The objective of Laser Processing Machine Tools for Engine Connecting Rod Fracture Splitting Notch (the laser notching machine) is to cut notch in the inner surface of big-end hole of connecting rod at high speed and with high precision. In programming NC of this laser notching machine

in order to avoid the overcut as well as the remains resulted because of the importing of M function

this thesis put forward a look-ahead means to deal with the acceleration/deceleration of this laser notching machine. In addition

this thesis presents the new NC processing program by combining the result with the former program. Finally

fracture split the connecting rod after the laser cut the notch. Check the result with specific tool and it shows that the right and left parts of the splitting notch are symmetrical in the depths(the difference between the depths of the two sides is ±0.025mm) for all types of connecting rods. What’s more

there is no deviation of the center

the overcut or remains. This illustrates that this means greatly improves the stability and precision of the laser notching machine.