Mathematical Modeling of the Bearing Ratio Curve Rmr (50% Rz), through Investigation of the Effect of Process Parameters in Hard Turning of Steel C55 (DIN) with Mixed Ceramics MC2 (Al₂O₃ + TiC)

Table 3

Four factorial first-order design of the experiment (real matrix).

Experiment No.	Input (process) parameters					Rmr (50 Rz) (%)	Roughness Rz (μm)
	X0	v	f	a	r
1	1	64.00	0.1	0.39	0.85	38.50	2.930
2	1	130.0	0.1	0.39	0.85	30.13	2.970
3	1	64.00	0.314	0.39	0.85	25.87	15.067
4	1	130.0	0.314	0.39	0.85	28.00	14.333
5	1	64.00	0.1	0.81	0.85	23.13	3.623
6	1	130.0	0.1	0.81	0.85	51.03	2.753
7	1	64.00	0.314	0.81	0.85	29.03	15.500
8	1	130.0	0.314	0.81	0.85	28.23	14.400
9	1	64.00	0.1	0.39	1.55	33.50	2.073
10	1	130.0	0.1	0.39	1.55	53.20	1.443
11	1	64.00	0.314	0.39	1.55	36.37	7.093
12	1	130.0	0.314	0.39	1.55	40.10	6.393
13	1	64.00	0.1	0.81	1.55	39.17	1.767
14	1	130.0	0.1	0.81	1.55	44.93	1.870
15	1	64.00	0.314	0.81	1.55	30.10	7.720
16	1	130.0	0.314	0.81	1.55	3433	8.360
17	0	94.00	0.180	0.570	1.14	25.97	5.290
18	0	94.00	0.180	0.570	1.14	23.95	5.590
19	0	94.00	0.180	0.570	1.14	24.30	5.280
20	0	94.00	0.180	0.570	1.14	19.93	4.587