JPH0110103Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an impact forming apparatus for thin metal molded products, and is applicable not only to the outer circumferential surface of the body which has the same outer diameter, but also to the outer circumferential surface of the shoulder whose outer diameter gradually decreases. This invention relates to an impact molding device for molding an impact molded product in which a vertical stripe pattern continuous with a part is integrally molded.

That is, an object of the present invention is to provide an impact molding apparatus for molding an impact molded product having a vertically continuous vertical striped pattern over the entire outer circumferential surface.

Conventionally, in order to engrave a protrusion pattern on the outer circumferential surface of a metal (mainly aluminum) molded product such as the outer can of an aerosol container, a special molding process is required on the outer circumferential surface of the molded product that has already been formed into a cylindrical shape. It was processed to form a protruding pattern.

The protrusion pattern is formed on the outer peripheral surface of the metal cylindrical molded product after the molded product has been molded into a predetermined shape. It is completely impossible to form a shape in which the outer diameter gradually decreases with respect to the outer circumferential surface of the torso, and in fact, even though the outer circumferential surface of the torso has a ridge pattern, there is no ridge pattern on the outer circumferential surface of the shoulder. It wasn't molded.

In addition, conventional protrusion patterns are formed by pressing a roller against the outer circumferential surface of a molded product that has already been formed into a cylindrical shape, so the molded product must have a straight cylindrical shape and may be modified depending on the situation. In the past, there were drawbacks such as the molded product becoming distorted due to the pressing force of the roller against the molded product.

In this way, a metal cylindrical molded product with a protrusion pattern, including a vertical stripe pattern, formed on the outer circumferential surface is significantly limited in the range in which the protrusion pattern is formed, and requires a large number of molding steps. There were many drawbacks and dissatisfied points, such as the shape of the molded product sometimes becoming distorted due to the ridge pattern molding operation.

The present invention was devised to eliminate the drawbacks of the conventional methods described above, and is capable of forming an impact molded product having a continuous vertical stripe pattern over the entire outer circumferential surface regardless of changes in the outer diameter. It is related to the device.

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

(See Fig. 5 below) This shows the outer can of the aerosol container formed by the device of the present invention shown in Fig. 5, in which the outer diameter of the body of the molded product S is increased upwards. A continuous vertical stripe pattern M is formed on the entire outer circumferential surface including the shoulder portion which is gradually reduced.

The vertical striped pattern M formed on the entire outer circumferential surface of the molded article S is not formed on the bottom surface of the molded article S, and its forming location is limited to the outer circumferential surface of the molded article S.

Next, a first embodiment of the impact molding apparatus according to the present invention for molding the molded product S shown in FIG.
This will be explained with reference to FIGS.

The impact forming device according to the present invention has a punch P
A large number of mold grooves KR' are formed on the inner peripheral surface along the axis at the opening of the forming space K' of the metal K, which is impact-formed into a cylindrical shape by impact-forming a flat plate-shaped material S' made of aluminum or other metal. , and attach a ring-shaped mold ring KR with the diameter of the hypothetical circle connecting the bottom of this mold groove KR′ set to a value that is equal to or slightly smaller than the diameter of the molding space K′.
The mold groove KR' is located on the inner circumferential surface of the opening of the molding space K' of the mold K, and the bottom surface of the molding space K', which has a cylindrical blind hole shape, is formed with a raised surface with a truncated triangular pyramid shape in the center. In addition, the tip surface of the cylindrical punch P has a structure in which the center part has a depressed triangular truncated pyramid shape so that the bottom surface of the forming space K' can be fitted almost tightly. It's summery.

The depth of this mold groove KR' is sufficient as long as it can form the vertical striped pattern M on the outer peripheral surface of the molded product S that is impact-molded by the punch P and the mold K.
This value is extremely small, and is much smaller than the wall thickness of the molded product S.

In addition, the upper corner of the inner circumferential surface of the mold ring KR in which the mold groove KR′ is formed is preferably rounded so that the elongation deformation of the material S′ by impact molding of the material S′ can be smoothly achieved. It is good to form a mold groove KR' also in this rounded corner.

Furthermore, the bottom surface of the molding space K' has a raised central part in the shape of a truncated triangular pyramid.
The tip of the punch P, which faces the bottom of K', has its center depressed in the shape of a truncated triangular pyramid.
This is to enable the molded product S to have a more stable self-supporting function, and to improve the mechanical internal pressure resistance at the bottom of the molded product S.

