By Brian Griffiths
The 1st name within the "Manufacturing Engineering Modular" sequence, the e-book of this e-book marks attractiveness of the influence of floor end bought in manufacture ("surface integrity") at the sensible functionality of product, when it comes to such components as fatigue, corrosion and power. it's a concise paintings, meant mainly for undergraduate and postgraduate scholars, which also needs to offer worthy fabric for the pro production engineer.
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Additional resources for Manufacturing Surface Technology : Surface Integrity and Functional Performance (Manufacturing Processes Modular S.) (Manufacturing Processes Modular)
19 Schematic diagrams of the turning process A heat-affected layer will influence such things as fatigue, corrosion, stress corrosion, strength, wear and creep. In the vast majority of cases quoted in the literature, heat-affected layers have a negative influence on functional performance and it is generally considered that heat-affected layers are undesirable with respect to surface integrity. However, there are examples of what appears to be abusive machining producing a good surface integrity.
Hydrogen embrittlement is known to reduce ductility and fatigue. This has been a source of worry with respect to the ECM process but the possibility of hydrogen pick-up does not apply because the unit event is an anodic process. The workpiece is protected because, if there is any hydrogen discharge, it will occur at the tool. The manufacturing process un# event 37 There are normally no thermal effects in ECM but there can be if shorting or sparking occurs due to either contact or a build up of debris.
Such layers are termed 'white layers'. 20 Influence of turning tool burnishing land length on white layer depth (Furze and Griffiths, 1986) hardness. When specimens having a white layer of 5gm depth were used in wear tests, the wear was 28% less than when the specimens had no white layer, ie the surface integrity was improved by the white layer. In this case the machining conditions could be described as controlled abusive machining. This example of improved performance is in contrast to the example given by Metcut (1980) for abusive machining where a 5gm surface layer produced by thermal generating mechanisms reduced the fatigue life of high strength steels by 40%.