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Rework solution method on large size radial roller bearings

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Abstract

The aim of this paper is to propose and verify a new rework solution method on large size radial roller bearing. Bearing rework is developing rapidly owing to cost control and greenhouse effect. General rework procedures and rules are evaluated by relative files and executed by most famous bearing suppliers. All defective rolling elements are scrapped according to the existing rework solutions, which leads to tremendous wastage. We draw our attention to the possibility of reusing large size rollers. In the procedure, rolling contact fatigue characteristic of roller bearings is analyzed and the solution method by reusing large size rollers is obtained in the paper. In view of greatly changing the rollers, rolling bearing design method is involved in the new solution method. This is significantly different from the old methods. In addition, the rating life of reworked bearing is re-calculated for reliability.

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Abbreviations

σ max :

Maximum stress, used in fatigue criterion, in newtons per square millimeter

σ :

(Real) stress, used in fatigue criterion, in newtons per square millimeter

P r :

Dynamic equivalent radial load, in newtons

b :

Semi-minor axis of the projected contact ellipse, in millimeter

L we :

Effective roller contact length, in millimeter

z :

Principal direction distance, in millimeter

∑ρ :

Curvature sum, in millimeter

X :

Tangential (over-rolling) direction

Y :

Axial (lateral) direction

Z :

Radial (depth) direction

τ :

Shear stress, in newtons per square millimeter

k 1 :

Variable related to the specific shearing stress

Q max :

Maximum Hertz stress, in newtons per square millimeter

τ x :

(Real) stress refers to X direction, in newtons per square millimeter

τ y :

(Real) stress refers to Y direction, in newtons per square millimeter

τ z :

(real) stress refers to Z direction, in newtons per square millimeter

τ 45 :

Maximum shear stress, in newtons per square millimeter

τ max :

Maximum shear stress, in newtons per square millimeter

σ e v.Mises :

Resulting v. Mises equivalent stress, in newtons per square millimeter

z :

Depth along Z axis at x = 0, y = 0, in millimeter

z max :

Depth to maximum shear stress at x = 0, y = 0, in millimeter

k 2 :

Variable related to the maximum shearing stresses

V :

Stressed volume, m3, (in.3)

Vz :

Stressed volume removed by honing or grinding, m3, (in.3)

V 1 – z :

Remaining stressed volume after honing or grinding, m3, (in.3)

L t :

Race track length, in millimeter

D e :

Raceway diameter of out ring, in millimeter

d i :

Raceway diameter of out ring, in millimeter

D pw :

Pitch diameter of ball or roller set, in millimeters

D we :

Roller diameter applicable in the calculation of load ratings, in millimeters

W :

Number of rollers per bearing row, in piece

G r :

Radial clearance, in millimeter

E :

Circumscribed circle diameter of cylindrical roller bearing, in millimeter

F :

Inscribed circle diameter of cylindrical roller bearing, in millimeter

C 0r :

Basic static radial load rating, in newtons

i :

Number of bearing rows within the assembly, in piece

α :

Bearing half-included outer race angle, in degree

C r :

Basic dynamic radial load rating, in newtons

b m :

Rating factor for contemporary, commonly used, high-quality hardened bearing steel in accordance with good manufacturing practices, the value of which varies with bearing type and design

f c :

Factor, which depends on the geometry of the bearing components, the accuracy to which the various components are made, and the material

C ′ r :

Modified dynamic radial load rating, in newtons

S :

Reliability (probability of survival), in percent

N :

Life, number of stress cycles

L :

Life, number of stress cycles/hours, in millions of revolutions/hours

L 10 :

Basic life with 10 % failure probability (90 % survival), in millions of revolutions

a 1 :

Life modification factor for reliability

a 2 :

Adjustment factor for bearing materials and processing

a 3 :

Adjustment factor for bearing operating conditions including operating profile/mission

a 23 :

Adjustment factor for bearing including interrelationship of material and lubrication effects

L z :

Life of stressed volumes, in number of stress cycles/hours

L 1 − z :

Life of unstressed volumes, in number of stress cycles/hours

L or :

Life of the outer raceway, in hours

L ir :

Life of the inner raceway, in hours

L re :

Life of the rolling element set, in hours

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Acknowledgments

The project was supported by National Natural Science Foundation of China (Grant No. 51475144) and the Foundation of Innovation and Research Team of Science and Technology in Universities in Henan Province (Grant No. 13IRTSTHN025).

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Authors and Affiliations

  1. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, 471003, People’s Republic of China

    Long Chen, Xin-Tao Xia, Hao-tian Zheng & Ming Qiu

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  1. Long Chen
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  2. Xin-Tao Xia
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  3. Hao-tian Zheng
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Correspondence to Long Chen.

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Technical Editor: Fernando Antonio Forcellini.

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Chen, L., Xia, XT., Zheng, Ht. et al. Rework solution method on large size radial roller bearings. J Braz. Soc. Mech. Sci. Eng. 38, 1249–1260 (2016). https://doi.org/10.1007/s40430-015-0364-y

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  • DOI: https://doi.org/10.1007/s40430-015-0364-y

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