JP4016710B2 - Container manufacturing apparatus and manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container manufacturing apparatus and a manufacturing method for performing neck-in processing on an upper end portion of an intermediate container that is formed in a cylindrical shape with a bottom in advance.
[0002]
[Prior art]
Conventionally, spinning processing and neck-in processing are widely known as processing methods for drawing the upper end portion of the intermediate container formed in a bottomed cylindrical shape.
In the spinning process, the intermediate container is rotated and the upper end of the container is heated and the upper end is forcibly pressed by a roll or the like to form a drawn shape.
[0003]
On the other hand, in the neck-in processing, a tapered neck-in mold having a constant inclination angle is crowned on the upper end of the intermediate container and pushed in with a constant load, and a constant inclination angle is applied to the upper end portion of the intermediate container. The taper is formed.
[0004]
[Problems to be solved by the invention]
Containers to be processed have wall thicknesses that are thin, such as cans for beverages, and walls that are used to store materials in various industries. Some are thick.
[0005]
When the drawing shape is formed at the upper end of the thick-walled container by the spinning process, it is necessary to apply high heat and a high load to the upper end. There was a problem that the shoulder bulges. In this case, when the contents contained in the container as a product are taken out of the container, the contents accumulate in the bulging portion, so that there is a problem that good contents dischargeability cannot be secured.
[0006]
On the other hand, when forming the drawn shape at the upper end of the thick container by neck-in processing, there is a problem that the container is heavily loaded and the body of the container is buckled. Measures such as arranging were necessary.
[0007]
However, there is a problem that it is difficult to remove the core after the neck-in processing is finished because the thick container is formed in a bottomed cylindrical shape and the upper end portion is a drawn shape. It was. Therefore, in order to facilitate the removal of the core, it is conceivable to divide the core into as many as possible. In this case, the structure of the container manufacturing apparatus becomes complicated, and the manufacture of the apparatus is difficult. In addition to incurring high costs, there is a problem that it is difficult to manufacture a highly accurate core.
[0008]
As described above, since it is difficult to produce the thick container having a tapered shape at the upper end of the container by neck-in processing, it is common to produce a container having the shape by cutting. However, in this case, there is a problem that production man-hours are required and the cost of the container becomes high.
[0009]
The present invention has been made in consideration of such circumstances, and a highly versatile container manufacturing apparatus capable of forming a tapered drawn shape at the upper end of a thick-walled container with high efficiency and low cost. It is intended to provide.
[0010]
[Means for Solving the Problems]
In order to solve the above problems and achieve such an object, the present invention proposes the following means.
The invention according to claim 1 is a container manufacturing apparatus for performing neck-in processing on an upper end portion of an intermediate container formed in advance in a bottomed cylindrical shape, wherein the upper end portion of the intermediate container is narrowed from its periphery. A core that is inserted from the upper end portion into the intermediate container and contacts the inner surface of the container and forms a neck-in process together with the neck-in mold, a pin, and a holding plate that supports the core provided, said core, said upper portion Ri Do a plurality of frames which are divided with respect to removably its axis to each other from a width narrower respect of which at least one of a direction away from the axis of the container between the intermediate It is formed, has an opening that extends in the axial direction and opens upward, and a flange that comes into contact with the holding plate, and the pin is fitted into the opening. And
[0011]
According to the manufacturing apparatus according to the present invention, when the tapered drawing shape is formed on the upper end portion of the thick container by neck-in processing, the core receives a load acting on the container. Stable production is possible without buckling of the body of the container. Furthermore, after the neck-in process, it becomes possible to remove the pieces constituting the core separately from the upper end of the container, so that efficient production of the thick container having a base at the upper end of the container Can be realized.
[0013]
Further , according to the manufacturing apparatus of the present invention, it is possible to easily remove the core after neck-in processing at low cost and without impairing the production accuracy of the core.
[0014]
The invention according to claim 2 is a container manufacturing method in which a neck-in process is performed on an upper end portion of an intermediate container formed in advance in a bottomed cylindrical shape, and the neck-in process is performed from around the upper end portion of the intermediate container. A neck-in mold for narrowing down and a core arranged inside the container, the core is composed of a plurality of pieces divided in the circumferential direction so as to be individually removable from the upper end portion , And at least one of the pieces is formed to be movable in the center direction, and has an opening that extends in the axial direction and opens upward, and a flange that abuts on a holding plate that supports the core. A pin is inserted into the opening, and after the neck-in process is completed, the pin is taken out, and then the piece that is movable in the central direction is moved in the central direction and taken out from the upper end. , sequentially other pieces to each other And wherein the issue.
[0015]
According to the manufacturing method according to the present invention, after the neck-in processing on the upper end portion, the pieces constituting the core can be easily detached from the upper end portion of the container, and the base portion is formed on the upper end portion of the container. Efficient production of the thick-walled container having the above can be realized.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a container manufacturing apparatus shown as an embodiment of the present invention.
This container manufacturing apparatus first hot-extrusion forges the billet-processed metal to form a bottomed cylindrical intermediate container, then installs the intermediate container in the container manufacturing apparatus, and necks the upper end of the intermediate container. A base is formed on the upper end by in-processing.
