CN110607493A - Preparation process of magnesium alloy foil strip - Google Patents
Preparation process of magnesium alloy foil strip Download PDFInfo
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- CN110607493A CN110607493A CN201911041540.3A CN201911041540A CN110607493A CN 110607493 A CN110607493 A CN 110607493A CN 201911041540 A CN201911041540 A CN 201911041540A CN 110607493 A CN110607493 A CN 110607493A
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- rolling
- magnesium alloy
- foil strip
- alloy foil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The invention discloses a preparation process of a magnesium alloy foil strip, which comprises the steps of carrying out surface milling treatment and preheating on a magnesium alloy raw material; hot rolling and annealing for multiple times; the warm rolling and annealing treatment processes are circulated for a plurality of times; and the annealing treatment and the multiple cold rolling process are circulated for a plurality of times to obtain the magnesium alloy foil strip. The preparation process provided by the invention realizes roll rolling, and the thickness of the magnesium alloy foil strip obtained by the preparation process reaches 0.06-0.1 mm.
Description
Technical Field
The invention relates to the technical field of magnesium alloy calendaring forming, in particular to a preparation process of a magnesium alloy foil strip.
Background
The magnesium alloy has the characteristics of low density, good damping and shock absorption, good machining performance, heat conduction and heat dissipation performance and the like, and is widely applied to the fields of rail transit, national defense industry, aerospace and the like. The AZ31 magnesium alloy has the advantages of good casting performance, excellent plastic processing performance, better mechanical property, low cost and the like, and is one of the most widely applied alloys in the magnesium alloy.
The AZ31 magnesium alloy sheet is widely applied to the fields of 3C products, high-end sound equipment and the like, and is mainly used for manufacturing parts such as product shells, patch support plates, sound vibration membranes and the like. However, the traditional process mainly adopts sheet rolling as a main process, and can not roll in coils, so that the production efficiency is low, the product quality is unstable, particularly, the production technology difficulty of ultrathin strips with the thickness of less than 0.2mm is large, domestic production is almost not realized, and most of the ultrathin strips depend on import.
Disclosure of Invention
The invention provides a preparation process of a magnesium alloy foil strip, which is used for overcoming the defects that the rolling cannot be carried out in the prior art, the production technology difficulty of ultrathin strips with the thickness of less than 0.2mm is high and the like, the roll rolling is realized, and the thickness of the magnesium alloy foil strip obtained by adopting the preparation process disclosed by the invention reaches 0.06-0.1 mm.
In order to achieve the purpose, the invention provides a preparation process of a magnesium alloy foil strip, which comprises the following steps:
s1: carrying out surface milling treatment on the magnesium alloy raw material, and preheating;
s2: carrying out at least one hot rolling on the magnesium alloy raw material subjected to S1 at 400-480 ℃, and then carrying out annealing treatment at 400-480 ℃ for 1-3 h to obtain a magnesium plate;
s3: carrying out multi-fire warm rolling on the magnesium plate obtained in the step S2 to obtain a plate; each heating and rolling step comprises at least one heating and rolling step and one annealing treatment step, wherein the temperature of a roller for heating and rolling is controlled to be 100-280 ℃;
s4: coiling the plate obtained in the step S3 into coiled material, carrying out annealing treatment on the coiled material at 380-450 ℃ for 1-3 h, and then carrying out multi-fire rolling at room temperature to obtain a magnesium alloy foil strip; each rolling comprises at least one cold rolling and one annealing treatment;
rolling tension of each pass of cold rollingF is equal to σ0.20.1 to 0.5 times of S, σ0.2Is the yield strength of the magnesium alloy, and S is the sectional area of the coil.
