TW466273B - Method for cold-rolling annealing alloy cast sheet made from sheet casting rolling process - Google Patents

Abstract

The present invention provides a novel cold-rolling annealing method, which comprises: controlling the 1XXX series of aluminum alloy cast sheet made from a sheet casting rolling process; a subsequent cold-rolling step; a homogenizing step; another cold-rolling step; and an annealing heat-treatment step, to modify the recrystallization mechanism, thereby obtaining a uniform dense recrystallization grain texture, while weakening the intensity of the cubic orientation group structure ({001}100). The method achieves the objectives of improving the elongation and the protrusion rate of the cold-rolled annealed aluminum alloy sheet, thereby providing a method of producing an aluminum alloy sheet for capacitance enclosure having a good forming property from a dual-calender sheet casting rolling process.

Description

46 627 3 V. Description of the invention (l) Field of the invention: The present invention relates to a new method for cold-rolling annealing of granules, which is characterized by subjecting the alloy casting slabs produced by thin-rolling to cold-rolling and homogenization ^: Processes such as re-cold rolling and annealing treatments change the recrystallization mechanism of the alloy slab to obtain a uniformly refined recrystallized grain structure, and weaken the strength of the cube orientation aggregate structure ({001} < 100 >), Therefore, the effect of improving the elongation, lug rate and other properties of the aluminum cold-dry annealed aluminum alloy sheet is achieved. Description of the invention: The manufacturing process of general metal flakes includes traditional smelting, embryo washing, hot rolling, cold rolling, and final annealing and heat treatment processes. The process is extremely lengthy. The recently developed sheet casting and rolling process method is to pass the molten metal liquid through a rapidly cooled two-wheeled sheet casting and rolling mill to directly produce a sheet with a thickness similar to that of conventional prayer and hot rolling. The biggest feature of this new process is that the hot rolling intermediate process is omitted, so it has great benefits for simplifying the production process, grasping the time limit and reducing the production cost. It is because of this process that it is applied to the production of large industrial materials such as steel and aluminum. It has attracted a lot of attention and research interest. However, the slabs produced by the slab continuous casting process due to rapid cooling caused the solid solution of a large number of alloy elements and the continuation of the casting structure, which are completely different from the traditional casting and hot rolling structures. The recrystallization mechanism is also very different when it is processed. In the case of aluminum flakes, after the cold rolling annealing of this new process material, a coarse recrystallized grain structure that enters the surface layer region will be obtained, and at the same time, it has a very strong cube orientation aggregate structure strength. This kind of grain group iron characteristics will not only cause orange peel effect during aluminum sheet processing, but also deteriorate the surface of processed products.

4 6 62 7 3 V. Description of the invention (2) Quality. In general, in order to avoid such disadvantages during forming, said == must = grain size above 7 'means that the grain size is small y; 2: the strength of the group and the structure of the Γ position will also cause 0 ° and 9 °. ° Heavy dog ears. At the same time, the thickness of the surface layer =:;! "Causes the reduction of elongation, which is also unfavorable because of the use of 2 punching and forming. It is how to obtain a recrystallized grain structure with uniform sentence refinement, and Weaken the cubeness and reduce the earing rate by 1 to improve the inscription and ;; = ;: Her quality effect is for this-the new process urgently needs ~ 11 τ: From the present invention is the proper design of the cold rolling annealing process The recrystallization mechanism of the fire can be changed ... the sheet retreat and the cold-rolling retreat degree of the alloy are changed ... The "roll annealing treatment method" is mainly to reduce the thickness of i0-: The amount of cold rough rolling cut cold finish rolling; 'at 45 °. Homogenization treatment at a temperature above 2 hours for more than two hours, and then cold-rolled with a reduction of 70% or more to the final product thickness. Finally, the recrystallization annealing treatment at a temperature of 260 1 or higher can be obtained. The chain alloy sheet with good properties satisfactorily meets the requirements for forming the shape of the capacitor case. The eighth is shown below: a novel sheet: a cold-rolled annealing treatment method for an alloy casting sheet produced by a rolling process, the steps include:

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Page 5 4 6 62 7 3 Five 'invention description (3) (a) Provide an alloy casting slab produced by a thin-plate casting process; (b) Apply cold rough rolling, homogenization and cold to the alloy slab in order Finishing rolling treatment; and (c) applying an annealing heat treatment. The novel cold-rolled annealing method as described above, wherein the thickness of the alloy flakes provided in step (a) is less than about 10 mils; the reduction of the cold rough-rolled treatment in step (b) is 70% or more ; The homogeneous treatment in step (b) is performed at a temperature of 450 ° C ~ 600 ° C for more than two hours; the reduction of the cold finish rolling treatment in step (b) is 70% (inclusive) or more. In addition, the annealing temperature of the annealing process in step (c) is between 260 ° C and 330 ° C, and the annealing time is more than two hours. Another object of the present invention is to disclose a cold-rolled annealing treatment method for aluminum alloy slabs produced by the thin-film casting and rolling process, the steps comprising: (a) providing an aluminum alloy slab produced by the thin-film casting process; (b) The aluminum alloy slab is sequentially subjected to cold rough rolling, homogenization, and cold finishing rolling; and (c) an annealing heat treatment is performed. The cold-rolled annealing treatment method as described above, wherein the thickness of the aluminum alloy sheet provided in step (a) is about 10 mm or less; the reduction of the cold-rolled treatment in step (b) is 70% or more; The homogeneous treatment in step (b) is performed at a temperature of 4 50 ° C ~ 600 ° C for more than two hours; the reduction of the cold finish rolling treatment in step (b) is 70% or more. In addition, the annealing temperature of the annealing process in step (c) is between 260 ° C and 330 ° C, and the annealing time is more than two hours. In addition, the aluminum alloy sheet may be selected from the AA 1 XXX series

4 6 62 7 3 V. Description of the invention (4) Aluminum alloy flakes, such as AA1N30, AA1050 or AA1100. In order to make the advantages and features of the present invention more clearly visible, preferred embodiments according to the present invention and related drawings are described in detail below. Brief description of the drawings: Figure 1 shows the comparison of the grain structure of the cast slab after the traditional cold rolling annealing process and the processing process of the present invention. Fig. 2 shows the comparison of the lug phenomenon in the actual cup test after the slab is subjected to the conventional cold rolling annealing process and the process of the present invention. Example: ^ ° —ν The present invention is mainly a cold rolling annealing treatment method for alloy slabs produced by the thin film casting and rolling process, which first applies cold rough rolling treatment to aluminum produced by the thin film casting and rolling process = gold casting. . Then, homogenization is performed. 1 Next, cold finishing is applied. Finally, robbing *. 2 hours or more. In this way, the true name processing of the aluminum alloy casting can be changed, so as to obtain a uniformly refined recrystallized grain structure, and the strength of the weak eutectic structure, the bit aggregate structure ({001} < 100 >), 1 "dagger cube aluminum alloy sheet with elongation, lug rate and other properties. Improved cold rolling annealing 1 XXX series Shao alloy castings were processed by the invention of the invention |, its grain structure is shown in ^, Fire process and this: 'Aluminium treated according to the traditional cold rolling annealing process. As shown in Figure 1, the grain structure is greater than that of the process according to the present invention = shim, and its surface is coarser; The Lükou gold castings are more uniformly refined. In addition, the aluminum alloy castings are treated with traditional cold, and the grain structure is cold rolled and annealed, after J 杬: after the / cup test of the present invention, as 2 Page 7 46 627 3 V. Description of the invention (5) _ The figure shows that the traditional cold-rolled annealed Shaohe J is more processed than the cold-milk annealed according to the present invention ... Gold casting: two reasons ^ Limit Π details = weight loss ... qualitative treatment and annealing hot place (a) cold rough rolling Limitation of reduction and then = the thickness of the flake required for rolling with annealing and other procedures, the near-surface part of the slab produced due to the rapid cooling is largely combined == valley> and the center zone presents a distribution of coarse crystals. This slice = continued ... and recrystallized during annealing and heat treatment; the structure of this new process material will pass through: the coarse recrystallized grain structure in the surface layer area. Same as B [with near-body orientation aggregate structure strength ^ this g Η 方It will cause an orange peel effect, which will not only reduce the strength of the processed products in the direction of the processing of the inscriptions, but also cause the deterioration of the structure strength. ° At the same time, the reduction of the high elongation is not conducive to the formation, which is used for delaying. . Therefore, 'the present invention is required for the production of daggers-in the process of deep drawing and gold adding, more than 70% of I South grade moldability should be applied first), and then cooperated with subsequent necessary processing (/ rough cut (7⑽ ~ and f .... coarse dry cutting second fire ... recrystallized structure of the piece (grain structure and Li Shihe group is the second most retreat * 46 62 7 3 V. Description of the invention (6) dagger: test = = rate And lug rate) Table 1 cold rough rolling reduction (%) Tensile strength TS (Mpa) 30 78 50 80 60 7B 70 79 80 77 90 77 S: near surface layer; C: center portion

