Study on Cutting Force, Cutting Temperature and Machining Residual Stress in Precision Turning of Pure Iron with Different Grain Sizes

Chinese Journal of Mechanical Engineering

Table 6 Measurement results of residual stresses on the surface of coarse and fine grain pure iron

Number	Coarse grain \(\sigma_{c}\)(MPa)	Fine grain \(\sigma_{c}\)(MPa)	\(w_{{\sigma_{c} }} \%\)	Coarse grain \(\sigma_{f}\) (MPa)	Fine grain \(\sigma_{f}\)(MPa)	\(w_{{\sigma_{f} }} \%\)
1	214	219	↓− 73.89	− 45	− 12	↑2.22
2	249	270	↑18.00	75	89	↑8.75
3	309	312	↑16.54	127	148	↑0.81
4	381	234	↓− 21.30	100	79	↓− 38.58
5	356	359	↓− 2.80	143	139	↑0.84
6	403	314	↑18.75	224	266	↓− 22.19
7	438	425	↑37.11	113	154	↓− 3.08
8	439	365	↓− 36.02	220	141	↓− 16.91
9	409	321	↓− 30.18	164	115	↓− 21.56
10	461	386	↑26.39	144	182	↓− 16.37
11	401	396	↓− 57.41	270	115	↓− 1.43
12	396	431	↑8.23	216	234	↑8.71
13	394	432	↓− 13.25	145	126	↑9.72
14	414	413	↑36.44	159	216	↓− 0.18
15	428	430	↑23.61	229	283	↑0.41
16	384	439	↑9.78	276	303	↑14.26