[0017]
The main part of the container manufacturing apparatus according to the present invention shown in FIG. 1 includes a neck-in mold part 2, a base plate part 3 and an upper base mold part 4. The neck-in mold part 2 is installed on the upper surface of the base plate part 3, and the upper base mold part 4 is arranged above the mold part 2.
The neck-in mold part 2 includes a neck-in mold 5, a core 6 and a guide shaft part 7, and an intermediate container 1 is disposed inside the mold part 2.
[0018]
Further, details of the neck-in mold part 2 will be described.
FIG. 2 shows a main part of the neck-in mold part 2. A support column part 21 is provided at the upper end of the base 20, and a holding plate 24 is arranged at the upper end.
[0019]
A space 26 is formed inside the base 20, and the body portion 41 of the intermediate container 1 is arranged in the space 26 so that the center thereof coincides with the axis O of the container manufacturing apparatus.
In addition, a space 27 is formed inside the support column portion 21, and the neck-in mold 5, the upper end portion 40 of the intermediate container 1, and the core 6 are respectively centered on the axis O in the space 27. It is arranged to match.
[0020]
The holding plate 24 is formed with a large-diameter opening 50 at the center thereof, and a plurality of through holes 51 are formed around the opening 50.
The main wall portion 12 of the core 6 is fitted into the opening 50, and the lower surface of the flange portion 13 of the core 6 is in contact with the upper surface of the holding plate 24.
The shaft of the guide shaft portion 7 is inserted into the through hole 51, and the through hole 51 is formed when the upper base mold portion 4 pushes the guide shaft portion 7 and the shaft portion 7 is lowered as shown in FIG. 1. Serves as a guide.
[0021]
The neck-in mold 5 is disposed above the outer upper end opening 42 of the intermediate container 1 in the space 27, and moves downward in the figure when neck-in processing is performed.
The neck-in mold 5 is formed with a circular opening 30 in the center for inserting the core 6 into the neck-in mold 5 and performing neck-in processing on the upper end 40 of the intermediate container 1. Yes. Further, the opening 30 is formed with a tapered surface 31 that gradually increases in diameter continuously below the opening 30, and a large-diameter portion 32 that is continuous with the tapered surface 31.
Under this configuration, the tapered surface 31 abuts on and presses against the upper end portion 40 of the intermediate container 1 and is plastically deformed to form the base portion 45 and the shoulder portion 44 in the container 1.
[0022]
The core 6 shown in FIGS. 3 and 4 receives a load acting on the intermediate container 1 during neck-in processing, and prevents the body portion 41 of the intermediate container 1 from buckling. The upper end flange portion 13, the main wall portion 12, the auxiliary wall portion 11, and the lower end pressing portion 10 are configured.
[0023]
The core 6 is inserted and arranged downward from above the holding plate 24 shown in FIG. 1 through the opening 50, and its lower end is located inside the upper end portion 40 of the intermediate container 1. That is, in this case, the side surface 15 of the presser portion 10 of the core 6 is in contact with the inner surface of the shoulder portion 44 of the intermediate container 1, and the sub-wall portion 11 is in contact with the inner surface of the base portion 45 of the container 1.
[0024]
The presser portion 10 is formed in a substantially conical shape that matches a predetermined throttle shape to be applied to the upper end portion 40 of the intermediate container 1. An opening 8 is formed in the center of the core 6 in the direction of the axis O.
The sub-wall portion 11 is formed with a curved surface 14 that gradually decreases in diameter continuously below the main wall portion 12, thereby accurately obtaining the dimensional accuracy of the container upper end portion 40 and the inner upper end opening 43. Is configured to be curved.
[0025]
The core 6 is composed of pieces 6A, 6B, 6C, and 6D that are divided into a plurality (12 divisions in this embodiment) around the axis O.
The piece 6A has a relationship in which the outer peripheral surface length L1 is smaller than the inner peripheral surface length L2.
The piece 6B has a relationship in which the outer circumferential surface length L3 is smaller than the gap formed on the inner circumferential surface 60 of the opening 8 when two pieces 6A are removed.
[0026]
The lengths of the outer peripheral surfaces of the other pieces 6C and 6D are smaller than the gap formed on the inner peripheral surface 60 when two pieces 6A and 6B are removed.
Moreover, the internal diameter of the opening part 8 becomes larger than the length of the radial direction of piece 6A, 6B, 6C, 6D.
[0027]
In the core 6 configured in this manner, a pin 9 that is gradually reduced in diameter as it extends downward is inserted into the opening 8. The pin 9 has a function of pushing and expanding the main wall portion 12, sandwiching the main wall portion 12 between the opening portion 50 and the pin 9, and fixing it. Thereby, the malfunction by the core 6 being divided | segmented and divided, ie, prevention of the formation precision reduction of the container by the play of the core 6 at the time of neck-in processing is aimed at.
[0028]
A method of forming a base part by performing neck-in processing on the upper end part 40 of the intermediate container 1 using the container manufacturing apparatus configured as described above will be described.
