JPH0122346B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for producing an aluminum alloy with excellent directionality, and more particularly, to a method for producing an aluminum alloy with excellent directionality for deep drawing. [Prior Art] Semi-hard materials such as pure aluminum A3003 alloy and hard materials such as A3105 and A5052 alloys are used as materials for PP caps and the like manufactured by deep drawing. However, Al--Mg alloys have large variations in directionality, and after deep drawing, it is necessary to trim a large amount of the skirt, resulting in low yields. [Problems to be Solved by the Invention] In view of the above-mentioned problem of the variation in orientation of conventional aluminum alloys, the present inventor has conducted extensive research, and as a result, the present invention has been developed to suppress the variation in orientation to a low level. We have developed a method for producing aluminum alloys with excellent directionality that can eliminate or reduce the need for trimming after deep drawing, reduce the diameter of the punched blank, and improve the yield during forming. . [Means for solving the problem] The method for producing an aluminum alloy with excellent directionality according to the present invention includes: (1) 0.20 to 0.80 wt% Si, 0.30 to 1.75 wt% Fe,
An aluminum alloy containing 0.20 to 5 wt% Mg and the remainder Al and impurities is heated to a temperature of 400 to 600 °C during cold rolling at a heating rate of 100 °C/min or more, and immediately after heating or After holding for less than 100 minutes
Cooled at a cooling rate of ℃/min or more, and further reduced by 10%
The first invention is a method for producing an aluminum alloy with excellent orientation, characterized by performing the above cold rolling, (2) Si0.20-0.80wt%, Fe0.30-1.75wt%,
An aluminum alloy containing 0.20 to 5 wt% Mg, and one or both of Cu 0.05 to 0.5 wt% and Cr 0.03 to 0.5 wt%, with the balance Al and impurities is cold-rolled. During heating, heat to a temperature of 400 to 600°C at a heating rate of 100°C/min or more, and immediately after heating, or after holding for less than 10 minutes,
Cooled at a cooling rate of 100℃/min or more, and
The second method for producing an aluminum alloy with excellent orientation, which is characterized by cold rolling of 10% or more.
This invention consists of two inventions. The method for producing an aluminum alloy with excellent directionality according to the present invention will be described in detail below. First, the components and content ratios of the aluminum alloy used in the method for producing an aluminum alloy with excellent directionality according to the present invention will be explained. Si is an element that suppresses variations in deep-drawn selvedges and increases elongation, and the content is 0.20wt.
If the content is less than 0.80wt%, the effect of suppressing variation in the ear ratio will be poor, and if the content exceeds 0.80wt%, the crystal grains will become large and the processability will be poor. Therefore, the Si content is set to 0.20 to 0.80 wt%. Together with Si, Fe suppresses the variation in deep drawing edges,
It has the effect of refining crystal grains, and the content is 0.30wt.
If the content is less than 1.75wt%, this effect will be small, and if the content exceeds 1.75wt%, embrittlement will progress and elongation will not be obtained. Therefore, the Fe content is set to 0.30 to 1.75 wt%. Mg has the effect of increasing the strength of the material without affecting elongation and suppressing variations in the selvedge ratio. If the content is less than 0.20wt%, the desired effect cannot be obtained, and if the content exceeds 5wt%, If it is damaged, it becomes brittle and its workability deteriorates. Therefore, the Mg content is 0.20~5wt
%. By containing Cu at the same time as Mg, Mg
It also dissolves in solution and forms fine particles during baking.
By producing Al-Cu-Mg-based precipitates and hardening them, it does not adversely affect the variation in selvedge ratio, and by controlling the temperature of solution treatment, it is possible to manufacture aluminum alloys with various strengths. , the content is
Below 0.05wt%, the above effects cannot be expected;
When the content exceeds 0.5 wt%, the above effects are achieved, but the corrosion resistance as a material for deep drawing is greatly deteriorated. Therefore, the Cu content is set to 0.05 to 0.5 wt%. Cr is an element that increases the strength of aluminum alloys and improves the opening performance due to the effect of intermetallic compounds.The above effects cannot be expected if the content is less than 0.03wt%, and if the content exceeds 0.5wt%. If this happens, the deep drawability will deteriorate. Therefore, the Cr content is 0.03
~0.5wt%. Next, a method for producing an aluminum alloy with excellent directionality according to the present invention will be explained. To suppress variations in directionality, rapid heating,
Rapid cooling and intermediate annealing have great effects. In order to suppress this variation in directionality, it is very important to control precipitates due to various factors, and soaking temperature, time, hot rolling conditions, etc. also have a large influence, but rapid heating during intermediate annealing , short-term retention,
By performing rapid cooling, variations in directionality can be suppressed. In addition, since the crystal grains are fine, it has excellent deep drawability and roughness. Furthermore, the finish cold rolling rate is important for controlling the directionality, and the relationship between the finish cold rolling rate and the directionality is generally shown in FIG. 1. The cold working rate at which the directionality becomes 0% varies depending on the composition, hot finished plate thickness, hot rolling conditions, soaking conditions, etc., but may be determined so that the directionality becomes 0%. Furthermore, if intermediate annealing is performed immediately after hot rolling, the variation in directionality will be further reduced. For strength adjustment or residual stress removal after finish rolling
There is no change in directionality even if finish annealing is performed at a low temperature of 250°C or lower. [Example] An example of the method for producing an aluminum alloy with excellent directionality according to the present invention will be described. Example An aluminum alloy having the components and content ratios shown in Table 1 was formed into an ingot, and after facing and soaking treatment at 510°C for 6 hours, hot rolling was immediately started and the aluminum alloy was rolled at 310°C ±
Hot rolling was completed at 10°C to a thickness of 3 mm. After that, intermediate annealing was performed at a cold working rate that gave a directionality of 1% (batch intermediate annealing: 340°C x 2Hr,
Rapid heating and cooling: 450℃ x 0sec, temperature rise and fall speed 900
°C/min). Furthermore, cold rolling was performed to a final thickness of 0.25 mm. Thereafter, heat treatment was performed at 190°C for 10 minutes, which corresponds to paint baking treatment. Table 1 shows the results of measuring the mechanical properties and selvage ratio of the thin plate thus obtained. In Table 1, ・Direction is 33mmtφ punch diameter, 48% drawing ratio, n=
3.・For each directionality, 10 charges were melted and cast, manufactured using the same process, and the strength and selvedge ratio were measured.・Manufacturing process: Intermediate annealing: Achieved temperature: 450°C x 0 seconds, temperature increase/decrease speed: 900°C/min. : Intermediate annealing: 340℃ x 2 hours (40℃/hour,
temperature increase/decrease speed). : Process after heat treatment at 340℃ x 2 hours (40℃/hour, temperature increase/decrease speed) after hot rolling. : Process after heat treatment at 340℃ x 2 hours (40℃/hour, temperature increase/decrease speed) after hot rolling. It is.

