JP4832476B2 - Metal container manufacturing method and metal container manufacturing apparatus - Google Patents

Description

The present invention relates to a method for manufacturing a metal container and a metal container manufacturing apparatus, and more particularly to a method and apparatus for manufacturing a metal container (partially thin-walled container) in which the thickness of the side wall surface of the container is partially reduced.
The term “container” here is not limited as long as it is a bottomed cup-shaped product having a bottom wall and a side wall, and “container” regardless of whether it is a finished product or a semi-finished product. Shall be included. For example, a semi-finished product such as a metal pressure vessel as a final product and a bottomed cylindrical liner which is an intermediate processed product before being processed into a composite container is also included.

Conventionally, metal containers such as aluminum, iron, and stainless steel have been used for pressure vessels filled with high-pressure gas. When manufacturing such a metal container, a cylindrical or square bottomed container is manufactured by drawing (deep drawing) using a plate-like material (blank material) as a workpiece. .
In general, in a drawing process, a plate-like material that is a workpiece is placed on a die in which a drawing hole (called a die hole) is formed. Next, the bottom wall and the side wall are processed by pressing the plate material into the die hole by pressurizing the punch toward the die hole (see Patent Document 1).

When the side walls are elongated, redrawing is performed by first forming the workpiece into a large-diameter cup shape by the first drawing process and then applying the second drawing process to the desired cup shape. Is used (see Patent Document 2).
In the redrawing process, not only the reverse redrawing process that pushes in the direction opposite to the first drawing direction as described in Patent Document 2, but also the forward redrawing process that pushes in the same direction as the first drawing is used. Has been.
The side wall formed by such drawing or redrawing has a constant thickness.

  The metal container is preferably a thick metal container from the viewpoint of the pressure resistance performance of the container, but it is also an important issue to reduce the thickness of the container itself by reducing the thickness. For example, in a fuel cell vehicle, a metal container for storing hydrogen is mounted as a supply source of hydrogen serving as fuel. The metal container for hydrogen storage needs to reduce the weight of the container itself in order to reduce the vehicle weight as well as the pressure resistance.

  When reducing the weight of the metal container, if the entire container is thinned uniformly, the pressure strength cannot be maintained high. Therefore, as shown in FIG. 6, only the thickness of the central portion of the side wall having a small influence on the pressure strength is reduced, and the thickness from the bottom wall of the container to the lower end side of the side wall and in the vicinity of the opening end of the side wall is increased. However, it is required to produce a metal container (partial thin container) in which the thickness of the side wall surface is partially changed.

FIG. 7 shows a processing step when manufacturing a metal container (partial thin container) in which the thickness of the bottom wall, the lower end of the side wall and the vicinity of the side wall opening is thick and the thickness of the central portion of the side wall is partially changed. It is a figure which shows the prior art example. The partially thin container is formed by drawing (deep drawing) and ironing using a special mold.
First, as shown in FIG. 7A, a bottomed container 101 having a short side wall and a sufficiently thick wall is formed by a normal drawing process. Next, as shown in FIG. 7B, the mold 102 provided with a step 102 a at a position corresponding to the thin region is inserted into the inner space of the bottomed container 101. Next, as shown in FIG. 7 (c), the outer surface 103 of the bottomed container 101 is ironed with a roller (not shown), so that the outer surface 103 of the bottomed container 101 is ironed with a roller 104. By performing the processing, the bottomed container 105 in which a part of the side wall is thinned is formed. And the metal mold | die 102 is extracted after completion | finish of a process.
JP 05-305359 A Japanese Patent Laid-Open No. 06-234029

  In the method of manufacturing the bottomed container 101 in which a part of the side wall is thinned by drawing and ironing, it is necessary to finally draw out the mold 102 inserted inside. At that time, the step 102a portion acts as a resistance, so that the drawing operation becomes difficult. Actually, the resistance is suppressed by, for example, tapering the end of the step 102a, but the resistance is not lost. In addition, the resistance increases as the thickness difference of the step 102a increases. If the resistance is large, the thin region of the bottomed container 101 with which the step 102a is in direct contact may be damaged.

