First of all, before inspection, the blade should be sandblasted or lightly ground to remove the solder and impurities adhering to the surface of the blade, and cleaned with kerosene. The items and requirements to review are as follows:
1. Check the strength of the weld seam. Grind a little behind the shredder blade with a green silicon carbide wheel to see how thick the solder layer is. The thickness is required to be below 0.15 mm. There should be no air holes and a lack of solder on the bottom surface of the tooltip support, and the weld that is not filled with solder should not exceed 10% of the total length of the weld.
2. Check the orientation of the shredder blade in the knife pocket. If the blade misalignment and sagging exceed the specified range, re-welding should be carried out.
3. Check the weld strength. Use a wooden hammer or copper hammer to hit the blade with moderate strength, or use a hammer to hit the blade with strong force. If the blade does not fall from the groove, it is qualified. Check the blade welding strength, do not need to check them one by one.
4. Check the flatness of the shredder blade. If there are obvious pits on the blade, it means that the blade is overheated and deformed, and the new blade should be removed and re-welded.
5. Check for cracks. After the shredder blade is cleaned with kerosene if the blade has cracks. The kerosene penetrates into the cracks and black lines appear, which can be observed with the naked eye and can also be checked with a 10-40 times magnifying glass.
How to check whether the shredder blade is cracked？
The blade of the shredder is one of the core components of the shredder, and its quality determines the quality of the equipment.
If the blade has cracks, it will cause the blade to crack when shredding boredom, so we must know how to check the blade for cracks
After the shredder blade is cleaned with kerosene if the blade has cracks. The kerosene penetrates into the cracks and black lines appear, which can be observed with the naked eye and can also be checked with a 10-40 times magnifying glass.
Check the crack of the blade, and the color flaw detection method can also be used. Put the blade of the turning tool in the solution for 10-15 minutes, then wash it with water, apply a layer of white clay, and observe its appearance after drying, if there is a crack on the blade, the color of the solution will appear on the white clay, It can be seen with the naked eye that the cracked shredder blade cannot be used and needs to be re-welded.
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