JPH09225547A - Production of bottomed circular cylindrical vessel with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a bottomed circular cylindrical vessel with a flange from a different kinds of metal clad sheet. SOLUTION: This is a producing method of a bottomed circular cylindrical vessel with a flange with deep drawing from different kinds of clad sheet, and spinning is executed after previous press-forming. The drawing depth (h) in this press forming is preferably made within the range larger than a radius R1 of punch shoulder part and less than 0.8 times the punch diameter (d). Further, the radius R1 of punch shoulder part is preferably made more than five times the plate thickness (t) and the radius R2 of a die shoulder part is preferably made more than four times as large as the plate tickness (t). Further, spinning is preferably executed from the bottom corner radius part of the press forming material over the side wall part or from the bottom corner radius part over the side wall part and the flange part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a bottomed cylindrical container with a flange from a clad plate of dissimilar metal, for example, a clad plate obtained by laminating aluminum and stainless steel.

[0002]

2. Description of the Related Art Dissimilar metal clad plates, for example, dissimilar metal clad plates in which a non-ferrous metal and a steel material are superposed are manufactured by joining by an explosive deposition method or a rolling method, and various industrial properties are utilized by utilizing the characteristics of each metal. It has been used in products and household cooking containers. Among them, the clad plate made of aluminum and stainless steel (hereinafter referred to as "aluminum-stainless clad plate") is lightweight, capable of electromagnetic cooking, and excellent in heat conductivity, heat retention and corrosion resistance. Therefore, it is used as a material for high-class houseware such as pots.

The aluminum-stainless clad plate includes a two-layer clad plate made of aluminum and stainless steel, and a three-layer clad plate in which aluminum is sandwiched between two pieces of stainless steel.

A bottomed cylindrical container with a flange is a container manufactured by deep-drawing a plate material, for example, a cooking pot having a substantially constant inner diameter in the depth direction,
The ratio of the inner diameter to the depth is about 1 or less.

FIG. 2 is a schematic vertical cross-sectional view of a bottomed cylindrical container with a flange, where (a) is a bottomed cylindrical container with a flange made of a single plate (raw plate), and (b) is a two-layered container. A bottomed cylindrical container with a flange made of a clad plate, and (c) a bottomed cylindrical container with a flange made of a three-layer clad plate. A bottomed cylindrical container with a flange according to the present invention has an inner diameter D that is substantially constant in the depth direction, such as a cooking pot, and has a ratio (H / D) of the inner diameter D and the depth H. Almost 1 (0.8 or more,
It is preferably 0.9 or more).

Generally, a bottomed cylindrical container with a flange is manufactured by a deep drawing forming method using a press or a spinning processing method using a roller or a whisk.

FIG. 3 is a vertical cross-sectional view showing the relationship between a blank and a tool during deep drawing by pressing a bottomed cylindrical container with a flange. (A) is a situation before drawing and (b) [Fig. 4] is a diagram illustrating a situation during drawing processing. Here, the code M
Is a blank plate, 2 is a punch for press molding, 3 is a die for press molding, and 4 is a metal fitting for holding the peripheral portion of the blank plate.
As shown in the figure, the blank M is placed on the press-molding die 3, and the periphery of the blank is pressed by the metal fittings 4, and the punch is pressed.
A bottomed cylindrical container with a flange is manufactured by pushing down from the center upper surface of the blank plate in step 2 and drawing.

When a bottomed cylindrical container with a flange is molded from an aluminum-stainless steel clad plate by a deep drawing method using a press molding machine shown in FIG. 3, it breaks during the molding or wrinkles are generated on the flange, resulting in a product. I won't. Further, when formed by spinning, the difference in deformation resistance between both materials is large, so the ratio of the depth H of the container to the inner diameter D (H /
It often breaks when D) is 2/3 or more.

In order to manufacture a bottomed cylindrical container with a flange by press forming or spinning from a material having poor formability or a clad plate obtained by joining mild steel and stainless steel, before and during forming, A softening heat treatment is performed on the material. However, in the aluminum-stainless steel clad plate, the softening temperature of both metals is different, so that the softening heat treatment after joining to the clad is difficult. Moreover, since there is a difference in the deformation resistance of each metal, it is difficult to perform stable drawing processing.

[0010]

DISCLOSURE OF THE INVENTION An object of the present invention is to prevent a softening heat treatment from being performed after a clad plate obtained by joining dissimilar metal plates, particularly an aluminum-stainless clad plate, to prevent deformation resistance of each metal. A deep-drawing method capable of stably manufacturing a bottomed cylindrical container with a flange (the depth H is 0.8 times or more of the inner diameter D) even when different materials are drawn. .

