JP2002254117A - Method for manufacturing metallic container member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for promptly and simply manufacturing a metallic container member on whose corner sections volumetric corrosion cracking never occurs or possibility of corrosion cracking is extremely less, in the method for manufacturing the metallic container member which is roughly separated into the bottom wall, the side wall having the corner section and the flange continuously formed on the side wall. SOLUTION: After the whole container member 1 composed of the bottom wall 10, the side wall 20, and the flange 20 is drawn and formed, at least one of the two adjustments forming to enlarge curvature radius (R1→R2) of the side wall corner section 21 or to enlarge peripheral length (L1→L2) of the flange corner section can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal container member formed by press drawing, and more particularly, to a method of manufacturing a metal container member having improved corner portion characteristics. About.

[0002]

2. Description of the Related Art Metal containers exist in various shapes and are used for various purposes. For example, an automobile fuel tank as shown in FIG. 1 is one of them. This automotive fuel tank has a substantially square shape, and is formed by joining two half-divided container members 1 together. The container member constituting such a metal container is generally formed by drawing from a plate-like material by pressing.

[0003] A container member 1 of a fuel tank for an automobile shown in FIG. 1 has a bottom wall 10 whose center portion is gently depressed, a side wall 20 surrounding the bottom wall, and a flange 3 projecting from the side wall 20.
0, the side wall 20 has a corner portion 21, and the flange 30 also has a side wall corner portion 21.
And has a corner portion 31 that is continuous with It is well known that in a container member having such a shape, stress corrosion cracking and aging cracking are likely to occur in corner portions, specifically, in the side wall corner portion 21 and the flange corner portion 31.

[0004] In particular, in the case of an austenitic stainless steel container member, there is a high possibility that stress corrosion cracking will occur at the corners, and flammable contents such as the exemplified fuel tanks for automobiles are accommodated. For containers and the like, there is a trend to replace carbon steel with stainless steel for the purpose of improving the durability.However, the above-mentioned problem of stress corrosion cracking at corners is a major obstacle. That is the current situation.

[0005]

Consider a case in which a container member of an automotive fuel tank shown in FIG. 1 made of austenitic stainless steel is formed by press drawing. FIG.
2 shows a container member and a plate-like material (stainless steel plate) that is used as a material for molding the container member. In FIG. 2, the container member 1 is viewed from above, and the plate-like material 2 is a square plate having an area capable of forming a bottom wall, a side wall, and a flange, and each corner is a rectangular shape cut diagonally. Has made.

[0006] Unlike the simple bending, the drawing is a forming method involving plastic flow of the material. When the container is drawn, there is a large plastic flow at the corner. FIG. 3 shows a state of plastic flow in a corner portion when the container member 1 is drawn from the plate-like material 2. Parts other than corners are formed in a state close to bending, but corners are represented by thin arrows,
A plastic flow occurs that results in a large material concentration. That is, since the portion of the plate-like material that is to form the corner is excessive compared to other portions, the excess material tends to flow into the corner. Therefore, the side wall corner portion 21 and the flange corner portion 31 are drawn while the material forming the corner portion receives a large compressive stress in the circumferential direction of the container.

Next, a state after completion of such drawing is considered. In that state, that is, in the state released from the mold, the material of the corner portion formed while receiving compressive stress, as if reacting, left the opposite direction stress, that is, the stress in the direction pulled from both sides in the circumferential direction. State. In other words, a large tensile stress in the circumferential direction of the container remains at the corners, more specifically, the side wall corners 21 and the flange corners 31 as shown by white arrows in the figure. The existence of the residual stress is a factor of the above-described stress corrosion cracking when the container is used in a corrosive environment.

In order to prevent stress corrosion cracking, as a method of removing residual tensile stress, for example, a method of ironing a corner, peening a corner, or performing a heat treatment may be considered. However, since ironing involves a large amount of heat generation, for example, in the case of a metal such as stainless steel having high hardness and low thermal conductivity, the ironing die is severely damaged, making it a suitable method for mass production. I can't get it. Further, methods such as peening and heat treatment require dedicated equipment and require a long time for the treatment, which results in an increase in the manufacturing cost of the container member.

The present invention has been made in view of the situation of occurrence of stress corrosion cracking of the above metal container member having a corner formed by drawing from a plate-like material. It is an object of the present invention to provide a manufacturing method capable of easily and quickly manufacturing a metal container member having extremely low possibility of occurrence.

