Shears are used to cut slabs with straight edges. Moving upper blades and fixed lower blades are used to apply shear force to metal plates of different thickness with appropriate blade spacing to separate the plates into required sizes.
The blades of shears are widely used in light industry, aviation, shipbuilding, metallurgy, instrumentation, electrical, stainless steel products, steel structure construction and decoration industries. Made of T10, 9CrSi, 6CrW2Si, Cr12MoV, H13 and other high-quality alloy tool steels, the blade is sharp.
Distinguish the quality of scissors blade
1. the first thing to look at is the price of scissors blades. With the same material and processing technology, the price of scissors blades is similar. Customers can first understand the mayor / market price of raw materials used to produce shear blades, and then compare the prices of shear blade manufacturers. If the quotation is lower than or slightly higher than the material price, it is a secondary charge.
2. production process: except for materials, it is the processing process of the production process. In the production of scissors blade, each process is very important. The priority is heat treatment. Qualified scissors blade group should be soaked at least twice to achieve the effect of consistent hardness inside and outside, non brittle blade and durable wear resistance. (David Asher, North Executive).
In order to reduce the cost, some manufacturers of plate shears have reduced the number of quenching and even ignited them with clay. If customers are not willing to buy these scissors blades, they should first compare the prices. Second, after purchase, the metal hardness tester is attached to the body and tested in many places to ensure that the hardness is observed and matched.
3. accuracy: the parallelism of ordinary shears' blades is 0.03mm, and the thickness of the blade's full length cannot exceed 0.03mm. Only when this accuracy is obtained can it be considered as a suitable shears' blade. Measurement tools can be used after purchase. First, compare the errors on both sides of a single blade, and then measure whether the accuracy of the whole blade is consistent one by one, and then check whether there is any gap in the joint. Touching it with your hand will give you a feeling of unevenness.
4. Quality assurance: a set of high-quality and qualified scissors blades can be used for 1 ~ 2 years less and 3 ~ 5 years more under normal use. Therefore, the after-sales guarantee must be inquired and an agreement must be signed at the time of purchase. The blade manufacturer of the plate shears promises to the users that if quality problems occur within a certain period of time, they can be replaced unconditionally. (David Asher, northern exposure (American TV Series), quality) if there is no such commitment, the quality of the blade is difficult to be guaranteed.
Scissors blade clearance adjustment
1. remove the blades and clean them one by one.
2. the blade can be used around. Select the good side and install it. Check the levelness of the blade in both horizontal and vertical directions.
Remove the upper blades and clean them one by one. Similarly, the blade can be used around. Select the good side and install it. Check the levelness of the blade in both horizontal and vertical directions. 4. the upper blade is fixed and cannot be adjusted. Adjust the lower blade and the blade spacing of the scissors.
5. find the left and right large clearance screws of the lower blade, which are usually at the outermost. 6. slide the left and right lower blades of the lower blade to find the fastening screw to reduce the gap. There is a lock nut on it. Usually inside.
Loosen the four left and right bolts on the blade table.
8. manually select the car to lower the saw blade to the appropriate position, and the workers go to the falling area of the shear to start adjustment.
9. use a ruler to start from the part on the left hand where the blade does not match, and then bold it to 0.5mm.
10. move the blade to the middle position with the manual linear car, and roughly adjust it to 0.5mm.
11. move the blade to the middle of the position where the right upper and lower knives do not fall off, and roughly adjust it to 0.5mm.
12. manually select the car and lower the saw blade to the appropriate position to start precise adjustment.
13. use fine porcelain, adjust the position where the upper and lower knives of the left hand do not coincide to three characters, and do not enter room 5.
14. move the blade to the middle position with the manual linear car, and accurately adjust it to 3 rotors without entering 5 balls. (Albert Einstein, Beijing, Shanghai, Guangzhou and Shenzhen).
15. move the blade to the position where the upper and lower right knives are not disengaged by the manual linear car, and start to adjust accurately, so that three sons can enter five companies. (Windows)。
16. the upper part is adjusted to be cleaned by Division 3 in order to adapt to the new car. It is not allowed to enter room 5.
17. if you use a used car, you can't enter 20 rooms with 10 cleanings. Or, make corresponding adjustment according to 1/10-1/20 of the thickness of the sheet metal to be cut.
18. when the blade of the plate shears is sharp, if there are burrs on the edges of the cut plates, the gap between the upper and lower blades can be appropriately reduced.
Maintenance of scissors
1. Operate in strict accordance with the operating regulations.
2. Before each power on, add lubricating oil at fixed time, fixed point and fixed quantity according to the lubrication chart. The oil must be clean without sedimentation.
3. The machine tool should always be kept clean, and the unpainted parts should be kept free of rust.
4. the lubricating oil in the motor bearing shall be regularly replaced and charged, and the electrical parts shall be regularly checked for normal and safe operation.
5. Regularly check whether the V-belt, handle, handle and button are damaged. If they are seriously worn, they should be replaced immediately and reported to the spare parts for replenishment.
6. Regularly ensure the reliability of maintenance switch, fuse, handle and operation.
7. wipe, lubricate and clean the machine tool 10 minutes before work every day.
8. it is strictly forbidden to operate the equipment without designated personnel. At ordinary times, someone must leave the machine to stop.