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一、填空题（30分） 1、活塞环的作用有:___; ___;___;___; ___。 2、铸铁活塞环金相组织中___ ___是润滑剂,它掉去后形 成之空洞又能______。 3、目前国内普遍采用______ 铸铁作为活塞环的材质、主要加入___ 、___、___、___、 ___、等元素。 4、扭曲环在装配使用时,内倒角环倒角应向 ___,外倒角环,倒角应向______。 5、JB2264—78灰铸铁金相标准中规定石墨的分布形状有___、___、___、 ___、___、___等六种。二、是非题（对打“√”,不对打“×”）（30分） 1、平环的主要作用是密封,油环的主要作用 是控制机油。（__） 2、球铁活塞环的机械强度高主要是通过基体改变得到的。（__） 3、锥面环上行时易于在缸壁滑动面上形成油 膜,下行时有效地刮油。（__）
First, fill in the blank title (30 points) 1, the role of the piston ring are: ___; ___; ___; ___; ___. 2, cast iron piston ring in the microstructure ___ ___ is a lubricant, it formed after the void can ______. 3, the current domestic widespread ______ cast iron as a piston ring material, mainly joined ___, ___, ___, ___, ___, and other elements. 4, twisted ring assembly used, the inner chamfer ring chamfer should ___, outer chamfer ring, chamfer should ______. 5, JB2264-78 gray castings Metallographic standards provided for the distribution of graphite shape ___, ___, ___, ___, ___, ___ and other six. Second, the non-question (playing “√”, not playing “×”) (30 points) 1, the main role of flat ring seal, the main role of the oil ring is to control the oil. (__) 2, ductile iron ring mechanical strength is mainly obtained through the matrix changes. (__) 3, the cone surface of the slippery line when the cylinder wall is easy to form a film, the effective oil scraping down. (__)