TW313591B - A manufacturing method for low earing ratio aluminum can body stocks - Google Patents

Abstract

A new process is invented for producing low earing ratio aluminum can body stocks. Al ingot containing by wt. ratio 0.8~1.4Mn, 0.2~0.6Fe, 0.1~0.3Si, 0.8~1.5Mg, 0.1~0.3Cu and not more than 0.2Ti is homogenized at a temperature range of 480 deg.C~560 deg.C for 1~15hrs, hot rolled within a temperature range of280 deg.C~480 deg.C, rough cold rolled with a reduction ratio between 65%~85%, a two stage intermediated annealing, finishing cold rolled with a reduction above 65%, and then finally stabilized at 150 deg.C~170 deg.C for 1~4 hrs. The two stage intermediated annealing, initial soaking at 250 deg.C~330 deg.C for 1~20hrs and following at 350 deg.C~420 deg.C for 1~6hrs, is a new practice to increase cube orientation intensity, and to result in superior microstructure for recrystallized grain. The aluminum can body stocks produced by the described invention process superior mechanical properties and particularly low earing ratio.

Description

Ministry of Economic Affairs, Central Escalation Bureau, Industrial and Consumer Cooperatives, Yince 313591 A7 B7-1 " ................ '.......... ---- 5. Description of the invention (I) The present invention relates to a method for manufacturing an aluminum alloy sheet with a low lug rate can body material; in particular, it refers to a low lug rate can body material with the advantages of both low lug rate and high strength Aluminum alloy sheet manufacturing method. According to the general beverage cans, if the internal single filling is a beverage containing gas, the aluminum can material used as a beverage can must have sufficient strength to withstand the internal pressure of the gas and the pressure resistance of the bottom of the can, such as soda and Beverages such as Coke are able to reduce the benzene gas, or use nitrogen filling in lotus beverages, juices and oolong teas, so the material strength of the can body must be able to withstand the internal pressure, so as not to cause the risk of explosion. · Aluminium-manganese-magnesium alloy is a non-heat-treated aluminum alloy, which is not as heat-treated as an aluminum alloy but must obtain a certain strength by rib rolling. It is generally used for the addition of manganese and magnesium and cold rolling. The hardening method makes it have high strength; at the same time, in view of the special properties such as good corrosion resistance and formability of aluminum-manganese-magnesium alloy, it is often used in the manufacture of deep-drawn thin-shaped beverage cans (DEEP) DRAWING AND IRONING CAN, referred to as DI tank). However, while increasing the strength of aluminum H, it will also cause a reduction in its formability, that is, during the forming process, a high lug rate will occur (EARING RA-Π〇, the definition of the lug rate is described in the later paragraph) Phenomenon, this phenomenon will cause two major problems for the can factory: first, after the can is completed, a high lug rate will occur and the gap between the peak and the trough will increase, and in order to make the height of the shear peak the same In the valley, so there is more waste to be cut, which leads to increased costs; Second, the aluminum cans in the canning process, especially during the shearing process, there are too many chips to be cut, which will cause the lack of stuck cans, thus reducing Yield. In view of the aforementioned paper size, the Chinese Gujia Standard (CNS) A4 specification (210X297mm) is used-ί · 〆 (please read the ίll · Issues on the back and fill in this page)

