Knife sharpening machine sharpness is affected by many factors. The following content outlines several main factors affecting the sharpness of the sharpening machine. Let’s take a look!
First, the impact of grinding machine installation and adjustment on knife sharpening
(1) Grinding machine installation should pay attention to stability to prevent vibration. Fasteners should be firmly connected. The grinding knife plate should rotate smoothly to prevent jumping and swinging. Otherwise, blades will not be sharp and may have serrated edges, etc.
(2) The grinding knife plate should be vertical to the horizontal plane; otherwise, blades will not sharpen properly.
(3) The grinding frame position should be 6mm from the disk surface, located in the middle of the disk radius. An incorrect grinding frame position can easily cause biased blade grinding. The length of the boom also affects the grinding stroke; a short stroke results in blades that are not sharp.
(4) For mechanical drive type knife grinding machines, the V-belt should have appropriate tension, and the grinding disk should reach rated speed. Low grinding disk speed affects the sharpening effect.
Second, the impact of abrasive composition on knife sharpening
(1) Too much emery in the abrasive: The blade edge scrapes up a very thick layer of emery, the edge wears easily, and the blade is not easy to sharpen.
(2) Too little emery in the abrasive: The blade is not easy to grind sharp, grinding time is long, and the blade is prone to annealing and deformation.
Third, the impact of knife grinding operation method on knife sharpening
(1) Uneven pressure causes biased blade grinding. The sharpness of each tooth becomes inconsistent. When swinging the blade, uneven pressure can cause bumps on the blade.
(2) Too much pressure can easily cause blade annealing and deformation, shortening the blade’s life.
(3) Too little pressure prevents the blade from fitting smoothly on the grinding disc, easily producing partial grinding, tooth chipping, and middle bulging.
(4) Swing speed too fast: easily scrapes off abrasive, easily breaks knife teeth, makes it difficult to maintain blade balance, resulting in uneven pressure, partial grinding, and intermediate bumps.
(5) Swing speed too slow: accelerates blade wear, shortens blade life, and can easily cause blade annealing.
(6) Grinding stroke too short: blades will not be sharp, and the middle of the grinding disk surface will become dented quickly, shortening the grinding disk’s service life. Therefore, the grinding stroke should be as long as possible.
(7) Grinding too long on the abrasive cloth attached to the grinding disc: the blade can easily anneal and deform.
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