scholarly journals Steel quality of rolling contact bearings produced by different manufacturers, used for mining equipment instrumentation

2021 ◽  
Vol 315 ◽  
pp. 03019
Author(s):  
Aleksandr Korotkov ◽  
Lidiya Korotkova ◽  
Stefan Voeth ◽  
Roman Solentsov
Keyword(s):  
Quality Control ◽  
Negative Impact ◽  
Bearing Steel ◽  
Operating Conditions ◽  
Rolling Contact ◽  
Mining Equipment ◽  
Operating Life ◽  
Premature Failure ◽  
Steel Quality

Severe operating conditions of mining equipment have a negative impact on the operating life of the rolling contact bearings used in such equipment. The main reasons for the premature failure of rolling contact bearings include, first of all, poor quality of the bearing steel as delivered and the defects of their subsequent heat treatment. The abovementioned reasons result in splitting of bearings, metal shelling and appearance of potholes on their tracks, as well as intense abrasive wear. Nevertheless, despite the importance of this issue, the quality of bearing steel, either as delivered or in finished bearings, is usually not under control.To solve this problem, the quality of bearing steel was studied, exemplified by the bearings of the Russian, Swedish (SKF) and Japanese (NSK) manufacturers, i.e., main suppliers of rolling contact bearings for mining equipment in Russia. The problem of bearing steel quality control was solved by developing a quality control methodology that took into account the state of the metal after metallurgical treatment and at the stage of bearing production. Based on this methodology, the main types of bearing steel defects affecting the mechanism of bearing failure are identified.It is found that the bearing steel quality of domestic manufacturers is highly competitive with foreign counterparts. A method of nondestructive control is also proposed for detecting possible microstructure defects in bearings, either as delivered or while in operation.

Near-Race Ultrasonic Inspection of Tapered Roller Bearing Components for Non-Metallic Defects

2012 ◽  
Author(s):  
Lucas Koester ◽  
Joseph A. Turner ◽  
Craig Zuhlke ◽  
Dennis Alexander ◽  
Brent Wilson ◽  
...  
Keyword(s):  
Surface Wave ◽  
Rolling Contact Fatigue ◽  
Ultrasonic Inspection ◽  
Roller Bearing ◽  
Contact Fatigue ◽  
Production Method ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Premature Failure ◽  
Scanning Method

Bearing steel cleanliness is directly linked to failures caused by the interaction of subsurface defects and rolling contact fatigue (RCF). Optical analysis of as-received steel coupled with ultrasonic inspection on finished components minimizes the occurrence of defects in the near race. While useful as a preventative measure, these methods do not ensure that critical areas of components subjected to RCF are free of defects that act as stress concentrators and contribute to premature failure. This presentation provides a brief summary of the current technology and standards utilized in the industry. The deficiencies of the current methods for the particular case at hand are identified and a surface wave scanning method is introduced. The development and production of reference parts for this type of scanning are then discussed. The production method entails both traditional electro-discharge machining (EDM) and femtosecond laser machining (FLM) on finished bearing components such that the reference part microstructure resembles that of a finished part. Experimental results utilizing surface wave scanning are given for two types of assembly-ready bearing components that are then subjected to realistic service loads and mileage to the point of failure. The results of the service life simulations are then correlated with surface wave scanning results and are shown to be in good agreement. This work is anticipated to impact any field in which components are subjected to RCF.

Conrod Bearings With an Optimized Narrow Circumferential Oil Groove: Simulated Durability Improvement for Heavy-Duty Applications

2015 ◽  
Vol 137 (10) ◽  
Author(s):  
Konstantinos Kalogiannis ◽  
David R. Merritt ◽  
Omar Mian ◽  
Hugh Gibson
Keyword(s):  
Negative Impact ◽  
Elastohydrodynamic Lubrication ◽  
Design Feature ◽  
Operating Conditions ◽  
Temperature Dependent ◽  
Operating Life ◽  
Oil Film ◽  
Significant Temperature ◽  
Bearing Design ◽  
Engine Crankshaft

Under normal operating conditions, engine crankshaft bearings experience variations in oil film temperature due to shearing of the oil film. This can have a negative impact on the bearing operating life since the viscosity of the lubricant is temperature dependent. In the current study, a thermo-elastohydrodynamic lubrication (TEHL) analysis has been conducted using an in-house specialized simulation package called (software for analysis of bearings in reciprocating engines) SABRE-TEHL. This advanced simulation tool has been used to optimize a new bearing design feature leading to a significant temperature reduction, which in turn increases the robustness of the system.

