TY - JOUR

T1 - Temperature measurement with thin film sensors during warm forging of steel

AU - Plogmeyer, M.

AU - Kruse, J.

AU - Stonis, M.

AU - Paetsch, N.

AU - Behrens, B. A.

AU - Bräuer, G.

N1 - Funding Information: Open Access funding enabled and organized by Projekt DEAL. This scientific work has been funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project Numbers BR 2178/42–1 and BE 1691/220–1.

PY - 2021/10

Y1 - 2021/10

N2 - Warm forged components have better surface properties and higher dimensional accuracy than hot forged components. Diamond-like-carbon (DLC) coatings can be used as wear protection coatings, which are anti-adhesive and extremely hard (up to 3500 HV), to increase tool service life. In the first funding period of the research project at the IPH – Institut für Integrierte Produktion Hannover gGmbH and the Institute for Surface Technology (IOT) of the Technical University of Braunschweig in cooperation with the Fraunhofer Institute for Surface Engineering and Thin Films (IST), the influence of different coating types and process temperatures on tool wear was investigated. The result is, that DLC coatings can reduce tool wear in some cases significantly, but that their service life is strongly dependent on the temperature. Coating-integrated temperature measurement could not be realised at that point, due to adhesion challenges. During the second funding period, the effect of multilayer DLC coatings on tool wear was investigated. Also, an additional method of the temperature measurement on the engraving surface using thin film sensors was developed in order to correlate the local process temperature and local layer wear. In this work, the development of and the results gathered by the thin film temperature sensors are presented, which enable for more accurate temperature measurements than commonly used thermocouples. Their functionality and durability under high loads were investigated and showed to be promising.

AB - Warm forged components have better surface properties and higher dimensional accuracy than hot forged components. Diamond-like-carbon (DLC) coatings can be used as wear protection coatings, which are anti-adhesive and extremely hard (up to 3500 HV), to increase tool service life. In the first funding period of the research project at the IPH – Institut für Integrierte Produktion Hannover gGmbH and the Institute for Surface Technology (IOT) of the Technical University of Braunschweig in cooperation with the Fraunhofer Institute for Surface Engineering and Thin Films (IST), the influence of different coating types and process temperatures on tool wear was investigated. The result is, that DLC coatings can reduce tool wear in some cases significantly, but that their service life is strongly dependent on the temperature. Coating-integrated temperature measurement could not be realised at that point, due to adhesion challenges. During the second funding period, the effect of multilayer DLC coatings on tool wear was investigated. Also, an additional method of the temperature measurement on the engraving surface using thin film sensors was developed in order to correlate the local process temperature and local layer wear. In this work, the development of and the results gathered by the thin film temperature sensors are presented, which enable for more accurate temperature measurements than commonly used thermocouples. Their functionality and durability under high loads were investigated and showed to be promising.

UR - http://www.scopus.com/inward/record.url?scp=85099833031&partnerID=8YFLogxK

U2 - 10.1007/s00542-020-05179-9

DO - 10.1007/s00542-020-05179-9

M3 - Article

AN - SCOPUS:85099833031

VL - 27

SP - 3841

EP - 3850

JO - Microsystem Technologies

JF - Microsystem Technologies

SN - 0946-7076

IS - 10

ER -