In addition, when it is desired to increase the thickness difference between the thick wall region of the side wall and the thin wall region of the side wall adjacent thereto, the thinned region may be broken when trying to process all at once by one ironing process. There is. That is, there is a limit to the wall thickness difference that can be thinned by one ironing process, and it is necessary to gradually reduce the wall thickness by multiple ironing processes, which requires labor and time for processing.

In view of the above, an object of the present invention is to process a metal bottomed container whose side wall is partially thinned with a new manufacturing method and manufacturing apparatus that are unlikely to cause problems such as breakage.
Further, the present invention is to process a metal bottomed container whose side wall is partially thinned with a manufacturing method and a manufacturing apparatus capable of processing in a short time with a simplified process. With the goal.

  Furthermore, when thinning the inner wall side of the side wall, the present invention eliminates the mold drawing operation by inserting the thin wall without inserting the mold into the inner wall side space. For example, as shown in FIG. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus capable of forming a plurality of thin regions on the inner wall side in a rib shape, or forming a thin region in a free range and shape.

The metal container manufacturing method of the present invention, which has been made to solve the above-mentioned problems, includes a die having a die hole for drawing processing, and a drawing processing die that is disposed so as to be movable up and down at a position directly above the die hole. A punch and an upper upset mold that is disposed so as to be movable up and down at an upper position facing the upper surface of the die and that performs upsetting on a workpiece by using the upper surface of the die as a lower upset mold are used.
And the metal container manufacturing method of this invention performs the process of the following (a) and (b) sequentially.
(A) Lower thick region forming step of forming a thick region on the bottom wall and the lower end side of the side wall by drawing processing to reduce the workpiece placed on the die with a punch (b) A part of the die is placed on the upper surface of the die, and the upper upset mold is squeezed down to carry out the upsetting process to reduce the thickness of the processing part (b1), and the upper upset mold is retracted upward. At the same time, when the thinned machining part is pushed into the die hole by pressing the punch, the drawing process of the thinned machining part is advanced, and there are more parts to be thinned at this time. The thin-walled area processing step (b2) in which the part to be thinned for subsequent upsetting is placed on the upper surface of the die is alternately repeated, so that all the parts to be thinned are sequentially processed into thin-walled areas. Region formation process

  That is, first, the lower thick region forming step (a) is performed, and a drawing process is performed in which the workpiece to be processed placed on the die is reduced with a punch. Thereby, a part of the workpiece to be pushed into the die hole forms a thick wall region on the bottom wall and the side wall lower end side. This process is performed until the entire thick wall region on the lower side of the side wall is pushed into the die hole. As a result, the first thinned portion (the portion that becomes the boundary with the thick region) is placed on the upper surface of the die.

  Subsequently, the thin area | region formation process of (b) is performed. Here, first, a part of the side wall to be thinned (the first part to be thinned) is placed on the upper surface of the die (actually, the first part to be thinned at the end of the lower thick region forming step in (a)). Is placed on the top surface of the die). In this state, the upper upset mold is squeezed down and the upsetting process is performed to reduce the thickness of the processed part until a desired thickness is reached (the number of reductions is arbitrarily set according to the thickness). In this way, the thinning step (b1) is performed.

Subsequently, the upper upset mold is retracted upward, and the thinned machining part is pushed into the die hole by the punch down and the thinned machining part is drawn. And expand the side wall. At this time, since the upper upset mold is retracted, the thickness is not reduced. Therefore, a large force that breaks the workpiece is not applied.
Then, if there is a portion to be thinned continuously, place the portion to be thinned next for upsetting on the upper surface of the die (in fact, the portion to be thinned next time is the previous pushing operation. Will be automatically loaded). In this way, the thin region progressing step (b2) is executed.

  Thereafter, the thinning step (b1) and the thinning region progressing step (b2) are alternately repeated, so that all the thinning planned portions are sequentially processed into thinning regions.

