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Minimization of Internal Rejections in Seat and End Deposit Processes of Valve


Gali Roja , Swami Ramananda thirtha institute of science and technology; Dr. P. V. Gopal Krishna, Vasavi College Of Engineering (Autonomous); Erappa, Nova College of Engineering and technology


Engine Valve, Fillet Radius and Tappet End, Engine Head, Engine Cylinder, Inlet and Exhaust Valve


The important parts of the engine valve are stem, head, fillet radius and tappet end. Out of the above the seat is critical with respect to the function of the valve, which acts as a seal in the cylinder. Engine valve is a critical component of the Internal Combustion Engine and it has to work at high temperature and act as a gate and also leak proof. Engine valve manufacturing entails a variety of operations like bar preparation, Forging, Heat treatment, Special processes, Machining and Final Inspection. Head turning, Chamfering & Facing is one of the significant operations which falls under the vicinity of Machining and in turn plays a key role in deciding the rate of production for intact manufacturing of valve. In machine shop unable to meet delivery targets due to high internal rejections missus and also we have repeated customer complaints due to chance causes. This is occurring at final inspection at our quality gate. Hence an attempt has been made to study the causes of rejections and suggest remedies for them. Studies which are contributing high entire internal rejection, founded these defects contributing Seat run out due to un full filled the material and blow holes in TIG Welding, Drilling cavity off -set, drilling depth variance, drill bit breakdown these are they lead to effect of engine efficiency. Tappet end damage in tipping process, these defects can influence the performance of the engine to a large extent. Q.C approach chosen for problem solving methodology to reduce the internal rejection. After implementing the this approach rejection rate reduce by 0.75% and cost saving Rs 3,79,080 per month.

Other Details

Paper ID: IJSRDV6I20736
Published in: Volume : 6, Issue : 2
Publication Date: 01/05/2018
Page(s): 1069-1075

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