Metal Machining - Theory and Applications Episode 2 Part 3 pot

... –0.000015(T 37 0) 2 a = 0.00 028 , 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 continued Childs Part 2 28 :3 :20 00 3: 17 pm Page 24 6 Figure ... m/min Table 8 .3 Coefficients of friction in characteristic equation (2. 24d) V=100 m/min V =20 0 m/min m µ n* m µ n* Steel P 1.0 2. 31 3. 89 1.0 2. 48 3...

Ngày tải lên: 21/07/2014, 17:20

... 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 27 29 low alloy 25 –49 30 –45 32 40 30 35 27 30 ferritic ... 27 30 ferritic 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 Alu...

Ngày tải lên: 21/07/2014, 17:20

... [mm] SVVBN2 525 M16 VBMM160404 53 P10 49 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 VNMG160408 53 P10 38 0.40 0.70 4 11 17 35 0.8 Childs Part 3 31 :3 :20 00 ... . (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....

Ngày tải lên: 21/07/2014, 17:20

... background 20 3 Fig. 7 .2 Eulerian and Lagrangian views of a plastic flow Childs Part 2 28 :3 :20 00 3: 14 pm Page 20 3 where D is the area of the element; and similarly for the other strains e yy and g xy . ... cos( η ′ c + ψ ) π f 1 / 2 — – ψ + sin –1 —— – { { r n cos( η ′ c – θ ) + f cos( η ′ c + ψ ) } 2 – f 2 – 2r n f cos( ψ + θ ) } 2 2r n Childs Part 2...

Ngày tải lên: 21/07/2014, 17:20

... cut, 38 Chip formation fundamentals Fig. 2. 2 (a and b) Orthogonal, (c) non-orthogonal and (d) semi-orthogonal chip formation. Childs Part 1 28 :3 :20 00 2: 35 pm Page 38 In the case of turning with a 90˚ ... undeformed layer Chip formation mechanics 43 Childs Part 1 28 :3 :20 00 2: 35 pm Page 43 than m. The common (m/n) value of 2 (from Figure 2. 10(a)) is consistent...

Ngày tải lên: 21/07/2014, 17:20

... √* √* √* 33 00 93. 9 1 1.1 – – – – 91 0 1 8 32 0 0 14 .2 0.8 K20 90.5 6 3. 5 32 6 0 13. 7 1.0 – – – K05 20 √* √* √* √* 33 00 15.4 0.9 17 28 0 3. 0 K01 30 √* √* √* 33 00 15.7 0.8 – – – – 80 6 4 10 32 0 0 15.7 ... E α e code Si 3 N 4 Y 2 O 3 Al 2 O 3 Other [kg/m 3 ] [GPa] [GPa] [W/mK] [GPa] [10 -6 K -1 ] K01–10 √* √* √* 32 5 0 94.5 1 0.9 – – – K20 96 2 2 31 60 15.7...

Ngày tải lên: 21/07/2014, 17:20

... (p r / τ max )(p r / τ max )/c Spherical 0. 42 2.6 6 .2 Cylindrical 0 .39 2. 2 5.6 Conical 0.50 1.6 3 .2 Wedge-like 0.50 1.0 2. 0 Childs Part 3 31 :3 :20 00 10: 43 am Page 36 6 (trailing) the real contact mean ... d l d l Numerical (finite element) methods 35 9 Childs Part 3 31 :3 :20 00 10: 42 am Page 35 9 p r = p 2 + k (A3.10) Slip-line EDBC is an a-line, so p 2 =...

Ngày tải lên: 21/07/2014, 17:20

... d(de kl )(de ij ) 0 3( de – 0 ) 2 ∂(de kl ) (A1 .34 ) Constitutive equations for numerical modelling 34 3 Childs Part 3 31 :3 :20 00 10: 42 am Page 34 3 A1 .2. 3 Velocity relations in a slip-line field Analogous ... the results, a 34 6 Appendix 1 Childs Part 3 31 :3 :20 00 10: 42 am Page 34 6 p A + 2kf A = p B + 2kf B; p C + 2kf C = p D + 2kf D (A1.19) p A + 2kf A = p D –...

Ngày tải lên: 21/07/2014, 17:20

... ′: s m =(s 1 + s 2 + s 3 ) /3 s 1 ′ = s 1 – s m ≡ 2s 1 /3 – (s 2 + s 3 ) /3 s 2 ′ = s 2 – s m ≡ 2s 2 /3 – (s 3 + s 1 ) /3 } (A1.1) s 3 ′ = s 3 – s m ≡ 2s 3 /3 – (s 1 + s 2 ) /3 Hydrostatic stress plays no part ... s m 3. OP is s r ′. By vector 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...

Ngày tải lên: 21/07/2014, 17:20

... g ic+ (9 .32 a) g i c+ – g ic– 0 g ic+ < g i (x) Optimization of machining conditions 29 1 Childs Part 3 31 :3 :20 00 10 :38 am Page 29 1 Even if the pre-machined corner has the same radius ( 12. 7 mm) ... the Optimization of machining conditions 28 3 Childs Part 3 31 :3 :20 00 10 :38 am Page 28 3 t mach t mach t total = t load + ——— + t ct ——— f mach T } (9.16d) pDLd...

Ngày tải lên: 21/07/2014, 17:20