1. The Impact of Grinding Machine Installation and Adjustment on Blade Sharpening:
(1) When installing the grinding machine, ensure stability to prevent vibration; all fasteners must be securely connected, and the grinding wheel should rotate smoothly without wobbling or jumping. Failure to do so will result in blades that cannot be sharpened effectively, potentially leading to defects such as serrated cutting edges.
(2) The grinding wheel must be perpendicular to the horizontal plane; otherwise, the blades cannot be sharpened properly.
(3) The grinding fixture should be positioned 6 mm away from the wheel surface and located at the midpoint of the wheel's radius. Incorrect positioning of the fixture can easily lead to uneven wear on the blade. The length of the suspension rod also plays a role; if incorrect, it shortens the grinding stroke, preventing the blade from being sharpened effectively.
(4) For mechanically driven grinding machines, the V-belt tension must be set to an appropriate level to ensure the grinding wheel reaches its rated rotational speed. A grinding wheel speed that is too low will compromise the effectiveness of the sharpening process.
2. The Impact of Abrasive Composition on Blade Sharpening:
(1) Excessive abrasive (e.g., emery) in the grinding compound: The blade's cutting edge will scrape up a thick layer of abrasive; this causes the edge to wear down rapidly, making it difficult to achieve a sharp finish.
(2) Insufficient abrasive in the grinding compound: The blade becomes difficult to sharpen to a keen edge, and the prolonged grinding time increases the risk of annealing (softening) and deformation.
3. The Impact of Operating Techniques on Blade Sharpening:
(1) Uneven pressure: This causes uneven wear on the blade, resulting in inconsistent sharpness across the individual teeth. Furthermore, applying uneven pressure while oscillating the blade can cause the center of the blade to bulge outward.
(2) Excessive pressure: This easily leads to annealing and deformation of the blade, thereby shortening its service life.
(3) Insufficient pressure: The blade cannot maintain stable contact with the grinding wheel, increasing the likelihood of uneven wear, damage to the teeth, and bulging in the center of the blade.
(4) Excessive oscillation speed: This tends to scrape away the grinding compound and may cause the blade teeth to break. It also makes it difficult to maintain the blade's balance, leading to uneven pressure, uneven wear, and bulging in the center.
(5) Insufficient oscillation speed: This accelerates wear on the blade, shortens its service life, and increases the risk of the blade undergoing annealing.
(6) Short sharpening stroke: This not only fails to effectively sharpen the blade but also causes the center of the grinding wheel surface to become concave rapidly, thereby shortening the service life of the grinding wheel. Therefore, the sharpening stroke should be kept as long as possible.
(7) Excessive sharpening time on a grinding wheel fitted with abrasive cloth: This makes the blade prone to annealing and deformation.