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Öğe Experimental Research of the Usability on Double Acting Intensifiers in Hydroforming(EDP Sciences, 2018) Günaydln A.C.; Halkacl M.; Ateş F.; Halkacl H.S.The hydroforming method is especially used for forming lightweight materials like aluminum, magnesium alloys, high strength steels or materials that have limited formability. Intensifiers are the most important component of hydroforming presses. Nowadays single-Acting intensifiers are used in hydroforming presses. Single-Acting intensifiers provide pressurized liquid by forwarding movement of the piston through one direction and their volumes are limited. The mass of the intensifiers increases significantly depending on their liquid volume capacity and this causes high manufacturing costs. For this reason, two or more single-Acting intensifiers which bridged in a parallel circuit are used to manufacture bigger products that require a high volume of liquid. But this method is not an economical solution. So double-Acting intensifiers can overcome this problem. The pressurized liquid can be obtained during both forward and backward movement of the piston in double-Acting intensifiers which work like a pump. This is why double-Acting intensifiers have no volume limit on the contrary of single-Acting intensifiers. Yet there are sudden pressure drops in double-Acting intensifiers caused by returning movements of the piston to pressurize liquid again. This pressure drops cause some problems to use double-Acting intensifiers on hydroforming method. The situation of solving this problem to use double-Acting intensifiers on the hydroforming method can eliminate limited volume problem and decrease investment cost of hydroforming presses. In this study, the usability of double-Acting intensifiers on hydroforming with die method was investigated. Because of the existing hydroforming press, used in experiments, doesn't contain any double-Acting intensifiers, pressure drops obtained by single-Acting intensifier to perform simulated experiment. A die was designed and manufactured to synchronize the blank holder force with pressure drops. This die was integrated on the hydroforming press, located on Selcuk University Hydroforming Laboratory, for the success of the process. Performance of improved system was measured as well as repeatability of applying process parameters and product's geometry were determined. The AA5754 aluminum alloy used processes, both single-and double-Acting intensifier, were compared. Limiting drawing ratios were determined for all processes. It is obtained that pressure drops have no negative influence on formability. Moreover, there is no difference observed in thickness distribution which is an indicator of product's quality and strength. However, when geometric accuracy was investigated then noticed that the pressure drops count has a good influence on product radius. 5.96 mm product radiuses on the process with single-Acting intensifier was obtained 5.92 and 5.10 mm by using double-Acting intensifier increasing pressure drop's frequency. © The Authors, published by EDP Sciences, 2018.Öğe Grobner-Shirshov bases and embedding of a semigroup in a group(Jangjeon Mathematical Society, 2015) Karpuz E.G.; Ateş F.; Çevik A.S.; Koppitz J.The main goal of this paper is to show that if a group G has a Grobner-Shirshov basis R that satisfies the condition R+, then the semigroup P (with positive rules in R as a defining relation) embeds in this group G. As a consequence of our result, we obtain that the semigroup B+n+1 of braids can be embedded in the braid group.Öğe A new example for minimality of monoids(2010) Ateş F.; Karpuz E.G.; Güngör A.D.; Çevik A.S.By considering the split extension of a free abelian monoid having finite rank by a finite monogenic monoid, the main purposes of this paper are to present examples of efficient monoids and, also, minimal but inefficient monoids. Although results presented in this paper seem as in the branch of pure mathematics, they are actually related to applications of Combinatorial and Geometric Group-Semigroup Theory, especially computer science, network systems, cryptography and physics etc., which will not be handled here. © 2010 World Scientific Publishing Company.Öğe Special curves in finsler space(Institute of Mathematics and Mechanics, National Academy of Sciences of Azerbaijan, 2018) Ateş F.; Özdemir Z.; Nejat Ekmekci F.As one point moves along a curve, if the Frenet vectors are carried to the center of the unit Finsler sphere F S 2 at this point then these vectors trace curves on the F S 2 . These curves called as spherical images of the curve c. In this study, we investigate the Finslerian spherical images of any curve in Finsler space F 3 . Also, we obtain the Frenet-Serret formulas of these new curves in terms of Finsler invari-ants. Furthermore, these curves are exemplified using the Randers metric which is a special structure of the Finsler metric. Finally, these curves are illustrated on the F S 2 . © 2018, Institute of Mathematics and Mechanics, National Academy of Sciences of Azerbaijan. All rights reserved.
