This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Improvements on Crankshaft Pin Grinding and Superfinishing Processes
Technical Paper
2017-01-0321
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This case study describes improvements to the pin grinding and superfinishing processes for a 900-mm long, 60-kg forged crankshaft used in a six-cylinder diesel engine.
Machining vibrations caused by the eccentricity of the mass of the pins in relation to the journals increase the difficulty of achieving a stable and capable process. Through analysis of the crankshaft and connecting rod assembly, an opportunity is identified to improve the pin profile along its 30-mm length.
Based on measurements, it is found that, owing to variations of the order of 5 μm, the pin profile (nominally flat) may vary between a concave and a convex shape. Process improvements are focused on the grinding profile.
The amplitude of the grinding profile is established between 0 and 5 μm, tending toward a convex shape. The practical implementation of the proposed improvements involves the imposition of a greater restriction on the extent of the grinding profile to 3.5 μm.
The improvements are based on changes to the following crankshaft manufacturing processes: the steadiness of the journals in semifinish grinding, the dressing frequency and feed rate of the finishing grinding wheel, and the paper grit for superfinishing.
The results of this study and the implementation of the suggested improvements should bring benefits to crankshaft manufacturers and customers, reducing the number of product inspections needed and increasing product robustness.
Authors
Citation
Bastos, S., "Effect of Improvements on Crankshaft Pin Grinding and Superfinishing Processes," SAE Technical Paper 2017-01-0321, 2017, https://doi.org/10.4271/2017-01-0321.Also In
References
- International Journal of Machine Tools and Manufacture 45 3 March 2005 327 334 ELSEVIER
- Wear 260 9-10 31 May 2006 1061 1069 ELSEVIER
- Manufacturing Enginer´s Reference Book Koshal D 1993 IMeche E