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The sharpness of mechanical blade edge products
- Sep 01, 2018 -

The sharp cutting edge products become dull in use and gradually lose their original sharpness. Passivation is the main form of failure of such products. The household scissor, kitchen knife, blade... in the hardware products The failure modes of such products are mostly passivation failures. Even the decline of cutting performance of machine tools is directly related to the passivation of the cutting edge (deformation, wear, blade breakage, tissue change, etc.). In the past, people used to judge whether the cutting edge was sharp or dull by means of hand perception, etc. In the early 1980s, people used the cutting edge to cut the triangle belt and then cut the old ginger, and saw that the cut surface of ginger was still silk, to roughly determine whether it was still sharp. However, this method, due to manual operation of mechanical blades, is not only different in terms of strength, but also different in terms of operation by the same person. Therefore, it brings great subjectivity and is not a scientific test method. Later, some people switched to food machinery to test their sharpness, which was a step forward. As the sharpness was affected by many factors, the results of this test were often not completely consistent with people's feeling effect.A cutting tool cutting machine is developed to measure the power used to overcome resistance consumption during cutting. The smaller the amount of work required to complete a single cut, the sharper the blade. On the contrary, the greater the power consumption, the more dull the blade.Physical significance and test method of sharpness"Sharpness: when cutting tools segment objects, they are subject to small resistance and high strength."According to this view, that is the size of the resistance measurement of sharpness tester have many, such as Japan (JISO201-1976) regulation of medical class with a knife sharpness tester, the tester USES the balance as the main body, in one end of the scale and a water tank, the other end to a hanging fixture, a tight nylon yarn on the hanging fixture, cutting tools are fixed above the nylon yarn. During the test, slowly water the tank until the nylon wire is cut off. The weight of the water in the tank represents the cutting edge value. The Japanese cutting edge tester measures the vertical and horizontal resistance to characterize the cut edge. In addition, the medical scissor sharpness tester specified by the Japanese industrial standard (JIST0202) is characterized by the cutting force of copper wire.