The guide shaft portion 7 descends when the upper base mold portion 4 descends and comes into contact with the guide shaft portion 7. At this time, since the neck-in mold 5 is connected to the guide shaft portion 7, it is lowered at the same time. At this time, the neck-in mold 5 comes into contact with the outer upper end opening 42 of the intermediate container 1 and descends until the inner surface of the upper end 40 of the intermediate container 1 comes into contact with the core 6. Push in. Thereby, the upper end portion 40 is plastically deformed to form the base portion 45 and the shoulder portion 44.
[0029]
First, the neck-in mold 5 uses a large-diameter opening 30 and sequentially changes to a small-diameter, and the upper end portion 40 of the container 1 is squeezed in stages to obtain a final product. To do.
In addition, FIG. 2 has shown what the neck-in metal mold | die 5 used for the last process is arrange | positioned.
[0030]
Here, after the neck-in process, the completed container has a bottomed cylindrical shape, and the upper end portion 40 is squeezed and reduced in diameter, and the outer diameter of the presser portion 10 of the core 6 is The relationship is larger than the diameter of the inner upper end opening 43.
[0031]
In order to remove the core 6 from the container in this state, first, the pin 9 is removed, and then the piece 6A formed so that the outer peripheral surface length L1 is smaller than the inner peripheral surface length L2. Move to the center. Here, all the pieces 6A, 6B, 6C, 6D constituting the core 6 are formed so that the radial dimensions are smaller than the diameter of the opening 8, so that the piece 6A can be removed. It becomes possible. Thereby, a gap is formed on the inner peripheral surface 60 of the opening 8.
Further, the piece 6B formed so as to have the outer peripheral surface length L3 smaller than the gap is removed. The gap formed thereby is formed in a relationship that is larger than the pieces 6C and 6D, and all the pieces 6A, 6B, 6C, and 6D can be removed.
[0032]
Thereby, according to the container manufacturing method by the configured container manufacturing apparatus, the neck portion 41 of the intermediate container 1 is caused to buckle when the upper end portion 40 of the thick intermediate container 1 is subjected to neck-in processing. Therefore, it is possible to form the base portion at the upper end portion 40 without removing the core portion 6 from the container after forming the base portion. Neck-in processing can be realized.
[0033]
Accordingly, a thick container having a cap portion having a tapered upper end portion 40 can be efficiently formed by neck-in processing, so that workability when taking out the contents of the container can be improved. The container can be provided at low cost.
[0034]
In the present embodiment, the outer peripheral surface length L1 of the piece 6A is formed so as to be larger than the inner peripheral surface length L2. However, even if the dimensions of the L1 and L2 are the same, the function is particularly important. No problem.
[0035]
【The invention's effect】
As is clear from the above description, according to the present invention, when performing neck-in processing on the upper end of the thick, bottomed cylindrical intermediate container, without causing buckling of the body of the container, A tapered base portion can be formed at the upper end portion. Furthermore, since the core can be easily removed after the neck-in process, the base portion can be efficiently formed at the upper end portion of the container.
As a result, it is possible to provide a container capable of improving workability when taking out the contents at a low cost.
[Brief description of the drawings]
FIG. 1 is an overall front view of a container manufacturing apparatus shown as an embodiment of the present invention.
FIG. 2 is an enlarged front cross-sectional view of the neck-in mold part of the embodiment shown in FIG.
FIG. 3 is a plan view of the core of the embodiment shown in FIG. 1;
FIG. 4 is a side sectional view of the core shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intermediate container 2 Neck-in mold part 3 Base plate part 4 Upper base part 5 Neck-in mold 6 Core 6A, 6B, 6C, 6D Piece 15 Core presser part 40 Upper end part O Center axis

Claims (2)

A container manufacturing apparatus that performs neck-in processing on an upper end portion of an intermediate container that is formed in a bottomed cylindrical shape in advance,
A neck-in mold that narrows the upper end of the intermediate container from its periphery, and a neck-in process that is inserted and arranged in the intermediate container from the upper end to make contact with the inner surface of the container and perform the neck-in processing together with the neck-in mold A child, a pin, and a holding plate that supports the core ;
Said core, said upper portion Ri Do a plurality of frames which are divided with respect to removably its axis to each other from a width formed in a narrow respect of which at least one of a direction away from the axis of the container between the intermediate And an opening that extends in the axial direction and opens upward, and a flange that contacts the holding plate,
The container manufacturing apparatus , wherein the pin is fitted into the opening . A container manufacturing method for performing neck-in processing on an upper end portion of an intermediate container formed in a bottomed cylindrical shape in advance,
The neck-in processing is performed by a neck-in mold that narrows down from the periphery of the upper end of the intermediate container, and a core disposed inside the container,
The core is composed of a plurality of frames which are divided into removably circumferential direction to each other from the upper end portion, while being movably formed toward the center at least one of the plurality of frames, the axial An opening that extends upward and opens upward, and a flange that abuts a holding plate that supports the core, and a pin is inserted into the opening.
After completion of neck-in processing, after taking out the pin, the piece made movable in the central direction is moved in the central direction, taken out from the upper end portion, and then the other pieces are taken out one by one. Container manufacturing method.

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