Investigation of forces in the course of the water jet--work piece interaction

Title of Thesis Investigation of Forces Developed In The Course of The Water Jet-Work Piece Interaction. Hung-Yuan Li, Master of Science In Mechanical Engineering, 1988 Thesis Directed by : Dr. E. S. Geskin Associate Proffessor Mechanical Engineering Department This study is concerned with the dynamic of the interaction between the water jet and the work-piece. The piezoelectric transducer was used to construct an experimental setup. The simultaneous use of the constructed setup and strain gage enables us to validate the experimental procedure. The forces in the impingment zone were measured at different operational conditions. Totally about 400 different combinations of these conditions were tested. It was found that the force is mainly determined by the diameter of the sapphire. The effects of the abrasive size , abrasive flow rate, the diameter of the carbide tube, and the stand-off distance were also determined. The acquired informations will be used to improve the understanding of the mechanism of the jet formation and optimize the condition of cutting. INVESTIGATION OF FORCES DEVELOPED IN THE COURSE OF THE WATER JET--WORK PIECE INTERACTION By Hung-Yuan Li Thesis submitted to to the Faculty of the Graduate School of the New Jersey Institute of Technology in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering 1988 APPROVAL SHEET Title of Thesis : Investigation of forces Developed in the course of the water jet-work piece interaction. Name of Candidate : Hung-Yuan Li p Master of Science in Mechanical Engineering May, 1988 Thesis and Abstract Approved Dr. E. S. Geskin Date Associate Proffessor Mechanical Engineering Department VITA Name: Hung-Yuan Li Address: 140, Wilson Ave., Kearny, NJ 07032 Degree to be conferred and date: M.S.M.E. May 1988 Collegiate institutions: Institution Dates Degree Date of Degree National Taipei Inst. 9/73 6/77 B.S.M.E. June, 1983 of Tech. New Jersey Inst. 1/87 5/88 M.S.M.E. May, 1988 of Tech. Position held: Teaching Assistant, Dept. of Mechanical Engineering N. J. I. T. , Jan. 87 Present ACKNOWLEDGMENT I take this opportunity to express my deepest gratitude to Dr. E.S. Geskin, Associate Professor, Mechanical Engineering Department of NJIT for his valuable guidance throughout the course of this work. TABLE OF CONTENTS Chapter I : INTRODUCTION 1 page II : OBJECTIVE 6 III : PRINCIPLE OF THE PIEZOELECTRICITY 8 IV : EXPERIMENTAL APPARATUS AND PROCEDURE 13 V : EXPERIMENTAL RESULTS 20 VI : ANALYSIS OF THE EXPERIMENTAL RESULTS 25 VII : CONCLUSION 35 APPENDIX 37 REFERENCE 124 LIST OF TABLES Table Page 5.1 Non-Abrasive Jet Force at Different Combination 21 5.2 Abrasive Jet Force at Sapphire Diameter 0.007 inch 22 5.3 Abrasive Jet Force at Sapphire Diameter 0.010 inch 23 5.4 Abrasive Jet Force at Sapphire Diameter 0.014 inch 24 6.1 Experimental Variables and Values 37 6.2 Abrasive Flow Rate 38 6.3 Effect of Process Conditions at Fixed Stand-Off Distance 39 6.4 Effect of Process Conditions at Fixed Abrasive Flow Rate 40 6.5 Effect of Process Conditions at Fixed Carbide Tube Exit Area 41 6.6 Effect of Process Conditions at Fixed Sapphire Exit Area 42