Department of Manufacturing Engineering
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Browsing Department of Manufacturing Engineering by Author "Davut, Kemal"
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Item INVESTIGATION OF CARBURIZED QUENCHING PROCESS OF SHAFTS USING COMPUTER SIMULATIONS(2022-02-28) Yazır Terzi, Büşra; Şimşir, Caner; Davut, KemalCarburizing and subsequent quenching heat treatments are commonly used industrial processes to improve the properties and performance of steel shafts. Variation of the case depth related to these treatments are the most frequent reason for product rejection. Therefore, the major aim of this study is to identify the suitable control parameters for subsequent optimization of carburized quenching DIN 16MnCr5 (1.7131) steel shafts. Another aim is to estimate inevitable experimental variations and determine the accuracy of computer simulations in presence of experimental uncertainties in the process parameters. This study is performed on both experiments and simulations. Experimental study is used to verify the simulations. In order to determine the control parameters of the process, a local sensitivity analysis is conducted using computer simulations in which each control parameter is perturbed around its reference state and the associated dimensional changes were correlated to those perturbations by a dimensionless sensitivity index. Additionally, for the purpose of identifying the effective parameters, a virtual design of experiments is performed on finite element method software SYSWELD®.Item INVESTIGATION OF CARBURIZED QUENCHING PROCESS OF SHAFTS USING DESIGN OF EXPERIMENTS(2022-03-01) Yılmaz, Hasan; Şimşir, Caner; Davut, KemalCarburizing is a widely-used thermochemical heat treatment process in shaft manufacturing. Insufficient case-depth, inadequate surface/core hardness, and distortion are the common reasons for scrapped products after carburizing. Thus, understanding, control and optimization of the process parameters in carburizing is crucial to avoid losses. In this study, carburizing parameters were investigated and optimized by Design of Experiments (DoE) using the Taguchi method. The target of the optimization is the minimization of the variability in the production due to the use of different furnaces for the process. Experiments were carried out on as-turned shafts (plain and stepped) made of two different grades of steel (16MnCr5 and 20NiCrMo2-2) using two different industrial gas carburizing furnaces. After the carburizing experiments, dimensional changes were measured using a Coordinate Measurement Machine (CMM), while carbon and hardness profiles were determined using Optical Emission Spectroscopy (OES) and Vickers indentation techniques. The results indicated that carbon potential of the carburizing gas is the most important parameter associated both with the variability and the mean effect for the case-depth and the diameter change.