Compared with the prior art, the invention has the beneficial effects that:
the preparation process of the magnesium alloy foil strip provided by the invention comprises the steps of firstly carrying out surface milling treatment on the raw material, preheating, removing casting defects on the surface of the raw material, preheating the raw material to homogenize the structure, improving the casting structure and facilitating the subsequent hot rolling; then, the raw materials are subjected to hot rolling and annealing treatment, the hot rolling can ensure larger reduction, the rolling efficiency is improved, and the casting structure is improved to facilitate subsequent rolling; the deformation stress of the material is eliminated by annealing treatment, so that the deformed structure is recovered and recrystallized, and the deformation capability of the material is improved; then carrying out multi-fire warm rolling on the magnesium plate, further reducing the thickness of the plate-shaped magnesium material by the warm rolling to obtain a thinner plate, and simultaneously carrying out annealing treatment to improve the deformability of the plate and ensure that the subsequent rolling can be smoothly carried out; finally, the sheet is coiled into a coiled material, the coiled material is subjected to multi-fire cold rolling, the production efficiency can be improved and the stability of the product quality can be kept by rolling the sheet, and the thickness of the obtained magnesium alloy foil strip can reach 0.06-0.1 mm by cold rolling; meanwhile, the rolling tension F of cold rolling is controlled, so that the rolling is ensured to be smoothly carried out, and the high-quality magnesium alloy thin strip is obtained (the edge wave of the strip is serious due to the over-small rolling tension F, and the product quality is unqualified due to the tearing of the middle of the strip caused by uneven strip surface; in addition, the preparation process of the invention adopts the combination of hot rolling, warm rolling and cold rolling, thereby saving energy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a process for preparing a magnesium alloy foil strip provided by the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a preparation process of a magnesium alloy foil strip, which comprises the following steps as shown in figure 1:
s1: carrying out surface milling treatment on the magnesium alloy raw material, and preheating;
preferably, the preheating temperature is 400-480 ℃, and the time is 8-20 h. The preheating is performed for the convenience of subsequent hot rolling, and the preheating temperature and time are controlled for homogenizing the casting blank, so that the possibility of cracking in the rolling process is reduced, and the yield of the material is improved.
S2: carrying out at least one hot rolling on the magnesium alloy raw material subjected to S1 at 400-480 ℃, and then carrying out annealing treatment at 400-480 ℃ for 1-3 h to obtain a magnesium plate;
preferably, heat preservation is carried out for 0.2-1.5 h at 400-480 ℃ after each pass of hot rolling, and the reduction of each pass of hot rolling is 10-40%;
the hot rolling speed is 8-15 m/min, so that the product quality and the rolling efficiency are ensured simultaneously.
The hot rolling is used for cogging the raw materials, rolling the raw materials into a platy magnesium material, and performing multi-pass hot rolling to ensure successful cogging and control the thickness of the platy magnesium material; after each hot rolling, carrying out heat preservation treatment for a period of time, wherein firstly, the material is kept at a high temperature to ensure the deformability, and secondly, the deformed tissue is subjected to recovery recrystallization to ensure a large reduction; the reduction per pass is too small, the rolling efficiency is too low, and the reduction per pass is too large, so that the internal structure of the magnesium alloy can be damaged, and cracks and even fractures can occur.
Preferably, the total reduction of the multi-pass hot rolling is 60-98%. The raw material is rolled into a platy magnesium material with a certain thickness by hot rolling, so that the difficulty of subsequent warm rolling is reduced; and then the thickness is further reduced by warm rolling to save energy.
S3: carrying out multi-fire warm rolling on the magnesium plate obtained in the step S2 to obtain a plate; each heating and rolling step comprises at least one heating and rolling step and one annealing treatment step, wherein the temperature of a roller for heating and rolling is controlled to be 100-280 ℃;
preferably, the total reduction of warm rolling per fire is 30-60%; each hot rolling step comprises heat preservation for 1-3 hours at 380-450 ℃ for annealing treatment. The total reduction of each hot rolling is controlled to ensure the product quality and the preparation efficiency, and the hot rolling is carried out for a plurality of times to reduce the thickness of the product as much as possible. And annealing treatment is carried out after each warm rolling, so that firstly, the material is kept at high temperature to ensure the deformability, and secondly, the deformed tissue is subjected to recovery recrystallization to ensure large reduction.
Preferably, the rolling reduction of each pass of warm rolling is 5-20%;
the rolling speed of warm rolling is 5-10 m/min.
The warm rolling is used for further reducing the thickness of the plate-shaped magnesium material, and the multi-pass warm rolling is carried out to reduce the thickness of the plate-shaped magnesium material as much as possible; after each pass of warm rolling, carrying out heat preservation treatment for a period of time to ensure that crystal grains in the magnesium alloy become uniform, thereby ensuring that the mechanical property of the plate-shaped magnesium material is excellent; the rolling efficiency is improved on the premise of ensuring the mechanical property of a final product by controlling the reduction of each pass, the reduction of each pass is too small, the rolling efficiency is too low, and the reduction of each pass is too large, so that the internal structure of the magnesium alloy can be damaged, and cracks and even fractures can appear.
