JPH0636950B2 - Method for manufacturing net quin processing container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a container in which a container lid is wound around a container body to close the lid, and a neck-in process is performed.

(Prior Art) Conventionally, as shown in FIG. 4, the container body (2) is fitted with the container lid (1) and subjected to a winding process to form a double winding portion (24), and then the lid is closed. A container in which the neck-in portion (23) is formed by subjecting the container body (2) to neck-in processing is known.

In recent years, it has become necessary to stack such containers at the time of storage or when they are displayed as products in stores.

As a container suitable for such stacking, the outer diameter of the double winding part (24) above the container provided with the neck-in part (23)
When R ₃ is formed to have a smaller diameter than the inner diameter R _{4 of} the bottom lid (28) fitted below the body (2) of the vessel, and when stacked, the bottom lid (28) of the upper vessel is filled with the vessel lid ( It is necessary to be able to insert 1).

On the other hand, the applicant of the present invention has proposed a method for producing a container which has been subjected to neck-in processing by a conventional double winding device as seen in JP-A-58-35027. That is, as shown in FIG. 5A, a metallic container lid b having an outer diameter smaller than the inner diameter of the metallic container barrel a is fitted onto the container barrel a, and the inner diameter of the chuck wall portion c of the container lid b is adjusted. The matching seaming rotary chuck d is mounted, and the seaming roll e is pressed to the side of the seaming rotary chuck d to perform the tightening process.
As shown, the container body a is pressed and deformed toward the chuck wall portion c to form the neck-in portion f, and the double winding portion g
Is a method of forming.

However, the outer peripheral surface h of the seaming rotary chuck d used in the above method is in contact with the chuck wall portion c of the container lid b.
As shown in FIG. 5C, has an angle i with respect to the vertical direction of about 4 degrees and has a tapered surface extending from the lower side to the upper side. Then, while the seaming roll e is pressed with a strong force, the inner peripheral surface of the chuck wall portion c of the container lid b and the outer peripheral surface h of the seaming rotary chuck d coincide with each other and have the same angle. When the mingling roll e is separated, spring back occurs in the double winding portion g of the container lid b, and the double winding portion g is in contact with the outer peripheral surface h of the seaming rotary chuck d.
Expands outward. Also, the neck-in portion f formed on the container body a by the pressing deformation of the jaw k provided below the seaming groove j of the seaming roll e also has the double winding portion g when the seaming roll e is separated. Springback occurs and spreads outward as in. Therefore, even if the outer diameter r of the double winding portion g is set to a predetermined size so that the containers can be stacked in advance, the spring back generated in the double winding portion g and the neck-in portion f when the seaming roll e is released. The outer diameter r of the double winding part g
Variation occurs.

As a result, there is a problem that a container e that cannot be stacked is manufactured.

(Problems to be Solved by the Invention) The present invention solves the problems of the above-mentioned conventional methods, and can reduce outward expansion even if springback occurs in the neck-in portion and the double winding fastening portion, An object of the present invention is to provide a method for manufacturing a neck-in processed container having stable stacking.

(Means for Solving Problems) The present invention has been made to solve the above-mentioned problems, and the outer diameter of the chuck wall portion connected to the panel portion is smaller than the inner diameter of the container body. A method of forming a neck-in part and a double winding part by fitting the container lid fitted into an opening of a container body provided with a flange part and by a first winding process and a second winding process, A seaming rotary chuck having a peripheral surface which is continuous with a concave portion provided in the vicinity of the lower edge over the entire circumference in the circumferential direction and has a tapered surface with an inclination angle of 2 degrees or less with respect to the vertical is provided in the chuck wall portion of the container lid. After mounting, the first seaming roll is pressed by the seaming rotation chuck side to pass through the seaming panel part and the seaming wall part that are connected to the upper end of the chuck wall part by the seaming roll groove. The first hooking step of preliminarily tightening by pressing and deforming the hanging end hook part and the flange part, and performing the preliminary neck-in processing on the container body, and the recess of the seaming rotary chuck at the time of final tightening. The end hook portion and the flange preliminarily tightened in the first tightening step by the pressing of the second seaming roll having the jaw protruding below the seaming roll groove corresponding to the position While pressing the jaw part against the chuck wall part, the jaw part is pressed against the concave part of the seaming rotary chuck by final winding to preliminarily neck-in the container body while pressing it against the chuck wall part. To form a neck-in portion, and the outer diameter of the double winding portion is made smaller by the inner diameter of the bottom lid fitted below the container body, and Second winding forming a bent portion that is recessed inward in the chuck wall radius portion located below the back wall portion, and a bent portion that is recessed inward at the upper end of the neck-in portion corresponding to this bent portion And a tightening process.

EXAMPLES The present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.

