Metal Machining - Theory and Applications Episode 2 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 ... lathe; 1 min 12 x 12 x 4 3.00–6.00 1.10–1.90 for insert tooling on turning 25 x 25 x 7 9.00–11 .20 2. 65–3 .20 centre ceramic insert, plain 12 x 12 x 4 4.50–9.00 1.50 2. 70...

Ngày tải lên: 21/07/2014, 17:20

... 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 (mm) P10 Sintered steel P10 B11 12 TiC-Al 2 O 3 ... dynamometer with its bridge circuit Childs Part 2 28:3 :20 00 3:10 pm Page 1 42 5.1 .2 Other chip form and wear observations Careful observation of tools and chips...

Ngày tải lên: 21/07/2014, 17:20

... 6.4.8. Non-orthogonal (three-dimensional) machining 181 Fig. 6.15 Uncut chip cross-sections in single point turning: (a) case 1, (b) case 2, (c) case 3 and (d) case 4 (a) Childs Part 2 28:3 :20 00 3: 12 ... h c e h (x′)=L 2 e h (X)= { cos a n cos h c } (6 .25 a) –sin l s sin h c –cos l s sin a n cos h c Non-orthogonal (three-dimensional) machining 187 Childs Part 2 28:3 :20...

Ngày tải lên: 21/07/2014, 17:20

... Stream-lines of the flow of a 0.13%C free-cutting steel and (b) a simplification for later analysis (Section 6.3 .2) Childs Part 2 28:3 :20 00 3: 12 pm Page 170 6 .2. 1 Slip-line field theory Slip-line ... 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 1...

Ngày tải lên: 21/07/2014, 17:20

... at 23 9 m/min (Yamane and Narutaki, 1983) Depth of cut: 1.0 mm Feed rate: 0 .2 mm rev –1 or tooth –1 Childs Part 1 28 :3 :20 00 2: 41 pm Page 126 hard particles against the cutting tool. The hard particles ... gives a straight line, the slope of which is –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 4 Tool damage...

Ngày tải lên: 21/07/2014, 17:20

... 1000°C TiC 7.4–7.7 ≈ 450 24 –33 38–41 TiN 9.4 ≈ 25 0 19 21 25 26 Al 2 O 3 8.4–9.0 ≈ 400 20 28 6–7.5 WC-Co* 4.5–6.0 550–650 75– 120 50–75 WC-TiC-TaC-Co* 5.8–6.8 490–560 25 –55 20 –50 Co ≈ 12 ≈ 180 70 – * from ... 300–500 Si 3 N 4 /Sialon 15–30 2. 1 2. 3 3 .2 3.6 28 0– 320 650–1500 HSS 19 24 3.6–3.8 12 13 22 0 24 0 940–1740 *: information from limited data; **: assumed as for diamo...

Ngày tải lên: 21/07/2014, 17:20

... Carbide CVD coated 0 .2 0.5 3–7 1 .2 1.9 2. 8 1.8 Ground 0.1–0 .25 2 4 1 .2 1.9 2. 8 1.8 Super-finished 0.03 0.4 1 .2 1.9 2. 8 1.8 Childs Part 1 28 :3 :20 00 2: 38 pm Page 73 2. 4.3 Wear in metal cutting Finally, ... map Childs Part 1 28 :3 :20 00 2: 38 pm Page 78 and PE 2 in Figure 2. 25. PE 1 represents theoretical analyses (Appendix 3) when the rough- ness is imagine...

Ngày tải lên: 21/07/2014, 17:20

... 300–500 120 –400 500–800 500–700 ρ C [MJ/m 3 ] ≈ 3.5 ≈ 3.5 ≈ 2. 5 ≈ 4.0 ≈ 2. 2 k/ ρ C 110 22 0 85–140 50–160 120 20 0 22 0– 320 ∆T 1 [°C] a 23 0–470 180–300 110–340 25 0–430 470–680 K work [W/m K] 25 –45 ... [ U work f tan φ / κ ]; (b) iso- β lines ( β = 0.15 and 0.3) mapped onto a ( U work , f ) plane for κ = 3, 12 and 50 mm 2 /s and φ = 25 º Childs Part 1 28 :3 :20 00...

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 ... forces and chip/tool contact length, by combining equations (2. 2), (2. 5) and (2. 6). Figure 12( c) is associated with a peak contact stress with the cutting edge 50% larger than...

Ngày tải lên: 21/07/2014, 17:20

... Method (ICM) 21 2 7.4 Material flow stress modelling for finite element analyses 22 0 References 22 4 8 Applications of finite element analysis 22 6 8.1 Simulation of BUE formation 22 6 8 .2 Simulation ... formation 23 4 8.3 Machinability analysis of free cutting steels 24 0 8.4 Cutting edge design 25 1 8.5 Summary 26 2 References 26 2 9 Process selection, improvement and contr...

Ngày tải lên: 21/07/2014, 17:20