Manufacturing Technology Today

P. Nanda Kumar ¹, G. Ranga Janardhana ²

Affiliations
1 Sri Vekateswara College of Engg & Technology, RVS Nagar, Tirupati Rd., Chittoor, AP, IN
2 Dept. of Mech. Engg., Jawaharlal Nehru Technological University, Kakinada, IN

Abstract

Surface roughness plays on important role in manufacturing and the product quality depends on the surface roughness. The present work focuses on developing a multiple regression model with intercepts for the prediction of surface roughness of Titanium alloys machined on CNC milling machine. The working parameters, viz. speed, feed and depth of cut and surface roughness as response are considered in this model. The experiments were conducted based on factorial design using Design of Experiments (DOE). The prediction models are developed using Multiple regression techniques with and with out interaction terms of both Linear and Non Linear. The values of surface roughness predicted by this model are then verified with additional experimental results. Experimental results and regression analysis demonstrate that the model developed in this work predicts the surface roughness values with good accuracy.

Keywords

Surface Roughness, Titanium Alloy, Design of Experiments, Linear and Exponential Regression Analysis, Percentage Deviation.

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M. Bala Chennaiah ¹, P. Nanda Kumar ², G. Ranga Janardhana ³, N. Mohan Rao ³, D. Hema ⁴

Affiliations
1 Mech. Engg., Dept., V R Siddhartha Engineering College, Vijayawada, IN
2 Narayanadri Institute of Science and Technology, Rajampet, Kadapa, IN
3 JNTU, College of Engg., Kakinada, IN
4 Sree Potti Sriramulu Chalavadi Mallikarjun Rao College of Engg. & Technology, Vijayawada, IN

Abstract

Finite Element Analysis (FEA) has become a practical method of predicting stresses and deflection for loaded structures. EEA accurately identifies the load path, which can he difficult using Classical Analysis with complex structures. EEA shell element models are effective for predicting loads in weldments fabricated from plate, sheets, structural shapes and tube. The formulation used for a finite element shell model is that of full penetration welds at every joint. Here a method to derive the loads at weld joint from stress results of FEA shell element model is presented. Apart from these loads, twisting moments is also introduced and twisting load is calculated. Hence the total effect of all these loads is considered. The weld loads, weld throat size requirements are calculated using classical methods. The FEA arid Classical method results are compared and the importance of FEA is justified.

Keywords

Weld Load, Weld Throat, Finite Element Analysis, Shell Element Model, Classical Analysis.

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