Gears are used in the design of modern machines extensively. These gears are of various types according to their tooth profiles and tooth widths, and can be manufactured in various sizes as small as the ones in small appliances to the very large gears used in heavy industry. In addition, some of the gears have proven benefits, and universally accepted standard manufacturing methods have been developed in time for these gears. However, researchers have always made more experiments, believing that there is no end in science, and have performed research activities in order to contribute to the science a little more. And numerous researches have been carried out on the gear wheels, and many successful studies have been presented. In this study, involute profile cylindrical gears were manufactured at the CNC milling machines and the results were evaluated. The idea that these involute profile cylindrical gears can be manufactured at the CNC milling machines by two different methods, which are completely different from the present manufacturing methods, was proposed by other researchers. Although these gears were proven useful by the researchers, they were not widespread because of the previous unsuccessful methods developed for their production.

Curvilinear profiled involute gears have more favorable working conditions compared to spur gears and arrow profiled gears. However, these gears cannot be manufactured by conventional manufacturing methods. The use of curvilinear profiled gears was not widespread in the industry due to these difficulties encountered in the manufacturing. In this study, the existing manufacturing methods of current gears have been investigated. In addition to CNC manufacturing method, which eliminated the difficulties encountered in the present manufacturing methods, 3D printers were used to manufacture curvilinear involute gears and presented as an alternative manufacturing method.

En tr In this study, it was aimed to investigate the effect of CrC particles in Cu matrix, Cu matrix composite material production, CrC particles hardness value of Cu matrix composites using powder metallurgy (P / M) method. . For this purpose, CrC particles in pure Cu dust were added at different ratios of 5%, 10%, 15% and 20% by weight. The prepared samples were stirred for 24 hours using a turbula mixer. The prepared mixtures were shaped under a pressure of 450 MPa. The shaped parts were sintered at 950 ⁰C for 60 minutes. The actual and theoretical densities of the sintered samples were determined The success rate of sintering was evaluated by examining the intensity and SEM images. Microstructure and mechanical properties of the produced composite materials were investigated. Microstructure and hardness values of the produced composite materials were investigated. Microscope studies were performed using scanning electron microscopy (SEM). In the SEM study, it was observed that the CrC phase was uniformly distributed in the Cu matrix composed of coaxial grains. In the hardness measurements made, it was observed that as the CrC ratio increased, the hardness increased accordingly. Bu çalışmada, toz metalürjisi (T/M) yöntemi kullanılarak farklı oranlarda CrC partikülleri, Cu matrisi içerisinde kullanılarak Cu matrisli kompozit malzeme üretimi amaçlanmıştır. Bu amaçla Saf Cu tozu içerisine CrC partikülleri ağırlıkça %5, %10, %15 ve %20 olmak üzere farklı oranlarda katılmıştır. Hazırlanan karşımlar 450 MPa basınç altında şekillendirilmiştir. Şekillendirilen parçalar 950 ⁰C’de 60 dakika boyunca sinterlenmiştir. Sinterleme işleminin başarısı yoğunluğun ve SEM görüntülerinin incelenmesi ile değerlendirilmiştir. Üretilen kompozit malzemelerin mikroyapı ve mekanik özellikleri incelenmiştir. Mikroskop incelemeleri taramalı elektron mikroskobu (SEM) kullanılarak yapılmıştır. Yapılan SEM incelenmesinde, eş eksenli tanelerden oluşan Cu matrisi içerisinde CrC fazının dengeli dağıldığı gözlenmiştir. Yapılan sertlik ölçümlerinde, CrC oranı arttıkça buna bağlı olarak sertliğin arttığı gözlenmiştir.