scholarly journals Forming analysis of steel ball bearings made with warm skew rolling

2020 ◽  
Vol 54 (3) ◽  
pp. 417-422
Author(s):  
Y. Huo ◽  
T. He ◽  
B. Wang ◽  
Z. Zheng ◽  
W. Yang ◽  
...  
Keyword(s):  
Steel Ball ◽  
Ball Bearings ◽  
Forming Analysis ◽  
Skew Rolling

Optimization of Pass Parameters on Two-Grooves Skew Rolling for Al Ball

2009 ◽  
Vol 419-420 ◽  
pp. 313-316 ◽  
Author(s):  
Xiao Min Shi ◽  
Bao Jian Wang ◽  
Zhen Hua Li
Keyword(s):  
Continuous Casting ◽  
Practical Experience ◽  
Refining Process ◽  
Steel Ball ◽  
Die Design ◽  
Secondary Refining ◽  
Skew Rolling

The optimization of pass parameters is an important step in skew rolling design. In order to meet the demands of secondary refining process in continuous casting, on the basis of the practical experience of two-groove skew rolling for steel ball, and by means of the theory of two-groove skew rolling design ,the optimization of two-groove pass parameter for Φ21.6 mm Aluminum ball, a kind of additive in secondary refining process, is realized. The optimized pass parameters are used in the rolling die design, and the corresponding experiments indicate that the projects of optimized pass parameters are feasible, and the efficiency of two-groove skew rolling is twice as large as that of one-groove.

scholarly journals Penile strangulation by multiple steel ball bearings: desperate situation-desperate measures

2018 ◽  
pp. bcr-2018-227586
Author(s):  
Iqbal Singh ◽  
Dhirendra Suman ◽  
Sanjay Gupta ◽  
Gaurav Garg
Keyword(s):  
Steel Ball ◽  
Ball Bearings ◽  
Penile Strangulation

The Performance of Ball Bearings With Silicon Nitride Ceramic Balls in High Speed Spindles for Machine Tools

1988 ◽  
Vol 110 (4) ◽  
pp. 693-698 ◽  
Author(s):  
Hirotoshi Aramaki ◽  
Yoshio Shoda ◽  
Yuka Morishita ◽  
Takeshi Sawamoto
Keyword(s):  
Silicon Nitride ◽  
Temperature Rise ◽  
Machine Tools ◽  
High Speed ◽  
Low Cost ◽  
Steel Ball ◽  
Ball Bearings ◽  
Grease Lubrication ◽  
Frictional Loss ◽  
High Speeds

Two types of angular contact ball bearings for machine tools having steel rings and silicon nitride balls were tested and the temperature rise was compared with that of conventional steel ball bearings with grease lubrication and oil-air lubrication as well. Experimental results indicated that the temperature rise of silicon nitride ball bearings was much lower than that of steel ball bearings at high speeds. Calculations made using a computer demonstrated that the reduction of gyroscopic moments and centrifugal forces acting on balls because of the low density of silicon nitride resulted in about 30 to 50 percent less frictional loss at high speeds even with low-cost lubrication such as grease or oil-air.

Wear Resistance and Interlocking Properties of AISI 5200 Steel Ball Bearings Coated by Nanocomposites

2015 ◽  
Vol 6 (3) ◽  
pp. 471 ◽  
Author(s):  
Winarto Winarto ◽  
Dedi Priadi ◽  
Nofrijon Sofyan ◽  
Martinus Adi Anggoro
Keyword(s):  
Wear Resistance ◽  
Steel Ball ◽  
Ball Bearings

scholarly journals Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface

1984 ◽  
Vol 30 (104) ◽  
pp. 123-125 ◽  
Author(s):  
Jennifer M. Smith
Keyword(s):  
Glass Surface ◽  
Rolling Bearing ◽  
Pressure Variation ◽  
Steel Ball ◽  
Ball Bearings ◽  
Direction Of Movement ◽  
Rock Interface

AbstractMacClintock (1953) has suggested that arcuate features formed on glass by the impression of steel ball bearings may be analogous to crescentic gouges observed on formerly glaciated rock surfaces. He noted that cracks, convex in the direction of movement, are formed as bearings roll over a glass surface but not as they slide over it. MacClintock therefore proposed that the similarly orientated crescentic gouges may owe their origin to abrading clasts rolling along a glacier bed. This note describes simple experiments designed to test this view by generating friction cracks artificially. Cracks convex and concave in the direction of movement were produced by a non-rolling bearing — a result apparently incompatible with MacClintock’s proposal. It is suggested that the orientation of such cracks is less dependent on bearing rotation and more the result of pressure variation. Cracks analogous to crescentic gouges may form as a result of unloading.

scholarly journals Experiments Relating to the Fracture of Bedrock at the Ice-Rock Interface

1984 ◽  
Vol 30 (104) ◽  
pp. 123-125
Author(s):  
Jennifer M. Smith
Keyword(s):  
Glass Surface ◽  
Rolling Bearing ◽  
Pressure Variation ◽  
Steel Ball ◽  
Ball Bearings ◽  
Direction Of Movement ◽  
Rock Interface

AbstractMacClintock (1953) has suggested that arcuate features formed on glass by the impression of steel ball bearings may be analogous to crescentic gouges observed on formerly glaciated rock surfaces. He noted that cracks, convex in the direction of movement, are formed as bearings roll over a glass surface but not as they slide over it. MacClintock therefore proposed that the similarly orientated crescentic gouges may owe their origin to abrading clasts rolling along a glacier bed. This note describes simple experiments designed to test this view by generating friction cracks artificially. Cracks convex and concave in the direction of movement were produced by a non-rolling bearing — a result apparently incompatible with MacClintock’s proposal. It is suggested that the orientation of such cracks is less dependent on bearing rotation and more the result of pressure variation. Cracks analogous to crescentic gouges may form as a result of unloading.

scholarly journals Internal Friction of Ball Bearings at Very Low Temperatures

2020 ◽  
Vol 66 (4) ◽  
pp. 235-242
Author(s):  
Jakub Sikorski ◽  
Witold Pawlowski
Keyword(s):  
Internal Friction ◽  
Liquid Nitrogen ◽  
Low Temperatures ◽  
Zirconium Oxide ◽  
Graphite Powder ◽  
Steel Ball ◽  
Ball Bearings ◽  
Molybdenum Disulphide

Results of the study on the internal friction of steel ball bearings made of X65Cr14 alloy and ceramic bearings made of zirconium oxide operating at temperatures lowered by liquid nitrogen down to –195 °C are presented in this paper. Standard grease added by the manufacturer, while graphite and molybdenum disulphide powder were used for lubrication of the bearings during the measurements. Tests were also carried out to examine the performance of the bearings operating without lubrication. The power of bearing internal friction versus temperature was measured. The lowest bearing internal friction was observed for molybdenum disulphide, whose effective lubricating performance was verified for both types of ball bearings. Graphite powder was almost equally effective with the advantage of being suitable for use in machines that come into contact with food.

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