Deep hole straightness error has a strong impact on the performance of high pressure common rail injector .In order to research the influence of different processing parameters on the deep hole straightness,a single factor experiment of the hole in the injector body was carried out by gun-drill,and the straightness was measured by the line structured optical vision measurement technology and the least square method,then the influence of cutting speed,feeding speed and cutting fluid pressure on the straightness of the injector body was analyzed .The results showed that the straightness decreased first and then increased with the increase of cutting speed,when the cutting speed was 6 200 r／min,the straightness was minimum .When the feed speed was small,the straightness was small,as a whole,the straightness fluctuated upward with the in-crease of feeding speed .When the cutting fluid pressure was small,the straightness was large, and the straightness decreased with the increase of cutting fluid pressure .After the cutting fluid pressure value reached 8 M Pa,the straightness increased with the increase of cutting fluid pres-sure.Based on three factors and three levels of the orthogonal test,the range analysis and vari-ance analysis were done to the test results,and the best processing parameter combination com- posed of the cutting speed of 6 200 r／min,feeding speed of 50 mm／min and oil pressure of 8 MPa was obtained,then the best parameter combination was verified by experiment .The research re-sults have important reference value for reducing the straightness of the deep hole machining,im-proving the quality of the injector body and the stability of the injection performance of the sys-tem .%深孔直线度误差严重影响着高压共轨喷油器体的性能.为研究不同的加工工艺参数对喷油器体深孔直线度的影响规律,根据单因素试验方法,利用枪钻对喷油器体深孔进行加工试验,采用线结构光视觉测量技术与最小二乘法测量深孔直线度,分析切削速度、进给速度和切削液压力对喷油器体深孔直线度的影响规律.结果表明:随着切削速度的增大,直线度先减小后增大,当切削速度为6 200 r／min时,直线度最小;当进给速度较小时,直线度较小,随着进给速度的增大,直线度总体呈现波动上升的趋势;当切削液压力较低时,直线度较大,直线度随着切削液压力的增大而减小,当切削液压力值达到8 M Pa后,直线度随切削液压力的增大而增大.基于三因素三水平的正交试验,对试验结果进行极差和方差分析,获得最佳加工工艺参数组合:切削速度为 6 200 r／min 、进给速度为50 mm／min 、切削液压力为8 MPa,并对该参数组合进行试验验证.研究结果对减小深孔加工直线度,提高喷油器体加工质量和系统喷油性能的稳定性具有重要的参考价值.
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