Increasing the Durability of Roller-electrodes in Electrocontact Surfacing of Parts of Mobile Agricultural and Transport Equipment

2020 ◽  
pp. 133-139
Author(s):  
Viktor Dubovyk ◽  
◽  
Yurii Nevdakha ◽  
Viktor Pukalov ◽  
Vlvdyslav Chernov ◽  
...  
Keyword(s):  
Welded Joint ◽  
Negative Impact ◽  
Operating Conditions ◽  
Motor Vehicles ◽  
Transport Equipment ◽  
Repair Costs ◽  
Negative Effect ◽  
Hot Rolled ◽  
Traction Power

During the operation of mobile agricultural and motor vehicles, their connections and parts are activated. This leads to a decrease in traction power, operating speed, quality and productivity when performing technological operations. Repair costs are constantly rising, so the question of finding inexpensive technologies for the restoration of worn parts is relevant. Such technologies include electro-contact surfacing. One of the reasons that constrains the widespread use of the method of electrocontact surfacing is the low stability of the electrode roller. Currently, little research has been conducted to study the wear of the electrode rollers and increase their wear resistance. The research on search of ways of increase of durability of rollers-electrodes at electrocontact surfacing is carried out. The operating conditions of the electrode rollers and their operation, the strength of the welded joint when using a tool with different degrees of operation were considered. The operation of the roller-electrode during electro-contact surfacing has a negative effect on the strength of the welded joint of the metal coating with the base due to the reduction of deformation of the filler wire. The results of tests for operation show that a significant reduction in the quality of the welded joint occurs when using electrodes made of hot-rolled copper after 1.5...2 hours of operation. It is not possible to fully compensate for the negative impact of the electrode operation on the quality of the welded joint by adjusting the technological modes of surfacing. This indicates the need for 2 - 3 times the replacement of such tools, after grooving their working surfaces on a lathe. Developed recommendations for the choice of sizes of rollers-electrodes used in electro-contact surfacing of parts of mobile agricultural and transport equipment.

scholarly journals DEVELOPMENT OF THE METHOD OF NON-DESTRUCTIVE QUALITY CONTROL OF HARDENED CYLINDER SLEEVE OF AUTOTRAKTOR EQUIPMENT

2021 ◽  
Vol 295 (2) ◽  
pp. 275-277
Author(s):  
B. BRATSLAVETS ◽  
Keyword(s):  
Quality Control ◽  
Base Metal ◽  
Piston Ring ◽  
Operating Conditions ◽  
Dust Particles ◽  
Chemical Corrosion ◽  
Gaseous Products ◽  
Working Surface ◽  
Non Destructive

The main part of tractor engines is the cylinder liner, which depends on the life of the machine as a whole. It is made of gray cast iron (SCh20 DSTU 1412-85) with the addition of alloying elements and subjected to the working surface of HDTV hardening. Now quality control is carried out by destructive methods (assessment of hardness, durability, structure) on specially cut templates on 1 piece. from a party to 80-100 pieces of each melting. Such control does not ensure the reliability of products, both in the quality of the base metal and heat treatment. The solution to this problem is possible by developing non-destructive quality control of each product in different periods of the process process with assessment of the properties and stress level of both the base metal (corresponding to the outer surface) and the hardened layer (inner working surface). The intensity of cylinder wear depends on the conditions of friction of the cylinder-piston ring, which are affected by the design features of the engine (power, speed, compression ratio, cooling system, as well as fuel supply and combustion, air and oil purification system), quality of fuel and oil, operating conditions and wear resistance of the cylinder material. Wear of cylinders during friction paired with a piston ring during engine operation occurs as a result of a combination of many processes occurring simultaneously: destruction of microprojections of surfaces that are destroyed by repeated plastic deformation during engagement, as well as the destruction of tired origin; setting of the material of the microprojections with subsequent deep tearing of the metal particles during the destruction of the setting unit; accumulation of abrasive particles that contribute to the intensification of wear; abrasive action of dust particles, contribution products, solid inclusions on the surface of collapsing bodies; chemical corrosion under the influence of high temperatures of gaseous products of fuel combustion; electro-chemical corrosion from the action of acids formed during the dissolution of gaseous products in condensed water vapor on the walls of the cylinders.

