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Öğe Data extraction from CAD model for rotational parts to be machined at turning centres(Scientific and Technical Research Council of Turkey, 1999) Aslan, E.; Seker, U.; Alpdemir, N.Among the most important data produced and stored is product data. CAD data forms one of many contributors to product data. Although in most circumstances CAD data can be processed within the CIM environment by integrated software components to produce information like manufacturing data, assembly data, etc., there are a significant number of cases where an external CAD resource needs to be processed. An external CAD resource comes in the form of a neutral file format such as DXF, IGES, STEP, etc. Extracting the necessary information from an exchange file to generate manufacturing parameters thus becomes an important task. In this paper we present the results of our research efforts which were intended to extract information from the defacto industry standard DXF files to determine features existing on rotational parts to be machined on turning centres, and later utilise this information in the context of a software package implemented to develop a post-processing expert system. The feature extraction module presented in this paper, forms part of that expert system, which is named ASALUS (Aslan, 1995) and is illustrated in Figure 1. ASALUS is designed to manage the life cycle of rotational parts from the design all the way to the production by performing process planning using a generative approach and applying post-processing for two different CNC lathes.; Among the most important data produced and stored is product data. CAD data forms one of many contributors to product data. Although in most circumstances CAD data can be processed within the CIM environment by integrated software components to produce information like manufacturing data, assembly data, etc., there are a significant number of cases where an external CAD resource needs to be processed. An external CAD resource comes in the form of a neutral file format such as DXF, IGES, STEP, etc. Extracting the necessary information from an exchange file to generate manufacturing parameters thus becomes an important task. In this paper we present the results of our research efforts which were intended to extract information from the defacto industry standard DXF files to determine features existing on rotational parts to be machined on turning centres, and later utilize this information in the context of a software package implemented to develop a post-processing expert system. The feature extraction module presented in this paper, forms part of that expert system, which is named ASALUS (Aslan, 1995) and is illustrated in Figure 1. ASALUS is designed to manage the life cycle of rotational parts from the design all the way to the production by performing process planning using a generative approach and applying post-processing for two different CNC lathes.Öğe The effect of cutting parameters on cutting force during the processing of inconel 718 super alloy(2007) Tasliyan, A.; Acarer, M.; Seker, U.; Gökkaya, H.; Demir, B.In this study, the effects of cutting parameters such as cutting speed, feed rate and cutting depth over cutting forces have been investigated. For this purpose, nickel based super alloy Inconel 718 has been processed with ceramic cutting tool having 1.2 mm insert radia on a digitally controlled turning lathe (CNC) without using cooling water. Different cutting processes having the values of five different cutting speeds (225, 300, 350, 400, 500 m/dak) and five different feed rates (0.05, 0.075, 0.1, 0.125, 0.15 mm/rev) and two different cutting depths (1mm, 2mm) have been implemented. In the experiments, the lowest main cutting force was obtained as (A-1-V) 192 N in 500 m/min cutting speed, 0.05 mm/rev feed rate speed and 1 mm depth of cut, the highest main cutting force was obtained as (B-5-I) 780 N in 225 m/min cutting speed, 0.15 mm/rev feed rate speed and 2 mm depth of cut.Öğe An experimental investigation of effect of cutting parameters on cutting zone temperature in drilling(2013) Yagmur, S.; Acir, A.; Seker, U.; Günay, M.Drilling is one of the most important machining processes in manufacturing industry. Recently, the work dealing with the problems encountered during drilling and their solution has been increased. Modelling of thermal and mechanical loads developed during drilling has also been increased. In this study, the drillability of AISI 1050 steel widely used in industrial applications will be investigated under various drilling types (hole type) cutting parameters (60, 75, 90 and 108 m/min cutting speed and 0.15, 0.20 and 0.25 mm/rev feed) and cutting tool type (uncoated and TiN/TiAl/TiCN coated solid carbide). Cutting temperatures developed along the drill rake face when drilling with coated and uncoated drill bits will be measured with the help of K type thermocouples inserted in the cooling channels of the drills. When the results of the experiments are evaluated, cutting temperature decreased with increasing feed and coating application significantly reduced cutting temperatures in the cutting zone. Coating application has provided significant benefits in the all parameters.Öğe An investigation into the influences of grain size and grinding parameters on surface roughness and grinding forces when grinding(2010) Demir, H.; Gullu, A.; Ciftci, I.; Seker, U.This study was carried out to investigate the effects of grain size on workpiece surface roughness and grinding forces when surface grinding AISI 1050 steel. A previously designed and constructed dynamometer was used to measure and record the forces developed during grinding. Grinding tests were carried out using different grinding wheels of different grains. Ground surface roughness measurements were also carried out. The results showed that grain size significantly affected the grinding forces and surface roughness values. Increasing grain size and depth of cut increased the grinding forces and surface roughness values. For different grain sizes, depth of cuts of 0.01 and 0.02 mm did not result in any significant variations in the grinding forces but further increase in depth of cut led to variations of up to 50% in grinding forces. © 2010 Journal of Mechanical Engineering. All rights reserved.Öğe An investigation of cutting speed effects on geometric tolerances in turning of AA 7075 aluminum alloy(Institute of Physics Publishing, 2018) Bozkurt, S.; Tekaüt, I.; Demir, H.; Seker, U.The main purpose is to produce the machine parts within the defined geometric limits for performing their functions where they are assembled. Production between the tolerance values stated in the technical drawing is very important for rapid assemblying of the shaft-hub connections working with the longevity of the moving mechanisms accurately. Because, production of machine parts at geometric tolerances is required in order to minimize the error-free assembly and undesirable conditions (heating, vibration, wear etc.). For this purpose, AA 7075 T651 aluminum alloy, which is frequently used in aviation, defense, automotive industry where desired geometric tolerance values are so important, is used as workpiece. It was machined by four different coating speeds (100, 200, 300 and 400 m/min), 0.1 mm / 0.5, 1.5 and 3 mm cut depths. The effects of cutting speed on geometric tolerances (cylindricality, circularity, linearity) after processing were investigated. It was observed that the increase of cutting speed is an effective parameter for increasing or decreasing the geometric tolerance values obtained. Increasing cutting speed was resulted in increase of tool vibration, and so increased vibration led to an increase in geometric tolerance values. © 2018 Institute of Physics Publishing. All rights reserved.
