对奥迪轿车零件翻孔端部直径偏小的分析结果表明，其主要原因是材料变薄及回弹所致。
The main cause of too small flanged hole end diameter on parts of the Audi car has been found by analysis to be thinning of blank material and rebound.
分析认为，由于孔壁界面滑移的软化效应，侧阻力曲线始端变为上升曲线。
Taking account of the strength softening effect of slippage, the beginning section of lateral shear curve is an ascending curve.
理论上，小型开孔切割机器人能够在任意曲面上开任意形状的孔，管端切割机器人能完成任意形状的圆管端头的切割。
In theory, the small hole-cutting machine can cut arbitrary hole on arbitrary curved surface, and the tube-end incisory robot can incise round tubes' ends of any form.
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