6970

6512

كارشناسي ارشد

ساخت و توليد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1390

ده، [118]ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محسن صفوي

عليرضا فدايي تهراني

5/6/91

محمدرضا فروزان، پيمان مصدق

1396/09/18

كتابنامه

مكانيك

مهندسي مكانيك

ID6512

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Design and Manufacturing a CNC Mechanism with Pneumatic Rotary Actuator for Outer Surface Finishing of Non magnetic Cylindrical Work Pieces by MAF Process Ali Kiani a kiani00@gmail com Date of Submission February 2 2012 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 8311 IranDegree M Sc Language FarsiSupervisor s Name and Email address Mohsen Safavi mosafavi@cc iut ac irAbstractDue to the rapid development of various industries requiring high precision moving toward achievement of newtechnologies in manufacturing processes is inevitable MAF is an emerging process that has achieved anacceptable place among a variety of ultra precious polishing methods through published papers in scientificgatherings In this project In addition to further understanding of this process and its benefits it was decided todesign a machine tool with ability to polish the outer surface of cylindrical pieces made of non ferromagneticmetals such as aluminum and copper This machine was made on basis of a two axis CNC milling bed whileused a pneumatic cylinder and gripper to rotate work pieces The effect of important parameters such as gapbetween tool and work piece tool rotational speed tool rotation direction changing frequency and magneticfield intensity on final surface roughness was studied A PLC and three phase inverter were used to make abilityof adjustment frequency of tool rotational direction changing The magnetic Abrasive powder was combinationof Fe powder as ferromagnetic particles SiC powder as abrasive and silicon oil unbounded powder Machineautomatic movements in x and y axis were controlled by a software controller named Mach 3 This softwareoperates like as a real controller and is capable to control different types of CNC machines Among the inputparameters tool rotational direction changing frequency is being investigated in this polishing method for thefirst time Low production cost is another important benefit of this system When the machine was made andprepared several tests were designed and performed with response surface design method using Minitabsoftware The final surface roughness was measured as the output variable in these experiments by use ofsurface roughness measuring instrument To examine the effect of magnetic field experiments were conductedin two different fields 1 A single magnetic field was generated by tool and 2 A magnetic field was generated byuse of tool and a magnet inside of work piece Also the regression equation was derivation to determine therelative influence of each input factor on the output variable The results showed that frequency factor incomparison with the others has the greatest influence on improving the quality of surface Also the minimumgap and maximum tool rotational speed values were effective for producing smooth surface In addition theincreasing intensity of the magnetic field will have a significant impact on improving work piece surface finish It caused more surface pressure on abrasive particles and pushed them on the work piece surface So thematerial removal rate and final surface quality were improved To better understanding results are alsoproposed as graphs and contour To better results present the work piece surface was imaged using accuratemicroscopes These images show surface profile in nanometer scale Key words Magnetic abrasive finishing Abrasive powder Tool rotation direction changing frequency Final surface roughness Design of experiments

محسن صفوي

عليرضا فدايي تهراني

محمدرضا فروزان، پيمان مصدق