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Vibration Analysis of Tool, Tool Holder and Spindle Interface
, M.Sc. Thesis Sharif University of Technology ; Ahmadian, Mohammad Taghi (Supervisor) ; Movahhedy, Mohammad Reza (Supervisor)
Abstract
Investigation stability of chatter vibration is of great importance in machining processes. Finding frequency response function (FRF) at the tool tip is an effective method to predict stable machining regions. Commonly, the tool tip FRF is obtained using experimental modal analysis but this approach is often time consuming and requires expertise. In addition, changing tool or holder requires modal test which is a disadvantage, consequently modeling methods are of interest for researchers. Moreover, optimum design of machine tool is another benefit of modeling method. Also, in machining with flexible or micro tools in which experimental tests can not be performed, modeling methods would be...
Design and Prototyping of an Ultra High Speed Air Micro Spindle
,
M.Sc. Thesis
Sharif University of Technology
;
Movahhedi, Mohammad Reza
(Supervisor)
Abstract
Today, the need for high-speed machine tools, in areas such as defense, medical and electronic for producing parts with millimeter dimensions, and with features smaller than the millimeter, increased. To meet this need, the machine tool can be used with smaller dimensions and with high speed. These machines are able to produce these parts with high production rates.The project aims to improve technical design and construction of a micro spindle to achieve sustained speed about one hundred thousand RPM. In this project, the first step in understanding the fundamentals of the theory and the system components, and the whole operation was performed. The design is based on studies carried out in...
Design and Prototyping a High Speed 60 kW Spindle Incorporated Air Turbine
, M.Sc. Thesis Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
Regarding the price of industrial turbo machines, testing the rotating elements of them is always an important issue. One of the companies of the aviation industry decided to design and fabricate a spin tester device to check the quality of new rotating parts before installing them on gas turbines. A team has worked on this project for more than a one year. The present thesis is on designing the drive system of the spin tester. The drive system was chosen to be an air motor. This thesis concentrates on the design procedure of this air motor. The designed system is capable of providing enough power to accelerate the disks to the test speed in the appropriate time. The disk geometry, test...
Design, Manufacturing and Control of High Speed Spindle Resistant to Speed Fluctuations and Sudden Mass Unbalance
, M.Sc. Thesis Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
Industrial rotating parts experiencing high angular velocities must be examined for structural integrity and strength before being installed in an operating machine. This includes performing non-destructive tests such as rotating at high speeds that generate near yield stresses in part critical points. The dangers associated with performing such tests require that these tests be performed in devices named “Spin Testers”. In this device the test is normally carried out in vacuum and within armored walls. A critical component of the spin tester is the spindle to which the rotating part is attached. Besides carrying weight of the test piece and rotating at high speeds, the spindle must be...