Analysis of materials and process problems affecting the quality of steel drums (3)
Five, the barrel body flanging process problem
The barrel flange is the most important process affecting the quality of the package. First, it is necessary to determine the process requirements and technical standards for the flange. If the process requirements and technical standards are unscientific, it is impossible to make the right product.
The process quality problems often encountered in the flanging process are the oversize of the flanging, the overturning angle, the uneven flanging, mechanical damage, flanging cracks, and the like.
1, the flange size is out of tolerance
The flanging size is too poor, and the width is not up to the required size. The influence on the crimping process is obvious. Due to the insufficient material of the crimping material, it is difficult to achieve the desired number of layers, and voids are formed in the bead, thereby causing seepage. leak.
There are fewer cases where the flange is too wide, but if this happens, the effect on the quality of the seam is greater, because at the edge of the flange, the edge of the flange may be too wide beyond the pre-roll edge of the bottom lid of the bucket. Can not be included in the pre-rolling, the barrel bottom cover self-winding phenomenon during the winding process, which is one of the often mentioned false roll cases, the result is often that the bottom of the finished barrel is easily separated from the barrel This is the most serious quality problem of steel drums, it is absolutely impossible to appear!
2, the angle of the flange is too bad
The most important aspect of the flanging process is the angle of the flanging. The average person thinks that the flanging 90° is the most ideal. In fact, this is really only an ideal, but in practice, the formation of the bell-shaped cuffs is the best for the quality assurance of the crimping process. Generally speaking, it is more suitable for the angle between the flange and the barrel body to be 105°~110°. The reason for this is mainly because of the following reasons.
The angle of 90° is often deformed by bumping during the process turnover, so that the angle of some parts is less than 90°. During the sealing process, the edge of the flange cannot be tightly combined with the bottom edge of the barrel, which is prone to false roll quality. Problem; even in the case of no bump deformation, in the crimping seal, due to the pressure of the clamping discs on both sides, the 90° cuff side is often tilted up to form an angle of less than 90°, thus forming a full circle of false Volume phenomenon. However, the angle greater than 90° is not easily damaged and deformed in the collision, and can be tightly combined with the bottom edge of the barrel under the action of the sealing platen, so that a more reliable sealing can be achieved, and the false roll phenomenon is less likely to occur.
3, uneven edge
In the production practice, the unevenness of the flanging is also more common. The main performance is that the width of the flange is different in the whole circumference of the barrel. Some parts are wide and some parts are narrow. If the width is higher than the bottom edge of the barrel. False roll phenomenon occurs; if the narrow part does not meet the requirements of the process standard, the curling gap may occur. Both of these conditions can cause serious leakage.
4. Mechanical damage at the flange
Mechanical damage is generated during the turnaround between processes, which is less likely to occur in production environments where the automatic production line does not land. Different degrees of damage can have different effects on the sealing, and the degree of damage can cause quality problems such as false rolls and iron tongues.
5, cracking at the flange
There are two kinds of phenomena of flange cracking. One is due to the hardening and embrittlement of the material, and the transverse crack occurs when the flange is flanged. One is that the width of the flange is sometimes too wide, the weld is not strong, or the burnt occurs. crack. Both of these flange cracking phenomena will leak when the seam is sealed.
Sixth, barrel body expansion process problems
In general, there is not much quality problem in the barrel expansion type. Sometimes there is an error in the size and it will not affect the actual quality, but in some cases, a more serious problem may occur.
1. Expansion crack
When the material is brittle and the seam is burnt, the expansion process will crack at the apex of the expansion rib, resulting in leakage. Sometimes the bulge may be super-high when it is inflated, and it may be excessively deformed and cracked. The generation of cracks will directly lead to leakage at the crack.
2, weld tear
In the case of false welding in the welding, the weld may be torn open during the expansion process, and the expansion bead may be stretched. The tearing of the weld can only be treated as waste, and the stretched rib can be repaired by repair welding as a repair product.
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