Metal Machining - Theory and Applications 2008 Part 2 pps

... cell-oriented 0.15 0 .27 2. 50 g* insert ceramic centre CNC/15 FMS* 0 .22 0.34 2. 50 Fig. 1 .27 Costs associated with the examples of Figure 1 .26 , a–g as in Table 1.6 Childs Part 1 28 :3 :20 00 2: 35 ... mm 2 [ α n c fd] = 1 mm 2 [ α n c fd] = 0.5 mm 2 V vol [mm 3 ] 960 29 5000 29 5000 f mach 0.65 0.65 0.65 n c fd [mm 2 ]2 4 2 C [m/min] 180 150 180 n 0 .25 0 .25 0 .25 t...

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... –C 2 . dhC 2 —= C 1 exp [ – —— ] (4.1a) dt q 122 Tool damage Childs Part 1 28 :3 :20 00 2: 41 pm Page 122 5.1 .2 Other chip form and wear observations Careful observation of tools and chips after machining ... turning free-cutting steel B11 12 and difficult-to-cut sintered steel and Inconel 718 0.05 0. 02 0.1 0 .2 0.5 1.0 2. 0 5 10 20 40 60 80 99 85 Flank wear VB (...

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... 3(s xx ′ 2 + s yy ′ 2 + s zz ′ 2 ) + 6(s 2 xy + s 2 yz + s 2 zy ) ≡ (s xx – s yy ) 2 + (s yy – s zz ) 2 + (s zz – s xx ) 2 + 6(s 2 xy + s 2 yz + s 2 zy ) = 6k 2 or 2Y 2 (A1 .26 b) which is the same ... s r 2 . So s r is also a stress invariant (it is known as the second stress invariant). From equation (A1 .25 ) s r 2 = s 2 xx + s 2 yy + s 2 zz +2( s 2...

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... 26 2 References 26 2 9 Process selection, improvement and control 26 5 9.1 Introduction 26 5 9 .2 Process models 26 7 9.3 Optimization of machining conditions and expert system applications 28 3 9.4 Monitoring and ... Figure 1.16. 12 Introduction Fig. 1. 12 Examples of turning and milling solid, brazed and insert tools Childs Part 1 28 :3 :20 00 2: 33 pm Page 12 A...

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... Experimentally derived slip-line fields for slow speed machining of mild steels, after (a) Palmer and Oxley (1959), and (b) Roth and Oxley (19 72) Childs Part 2 28:3 :20 00 3: 12 pm Page 169 of an AE ... in machining 153 Fig. 5 .20 Radiation from a black body Childs Part 2 28:3 :20 00 3:11 pm Page 153 region, the slip-line field predicted relationship between l and m for...

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... cutting process (Part 1). Trans. ASME J. Eng. Ind. 100, 22 2 22 8. Usui, E. and Hirota, A. (1978) Analytical prediction of three dimensional cutting process (Part 2) . Trans. ASME J. Eng. Ind. 100, 22 9 23 5. Usui, ... background 20 1 Childs Part 2 28:3 :20 00 3:14 pm Page 20 1 Kudo, H. (1965) Some new slip-line solutions for two-dimensional steady-state machining. Int. J. Mech....

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... 1983) Childs Part 2 28:3 :20 00 3:15 pm Page 22 1 22 8 Applications of finite element analysis Fig. 8.1 continued Childs Part 2 28:3 :20 00 3:16 pm Page 22 8 21 6 Finite element methods Fig. 7.14 Chip shape and ... formation 22 9 Fig. 8 .2 As for Figure 8.1 but at a cutting speed of 30 m/min; and just before convergence of the computation Childs Part 2 28:3 :20 00 3:16...

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... resulphurised free-cutting steels and cast irons. Wear 139, 195 20 8. 26 4 Applications of finite element analysis Childs Part 2 28:3 :20 00 3:19 pm Page 26 4 where g ic– and g i c+ are constants. The ... V 0 .27 ) } (9.2b) × (VB –0.66 – 0 .23 V 0 .27 ) (VN 0.03 – 0 .23 V 0 .27 ) F c = 1862f 0.94 d 1.11 + 26 77(VS 0 .24 – 0.05ln V) ×(VB 0 .23 – 0.05ln V) (VN 0.16 – 0.05ln V)...

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... tool (2. 1) power and maximum power: (25 kW, HP) ] (2. 2) torque and maximum torque: (N m, lb. ft) (2. 4) maximum cutting speed: (m/min, ft/min, 1450 rpm) (2. 6) power efficiency: (95%) (3) Machining ... 31:3 :20 00 10:38 am Page 29 3 322 Process selection, improvement and control Fig. 9.37 Effectiveness of pre -machining feed adjustment in controlling dimensional error (Takata...

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... 31 0.04–0 .25 C 52 60 48–54 42 45 35–37 29 –30 0 .25 –0.8C 51– 52 46–48 39– 42 33–35 29 –30 0.8–1.2C 45–51 42 46 37–39 32 33 27 29 low alloy 25 –49 30–45 32 40 30–35 27 –30 ferritic stainless 21 24 22 25 23 26 24 27 ... 24 27 25 29 austenitic stainless 14–17 15–18 17 21 22 25 26 29 high manganese 14 16 19 21 22 Aluminium pure, 1000 series 20 0 24 0 20 0 23 0 20 0 22 5...

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