Design of Composite Force Sensor for High-precision Electric Drilling Machine
GU Jingfei
CHEN Xingqiang
Abstract：To achieve automatic adjustment of the speed and feed rate of the electric drill and provide accurate and effective feedback judgment parameters for the motor control system.A sensor is installed between the drive shaft of the electric drill and the drill bit to provide real-time feedback to the control mechanism on the torque and resistance along the axis of the drill bit.The rotation axis of the sensor is also an elastic body,and its strain is approximately linearly related to torque and axial resistance,as determined through mechanical calculations.The finite element method was used to analyze the strain distribution,mutual influence between torque and resistance,and ultimate deformation of the elastic body.Experiments were conducted to derive the decoupling matrix of the sensor.The sensitivity of the torque signal of the sensor can reach 2.6 mV/V,with a comprehensive measurement error of≤0.5%.The sensitivity of the resistance signal can reach 2.2 mV/V,with a comprehensive measurement error of≤2%.The sensor,when installed on the electric drill,which can provides real-time feedback on torque and resistance to the control mechanism,enabling the electric drill to adjust the speed and feed rate more accurately and promptly.
Keywords：force sensitive sensortorque measurementresistance measurementfinite element analysisdecoupling matrix
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 26-34 )