Thermal stabilization equipment for dimensional heat treatment of bearing rings

1992 ◽  
Vol 34 (5) ◽  
pp. 313-323 ◽  
Author(s):  
V. A. Golichenko
Keyword(s):  
Heat Treatment ◽  
Thermal Stabilization ◽  
Bearing Rings

Technology of Residual Stresses Relaxation by the Ultrasonic Vibrations

2015 ◽  
Vol 770 ◽  
pp. 66-69 ◽  
Author(s):  
Albert V. Korolev ◽  
Andrew A. Korolev ◽  
A.S. Jakovichin ◽  
S.A. Savran ◽  
A.F. Balaev ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Liquid Medium ◽  
Thermal Stabilization ◽  
Geometrical Parameters ◽  
Ultrasonic Vibrations ◽  
New Techniques ◽  
Special Machine ◽  
Bearing Rings

The paper studies the effectiveness of new techniques of stabilizing the geometrical parameters of bearing rings in comparison with the thermal stabilization. Processing of bearing rings is made on a special machine in a liquid medium where the ultrasonic vibrations are excited. It is shown that roundness of the rings after ultrasonic stabilization is substantially lower than after the heat treatment.

scholarly journals Comparision of the bearing rings deformation after heat treatment

2020 ◽  
Vol 20 (5) ◽  
pp. 677-683
Author(s):  
Dana Stancekova ◽  
Anna Rudawska ◽  
Jozef Mrázik ◽  
Filip Turian
Keyword(s):  
Heat Treatment ◽  
Bearing Rings

Analysis of Cutting Parameters Influence on the Machined Surface Roughness Obtained by Turning of a Heat Treated Bearing Steel

2015 ◽  
Vol 809-810 ◽  
pp. 195-200
Author(s):  
Constatin Rotariu ◽  
Sevasti Mitsi ◽  
Dragos Paraschiv ◽  
Octavian Lupescu ◽  
Sergiu Lungu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Surface Roughness ◽  
Hard Turning ◽  
Cutting Parameters ◽  
Bearing Steel ◽  
Machined Surface ◽  
Heat Treated ◽  
Machined Surface Roughness ◽  
Bearing Rings ◽  
Quality Surface

In this paper we analyze the influence of cutting parameters on the surface quality, surface roughness respectively, processed by turning when heat treated bearing steel, also called hard turning, and processing by turning of bearing steel without heat treatment. We set parameters of the cutting regime influencing the achievement of roughness surfaces which must be within the predetermined requirements if bearing rings exceeding 500 mm in diameter. This analysis will be done by statistical methods using the software Minitab 14.

Experimental Investigation of Residual Stresses after Heat Treatment and Grinding Processes in the Production of Ball Bearing Rings

2008 ◽  
Vol 571-572 ◽  
pp. 27-32 ◽  
Author(s):  
Volkan Güley ◽  
A. Erman Tekkaya ◽  
Turhan Savaş ◽  
Feridun Özhan
Keyword(s):  
Heat Treatment ◽  
Experimental Investigation ◽  
Residual Stresses ◽  
Process Parameters ◽  
Treatment Process ◽  
Ball Bearing ◽  
Grinding Process ◽  
Heat Treatment Process ◽  
Grinding Processes ◽  
Bearing Rings

Experimental investigation of residual stresses after heat treatment and grinding processes in the production of ball bearing rings has been carried out. The residual stresses were measured by X-ray diffraction method utilizing chromium radiation, which has an average penetration depth of 5 μm incident on 100Cr6 (AISI-E52100) ball bearing steel. The process parameters of heat treatment and grinding processes were varied so as to represent the extreme values that can be applied in the respective processes. Hardness and percent retained austenite limit the heat treatment process parameters; while roundness, surface roughness and form the grinding process. Tensile surface residual stresses on the raceway of ball bearing rings changes to compression after grinding in both circumferential and axial directions. In grinding relatively higher compressive stresses were measured in axial direction compared to the circumferential direction. This experimental investigation also showed that the influence of heat treatment process parameters on the magnitude and distribution of residual stresses survived even after grinding process; i.e. heat treatment and grinding processes cannot be evaluated independently in process design for favourable residual stresses.

scholarly journals Effect of Polyacrylonitrile Precursor Orientation on the Structures and Properties of Thermally Stabilized Carbon Fiber

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3237
Author(s):  
Bin Wang ◽  
Chenggao Li ◽  
Weiyu Cao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Fiber ◽  
Yield Strength ◽  
Thermal Stabilization ◽  
Precursor Fiber ◽  
Orientation Degree ◽  
Stabilization Process ◽  
Orientation Structure ◽  
Pan Fibers

