JPS60257937A - Production of container - Google Patents

Abstract

PURPOSE:To improve axial load resistance, etc. by reducing diametrally the aperture end side of a container into a step shape then subjecting further the same to spinning. CONSTITUTION:The aperture side end of a can is double-necked by plural times of pressing. The lower pat of the can is driven and rotated by a gripper 24 and the upper part is disposed with flanging rolls 26 and a pressing roll 38. The aperture end extends toward the outside in the diametral direction and is pressed by the collar of the rolls 26, by which a flange 18 is formed when the can 20 is rotate and a flanging device 28 is fed to the can 20. The aperture end of the can 20 is spinned when the roll 38 is moved in the direction A while said roll is pressed to the outside periphery of said end. The double-neck step part is thus eliminated and the diameter at the aperture end is reduced. The stress concentration in the step part is prevented by such method, by which the axial load resistance is improved and the weight of a cap is reduced as well.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to -1- manufacturing method of a container including step 7: reducing the diameter of the front end side of a container that has been drawn and ironed and is in the process of being completed. The present invention relates to improvements in the container of the present invention). Juru (valid when used in h.

[Prior art and its problems] Conventionally, for example, in the case of a heel can T, in order to reduce the size and weight of the can lid, deep drawing and sawing processes were used as shown in Figs. 1 and 2. The straight edge of the open end of the finished can 10 is narrowed in stages to 2 or 3 steps (double neck processing or 1~ripple neck processing 4f can be performed to reduce the diameter). However, when a can with a stepwise diameter reduction part of this scale is pressed toward the bottom of the can to remove the lid, Due to the load in the axial direction of the can, that is, stress is concentrated at the part where the curvature of the stepwise diameter-reduced part suddenly changes due to the load in the axial direction of the can, causing buckling and the can retracting, resulting in defective products. There was a bright spot that it was easy to occur.If the wall thickness of the can was made thicker so that the can would not sit when installed,
There were two drawbacks: high production costs.

In order to solve such a moving point, a method of manufacturing a one-hole container is being considered in which the diameter is reduced directly by spinning without performing the double-neck or triple-neck processing. However, in this type of manufacturing method, the neck processing is not performed, and the diameter of the opening end of the container is reduced using a J-cut directly during the spinning process. As a result, it is difficult to reduce the diameter and the spinning process takes time, which impedes improvement in work efficiency and furthermore, there are problems in that the dimensional accuracy of the reduced diameter portion is poor.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to easily reduce the diameter near the frontage end, and to reduce the diameter of the area near the end of the frontage. It is an object of the present invention to provide a method for manufacturing a 1q container with improved axial load resistance.

[Structure of the Invention] The gist of the present invention, which has been made to achieve such an object, is to reduce the diameter of the front end of a container that has been squeezed and squeezed 3- 43. A method for manufacturing a container comprising two steps: a neck processing step of reducing the diameter of the open end side in steps, and smoothing and roughening the portion reduced in diameter in steps by the neck processing step. This method includes a spinning process that reduces the diameter.

[Example] Hereinafter, an example in which the container manufacturing method of the present invention is applied to beer cans will be described in detail based on the drawings.

In Fig. 1, numeral 10 is a cylindrical can with a bottom.The plate material of a certain thickness is pressed by pressing and kept at a constant temperature, and the bottom part is domed by doming. It is formed into a shape. These processing steps are well-known steps and detailed explanations will be omitted.

As shown in FIG. 2 (1), the front end side of the above-mentioned structure 10 is neck-processed so that the diameter is reduced in two steps in a stepwise manner, resulting in a so-called double neck. This necking process includes a first step in which the diameter of the opening end of the can 10 that is being completed is reduced by press working to form the first reduced diameter part 14 shown in FIG. A portion closer to the opening end is further reduced in diameter to form a second step 16.

In this way, the partially completed can 12 is molded.

Since the neck processing process described above is also well known, detailed explanation will be omitted.

