半(ban)(ban)(ban)球(qiu)(qiu)形(xing)(xing)(xing)封(feng)頭(tou) 殼(ke)體軸(zhou)向截(jie)面(mian)(mian)為半(ban)(ban)(ban)圓(yuan)形(xing)(xing)(xing)。直徑(jing)(jing)較(jiao)小(xiao)的(de)(de)(de)半(ban)(ban)(ban)球(qiu)(qiu)形(xing)(xing)(xing)封(feng)頭(tou)可(ke)整(zheng)體壓(ya)制成型，但直徑(jing)(jing)較(jiao)大的(de)(de)(de)由于其深(shen)度較(jiao)大，整(zheng)體壓(ya)制有困難，故需采用數塊大小(xiao)相(xiang)(xiang)同的(de)(de)(de)梯形(xing)(xing)(xing)球(qiu)(qiu)瓣和頂(ding)部中(zhong)心的(de)(de)(de)一塊圓(yuan)形(xing)(xing)(xing)球(qiu)(qiu)面(mian)(mian)板(ban)(球(qiu)(qiu)冠)組焊而成，其結構見圖。半(ban)(ban)(ban)球(qiu)(qiu)形(xing)(xing)(xing)封(feng)頭(tou)與其他形(xing)(xing)(xing)式封(feng)頭(tou)相(xiang)(xiang)比較(jiao)，在直徑(jing)(jing)和承壓(ya)相(xiang)(xiang)同的(de)(de)(de)條件下(xia)，所需厚(hou)度小(xiao)，封(feng)頭(tou)容(rong)(rong)積相(xiang)(xiang)同時其表面(mian)(mian)積小(xiao)，用料省。受(shou)力(li)很均勻。但由于制造困難，一般除用于壓(ya)力(li)較(jiao)高、直徑(jing)(jing)較(jiao)大的(de)(de)(de)壓(ya)力(li)容(rong)(rong)器外，其他容(rong)(rong)器較(jiao)少采用。
