Metal Machining - Theory and Applications Episode 2 Part 7 ppt

... 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 representatio...

Ngày tải lên: 21/07/2014, 17:20

... Total metal: 14 –* 70 00 15 .7 2. 3 11 P20 Total carbide: 82 Total metal: 18 –* 70 00 14 .2 2.5 16 P01 20 Total carbide: 87 Total metal: 13 2 6600 16 .7 1.5 25 P10–30 Total carbide: 83 Total metal: 17 2 ... [W/mK] P01–10 50 16 20 6 8 < 2 6900 16 .2 1 .2 20 P05 25 49 16 15 8 12 < 2 70 00 14 .2 1.8 20 P01–15 48 16 20 5 11 –* 70 00 15 .7 –* 20 P05 Total...

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 2...

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 ... (International Standard, 1995), has been established as: F d = 500f 0.46 d 0.810 + 23 77 (VS 1.93 – 0.007ln V) × (VB 0 .26 – 0.007ln V) (VN –0.33 – 0.007ln V) F f = 629 f...

Ngày tải lên: 21/07/2014, 17:20

... damage and its classification 125 WC-Co cemented carbide tools WC-(Ti, Ta, W)C-Co cemented carbide tools Fig. 4 .7 Model of diffusion wear, after Naerheim and Trent (1 977 ) Childs Part 1 28 :3 :20 00 2: 41 ... removal. Naerheim and Trent (1 977 ) have proposed that the wear rates of both WC-Co (K-grade) and WC-(Ti,Ta,W)C-Co (P-grade) cemented carbides are controlled by the rate...

Ngày tải lên: 21/07/2014, 17:20

... 30–35 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 Aluminium pure, 1000 series 20 0 24 0 20 0 23 0 20 0 22 5 190 22 0 ... 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...

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 ... equations (A2 .26 ) and (A2 . 27 ), to form equation (A2 .20 b), or similarly in two-dimensions, forms the thermal part of closely coupled steady state thermal–plastic fi...

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 ... Applicability 1 C** 5 4 3 0 .78 56 2* K 16 04 08 0 .75 34 3 C** 5 4 3 0 .7 0 27 4 C** 5 4 3 0 .7 0 27 *: this is coded in ISO standard; **: types of chip are different. Childs...

Ngày tải lên: 21/07/2014, 17:20

... temperature distri- butions in Figure 9 .7( a) and the flank contact temperatures and stresses in Figure 9 .7( b) Process models 27 7 Childs Part 3 31:3 :20 00 10: 37 am Page 27 7 ... requirements. 27 4 Process selection, improvement and control Fig. 9.5 Milling of scroll surfaces Childs Part 3 31:3 :20 00 10: 37 am Page 27 4 Optimization of machining conditions 28 7...

Ngày tải lên: 21/07/2014, 17:20

... –0.000015(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 ... (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 .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...

Ngày tải lên: 21/07/2014, 17:20