Thermal Distribution of Temperature Rise for 18V Cordless Impact Drill

Cordless impact drill is used today by industry professionals to drive big screws, tighten and loosen bolts with high speed. High temperature is one of the sources failures of this tool and the development of thermal design methodologies for cordless impact drills still is not renowned. The aims of this project are to determine the temperature profile of selected components, to produce simulation work on temperature profile and to determine the most suitable method of temperature measurement of cordless drill temperature rise test. After acquiring the necessary tools and materials, metal bolting test is done using thermocouples and data logger, and then repeated using different material (Jelutong wood) and different temperature measurement method (Infrared thermo graphic camera). The test results are validated by a simulation of the thermal transient for the tool housing using ANSYS by means of Finite-Element Analysis (FEA). As the results, temperature profiles for selected components were drawn showing that metal bolting process generated more heat than that of wood bolting. The gearbox was the hottest part of the tool (130ºC), followed by the motor (116ºC). Thermocouple and data logger assembly was proven well suited for components‟ temperature measurement than that of thermo graphic imaging. Nevertheless the latter is accurate for surface temperature measurement and useful for simulation validation. This project successfully proposed a general approach to modeling temperature rise phenomena in cordless impact drill, and demonstrated the thermal transient across the tool housing.