[Table] Example 2 An aluminum alloy having the components and content ratios shown in Table 2 was formed into an ingot, and after facing and soaking treatment at 510°C for 4 hours, hot rolling was immediately started.
Finished to 3mmt at 10℃. Thereafter, intermediate annealing was performed at a cold working rate that gave a directionality of 1%. Furthermore, cold rolling was performed to a final thickness of 0.24 mm. After that, heat treatment was applied at 190°C for 10 minutes, which corresponds to paint baking treatment. Table 2 shows the results of measuring the mechanical properties and selvage ratio of the thin plates thus obtained. From this Table 2, it can be seen that the products obtained by the method of manufacturing aluminum alloys with excellent orientation according to the present invention have the effect of increasing strength without affecting the variation in orientation due to the inclusion of Cu, and also have the effect of increasing strength due to the inclusion of Cu. It can be seen that the inclusion is effective in increasing strength and improving openability.

〔Effect of the invention〕

As explained above, since the method for manufacturing an aluminum alloy with excellent directionality according to the present invention has the above configuration, an aluminum alloy with very little variation in selvage ratio can be manufactured, and after deep drawing, the hem The amount of trimming can be omitted or reduced. This has the effect of reducing the blank diameter during drawing and drawing, and greatly improving processing yield.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between finish rolling rate and directionality.

Claims (1)

[Claims] 1 Si0.20-0.80wt%, Fe0.30-1.75wt%,
An aluminum alloy containing 0.20 to 5 wt% Mg and the remainder Al and impurities is heated to a temperature of 400 to 600°C at a heating rate of 100°C/min or more during cold rolling, and immediately after heating, or A method for producing an aluminum alloy with excellent orientation, which comprises holding for 10 minutes or less, cooling at a cooling rate of 100°C/min or more, and then cold rolling by 10% or more. 2 Si0.20~0.80wt%, Fe0.30~1.75wt%,
An aluminum alloy containing 0.20 to 5 wt% Mg, and one or both of Cu 0.05 to 0.5 wt% and Cr 0.03 to 0.5 wt%, with the balance Al and impurities is cold-rolled. During heating, heat to a temperature of 400 to 600°C at a heating rate of 100°C/min or more, immediately after heating, or after holding for less than 10 minutes, cool at a cooling rate of 100°C/min or more, and further, 10% A method for producing an aluminum alloy with excellent orientation, characterized by performing the above cold rolling.