[0010]

(1) A method of manufacturing a metal container member according to the present invention is a method of manufacturing a metal container member roughly divided into a bottom wall and a side wall having a corner portion. In order for the radius of curvature of the corner of the side wall to be R1,
A draw forming step of drawing and forming the entire container member from the metal plate-like material; and a side wall corner adjusting step of adjusting and forming the side wall corner so that the radius of curvature of the side wall corner is R2 after the draw forming step. Radius of curvature R1
<Characteristic radius R2 (corresponding to claim 1).

In other words, this manufacturing method is a method of manufacturing a container member in which stress corrosion cracking does not occur at the corner of the side wall. After the side wall corner is once drawn to a small radius of curvature, the corner is formed at a desired corner. This is a method of forming so as to bend back to a radius of curvature. As mentioned above,
The tensile strength in the circumferential direction remains in the corner portion of the drawn side wall. In the present production method, after drawing,
By adjusting and molding so as to increase the radius of curvature of the side wall corner, the residual stress is removed or reduced. As a result, according to the manufacturing method of the present invention, it is possible to manufacture a metal container member in which stress corrosion cracking does not occur at the side wall corner portion or is extremely unlikely to occur. In addition, since the side wall corner adjusting step employs a simple method such as bending back, no special equipment is required, the speed of manufacturing the container member is not lost, and the manufacturing cost is not particularly increased. .

The shape of the metal container member to which the present manufacturing method is applied is not specifically limited. Any shape may be used as long as it has a substantially bottom wall surface and a substantially side wall surface, and can be drawn and formed by pressing. In other words, the boundary between the bottom wall and the side wall does not necessarily need to be clearly understood. For example, a portion that is considered to be the boundary between the two may be configured with a curved surface. However, for the purpose of the container member of the present invention, it is necessary that the side wall has at least one corner. Further, the bottom wall does not mean a portion located at the bottom, that is, a lower portion of the container, and may be a portion located at an upper portion or a side portion of the container. Here, the “bottom wall” means a substantially bottom portion when the opening of the container member is directed upward, and should be interpreted as a name for distinguishing from the “side wall”. "Bottom wall", "side wall"
Is the same in the manufacturing method of the following embodiment.

Further, the container member illustrated in FIGS. 1 and 2 has a flange, and the container member generally divided into a bottom wall and a side wall includes one having such a flange. . Conversely, it is not necessary to have such a flange. Therefore, the term “substantially divided into a bottom wall and a side wall having a corner” as used herein means a substance substantially having a bottom wall and a side wall and including other components such as a flange. You may.

Further, the radii of curvature R1 and R2 at the corners of the side wall do not mean a single value. That is, a corner portion may have a different value depending on the portion in one corner portion. Before and after the side wall corner portion adjusting step, when the same portion considered to be equivalent is measured, R1 <R2 substantially holds, and if a process is performed so that the radius of curvature of the corner portion becomes large as a whole. Good.

The adjustment molding in the side wall corner adjustment step is not particularly limited to a specific method, and may be any method that substantially increases the radius of curvature of the corner. As a quick method, press molding in which the relevant portion is sandwiched by a mold having a predetermined radius of curvature can be employed.

(2) Another method of manufacturing a metal container member according to the present invention is a metal container member roughly divided into a side wall having a bottom wall and a corner portion and a flange formed continuously with the side wall. And a draw forming step of draw forming the entire container member from a metal plate-like material so that the peripheral length of the corner portion of the flange continuous to the corner portion of the side wall is L1, and after the draw forming step And a flange corner adjustment step of adjusting and forming the flange corner so that the circumference of the flange corner is L2, wherein the circumference L1 <the circumference L2. 2).

That is, this manufacturing method is a method for manufacturing a container member having a flange, in which stress corrosion cracking does not occur at a corner of the flange. As described above, also at the flange corners, material concentration occurs due to drawing, and a tensile stress in the circumferential direction remains. In the manufacturing method according to this aspect, in order to remove or reduce the tensile stress at the flange corner, in the flange corner adjusting step, a forming process is performed such that the corner of the flange is elongated. According to the manufacturing method of the present invention, the possibility of stress corrosion cracking does not occur at the flange corner portion by adding the flange corner portion adjusting step of performing forming processing to increase the circumferential length of the flange corner portion. Can be manufactured.

