Multi Wire Saw Machine Granite Block Cutter N6870/70

The new NDF 6870/70 multiple diamond wire cutter is a multi-wire machine designed to produce panels and plates of variable thickness from large blocks of granite and natural stone. This new unit represents the most modern technology in terms of the primary sawing of stone blocks, becoming the alternative to all traditionally used sawing methods, since it improves the productive capacity quantitatively, efficiently taking advantage of the necessary energy resources. for the production of materials and significantly reducing the production costs of the cutting phase.
The multiple diamond wire cutter is a machine that stands out for its efficiency and high productivity, designed to obtain high yields, characterized by its great robustness, thanks to its particular design that forms a compact, balanced and compensated unit where all the movements are concentrated, and its proven reliability and that of the elements that compose it, all of it being designed to withstand the harshest working conditions.
The main structure of the machine is basically made up of two robust columns made up of mechano-welded steel structures, connected to each other by an upper crossbar. The structure of the main frame is mounted on both columns, which joins the two handwheel-carrying carriages, which move vertically supported by both columns on linear guides with recirculating linear roller skates and driven by a pair of laminated spindles with recirculating nuts. balls, synchronized and activated by two motor-reducers with independent servomotors for the ascent/descent of the wires with a smooth and precise displacement, located in the upper part of both columns, the entire guide assembly is perfectly protected by PVC bellows .

The Ø1800 driving drum is made up of a single pulley with multiple channels with grooves and connected to the main motor by means of a pulley and toothed belt transmission. The wires are positioned manually depending on the desired thickness, supported on one side of the machine on the drive drum, and in turn are tensioned from the opposite end by autonomous pulleys. The diamond wires are also guided by two multi-channel drums that help to significantly reduce the deflection produced by them. At the end opposite the drive drum, the diamond wires rest on the set of idler pulleys, designed with a particular pivoting extraction system, which significantly reduces maintenance times.
Once the threads are located, they are adjusted with the active tensioning device that acts individually on each one of the tensioning pulleys, independently ensuring that each one of the threads has the same tension regardless of the minimum differences in length that exist between them. each of the threads that are installed in the machine. The tensioning system manages to increase the useful life of the threads and therefore the profitability of the machine.
The entire machine is characterized by the robustness and reliability of the elements that make it up, all of it being designed to withstand the harshest working conditions, and in this aspect it is precisely where we can contribute all the experience accumulated over the years that we have been designing and manufacturing machinery for this sector.
The NDF 6870 multi-wire cutter stands out for the following characteristics:
• Reduced and optimized energy consumption.
• Mechanical robustness and absence of vibrations.
• Active and independent tensioning system, which manages to increase the useful life of the threads, increasing profitability and guaranteeing optimum surface finishes.
• Innovative pulley design, with pivoting extraction system that reduces maintenance times.
• Complete range of cutting thicknesses, thanks to its particular design of pulley packs and combination of grooves, without penalizing the useful life of the diamond wire.
• Excellent cutting accuracy and flatness, thanks to its particular linear slide guide system and its rigid bearing structure.
• Easy and comfortable access to the inside of the machine, thus facilitating the tasks of changing threads and their maintenance.
• Large diameter helical ball screws in the vertical movement for smooth and precise movement.
• Servomotors synchronized by software in the vertical movements that ensure smoothness in the cut, low consumption, maximum precision and avoid clearances and problems of the central motorization with transmission and forwarding.
• Up to 70 or 72 threads with several possibilities for the combination of cutting thicknesses.
• Pre-installation for thread change from Ø7.3 to Ø6.3.
– STRONG POINTS:
The multiple diamond wire cutter is a multi-wire cutter designed to produce slabs and boards of variable thickness from large blocks of granite and natural stone. Traditionally in granite transformation factories, the sawing of blocks is being carried out to the same size with looms when the blocks are large, or with large diamond disc block cutters in stonework workshops when semi-blocks are cut.
The greatest aspect to highlight is that the multi-wire cutter, for an equivalent capacity, the effective energy consumption is lower compared to any of the methods used. This translates into significant energy savings both in implementation and in production costs. This difference in equivalent energy savings is mainly due to the difference in sawing technology, the multi-wire saw only uses up to 70 or 72 loops of diamond wire and water during this process, cutting continuously. These diamond wires are basically made up of a steel cable covered by diamond rings along the cable, The cutting effect on the stone block to obtain the slabs and boards is produced by the effect of the continuous dragging movement of the threads at a linear speed of about 30 m/sec. combined at the same time with the rotation of the rings, producing a very high cutting power, a differentiated effect with respect to large traditional looms where the cutting process can be defined as the effect of a jigsaw, made up of a frame that houses about 100-130 strips of steel in contact with the stone blocks at the same time moving c in combination with the rain of abrasive mixture of water, steel shot and lime, which produces the same number of incisions in the stone block as quantity of strapping
The multiple diamond wire cutter is the alternative to the primary sawing methods currently used, improving the productive capacity quantitatively, efficiently taking advantage of the energy resources necessary for the production of materials and significantly reducing the waste produced during the cutting phase.
Comparatively, the advantages of using this new technology applied to the multi-wire cutter are evident. The multi-wire cutter can cut any type of stone material compared to the looms that only cut granite or marble, but they are two different models and use different tools, the looms are only profitable when they cut sheets of 2-3 centimeters in length. thickness, but its greatest disadvantage is in energy consumption and the very high production of solid waste, since the water used is recovered in all cases, this waste, apart from assuming a higher purification cost, presents a problem of environmental pollution in case of the looms since it contains iron, and the lime that alters the acidity of the waters, In addition, at the moment it is not possible to separate or recover at this stage of the process. Compared to traditional block cutters, there is an important difference that lies in the cutting height, with a disc we can cut 1.50 meters compared to the diamond wire that can cut any commercial block, apart from the great productive difference that exists.
The water treatment and purification process for this new process is therefore cheaper and less complex.
It is also worth noting that the water needs, although similar to the traditional loom, diamond wire cutting practically eliminates the need to wash the load after sawing, this being much less demanding and both the needs and the water losses during the cutting process are lower.
Another aspect to highlight is that the multi-wire cutter, for an equivalent capacity, the effective energy consumption is lower compared to any of the methods used. This translates into significant energy savings both in implementation and in production costs.
Regarding the consumables, to say that in the multithread cutter there is only one; the diamond wire, of small volume, easy storage and simple supply. The costs derived from storage, stock scheduling and handling are also lower than the strap, shot and lime, necessary for the traditional loom.
In reference to the implementation costs, in the first place the simplicity and the consequent lower cost of the civil works stand out, while in the loom the necessary work constitutes an indispensable part of it, in the multi-wire cutter, this becomes a mere support for it. In addition, in the case of renewal or replacement of the machine, the loom forces the new implementation to be exactly the same model as the previous one, while in the case of the multi-wire cutter there is a high degree of possibility of being able to adapt the existing civil works. In any case, it is important to say that the space occupied by the multiwire cutter is less.
The simplicity of the multi-wire cutter is significantly greater, both in installation, use and handling, as well as in maintenance, both in the mechanical and electrical aspects. It is important to note that the NDF-6870 multi-wire cutter does not use the common solution for vertical movement consisting of a central motor with gearbox, transmissions and angular gearboxes. This is replaced by two independent and electronically synchronized servomotors without coupling between them. This solution, in effect, eliminates the drawbacks of the classic mechanical transmissions, the gaps and possible breakage due to wear and fatigue, and also allows us greater flexibility in the movements to be carried out. In this aspect, it should be noted that the system is capable of working at speeds as slow as one millimeter per minute,
As a practical effect, the NDF-6840/35 cutter is the fastest machine on the market capable of performing a vertical upward movement in the face of any contingency, avoiding undesirable diamond wire marks on the stone.
The surface of the final product sawn with the diamond wire, in addition to the fact that it practically does not need washing, much less the use of acids or harmful chemical products that are dangerous to handle, offers the important advantage that its surface condition can be assimilated to a certain honed In the event that the material must be polished later, a certain reduction in costs associated with the abrasives used in the polishing process and the consequent reduction in production times should be noted.
The high speed of the multi-wire cutter will also allow new users of this technology to schedule production with less notice and greater flexibility than the loom, even allowing a block to be partially cut and the rest to be reserved for a more appropriate time. .
The flexibility of production is also given by the need for clearly lower staff. Preparing the saw on a string saw for a cut consumes less than half the time and less than half the human resources of a traditional strap loom.
With this cutting unit it is intended to integrate the fully automated operation of the primary sawing of stone blocks, with minimal human intervention and therefore a significant reduction in product handling maneuvers, regularization and optimization of the work processes, the increase in production capacity thanks to the reduction of cycle times and the efficient use of downtime, the reduction of energy consumption and the production of waste during the cutting process, and finally the reduction of the associated risks for the personnel involved in the handling and machining of materials throughout each working day.

