Performance Evaluation of Valve Seat Leakage in Cylinder Head Assembly of 35 Hp Tractor

The DOE using Taguchi approach can economically satisfy the needs of problem solving and product/process design optimization project in the manufacturing industry. Design of experiments (DOE) plays a powerful role in many organization today in terms of improving process efficiency, product quality, process capability, reducing process variability, costs for poor quality such as scrap, rework and other failure costs. This paper discusses and investigates the use of Taguchi parameters design for reducing the leakage from the valve seat in cylinder head sub assembly of 35 hp Tractor. This study utilizes a standard orthogonal array for determining the optimum turning parameters with applied noise factor. The control factors includes concentricity,circularity, spring force, Ra of valve sheet, valve stem diameter, valve guide inner diameter, noise factor, filling air temperature, stem axis deviation from valve guide axis and hammer puffing by the operator. The noise factors are included to increase the robustness and applicability of this study. After running the experiments using the selected orthogonal array and other parameters, which helps us to verify the various combinations of controlled factors and a predictive equation for minimized leakage flow rate for the given set of parameters.