JPS6293031A - Production of bottomed cylindrical body having oblate circular cross section - Google Patents

Abstract

PURPOSE:To reduce the production cost remarkably than in the past by obtaining the bottomed cylindrical body having an oblate circular cross section by one time of working with a die and punch. CONSTITUTION:The slab like metallic plate blank 3 in rectangular shape having the width L1 exceeding 0.5 times of the peripheral length of a punch 1 is arranged so that the center 0 thereof coincides with the center axial line P of a die-punch and that the short side 31 running along the width direction of the metallic plate blank 3 becomes in parallel to the oblate circular major shaft Q of the cross section of the punch 1 between the punch 1 having an oblate circular cross section and a die 2. And, by executing one time of slab drawing by the die 2 and punch 1 on the metallic plate blank 3, the bottomed cylindrical body which makes the bottomed cylindrical shape of the necessary strength having a oblate circular cross section and which has the continuous seam upto the opening end from the middle position in the space from he bottom face upto the opening end on the wall part of both end parts in the length direction of the oblate cross section thereof is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method of manufacturing a bottomed metal cylindrical body used as various containers, and particularly to a method for manufacturing a metal cylinder with a flat circular cross section, such as an oval shape or an elliptical shape. The present invention relates to a method of manufacturing a bottomed cylindrical body.

2. Description of the Related Art Conventional methods for manufacturing metal containers include two methods: molding the bottom and wall portions integrally, and molding the bottom and wall portions separately.
It is broadly divided into joining and gluing methods. The former method involves deep drawing, overhanging, and ironing.
The seeds or two or more seeds are applied once or more in combination as necessary to obtain a container with an integrated bottom and wall,
On the other hand, in the latter method, the wall is created by combining one or more of bending, rolling, and folding processes with bonding and gluing, and the bonding and gluing between the bottom and wall are roughly formed. It is used for processing.

Problems to be Solved by the Invention Among the conventional methods described above, in the former method in which the bottom and wall parts are integrally molded, if a container with a certain depth or more is to be opened, it is necessary to remove the container in one go. This method is difficult to process and requires at least two processing steps, which makes it less economical in terms of equipment and other aspects.Also, the container obtained by this method has a perfectly circular cross section. The actual situation is that it has not yet been technically established to create a bottomed cylindrical body with an oval or elliptical cross section, as is the object of this invention.

On the other hand, with the latter method, it is relatively easy to create a deep container, and it is also possible to create a bottomed cylindrical body with an oval or elliptical cross section, but the number of steps is longer than the previous method. method, the manufacturing costs must therefore be significantly higher.

The present invention has been made against the background of the above-mentioned circumstances, and an object of the present invention is to provide a method by which a bottomed cylindrical body having an arbitrary depth and a flat circular cross section can be simply and easily obtained by a single molding process. The purpose is to

Means for Solving the Problems In the method of manufacturing a bottomed cylindrical body having one or more flat circular sections according to the present invention, the I! ] A substantially rectangular flat metal plate material having a width exceeding 0.5 times f4 is prepared so that the center of the metal plate element A coincides with the center line of the die-bonder and the width of the metal plate material is By arranging the die so that the direction is parallel to the length direction of the flat circular cross section of the die, and performing one flat drawing process on the metal plate material with the die and punch, a sheet having the required strength and having a flat circular cross section is obtained. A bottomed cylindrical body having a bottom cylindrical shape and having a continuous seam from a midway position between the bottom surface and the open end to the open end on the walls of both ends of the flat cross section in the cutting direction. It is characterized by obtaining.

Function: The method of the present invention provides a method for forming a bottomed cylindrical body having an arbitrary depth and having a flat circular cross section, and in the longitudinal direction of the flat circular cross section (
A cylindrical body having a continuous seam from a midway point between the bottom surface and the open end to the open end on the walls at both ends in the longitudinal direction) can be formed by one machining process using a die and punch.