Α7 Β7 V. Printed by the Consumer Cooperative of the Central Harmony Bureau of the Ministry of Economic Affairs. Description of the invention (2) It can be seen that in terms of the characteristics of the material, the level of the lug rate is often the index of forming performance. For the aforementioned so-called lug rate, please refer to the schematic diagram of the lug rate in the first figure. It mainly refers to that after the canning process, the aluminum can body was originally rolled with a stick and the aluminum sheet was rolled to a square angle of 45 degrees. The material is relatively easy to elongate due to deformation, so it forms a four-valued peak; on the contrary, the material that originally used roller rolling delay and the aluminum H rolling direction to be Q degrees and 9Q degrees is not easy to deform, so it will form a four-valley valley, The height difference between the peak and the valley is a pseudo ratio. 01 is the lug rate. As shown in the reference formula listed below, it is the formula for calculating the lug rate. Generally, the lower the lug rate of the aluminum sheet, it means that it is formed. The better the performance. Lug rate = (HV) / (K5 * (H + V) * 100% Η: the average of the height of the peaks of the four peaks V: the average of the height of the peaks of the four peaks can be easily known from the physical properties of ordinary substances, The greater the cold rolling extension of the material, the higher the mechanical strength value. Although the higher the mechanical strength value, the better the strength requirements of the can body material. However, the relative value of the lug rate during rolling delay is also The higher it is, it is not easy to form, so the forming performance will be worse. Therefore, the high mechanical strength and low lug rate are often impossible for the can body material aluminum K. The inventor of this case has long been responsible for _ 于 中国 销The research and development department of the Iron Co., Ltd., in view of the high mechanical strength and low lug rate of the aforementioned conventional can body aluminum sheet, it is often unable to have many problems, inconvenience and lack of widespread existence, and finally developed a low The manufacturing method of aluminum alloy sheet with lug rate can body material, so that the manufactured aluminum has both high mechanical maple strength and low lug. The paper standard is applicable to China National Standard (CNS) Α4 specification (210Χ297mm) One (please read the ^ -Important ^ on the back first and then fill in Page) l · -k-— ^ 1 1 ^ ϋ · HI- m--1118--. R ml —fm 1H9 · Order ------ 「A7 —____ B7 V. Description of invention (>) Rate Advantages. That is, the main objective of the present invention is to provide a method for manufacturing aluminum alloy H with a low lug rate that has both the advantages of low lug rate and high mechanical strength. Based on the above objectives, the present invention is not excited The reason is that after the preparation step of adding specific alloy elements such as manganese, iron, sand, magnesium, copper and titanium into the aluminum material, it is cast into an aluminum embryo, which is then preheated at high temperature, hot rolling, cold rough rolling and two After the segment annealing heat treatment process, it can greatly increase the recrystallized grains of the internal cubic orientation of aluminum H (CUBE ΟίΠΕΗΤΑΤΙΝΝ), by which the excellent microstructure is conducive to the reduction of the lug rate, so the post-mine high rolling extension After the cold finish rolling and stabilization treatment, it can have the advantages of low lug rate and high strength. The reason is that the main process of the present invention is to sequentially go through the preparation step, the winding forming step, and the preheating part. Step, hot rolling step, cold rough rolling step, two-stage annealing heat treatment step, A method to complete the preparation by the finishing rolling step and the stabilization step, in which 0.8 ~ 1.4% by weight of manganese (wt%), 0.2 ~ 0.6% by weight of iron (wt%), 0.1 ~ 0.3% by weight of silicon (wt stone), 0.8 ~ 1.5% by weight of magnesium (wt%), 0.1 ~ 0.3% by weight of copper (wt%), 0.2% by weight of titanium (Wt%) and other ingredients are melted In aluminum material, then the aluminum material is cast into aluminum embryo. The aluminum embryo is applied to 480 ~ 5601 high temperature preheating, and the preheating time is 1 ~ 15 hours; and after hot rolling between 280 ~ 480C ; Then apply 65 ~ 85% cold rough rolling, and then perform two-stage annealing heat treatment; the first-stage annealing heat, the paper size is free to use the Chinese national rubbing rate (CNS) A4 specification (210X297 mm). (Please read ii · Issues on the back first, then fill out this page) ---------- Subscribe ------ ^ Central