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Öğe Customer driven product determination with fuzzy logic and Taguchi approaches(2010) Göloglu, C.; Mizrak, C.Severe competition conditions in today's market and the necessity of answering raised customer satisfaction level force firms to direct themselves into a customer oriented tendency in product design and assembly. Do it yourself approach, which requires customer involvement in final assembly, helps manufacturers in lessening production cost and also makes benefits in short product due time. However, it requires that the customer should be more conscious. Experts that help and direct customer at decision making process can be necessitated. Shortage on the experts that give idea and the difficulty on that customer express his/her requests cause negativities in obtaining customer's desired answer on the demanded product. The reality that customers best know what they desire and, in general, they use linguistic descriptions on the issue need an auxiliary mechanism for decision making process. Therefore, in this paper, a customer driven product determination process was realized for a product evaluated as do it yourself product. Due to demonstrate the effectiveness of the model a numeric example was given and its success was obtained above 90%.Öğe Determination of cutter path strategies and cutting parameters effects on surface roughness in pocket milling by TAGUCHI method(2006) Sakarya, N.; Göloglu, C.In pocket milling operations, which they are often encountered in plastic mould manufacture, narrowing the gap as far as possible between the surface roughness values obtained at finish milling and the surface roughness values met by further finishing operations is in demand. Selection of cutting speed, feed rate, depth of cut and step over values with appropriate cutter path strategies are all important variables which define cutting time and surface texture. The effects of every single variable on surface roughness are known, but results revealed in their combinations cannot be clearly estimated. In the experimental study conducted, surface roughness variations under different cutter path strategies and cutting parameters in pocket milling have been investigated. In finish milling one direction, back and forth and spiral cutter path strategies have been employed. Four different levels for cutting speed, feed rate, depth of cut and step over values have been determined and design of experiment has been conducted by Taguchi orthogonal array. The experiments are done on commonly used IMPAX EN/DIN 1.2738 mould material with four flutes HSSE end mills. ANOVA tables have been compiled with average surface roughness values obtained from the experiments. The effects of related parameters on surface roughness have been determined for each cutter paths. The ideal cutter path strategy under the conditions considered in pocket milling has been found out as spiral.Öğe Determination of form defects depending on tool deflection in ball end milling of convex and concave surfaces(Gazi Universitesi Muhendislik-Mimarlik, 2014) Gök, A.; Göloglu, C.; Demirci, H.I.Altering in surface forms cause to varying cutting forces in machining of inclined surfaces by ball end mills. The deflections appeared by cutting forces can result in form defects in workpiece. Finding deflection values and related form defects has a significant importance for keeping the production within the appropriate tolerances and in lessening production costs. The aim of this study is to evaluate form defects depending on tool deflection in milling of inclined convex and concave surfaces of EN X40CrMoV5-1/DIN 1.2344 using TiAlN-coated cutting tool. The experiments have been conducted with different cutting tools strategies and cutting parameters at related parameter levels. During machining real time cutting tool deflections are recorded by inductive sensors for the experiments. Then, the form defects of machined specimens caused by cutting tool deflections are determined by 3D optical scanning. The cutting tool deflection values and the values of 3D optical scanning form defects have been compared. The largest cutting tool deflections and form defects are detected at the ramping regions with the milling position angles of 45° to 60° for the convex and concave surface types. In addition, the regions that the largest tool deflections have been observed are the same regions with the largest form defects obtained by the optical scanning. As a result, at the determination of form defects caused by cutting tool deflection, the deflection values obtained by real time measurement are coincided with the measurement obtained from 3D optical scanning.Öğe Development of surface roughness model for machining by genetic programming(2006) Göloglu, C.; Arslan, Y.One of the cutter path strategies used in pocket milling in machining is spiral cutter path strategy. The correct selection of cutter path and cutting parameters affects directly upon manufacturing time, machining surface status and cost. The surface roughness that could be obtained from pocket milling by the different cutter parameters of spindle speed, feed rate, depth of cut and step over, and spiral cutter path strategy has been modelled by Genetic Programming (GP). Training and verification data sets have been compiled using real cutting data based on the related material and cutting conditions. Different experiments have been conducted with different genetic operators and a surface roughness model with a 98% performance value has been obtained based on the models generated. The results obtained show that GP approach produces successful models. Development of models based on different material and cutting conditions using GP will provide important contribution to manufacturing. The GP software prepared for modelling can be applied to inverse problems that the answers are known but the questions.
