论文部分内容阅读
一、前言柴油机燃油喷射装置中针阀偶件是柴油机的关键部件,被称为柴油机的心脏,提高针阀偶件的使用寿命和可靠性一直是我国目前基础零部件的攻关项目之一。只有通过“失效分析——反馈”循环才能使其寿命和可靠性进一步提高。6110型柴油机所配用的长体多孔式喷油嘴中的针阀体(以下简称1号阀体)、6V150型柴油机所配用的短体多孔式喷油嘴针阀体(以下简称2号阀体)和8165型柴油机所配用长体多孔式喷油嘴针阀体(以下简称3号阀体)均用合金结构钢18Cr2Ni4WA制造,在装机试验中多次发生断裂,其中以1号阀体最为严重。断裂部位
First, the foreword Diesel fuel injection device needle valve is a key component of diesel engine, known as the heart of the diesel engine to improve the service life and reliability of the needle valve has been China’s basic components of one of the key projects. Only through the “failure analysis - feedback” cycle to its life expectancy and reliability to further improve. 6110-type diesel engine equipped with a long body porous nozzle in the needle valve body (hereinafter referred to as the No. 1 valve body), 6V150 diesel engine equipped with a short body porous nozzle needle body (hereinafter referred to as 2 Valve body) and 8165 diesel engine equipped with a long body porous nozzle needle body (hereinafter referred to as the valve body No. 3) are made of alloy steel 18Cr2Ni4WA manufacturing, in the installed test several times fracture, in which valve 1 The most serious body. Fracture site