JPH0220331B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Object of the Invention [Field of Industrial Application] The present invention relates to a beading device used for beading a can body.

[Prior Art] In recent years, can body metal materials used for food can containers have become thinner (gauge down), and at the same time, in order to strengthen can strength, can body 2 of can 1 has been The number of bead 3 inserts is increasing. For example, recently, two-piece cans with thinner can bodies (ironed cans) or TFS (tain-free steel) are being used.
Adhesive cans are widely used and traded as so-called internal pressure cans for beverage cans filled with carbon dioxide gas, etc., but by inserting beads into the can body of these cans, they can be used as external pressure cans to create negative pressure inside fruit juice beverage cans, etc. , we are moving toward producing containers with thinner plate thickness and stronger cans.

On the other hand, the can body is subjected to an axial force, which is the force that acts when the lid is tightened and the external pressure after the actual can, and a circumferential force, which is the external pressure after the actual can, and these are applied to the can itself. The buckling strength and paneling strength of the However, this buckling strength and paneling strength are contradictory; in order to increase the paneling strength, the number of beads can be increased and the bead depth can be increased, but the buckling strength will decrease.
Therefore, the number of beads, bead depth, and shape have been studied in order to match the buckling strength and paneling strength for various can types.In the end, in order to obtain stable buckling strength and paneling strength, It is necessary that the bead shape and depth be uniform, and it has become clear that partial changes in shape tend to cause stress to concentrate in that part, leading to instability in strength. For example, in a coffee beverage can (202 x 504, TFS0.17 material, 15 beads), by changing the bead depth by 0.1mm, the paneling strength will be 0.5Kg/cm ² and the buckling load will be 80
Kg changes.

[Problems to be solved by the invention] However, when processing such beads into a can body, whether it is an inner bead or an outer bead, a rolling method is usually adopted, and the tools used therein are mainly They are a beading roll and a beading rail.

Beading rails are generally used fixedly, and are often arcuate in shape.
The beading roll is attached to a spindle and rotates forcibly, rotating the can body while beading. As shown in FIG. 6, the beading rail and beading roll can be combined in such a way that the beading roll 6 is attached to the spindle 5 from one side of the beading rail 4, and the beading roll 6 is attached to the can body 2.
The other end of the spindle 5 is fixed to the opposite side, and the bead processing is performed while rotating with both ends supported, and as shown in FIG. 7, the spindle 5a,
beading roll 6a attached to 5b,
6b is inserted into the can body 2 from both sides of the beading rail 4 and beaded while rotating while being supported on a cantilever, or as shown in Fig. 8, it is attached to the spindle 5 from one side of the beading rail 4. In some cases, a beading roll 6 is inserted into the can body 2', and the spindle 5 rotates while being supported on a cantilever to perform bead processing. , the forming process load is high, and most of the reaction force is applied to the beading roll side. Therefore, the diameter of the beading roll and the spindle to which the beading roll is attached must be made thicker to give it steel properties, but the thickness is restricted due to the condition that the beading roll is inserted inside the can. In reality, beading rolls and the like are deflected by the action of the forming load, and in areas where the amount of deflection is large, the can bodies 2, 2' are not sufficiently machined, and the depth of the bead becomes small. For example, in the case of the processing type shown in FIG. 7, as shown in FIG. 9, the depth of the bead 3 at the free end side of the beading rolls 6a, 6b (the center of the can body 2) is the same as that of the bead 3b at the base. This causes the bead shape to become non-uniform, which affects the buckling strength and paneling strength mentioned above, and causes the can to become unstable.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a bead processing device that can easily and reliably form uniform beads.

(B) Structure of the Invention [Means for Solving the Problem] In response to this object, the can body bead processing device of the present invention comprises a processing portion of a beading rail that is fixedly located outside the can body. A bead processing device configured such that a processing section of a beading roll rotatably located inside the can body is located opposite to and cooperates to form a bead on the can body, The beading roll is characterized in that a portion of the processed portion that is deflected by a larger amount of bending due to the forming processing load has a larger diameter.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In FIG. 1, 11 is a bead processing device for a three-piece can. The bead processing device 11 includes a beading rail 14, spindles 15a, 15b, a pair of beading rolls 16a, 16b, and can guides 17a, 17b. The beading rail 14 is shaped like a block with a flat plate or an arcuate cross section, and the inner surface thereof constitutes a processed portion 21 having a plurality of arcuate protrusions 18 and grooves 19.

A pair of beading rolls 16a, 16b are located inside the beading rail 14 coaxially facing each other, and their base ends are connected to spindles 15a, 1, respectively.
5b. Therefore, the beading rolls 16a and 16b are each attached to the spindle 1.
It protrudes like a cantilever from 5a and 15b, with the distal end serving as a free end and the proximal end serving as a fixed end. Of the beading rolls 16a and 16b, the outer periphery of the tip end side corresponding to the beading rail 14 in the axial direction constitutes a processed region 24 in which a plurality of protrusions 22 and grooves 23 are alternately formed. The ridges 22 of these beading rolls 16a, 16b
and the grooved line 23 is the grooved line 1 of the beading rail 14.
9 and the protrusion 18. A particularly important point to note here is that, as shown in FIG. 1 and emphasized in FIG. That is, the diameter of the portion that forms the free end of the cantilever beam and exhibits maximum deflection due to the action of a lateral load is the largest, and the diameter decreases as it approaches the proximal end. However, the shape of the processed portion 24 is not limited to a tapered shape, but may have a shape such that the ridgeline of the processed portion 24 corresponding to the beading rail 14 becomes straight after bending deformation when a lateral load is applied to the processed portion 24. You can also use it as Further, the bottom of the concave line 23 of the beading rolls 16a, 16b is the second
As shown in Figure A, each may coincide with the same virtual tapered surface, or as shown in Figure 2B, the bottom of each may be stepped.