As shown in Table 1, the process according to the present invention can obtain an excellent combination of structure and properties. When the amount of cold rolling reduction is insufficient (< 70%), due to the effects of low strain-induced storage energy and differential distribution, the cold rolled aluminum sheet cannot be effectively refined by the heat treatment established by the present invention. The grain structure is recrystallized, and the annealed aluminum sheet has the strength of the cube-shaped aggregate structure. On the other hand, when the amount of cold rolling reduction is more than 70%, the effect of grain refinement and the weakening effect on the strength of the aggregate structure of the cube orientation can be fully exerted. Accordingly, a proper cold rolling reduction must be greater than 70%. ^ (2) Limitation of the homogenization temperature. The surface layer and the central part of the slab have a very different segregation phenomenon of the alloy element due to the direct casting process through rapid cooling, and the surface layer 枉The significant difference between the crystalline grains and the equiaxed grains in the central part makes the cast slabs obtain completely different recrystallized grain structures due to different materials after cold rolling. Therefore, after the cold rough dry annealing ', an appropriate homogenization treatment must be performed to improve the properties of the annealed aluminum sheet and the uniformity of the quality.

4 6 6 2 7 3 V. Description of the invention (7) In the homogenization process, the first consideration is temperature. If the selected temperature is too low, the segregation of alloy elements is difficult due to the solid solubility relationship and the relatively low diffusion rate. Effectively eliminated. When the selected temperature is too high, although the segregation of alloy elements can be effectively eliminated, the surface quality of the material is also deteriorated due to the problem of high temperature oxidation. In addition, an excessively high homogenization temperature will cause a large amount of precipitates to dissolve, resulting in an increase in the amount of solid-solution alloy in the cold-rolled aluminum flakes, which will cause a large amount of re-dissolution at the annealing and recrystallization temperature. The increase of the solid solution alloy content leads to a significant increase in the recrystallization temperature. On the other hand, after the homogenization treatment, it is not conducive to reducing the strength of the cubic azimuth aggregate structure after annealing, and thus cannot achieve the annealed recrystallized grain structure advertised by the present invention. Table 2 shows the relationship between the AA1N30 aluminum alloy casting slabs before different homogenization temperatures, the grain size of the aluminum slabs after cold rolling and annealing, the strength of the cube-oriented aggregate structure, and the recrystallization temperature. Table 2: Effect of homogenization temperature on the microstructure and properties of AA1N30 aluminum alloy slab after cold rolling and annealing. Homogeneity 彳 biS degree ΓΟ Tensile strength TS (Mpa) Elongation EL (%) Lug rate ER (%) Grain size (㈣ Orientation collection tissue strength 400 79 30 5.2 S: 70 / C: 30 60 450 77 32 3.5 20 ～ 30 28 500 78 37 3.0 10 ～ 30 23 550 77 39 2.6 10 ～ 15 18 600 80 45 2.0 10 ～ 15 15 620 70 32 6.0 35 ～ 50 42 S: near surface layer; C: central part According to the results shown in Table 2, the appropriate homogenization temperature should be limited to 4 50 ° C ~ 60 0 ° c. Another On the one hand, in order to make the inside and outside temperature of the entire aluminum coil uniform, its average temperature time is not less than 2 hours.

