By simulation of the tractor in straightoil pipe with obstacle, discussed the working situation of components and the relation between drag force and the force need to cross obstacle.
Horizontal double sided NC combined drilling machine is specially designed for the machining of main shaft journal hole and crank arm journal straightoil hole of crankshaft with six cylinders.
针对加工六缸曲轴主轴颈孔、连杆颈直油孔的需要而设计的卧式双面多工位数控钻削组机。
3
The Energy Department said this week that petroleum demand has grown for four straight weeks, resulting in unexpected drops in the nation's oil and gasoline supplies last week.