【摘要】 金属板材在塑性加工中不可避免产生摩擦。利用声发射技术检测塑性加工的摩擦状况。以SPCC钢在单向拉伸与相对运动速度为100mm/min、正压力为7.5 kg的动态摩擦过程产生的声发射信号为研究对象,采用参数关联分析方法对两种信号进行了对比分析。试验结果表明,在相同采集的条件下有①摩擦声发射幅度与拉伸声发射幅度相差不大。②幅度相同时的摩擦声发射能量值比拉伸过程产生的声发射能量值要大得多;而摩擦声发射振铃计数值却小于拉伸声发射振铃计数值。③动态摩擦过程产生的声发射信号的持续时间在从很低到8 000μs这一范围;而拉仲过程声发射信号的持续时间一般低于5 800μs,仅当出现裂纹或断裂时才出现更高的持续时间的声发射信号。更多还原

【Abstract】 It is inevitable to come into being friction in plastic working of metal plate.In order to detect the frictions of metal plastic deform by use of the acoustic emission technique,this paper studied the character of the acoustic emission produced in uniaxial tension and dynamic friction,the relative movement speed is 100mm/min,the stress is 7.5kg,of the steel SPCC.These two signals were compared and analyzed by use of the analysis method of relational parameters.The experimental results showed that(at the same detecting condition):①the differences of the amplitude of the AE signal produced by tensile and dynamic friction are tiny;②the value of energy of the AE signal produced by dynamic friction was more than the energy of the tensile test at the condition of the same amplitude,however,the ring count of the dynamic friction was less than the ring count of the tensile test;③the duration of acoustic emission signals in dynamic friction process was in the range from very low to the 8 000μs; while the duration was less than 5 800μs of acoustic emission signals in tensile process,and it was only at the time close to crack or fracture that acoustic emission signals had a higher duration.更多还原