Hardness Loss of Plastic Mold Steels: Phenomenon in Injection Molding
Research output: Contribution to journal › Article › Research › peer-review
Standard
In: Steel research international, Vol. 2022, No. 11, 2200326, 28.09.2022.
Research output: Contribution to journal › Article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex - Download
}
RIS (suitable for import to EndNote) - Download
TY - JOUR
T1 - Hardness Loss of Plastic Mold Steels
T2 - Phenomenon in Injection Molding
AU - Zidar, David
AU - Landefeld, Andreas
AU - Gschöpf, Boris
AU - Schnitzer, Ronald
AU - Zunko, Horst
AU - Friesenbichler, Walter
N1 - Publisher Copyright: © 2022 The Authors. Steel Research International published by Wiley-VCH GmbH.
PY - 2022/9/28
Y1 - 2022/9/28
N2 - The standard application-oriented test for abrasive wear of polymers on plastic mold steels is the platelet wear tester method in which two steel specimens form a thin wear slit. The glass fiber-reinforced polymer melt is injected through the wear slit, and the surface of both specimens is abraded. In the injection molding process, similar conditions often occur in thin-walled parts or film gates. Drastic loss of the hardness of a powder metallurgical steel (PM steel) is discovered after approx. 200 injection cycles while performing platelet wear tests. For experimentally analyzing the reason for the loss of steel hardness during injection molding, a new platelet wear testing apparatus is developed, which can be used to measure the increase in temperature inside the steel specimen while testing. The first results show and support the hypothesis that a temperature increase above the annealing temperature occurs inside the steel due to viscous dissipation at the steel surface. In cooperation with the company voestalpine BÖHLER Edelstahl & Co KG, tests on the PM steel in a dilatometer are performed to simulate the cycle-by-cycle heat pulses occurring in the injection molding process. With the results of those tests, it is possible to state a hypothesis for the reason of this hardness loss.
AB - The standard application-oriented test for abrasive wear of polymers on plastic mold steels is the platelet wear tester method in which two steel specimens form a thin wear slit. The glass fiber-reinforced polymer melt is injected through the wear slit, and the surface of both specimens is abraded. In the injection molding process, similar conditions often occur in thin-walled parts or film gates. Drastic loss of the hardness of a powder metallurgical steel (PM steel) is discovered after approx. 200 injection cycles while performing platelet wear tests. For experimentally analyzing the reason for the loss of steel hardness during injection molding, a new platelet wear testing apparatus is developed, which can be used to measure the increase in temperature inside the steel specimen while testing. The first results show and support the hypothesis that a temperature increase above the annealing temperature occurs inside the steel due to viscous dissipation at the steel surface. In cooperation with the company voestalpine BÖHLER Edelstahl & Co KG, tests on the PM steel in a dilatometer are performed to simulate the cycle-by-cycle heat pulses occurring in the injection molding process. With the results of those tests, it is possible to state a hypothesis for the reason of this hardness loss.
KW - Plastic mold steel
KW - loss of hardness
KW - injection molding
UR - http://www.scopus.com/inward/record.url?scp=85141165341&partnerID=8YFLogxK
U2 - 10.1002/srin.202200326
DO - 10.1002/srin.202200326
M3 - Article
VL - 2022
JO - Steel research international
JF - Steel research international
SN - 0177-4832
IS - 11
M1 - 2200326
ER -
