JPS59193253A - Preparation of deep drawing aluminum alloy plate - Google Patents

Abstract

PURPOSE:To obtain the titled aluminum alloy plate made suitable for the cap of a sake bottle, by a method wherein an Al-alloy cast ingot containing a specific amount of Cu, Fe and Si is uniformly heated, hot rolled and cold rolled to form an Al-alloy plate which is, in turn, held within a specific temp. range for a specific time while a heating speed and a cooling speed are specified and the heat treated plate is subjected to finish cold rolling under a specific rolling ratio. CONSTITUTION:An Al-alloy cast ingot has a composition consisting of, on a wt% basis, 0.02-0.1 Cu, 0.3-1 Fe, 0.2-0.6 Si and the remainder of Al. This Al-alloy cast ingot is uniformly heated, hot rolled and cold rolled while the formed plate is held at 380-500 deg.C within 10min or less in such a state that a heating speed and a cooling speed are set to 100 deg.C/min or more to complete recrystallization. In the next step, finish cold rolling is performed under a rolling ratio of 30% or more to obtain a deep drawing Al-alloy plate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an aluminum alloy plate for deep drawing, which is particularly suitable for making caps for whiskey and liquor bottles.

・Shiisky, Nishi) [PP camp of civilians (Pill 7)
The following characteristics are required for a cumulative moon such as an arbluf cap.

(1) Excellent inter-draw formability (few wrinkles) 6.Deep draw formability includes the drawing process and the drawing condition (wrinkles, etc.) after the process. It is necessary to adjust the mechanical properties, that is, the strength and elongation, and to form a structure in which the ears are slightly predominant in the rolling direction from a crystallographic point of view. On the other hand, the drawing status after processing (
Regarding wrinkles, rough skin, and occurrence of cracks during trimming, it is necessary to adjust the direction of the product material and the crystal grain shape.

(2) Low hearing rate. This is required from the viewpoint of improving yield and preventing missing circles.

(3) Excellent opening performance. This opening/closing, and 1
This represents the shearing properties of the perforated machine part 1 processed on the side wall of the cap.The strength of the side wall of the cap and the point of crack propagation require appropriate work hardening and crystallized material distribution. be done.

(4) The rigidity of the cap body is high. This is especially PS
(Press Screw) The second problem with caps is that they require strength (idling torque) to the extent that the inner part does not become loose, and appropriate work hardening is required.

The present invention provides a method for manufacturing an aluminum alloy plate for deep drawing, which can satisfy the above-mentioned required characteristics of caps for whiskey bottles, liquor bottles, etc.

The method for producing an aluminum alloy plate for deep drawing according to the present invention will be explained in detail.

First, the components and component ratios of the aluminum alloy used in the method for manufacturing an aluminum alloy plate for deep drawing according to the present invention will be explained.

Cu is an element that imparts strength and work hardening, and if the content is less than 0.02u+t%, it will not have this effect;
If the content exceeds 0 but%, the strength will be too high and the work hardening will be too large, causing problems with breakage during molding and unopenability. Therefore, the Cu content is 0.02-
0. But%.

Fe controls the directionality (synergistic effect with Si) and opens the cap (
It is effective in producing appropriate crystallized products, and the content is 0.
If the amount is less than t%, this effect is not present, and 1. If the content exceeds Ou+t%, giant crystallized substances will be generated, which will adversely affect moldability. Therefore, the Fe content is set to 0.3 to 1.0+++t%.

Si is effective in controlling directionality (synergistic effect with Fe) and homogenizing the structure (precipitation of Fe and Si), and the content is 0.
．． This effect is absent at less than 2u+t%, and 0.6u
If the content exceeds +L%, moldability will be adversely affected.

Therefore, the 81 content is 0.2~(1.6u+L%).

Note that a more desirable effect can be obtained if Fe/Si<2.

Furthermore, if the content of Ti, Zn, and Cr is less than O, ], ut% and at an appropriate content, they will not interfere with the effect of the method for producing an aluminum alloy plate for deep drawing according to the present invention. Furthermore, if the other elements normally contained in aluminum are at the level of impurities, they will not impede the effect.

Next, heat treatment in the method for producing an aluminum alloy plate for deep drawing according to the present invention will be explained.

