蝶形(xing)封(feng)頭(tou)因為一(yi)(yi)些(xie)(xie)庫(ku)存(cun)積壓(ya)現(xian)在有些(xie)(xie)壓(ya)不(bu)住價格(ge)了。財產沖壓(ya)彎頭(tou)的(de)磨(mo)損一(yi)(yi)直是(shi)影響平安文明生產的(de)一(yi)(yi)個(ge)身分(fen)，跟著(zhu)科學手藝(yi)一(yi)(yi)直發展，質(zhi)(zhi)料(liao)也(ye)一(yi)(yi)豎立異，復(fu)合板碟形(xing)封(feng)頭(tou)，接(jie)踵(zhong)出(chu)現(xian)鑄石、鑄鋼(gang)、合金、離心澆注復(fu)合陶(tao)瓷(ci)等質(zhi)(zhi)料(liao)。其中(zhong)管道內襯氧化(hua)鋁陶(tao)瓷(ci)以其高耐(nai)磨(mo)性、高硬(ying)度、耐(nai)氧化(hua)、耐(nai)侵蝕性好和   的(de)耐(nai)盤曲(qu)溫(wen)強度機能，寧夏碟形(xing)封(feng)頭(tou)，已成(cheng)為一(yi)(yi)種應用   普遍耐(nai)磨(mo)質(zhi)(zhi)料(liao)，占(zhan)有了   特種陶(tao)瓷(ci)市(shi)場份額(耐(nai)磨(mo)質(zhi)(zhi)料(liao))的(de)80%擺布(bu)。

       碟形(xing)封頭(tou)是指由(you)(you)部分球(qiu)殼、圓弧祈邊以及(ji)良邊（圓筒短療）三(san)部分組成的(de)封頭(tou)。由(you)(you)于在球(qiu)殼與折邊、折邊與直(zhi)邊的(de)連接處(chu)曲率半徑(jing)發生突變(bian)，產生了(le)邊緣應力比(bi)內灰引起的(de)薄膜應力大得多(duo)，其力學性比(bi)較球(qiu)形(xing)和(he)橢圓形(xing)封頭(tou)差。

蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)成形(xing)(xing)(xing)(xing)(xing)后小厚度(du)要求(qiu) 根據制造(zao)工藝確定蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)的投料(liao)厚度(du)，以確保蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)的成品小厚度(du)δmin不(bu)小于設計要求(qiu)的小成形(xing)(xing)(xing)(xing)(xing)厚度(du)δmin。 蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)成形(xing)(xing)(xing)(xing)(xing)后，應檢(jian)測(ce)(ce)(ce)蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)的成品厚度(du)。具(ju)體測(ce)(ce)(ce)厚部(bu)(bu)位(wei)與數量，依蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)的形(xing)(xing)(xing)(xing)(xing)狀與規格，碟形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)定做(zuo)，可由供需雙方訂貨技(ji)術(shu)協議確定，但蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)上易發生(sheng)工藝減蔳的部(bu)(bu)位(wei)（蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)頂部(bu)(bu)和轉角過渡部(bu)(bu)位(wei)等）以及(ji)直邊部(bu)(bu)位(wei)為(wei)必測(ce)(ce)(ce)部(bu)(bu)位(wei)。 2、蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)成形(xing)(xing)(xing)(xing)(xing)前(qian)打磨的拼焊焊縫(feng)表面(mian)，碟形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)生(sheng)產廠(chang)家(jia)，在(zai)蝶(die)(die)形(xing)(xing)(xing)(xing)(xing)封(feng)(feng)頭(tou)成形(xing)(xing)(xing)(xing)(xing)后符合下列(lie)全(quan)部(bu)(bu)條件時，可低于相鄰母材表面(mian)： a)、焊縫(feng)部(bu)(bu)位(wei)實(shi)測(ce)(ce)(ce)的小厚度(du)，應符合上面(mian)條的規定； b)、焊縫(feng)表面(mian)不(bu)得(de)低于母材表面(mian)0.5mm。