内孔车削一致性影响因素分析及实验验证

Analysis and Experimental Verification of Influencing Factors of Inner Hole Turning Consistency

在外圆与内孔一致性检测中发现,孔的连续车削尺寸散差比外圆大,而且变化趋势经常出现相反的现象,此外,内孔与外圆变化方向不一致的问题也给车床实现热补偿增加了很大的难度。为了研究缩小孔加工尺寸散差和找到内孔与外圆尺寸变化趋势趋于一致的办法,通过改变刀尖圆角、镗刀装夹形式进行工艺改进,最终在一致性上提升了40%,连续加工精度提升了30%,达到了尺寸变化趋势与外圆一致;选出了最优工艺条件来保证数控车床的加工精度及稳定性,也为后续热补偿的实现提供了技术支撑。

In the consistency detection of the outer circle and the inner hole,it is found that the divergence difference of the continuous turning size of the hole is larger than that of the outer circle,and the change trend is often opposite.In addition,the inconsistency between the change direction of the inner hole and the outer circle also increases the great difficulty of realizing thermal compensation for the lathe.The purpose of this paper is to reduce the divergence of the hole machining size and find the consistent trend of the inner hole and the outer circle of the size.To improve the process by changing the angle of the tool and the boring tool,and finally improve the consistency by 40%and the continuous machining accuracy by 30%,and the size change trend is consistent with the outer circle.This study selects the optimal process conditions to ensure the machining accuracy and stability of the CNC lathe,and also provides technical support for the realization of subsequent thermal compensation.