Ministry of Economic Affairs Bureau of Unification and Consumer Cooperatives Printed and printed by the Central Ministry of Economy Inspector ’s Office of Consumers ’Cooperatives, Inc. 313591 A7 _B7 I. Description of the invention (4) The treatment is heated from room temperature to 250 ~ 33Gt, and kept at this temperature for 1 ~ 20 hours After the time, the second stage of annealing heat treatment is carried out; the temperature of the second stage of annealing heat treatment is to heat the ore to 3 5 0 ~ 4 2 Q ° C, and to maintain it at this temperature for 1 to 6 hours; and then apply to more than 65% Cold finish rolling; finally, the stabilization step is carried out at 15G ~ 170 ° C for 1 ~ 4 hours, so that a low lug rate can body with the advantages of low lug rate and high machine maple strength can be prepared Aluminum alloy sheet. For the purpose mentioned above, one of the preferred embodiments of the present invention is cited and illustrated in the following figures, so as to enable a better understanding of the advantages, purposes, features and effects of the present invention. The following is a brief description of the Tong pattern: The schematic diagram of the pseudo-ear-ear rate shown in the first figure. The second figure shows a schematic flow chart of the manufacturing method of the present invention, H: peak, V: valley. Table 1: The chemical composition table of the test materials of the present invention. Table 2: The chemical composition table of aluminum materials in feasible embodiments of the present invention. Table 3: Table of homogenization, annealing and heat treatment, mechanical properties and lug rate of the feasible embodiments of the present invention. First of all, please refer to Table 1 for the chemical composition table of the pseudo-inventive experimental materials. It can be seen from the figure that the aluminum alloy used in the present invention is mainly added with Q. 8 ~ 1.4% by weight of manganese (: H t%), 0 3 2 ~ 0.6% by weight iron (wt%), 0.1 ~ 0.3% by weight sand (wt%) * 0.8 ~ 1.5% by weight magnesium (if t%), 0.1 ~ 0.3 % Copper by weight (wt%, Titanium (wt%) below 0.2% by weight) and other ingredients are fused on aluminum paper Baht standard is applicable to China National Standard (CNS) A4 specifications (210X297 mm (please read 1 * note on the back ^ 'Fill in this section I) f, ιτ The Ministry of Economic Affairs Central Bureau of Accreditation Beigong Consumer Cooperative Institution A7 B7 V. In the description of materials (ί), here is a summary of the important factors such as the proportion of each additive ingredient and its characteristics As follows, it can help to understand the benefits that various additives can achieve in the present invention. Manganese: The addition of manganese alloy can promote work hardening and increase strength, and because of the high alloy elements such as manganese and aluminum, iron and silicon Affinity, so whether in the pouring process or high temperature preheating step, manganese-containing precipitation can be found The presence of the precipitate can improve the strength. However, when excessive manganese is added in the casting process, it is easy to form huge precipitates. Such precipitates are often can-making plants because of their high hardness and poor bonding with aluminum. 4% 重量 ％ （Wt% The addition of excessive manganese element will also increase the protrusion rate and thus reduce the performance of the finished product, so the addition of manganese element is 0.8 ~ 1.4% by weight ) It is appropriate. Iron: Since the amount of iron solid dissolved in aluminum is not large, most of the iron atoms that play the role are combined with other atoms, and exist as precipitates such as α phase-aluminum iron manganese silicon, etc. It must be necessary, because part of the α-phase precipitates formed on the outer surface of the aluminum material can act as a medium contact wedge during the forming process of the punch cup, so that the aluminum κ does not directly contact the mold and slow down the aluminum can. During the forming process of the cup, the surface damage of the aluminum can body caused by the mutual friction between the aluminum Η and the die, but it is also the same as the manganese alloy, that is, the excessive addition of the iron alloy in the tethering process, it is also easy to form a huge Precipitate, become a flushing tank The origin of cracking, so the range of addition of ferroalloys is preferably Q.2 ~ 0.6% by weight (wt%). Silicon: When silicon is dissolved in an atomic state or precipitated in pure elements, its effect on aluminum alloys is not as good as that of compounds The precipitation is obvious, so a small amount of this paper scale is suitable for China National Standard (CNS) A4 specification (210X297mm) 1 &-(please read the note ^^ on the back and fill in this page)

