JP2000190042A - Bottle type metallic container can barrel molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of wrinkles at a shoulder part profile in a multi divisional molding by nipping a can barrel having a can top part shoulder shape of a shoulder part profile with a die face shape having a shoulder part profile and a wrinkle presser for applying a redraw molding and, a preliminal molding of a can top part with a punch shoulder shape punch. SOLUTION: After No.2 shoulder part molding is finished, a shoulder part is molded into an (a+b) shape and a profile of a can top part is in a c shape. This can barrel is set with No.3 shoulder part molding die and is nipped by a wrinkle presser whose shape is a profile c. The barrel is redrawn by applying a pressurization press from an upper end. A can top part profile c is added to the shoulder part (a+b) and it becomes a shoulder part (a+b+c). Simultaneously, the can top end is molded to a profile d with a punching die. This mold processing is carried out sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a bottle-shaped (for example, a beer bottle-shaped) metal can body and a bottle-shaped metal container can body in which a shoulder and a neck portion projecting upward from the can are integrated. Things.

[0002]

2. Description of the Related Art In recent years, metal cans have been widely used for drinks such as beer, and recently, containers called plastic bottles have started to appear as soft drink containers.
On the other hand, glass bottles that have been used for a long time are very popular for beer because of their smart shape and ease of pouring. However, glass bottles are heavy and easily broken,
The work of loading, transporting, and selling beer and drinking water, and also the work of returning, are heavy and the workability is poor. Furthermore,
In the case of re-use, cleaning the bottle and checking the flaws are also burdensome.

[0003] Metal container cans such as beverage cans have a bottom,
3-piece can consisting of body and top lid or DI processing or D
2 consisting of body and top lid including can bottom formed by TR processing
A piece can is put into practical use, and in any case, an easy-open lid that can be easily opened by a human hand is used as a lid.
This easy-open lid can is easy and convenient to open, but is inferior to beer bottles in terms of smartness and ease of pouring.

On the other hand, recently, containers having caps called PET bottles, which can be resealed after opening (hereinafter referred to as reseal), are becoming popular in the city.
Since this PET bottle is made of PET resin, the strength and rigidity of the container are low, and the PET bottle lacks light shielding properties. Therefore, the lowering of the transport speed on the container production line and low productivity, and also the disadvantage that the high-speed transport and filling speed are similarly reduced when filling the contents, lowering the workability,
In addition, beer has a drawback that it deteriorates in quality and cannot be applied. Furthermore, there is a major problem such as poor recyclability due to the difference in composition and color between the body and the drinking part, discarded as incineration garbage, not only wasting resources but also shortening the life of the incinerator. ing.

Recently, a metal can for beverages has been disclosed in
JP-A-180382 or JP-A-8-117904 discloses a method for manufacturing a high-pressure gas container. The means disclosed in JP-A-10-180382 discloses a method in which a can body and a can project upward. It is not a bottle-shaped metal container can body where the shoulder and neck are integrated,
The present invention is directed to a can having no problem of forming a profile of a shoulder and a neck portion of the present invention. On the other hand, the means disclosed in Japanese Patent Application Laid-Open No. HEI 8-117904 has a plate thickness of about 4 mm. 0.2 of target plate thickness of can
about 10 times thicker than around 10 mm.
The present invention relates to a method for manufacturing a high-pressure container that is extremely gentle by as much as 100 times, and a technique for forming a profile of a shoulder and a neck portion of a bottle-shaped metal container can body, such as a beverage can, to which the present invention is applied has not yet been proposed.

[0006]

