-02-25 | 2014-05-20 | 3M Innovative Properties Company | Compound mold and structured surface articles containing geometric structures with compound faces and method of making same |
| DE102004016285A1 (en) * | 2004-04-02 | 2005-10-20 | Fag Kugelfischer Ag | Ceramic rolling element for a roller bearing and method for its production |
| US9869190B2 (en) | 2014-05-30 | 2018-01-16 | General Electric Company | Variable-pitch rotor with remote counterweights |
| US10072510B2 (en) | 2014-11-21 | 2018-09-11 | General Electric Company | Variable pitch fan for gas turbine engine and method of assembling the same |
| JP2016196883A (en) * | 2015-04-06 | 2016-11-24 | ゼネラル・エレクトリック・カンパニイ | Fan bearings for turbine engine |
| US10100653B2 (en) | 2015-10-08 | 2018-10-16 | General Electric Company | Variable pitch fan blade retention system |
| US11674435B2 (en) | 2021-06-29 | 2023-06-13 | General Electric Company | Levered counterweight feathering system |
| US12180886B2 (en) | 2021-06-29 | 2024-12-31 | General Electric Company | Levered counterweight feathering system |
| US11795964B2 (en) | 2021-07-16 | 2023-10-24 | General Electric Company | Levered counterweight feathering system |
| CN114454066A (en) * | 2021-10-21 | 2022-05-10 | 北京机科国创轻量化科学研究院有限公司 | Grinding equipment for removing attachments on surface of ceramic roller |
| EP4667762A1 (en) * | 2024-06-20 | 2025-12-24 | NTN Corporation | Roller and roller bearing |
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| Publication number | Publication date |
|---|---|
| JP2984127B2 (en) | 1999-11-29 |
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