Paper cutter blade maintenance and sharpening
Blade sharpening
The cutting performance of mechanical blades depends on the quality of sharpening to a considerable extent, and the quality of sharpening depends on the sharpening equipment and reasonable sharpening process. For sharpening equipment, it is recommended to use a vertical shaft sharpener, as the angle of the blade is easy to ensure. It is recommended to choose white corundum (code name WA) for the grinding wheel. It is not easy to generate heat during sharpening. At the same time, coolant must be continuously poured on the contact surface of the cutting edge and the grinding wheel during sharpening. The cutting edge is strictly prohibited from overheating and discoloring. It is recommended to use No. 1 metal emulsion. The whole sharpening process is best divided into rough grinding, fine grinding and smoothing. The rough and fine grinding are carried out on the sharpener, and the smoothing needs to be carried out by the sharpener and manually.
The steps of smoothing are:
1. It is considered that the blade has been sharpened (no sparks are seen). At this time, there is no need to feed the knife. Let the sharpener reciprocate several strokes by itself. The stroke depends on the length of the blade, and the stroke is as short as possible.
2. Remove the blade from the sharpener and use oilstone for manual grinding to obtain an excellent sharp edge. The method is to use oil-soaked oil stone to gently remove the tiny burrs on the cutting edge produced by the sharpening machine, and to move the oil stone close to the rake face to rotate the oil stone to the full length of the blade.
3. Use the same method to move the whetstone to the flank surface of the full length of the blade, but tilt the whetstone at an angle, preferably not more than 1°, after sharpening according to the above method, an ideal blade is considered to be completed. Wedge angle is also called cutting edge angle. It is the main angle that directly affects the cutting performance. The size of the angle depends on the cut object.
The paper cutter is a necessary equipment for printing enterprises, and it is also widely used in many industries such as printing and publishing, papermaking, packaging, decoration and decoration, etc., and it is widely used. Its most basic function and application is cutting. The final cutting element is the blade. On the one hand, the quality of the blade and whether the use is reasonable directly affect the cutting quality, on the other hand, the unreasonable sharpening angle and use will seriously damage the accuracy and life of the paper cutter. Therefore, the use of maintenance and sharpening of the blade is the first step in the application and maintenance of the paper cutter.
The material and composition of the paper cutter blade
The blade of the paper cutter is made of two parts, the blade and the knife body, through high-temperature inlay welding. The blade part usually adopts HSS (HIGH SPEED STEEL) or high-hardness chromium tungsten manganese CrWMn steel, and individual carbides are used. The body part of the knife is usually made of low carbon steel. After the blade is quenched, the hardness of the blade can reach 60-64HRC.
