JPH0116572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a beading device used for beading a can body.

[Prior Art] In recent years, the can body metal materials used for food can containers have become thinner (gauge down), and at the same time, in order to strengthen the can, the can body 2 of the can 1 has been made thinner, as shown in Fig. 4. 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. This is handled by the buckling strength and paneling strength (radial deformation strength). 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.
After all, in order to obtain stable buckling strength and paneling strength, the bead shape and depth must be completely uniform, and partial shape changes tend to concentrate stress in that area, leading to strength instability. It has become clear. For example, a coffee beverage can (202 x 504,
TFS0.17 material, 15 beads), the paneling strength changes by changing the bead depth by 0.1 mm.
0.5Kg/cm ² , and the buckling load changes by 80Kg. For example, if the bead depth becomes shallower by 0.1 mm, the paneling strength will decrease.
It decreases by 0.5Kg/cm ² and the buckling load increases by 80Kg. Furthermore, when the bead depth increases by 0.1 mm, the paneling strength increases by 0.5 kg/ ^cm2 , but the buckling strength decreases by 80 kg.

[Problems to be Solved by the Invention] However, when processing such a bead 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 mainly consist of beads. They are a deing 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. 5, 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 supported on the opposite side, and the bead processing is performed while rotating with both ends supported, and as shown in FIG. 6, 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. 7, 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 thickened to provide rigidity, but the thickness is restricted due to the condition that the beading roll is inserted inside the can, and in reality In this case, the beading rolls and the like are deflected by the action of the forming process load, and in areas where the amount of deflection is large, the can bodies 2 and 2' are not sufficiently processed.
The depth of the bead becomes smaller. For example, in the case of the processing type shown in FIG. 6, as shown in FIG. The bead becomes smaller than the depth, and the shape of the bead becomes non-uniform, which affects the buckling strength and paneling strength mentioned above, and causes the can to be in an unstable state.

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.

[Means for Solving the Problem] Corresponding to this object, the can body bead processing device of the present invention includes a beading section of a beading rail that is fixedly located outside the can body, and a beading section that is located inside the can body. A bead processing device is configured such that a processing portion of a rotatably located beading roll is located opposite to the processing portion of the beading roll and is configured to cooperate with each other to form a bead on the can body, the processing of the beading roll. The rotating shaft of the beading roll and the beading rail are positioned closer to the beading rail in a state where the forming load is not applied to the part of the part that has a larger amount of deflection due to the forming load. are located at an angle relative to each other.

[Function] In the bead processing device configured as described above, when performing bead processing, the can body is positioned between the beading rail and the beading roll, and the beading roll is rotated. The can body undergoes bead forming between the processing area of the beading roll and the processing area of the beading roll. Since the processed part of the beading roll is tilted by the installation angle φ or the inclination angle θ when installed, the tip of the processed part of the beading roll is beaded when no forming process load is applied and before forming process. Close to the rail, the base is spaced apart. However, when the forming process starts and a forming process load that is almost a distributed load is applied to the beading roll, the beading roll becomes deflected, and the size of the bending increases toward the tip. The machining part of the beading roll is almost parallel to the machining part of the beading roll, and the depth of engagement between the machining part of the beading rail and the machining part of the beading roll is almost equal in all parts. The shapes and depths of the two are almost the same.

[Example] Hereinafter, details of the present invention will be explained with reference to drawings showing an example.

In this invention, the rotating shaft of the beading roll and the beading rail are arranged in such a manner that the part of the beading roll that is deflected more due to the forming process load is positioned relatively closer to the beading rail. is installed at an angle.

There are two techniques for relatively tilting the beading roll rotation axis and beading rail: one is to install the beading roll with the rotation axis tilted, and the other is to use an inclined beading rail as the machining part. There are two implementations. First, the former embodiment will be described with reference to FIG. 1 as a first embodiment, and the latter embodiment will be described with reference to FIG. 2 as a second embodiment.

[First Embodiment] In FIG. 1, 11 is a bead processing device for a three-piece can. FIG. 1 shows the positional relationship between the beading rail 14 and the beading roll 16 in a stationary state. FIG. 1b shows the positional relationship between the beading rail 14 and beading roll 16 during processing. The bead processing device 11 includes a beading rail 14 and a spindle 1.
5. It is equipped with a beading roll 16. The beading roll has a processed portion 24 of equal diameter in the axial direction. 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.

The beading roll 16 is located on the inside of the beading rail 14, facing the beading rail 14 at an angle of an angle φ, and has its base end fixed to the spindle 15.
The mounting angle φ is the angle between the center of rotation of the beading roll 16 and the processed part of the beading rail, and this angle is determined by adjusting the angular position when mounting the beading roll 16 on the spindle 15. be done. This angular position adjustment can be done, for example, by using a shim 3 between the holding base 20 and the spindle 15.
This can be done by inserting 0. Therefore, the beading roll 16 projects from the spindle 15 in the form of a cantilever, with the tip end serving as a free end and the base end serving as a fixed end.
The outer periphery of the beading roll 16 on 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 convex line 22 and concave line 23 of this beading roll 16 correspond to the concave line 19 and convex line 18 of the beading rail 14. Here, it is especially important to note that
As shown in FIG. 1, the processed portion 24 of the beading roll 16 has the same diameter in the axial direction, but is attached to the processed portion 21 of the beading rail 14 at an inclination of an installation angle φ.

