Metal Machining - Theory and Applications Episode 2 Part 5 ppsx

... 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 concave surface c r = — = ———— d R 2r w – ... rigid. Optimization of machining conditions 28 5 Childs Part 3 31:3 :20 00 10:38 am Page 28 5 depends only on the maximum principal stress. T represents 90%, R 50 %...

Ngày tải lên: 21/07/2014, 17:20

... [W/mK] P01–10 50 16 20 6 8 < 2 6900 16 .2 1 .2 20 P 05 25 49 16 15 8 12 < 2 7000 14 .2 1.8 20 P01– 15 48 16 20 5 11 –* 7000 15. 7 –* 20 P 05 Total carbide: 94 Total metal: 6 –* 6100 17 .2 1.8 –* P10 ... application to built-up edge formation 22 6–34 chip control (grooved-rake tool) 25 1 2 high manganese steel machining 21 5 17 machining a-brass 20 6–7 th...

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...

Ngày tải lên: 21/07/2014, 17:20

... (3.9) (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 366 (trailing) the real contact ... 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 Glo...

Ngày tải lên: 21/07/2014, 17:20

... 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...

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 representati...

Ngày tải lên: 21/07/2014, 17:20

... [mm] SVVBN2 52 5 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 ... 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, 1 450 rpm) (2. 6) pow...

Ngày tải lên: 21/07/2014, 17:20

... 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) where F d , F f , and F c are ... mm Childs Part 2 28:3 :20 00 3:18 pm Page 25 5 Vyas, A. and Shaw, M. C. (1999) Mechanics of saw-tooth chip formation in metal cutting. Trans ASME J. Manuf. Sci. and E...

Ngày tải lên: 21/07/2014, 17:20

... 0. 055 e –0.0000 15( T–370) 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 ... = 0.185e –0.0007T + 0. 055 e –0.0000 15( T–370) 2 a = 0.00 024 , m = 0.0019 Steel X A = 880e –0.0011T + 120 e –0.00009(T– 150 ) 2 + 150 e –0.000 02( T...

Ngày tải lên: 21/07/2014, 17:20

... (ICM) 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 ... steel: dashed line at 20 ºC and a strain rate of 10 –3 s –1 ; solid lines at strain rate of 10 3 s –1 and temperatures as marked Childs Part 2 28:3 :20 0...

Ngày tải lên: 21/07/2014, 17:20