Temat: lathe - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: FEA-analysis of shaft and supports deformations for huge precise lathe. Statics and resonances
Autorzy:: Dounar, Stanislau
Lakimovitch, Alexandre
Ausiyevich, Andrei
Jakubowski, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/27315928.pdf
Data publikacji:: 2018
Wydawca:: STE GROUP
Tematy:: tokarka
MES
wirnik
linia środkowa
rezonans
lathe
FEA
rotor
centerline
resonance
Opis:: Load bearing system simulation is provided for a huge lathe to be renovated. Static and modal analyses are done by FEM. Focus was centerline rising, needed for larger rotor shaft machining. Forces between shaft and three supports were applied. Shaft static stiffness is lowered at 1.15 times only for 600 mm centerline rising. Supports have lost its rigidity at 1.42 times. Concrete pouring into bed cavities is recommended for supports flexibility limitation such as tailstock reinforcement. Robustness of bottom resonances is revealed both for rotor shaft (14.5-18.2 Hz) and supports (42.7-55.4 Hz). Centerline rising is allowed on 300 mm at least. It gives possibility to machine extremely large (up to ø2750 mm) shafts.
Źródło:: New Trends in Production Engineering; 2018, 1, 1; 341-348
2545-2843
Pojawia się w:: New Trends in Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining
Autorzy:: Onysko, Oleh
Kopei, Volodymyr
Medvid, Iulia
Panchuk, Vitalii
Pituley, Lolita
Vryukalo, Viktor
Powiązania:: https://bibliotekanauki.pl/articles/2064355.pdf
Data publikacji:: 2019
Wydawca:: STE GROUP
Tematy:: drill string
back rake angle
tool-joint tapered thread
pitch diameter
lathe tool
przewód wiertniczy
gwint stożkowy
średnica podziałowa
nóż tokarski
Opis:: The drill string consists of connected drill pipes and other elements. The connection is carried out by screwing of the drill string elements with the help of tool-joint tapered thread. The operational characteristics of the drill pipes depend of the manufacture precision of these tool-joints mostly. The accuracy of the thread is regulated by the accuracy of its profile and the accuracy of its pitch diameter value. The accuracy of the tapered thread manufacturing on the lathe in its depending on the values of the geometric parameters of the lathe tool and the values of deviations of its installation relatively to the workpiece axis is investigated. It is proved that for the tapered thread of form VI profile used for connection of drill pipes with the diameter from 30 mm to 44 mm the most influential factor, in relation to the accuracy of the thread profile is the value of the rake angle. Application of the rake angle value up to -5° according to the research data leads to a deviation from the specified profile of 0.3°, which is more than 35% of the declared standard tolerance on deviations from the profile. Also, the influence of the back rake angle value on the value of the deviation from the standard pitch diameter of the thread is proved. It is proved that the magnitude of the tangential displacement of the nose of the cutter relatively to the axis of the thread up to -0.2 mm can cause a deviation of the profile angle of 0.18°, which is 27% of the standard tolerance.
Źródło:: New Trends in Production Engineering; 2019, 2, 1; 268--276
2545-2843
Pojawia się w:: New Trends in Production Engineering
Dostawca treści:: Biblioteka Nauki

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