7884079586
layers and covers, as well as processes of materiał removal processing: machining (abrasive, erosion, electrical discharge, laser, photon, ion). This field answers also questions from employees’ time management, production sources and flow of information and materials.
An example of Process Engineering applied research is the use of abrasive machining in production of thin - walled elements (microelements)1. Machining of thin - walled microproducts is very problematic. Plastic and resilient deformation of processed materiał can occur. In case of resilient deformation the machined surface bends causing i.e. vibrations. Plastic deformation can cause faults of shape of machined objects and own - tensions, very difficult to remove from object’s surface. Own - tensions and deformations of fragments of machined parts very often cause expenses in many microproduct processing operations, especially due to production faults and prolongation of production time. In example, during machining of complex mechanical units, deformations of their components can make their assembly difficult or even impossible. Own - tensions of machined elements can be caused by former machining operations of sub - product (plastic, thermo-, abrasive, coarse, etc.), but also by plastic deformation and thermo- gradients that occur during machining.
Little machining tracę dimensions in precise cutting force us to take into account at different modelling stages ‘scalę effects” and dislocation influence. In some cases the thickness of machined surface is comparable to round - off radius of cutting edge. In such a case the influence of the stagnant zonę and “microflashes” on values of components of cutting force and on deformation of machined object can be significant. Some factors that differentiate micromachining from traditional macroscale machining can be distinguished. Machining effects and product ąuality will be mainly dependent on:
• machined materiał microstructure (size and shape of grain, phase types, inclusions), cutting tool materiał and its characteristics (microtoughness, fine - grained, surface type);
• cutting blade geometry (round - off radius, advance angle);
• cutting parameters (mainly cutting speed).
Appropriate elaboration of microproduct or thin - walled object should take into account the correction of potential machining faults through:
• optimization of machining strategy;
• upgrade of cutting speed (High Speed Cutting);
• optimization of cutting parameters (feed and cutting depth) in accordance with minimization of cutting force component, perpendicular to machined surface.
Gawlik J., Zębała W.. Matras A., Kształtowanie i nadzorowanie jakości mikrowyrobów w precyzyjnej obróbce skrawaniem, referat na Szkolę Obróbki Skrawaniem, wrzesień Opole 2011
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