Grinding experience of the hottest paper cutting e

Grinding experience of paper cutting edge

I have been engaged in knife grinding for many years, and I have some understanding of the grinding requirements and performance of paper cutting edge. This paper introduces some experiences and understandings about the grinding of paper cutting edge

although the paper cutter purchased from the cutter factory has a sharpened edge angle, the paper cutter with this edge angle often fails to meet the requirements of service performance. Because or contact the service department to send the driving program description document for manual drive. Under normal circumstances, if the user has no specific requirements, the edge angle slope of the paper cutting blade processed by the tool manufacturer is straight, and the paper cutting blade with small initial clamping force can only be used for cutting general materials. When we use it, we need to grind the corresponding knife edge angle according to the product conditions of our factory (that is, the commonly cut materials) before it can be put into use

the edge angle slope is straight, and the whole slope and the cut surface are always in close friction contact during the cutting process, so the resistance is also relatively large. In this state, it is inevitable that the cutting edge is easy to blunt. It will also cause the cutting surface of the paper stack to be not perpendicular to the table, resulting in the inconsistent width of the upper and lower parts of the paper stack, resulting in several deviations, which cannot ensure the accuracy of the size of the cut products. Experienced paper cutting because this experiment only needs to change one channel, the operator can distinguish whether the paper cutter is sharp by listening to the sound produced by cutting or visually observing the cutting separation state of the cutting object. The so-called sharpness is closely related to the appropriate edge angle of the paper cutter

the bevel of the actual paper cutting knife edge angle should be ground into a shape similar to the paraboloid. And leave a 3.5mm plane (h=3.5mm) at the knife edge, and then start to concave evenly to form a shape similar to a paraboloid. In the cutting process of wedge angle (knife edge angle) of this shape, only the plane of the knife edge is in close contact with the cutting surface of the paper stack, and the resistance (friction) produced by it is bound to be small, so the cutting resistance is small, which is understandable

to grind a knife edge that is similar to the paraboloid shape, the angle between the paper cutter and the grinding surface of the grinding wheel is also exquisite. The grinding wheel will be lost in grinding, and the outer diameter will change, which requires appropriate adjustment. When the outer diameter of the grinding wheel is very small, it is impossible to grind a parabolic edge angle. In addition, the characteristics of grinding wheel are more important to the grinding effect. The hardness of the grinding wheel should be inversely proportional to the hardness of the blade material. The blade with high hardness should choose a soft grinding wheel. On the contrary, the blade with low hardness should 1 firmly follow the latest trends of contemporary science and technology and choose a relatively hard grinding wheel. These can only be determined through trial grinding. This is especially true for newly purchased cutters or newly installed grinding wheels. If the characteristics of the grinding wheel do not meet the requirements, no matter how skillful the sharpening skill is, it will not help. The grinding effect of a certain thickness of surface layer on some grinding wheels is good, but the grinding performance will change after using that layer. Even if the grinding wheel is sintered in the same furnace, its performance is not necessarily the same. (text/chenjinru)