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   管道相貫線切割機的編程操作在多面正投影中求解相貫線屬于初學者的難點之，一般多采用表面取點法求解。
   表面取點法：當兩個回轉體中有一個表面的投影有積聚性時，可用在曲面立體表面上取點的方法作出兩立體表面上的這些共有點；這種方法稱為表面取點法。
   輔助平面法：作一組輔助平面，分別求出這些輔助平面與這兩個回轉體表面的交點，這些點就是相貫線上的點。這種方法稱為輔助平面法。為了作圖方便，一般選特殊位置平面為輔助平面。

   相貫(guan)線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)形(xing)(xing)狀(zhuang)取(qu)決(jue)于(yu)兩(liang)(liang)(liang)立(li)體(ti)的(de)(de)(de)(de)(de)(de)形(xing)(xing)狀(zhuang)、大小和(he)相對位置(zhi)。如兩(liang)(liang)(liang)空間(jian)形(xing)(xing)體(ti)的(de)(de)(de)(de)(de)(de)表(biao)面(mian)(mian)(mian)(mian)都是(shi)(shi)(shi)(shi)曲面(mian)(mian)(mian)(mian)，相貫(guan)線(xian)(xian)(xian)(xian)是(shi)(shi)(shi)(shi)一(yi)條空間(jian)曲線(xian)(xian)(xian)(xian)；兩(liang)(liang)(liang)空間(jian)形(xing)(xing)體(ti)的(de)(de)(de)(de)(de)(de)表(biao)面(mian)(mian)(mian)(mian)都是(shi)(shi)(shi)(shi)平面(mian)(mian)(mian)(mian)時，相貫(guan)線(xian)(xian)(xian)(xian)是(shi)(shi)(shi)(shi)一(yi)條空間(jian)折線(xian)(xian)(xian)(xian)；兩(liang)(liang)(liang)空間(jian)形(xing)(xing)體(ti)的(de)(de)(de)(de)(de)(de)表(biao)面(mian)(mian)(mian)(mian)分別是(shi)(shi)(shi)(shi)平面(mian)(mian)(mian)(mian)和(he)曲面(mian)(mian)(mian)(mian)時，相貫(guan)線(xian)(xian)(xian)(xian)是(shi)(shi)(shi)(shi)由幾段平面(mian)(mian)(mian)(mian)曲線(xian)(xian)(xian)(xian)圍成的(de)(de)(de)(de)(de)(de)線(xian)(xian)(xian)(xian)。在給定兩(liang)(liang)(liang)空間(jian)形(xing)(xing)體(ti)后(hou)，在多面(mian)(mian)(mian)(mian)正投(tou)影(ying)圖(tu)(tu)中可以(yi)容易地(di)畫(hua)出(chu)兩(liang)(liang)(liang)立(li)體(ti)的(de)(de)(de)(de)(de)(de)投(tou)影(ying)，但它(ta)們(men)的(de)(de)(de)(de)(de)(de)相貫(guan)線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)投(tou)影(ying)并不能(neng)直接(jie)畫(hua)出(chu)，通常采用(yong)(yong)輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)法(fa)或其他方法(fa)先求出(chu)相貫(guan)線(xian)(xian)(xian)(xian)上(shang)若干(gan)點(dian)的(de)(de)(de)(de)(de)(de)投(tou)影(ying)，然后(hou)將它(ta)們(men)連接(jie)成相貫(guan)線(xian)(xian)(xian)(xian)。輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)法(fa)是(shi)(shi)(shi)(shi)先作(zuo)出(chu)一(yi)適當的(de)(de)(de)(de)(de)(de)面(mian)(mian)(mian)(mian)，再作(zuo)出(chu)該面(mian)(mian)(mian)(mian)和(he)兩(liang)(liang)(liang)空間(jian)形(xing)(xing)體(ti)的(de)(de)(de)(de)(de)(de)交(jiao)線(xian)(xian)(xian)(xian)，最后(hou)作(zuo)出(chu)兩(liang)(liang)(liang)交(jiao)線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)交(jiao)點(dian)。所得(de)(de)交(jiao)點(dian)就是(shi)(shi)(shi)(shi)相貫(guan)線(xian)(xian)(xian)(xian)上(shang)的(de)(de)(de)(de)(de)(de)點(dian)。按此方法(fa)改變輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)的(de)(de)(de)(de)(de)(de)位置(zhi)，重復作(zuo)圖(tu)(tu)，就能(neng)得(de)(de)到足(zu)夠的(de)(de)(de)(de)(de)(de)點(dian)，將它(ta)們(men)連結成相貫(guan)線(xian)(xian)(xian)(xian)。圖(tu)(tu)中為圓(yuan)柱和(he)圓(yuan)錐臺(tai)相交(jiao)，為作(zuo)出(chu)其相貫(guan)線(xian)(xian)(xian)(xian)上(shang)的(de)(de)(de)(de)(de)(de)點(dian)，選用(yong)(yong)水平面(mian)(mian)(mian)(mian)為輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)，水平面(mian)(mian)(mian)(mian)與圓(yuan)柱、圓(yuan)錐臺(tai)的(de)(de)(de)(de)(de)(de)交(jiao)線(xian)(xian)(xian)(xian)分別是(shi)(shi)(shi)(shi)開口矩形(xing)(xing)和(he)圓(yuan)。它(ta)們(men)的(de)(de)(de)(de)(de)(de)兩(liang)(liang)(liang)個交(jiao)點(dian)是(shi)(shi)(shi)(shi)相貫(guan)線(xian)(xian)(xian)(xian)上(shang)的(de)(de)(de)(de)(de)(de)點(dian)。運用(yong)(yong)輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)法(fa)的(de)(de)(de)(de)(de)(de)關(guan)鍵在于(yu)選取(qu)合適的(de)(de)(de)(de)(de)(de)輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)，輔(fu)(fu)助(zhu)(zhu)(zhu)(zhu)面(mian)(mian)(mian)(mian)和(he)兩(liang)(liang)(liang)空間(jian)形(xing)(xing)體(ti)表(biao)面(mian)(mian)(mian)(mian)的(de)(de)(de)(de)(de)(de)交(jiao)線(xian)(xian)(xian)(xian)投(tou)影(ying)應是(shi)(shi)(shi)(shi)直線(xian)(xian)(xian)(xian)或者是(shi)(shi)(shi)(shi)圓(yuan)。作(zuo)圖(tu)(tu)中常選用(yong)(yong)平面(mian)(mian)(mian)(mian)或球

   以上就是管道相貫線切割機的(de)編程操作，如(ru)果那里不(bu)明白(bai)隨時(shi)可以(yi)咨詢。