Can hard stones be cut with an ultra-thin multi wire saw machine?
While hard stones such as granite, basalt, and quartz have a Mohs hardness of 6-8, they can still be cut using ultra-thin multi-wire saws. Cutting these high-hardness stones significantly increases the cutting resistance of the wire saw. Using conventional stone cutting methods can easily lead to frequent wire breakage, rough cut surfaces, and soaring energy consumption per unit area. Therefore, it is necessary to specifically address the three core issues of low cutting efficiency, rapid wire saw wear, and easy drift in precision.
Core Feasibility: Supported by the "hard cutting" capability of ultra-thin multi-wire saw machine
For cutting high-hardness stone, ultra-thin multi-wire saws preferentially use 0.5-0.8mm abrasives; for ultra-thin slabs (3-5mm), 0.3-0.5mm abrasives are optional. Although less rigid, they are fully adapted to the cutting needs of high-hardness stone through "abrasive upgrades + equipment enhancement + process optimization."
Diamond, with a Mohs hardness of 10, is the core abrasive for efficiently cutting high-hardness stone. Through optimizations such as resin bonding and multi-layer arrangement, the abrasive maintains its self-sharpening properties under high resistance, preventing rapid dulling.
High-hardness cutting requires greater cutting forces; therefore, a dual-column structure is preferred, paired with ceramic guide wheels and a servo tensioning system to ensure the wire saw does not deviate or vibrate under high tension of 15-18N.
Through "cutting force sensors + variable frequency motors," the feed and wire saw speed are adjusted in real time to handle hard points in the stone (such as quartz crystals in granite), balancing efficiency and wire saw lifespan.
Currently, the industry has achieved the ability to cut granite with a hardness of 7 (such as Sesame Black and China Black) and quartz stone with a hardness of 8 using ultra-thin multi-wire saws, stably producing ultra-thin slabs of 3-10mm. The cutting accuracy (thickness deviation ±0.03mm) and surface flatness (wavy texture ≤0.02mm/m) both meet the needs of high-end processing.
Key Adaptation Solutions: Addressing three core pain points
1. High-wear-resistant diamond wire suitable for high-hardness wear.
High-hardness stone easily causes rapid wear of the diamond wire abrasive, requiring upgraded wire saw performance:
• Abrasive type: Resin-bonded diamond wire is preferred, its elastic buffering properties reduce the impact between the abrasive and hard points, reducing the breakage rate by 30%, extending the effective cutting cycle to 700-800 meters when cutting granite, and reducing wire consumption costs by 40%;
• Abrasive parameters: 60-80 mesh coarse-grained diamond is selected, with a large single-grain cutting area, quickly biting into high-hardness stone; a spiral multi-layer arrangement is adopted (abrasive density is 50% higher than ordinary wire saws), increasing the cutting speed by 25%;
• Substrate upgrade: The diamond wire substrate uses high-carbon steel wire + nickel alloy plating (tensile strength ≥3000MPa), avoiding tensile deformation under high tension, and controlling dimensional deviation within ±0.02mm.
2. Equipment Configuration: Enhancing rigidity and stability to resist high cutting resistance
During wire sawing of high-hardness stone, the contact force between the diamond wire and the stone is as high as 15-20N, which is twice that of soft stone. Therefore, hardware upgrades are necessary to ensure cutting accuracy. This includes: the machine body structure uses 40Cr tempered columns to control the beam deflection to ≤0.01mm/m and the wire saw parallelism error to ≤0.02mm, effectively avoiding machine body deformation caused by high cutting forces; the guide wheel system uses silicon nitride ceramic guide wheels with a hardness of HRC 65 and wear resistance 10 times that of steel, with a V-groove machining accuracy of ≤0.005mm, and is equipped with double-row angular contact sealed bearings with radial runout ≤0.002mm, thereby limiting the diamond wire aberration to within ≤0.008mm; in terms of tensioning and driving, the tensioning mechanism driven by a servo motor and ball screw achieves a tension control accuracy of ±0.1N, ensuring uniform tension for 80-120 diamond wires, while using a 15-18kW variable frequency drive motor to ensure that the temperature does not exceed 60℃ under high load and maintain a stable speed.
Process Parameters: Low-speed stable cutting + dynamic adaptation, balancing efficiency and lifespan
Following the principle of "low-speed, stable cutting, and force control as a priority," the core parameters are set as follows:
• Cutting speed: Controlled at 30-35 m/s to avoid excessive abrasive dulling due to high speed. 10 m/s is the optimal value for "efficiency-lifespan" when cutting grade 7 granite.
• Feed rate: Base speed 0.6-1.0 mm/min, using closed-loop cutting force control, threshold set at 15-20 N. Automatic speed reduction when encountering hard points (e.g., from 0.8 mm/min to 0.5 mm/min), and appropriate speed increase in soft textured areas.
• Cutting fluid supply: High-pressure double-sided spray (pressure 0.6-0.8 MPa) to flush away dust such as quartz sand; addition of ethylene glycol low-temperature coolant (controlling wire saw temperature ≤40℃) and extreme pressure agent to reduce cutting resistance by 15%.