JPH09314263A - Two-piece seamless aluminum can, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can in which the service range of the aluminum alloy to be used is expanded to the high strength material and the bulge workability is excellent. SOLUTION: An aluminum can body mainly consists of aluminum containing, by weight, 0.05-1.5% Si, 0.05-1.0% Fe, 0.2-5.5% Mg, 0.35-0% Cu, 2.0-0% Mn, the minimum thickness of a side wall part of the can body is 0.06-0.16mm, and the minimum thickness of the can body part is <=70% of the thickness of an original sheet, and the can body ultimate deformation capacity εw to be defined as εw=1n(tb/tw), is εw<=0.06F-2.1, where F is the maximum tensile load (kgf), tb is the thickness (mm) of a ductile fracture surface of the test piece obtained from the measured value of the test piece of 6mm in width of a parallel part, and tw (mm) in thickness in which the circumferential direction of the can obtained from the can body in the vicinity of H/2 is the longitudinal direction where H is the can height (mm), and the direction orthogonal to the rolling direction of can bottom is the center, and a two-piece seamless aluminum can body comprising the can body wall in which 15<=f<30, and εw<=-0.7, and the present invention also relates to a manufacturing method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can body containing aluminum as a main component and excellent in workability, and a method for producing the can body. The can body of the present invention is suitable for bulging.

[0002]

2. Description of the Related Art Conventionally used aluminum alloys for ADI cans are limited to 1000 series or 3000 series, and the material ear ratio is 3.5 to 4%.
It must be as small as possible, and the bottom shape of the can was limited to a certain range. Further, in order to bulge the can body portion after ADI molding, by keeping the plate thickness of the can body side wall thick and at the same time heating the can body to at least 350 ° C. by annealing or the like, It was necessary to modify and soften the metal structure.

[0003]

According to the present invention, various shapes can be selected for the bottom of the can, the range of usable aluminum alloys is expanded to high-strength materials, the material ear ratio is wide, and the side wall of the can body is wide. A two-piece seamless aluminum can body that can be bulged without undergoing a can body side wall reforming process by heating at a high temperature such as annealing even if the plate thickness of the part is thin.

[0004]

Means for Solving the Problems The present invention provides "1. Si 0.05 to 1.5 wt% Fe 0.05 to 1.0 wt% Mg 0.2 to 5.5 wt% Cu 0.35. ˜0 wt% Mn 2.0 to 0 wt% is the main component of aluminum, the minimum metal thickness of the can body side wall is 0.06 to 0.16 mm, and the minimum body thickness of the can body is that of the original plate. A can body having a plate thickness of 70% or less, and a can body near H / 2 with respect to the can height Hmm, in which the circumferential direction of the obtained can is the longitudinal direction and the direction perpendicular to the rolling direction of the can bottom is the center. From the measured values of the maximum tensile load F kgf and the metal thickness tbmm of the ductile fracture surface of the test piece, εw = ln (tb / tw)
Can barrel ultimate deformability εw is defined as εw ≦ 0.0
6F-2.1, 15 ≦ F <30 and εw ≦ −
A two-piece seamless aluminum can with a can body wall of 0.7. 2. Can body ultimate deformability εw is εw ≦ 0.06F-2.
The two-piece seamless aluminum can body according to item 1, which is 25. 3. Can body ultimate deformability εw is εw ≦ 0.06F-2.
45 is a two-piece seamless aluminum can body according to item 1 or 2. 4. The two-piece seamless aluminum can body according to any one of items 1 to 3, wherein the ultimate can deformability εw is εw ≦ −0.86. 5. Mn 0.5 wt% or less Mg 0.8 to 5.5
The two-piece seamless aluminum can body according to any one of items 1 to 4, which contains aluminum as a main component in a weight percentage. 6. The two-piece seamless aluminum can body according to any one of items 1 to 5, wherein the original plate has a maximum tensile strength of 25 to 45 kg / mm ² . 7. Aluminum containing Si 0.05 to 1.5% by weight Fe 0.05 to 1.0% by weight Mg 0.8 to 5.5% by weight Cu 0.35 to 0% by weight Mn 0.5 to 0% by weight A can body containing as a main component,
A tensile test piece having a width of 6 mm in the parallel portion, which was created with the direction perpendicular to the rolling direction of the original plate having a metal thickness of t0 wmm as the longitudinal direction, has a maximum tensile strength of TS kg / mm ² , and the measured value of the metal thickness tbmm of the ductile fracture surface of the test piece. , Ε0 = ln (tb / t0), the ultimate deformability ε0 of the original plate is ε0 ≦ 0.06TS-3, and 25 ≦ TS ≦ 45. A two-piece seamless aluminum can body having a minimum plate thickness of 70% or less of the original plate thickness. 8. The two-piece seamless aluminum can body according to any one of items 1 to 7, wherein the can body is a can body formed of an aluminum alloy original plate having both surfaces coated with a crystalline thermoplastic resin. 9. The two-piece seamless aluminum can body according to any one of items 1 to 8, wherein a bulge process is performed to form an overhanging portion on the body. 10. Mainly aluminum containing Si 0.05 to 1.5 wt% Fe 0.05 to 1.0 wt% Cu 0.35 to 0 wt% Mn 2.0 to 0 wt% Mg 5.5 to 0 wt% 0.2-0.8 as an ingredient
An aluminum original plate having a plate thickness of mm is subjected to drawing and ironing in one step. Simultaneous drawing and ironing processing steps are performed several times to form a can body side wall thickness of 0.06 to 0.16 mm and a flange thickness of 0.10 to
Equivalent strain of 0.20 mm εeq = √ {2/3 (ε
t ² + εθ ² + εφ ² )} (εt: strain in plate thickness, εθ: strain in circumferential direction, εφ: strain in axial direction of can barrel), when the original plate is set to 0, the maximum strain on the can barrel is 0.8. A method for producing a two-piece seamless aluminum can body having both sides coated with a crystalline thermoplastic resin, wherein 11. The method for producing an aluminum can body according to item 10, wherein the maximum strained portion in the can body is 1.2 to 2.0. 12. 1. The can making process does not include a forming process of drawing alone or ironing alone.
A method for producing a two-piece seamless aluminum can body according to item 0 or 11. About.

