(安徽工業(yè)大學(xué) 冶金與材料學(xué)院， 馬鞍山 243002)
摘 要: 目前，用于計(jì)算反向擠壓力的計(jì)算式都是根 據(jù)相應(yīng)正向擠壓時(shí)的算式，并直接令作用在擠壓筒壁上的摩擦為零得來的。實(shí)踐中發(fā)現(xiàn)，計(jì)算出的擠壓力與實(shí)測值差異較大，無法正確指導(dǎo)生產(chǎn)。造成這種差異的主要原因是忽略了正、反向擠壓時(shí)變形區(qū)中溫升及加工硬化程度不同對金屬變形抗力的影響，及采用了與正擠壓時(shí)相同的變形抗力值。通過實(shí)驗(yàn)，建立了確定反擠壓時(shí)金屬變形抗力的方法及計(jì)算式。驗(yàn)證結(jié)果表明，以此為依據(jù)計(jì)算反向擠壓力，誤差不大于5%，可以滿足工程計(jì)算要求。
關(guān)鍵字: 變形抗力；擠壓力；計(jì)算；反向擠壓
extrusion force formulas on
backward extrusion
（College of Metallurgy and Materials,
Anhui University of Technology，Maanshan 243002, China）
Abstract:At present，the extrusion force formulas used in calculating backward extrusion are all based on the according direct extrusion's，and the friction between the metals and inside of the container is assumed to become zero. In practice，the calculated extrusion force according to these formulas has much difference with the real figure frequently，which can not guide production. The main reasonis to neglect the difference of the temperature rice and strain hardening between the direct extrusion and the backward extrusion. Through the experiment，the backward extrusion force formulas were found. The error of backward extrusion force calculated by the formulas is not more than 5%，so it can be applied in engineering calculation.
Key words: deformation resistance; extrusion force; calculation; backward extrusion