The shape of the metal container member to which the present manufacturing method is applied is not specifically limited. Any shape may be used as long as it has a wall surface which is substantially a bottom side and further has a continuous flange on the side wall and which can be integrally formed by pressing. The boundary between the side wall and the flange does not necessarily need to be clearly understood, and, for example, a portion considered to be the boundary between the two may be configured as a curved surface. However, for the purpose of the container member of the present invention, the flange needs to have at least one corner portion that is continuous with the side wall corner portion.

In the container member illustrated in FIGS. 1 and 2 above, the flange is annular in a circumferentially continuous manner.
The flange is not necessarily limited to such an annular shape, and may be a discontinuous flange, that is, a flange formed integrally with only a part of the side wall. In general, the circumferential lengths L1 and L2 may be controlled by the outer peripheral length, and the flange corner adjusting step may be performed such that the flange corner is managed to be substantially extended in the circumferential direction and the forming process is performed. .

(3) In the method for manufacturing a metal container member according to the present invention, a metal container member roughly divided into a side wall having a bottom wall and a corner portion and a flange formed continuously with the side wall is manufactured. A method of drawing a whole container member from a sheet metal material such that a radius of curvature of a corner portion of a side wall is R1 and a peripheral length of a corner portion of a flange continuous to the corner portion of the side wall is L1. Draw forming process,
After the drawing process, the radius of curvature of the corner of the side wall is R
A side wall corner adjusting step of adjusting and forming the side wall corner so as to obtain a flange corner adjusting step of adjusting and forming the flange corner so that the circumferential length of the flange corner is L2 after the drawing step. (The radius of curvature R1 <the radius of curvature R2, and the circumference L1 <the circumference L2) (corresponding to claim 3).

In other words, this is an embodiment in which the above-described two manufacturing methods for the side wall corner portion and the flange corner portion are combined. By adding both the side wall corner adjusting step and the flange corner adjusting step, the residual tensile stress in the circumferential direction is removed or reduced at any corner, and according to the manufacturing method of this aspect, It is possible to manufacture a metal container member in which stress corrosion cracking does not occur or is very unlikely to occur in the portion, that is, a metal container member having extremely good durability characteristics.

(4) In the case of the manufacturing method of the above aspect in which both the side wall corner and the flange corner are adjusted, the side wall corner adjustment and the flange corner adjustment are performed in the same step. (Corresponding to claim 4).

The side wall corner adjusting step and the flange corner adjusting step can be performed independently using separate equipment. In this case, the order of the two steps is not limited, and the order can be arbitrarily determined in view of the convenience of the steps, the facilities, and the like. However, performing both steps separately results in extending the manufacturing time of the container member to some extent. If the side wall corner adjusting step and the flange corner adjusting step are performed in the same step as in the manufacturing method of this aspect, the manufacturing process can be simplified, the manufacturing time can be shortened, and in some cases, the manufacturing equipment can be simplified. Thus, the metal container member can be manufactured more quickly and at lower cost.

(5) In the method for producing a metal container member according to the aspect of the present invention, the method further comprising a step of adjusting and forming a flange corner portion, wherein in the drawing step, the angle formed between the side wall and the flange is θ1; In the flange corner adjusting step, an angle between the side wall and the flange is adjusted and formed to be θ2, and an angle θ1> an angle θ
By setting to 2, the embodiment can be implemented in such a way that the circumference L1 <the circumference L2.

As described above, in the flange corner adjusting step, the forming may be performed by managing the flange corner so as to be substantially extended in the circumferential direction. For example, it is possible to adopt a process in which both sides of the corner are held and the corner is stretched. However, such a method requires some complicated jigs and molds,
It is difficult to achieve the same process as the side wall corner.

In the flange corner adjusting step of this embodiment, the angle formed between the side wall and the flange is formed gently in the draw forming, and a forming process is performed so that the angle is made tight. That is, an object formed once at an obtuse angle is adjusted and formed so as to be bent in an acute angle direction. Since the flange is integrally continuous with the side wall, the peripheral length of the flange, particularly the outer peripheral length, is greatly extended by such bending.
For example, if press working such as being sandwiched by a mold having a predetermined angle is adopted, the tensile residual stress at the flange corner portion is removed or reduced by rapid forming.

