The factors influencing the efficiency and lifespan of diamond circular saw blades used in stone-cutting machines include sawing process parameters, as well as characteristics of the diamond itself—such as grit size, concentration, and bond hardness. Key sawing parameters include the blade’s linear speed, cutting depth, and feed rate.
Sawing Parameters
(1) Blade Linear Speed:
In practical operations, the linear speed of a diamond circular saw blade is constrained by equipment capabilities, blade quality, and the specific properties of the stone being cut. To achieve the optimal balance between blade lifespan and cutting efficiency, the linear speed should be selected based on the characteristics of the particular stone material. When sawing granite, the blade’s linear speed is typically selected within the range of 25 m/s to 35 m/s. For granite varieties with a high quartz content—which are inherently more difficult to cut—it is advisable to select a linear speed at the lower end of this range. When manufacturing granite tiles, where smaller-diameter diamond circular saw blades are typically employed, the linear speed can reach up to 35 m/s. (Keywords: Diamond Stone Saw, Circular Stone Saw, Edging Machine, Stone Cutter, Trimming Machine, Mid-range Cutter, Hydraulic Stone Saw, Stone Grooving Machine)
(2) Cutting Depth:
Cutting depth is a critical parameter that directly impacts diamond wear, cutting effectiveness, the mechanical stress exerted on the blade, and the interaction with the properties of the stone being cut. Generally speaking, when the linear speed of the diamond circular saw blade is high, a shallow cutting depth should be selected; based on current technological standards, the cutting depth for diamond blades can typically be set within the range of 1 mm to 10 mm. When using large-diameter saw blades to cut granite blocks, the cutting depth is typically controlled within the range of 1 mm to 2 mm, and the feed rate should be reduced accordingly. Conversely, when the linear speed of the diamond circular saw blade is relatively low, a greater cutting depth may be selected. However—provided that the performance capabilities of the stone-cutting machine and the structural integrity of the blade allow—one should generally aim to utilize the maximum feasible cutting depth to maximize cutting efficiency. If, however, specific requirements exist regarding the surface finish of the processed stone, a shallower cutting depth should be employed.
(3) Feed Rate:
The feed rate refers to the speed at which the stone material being cut is advanced into the saw blade. Its magnitude influences the sawing rate, the stress exerted on the saw blade, and heat dissipation within the cutting zone. The specific value selected should be determined based on the properties of the stone being cut. Generally speaking, when sawing softer stones—such as marble—the feed rate can be appropriately increased; conversely, if the feed rate is kept relatively low, it tends to be more conducive to achieving a higher sawing rate. When sawing granite with a fine-grained, relatively homogeneous structure, the feed rate can be increased; however, if the feed rate is too low, the diamond cutting edges are prone to becoming blunted. In contrast, when sawing granite with a coarse-grained structure and uneven hardness, the feed rate should be reduced; otherwise, excessive vibration of the saw blade may occur, leading to diamond fragmentation and a consequent reduction in the sawing rate. For granite cutting, the feed rate is typically selected within the range of 9 to 12 meters per minute.
Other Influencing Factors
(1) Diamond Grit Size:
Commonly used diamond grit sizes fall within the range of 30/35 to 60/80. The harder the rock, the more advisable it is to select a finer grit size. This is because, under equivalent pressure conditions, finer diamond particles are sharper, facilitating penetration into hard rock. Furthermore, large-diameter saw blades—typically used in heavy-duty stone sawing machines—prioritize high cutting efficiency; therefore, a coarser grit size (e.g., 30/40 or 40/50) is generally preferred. Conversely, small-diameter saw blades—which typically operate at lower cutting efficiencies—prioritize a smooth cut surface finish; thus, a finer grit size (e.g., 50/60 or 60/80) is recommended. [Keywords: Diamond Stone Saw, Circular Stone Saw, Edge Grinding Machine, Stone Cutting Machine, Edge Trimming Machine, Mid-Sized Cutter, Hydraulic Stone Saw, Stone Slotting Machine]
(2) Diamond Concentration:
“Diamond concentration” refers to the density of the diamond distribution within the matrix of the working layer (specifically, the weight of diamond contained per unit area). Industry standards stipulate that when 4.4 carats of diamond are contained within one cubic centimeter of the working matrix, the concentration is defined as 100%; when 3.3 carats of diamond are contained within the same volume, the concentration is defined as 75%. Volume concentration indicates the proportion of the total volume occupied by diamonds within the bond matrix. By convention, a concentration of 100% is defined as the point where the diamond volume constitutes one-quarter (1/4) of the total volume. Increasing the diamond concentration is expected to extend the service life of the saw blade, as a higher concentration effectively reduces the average cutting force exerted on each individual diamond grain. However, increasing the concentration inevitably raises the cost of the saw blade; consequently, there exists an optimal, most economical concentration—a value that tends to increase in tandem with the cutting rate.
(3) Hardness of the Segment Bond:
Generally speaking, the higher the hardness of the bond matrix, the greater its resistance to wear. Therefore, when sawing highly abrasive rocks, a high bond hardness is recommended; when sawing softer rocks, a lower bond hardness is preferable; and when sawing rocks that are both hard and highly abrasive, a moderate bond hardness is advisable.
(4) Force Effects, Thermal Effects, and Wear:
During the process of cutting stone, a diamond circular saw blade is subjected to various alternating loads, including centrifugal forces, cutting forces, and cutting-induced heat. The wear and degradation of the diamond circular saw blade are primarily caused by the combined influence of these mechanical force effects and thermal effects.