The thermal stabilization process of polyacrylonitrile (PAN) precursor fiber was the key step to prepare high-performance carbon fiber. During the thermal stabilization process, the aggregation structure and the reactivity of molecular chains have significant effects on the microstructures and mechanical properties of carbon fiber. In the present paper, the effects of the orientation structure of PAN precursor fiber on the thermal stabilization reaction and the mechanical properties of carbon fiber were experimentally studied. Using multi-dimensional structural and mechanical properties tests, such as XRD, DSC, 13C NMR and Instron machine testing, the crystalline and skeleton structure, exothermic behavior, and tensile properties of PAN precursor fiber with different orientations in the process of thermal stabilization were characterized to reveal the relationship between microstructure evolution and tensile properties. The results showed that the orientation structure of PAN precursor fiber had an obvious effect on the thermal stabilization process and the tensile stress–strain characteristic. When the heat treatment temperature was lower than 200 °C, the crystallinity and crystallite size of PAN fibers with higher orientation degrees increased significantly. After sufficient thermal stabilization, the original PAN precursor fiber with a higher orientation degree could form more aromatic lamellar structures and showed better regularity. Furthermore, the yield strength and initial modulus of the fibers with a higher orientation degree increased due to the formation of more aromatic rings. The maximum increase in the percentages of yield strength and tensile modulus of the PAN fibers were achieved when the heat-treated temperature was 200 °C, and the percentage values were 138.4% and 158.7% compared to the precursor without heat-treatment. In addition, the elongation at break of the fibers with a higher orientation degree was also relatively larger.

Manufacturing Residual Stress States in Heat Treatment Simulation of Bearing Rings

2006 ◽  
Vol 37 (1) ◽  
pp. 52-57 ◽  
Author(s):  
H. Surm ◽  
O. Kessler ◽  
F. Hoffmann ◽  
H.-W. Zoch
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Stress States ◽  
Bearing Rings

Compensation of roundness deviations of bearing rings by heat treatment

2012 ◽  
Vol 43 (1-2) ◽  
pp. 48-55 ◽  
Author(s):  
J. Lütjens ◽  
H. Surm ◽  
M. Hunkel ◽  
H. Gafsi ◽  
V. Renken ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Bearing Rings

Effects of Thermal Stabilization and Electron Beam Irradiation on the Characteristics of Lignin Extracted from Black Liquor

2017 ◽  
Vol 381 ◽  
pp. 64-68
Author(s):  
Dae Kyun Hwang ◽  
Jeong Ho Kim ◽  
Oh Hyeong Kwon ◽  
Won Ho Park ◽  
Dong Hwan Cho
Keyword(s):  
Heat Treatment ◽  
Electron Beam ◽  
Industrial Waste ◽  
Electron Beam Irradiation ◽  
Treatment Process ◽  
Black Liquor ◽  
Thermal Stabilization ◽  
Heat Treatment Process ◽  
Beam Irradiation ◽  
Stabilization Process

In the present work, lignin extracted from black liquor, which is industrial waste of pulp manufacturing. The extracted lignin was irradiated at various electron beam intensities from 100 to 1000 kGy. Also, the extracted lignin was thermally stabilized by heat treatment process. The characteristics of the stabilized and irradiated lignin materials were examined by means of TGA, ATR-FTIR, EA, and SEM. The ATR-FTIR result shows that both stabilized and irradiated lignin samples exhibit the decrease of characteristic absorption peaks, indicating the presence of guaiacyl and syringyl groups in the lignin structure. It reveals that the irradiation done to the ‘as-extracted’ lignin with appropriate electron beam intensity provides an efficiency as thermal stabilization of the lignin, suggesting that electron beam irradiation may apply directly to the extracted lignin, prior to carbonization the lignin without thermal stabilization process.

scholarly journals Inorganic Photocatalytic Enhancement: Activated RhB Photodegradation by Surface Modification of SnO2 Nanocrystals with V2O5-like species

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Mauro Epifani ◽  
Saulius Kaciulis ◽  
Alessio Mezzi ◽  
Davide Altamura ◽  
Cinzia Giannini ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Oleic Acid ◽  
Thermal Stabilization ◽  
Structural Transformations ◽  
Chemical Purification ◽  
Sno2 Nanocrystals ◽  
Heat Treated ◽  
Mixed Oxidation ◽  
Mean Size ◽  
Surface Modified

Abstract SnO2 nanocrystals were prepared by precipitation in dodecylamine at 100 °C, then they were reacted with vanadium chloromethoxide in oleic acid at 250 °C. The resulting materials were heat-treated at various temperatures up to 650 °C for thermal stabilization, chemical purification and for studying the overall structural transformations. From the crossed use of various characterization techniques, it emerged that the as-prepared materials were constituted by cassiterite SnO2 nanocrystals with a surface modified by isolated V(IV) oxide species. After heat-treatment at 400 °C, the SnO2 nanocrystals were wrapped by layers composed of vanadium oxide (IV-V mixed oxidation state) and carbon residuals. After heating at 500 °C, only SnO2 cassiterite nanocrystals were obtained, with a mean size of 2.8 nm and wrapped by only V2O5-like species. The samples heat-treated at 500 °C were tested as RhB photodegradation catalysts. At 10−7 M concentration, all RhB was degraded within 1 h of reaction, at a much faster rate than all pure SnO2 materials reported until now.

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