Further, if press molding in which a mold is sandwiched is employed, the same as the above-described side wall corner adjusting step can be easily achieved. In other words, by making the mold adaptable to the adjustment molding of both corners of the side wall and the flange, it is possible to simultaneously remove or reduce the residual stress of the side wall corner and the flange corner in one stroke.

(6) The method for manufacturing a metal container member of the present invention is preferably implemented as a method for manufacturing a stainless steel container member, wherein the metal plate-shaped material is an austenitic stainless steel plate. (Corresponds to item 6).

In the method for producing a metal container member of the present invention, the kind of the metal is not particularly limited. For example, the manufacturing method of the present invention can be sufficiently applied to any metal container member that can be drawn from a plate-shaped material such as carbon steel, stainless steel, and aluminum alloy. Among various metallic container members, when applied to the production of austenitic stainless steel container members, which are materials that are susceptible to stress corrosion cracking, the effect of preventing stress corrosion cracking by the production method of the present invention is not significant. It will be demonstrated without.

(7) The method for producing a metal container member of the present invention is suitable as a method for producing a container member for an automobile fuel tank (corresponding to claim 7).

The metal container to which the manufacturing method of the present invention is applied is not particularly limited in its use, but may be a container constituting a metal container for various uses. For example, as described above, the fuel tank for automobiles has a combustible material such as gasoline,
It is required to have high durability since it is used in a severe environment such as an external force load due to vibration or the like and exposure to the atmosphere. In view of this point, the manufacturing method of the present invention capable of manufacturing a container member in which the stress corrosion cracking in the corner portion is prevented and reduced is suitable for manufacturing a container member constituting an automobile fuel tank.

In addition, there is a trend to replace carbon steel plates with stainless steel plates in order to improve the durability of automobile fuel tanks. Therefore, when applied to the production of an austenitic stainless steel automobile fuel tank, the effect of reducing the stress corrosion cracking by the production method of the present invention is particularly exhibited.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing a metal container material of the present invention will be described below in detail with reference to the drawings.

The container member to which the manufacturing method of the following embodiment is applied is a container member constituting a fuel tank for an automobile having a shape shown in FIG. 1, and constitutes an upper portion of the tank. The container member 1 has a substantially square shape, and can be recognized as a rectangular container member having a substantially arc-shaped corner when viewed from directly above as shown in FIG. This container member 1 is roughly divided into a bottom wall 10 whose central portion is gently depressed, a side wall 20 surrounding the bottom wall, and a flange 30 projecting from the side wall 20, and the side wall 20 has a corner portion 21. The flange 30 also has a corner portion 31 that is continuous with the side wall corner portion 21.

In manufacturing the container member 1, first, a drawing step of drawing the entire container member from an austenitic stainless steel plate is performed. The stainless steel plate used has a shape shown by a two-dot chain line in FIG. 2, and has a rectangular shape in which each corner is obliquely cut.

FIG. 4 schematically shows a drawing mold for performing drawing by press. The drawing mold 3 includes an upper mold 50 and a lower mold 60 facing each other.
Is composed of an upper main mold 51 having a mold surface located at the center thereof and having a shape along the inner wall surface of the container member, and an upper wrinkle retainer 52 existing around the upper main mold 51. The lower mold 60 is constituted by a lower main mold 61 having a mold surface in the center thereof and having a shape along the outer wall surface of the container member, and a lower mold wrinkle holder 62 existing around the lower main mold 61. I have. Further, the upper main mold 51 and the lower main mold 61 are respectively formed with bottom wall forming portions 51a and 61a for forming the bottom wall of the container member, side wall forming portions 51b and 61b for forming the side wall, and a flange forming portion for forming the flange. It is roughly divided into 51c and 61c.

FIG. 4 is a sectional view including two diagonally existing corner portions. In both corner portions, the side wall forming portions 51b, 61b of the upper main mold 51 and the lower main mold 61 are formed. Flange forming parts 51c, 61c
As shown in the drawing, the angle between the side wall and the flange of the container member having the desired shape (shape after the corner adjustment step described later) is looser, that is, larger. Although not shown in the drawing, the radius of curvature of the side wall forming portions 51b and 61b in the upper main mold 51 and the lower main die 61 forming the side wall corners is larger than the radius of curvature of the side wall corners in the container member having the target shape. It has a large radius of curvature.

