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Orthogonal machining of a steel workpiece is done with a HSS tool of zero rake angle. The ratio of the cutting force and the thrust force on the tool is 1 : 0.372. The length of cut chip is 4.71 mm while the uncut chip length is 10 mm. What is the shear plane angle φ and friction angle β in degree?
Use Merchants theory
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- 32.49, 10.22
- 25.22, 20.41
- 64.78 20.41
- 25.22, 23.21
- 32.49, 10.22
Correct Option: B
| α = 0 , | = | , Lc = 4.71 , Luc = 10 mm | ||
| FT | 0.372 |
| = | = | = r | ||||
| LUC | t2 | 10 |
r = 0.471 chip reduction coefficient
| tanβ = | , where α = 0 | |
| FC |
β = tan–1(0.372) = 2071°
| tanφ = | ||
| 1 - rsinα |
| tanφ = | ||
| 1 - 0.471sin0 |
