Cross-Wedge Rolling Process Optimization

Cross-wedge rolling (CWR) is a versatile forging technique that transforms cylindrical billets into complex axisymmetric components through the action of converging wedge-shaped tools. Process optimisation has focused on refining wedge geometry, adjusting roll speeds, controlling temperature gradients and implementing real-time monitoring to minimise defects such as central cracking, material folding and surface irregularities. By integrating high-fidelity finite element simulation with advanced calibration tests, engineers can accurately predict areas of high stress and strain, allowing for the selection of optimal process parameters and tool designs. Recent developments in modified damage criteria enable temperature-independent prediction of fracture initiation, while microstructural analysis illuminates the role of inclusions and grain boundary embrittlement. These advances contribute to reduced material waste, improved dimensional precision and enhanced production efficiency. The global significance of CWR optimisation spans sectors including automotive, rail and aerospace, where the demand for lightweight, high-strength components and energy-efficient manufacturing continues to rise. Practical implementations range from near-net-shape forging of shafts and axles to specialised finishing rollers for gear production, underscoring the method’s broad industrial impact.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Research from all publishers

In addressing fracture prediction, a new hybrid damage criterion has been proposed that decouples failure limits from calibration temperature. By combining rotary compression tests with finite element simulations, this criterion delivers temperature-independent fracture thresholds. Validation on railway axle forgings demonstrated accurate crack prediction, offering a practical tool for designing CWR processes with minimal trial-and-error. Complementary work has revealed the critical role of billet microstructure and non-metallic inclusions in central crack formation. Detailed characterisation at ambient and forming temperatures identified inclusion size and distribution along grain boundaries as primary factors driving embrittlement under high plastic strain, leading to recommendations for stringent control of inclusion content in feedstock. Foundational studies have evaluated multiple damage functions, applying novel calibration tests to assess their applicability to CWR. Through comparative experimental and numerical analysis of harrow tooth preforms, these investigations have benchmarked nine damage criteria, highlighting the most reliable models for accurate failure prediction and process parameter optimisation.

Cross-Wedge Rolling Process Optimization publication trend

The graph below shows the total number of articles in cross-wedge rolling process optimization across all publications each year (not limited to Nature Index journals).

Technical terms

Cross-wedge rolling (CWR): A hot forging process that shapes axisymmetric parts by passing a billet through converging wedge tools.

Damage criterion: A numerical model used to predict the onset of ductile fracture based on stress and strain states.

Rotary compression test: An experimental calibration method where a sample is compressed by rotational movement in a tool cavity to induce fracture.

Finite element simulation: A computational technique that divides a workpiece into discrete elements to model deformation and predict outcomes.

Inclusions: Non-metallic particles within a metal billet that can act as stress concentrators and initiate cracks during forging.

References

1. Modified hybrid damage criterion for the cross wedge rolling process. Journal of Manufacturing Processes (2023).
2. Microstructural effects on central crack formation in hot cross-wedge-rolled high-strength steel parts. Journal of Materials Science (2020).
3. Prediction of Crack Formation for Cross Wedge Rolling of Harrow Tooth Preform. Materials (2019).
4. Study on the defect reduction of metal folding on the formed tooth top with finishing roller in gear rolling process. Scientific Reports (2023).
5. Research and industrialization of near-net rolling technology used in shaft parts. Frontiers of Mechanical Engineering (2018).