Development and testing of a wireless smart toolholder with multi-sensor fusion

Abstract

The smart toolholder is the core component in the development of intelligent and precise manufacturing. It enables in situ monitoring of cutting data and machining accuracy evolution and has become a focal point in academic research and industrial applications. However, current table and rotational dynamometers for milling force, vibration, and temperature testing suffer from cumbersome installation and provide only a single acquisition signal, which limits their use in laboratory settings. In this study, we propose a wireless smart toolholder with multi-sensor fusion for simultaneous sensing of milling force, vibration, and temperature signals. We select force, vibration, and temperature sensors suitable for smart toolholder fusion to adapt to the cutting environment. Thereafter, structural design, circular runout, dynamic balancing, static stiffness, and dynamic inherent frequency tests are conducted to assess its dynamic and static performance. Finally, the smart toolholder is tested for accuracy and repeatability in terms of force, vibration, and temperature. Experimental results demonstrate that the smart toolholder accurately captures machining data with a relative deviation of less than 1.5% compared with existing force gauges and provides high repeatability of milling temperature and vibration signals. Therefore, it is a smart solution for machining condition monitoring.

Key words： wireless smart toolholder; multi-sensor fusion; circular runout; dynamic balancing; static stiffness; dynamic inherent frequency

Nomenclature

Ax, Ay, Az	Average values of milling vibration in the x-, y-, and z-direction, respectively
E_{F_x}, E_{F_y}, E_{F_{\mathit{\text{z}}}}	Force measurement errors in the x-, y-, and z-direction, respectively
E_{T_x}, E_{T_y}, E_{T_{\mathit{\text{z}}}}	Torque measurement errors in the x-, y-, and z-direction, respectively
fs	Design frequency of the smart toolholder
Fhf	Free mode force
Fhwx, Fhwy	Working mode forces in the x- and y-direction, respectively
Fp	Perpendicular force
Fr	Radial force
Fv	Velocity force
Fx, Fy, Fz	Forces in the x-, y-, and z-direction, respectively
\overline{F_{imax}}, \overline{F_{imin}}	Maximum and minimum milling force average values among the three measured datasets, respectively
\overline{F_{\text{k}x}}, \overline{F_{\text{k}y}}, \overline{F_{\text{k}\mathit{\text{z}}}}	Kistler’s average values of 100000 consecutive force data points in the x-, y-, and z-direction, respectively
\overline{F_{\mathit{\text{z}}}}	Smart toolholder’s average value of 100000 consecutive force data points in the z-direction
Ktx, Kty, Ktz	Torque stiffness indexes in the x-, y-, and z-direction, respectively
Kx, Ky, Kz	Stiffness indexes in the x-, y-, and z-direction, respectively
L	Distance from the tip of the tool to the reference center of the force sensor
\overline{M_x}, \overline{M_y}	Smart toolholder’s average values of 100000 consecutive bending moment data points in the x- and y-direction, respectively
n	Spindle speed
p	Number of sampling points of per cutting tooth
R	Tool radius
Tmax, Tmin	Milling temperatures during machining
Tx, Ty, Tz	Torques in the x-, y-, and z-direction, respectively
vf	Feed speed
z	Number of cutting teeth
αe	Radial cut width
αp	Axial cutting depth
{\epsilon }_i	Measurement bending moment and force error
\delta	Measurement vibration error
\eta	Temperature difference
{\mu }_x, {\mu }_y, {\mu }_{\mathit{\text{z}}}	Percentage errors in the x-, y- and z-direction, respectively
θ	Angle between Fr and the x-axis

Acknowledgements

This work was supported by the National Key R&D Program of China (Grant No. 2022YFB3206700), the Fundamental Research Funds for the Central Universities, China (Grant No. 2022CDJKYJH060), and the Graduate Research and Innovation Foundation of Chongqing, China (Grant No. CYB23017).

Conflict of Interest

The authors declare that they have no conflict of interest.

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