Abstract:In the process of deephole boring，with the increase of the length diameter ratio of workpiece，the vibration of the boring bar is also increasing，which leads to the common deephole boring cutter unable to meet the processing requirements of actual complex working conditions.In order to reduce the vibration of boring bars and further improve the machining accuracy of workpieces，a new boring device with support is designed after studying the characteristics of the deephole boring.Through the adjustable support，the device can play a fixing and guiding role in the machining process，so as to effectively reduce the processing vibration and improve the processing accuracy.On this basis，the static analysis of the new boring device is carried out，the dynamic modal analysis of the boring bar of the new boring device is also conducted by using ANSYS Workbench.Finally，the prototype of the device is manufactured and the performance test is completed.The results show that the static and dynamic performances of the new boring device with support are better than those of the ordinary deephole boring cutter，and the machining accuracy of the new boring device is better than that of the ordinary deephole boring cutter.