求翻译：零件在成型过程中，由于刀具（滚轮）工艺圆角过小，使得在槽根部应力集中，造成零件在耐久试验中出现断裂。是什么意思？

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Spare parts, because in the molding process tooling (roller) process Yuen Kok was too small to make the trough the roots of stress concentration, resulting in endurance test parts in fracture occurs.

Components in formation process, because the cutting tool (hoop) the craft fillet excessively is small, causes in the trough root stress concentration, creates the components to appear the break in the endurance test.

Part in the process of forming, as the tool (rollers) process corners too small so that slot root stress concentration, resulting in parts breakage in the endurance test.