In the past, it had never been considered to form a cylindrical body with a seam and use it for a container or the like. However, according to the experiments and studies conducted by the inventors of the present application, it has been found that the seam formed in this way becomes crimped at the same time as the molding, and exhibits airtightness sufficient for practical use as containers, etc. ing. However, in some cases, in order to further improve the airtightness, it is of course possible to join or bond the joints by known methods such as welding, brazing, etc. On the other hand, according to the method of the present invention, a cylindrical body of arbitrary strength can be manufactured as described later, and therefore, a long cylindrical body can be used as a construction material such as a beam of a building structure or various mechanical devices. It can also be used as a strength member, but in such cases complete airtightness is often not required.
In that case, it is possible to use the molded product as it is without joining or gluing the seams.

According to the method of the present invention, a cylindrical body having a flat circular cross section and an arbitrary depth can be obtained. In other words, if the length of the rectangular metal plate material in the direction (long side direction) perpendicular to the width direction (short side direction) is increased, the length of the seam will become longer and the seam will be deeper. A bottomed cylindrical body can be obtained.

The width of the metal plate material must be more than 0.5 times the circumference of the punch. The reason for this is that if the width of the metal plate material or the circumference of the die is less than 0.5 times, the seam as described above will not be formed and the part will be distorted, or even if the part is butted, it will not be enough. This is because it is not crimped. If the joint is not sufficiently crimped in this way, even if the joint is roughly joined or bonded, it will not be possible to obtain a sufficient airtight seal, and the strength will also be poor.

There is no particular upper limit to the width of the metal plate material, but according to experiments by the present inventors, it is 0.7 to 0.8 times the punch circumference,
It has been found that 0.6 times or less is more optimal. In other words, it may vary depending on the specific dimensions of the punch, the material, etc., or the width of the metal plate material is 0.7 to 0.7 of the circumference of the punch.
If it exceeds 0.8 times, the metal plate material will break at the R part of the boundary between the tip of the punch and the wall (therefore, the R part of the boundary between the bottom and wall of the bottomed cylindrical body) during deep drawing. In addition, the depth of the molded product may become shallow, making it impossible to obtain a bottomed cylindrical body with the required depth. Therefore, the width of the metal plate material is 0.7 of the circumference of the punch.
It is preferable to set it to about 0.68 times or less, more preferably 0.6 times or less.

Detailed explanation for carrying out the invention Fig. 1 shows an example of the arrangement of the punch 1 and die 2 for carrying out the method of the invention, and Figs. 2 (A) and (B)
3 respectively show an example of the cross-sectional shape of the punch 1, and FIG. 3 roughly shows the bottomed cylindrical body 4 obtained by the method of the present invention.
An example is shown below.

As shown in FIG. 2 (A) or FIG. 2 (B), the punch 1 has a cross-sectional shape of an oval shape (ellipse) or an oblate circular shape represented by an oval shape. The shape is not limited to a shape or an oval shape, and a shape similar to these may be used. On the other hand, the die 2 has a die hole 2A corresponding to the cross-sectional shape of the punch 1, and the dimensions of the die hole 2A are determined based on the thickness and material of the metal plate material 3 to be formed into the bonder 1. Set to maintain balance.

To actually perform the forming process, as shown by the chain line in Fig. 1, a rectangular metal plate 3 made of aluminum alloy or the like is placed so that its center 0 coincides with the center axis P of the punch 1 - die 2 and the metal Short side 31 cut in the width direction of the plate material 3
is arranged on the die 2 so that it is parallel to the oblate circular length 'f' [lIQ of the cross section of the punch 1, and the punch 1 is moved downward to perform deep drawing. Although not particularly shown in the drawings, it is of course possible to use a perforation presser, a knockout pin, etc. used in deep drawing of clothes.

In addition, here, as the metal plate wood 3, the short side 3 along the width direction
The length Ll of the punch 1 is more than 0.5 times the circumferential length of the punch 1 and preferably 7 to 0.8 times or less, more preferably 0.6 times or less the circumferential length of the punch 4. Further, the length Ll of the long side 32 of the metal plate material 3 may be appropriately determined depending on the depth of the bottomed cylindrical body to be created. In other words, the length of the long side 32 is determined to be the sum of twice the depth of the cylindrical body to be obtained, the length of the cross section of the punch 1 in the short axis direction, and the length of the margin for trimming, etc. Just leave it there.