– WHY BUY OUR CUTTING MACHINE:
The use of diamond wire in primary sawing work has been used in the sector for not many years, and said wire is applied on known machines, normally made up of two pulleys on which a wire is installed. forming a closed loop with which the cuts are made on the stone blocks.
In recent years, machines that use several diamond wires have begun to be used, which are mounted on drums with multiple channels or made up of several pulleys, on which several wires are mounted in order to make several cuts at the same time on the stone blocks, thus obtaining significant productions.
The machines used up to now present different technical problems when it comes to correctly tightening and controlling the loops of wire, in addition to another more significant one, which lies in the possibility of easily varying the position of the pairs of wires with in order to obtain different thicknesses or vary them in the production of boards.
Taking these disadvantages into account, the N.6870 cutter stands out for its simplicity in the device for individual tensioning of the tensioning wheels, and at the same time the variation of processing thicknesses in the slabs and boards to be cut has been simplified in a simple and easy.
NODOSAFER offers its customers, in addition to all the intrinsic characteristics of any wire machine, important improvements such as:
• Architecture based on a robust and compensated structure to avoid vibrations.
• Maximum protection against the penetration of water and dust in the most sensitive parts.
• Helical ball screws of large diameter in the vertical movement for a smooth and precise movement.
• Linear roller recirculation guides on the columns to guarantee the absolute verticality of the cut.
• Servomotors synchronized by software in the vertical movements that ensure smoothness in the cut, low consumption, maximum precision and avoid clearances and problems of the central motorization with transmission and forwarding.
• Large diameter drive drum basic mechanism that prolongs line life.
• Automatic tensioning device by independent pulleys of each one of the threads, with control of position, arrow and tension of each one of the threads.
• Automatic and progressive speed reduction in case of excessive deflection in the line.
• Detection of wire breakage and controlled stop (rapid braking and rising at maximum speed)
• Controlled emergency stop to avoid marks on the cut block.
• Possibility of resuming a cut automatically or semi-automatically.
• Wide range of devices and program functions for operator and machine safety.
• Motorized trolley with optional position control.
• Color operator panel with great ease of use and multiple configuration possibilities.
• Compact electrical panel with the latest technologies.
• High power main motor driven by inverter.
• Button panel for movements in manual mode.
• Automatic lubrication.
- SECURITY
NODOSAFER machines are protected and provide a security closure around their perimeter in accordance with CE security standards.
– BLOCK TROLLEYS
The machine has TWO (2) standard built-in block carriers.