As for the type L5710C and L5720C upward internal broaching machine,the working direction is upward from underside elimiating the impact and quake induced by the downward broaching force and downward force of cargo chute and cutters to improve the processing quality.Since the working direction is upward from underside,the working surface is rather low not being necessary to make the silo.The machine is suitable for the broaching holes with various geometric shapes(i.e.gear spline hole,gear tri-slot.etc.),it is also suitable for the largescable production and batch production because of the high production efficiency.The machine is driven by hydraulic pressure with stable working performance,stepless speed regulation and overloading safety device.The machine has the automatic cycle system,which the main operation can be inched individually.Meanwhile,the machine is controlled by the general button station with convenient operation.