Abstract
In industrial area, drilling is one of the most commonly used machining operations. Today, conventional drilling methods have found their limits in deep hole drilling. To be able to push these limits, we have developed a new technology: vibratory drilling. The aim of this study is to determine the influence of the twist drill geometry on performance of the self vibratory drilling head. For that reason, it is necessary to identify the geometrical properties which have the strongest influence on axial vibrations of twist drill and on chip fragmentation. Moreover, we have also validated the experimental results by a simulator which can predict the behaviour of the self vibratory drilling head by taking into account geometrical defects of the tool.
Highlights
The use of drilling in the automotive and aerospace industries increased more in more in the last 20 years
The main purpose of this study is to find an answer to the question: “What is the influence of the tool geometry on self vibratory drilling?” To answer this question, we have realized drills with different geometrical properties
As we have identified the clearance angle as the parameter which has the biggest influence on self-vibratory drilling head (SVDH) behavior, we vary this angle
Summary
The use of drilling in the automotive and aerospace industries increased more in more in the last 20 years. El Sonbaty et al [1] observed that more than 10 000 holes are necessary while machining an aircraft engine. In order to meet industrial demand, it is necessary to develop new techniques which can be more productive [2]. Hocheng and Tsao [6] worked on five drill geometries to determine the influence of the cutting force during machining of composite materials. All these works have showed that it is necessary to choose a tool geometry which is well suited to the operation, in order to have control on following parameters:
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