JPS6254183B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing an Al alloy plate that has high strength and high ductility, and particularly has a significantly small selvage ratio during deep drawing. In recent years, can containers for beer, carbonated drinks, etc. are made entirely of aluminum, consisting of a can body with a bottom and a can lid.
Peace cans are being used in large quantities. The body of this all-aluminum can has
A hard Al-Mn-Mg alloy material such as JISA3004 is used. The properties required for this material include high strength and low selvage during deep drawing, but these two properties are contradictory to each other, and in order to increase the strength, cold drawing is required. When the rolling rate is increased, the Al
There was a relationship in which the selvage ratio in the 45° direction in the hard alloy material increased. On the other hand, soft materials such as JISA3004 and AA3105 are also used for utensils and caps, but even in these soft materials, ear formation is observed in the 45° direction during deep drawing, making them different from so-called None Ear materials. Not yet. Therefore, the same applicant had previously filed the patent application No. 51-22215.
No. (Japanese Unexamined Patent Publication No. 52-105509), Mn: 0.3
Contains ~1.5%, Si: 0.1~0.5%, Mg: 0.3~3.0%, and further Fe: 0.3~0.8%, Cu:
0.01 to 0.3%, and one or more of Ti: 0.005 to 0.15%, with the remainder consisting of Al and unavoidable impurities (the above weight % and the below % all mean weight %). 500 to 600℃ at a heating rate of 100℃/min or more to cold-rolled Al alloy sheets with
By performing a rapid heating treatment consisting of rapid heating to a temperature within the temperature range of
We proposed a method (hereinafter referred to as the "prior invention method") that develops a cubic texture and minimizes the 45° radius during deep drawing while maintaining high strength. It is true that this prior invention method made it possible to obtain a material with a lower selvage rate during deep drawing compared to the material annealed in a conventional batch-type annealing furnace, but this improved material also This does not fully satisfy the requirement for a material for can bodies having a significantly lower selvage ratio. From the above-mentioned viewpoints, the inventors have conducted research focusing on the above-mentioned prior invention method in order to obtain an Al alloy plate that has high strength and has almost no ear formation during deep drawing. (a) Fine intermetallic compounds such as Al ₆ Mn are precipitated in the base material through homogenization treatment and hot rolling. (b) The above-mentioned intermetallic compounds are undesirable because they act to inhibit the development of cubic textures that develop 0-90° azimuth ears and lower the overall ear ratio during rapid heat treatment. (c) Therefore, if Mn is dissolved as a solid solution in the base material, it is possible to develop a cubic texture during rapid heating treatment, and an Al alloy sheet with almost no selvage during deep drawing can be obtained. What you get. The findings shown in (a) to (c) above have been obtained. Therefore, this invention was made based on the above knowledge, and Mn: 0.3 to 1.5%, Mg: 0.3 to 1.5%.
Contains 3.0%, and if necessary Fe: 0.1~
Al alloy containing one or more of the following: 0.8%, Si: 0.1-0.5%, Cu: 0.01-0.3%, and Ti: 0.005-0.15%, with the remainder consisting of Al and inevitable impurities. A hot-rolled sheet that is cast, homogenized, hot-rolled and formed under normal conditions is subjected to solution treatment at a temperature within the temperature range of 550 to 650°C for more than 1 hour. After applying cold rolling to a working degree of 40% or more to form a cold-rolled sheet, this cold-rolled sheet is heated at 500 to 600°C at a heating rate of 500°C/min or more. By rapidly heating to a temperature within the temperature range and immediately performing a rapid heat treatment of cooling to sufficiently develop a cubic texture, a soft material with almost no selvage can be obtained during deep drawing, and if necessary, the above-mentioned Processing degree for soft materials:
It is characterized in that it is made into a hard material having a predetermined high strength by cold rolling by 40 to 80%. Next, in the method for producing an Al alloy plate of the present invention, the reason why the component composition, solution treatment conditions, working degree, and rapid heat treatment conditions are limited as described above will be explained. A Component composition (a) The Mn component has a solid solution strengthening effect, but if its content is less than 0.3%, the desired effect cannot be obtained in this effect, while if it is contained in excess of 1.5%, processability decreases. Therefore, its content was set at 0.3 to 1.5%. (b) Mg The Mg component has the effect of strengthening the solid solution like Mn, but if its content is less than 0.3%, the desired effect cannot be obtained;
