By E. Kuljanic (eds.)
This booklet, according to the Fourth overseas convention on complex production structures and expertise - AMST '96 goals at proposing development and updated info at the most up-to-date advancements - examine effects and business event within the box of machining procedures, optimization and strategy making plans, forming, versatile machining platforms, non traditional machining, robotics and regulate, measuring and caliber, therefore delivering a global discussion board for a important alternate of rules, and furthering a beneficial cooperation among examine and industry.
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Extra info for Advanced Manufacturing Systems and Technology
Characteristic for the turning of nickel-based alloys is a pronounced arcuate deformation of the grain boundaries against the workpiece rotation (Fig. 14). Numerous similarly arcuate slip lines occur within the individual grains due to slipping of atomic layers along specific crystallographic planes. The plastic deformation of the work material microstructure visible under the optical microscope generally extends to a depth of 10 or 20 11m from the surface. It is usually confined to grains lying directly at the surface, but may extend over several grain layers at a greater workpiece depth, depending on the severity of thermal effects in the surface zone.
Lnconel718 MPa 0~ N /::;. A Waspaloy Co - 13 ' Mo 3 4,5 5 - '·, TiAI6V4 0 100 200 300 400 500 55 Cr ..... 0. n26-15 >50 Fe '/::;. A - Ni 600 . -%) temperature Fig. 6: Chemical composition of Inconel 718 and Waspaloy and comparison of their high temperature strength with that of TiA16V 4 and high-alloyed steel In general, the nickel-based alloys belong to the group of hard-to-machine materials. Their low specific heat and thermal conductivity as compared to steels, their pronounced tendency to built-up edge formation and strain hardening and the abrasive effect of carbides and intermetallic phases result in exceptionally high mechanical and thermal stresses on the cutting edge during machining.
5 mm oversize, the finishing time on a conventional NC machine amounted to a total of 36 hours, the total manual reworking time was 70 hours, thus resulting in a total manufacturing time of 106 hours. e. a total of 54 hours. This resulted in a time reduction of almost 50 % due to the application of this new technology (Fig. II). For economic considerations it is therefore indispensable to include the production planning process as a whole. 120 ] [h] 100 106 I manual ' polishing 80 __J I manual 1 spot60 - grinding ' r - -- ---,-- 54 40 _ manual.