Estimation of the tooth gear service life by wear under misalignment conditions

2021 ◽  
pp. 3-9
Author(s):  
F.G. Nakhatakyan
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Contact Pressure ◽  
Tooth Gear ◽  
Wear Life ◽  
Approximate Estimation ◽  
Life Engagement ◽  
Gear Wheels

A method of approximate estimation of the life of a tooth gear by the wear of the teeth of gear wheels in the presence of a misalignment is proposed. The dependences of the of the tooth gear life on loading, formulas for determining the maximum wear and contact pressure are obtained. Keywords tooth gear, wear, life, engagement, misalignment, wear resistance. [email protected]

scholarly journals Investigation of performance properties of rubber with metal fillers

2021 ◽  
pp. 20-23
Author(s):  
S. V. Pashukevich ◽  
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Contact Zone ◽  
Laboratory Tests ◽  
The Body ◽  
Body Of Revolution ◽  
Hydraulic Systems ◽  
Rubber Mixture ◽  
Fine Powders ◽  
Positive Results

The work conducts laboratory tests on the rubber of the first group of GOST 8752-70 with the introduction of the metal components. The filler is introduced into the rubber mixture on laboratory rollers. Fine powders of copper (Cu), tin (Sn) and lead (Pb) are used as fillers. The dependences of the temperature in the contact zone of the sample and the body of revolution on the concentration of the filler and the dependence of wear on the concentration of the filler for the same loads and sliding speeds are obtained, the fillers that give the rubber the greatest wear resistance are revealed, and the rational amount of the filler is determined. The positive results of laboratory tests give grounds to recommend various equipment including aerospace equipment for use in sealing devices of hydraulic systems, rubber products with metal fillers in the indicated concentrations, which will extend their service life and increase their reliability

scholarly journals Effect of Heat Treatment on the Microstructure and Properties of Ultrafine WC–Co Cemented Carbide

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1302
Author(s):  
Zhongnan Xiang ◽  
Zhanjiang Li ◽  
Fa Chang ◽  
Pinqiang Dai
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Service Life ◽  
Treatment Process ◽  
Cutting Conditions ◽  
Cemented Carbide ◽  
Cemented Carbides ◽  
Heat Treatment Process ◽  
Microstructure And Properties ◽  
Ultrafine Grained

In this paper, the effect of heat treatment on the microstructure and properties of a 0.8 μm WC–10%Co ultrafine cemented carbide was studied. The results show that the microstructural differences in ultrafine WC–Co cemented carbides without and with heat treatment are mainly reflected in the Co phase. For conventional cemented carbides, the hardness and wear resistance can be increased only at the expense of the toughness and strength. An ultrafine-grained WC–Co cemented carbide with good hardness and toughness can be obtained by strengthening the Co phase through an appropriate heat treatment process, and the service life of the ultrafine-grained WC–Co cemented carbide can be improved under actual cutting conditions.

Service life extension for rock cutters by increasing wear resistance of holders by thermomechanical treatment

2019 ◽  
pp. 67-71 ◽  
Author(s):  
V. I. Bolobov ◽  
◽  
S. A. Chupin ◽  
V. S. Bochkov ◽  
I. I. Mishin ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Thermomechanical Treatment ◽  
Life Extension ◽  
Service Life Extension

Effects of TiO2 sol on the microstructure and properties of Au–Co coatings

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744028
Author(s):  
See Leng Tay ◽  
Jowin Van Vliet ◽  
Yuxin Wang ◽  
Fengyan Hou ◽  
Chao Xiong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Wear Resistance ◽  
Service Life ◽  
Surface Morphology ◽  
Electrical Contacts ◽  
Alloying Element ◽  
Plating Bath ◽  
Short Service Life ◽  
Tio2 Sol

Gold (Au) coatings are widely used for electrical contacts in devices, decoration and jewelry. However, the relatively low hardness and poor wear resistance of pure Au coatings lead to a short service life and limit their application. Ni is frequently used as an alloying element to enhance the hardness but it lowers the conductivity of Au coatings. In this research, Co was co-deposited as an alloying element with Au to improve its mechanical properties while maintaining conductivity. TiO2 sol in different concentrations was added to the Au–Co plating bath to further enhance the coating strength. Systematic studies including surface morphology, hardness, wear resistance and electrical conductivity have been carried out. Key results from nanoindentation tests demonstrated that the hardness of Au–Co–TiO2 composite coating was increased by 30% when compared to a pure Au–Co coating, while the electrical conductivity has been kept at the same level.

