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New Developments in Non‐destructive Testing for Quality Assurance in Component Manufacturing
Author(s) -
Bernard M.,
Scheer Ch.,
Böhm V.,
Reimche W.,
Bach Fr.W.
Publication year - 2009
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.2374/sri09sp144
Subject(s) - forging , component (thermodynamics) , quality assurance , nozzle , case hardening , hardening (computing) , reliability (semiconductor) , mechanical engineering , materials science , process (computing) , service life , structural engineering , reliability engineering , engineering , hardness , computer science , metallurgy , composite material , power (physics) , operations management , physics , external quality assessment , layer (electronics) , quantum mechanics , thermodynamics , operating system
Within the scope of the research centre (CRC 489) “Process chain for manufacturing precision forged high performance components”, highly loaded functional surfaces such as gear teeth and bearing seats of gearwheels, gear shafts and crankshafts are quenched from the forging heat using newly developed water‐air spray cooling in a computer controlled nozzle array. Here, the water‐air flow is time‐controlled so that the desired surface properties such as hardness value and depth are obtained. However, hardening cracks due to the quenching process or microstructural changes must in any event be avoided since these lead to crack growth and component failure subject to loading. The aim of the sub‐project “Non‐destructive component testing” is to develop a new innovative non‐destructive testing method for monitoring the process and for quality assurance in the process chain of precision forging. This comprises non‐destructively characterising the material properties for determining the hardness parameters in the bearing and gear‐tooth regions following heat treatment and hardfinishing as well as rapidly testing for defects in functional surfaces. Within the framework of a structural reliability test, the component properties are assessed using the newly developed techniques for the early detection of failures, their localisation and the failure diagnosis by accurately monitoring the development of damage as well as estimating the residual service life.