The latest trend in the production of triple-rolled steel drums

William Ljma

Russell-Stanley

The manufacture of triple-rolled steel drums is more stringent than that of double-rolled steel drums. When we produce a complete triple-rolled steel drum, we can provide users with excellent steel drums. If the processing technology of the steel drum is not good, the product that can only be provided to the user is inferior and crude.

When processing triple-rolled steel drums, the problems we encountered were far less problematic than the problems encountered in the production of double-rolled edges. This requires us to focus on the actual production process and carefully formulate the processing technology.

I will discuss the current trends in this process. The entire process begins with the manufacture of the bottom of the bucket and the lid of the bucket, ending with the actual crimping.

The manufacture of the bottom of the bucket, the cover or some other parts is done by a stamping process. This process has remained unchanged for many years. In recent years, various manufacturers have focused on the stability of stamping dimensions. At present, people are very concerned about the depth of the barrel and the depth of the cover, the length of the French blue side and its external dimensions. The tolerances for these dimensions are critical. The latest development in the processing of the bottom of the bucket and the lid is to form a small pre-rolled circle or a shape change of the edge of the blue edge when the bottom of the bucket is pressed. In this way, the life of the triple-headed roller is increased by a factor of six.

The triple beading can be either one of a direct crimping or a pre-rolling round. There have been two different factions about this issue for many years. The trend in the past is to pre-roll the circle first, then use several pressure rollers to crimp the edges, and finally form a triple crimp. This necessitates better control of the shape and dimensional stability of the bottom of the bucket, the pre-rolled circle of the cover. The bottom of the barrel and the pre-rolling of the cover and then curling will greatly improve the quality of the curl. Our experience shows that the shape and size of the pre-rolled circle is one of the most important factors in the production of triple crimping.

In addition, for the manufacture of the triple bead, attention should also be paid to the stability of the size of the barrel. Here are three main aspects of controlling the barrel edge:

1. The angle at which the edge is perpendicular to the barrel;

2. Edge width

3. The radius between the edge and the barrel.

There are two current trimming processes: one is the pressure roller edge: the other is the extrusion edge. The squeezing edge is completed by the guide sleeve, the hydraulic cylinder and the assembled extrusion edging die. The purpose of both processes is to provide an extremely matching edge for the crimping process.

Then let's talk about the crimping process. I think that in recent years, a lot of improvement work has been done in this respect. Here are some new concepts:

1. Single-ended crimping;

2. Two crimping pressure rollers and inspection measuring rings can be identified;

3. Two-step curling;

4. Mechanical and hydraulic combined drive driven crimping wheel;

5. Proportional hydraulic tracking;

6. Digitally set by computer;

We will briefly discuss the above and the benefits they bring to the hemming process.

1. Single-ended crimping - can only complete the three-end crimping of the bucket at a time. It has the advantage of better control of the working feed of the crimping machine and does not favor the end but ignores the other end, as in the case of double crimping.

2. Two crimping rollers can be calibrated and the measuring ring can be inspected - the measuring ring and the two crimping rollers are designed on a sliding carriage with a contour that exactly matches the required shape of the bead. This can greatly reduce the iron tongue formed by the curling over the head. It is well known that the iron tongue at the beading will cause partial damage to the steel drum.

3. Two-step crimping - the first and second processing is done through two separate crimping operations. Pre-crimping is not required during this process. This allows for better control of the completion of the hemming process and allows the operator to take advantage of the above-mentioned two-way crimping wheel with alignment. Another advantage of this method is that when the measuring ring is inspected for each revolution, the amount of curl formation is small and the quality of the curl obtained is good.

4. Mechanically and hydraulically coupled to the driven crimping wheel - which forms the bead, the roller assembly is essentially free of the single cam structure of the past, and a hydraulic cushion is placed into the crimping forming wheel assembly. It will be beneficial to compensate for the thickness error of the steel plate.

5. Proportional Hydraulic Tracking - Used to control the movement of the crimping roller during the crimping process. Proportional hydraulics start working at a lower pressure and then continue to increase pressure as the crimping process progresses. This allows for better control of the initial machining and guarantees a complete seven-layer crimp.

6. Digitally set by computer processing - providing more accurate repeat positioning without operator intervention.

I have talked about the current trends in the development of triple curls that I understand. Before I finish my speech, I want to talk about some other issues.

The key to these problems mentioned above is the ability to obtain high quality steel sheets. Some manufacturers can purchase high-quality steel plates, and some manufacturers cannot. The raw material has a great influence on the final curling. It is of utmost importance that the thickness of the coil is consistent from beginning to end. In addition, the hardness and formability of the steel sheet must be constant from start to finish. I know that some manufacturers have installed extremely accurate thickness monitors on their coil processing equipment and monitored their thickness during coil processing. I don't know if there is any way to monitor the formability of the coil over its entire length. All of our steel drum manufacturers must unite and publicize to our steel suppliers. The quality of steel materials has a very important impact on the quality of our products. We cannot accept low-quality raw materials from them for a long time.

As an international organization, we can do it toward a common goal. To a certain extent, we will make the world's steel companies believe that we will not be regarded as second-class steel users for a long time.

Before I finish my speech, let me sum up, that is, to consistently produce the ideal triple hemming, and I am not just referring to the curling edge. First, we should understand what causes the quality change in the production process. These factors must be analyzed one by one, eliminated in processing or greatly reduced the impact of these factors. This will be a process of continuous improvement and a never-ending process.

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