这些传统加工方法存在的问题有：难以克服攻丝过程中的动态载荷，导致丝锥折断、阻塞、磨损等，同时加工质量不高。
Those traditional method are confronted with several problems: having difficulty with conquering dynamic load in tapping and leading to thread breaking, block, abrasion and low machining quality.
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