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Separation of Forged Steel Connecting Rods and Caps by Fracture Splitting
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English
Abstract
Separation of the rods and caps of integrally hot-forged steel connecting rods by fracture splitting has not been possible with current alloys because the fracture is accompanied by too much ductility to permit accurate rejoining. A development effort was undertaken to devise an alloy which could be cracked with minimal distortion, while maintaining good machinability and adequate fatigue strength. The resulting alloy, upon air-cooling from the forging temperature, develops a microstructure which is essentially all pearlite. Impact tests and rod cracking experiments show that fracture of the new alloy occurs with less distortion than fracture of SAE 1151, a steel with a ferrite-pearlite microstructure. Machinability of the new alloy is comparable to SAE 1151 of the same hardness. Fatigue tests indicate that the new alloy is comparable in strength to current production alloys.
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Authors
Citation
Olaniran, M. and Stickels, C., "Separation of Forged Steel Connecting Rods and Caps by Fracture Splitting," SAE Technical Paper 930033, 1993, https://doi.org/10.4271/930033.Also In
References
- Weber M. “Cost Effective Finishing of Powder Forged Connecting Rods with the Fracture-Splitting-Method” SAE Tech. Paper 910157 1991
- Just E. “New Formulas for Calculating Hardenability Curves” Metal Progress Nov. 1969 87 88
- Little R. E. Manual on Statistical Planning and Analysis for Fatigue Experiments 1975
- Kuratomi H. Uchino M. Kurebayashi Y. Namiki K. Sugiura S. “Development of Lightweight Connecting Rod Based on Fatigue Resistance of Microalloyed Steel” SAE Tech. Paper 900454 1990
- Olaniran M. Stickels C. A. August 4 1992