Analysis and Detection of Elastic Deformation of the Large-Scale Crankshaft in Non-Circular Grinding

Abstract:

Due to the discontinuous axis and the big ratio of length to diameter, the large-scale crankshaft is easy to generate the complex elastic deformation under the effect of the huge gravity and the clamping force on non-circular grinding machine. The distinctive deformation deteriorates the coaxiality of all the main journals and thus the grinding precision of crankpins in non-circular grinding. In this paper, the statics analysis of large-scale crankshaft has been conducted by using the finite element simulation. The overall deformation of crankshaft and the position offset of each main journal center without or with the auxiliary supports have been simulated and contrasted. The results manifest that the auxiliary support forces produced by the steady rests have the positive effect on the compensation for crankshaft deformation. On this basis, to satisfy the demand of position adjustment of the upper and lower support pads of servo-controlled open steady rest, the on-machine measurement method and device of the position of main journal center is proposed. And then the offset calculation model of the main journal center is deduced using the measured data. The measurement method and device are beneficial for the straightening of the crankshaft and the improvement of machining accuracy of crankpins in non-circular grinding.

• Periodical: Applied Mechanics and Materials (Volume 532)
• Pages: 285-290
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.532.285
• Online since: February 2014
• Authors: Nan Yan Shen*, Jing Li, Xue Dong Wang, Jun Ye, Zhi Xiang Yu
• Keywords: Auxiliary Support, Calculation Model, Elastic Deformation, On-Machine Measurement

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