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7吨重的工件在机加工作业中是不易装卸的,当用手工操作的摇臂钻床加工立置的柴油机机体两端的深孔时,装卸尤为困难,而且在装卸工件中要花费大量的生产时间。可是,现在这一作业已为卧式加工中心所改变,夹紧得到了简化,工件的装卸成了整个机加工作业的一小部分。此外,即使工件的装卸仍插于机加工循环之中,由于具有床身移动式机床,在用吊车将第一个工件两端位置吊转过来时,床身可移至第二个工件。这一改变的结果,使美国通用汽车公司电气动力分部的拉格伦季工厂在制造8、12、16和18缸柴油机机体时,几乎节省
The 7-tonne workpieces are not easy to load and unload in the machining operations. Handling and unloading are particularly difficult when handling deep holes at either end of a diesel engine body with a hand-operated rocker drill and require a significant amount of production time to load and unload workpieces . However, this operation has now been changed for horizontal machining centers, clamping has been simplified, and workpiece handling has become a small part of the overall machining operation. In addition, the bed can be moved to the second workpiece even when the workpiece is loaded and unloaded in the machining cycle due to having a bed-moving machine, when the crane is used to suspend both ends of the first workpiece. As a result of this change, the Raglanchit plant of General Electric Company’s Electrics Division in the manufacture of 8, 12, 16 and 18 cylinder diesel engine body, saving almost