劃線平板(ban)主要用(yong)(yong)于機械、機床制造(zao)、電(dian)子、電(dian)力(li)等20多種行業，其中以重工(gong)業使用(yong)(yong)為普(pu)遍，占總產量的95。

　　大連劃線平(ping)(ping)臺平(ping)(ping)面度分為A ， ，B級三個等(deng)級。

　　1.A :其平(ping)面度(μm)= 1+1.6D2 (D為平(ping)臺(tai)對角線長或直徑),用(yong)于高度之測定之用(yong), 常用(yong)于實驗室。

　　2. :其平面度(du)為A 之(zhi)(zhi)兩(liang)倍誤(wu)差(cha),常用(yong)于工具檢(jian)(jian)驗室作量具之(zhi)(zhi)檢(jian)(jian)驗之(zhi)(zhi)用(yong)。

　　3. B級:其平(ping)面(mian)度(du)為(wei)A 之四倍(bei)誤差(cha),常(chang)用于工(gong)具檢驗(yan)室或(huo)在現場檢驗(yan)量具或(huo)劃線(xian)之用。

　　劃線平(ping)臺的生(sheng)產(chan)工藝流程(cheng)：

　　一、劃線平臺毛(mao)坯(pi)(pi)：按技術要求制圖(tu)紙(zhi)、按圖(tu)紙(zhi)制作模(mo)型(xing)(xing)、配(pei)料、造(zao)型(xing)(xing)、烘干(gan)、澆(jiao)鑄(zhu)(zhu)、落(luo)沙(sha)、清理、檢驗毛(mao)坯(pi)(pi)的(de)各部位;熱處理毛(mao)坯(pi)(pi)，時(shi)效處理，其目(mu)的(de)是(shi)降低鑄(zhu)(zhu)件(jian)內部的(de)應力，防止機(ji)械加工后的(de)變(bian)形。

　　二(er)、劃線平臺機械加(jia)工：外觀檢(jian)驗(yan)并劃線、加(jia)工、檢(jian)驗(yan);

　　三、劃線平臺(tai)工件調平、人工刮研、檢(jian)驗科檢(jian)驗;

　　四、劃線(xian)平臺的外觀處理、噴漆、包(bao)裝、入庫。

　　劃線平臺(tai)的承載(zai)要(yao)求(qiu)：劃線平臺(tai)的承載(zai)是(shi)指鑄(zhu)鐵(tie)平板單(dan)位(wei)面積承受的重量后，劃線平臺(tai)的變形撓度(du)。為(wei)了便于理解，我們可以看作(zuo)鑄(zhu)鐵(tie)平板放好工(gong)件后，在不(bu)影(ying)響(xiang)正常使用(yong)的情況下，鑄(zhu)鐵(tie)平板所能(neng)夠承受的壓(ya)力(li)。

　　鑄鐵劃(hua)(hua)(hua)線(xian)(xian)平臺的生產過程中會出現一些產品缺(que)(que)陷(xian)(xian)(xian)，只要采用正(zheng)確的方法(fa)可(ke)(ke)以進(jin)行工(gong)藝彌補，劃(hua)(hua)(hua)線(xian)(xian)平板(ban)工(gong)作面的缺(que)(que)陷(xian)(xian)(xian)是不可(ke)(ke)以忽視的重(zhong)要部位，劃(hua)(hua)(hua)線(xian)(xian)平板(ban)主要的缺(que)(que)陷(xian)(xian)(xian)包括：氣孔(kong)(kong)、沙(sha)孔(kong)(kong)、夾沙(sha)、縮松等。劃(hua)(hua)(hua)線(xian)(xian)平板(ban)的缺(que)(que)陷(xian)(xian)(xian)在(zai)《中華(hua)人民共和國機械(xie)行業標準(zhun)》/T 7974—2000里有處(chu)理的詳細規定。劃(hua)(hua)(hua)線(xian)(xian)平板(ban)使用壽命和缺(que)(que)陷(xian)(xian)(xian) 有密切的關系。所以對劃(hua)(hua)(hua)線(xian)(xian)平板(ban)的缺(que)(que)陷(xian)(xian)(xian)做 時要嚴(yan)格按(an)工(gong)藝要求處(chu)理。

　　(1)平(ping)面劃線平(ping)板即在工(gong)件的一個平(ping)面上劃線后即能明確表示加工(gong)界限，它與平(ping)面作圖法類似。

　　(2)立體(ti)劃(hua)(hua)線(xian)(xian)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)是(shi)(shi)(shi)平(ping)(ping)(ping)面(mian)(mian)劃(hua)(hua)線(xian)(xian)的復合，是(shi)(shi)(shi)在(zai)工(gong)(gong)(gong)件的幾個相(xiang)互成不同角(jiao)度的表面(mian)(mian)(通常(chang)是(shi)(shi)(shi)相(xiang)互垂直的表面(mian)(mian))上都劃(hua)(hua)線(xian)(xian)，即(ji)在(zai)長、寬、高三個方(fang)向(xiang)上劃(hua)(hua)線(xian)(xian)。劃(hua)(hua)線(xian)(xian)的工(gong)(gong)(gong)具(ju)(ju)及其用(yong)法按用(yong)途不同劃(hua)(hua)線(xian)(xian)工(gong)(gong)(gong)具(ju)(ju)分為基(ji)(ji)準(zhun)工(gong)(gong)(gong)具(ju)(ju)、支承(cheng)裝(zhuang)夾工(gong)(gong)(gong)具(ju)(ju)、直接繪(hui)劃(hua)(hua)工(gong)(gong)(gong)具(ju)(ju)和搖擺儀量(liang)具(ju)(ju)等。基(ji)(ji)準(zhun)工(gong)(gong)(gong)具(ju)(ju)劃(hua)(hua)線(xian)(xian)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)劃(hua)(hua)線(xian)(xian)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)由鑄鐵制成，基(ji)(ji)個平(ping)(ping)(ping)面(mian)(mian)是(shi)(shi)(shi)劃(hua)(hua)線(xian)(xian)的基(ji)(ji)準(zhun)平(ping)(ping)(ping)面(mian)(mian)，要(yao)求非常(chang)平(ping)(ping)(ping)直和光潔。使(shi)用(yong)時要(yao)注意(yi)安(an)放時要(yao)平(ping)(ping)(ping)穩牢固、上平(ping)(ping)(ping)面(mian)(mian)應保持水平(ping)(ping)(ping);劃(hua)(hua)線(xian)(xian)平(ping)(ping)(ping)板(ban)(ban)(ban)(ban)不準(zhun)碰(peng)撞(zhuang)和用(yong)錘敲擊(ji)，以免使(shi)其精(jing)度降低;長期不用(yong)時，應涂油防銹，并加蓋(gai)保護(hu)罩。