一、镶硬合金片鑽头的制造: (一)材料选擇: (1)鋼料选擇: 合金鑽头毛胚最初用的是低碳和中碳鋼材,使用时發現在刀槽的兩壁扭裂或槽低凹陷而引起脫片,同时發現鑽头的錐孔漲大。研究原因是由於鋼料本身强度不够,因此將鋼材改用45鎳鉻鋼,使用效果很好,但錐孔尚会涨大,后來加以淬火处理伸逗辖痄摰募? First, the manufacture of hard alloy drill bits: (A) material selection: (1) steel options: Alloy drill hair is the initial use of low carbon and carbon steel, found in the use of two Wall cracks or depression depression caused by delamination, and found that drill cone hole up. The reason is due to the strength of the steel itself is not enough, so the switch to 45 nickel-chromium steel steel, the use of good results, but the hole will still rise, and later be quenched  extension of tectonic 痄 摰 raised?