[0011]

The present inventor has repeated numerous tests and studies on the formability of a dissimilar metal clad plate such as an aluminum-stainless clad plate, and by combining press forming and spinning. The present invention has been completed by finding that the depth of a bottomed cylindrical container with a flange can be increased.

The gist of the present invention resides in the following method for manufacturing a bottomed cylindrical container (see FIG. 1).

A method of manufacturing a bottomed cylindrical container with a flange from a dissimilar metal clad plate by deep drawing,
A method for manufacturing a bottomed cylindrical container with a flange, which is preformed by press forming and then subjected to spinning.

The drawing depth h in the above press forming process
Is larger than the punch shoulder radius R1 and 0.8 of the punch diameter d.
It is desirable that the range be less than or equal to twice. Further, it is desirable that the punch shoulder radius R1 in the press forming drawing is 5 times or more the plate thickness t, and the die shoulder radius R2 is 4 times or more the plate thickness t.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a situation in which a bottomed cylindrical container with a flange is manufactured from a clad plate by the method of the present invention. (A) is the situation before drawing and (b) is It is a figure which shows the state during drawing process, (c) shows the state during spinning process. Here, reference numeral 1 is a dissimilar metal clad plate obtained by stacking a non-ferrous metal material and a steel material, for example, aluminum-
Stainless clad plate, 1a is stainless steel (SUS 430J1
L, SUS 304L, etc., 1b is aluminum (A1000 series, A1
100 series), 5 is a spinning mandrel, and 6 is a spinning roller.

The method of manufacturing a bottomed cylindrical container with a flange of the present invention comprises the following two steps.

(1) As shown in FIG. 1 (a), it is placed in the die 3 with the aluminum side 1b of the material facing up. Then the same figure
As shown in (b), the punch 2 is pushed down from the upper center of the material to draw it.

(2) Next, as shown in FIG. 2C, the side wall portion formed by drawing is formed by spinning to a predetermined depth to obtain a bottomed cylindrical container.

At this time, the drawing depth h of the drawing process is
It is desirable that the radius be larger than the punch shoulder radius R1 and not larger than 0.8 times the punch diameter d. Further, by spinning the side wall portion and the flange portion, it is possible to make the thickness of the side wall uniform and mold to a predetermined depth to obtain a bottomed cylindrical container.

In the present invention, since the finish molding is performed by the spinning process, the surface of the molded product becomes smooth and the polishing for the finish becomes unnecessary. Further, in the case of manufacturing by the method only by press molding, the change in plate thickness differs depending on the site, and therefore there is a limit to the amount of decrease in plate thickness. On the other hand, in the spinning process, since the material is expanded like rolling, it can be formed thinner and deeper than press forming. That is, when forming at the same depth, it is possible to form with a small amount of material by combining press forming and spinning.

1. The reason why it is desirable to make the drawing depth h by press forming larger than the punch shoulder radius R1 and not more than 0.8 times the punch diameter d is: If the drawing depth h by press forming is less than the punch shoulder radius R1, the depth obtained by spinning is increased. The amount of protrusion increases, exceeding the molding limit of spinning processing,
It is difficult to make the depth H of the molded product 0.9 times or more the inner diameter D of the molded product. Also, if the drawing depth h by press molding exceeds 0.8 times the punch diameter d, cracks will easily occur in the molding material at the stage of press molding, and the material will be processed up to near the molding limit. Even if the spinning process is performed, it is difficult to make the forming depth H to be 0.9 times or more the inner diameter D of the formed product. Therefore, it is desirable that the drawing depth h in the press molding be in the range of (R1) to 0.8 × (d).

2. Punch shoulder radius R1 in press forming drawing
Is preferable to be 5 times or more of the plate thickness t: If the punch shoulder radius R1 is less than 5 times the plate thickness, in the clad plate bonded by the rolling method, the punch shoulder radius part at the time of press forming is This is because the reduction amount of the plate thickness becomes large and it may break.

3. Die shoulder radius R2 in press forming drawing
Is preferably four times the plate thickness t or more: The radius R2 of the die shoulder is a value that influences the shape of the flange of the molded product. However, if it is less than 4 times the plate thickness t, the plate thickness of the material becomes small due to tensile bending / bending back deformation at the shoulder portion of the die, and the material may break during spinning. The upper limit is not particularly limited, but it does not exceed 40 mm due to the shape of the molded product.

The size of the punch diameter d is not particularly limited, but a size commensurate with the inner diameter of the cylindrical container is selected.

The spinning process is preferably performed from the bottom corner radius part to the side wall part or from the bottom corner radius part to the side wall part and the flange part of the press-formed material.

