The occurrence and overcoming of five-layer flat-rolled defective products in steel drums (2)

The occurrence and overcoming of five-layer flat-rolled defective products in steel drums (2)

Third, the barrel side eversion (Figure 3)
The barrel body is everted, and it is also called the iron tongue. Vertical sealers or horizontal sealers are likely to occur, and the causes and solutions are as follows:
1. The barrel is flipped and bumped.
The semi-finished products of galvanized barrels are generally galvanized by the external unit. Due to the multiple handling of the barrel, some barrels are bumped and deformed. Because of the assembly, this changed the first part without using a wooden hammer to level, resulting in the problem of the eversion of the barrel after sealing. Only by taking effective measures to prevent bumps on the side of the barrel is the fundamental way to solve the problem.
2. The roller (bearing) installation is too high.
When operating the horizontal sealing machine, sometimes the length of the iron tongue is more than 10 cm, and it occurs intermittently. At this time, it should be judged that the supporting roller (bearing) supporting the bottom cover side is installed too high. Since the feeding position is too much beyond the bottom plane of the sealing disc, after the barrel is clamped, although the winding sealing wheel has not yet acted, the barrel side has been bent and lifted, and the iron tongue is sealed after sealing. At this point, the roller should be adjusted backwards, and after the appropriate amount, the problem of the iron tongue disappears.
4. The bottom edge or the cover edge is everted (Figure 4).
When the bottom cover of the bucket and the body of the barrel are sealed, there is a small section that cannot be hooked on the flange of the barrel, and is exposed outside the curling edge, also called the iron tongue. The causes and solutions are as follows:
1. Bump on the bottom cover.
This problem occurs when the bottom cover edge is picked up by bumping before it is assembled, and the deformation part is not flattened with a wooden hammer during assembly. Effective measures should be taken to prevent bumping the edge of the bottom cover.
2. Excessive welding of molten iron after cracking the barrel.
After the barrel is sewn by the welder, cracking sometimes occurs at the flanges at both ends. When repairing, if it is too much with molten iron, it will become thicker. An overly thick cuff will be squeezed outward from the cover when the seal is closed, so that a tongue is formed at the intersection of the straight seam and the loop. In order to prevent the appearance of iron tongue, make up as little iron as possible during repair welding, and smooth the thick part with a hand grinding wheel.

Five, iron tongue and shaving (Figure 5)
The iron tongue and the shaving phenomenon sometimes occur at the same time, and sometimes it can be single, but it is different from the third and fourth tongues mentioned above, and the latter is a full circle of tongue and shaving. The reasons for the problem and the ways to overcome it are as follows:
1. Use the wrong roll to seal the wheel.
This problem occurs mostly in steel drum assembly workshops with many varieties and specifications. For example, the steel drum material used is 1.0 mm thick, and if the coiled roller is 0.8 mm thick, the problem occurs when the winding roller is fed to a certain extent. The reason is that the rounding of the arc is under the curling edge, so it is necessary to eliminate the use of the coiling wheel and the marking and storage of the sealing wheel.
2. The arc of the sealing wheel is not suitable.
When the wheel arc design is not good, the broken fire is improper, and the roller is not in conformity with the model after machining, the wire cutting phenomenon is easy to occur. Overcome method: When the wire is severe, the new wheel should be replaced. When it is slight, you can loosen the buckle of the roller lock nut to make the wheel have a certain amount of swing. When the wheel arc wears together, the problem disappears naturally.
3. The flattening wheel is improperly adjusted.
The grooved flattening wheel used for sealing can produce a full circle of iron tongue when the wheel alignment is lower than the bottom plane of the sealing disk. At this time, the wheel should be adjusted upwards and the tongue can disappear after a full circle.