由于大直径圆钢棒料的弯曲或椭圆，用常规方法在普通车床上钻中心孔时，不仅易损坏中心钻，而且由于棒料跳动造成中心架振动，对机床精度影响较大。在轴类品种多、批量小的情况下，也不适宜购置专用的中心孔机床。针对此问题，设计制作了棒料钻中心孔专用装置，如附图所示。利 Due to the bending or oval of large-diameter round bars, it is not only easy to damage the center drills when the center hole is drilled on the ordinary lathe by the conventional method, but also the center frame vibrates due to the bouncing of the bars, which greatly affects the precision of the machine tool. In the shaft variety, small quantities, it is not suitable for the purchase of a dedicated center hole machine. In response to this problem, designed a special center hole drilling device, as shown in the figure. Lee