JPS6092028A - Expanding forming device of deformed di can - Google Patents

Abstract

PURPOSE:To prevent variance in shrinkage of can height in forming of a deformed DI can by pressing the flange part and bottom part of a DI can by a pusher, and at the same time, expanding the diameter by a segment inserted in the DI can. CONSTITUTION:The DI can 1 is held by a flange pusher pad 4 and a bottom pusher pad 7, and a support ring 6 and a segment 5 are inserted into the DI can 1 through an expander pin 3. When forming the DI can, the expander pin 3 is operated by a cam 9 through a cam roll 8, and the DI can 1 is expanded and deformed in radial direction by expanding the segment 5. At the same time, the bottom of the can is pressed in axial direction against the support ring 6 by the bottom pusher pad 7. In the flange part, the flange pusher pad 4 is pressed in axial direction by a cam 11 through a cam roll 10, and the DI can is shrinked.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an expanded forming apparatus for modified DI cans that prevents variations in can height reduction.

Generally, when a DI can is subjected to expansion processing to enlarge the outer periphery of the can body, the can height is usually reduced, but the rate at which the can height is reduced differs from one can to another, and also from part to part within the same can. This means that the variation in the height of empty cans subjected to the stretch band processing has increased, and the variation in can height may become a problem in the subsequent seaming process. The present invention aims to provide an extended molding apparatus for modified 01 cans that prevents this variation in can height reduction, and is as follows.

The present invention installs an expander pin and a bottom pusher pad on the outside of the bottom of a DI can to restrict the advancement of a flange pusher pad suppressing device, a bottom support ring that approximates the bottom wall surface inside the can bottom, and a bottom support ring that is close to the bottom wall surface of the can flange. A flange butcher pad that resembles the flange shape and prevents fluctuations in flange length is provided on the outside, and a plurality of divided segments having ring-shaped protrusions on the outer periphery are installed inside the can, and a An inclined hole that fits the slope of the tip of the expander pin is bored in the axis of the expander pin, and an expander pin and flange butcher pad suppressing device for pressing the divided segment and flange pusher pad are installed. This is an expansion molding device for modified DI cans.

The present invention will be further explained based on embodiments shown in the drawings.

Figures 1 and 2 are longitudinal cross-sectional views of the expanded band forming apparatus for modified DI cans of the present invention, and Figure 1 shows the loaded state of the 01 can 1 that has undergone neck-in processing and flanging before forming the expanded band. DI can] is held by a flange pusher pad 4 and a bottom pusher pad 7. That is, Figure 1 shows the state before the cam 9 held by the cam roll 8.8 at the left end of the expander pin 3 expands the segment 5, and the segment 5 is pulled toward the center axis by a spring (not shown). The can 1 can be inserted easily. The flange pusher pad 4 is also operated by the cam 11 via the cam roll 10, but this is also in a state before operation.

Figure 2 shows a modified DI can 2 formed by expand band forming, in which the expander pin 3 is actuated by a cam 9 via cam rolls 8, 8 to expand the segment 5. ．． 01 In order to deform the can 1 and simultaneously expand it in the radial direction and contract it in the axial direction, the bottom pusher pad 7 presses the bottom of the can against the support ring 6 in the axial direction, while the flange part is also moved by a cam roll by the cam 11. This is the state in which the flange pusher pad 4 is actuated and pressed in the can axial direction via the can 10.

That is, in order to prevent variations in can height reduction, the can height of the deformed DI can is regulated by the bottom pusher pad 7 and the flange butcher pad 4 during molding, and the can height is molded to a predetermined can height.

Figure 3 shows the operation timing diagram of the expanded band forming device, where the horizontal axis is time (tl), and the vertical axis is the operating state (g). Bad 4, ←~) is expander pin 3.

Next, we will explain the operation over time. When A completes loading the 01 can 1 before expansion band forming, the operation of (B) starts. At B, (a) presses the bottom of the can.

(H) is operated by a pneumatic cylinder, and follows the reduction in can height while keeping pressure on the bottom of the can. However, the pressing force is 0
It is strong enough not to give up on one can. ) At the same time, (c) starts operating and expands the can diameter. (C1 has can segment 5
At this point, (b) starts to operate, and (b) stops operating at the point when segment 5 is fully expanded. 2
is completed. After completion of molding, the expander pin 3 operates in reverse at E after a certain period of time, and the segment also reduces its diameter by the force of a spring (not shown), returning to the state of (Bl) at 0). The cam 1 begins to move away from the cam roll 10 and returns to the state of C1 (at Fl) due to the force of a spring (not shown).

f(l is the point in time when all the operations of Bii are completed (at Gl, the pneumatic cylinder operates in reverse, and at the river (returns to the A+ state).

Next, we will present the results of an experiment comparing the variation in can height between a modified DI can molded according to the present invention and a modified DI can when the support ring 6 and flange pusher pad 4 were not used.
Shown in the table.

, Table 1-1 The DI cans used in the above experiments before expansion molding were made of aluminum, had a can diameter of 94 mm, a can height of 151 m, and an expansion ratio of 8%.

]・From Table 1, it can be seen that the present invention using a support ring and flange pusher pad is superior.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the expanded band forming apparatus showing the state before expanded band forming, Figure 2 is a vertical cross-sectional view of the expanded band forming apparatus showing the state during expanded band forming, and Figure 3 is the expanded band forming apparatus. FIG. 2 is a diagram showing the timing of manufacturing. 1... DI can before extract band molding, 2... Deformed D
I can, 3... Expander pin, 4... Flange butcher pad, 5... Segment, 6... Support ring, 7... Bottom pusher pad, 8...
・Cam roll, 9... cam, 10... cam roll,
11...cam. Representative patent attorney Masaaki Akizawa Mitsugai two-person dialect IUjJ! U left? Kasumi Figure 3

Claims (1)

[Claims] (A bottom pusher pad is installed on the outside of the bottom of the IIDI can to restrict the advancement of the expander pin and the hinge pusher band suppression device L, and a bottom support ring that is close to the bottom wall (J!) is installed inside the can bottom, A flange shear pad that resembles the flange shape and prevents fluctuations in the length of the flange is provided on the outside of the can flange, and a plurality of divided segments having ring-shaped protrusions on the outer periphery are installed inside the cough can, and these divided segments A slanted hole that fits the fp+ surface of the tip of the expander pin is meticulously drilled as is common in the above, and an expander pin and flange pusher pad suppressing device for suppressing the divided segment and flange pusher pad are installed. Extended band molding equipment for modified 01 cans.