是第二次机械化加工，在顶端加工后，再将紧固件坯料钉端切削。
Pointing . Pointing is a secondary machining operation consisting of adding points on fastener blanks which were not pointed during the heading operation .
深小孔件属于难加工的机械零件，在工程实际中应用极广，但却很难甚至无法采用常规切削加工。
Deep eyelet belongs to hard to be processed machine parts. It is widely used in engineering and practice. But it is very difficult to be machined by traditional cutting method.
前言： 阐述各种高速切削加工刀具材料的性能，并分析其物理特性和化学特性以及不同的成分合成对机械加工性能的影响。
A description of the properties of high-speed machining tool, and its physical properties, chemical properties analysis synthesis of the said sub-machining properties.
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