Abstract: Based on the experimental research on the fin formation mechanism by ploughing-extrusion machining‚the formation characteristics‚machining conditions and formation mechanism of the3D integra- l fin of stainless steel were investigated．The experimental results show that the influence on the fin formation attributes to such factors as tool ge-ometry parameter‚ploughing-extrusion depth‚feed‚ploughing-extrusion velocity and the superposition angle of the secondary ploughing-extrusion．The reasonable values of matching parameters obtained by experiments are：the inclination angle of the ploughing face‚10°～35°；the extrusion angle‚10°～25°；the ploughing-extrusion velocity‚5～10m／min；and the feed‚0．4～0．8mm．

Key words:  ploughing-extrusion, 3D integra- l fin, fin machining, stainless steel