engleski

Investigation of rope connections on diamond wire saw

The efficiency of diamond wire saw upon exploitation of natural stone depends on the right choice of the constructional and technological factors of the machine, diamond wire and conditions and way of exploitation in the particular kind of the rock. One of these parameters is the steel rope of diamond wire. In the company Jadrankamen –Pučišća (the island of Brač) the consumption of different rope types was observed in order to determine the characteristics of diamond wire rope and changes of these characteristics after the operation within a certain period of time. The observed ropes were tested in the laboratory after samples were taken from the new ropes and the same ropes after particular ones had to be replaced due to deterioration. After a detailed visual examinations the testings of breaking strength, bending and twisting of the rope were also conducted. The results of these testings were presented at the 10th International Conference: Investigation, Production and Use of Steel Wire Ropes - Slowakia, 1998. (Dunda, 1998). The testings of the deteriorated ropes have pointed to the causes of decrease of tensile, torsion and bending strengths. The main cause of wire deterioration appeared to be corrosion, rubbing and crushing of the rope. These are also the places of the reduced wire resistance. It was determined that the wire joints are especially sensitive elements of diamond wire.The sudden changes of tensile strengths and the sudden repeated axial impacts, which appear upon the start-up of the saw after the break, have the highest effect on the links of the particular rope sections. These are therefore critical areas especially when the sawing angles are more acute. In order to find out if there is and how much is the difference between breaking load of the rope and breaking load of the joint on the rope we conducted additional laboratory testings, the results of which are presented in this paper.

Dimension stone; Diamond wire saw; Steel ropes

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