Experimental study on the damage law of the shape of the tool nose by the times and duration of micro-discharge

The micro-discharge tool setting method is to apply a certain voltage between the tool and the tool set. When the distance between the tool and the tool set is less than the discharge gap, the medium between the tool and the tool set discharges and the voltage decreases, monitoring the voltage signal and recording the machine coordinates when the voltage changes times to complete the tool setting process. In this paper, the influence of the times and duration of the discharge on the tool clearance and the shape of the tool nose during the micro-discharge tool setting process is studied. The research shows that the tool clearance is related to the discharge duration. When the duration of the discharge is less than 4s, the tool clearance becomes smaller with the increase of the times of tool setting process, and the governing tool nose damage is breakage by the discharge current impact. When the discharge duration is greater than or equal to 4s, the tool clearance becomes larger as the number of times of tool setting process increases. The burr that grows at the nose of the tool changes the nose shape. The above research provides support for the subsequent micro-discharge tool setting tool to achieve high-precision non-destructive tool setting process and optimize tool setting parameters.