How to inspect the quality of the cutting machine blade and how to adjust it
Release Time: 1/16/2026 5:44:19 PMBy SENCO
The items and requirements for inspecting the welding quality of the shearing machine blade are as follows:
1. Check the weld strength: Use a green silicon carbide grinding wheel to grind the back of a cutting tool and check the thickness of the solder layer. The thickness should be less than 0.15 millimeters. There should be no pores or insufficient solder at the bottom of the tool tip support surface, and the weld seam with insufficient solder filling 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 blade slot: If the blade is misaligned or droops beyond the technical requirements, it should be re-welded. Shearing machine blade。
3. Check the welding strength: Use a wooden hammer or copper hammer to strike the blade with moderate force, or strike the blade rod with a hammer with strong force. The blade should not fall out of the blade slot as a qualified product. Check the welding strength of the blade, it is not necessary to check each one individually, and a random inspection method can be adopted.
4. Check the flatness of the blade: If there are obvious pits on the blade, it indicates that the blade has overheated and deformed. The blade should be removed and a new one should be welded.
5. Check the cracks: After cleaning the blade with kerosene, if the shearing machine blade has cracks, kerosene will penetrate into the cracks and appear black lines, which can be observed with the naked eye. Or use a 10-40 times magnifying glass for observation. Check the cracks of the blade, you can also use the color flaw detection method: Mix 65% kerosene, 30% transformer oil and 5% turpentine to form a solution, add a little safran. Place the blade part of the cutting tool in this solution for 10-15 minutes, then wash it with clean water, apply a layer of white clay (kaolin), and dry it. Observe the surface after baking. If there are cracks on the blade, the color of the solution will show on the white clay with the naked eye. Cracked blades cannot be used and need to be re-welded.
1. Remove the lower blade, clean each one separately.
2. The blade can be used on all four sides. Select the good side and install it firmly. Check the straightness in both the horizontal and vertical directions.
3. Remove the upper blade, clean each one separately. The same as above, the blade can be used on all four sides. Select the good side and install it firmly. Check the straightness in both the horizontal and vertical directions.
4. The upper blade is fixed and cannot be adjusted. We adjust the gap of the shearing machine blade by adjusting the lower blade.
5. Find the two left and right adjusting screws for widening the gap of the lower blade, they are usually at the outermost side. 6. Find the two tightening screws for advancing the lower blade and narrowing the gap, there is a locking locking nut on the top. Usually on the inner side.
7. Loosen the four bolts on the lower blade platform.
8. Manually rotate the upper blade to the appropriate position. The operator goes to the blanking area of the shearing machine to start the adjustment.
9. Use a feeler gauge to start coarse adjustment from the position where the upper and lower blades do not bite each other to 0.5 millimeters.
10. Manually rotate the upper blade to the middle position and start coarse adjustment to 0.5 millimeters.
11. Manually rotate the upper blade to the position where the upper and lower blades are not separated and the right side is not lifted, and start coarse adjustment to 0.5 millimeters.
12. Manually rotate the upper blade to the appropriate position and start fine adjustment.
13. Start fine adjustment from the position where the upper and lower blades do not bite each other with a feeler gauge to the point where three threads can enter five threads but cannot enter.
14. Start fine adjustment from the middle position of the upper blade to the position where the upper and lower blades are not separated and the right side is not lifted, and start fine adjustment to the point where three threads can enter five threads but cannot enter.
15. Start fine adjustment from the position where the upper and lower blades are not separated and the right side is not lifted to the middle position of the upper blade, and start fine adjustment to the point where three threads can enter five threads but cannot enter.
16. For new blades, fine adjustment is to the point where three threads can enter five threads but cannot enter.
17. For old blades, fine adjustment is to the point where ten threads can enter twenty threads but cannot enter. Or make appropriate adjustments according to the required thickness of the sheet metal to be cut.
