·752· 工程科学学报，第39卷，第5期 360 330 40 10mm 380 270 -.-8mm 240 ◆-10mm 12 mm 320 210 0 60120180240300360 300 60120180240300360 角度/) 角度9 300 (c) 280 8 mm 。-10mm 260 +12mm 240 220 2000 60120180240300360 角度/) 图8不同送进量下不同变形阶段残余应力分布曲线.(a)减径段：(b)壁厚压下段：()精整段 Fig.8 Residual stress curves with different feed ranges in different deformation stages:(a)reducing segment;(b)wall thickness reduction seg- ment;(c)finishing segment (aj 32.0 -4一8mm b 。10mm 5 24.2mm 一8mm (cj 19.04m -一8mm -。一10mm ◆一10mm 31.5 12mm 24.00mu d一12mm 19.03mm 12 mm 23.75mm 2 50 902 12 12 11 10 10 10 图9不同送进量下不同变形阶段半径分布曲线.(a)减径段：(b)壁厚压下段：(c)精整段 Fig.9 Radius value curves with different feed ranges in different deformation stages:(a)reducing segment;(b)wall thickness reduction segment; (c)finishing segment (a 一4一8mm 6.0 一垂一8mm b (c) 一。一8mm ◆-10mm 。一10mm 一10mm 一12mm -一12m 一12mm 2 12 11 10 10 10 图10不同送进量下不同变形阶段壁厚分布曲线.(a)减径段：(b)壁厚压下段：()精整段 Fig.10 Wall thickness value curves with different feed ranges in different deformation stages:(a)reducing segment;(b)wall thickness reduction segment;(c)finishing segment工程科学学报,第 39 卷,第 5 期 图 8 不同送进量下不同变形阶段残余应力分布曲线 郾 (a) 减径段; (b) 壁厚压下段; (c) 精整段 Fig. 8 Residual stress curves with different feed ranges in different deformation stages: ( a) reducing segment; ( b) wall thickness reduction seg鄄 ment; (c) finishing segment 图 9 不同送进量下不同变形阶段半径分布曲线 郾 (a) 减径段; (b) 壁厚压下段; (c) 精整段 Fig. 9 Radius value curves with different feed ranges in different deformation stages: (a) reducing segment; (b) wall thickness reduction segment; (c) finishing segment 图 10 不同送进量下不同变形阶段壁厚分布曲线 郾 (a) 减径段; (b) 壁厚压下段; (c) 精整段 Fig. 10 Wall thickness value curves with different feed ranges in different deformation stages: (a) reducing segment; (b) wall thickness reduction segment; (c) finishing segment ·752·