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Article
Study The Effect of Process Parameters of CNC Milling Surface Generation Using Al-alloy 7024

Authors: Nareen Hafidh Obaeed --- Mostafa Adel Abdullah --- Momena Muath --- Maryam Adnan --- et al.
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2019 Volume: 12 Issue: 3 Pages: 103-112
Publisher: Diyala University جامعة ديالى

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Abstract

A wonderful unique research developments inmodeling surface roughness and optimization of thepredominant parameters to get a surface finish of desiredlevel since only suitable selection of cutting parameterscan get a better surface finish, so the objective of thiswork is to study the milling process parameters whichinclude tool diameter, feed rate, spindle speed, and depthof cut resulting in optimal values of the surface roughnessduring machining AL-alloy 7024. The machiningoperation implemented on XK7124 3-axis CNC millingmachine. The effects of the selected parameters on thechosen characteristics have been accomplished usingTaguchi’s parameter design approach. The parametersconsidered are – depth of cut with two levels (0.2, 0.5mm), tool diameter with two levels (6, 8 mm), spindlespeed with two levels (1000, 2500 rpm), and finally feedrate with two levels (200, 500 mm/min). Analysis of theresults showed that the optimal settings for low values ofsurface roughness are large tool diameter (8 mm), highspindle speed (2500 r.p.m), low feed rate (200 mm/min)and high depth of cut (0.5 mm). Response Table for meanof surface roughness showed that tool diameter has themost effected factors (rank one) followed by feed rate(rank two) then depth of cut which is the third effectedfactors and finally spindle speed with the less effectedfactors of surface roughness (rank four).


Article
Finite Element Analysis of Suppression the Vibration of Dish Using Closed Loop Control System

Author: Nahedh Mahmood Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 8 Part (A) Engineering Pages: 1499-1513
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A closed loop simulation is used for minimizing of undemanding vibration caused in the dish system. The finite element method is used to model the closed loop control via ANSYS- APDL. In this paper the Bezier function for surface modeling to get the best modeling points for dish is used. A designed surface is represented by sufficient control points, using these control points, the surface has been represented depending on Bezier technique to generate reliable and near-optimal dish surface. The required equations are generated to apply the surfaces and curves efficiently using MATLAP program, then exported to ANSYS to perform closed loop vibration analysis. It can be concluded that the closed loop control system with gain (Kp=4, Ki=1, Kd=0.1) suppression the vibration of the dish with 98% with different thickness and materials of dish. Also the natural frequencies and the mode shapes of the dish is evaluated. Three materials (pure copper, pure aluminum and steel) each with different thickness is taken for the dish (0.8, 0.9, 1, 1.1 and 1.2) mm and for each thickness the responses and the natural frequencies are determined for six modes. The effect of the thickness’s variation on natural frequencies for each material was studied. It can be observed that natural frequency is direct proportional with the thickness of the dish.

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