Metal Machining - Theory and Applications Episode 2 Part 8 pptx

... 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 ... slip-line is tangential to X, sin 2f = 0 and cos 2f = 1 and ∂∂ —— (p + 2kf) = 0; —— (p – 2kf) = 0 (A1.18c) ∂x ∂y or p + 2kf = constant along an a-line; p – 2kf =...

Ngày tải lên: 21/07/2014, 17:20

... analysis Childs Part 2 28: 3 :20 00 3: 18 pm Page 25 3 strain rate for the plane-faced tool and type I and II tools with K = 1 .2. The type I tool produces narrower plastic regions in the chip and workpiece, and ... configuration when machining 18% Mn– 18% Cr steel at a cutting speed of 60 m/min, f = 0 .2 mm and d = 2 mm with (a) conventional, (b) type I and (c) type...

Ngày tải lên: 21/07/2014, 17:20

... [W/mK] P01–10 50 16 20 6 8 < 2 6900 16 .2 1 .2 20 P05 25 49 16 15 8 12 < 2 7000 14 .2 1 .8 20 P01–15 48 16 20 5 11 –* 7000 15.7 –* 20 P05 Total carbide: 94 Total metal: 6 –* 6100 17 .2 1 .8 –* P10 Total ... 127 –9 Objective function 28 4 Operation variables 26 7 Optimization of machining 24 – 32 constraints on 28 5–6, 29 9 cutting speed for 28 8 90 feasi...

Ngày tải lên: 21/07/2014, 17:20

... stainless 21 24 22 25 23 26 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 5 190 22 0 – 20 00 to 7000 ... and steel pure iron* 85 64 50 38 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...

Ngày tải lên: 21/07/2014, 17:20

... u˘ z d l hD ikj 21 10 + —— [ 121 0 ] 12 1 120 0000 (A2 .26 ) and 11 1 q*V e 1 qD ikj 1 hT 0 D ikj 1 {F} e = ——— {} – ——— {} – ——— {} (A2 .27 ) 4 1 3 1 3 1 10 0 Global assembly of equations (A2 .20 a), with ... Lond. 188 , 627 –6 38. 3 62 Appendix 2 Childs Part 3 31:3 :20 00 10: 42 am Page 3 62 In the following sections, a view of how sliding friction depends on material pro...

Ngày tải lên: 21/07/2014, 17:20

... addition s r ′ 2 = s r 2 –3s m 2 =(s 1 2 + s 2 2 + s 3 2 ) – 3s m 2 (A1.5) After substituting for s m from equation (A1.1), 3s r ′ 2 =(s 1 – s 2 ) 2 +(s 2 – s 3 ) 2 +(s 3 – s 1 ) 2 (A1.6) The yield ... stresses: 1 s – 2 =— [ (s 1 – s 2 ) 2 +(s 2 – s 3 ) 2 +(s 3 – s 1 ) 2 ] = Y 2 or 3k 2 (A1.7) 2 330 Appendix 1 Fig. A1 .2 Geometrical representation...

Ngày tải lên: 21/07/2014, 17:20

... 0.10 0.33 5 12 17 35 0.4 MVVNN2 020 M16 VNMG160404 53 P10 45 0 .20 0. 48 4 11 17 35 0.4 MVVNN2 020 M16 VNMG1604 08 53 P10 38 0.40 0.70 4 11 17 35 0 .8 Childs Part 3 31:3 :20 00 10:39 am Page 29 8 Pattern recognition ... . (4.5 .2) size: (4.6) availability Childs Part 3 31:3 :20 00 10:39 am Page 3 02 of tool or workpiece, etc, are measured in-process or out-of-process. In-process...

Ngày tải lên: 21/07/2014, 17:20

... 10: 38 am Page 28 8 Optimization of machining conditions 28 9 Fig. 9.11 Optimal conditions and lines of minimum cost in (a) ( f , d ) and (b) ( V , f ) planes (a) (b) Childs Part 3 31:3 :20 00 10: 38 ... d R ) 2 – (r w – d e ) 2 = R 2 – (R – d e ) 2 } (9.9a) for a convex survace (r w + d R ) 2 – (r w + d e ) 2 = R 2 – (R – d e ) 2 Hence d e 2r w – d R for a con...

Ngày tải lên: 21/07/2014, 17:20

... 1.0 2. 31 3 .89 1.0 2. 48 3 .22 Steel X 0.99 1 .25 3.05 0.96 1.43 2. 06 Steel Y 0.97 0.76 5. 98 0.99 1.04 3.04 Steel L 0.74 0. 38 8. 78 0 .88 0. 72 4 .21 Childs Part 2 28: 3 :20 00 3:17 pm Page 24 4 With other ... –0.000015(T–370) 2 a = 0.00 0 28 , m = 0.0016 Childs Part 2 28: 3 :20 00 3:17 pm Page 24 2 24 6 Applications of finite element analysis Fig. 8. 16 continu...

Ngày tải lên: 21/07/2014, 17:20

... 21 3 Fig. 7. 12 Developed flow-chart of the iterative convergence method Childs Part 2 28: 3 :20 00 3:15 pm Page 21 3 22 8 Applications of finite element analysis Fig. 8. 1 continued Childs Part 2 28: 3 :20 00 ... 181 6–1 82 5 . Zerilli, F. J. and Armstrong, R. W. (1997) Dislocation mechanics based analysis of materials dynam- ics behaviour. J. de Physique IV 7(C8), 637–6 4...

Ngày tải lên: 21/07/2014, 17:20