Design of the groove curve of the sealing wheel of steel barrel crimping machine

Design of the groove curve of the sealing wheel of steel barrel crimping machine

Shi Zhenzhuang City Barrel Factory Liu Zhenting

To ensure that the steel drum does not leak, there are many aspects involved. Whether it is double or triple crimping, sealing curling is a key process. The success or failure of this process depends on the design of the sealing wheel. 6 According to the production experience of our factory for many years, we will talk about the specific practice of designing the sealing wheel.

In the seal, the change of the barrel and the barrel curl is shown in Fig. 1. It can be seen from the figure that the groove shape of the sealing wheel is mainly required to have two points of gully curve. The radius of curvature of each point from A to B is gradually connected from large to small. The purpose of this requirement is to force the sheet to be straight and to be rolled up like a clockwork. There are many curves that meet these two requirements, such as the Archimedes spiral, the logarithmic spiral, and the involute of the circle. Selecting these curves as the groove curve of the sealing wheel can achieve satisfactory results. Let's take the circular involute as an example to talk about the design process of the sealing wheel.

Figure 1 Schematic diagram of the barrel and the bottom of the barrel

1-barrel; 2-barrel bottom; sealing wheel

1. Draw a circle involute. It is inconvenient to plot the involute parameter equation. ...It is more convenient to make the drawing according to the involute rhyme definition, as shown in Figure 2.

1 Draw a base circle with rj as the radius, and divide the circumference into 18 parts, each arc length is 2πrj/18≈0.35rj.

2 Using the points on the circumference as the tangent point, make 18 tangent lines in the same direction, and make the length of each tangent line:

No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Tangent length 0 0.35rj 0.7rj 1.05rj 1.4rj 1.75rj 2.1rj 2.45rj 2.8rj 3.15rj 3.5rj 3.85rj 4.2rj 4.55rj 4.9 Rj 5.25rj 5.6rj 6.95rj 6.3rj

8 smoothly connecting the end points of each tangent, that is, an involute of the base circle whose radius is rj is obtained.

Figure 2 Circular involute diagram

2. When the involute is sandwiched between two sets of parallels in any direction, and the two parallel lines are tangent to the involute, the segmented curve can be used as the groove of the sealing wheel curling work belt. use.

image 3

3. Estimate the width B and depth H of the groove of the sealing wheel (Fig. 3). According to the principle that the bottom of the barrel is involved in the partial deformation of the curling before and after the deformation, a simple estimation is made:

(a+b)×(δ+c)=πd2/4

Where: a- barrel width of the barrel; b-width of the flange side of the bottom of the barrel; δ - material thickness; c thickness of a seam; d - diameter of the round curl.

The two ends of the equal sign represent the cross-sectional area o before and after the curling deformation. (Of course, the actual deformation is much more complicated than this.)

d is the theoretical width and depth of the slotting of the sealing wheel. therefore,

d=2√(a+b)×(δ+c)/π

The role of the head wheel is mainly to form the hemming. The groove width B is generally 0.9d, the groove depth H is 0.8d, and the base circle radius rj is 0.15d.

The main functions of the two wheels: one is to further compact the bead, and the other is to determine the shape of the bead to ensure the appearance of the product. Generally, the groove width B is 1.1d. The groove depth H is taken as 0.6d. The groove shape is customized according to the appearance requirements.

Finally, in order to ensure that the sealing wheel starts to enter the wheel, the curling part of the bottom of the barrel smoothly enters the wheel groove, and the 2×45° chamfer at the entrance of the wheel groove cannot be ignored in the design and manufacture.

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