CN110508617B - Crease rolling and thinning device and processing method for weak basal plane texture magnesium alloy plate strip - Google Patents
Crease rolling and thinning device and processing method for weak basal plane texture magnesium alloy plate strip Download PDFInfo
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- CN110508617B CN110508617B CN201910721869.8A CN201910721869A CN110508617B CN 110508617 B CN110508617 B CN 110508617B CN 201910721869 A CN201910721869 A CN 201910721869A CN 110508617 B CN110508617 B CN 110508617B
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 160
- 238000005096 rolling process Methods 0.000 title claims abstract description 48
- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 239000013078 crystal Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 12
- 239000010439 graphite Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 244000137852 Petrea volubilis Species 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- 235000019441 ethanol Nutrition 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 abstract description 10
- 230000003313 weakening effect Effects 0.000 abstract description 6
- 239000004033 plastic Substances 0.000 abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 239000011777 magnesium Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- Mechanical Engineering (AREA)
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A creasing, rolling and thinning device and a processing method for a magnesium alloy plate strip with weak base texture belong to the technical field of rolling process methods for improving the forming performance of the magnesium alloy plate strip, can solve the problems that the existing method for weakening the base texture of magnesium alloy is complex and is not easy to realize continuity, a deformation cavity is added in a feeding channel to enable a magnesium alloy blank to crease under the action of a rotary male die to be deformed into an inverted V-shaped blank plate, crystal grains are induced to incline towards a cavity surface, then the blank plate is subjected to next-step rolling deformation through a roller, the position of the blank plate before rolling is inclined at a certain angle with a feed inlet of the roller, the distance between the rollers is smaller than the thickness of the blank plate, the magnesium alloy blank undergoes a process of shearing plastic deformation and rolling thinning, and further multi-pass continuous creasing-rolling thinning is carried out to carry out deformation processing on the magnesium, the magnesium alloy plate with the uniform structure and the weak base surface texture.
Description
Technical Field
The invention belongs to the technical field of rolling process methods for improving the forming performance of magnesium alloy plate strips, and particularly relates to a fold rolling and thinning device and a processing method for weak base texture magnesium alloy plate strips.
Background
Magnesium and its alloys have received much attention as a structural material due to its good workability and high damping capacity. The lightweight, approximately aluminum 2/3, iron 1/4, has great potential in improving fuel efficiency and reducing carbon dioxide emissions, and in combination with their high specific strength and specific stiffness characteristics, magnesium alloys have become the ideal choice for aircraft and automotive structural applications, however, because of the special crystal structure (close-packed hexagonal crystal structure), the magnesium alloy crystal lattice has limited slip system at normal temperature, only 2 independent slip systems start, and the requirements of 5 independent slip systems required by plastic deformation cannot be met, so the magnesium alloy has poor mechanical property and room temperature forming property, and deformation texture is easy to form in the processing process, the appearance of the texture can obviously influence the performance of the magnesium alloy, for example, phenomena such as anisotropy, tension-compression asymmetry and the like occur, which limit the application and industrial popularization of magnesium alloys, and therefore, the preparation of high-performance magnesium alloys by weakening the basal plane texture is a problem to be solved urgently at present.
At the present stage, people want to improve the forming performance of magnesium alloy, often choose to add alloy elements into magnesium alloy or introduce shear deformation into magnesium alloy to weaken the texture of the basal plane, such as Equal Channel Angular Pressing (ECAP) and other technologies, which not only can effectively refine crystal grains, but also can weaken the texture of the basal plane and improve the strength and plasticity of metal. However, the deformation mode of the technology is complex, the continuity is not easy to realize, the size of the obtained product is small, the industrial production is difficult to realize, and the application of the magnesium alloy is limited to a certain extent.
Disclosure of Invention
The invention provides a creasing-rolling thinning device and a processing method for a magnesium alloy plate strip with weak basal plane texture, aiming at the problems that the existing method for weakening the basal plane texture of magnesium alloy is complex and is not easy to realize continuity. The magnesium alloy blank is wrinkled under the action of a rotary male die by adding a deformation cavity in a feeding channel to be deformed into an inverted V-shaped blank plate, crystal grains are induced to incline towards a cavity surface, then the blank plate is subjected to next-step rolling deformation through a roller, the position of the blank plate before rolling is inclined at a certain angle with a feed port of the roller, the distance between the rollers is smaller than the thickness of the blank plate, the magnesium alloy blank undergoes a shearing plastic deformation and rolling reduction process, and further multi-pass continuous creasing-rolling reduction is carried out on the magnesium alloy to prepare the magnesium alloy plate with the weak base texture, fine crystal grains and uniform tissue.
