scholarly journals Innovative Approaches to Increase Service Life of Poplar Lightweight Hardwood Construction Products

2020 ◽  
Author(s):  
J. Acker ◽  
X. Jiang ◽  
J. Bulcke
Keyword(s):  
Service Life ◽  
Construction Products ◽  
Increase Service Life ◽  
Innovative Approaches

FORCE CONDITIONS OF TRANSITION TO ONE-ZONE PROCESS OF BACKWARD SLIP DURING COLD ROLLING OF STRIPS

2020 ◽  
pp. 45-53
Author(s):  
L.S. Kokhan ◽  
◽  
A.V. Aldunin ◽  
Keyword(s):  
Service Life ◽  
Cold Rolling ◽  
Considerable Decrease ◽  
Steel Strips ◽  
Increase Service Life

Results of analytical researches of power parameters of cold rolling of thin and average steel strips with a back tension are presented. Considerable decrease in average relative tension on a surface of contact with rolling rolls upon transition is established from two-zonal to one-zonal rolling of lag. It allows to increase service life of rolling rolls.

scholarly journals A METHOD FOR OPTIMIZING CHEMICAL COMPOSITION OF STEELS TO REDUCE RADICALLY THEIR ALLOY ELEMENTS AND INCREASE SERVICE LIFE OF MACHINE COMPONENTS

2017 ◽  
Vol 1 ◽  
pp. 3-12
Author(s):  
Nikolai Kobasko
Keyword(s):  
Chemical Composition ◽  
Service Life ◽  
Alloy Element ◽  
Steel Grades ◽  
Computer Calculations ◽  
Increase Service Life ◽  
Quenched Steel ◽  
Chemical Composition Of Steel ◽  
Compressive Residual Stresses ◽  
Strength And Ductility

A method for optimizing chemical composition of steel is proposed and a correlation is established to reduce cardinally alloy elements in existing steel grades that results in high compressive residual stresses at the surface of intensively quenched steel parts and increasing strength and ductility of material due to super- strengthening phenomenon. The algorithm of optimization consists in reducing alloy elements in existing alloy steel in 1.5 – 2 times and then lowering step-by-step content of steel, beginning from the most costly alloy element and ending the most cheaper one, until established correlation is satisfied. The range of reduction is minimal and during computer calculations can be chosen as 0,001wt%. The proposed approach can save alloy elements, energy, increase service life of machine components and improve environmental condition. The method is a basis for development of the new low hardenability (LH) and optimal hardenability (OH) steels.

Hartwalzen von Lagerringen zur Lebensdauersteigerung/Hard rolling of bearing rings to increase service life

2020 ◽  
Vol 110 (06) ◽  
pp. 368-374
Author(s):  
Kirk Jahnel ◽  
Sebastian Hähnel ◽  
Tim Grunwald ◽  
Thomas Bergs
Keyword(s):  
Service Life ◽  
Rolling Process ◽  
Rolling Bearings ◽  
Development Fund ◽  
European Regional Development Fund ◽  
Compressive Stresses ◽  
Fraunhofer Institute ◽  
Increase Service Life ◽  
Bearing Rings ◽  
European Regional

Zur Steigerung der Lagerlebensdauer von Hybridwälzlagern hat das Fraunhofer Institut für Produktionstechnologie IPT gemeinsam mit Cerobear GmbH, Hegenscheidt-MFD (A Member of the NSH-Group) und Schmitz-Metallographie GmbH an der Qualifizierung und Implementierung des Verfahrens Hartwalzen in die Prozesskette zur Herstellung von Hybridwälzlagern gearbeitet. Durch die Induzierung von Druckeigenspannungen in die Lagerlauffläche konnte die Lebensdauer nachweislich erhöht werden. Die Arbeiten wurden im Rahmen des geförderten Forschungsvorhabens „Hartwalzen von Lagerringen“ durchgeführt, das aus Mitteln des europäischen Fonds für regionale Entwicklung (EFRE) gefördert wurde.   To increase the service life of hybrid rolling bearings, the Fraunhofer Institute for Production Technology IPT together with Cerobear GmbH, Hegenscheidt-MFD (A Member of the NSH Group) and Schmitz-Metallographie GmbH successfully qualified and implemented the hard rolling process in the process chain for manufacturing hybrid rolling bearings. By inducing residual compressive stresses in the bearing running surface, the service life has been demonstrably increased. The work was carried out as part of the funded research project „Hard Rolling of Bearing Rings“, which was supported by the European Regional Development Fund (EFRE).