The Abrasive Resistance Study about the Cutting Picker 40Cr of Coal Cutter

2013 ◽  
Vol 387 ◽  
pp. 227-230
Author(s):  
Ning Zhang ◽  
Shu Chen Wang ◽  
Na Shi ◽  
Hao Chen
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Service Life ◽  
Labor Intensity ◽  
Surface Wear ◽  
Work Efficiency ◽  
Abrasive Resistance ◽  
Treatment Processes ◽  
Mining Capacity

The cutting pick is primarily used in footing excavation such as coal mining and roadway excavation, so the performance of cutting tooth directly affect the mining capacity, the driving efficiency, and the service life of the tool. The quality of domestic mining pick is lower than that abroad, especially the tooth body wear of the whole shearer picks accounts for half of its overall failure. Thus tooth body 40Cr was treated by various heat treatment processes in this experiment, so as to improve the hardness and wear resistance of cutting tooth, analysis the surface wear scar of morphology, research the wear mechanism, that made for reducing the consumption of cutting tooth, improving work efficiency, and easing the labor intensity of workers undergound.

scholarly journals Evaluation of Material Wear and Self-Welding in Sodium-Cooled Reactor Systems

1959 ◽  
Vol 81 (2) ◽  
pp. 213-225 ◽  
Author(s):  
R. B. Jerman ◽  
R. C. Williams ◽  
D. O. Leeser
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Liquid Sodium ◽  
Static Loads ◽  
Bearing Couple ◽  
Material Wear

Laboratory and prototype component tests were made to determine the degree of adhesion and self-welding of various bearing-couple materials in liquid sodium. A few tests were run in nitrogen and in argon. Temperatures were from 500 F to 1000 F and the static loads on the bearing surfaces were up to 10,000 psi. The harder materials showed better wear resistance generally than did the softer materials. However, each material has a service life depending upon the temperature, unit loads, nature of service, and environment.

scholarly journals EFFICIENCY OF HARDENING OF METALLURGICAL EQUIPMENT SPARE PARTS BY HARD ALLOY

2019 ◽  
Vol 61 (12) ◽  
pp. 939-947
Author(s):  
V. А. Bystrov
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Service Life ◽  
Hard Alloy ◽  
Solid Particle ◽  
Thermal Stresses ◽  
Spare Parts ◽  
Solid Particles ◽  
High Temperature Wear ◽  
Hardening Process

Composite  materials  (CM)  are  widely  used  for  hardening  of  wearing parts operating at high temperature wear types. They are based  on  high-melting  hard  alloys,  as  which  are  used  carbides  of  transition  metals  of  IV – VI  groups A  determining  the  physics  of  high-temperature wear. For these purposes baked TiC of TN 20 type on the basis  of (Ti, Mo)C – Ni – Mo is used that has a ring structure preventing the  formation of complex alloyed structures on the bounda ry of solid particle-matrix. Due to the minimal solubility of the sintered hard alloy of  TN 20 type in the alloy-bond, at the interface of solid particle – matrix  practically does not stand out complex structural phases causing embrittlement and growth of residual thermal stresses and strains. It leads  to increased wear resistance and longer service life of hardened parts.  In order to increase the opera ting efficiency of metallurgical units due  to  hardening  of  spare  parts  with  a  composite  material  based  on  sintered hard alloy of the TN 20 type using electroslag surfacing (ESW),  a comprehensive program has been developed to control the efficiency  of hardening parts. In the management of hard alloy surfacing the special  attention  is  given  to  heat  and  high  temperature  wear  resistance  determined  by  the  set  of  CM  properties  of  solid  particles.  Therefore,  maintaining of high mechanical, thermal and energy characteristics of  carbides and decrease of the solubility of solid particles in a CM matrix  at surfacing is a priority for improving efficiency in hardening process  of spare parts. Integrated ESW management program for CM is based  on  effects,  aimed  to  prevent  the  formation  of  complex  alloyed  structures on surface of the solid section of particle-matrix; to reduce thermal stresses and deformations (leading to the cracks formation, chipping and deleting solid particles in abrasive wear) and to improve high  temperature wear resistance. Use of the developed control systems for  hardening  process  of  metallurgical  equipment  wearing  parts  has  significantly  increased  the  service  life  of  spare  parts  and  producti vity  of  the metallurgical units, which ensured a certain economic effect.

scholarly journals THE INFLUENCE OF TECHNOLOGICAL PARAMETERS OF LASER SURFACING ON THE PROPERTIES OF NiCrBSiC-WC COMPOSITES