In the present invention, as an aluminum original plate, Si 0.05 to 1.5% by weight Fe 0.05 to 1.0% by weight Mg 0.2 to 5.5% by weight Cu 0.35 to 0% by weight Mn 2 An aluminum original plate containing 0.0 to 0% by weight is used. Si is 0.0
A content of 5% by weight or less is unsuitable for industrial use because it is not available as an industrial material, and a content of 1.5% by weight or more is not preferable because the workability is deteriorated and the corrosion resistance is poor. Fe is 0.05
If it is less than 10% by weight, it cannot be obtained as an industrial material and is unsuitable for industrial use.
Corrosion resistance is also poor, which is not preferable. Cu is 0.35% by weight
The above is not preferable because the corrosion resistance is inferior. Mn is 2.0
If it is more than 10% by weight, the intermetallic compound becomes coarse and flange cracks easily occur, which is not preferable. 5.5 for Mg
If it is more than 0.2% by weight, the workability is deteriorated, and if it is less than 0.2% by weight, the strength is insufficient.

The minimum metal thickness of the side wall of the can body is 0.06 to
The limitation to 0.16 mm is that if the minimum metal thickness of the side wall of the can body is smaller than 0.06 mm, the axial strength in the can height direction is weak and the can buckles during winding. If the minimum metal thickness of the side wall of the can body is larger than 0.16 mm, the can body becomes heavy and the amount of material used is large, which is contrary to the gist of the present invention. For the same reason, the reason that the minimum plate thickness of the can body wall is limited to 70% or less of the plate thickness of the original plate is from the viewpoint of the weight of the can and the amount of material used. The test piece is sampled so that the circumferential direction of the can is the longitudinal direction from about 1/2 of the can height and the center is in the direction perpendicular to the rolling direction of the can bottom. It is a part that represents the properties of the can, and the circumferential direction of the can is the part where the strain due to processing from the original plate is constant, and the test piece should be taken so that the center is in the direction perpendicular to the rolling direction of the can bottom. In many cases, the εw of the can body is the smallest, that is, the direction in which the deformability is highest. For the same reason, the ultimate deformability of the original plate is measured by taking a tensile test piece with the longitudinal direction being the direction perpendicular to the rolling direction of the original plate.

