St Ve Katraklarla Kesimi Problemli Olan Doğal Taşların Tektelli Blok Kesme Sistemiyle Kesiminin İncelenmesi
Abstract
Monowire block cutting machines are used to squaring natural stone masses and to produce
plates from these blocks. The aim is to produce the most economical and highest quality
production in the quarries and factories where the production is carried out. One of the most
important parameters affecting the cutting costs in block production is the energy consumed
during cutting, and the other one is the wear on the diamond beads by which the cut is made.
Wearing on diamond bead is occuring severely during the cutting process which reduces
cutting efficiency and shortens the wire's life. A very good understanding of the cutting
system is required so that the operation economy is not greatly affected by this situation.
This study aims to investigate the cutability of natural stones used by monowire cutting
method which has various problems in slab production using ST and Gang Saw type
machines. In this thesis, samples were taken from a natural stone (limestone) field in Sivas
where the slab production is done by using diamond wire cutting machines. The reason why
choosing of this kind of limestone is that when the stone is cut by using ST and Gang Saw
type machines, the block efficiency is very low and the slab cutting can not be done without
block improvement implications. Within the scope of the thesis, computer controlled fully
automatic monowire cutting machine which is developed at Hacettepe University Mining Engineering Department was used. In the experiments, three different diameters of diamond
beads were used. Bead diameters are 7,3 mm, 8,5 mm and 11 mm, respectively. The
experiments were carried out at three different peripheral speeds (28, 30 and 33 m/sec), three
different cutting speeds (12, 16 and 20 mm/min) and different cutting thicknesses (2, 3, 4, 5,
6 cm). All the data determined at the end of the study were brought together and the results
were interpreted by associating with bead wear and energy consumed in the cutting
processes.
As a result of the study, no fracture was detected on the plates and it was determined that the
plate thickness of 2 cm could be easily reached. Optimum cutting conditions were
determined for Sivas Beji limestone sample. When optimum cutting conditions are
determined, it is aimed to provide the maximum cutting speed which is in harmony with
minimum unit energy, unit wear and peripheral speed. Optimum cutting performance was
obtained in wire cuts with a peripheral speed of 30 m / sec, a cutting speed of 20 mm / min
and a bead diameter of 8,5 mm, and cuts of different thicknesses were observed to have no
effect on the yield of the plates.