Analysis of materials and process problems affecting the quality of steel drums (5)

Analysis of materials and process problems affecting the quality of steel drums (5)

Eight, barrel bottom cover forming and pre-rolling process problems
The quality problems that often occur in the production process of the bottom cover of the barrel are: tensile cracking, punching and cracking, deep or wide side width, looseness of the barrel mouth, pre-crimping, and uneven injection.
1, tensile cracking
Stretching cracks generally appear on the bottom edge of the bottom of the bottom of the bucket. There are three reasons for this: first, poor tensile properties, low plasticity, high hardness, and high brittleness. Second, errors or gaps occur after the tensile mold wears. Inequality; the third is that the material is too thick, resulting in a relatively small gap in the mold.
Stretched and cracked workpieces are not repairable and can only be treated as waste. However, in actual production, such workpieces often do not appear in batches. Mass production is sometimes difficult to find. Once the subsequent winding process is completed, the finished product is formed. The waste will increase the loss. Therefore, in this process, a serious fixed-point inspection is generally required.
2, punching and cracking
Flange cracking often occurs when punching and burring for the barrel mouth lock. Most of this is caused by mold problems, and partly because of the brittleness of raw materials. The punching and cracking of the punching holes has hidden hidden dangers in the process of locking the next barrel mouthpiece, and there may be a quality problem of leakage at the mouth of the barrel.
3, the bottom depth and side width are out of tolerance
In the process of the bottom cover type, sometimes the bottom depth and the side width are out of tolerance. In most cases, the two cases occur at the same time, because the blanking size has been determined before molding, if the depth of the cover is insufficient after the molding process , the side width must be extra wide; if the cover depth exceeds the process requirements, the edge of the lid will become narrower.
When the width of the side is too wide, the curling part in the pre-roll may be excessively wound or the width of the pre-rolling is too wide. When the sealing is assembled, the bottom cover is easy to self-wind, so that the body is poorly contained, resulting in a false seven. The curling of the layer.
If the side width is too narrow, there may be a defect that the pre-rolling is not in place or the width of the pre-rolling is insufficient. When the sealing is assembled, the edge of the bottom cover cannot accommodate the flange of the barrel, and a false roll phenomenon occurs.
4, the wire loop is too loose
When the barrel ring is pressed, sometimes it is too loose. This is because the mold is not pressed or the mold is worn out. Generally, it can be solved by adjusting the press or repairing the mold. If the compression is too loose, leakage will occur at the mouth of the barrel, and it cannot be repaired after the sealing is assembled, so it is necessary to carry out frequent and detailed inspection.
5, the bottom cover pre-heming tolerance
The pre-rolling of the bottom cover of the bucket sometimes causes an out-of-tolerance phenomenon. No matter what kind of error occurs in the crimping part, it will produce a bad curling effect in the sealing assembly. Many kinds of curling defects are generated, so it cannot be ignored.
6, pre-rolling glue problem
Generally, the glue is injected at the same time in the pre-crimping process, and the glue is injected to add a flexible adhesive filler to the crimp seal to facilitate the crimp sealing. The general process requires that the injection should be uniform and sufficient. If it is not reached, it will definitely affect the sealing performance of the crimp.
In addition, in actual production, some enterprises often carry out the next sealing and crimping process without pre-filling glue, which is equivalent to burying a serious leakage hazard, because when the wet film is sealed into the seal, The internal glue is in a sealed container that is relatively isolated from air, and it is difficult to cure. When the steel drum is slightly bumped during use, the sealant will lose its sealing effect and cause leakage. We used to drop the finished steel drum that had been placed for one year, and found that there was still white liquid glue out of the leak. The reason is here.
The above systematic analysis of the main process problems affecting the quality of steel drums, from which we can find that each process quality problem is related to each other, mutual constraints, and mutual influence. Therefore, in order to make the final steel drum products fully qualified and stable in quality, it is necessary to conduct detailed research and control on the interrelationship between processes. This is not easy to achieve in traditional quality management, but fortunately, ISO9000 The quality assurance system provides us with a scientific working platform to ensure the quality of the steel drum is truly guaranteed. With the ISO9000 quality assurance system, we scientifically control the steel drums from procurement, design, production and sales, so as to straighten out the relationship between each link and each process, and drive the management of the whole enterprise to be standardized, scientific and modernized. Therefore, it is possible to realize an efficient, conscious and rigorous management system of the enterprise, and achieving low cost and high efficiency is not a dream.

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