Zobrazeno 1 - 10
of 191
pro vyhledávání: '"L. Valko"'
Publikováno v:
Механика машин, механизмов и материалов, Iss 1(62), Pp 5-10 (2023)
The reliability and durability of gears in most cases depend on the contact endurance of the material of the parts. Analysis of the stress state of surface-hardened gears has shown that under contact loading, the source of primary damage can be locat
Externí odkaz:
https://doaj.org/article/ce576124d61848f4a3f826c4bc4d66b9
Publikováno v:
Litʹë i Metallurgiâ, Vol 0, Iss 3, Pp 64-69 (2022)
Recalculation formulae of hardness transformation in units of HRC into Vickers hardness HV 30 for hardened and tempered structural steels in ASTM E 140-07 and ISO 18265:2013 were analyzed. From a Vickers hardness reading of 62.3 HRC using a 4.903 N i
Externí odkaz:
https://doaj.org/article/4a56583cceb94a04a41e179dc8d061fc
Publikováno v:
Механика машин, механизмов и материалов, Iss 3(60), Pp 61-67 (2022)
The methods are considered for determining the effective thickness of the hardened layer of metal parts listed in the standards STB 2307-2013 and STB ISO 18203-2019. The ambiguity of interpretation of the concept of effective thickness hэф of the h
Externí odkaz:
https://doaj.org/article/97320edca303449286a0ecf77034992b
Autor:
Sergei P. Rudenko, Aleksandr L. Valko
Publikováno v:
Механика машин, механизмов и материалов, Iss 2(59), Pp 47-53 (2022)
Laws of fatigue resistance changes of surface-hardened toothed gears are established. It is shown that the main criterion of serviceability of gear wheels of transmissions of power-saturated machines is deep contact pitting of active surfaces of teet
Externí odkaz:
https://doaj.org/article/591ed9b36cc74b26b0dd44b88f6f5c02
Publikováno v:
Механика машин, механизмов и материалов, Iss 4(53), Pp 52-59 (2020)
In the world practice of manufacturing gears for automotive equipment, a search is being made for new, more effective steel grades and ways to realize their advantages, achieved both during smelting and during further thermal, deformation and chemica
Externí odkaz:
https://doaj.org/article/01bfb6a338c9401eb2ab68140837cb19
Publikováno v:
Механика машин, механизмов и материалов, Iss 3(52), Pp 71-77 (2020)
Highly stressed transmission parts of energy-saturated machines are made of steels subjected to carburization and subsequent hardening. A low-carbon steel product forms a strong, high-carbon surface layer with a soft and viscous core. An important pa
Externí odkaz:
https://doaj.org/article/7ca094fa034447e6807cb795aeeedfc1
Publikováno v:
Механика машин, механизмов и материалов, Iss 4(49), Pp 61-69 (2019)
Examples of the main types of destruction of highly loaded gears in transmissions of automotive and tractor vehicles are given. Their causes are analyzed. It is established that the criterion for the performance of highly stressed gears of transmissi
Externí odkaz:
https://doaj.org/article/2371ad8363ef4b01905e8ac8576a5e2d
Publikováno v:
Litʹë i Metallurgiâ, Vol 0, Iss 3, Pp 147-152 (2019)
Based on the data on the chemical composition of cemented steels produced according to the European standard EN 10084, the calculation of their hardenability by different methods was carried out. The use of methods is justified by comparing the resul
Externí odkaz:
https://doaj.org/article/6ccacb00e54e4150a29796d1cc376faf
Publikováno v:
Механика машин, механизмов и материалов, Iss 3(48), Pp 51-57 (2019)
The possibility of using standard ASTM A 255–07 is shown to assess the hardenability of structural steels manufactured in accordance with GOST 4543–2016. Inaccuracies of the standard are identified with respect to the correctness of correlation d
Externí odkaz:
https://doaj.org/article/d3d371ccb2794b76a5671a1801c20fa4
Publikováno v:
Механика машин, механизмов и материалов, Iss 1(46), Pp 58-63 (2019)
The results of complex studies of coarse-grained gears made of carburized chromium-nickel steel 20Kh2N4A are presented. It is shown that with the stable operation of thermal equipment fitted with computer-aided systems for automatic control of the pa
Externí odkaz:
https://doaj.org/article/9cd6480e53d04860b13f62a707edf7b0