冲压工艺术语（4）
压线：强行局部排挤材料，在工程料片上面挤出一条沟槽，以利于折弯、成形确保工程料片精度的一种冲压工序。
压毛边：强行局部排挤材料，从而使工程料片冲裁毛刺去除的一种冲压工序。
抽牙：沿内孔周围将材料翻成侧立凸起的一种冲压工序
Stamping process terminology (4)
Line pressing: a stamping process in which materials are forced out locally and a groove is extruded on the engineering sheet to facilitate bending and forming to ensure the accuracy of the engineering sheet.
Burring: a stamping process in which materials are forced out locally to remove burr during blanking.
Tooth extraction: a stamping process in which the material is turned into a side vertical bulge around the inner hole
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