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The effect of crack propagation on the quality of fineblanking surface of cold-rolled steel sheet detected by PVDF film stress sensors

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Abstract

In order to find out whether 100% clean-cut surface can be prepared after crack formation in the shear zone, contact stress was measured by PVDF film stress sensors on the cold-rolled medium-carbon steel sheet surface in the fineblanking processes. Characteristics of contact stress was revealed by comparing the outputs of the FB processes with the maximum and minimum blank-holder force, which prepared 100% clean-cut surface respectively. Penetration depth of the punch in the sheet increased with the number of times of the FB proesses. And the microstructure evolution in the shear zone was observed by scanning electron microscopy (SEM). Local fluctuations in the sensor output indicated the crack ever propagated in the shear zone during the sheet punching process. The crack tip hardened zone and pre-existing microcracks in front of the crack tip caused the crack deflection. The crack path formed a protuberance which was then extruded by the die corner to continue forming clean-cut surface until the end. Microhardness of the cut surface first increased and then decreaed because of the crack propagation, whereas the exponential increase in microhardness occurred in the case that no crack initiated.

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Acknowledgments

The authors are grateful for the financial supported by the National Natural Science Foundation of China (No. 51605488 and No. 11702326). The research was carried out in School of Mechanical Engineering of Xi’an Jiaotong University.

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Authors and Affiliations

  1. Air and Missile Defense College, Air Force Engineering University, No.1 Changle Road, Xi’an, Shaanxi, 710051, People’s Republic of China

    Ri-xian Ding, Wei Wang, Fu-jing Tang, Yan-nian Zhou & Jun-hong Duan

  2. Northwest Institute of Mechanical & Electrical Engineering, Xianyang, People’s Republic of China

    Jun-hang Guo

  3. Science College, Air Force Engineering University, Xi’an, People’s Republic of China

    Lei-lei Yan

Authors
  1. Ri-xian Ding
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  2. Wei Wang
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  3. Fu-jing Tang
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  4. Yan-nian Zhou
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  5. Jun-hang Guo
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  6. Jun-hong Duan
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  7. Lei-lei Yan
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Correspondence to Fu-jing Tang.

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Ding, Rx., Wang, W., Tang, Fj. et al. The effect of crack propagation on the quality of fineblanking surface of cold-rolled steel sheet detected by PVDF film stress sensors. Int J Adv Manuf Technol 99, 1615–1625 (2018). https://doi.org/10.1007/s00170-018-2564-y

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  • DOI: https://doi.org/10.1007/s00170-018-2564-y

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