鉆(zhan)(zhan)頭(tou)是(shi)用(yong)以在(zai)實體材料(liao)上鉆(zhan)(zhan)削出(chu)通孔(kong)(kong)或盲孔(kong)(kong),并能(neng)對已有(you)的(de)孔(kong)(kong)擴孔(kong)(kong)的(de)刀具。常用(yong)的(de)鉆(zhan)(zhan)頭(tou)主要有(you)麻花鉆(zhan)(zhan)、扁鉆(zhan)(zhan)、中(zhong)心(xin)鉆(zhan)(zhan)、深(shen)孔(kong)(kong)鉆(zhan)(zhan)和(he)套料(liao)鉆(zhan)(zhan)。擴孔(kong)(kong)鉆(zhan)(zhan)和(he)锪(huo)鉆(zhan)(zhan)雖不能(neng)在(zai)實體材料(liao)上鉆(zhan)(zhan)孔(kong)(kong),但習(xi)慣上也將它們歸入鉆(zhan)(zhan)頭(tou)一類(lei)。
7、鉆頭鉆削(xue)時,破碎或突(tu)然停止的(de)現(xian)象(xiang),可能是進刀(dao)太快(kuai),磨利或鉆孔時急冷(leng)急熱(re)之(zhi)原故(gu)。
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