As described above, in the impact molding device according to the present invention, the mold ring KR is arranged with the mold groove KR' located at the opening of the molding space K'. Therefore, when the material S' is pushed into the molding space K' and impact molded, the material S' pushed by the punch P into the molding space K' forces the surface forming the outer peripheral surface of the molded product S into the mold groove KR'. The vertical striped pattern M is extended and deformed while being pressed against the molded product S.
The molded product S is molded simultaneously with the impact molding, and the center portion of the bottom surface of the molded product S is molded into a raised and curved truncated pyramid shape.

In this way, since the mold groove KR' is located at the opening of the molding space K', the outer circumferential surface of the cylindrical molded product S (primary molded product) impact-molded from the material S'. A continuous vertical stripe pattern M is formed over the entire height range, and this primary molded product S
Even if the material S' is separated from the material S' and the finished molded product S as shown in Fig. 5 is tightened and finally formed, the vertical striped pattern M in the tightened part does not disappear and remains as it is. As a result, the vertical striped pattern M is formed in a completely continuous state over the entire outer surface of the molded product S having different outer diameters.

By the way, in order to change the form of the vertical striped pattern M to be molded, it is sufficient to simply replace it with a mold ring KR having a mold groove KR' corresponding to the vertical striped pattern M of the desired form. It is easy to form the striped pattern M, and the changing operation is also simple.Furthermore, the shape of the mold ring KR is simple and the mold groove is simple.
The molding of KR is also extremely easy, and changes in the uniform longitudinal pattern M can be easily achieved.

In addition, in this type of impact molding equipment,
It is the opening of the molding space K' of the mold K that is most likely to wear and be damaged, but in the case of the present invention, the mold ring KR is installed as a separate object from the mold K at the opening of this molding space K'. Since the mold ring KR is attached, there is almost no damage to the extremely expensive mold K, and if wear or damage does occur, the mold ring KR can be manufactured at low cost and can be easily replaced, so it has a long lifespan as a molding device. It is long and easy to manage and operate.

Furthermore, since the vertical stripe pattern M is formed at the same time as the impact molding of the main body of the molded product S, there are fewer molding steps to complete the molded product S, and an independent special device for forming the vertical stripe pattern M is not required. This has great effects in terms of man-hours and costs, such as greatly reducing equipment costs.

Furthermore, the vertical striped pattern M formed on the molded product S
is molded on the entire outer peripheral surface of the molded product S, which has a cylindrical shape beyond the bottom, in a form that is completely continuous vertically, regardless of the difference in the outer diameter of each part, so the vertical striped pattern M of the molded product S The appearance of the molded product S is not half-finished, and the appearance of the molded product S is more preferably formed by the vertical striped pattern M.

Furthermore, the bottom of the molded product S to be molded is
Since the center portion of the bottom wall is formed into a raised and curved truncated pyramid shape, it exhibits extremely good self-supporting ability and extremely high internal pressure resistance and mechanical strength.

As is clear from the above description, since the present invention has a vertical stripe pattern M that is completely continuous vertically over the entire outer peripheral surface of the molded product S, it is possible to obtain a good appearance of the molded product S due to the vertical stripe pattern M. In addition, the molded product S can be molded with less man-hours and costs, and can be easily operated and managed as a molding device and has a long life. Furthermore, the form of the vertical striped pattern M can be easily changed, and furthermore, It has many excellent effects such as being able to mold a molded article S having an extremely high self-supporting ability and stability, and having a bottom portion that is resistant to internal pressure and has high mechanical strength.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing the arrangement of each component of the device of the present invention before molding, Fig. 2 is a longitudinal cross-sectional view of the mold during clamping, and Fig. 3 is a plane view of the mold ring, which is the main part of the device of the present invention. 4 are enlarged sectional views of the portions marked with circles in FIG. 3. FIG. 5 is a front view of a molded article of the present invention formed as an outer can for an aerosol container. Explanation of the code, S... Molded product, M... Vertical striped pattern,
P...punch, K...mold, K'...molding space,
KR...Mold ring, KR'...Mold groove, S'...Material.

Claims (1)

[Scope of utility model registration request] A cylindrical punch P is used to stretch and push a predetermined flat metal material S' into a molding space K' formed in a cylindrical blank hole shape formed in a mold K to form a cylinder. Shaped molded product S
This is an impact molding device for molding, in which a large number of mold grooves KR' are cut and molded along the axis on the inner peripheral surface of the opening of the molding space K', and the bottom surfaces of the mold grooves KR' are connected. A ring-shaped mold ring KR is installed in which the diameter of the virtual circle to be formed is set to be equal to or slightly smaller than the diameter of the molding space K', and the bottom surface of the molding space K', which has the cylindrical blind hole shape, is attached. of,
An impact molding device, wherein the center part has a raised surface shape with a truncated triangular pyramid shape, and the tip surface of the cylindrical punch P has a depressed center part with a truncated triangular pyramid shape.