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链轮在热处理时畸变的评定

点击数(shu):2021-07-08 09:50:15

  链轮在热处理时畸变的评定:

  工(gong)件在(zai)淬(cui)火过程(cheng)中(zhong)体积(ji)和形(xing)状的(de)改变(bian)(bian)(bian)(bian)(bian),是由于钢中(zhong)组织转变(bian)(bian)(bian)(bian)(bian)时(shi)的(de)比(bi)体积(ji)变(bian)(bian)(bian)(bian)(bian)化所(suo)造成的(de)体积(ji)胀缩,以(yi)及(ji)热(re)处(chu)理(li)应(ying)力(li)所(suo)引起的(de)塑(su)性(xing)畸(ji)(ji)(ji)变(bian)(bian)(bian)(bian)(bian)。显然,热(re)处(chu)理(li)钢材中(zhong)相变(bian)(bian)(bian)(bian)(bian)时(shi)的(de)比(bi)体积(ji)变(bian)(bian)(bian)(bian)(bian)化必然存(cun)在(zai)。因此,热(re)处(chu)理(li)应(ying)力(li)越(yue)(yue)大(da),相变(bian)(bian)(bian)(bian)(bian)越(yue)(yue)不均匀,热(re)处(chu)理(li)畸(ji)(ji)(ji)变(bian)(bian)(bian)(bian)(bian)就(jiu)越(yue)(yue)大(da)。当热(re)处(chu)理(li)应(ying)力(li)定(ding)时(shi),如果(guo)钢的(de)塑(su)性(xing)畸(ji)(ji)(ji)变(bian)(bian)(bian)(bian)(bian)抗力(li)越(yue)(yue)大(da),则其畸(ji)(ji)(ji)变(bian)(bian)(bian)(bian)(bian)越(yue)(yue)小(xiao)(xiao)。 所(suo)以(yi),要减小(xiao)(xiao)畸(ji)(ji)(ji)变(bian)(bian)(bian)(bian)(bian),就(jiu)必须减小(xiao)(xiao)淬(cui)火应(ying)力(li)与提(ti)高钢的(de)塑(su)性(xing)抗力(li)。评(ping)定(ding)链轮淬(cui)火过程(cheng)中(zhong)的(de)畸(ji)(ji)(ji)变(bian)(bian)(bian)(bian)(bian),主要可(ke)从以(yi)下几个方(fang)面(mian)考虑(lv)。

  (1)钢(gang)的屈(qu)服(fu)强(qiang)度(du)(du)(du),钢(gang)的屈(qu)服(fu)强(qiang)度(du)(du)(du)作(zuo)为微量塑性(xing)畸(ji)变(bian)抗(kang)力指标(biao)。一般把金属材(cai)料受某种力的作(zuo)用而(er)出现有(you)一定残留塑性(xing)畸(ji)变(bian)时的抗(kang)力作(zuo)为该材(cai)料屈(qu)服(fu)强(qiang)度(du)(du)(du)。只有(you)当(dang)内应力达到或(huo)超过该材(cai)料的屈(qu)服(fu)强(qiang)度(du)(du)(du)或(huo)塑性(xing)畸(ji)变(bian)抗(kang)力时,链轮才(cai)能(neng)出现热处(chu)理畸(ji)变(bian)。决定钢(gang)材(cai)屈(qu)服(fu)强(qiang)度(du)(du)(du)大小(xiao)的主(zhu)要因(yin)素有(you)钢(gang)的化学成分、组织结构,以(yi)及钢(gang)材(cai)所处(chu)的温度(du)(du)(du)和应力状态。链轮的屈(qu)服(fu)强(qiang)度(du)(du)(du)越(yue)高,塑性(xing)畸(ji)变(bian)抗(kang)力越(yue)大,其畸(ji)变(bian)量就越(yue)小(xiao)。

  (2) 链轮内应力 工(gong)(gong)(gong)件(jian)(jian)内应力(主要包括机(ji)械加工(gong)(gong)(gong)应力和热处理应力)是促使工(gong)(gong)(gong)件(jian)(jian)发(fa)生(sheng)畸(ji)变(bian)是另(ling)一重要因素。淬(cui)火(huo)前工(gong)(gong)(gong)件(jian)(jian)内部残余应力越(yue)(yue)大,淬(cui)火(huo)后(hou)的(de)畸(ji)变(bian)越(yue)(yue)大。当内应力达(da)到或(huo)超过钢的(de)塑(su)性畸(ji)变(bian)抗力或(huo)屈服(fu)强度时,工(gong)(gong)(gong)件(jian)(jian)产生(sheng)塑(su)性畸(ji)变(bian),即造成工(gong)(gong)(gong)件(jian)(jian)尺寸和形状的(de)变(bian)化。


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