The smaller the can body ultimate deformability εw or the original plate ultimate deformability ε0, the better the overall deformation characteristics. Especially when compared with the same plate thickness, it is difficult to break at bending deformation, stretch flange formability and shrinkage. It means that it is excellent against various deformations such as diameter workability. Therefore, when εw ≦ −0.7, not only the bulge workability but also the general deformation characteristics of the can body portion are excellent, and when εw ≦ −0.86, more excellent performance is exhibited. At this time, even if εw of the can body is large to some extent, a material having a large tensile load F can be deformed by performing bulging while applying a compressive load in the can height direction. At this time, it is preferable that εw ≦ 0.06F-2.1 because the deformation characteristics are high and the bulge workability is improved. Particularly, εw ≦ 0.06F-2.25 is more preferable because the deformation characteristics are higher and the bulge workability is improved, and εw ≦ 0.06F-2.45 is particularly excellent in the deformation characteristics, and the bulge workability and It is most preferable because the impact resistance becomes very excellent.

Further, the reason for limiting F ≦ 30 is that the minimum metal thickness of the side wall of the can body is limited to 0.06 to 0.16 mm, but in addition to the plate thickness factor, the strength of the can body wall is limited. Taking into account
It shows the conditions that are highly economical in terms of the amount of can body material used. Further, it is preferable that 15 ≦ F from the viewpoint of container rigidity, and if 15 ≦ F ≦ 30, there is rigidity,
Moreover, it is the most preferable because it is an excellent container in terms of the amount of materials used such as the weight of a can. If the tensile strength of the original plate is 45 kg / mm ² or more, it is difficult to process it into a can body, and if it is 25 kg / mm ² or less, it becomes necessary to use a thick original plate to ensure the pressure resistance required for the can body. This is not preferable because the weight of the can becomes large.

Also, Original plate ultimate deformability is ε0 ≦ 0.06T
When S-3 and 25 ≦ TS ≦ 45, there is an advantage that an action having a can body wall having both moldability from a raw plate to a can body, bulge workability of the can body, and impact resistance is exhibited. . 0.2
~ 0.8 mm plate thickness of aluminum original plate is simultaneously drawn and ironed, and the minimum metal thickness of the can body side wall is 0.06 ~
0.16 mm, flange thickness 0.10 to 0.20 mm and equivalent strain εeq = √ {2/3 (εt ² + εθ ² +
εφ ² )} (εt: plate thickness strain, εθ: circumferential strain, ε
φ: strain in the axial direction of the can body)
A method for producing a two-piece seamless aluminum can body characterized in that the maximum strained portion of the can body is 0.8 to 2.5. When the maximum strained portion of the can body is 0.8 or less, the plate of the can body portion relative to the bottom of the can body. 0.8 to 2.5 is required because the thinning ratio of thickness is small, the amount of material used is large, and the container is heavy and uneconomical. 1.2-2.0 are the most preferable.

One of the features of the present invention is that the can body has a special can body ultimate deformability. Explaining the test piece taken from the can body, FIG. 3 shows the tensile strength of the test piece. The test shows a half cut in the middle. The thickness of the body is tw, and the thickness of the part cut by the tensile test is t.
b. tb is the ductile fracture surface, that is, the thickness of the portion where the ductile dimple fracture surface is present in the entire plate thickness direction when observed with a scanning electron microscope. The ultimate deformability εw of the can body is represented by εw = ln (tb / tw). It is expressed by the natural logarithm of the ratio of the plate thickness of the can body to the plate thickness at the cut point. The tensile test results are
When the plate thickness is very thin, the chuck speed is 0.5 to 1.2 because it depends on the pulling speed.
It is necessary to perform the test at a speed of mm / min.

The ultimate deformability and tensile strength of the original aluminum plate will be described. Line 1 shown in FIG. 1 is ε0 = 0.0
It is a straight line of 6TS-3, and in the region below this straight line, the bulge workability and the impact resistance after forming the can body are particularly excellent. The straight line 2 is a straight line of TS = 25, and the right side of this straight line is a range where good pressure resistance can be obtained without using a thick original plate. Further, the straight line 3 is a straight line of TS = 45, and the region on the left side of this line is a region where the formability from the original plate to the can is good. Therefore, when the original plate has 25 ≦ TS ≦ 45 and the ultimate deformability of the original plate of ε0 ≦ 0.06TS-3, the original plate has good moldability, good pressure resistance, and good bulge workability. It becomes possible to form a can body having particularly excellent impact resistance. A to L shown in FIG. 1 represent the aluminum alloy original plates shown in Table 1. Therefore, the aluminum alloy original plate A shown in Table 1 has an ultimate deformability ε = −.
1, the maximum tensile strength TS was 30 kg / mm ² .