Here, the shape of the die hole is generally a cylindrical shape, but may be another shape such as a prismatic shape according to the outer shape of the metal container to be formed.
Moreover, the area | region utilized as a lower upset metal mold | die on the upper surface of the die may be used as a die part itself, or the die body and the accessory part forming the lower upset mold may be fixed integrally. Thus, a single die part may be used as a whole. Further, the upper upset mold is paired with the lower upset mold on the upper surface of the die. Therefore, if the upper surface of the die is an annular shape, the lower upset mold and the upper upset mold are formed into an annular shape. When the upper surface of the die is square, the lower upset mold and the upper upset mold also have a square ring shape.

According to the present invention, when the thinning is performed by upsetting instead of ironing, and the side wall is expanded by advancing the drawing process, the upper upsetting mold is retracted, so that breakage may occur. No additional force is applied to the workpiece, and thinning can be performed safely.
In addition, the drawing process and the upsetting process are alternately performed to form a metal container (partial thin-walled container) in which a desired thin-walled region is formed at once, so that the process is simplified and can be performed in a short time. Can be processed.
Further, since the upsetting process may be performed only in a necessary place, a plurality of thin regions can be formed in a rib shape on the inner wall side, or the thin regions can be formed in a free range and shape.

(Means and effects for solving other problems)
Further, after (a) the lower thick region forming step and (b) the thin region forming step of the above invention, (c) after all the thinned regions are processed into the thin region, the upper upset mold is retracted. In this state, the upper thick region forming step of forming a thick region near the opening end by performing a drawing process for further reducing the workpiece with the punch may be performed.
Thereby, a thick region can also be formed in the vicinity of the opening end. For example, when a pressure vessel is formed as a final product, the pressure-resistant strength can be maintained high by forming an opening portion requiring pressure resistance in this thick region.

In the thin area forming step (b) of the invention, the upsetting process in the thinning step (b1) may be repeatedly performed at a cycle of at least 10 times / minute.
By performing upsetting continuously at this period, a thin region can be formed efficiently. Here, the upper limit of the period is not particularly limited, and there is no problem as long as the period can be realized in relation to the apparatus cost and the like.

In the thin region forming step (b) of the above invention, the length of the processed portion to be thinned in one thinning step (b1) may be 1 mm to 120 mm.
By making the length of the processing portion to be thinned at one time within this range, breakage hardly occurs and stable processing can be performed continuously.

In the lower thick region forming step of (a) of the above invention, the workpiece to be placed on the die is either a plate-like member or a cup-like member having a bottom wall and side walls previously formed by drawing. But you can.
In the case of a plate-shaped member, since the preliminary drawing is not performed, the number of processing steps can be reduced. When the cup-shaped member is used in advance, the drawing is performed twice, so that the final side wall can be made thin and long.

  Further, the metal container manufacturing apparatus of the present invention made from another viewpoint has a cup-shaped outer shape composed of a bottom wall and a side wall, and a thick region is formed from the bottom wall to the lower end side of the side wall. A metal container manufacturing apparatus for manufacturing a metal container having a structure in which a thin wall region is formed in at least a partial region of a side wall portion following a thick wall region on the lower end side of the side wall, on which a metal workpiece is placed A die hole for drawing is formed in the die, and a region to be a lower upset mold for upsetting is provided on the upper surface of the die, and a position directly above the die hole. A drawing punch is disposed so as to be movable up and down, and an upper upsetting mold is disposed above and below the upper surface of the die to be a lower upsetting mold so as to support the punch and Pan to raise and lower the punch A drive mechanism, an upper upset mold drive mechanism that supports the upper upset mold and raises and lowers the upper upset mold, and the punch drive mechanism and the upper upset mold drive mechanism cooperate with each other. A control unit that operates, and when the control unit forms a thin region on a part of the side wall, the control unit is configured to reduce a part of a workpiece to be processed located on the upper surface of the die by reducing the upper upset mold. And control that retracts the upper upset mold and draws the thinned part immediately before to the die hole under the punch and advances the drawing process to alternate the side wall of the thin part Like to do.

