R&D Center, Karuizawa, Japan R&D Center, PMDM GmbH, Bang Pa-in, Thailand Villingen, Germany R&D Center R&D Center, Technical Center, Michigan, USA Chai Chee, Singapore March 23, 2001 NMB
． R&D Center 7 1. Collaborated Organization and Its Major Activity Fields. 2. HDD Major Technology. 3. Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). - Grease Development for RO (Ball) Bearing - Steel Alloy Development (Free-Machining Stainless Steel) 4. Chemical Integration (Spindle Motor) 5. Summary. March 23, 2001 NMB
． R&D Center 7 Collaborated Organization and It’s Major Activity Fields. 1. PM DM GmbH Technical Center (USA) Karuizawa R&D Center (17) (7) (2) Cleanliness Technology Tribology Lab. Metal Surface Bearing Evaluation Lab. Treatment Lab. (5) (6) (3) (3) Thai R&D Center S’pore R&D Center Shanghai R&D Center (2) (39) (9) Karuizawa Cleanliness Technology Plan Client Support “Clean Room” Laundry Bearing Manufacturing Support Material Science Component Reliability Corrective Do Action Tribology Sample Trials Grease Production See Evaluation ※ Figures in ( ) are the numbers of HDD Related R&D Engineer : total 76 Staffs Thai R&D S’Pore R&D March 23, 2001 USA R&D NMB
． R&D Center 7 HDD Major Technology. 2. ! CHANNEL INTEGRATION － R/W CHANNEL － CODING － SERVO ! MECHANICAL INTEGRATION － HEAD/DISK TECHNOLOGY － OTP/TMR ! CHEMICAL INTEGRATION － RELIABBILITY － CLEAN TECHNOLOGY Spindle Motor/Pivot Assembly March 23, 2001 NMB
． R&D Center 7 ． Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). 3 SPINDLE MOTOR PIVOT ! Higher Rotation (Bearing) ! Shorter Access Time Steel Ball, Grease Development Low Hystersis Ceramic Ball Thermal Expansion Matching ! Low Noise ! Low Friction Torque Grease → Oil Bearing Cleanliness Improvement ! Low NRRO(Lower Than 0.3 μ m ） ! Outgassing Improvement RO Bearing rather than Sulfur Contained Free-Machining Conventional (Discrete) Bearing Steel Improvement ! Low Friction Torque And high Anti-Fretting Low Outgassing Adhesive Grease Development Less Outgassing Grease ! Less Outgassing Development ! Light Weight Polymers Stainless Steel → Nonferrous Metals Sulfur Contained Free-Machining Steel Improvement March 23, 2001 NMB
． R&D Center 7 ． Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). 3 LUBRICATING GREASE STRUCTURE 、 Na….) SOAP SOAP (Li THICKENER ORGANIC (UREA,PTFE) NON-SOAP INORGANIC (SILICAGEL, TREATED CLAY) MINERAL (PETROLEUM) GREASE BASE OIL SYNTHETIC (POLY- α -OLEFIN, DIBASIC ACID ESTER, ） POLYOL ESTER, SILICONE, FLUORINATED OIL ADDITIVE (ANTIOXIDANTS, CORROSION INHIBITORS, EXTREME PRESSURE ADDITIVES, etc.) GREASE CONSISTS OF APPROX. 80% TO 90% OIL, APPROX. 10% TO 20% THICKENER AND APPROX. 1% TO 5% STIFFENER ADDITIVES. March 23, 2001 NMB
． R&D Center 7 ． Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). 3 Old and Current Li Soap New Li Soap March 23, 2001 NMB
． R&D Center 7 ． Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). 3 Steel Alloy Development (Spindle Motor And Pivot Assembly) Spindle Motor 6061T-6 Nonferrous Metal Hub Stainless Steel SUS430F QSF190L DHS-1 (Ferritic) SF-20T Stainless Steels Pivot Assy. NBK3HM Ferritic Type Shaft : Austenitic SUS303Cu ASK3000SM Sleeve : Martensitic SUS420F Work Hardening Type March 23, 2001 NMB
． R&D Center 7 ． Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). 3 SUS 430F ( Mn/S Ratio ; 4.43 ) March 23, 2001 NMB
． R&D Center 7 ． Sustaining The HDD Technology Innovation (Spindle Motor and Pivot Assembly). 3 IMPROVEMENT OF SULFUR OUTGAS ON ALLOY STEEL SILVER COUPON CORROSION TEST MATERIAL SULFUR LEVEL Mn/S Cr(%) Ferritic SUS430F 5 4.5 17 DHS-1 0 1.2 19 Austenitic Stainless Steel SUS303Cu 2 5.0 17.8 ASK3000SM 1 5.0 18.7 Level 0 Level 1 Level 2 March 23, 2001 Level 3 Level 4 Level 5 NMB
． R&D Center 7 Chemical Integration (Spindle Motor) 4. CHEMICAL INTEGRATION AND SPINDLE MOTOR Thermal CONTAMINANTS Asperity RELIABILITY ANALYSIS METHOD Head Disk Hard Particle Interference LPC SEM/EDX Stiction Organics (Silicone, Amine) FT-IR Corrosion Siloxisane DHS-GC-MS Sulfur Lock Ionics ESCA(XPS) I.C. Cleanliness Oil March 23, 2001 NMB
． R&D Center 7 Chemical Integration (Spindle Motor) 4. CHEMICAL INTEGRATION AND SPINDLE MOTOR E lectrostatic S pectroscopy for C hemical A nalysis ( X -Ray P hotoelectron S pectroscopy) March 23, 2001 NMB
． R&D Center 7 5. Summary Chemical Integration Supports HDD Components Technology Spindle Motor Outgas RO (Ball) FDB Bearing Grease Oil Cleanliness Precision Machining March 23, 2001 NMB
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