Experimental Investigation of Mechanical Press Dynamic Behaviors by Ram Displacement Waveform Curves

Abstract:

This paper analyses the measurement demands of the mechanical-press ram displacement waveform on the sample frequency and displacement resolution. A virtual instruction system was developed that contains a USB2069 data acquisition card and a software based LabVIEW, and a Hall sensor sensitizes the displacement especially at the ram bottom dead center (BDC). The paper describes and explains the characteristic behaviors of the ram displacement curve on the macro shape and the micro waveforms of BDC in various shutheights. The discussion indicates that a flat bottom region of BDC waveform is due to the clearance between the transmission devices and the elastic distortion of the press frame, and the position of the punch backward departure is a steady inflexion point, which is the best BDC bottommost position. Based the time of flat BDC region, the clearance values can be calculated.

• Periodical: Applied Mechanics and Materials (Volumes 215-216)
• Pages: 832-836
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.215-216.832
• Online since: November 2012
• Authors: Chun Zhang, Hai Feng Xiao, Ming Wang, Bing Li
• Keywords: Bottom Dead Center (BDC), Dynamic Behavior, Mechanical Press

References

[1] A.j. Zheng, L.m. Yao, X.s. Wang, Measuring of Bottom Center Precision in Mechanical Press, China Metal Forming Equipment & Manufacturing Technology(In Chinese), Vol, 6 (2007), p.22.

[2] K. Hatsukano, T. Sano, K. Matsuno, Dynamic Accuracy of Mechanical Press .2. Comparison of Dynamic Accuracy of Different Presses, Journal of Mechanical Engineering Laboratory, Vol, 46 (1992), p.470.

[3] K. Hatsukano, T. Sano, K. Matsuno, Dynamic Accuracy of Mechanical Press .3. Relation between the Dynamic Behavior of Slide and the Accuracy of Products, Journal of Mechanical Engineering Laboratory, Vol, 48 (1994), p.69.

[4] J. Breitling, D. Wallace, T. Altan, Investigations of different loading conditions in a high speed mechanical press, Journal of Materials Processing Technology, Vol, 59 (1996), p.18.

DOI: 10.1016/0924-0136(96)02282-0

[5] X.j. Lu, W.q. Zhen, H.z. Tian, L.m. LI, Influences of air pressure and rotating speed on bottom dead center of high-speed press, Forging & Stamping Technology(In Chinese), Vol, 1 (2009), p.115.

[6] H.l. Feng, X.j. Lu, The Precision Test Research of the Bottom Dead Center in High-speed Press, China Metal Forming Equipment & Manufacturing Technology(In Chinese), Vol, 3 (2009), p.34.

[7] X.j. Lu, Y. Zhou, J. Sheng, S.a. Zhu, The research of bottom dead center oscillogram for High Speed press, China Metal Forming Equipment & Manufacturing Technology(In Chinese), Vol, 1 (2009), p.22.

[8] X.d. Wang, X.j. Lu, Z. Xiao, X.b. Jin, J.l. Yin, The bottom dead point test and data analysis of high-speed press, China Metal Forming Equipment & Manufacturing Technology(In Chinese), Vol, 2 (2008), p.37.