杨翠苹等：楔横轧反楔堆轧改善空心零件过渡轴肩的壁厚减薄 *1171· 径向应力MPa 周向应力MPa a 150.0■ b 200.0■ 33.3 33.3 -83.3 -133.0 -200.0 -300.0 轴向应力/MPa (c) 150.0■ 33.3 83.3 -200.0 图7楔入时刻的应力场.(a)径向应力：(b)周向应力：(c)轴向应力 Fig.7 Stress fields in the knifing stage:(a)radial stress:(b)circumferential stress:(c)axial stress 径向应变 周向应变 (a) 0.2000■ 8 0.0667 0.0500 0.0667 0.1500 -0.200 -0.2500 轴向应变 ⊙ 0.2000■ 0.0833 -0.0333 0.1500 图8楔入时刻的应变场.(a)径向应变：(b)周向应变：(c)轴向应变 Fig.8 Strain fields in the knifing stage:(a)radial strain:(b)circumferential strain:(c)axial strain 轴向位移/mm 轴向位移mm 1.000■ (b) 2.000■ 0.333 0.333 -0.333 -1.330 -000 3.000 图9轴向位移分布.(a)楔入阶段：(b)展宽阶段 Fig.9 Axial displacement distribution:(a)knifing stage:(b)stretching stage 通过上述分析可知：楔横轧成形空心零件时，在楔入过程中由于楔尖位置被轴向拉伸而发生壁厚减薄，杨翠苹等: 楔横轧反楔堆轧改善空心零件过渡轴肩的壁厚减薄 图 7 楔入时刻的应力场． ( a) 径向应力; ( b) 周向应力; ( c) 轴向应力 Fig． 7 Stress fields in the knifing stage: ( a) radial stress; ( b) circumferential stress; ( c) axial stress 图 8 楔入时刻的应变场． ( a) 径向应变; ( b) 周向应变; ( c) 轴向应变 Fig． 8 Strain fields in the knifing stage: ( a) radial strain; ( b) circumferential strain; ( c) axial strain 图 9 轴向位移分布． ( a) 楔入阶段; ( b) 展宽阶段 Fig． 9 Axial displacement distribution: ( a) knifing stage; ( b) stretching stage 通过上述分析可知: 楔横轧成形空心零件时，在楔 入过程中由于楔尖位置被轴向拉伸而发生壁厚减薄， · 1711 ·