Abstract:Thermal analysis of dry deep hole drill was done by using ANSYS software, according to the thermal deformation problem existed in deep-hole dill system. According to the conclusion from thermal analysis, a set of device was designed which was used to reduce the temperature of dill automatically. In the device, PT100 temperature module was used to complete real time collection of data, and according to the size of temperature signal, the operational state of deep-hole drill was adjusted automatically through PLC. The function of automatically adjusting control of temperature for the deep-hole drill system and switching of manual /automatic modes were implemented. This device has good expansibility, agility, reliability and stability.