An object of the present invention is to provide a bottle-shaped metal container can body in which a can body and a shoulder and a neck protruding upward from the can are integrated with each other. It is an object of the present invention to provide a method for forming a profile of a shoulder and a neck portion protruding from a wedge without wrinkling.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present inventors have conducted a detailed investigation on the above-mentioned features of the prior art and a technique for forming a shoulder and a neck profile without wrinkling, and have conducted various studies. The present invention was completed by conducting a press molding experiment of the present invention, and the gist of the invention is as follows. (1) In a method of forming a bottle-type beverage metal can in which a can body and a shoulder and a neck portion projecting upward from the center of the can body are integrated, a cylindrical can is formed by multi-stage redrawing (DRD or DTR) or DI processing. (A) using a can body having the shoulder shape of the top of the shoulder profile to be divided and formed in the process, and (b) dividing and forming in the forming process. A die having the profile of the shoulder portion to be formed and a dice having a wrinkle holding surface shape sandwiched between the dice and the wrinkle holder are redrawn by a redraw forming method having a point of suppressing the generation of wrinkles, and are already divided and formed. In the shoulder part of the profile (in the case of the first division molding, at the predetermined height of the can body part), the shoulder part profile to be divided and molded in the process (C) pre-shaping the can top with a punch shoulder-shaped punch having a shoulder profile to be split and formed in the next step, at least (a) & ( b) or a method for forming a bottle-shaped metal container can body, which satisfies the conditions (b) & (c). (2) In the molding method of (1), the condition of (a) is set as follows: (a) using a can body having a can top shoulder shape having a profile similar to a shoulder portion profile to be dividedly molded in the process; A) A method for forming a bottle-shaped metal container can body, in which (c) the top of the can is preformed with a punch shoulder-shaped punch having a profile similar to the shoulder profile to be split and formed in the next step. (3) In the molding method of (1) or (2) above, when performing multistage redrawing of the shoulder and the neck, the profile to be divided and formed is subjected to multistage redrawing with a profile that is easy to mold and approximates the shoulder portion profile. And forming the desired body-shoulder and neck profiles by restriking. (4) In the molding method according to any one of (1) to (3), the metal container can body molded by each method is
Further, a method for forming a non-cylindrical bottle-shaped metal container can body, which is formed by restriking into a shape such as a square, a hexagon or an ellipse including a body.

According to the molding method of the first aspect of the present invention, in the molding of a bottle-shaped metal container can body in which a can body and a shoulder and a neck protruding upward from the can are integrated, This allows the profile of the protruding shoulder and neck to be formed without wrinkling.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The detailed description of the constituent conditions of the present invention will be given below by way of examples. (Embodiment 1) FIGS. 1 and 2 show the respective embodiments of the "formation of a bottle-shaped metal container can body in which the can body is integrally formed with a shoulder and a neck portion projecting upwardly from the can". It shows the product shape during the pressing process. 1 and 2
The embodiment shown in FIG. 1 is provided with a cylindrical projection of 25.7 mm in length and φ25 mm for forming a base as a neck portion. The method of the present invention also has a great feature that such a neck portion can be easily formed. is there. In addition, there is a case where a long neck portion as shown in FIG. 2 is not provided, and a mouthpiece made of resin used for a PET bottle is joined to a relatively short neck portion.

The product shape of the embodiment is shown in FIG. 6 Pressed part after molding of the shoulder part (body finished)]
The upper part of the can body is characterized by having a smooth and fashionable shoulder part which is connected to the cylindrical part of the neck part having a radius of R70 mm protruding outside the can body and a following inner convexity R25 mm and φ25 mm, and a neck part.

The can body can be provided with a screw cap for resealing, and the fashionable shoulder portion has a small angle with the can body portion.
Also, since the diameter reduction ratio from the can body diameter to the neck diameter is about 60%, which is much larger than the diameter reduction ratio (about 10%) for attaching an EOE lid to a beer can or the like, a beer can, etc. In the necked-in molding method, wrinkles and cracks occur and molding cannot be performed. Further, as shown in FIG. 2 of the present embodiment, when a long neck portion for providing a base portion is further protruded at the tip end, more severe molding conditions are required.

Hereinafter, the embodiment shown in FIGS. 1 and 2 will be described in detail. The material may be any of tinplate, TFS, aluminum plate, or a laminate plate obtained by coating them with resin, which is used as a beverage can. When a steel sheet is used, a high r-value soft or soft material subjected to temper rolling of 5 to 20% (for example, a fine grain with a complex addition of Nb-Ti and a high r-value and a soft steel sheet) is used. It is a preferable material because it has less wrinkles and has good moldability, so that the number of steps for molding the shoulder portion and the neck portion can be reduced. When a laminate plate is used, it is preferable to improve the adhesiveness of the laminate, and it is preferable to perform a heat treatment before or during molding to improve or restore the adhesiveness. In the embodiment of FIGS. 1 and 2, the temper rolling was performed on a steel sheet continuously annealed (CAL) of Nb-Ti added ultra-low carbon steel by 1.2%, and TFS was performed.
Plating, 30-μm PET resin on both sides are laminated by T-die method (method of extruding molten resin into a molten film through a resin extrusion nozzle port arranged in a T-shape on a steel strip to form a laminate), and then subject it to a test. did.

