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Influence of oxide layer on grinding quality in ELID grinding bearing outer ring raceway with workpiece-cathode

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Abstract

Surface quality of workpiece could be significantly improved by ELID grinding. However, ELID grinding bearing outer ring raceway with small inner diameter has small space, which limits installation of electrode. In this work, ELID grinding bearing outer ring raceway acting as cathode is proposed. But electric spark discharge will occur in ELID grinding with workpiece-cathode, which affects grinding quality. The purpose of this work is to investigate formation mechanism of electric spark discharge and influence of oxide layer on grinding quality. A novel experimental method is proposed to study state of oxide layer (mainly thickness and compactness) in ELID grinding bearing outer ring raceway with workpiece-cathode. Experimental results show that electric spark discharge occurs with thick oxide layer (characterized by control current), resulting in corroded pits on surface of oxide layer and workpiece in ELID grinding with workpiece-cathode. With increased control current, surface of oxide layer becomes smooth. Moreover, grinding force increases with increased control current. When control current is 0.5 A, surface roughness of workpiece is the largest. And surface roughness of workpiece increases with increased control current, as control current is greater than or equal to 1 A. The results are helpful to apply ELID to grind bearing outer ring raceway and improve ELID grinding performance.

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Abbreviations

E :

Voltage of power supply

R p :

Resistance of protective resistance

R s :

Resistance of matrix of wheel

R o :

Resistance of oxide layer

R w :

Resistance of workpiece

I :

Current

R :

Resistance of material

E 1 :

Electric field intensity

φ :

Scalar potential

ρ :

Resistivity of material

L :

Length of material

S :

Sectional area of material

ρ o :

Resistivity of oxide layer

h :

Thickness of oxide layer

S o :

Sectional area of oxide layer

d :

Gap between anode and cathode

ρ 1 :

Density of the charge body

ε :

Dielectric constant of medium

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Acknowledgments

The authors would like to acknowledge to the National Natural Science Foundation of China (Contract no. 51675377) and Tianjin application foundation and advanced technology research project (Contract No.15JCZDJC39500 & No.18JCZDJC10050) for providing the financial support to complete this work.

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Authors and Affiliations

  1. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, 300350, China

    Zhiqiang Wang, Chengzu Ren, Guang Chen, Xiaofan Deng & Chunhui Ji

  2. Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin, 300222, China

    Zhiqiang Wang

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  1. Zhiqiang Wang
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  2. Chengzu Ren
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  3. Guang Chen
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Correspondence to Chengzu Ren.

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Wang, Z., Ren, C., Chen, G. et al. Influence of oxide layer on grinding quality in ELID grinding bearing outer ring raceway with workpiece-cathode. Int J Adv Manuf Technol 105, 3045–3056 (2019). https://doi.org/10.1007/s00170-019-04475-7

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  • DOI: https://doi.org/10.1007/s00170-019-04475-7

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