早期鑽孔的工序 1打中心孔 2鑽孔 3倒角
免中心鑽頭出現後工序 1钻孔 2倒角 大幅減低加工時間.
但是中心點不穩,(如附件一,資料出處NACHI目錄)
易造成鑽頭壽命不穩定.
鑽頭接觸工件時,刀具廠商均建議減速.
但減速時不穩,加速時钻頭易損壞(加速到0.3mm/rev 不夠專業的建議).真是兩難.
因此歐美加工業者,有恢復打中心孔的趨勢.
尤其鑽頂角 135-140度的鎢鋼钻頭,採用142度的中心鑽
鑽頭接觸工件瞬間,中心點穩定,可全速前進.
附件一
99616 中心钻的迷思
早期鑽孔的工序 1打中心孔 2鑽孔 3倒角
免中心鑽頭出現後工序 1钻孔 2倒角 大幅減低加工時間.
但是中心點不穩,(如附件一,資料出處NACHI目錄)
易造成鑽頭壽命不穩定.
鑽頭接觸工件時,刀具廠商均建議減速.
但減速時不穩,加速時钻頭易損壞(加速到0.3mm/rev 不夠專業的建議).真是兩難.
因此歐美加工業者,有恢復打中心孔的趨勢.
尤其鑽頂角 135-140度的鎢鋼钻頭,採用142度的中心鑽
鑽頭接觸工件瞬間,中心點穩定,可全速前進.
附件一
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