Browse Publications Technical Papers 2009-01-0207
2009-04-20

Critical Points About Engine Valves Manufacturing 2009-01-0207

Task of a valve which is used in internal combustion engines is basically to help charge fresh air into combustion chamber and discharge mixture of fired fuel and air out of engine. Valve is one of the most critical parts in engine because they stand extreme temperatures, pressures and hitting impact. Because temperature which intake and exhaust valves stand is different from each other; different materials, structure and manufacturing methods are implemented on each valve. Manufacturing of the valves includes various methods such as forging, machining, welding, nitriding, coating etc.
This paper explains alternative engine valve manufacturing methods, critical parameters for each manufacturing stage, potential failure modes and some corrective actions which can be taken. During study, various methods which are alternative of each other to produce engine valves were tried. Advantages & disadvantages, difficulties, failure modes and best way to correct them are recorded. To understand impact of critical process parameters on valve quality such as temperature, time, layer thickness for nitriding, work rest blade slope angle and material for centerless grinding, seat angle for seat wear etc. many tested valves were inspected to find valve's surface defects under magnifier glasses and to understand valve's micro structure under microscope.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

A Low-Friction Variable-Valve-Actuation Device, Part I: Mechanism Description and Friction Measurements

970338

View Details

TECHNICAL PAPER

Variable Cam Timing (VCT) Knock Root Cause Analysis and Failure Mode Prevention

2019-01-5003

View Details

JOURNAL ARTICLE

Investigations on a Catalyst Heating Strategy by Variable Valve Train for SI Engines

2012-01-1142

View Details

X