Next, FIG. 2 shows the relationship between the tensile load and the ultimate deformability of the can body. The straight line 1 is a straight line of εw = 0.06F-2.1, and the region below this straight line is a region having good bulge workability. Further, the straight line 2 is a line of F = 15, and the right side of this line is a region where the container rigidity is excellent. Line 3 has εw =-
The line is 0.7, and the region below this is a region with good deformation performance. The straight line 4 is a line of F = 30, which is a line showing the economical efficiency of the amount of the metal material used in terms of the weight of the can. The left side of this line is a line with excellent economic efficiency. The broken line 5 is a line of εw = −0.86,
The broken line 6 is a line of εw = 0.06F-2.25, the broken line 7 is a line of εw = 0.06F-2.45, and the deformation performance is generally excellent below the broken line 5 and below the broken line 6. In particular, the bulge workability is good, and particularly below the dotted line 7, excellent bulge workability and impact resistance are exhibited. Therefore, F =
15, F = 30, εw = 0.06F-2.1, εw =-
If there is a can barrel ultimate deformability in the area surrounded by the line of 0.7,
It can be seen that the bulge workability is excellent and the excellent can has a small amount of metal material used. Furthermore, the ultimate deformability of the can body is F = 1.
5 and the line of F = 30, the line of (epsilon) w = -0.7, and (epsilon) w = 0.
The area surrounded by the broken line of 06F-2.25 is more preferable, and in particular, the can body ultimate deformability is F = 15 and F = 30.
Line, εw = −0.86 line, εw = 0.06F−
The region surrounded by the broken line of 2.45 is the most preferable. A, B1, B2, C, F, G, L, H, and I shown in FIG. 2 are can body codes shown in Table 2. Therefore, the can A has a can barrel ultimate deformability ε = −0.85 and a tensile load F≈24 kgf.

In the present invention, the original plate is more preferably coated with a crystalline thermoplastic resin having a thickness of 5 to 50 μm. Thermosetting paints conventionally used for DI cans have poor workability, and metal exposure is likely to occur during can forming or bulging. Further, even when spray coating is performed after bulging, paint accumulation easily occurs and efficiency deteriorates. The coating method includes laminate or extrusion coating, and as the crystalline thermoplastic resin, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic ester copolymer, ionomer, etc. Olefin resin film; polyethylene terephthalate,
Examples thereof include polyesters such as polybutylene terephthalate and ethylene terephthalate / isophthalate copolymers; polyamides such as nylon 6, nylon 6,6, nylon 11 and nylon 12; polyvinyl chloride: polyvinylidene chloride. Further, from the viewpoint of appearance, the resin may contain an inorganic pigment. The original plate coated with the above resin preferably has a chemical conversion treatment layer on its surface in order to maintain the adhesiveness and corrosion resistance after can forming or bulge processing in a better state. In addition to workability, it is particularly important for the chemical conversion coating to have water resistance or corrosion resistance. For example, chromate phosphate, which has been conventionally used as a chemical conversion treatment for coating substrates, or oxidation of zirconium or titanium. There are chemical conversion coatings mainly composed of substances, or composite coatings of polyacrylic acid-zirconium salt. The coating amount is Ti, C as the metal content.
When r and Zr are included, the amount of the metal is preferable, and when the metal element is not included, the amount of C is preferably about 5 to 300 mg / m ² .

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has a plate thickness of 0.2 to 0.8 mm.
More preferably, an aluminum plate of 0.2 to 0.4 mm is used to perform simultaneous drawing and ironing forming a plurality of times, and the minimum thickness of the can body side wall portion is 0.06 to 0.16 mm and the flange thickness is 0.10. ~ 0.20 mm, equivalent strain εeq = √2
/ 3 (εt ² + εθ ² + εφ ² ) logarithmic display 0
Then, the maximum strained portion in the can body is 0.8 to 2.5, and preferably 1.2 to 2.0.

