基于声音信号的冷挤压内螺纹加工状态研究

摘要

Different forming conditions of in-ternal threads formed by cold extrusion are studied SO as to apply basis for the online monitoring ofcold extrusion pro-cessing.The experiment result shows that the lathe sound signal changes greatly in different forming conditions.While screw tap is uniform abrasion,the frequency of lathe sound lies mainly in the rage from 300Hz to 1000Hz,which keeps steady.During its severe abrasion,the signal power and its dominant frequency distribution have ap-parent changes.The lathe sound signal power declines in the start of tap machining process,and then intends to be stable.The lathe sound signal power reveals a general trend of increase along with the serious abrasion of screw tap.Meanwhile,high frequency power is riding for the to-tal power of lathe sound.%基于声音信号对冷挤压内螺纹加工状态进行研究,为内螺纹冷挤压成形过程在线监测提供依据.试验分析结果表明:冷挤压内螺纹加工状态不同,成形过程中机床声音信号变化较为剧烈；丝锥处于均匀磨损状态时,机床声音信号频率主要分布在300～1000Hz之间,且主频分布稳定；丝锥处于严重磨损状态时,机床声音信号能量及主频分布变化均较为明显.成形过程机床声音信号能量在初始阶段有一个下降过程,并随之趋向平稳；但随着丝锥磨损量的进一步增大,机床声音信号能量呈现逐渐上升趋势；且随着丝锥磨损的加剧,机床声音信号中高频部分能量占总能量的比例将越来越高.