In the bead processing apparatus constructed in this way, when performing bead processing, the can body 2 is set inside the beading rail 14 using the can guide as a guide, as shown in FIG. By inserting the beading roll 16 attached to the spindle 15 inside and rotating the beading roll 16, the ridges 18 and 19 of the beading rail 14 and the grooves 23 and 22 of the beading roll 16 are removed. The can body 2 undergoes bead forming processing between the two. Processing part 2 of beading roll 16
4 is inclined by the mounting angle φ, so in the state before the forming process where no forming process load is applied, the tip of the processed part 24 of the beading roll 16 is close to the beading rail 14, and the base is separated from the beading rail 14. Therefore, the beading rail 14
The convex lines and concave lines and the concave lines of the beading roll 16,
The depth of engagement with the convex strip is 16 mm.
Larger at the tip and smaller at the base. However, when the forming process starts and a forming process load that is almost a distributed load acts on the beading roll 16, the beading roll 16 is bent, and the size becomes larger toward the tip, and as a result, the beading rail 1
The processed area 21 of the beading roll 16 and the processed area 24 of the beading roll 16 are almost parallel, and the convex and grooved lines of the beading rail 14 and the beading roll 16
The depth of engagement with the concave and convex lines is approximately equal in all parts, and as a result, the shapes and depths of all the beads processed on the can body 2 are approximately the same.

[Second Example] In the above-described first example, in a state where no forming process load is applied, the part of the processed part of the beading roll that has a larger amount of deflection due to the forming process load approaches the beading rail. In order to position the beading roll at an angle of φ, the beading roll is installed at an angle of φ, but in addition, the part of the beading roll that is more deflected by the forming load is positioned closer to the beading rail. For this purpose, a configuration as shown in FIG. 2 can be adopted. FIG. 2a shows the positional relationship between the beading rail and beading roll in a stationary state. FIG. 2b shows the positional relationship between the beading rail and beading roll during processing. As shown in FIG. 2, the beading rolls 16a and 16b have the same diameter in the axial direction.
The larger the bending amount of the beading rolls 16b (the tips of the beading rolls 16a, 16b in the illustrated case), the more the beading rolls 16a, 1 are processed when the forming process load is not applied.
A processing portion is formed on the inclined surface of the beading rail at an angle of inclination θ so as to approach the axis of the beading rail 6b. This angle of inclination θ is unique for each beading rail, but the magnitude of θ is equal to the mounting angle φ. In this case as well, when beading the beading rolls 16a and 16b, the beading rolls 16a and 16b bend under the forming load and become parallel to the beading rail 14', as shown in FIG.

[Effect of the invention] In the beading roll described above, the inclination angle θ and the mounting angle φ vary depending on the manufacturing method, can type, plate thickness, and material, but the plate thickness is usually 0.08 to 0.35 used for beverage cans. In the range of mm can material
The beading rail with an inclination in the range of 0°05' to 0°30' and the beading roll mounted at the mounting angle make it possible to create a bead can with very high precision. Although the inclination angle and the mounting angle are very small, it is understandable considering that small variations in bead depth have a large effect on the can strength.

FIG. 9 shows the bead depths of a can with a bead manufactured by the conventional technique with a mounting angle φ=0 and an inclination angle θ=0 and a can with a bead formed by the bead processing apparatus of the present invention. This is a graph comparing variations.

The sample can is 500 with a can body outer diameter of 68 mm and a can height of 168 mm.
Using 5 g cans each, 15 beads were formed in each sample can. Of the 15 beads, seven on one side are numbered 1 to 7 in order from the bead at the edge of the can to the bead at the center of the can.

From this graph, it can be seen that there is a large difference in bead depth from No. 1 to No. 7 for beads molded using the conventional technology, whereas beads molded using the technology of this invention have a large bead depth from No. 1 to No. 7. It can be seen that there is almost no difference.

[Other Embodiments] In the embodiments described above, the beading roll is supported in a cantilevered manner, but as another embodiment, the present invention provides bead processing using a beading roll supported at both ends. It can also be applied to devices.

However, in the case of beading rolls that are supported at both ends, the part where the amount of deflection is greatest due to the forming processing load is approximately at the center of the processing area of the beading roll, so the rotation axis of the beading roll must be tilted when installed. I can't. Therefore, in this case, in order to realize a state in which the larger the amount of deflection due to the forming process load among the processed parts of the beading roll is located closer to the beading rail in a state where the forming process load is not applied. In this case, the machined part of the beading rail is inclined with respect to the rotating axis of the beading roll, which is located horizontally. Therefore, it is necessary to use a beading rail with an inclined processing area.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a bead processing device according to one embodiment of the present invention, FIG. 2 is a front view showing a bead processing device according to another embodiment of the invention, and FIG.
The figure is a front view showing the state of the bead processing device shown in FIG. 2 during bead processing, FIG. 4 is a front view of the bead can, FIG. 5 is an explanatory diagram showing an example of the conventional bead processing device, and FIG. 6 is an explanatory diagram showing another example of the conventional bead processing device, FIG. 7 is an explanatory diagram showing still another example of the conventional bead processing device, and FIG. 8 is an explanatory diagram showing a bead processing state of the conventional bead processing device. The longitudinal section explanatory diagram and FIG. 9 are graphs showing experimental results. 1...can, 2,2'...can body, 3...bead,
11... Bead processing device, 14, 14'... Beading rail, 16, 16a, 16b... Beading roll, 21, 24... Processing part, θ...
...Inclination angle, φ...Mounting 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. The bead processing device is configured to form a bead in a state in which a portion of the processing portion of the beading roll that has a larger amount of deflection due to a forming processing load has a larger amount of deflection when the forming processing load is not applied. A beading device for a can body, characterized in that the rotating shaft of the beading roll and the beading rail are located close to the beading rail so as to be inclined relative to each other.