Cutting fluid application plays an important role in the improvement of cutting performance during machining processes. However, controlling the amount of the coolant used is important in terms of its effects on the environment, human health and also on the total cost of production. Another important concern is to avoid lowering the product quality and cutting tool life when the amount of coolant is decreased. The minimum quantity lubrication (MQL) method that has been developed in recent years is suitable for meeting these needs. In this study, the MQL technique was applied in the turning of AA7075 and AA2024 aluminium alloys. The samples were subjected to four different cutting speeds (150, 187.5, 240 and 300 m/min), two different feed rates (0.1 and 0.2 mm/rev) and four different flow rates (0.25, 0.45, 0.90 and 3.25 ml/min). At the end of experiments, it was observed that increased feed rate and cutting speed had a negative effect on surface quality, while increased flow rate exhibited a positive effect on surface quality.

ÖzetBu çalışmada, endüstride çok kullanılan AISI 1040 çeliğinin işlenmesinde, kesme hızı ve ilerleme değerinin yüzey pürüzlülüğüne etkisi deneysel olarak incelenmiştir. Deneyler, kesme derinliği sabit tutularak (2 mm), farklı kesme hızı (46. 91 ve 128 m/dk) ve ilerleme değerlerinde (0.16, 0.22 ve 0.28 mm/dev) ve kaplamasız sementit karbür kesici takımlar kullanılarak kuru tornalama ile yapılmıştır. İş parçasının yüzey kalitesinin, ilerleme miktarının artması veya kesme hızının azalması ile kötüleştiği gözlenmiştir. Bu çalışma sonucunda, 2 mm kesme derinliği için 128 m/dk kesme hızı, 0.16 mm/dev ilerleme değerinin yüzey kalitesi açısından en uygun kesme şartları olduğu görülmüştür.Anahtar Sözcükler: İşlenebilirlik, Kesme parametreleri, Yüzey pürüzlülüğü AbstractIn this study, the effect of cutting speed and feed rate on the surface roughness was investigated experimentaly in the machining of AISI 1040 steel being mostly used in industry. Experiments was done by dry turning with uncoated cementite carbite cutting tools at different speeds (46. 91 ve 128 m/dk) and feed rates (0.16, 0.22 ve 0.28 mm/dev) while cutting depth stays stable at 2 mm. It was observed that workpiece surface quality get worse with the increase of feed rate or decrease of cutting speed. As a result of this work, it was seen that 128 m/min cutting speed and 0.16 mm/rev feed rate for the 2 mm cutting depth are the optimum cutting conditions from the point of surface quality.

The objective of this study is to investigate the surface roughness that effect the capability of adhesive with adding aluminium powder and 63/37 Sn-Pb soft solder powder to the epoxy to increase the mechanical strength of joints. The adhesive strength of the joints was determined by utilizing the single-lap shear test. As seen from the experiments, the surface roughness has an important effect on the strength of adhesive bonded joints. Experimental results show that joints prepared by adhesive which was modified, adding in the amount of 5 wt% 63/37 Sn-Pb powder have more mechanical strength than joints compared to one which is prepared by adding aluminium powder with different ratios as 5, 25,50 wt%.

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Joining of components is usually accomplished by mechanical fastening, welding, or adhesive bonding. Apart from the classical methods, various hybrid methods applied with adhesives are widely used in industry to bond mechanical parts. This study describes a new hybrid bonding method as an alternative to currently used hybrid methods: adhesive-soft soldered joints. In this new hybrid technique, joints are made by adding various (5 wt%, 15 wt%, 25 wt%, and 50 wt%) amounts of soft soldering alloy powder into the adhesive at two different temperatures (180℃ and 200℃). The strength of the joints is measured by tensile shear tests. The mechanical strength of adhesive joints carried out by adding soft soldering powder melted at 200℃ is higher than that of joints with only adhesives and unmelted soft soldering powders. The developed hybrid method is applied to attach the insert to cutting tools used in the machining industry and the feasibility of the method is investigated with experiments.