一、前言随着造船事业的发展,船舶用柴油机向高速度、大负荷的方向进展。因而对称为柴油机心脏的喷油泵中,与针阀(又称芯子)组成精密偶件、提供柴油机燃烧做功所需的雾化燃油的针阀体(又称喷嘴)的技术条件日趋增高。针阀体工作条件恶劣,承受大的机械负荷及热负荷,受到高压燃油反复 I. Introduction With the development of the shipbuilding industry, marine diesel engines have made progress toward high-speed and heavy-load operation. Thus symmetrical to the heart of the diesel injection pump, and the needle valve (also known as the core) to form a precision coupling, to provide diesel engine combustion required atomizing fuel needle body (also known as the nozzle) of the growing technical conditions. Needle body working conditions harsh, to withstand large mechanical and thermal load, high pressure fuel repeatedly