31SS91 A7 B7 printed by the Staff Consumer Cooperative of the Central Bureau of Economic Development of the Ministry of Economic Affairs 5. Description of the invention (6) The addition of silicon alloys is necessary to facilitate the formation of α-phase precipitates, so as to slow down the aluminum cans during the cup forming process. The surface damage of the aluminum can body caused by the mutual die rubbing between the dies, but it can be easily inferred from the mechanical characteristics of silicon. The addition of excessive silicon can easily lead to recrystallized crystals after annealing and heat treatment in an inappropriate process. The grains are coarsened, so the addition range of the silicon alloy is preferably from Q.1 to 0.3% by weight (: wt%). Magnesium: the addition of magnesium alloys can refine the recrystallized grains after annealing and heat treatment, and magnesium is also the best alloy to promote work hardening among non-heat-treated aluminum alloys, that is, its work hardening index is higher, based on mechanical strength. Considering that the more magnesium alloy is added, the more mechanical strength can be improved, but because magnesium. Alloy is very easy to promote work hardening, the excessive addition of magnesium alloy will easily cause the can body to break during the aluminum can forming process, so the magnesium alloy The range of addition is preferably 0.8 to 1.5% by weight (wt%). Copper: The addition of copper alloys also has the effect of processing strengthening, so the addition of 0.1 to 0.3% by weight of copper alloys contributes to the improvement of mechanical strength. Titanium: Titanium alloy is mainly used as a fine-graining agent added during casting. It is used to refine the aluminum microstructure and reduce grain coarsening. However, excessive addition of titanium alloy will also form a huge amount during the casting process. The precipitates are not conducive to the forming performance of aluminum sheet, so the addition of titanium alloy should be 0.2% by weight or less (wt%). For the mine, please refer to the second figure, which is a schematic diagram of the process flow of the present invention. It can be seen from the figure that the process flow of the process of the present invention pseudo first performs the preparation step, that is, the aforementioned manganese, iron, silicon, magnesium, copper, Titanium and other components are subject to the Chinese National Standard (CNS) A4 specification (210X297 mm) according to the paper standard (please read the precautions on the back before filling this page). Order A7 _B7_ Printed by the Employees ’Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. Description of the invention (7) The limited weight percentage range is dissolved in the aluminum material, and then cast and formed in the step of using the semi-continuous ore manufacturing method (SEMI-CONTINUOUS CASTING) to cast into an aluminum embryo, and then the aluminum embryo is given Perform high temperature preheating step, this preheating is performed in the range of 4δ0 ~ 56G10, and the preheating time is 1 ~ 15 hours, this high temperature preheating step with the purpose of homogenization, in addition to making the alloy composition can be evenly distributed In addition to the inside of the aluminum material, another purpose is to generate an appropriate size of α-phase precipitates inside the aluminum material. The lid can make it tend to tend to reduce the alloy's free energy due to the α-phase precipitates. The size and size of the particles depend on temperature factors, for example, c (phase precipitates are large and small at 400¾ and not conducive to growth, but cx phase precipitates at 5〇 () t). The particles are small, large, moderate, and conducive to growth. As for the α-phase precipitates, which are most likely to be precipitated in the range of 400 ~ 50 0 ° C, it is possible to make the number and size of the particles moderate by controlling their temperature around 500t. It is the most advantageous; when the high temperature preheating step is completed, the hot rolling step is performed in the range of 280 ~ 4801C to introduce the appropriate strain energy. When the hot rolling step ends, the cold rough rolling step is carried out immediately, In this step, the appropriate strain energy is also introduced, which must involve the appropriate cold rough rolling reduction, and the rolling reduction of this step is about 65 ~ 85% of cold rough rolling reduction; and then two Step annealing heat treatment step, this step is also very important. It can be seen from the general knowledge of alloys that in the microstructure of aluminum sheet, the more cubic orientation (CUBE ORIENTATION) grains, the more it contributes to the reduction of the lug rate. Especially if the cubic orientation grain can make it When the amount is deformed at the material direction of 0 degrees and 90 degrees (trough.), Instead of the material direction at 45 degrees (crest), the difference between the peak and the trough will be balanced. Use the Chinese National Standard (CNS) A4 specification (210X297mm) (Please read the note ^^ on the back before filling this page)

