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在薄钢板上钻大孔,不宜用普通麻花钻加工。因为薄板工件刚性差、塑性大,加工时受轴向力和钻削力的下压,尤其是钻心钻出孔时,钻头横刃失去定心作用,工件产生抖动,轴向力急剧下降;走刀量瞬时减少,切削负荷加重,工件迅速回弹,使材料容易弯曲变形。由于孔径大,钻头圆弧刃和月牙槽切削面积大,钻削时会产生较大的轴向抖动,使钻心尖容易崩碎,也不宜用薄板群钻加工。如我厂加工DD振动筛主要部件筛板时,其尺寸为1250×3435毫米、厚
Drill large holes in the thin steel, not suitable for ordinary twist drill. Because of the poor rigidity of sheet metal, plasticity, processing by the axial force and the drilling force of the pressure, especially when drilling the hole center, the drill chucks lose centering effect, the workpiece jitter, the sharp decline in axial force; Cut the amount of instantaneous decrease, cutting load, the workpiece quickly rebound, so that the material is easy to bend deformation. Due to the large aperture, large cutting edge area of the circular arc and crescent, the drilling will have a greater axial jitter, so that the core tip is easy to crumble, but also not suitable for drilling with sheet metal group. If my factory processing DD shale shaker sieve, its size is 1250 × 3435 mm, thickness