(1. 江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江212013；2. 東北大學(xué) 材料與冶金學(xué)院，沈陽 110004；
3.南京航空航天大學(xué) 機電工程學(xué)院，南京 210016；4. 寶雞市博信金屬材料有限公司，寶雞721013)
摘 要: 利用數(shù)控實驗機床和摩擦實驗研究AZ31鎂合金板料數(shù)控?zé)釢u進成形時的摩擦和潤滑機理。結(jié)果表明：鎂合金薄板在加熱條件下可以實現(xiàn)單點漸進成形；固體潤滑膜可分為粘結(jié)型和吸附陶瓷型兩種；固體石墨和MoS2潤滑劑的初始摩擦因數(shù)均小于0.12，均可保證熱漸進成形件獲得良好的內(nèi)外表面質(zhì)量，沒有任何劃痕和裂紋等缺陷；吸附多孔陶瓷型固體潤滑膜具有潤滑和自潤滑作用，固體潤滑劑顆粒大小對初始摩擦因數(shù)有一定影響；固體BN粉末沒有起到潤滑作用，不能單獨作為熱漸進成形用固體潤滑劑；當溫度小于500 ℃時，固體石墨和MoS2粉末按一定比例配置的潤滑復(fù)合噴劑的初始摩擦因數(shù)均小于為0.2，且表現(xiàn)出一定的協(xié)同作用。
關(guān)鍵字: 鎂合金；熱漸進成形；固體潤滑劑；摩擦因數(shù)
（1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
3. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
4. Baoji Boxin Metal Materials Co., Ltd., Baoji 721013, China）
Abstract:The friction and lubrication mechanism of AZ31 magnesium alloy sheets in numerically controlled hot incremental forming were investigated by numerically controlled machine tools and friction tests. The results show that the single point incremental forming (SPIF) of magnesium alloy sheets can be achieved by heating. The solid lubricant film can be divided into two types, bonded and adsorbed ceramic coatings. The initial friction coefficients of graphite and MoS2 solid lubricant are both less than 0.12, which can ensure to obtain good inner and outer surface of hot incremental forming parts, without any defects such as scratches or cracks. The adsorbed porous ceramic solid lubricant film works as both lubrication and self-lubrication. The size of solid lubricant particles has an influence on the initial friction coefficient. The solid BN powder does not play the role of lubrication. As a result it can not be employed alone as a solid lubricant in hot incremental forming. When the temperature is lower than 500 ℃, the initial friction coefficient of the composite sprays mixed with solid graphite and MoS2 powders by a certain proportion is less than 0.2, exhibiting a synergistic effect.
Key words: magnesium alloy; hot incremental forming; solid lubricant; friction coefficient