Printed by the Central Bureau of Economics, Ministry of Economic Affairs, Beigong Consumer Cooperatives A7 B7 V. Description of Invention (g) As much as possible to extend its weight along 0 degrees and 90 degrees and can take advantage of this excellent organization of organization to help the ears The rate is reduced, so in this step, the present invention uses a two-stage annealing heat treatment which is very different from the traditional one-stage annealing heat treatment, whereby a hot place burial method is used to generate more cubic orientation grains; The driving force for crystallization comes from the strain energy in the rolling process (STRAIN ENERGY), and the hot rolling step and the cold rough rolling step in the manufacturing method of the present invention can lead to appropriate strain energy. .

The first annealing heat treatment step in the two-stage annealing heat treatment step, pseudo heating from room temperature to 25 0 ~ 3 3 Q ° C, and maintained at this temperature for 1 ~ 20 hours, the main purpose is to crystal The high-density differential structure at the edge of the object is recovered and heat-treated, so that the strain energy inside the aluminum material is evenly distributed, so in addition to the formation of recrystallized nuclei around the crystal, it can also nucleate at the grain boundary (NUCLEATI0N) , Gain, crystallized objects are something that must be produced during the casting process, and when recrystallized crystal nuclei such as Yan are formed around the crystallized objects, it is easy to extend along the 45-degree direction during rolling delay to produce a high lug rate. If the recrystallized crystal nucleus is formed at the grain boundary, the rolling delay component will easily extend along 0 degrees and 90 degrees to produce a low lug rate, and because of the low temperature heat treatment, if the material is to be completely The crystalline structure is quite time-consuming, and the high temperature heat treatment is more conducive to the growth of the cubic nucleus (GROWTH). To reduce the lug rate, continue to heat to 350 ~ 42G ° C, and maintain 1 ~ S at this temperature The second annealing treatment in the hour. Immediately after the two-stage annealing heat treatment step, a cold finish rolling step is carried out. Based on the mechanical strength requirements of the aluminum K finished product, more than 65% cold finish rolling must be applied. When the cold finish rolling step is completed, to avoid The size of the aluminum sheet in the paper is applicable to the Chinese national standard (CNS) A4 specification (210 father 297 mm) one [| one (read the precautions on the back of the poem before filling this page)

A7 B7 of the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (^) During the canning process of the can factory, the processing softening phenomenon will occur due to over-processing and forming, so a stabilization process must be carried out. This stabilization step Pseudo 150 ~ 1 70¾, hold for 1 ~ 4 hours, so you can prepare a low lug rate aluminum alloy sheet with the advantages of low lug rate and high mechanical strength. In order to further prove the present invention is low The superiority of the manufacturing method for the aluminum alloy H of the can body material is as follows. The comparison and description of the following embodiments are as follows: Please refer to Table 2 below, which is similar to the aluminum alloy chemical composition table of feasible embodiments of the present invention and traditional materials The chemical composition of the aluminum material used in test pieces 1 to 6 of this embodiment has 1.15% by weight of manganese (Ut%), 0.38% by weight of iron (wt%), 0.20% by weight of bb silicon (wt%) ), 1.21% by weight | (wt%), Q.20% by weight of copper Ut%) 0.G1 Titanium (wt%) below 1% by weight, and the remaining aluminum and other ingredients are melted and cast into Aluminum embryo, and then put the aluminum embryo of the front test piece 1 ~ S as shown in the second picture According to different process conditions of the test Η number of different withdrawal 1~δ Concept tissue test results. Please refer to Table 3 for the mine, which is the homogenization, annealing and heat treatment, mechanical properties and lug rate side test table of feasible embodiments of the present invention. The test No. 1 ~ 3 is mainly to compare the shadow of high temperature preheating temperature. 47 (TC pre-baking is due to the low temperature, so the α phase distribution is quite fine and dense, so during the annealing process, the .ct phase will inhibit the growth of the recrystallized crystal nuclei on the cubic orientation on the grain boundary, resulting in the finished ear Although the preheating temperature of S7G ° C is higher, the temperature of b7 (the phase shows a sparse distribution, but the alloy # dissolved in the aluminum material is relatively high, plus the aluminum material after cold rough rolling is High strain energy state, so during the heat treatment annealing process, fine compounds will be precipitated at the edge of the differential row, that is (please read the notes on the back and fill in this page). F