Paper 4: Study of the Effect of Material Combination and Hardness in Rolling Contact

1965 ◽  
Vol 180 (11) ◽  
pp. 32-36 ◽  
Author(s):  
D. Scott ◽  
J. Blackwell
Keyword(s):  
High Speed ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Material Combination ◽  
Premature Failure ◽  
Contact Fatigue Life ◽  
En 31 ◽  
Steel Balls

Because of uneven stressing, environment, or lubricant effects, one element of a rolling mechanism may be prone to premature failure, and it has been found in some instances that the seemingly easy solution of replacing the element with one manufactured in a superior material has not been successful. By means of the simple rolling four-ball test, the effect of the combination of material in rolling contact has been studied. The effect on the incidence of rolling-contact fatigue of running different materials such as high-speed tool steels, stainless steels, and other wear resistant materials potentially suitable for rolling elements against one another and against conventional En 31 ball-bearing steel has been explored. The effect of various hardness combinations of En 31 steel balls has been determined. The choice of material combination is shown to be a major factor in enhancing or reducing the performance of either mating material. With En 31 steel there appears to be an optimum hardness range and the hardness of both surfaces is important to ensure a maximum rolling-contact fatigue life. Metallurgical investigations have been carried out to elucidate the mechanisms of failure, and ‘compatibility’ is discussed in the light of fundamental concepts of the initiation of surface fatigue by mechanisms such as reversed micro-plastic deformation and how these mechanisms, the contact area, and the stress distribution are influenced by the material properties such as hardness and by rolling and sliding action.

Conrod Bearings With an Optimized Narrow Circumferential Oil Groove: Simulated Durability Improvement for Heavy-Duty Applications

2014 ◽  
Author(s):  
Konstantinos Kalogiannis ◽  
David Merritt ◽  
Omar Mian ◽  
Hugh Gibson
Keyword(s):  
Negative Impact ◽  
Elastohydrodynamic Lubrication ◽  
Design Feature ◽  
Operating Conditions ◽  
Temperature Dependent ◽  
Operating Life ◽  
Oil Film ◽  
Significant Temperature ◽  
Bearing Design ◽  
Engine Crankshaft

Under normal operating conditions, engine crankshaft bearings experience variations in oil film temperature due to shearing of the oil film. This can have a negative impact on the bearing operating life since the viscosity of the lubricant is temperature dependent. In the current study, a thermo-elastohydrodynamic lubrication (TEHL) analysis has been conducted using an in-house specialized simulation package called SABRE-TEHL. This advanced simulation tool has been used to optimize a new bearing design feature leading to a significant temperature reduction, which in turns increases the robustness of the system.

Development and Application of Quality Control System for Highway Subgrade Construction

2019 ◽  
Vol 2 (5) ◽  
Author(s):  
Tong Wang
Keyword(s):  
Quality Control ◽  
Real Time ◽  
Detection Method ◽  
System Development ◽  
Effective Control ◽  
Construction Process ◽  
Development Mode ◽  
The Road ◽  
Whole Process

The compaction quality of the subgrade is directly related to the service life of the road. Effective control of the subgrade construction process is the key to ensuring the compaction quality of the subgrade. Therefore, real-time, comprehensive, rapid and accurate prediction of construction compaction quality through informatization detection method is an important guarantee for speeding up construction progress and ensuring subgrade compaction quality. Based on the function of the system, this paper puts forward the principle of system development and the development mode used in system development, and displays the development system in real-time to achieve the whole process control of subgrade construction quality.

Sign in / Sign up

Export Citation Format

Share Document