Pander Sitindaon, Haposan Situngkir, Jimmy G. Simanjuntak


Coupling is an engineering equipment used to transfer power and rotation of the driving motor to the actuated equipment. Coupling consists of  two parts, one part is mounted on the driving motor and the other is mounted on the actuated equipment. Power and rotation can be moved by using bolts wrapped with rubber. The coupling castings are made of gray cast iron fabricated by casting techniques, cast iron is melted on a cupola furnace and poured on a sand mold. One piece of as-cast coupling casting weighs about 100 kg with a diameter of 400 mm and a thickness of 200 mm. After casting is produced, machining is done to obtain the dimensions as planned. Almost all heavy-duty coupling castings produced by SMI have poor quality, in the castings there are holes due to shrinkage cavities that are sometimes seen after machining. Total high reject castings sometimes reach up to 80 percent. To overcome this shrinkage cavity, coupling is casted on an open mold and adds to the thickness of the castings. This method does not help much because it will increase the excessive weight of castings and complicate the machining, there is often a curvature in themiddle so that when machining the thick size of the cast does not meet.


coupling; casting; cast iron; riser;

Full Text:

PDF (Indonesian)


George E. Dieter (19810, Mechanical Metallurgy. Tokyo: Kosaido Printing Co.

Harmonic Krisnawan dkk (2012)

Pengaruh Ukuran Riser Terhadap Cacat Penyusutan dan cacat porositas produk cor

Aluminium cetakan pasir, Mekanika Vol. 10.

Heine Richad W., Carl R. Loper Jr., Rosenthal Philip C. Principles of Metal Casting. New York: Mc Graw-Hill Book Company, 1967.

Hattori.K. Practice of Risering in Steel Casting Foundry Engineering Nagoya International

Training Centre Japan International Cooperation Agency (JICA)

Kalpakjian, Scmid (2003) Manufacturing Processes for Engineering Material. Prantice Hall.

Obata.R. Fundamental of Risering Foundry Engineering Nagoya International Training

Centre Japan International Cooperation Agency (JICA)

Tata Surdia, Kenji Chijiiwa (1975), Teknik Pengecoran Logam. Jakarta: Pradnya Paramita.

Tjitro Soejono (2001), Pengaruh Bentuk Riser Terhadap Cacat Penyusutan Produk Cor Aluminium Cetakan Pasir, Jurnal Teknik Mesin, Vol. 3,.

Tjitro Soejono (2002), Pengaruh Modulus Cor Riser Terhadap Cacat Penyusutan Pada Produk Paduan Al-Si, Jurnal Teknik Mesin vol. 4, no. 2.

Tjitro Soejono (2003), Analisa Pengaruh Bentuk Penampang Riser Terhadap Cacat Porositas, Jurnal Teknik Mesin Vol. 5 No. 2.

Sugeng Slamet dan Taufiq Hidayat (2014), Penerapan Model Saluran Dan Cawan Tuang untuk Mengatasi Cacat Porositas Produk Cor di IKM Budi Jaya Logam Juwana Kabupaten Pati, Prosiding SNST ke 5.

Winte.C.H (1946), Gray Iron Casting Section Sensitivity, Trans. AFS, Vol. 54,

Widodo. R (1998) Analisa Cacat Coran, Politeknik Manufaktur Bandung.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.