S4: coiling the plate obtained in the step S3 into coiled material, carrying out annealing treatment on the coiled material at 380-450 ℃ for 1-3 h, and then carrying out multi-fire rolling at room temperature to obtain a magnesium alloy foil strip; each rolling comprises at least one cold rolling and one annealing treatment;
the rolling tension F of each cold rolling is equal to sigma0.20.1 to 0.5 times of S, σ0.2The yield strength of the magnesium alloy is shown, S is the sectional area of the coiled material, namely:
F＝kσ0.2*S
wherein k is 0.1-0.5, the value of k is in direct proportion to the pass reduction, k is 1.5-3 delta b, and delta b is the pass reduction; sigma0.2Is the yield strength of the magnesium alloy, and S is the sectional area of the coil.
Preferably, the total reduction of each rolling is 20-50%; and each rolling step comprises heat preservation for 1-3 hours at the temperature of 360-400 ℃ for annealing treatment.
Preferably, the reduction of each cold rolling is 5-20%;
the rolling speed of the cold rolling is 3-8 m/min.
The coiled material which is wound into a coil is subjected to whole-coil cold rolling so as to obviously improve the preparation efficiency and ensure the stability of the integral product quality; performing multi-fire roll rolling to realize that the thickness of the prepared magnesium alloy foil strip is within 0.1 mm; after each cold rolling, carrying out heat preservation treatment for a period of time to ensure that crystal grains in the magnesium alloy become uniform, thereby ensuring that the mechanical property of the plate-shaped magnesium material is excellent; the rolling efficiency is improved on the premise of ensuring the mechanical property of a final product by controlling the reduction of each pass, the reduction of each pass is too small, the rolling efficiency is too low, and the reduction of each pass is too large, so that the internal structure of the magnesium alloy can be damaged, and cracks and even fractures can appear.
Preferably, the magnesium alloy is an AZ31 magnesium alloy; the magnesium alloy comprises the following components in percentage by mass: 2.5 to 3.5 percent of All, 0.7 to 1.3 percent of Zns, 0.15 to 0.5 percent of Mns, less than or equal to 0.005 percent of impurity elements Fe, less than or equal to 0.03 percent of Cu, less than or equal to 0.002 percent of Ni, less than or equal to 0.005 percent of Si, and the balance of Mg. Proper raw materials are selected to ensure that the prepared product has excellent performance.
Preferably, the thickness of the magnesium plate is 2.5-3 mm; the thickness of the plate is 0.3-1 mm; the thickness of the magnesium alloy foil strip is 0.06-0.1 mm. The thickness of the raw material is gradually reduced through hot rolling, warm rolling and cold rolling, so that the strip with excellent performance is obtained, and energy is saved as far as possible.
Example 1
The embodiment provides a preparation process of a magnesium alloy foil strip, which comprises the following specific steps:
heat-preserving 10 × 150 × 800mm (height, width and length) AZ31 ingot blanks subjected to face milling at 420 ℃ for 12h for preheating, then starting hot rolling for cogging, rolling the ingot blanks to be about 2.5mm thick by 5 times of hot rolling, wherein the rolling reduction of each time of hot rolling is respectively 20%, 25%, 30% and 20%, and after each time of rolling, heat-preserving at 420 ℃ for 0.25h at the rolling speed of 10 m/min; the total rolling reduction of 5 times of hot rolling reaches 75% (the total rolling reduction is 100% -magnesium plate thickness/ingot blank height);
carrying out warm rolling on a magnesium plate with the thickness of 2.5mm after annealing treatment at the temperature of 420 ℃ for 1.5h, keeping the temperature of a roller at 180 +/-10 ℃, and carrying out warm rolling on the magnesium plate with the thickness of 0.3mm through 4 fire to obtain a plate with the thickness of 40%, 45% and 40% respectively, wherein the reduction of each fire is 40%, 45% and 40%, and each fire comprises the annealing treatment after heat preservation at the temperature of 420 ℃ for 2 h; each warm rolling respectively comprises: carrying out 2, 3, 4 and 3 times of warm rolling at the rolling speed of 8 m/min.
