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    Design and applications of a pneumatic accelerator for high speed punching
    (ELSEVIER SCI LTD, 2007) Yaldiz, Suleyman; Saglam, Haci; Unsacar, Faruk; Isik, Hakan
    High speed forming is an important production method that requires specially designed HERF (high energy rate forming) machines. Most of the HERF machines are devices that consist of a system in which energy is stored and a differential piston mechanism is used to release the energy at high rate. In order to eliminate the usage of specially designed HERF machines and to obtain the high speed forming benefits, the accelerator which can be adapted easily onto conventional presses has been designed and manufactured in this study. The designed energy accelerator can be incorporated into mechanical press to convert the low speed operation into high-speed operation of a hammer. Expectations from this work are reduced distortion rates, increased surface quality and precise dimensions in metal forming operations. From the performance test, the accelerator is able to achieve high speed and energy which require for high speed blanking of thick sheet metals. (c) 2005 Elsevier Ltd. All rights reserved.
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    Design, development and testing of a four-component milling dynamometer for the measurement of cutting force and torque
    (ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2007) Yaldiz, Suleyman; Unsacar, Faruk; Saglam, Haci; Isik, Hakan
    The cutting forces generated in metal cutting have a direct influence on generation heat, tool wear or failure, quality of machined surface and accuracy of the work piece. In this study, a milling dynamometer that can measure static and dynamic cutting forces, and torque by using strain gauge and piezo-clectric accelerometer has been designed and constructed. The orientation of octagonal rings and strain gauge locations has been determined to maximise sensitivity and to minimise cross-sensitivity. The force and torque signals were captured and processed using proper data acquisition system. The dynamometer has been subjected to a series of tests to determine its static and dynamic characteristics. The results obtained showed that the dynamometer could be used reliably to measure static and dynamic cutting forces and torque. (c) 2006 Elsevier Ltd. All rights reserved.
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    The effect of tool geometry and cutting speed on main cutting force and tool tip temperature
    (ELSEVIER SCI LTD, 2007) Saglam, Haci; Yaldiz, Suleyman; Unsacar, Faruk
    In this paper, the effects of rake angle and entering angle in tool geometry and cutting speed on cutting force components and the temperature generated on the tool tip in turning were investigated. The data used for the investigation derived from experiments conducted on a CNC lathe according to the full factorial design to observe the effect of each factor level on the process performance. As the experiments were designed using an orthogonal arrays, the estimates of the average effects will not be biased. During the tests, the depth of cut and feedrate were kept constant and each test was conducted with a sharp uncoated tool insert. For a comparison, the main cutting force and the temperature generated in secondary shear zone for different cutting parameters and tool geometries were calculated by Kienzle approach and with based on orthogonal cutting mechanism, respectively. The average deviation between measured and calculated force results were found as 0.26%. For statistical analyze the orthogonal arrays as L-16 was used with a total of 16 tests. Finally, it was found that rake angle was effective on all the cutting force components, while cutting speed was effective on the tool tip temperature. The cutting force signals and temperature values provided extensive data to analyse the orthogonal cutting process. (c) 2005 Elsevier Ltd. All rights reserved.
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    Virtual Training Centre For CNC: a Sample Virtual Training Environment
    (BUCHAREST UNIVERSITY PRESS, 2007) Sahin, Mehmet; Yaldiz, Suleyman; Unsacar, Faruk; Yaldiz, Y. Burak; Bilalis, Nikolaos; Maravelakis, Emmanuel; Antoniadis, Aristomenis
    It is a fact that virtual training has been a scope of interest for vocational training for a very long time. However, it needs more time to be more common in all specific training fields. This paper presents the development of a Virtual Training Centre (VTC) to promote and reinforce Vocational Training in Computer Numerical Control (CNC) Machines. "Virtual Training Centre for CNC" is a multilateral LdV project and of high importance in terms of virtual teaching and learning in vocational education and training. This virtual training environment is based on a common curriculum developed by the project partners. Since it is an interactive training tool, accessibility is the most important advantage over other training tools in VET.