Experimental study of residual stresses relaxation in ring details during multicyclic loading

Balayev

Vasin

2019

MSF

The paper describes a cause of the geometric accuracy degradation of slender metallic products during their operation, which consists in the relaxation of residual stresses accumulated while product manufacturing. The most promising technology among the existing technologies of residual stress relaxation is based on the use of vibromechanical vibrations. This technology has high performance and low energy consumption. The reason for the relaxation of residual stresses under the action of vibromechanical vibrations is the gradual accumulation of internal energy, which leads to plastic dislocation shifts upon reaching a critical level. The dislocation motion under the action of vibromechanical vibrations continues until the dislocations take a more compact layout that corresponds to the equilibrium energy state. For technological implementation of the process there was developed a method of ultrasonic stabilization of elastic plates, which serve as sensing elements in differential-pressure transducers. The experimental studies of ultrasonic stabilization are carried out. According to the results of the studies, there have been conducted tests of the microstructure of the control samples. It is established that the samples of steel 20CH13 subject to ultrasonic treatment have a more uniform structure than the samples after the factory technology of long "aging". This confirms the assumption about the structural-energy processes occurring during vibromechanical relaxation of residual stresses. The technology of ultrasonic stabilization can be recommended as a replacement to the "aging" technology on the basis of the obtained results.

Section: Introductionmentioning

confidence: 99%

The Study of the Influence of Ultrasonic Vibrations on Structural Changes of Steel

Balayev

Vasin

2019

MSF

“…Gradual accumulation of the energy leads to occurrence of shear deformation in the material, which is followed by the relaxation of residual stresses. To implement this approach, the authors developed and tested in real production conditions a technological method of treatment of a ring part by continuous running with three rolls [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Relaxation of Residual Stresses in Bearing Rings Based on the Optimal Geometric Setup of Equipment for Centerless Running

Balayev

Iznairov

2019

MSF

This paper discusses the technological method of residual stress relaxation of bearing rings by centerless running with cylindrical rolls. Described a new approach to relieve residual stresses by centerless running of elastically-deforming rolls on the basis of the geometrical setup of the equipment. It was found that geometrical setup of the equipment influences an elastic strain of parts and the degree of residual stress relaxation. We obtained a mathematical model for calculation of setup parameters to ensure the required variation value of elastic strain of the part. The results of experiments confirm the influence of the geometric setup on the magnitude of residual stress relaxation.

“…To implement this approach there was developed a technological method of treatment of a ring part by continuous running with three rollers [15][16]. To calculate rational technological modes of vibromechanical stabilization of geometrical parameters of the bearing rings, we developed a mathematical model [17] of the mechanism of vibromechanical relaxation of residual stresses based on probability-theoretical approach to description of the dislocation shear strain [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effectiveness of the Vibromechanical Stabilization of Bearing Rings

Balaev

2018

SSP

The paper provides the comparison of vibromechanical technology for stabilization of bearing rings and thermal tempering on the following parameters: performance, energy consumption, and magnitude of residual stresses after treatment. To assess the effectiveness of residual stress relaxation through the usage of vibromechanical energy, there were conducted experimental studies on a specially designed and manufactured prototype of the equipment. The results of experimental studies show that the energy consumption during vibromechanical stabilization is ten times less, and performance is several times higher than during the thermal tempering. Moreover, vibromechanical stabilization allows more effective residual stresses relaxation. The costs for capital investment can be reduced, as the cost of equipment for vibromechanical stabilization is ten times less than the cost of electric furnaces.