18. When the shearing machine blade edge is sharp, if there are burrs on the edge of the cut sheet, the gap between the upper and lower blades can be appropriately reduced.
1. Check the weld strength: Use a green silicon carbide grinding wheel to grind the back of a cutting tool and check the thickness of the solder layer. The thickness should be less than 0.15 millimeters. There should be no pores or insufficient solder at the bottom of the tool tip support surface, and the weld seam with insufficient solder filling 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 blade slot: If the blade is misaligned or droops beyond the technical requirements, it should be re-welded. Shearing machine blade。
3. Check the welding strength: Use a wooden hammer or copper hammer to strike the blade with moderate force, or strike the blade rod with a hammer with strong force. The blade should not fall out of the blade slot as a qualified product. Check the welding strength of the blade, it is not necessary to check each one individually, and a random inspection method can be adopted.
4. Check the flatness of the blade: If there are obvious pits on the blade, it indicates that the blade has overheated and deformed. The blade should be removed and a new one should be welded.
5. Check the cracks: After cleaning the blade with kerosene, if the shearing machine blade has cracks, kerosene will penetrate into the cracks and appear black lines, which can be observed with the naked eye. Or use a 10-40 times magnifying glass for observation. Check the cracks of the blade, you can also use the color flaw detection method: Mix 65% kerosene, 30% transformer oil and 5% turpentine to form a solution, add a little safran. Place the blade part of the cutting tool in this solution for 10-15 minutes, then wash it with clean water, apply a layer of white clay (kaolin), and dry it. Observe the surface after baking. If there are cracks on the blade, the color of the solution will show on the white clay with the naked eye. Cracked blades cannot be used and need to be re-welded.
1. Remove the lower blade, clean each one separately.
2. The blade can be used on all four sides. Select the good side and install it firmly. Check the straightness in both the horizontal and vertical directions.
3. Remove the upper blade, clean each one separately. The same as above, the blade can be used on all four sides. Select the good side and install it firmly. Check the straightness in both the horizontal and vertical directions.
4. The upper blade is fixed and cannot be adjusted. We adjust the gap of the shearing machine blade by adjusting the lower blade.
5. Find the two left and right adjusting screws for widening the gap of the lower blade, they are usually at the outermost side. 6. Find the two tightening screws for advancing the lower blade and narrowing the gap, there is a locking locking nut on the top. Usually on the inner side.
7. Loosen the four bolts on the lower blade platform.
8. Manually rotate the upper blade to the appropriate position. The operator goes to the blanking area of the shearing machine to start the adjustment.
9. Use a feeler gauge to start coarse adjustment from the position where the upper and lower blades do not bite each other to 0.5 millimeters.
10. Manually rotate the upper blade to the middle position and start coarse adjustment to 0.5 millimeters.
11. Manually rotate the upper blade to the position where the upper and lower blades are not separated and the right side is not lifted, and start coarse adjustment to 0.5 millimeters.
12. Manually rotate the upper blade to the appropriate position and start fine adjustment.
13. Start fine adjustment from the position where the upper and lower blades do not bite each other with a feeler gauge to the point where three threads can enter five threads but cannot enter.
14. Start fine adjustment from the middle position of the upper blade to the position where the upper and lower blades are not separated and the right side is not lifted, and start fine adjustment to the point where three threads can enter five threads but cannot enter.
15. Start fine adjustment from the position where the upper and lower blades are not separated and the right side is not lifted to the middle position of the upper blade, and start fine adjustment to the point where three threads can enter five threads but cannot enter.
16. For new blades, fine adjustment is to the point where three threads can enter five threads but cannot enter.
17. For old blades, fine adjustment is to the point where ten threads can enter twenty threads but cannot enter. Or make appropriate adjustments according to the required thickness of the sheet metal to be cut.
18. When the shearing machine blade edge is sharp, if there are burrs on the edge of the cut sheet, the gap between the upper and lower blades can be appropriately reduced.
