نتایج جستجو برای: optimum die
تعداد نتایج: 192310 فیلتر نتایج به سال:
In this paper, an analytical method for noncircular shape extrusion is presented. Using this method, non-linear deformation field can be described with Hermit cubic spline which is prescribed by the boundary conditions of the die at its entryand exit. The upper bound method has been used to obtain optimum coefficient of the tangential boundary conditions. The results show that the optimum tange...
In this paper, an analytical method for noncircular shape extrusion is presented. Using this method, non-linear deformation field can be described with Hermit cubic spline which is prescribed by the boundary conditions of the die at its entryand exit. The upper bound method has been used to obtain optimum coefficient of the tangential boundary conditions. The results show that the optimum tange...
Drawing of square section rod from round bar can be done with two die shapes. In the first die shape, deformation starts from corners of the square and in second die shape, deformation starts from sides of square. This article has compared the drawing force for both die shapes and as a result optimum die shape was determined. Due to complexity of metal flow inside the die, analyzing of actual p...
In this research, optimization process of axisymmetric extrusion dies is proposed. Plastic zone is analyzed using finite element method in the Eulerian system with flow formulation. The die profiles are defined by Bezier curves with six control points. Two effective functions are considered in this research; standard deviation of the strain rate and the rate of energy consumption during extrusi...
die vorliegende arbeit geht hauptsachlich von folgenden fragen aus: was ist konkrete poesie? wleche historischen und literarischen hintergrunde hat diese stromung? kann man beispiele konkreter poesie im unterricht anwenden? wenn ja, wie? als antwort auf die letzte frage wird versucht, die verwendung der konkredten poesis im unterricht des deutschen als fremdsprache darzulegen und so gendanken, ...
die vorliegende arbeit geht von dem versuch aus, die behandlung des dramas im sprachunterricht einzubeziehen. die grundgedanken sind: 1- abwechselung in den unterricht zu bringen; 2- die lernenden zur eigenen sprachtatigkeit anzuregen; 3- an der bildung der lernenden mitzuwirken. das drama "die physiker" ist in dieser arbeit als beispiel fur den deutschunterricht bearbeitet worden. die ziele hi...
die vorliegende untersuchung besteht aus drei theoretischen und praktischen teilen sowie zwei anlagen. in dem theroretischen teil wrird auf die lehrmethode hingewiesen. auberdem werden vierzehn unterschiedliche themen und die wichtigsten resultate der durchgefuhrten meinungesumfragen vorgelegt. fur den praktischen teil wurden als beispiel 14 zielgerichtete und zusammenhangende themen uber allta...
rectangular waveguide (wr) is one of the earliest types of transmission lines. rectangular waveguide can be produced by hot extrusion process. in this paper, the hot extrusion process of cuzn5 rectangular waveguide was investigated by finite element method (fem). in addition, genetic algorithm method (ga) was used to optimize the die geometry and process conditions to achieve the lowest magnitu...
The assessment of the influence of the work-hardening of material on the optimum die profile and drawing force in rod drawing process is the main objective of the present paper. The upper bound solution, based on the assumption of perfect plasticity, has been extended to consider the work-hardening of the material during the rod drawing process through curved dies. Analytical results of drawin...
Metal forming processes, compared with machining ones, reduce production steps and increase manufacturing speed in addition to saving raw material. In this paper, forming process of column of a steering mechanism is investigated by finite element analyses and experimental tests; and optimum die design parameters are found. Forming process parameters including die opening angle, bearing length, ...
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