In this case, the control of reducing the thickness of a part of the workpiece to be processed positioned on the upper surface of the die by reducing the upper upset mold may be repeatedly performed at a cycle of at least 10 times / minute.
Further, the length of the processing site where a part of the workpiece to be processed located on the upper surface of the die is reduced by reducing the upper upset mold may be 1 mm to 120 mm.

  According to the metal container manufacturing apparatus of the present invention, a metal container in which a thin region is formed can be manufactured using the manufacturing method described above.

  Hereinafter, embodiments of a manufacturing method and a manufacturing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an overall configuration of a metal container manufacturing apparatus according to an embodiment of the present invention (partially cut away and shown as a sectional view).

  In the metal container manufacturing apparatus 10, the fixing plate 14 is supported by the support columns 12 and 13 erected on the base 11. The position of the fixing plate 14 with respect to the base 11 is fixed. A hydraulic jack 15 is fixed at the center of the fixed plate 14. The piston 16 of the hydraulic jack 15 is equipped with a punch 17 (ram) for performing drawing processing, and the hydraulic jack 15 is used as a punch driving mechanism for moving the punch 17 up and down. The hydraulic jack 15 is provided with a position sensor, a speed sensor, and a force sensor (not shown), and detection signals from these sensors are sent to the control unit 30 described later. Based on a control signal sent from the control unit 30, the height position, the moving speed, and the applied pressure of the punch 17 can be controlled.

A movable plate 18 is disposed between the base 11 and the fixed plate 14. The movable plate 18 is formed with guide holes 18a and 18b through which the columns 12 and 13 pass. Thus, the movable plate 18 can slide in the vertical direction while being guided by the support columns 12 and 13. In addition, a hole 18c for penetrating the punch 17 is formed at the center of the movable plate 18, so that the punch 17 can be moved up and down without colliding with the movable plate 18.
The movable plate 18 and the fixed plate 14 are connected by a pair of link mechanisms 19 and 20, and the link mechanisms 19 and 20 are connected to the drive shafts of the electric actuators 21 and 22. When the electric actuators 21 and 22 are driven, the movable plate 18 moves in the vertical direction with respect to the fixed plate 14. The electric actuators 21 and 22 are also provided with position sensors, speed sensors, and force sensors (not shown), and detection signals from these sensors are sent to the control unit 30 described later. And based on the control signal sent from the control part 30, the height position of the movable plate 18, the moving speed, and the applied pressure can be controlled.

  On the lower surface side of the movable plate 18, an annular upper upsetting mold 26 that performs upsetting processing is fixed in a pair with a lower upsetting mold 24 (upper surface of the die 25) described later. Therefore, the link mechanism 19, 20, the electric actuators 21, 22, and the movable plate 18 constitute an upper upset mold drive mechanism, and the upper upset mold is driven.

  On the base 11, a cylindrical die 25 in which a die hole 25a for drawing is formed is disposed at a position directly below the punch 17. A workpiece W is placed on the die 25. The inner diameter of the die hole 25a is slightly larger than the outer diameter of the punch 17, and the workpiece 17 can be drawn by lowering the punch 17 and pushing the workpiece W into the die hole 25a. It is. In addition, drawing processing of various sizes and shapes can be performed by exchanging with punches 17 and dies 25 having different sizes and shapes.

On the upper surface of the die 25 at a position facing the upper upsetting mold 26, an area to be the lower upsetting mold 24 is provided. When the upper upsetting mold 26 is lowered, the upsetting process is performed at this portion. It is supposed to be done.
As the workpiece W, a plate-like member or a member previously processed into a large-diameter bottomed container shape by drawing is used. The former is used when the side wall is short, and the latter is used when the side wall is thin and long. Here, a workpiece W processed into a large-diameter bottomed container shape is placed.
In addition, when processing the workpiece W processed into the shape of a bottomed container, the fixing jig 27 is attached to the outside of the die 25.

