The tooth profile of diamond saw blades is a crucial element in their design, directly determining the blade's cutting efficiency, service life, cut surface quality, and suitability for various materials.
The tooth profile does not refer to the shape of individual diamond particles, but rather to the overall serrated configuration formed by the grooves designed on the cutting edge for chip evacuation and cooling.
1. Core Purpose and Function
The integral serration profile on diamond saw blade heads serves the primary purposes of chip evacuation, cooling, noise reduction, vibration damping, and guiding stability.
1) Chip evacuation: During cutting, promptly removes generated powder and debris to prevent blade jamming or overheating.
2) Cooling: Provides channels for cooling water (or air) to directly cool the diamond cutting edge and substrate, preventing graphitisation of the diamond or edge detachment due to high temperatures.
3) Noise and Vibration Reduction: Specialised tooth profiles minimise air turbulence and vibration during cutting, thereby reducing noise levels.
4) Guidance and Stability: Certain tooth geometries enhance cutting guidance, ensuring straight-line cutting accuracy.
2. Principal tooth profiles and their characteristics
1) Continuous tooth profile
Appearance: The cutting edges are joined end-to-end, forming a complete circle without any grooves.
Advantages: Produces exceptionally smooth cut surfaces with minimal chipping. Offers high rigidity and low vibration. Suitable for wet cutting, as coolant can flow along the flanks.
Disadvantages: Poor chip evacuation, unsuitable for dry cutting. Relatively high cutting resistance.
Typical Applications: Precision cutting and edge finishing of brittle materials such as ceramic tiles, glass, marble, and jade.
2) Segmented Tooth Profile
This is the most common and versatile type, where the cutting edge is divided into independent segments by grooves.
A. Flat Teeth
Appearance: All cutting edges are uniform in height and width, with evenly spaced grooves.
Advantages: Highly versatile, delivers smooth cutting action, suitable for most conventional materials.
Applications: Concrete, asphalt, granite, refractory bricks, etc.
B. Alternating Teeth
Appearance: Alternating high 'stepped teeth' and low 'flat teeth'. Stepped teeth protrude for primary cutting; flat teeth are slightly lower for finishing and protection.
Advantages: High cutting efficiency with deep stepped-tooth grooves for effective chip removal. Flat teeth provide secondary finishing for smoother surfaces. Reduces overall cutting resistance and extends service life.
Applications: Extremely versatile, particularly suited to highly abrasive materials such as granite, reinforced concrete, and hard stone.
C. Turbine Teeth
Appearance: The cutting edge features turbine-like wavy or inclined grooves extending from top to bottom.
Advantages: Exceptional chip evacuation and cooling capability, as the grooves act like a propeller to 'pump' debris out. Highly suitable for dry cutting, as air is effectively drawn into the cutting zone for heat dissipation. Achieves rapid cutting speeds.
Applications: Dry cutting of concrete, brick, and stone; commonly used tooth profile for angle grinders and wall saws.
D. Narrow Water Groove Teeth/Dense Teeth
Appearance: Numerous cutting teeth with narrow, shallow grooves.
Advantages: Smooth cutting action, minimal vibration, and high-quality cut surfaces.
Applications: Cutting thin-format tiles, ceramics, porcelain tiles, and other materials prone to chipping, as well as metal materials like cemented carbide.
E. Wide Water Groove Teeth/Coarse Teeth
Appearance: Few cutting edges with wide, deep grooves.
Advantages: Exceptionally large chip clearance space, excellent heat dissipation, suitable for deep cuts and high-efficiency removal.
Applications: Soft, viscous materials such as asphalt, aerated concrete, refractories, green concrete, etc.
3) Specialised Teeth (Non-Standard Tooth Profiles)
A. Hawk-Beak Teeth
Appearance: The cutting edge forms a sharp, eagle-beak or hook-like profile.
Advantages: Exceptionally sharp penetration, minimal cutting resistance, and highly efficient performance.
Applications: Fibre-reinforced composites (e.g., fibreglass, carbon fibre), asphalt, laminates, etc.
B. M-Shaped Teeth/Double-Edged Teeth
Appearance: A single cutting edge split at the centre to form two smaller cutting edges, resembling the letter 'M'.
Advantages: Provides smoother cutting action with reduced vibration, effectively minimising chipping.
Applications: Cutting high-quality tiles, marble, and double-glazed materials.
