旋(xuan)(xuan)(xuan)压(ya)封(feng)头(tou)利(li)用(yong)(yong)旋(xuan)(xuan)(xuan)压(ya)成(cheng)型(xing)工(gong)(gong)艺(yi)。旋(xuan)(xuan)(xuan)压(ya)可制造各种轴(zhou)(zhou)对称旋(xuan)(xuan)(xuan)转(zhuan)体零件，如扬(yang)声器、弹(dan)体、高(gao)压(ya)容器封(feng)头(tou)、铜锣；也可用(yong)(yong)于(yu)气瓶收口、筒坯成(cheng)形(xing)等。旋(xuan)(xuan)(xuan)压(ya)的(de)特点是：用(yong)(yong)很小的(de)变(bian)形(xing)力可成(cheng)形(xing)很大的(de)工(gong)(gong)件；使(shi)用(yong)(yong)设备比(bi)较(jiao)简单(dan)，中小尺寸的(de)薄(bo)板件可用(yong)(yong)普通车床(chuang)旋(xuan)(xuan)(xuan)压(ya)；模具(ju)简单(dan)，只需要一块(kuai)芯模，材质要求低。旋(xuan)(xuan)(xuan)压(ya)适用(yong)(yong)于(yu)小批(pi)生产(chan),因其只能加工(gong)(gong)旋(xuan)(xuan)(xuan)转(zhuan)体零件，局限性(xing)较(jiao)大，生产(chan)率低。旋(xuan)(xuan)(xuan)压(ya)可用(yong)(yong)专门机(ji)(ji)械，采用(yong)(yong)仿形(xing)旋(xuan)(xuan)(xuan)压(ya)和数字(zi)控制旋(xuan)(xuan)(xuan)压(ya)。在(zai)旋(xuan)(xuan)(xuan)压(ya)成(cheng)形(xing)的(de)同时(shi)使(shi)板厚减薄(bo)的(de)工(gong)(gong)艺(yi)称为变(bian)薄(bo)旋(xuan)(xuan)(xuan)压(ya)，又(you)称强力旋(xuan)(xuan)(xuan)压(ya)，多(duo)用(yong)(yong)于(yu)加工(gong)(gong)锥形(xing)件、薄(bo)壁的(de)管形(xing)件等，也可用(yong)(yong)以(yi)旋(xuan)(xuan)(xuan)压(ya)大直径的(de)深(shen)筒，再剖开后(hou)制成(cheng)平(ping)板。旋(xuan)(xuan)(xuan)压(ya)是将平(ping)板或(huo)空心坯料固(gu)定在(zai)旋(xuan)(xuan)(xuan)压(ya)机(ji)(ji)的(de)模具(ju)上，在(zai)坯料随机(ji)(ji)床(chuang)主轴(zhou)(zhou)转(zhuan)动(dong)的(de)同时(shi)，用(yong)(yong)旋(xuan)(xuan)(xuan)轮或(huo)赶棒加压(ya)于(yu)坯料，使(shi)之产(chan)生局部的(de)塑(su)性(xing)变(bian)形(xing)。