1. Grinding Efficiency And Cutting Ability
(1)Relationship between concentration and grinding rate
1)Within a certain range, increasing diamond concentration will improve the grinding efficiency of the grinding wheel, but when the concentration is too high (such as exceeding a reasonable threshold), the gap between particles will decrease, resulting in increased extrusion between particles, which will reduce the cutting efficiency.
2)For example, the diamond concentration of resin-bonded grinding wheels is usually recommended to be 75%~100%, which can maintain efficient cutting while avoiding the inability of abrasive particles to effectively participate in grinding due to excessive density.
(2)Material Compatibility
1)When processing high-hardness materials such as cemented carbide and ceramics, a higher concentration (such as 100%~150%) is required to enhance cutting force and accelerate material removal;
2)For tough materials (such as stainless steel), too high a concentration can easily cause the grinding wheel to wear too quickly, and the concentration needs to be reduced to reduce the risk of abrasive grain shedding.
2. Surface Quality And Machining Accuracy
(1)Surface roughness control
1.Low-concentration grinding wheels (such as 25%~50%) perform better in fine grinding and polishing. Due to the small cutting force, they can reduce scratches and chipping on the workpiece surface and improve the finish6.
2. For example, when fine grinding carbide tools, using a 75% concentration resin grinding wheel can balance efficiency and surface quality.
(2)Dimensional accuracy maintenance
1.High-concentration grinding wheels have a high abrasive density and a higher stability in the grinding process, which is suitable for scenes with strict dimensional tolerance requirements; but it should be noted that too high a concentration may cause the grinding wheel to be too hard, affecting self-sharpening.
III. Service Life And Economy
(1) Concentration and wear balance
1. Increasing diamond concentration can extend the life of the grinding wheel (e.g., the life of a high-concentration grinding wheel is more cost-effective than that of a low-concentration one), but it requires the strength of the bond to support it, otherwise the abrasive particles will easily fall off.
2. For example, when the ceramic bond grinding wheel uses a concentration of 100%~200%, the bond has a stronger grip on the abrasive particles and is suitable for heavy-duty grinding.
(2) Cost optimization strategy
1. Too high a concentration will increase the manufacturing cost and replacement frequency of the grinding wheel. The optimal cost-effective range should be selected according to the processing requirements. For example, a lower concentration (75%) can be used for rough processing of ordinary steel, while a high concentration (100%~150%) is required for high-value-added cemented carbide processing to reduce the overall cost.
IV. Adaptability Of Binder
1. Resin binder: 75%~100% concentration is recommended, taking into account self-sharpening and abrasive retention, suitable for fine grinding and polishing;
2. Vitrified binder: A higher concentration (100%~200%) is required to match its high bonding strength, adapting to high-speed and heavy-load scenarios;
3. Metal binder: 75%~150% concentration is commonly used, suitable for cutting superhard materials, but the concentration needs to be controlled to avoid grinding wheel clogging.
V. Adjustment For Special Working Conditions
High-speed grinding: The concentration needs to be appropriately reduced to reduce impact wear, such as selecting 75% concentration for resin grinding wheels at high speeds;
Insufficient cooling: High-concentration grinding wheels are prone to thermal damage due to poor heat dissipation, and need to be used with high-efficiency coolants;
