A blade is a part of a cutting tool, weapon, or machine whose edge is designed to pierce, cut, or scratch the surface of a material. The quality inspection is crucial for a good blade.
1、 Check weld strength: Use a green silicon carbide grinding wheel to grind the back of a turning tool and check the thickness of the solder layer, which should be below 0.15 millimeters. There should be no air holes or insufficient solder at the bottom surface of the tool tip support. The weld seam that is not filled with solder should not exceed 10% of the total length of the weld seam. If there are pores, the blade will fall off during cutting.
2、 Check the position of the blade in the slot: if the blade is misaligned or sagging beyond the technical specifications Re welding should be performed.
3、 Check welding strength: Use a wooden hammer or copper hammer to strike the blade with moderate force, or use an I-hammer to strike the blade shaft with strong force. If the blade does not fall off from the groove, it is considered qualified. Check the welding strength of the blades, not checking them one by one, but also using spot checks.
4、 Check the flatness of the blade: If there are obvious pits on the blade, it indicates that the blade is overheated and deformed, and should be burned down and re welded with a new blade.
5、 Check for cracks: If there are cracks on the blade after cleaning with kerosene Kerosene penetrates into the cracks and black lines appear, which can be observed with the naked eye. It can also be observed with a magnifying glass of 10-40 times.
To check for blade cracks, color inspection method can also be used: a solution made of 65% kerosene, 30% transformer oil, and 5% turpentine oil, with a slight addition of Sudan Red. Place the cutting tool blade in the solution for 10-15 minutes, then rinse with clean water and coat it with a layer of white clay (kaolin). After drying, observe its surface. If there are cracks on the blade, the color of the solution will be visible on the white clay with the naked eye. The blade with cracks cannot be used and needs to be re welded.