If the content exceeds 3.0%, it will not be possible to achieve the desired solid solution strengthening.
Its content was set at 0.3-3.0%. (c) Si The Si component has the effect of combining with Mg to form Mg ₂ Si and precipitation hardening the alloy, but if its content is less than 0.1%, the desired effect cannot be obtained, On the other hand, if the amount exceeds 0.5%, the processability will deteriorate.
Its content was set at 0.1 to 0.5%. (d) Cu The Cu component has a solid solution strengthening effect similar to Mn, but if the content is less than 0.01%, the desired effect cannot be obtained, while if the content exceeds 0.3%, the processability The content was set at 0.01% to 0.3%, as the amount of carbon dioxide deteriorates. (e) Fe The Fe component has the effect of refining crystal grains and preventing seizure of the die during deep drawing, but if its content is less than 0.1%, the desired effect cannot be obtained. ,on the other hand
If the content exceeds 0.8%, processability will deteriorate, so the content should be reduced from 0.1 to 0.8%.
It was set at 0.8%. (f) Ti The Ti component has the effect of refining crystal grains and improving workability, but its content is
If the content is less than 0.005%, the desired effect cannot be obtained, while if the content exceeds 0.15%,
Since it forms coarse compounds and impairs processability, the content should be reduced to 0.005 to 0.15.
%. B. Solution treatment conditions If the solution treatment temperature is less than 550℃ and the holding time is less than 1 hour, Mn cannot be completely dissolved in solid solution.On the other hand, solution treatment at a high temperature exceeding 650℃ Since high-temperature heating causes harmful effects and is undesirable, the solution treatment temperature is set at 550 to 650.
℃ and the holding time was set at 1 hour or more. C Working degree: Cold rolling of 40% or more Working degree in cold rolling after solution treatment is 40%
If the working degree is less than 40%, it will not be possible to obtain a satisfactory cubic texture in the rapid heat treatment in the subsequent process, and if the working degree is 40% or more, a cubic texture can be easily obtained. It is set at 40% or more. D. Rapid heating treatment conditions The faster the heating rate, the more it has a positive effect on the development of the cubic texture, and the positive effect is most noticeable when the heating rate is 500℃/
Since it is from min, the temperature increase rate should be set to 500℃/
It was set as min or more. Additionally, the higher the heating temperature, the easier and more reliable it is to obtain a cubic texture, but heating temperatures exceeding 600°C increase running costs.
In addition, the performance of the annealing furnace is unfavorable as it impairs productivity. On the other hand, it is not possible to obtain a satisfactory cubic texture at a heating temperature of less than 500°C, so the heating temperature was set at 500 to 600°C. . Note that this rapid heating treatment is preferably performed using a continuous annealing furnace. E Working degree: 40 to 80% cold rolling If the working degree is less than 40%, it is not possible to obtain a hard material with the desired strength, while if the working degree exceeds 80%, the 45° azimuth This not only increases the occurrence of cold rolling but also reduces elongation and deteriorates deep drawability. Therefore, the degree of cold rolling used to convert soft materials into hard materials should be reduced by 40 to 80%. It was determined that Next, the method of the present invention will be explained using examples. Example 1 Contains Mn: 1.04%, Mg: 1.69%, and the rest is Al.
Thickness: 457 with a composition consisting of and unavoidable impurities
An Al alloy DC ingot with a thickness of 6.0 mm was subjected to homogenization treatment at a temperature of 550°C for 12 hours, and then hot-rolled under normal conditions to form a hot-rolled plate with a thickness of 6.0 mm. Next, a part of the hot-rolled sheet was subjected to solution treatment by holding it at a temperature of 600°C for 2.4 hours and cooling with water, and the hot-rolled sheet subjected to such solution treatment and the hot-rolled sheet not subjected to this solution treatment were compared. Both were subjected to cold rolling with a working degree of 83% to form cold rolled sheets having a thickness of 1.0 mm. Next, approximately 1000
°C/min (using continuous annealing furnace) and approximately 1 °C/min
with heating rates of 350℃, 450℃, and
After heating to a temperature of 550℃, a rapid cooling process is immediately performed without holding the temperature.

