Oblique Gate Direction During Centrifugal Casting in Artificial Lumbar Disc Model of CP-Ti

Self Cite

Bimetallic is a type of metal composite that combines two metals that form a metallurgical bond. The manufacture of bimetallic bushings by centrifugal casting has not been developed much. Recently, there is no recommendation yet for optimum temperature and speed of rotation to produce bimetallic bushings. The research was conducted to determine the rotation of the mold in centrifugal casting so as to produce a well-integrated interface. The materials used are aluminum and copper. Aluminum was melted at 750 °C, while copper was melted at 1200 °C. Molten metal was pouring alternately. First, aluminum was poured into the mold, and then after the aluminum temperature reached 400º C, copper was poured into the mold to form a bushing aluminum-copper bimetallic. The molten metal was poured into a rotating sand mold with a constant filling speed of about 0.15 kg s-1. The variations of the rotational speed of the mold were 250, 300, and 350 rpm. The result shows that the interface’s width increases as the mold rotation increases during the pouring process. Interface hardness and wear are increased compared to the base metal. Hence, centrifugal casting with 350 rpm is recommended for aluminum-copper bimetal bushing applications.

Section: Discussionmentioning

confidence: 99%

Characteristic of Interface Bimetal Aluminum-Copper for Bimetal Bushing Produced by Centrifugal Casting

Santoso

Suharnadi

Prayoga

et al. 2021

Self Cite

“…The bimetallic interface widths made with the temperature of 27ºC, 350ºC, 400ºC, and 450ºC are 10 µm, 54 µm, 83 µm, and 96 µm, respectively. The increase of molten metal pressure happens due to the tangential and centrifugal force represents on molten metal when entering the mold [3,23]. The driving force of the molten metal increases due to the high rotation during the pouring process.…”

Section: Discussionmentioning

confidence: 99%

“…The appropriate temperature of the first frozen layer causes the formation of bonds at the aluminum alloy-bronze metal interface. In addition, the centrifugal force generated by the rotation of the mold pushes the molten metal as it enters the mold [3,23]. Both of these parameters increase the bond strength and diffusion at the interface.…”

Section: Discussionmentioning

confidence: 99%

Bonding of Interface Bimetal Aluminum-Bronze for Bimetal Bushing Produced by Solid Liquid Method

Setyana

Santoso

Suharnadi

et al. 2022

Bimetal is a combination of two dissimilar metals that form a metallurgical bond. The manufacture of bimetallic bushing by centrifugal casting has not been widely developed. There is still no recommendation for optimum temperature used in the manufacture. The aim of this research was to determine the first frozen layer temperature of the aluminum when bronze was poured to produce a well-integrated bond interface. The materials used were aluminum and bronze. Molten metal was pouring into the mold alternately. First, aluminum was poured into the mold. Then, bronze was poured gradually to form a bushing aluminum-bronze bimetallic. The temperature variations of the first frozen layer of aluminum were 27º C, 350º C, 400º C, and 450º C when bronze poured. The molten metal was poured with the filling speed of about 0.2 kg/s into a rotating sand mold. The rotational speed of the mold was 350 rpm. The result shows that the bond interface’s width increases as the first frozen layer aluminum temperature increases. As a result, interface wear and hardness are increased compared to the base metal. Hence, centrifugal casting with the first frozen layer aluminum was 450ºC recommended for aluminum-bronze bimetal bushing applications.

“…This casting process is widely used because it is relatively simple and can be used to make components with complex shapes, for example, objects that have internal channels and cavities [1,2]. The casting process is not only used for cast iron, but also for non-ferrous materials [3][4][5][6][7]. Gray cast iron has flake -shaped graphite, while ductile cast iron has nodular graphite [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Hardness in Gray Cast Iron Casting Process

Yulianto

Soenoko²,

Suprapto³

et al. 2021

This study aims to investigate the thermal conditions of the molds, changes in microstructure and hardness of casting products using sand mold and permanent mold. The use of sand mold and permanent mold results in different cooling rates. Thermal analysis was performed using a thermocouple to obtain a temperature versus time curve. Metallographic observations were carried out using a Scanning Electron Microscope equipped with Energy-Dispersive X-ray Spectroscopy. The Vickers hardness test was carried out in three areas with different thicknesses. The results showed a constant temperature at 691 oC where the eutectoid phase reaction occurred. Testing with sand mold showed that cast iron with flake graphite was finer and spreader than graphite in cast iron produced by permanent mold. Meanwhile, gray cast iron from a casting process with a permanent mold has a higher hardness than gray cast iron from a casting process using a sand mold.