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  Archive of Mechanical Engineering (1)
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Influence of plunger motion profile of high pressure die casting on the casting porosity and solidification rate

Katarzyna Żak Rafał Dańko Paweł L. Żak Wojcich Kowalczyk

Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 5 | DOI: 10.24425/bpasts.2023.147339

Słowa kluczowe high-pressure die casting computer simulation cooling rate numerical methods aluminium alloy

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Abstrakt

The high pressure die casting (HPDC) is a technique that allows us to produce parts for various sectors of industry. It has a great application in such sectors as automotive, energy, medicine, as the HPDC allows us to produce parts very fast and very cheaply. The HPDC casting quality depends on many parameters. The parameters among others, are cast alloy alloy metallurgy, filling system design, casting technology elements geometry and orientation, as well as, machine operation settings. In the article, different plunger motion schemes of the HPDC machine were taken into account. Analyses lead to learning about plunger motion influence on the casting porosity and solidification process run. Numerical experiments were run with the use of MAGMASoft® simulation software. Experiments were performed for industrial casting of water pump for automotive. Main parameter taken into account was maximal velocity of the plunger in the second phase. The analysis covered porosity distribution, feeding time through the gate, temperature field during whole process, solidification time. Cooling curves of the casting in chosen points were also analysed. Obtained results allow us to formulate conclusions that connect plunger motion scheme, gate solidification time and the casting wall thickness on the solidification rate and porosity of the casting.

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Autorzy i Afiliacje

Katarzyna Żak

e-mail:

ORCID:

Rafał Dańko

e-mail:

ORCID:

Paweł L. Żak

e-mail:

ORCID:

Wojcich Kowalczyk

AGH University of Krakow, Faculty of Foundry Engineering, al. Mickiewicza 30, 30-059 Kraków, Poland
Frech Poland Sp. z o.o., Przedmos´c, Główna 8, 46-320 Praszka, Poland

Three faces of balancing: the development of automatic balancing devices for shafts in motion

Michał Krygier Paweł Żak Leszek Podsędkowski Piotr Wróblewski Maciej Podsędkowski

Archive of Mechanical Engineering | 2023 | vol. 70 | No 3 | 351-366 | DOI: 10.24425/ame.2023.146848

Słowa kluczowe large shafts balancing device automatic balancing development

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Abstrakt

In this paper, the authors present a novel construction of an automatic balancing device applicable to balancing shafts working in a heavily polluted environment. The novelty of the presented system lies in the fact that its utilization requires no changes to be made in the already existing shafts. Also, the system is capable of working during the operation of the balanced shaft, so there is no need to stop it. The propulsion system is based on eddy current braking, therefore no wires need to be used in the device. During the development process of the system, three iterations of the device were created. Each iteration is presented, described, and discussed. The advantages and drawbacks of each version are pointed out and explained thoroughly. The correctness of the design was verified by the created devices that were assembled and fixed on shafts to prove the design assumptions.

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Bibliografia

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[19] H. Kuwajima, H. Kita, H. Hashi, M. Miyamoto, Y. Ueno, T. Inagaki, and K. Matsuoka. Development of balanced-type high shock suspension for 0.85-in hard disk drive. IEEE Transactions on Magnetics, 42(2):255–260, 2006. doi: 10.1109/TMAG.2005.861736.
[20] Gao Jinji and Zhang Peng. Simulative study of automatic balancing of grinding wheel using a continuously-dripping liquid-injection balancing head. In: 2006 6th World Congress on Intelligent Control and Automation, pages 8002-8005, Dalian, China, 2006. doi: 10.1109/WCICA.2006.1713530.
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[22] M. Krygier, P. Żak, L. Podsędkowski, P. Wróblewski, and M. Podsędkowski. A novel autonomous balancing system for shafts in motion. 2022 20th International Conference on Mechatronics – Mechatronika (ME), pages 1-4, Pilsen, Czech Republic, 2022, doi: 10.1109/ME54704.2022.9983460.
[23] M. Krygier, P. Żak, and L. Podsedkowski. Numerical analysis of torques generated in a propulsion system using eddy currents phenomenon. 5th International Conference on Robotics Systems and Automation Engineering (RSAE) (RSAE 2023), April 20–22, 2023, online.

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Autorzy i Afiliacje

Michał Krygier

e-mail:

ORCID:

Paweł Żak

e-mail:

ORCID:

Leszek Podsędkowski

e-mail:

ORCID:

Piotr Wróblewski

e-mail:

ORCID:

Maciej Podsędkowski

e-mail:

ORCID:

Institute of Machine Tools and Production Engineering, Lodz University of Technology, Lodz, Poland
Institute of Turbomachinery, Lodz University of Technology, Lodz, Poland