REKAYASA DAN RANCANG BANGUN HEAVY DUTY COUPLING PRODUK IKM SEBAGAI SUBTITUSI IMPORT

Pander Sitindaon, Haposan Situngkir, Jimmy G. Simanjuntak

Abstract


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.

Keywords


coupling; casting; cast iron; riser;

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