8364

7745

كارشناسي ارشد

ساخت و توليد

اصفهان، دانشگاه صنعتي اصفهان، دانشكده مكانيك

1392

پانزده، 157ص:مصور، جدول، نمودار

ص.ع.به: فارسي و انگليسي

عليرضا فدايي تهراني، عباس قائي

14/10/92

محمدرضا فروزان، محمد دانش

مهندسي مكانيك

ID7745

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

138 Experimental Study and Finite Element Simulation of Induction Heating Process for Cylindrical and Rectangular Prismatic Parts Mehrdad Tavoosi m tavoosiyangabadi@me iut ac ir Date of Submission 2013 09 22 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Alireza Fadaei Tehrani mcjaft@cc iut ac irSupervisor Dr Abbas Ghaei ghaei@cc iut ac irAbstract Induction heating is a non contact method of heating for electric conductive parts that can absorbenergy from an alternating magnetic field The magnetic field is usually created through a coil surroundingthe workpiece The alternating magnetic field induces eddy currents in the part which are dissipated intoheat This heating method because of its speed accuracy and control capability is very useful formanufacturing industries and also has high efficiency compared to other methods Induction heating is used for melting hardening heat treatment and welding metal parts In this thesis the induction heating process was simulated using ANSYS commercial finite element package To ensurethe accuracy of the results of computer simulations some experimental tests were conducted for a fewparts Thus an induction hardening machine with a power of 55 kW and a frequency of 66 kHz wasused In order to heat up the parts a number of copper induction coils were built and connected to theinduction hardening machine A thermography camera was used to measure the surface temperature and obtain the heat distribution ofworkpiece Thermography camera used was able to continuously measure the temperature from zero to1500 degrees Celsius A comparison between the simulation and experimental results revealed that the twosets of results are in good agreement The effects of various process parameters on the distribution of workpiece temperature were also studied These parameters include the coil cross section the coil workpiece gap workpiece hole The resultsshowed that the cross section of induction coil had a considerable effect on the efficiency of the inductionheating process According to the results assuming a uniform gap distance rectangular and triangularshaped induction coils had the highest thermal efficiency and circular shaped induction coil which iscommonly used in the industry had the lowest thermal efficiency One of the main causes of non uniform heating of cylindrical part is due to the presence of holes According to the results a large amount of heat is generated around the hole as the hole diameter increases Also by decreasing the distance between the hole and the workpiece edge a more heat is generated in thepart Keywords Induction heating induction hardened induction coil magnetic flux concentrator ANSYS software

عليرضا فدايي تهراني، عباس قائي

محمدرضا فروزان، محمد دانش