Page 10 46 627 3

V. Description of the invention (8) (3) Restriction on the reduction amount of cold finishing rolling The thickness of the binding piece after cold rolling and homogenization is 0.3 ~ 0.—thickness of sheet, and: J 'need to be cold refined and rolled to the desired position. Need to be improved by the ability of the dryer itself can be fired and then treated by Xiao Jing. However, due to the cold rolling deformation, the required sheet thickness, energy, etc. will vary with the difference in arrangement and preparation of cold rolling cuts, as well as storage and organization. On the other hand, the deformation set is changed, and the shape of 'is changed accordingly. In addition, properness will affect the design of the thickness of the annealed and recrystallized group of slabs. 1 The important reason is that the selection of the reduction is also related to the initial reduction of the cold finish rolling (50;! = Γί. Therefore, this experiment is not more than 9U / ° ), The effect on the elongation rate of the recrystallized group of the final annealed material and the structural strength of the azimuth set) and properties (tensile strength, elongation and lug rate). The effect of the change in the amount on the recrystallization structure of the annealed material is reduced | Crystal size | — (/ 〇) Ι \ ιΜη «^ (%) /. Ί% 1 _50 &quot; 60 * 1〇80 73 75 77 78 28 34 40 42 2 (&quot; m) S.60 / C.30 S: 45 / C: 25 15 to 25-bit aggregate organization strength 58 32 21 37 10 to 15 columns | 77 | 31 S: near surface layer; C: The central part is shown in Table 3, the influence of the cold rolling reduction on the recrystallization structure of the final annealed material. 'When the cold finishing rolling reduction is insufficient (<70%), the cold rolling is caused by the effects of strain and differential row distribution. After the heat treatment cycle established later, it is still unable to be thinned effectively. The annealed annealed aluminum sheet has a very strong right *. The storage energy induced from 4 15 to 30 25 reduces the recrystallized grain structure, while the annealed ingot has One side of the strong cube is 4 ，%, which is 7 η% in the cold cutting test. The nameplate has been researched by the present invention ... '1—, a J ^ • The strength of the scabbard blade collection organization. On the other hand, when the cold rolling reduction is 70% (g

Η 46 62 7 3 V. Description of the invention (9) 70%) ‘The effect of crystal grain refinement and the weakening of the strength of the structure of the cube azimuth aggregate are still brought into full play. Based on this, the proper cold finishing reduction must be greater than 70%. (4) Limitation of annealing heat treatment parameters The limitation of the recrystallization treatment temperature is to avoid too low a treatment temperature to obtain a completely recrystallized structure, resulting in poor processability. However, an excessively high processing temperature will cause abnormal grain growth and increase the strength of the cubic structure, which will degrade the original excellent structure and properties. Table 4 shows the recrystallized structure (grain structure and dimensional aggregate structure strength) and properties (tensile strength) of the final annealed material after different annealing temperatures (240 t: ~ 360 °). (Strength, elongation, and earing rate). Heat treatment M Green strength elongation EL Earing rate ER-Γ TS (Mpa) (%) (%) 240 115 8.6 5.2 * 260 102 36 3.2 '280 82 41 2.3 300 80 43 3.1 330 78 45 3.5 &quot; 360 70 9 * i? -S ', Umbrella 33 · 33 5.1 — Grain size iurti) Incomplete recrystallization 10 ～ 15 1 ^ 15- 15 15 ～ 20 20 ^ -40': 45 . Orientation lugs: mainly deformed aggregates, but the azimuth aggregates are not obvious. The strength of the azimuth aggregates is 15 17 19 25 32 As shown in the results of Table 4, 'The preferred recrystallization treatment temperature according to the present invention is between 260 t: between ~ 330 t. In addition, in order to obtain uniform structure and properties inside and outside the entire cold-rolled annealing t-roll, its average temperature time must not be less than 2 hours. (V) Applicable aluminum alloy castings Through the process of the present invention, aluminum obtained by two-wheel casting and rolling can be obtained.