The material to be used in the present invention is not limited to the aluminum-stainless steel clad plate, but any clad plate formed by combining different metals having different softening temperatures or deformation resistances can be used. The joining method may be any method such as an explosion-bonding method and a rolling method. Such clad plates include copper-stainless steel clad, aluminum-titanium clad, and the like.

[0027]

EXAMPLES Using the method shown in FIGS. 1 (invention example) and 3 (comparative example), two-layer and three-layer clad plates were used, and the inner diameter D was
A flanged bottomed cylindrical container was manufactured by pressing to a depth of 160 mm using a combination of press molding, spinning, and press molding and spinning.

The clad plate is made by joining stainless steel and aluminum by a rolling method, and each has a thickness of 2.0 mm.
The two-layer clad plate and the three-layer clad plate were used. When displaying stainless steel and aluminum according to Japanese Industrial Standards (JIS), the double-layer clad plate is "Al A1100 / SUS 43
0J1L ", three-layer clad plate is" SUS 430J1L / Al A1100 / SU "
S 304L ”combination. Test materials having a diameter of 320 mm and 380 mm were cut out from these materials and subjected to a draw forming test.

As a tool for press forming, the diameter d is 16
A punch having a diameter of 0 mm and a shoulder radius R1 of 15 mm was used. A die having an inner diameter of 164 mm and a shoulder radius R2 of 15 mm was used. Spinning tools include a 160 mm diameter mandrel and a 100 mm diameter mandrel.
A mm roller was used. The drawing process was performed in three ways: "press forming only", "spinning only" and "combination of press forming and spinning". In addition, the test material with a diameter of 380 mm was used for "press forming only", and the test material with a diameter of 320 mm was used for "spinning only" and "combination of press forming and spinning." used. Then, the "drawing depth h of the press forming" was changed, and the drawing process was performed until cracks occurred in the spinning process, and the H / D of the formed material was measured. The results are shown in Tables 1 and 2.

[0030]

[Table 1]

[0031]

[Table 2]

In the methods of Nos. 1 to 7 of the invention example, since the spinning process was performed after the draw forming by the press forming process in advance, the forming depth until cracking occurs in the spinning process is
140 ~ 200 mm, the depth of the final molded product is 0.88 ~
It could be molded 1.25 times.

On the other hand, in the method of No. 8 of the comparative example, cracks were generated when only the press forming work was carried out to draw 0.78 times (125 mm) the punch diameter d. In addition, No. 9 of the comparative example
In the method of, the inner diameter D of the molded product is 0.
Cracking occurred when molding 70 times (112 mm).

Table 2 shows the case where the three-layer clad plate was used, and almost the same result as that when the two-layer clad plate was used was obtained.

[0035]

According to the method of the present invention, a bottomed cylindrical container with a flange having an H / D close to 1 can be obtained even from a material such as a clad plate made of aluminum and stainless steel which is difficult to be softened by heat before forming. It can be manufactured.

[Brief description of drawings]

FIG. 1 is a diagram showing a situation in which a bottomed cylindrical container with a flange is manufactured from a clad plate by the method of the present invention, where (a) is a condition before drawing, and (b) is a condition during drawing. (c)
FIG. 8 is a diagram showing a situation during spinning processing.

FIG. 2 is a schematic vertical cross-sectional view of a bottomed cylindrical container with a flange formed from a plate material, where (a) is a bottomed cylindrical container with a flange made of a single plate (raw plate), and (b) is a two-layer clad. A bottomed cylindrical container with a flange made of a plate, and (c) is a bottomed cylindrical container with a flange made of a three-layer clad plate.

FIG. 3 is a vertical cross-sectional view showing the relationship between a blank and a tool during deep drawing by pressing a bottomed cylindrical container with a flange, where (a) is the state before drawing and (b) is the drawing. It is a figure which shows the state during molding processing.

[Explanation of symbols]

 1. Clad plate 2. Punch 3. Dice 4. Holding bracket 5. Mandrel 6. Roller M. Base plate V. Bottomed cylindrical container with flange

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B21D 51/26 B21D 51/26 X // A47J 27/00 101 A47J 27/00 101B

Claims (2)

[Claims] 1. A method for producing a bottomed cylindrical container with a flange from a dissimilar metal clad plate by deep drawing.
A method for manufacturing a bottomed cylindrical container with a flange, which comprises performing press forming in advance and then performing spinning. 2. The drawing depth in the press forming process is larger than the punch shoulder radius R1 and is 0.8 of the punch diameter d.
The method for manufacturing a bottomed cylindrical container with a flange according to claim 1, wherein the range is not more than double.