Next, as shown in FIG.
8 is formed, and the half-finished can 20 is molded, and the first reduced diameter part 14 and the second reduced diameter part 16 are smoothed by diameter reduction spinning, and at the same time, the front end is reduced in diameter, and the can 20 is formed. The half-finished can 22 shown in FIG. 5 is molded. Each of the above spinning processes is performed as follows. That is, as shown in FIG. 4, the can 12 (molded in the previous process of the can 20) is chucked by a gripping device 24 attached to the main shaft of a rotational drive device (not shown), and the can 12 is driven and rotated. A flange forming device 28 having two flange forming rolls 26 is disposed on the open end side of the can 12.

The flange forming device 28 is attached to a reciprocating shaft 30 (
A pair of rotating shafts 34 are rotatably arranged on the supported member 32, and the flange forming roll 2 is attached to the rotating shaft 31'l.
6 is fixed. As shown in FIG. 4, the forming roll 26 has a tapered portion whose base extends in the diametrical direction and has a brim shape. The dimension between the outer ends of the tapered portions of the two forming rolls 26 is made slightly smaller than the inner diameter of the open end of the half-finished container 12 shown in FIG. There is.

By driving and rotating the gripping device 24, rotating the can 20, and feeding the flange forming device 28 toward the can 20, the front end of the can extends diametrically outward and is pressed by the tail of the forming roll 26. Flange 18
is formed. This is flange forming spinning process.

On the side of the flange forming device 28, a diameter reducing machine 40 having a pressing roll 38 mounted on a rotating shaft 36 is arranged. Simultaneously with the flange forming spinning process, when the pressing roll 38 is moved in the direction of the arrow in FIG. 4 while pressing against the outer periphery of the can 20 near the bottom end, the spinning process is performed as shown in FIG. 6, forming a double neck. The stepped portion is eliminated and the opening becomes smooth, and the diameter of the opening end is reduced.

This is diameter reduction spinning processing. According to this embodiment, spinning is easy because the diameter near the open end has already been reduced by the double neck processing.

Further, the flange forming spinning process and the one-end diameter reduction spinning process may not be performed simultaneously, but may be performed separately as shown in FIGS. 7 and 8.

The diameter reduction spinning process is performed as shown in FIG. That is, an inner roll 46 attached to a rotating shaft 44 is placed inside the open end of the can 12 . The inner mold 46 is formed into a predetermined cross-sectional shape in order to form the front end of the can 12 into a desired shape. Next, the can 12 is driven to rotate and moved in the direction of arrow B while pressing the outer periphery of the can 12 with the pusher wheel 38. As a result, the front end of the can 12 becomes Il? The diameter is i. Next, as shown in Fig. 8, the flange forming equipment @2
8, flange spinning is performed in the same manner as in FIG.

As described above, according to this embodiment, the diameter of the opening end of the can is reduced in advance by neck processing F, and the diameter is further reduced by spinning processing, so that the size to be reduced is small and diameter reduction is easy. , dimensional accuracy can also be improved. Therefore, the diameter of the can lid can be reduced, the weight of the can lid can be reduced, and production costs can be reduced. In addition, since the stepped part created by neck processing is cleaned by spinning J+11 and the stepped part is removed, stress concentration is alleviated and the can is prevented from being crushed and defective products due to the load when attaching the can lid. It can be prevented. However, it is possible to improve the axial load resistance when attaching a can lid to a can.

In the above embodiment, a double neck is formed by neck processing, and as shown in FIG. Can 48t, ml, 1. , Ia7. Itsu, Sei), Yo
Even in such cases, it is possible to suitably carry out the present invention, and the diameter of the vicinity of the open end of the can 50 can be smoothly reduced as shown in FIG. 10. In this case, the same effect as in the above-mentioned embodiment is produced.In particular, since the opening end is formed in three stages, there is an advantage that the diameter reduction spinning process of the opening end is easy.

