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NON-DESTRUCTIVE CONTROL OF A HYDRAULIC HAMMER PISTON, DESIGNED FOR GEOLOGICAL EXPLORATION ACTIVITIES
Kamelia Kalchevska
Institute of metal science,
equipment and technologies with hydro and aerodynamics centre "Akad. A. Balevski,
Bulgarian Academy of Sciences 67 Shipchenski prohod, 1574 Sofia, Bulgaria
БЕЗРАЗРУШИТЕЛЕН КОНТРОЛ НА БУТАЛО ОТ ХИДРАВЛИЧЕН ЧУК, ПРЕДНАЗНАЧЕНА
ЗА ГЕОЛОГО-ПРОУЧВАТЕЛНИ ДЕЙНОСТИ
Камелия Калчевска
Abstract. The piston part provided to us by the Bulgarian company to clarify the reason for its breakage. Keywords: steels, non-destructive testing, macrostructure
1.Standards used in peer review:
1.BS EN 13018:2016 Non-destructive testing. Visual testing. General principles Released: 2016-02-29; 2.BS EN 13927:2003 Non-destructive testing. Visual testing. Equipment, 2003;
3. BS ISO 5579:2013 Non-destructive testing — Radiographic testing of metallic materials using film and X- or gamma rays — Basic rules;
4. ISO 3452-1:2013 Non-destructive testing — Penetrant testing — Part 1: General principles;
5.ISO 3452-2:2013(en) Non-destructive testing — Penetrant testing — Part 2: Testing of penetrant materials;
6.BS EN 10228-2:2016 Non-destructive testing of steel forgings. Penetrant testing;
7.ISO 23277:2015 Non-destructive testing of welds — Penetrant testing- Acceptance levels;
8.ISO 10675-1:2016 Non-destructive testing of welds — Acceptance levels for radiographic testing — Part 1: Steel, nickel, titanium and their alloys;
9.EN ISO 17637:2016 Non-destructive testing of welds - Visual testing of fusion-welded joints;
10. EN 1371-2:2015 Liquid penetrant testing - Part 2: Investment castings.
2.1. Test method:
1.2. Visual inspection according to standards [1], [2]. No defects in the base metal, as well as surface staining are observed.
2.2. Material - after the spectral analysis it was found that the sample is made of steel type 40Ch2N2MA.
Analog to DIN 1.6565 40NiCrMo 6.
Analog: Japanese brand JAPAN JIS № G 4103 steel grade SNCM8 of type.
The rolled product made of the above-mentioned material with $160mm and in the range of 100 ^ 400 mm is with subsequent heat treatment of the forging-hardening 850 oC in oil and annealing at 610o C, which allows a part made with additional machining to be loaded to energy impact 5120 J according to the provided documentation.
Figure 1 Broken piston- FUROKA WAFigure 2 Drawing of the piston by documentation, item 8
2.3 After the performed radiographic control according to the current standards BDS EN ISO [3] and [8], Figures 3 and 4 show the found inadmissible pores and voids A> 10%.
Fig. 3
Fig. 4
Fig.5 Analysis with penetrating liquids
1-cluster of pores in the area of the fracture and an initial crack with a length of about 35 mm
2-cracks min 15 pieces with lengths between 1.5 and 12 mm
3-single pores with dimensions between 0.5 and 2 mm
4-pores and a crack measuring about 9 mm
3. Conclusion-The FUROKAWA FXJ 275 hydraulic hammer part was broken due to the large number of cracks inside the forging, as well as pores and cracks at two diametrically opposite ends, leading to the formation and development of a highway crack.
Literature
1.БДС EN 13018-03 Визуален контрол . Общи положения;
2.БДС EN 13927-03 Визуален контрол. Изисквания;
3. БДС EN ISO 5579:2013 Изпитване (контрол) без разрушаване. Радиографично изпитване на метални материали с използване на филм чрез рентгеново и гама лъчение. Основни правила;
4.БДС EN ISO 3452-1:2013 Изпитване (контрол) без разрушаване. Изпитване с проникващи течности. Част 1: Общи принципи;
5.БДС EN IS03452-2:2013 Изпитване (контрол) без разрушаване. Изпитване с проникващи течности. Част 2: Изпитване на материали за изпитване с проникващи течности;
6.БДС ISO 10228-2:2016 Изпитване (контрол) без разрушаване на стоманени изковки. Част 2: Изпитване с проникващи течности;
7. БДС EN ISO 23277:2015 Изпитване с проникващи течности. Нива на приемане.
8.БДС EN ISO 10675-1:2017 Изпитване без разрушаване на заварени съединения. Нива на приемане при радиографично изпитване. Изпитване без разрушаване на заварени съединения;БДС EN ISO 17637:2016Визуално изпитване на заварени чрез стопяване съединения.
Kamelia Kalchevska Assoc.Prof. Ph.D, PT, RT,VT, Expert in X-ray flaw detection at the Institute of Metallurgy, Equipment and Technologies with the Center for Hydro- and Aerodynamics "Acad. Angel Balevski
All equipment and experimental units used in this work was funded by the European Regional Development Fund within the OP "Science and Education for Smart Growth 2014 - 2020", project CoE "National center of mechatronics and clean technologies", № BG05M2OP001-1.001-0008-C08.
УДК 629.44. 083 (571.63)
К ВОПРОСУ МОДЕРНИЗАЦИИ ПРОЦЕССА ПОГРУЗКИ УГЛЯ НА СТАНЦИЯХ
Лаптева И.И.
Дальневосточный государственный университет путей сообщения,
Хабаровск, Россия, 89625017763 Карнаков Е.А.
Дальневосточный государственный университет путей сообщения,
Хабаровск
ОN THE ISSUE OF MODERNIZATION OF THE COAL LOADING PROCESS AT THE STATIONS
Lapteva I.I.
Far Eastern State of Transport University, Khabarovsk, 89625017763 Karnakov E.A. Far Eastern State of Transport University,
Khabarovsk
Аннотация. Рассматриваются проблемы, возникающие при перевозке угля по железной дороге со станции Новый Ургал, с предложением модернизации процесса погрузки, так как на существующих типах полувагонах или открытых контейнерах происходит выдувание из них угольной пыли и, как следствие, наблюдается загрязнение окружающей среды вокруг железной дороги.
Abstract. The problems arising during the transportation of coal by rail from the Novy Urgal station are considered, with a proposal to modernize the loading process, since coal dust is blown out of them on existing types of gondola cars or open containers and, as a result, pollution of the environment around the railway is observed.
Ключевые слова: угольная пыль, полувагоны, контейнеры, загрязнение окружающей среды, железная дорога.
Keywords: coal dust, gondola cars, containers, environmental pollution, railway.