In the simultaneous drawing and ironing method, a punch, a wrinkle retainer and a die are used, and the punch is advanced while pressing the peripheral portion of the material on the die surface with the wrinkle retainer, and a part of the material forming the can body. While squeezing at the drawing corner, at the ironing ring part connected to the front end of the corner,
This is a method of ironing the other part of the material of the can body in cooperation with the drawing process, in which the drawing process and the ironing process proceed simultaneously. By repeating such simultaneous drawing and ironing process multiple times, the can Manufacture the body. In the conventional DI processing method used for can manufacturing, a part of the material forming the can body is squeezed, but at the same time, the other part is not ironed. By this processing method, a high strength aluminum original plate, which was impossible by the conventional DI processing method, can be made into a can body. Another feature of the present invention is that the simultaneous drawing and ironing process in which the drawing process and the ironing process proceed simultaneously is repeated a plurality of times. By this step, a can body with small ears and high roundness can be formed even if the material has large anisotropy.
In particular, the effect is remarkable when the drawing process and the ironing process alone are not included in the plurality of can forming processes. Note that these processes can be performed by dry lubrication. That is, the liquid coolant as used in the known DI can manufacturing is not used, and the one side 50
For example, paraffin wax, white petrolatum, or palm oil of about mg / m ² can be applied as a lubricant and used for molding. The molded can body has, for example, 88 mol% of polyethylene terephthalate and 12 parts of polyethylene isophthalate in order to alleviate the distortion of the coating resin generated by the molding.
When using a base plate coated with a biaxially stretched film of a copolymerized polyester resin consisting of mol%, heat treatment is performed at 220 ° C. for about 30 seconds, and then the opening end is trimmed and printed and finished according to a conventional method. Performs varnish coating, baking, neck-in and flange processing.

An example of bulging will be described with reference to FIG. 1
Is a can for processing. 2 is a bulge mold, and can 1
While the axial load is applied from the can bottom to the can height direction, the expansion pressing tool 3 is expanded by water pressure to process the can body from the inside and press the bulge forming die. In this way, bulge processing can be performed.

[0017]

EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples to clarify the effects. Table 1 shows the aluminum alloy original plate used.

[0018]

[Table 1]

Example 1 Using an aluminum alloy original plate A shown in Table 1, an inner diameter of 66 m
A m having a height of 122 mm was DI-molded. The original plate is a plate without a resin coating. In DI molding, after drawing by a conventional method, redrawing, three-stage ironing, and a can were made by steps. A finishing varnish was applied and baked to give slipperiness on the surface, and an epoxy acrylic paint was sprayed on the inner surface and baked to obtain a can.

Example 2 Simultaneous drawing and ironing using a base plate B whose inner surface was coated with a biaxially stretched film of a copolyester resin composed of 88 mol% polyethylene terephthalate and 12 mol% polyethylene isophthalate on the inner surface by heat fusion. did.
Simultaneous drawing and ironing was carried out by repeating the drawing and ironing process using the above original plate three times to make a can. After canning, heat treatment was performed at 220 ° C. for 30 seconds in order to remove the distortion of the resin film.
A finishing varnish was applied and baked to give a slip to the surface of the can to obtain a can.

Example 3 A can was prepared in the same manner as in Example 2 except that the can was made into a cup formed by drawing and the ironing process was repeated twice to carry out single ironing.

Example 4 A can was made in the same manner as in Example 2 except that C was used as the original plate.

Example 5 A can was made in the same manner as in Example 2 except that F was used as the original plate.

Example 6 A can was made in the same manner as in Example 2 except that G was used as the original plate.

Example 7 A can was made in the same manner as in Example 2 except that L was used as the original plate.

Comparative Example 1 A can was made in the same manner as in Example 2 except that H was used as the original plate.

Comparative Example 2 A can was made in the same manner as in Example 2 except that I was used as the original plate. Table 2 shows the results of the performance tests of the cans obtained in the examples and the comparative examples.

[0028]

[Table 2]

Here, tw is the metal plate thickness of the side wall of the can body. From about 1/2 of the height from the bottom of the can to the opening of the can, a tensile test piece with a grip width of 16 mm, a parallel width of 6 mm, and a parallel length of 25 mm was used. It was made so as to be centered, and using a load cell of 100 kg, 1 mm / min. A tensile test was performed at a chuck speed of. Further, the test piece after tensile rupture was observed with a scanning electron microscope to obtain the width tb of the fracture surface of the ductile dimple,
The ultimate deformability εw of the can body was obtained by calculation. Also, with respect to the can body prepared under the same conditions as those used for collecting the tensile test pieces, 5%, 6%, 7% of the can diameter was applied while applying an axial load.
% Of the mold was pressed by an expansion pressing tool to evaluate the bulge workability.

