This article starts with the hardness and toughness of the blade. Opening angle. The angle of chopping and other aspects will reveal the mystery of chopping, hoping to improve everyone’s understanding and understanding of the properties of steel.
1. Blade: The performance requirements for the blade of a long knife and a short knife are different. The long knife usually needs to block and collide with other swords in the fight, so the blade needs to have a certain elasticity, and the blade must also have a certain toughness, not as hard as possible. Short knives
are usually not used for intense fighting, so the blade has high rigidity, and the hardness of the blade can be slightly larger, but it is not as hard as possible (the hardness of the blade is not only determined by the composition of the blade steel itself, but also needs to be quenched to increase the hardness The easiest and most reliable way to determine the hardness of the cutting edge is to use a dedicated file test, but experience is required). If the toughness of the blade is insufficient, the hard blade will chip, which is the most difficult damage to repair. If the blade is too soft, it may cause a large curling edge, which is also difficult to recover, so it is impossible for a good knife to have a high-steel edge like an alloy file or a utility knife. The knives that cut off each other. The story of cutting the boulder is mostly performed. Usually, the edge hardness of a good knife should be above 50S Rockwell hardness and below 60S. In short, the higher the hardness, the higher the wear resistance, but also the greater the brittleness.
2. Kaifeng: According to different uses, the grinding requirements of tools are also different. The so-called cutting ability, in addition to the hardness and toughness of the blade, the angle of the cutting edge during grinding is very important. Let’s take the Japanese Japanese sword as an example. The Japanese call the tip of the knife “cut first” (the sharpest part of the knife). According to the length, the cut first can be divided into large ones. middle. Small. There are several kinds of pig heads, etc. The blade with a length of less than 30mm is called “pig head blade”. The angle of the blade is large and thick when grinding, which is not conducive to assassination and cutting, but it is suitable for cutting hard objects within the armor. . Similarly, in order to assassinate the cut Japanese sword, the angle of the blade is small and thin when the blade is ground, and the big cut is usually used. This knife is very sharp and unusually sharp. But it is not convenient to cut hard objects, otherwise it is easy to lose the edge or curl the blade. This principle has long been known to many street vendors. In the past, there were often hawkers selling kitchen knives on the streets. They used the kitchen knife to chop the iron wire to show that the steel edge of the knife was good. In fact, if you look closely, you will know that the kitchen knife used to chop the iron wire has either a thick blade and a large angle, or a thin blade that is not sharpened. , This kind of edge is only suitable for chopping hard objects, and it is very laborious to cut a piece of meat. This shows the importance of the opening angle to the cutting ability, that is to say, there is no such deified treasure knife that can be decisive and incomparably sharp. Each knife can only focus on one of the functions of cutting hard objects or soft objects, which is determined from the beginning of the grinding process.
3. Chopping: Even if there is a good knife, the cutting effect still depends on the skill of the user. Use your waist when cleaving. leg. The strength of the arms is coordinated to increase the strength and speed of the cleaver. In addition, be good at choosing the angle of contact between the blade and the target. For example, when using green bamboo as a test cut, it is generally considered that about 45 degrees is the best. If the angle is greater than 60 degrees, then the blade is likely not to cut deeply and cannot be cut neatly. If it is less than 30 degrees, the blade may slip from the target surface. Pass.