[Function] In the bead processing apparatus configured as described above, when performing bead processing, the can body 2 is set inside the beading rail 14 using the can guides 17a and 17b as guides, as shown in FIG. By inserting the beading rolls 16a, 16b attached to the spindles 15a, 15b from both sides of the can body 2, and rotating the beading rolls 16a, 16b, the protrusions 18, grooves 19 and beading roll 16
The can body 2 undergoes bead forming between the concave lines 23 and convex lines 22 of a and 16b. beading roll 1
Since the processed portions 24 of the beading rolls 16a and 16b have a shape such as a tapered shape whose diameter increases toward the tip, the tips of the processed portions 24 of the beading rolls 16a and 16b are beaded before forming. The base is close to the rail 14 and separated from the base, so the depth of engagement between the convex lines and concave lines of the beading rail 14 and the concave lines and convex lines of the beading rolls 16a and 16b is equal to that of the beading rolls. The tips of 16a and 16b are large and the bases are small. However, when the forming process starts, the forming process load, which is almost a distributed load, is applied to the beading roll 16.
a, 16b, beading roll 1
6a and 16b are bent, and as a result, the size becomes larger toward the tip, and as a result, the processing portion 21 of the beading rail 14 and the beading rolls 16a, 16b are bent.
The depth of engagement between the convex lines and concave lines of the beading rail 14 and the concave lines and convex lines of the beading rolls 16a and 16b is approximately equal in all parts, and as a result, the can The shapes and depths of all beads processed into the shell 2 are approximately the same.

The above is an example in which the present invention is applied to a bead processing device using a pair of beading rolls supported in a cantilever shape, but bead processing using a single beading roll supported at both ends is possible. When the present invention is applied to an apparatus, since the center part of the beading roll 16' exhibits maximum deflection, the forming process load is applied with the center part 25 having the maximum diameter, as shown in FIG. 4A. When the beading rail 14 is not open, the center portion thereof should be closest to the beading rail 14. Also, 2
When the present invention is applied to a bead processing device for piece cans, one beading roll 16'' supported in a cantilever shape is used as shown in FIG. The free end of ″ is the maximum diameter.

In the beading roll described above, the inclination angle θ varies depending on the manufacturing method, can type, plate thickness, and material, but the plate thickness usually ranges from 0.08 to 0.08, which is used for beverage cans.
In the range of 0.35 mm can material, very precise bead cans can be made by using a tapered beading roll with an inclination in the range of 0°05' to 0°30'. Although the angle of inclination is very small, it is understandable considering that small variations in bead depth have a large effect on can strength. This small angle of inclination is also useful for the following facts. In other words, the beading roll is used to bead the can body by sandwiching it between the beading rails, but at that time, the can body does not slide along the outer surface of the beading roll due to the rotation of the beading roll. I have to move. The inner surface of the can is generally coated with paint to protect the contents, so any slippage will damage the coated surface. Even in the inclination angle range listed here, the circumferential speed of the beading roll's outer periphery is different between the large diameter part and the small diameter part, so the circumferential speed is different and slippage should occur, but this is not a problem because the inclination angle is small. .

[Example] Coffee beverage can (202 x 504, TFS0.7 material, 15
This bead is applied with a tapered beading roll supported on one side at an inclination angle of 0°8' to 0°12', and when beaded, a very precise bead depth and shape can be obtained.

[Brief explanation of drawings]

FIG. 1 is a front view showing a bead processing apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a beading roll according to an embodiment of the present invention, and FIG. 3 is a front view showing a bead processing apparatus according to an embodiment of the present invention. FIG. 4 is an explanatory view showing a beading roll according to another embodiment of the present invention, FIG. 5 is a front view of a bead can, and FIG. 6 is a front view showing the state of the processing device during bead processing. FIG. 7 is an explanatory diagram showing an example of a bead processing device; FIG. 7 is an explanatory diagram showing another example of a conventional bead processing device;
FIG. 9 is an explanatory diagram showing still another example of the conventional bead processing device, and FIG. 9 is a vertical cross-sectional explanatory diagram showing the state of bead processing by the conventional bead processing device. 1...can, 2,2'...can body, 3...bead, 11...
Bead processing device, 16a, 16b, 16'a, 1
6'b, 16', 16''...Beading roll, 2
1, 24...Processing part, θ...Inclination angle.

Claims (1)

[Claims] 1. A machining part of a beading rail fixedly located outside the can body and a machining part of a beading roll rotatably located inside the can body are located opposite to each other and work together to form the can body. A bead processing device configured to form a bead in a can body, wherein the beading roll has a larger diameter as the portion of the processing portion is more deflected by the forming load. bead processing equipment.