Fifth, barrel body flange process problems
The barrel flange is the most important process affecting the quality of the roll seal. First of all, it is necessary to determine the process requirements and technical standards for the flanging. If the technological requirements and technical standards are not scientific, it is impossible to make the correct product.
The process quality problems that often occur in the flanging process are the oversize of the flanging, the overshoot of the flanging angle, uneven flanging, mechanical damage, flanging, and the like.
1, oversize flange size
The size of the flanging is poor, and the width is not enough to meet the required size. The impact on the hemming process is obvious. Due to the lack of hemming materials, it is certainly difficult to achieve the desired number of layers, and voids are also formed in the hems. leak.
Excessive flanging is less common, but if this happens, the impact on the quality of the curl is greater because the edge of the flanging may be too wide beyond the pre-roll edge of the bottom lid during crimping. If it cannot be pre-crimped and contained, the self-scrolling phenomenon of the bottom lid will occur during the process of sealing. This is one of the often-known conditions of false-rolling. The result is that the bottom of the finished barrel is easily detached from the barrel. This is the most serious quality problem for steel drums. It is absolutely impossible!
2, overturned edge angle
The most important thing in the flanging process is the flanging angle. Most people think that flanging at 90° is the most ideal. In fact, this is really just an ideal, but in practice, forming a bell-shaped flange is the best for the quality assurance of the crimping process. In general, the angle between the flange and the barrel is 105°~110°. The reason why this is the case is mainly due to the following reasons.
The included angle of 90° is often deformed due to bump during the process rotation, making the angle of some parts less than 90°. During the crimping process, the edge of the flange cannot be tightly combined with the bottom edge of the barrel, which is prone to false-mass quality. Problem; Even in the absence of bump deformation, in the crimping seal, due to the pressure of the clamping discs on both sides, the reverse side of the 90° flange is often tilted to form an angle of less than 90°, resulting in a full circle of falsehood. Volume phenomenon. However, when the angle greater than 90° is not easily deformed during bumping, it can be tightly combined with the bottom edge of the barrel under the effect of the sealing platen, so that a more reliable envelope can be achieved and the false-folding phenomenon is less likely to occur.
3, uneven flanging
In the production practice, unfair flanging is also more common, mainly in the width of the barrel flanks throughout the week, some parts are wide, some parts are narrow, if the wide part is higher than the bottom edge of the barrel , there will be false roll phenomenon; if the narrow part can not meet the requirements of the process standards, there may be curling gaps. Both of these conditions can cause serious leakage.
4, mechanical damage at the edge
Mechanical damage is generated during the turnaround of the process, and is not likely to occur in a production environment where the workpiece does not fall on the automatic production line. Different degrees of damage can cause different effects on the roll closure, and those with a large degree of damage can cause false roll, iron tongue and other quality problems.
5, cracking at the edge
There are two cases of flanging phenomenon, one is due to the effect of hardening and embrittlement of the material, and transverse cracking occurs when the flanging occurs; the other is that sometimes the flanging width is severely widened, and when the welding is not secure or scorched, it will appear longitudinally. crack. Both of these flanging phenomena leak during crimping.
Sixth, barrel swelling process problems
Barrel bulging will not have too many quality problems under normal circumstances, and sometimes errors in dimensions will not affect the actual quality, but in some cases, more serious problems may occur.
1, expansion type crack
When the material is brittle and hard and the seam welding is charred, the expansion process will crack at the apex of the bulge, resulting in leakage. Sometimes it is also possible that when stirrups are swelled, stirrups are too high and they are distorted and cracked. The crack will directly lead to leakage at the crack.
2, weld tear
In the case of welding with false welds, the welding process may tear the welds apart, stretching the ribs. The tearing of the weld can only be treated as waste, and the stretched ribs can be repaired by over-welding as rework products.
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