The punches of the bus bar punching shearing machines are prone to wear and need to be replaced after wear. So how to replace the punch of the bus bar punching shearing machines? The following editor briefly introduces a common replacement method. Turn on the power switch. Step on the footswitch, the unit's oil pump starts, and then step on the punching unit footswitch, the punching will move forward. During the forwarding process, release the footswitch and the punch will stop. Step on the footswitch again and the punch will continue. Moving forward, when approaching the limit switch, the punch will automatically return to the top dead center. During the process, when the punch needs to return, press the corresponding manual back button of the CNC bus machine, the punch will return and release the back button, the punch will stop moving back. Lubricate each movement part once in the afternoon and once before cutting. Use the observation holes of the upper and lower knife blocks t