After normal soaking, hot rolling, and cold rolling to the aluminum alloy II ingot with the above-mentioned components and ratios, the heating rate and cooling rate are set to 380 to 500° at a rate of 100°C/min or more.
The recrystallization is completed by holding the temperature at C, and then finishing cold working is carried out at a rolling reduction of 30% or more.
The reason why recrystallization is completed by holding the temperature at a temperature of The work hardening properties are improved, and the product sheet has excellent deep drawability, uncorking performance, and rigidity. Therefore, if the heating rate and cooling rate are less than 100°C/min, it will not be effective as it will give room for crystal grain growth and reprecipitation of solid solution contained elements, and if the temperature is less than 380°C, the recrystallized structure will not be effective. If the temperature exceeds 500°C, the crystal grains will grow, causing roughness of the drawing cup and a decrease in strength, making it difficult to use as a cap. Furthermore, if the holding time exceeds 10 minutes, it will cause mixed grains due to grain growth and waste energy.

The reason for performing cold working at a rolling reduction of 30% or more after the completion of this recrystallization is to obtain appropriate mechanical properties and a low edge ratio.
This effect cannot be achieved if the rolling ratio is less than 30%.

It is a good idea to carry out stabilization annealing as necessary, in order to simultaneously obtain appropriate mechanical properties and a low selvage rate after paint baking.

An embodiment of the method for producing an aluminum alloy plate for deep drawing according to the present invention will be described.

Example 1 An ingot produced by melting and casting an aluminum alloy having the components and proportions shown in Table 1 by a normal method was heated at 540°.
3.0 ma by hot rolling after soaking treatment of CX6Hr
n (end temperature was 300°C). At tll', 0.
It was cold rolled to 6 + + + + o - 0.8 mm, and various recrystallization treatments were performed to make it 0.25 mm. Note that stabilization annealing was performed to match the mechanical properties. The mechanical properties and cap properties at that time are shown in Table 2, and the degree of work hardening is shown in Table 3 in terms of cap side wall hardness.

As mentioned above, No. 1 (the method for manufacturing an aluminum alloy plate for deep drawing according to the present invention) is superior to those under other manufacturing conditions in terms of deep drawing formability and cap rigidity. Recognize. In addition, the grain size of No. 1 is 0.02
It was 2 mm.

Example 2 An ingot produced by melting and casting an aluminum alloy having the ingredients and proportions shown in Table 4 by a normal method was heated at 540°C
After soaking for 41-1r, hot rolling to 3.0+n
m (finishing temperature 300°C). Then 0.6-0
, 8111111, and the recrystallization was completed at a heating and cooling rate of 200 °C/min with a holding time of 3 minutes at a temperature of 43 (1'C).Then, the product thickness was 0.2
1) ffi mechanical properties were obtained by stabilizing annealing as 5 mm. Table 5 shows mechanical properties and cap properties.

It is clear from Table 5 that N001 manufactured by the method for producing an aluminum alloy for deep drawing according to the present invention is an aluminum alloy plate that is more suitable for deep drawing such as caps than others. .

Example 3 An ingot produced by manufacturing an aluminum alloy having the ingredients and proportions shown in Table 1 using a normal melting process was heated to 560'C.
X4) After 1r and soaking treatment, 3.0 m1 by hot rolling
o (finishing temperature 300°C). After that, rough annealing (3
50°C
111, perform recrystallization treatment under the conditions shown in Table 6, and
The final product was cold rolled to a thickness of 0.25 mm, and the mechanical properties were adjusted by stabilization annealing. 8 in Table 6! manipulative nature,
Indicates orientation, grain size and formability.

It is clear from Table 6 that the temperature reached (heating temperature after soaking, hot rolling, and cold rolling) is 380 to 500°C.
However, at temperatures below 380°C and above 500°C, recrystallization is insufficient or recrystallized grains grow, making it impossible to satisfy the properties as a cap. I know it can't be done.

As explained above, since the method for producing an aluminum alloy plate for deep drawing according to the present invention has the above-mentioned configuration, an aluminum alloy plate suitable for caps of whiskey and liquor bottles, etc. can be obtained. This has the excellent effect of reducing

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Claims (1)

[Claims] CuO, 02~0.1u+L%, Fe0.3~1.
After soaking, hot rolling, and cold rolling an aluminum alloy ingot containing Ou + t% and Si 0.2 to 0.61%, the heating rate and cooling rate were set to 100 ° C / min or less, and 380
~5 i') 1) Complete recrystallization by holding at a temperature of 0'C for less than 10 minutes, and then reduce the rolling rate to 30
A method for producing an aluminum alloy plate for deep drawing, characterized by performing the following steps: 1.% or more - cold working.