Resource-efficient fine processing of crankshafts

Objective

• Substituting pre-grinding of the bearings with hard-turn milling
• Substituting finish-grinding of the bearings with hard-turn broaching and belt finishing
• Hard-burnishing of the turned axial surface for flange bearings
• Improved resource efficiency due to completely dry process

Approach

• Tool and process development of hard-turn milling, hard-turn broaching and hard-burnishing
• Development of tools and technology associated with belt finishing in order to achieve significant improvements in the straightness and roundness
• Development of a regulation concept to minimize deformations when hard-turn broaching based on determination of the bearing geometry

Development objectives

• Verification of the results on the crankshaft demonstration unit
• Evaluation of the tribological bearing properties in test-bench runs
• Determination of the savings potential

Benefits

• Significant reduction in primary processing times compared to grinding
• Reduction in energy consumption
• Completely dry process