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Cakr A.,TAI Turkish Aerospace Industries | Yagmur S.,Gazi University | Kavak N.,Bulent Ecevit University | Kucukturk G.,Gazi University | Seker U.,Gazi University
International Journal of Advanced Manufacturing Technology | Year: 2015

Cutting fluid application plays an important role in the improvement of cutting performance during machining processes. However, controlling the amount of the coolant used is important in terms of its effects on the environment, human health and also on the total cost of production. Another important concern is to avoid lowering the product quality and cutting tool life when the amount of coolant is decreased. The minimum quantity lubrication (MQL) method that has been developed in recent years is suitable for meeting these needs. In this study, the MQL technique was applied in the turning of AA7075 and AA2024 aluminium alloys. The samples were subjected to four different cutting speeds (150, 187.5, 240 and 300 m/min), two different feed rates (0.1 and 0.2 mm/rev) and four different flow rates (0.25, 0.45, 0.90 and 3.25 ml/min). At the end of experiments, it was observed that increased feed rate and cutting speed had a negative effect on surface quality, while increased flow rate exhibited a positive effect on surface quality. © 2015 Springer-Verlag London Source

Tekin E.,TAI Turkish Aerospace Industries
Procedia CIRP | Year: 2014

The complex aerospace manufacturing information management systems of the future will challenge the methods of maintaining "As-Built Product Structure" while there is an ongoing need to revise or modify products in production or service stages. As the whole supply chain of a product is considered, it becomes more complex to maintain the relations of the design data up to requirements and the relations of the components down to serial numbers and lot/batch numbers. Establishment of these relations will provide traceability for the "to be" information of the functions of the product and "realized" information of the parts/material of the product. This paper will present a method of maintaining "As-Built Product Structure" through a manufacturing data management system for the whole supply chain. © 2014 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license. Source

Isci H.,TAI Turkish Aerospace Industries | Simsek S.,TAI Turkish Aerospace Industries | Tekincen O.,TAI Turkish Aerospace Industries | Suer I.,TAI Turkish Aerospace Industries
AIAA Modeling and Simulation Technologies Conference 2010 | Year: 2010

Certification for Military Aircrafts is a relatively new topic because acceptance and flight clearances were generally performed as Qualification in the past. The new concept of "As much as civil, as necessary as military" is widely accepted in military airworthiness to have better safety records for military aircrafts. In military applications further requirements must be derived for accessibility and ease of operation of the crew interfaces, including the effects of crew military equipments (such as helmet, gloves etc.), additional military tasks and the operating environment. There are various studies available showing that the high levels of automation in new generation aircrafts have without a doubt offered considerable advances in safety over their forbearers, however new types of error have begun to emerge on these flight decks. Aircraft status information should be sufficiently accurate and operationally oriented to allow the crew, under any circumstances (including degraded modes), to be aware of the remaining operation capabilities of the aircraft. The effects of human errors in managing the system, including assessment of the potential for error, the possible severity of the consequences, and the provision for recognition and recovery from error must be evaluated with representative set of pilots in a representative environment. While making assessments for a military aircraft, certain situations which create additional difficulty for the pilot must be taken in to consideration. There should be some margin for additional workload and human errors for those aggravating factors. In this paper, aggravating factors for military environment, such as sustained g, night vision goggle operation, etc. are discussed. Simulator requirements are classified for different stages of aircraft evaluation and conceptual simulator which simulates those factors is described. © 2010 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Source

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