Ejection Performance of Coated Core Pins Intended for Application on High Pressure Die Casting Tools for Aluminium Alloys Processing

Terek, Pal; Kovačević, Lazar; Miletić, Aleksandar; Kukuruzović, Dragan; Škorić, Branko; Drnovšek, Aljaž; Panjan, Peter

doi:10.24874/ti.2017.39.03.08

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…[8][9][10]. These layers are usually deposited by physical vapor deposition (PVD) techniques [11][12][13]. Coatings commonly deposited used for protection of HPDC dies are thin, hard ceramic coatings based on transitional-metal nitrides and oxides and a combination of these.…”

Section: Introductionmentioning

confidence: 99%

“…Examination of their surfaces provides additional information about the soldering process. Based on the relative movement performed between the sample and the casting during the separation, these tests can be divided into the ejection test [11,17] and the detachment test [20,21]. The ejection test is used for the evaluation of cylindrical pin samples overlapped by the casting, while the detachment is developed for evaluation of flat sample surfaces.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of CrAlN Coating Chemical Composition on Soldering Resistance in Contact with Al-Si-Cu Alloy

Kukuruzović¹,

Terek²,

Kovačević³

et al. 2020

2nd Coatings and Interfaces Web Conference (CIWC-2 2020)

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During the high pressure die casting (HPDC) process the die material is exposed to thermal fatigue, erosion, and corrosion. Corrosion leads to the soldering of cast alloy to tool surfaces which consequently bonds the casting with die material. Besides wear, such a process reduces the casting quality and production efficiency and endangers the tool integrity. Application of thin ceramic coatings on die surfaces reduces the soldering effects and improves the die performance. However, the development of ceramic coatings for these purposes still requires detailed information on the phenomena involved in these processes. In this study, the soldering performance of a complex nanolayer CrAlN coating, with three chemical compositions (high-Cr, balanced Cr:Al, and high-Al content) were evaluated. The cast alloy soldering was evaluated by the detachment test in three configurations. In this test, a simple casting is formed in contact with flat coated surfaces. Upon casting solidification, the formed joint is dismantled, and a force required for this process was recorded. To characterize and quantify the exhibited wear, after the detachment test, surfaces of the coated samples were analyzed by different microscopy techniques. Two forms of wear were detected on investigated samples. Cast alloy soldering processes induced the formation of thin layers of cast alloy on the surfaces of all investigated coatings. Additionally, substrate corrosion through the coating growth defects caused coating layer delamination during the detachment test. The evaluated coatings displayed different behaviors regarding the extent of wear and values of the detachment force. The coating with a balanced CrAlN composition exhibited the best soldering and corrosion resistance and displayed the lowest ejection force. In terms of soldering and corrosion resistance, the high-Al coating outperformed the high-Cr content coating. However, high-Al and high-Cr coating exhibited significantly higher and quite comparable values of detachment force. Based on the quantitative results it was postulated that, besides soldering and substrate corrosion, the casting-coating bonding strength depends also on “pure” sticking effects of cast alloy to coated surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of CrAlN Coating Chemical Composition on Soldering Resistance in Contact with Al-Si-Cu Alloy

Kukuruzović¹,

Terek²,

Kovačević³

et al. 2020

2nd Coatings and Interfaces Web Conference (CIWC-2 2020)

View full text Add to dashboard Cite

show abstract

“…Some investigations, such as those of Adam [2] and Terek et al [3], dealt with the experimental determination of demoulding forces in relation to surface coatings. While for Adam [2] the aim of the investigations was to avoid spraying and thus the associated damage to the die, for Terek et al [3] the aim was to generally reduce the demoulding forces by surface coating of the die. Both used a simplified aluminium die casting component and measured the tensile force necessary to pull coated pins from the cooled part.…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Krischke,

Müller,

Schuchardt

et al. 2018

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A measuring system was developed for the measurement of ejector forces in the die casting process. When selecting the sensor technology, particular care was taken to ensure that measurements can be taken with a high sampling rate so that the fast-running ejection process can be recorded. For this reason, the system uses piezoelectric force sensors which measure the forces directly at the individual ejector pins. In this way, depending on the number of sensors, it is possible to determine both the individual ejector forces and the total ejector force. The system is expandable and adaptable with regard to the number and position of the sensors and can also be applied to real HPDC components. Automatic triggering of the measurements is also possible. In addition to the measuring system, a device and a method for in-situ calibration of the sensors have also been developed. To test the measuring system, casting experiments were carried out with a real aluminium HPDC aluminium component. The experiments showed that it is possible to measure the ejector forces with sufficient sampling rate and also to observe the process steps of filling, intensification and die opening by means of ejector forces. Experimental setup serves as a basis for future investigations regarding the influencing parameters on the ejection process.

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Towards lube-free aluminum high pressure die casting using duplex AlCrN physical vapor deposition coatings

Campos Neto,

Brune,

Luo

et al. 2023

Journal of Materials Research and Technology

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Ejection Performance of Coated Core Pins Intended for Application on High Pressure Die Casting Tools for Aluminium Alloys Processing

Abstract: A B S T R A C T

Cited by 4 publications

References 6 publications

The Influence of CrAlN Coating Chemical Composition on Soldering Resistance in Contact with Al-Si-Cu Alloy

The Influence of CrAlN Coating Chemical Composition on Soldering Resistance in Contact with Al-Si-Cu Alloy

Archives of Foundry Engineering

Towards lube-free aluminum high pressure die casting using duplex AlCrN physical vapor deposition coatings

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