Tool Wear Emitted Sound Data

A PCB 130D20 microphone is kept in a stand and facing towards the tool tip to capture the emitted sound. The microphone is connected to the computer through a specially designed signal conditioner. GoldWave software is used to record the captured sound with sampling frequency set to 44100Hz. A series of machining experiments were conducted on a Turning machine(XLTURN from MTAB) with Carbide Insert and aluminium work piece of 38mm diameter. Throughout the experiment a constant feed rate set at 0.5 mm/rotation was uniformly maintained. First, the freerunning sound for the spindle rotational speed of 400 rev/min was recorded, without the machining operation. Keeping the spindle rotational speed at 570 rev/min, the sound emitted due to machining with a fresh tool was recorded separately for the depth of cut of 1 mm. This recording process was repeated separately for slightly worn tool with 0.2mm flank wear and severely worn tool with 0.4mm flank wear]. The 12-second-long sound signal is split into 12 one second sound signals for the subsequent signal processing using HHT. Each one second signal contains 44100 sampling data.