Curling the plate rolled to the thickness of 0.3mm, carrying out annealing treatment on the coiled material at 380 ℃ for 1.5h, and then carrying out 5-fire rolling to obtain a magnesium alloy foil strip with the thickness of 0.06 mm; the rolling reduction of each rolling is respectively 20%, 25%, 35% and 40%; each rolling coil comprises: cold rolling in 2, 3, 5 and 7 passes at a rolling speed of 3m/min and a rolling tension F of 0.1 sigma0.2*S。
Example 2
The embodiment provides a preparation process of a magnesium alloy foil strip, which comprises the following specific steps:
the method comprises the steps of preserving heat of a milled AZ31 ingot blank with the thickness of 15 x 200 x 600mm (height, width and length) at 400 ℃ for 20h for preheating, then starting hot rolling for cogging, rolling the ingot blank to the thickness of about 2.5mm through 6 times of hot rolling, wherein the rolling reduction of each time of hot rolling is respectively 20%, 25%, 30% and 20%, preserving heat at 400 ℃ for 1.5h after each time of rolling is finished, and the rolling speed is 8 m/min; the total reduction of 6-pass hot rolling reaches 83 percent;
carrying out warm rolling on a magnesium plate with the thickness of 2.5mm after heat preservation for 1.0h at 480 ℃, keeping the temperature of a roller at 250 +/-10 ℃, and carrying out warm rolling on the magnesium plate with the thickness of 0.3mm through 3 fire to obtain a plate with the thickness of 40%, 50% and 60% respectively, wherein the warm rolling on each fire comprises heat preservation for 1h at 450 ℃ and carrying out annealing treatment; each warm rolling respectively comprises: carrying out warm rolling for 3, 4 and 6 times at the rolling speed of 5 m/min.
Curling the plate rolled to the thickness of 0.3mm, carrying out annealing treatment on the coiled material at 400 ℃ for 3.0h, and carrying out 4-fire roll rolling to obtain a magnesium alloy foil strip with the thickness of 0.08 mm; the rolling reduction of each rolling is respectively 20%, 50% and 33%; each rolling coil comprises: cold rolling in 2, 6 and 4 passes at a rolling speed of 5m/min and a rolling tension F of 0.2 sigma0.2*S。
Example 3
The embodiment provides a preparation process of a magnesium alloy foil strip, which comprises the following specific steps:
preserving heat of 150 × 250 × 600mm (height, width and length) AZ31 ingot blanks subjected to face milling at 480 ℃ for 8h for preheating, then starting hot rolling for cogging, rolling the ingot blanks to be about 3.0mm thick by 7 times of hot rolling, wherein the rolling reduction of each time of hot rolling is respectively 20%, 25%, 20% and 25%, preserving heat at 480 ℃ for 0.2h after each time of rolling is finished, and the rolling speed is 15 m/min; the total reduction of 7-pass hot rolling reaches 98 percent;
carrying out warm rolling on a magnesium plate with the thickness of 3.0mm after carrying out heat preservation for 3.0h at the temperature of 400 ℃, keeping the temperature of a roller at 100 +/-10 ℃, carrying out warm rolling on the magnesium plate with the thickness of 0.3mm through 4 fire to obtain a plate with the thickness of 0.3mm, wherein the rolling reduction of each fire is 33%, 40%, 50% and 50%, and carrying out heat preservation for 3h at the temperature of 380 ℃ after each fire is carried out; each warm rolling respectively comprises: carrying out warm rolling for 3, 4, 7 and 8 times at the rolling speed of 10 m/min.
Curling the plate rolled to the thickness of 0.3mm, carrying out annealing treatment on the coiled material at 360 ℃ for 1.0h, and then carrying out 3-fire rolling to obtain a magnesium alloy foil strip with the thickness of 0.1 mm; the rolling reduction of each rolling is respectively 20%, 25% and 45%; each rolling coil comprises: cold rolling in 1, 3 and 7 passes at a rolling speed of 8m/min and a rolling tension F of 0.5 sigma0.2*S。
Example 4
This example was rolled in two different processes, the first being a rolling tension F<0.1σ0.2S, the second is F>0.5σ0.2S, other procedures were the same as in example 3.
In the first process, the finally obtained magnesium alloy foil strip has serious edge waves, and the middle of the strip is torn due to uneven strip surface, so that the product quality is unqualified.
In the second process, because the tension is too large, the edge of the strip is seriously cracked after cold rolling for 2 times, and the strip is broken during the third cold rolling, so that the strip cannot be continuously rolled.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The preparation process of the magnesium alloy foil strip is characterized by comprising the following steps of:
s1: carrying out surface milling treatment on the magnesium alloy raw material, and preheating;
s2: carrying out at least one hot rolling on the magnesium alloy raw material subjected to S1 at 400-480 ℃, and then carrying out annealing treatment at 400-480 ℃ for 1-3 h to obtain a magnesium plate;
s3: carrying out multi-fire warm rolling on the magnesium plate obtained in the step S2 to obtain a plate; each heating and rolling step comprises at least one heating and rolling step and one annealing treatment step, wherein the temperature of a roller for heating and rolling is controlled to be 100-280 ℃;
s4: coiling the plate obtained in the step S3 into coiled material, carrying out annealing treatment on the coiled material at 380-450 ℃ for 1-3 h, and then carrying out multi-fire rolling at room temperature to obtain a magnesium alloy foil strip; each rolling comprises at least one cold rolling and one annealing treatment;
the rolling tension F of each cold rolling is equal to sigma0.20.1 to 0.5 times of S, σ0.2Is the yield strength of the magnesium alloy, and S is the sectional area of the coil.
