نتایج جستجو برای: hot closed die
تعداد نتایج: 324695 فیلتر نتایج به سال:
The performance of hot-forging dies, in which the die cavity is weld-deposited with a layer of modified H12 hot-work tool steel, has been studied, using a continuous monitoring of the die condition as well as macroscopic and microscopic examination. It was observed that the thickness of the hard upper ‘capping layer’ and that of an intermediate ‘buffer layer’ have a pronounced effect on the lif...
Today`s telecommunications/datacom industry is coping with its own technical challenges in processing capabilities as it juggles demands for greater electrical performance and reduced sizes. Particularly hot in technical slate are automatic eutectic attachment techniques, which are desirable for high-performance and high-capacity die attach applications. Actually, the eutectic die attach techni...
The paper reports on an investigation into the various aspects of closed die cold forging of polygonal powder preforms, which have been compacted and sintered from atomized powder. It is found that for certain dimensional ratios of the preform the die pressure is minimum. An attempt has been made for the determination of the die pressures developed for given geometries of the disc during the cl...
Background: In Iran, architectures are often unaware of the risk of radon inhalation and how to reduce radon levels. Furthermore, radon considerations are not implemented in construction methods, construction materials and building utilization by regulatory authorities. Materials and Methods: In this study after reviewing the meteorological changes of Ramsar over the past 50 years (1955-2005), ...
INFLUENCE OF CLOSED-DIE HOT COMPACTION PARAMETERS ON SELECTED PROPERTIES OF PM AL-SI-FE-CU MATERIALS
Radon, a progeny of 238U is formed from the radioactive decay of radium. One of the main sources of radon is the emanation from ground water. Radon gas dissolves in groundwater when it moves from the bed of volcanic rocks which contain radioactive elements such as uranium and thorium and then diffuse into spaces. In closed places, the accumulated radon that decays to radioactive particles can c...
In a closed die forging process, it is impossible to form complex shapes in one stage, and thus it becomes necessary to use preform dies. In the present study, Backward Deformation Method and FE simulation via ABAQUS software has been used in order to design preform die of the H-shaped parts. In the Backward Deformation Method, the final shape of the part is considered as a starting point and u...
Three important parameters in designing a closed die for forging process are ratio of width to flash thickness, ratio of height to billet diameter and the friction factor. In this paper the influences of these parameters on the required force for the forging and percentage of die filling were investigated. It was found that by controlling the flash dimension, the material loss is reduced and t...
thermal barrier coatings (tbcs) are used to provide thermal insulation to the hot section components of gas turbines in order to enhance the operating temperature and turbine efficiency. hot corrosion and thermal shocks are the main destructive factors in tbcs which comes as a result of oxygen and molten salt diffusion into the coating. in this thesis atmospheric plasma spraying was used to dep...
Thermal expansion and hot deformation are two phenomena causing dimensional errors in investment casting. This error occurs in dimensions between the die and wax pattern. Therefore, the wax's thermo-physical and thermo-mechanical properties, the metal die features, and the process parameters affect the dimensions of the wax pattern. Some important effective process parameters are the injection ...
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