Setting of the flange width of the open neck steel barrel

Setting of the flange width of the open neck steel barrel

Fu Erquan

In order to save space in the container and facilitate stacking, many manufacturers are producing open necked steel drums. Some manufacturers asked me about the shrinking machine, for which we designed the "vertical flanger". During the design process, I found that determining the width of the neck is a very complicated calculation. It is affected by many factors such as barrel diameter, coil diameter, and material thickness. I will recommend my analysis, calculation and derivation results to everyone, discuss them together, and apply them easily to avoid complicated calculations every time. First, the calculation formulas for several common rotating body areas are listed. See Table 1.

Table 1 Formula for calculating the area of ​​common rotating body

1. Deriving the relationship between the width of the flanging and the diameter of the barrel, the diameter of the coiled tubing and the thickness of the material

figure 1

Referring to Figure 1, the various symbols have the following meanings:

D1——neck barrel neck inner diameter

B——Necked end flange width

D——the outer diameter of the barrel at the flange

D——roller diameter

a - after the coiling. An angle that is thick and cannot be fully closed

F——minus the side width B minus the radius of the coiled tube and the outer diameter of the circle of d.

F1 - the area of ​​the 1/4 convex ball ring after the coil:

F2 - the area of ​​the ball circle of the unclosed section minus the semicircular section ring of the coiled tube.

F3——The area of ​​the ball ring of the semicircular section ring that is completely closed after the coil is assumed to be c

In the process of widening the round neck into a round tube, the thickness of the material has changed, but its influence is not sufficient, and the sound is not considered here. Therefore, the following relationship is available:

F = F1 + F2 = F1 + kF3... (1)

among them:

According to Table 1 and Figure 1, there are:

Therefore, the above items are substituted into (1), and the relationship is as follows:

After actual calculation and analysis, it is found that the second item 2(D–t)2 under this root number is much smaller than the other two items, so it is omitted and the error is within a few minutes. This gives the calculation formula for the side width:

It can be seen from this formula that the width of the flange is related to the barrel diameter d1, the diameter of the coil tube D, and the material thickness t:

Second, the analysis of the relationship between the flange width B and the barrel diameter d1, the diameter of the coil tube D and the thickness t

It seems a bit cumbersome to analyze directly from (4), and the conclusion is not intuitive, so we first get an intuitive understanding from the graphical man, see Figure 2. According to GB325 "Packing Container Steel Barrel", the diameter of the coiled tube is φ8 and φ6. Figure 2 compares the two. According to the conventional material selection, the material thickness is considered to be 0.4~1.5mm.

It can be seen from equation (4) or Fig. 2 that when the diameter D of the coiled tube is the same, the thickness of the material increases, and the width of the side decreases. When the thickness of the coil is the same, the larger the diameter D, the larger the width of the side: then the width of the side and the barrel What is the relationship between the trails? This has to be analyzed from the calculation: from the comparison of several barrels in GB325, the following D, d1 and B, â–³ B and other units are mm, the calculation is correct for the convenience of not writing units.

figure 2

The other material thickness, pipe diameter and barrel diameter are substituted into the calculation, and the results are the same, which is not mentioned here. The conclusion is: when the material thickness is the same, the diameter of the coil tube increases, the side width increases, and the tube diameter D is the same, the side width is the same, and is basically not affected by the barrel diameter d1. For example: for the standard 100L barrel d1=400, when the material thickness is t=1.0 and D=8, the side width is 15.5, when the other non-standard barrel d1=425 is changed, as long as the material thickness is constant, D is not Change, the edge width is still 15.5, no need to recalculate. Then how much increase in thickness t and diameter D has an effect on the width of the side? Their general trend has been analyzed in Figure 2. Now it is necessary to find out the specific quantitative relationship, which is not known from the figure and needs to be found out from the calculation. In combination with the above: t, D are the same, then B is the same conclusion. In the GB325 standard, several d1 buckets are respectively found to represent the B values ​​when t and D are the same, and the following data is obtained according to formula (4):

First look at the effect of D when t is the same. For every 1 mm increase in D:

The result is: for every 1 mm increase in D, the side width is increased by 2.4 mm. Then, when D is the same, what about t? See the calculation below:

The result is: when D is the same, the edge width is reduced by 3 mm for every 1 mm increase in t. Therefore, the conclusion of the relationship between the flange width and the barrel diameter d1, the coil diameter D and the material thickness t is:

When the material thickness t and the pipe diameter D are the same, the side width should be the same, and it is basically not affected by the barrel diameter d1.

4毫米。 When the thickness of the tube is increased by a distance of about 2. 4mm.

When the diameter of the three coils is the same, the width of the material should be reduced by 3 mm for each 1 mm increase in the thickness of the material.

On the alliance, we can get a simple formula for calculating the width of the side:

B= 11+2.4(D -6)+3(1 –t)...... (5)

Third, calculate the width of the flanging and derive the meaning of the above conclusions

With the market demand, manufacturers of shrinking barrels often face changes in steel drum specifications and are a variety of non-standard barrel types. Therefore, the production process must always be referred to as the whole equipment. As shown in Figure 3. In our design, the "vertical flanger and necking machine" adopts the form of a shrinking wheel along the die wheel groove. B directly affects H, h (the relationship is not derived here), that is to say, when there is a change in t and D for each type of barrel, it is necessary to adjust the cut point of the neck of the neck, that is, the H value. At the same time, we must also know the change of (Hh), that is, the amount of barrel shortening, so that the lower tray can follow up in time. If we are producing t=l, D=6, B=11.0 barrels, and immediately change production t=0.4, D=8 barrels, then what is B? It can be done with mental arithmetic. First, suppose t is constant ΔD=8-6=2, according to the above conclusion 2x2.4=4.8, then 11+4.8=15.8; then D=8 is unchanged, t becomes 0.4, 1-0.4 = 0.6, 0.6 X3=1.8, 15.8, and 101.8=17. 6. It is easy to calculate the B value, and then adjust the equipment according to the relationship between B and H, h. It can also be directly substituted into the formula (5), B = 11 ten 2.4 (8-6) ten 3 (1-0.4) = 17.6. Therefore, the above series of derivations are carried out with the aim of providing a simple and quick method for design and production, avoiding complicated calculations each time (some features are also applicable to straight-open barrels). These conclusions may be of great help to the manufacturers of shrinking barrels and straight openings for your reference.

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