Reverse algorithm for determining the number of cutting passes and cutting conditions in axial turning

Abstract

REVERSE ALGORITHM FOR DETERMINING THE NUMBER OF CUTTING PASSES AND CUTTING CONDITIONS IN AXIAL TURNING Marina Tošić, Predrag ĆosićPreliminary notes To avoid production of low quality products and reduce unnecessary time wastage, algorithms for decision making are widely used in process planning. Usually decision of selecting cutting conditions (depth of cut, feed and cutting speed) is made by experience or using handbooks. Much effort during years was invested in finding optimizing algorithms for metal cutting processes. Algorithm given by G. Halevi does not include specific tool or machine for machining process and that is why it is called reverse algorithm. Taking in consideration boundary values of cutting conditions and their effects on surface roughness, algorithm finds maximum values of cutting conditions, giving preference to the feed rate and thus minimizing the number of cutting passes. Proposed algorithm was explained by data flow implemented in software package MATLAB and tested on the example of axial turning. The obtained results were compared to recommendations retrieved from Iscar's catalog and show that algorithm is suitable for determining appropriate number of cutting passes and cutting conditions. This paper is a contribution to the automated algorithms for decision making in process planning. Keywords: reverse algorithm, cutting conditions, axial turning Obrnuti postupak za određivanje broja prolaza i parametara obrade kod uzdužnog tokarenjaPrethodno priopćenje Kako bi se smanjila proizvodnja škarta i nepotrebno rasipanje vremena, algoritmi za donošenje odluka koriste se kod projektiranja tehnoloških procesa. Odabir parametara obrade (dubine reza, posmaka i brzine) uobičajeno se donosi na temelju iskustva ili upotrebom priručnika. Tijekom godina mnogo truda je uloženo u cilju pronalaska optimalnih algoritama za obradu metala. Algoritam koji je predložio G. Halevi ne uzima u obzir zadani alat ili stroj te se zbog toga naziva obrnutim postupkom. Uzimajući u obzir granične vrijednosti parametara obrade i njihov utjecaj na površinsku hrapavost, algoritam pronalazi maksimalne vrijednosti parametara, dajući prednost posmaku i time reducirajući broj prolaza kod obrade. Predloženi algoritam je prikazan pomoću dijagrama, implementiran u softverski paket MATLAB i testiran na primjeru uzdužnog tokarenja. Dobiveni rezultati su uspoređeni s preporukama iz Iscarovog kataloga te upućuju na to da je algoritam primjeren za određivanje broja prolaza i parametara obrade. Ovaj članak je doprinos automatiziranim algoritmima za donošenje odluka koji se koriste kod projektiranje tehnoloških procesa. Ključne riječi: obrnuti postupak, parametri obrade, uzdužno tokarenje