Details
| Original language | English |
|---|---|
| Title of host publication | 31st International Conference on Metallurgy and Materials, METAL 2022 |
| Pages | 227-232 |
| Number of pages | 6 |
| ISBN (electronic) | 9788088365068 |
| Publication status | Published - 30 Jun 2022 |
| Event | 31st International Conference on Metallurgy and Materials, METAL 2022 - Brno, Czech Republic Duration: 18 May 2022 → 19 May 2022 |
Abstract
Hot forming tools are exposed to cyclically changing thermal loads. These conditions are caused by the heat exchange between tool and workpiece during forming followed by spray cooling. This can lead to crack initiation and tool failure. A continuous cooling with heatpipes (HP) inside the active tool components could prevent this. HP use a circular flow of a cooling fluid inside a closed tube, often made of copper. Previous studies showed an influence of the connection by thermal paste between the forming die and the HP, its orientation, as well as its inner surface structure. The use of paste proved essential for closing the contact by filling the microscopic air pockets between the surfaces. Only sintered inner structures can be used for force fit, since others are damaged by deformation and thus lose their efficiency. This research paper deals with the influence of the form and force fit between die and HP. To test the impact, HP were connected with heated model dies on one side and an aluminium block (AB) on the other. Thermocouples were used to monitor the temperature of both, the AB and the model dies. The measured temperature and time difference, the weight and the thermal capacity of the AB were used to calculate the heat flow. Different inner surface structures of HP were varied in addition to their fitting type with the model die. The best heat transfer was achieved by using HP with sintered inner structure and force-fit, resulting in nearly full-surface contact.
Keywords
- forging tools, heat transfer, Heatpipes, thermal conduction
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Metals and Alloys
- Materials Science(all)
- Surfaces, Coatings and Films
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31st International Conference on Metallurgy and Materials, METAL 2022. 2022. p. 227-232.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Influence of the connection between forming die and heatpipe on the heat transfer
AU - Behrens, Bernd Arno
AU - Brunotte, Kai
AU - Peddinghaus, Julius
AU - Laeger, René
N1 - Funding Information: The results presented were obtained in the project "Targeted die temperature control by integrating heat pipes in hot forging tools" - Project ID 189451423. The authors thank the Deutsche Forschungsgemeinschaft (German Research Foundation, DFG) for their financial support.
PY - 2022/6/30
Y1 - 2022/6/30
N2 - Hot forming tools are exposed to cyclically changing thermal loads. These conditions are caused by the heat exchange between tool and workpiece during forming followed by spray cooling. This can lead to crack initiation and tool failure. A continuous cooling with heatpipes (HP) inside the active tool components could prevent this. HP use a circular flow of a cooling fluid inside a closed tube, often made of copper. Previous studies showed an influence of the connection by thermal paste between the forming die and the HP, its orientation, as well as its inner surface structure. The use of paste proved essential for closing the contact by filling the microscopic air pockets between the surfaces. Only sintered inner structures can be used for force fit, since others are damaged by deformation and thus lose their efficiency. This research paper deals with the influence of the form and force fit between die and HP. To test the impact, HP were connected with heated model dies on one side and an aluminium block (AB) on the other. Thermocouples were used to monitor the temperature of both, the AB and the model dies. The measured temperature and time difference, the weight and the thermal capacity of the AB were used to calculate the heat flow. Different inner surface structures of HP were varied in addition to their fitting type with the model die. The best heat transfer was achieved by using HP with sintered inner structure and force-fit, resulting in nearly full-surface contact.
AB - Hot forming tools are exposed to cyclically changing thermal loads. These conditions are caused by the heat exchange between tool and workpiece during forming followed by spray cooling. This can lead to crack initiation and tool failure. A continuous cooling with heatpipes (HP) inside the active tool components could prevent this. HP use a circular flow of a cooling fluid inside a closed tube, often made of copper. Previous studies showed an influence of the connection by thermal paste between the forming die and the HP, its orientation, as well as its inner surface structure. The use of paste proved essential for closing the contact by filling the microscopic air pockets between the surfaces. Only sintered inner structures can be used for force fit, since others are damaged by deformation and thus lose their efficiency. This research paper deals with the influence of the form and force fit between die and HP. To test the impact, HP were connected with heated model dies on one side and an aluminium block (AB) on the other. Thermocouples were used to monitor the temperature of both, the AB and the model dies. The measured temperature and time difference, the weight and the thermal capacity of the AB were used to calculate the heat flow. Different inner surface structures of HP were varied in addition to their fitting type with the model die. The best heat transfer was achieved by using HP with sintered inner structure and force-fit, resulting in nearly full-surface contact.
KW - forging tools
KW - heat transfer
KW - Heatpipes
KW - thermal conduction
UR - http://www.scopus.com/inward/record.url?scp=85144130745&partnerID=8YFLogxK
U2 - 10.37904/metal.2022.4397
DO - 10.37904/metal.2022.4397
M3 - Conference contribution
AN - SCOPUS:85144130745
SP - 227
EP - 232
BT - 31st International Conference on Metallurgy and Materials, METAL 2022
T2 - 31st International Conference on Metallurgy and Materials, METAL 2022
Y2 - 18 May 2022 through 19 May 2022
ER -