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该钻头适宜加工球墨铸铁,并能钻削可锻铸铁及布氏硬度HB350～400、表面有硬皮、黑皮和氧化层的较硬铸铁。我厂在加工产品Φ1500×5700球磨机隔板盘时,有Φ34-50圆周等分孔,材料为球墨铸铁、牌号QT45-50,强度高、塑性大,耐磨性高。原用标准麻花钻加工,钻削时负荷重、轴向抗力大,时常发出刺耳的声音,钻头耐用度低、主切削刃很快磨损、甚至崩刃,且加工速度慢、工效低,不适宜作批量生产。用铸铁群钻加工,由于未修磨主切削刃前面和外刃双后角,以致在钻削过程中,钻头切削部分常产生黑皮现象并容易导致切削刃磨损,仍达不到理想的切削效果。后改变钻头切削参数,刃磨成专门加工球墨铸铁
The bit is suitable for processing ductile iron, and can drill malleable iron and Brinell hardness HB350 ~ 400, hard crust, black skin and oxide layer of hard cast iron. I plant in processing products Φ1500 × 5700 ball mill separator plate, there are Φ34-50 circumference equal points hole, the material is ductile iron, grade QT45-50, high strength, plasticity, high wear resistance. The original standard twist drill processing, drilling load, axial resistance, often making a harsh sound, drill low durability, the main cutting edge wear quickly, and even chipping, and the processing speed is slow, inefficient, not suitable For mass production. With cast iron group drilling, because the main cutting edge is not grinding front and outer rake double posterior, so that during the drilling process, the drill cutting part often produce black phenomenon and easily lead to cutting edge wear, still can not achieve the desired cutting effect. After changing the drill cutting parameters, grinding into a special processing ductile iron