In the drawing, the stainless steel plate (plate material) 2 described above is set at a predetermined position in a drawing die 3. First, the wrinkle presser 52 of the upper mold 50 is attached to the lower mold 60.
The stainless steel plate 2 is lowered toward the wrinkle retainer 62 so that the stainless steel plate 2 is held between the two by a predetermined force. Next, in this state, the upper main mold 51 is lowered toward the lower main mold 61, and the stainless steel plate 2 is sandwiched between them. As a result, the periphery of the stainless steel plate 2 moves so as to slide between the two wrinkle retainers 52 and 62, while the upper main die 51 and the lower main die 61 move.
The container member is formed in a shape along the mold surface of (1).

After the drawing step, the drawn container member is subjected to a corner adjusting step. In the manufacturing method of the present embodiment, the corner adjusting step is a step in which the side wall corner adjusting step of adjusting and molding the side wall corner and the flange corner adjusting step of adjusting and molding the flange corner are integrated. .

For the sake of explanation, the difference in shape between the corner portion of the drawn container member and the corner portion of the container member that has been subjected to the corner portion adjusting step will be described first. Give an overview. FIG. 5 is a perspective view showing the shape of each corner. 5A shows a corner portion of the drawn container member, that is, a corner portion before being subjected to the corner portion adjusting step, and FIG. 5B shows a corner portion after passing through the corner portion adjusting step. Are respectively shown.

As shown in the figure, the side wall corner 21 is
The radius of curvature is R1 after drawing, and the radius of curvature is R2 after the corner adjustment step, and R1 <R
The relationship is 2. That is, in the corner adjusting step, the side wall corner 21 is formed so as to have a large radius of curvature. Further, the peripheral length of the flange corner portion 31 is L1 after drawing and the peripheral length is L2 after the corner portion adjusting step, and the relationship of L1 <L2 is established. In other words, the flange corner portion 31 is adjusted and formed into a shape that is just stretched.

FIG. 6 is a cross-sectional view showing a change in the shape of the corner in the corner adjusting step. FIG.
6A shows a circumferential section, and FIG. 6B shows a vertical section. In each of the drawings, the cross-sectional shape after drawing is indicated by a broken line, and the cross-sectional shape after adjustment of a corner portion is indicated by a solid line. As shown in FIG. 6A, the side wall corner portion 21 is formed so as to have a curvature radius of R1> R2 in the same circumferential section.

As shown in FIG. 6B, in the corner adjusting step, the flange 30 and the side wall 2 are formed at the corner.
The angle made with 0 is changed. In the drawing process,
As described above, the angle between the side wall and the flange is formed to be as large as θ1, and then, in the corner adjusting step, the corner is bent so that the angle becomes as small as θ2 (θ1> θ2). As a result, the radius of curvature of the outer circumference of the flange corner changes from r1 to r2 (r1 <r2), and the flange circumference of the corner increases from L1 to L2.

As described earlier with reference to FIG. 3, after the drawing, circumferential tensile stress due to the concentration of the material remains at the side wall corners and the flange corners. However, if the corner is formed by adjusting and forming the corner as described above, the tensile stress remaining in the corner is removed or reduced.

In the present embodiment, the corner adjusting step is specifically performed by press-molding the corner of the drawn container member. FIG. 7 schematically shows a cross section of the adjustment mold used in this step. FIG.
7A shows a cross section in the circumferential direction, and FIG. 7B shows a cross section in the vertical direction. The adjustment mold 4 is composed of an upper mold 70 and a lower mold 80. The mold surface of the upper mold 70 has a shape along the inner wall surface of the container member having the target shape, and the mold surface of the lower mold 80 has It is formed in a shape along the outer wall surface of the container member having the desired shape. By using a suitable press device, the container member after drawing is sandwiched between the upper die 70 and the lower die 80, thereby completing the adjustment molding of the corner portion.

In this corner adjusting step, the side wall corner and the flange corner can be adjusted and formed at the same time, and the corner can be adjusted and formed very simply and quickly. Further, since no special equipment is required, it is possible to eliminate or reduce the tensile stress remaining in the corner portion by drawing without increasing the production cost of the container member.

The embodiment of the method for manufacturing a metal container member according to the present invention has been described above. However, the method for manufacturing a metal container member according to the present invention is not limited to the above embodiment. And other various modifications and alterations that can be made by those skilled in the art.