  Next, the control unit 30 of the metal container manufacturing apparatus 10 will be described. The control unit 30 is configured by a computer device including hardware including a CPU, a memory, an input device, and an output device, and programs (software) for realizing various processes.

  The control unit 30 controls the hydraulic jack 15 used as the punch driving mechanism and the electric actuators 21 and 22 used as the upper upsetting mold driving mechanism based on a preset program. By this control, the drawing operation by the lowering of the punch 17 and the upsetting operation by the lowering of the upper upsetting mold 25 are performed, and these processing operations are performed in a coordinated manner, so that a thin wall is formed on a part of the side wall. A region is formed. Specific operations will be described later.

Next, a specific processing operation using the metal container manufacturing apparatus 10 will be described. 2 to 8 illustrate each stage of processing by the manufacturing apparatus 10.
First, as shown in FIG. 2 (a), the punch 17 and the upper upsetting mold 26 are retracted upward, and the workpiece W having a large-diameter bottomed container shape is placed on the die 25 in advance. And fixed with the fixing jig 27 with the bottom facing up (reverse drawing process setting).

Subsequently, as shown in FIG. 2B, the punch 17 is pressed down while the upper upset mold 26 is left as it is, and the workpiece W is drawn. As a result, a part of the workpiece W is pushed into the die hole 25a, and the bottom wall and the lower end side of the side wall are formed.
At this time, the punch 17 is pressed down to a length (L0) where the first portion S0 to be thinned (the lowermost portion of the thinned region to be formed) comes to the region where the upsetting process is performed on the upper surface of the die 25. And stop moving. It should be noted that the punch 17 when the movement is stopped is given a pressing force with such a weak force that drawing does not proceed.

Subsequently, as shown in FIG. 2 (c), the upper upsetting mold 26 is squeezed down and the workpiece W is sandwiched between the lower upsetting mold 24 (the upper surface of the die 25) and the upsetting process is performed. Do. As a result, the processing site is thinned, and the length of the side wall is slightly expanded by the weak pressure applied to the punch 17.
A control signal for setting the upsetting cycle to 10 times / minute or more, more preferably 30 times / minute or more is given from the control unit 30 to increase the machining speed and increase the machining efficiency. When the upsetting process is finished, the side wall is expanded by the length (L1).
The length (L2) to be thinned at this time is determined by the smaller one of the upper upset mold 26 and the lower upset mold 24 to be used. Specifically, the length (L2) is selected in the range of 1 mm to 120 mm by adjusting the width of the mold to be used.

Subsequently, as shown in FIG. 2 (d), the upper upsetting mold 26 is retracted upward, and as shown in FIG. 2 (e), the punch 17 is pushed in, so that the thinned processing site S0 is dies. It is pulled into the hole 25a. Thereby, the side wall of the thin region is expanded. At this time, the length to be pushed into the die hole 25a is set to be the same as or slightly shorter than the previously thinned length (L2), so that the region to be thinned next time is continuous on the upper surface of the die 25. To. (Note that if the length to be pushed in is longer than the previously thinned length (L2), a thick region can be formed between the next thinned region).
After being pushed to the desired position, the punch 17 is again given a pressing force with such a weak force that the drawing process does not proceed.

  Subsequently, as shown in FIG. 2 (f), the upsetting mold 26 is again pressed down to perform upsetting. As a result, the processed portion is thinned, and the side wall is expanded by the length (L1) due to the weak pressure applied to the punch 17.

Thereafter, by repeating the operation described in FIG. 2D to FIG. 2F, the thinned side wall is sequentially expanded.
FIG. 3 is a diagram illustrating a relationship between each state of FIG. 2 and a change in the length of the side wall. As drawing and upsetting are alternately repeated, the side walls are sequentially expanded by length (L2) during drawing and by length (L1) during upsetting.

Then, when the thinning of the side wall is finished and the thick region is formed on the opening side, as shown in FIG. 2 (g), the upper upset mold 26 is retracted, and all the workpieces W are formed into the die holes. The punch 17 is pushed in until it is inserted into 25a.
Thereby, the side wall partially formed with the thin region is completed.

