Liang Deng
Liang Deng

Liang Deng

Solid Mechanics
Mechanics of Solid Materials
Department of Engineering Sciences and Mathematics
liang.deng@ltu.se
E862 Luleå

TOOLWEAR - Modeling of thermo-mechanical processes for enhanced productivity and quality

Thermo-mechanical forming processes are being increasingly employed in the manufacturing of complex shaped ultra high strength steel (UHSS) for structural and safety components in automobiles. These processes are complex owing to changes in temperatures due to the cooling of the tools, phase transformations and tool-workpiece tribological interactions at elevated temperatures. There is a need for deeper understanding and to create new knowledge in order to be able to predict the tool wear in the press-hardening process.

Previous research at Luleå University of Technology has enabled simulations of the complete thermo-mechanical press hardening process. Some of the tasks to be carried out in the project include:

1. Tribological studies on tool-workpiece pairs at elevated temperatures.

2. Development of predictive models for high precision simulations of tool wear.

3. Validation of the tool wear model.

Nowadays, Al-Si coated workpieces are prevent used in the press hardening processes, which result in severe extrusions in the stamping. This adhesive wear inevitably occurs in tools and decreases the manufacturing capacity. A specific tribological test has been developed to reproduce the contact conditions of the press hardening in laboratory. The measurable adhesion results are obtained to develop a predictive model for tool wear simulation with high accuracy. A full-scale press hardening test performing in industrial environments is used to validate the tool-wear simulation.

The project consortium consists of Gestamp HardTech, Volvo Cars, SSAB EMEA, Oerlikon Balzers, Ionbond and Swerea/Mefosas the industrial partners. Luleå University of Technology (Divisions of Solid Mechanics and Machine Elements) is the academic partner.

Publications

Article in journal

Experimental Evaluation of Galling Under Press Hardening Conditions (2018)

Deng. L, Pelcastre. L, Hardell. J, Prakash. B, Oldenburg. M
Tribology letters, ISSN: 1023-8883, Vol. 66, nr. 3
Article in journal

Tribological Behavior of Tool Steel under Press Hardening Conditions Using Simulative Tests (2018)

Mozgovoy. S, Hardell. J, Deng. L, Oldenburg. M, Prakash. B
Journal of tribology, ISSN: 0742-4787, Vol. 140, nr. 1
Conference paper

A Tribological Test under Press Hardening Conditions for Galling Research (2017)

Paper presented at : 6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2, Atlanta, Georgia, 4-7 June 2017
Article in journal

Development of a Tribological Test Programme Based on Press Hardening Simulations (2017)

Deng. L, Mozgovoy. S, Hardell. J, Prakash. B, Oldenburg. M
Tribology letters, ISSN: 1023-8883, Vol. 65, nr. 2