(1) in Fig. 1 is a container lid made of thin metal plate material such as tein-free steel, aluminum, tin plate,
(2) shows a container body made of the metal thin plate material.

In the container lid (1) used in the present invention, the outer diameter R ₁ of the chuck wall portion (4) connected to the entire peripheral edge of the panel portion (3) is formed to be smaller than the inner diameter R ₂ of the container body (2) and is recessed. The chuck wall portion (4) is provided with an end hook portion (7) which hangs through the seaming panel portion (5) and the seaming wall portion (6) which are continuous with the upper end of the chuck wall portion (4). Further, the container body (2) is provided with a flange portion (9) bent outwardly at the edge of the opening (8).

2A and 2B show the main part of the manufacturing apparatus used for the container lid winding processing of the present invention.
0) is a seaming rotary chuck, which is shown in FIG. 2B.
(11) is the second seaming roll.

The seaming rotary chuck (10) has a concave portion (12) in the vicinity of its lower edge over the entire circumference in the circumferential direction, and rises continuously with the concave portion (12), and has an inclination angle θ of 2 degrees or less with respect to the vertical. And a peripheral surface (13) which is a tapered surface. The second seaming roll (11) is provided with a jaw (15) protruding below the seaming roll groove (14) corresponding to the recessed position of the seaming rotary chuck (10) at the final winding.

FIGS. 3A to 3D show a manufacturing process of double winding the container lid of the present invention. First, the container lid (1) is fitted onto the container body (2) as shown in FIG. 1, and in this state, the seaming rotation is performed in the chuck wall part (4) of the container lid (1) as shown in FIG. 3A. The chuck (10) is mounted, while the bottom of the container body (2) is supported by a lifter (not shown) so as to be able to move up and down. When the first seaming roll (16) is pressed from the side toward the seaming rotary chuck (10) side, the first seaming roll (1)
The contact surface (17) of 6) is the seaming wall part (6) of the container lid (1).
Also, a force is applied to the outer surface of the end hook portion (7) to push it downward, so that both portions (6) and (7) move to the first seaming roll (1
When it is wound along the seaming roll groove (18) in (6), it deforms inward and sandwiches the flange (9) of the container body (2) with both parts (6) (7). It becomes a state of being caught. Then, as shown in FIG. 3B, the winding process is further advanced, and the seaming roll groove (18) of the first seaming roll (16) and the jaw portion (19) are pressed to push the container lid (1). Pre-tightening to deform the end hook part (7) and the flange part (9) of the container body (2) inward, and to deform the outer surface of the container body (2) near the opening (8) and neck part (20) 2) was performed as a first necking step of double-tightening.

Then, as shown in FIG. 3C, the second seaming roll (1
1) advances the winding process, and by the seaming roll groove (14), the end hook portion (7) of the container lid (1) pre-wound in the first winding process and the container body (2). While further tightening the flange portion (9), the chuck wall portion (4) of the container lid (1) is placed along the outer peripheral surface (13) of the seaming rotary chuck (10). At this time, seaming rotary chuck (10)
A gap (21) is formed between the recess (12) and the recess (12) without the chuck wall portion (4) extending along the recess.

Then, as shown in FIG. 3D, the second seaming roll (1
The upper part (22) of the neck part (20) of the container body (2) formed by the preliminary neck-in process at the jaw part (15) of the chuck wall part (4) of the container lid (1) ), Press it into the recess (12) through the gap (21) and
The neck-in part (23) is formed in (2), the double winding part (24) is completed by the seaming roll groove (14), and the seaming rotary chuck is formed by the jaw part (15).
A bent portion (26) that is recessed inwardly pushed toward the recessed portion (12) in the chuck wall radius portion (25) located below the chuck wall portion (4) pressed to the (10) side, The second winding step was performed by forming a bent portion (27) which is recessed inward at the upper end of the neck-in portion (23) so as to correspond to the bent portion (26).

In the above steps, the neck-in portion (23) is provided on the container body (2) as shown in FIG. 4 and the double winding portion (24) provided on the container lid (1).
A container having an outer diameter R ₃ of smaller than the inner diameter R _{4 of} the bottom lid (28) fitted below the container body (2) is manufactured.

When this is done, a chuck wall radius portion (25) having a bent portion (26) recessed inward is formed below the chuck wall portion (4) of the container lid (1), and the container body (2) is formed. Formed at the upper end of the neck-in part (23) of this is a bent part (27) which is recessed corresponding to this bent part (26), and also the chuck wall part (4)
Since the inclination angle with respect to the vertical is formed to be 1/2 or less compared to the conventional one, the double winding part (24) can be formed on the inside of the container as a whole, and the container body is pre-necked.
Since the upper part (22) of the neck part (20) of (2) can be pressed against the chuck wall part (4), the double winding part (24)
The outer diameter R ₃ of can be made constant.

