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Browsing by Subject "tool life"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Reduction of die loading by divided flow pattern in the finisher die web area
    (2008) Skubisz, Piotr; Sińczak, Jan; Chyła, Paweł
    Physical and numerical modelling of the forging process of a complex shape axisymmetrical part has been presented. Three different solutions of forging technology have been analysed in order to obtain improvement in the metal flow kinematics in the last stage of forging in finisher die, as well as, favourable distribution of mechanical parameters in workpiece and tools. Improved design of preform produced divided flow pattern in the finisher die, resulting in reduction of loading and stresses in tools.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Theoretical study of dependence of screwing of drilling-pipe connector on thread-process cutting tool profile
    (Wydawnictwa AGH, 2019) Panchuk, Vitalii; Onysko, Oleh; Lukan, Tetiana; Medvid, Iuliia
    Screwing is one of the main parameters of the quality of a drill string tapered thread tool joint. It indicates the number of screwing operations that can be applied to this tool joint during drilling. Tool joints that have undergone rejection (determined by a specific criterion - the distance between the end faces of the pin and the box before they are start the screwing) are not permitted to screw. The value of this criterion is proportional to the working height of the threadprofile, which decreases during operation. In this article, it is offered to increase the initial value of the criterion of rejection due to the increase of the work height of the thread profile. This can be done without violating the standard but with the use of a modernized profile of the tool for thread turning. This profile makes it possible to increase the crest diameter of the thread and at the same time ensure sufficient tool life. Due to its usage, the resource of the tool joint can increase by 9-14.5%, while the cutter's tool life and cost remain unchanged.