EXPERIMENTAL INVESTIGATION OF VIBRATIONAL DRILLING

M Ubartas,V Ostaševičius,V Jūrėnas,R Daukševičius,S Samper

doi:10.5755/j01.mech.17.4.563

Abstract

During experimental study of vibrational drilling resonant frequencies of the developed tool were evaluated as well as drilling experiments were performed including measurements of cutting force, torque and surface quality, which indicate improvement with respect to conventional drilling and confirm that vibrational drilling can be successfully applied for process efficiency enhancement. http://dx.doi.org/10.5755/j01.mech.17.4.563

Highlights

Higher productivity and better surface quality are the prerequisites for current machining industry to be more competitive since modern manufacturing processes require shorter production time and higher precision components.Field of metal machining is closely linked to different industrial sectors including automotive, construction, aerospace, transport, medical, mechanical engineering, etc.Material treatment using cutting is still one of the predominant technological processes for manufacturing highprecision and complex components [1, 2]
This paper presents results of experimental investigation of vibrational drilling, which was carried out by using a prototype of tool holder that was developed at Kaunas University of Technology [11]
The experiments were performed with the developed vibrational drilling tool (Fig. 1) that employs piezoceramic rings implemented in the tool holder for generating ultrasonic vibrations of the drill cutting edge

Summary

Introduction

Higher productivity and better surface quality are the prerequisites for current machining industry to be more competitive since modern manufacturing processes require shorter production time and higher precision components. Cutting force and speed, feed-rate, temperature in the contact zone are those key variables that significantly influence surface quality and tool life [3, 4]. Control of these parameters affects the entire manufacturing process. Surface quality can be improved to such an extent that it may enable complete turning, milling, boring and other cutting processes; (b) according to estimations the waste constitutes about 10% of all the material produced by machining industry [7]. In works [8, 9] it was reported that vibrational turning and milling processes are more effective with respect to traditional methods and the resulting surface quality of the workpiece is markedly improved. It is demonstrated that control of tool vibration mode through application of appropriate excitation frequency enables to maximize the degree of reduction of surface roughness as well as axial cutting force and torque

Experimental setup

Testing procedure

Analysis of results

Conclusions

Findings

Summary