鑄鐵(tie)橋型平(ping)尺有(you)什么優(you)點
使用鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)研(yan)(yan)(yan)(yan)(yan)磨(mo)(mo)鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)的(de)(de)(de)(de)時(shi)候盡可(ke)(ke)(ke)能選用橋型平(ping)(ping)(ping)(ping)尺(chi)(chi)，因為它(ta)結構牢固，不容易(yi)變形，而(er)且比較(jiao)重，拖研(yan)(yan)(yan)(yan)(yan)時(shi)能夠緊貼(tie)(tie)鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)，使接觸斑(ban)(ban)點真實可(ke)(ke)(ke)靠。且橋型平(ping)(ping)(ping)(ping)尺(chi)(chi)較(jiao)寬，與平(ping)(ping)(ping)(ping)板(ban)接觸面積(ji)大，有(you)(you)利于(yu)刮(gua)研(yan)(yan)(yan)(yan)(yan)鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)的(de)(de)(de)(de)修(xiu)理。橋型平(ping)(ping)(ping)(ping)尺(chi)(chi)選擇時(shi)盡可(ke)(ke)(ke)能選用分別比鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)的(de)(de)(de)(de)對角(jiao)線、長(chang)(chang)邊(bian)(bian)、短(duan)(duan)(duan)邊(bian)(bian)稍長(chang)(chang)一點的(de)(de)(de)(de)三把鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)，太長(chang)(chang)太短(duan)(duan)(duan)均不利于(yu)鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)的(de)(de)(de)(de)修(xiu)復(fu)，太長(chang)(chang)則(ze)會(hui)在(zai)(zai)(zai)拖研(yan)(yan)(yan)(yan)(yan)時(shi)兩頭下沉使鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)變的(de)(de)(de)(de)凸了(le)(le)，太短(duan)(duan)(duan)會(hui)使鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)重復(fu)在(zai)(zai)(zai)平(ping)(ping)(ping)(ping)板(ban)研(yan)(yan)(yan)(yan)(yan)刮(gua)而(er)使平(ping)(ping)(ping)(ping)板(ban)變成凹了(le)(le)。鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)只要能確(que)保應有(you)(you)的(de)(de)(de)(de)直線度，而(er)對外觀質量并無嚴(yan)格要求(qiu)。平(ping)(ping)(ping)(ping)板(ban)研(yan)(yan)(yan)(yan)(yan)磨(mo)(mo)時(shi)，拖研(yan)(yan)(yan)(yan)(yan)距離不宜太長(chang)(chang)，一般(ban)不_過100mm，如果(guo)(guo)選用鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)的(de)(de)(de)(de)長(chang)(chang)度明顯大于(yu)所拖研(yan)(yan)(yan)(yan)(yan)的(de)(de)(de)(de)平(ping)(ping)(ping)(ping)板(ban)截面，則(ze)拖研(yan)(yan)(yan)(yan)(yan)距離不要縮小(xiao)。研(yan)(yan)(yan)(yan)(yan)磨(mo)(mo)平(ping)(ping)(ping)(ping)板(ban)時(shi)，不應在(zai)(zai)(zai)平(ping)(ping)(ping)(ping)尺(chi)(chi)上(shang)向(xiang)平(ping)(ping)(ping)(ping)板(ban)外加壓力(li)，而(er)應以鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)自(zi)身重量緊貼(tie)(tie)鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)，在(zai)(zai)(zai)平(ping)(ping)(ping)(ping)行平(ping)(ping)(ping)(ping)板(ban)方(fang)向(xiang)上(shang)施力(li)拖拉鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)尺(chi)(chi)，以便產生真實可(ke)(ke)(ke)靠的(de)(de)(de)(de)接觸斑(ban)(ban)點。如果(guo)(guo)刮(gua)研(yan)(yan)(yan)(yan)(yan)鑄(zhu)(zhu)(zhu)(zhu)鐵(tie)平(ping)(ping)(ping)(ping)板(ban)短(duan)(duan)(duan)邊(bian)(bian)方(fang)向(xiang)直線度誤差明顯大于(yu)長(chang)(chang)邊(bian)(bian)方(fang)向(xiang)直線度，則(ze)在(zai)(zai)(zai)修(xiu)復(fu)對角(jiao)線直線后應該(gai)先修(xiu)復(fu)短(duan)(duan)(duan)邊(bian)(bian)的(de)(de)(de)(de)直線度，再修(xiu)復(fu)長(chang)(chang)邊(bian)(bian)的(de)(de)(de)(de)直線度，這樣(yang)_更為合理了(le)(le)。
