In this article a novel design of a load cell for the measurement of highly dynamic forces generated during high-frequency percussive drilling is presented. It allows for a high-volume accurate measurement of low-amplitude and high-frequency (ultrasonic) dynamic forces while retaining high mechanical stiffness. The load cell consists of three piezotransducers mounted between the base and the top disc. To achieve a required level of signal synchronization between the signals from individual transducers, the piezotransducers are appropriately preloaded. The paper discusses the design procedure, instrumentation set-up and sample experimental measurements.
WiercigrochM.NeilsonR. D.PlayerM. A.BarberH.Experimental study of rotary ultrasonic machining: Dynamic aspects. Mach. Vibr., 1993, 2(4), 187–197.
2.
WiercigrochM.NeilsonR. D.PlayerM. A.Material removal rate prediction for ultrasonic drilling of hard materials using impact oscillators approach. Phys. Lett. A, 1999, 259(2), 91–96.
3.
KahramanS.Rotary and percussive drilling prediction using regression analysis. Int. J. Rock Mechanics and Min. Sci., 1999, 36, 981–989.
4.
BerziP.BeccuR.LundbergB.Identification of a percussive drill rod joint from its response to stress wave loading. Int. J. Impact Engng, 1996, 18(3), 281–290.
5.
MarkovA. I.UstinovI. D.A study of the ultrasonic diamond drilling of non-metallic materials. Ind. Diamond Rev., March 1972, 97–99.
CartmellM. P.Theoretical foundation for a design brief expansion system. J. Engng Des., 1993, 4(3), 221–248.
9.
CartmellM. P.Design brief expansion: Process validation issues. J. Engng, 1995, 5(1), 17–29.
10.
WiercigrochM.NeilsonR. D.PlayerM. A.Load cell for dynamic measurement of cutting forces generated during ultrasonic drilling and milling of hard materials. Proc. Instn Mech. Engrs, Part E, Journal of Process Mechanical Engineering, 1998, 212(E4), 263–270.
11.
LucasM.GrahamG.SmithA. C.Enhanced vibration control of an ultrasonic cutting process. Ultrasonics, 1996, 34(2-5), 205–211.
12.
LucasM.SmithA. C.Redesign of ultrasonic block horns for improved vibration performance. J. Vibr. and Acoust., 1997, 119(3), 410–414.
13.
RoarkR. J.YoungW. C.Formulas for Stress and Strain, 1976 (McGraw-Hill, Tokyo).
14.
MeirovitchL.Principles and Techniques of Vibrations, 1997 (Prentice-Hall, Englewood Cliffs, New Jersey).
15.
BarberH.PlayerM. A.Ultrasonic milling machine. UK Pat. Application 8710439, 1987.
