鉆(zhan)(zhan)(zhan)(zhan)頭(tou)是用以(yi)在(zai)實(shi)體材(cai)料上(shang)鉆(zhan)(zhan)(zhan)(zhan)削(xue)出通孔(kong)(kong)(kong)或盲(mang)孔(kong)(kong)(kong),并(bing)能對已有(you)的孔(kong)(kong)(kong)擴孔(kong)(kong)(kong)的刀具(ju)。常用的鉆(zhan)(zhan)(zhan)(zhan)頭(tou)主要(yao)有(you)麻(ma)花鉆(zhan)(zhan)(zhan)(zhan)、扁鉆(zhan)(zhan)(zhan)(zhan)、中心鉆(zhan)(zhan)(zhan)(zhan)、深孔(kong)(kong)(kong)鉆(zhan)(zhan)(zhan)(zhan)和(he)套料鉆(zhan)(zhan)(zhan)(zhan)。擴孔(kong)(kong)(kong)鉆(zhan)(zhan)(zhan)(zhan)和(he)锪鉆(zhan)(zhan)(zhan)(zhan)雖(sui)不(bu)能在(zai)實(shi)體材(cai)料上(shang)鉆(zhan)(zhan)(zhan)(zhan)孔(kong)(kong)(kong),但習(xi)慣(guan)上(shang)也將它們歸入鉆(zhan)(zhan)(zhan)(zhan)頭(tou)一類。
7、鉆頭(tou)鉆削(xue)時,破碎(sui)或突然停止(zhi)的現象,可(ke)能(neng)是進刀(dao)太快(kuai),磨(mo)利或鉆孔(kong)時急(ji)冷急(ji)熱之原(yuan)故(gu)。
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