发动机燃油喷射系统挺柱体的冷挤压成形加工技术研究

针对挺柱体零件的结构特点和16MnCr5钢的工艺特性,对原来的热挤压生产工艺进行了改进研究;开发出坯料的软化退火、正反复合冷挤压成形的新工艺,设计了简单、实用、可靠的模具结构.冷挤压成形加工的挺柱体坯件具有内孔尺寸精度高、尺寸一致性好以及内孔表面光洁、无毛刺等优点,其内孔型腔不再后续机械加工就能达到挺柱体零件的使用要求.生产实践表明,该冷挤压成形工艺高效、节能、节材、生产成本低,经济效益显著.

Study on cold-extruding forming technology for the ejector-body in injector system of diesel engine

In view of the structure of ejector-body and the formability of 16MnCr5,analysis and improvement were made on the heat extruding process.A new technology of the cold combined extrusion including softening annealing was developed,and the die sets for extruding ejector-body were designed.The chief advantages by this method include the the surface quality,closer tolerances and net shape forming of inner contour for the ejector-body.It was shown by production practice that both the quality and productivity of the parts were raised,the energy consumption,raw materials and operation cost were reduced by the new technology.