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Page 12 46 62 7 3 Description of the 5th invention (ί) The alloy sheet is used to produce an aluminum alloy sheet for a high-moldability capacitor case having a high elongation, a low erect orientation structural strength, a lug rate, and a uniform fine-grained structure. After a series of complete discussions, it was found that the process of the present invention is not only suitable for the commonly used 1N30 aluminum species, but also for the 1 050 and 1 1 00 aluminum species of the same AAl XXX series through the process of the present invention. Rolled and annealed aluminum sheets can satisfactorily meet the properties of aluminum alloy sheets for high formability capacitor cases. Table 5 shows the properties of the alloy AA1N30, AA 1 0 50, and AA1100 aluminum alloy ingots that have been processed by the process of the present invention in a two-wheel thin film casting and rolling process, showing excellent performance. Properties of aluminum alloy slabs after being processed by the process of the present invention Aluminum alloy tensile strength TS (Mpa) Elongation rate EL (° / 〇) Lug rate ER (%) Grain size (um) Remark AA1050 73 45 2.8 10 ～ 20 Si; 0 * 25wt% max Fe: 0.40wt% max Al: 99.50wt% min AA1100 90 41 3.2 15 ～ 20 Si + Fe: 0.95wt% max Al: 99.00wt% min AA1N30 80 42 2.1 10 ～ 15 Si + Fe: 0.70wt% max Al: 99.3Owt% min Specification requirement 60 ～ 110 &gt; 35 &lt; 5 &lt; 32 Table 5: AA1N30, AA1050 and AA1100 with two-wheel thin-plate casting and rolling process According to the above, this The invention has not been disclosed or used in this technical field by the same or similar manufacturing method. Therefore, the invention has the patent elements such as novelty, advancement, and industrial value, and is filed in accordance with the provisions of the Patent Law. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Within the scope of patents. In addition, the scope of patent protection of the present invention

Page 13 46 62 7 3 V. Description of the invention (π) The one defined by the scope of interest shall prevail. Page 14

Claims (1)

4 6 627 3 @ 冷 Scroll annealing treatment VI. Application for patent scope 1. A method of alloy flakes produced by a thin film casting and rolling process, the steps of which include: (a) providing an alloy flake produced by a thin film casting process; (b) sequentially The alloy slab is subjected to cold rough rolling, homogenization, and cold refining; and (C) an annealing heat treatment. 2. The method according to item 1 of the scope of patent application, wherein the thickness of the alloy flakes provided in step (a) is about 10 mm or less. 3. The method as described in item 2 of the scope of patent application, wherein the reduction of the cold rough rolling treatment in step (b) is 70% or more. 4. The method according to item 3 of the scope of patent application, wherein the homogeneous treatment in step (b) is performed at a temperature between 450 ° C and 600 t, and the treatment time is more than two hours. 5. The method according to item 4 of the scope of the patent application, wherein the reduction amount of the cold finishing rolling in step (b) is 70% or more. 6. The method according to item 5 of the scope of patent application, wherein the annealing temperature of the annealing heat treatment of step (c) is between 26 0 t: ~ 330 t, and the annealing time is more than two hours. 7. —A cold rolling method for aluminum alloy slabs produced by a thin film casting and rolling process, the steps include: (a) providing an aluminum alloy slab produced by a thin film casting process; (b) sequentially ordering the aluminum The alloy slab is subjected to cold rough rolling, homogenization, and finish rolling; and 7 (c) an annealing heat treatment. Page 15 &quot; 46 627 3 6. Scope of patent application 8. The method described in item 7 of the scope of patent application, wherein the aluminum alloy sheet provided in step (a) has a thickness of about 10 mm or less. 9. The method according to item 8 of the scope of patent application, wherein the reduction amount of the cold rough rolling treatment of the aluminum alloy sheet in step (b) is 70% or more. 10. The method as described in item 9 of the scope of patent application, wherein in the homogeneous treatment of step (b), the treatment temperature is between 45 (TC ~ 600 ° C), and the treatment time is more than two hours. 11. The method as described in item 10 of the scope of patent application, wherein the reduction amount of the cold finishing rolling process in step (b) is 70% or more. 1 2. As described in item 11 of the scope of patent application Method, wherein the annealing temperature of the annealing heat treatment of step (c) is between 260 ° C and 330 ° C, and the annealing time is more than two hours. 1 3. As described in item 8 of the scope of patent application The method, wherein the aluminum alloy sheet is an AA1XXX aluminum alloy sheet. 1 4. The method according to item 13 of the scope of the patent application, wherein the aluminum alloy sheet is selected from the group consisting of AA1N30, AA 1050, or AA1100. Page 16