Saturday, August 11, 2007

擴孔和鉸孔的比較?www.tool-tool.com

Bewise Inc. www.tool-tool.com Reference source from the internet.

铰孔同样增加了一定的孔径,但是铰孔的作用在于使孔的精度与光洁度垂直度达到生产要求
扩孔,也是一种生产工艺,扩孔的作用在于,在一个点钻孔,如果直接钻比较大的孔径的时候,用相应的钻头往往不能达到要求,因此先用较小的钻头来钻孔,逐步扩至规定尺寸,尽量提高孔的形位公差。
两者的精度来讲,铰孔要高很多,



扩孔:可适当增加孔的直径
铰孔:使得孔壁光滑

扩孔属于粗加工范畴,通常应用在镗孔和绞孔之前。用麻花钻或扩孔钻来加工,扩孔的余量较大。他可以准确的定心,提高了基准孔的精度,并且减少刀具的磨损,提高了生产效率。
铰孔属于精加工,用铰刀来进行。在事先钻出的留有余量的底孔中铰去薄薄的一层余量,提高了孔的精度和表面粗糙度。

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