Lost Core Technology. A challenging growth opportunity. Hermann Jacob Roos
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1 Lost Core Technology A challenging growth opportunity. Hermann Jacob Roos 1 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
2 Trends and market needs. Challenging future requirements Downsizing of vehicles and engines Improved powertrains Weight reduction Source: International Council on Clean Transportation 2 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
3 Technical Opportunities of Lost Core Technology. DESIGN Complex internal ducts. Undercuts are feasible. Surface quality. Combining different salt cores. TECHNICAL Strengthening of designs. Cooling concepts. Internal fluid connections. Optimized fluid flow. ECONOMIC Avoid shell constructions. Near net shape production. High productivity of HPDC. 4 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
4 Process Chain. 1.) Part Design for salt core Application 2.) Die concept, aluminum part and salt core 4.) Salt core production on HPDC casting machine 3.) Filling and solidification simulation salt core and aluminum 5.) Aluminum part production with salt cores inlays 6.) Salt Core removing unit 7.) Worldwide support & know-how 5 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
5 Salt core - shrinkage behavior. Very rapid solidification of the surface layer. The surface is an insulator. Long solidification time of the central zone. Shrinkage factor depends on part geometry. Investigation of salt structure; Symposium sample. 6 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
6 Possibilities - Simulation with materials salt and aluminum. Salt Core Production Design of gating and venting system (salt die). Pre-check of shot profile Check of solidification. Aluminum Casting Design of gating and venting system. Check of flow circulation around salt core. FSI Simulation Fluid-Structure-Interaction: Calculation of forces affecting the salt core during filling process. 8 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
7 Salt Core Simulation. Results of filling simulation. Prediction of potential air porosity. Air porosity and shrinkage porosity detected in CT-analysis. Simulation result shows potential areas for air porosity. 9 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
8 Process chain and necessary machines for Lost Core production. Mixing Melting&Dosing Salt Core Casting Aluminum Casting Core Removing Ladler or Rauch furnace 10 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
9 Process steps. Salt core casting out of liquid phase - Movie 11 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
10 Aluminum casting with salt core inlay. Core print in aluminium die. - firm or loss? Flow direction. - direct or indirect? Gate velocity. - low or high speed? Symposium sample including gating 12 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
11 Removing of salt core. Removing with high-pressure water: Physical effects: 1. Kinetic energy generated by water-jet (+ + +) 2. Salt dissolving (+) Known and reliable technology. Worldwide availability. Jet nozzle 13 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
12 Examples - New design ideas for HPDC parts. 14 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
13 Summary. Costs are reduced by minimizing assembling, machining and sealing systems. High automation rate of HPDC. Expanding the geometric freedom of HPDC parts. Creating completely new parts for the future. Wherever you are Bühler can support you with Technology and Process Know-How! 15 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
14 Thank you for your attention. 16 Bühler 13. internationaler Deutscher Druckgusstag Hermann Roos 2013
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