Table 2.

Orthogonal test table.

Serial numbers	Combinations	Corresponding parameters
		$D_2/\text{mm}$	$b_2/\text{mm}$	$Z$	${\beta }_2{/}^{\circ }$
1	$A_1{B}_1{C}_1{D}_1$	290	13	5	24
2	$A_1{B}_2{C}_2{D}_2$	290	11	6	26
3	$A_1{B}_3{C}_3{D}_3$	290	9	7	22
4	$A_2{B}_1{C}_2{D}_3$	295	13	6	22
5	$A_2{B}_2{C}_3{D}_1$	295	11	7	24
6	$A_2{B}_3{C}_1{D}_2$	295	9	5	26
7	$A_3{B}_1{C}_3{D}_2$	300	13	7	26
8	$A_3{B}_2{C}_1{D}_3$	300	11	5	22
9	$A_3{B}_3{C}_2{D}_1$	300	9	6	24