目前,国内工具厂用轧扭法生产φ20～φ31.5毫米麻花钻头,工艺调整困难,废品率达5～6％,而且轧扭钻头几何精度差,钻头寿命不高。为了改变我国大、中等规格钻头生产的落后面貌,成都工具研究所与成都量具刃具厂共同合 At present, the domestic tool factory produces the φ20 ~ φ31.5 mm twist drill bit by the twist-and-twist method, and the process adjustment is difficult. The reject rate is 5-6%. Moreover, the geometric precision of the twist twist drill bit is poor and the drill bit life is not high. In order to change the backwardness of the production of large and medium-sized drill bits in our country, Chengdu Research Institute of Tools and Chengdu Measuring & Cutting Tool Factory jointly work together