英国钢铁公司特种钢分部大量生产图1所示类型的车轮,其辐板上有安装制动圆盘所需的许多不同的穿孔,每个孔要钻、铰,并在孔端倒棱。目前用一台对置式转塔的大型专用钻床钻孔,每小时可加工20个车轮,而以前用常规方法一天才加工10个车轮。提高生产效率的主要因素是采用新钻床可使 The Special Steel Division of the British Iron and Steel Company produces a large number of wheels of the type shown in FIG. 1 with a number of different perforations required for mounting the brake disc on the web, each of which is drilled, hinged and chamfered at the end of the hole. Currently drilling a large dedicated drilling machine with an opposed turret can process up to 20 wheels per hour, up from 10 wheels a day previously using conventional methods. The main factor in improving productivity is the ability to use new drilling machines