冷挤压精加工技术在燃油喷嘴微孔加工中的应用

Application of Cold Extrusion Finishing Technology in Micropore Machining of Fuel Nozzle

微孔是燃油喷嘴中控制流量的关键特征,孔的圆度、孔口棱边以及孔壁的表面质量等均对喷嘴流量性能有较大影响。针对微小节流孔加工尺寸精度低、易形成锥度、孔壁光洁度低、孔口易破损、加工效率低等加工问题,在常规孔加工技术的基础上,提出了冷挤压加工工艺,采用了新设计的挤压刀和夹具,可显著提高制孔精度和质量,并形成新的加工流线。结果表明:燃油喷嘴油柱喷射顺直无飞溅,稳定性显著提高,流量公差明显缩小,同时也提高了生产效率。

Micropore is the key feature to control the flow in the fuel nozzle.The roundness,edge and surface quality of the hole wall all have a great influence on the fuel flow of the nozzle.Aiming at the processing problems of low dimensional accuracy,taper,low hole wall finish,orifice damage and low processing efficiency of micro orifice processing,based on the conventional hole processing technology,the cold extrusion processing technology is proposed,and the newly designed extrusion knife and fixture are adopted,which can significantly improve the hole making accuracy and quality,and form a new streamline.The results show that the fuel jet is straight without splash,the stability is significantly improved,the flow tolerance is significantly reduced,and the production efficiency is also improved.