Effect of cutting parameters on the drilling of AlSi7 metallic foams

Abstract

In this study, the behaviors of Al matrix metallic foams, produced by the powder-metallurgy method, against the hole-drilling operation were examined. The stirred Al, 7 % Si and 1 % TiH2 powders were pressed in a mould under uniaxial pressure (600 MPa) and then deformed, and in this way foamable block samples were obtained. The block samples were subjected to a foaming process at 710°C. The obtained samples were drilled at different cutting speeds (10, 30, 50, 70) mm/min and feed rates (0.15, 0.225, 0.30) mm/r with drill tips of different diameters (4, 5 and 6) mm. It was observed that the foam affected the chip breakings and chip adhesions increased in proportion to the cutting speed. In the deviation from circularity, the feed rate turned out to be a more effective parameter than the cutting speed. Keywords: foams, cutting, machining, tooling V {tudiji je bilo preiskovano obna{anje kovinskih pen na osnovi Al, izdelanih po metodi metalurgije prahov, pri vrtanju luknje. Me{anica Al, 7 % Si in 1 % TiH2 prahov je bila stisnjena v orodju z enoosnim tlakom (600 MPa) in potem deformirana, da so bili dobljeni vzorci sposobni za penjenje. Vzorci so bili izpostavljeni procesu penjenja pri temperaturi 710°C. Dobljeni vzorci so bili vrtani pri razli~nih hitrostih rezanja (10, 30, 50, 70) mm/min in hitrostih podajanja (0,15, 0,225, 0,30) mm/r, s svedri z razli~nimi premeri (4, 5, 6) mm. Ugotovljeno je, da pena vpliva na lomljenje ostru`kov, oprijemanje ostru`kov pa se pove~uje proporcionalno s hitrostjo rezanja. Pokazalo se je, da na odstopanja od kroga bolj vpliva hitrost podajanja kot pa hitrost rezanja.

Archives of Metallurgy and Materials

“…With the increase of V c , the friction between the cutting tool and the workpiece will increase, thus causing an increase in the heat generated in the cutting zone. The rising heat will reduce the yield strength of the test material somewhat and cause a decrease in the power requirement [32][33][34]. Moreover, the low thermal conductivity of Custom 450 stainless steel is thought to contribute to this effect.…”

Al2014 Alüminyum Alaşımının Delinmesinde İtme Kuvvetinin Sonlu Elemanlar Yöntemi İle Analizi

“…Kara İlerleme miktarının (f) artması ile hem deneysel hem de nümerik analiz sonuçlarında itme kuvvetinin (F z ) arttığı gözlenirken, kesme hızının artması ile itme kuvvetinin (F z ) azaldığı belirlenmiştir. Bu sonuçlar literatür ile doğru orantılı olup nümerik modelleme çalışmalarının geçerli olduğunu göstermiştir [15][16][17]. Deneysel ve simülasyon sonuçları arasında ortalama %7 kabul edilebilir sınırlar içerisinde sapma olduğu tespit edilmiştir.…”

Modeling and experimental analysis of Al2219/n-TiC/Gr powder-based process parameters using desirability approach and genetic algorithm

“…[10][11] The powder-processing technique adopted for the manufacture of hybrid metal-matrix composites (HMMC) compares to all the other HMMC fabrication processes due to its big advantages. [12][13][14] The identified process parameters that influence the mechanical properties are the compaction pressure, the sintering time and the temperature used for the powder-based manufacturing method. 12 An inappropriate selection of the powder-based process parameters leading to poor mechanical properties and sintered density, e.g., a low compaction pressure and sintered temperature, lead to a poor density and bonding nature; so a great attention to the selection of appropriate powder-metallurgy process parameters is required.…”

“…12 An inappropriate selection of the powder-based process parameters leading to poor mechanical properties and sintered density, e.g., a low compaction pressure and sintered temperature, lead to a poor density and bonding nature; so a great attention to the selection of appropriate powder-metallurgy process parameters is required. [13][14][15] Response-surface methodology (RSM) is an optimization tool adopted to understand the behaviour and interaction effects of the process parameters on the responses. 16 Developed mathematical models were used for the prediction of MMC properties.…”