如果你需要在(zai)板材(cai)上(shang)沖(chong)切(qie)大(da)量孔而(er)板材(cai)又(you)不(bu)能保(bao)持(chi)平整(zheng)，成因可(ke)能是(shi)沖(chong)壓應(ying)力累(lei)積。沖(chong)切(qie)一個(ge)孔時，孔周邊材(cai)料被向下拉伸，令板材(cai)上(shang)表(biao)面(mian)拉應(ying)力增(zeng)(zeng)(zeng)大(da)下沖(chong)運動也導致(zhi)板材(cai)下表(biao)面(mian)壓應(ying)力增(zeng)(zeng)(zeng)大(da)。對于沖(chong)少量的(de)孔，結(jie)果不(bu)明顯，但隨(sui)著沖(chong)孔數目的(de)增(zeng)(zeng)(zeng)加(jia)，拉應(ying)力和(he)壓應(ying)力也成倍增(zeng)(zeng)(zeng)加(jia)直(zhi)到令板材(cai)變形。正全科技(ji)微信(xin)內容真不(bu)錯，值(zhi)得(de)關注!!

消(xiao)除這(zhe)種(zhong)變(bian)形(xing)(xing)的(de)方法之一是：每隔一個孔(kong)(kong)沖(chong)(chong)切(qie)，然(ran)(ran)后(hou)返回沖(chong)(chong)切(qie)剩(sheng)余的(de)孔(kong)(kong)。這(zhe)雖(sui)然(ran)(ran)在板材上產生(sheng)相同的(de)應力(li)，但瓦解了因同向連(lian)續一個緊接(jie)一個地(di)沖(chong)(chong)切(qie)而產生(sheng)拉應力(li)/壓應力(li)積聚。如此也令(ling)**批(pi)孔(kong)(kong)分(fen)擔了第二批(pi)孔(kong)(kong)的(de)部變(bian)形(xing)(xing)效應。