[Table] Furthermore, a part of each was cold-rolled to a working degree of 60% to make a hard material with a thickness of 0.4 mm. Next, a cup was deep drawn from each of the resulting Al alloy plates under the conditions of a punch diameter of 33 mmφ and a drawing ratio of 1.67, and the selvage ratio in the 45° direction was measured. The measurement results are shown in Table 1. In Table 1, conditions outside the scope of the present invention are marked with *. As shown in Table 1, for both the soft material with a thickness of 1.0 mm and the hard material with a thickness of 0.4 mm, the faster the temperature increase rate in rapid heating treatment and the higher the heating temperature, the smaller the selvage ratio becomes. Moreover, this tendency is more pronounced when solution treatment is applied.
This is more noticeable than in the case where this is not applied, and it is clear that the material of the present invention produced under the conditions within the scope of the present invention exhibits only a very slight occurrence of selvage. Example 2 The composition of the Al alloy DC ingot was Mn: 0.59%,
Mg: 0.52%, Si: 0.16%, Al and unavoidable

【table】

[Table] Pure material: under the same conditions as in Example 1 above, except for the remainder, and a soft material with a thickness of 1.0 mm and the same 0.4
mm hard material and were manufactured respectively. For the soft material and hard material obtained as a result, the selvage ratio was measured under the same conditions as in Example 1. The measurement results are shown in Table 2, which also shows the manufacturing conditions. As shown in Table 2, Example 2 showed the same results as Example 1, and the material of the present invention showed only a very small selvage ratio. Example 3 The composition of the Al alloy DC ingot was Mn: 1.03%,
Mg: 1.09%, Fe: 0.49%, Si: 0.17%, Cu:
A soft material with a thickness of 1.0 mm and a hard material with a thickness of 0.4 mm were manufactured under the same conditions as in Example 1 above, except that 0.12%, Ti: 0.04%, Al and unavoidable impurities remained. Then, the ear percentage was measured under the same conditions as in Example 1. The measurement results are shown in Table 3 along with the manufacturing conditions.

【table】

[Table] shows the same results in Example 3 as in Examples 1 and 2, indicating that the occurrence of selvage in the material of the present invention is extremely small. As described above, according to the present invention, it is possible to produce soft materials and hard materials of Al alloy plates with extremely small selvage ratios during deep drawing, and the soft materials can be used to form objects such as utensils and caps. Further, the hard material is, for example, an all-aluminum 2
Industrially useful effects are brought about, such as suitability for deep drawing of bottomed can bodies of piece cans.

Claims (1)

[Claims] 1. An Al alloy containing 0.3 to 1.5% Mn, 0.3 to 3.0% Mg, and the remainder consisting of Al and unavoidable impurities (weight percent) is cast under normal conditions. After homogenizing and hot rolling to obtain a hot-rolled sheet, the hot-rolled sheet is subjected to solution treatment at a temperature within the temperature range of 550 to 650°C for 1 hour or more, and then processed : After cold-rolling 40% or more to make a cold-rolled sheet, it is heated to 500℃ or more at a heating rate of 500℃/min or more.
A method for producing an aluminum alloy plate for deep drawing with a low selvage rate, which is characterized by rapidly heating to a temperature within a temperature range of 600°C and immediately cooling to room temperature. 2 Contains Mn: 0.3 to 1.5%, Mg: 0.3 to 3.0%, further Fe: 0.1 to 0.8%, Si: 0.1 to 0.5%,
An Al alloy containing one or more of Cu: 0.01 to 0.3% and Ti: 0.005 to 0.15%, with the remainder consisting of Al and unavoidable impurities (weight %), was prepared under normal conditions. After casting, homogenizing, and hot rolling to obtain a hot-rolled sheet, the hot-rolled sheet is subjected to solution treatment of holding at a temperature within a temperature range of 550 to 650 ° C. for 1 hour or more, Then processing degree: 40%
After applying the above cold rolling to make a cold rolled sheet, 500
A method for producing an aluminum alloy plate for deep drawing with a low selvage rate, characterized by rapidly heating to a temperature within a temperature range of 500 to 600°C at a heating rate of ℃/min or more, and immediately cooling to room temperature. 3. An Al alloy containing Mn: 0.3 to 1.5%, Mg: 0.3 to 3.0%, and the remainder consisting of Al and unavoidable impurities (weight percent) is cast under normal conditions and homogenized. After hot rolling to obtain a hot-rolled sheet, the hot-rolled sheet is subjected to solution treatment at a temperature within the temperature range of 550 to 650°C for 1 hour or more, and then cooled to a working degree of 40% or more. After being subjected to inter-rolling to form a cold-rolled sheet, it is heated to
A deep material with a low selvage rate characterized by rapid heating to a temperature within the temperature range of 600℃, immediate cooling to room temperature, and subsequent cold rolling with a working degree of 40 to 80% to produce a hard material. Manufacturing method of aluminum alloy plate for drawing. 4 Contains Mn: 0.3 to 1.5%, Mg: 0.3 to 3.0%, further Fe: 0.1 to 0.8%, Si: 0.1 to 0.5%,
An Al alloy containing one or more of Cu: 0.01 to 0.3% and Ti: 0.005 to 0.15%, with the remainder consisting of Al and unavoidable impurities (weight %), was prepared under normal conditions. After casting, homogenizing, and hot rolling to obtain a hot-rolled sheet, the hot-rolled sheet is subjected to solution treatment of holding at a temperature within a temperature range of 550 to 650 ° C. for 1 hour or more, Then processing degree: 40%
After applying the above cold rolling to make a cold rolled sheet, 500
Rapidly heat to a temperature within the temperature range of 500 to 600°C at a heating rate of ℃/min or more, immediately cool to room temperature,
A method for producing an aluminum alloy plate for deep drawing with a low selvage ratio, which is characterized in that it is subsequently cold rolled to a working degree of 40 to 80% to form a hard material.