2018 ◽  
Vol 13 (4) ◽  
pp. 58-66
Author(s):  
A. E. Zatoka ◽  
D. V. Drobot ◽  
S. P. Merchev ◽  
S. V. Nevezhin ◽  
A. S. Gerasimov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Tungsten Carbide ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Tungsten Carbides ◽  
Technological Parameters ◽  
Carbide Composite ◽  
Measurement While Drilling ◽  
Mechanical And Service Properties

It was investigated the influence of technological parameters of laser cladding on the thickness of the carbide composite coatings with similar composition and properties of matrix and different types of reinforcing inclusions (spherical tungsten carbides (WC) and recycled carbides). Special attention is paid to physical-mechanical and service properties of the composites such as hardness and resistance to abrasive wear. It is established that the thickness of the carbide composite coatings increases with increasing laser power and flow rate of the carrier gas, and with decreasing speed of the laser and the step of cladding. The study showed that at the addition of 50 wt.% WC matrix has smaller hardness values 540-560 HV, which allows to obtain the structure of the carbide composite coatings without cracks. At the same time, at addition of 80 wt.% WC matrix has higher hardness 670 HV, which does not provide the structure without cracks. Resistance of composites NiCrBSiC-WC to cracking, as well as their wear resistance, increases with increasing content of tungsten carbide. The wear resistance of the coatings received from powder Technicord 655-SL, with a reinforcement by recycled carbide, comparable to that for coatings from spherical tungsten carbide Tekmat WC-125. Coatings NiCrBSiCWC, obtained by laser cladding, are used to increase the service life of the equipment telemetering systems, in particular, it is possible to prevent of abrasion and provide of increasing the service life of the contact pads of the equipment for measurement while drilling.

scholarly journals Self-Grinding Silage Knife Strengthened with Ni–WC Alloy Prepared by Laser Cladding

2021 ◽  
Vol 11 (21) ◽  
pp. 10236
Author(s):  
Lingfeng Xu ◽  
Zhanhua Song ◽  
Mingxiang Li ◽  
Fade Li ◽  
Jing Guo ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Impact Toughness ◽  
Laser Cladding ◽  
Cutting Tools ◽  
Field Tests ◽  
Working Environment ◽  
Wear Resistant ◽  
Dense Microstructure ◽  
The Impact

The working environment of agricultural cutting tools is poor, and the operational quality and efficiency are reduced after they become blunt. This study aimed to develop a high wear-resistant agriculture knife with a long life. A Ni–WC alloy, wear-resistant layer was prepared using laser cladding technology on one side of the cutting edge of a 65 Mn silage knife. A self-grinding edge was formed when the cladded knife was used, which improved the cutting quality and service life of the knife. The microstructure, phase, composition, and hardness distribution of the cladding layer were detected and analyzed. The impact toughness and wear resistance of the laser-cladded samples were analyzed, and the cladded knife was tested in the field. The results show that a cladded layer with a dense microstructure formed metallurgical bonds with the substrate. The microhardness was uniform across the cladded layer, and the average hardness of the micro Vickers was approximately 1000 HV(0.2), which was approximately three times the hardness of the substrate. The impact toughness and wear resistance of the coated knife were obviously higher than those of uncoated knives. The field tests showed that compared with a conventional 65 Mn knife, the self-grinding knife with laser cladding could maintain its sharp cutting shape after operation for 76 h, which greatly extended the service life of the knife. This study improved the service life of an agricultural cutting tool, which enhanced the cutting performance and efficiency at the same time.

scholarly journals Wear issues of pumping units

2021 ◽  
Vol 264 ◽  
pp. 04081
Author(s):  
Oybek Ishnazarov ◽  
Abdusaid Isakov ◽  
Utkir Islomov ◽  
Umirzoq Xoliyorov ◽  
Dilshod Ochilov
Keyword(s):  
Mathematical Model ◽  
Wear Resistance ◽  
Service Life ◽  
Rotation Speed ◽  
Operating Mode ◽  
Factors Influencing ◽  
Pump Shaft ◽  
Pumping Unit ◽  
Pumping Units ◽  
The Mathematical Model

The article presents the possibility of increasing the service life of pumping units. Particular attention is paid to the regulation of the speed of rotation of the pumping unit. There are some assumptions in the mathematical model that do not affect the final result. The factors influencing the operating mode are given. It is indicated that the speed of rotation of the pump shaft significantly affects the wear resistance of the pump blades. Thus, the regulation of the pump rotation speed will rationally increase its service life.

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