在(zai)塑(su)(su)性成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)中，工(gong)具與工(gong)件都回轉(zhuan)或其中一方回轉(zhuan)用(yong)于成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)零(ling)件或零(ling)件毛坯的(de)塑(su)(su)性加工(gong)方法(fa)稱(cheng)之為回轉(zhuan)塑(su)(su)性成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)。回轉(zhuan)塑(su)(su)性成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)屬于連續局部成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)，其顯著(zhu)優點是(shi)變形(xing)(xing)(xing)載荷(he)小(xiao)，可(ke)在(zai)小(xiao)設(she)備上成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)大工(gong)件。同時回轉(zhuan)塑(su)(su)性成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)具有節材節能，節省投資(zi)，成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)精度高，具有可(ke)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)傳統工(gong)藝無法(fa)成(cheng)(cheng)(cheng)(cheng)形(xing)(xing)(xing)的(de)工(gong)件的(de)優點。
回轉塑性成形工藝可分為：
根據回(hui)轉(zhuan)塑(su)性成(cheng)(cheng)(cheng)形(xing)過程中(zhong)工(gong)(gong)件與工(gong)(gong)具的(de)運動方式(shi)及其相互關系，可將(jiang)回(hui)轉(zhuan)塑(su)性成(cheng)(cheng)(cheng)形(xing)工(gong)(gong)藝分(fen)類：依據成(cheng)(cheng)(cheng)形(xing)原料(liao)為板料(liao)或非板料(liao)，可分(fen)為板料(liao)回(hui)轉(zhuan)成(cheng)(cheng)(cheng)形(xing)與體積(ji)回(hui)轉(zhuan)成(cheng)(cheng)(cheng)形(xing)。其中(zhong)體積(ji)回(hui)轉(zhuan)成(cheng)(cheng)(cheng)形(xing)鍛(duan)造(zao)工(gong)(gong)藝是重點，它又可細分(fen)為輥鍛(duan)、斜軋(ya)、楔橫(heng)軋(ya)、仿形(xing)斜軋(ya)、輾環、齒(chi)輪(lun)(lun)橫(heng)軋(ya)、錐齒(chi)輪(lun)(lun)軋(ya)制、徑(jing)向鍛(duan)造(zao)、擺(bai)動輾壓、旋轉(zhuan)鍛(duan)造(zao)，以及近年(nian)來開(kai)發的(de)新工(gong)(gong)藝——軸向進給(gei)橫(heng)軋(ya)與實心盤輾壓。
回轉成形的特點是：
1、變形載荷小，只有整體變形載荷的0.2%～10％。
2、設備重量輕，體積小，價格便宜。
3、近于靜壓變形，沖擊振動小，對廠房無特殊要求，廠房造價低。
4、產生的噪聲小，有利于改善勞動條件，實現文明生產。
5、易于實現機械化與自動化，勞動強度低。
6、可以成形其他工藝無法或難于成形的工件。擺輾可以成形0.2mm 的圓片；輾環可以成形直徑10m、高6m 的反應堆加強環；旋壓可以成形直徑5m的封頭；輥彎可以成形重型汽車車廂板。
7、產品精度高，冷擺輾精度可達0.02mm，冷精輾環可達0.05mm。
8、易于(yu)控制變形和變形量。
回(hui)轉成(cheng)形(xing)(xing)工(gong)(gong)藝(yi)廣泛用(yong)(yong)于(yu)精(jing)密鍛(duan)件成(cheng)形(xing)(xing)與復雜鍛(duan)件模鍛(duan)制(zhi)坯(pi)，也適(shi)用(yong)(yong)于(yu)生(sheng)產大(da)型(xing)特(te)殊(shu)鍛(duan)件的(de)成(cheng)形(xing)(xing)。特(te)別是(shi)由于(yu)回(hui)轉成(cheng)形(xing)(xing)工(gong)(gong)藝(yi)可以用(yong)(yong)較小設備成(cheng)形(xing)(xing)較大(da)工(gong)(gong)件，節省投資降低生(sheng)產成(cheng)本(ben)。發(fa)展這種成(cheng)形(xing)(xing)工(gong)(gong)藝(yi)，將加快我國塑(su)性(xing)加工(gong)(gong)行業技術改造升級，同時發(fa)展回(hui)轉塑(su)性(xing)成(cheng)形(xing)(xing)工(gong)(gong)藝(yi)還(huan)可以提高產品(pin)質量及增(zeng)強(qiang)市場競(jing)爭(zheng)力(li)。