Therefore, even if springback occurs in the double tightening portion (24) and the neck-in portion (23), outward expansion can be reduced, so that the outside of the double tightening portion (24) suitable for stacking can be reduced. A neck-in processing container having a diameter R ₃ can be manufactured.

(Effect of the invention) As described above, according to the present invention, in the formation of the neck-in portion and the double winding portion, the vertical rising in succession to the concave portion provided over the entire circumference in the circumferential direction in the vicinity of the lower edge. With respect to the seaming rotary chuck having a tapered peripheral surface with an inclination angle of 2 degrees or less, and a jaw protruding below the seaming roll groove corresponding to the recessed position of the seaming rotary chuck at the time of final winding. Since the second seaming roll provided is used, a chuck wall radius portion having a bent portion that is recessed inward is formed below the chuck wall portion of the container lid, and the bent portion is provided at the upper end of the neck-in portion. Since the bent portion that is recessed is formed and the inclination of the chuck wall portion with respect to the vertical is formed small, the double winding portion can be formed as a whole toward the inner side of the container, The upper part of the neck-in part of the container body above the bent part can be brought into pressure contact with the chuck wall part, and the outer diameter of the double winding part can be made constant. Therefore, even if spring back occurs in the neck-in portion and the double winding portion, the outward expansion can be reduced, and the neck-in processed container having stable stacking can be efficiently manufactured.

[Brief description of drawings]

1 to 4 show one example of the embodiment of the present invention. FIG. 1 is a cross-sectional view showing a state before a winding process, and FIG. 2 shows a main part of an apparatus used for implementing the present invention. Indicate (A)
Is a seaming rotary chuck, (B) is a second seaming roll, FIG. 3 is a diagram for explaining the manufacturing process, and FIG. 4 is a cross section of a neck-in processed container obtained by the manufacturing method of FIG. 5 and 5 are a diagram for explaining a manufacturing process of a conventional example and a cross-sectional view of a main part of a seaming rotating roll used for the diagram. (1) …… Container lid, (2) …… Container barrel, (3) …… Panel section, (4) …… Chuck wall section, (5) …… Seaming panel section, (6) …… Seaming Wall part, (7) …… End hook part, (8) …… Opening part, (9) …… Flange part, (10) …… Seaming rotary chuck, (11) …… Second seaming roll, (12 ) …… Recess, (13) …… Surface, (15) …… Jaw of second seaming roll, (16) …… First seaming roll, (18) …… Seam of first seaming roll Ming roll groove, (23) …… Neck-in part, (24) …… Double winding tightening part, (25) …… Chuck wall radius part, (26) …… Chuck wall radius part bend part, (27) …… Bent part of container case, (28) …… Bottom lid, R ₁ …… Outer diameter of chuck wall part, R ₂ …… Inner diameter of container case, R ₃ …… Outer diameter of double winding part, R ₄ …… Inner diameter of the bottom lid, θ …… Inclination angle.

Claims (1)

[Claims] 1. A container lid in which an outer diameter of a chuck wall portion connected to a panel portion is smaller than an inner diameter of the container body is fitted into an opening of the container body having a flange portion, and a first winding is performed. In the method of forming the neck-in portion and the double winding portion by the step and the second winding step, in the vertical direction, the neck-in portion and the double winding portion are connected to a concave portion provided in the vicinity of the lower edge over the entire circumference in the circumferential direction. A seaming rotary chuck having a tapered peripheral surface with an inclination angle of 2 degrees or less is mounted in the chuck wall portion of the container lid, and the seaming roll groove is pressed by pressing the first seaming roll toward the seaming rotary chuck. When the seaming panel portion connected to the upper end of the chuck wall portion and the end hook portion that hangs down through the seaming wall portion and the flange portion are pressed and deformed, pre-tightening is performed. First, a first tightening step of subjecting the container body to a preliminary neck-in process, and a second step of providing a jaw protruding below the seaming roll groove corresponding to the position of the recess of the seaming rotary chuck during the final winding. By pressing the seaming roll against the seaming rotary chuck, the first
The end hook portion and the flange portion preliminarily wound in the winding step are pressed against the chuck wall portion while being wound, and the jaw portion is finally tightened by pressing the jaw portion to the concave side of the seaming rotary chuck, thereby preliminarily necking in. The processed container body is pressed against the chuck wall and pushed toward the recess to form the neck-in part, and the outer diameter of the double winding part is made smaller by the inner diameter of the bottom lid fitted below the container body. A bent portion that is formed and that is recessed inward in the chuck wall radius portion that is located below the chuck wall portion, and a bent portion that is recessed inward in the upper end of the neck-in portion corresponding to this bent portion. A method of manufacturing a neck-in processed container, which comprises the step of forming a second winding step.