Abstract
Yüksek dayanımlı çeliklerin büküm işlemlerinde
geri esnemenin hassas bir şekilde ölçülebilmesi gereklidir. İstenen son şekil
tamamen geri esnemenin miktarına bağımlıdır. Geri esnemedeki yanlış bir tahmin,
bükme kuvveti hesabında da yanlışlıklara neden olacaktır. Bu nedenle, özellikle
yüksek dayanımlı çeliklerde, geri esneme açıları deneysel çalışmalarla
doğrulanmalıdır. Bu çalışmada, yüksek mukavemetli çeliklerde bükme açılarının
yük altında ve yük kalktıktan sonra belirlenmesini içermektedir. Deney düzeneğinde
bir video kamera ile tüm büküm prosesi boyunca numunenin görüntüleri kaydedilmiştir.
Daha sonra, özel bir Matlab kodu ile bu görüntüden, parçanın, pres alt ölü
noktadayken (maksimum yük anı) ve pres tamamen kalktıktan sonraki (geri esneme
sonrası) açılarını belirlemek için görüntü işleme metodu kullanılmıştır. Sonuçlar
hem sayısal simülasyonlarla kıyaslanmıştır.
References
- [1] Billur, E., Çetin, B., Gürleyik, M., (2016), “New Generation Advanced High Strength Steels: Developments, Trends and Constraints”, International Journal of Scientific and Technology Research, Vol.2 (1), pp 50-62.
- [2] Mulidran, P., Spisak, E., Majernikova, J., Yang S.Y., (2017), “The International Journal of Engineering and Science”, Vol.6 (9), pp 49-52.
- [3] Billur, E. And Altan, T., (2012), “Servo-driven presses for AHSS Stamping”, Stamping Journal, Nov. Dec. Issue, pp 12-13.
- [4] Zhang, M., Zhang, J., Ning, Y.X., Wang, T., Wan, Z., (2013), “Springback Behavior of Advanced High Strength Steel (AHSS) CP800,” Metallic Materials and Manufacturing Technology”, Vol.820, pp 45-49.
- [5] Yang, X., Choi, C., Sever, N.K., Altan, T., (2016), “Prediction of Springback in Air-bending of AHSS (DP780) Considering Young’s Modulus Variation and with A Piecewise Hardening Function”, International Journal of Mechanical Sciences, Vol.105, pp. 266-272
- [6] Seo, K.Y., Kim, J.H., Lee, H.S., Kim, J., Kim, B.M., (2017), “Effect of Constitutive Equations on Springback Prediction Accuracy in the TRIP1180 Cold Stamping”, Metals, Vol. 8, pp.18
- [7] MatLab & Simulink Users’ Manual.
- [8] Billur, E., Çetin, B., Yılmaz, M.M., Oğuz, A.G., Atay, A., Ersoy, K., Uğuz, R.O., Kaftanoğlu, B., “Forming of New Generation AHSS Using Servo Presses”, Proceedings of 5th International Conference on Accuracy in Forming Technology (ICAFT 2015), pp. 175-192.
Abstract
Precise
determination of the spring-back angle plays an important role in bending of
high strength steels (HSS). Since the desired final geometry is totally
dependent on the amount of spring-back; any under-estimation would result also
in an under-estimation of the bending force. For that reason, especially in the
modelling of HSS bending the spring-back should be verified with experimental
studies. This contribution deals with the determination of the spring-back
angle in HSS bending operations. To accomplish this, a simple set-up was designed
and with the aid of a digital camera the bending process was recorded. A MATLAB
script was designed which uses image processing approach for the determination
of the angles from the images at the bottom dead center (BDC, i.e., at maximum
punch force) and the final position (i.e., after springback). Results were compared
with FEA based simulations.
References
- [1] Billur, E., Çetin, B., Gürleyik, M., (2016), “New Generation Advanced High Strength Steels: Developments, Trends and Constraints”, International Journal of Scientific and Technology Research, Vol.2 (1), pp 50-62.
- [2] Mulidran, P., Spisak, E., Majernikova, J., Yang S.Y., (2017), “The International Journal of Engineering and Science”, Vol.6 (9), pp 49-52.
- [3] Billur, E. And Altan, T., (2012), “Servo-driven presses for AHSS Stamping”, Stamping Journal, Nov. Dec. Issue, pp 12-13.
- [4] Zhang, M., Zhang, J., Ning, Y.X., Wang, T., Wan, Z., (2013), “Springback Behavior of Advanced High Strength Steel (AHSS) CP800,” Metallic Materials and Manufacturing Technology”, Vol.820, pp 45-49.
- [5] Yang, X., Choi, C., Sever, N.K., Altan, T., (2016), “Prediction of Springback in Air-bending of AHSS (DP780) Considering Young’s Modulus Variation and with A Piecewise Hardening Function”, International Journal of Mechanical Sciences, Vol.105, pp. 266-272
- [6] Seo, K.Y., Kim, J.H., Lee, H.S., Kim, J., Kim, B.M., (2017), “Effect of Constitutive Equations on Springback Prediction Accuracy in the TRIP1180 Cold Stamping”, Metals, Vol. 8, pp.18
- [7] MatLab & Simulink Users’ Manual.
- [8] Billur, E., Çetin, B., Yılmaz, M.M., Oğuz, A.G., Atay, A., Ersoy, K., Uğuz, R.O., Kaftanoğlu, B., “Forming of New Generation AHSS Using Servo Presses”, Proceedings of 5th International Conference on Accuracy in Forming Technology (ICAFT 2015), pp. 175-192.
Details
| Primary Language | Turkish |
|---|---|
| Journal Section | Araştırma, Geliştirme ve Uygulama Makaleleri |
| Authors | |
| Publication Date | December 30, 2019 |
| Submission Date | January 25, 2019 |
| Published in Issue | Year 2019 Volume: 17 Issue: 1 |