In the above embodiment, when the workpiece W having a large-diameter bottomed container shape is placed on the die 25, the bottom is directed upward (reverse drawing), but the present invention is not limited to this.
FIG. 4 is a view showing a main part in the case of processing the bottomed container-shaped workpiece W with the bottom facing up (forward drawing). 1 and 2 are denoted by the same reference numerals.
In this case, by arranging a fixing jig 27a taller than the die 25 on the outside of the die 25, the same processing can be performed using this as a guide.

  FIG. 5 is a view showing a main part when a plate-like member is processed. In this case, by arranging the auxiliary table 28 having the same height as the upper surface of the die 25 on the outside of the die 25, the plate-like member can be processed while being supported.

(Other embodiment)
In the metal container manufacturing apparatus 10 described above, a punch drive mechanism using a hydraulic jack or an upper upset mold drive mechanism using an electric actuator is used, but the drive mechanism can have various variations.
For example, an electromechanical actuator such as a servo motor, a ball screw, or a mechanical force amplifying device can be used for the punch driving mechanism. The same applies to the upper upset mold drive mechanism.
Further, in the metal container manufacturing apparatus 10, the fixed plate 14 is supported by the two columns 12, 13, and the movable plate 18 is guided. However, when the size is increased, three columns, You may increase with four. In this case, the support columns are arranged in directions that rotate by 120 degrees and 90 degrees about the axis of the punch 17.

  The present invention can be used for manufacturing a metal container in which a thin wall region is included in a side wall.

The block diagram of the metal container manufacturing apparatus which is one Embodiment of this invention. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows one of the processing states by the metal container manufacturing apparatus of FIG. The figure which shows the relationship between each state of FIG. 2, and the change of the length of a side wall. The figure which shows the case where it processes with the bottom of the to-be-processed member W of a bottomed container shape facing up (forward redrawing process). The figure which shows the case where the to-be-processed member W which consists of a plate-shaped member is processed. Sectional drawing of the metal container (partial thin wall container) which changed the thickness of the side wall partially thinly. The figure which shows the prior art example of the manufacturing process at the time of manufacturing a metal container (partial thin wall container). Sectional drawing of the metal container (partial thin container) which formed the some thin area | region in the inner wall side in the shape of a rib.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Metal container manufacturing apparatus 11 Base 12, 13 Support | pillar 14 Fixed plate 15 Hydraulic jack 17 Punch 18 Movable plate 19, 20 Link mechanism 21, 22 Electric actuator 24 Lower upset die (die upper surface)
25 Die 25a Die hole 26 Upset mold 27 Fixing jig

Claims (8)

