安徽快三走势图

ZIXUNREXIAN:400-066-2698

振动时效消除应力效果参数曲线法评定

GENGXINSHIJIAN:2019/10/31  DIANJISHU:559


振动参数曲线法是用来评定振动时效设备使用后,工件残余应力消除效果如何的常用方法。振动时效设备具备量好的残余应力消除效果,但是振动频率和使用方式对最终消除应力效果影响很大,不良的振动频率或激振点选择可能无法有效消除应力,甚至可能导致工件开裂或尺寸精度变化较大。

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(a) 幅频特性曲线扫描法
    图6-1幅频特性曲线二次扫描图  (图中实线为振前所测曲线、虚线为振后所测曲线)  在振动处理过程中随着残余应力的下降,构件的内阻尼减小,所以在幅频特性曲线上所表现出的是固有频率的下降,(如图6-1中所示f1变为f1′)、共振峰值的增高、频带变窄。振动处理前测得的幅-频特性曲线和振后幅频特性曲线对比可求出各参数的变化量△f,△h和△u。经过多个试件处理后可把这些变化量的统计值确定下来。这样就可在生产应用时进行监测。

  RUGUOSHENGCHANZHONGSUODEDECANSHUBIANHUAYUQUEDINGDESHUZHIXIANGJIN,SHUOMINGZHENDONGCHULIDEXIAOGUOYIDADAO。RUGUOYUANYUANPIANXIAO,SHUOMINGXIAOGUOQIANJIA,SHANGXUZAIJIZHENCANSHU(ZHUYAOSHIJIZHENLI)SHANGZUOSHIDANGDIAOZHENG,HUOZHICHENGFANGSHISHANGXUZUODIAOZHENG。

  ZONGZHI,FU-PINTEXINGQUXIANJIANCEFASHIGUONEIWAIPUBIANCAIYONGDEJIAOWEICHENGSHUDEFANGFA。 

(b)振幅-时间曲线监测法 

    FU-PINTEXINGQUXIANSHIZHENDONGCHULIDEQIANHOUJINXINGDE,QIEPINLVZAIBUDUANDEGAIBIAN。YOUSHIWEILEHUODEGENGHAODEQUXIAN。ZHEIYAOBIQIANYIZHONGFANGFAGENGWEIJIANDAN,TAJIKEYITONGGUOZHENFUDEBIANHUALAIKONGZHIZHENDONGCHULIDEYOUXIAOSHIJIAN,YOUKEYITONGGUOZHENFUDEBIANHUALIANGLAIJIANCECANYUYINGLIDEBIANHUAQINGKUANG。