scholarly journals Welding materials used to increase service life of agricultural machinery processing soil

2018 ◽  
Vol 244 ◽  
pp. 01002
Author(s):  
Petr Hrabě ◽  
Viktor Kolář ◽  
Abraham Kabutey ◽  
Aleš Sedláček
Keyword(s):  
Service Life ◽  
Abrasive Wear ◽  
Soil Treatment ◽  
Agricultural Machinery ◽  
Wear Resistant ◽  
Welding Material ◽  
Increase Service Life ◽  
Materials Used ◽  
Welding Materials

Intensive abrasive wear occurs in soil-treatment machines. This article is focused on increasing the service life of ploughs by the welding material. The welding material is applied at a 45° angle to the tool. This material is abrasive wear resistant. The welding material was applied parallel to the head of ploughshares with spacing of 60 mm. Carbide materials were used (SK 258 TiC-O, SK 900-O, SK A43-O, SK 299- O, SK A45-O, OK TUBRODUR 15.82, SK 258 TiC-O). The tested ploughshare variants were wearing the same when were used the welding material and the standard.

scholarly journals IMPROVING WORK RESOURCE OF SAFETY EQUIPMENT FOR EUTECTIC COATING

2020 ◽  
Vol 20 ◽  
pp. 36-40
Author(s):  
T. Berezhanskyi ◽  
Ya. Moshkola
Keyword(s):  
Service Life ◽  
Low Cost ◽  
Fire Fighting ◽  
Eutectic Coating ◽  
Emergency Rescue ◽  
Life Saving ◽  
Urgent Task ◽  
Increase Service Life ◽  
Working Bodies ◽  
Cr System

Today, in Ukraine, fire-fighting and rescue units in the event of fires and emergencies of a natural and anthropo-genic nature are often forced to operate emergency life-saving tools and equipment that are partially worn or outdated. It is extremely costly to completely replace the equipment of all fire and rescue units. Therefore, the development of methods for the restoration of worn or partially worn parts of fire and rescue equipment, as well as increasing their service life and interrepair interval, is an urgent task for today.The proposed work is devoted to the application of eutectic coatings based on the Fe-Mn-C-B-Si alloy Cr system for the restoration of partially wornout steel parts of firefighting equipment and rescue equipment, as well as to increase the service life (lifetime) of these parts. The essence of the experimental study was to compare the wear of the cutting elements of hydraulic emergency rescue scissors "Hydrum H-32" series production and scissors with a protective eutectic coating. The work life of the eutectic coatings of Fe-Mn-C-B-Si doped Cr working bodies of emergency rescue scissors in 1.8 times greater than that of working bodies of serial production, so it is advisable to repair such worn parts of the rescue and fire tool. Due to the relatively low cost of eutectic alloys based on iron, this method is economically viable as an alternative to replacing parts with new ones. This type of coating can also be applied to other steel parts of fire-fighting and rescue equipment to restore worn parts and increase service life and overhaul intervals. The use of durable eutectic iron based coatings is economically feasible given their relatively low cost.

Impact of Hydrophobic Additives on Properties of Clay Plaster

2016 ◽  
Vol 824 ◽  
pp. 92-99
Author(s):  
Barbora Lišková ◽  
Petr Jelínek ◽  
Milan Ostrý
Keyword(s):  
Service Life ◽  
Significant Role ◽  
Indoor Climate ◽  
Indoor Temperature ◽  
Hydrophobic Materials ◽  
Increase Service Life ◽  
Cost Efficient ◽  
The Stability ◽  
Mixture Samples

Use of clay plasters in the exterior forces owners to conduct frequent maintenance of the plaster’s surface, which may be damaged by the weather. This paper describes partial results of the research, which strives to develop cost-efficient hydrophobic additives to increase service life of exterior clay plasters. We have chosen 7 hydrophobic materials and added them to the reference prefabricated plaster mixture. Samples of the enhanced plaster were tested to evaluate the additives’ impact on the overall mechanical, thermal and moisture characteristics of the plaster. Long-term testing of the best hydrophobic additives will follow to verify their properties in real buildings. Clay plasters play a significant role for the healthy indoor climate due to the influence on the stability of the indoor temperature and humidity.

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