[0048]

The present invention relates to a method of manufacturing a metal container member having a corner portion formed by drawing from a plate-like material. The method comprises adjusting and forming such that the radius of curvature of the side wall corner is increased after drawing. It is configured to add at least one adjustment molding of the adjustment molding that increases the circumferential length of the flange corner portion. With such a configuration, the method for manufacturing a metal container member of the present invention can quickly and easily manufacture a metal container member that does not generate or has a very low possibility of capacity corrosion cracking at its corner. Method.

[Brief description of the drawings]

FIG. 1 shows an example of a container member to which a method for manufacturing a metal container member according to the present invention can be applied.

FIG. 2 shows a container member of the fuel tank for an automobile shown in FIG. 1 and a plate-shaped material which is a raw material when the container member is formed.

3 shows a state of plastic flow in a corner portion when a container member of the fuel tank for an automobile shown in FIG. 1 is drawn from a plate-like material.

FIG. 4 schematically shows a mold for drawing and forming the container member of the fuel tank for an automobile shown in FIG.

FIG. 5 is a perspective view showing the shape of each of the drawn-in container member and the corner portion of the container member that has undergone the corner portion adjusting step in the manufacture of the container member of the automotive fuel tank shown in FIG.

FIG. 6 is a sectional view showing a change in the shape of a corner in a corner adjusting step in the manufacture of the container member for the fuel tank for an automobile shown in FIG.

FIG. 7 schematically shows a cross section of an adjustment mold used in a corner adjustment step in the manufacture of the container member of the vehicle fuel tank shown in FIG.

[Explanation of symbols]

 1: Metal container member (vehicle fuel tank) 10: Bottom wall 20: Side wall 21: Side wall corner 30: Flange 31: Flange corner 2: Plate material (stainless steel plate) 3: Drawing die 4: Adjustment Die R1, R2: radius of curvature of side wall corner L1, L2: circumference of flange corner θ1, θ2: angle between side wall and flange

Claims (7)

[Claims] 1. A method of manufacturing a metal container member roughly divided into a bottom wall and a side wall having a corner portion, wherein the container is made of a metal plate material such that a radius of curvature of a corner portion of the side wall is R1. A draw forming step of draw forming the entire member; and after the draw forming step, the radius of curvature of the side wall corner is R.
A side wall corner adjusting step of adjusting and forming the side wall corner so as to satisfy 2. A method of manufacturing a metal container member, wherein the curvature radius R1 <the curvature radius R2. 2. A method of manufacturing a metal container member generally divided into a side wall having a bottom wall and a corner portion and a flange formed continuously with the side wall, wherein the flange is continuous with a corner portion of the side wall. A draw forming step of drawing the entire container member from the metal plate-like material so that the circumferential length of the corner portion becomes L1; and after the draw forming step, the circumferential length of the flange corner portion becomes L.
2. A method of manufacturing a metal container member, comprising: a flange corner portion adjusting step of adjusting and forming a flange corner portion so as to satisfy 2. Perimeter L1 <Perimeter L2. 3. A method for manufacturing a metal container member generally divided into a side wall having a bottom wall and a corner portion and a flange formed continuously with the side wall, wherein a radius of curvature of a corner portion of the side wall is reduced. A draw forming step of drawing the entire container member from the metal plate-like material so that R1 and the peripheral length of the corner of the flange continuing to the corner of the side wall become L1, after the draw forming step The radius of curvature of the side wall corner is R
A side wall corner adjusting step of adjusting and forming the side wall corner so as to be 2, and a peripheral length of the flange corner is L after the drawing step.
And a flange corner adjusting step of adjusting and forming the flange corner so as to be 2. The radius of curvature R1 <the radius of curvature R2 and the circumference L1 <
A method for manufacturing a metal container member having a circumference L2. 4. The method according to claim 3, wherein the side wall corner adjusting step and the flange corner adjusting step are the same step. 5. In the draw forming step, the angle between the side wall and the flange is formed so as to be θ1, and in the flange corner adjusting step, the angle between the side wall and the flange is θ2. 5. The method for manufacturing a metal container member according to claim 2, wherein the peripheral length L1 is smaller than the peripheral length L2 when the angle θ1> the angle θ2. 6. The method for manufacturing a metal container member according to claim 1, wherein the metal plate material is an austenitic stainless steel plate, and a stainless steel container member is manufactured. 7. The method for producing a metal container member according to claim 1, wherein the container member for an automobile fuel tank is produced.