Tool Wear Emitted Sound Data
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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.
将PCB 130D20型麦克风固定于支架上，正对刀具刀尖以采集切削辐射噪声。该麦克风通过定制信号调理器连接至计算机，采用GoldWave软件录制采集到的声音信号，采样率设置为44100赫兹。实验在MTAB公司生产的XLTURN型车床上开展，采用硬质合金刀片与直径38mm的铝合金工件作为加工对象。实验全程维持恒定进给率0.5毫米/转。首先记录主轴转速为400转/分时的空转噪声，此时未进行任何切削加工。随后将主轴转速固定为570转/分，先针对新刀具在背吃刀量1mm的工况下录制切削噪声，再分别对后刀面磨损量0.2mm的轻微磨损刀具、后刀面磨损量0.4mm的严重磨损刀具重复上述录制流程。将每条时长12秒的声音信号拆分为12段1秒长的子信号，用于后续采用希尔伯特-黄变换（Hilbert-Huang Transform，HHT）的信号处理流程；每段1秒的子信号包含44100个采样数据点。
