Main and pin journals
Producing main and pin journals are high volume operations with high expectations on low costs per part. Both features require dedicated machine equipment to achieve reliable performance and high quality.
An internal rough milling concept provides a stable, exchangeable segment system with high process security and excellent tool life, giving a low cost per part.
However, for large volumes of small to medium-sized automotive crankshafts, an external concept is both flexible and productive, as you can use high cutting speeds and still achieve good chip evacuation and low cutting forces.
Turn-turn broaching for semi-finishing and finishing
For semi-finishing and finishing of the main journals, post ends and flanges, use an engineered turn-turn-broaching tool with indexable inserts for the best result.
Turn-turn broaching is a smart combination of turning and turn broaching that provides productive, cost effective and flexible machining with short cycle times, high flexibility and fast tool-setting. The turning and turn broaching cassettes are mounted radially on a disk turret that moves into the crankshaft and along the bearings as the crankshaft rotates. Use Sandvik Coromant inserts for disc tools of up to 48 cassettes.