The distortional control chart of early reliability was set up through analysis of the spindle distortional data before early failure examination,which was used to monitor spindle early reliability.

• 通过对数控机床主轴早期故障实验前采集的主轴变形数据的分析,建立了早期可靠性变形控制图,用来监控主轴早期可靠性。