Tài liệu HANDBOOK OFADVANCED CERAMICS MACHINING docx

[...]... Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 8 6.10.2006 2:05am Handbook of Advanced Ceramics Machining 8 Tension Compression FIGURE 1.6 Stress distribution in the workspace during cutting (undeformed chip thickness is 1 mm) Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 9 6.10.2006 2:05am Ductile Grinding of Ceramics: Machine... diagram, but is not precisely correspondent to the thermal and dynamical environments in the actual 3D-grinding zone Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 6 6.10.2006 2:05am Handbook of Advanced Ceramics Machining 6 In machining of brittle materials, it is generally known that ductile behavior is achieved when the specific material removal unit is small... Japan Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C000 Final Proof page xiii 18.10.2006 6:35pm Contents 1 Ductile Grinding of Ceramics: Machine Tool and Process 1 H Eda 2 Ductile-Mode Ultra-Smoothness Grinding of Fine Ceramics with Coarse-Grain-Size Diamond Wheels 29 H Yasui 3 Mechanisms for Grinding of Ceramics 55 S Malkin and T.W Hwang 4 Grinding of Ceramics with Attention... Holl, and N.-A Daus Index 355 Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 1 6.10.2006 2:05am 1 Ductile Grinding of Ceramics: Machine Tool and Process H Eda CONTENTS 1.1 Ceramics and Metals 1 1.2 Brittle Materials and Grinding 4 1.3 In-Site Observation of Ductile Behavior in Ceramics 9 1.3.1 Scratch at the Brittle-Mode ... toughness, KIC Ductile > Brittle [jj] Weibull coefficient, m Ductile > Brittle [jjj] Crack growth rate, n Ductile < Brittle 1 Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 2 6.10.2006 2:05am Handbook of Advanced Ceramics Machining 2 s s Yield stress ∼ sy Crack formation stress Microplastic = emp stress sf sy H′ Elastic deformation Chip formation Elastic strain sy... the material (approximately about 4000–6000 m=sec) dC ¼ dt sffiffiffi E r where E is Young’s modulus and r the material density (1:4) Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 4 6.10.2006 2:05am Handbook of Advanced Ceramics Machining 8 4 Final crack KI > KIC Cc dCc = 4000−6000 m/s dt Crack rate dC dt Kt = KIC Grinding surface Main crack 2 (Cc = E /r) dCI < = 150 m/s...Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C000 Final Proof page x 18.10.2006 6:35pm Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C000 Final Proof page xi 18.10.2006 6:35pm Contributors Th Ardelt Institute for Machine Tools and Factory Management, Technical... I.D Marinescu 10 Mono- Versus Polycrystalline Diamond Lapping of Ceramics 247 M Pruteanu, I Benea, and I.D Marinescu Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C000 Final Proof page xiv 18.10.2006 6:35pm 11 Double Fracture Model in Lapping of Ceramics 257 I.D Marinescu 12 Double Side Grinding of Advanced Ceramics with Diamond Wheels 263 C.E Spanu, I.D Marinescu,... the chipping caused by lateral cracks is visible Such cracks undergo a periodical initiation-growth-fracture process, vary the Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 10 6.10.2006 2:05am Handbook of Advanced Ceramics Machining h 10 sy ≤ s < s f Fn Diamond indenter F = 20° Indentation cavity Ft Fn W or k F pie ce Scratching groove dp d Plastically deformed zone... are visibly generated Over the scratching process, the normal force Fn and the scratching force Ft applied to the indenter are Ioan D Marinescu /Handbook of Advanced Ceramics Machining 3837_C001 Final Proof page 12 6.10.2006 2:05am Handbook of Advanced Ceramics Machining 12 Indentation cavity Lateral crack FIGURE 1.8 SEM micrograph of brittle indentation made on surface of TRC 5 recorded as shown in Figure . class="bi x0 y0 w0 h0" alt="" HANDBOOK OF ADVANCED CERAMICS MACHINING Ioan D. Marinescu /Handbook of Advanced Ceramics Machining 3837_C000 Final Proof. 6:35pm Ioan D. Marinescu /Handbook of Advanced Ceramics Machining 3837_C000 Final Proof page ii 18.10.2006 6:35pm HANDBOOK OF ADVANCED CERAMICS MACHINING E DITED