The can bodies of Examples 1, 2, 3, and 4 in Table 2 are
εw ≦ 0.06F−2.25 was satisfied, and 6% overhang was possible. Further, in Examples 5, 6, and 7, εw ≦ 0.
06F-2.45 was satisfied, and 7% overhang was possible. The can bodies of Examples 5, 6, and 7 were prepared by cutting 90 mm square test pieces and applying vaseline so that the center of the can body was about 1/2 height in the direction perpendicular to the rolling direction of the original plate. , JIS K5400 6.13 Placed on an impact deformation tester, place an aluminum jig with a hole in the center of the tester frame and fix it so that it does not move except the center of the test piece Then, a weight with a mass of 300 g was dropped from the height of 40 cm to the center, but it was deformed without breaking.

With respect to cracking of the coating film, the can body of Example 1 spray-coated with an epoxy acrylic paint after DI molding and the can body of Example 2 prepared from a master plate coated with a polyester resin at a can temperature of about 85 ° C. It performed 5% stretch forming _{respectively, CuSO 4 · 5H 2 O15g /} 1, H 2 SO 4
A 0.75 g / 1 aqueous solution was placed in a can, a stainless steel rod was used as an anode, and the can was used as a cathode, and electricity was applied for several seconds. The copper deposition state after opening the can was compared. Was excellent. Regarding the εw after the overhanging process, in the can body of Example 5, after the 7% overhanging process, a test piece was prepared by the same method as described above and a tensile test was performed, and the ultimate deformability εw of the can body was obtained. However, εw ≦ 0.06F−2.45 was satisfied even after the overhanging process. Looking at the workability of the neck, a 90 mm square test was conducted on the can bodies of Examples 1, 2, and 3 so that the portion near the height 1/2 of the can was centered in the direction perpendicular to the rolling direction of the original plate. A piece was cut out, a circular hole with a diameter of 10 mm was made in the center, and a hole expansion test was conducted using a conical punch. As a result, εw ≦ −0.8
B1 satisfying 6 was superior to A, B2, and K in hole expansibility. However, the metal thickness tF at the top of the can is 1
When the diameter of the neck portion was reduced to 56 μm and the diameter of the neck portion was reduced so that the opening diameter of the upper portion of the can was 52 mm, evaluation was made.

Regarding the ear ratio and the workability, the base plate B shown in Table 1 having the ear ratios of 3.2% and 6.8%, respectively,
Using F, a can having an inner diameter of 66 mm and a can height of 122 mm was subjected to DI molding in the same manner as in Example 1, and was compared. As a result, B was able to be made, but F having high tensile strength was crushed during can making. Both sides of the original plates B and F were coated with a 12 μm-thick copolymer PET film in the same manner as in Example 1, and after drawing, simultaneous drawing and ironing were repeated twice to obtain an inner diameter of 66 mm and a can height of 122 mm. When a can was made, F had a large edge ratio of the original plate, but the can was made, but the roundness of the opening was extremely poor and B was good. Similarly, both sides have a thickness of 12 μm
Using the original plates E and F coated with the above-mentioned copolymer PET film, a can having an inner diameter of 66 mm and a can height of 122 mm was prepared by simultaneously drawing and ironing three times, and both materials had good roundness. It became an excellent can.

When Comparative Examples 1 and 2 were evaluated in the same manner as in Example 1, they broke at the time of 5% overhang. Further, the neck workability was also poor, and when the metal wall thickness tF of the upper part of the can was set to 156 μm and the diameter reduction processing was performed so that the opening diameter was 52 mm, fracture occurred during neck forming. Furthermore, when the above-mentioned impact deformation test was conducted, it broke.

[0034]

INDUSTRIAL APPLICABILITY According to the present invention, the workability is good, various shapes can be selected for the bottom of the can, the range of aluminum alloys that can be used is expanded to high strength materials, and the material ear ratio can be widened to overhang. It has good effect and has an excellent effect as a bulge processing can.

[Brief description of drawings]

FIG. 1 is a graph showing the original plate ultimate deformability.

FIG. 2 is a graph showing the ultimate deformability of a can body.

FIG. 3 is an explanatory diagram of a cut test piece.

FIG. 4 is an explanatory diagram of bulge processing.

