characteristics 1, can be lengthened for cutting range of 350mm acuities nitrogen-treated barrel, adopt double mandrel replacement production, and in processing by turns, second mandrel will first mandrel automatic feeder off placed on material, this movement and take off second mandrel removed material process not interfere with each other, can improve the efficiency greatly, an operator may also operate 2 3 sets of equipment for clients to save labor costs, and can be lengthened production nitrogen-treated barrel length, reduce the waste generated by waste, edge for customers reduce raw material cost, 2, the machine with vacuum adsorption design, make outfit take product is very convenient, the efficiency is greatly improved. 3. The machine adopts imported servo motor, the cutting precision greatly increased,