In FIG. Up to three squeezes (post-pressed products), DI (Drow & Ironi)
ng) Molding, DTR (Drow & Thin Redrow) molding or D
Conventional methods such as RD (Drow & Redrow) molding are sufficient and there is no particular limitation. However, in the DI molding method, it is necessary to reduce the ironing rate of the portion where the shoulder portion is formed in the subsequent process, so that the sheet thickness becomes too thin and no wrinkles occur.

No. 4 stops, the tip shape of the punch,
As shown in FIG. 1, the shape of a part of the shoulder portion (a
The method may be the same as the conventional method except that the profile is R70. In addition, No. The conventional method is used for up to 4 stops, and one additional stroke is added to No. 4 in FIG. After pressing, the shape of the pressed product may be formed, but this results in waste of cost.

The molding of the shoulder portion is performed according to the No. 1 of the present invention shown in FIG. 1 to No. The process was carried out in the same manner as in the case of forming a shoulder portion, and a bottle-shaped can body having a fashionable shoulder and a neck portion which were targeted without wrinkles and cracks could be formed.

The advantages of the molding method of the present invention are as follows: The following description focuses on an example of the three-shoulder forming process. No. No. 3 shoulder molding was performed as shown in FIG. No. 2 shown in FIG. No. 3 is set as shown in the explanatory diagram (left half) of the mold for forming the shoulder portion, and as shown in the right half of the figure, pressed with pressure P from above. By performing re-drawing to the stroke position where the formation of the shoulder portion 3 is completed, wrinkles and cracks in the shoulder portion are not generated, and the No. 3 in FIG. After the formation of the three shoulders, the shoulders of the pressed product can be formed.

The points of the shoulder molding method of the present invention are as follows: (a) A can body having a shoulder top shoulder shape of a shoulder profile to be dividedly molded in the process (FIG. 2) No. 2 to No. 5 of the can top profile b, c, d,
e, f 'and Nos. in the left half of FIG. (2) a die having a die surface shape of a profile for forming a shoulder portion by split molding in the molding process (shown in a can top profile c of a pressed product after molding a shoulder portion (die shoulder profile c in FIG. 3)). ) And wrinkle holding (the wrinkle holding tip shoulder profile c in FIG. 3), and re-drawing is performed by a re-drawing forming method (a forming method shown as an example in FIG. 3) with a point of suppressing generation of wrinkles. The shoulder portion of the profile already formed by division (N in FIG. 2)
o. 4 and a. 1 to No. 5 Can top profile a, a
+ B, a + b + c, a + b + c + d, a + b + c + d +
e and No. 5 in the left half of FIG. 2 Shoulder profile (No. 2 to No. 5 in FIG. 2) of the pressed product after the shoulder portion is molded in the shoulder section profile (shown in the shoulder profile (a + b) of the pressed product after the shoulder portion molding) Profile b, c, d, e, f 'and No. 2 shoulder portion in the left half of FIG. And (c) forming a can top portion in advance with a punch die (punch shoulder profile d in FIG. 3) having a shoulder shoulder shape of a shoulder portion profile to be further formed in the next step. (A) & (b) or molding with a combination of (b) & (c).

Hereinafter, No. The formation of the 4, 5, and 6 shoulder portions was carried out in the same manner, and the bottle-shaped can body having the targeted fashionable shoulder portion could be formed without generation of wrinkles and cracks.

(Embodiment 2) The embodiment 2 relates to a molding method according to the third aspect of the present invention, wherein the multi-stage redrawing of the shoulder portion is carried out in such a manner that the profile of each stage is easily formed by approximating the shoulder portion profile. This is an example of "a method for forming a bottle-shaped metal container can body, characterized in that after performing multi-stage re-drawing, a desired body-to-shoulder profile is finished by restriking.