1T This paper scale is applicable to China National Standard (CNS) A4 (210X297mm), 丨 X, 313591 A7 B7 V. Description of invention (| D) Restricted shifting of shifts, thus restricting the outward movement of recrystallized nuclei Will also cause the lug rate to rise C, still refer to Table 3, test Η 2, 4, 5 mainly shows the effect of two-stage annealing, it can be seen that the first annealing heat treatment temperature is too high or Too low, the lug rate value is not ideal. Test No. 4 is mainly because the heat energy supplied by the outside during annealing and heat treatment at a low temperature of 240 ° C cannot allow the difference row to have enough energy to overcome α relative to its The binding force makes the cubic recrystallized crystal nucleus not easy to nucleate on the grain boundary; in addition, if the annealing heat treatment is carried out at 34 high temperature, the difference is obtained by the outside world with a relatively high energy, making it very easy to get rid of the α phase. On the contrary, the direct recrystallization ® has no recovery effect, so the recrystallized crystal nucleus in the cubic orientation is not easy to nucleate on the grain boundary, resulting in a higher value of the lug rate of No. 4 and No. 5 test H; No. 7 test H is a traditional segment Of high-earing rate of heat treatment No. 5 due to the same test piece, as 2, and 6 test Η in comparison of the effect of temperature stabilization, indicated by Table III, the stabilization temperature has not bad lugs rate between 150~17G ° C. In summary, according to the present invention, by proper blending of the alloy, the aluminum alloy is cast and then preheated by homogenization and high temperature, hot rolling, cold rough rolling and two-stage annealing heat treatment process. Significantly increase the recrystallized grains of the internal cubic orientation (CUBE ORIEHTATIQH) of aluminum Η, by which the excellent thorough view group is conducive to the reduction of the lug rate, so after the subsequent cold finish rolling and stabilization treatment of high rolling reduction , You can have the advantages of low lug rate and high strength. In the traditional manufacturing process, the higher the material strength, the higher the lug rate, and in order to reduce the lug rate, you have to sacrifice high strength. The invention successfully developed a can body with a low lug rate without reducing the strength. '' This paper scale is applicable to the Chinese National Standard (匚 呢) 84 specifications (210 father 297 mm) 1 丨 1 (please read the notes on the back and then fill out this page), 11 the Ministry of Economic Affairs Central Bureau of Accreditation and unemployed consumption Cooperative printing and printing The Central Standards Bureau of the Ministry of Economic Affairs-Industry and Consumer Cooperative Ink A7 B7 V. Description of the invention (1 h According to the foregoing, the present invention has not had any similar or similar manufacturing methods exposed or used in this technical field, which is in line with The patent requirements for inventions such as novelty, industrial value, progress, etc., shall be filed in accordance with the provisions of the Patent Law. However, the above mentioned only false one of the preferred and feasible embodiments of the present invention, so the description of the application of the present invention is cited The equivalent structure of the book and the scope of the patent application should be included in the scope of the patent of the present invention. The size of this paper is suitable for the National Network of China ^ (CNS) A4 specification (2 similar to 297 public | ^) (Please read the note $ item on the back before filling in this congratulations)

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Claims (1)

A8 B8 No. 33 10 6 6 95 Application for the invention patent application amendments to the scope of the patent 1. A method for manufacturing aluminum alloy II with a low lug rate tank body, the special feature is that the aluminum material is added with 0. 8 ~ 1.4% Weight percent manganese (wt%), 0.2 ~ 0.6% weight percent iron (wt%), 0.1 ~ 0.3% weight percent silicon (wt%), 0.8 ~ 1.5% weight percent IM (wt%), 0.1 ~ After 0.3% by weight of copper (wt%), and 0.2% by weight of titanium (wt%) and other specific alloy elements are prepared, after the casting step, an aluminum embryo is formed, and then the aluminum embryo is preheated 480 ~ 5601C, and the preheating time of 1 ~ 15 hours; and after performing the hot rolling step between 280 ~ 48013; then apply 65 ~ 85% cold rough rolling step, then two-stage type Annealing heat treatment step; the first annealing heat treatment step is heated from room temperature to 25 0 ~ 330¾, and after the temperature is maintained for 1 ~ 20 hours, the second annealing heat treatment step is performed; the temperature of the second annealing heat treatment step is continued Heat to 35Q ~ 42Q ° C, and keep at this temperature for 1 ~ 6 hours; then apply 65% or more cold finish rolling step; finally, the stabilization step, at 150 ~ 17010, hold for 1 ~ 4 hours JL ----------- | installed--.-'(Please read the back first Please pay attention to this page and then fill out this page.) The paper printed by the Employee Consumer Cooperative of the Central Bureau of Economic Affairs of the Ministry of Economic Affairs applies the Chinese National Standard (CNS) A4 specification (210X297mm) _