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在加工硬度HRC27～33,材质为40Cr连杆螺纹底孔(φ14)时,过去采用普通麻花钻加工。效率低,产品质量差,钻头耐用度低。后采用标准群钻钻孔,钻头耐用度明显提高,钻头耐用度提高约70％,精度提高,粗糙度下降。但因连杆硬度较高,标准群钻也经常发生折断现象。为此我们对标准群钻进行修磨(见图1)。主要是在标准群钻的基础上将月牙槽圆弧刃角减小,钻尖提高,以提高钻头强度。结果钻头的耐用度比标准麻花钻提高了约一倍。
In the processing of hardness HRC27 ~ 33, the material is 40Cr connecting rod thread bottom hole (φ14), the past use of ordinary twist drill processing. Low efficiency, poor product quality, low bit durability. After the standard group of drilling holes, drill bit significantly increased durability, bit durability increased by about 70%, accuracy, roughness decreased. However, due to the higher connecting rod hardness, the standard group of diamonds often break off phenomenon. For this reason we grind the standard group drill (see Figure 1). Mainly in the standard group of drilling on the basis of the crescent moon arc edge angle decreases, the tip of the drill to improve, in order to improve bit strength. As a result, the bit is about twice as durable as a standard twist drill.