Machinability properties of Al–7Si, Al–7Si–4Zn and Al–7Si–4Zn–3Cu alloys

Abstract

Al-7Si, Al-7Si-4Zn, Al-7Si-4Zn-3Cu alloys were produced by permanent mold casting method to investigate the effects of copper and zinc additions on the machinability properties of Al-7Si alloy. The structural and mechanical properties of the produced alloys were investigated with conventional methods. Machinability properties of these alloys were determined by turning, and they were associated with structural and mechanical properties of the alloys. Machinability experiments were carried out in CNC vertical machining center under dry cutting conditions using uncoated carbide drill and constant cutting speed (120 m/min), feed (0.15 mm/rev) and depth of cut (15 mm) values. The microstructure of Al-7Si binary alloy was observed to be composed of aluminum-rich α phase, primary silicon crystals and eutectic Al-Si phase. The addition of 4% Zn to the Al-7Si alloy did not form a different phase in the microstructure. However, Al 2 Cu intermetallic phase was formed by addition of 3% Cu. While the hardness and tensile strength of the alloy increased, elongation to fracture significantly reduced. As a result of machinability experiments, it was observed that the minimum thrust force and surface roughness occurred in Al-7Si-4Zn-3Cu alloy, while the maximum built-up edge was observed during drilling of Al-7Si and Al-7Si-4Zn alloys. Microhardness value of machined surface in Al-7Si alloy was found to be the minimum while the maximum Al-7Si-4Zn-3Cu alloy was observed.

Al-30Zn Alaşımının Delinmesinde Yüzey Cevap Metodu (YCM) Kullanarak İlerleme Kuvveti ve Yüzey Pürüzlülüğünün Optimizasyonu

“…Drilling tests were carried out on the samples having the dimension of 50x80x15 mm prepared by milling from alloy ingots. These tests were conducted with Johnford VMC 850 CNC vertical machining center with 7.5 kW and 6000 rpm, Kistler 9273 three-component dynamometer for measuring thrust force, Kistler 5070A signal amplifier and Dynoware software for converting vibration signals into thrust force-times graphics (Figure 2) (Bayraktar and Afyon, 2020). Three different cutting speeds (600, 900 and 1200 rev/min), feed rate (0.05, 0.15 and 0.25 mm/rev) and 20 mm depth of cut were used as cutting parameters.…”

Properties of TiN–Al2O3–TiCN–TiN, TiAlN, and DLC‐coated Ti(C,N)‐based cermets and their wear behaviors during dry cutting of 7075 aluminum alloys

“…7075 aluminum alloy consisting of Al‐Zn‐Mg‐Cu is an ultralumin material which has the highest strength 22 . Due to the superior stress corrosion resistance and strength, the alloy has been widely used in the field of weapon, aircraft, and other industries 23–26 . However, poor weldability of 7075 aluminum alloy makes it necessary to machine aluminum alloy parts and components in one step 27 .…”

“…22 Due to the superior stress corrosion resistance and strength, the alloy has been widely used in the field of weapon, aircraft, and other industries. [23][24][25][26] However, poor weldability of 7075 aluminum alloy makes it necessary to machine aluminum alloy parts and components in one step. 27 Today, cemented carbides are still the most used cutting tools for 7075 aluminum alloy.…”

Research on blade grouping method for array machining

“…There are many blade processing methods and the most commonly used is multi-axis CNC machining. 3–5 The common CNC machining tool can only process one blade at a time and its processing efficiency is low. While the multi-spindle blade CNC machining technology can process multiple blades at the same time, it is difficult to ensure the machining consistency and accuracy.…”