[Explanation of Codes] 1 Can for processing 2 Bulge forming die 3 Expansion pressing tool

Front page continuation (72) Inventor Katsuhiro Imazu 6205-1, Izumi-cho, Izumi-ku, Yokohama-shi, Kanagawa

Claims (12)

[Claims] 1. Si 0.05 to 1.5% by weight Fe 0.05 to 1.0% by weight Mg 0.2 to 5.5% by weight Cu 0.35 to 0% by weight Mn 2.0 to 0% by weight % Of aluminum as a main component, the minimum metal thickness of the side wall of the can body is 0.06 to 0.16 mm, and the minimum thickness of the can body is 70% or less of the thickness of the original plate. Therefore, from the can body near H / 2 to the can height Hmm, the circumferential direction of the obtained can is the longitudinal direction, and the center is in the direction perpendicular to the rolling direction of the can bottom. From the measured value of the maximum tensile load F kgf and the metal thickness tbmm of the ductile fracture surface of the test piece, εw = ln (tb / tw)
Can barrel ultimate deformability εw is defined as εw ≦ 0.0
6F-2.1, 15 ≦ F <30 and εw ≦ −
A two-piece seamless aluminum can with a can body wall of 0.7. 2. A can barrel ultimate deformability εw is εw ≦ 0.06.
The two-piece seamless aluminum can body according to claim 1, which is F-2.25. 3. The ultimate deformability εw of the can body is εw ≦ 0.06.
F-2.45, 2 according to claim 1 or 2
Peace seamless aluminum can body. 4. The ultimate deformability εw of the can body is εw ≦ −0.8.
The two-piece seamless aluminum can body according to any one of claims 1 to 3, which is 6. 5. The aluminum-based material having a Mn of 0.5% by weight or less and a Mg content of 0.8 to 5.5% by weight as a main component.
The two-piece seamless aluminum can body described in any one of 1. 6. The maximum tensile strength of the original plate is 25 to 45 kg /
The two-piece seamless aluminum can body according to any one of claims 1 to 5, which has a size of mm ² . 7. Si 0.05 to 1.5% by weight Fe 0.05 to 1.0% by weight Mg 0.8 to 5.5% by weight Cu 0.35 to 0% by weight Mn 0.5 to 0% by weight A can body containing aluminum as a main component containing
A tensile test piece having a width of 6 mm in the parallel portion, which was created with the direction perpendicular to the rolling direction of the original plate having a metal thickness of t0 wmm as the longitudinal direction, has a maximum tensile strength of TS kg / mm ² , and the measured value of the metal thickness tbmm of the ductile fracture surface of the test piece. , Ε0 = ln (tb / t0), the ultimate deformability ε0 of the original plate is ε0 ≦ 0.06TS-3, and 25 ≦ TS ≦ 45. A two-piece seamless aluminum can body having a minimum plate thickness of 70% or less of the original plate thickness. 8. The two-piece seamless aluminum according to any one of claims 1 to 7, wherein the can body is a can body formed from an aluminum alloy original plate having both sides coated with a crystalline thermoplastic resin. Can body. 9. The two-piece seamless aluminum can body according to any one of claims 1 to 8, wherein a bulge process is performed to form an overhanging portion on the body portion. 10. Si 0.05 to 1.5 wt% Fe 0.05 to 1.0 wt% Cu 0.35 to 0 wt% Mn 2.0 to 0 wt% Mg 5.5 to 0 wt% 0.2 to 0.8 containing aluminum as a main component
An aluminum original plate having a plate thickness of mm is subjected to drawing and ironing in one step. Simultaneous drawing and ironing processing steps are performed several times to form a can body side wall thickness of 0.06 to 0.16 mm and a flange thickness of 0.10 to
Equivalent strain of 0.20 mm εeq = √ {2/3 (ε
t ² + εθ ² + εφ ² )} (εt: strain in plate thickness, εθ: strain in circumferential direction, εφ: strain in axial direction of can barrel), when the original plate is set to 0, the maximum strain on the can barrel is 0.8. A method for producing a two-piece seamless aluminum can body having both sides coated with a crystalline thermoplastic resin, wherein 11. The maximum strained portion in the can body is 1.2 to 2.
The method for producing an aluminum can body according to claim 10, wherein the method is 0. 12. The method for producing a two-piece seamless aluminum can body according to claim 10 or 11, wherein the can-making step does not include a drawing step alone or an ironing step alone.