In the molding of this embodiment, the shape of the final molded product is the same as that of the first embodiment shown in FIG. 6 After forming the shoulder portion, the shape is the same as that of the pressed product (body finished product), and the molding method and the basic structure of the mold are the same as those in Example 1. However, the shoulder shape to be molded in each step is a straight line approximate to R70 to R25. That is, the shape is an approximate cone, and the risk of wrinkles and cracks is reduced because of the approximate cone shape. It consists of a total of five steps.

As a result of molding using the same material as in Example 1 in such a molding method, the shoulder portion molding process was performed in a range of 6 to 5
A simple and simple mold shape was obtained with a small number of steps, and the effect of reducing the mold cost and improving the productivity was obtained.

(Embodiment 3) In Embodiment 3, a cylindrical can body finished product prototyped in Embodiment 1 is used as a test material, and a bulging mold having a pair of inner and outer dies in a square rectangular tube shape is used from the inside. Bulging and compression molding were performed from the outside, and a prototype of a square-bottle-shaped bottle-shaped can including the shoulder portion was prototyped to obtain a can body having a predetermined shape.

The can bodies prototyped in the above Examples 1, 2 and 3 were subjected to a die-forming process by roll-form molding at a portion corresponding to the die, a resin cap was attached, the can bottom was closed with a can bottom lid, and a bottle-shaped can was prepared. Was prototyped. In addition, the base is adhered to the can body having a shoulder formed by the present molding method from the resin base used in the PET bottle (having only the attachment part of the resin base) by various bonding methods. Even so, the object of the present invention can be sufficiently achieved.

(Embodiment 4) FIGS. 4 and 5 show an embodiment of the present invention in which a "shoulder portion, a neck portion, a sealing portion for closing with a crown, and a neck portion for ensuring sealing properties are long. Forming a Bottle-shaped Metal Container Can Body with a Cylindrical Projection of about 51.5 mm and a Diameter of about 26.4 mm ”in each press process. 4 and 5
In the embodiment shown in FIG. 7, a shoulder portion, a neck portion, and a sealing portion for sealing with a crown and a neck portion for ensuring sealing property are approximately 51.5 mm in length and approximately φ26.4 mm.
In the first to sixth processes of the present invention having a cylindrical projection, a curling process (seventh process) for securing the sealability and an outer diameter of the neck portion of the curl lower portion for sealing with a crown by roll forming are performed. This is an example in which an eighth step of reducing the diameter by 2.2 mm is added.

In the embodiment shown in FIGS. 4 and 5, a cold rolled steel sheet having a thickness of 0.25 mm is produced by subjecting a steel sheet obtained by continuously annealing (CAL) Nb-Ti-added ultra-low carbon steel to 1.2% temper rolling. And TF
S-plated, 30-μm PET resin on both sides made by T-die method (method of extruding the molten resin into a molten film from a resin extrusion nozzle port arranged in a T-shape on a steel strip and laminating). And the test material.

The press molding was performed under the conditions shown in FIGS. In the present embodiment, the product shape shown in FIG. 4 was press-formed in the first drawing process to the third drawing process in the third drawing process to obtain the product shape in the third process in the drawing. The fourth drawing is a method of the present invention in which the shoulder R of the punch is formed into a punch shape incorporating the shoulder shape R25 (A-part in the figure) of the finished product. Was manufactured.
In addition, No. The conventional method is used for up to 4 stops, and one additional stroke is added. After pressing, the shape of the pressed product may be formed, but this results in waste of cost. Also, the shape of the tip of the punch is not the same as the shoulder shape of the finished product, and the shoulder shape is good even if it is similar to the shoulder portion of the product shape as shown in the first shoulder molded product diagram of the fifth process. When the wrinkle holding shape and the die shape in the next process are formed by the method of forming a shoulder portion for dividing and shaping the product shape of the present invention, a finished product having a target shoulder shape is obtained.

In the shoulder molding, the molding of the fifth and sixth strokes is carried out according to the shoulder molding procedure of the sixth stroke of the present invention shown in FIG. 6, and the desired fashionable shoulder portion without wrinkles and cracks is generated. A can body having a shape was formed.

The features of the molding method of the present invention will be described below with reference to the example of the shoulder molding process shown in FIG. In the molding, the pressed product after the first shoulder molding shown in FIG. 5 is set as shown in a shoulder molding die set explanatory diagram (left half) shown in FIG. 6, and applied from above as shown in the right half of FIG. By press-pressing at a pressure P and performing re-drawing to a stroke position where the formation of the shoulder portion is completed, it is possible to perform the shoulder molding of the pressed product after the shoulder molding of FIG. 5 without occurrence of wrinkles and cracks in the shoulder portion. I can do it.