2. The process for preparing a magnesium alloy foil strip according to claim 1, wherein the magnesium alloy is an AZ31 magnesium alloy; the magnesium alloy comprises the following components in percentage by mass: 2.5 to 3.5 percent of All, 0.7 to 1.3 percent of Zns, 0.15 to 0.5 percent of Mns, less than or equal to 0.005 percent of impurity elements Fe, less than or equal to 0.03 percent of Cu, less than or equal to 0.002 percent of Ni, less than or equal to 0.005 percent of Si, and the balance of Mg.
3. The process for preparing the magnesium alloy foil strip according to claim 1, wherein the preheating temperature in S1 is 400-480 ℃ and the preheating time is 8-20 hours.
4. The process for preparing the magnesium alloy foil strip according to claim 1, wherein in S2, the temperature is kept at 400-480 ℃ for 0.2-1.5 h after each hot rolling, and the reduction of each hot rolling is 10-40%;
the hot rolling speed is 8-15 m/min.
5. The process for preparing a magnesium alloy foil strip according to claim 4, wherein the total reduction of the multi-pass hot rolling is 60 to 98%.
6. The process for preparing the magnesium alloy foil strip according to claim 1, wherein in S3, the total reduction amount per hot rolling is 30-60%; each hot rolling step comprises heat preservation for 1-3 hours at 380-450 ℃ for annealing treatment.
7. The process for preparing the magnesium alloy foil strip according to claim 6, wherein the reduction of each warm rolling pass is 5-20%;
the rolling speed of warm rolling is 5-10 m/min.
8. The process for preparing the magnesium alloy foil strip according to claim 1, wherein in S4, the total rolling reduction per fire is 20-50%; and each rolling step comprises heat preservation for 1-3 hours at the temperature of 360-400 ℃ for annealing treatment.
9. The process for preparing the magnesium alloy foil strip according to claim 8, wherein the reduction of each cold rolling is 5-20%;
the rolling speed of the cold rolling is 3-8 m/min.
10. The process for preparing a magnesium alloy foil strip according to claim 1, wherein the magnesium plate has a thickness of 2.5 to 3 mm; the thickness of the plate is 0.3-1 mm; the thickness of the magnesium alloy foil strip is 0.06-0.1 mm.
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| CN1478914A (en) * | 2002-08-30 | 2004-03-03 | 无锡银邦铝业有限公司 | Aluminium foil and its production method |
| EP1480490A1 (en) * | 2003-05-20 | 2004-11-24 | Pioneer Corporation | Magnesium speaker diaphragm, method of manufacturing the same, and speaker with such a diaphragm |
| CN107159712A (en) * | 2017-03-27 | 2017-09-15 | 清华大学深圳研究生院 | A kind of magnesium alloy foil preparation method |
| CN110142299A (en) * | 2019-06-20 | 2019-08-20 | 辽宁科技大学 | A kind of magnesium alloy thin strip rolling tensile force deployment device and its method |
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2019
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| CN1478914A (en) * | 2002-08-30 | 2004-03-03 | 无锡银邦铝业有限公司 | Aluminium foil and its production method |
| EP1480490A1 (en) * | 2003-05-20 | 2004-11-24 | Pioneer Corporation | Magnesium speaker diaphragm, method of manufacturing the same, and speaker with such a diaphragm |
| CN107159712A (en) * | 2017-03-27 | 2017-09-15 | 清华大学深圳研究生院 | A kind of magnesium alloy foil preparation method |
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Address after: 410000 East, 2nd, 7th and 8th floors of building B8, luguyuyuan, No. 27, Wenxuan Road, high tech Development Zone, Changsha City, Hunan Province Patentee after: Aerospace Science and Industry (Changsha) New Materials Research Institute Co.,Ltd. Address before: 410000 East, 2nd, 7th and 8th floors of building B8, luguyuyuan, No. 27, Wenxuan Road, high tech Development Zone, Changsha City, Hunan Province Patentee before: CHANGSHA ADVANCED MATERIALS INDUSTRIAL RESEARCH INSTITUTE Co.,Ltd. |
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