[Experimental Example 1] The following experimental results were obtained through an experiment based on the inventive concept of the present invention. The material used in the experiment was American Aluminum Association standard A3004-1-
119 (aluminum comb), cumulative plate thickness 0.35 mm,
The plate thickness at the flange part is 0.19 mm, and the plate thickness near the open end is 0.
I used a 19mm one, and the can diameter was 35mm.
(a) In the case of the double neck shown in Fig. 3, the opening end outer diameter D1 is 5Q, 3 mm, and the diameter Ll of the reduced diameter part is 17.
5ml, and the outer diameter D2 of the opening end after the spinning process according to the above example is 57n+n+.

The quality of the reduced diameter part -2 is 15 mm, and (b) In the case of -J-1 to Rippleneck shown in Figure 9, the outside diameter of the frontage end is D3.
was 57.4 mm, the open end outer diameter D4 after spinning was 53.1 mm+, and the length L4 of the reduced diameter portion was 2 Q mm.

-9- That is, in the case of (a) above (spinning T after double neck processing), the diameter ratio of the canned food is 5.5 compared to the conventional example.
%, and the weight ratio decreased by 11%. In the case of (b) (spinning processing after triple neck processing), compared to the conventional example, the diameter ratio of the can lid is reduced by 7.5%, and the weight ratio is reduced by 14.
It decreased by 5%.

Also, 211 cans (nominal can diameter is 211/16 inches)
The axial load strength is 7s1, that is, in the test to see if the can will collapse due to the axial load, the axial load strength is 1981 (0) for the conventional single neck and 159 k (J, t-real for the double neck). 117k for neck
However, in the case of the example of the present invention, the axial load strength is 205 kg, which is higher than any of the conventional examples.

In each of the above embodiments, the can is rotated μ and the flange forming device 2
8. The diameter-reducing spinning device 40 and the inner roll 40 do not revolve around their own axis, but they are fixed to the can, and the device 28.40 and the inner roll 46 are made to revolve while rotating on their own axis. It is also possible to rotate the cans in the opposite direction at the same time, and it is also possible to rotate the cans simultaneously within a range that creates a difference from the orbital speed of 10-10 on each day. In addition to beer cans, the present invention can also be applied to clear cans, cans for various beverages and water (liquid), cans for seasoning, and can containers for storing powders, liquids, gases, solids, etc. It can also be applied to can containers other than aluminum.

Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and may be implemented in various forms without departing from the gist of the present invention. Of course you can.

[Effects of the Invention] As described in detail above, according to the present invention, the open end side of the container is reduced in diameter through the neck processing step and then the spinning processing step, so that shrinkage is easy and the front end diameter can be reduced. As a result, the weight of the lid 14 can be reduced and the dimensional accuracy of the end portion of the weight can be improved.Furthermore, since the spinning process is performed after the neck process, the stepped part caused by the neck process can be smoothed out. As a result of (a), the stress concentration can be alleviated, and the axial load neutrality when removing the lid material is improved by 1!1q.

[Brief explanation of the drawing]

Figure 1 shows the first step in an embodiment of the present invention]
] Figure 2 is a sectional view showing a can in the process of being completed. FIG. 3 is an enlarged sectional view of the main part of the can shown in FIG. 6 is an enlarged sectional view of the main part of the can shown in FIG. 5, and FIG. 7 is a sectional view showing another device used in the spinning process. 8 is a cross-sectional view showing the apparatus used for flange processing in the above-described embodiment, and FIG. 9 is an enlarged cross-sectional view of the main part of a can in the process of being completed by the neck processing process of another embodiment of the present invention. Figure 10 (This is an enlarged sectional view of the main part of a can formed by spinning in the same example. 10.12.20,22...Can (container in the process of being completed)
-12- Figure 6-11110-- Figure 8↑↓ , 2B 0 2 4--- 6 0 ---24 7 tank injection 0-257937 (8) Figure 9 Figure 10)

Claims (1)

[Claims] 1. A container that includes the step of reducing the diameter of the front end of a finished container that has been squeezed and ironed! ! In the J construction method, there is a neck processing process in which the diameter of the front end side is reduced in stages, and a spinning process in which the diameter is further reduced while smoothing the cotton part in steps by the neck processing culm. Processing J
A method for producing a container characterized by containing a culm. A method for manufacturing a container according to claim 1.