From the seventh step onward, the procedure for forming the crown cap is described. In the 7th process, about 1.2 in the mouth of about φ5mm
The curling of the winding was performed by a die forming method, and in the eighth step, the neck portion below the curled portion was reduced by about 2.2 mm in outer diameter by roll forming to prepare a bottle-type beverage can sealed with a crown. The neck, curling, and diameter reduction of the top of the can body can be made without wrinkles and cracks, and a bottle-shaped beverage can body for crown sealing with a mouthpiece with a targeted fashionable shoulder portion is formed. Created.

[0030]

According to the method of the present invention, a problem to be solved by the present invention is that in a bottle-shaped metal container can body in which a can body and a shoulder portion projecting upward from the can are integrated, To provide a method of forming the profile of the shoulder part protruding from the surface without wrinkling ", and to give the resealability, which is the recent preference, to a metal container with excellent recyclability. The economic value is extremely large.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a product shape in each press process of "Molding a bottle-shaped metal container can body in which a can body and a shoulder portion projecting upward from a can are integrated" in Example 1 of the present invention. In blanking ~ No. Shows up to the press product process after 4 drawing.

FIG. 2 is a diagram showing No. 2 following FIG. No. 1 Pressed product after molding the shoulder part It shows the product shape from the formation of the six shoulders to the pressing process.

FIG. 3 is a cross-sectional view showing a molded article of No. 3 shown in FIG. 3 shows a three-shoulder part forming mold set.

FIG. 4 shows the product shape of each press process of “Molding a bottle-shaped metal container can for crown closure” in Example 4 of the present invention, in which the first process is cut and drawn to the fourth process and the fourth process is drawn. Up to

FIG. 5 shows a product shape from the first shoulder molding in a fifth stroke to the diameter reduction in an eighth stroke following FIG. 4;

FIG. 6 is a diagram showing No. 6 in the sixth step shown in FIG. No. 2 for molding the shoulder portion. Fig. 2 shows a two-shoulder part molding die set.

Claims (4)

[Claims] 1. A method of forming a bottle-shaped beverage metal can in which a can body and a shoulder and a neck part projecting upward from the center of the can body are integrated, a multistage redrawing (DRD: Drow &
Redrow or DTR: Drow & Thin Redrow) or D
In forming a cylindrical can by the I (Drow & Ironing) process, when forming the protruding shoulder portion in multi-stage split molding, (a) use a can body having a shoulder shape of a can top at the shoulder portion profile to be divided and formed in the process. (B) a redraw forming method in which a dice having a profile of a shoulder portion to be dividedly formed in the forming step and a die having a wrinkle holding surface shape are sandwiched by a wrinkle holder to suppress generation of wrinkles. Perform re-drawing, and add the shoulder profile to be divided and formed in the process to the shoulder part of the profile that has already been divided and formed (in the case of the first division molding, at a predetermined height of the can body). (C) Preforming the top of the can with a punch shoulder-shaped punch having a shoulder profile to be formed separately in the next process And that should at least (a) & (b) or (b) &
(C) A method for forming a bottle-shaped metal container can body characterized by satisfying the conditions. 2. The molding method according to claim 1, wherein
The condition of (a) is that (a) a can body having a can top shoulder shape having a profile similar to the shoulder portion profile to be divided and formed in the process is used; (c) the condition is (c)
A method for forming a bottle-shaped metal container can body, wherein the top of the can is formed in advance using a punch having a shoulder-like shape having a profile similar to the shoulder portion profile to be separately formed in the next step. 3. The molding method according to claim 1, wherein, in the multistage redrawing of the shoulder and the neck, the multistage redrawing is performed by using a profile which is easy to mold and is similar to the shoulder portion profile. And forming the desired body-shoulder and neck profiles by restriking. 4. The molding method according to any one of claims 1 to 3, wherein the metal container can body formed by each of the methods further comprises a square, hexagon, ellipse, etc. including the body. A method for forming a non-cylindrical bottle-shaped metal container can body, characterized in that: