As we all know, the higher the speed of operation, the greater the wear and tear, and the speed of wear will also increase. At the same time, the technical thermal fatigue will cause the hardness to decrease. Once the limit is reached, the knife is easily blunt. If it is not maintained in time, blades can not be used anymore.
Grinding the blade also needs to pay attention to. When grinding the cutting edge, it is best to use the water milling method. Generally, it is cooled with water. A lot of heat will be generated during the grinding process, and water can play a cooling role. The hardness of shear slitter knives can be restored by these chemical principles.