The molded product obtained by the drawing process as described above is
As shown in the figure, it forms a bottomed cylindrical body 4 having a flat circular cross section and a required depth, and the bottomed cylindrical body 4 has both ends in the length direction (long axis direction) of the flat circular cross section. wall 4
1, a seam 45 that is continuous from a midway position 44 to the opening 43 between the bottom surface 42 and the opening 43;
is formed. Note that this seam 45 is crimped in abutted state as described above.

The bottomed cylindrical body 4 obtained in this way may be manufactured as a container, a strength member, etc. as it is, and in some cases, the seam 45 may be roughly joined by welding, brazing, etc., or by gluing. The airtightness may be further improved by adhesion by agent coating or the like.

Example: A soft aluminum plate with a thickness of 0.8 mm was deep drawn for 12 tons using punch-die tools A and B of two sizes having oval cross-sectional shapes as shown in Figure 2 (A>). Deep drawing was performed using a testing machine.The dimensions of the two types of tools A and B used are as shown in Table 1.
r, w in the table.

! , are as shown in FIG. 2(A), r is the punch shoulder radius, rd is the die shoulder radius, and C is the roll balance between the die and the punch.

Table 1 (Unit: mm) The shape of the material is rectangular, the width in the rolling direction is Ll, the length in the direction perpendicular to the rolling direction is Ll, and the direction of Ll is the long axis direction of the cross section of the punch 4. parallel. The value of Ll (width of the short side) is 80n1m for tool A, and 80n1m for tool B.
In this case, it was set to 70 mm. Therefore, in the case of a tool, the width L1 of the material is about 0.55 times the circumference of the punch, and in the case of tool B, the width L1 of the material is about 0.53 times the circumference of the punch.

In addition, as a lubricant, commercially available mineral press oil was applied to the entire surface of the material, and a wrinkle presser was used to hold the material with a pressing force of 200.
It was set to 111J.

Under the above conditions, when tool A is used, the long side length L2 of the material is varied within the range of 100 to 300 mm, and when tool B is used, the long side length L2 of the material is varied from 70 to 300 mm. 2
To obtain a bottomed cylindrical body with an oval cross section as shown in Fig. 3 having various depths without causing material breakage by performing drawing processing with various changes within the range of 0.00 mm. was completed. In both cases, it was found that the seams were well crimped.

Effects of the Invention As is clear from the above explanation, according to the method of this invention,
A bottomed cylindrical body with an oblate circular cross section having an arbitrary depth is
It can be easily and easily obtained by multiple molding processes, and therefore the manufacturing cost of a bottomed cylindrical body with this type of shape can be significantly reduced. .

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an example of a die-punch used in the method of this invention, and FIGS. 2 (A> and (B) are examples of cross-sectional shapes of punches used in the method of this invention, respectively) 3 is a perspective view showing an example of a bottomed cylindrical body obtained by the method of the present invention. 1...Punch, 2...Dice, 3...Metal plate material , 4... Bottomed cylindrical body, 45... Seam.

Claims (1)

[Claims] A substantially rectangular flat metal plate material having a width exceeding 0.5 times the circumference of the punch is placed between a punch and a die having an oblate circular cross section, and the center of the metal plate material and the die are placed between the die and the punch. , and the width direction of the metal plate material is parallel to the length direction of the oblate circular cross section of the die, and the metal plate material is subjected to one flat drawing process using the die and punch. By doing so, it has a bottomed cylindrical shape with a flat circular cross section and the required strength, and the walls at both ends in the length direction of the flat cross section are formed from a midway position between the bottom surface and the open end. A method for producing a bottomed cylindrical body having a flat circular cross section, the method comprising obtaining a bottomed cylindrical body having a continuous seam throughout.