Structure optimization of a micro drill bit with nonlinear constraints considering the effects of eccentricity, gyroscopic moments, lateral and torsional vibrations

Danh Tuyen Nguyen, Tien Dat Hoang, An-Chen Lee

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

A micro drill structure was optimized to give minimum lateral displacement at its drill tip, which plays an extremely important role on the quality of drilled holes. A drilling system includes a spindle, chuck and micro drill bit, which are modeled as rotating Timoshenko beam elements considering axial drilling force, torque, gyroscopic moments, eccentricity and bearing reaction force. Based on our previous work, the lateral vibration at the drill tip is evaluated. It is treated as an objective function in the optimization problem. Design variables are diameter and lengths of cylindrical and conical parts of the micro drill, along with nonlinear constraints on its mass and mass center location. Results showed that the lateral vibration was reduced by 15.83 % at a cutting speed of 70000 rpm as compared to that for a commercial UNION drill. Among the design variables, we found that the length of the conical part connecting to the drill shank plays the most important factor on the lateral vibration during cutting process.

Original languageEnglish
Article number012029
JournalIOP Conference Series: Materials Science and Engineering
Volume241
Issue number1
DOIs
StatePublished - 1 Nov 2017
Event2017 5th Asia Conference on Mechanical and Materials Engineering, ACMME 2017 - Tokyo, Japan
Duration: 9 Jun 201711 Jun 2017

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