A cup-shaped outer shape composed of a bottom wall and a side wall; a thick wall region is formed from the bottom wall to a lower end side of the side wall; and at least one of the side wall portions following the thick wall region on the lower end side of the side wall. A metal container manufacturing method for manufacturing a metal container having a structure in which a thin region is formed in a partial region,
A die in which a die hole for drawing is formed;
A punch for drawing disposed so as to be movable up and down at a position directly above the die hole;
Using an upper upset mold that is disposed so as to be movable up and down at an upper position facing the upper surface of the die, and performs upsetting on a workpiece by using the upper surface of the die as a lower upset mold,
(A) a lower thick region forming step of forming a thick region on the bottom wall and the lower end side of the side wall by drawing processing to reduce the workpiece placed on the die with the punch;
(B) A thinning step (b1) in which a part of the side wall to be thinned is placed on the upper surface of the die, and the processing part is thinned by performing an upsetting process by reducing the upper upsetting mold, In addition, the upper upset mold is retracted upward, and the thinned processing portion is pushed into the die hole by the punch down pressure, and the thinned processing portion is drawn. In this case, if there is a further thinning planned portion, the thinned region advancing step (b2) of placing the planned thinning portion to be subjected to upsetting on the upper surface of the die is alternately repeated. A method for producing a metal container comprising a thin-wall region forming step of sequentially processing thinned regions into thin-wall regions. A cup-shaped outer shape composed of a bottom wall and a side wall, and a thick region is formed in a region from the bottom wall to the vicinity of the lower end of the side wall and a region near the opening end of the side wall; A metal container manufacturing method for manufacturing a metal container having a structure in which a thin region is formed between a thick region on the lower end side and a thick region near the opening end of the side wall,
A die in which a die hole for drawing is formed;
A punch for drawing disposed so as to be movable up and down at a position directly above the die hole;
Using an upper upset mold that is disposed so as to be movable up and down at an upper position facing the upper surface of the die, and performs upsetting on a workpiece by using the upper surface of the die as a lower upset mold,
(A) a lower thick region forming step of forming a thick region on the bottom wall and the lower end side of the side wall by drawing processing to reduce the workpiece placed on the die with the punch;
(B) A thinning step (b1) in which a part of the side wall to be thinned is placed on the upper surface of the die, and the processing part is thinned by performing an upsetting process by reducing the upper upsetting mold, In addition, the upper upset mold is retracted upward, and the thinned processing portion is pushed into the die hole by the punch down pressure, and the thinned processing portion is drawn. In this case, if there is a further thinning planned portion, the thinned region advancing step (b2) of placing the planned thinning portion to be subjected to upsetting on the upper surface of the die is alternately repeated. , A thin region forming process that sequentially processes the thinned portion into a thin region;
(C) After the portion to be thinned is processed into a thin region, with the upper upset mold retracted, the member to be processed is further drawn with the punch to reduce the thickness near the opening end. A metal container manufacturing method comprising an upper thick region forming step for forming a region. 3. The metal container manufacturing method according to claim 1, wherein in the thin region forming step of (b), the upsetting process in the thinning step (b1) is repeatedly performed at a cycle of at least 10 times / min. The metal container according to any one of claims 1 to 3, wherein in the thin region forming step (b), the length of the processed portion to be thinned in one thinning step (b1) is 1 mm to 120 mm. Production method. In the lower thick region forming step of (a), the workpiece to be placed on the die is a plate-like member or a cup-like member having a bottom wall and a side wall previously formed by drawing. The metal container manufacturing method in any one of Claim 4. A cup-shaped outer shape composed of a bottom wall and a side wall, wherein a thick region is formed from the bottom wall to the lower end side of the side wall, and at least a part of the side wall portion following the thick region on the lower end side of the side wall A metal container manufacturing apparatus for manufacturing a metal container having a structure in which a thin region is formed in an area,
A die on which a metal workpiece is placed is disposed,
The die is formed with a die hole for drawing processing, and an upper surface of the die is provided with a region to be a lower upsetting mold for upsetting processing,
A drawing punch is disposed at a position directly above the die hole so as to be movable up and down,
An upper upset mold is disposed so as to be movable up and down at a position above the area of the lower upset mold on the upper surface of the die,
A punch drive mechanism for supporting the punch and raising and lowering the punch;
An upper upside mold drive mechanism for supporting the upper upset mold and raising and lowering the upper upset mold;
A control unit that operates the punch driving mechanism and the upper upset mold driving mechanism in cooperation with each other;
The control unit is configured to reduce a part of a workpiece to be processed on the upper surface of the die by reducing the upper upsetting mold when forming a thin area on a part of the side wall, The process of retracting the mold and pushing the thinned portion immediately before into the die hole by the punch pressure to advance the drawing process and alternately extending the side wall of the thin region is performed. Metal container manufacturing equipment.   The metal container manufacturing apparatus according to claim 6, wherein the control for reducing the thickness of a part of the workpiece located on the upper surface of the die by reducing the upper upset mold is repeatedly performed at a cycle of at least 10 times / minute. The metal container manufacturing apparatus according to claim 6 or 7, wherein a length of a processing part where a part of a workpiece to be processed on the upper surface of the die is reduced in thickness by reducing the upper upset mold is 1 mm to 120 mm. .

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