The invention adopts the following technical scheme:
the utility model provides a rolling attenuate device of pincher trees of weak basal plane texture magnesium alloy plate strip, including transfer roller I, transfer roller II, rotatable terrace die, top roll and bottom roll, the terrace die is located between transfer roller II and the bottom roll, transfer roller I and transfer roller II pass through the conveyer belt and connect, the terrace die is located the terrace die intracavity, the both ends of terrace die chamber are equipped with feed inlet and discharge gate respectively, the feed inlet is located the one end that is close to transfer roller II, the discharge gate is located the one end that is close to the bottom roll, the top of terrace die is the shape of falling V, distance between top roll and the bottom roll is less than the.
The axes of the conveying roller I and the conveying roller II are located on the same horizontal line.
The upper ends of the conveying roller I and the conveying roller II are flush with the lower end of the feeding hole.
The center of the top end of the male die and the center of the male die are located on the same axis.
The section of the male die is a regular polygon, each corner of the male die is provided with a fillet, and the radiuses of the fillets are the same.
A creasing, rolling and thinning processing method of a weak base texture magnesium alloy plate strip comprises the following steps:
first step, selecting materials and chemical reagents: magnesium alloy blanks, solid sheets; sand paper, solid state; high temperature graphite oil solution, liquid; absolute ethyl alcohol, liquid; acetone, liquid;
step two, pretreating the magnesium alloy blank:
(1) the outer surface of the magnesium alloy blank is polished by 600-mesh abrasive paper, oil stains are removed, and then the magnesium alloy blank is sequentially polished by 1000-mesh, 1200-mesh and 2500-mesh abrasive paper, so that the surface is clean and smooth;
(2) preparing a mixed solution from acetone and absolute ethyl alcohol according to the volume ratio of 3:2, and uniformly stirring;
(3) placing the magnesium alloy blank in the mixed solution, carrying out ultrasonic cleaning for 30min, taking out after cleaning, cleaning with absolute ethyl alcohol, and drying with a blower by cold air;
thirdly, preheating a magnesium alloy blank:
starting a vacuum atmosphere heating furnace, setting the preset temperature at 300 ℃, and heating the magnesium alloy blank in the vacuum atmosphere heating furnace for 1-4 hours;
fourthly, processing the magnesium alloy blank:
(1) heating a male die, an upper roller and a lower roller by a resistance wire, keeping the initial position of the top of the male die flush with the bottom of a male die cavity, coating a high-temperature graphite oil solution on a preheated magnesium alloy blank for lubrication after heating to 300 ℃, feeding the magnesium alloy blank from a feeding port of the male die cavity by a conveying roller I and a conveying roller II which are matched with a conveying belt, enabling the magnesium alloy blank to be in contact with the upper roller, reducing the temperature after the magnesium alloy blank is placed into the feeding port due to the temperature difference between the feeding port and the magnesium alloy blank, standing for 10 minutes after the blank is in contact with the upper roller to enable the upper roller and the magnesium alloy blank to be balanced to 300 ℃, starting the conveying belt and rotating the male die to enable the magnesium alloy blank to have the tendency of moving from left to right, and stopping the magnesium alloy blank at one side of the upper roller because the distance between the upper roller and the, after the action of a male die on the magnesium alloy blank, the magnesium alloy blank is wrinkled, grains are induced to incline towards a cavity surface, then the magnesium alloy blank is subjected to next-step rolling deformation through an upper roller and a lower roller, the position of a blank plate before rolling is inclined at 30 degrees with a roller feed port, the distance between the upper roller and the lower roller is smaller than the thickness of the blank plate, the upper roller and the lower roller are opened, the plate is fed rightwards in an inverted V shape, the male die rotates clockwise, the right side of the magnesium alloy blank is inclined at 30 degrees with the upper roller and the lower roller, the inverted V-shaped blank is subjected to a rolling and thinning process through the upper roller and the lower roller, and then the magnesium alloy blank is discharged from the other side of the upper roller and the lower roller;
(2) reducing the gap distance between the upper roller and the lower roller, reheating the magnesium alloy plate blank to 300 ℃, coating the high-temperature graphite oil solution again, repeating the step (1), and performing subsequent multi-pass continuous creasing-rolling thinning processing to finally obtain the magnesium alloy sheet with fine grains and weak texture;
(3) after the processing is finished, the heating resistance wire is closed, and the upper roller and the lower roller are closed;
(4) taking out the magnesium alloy sheet, polishing the surface of the magnesium alloy sheet by using sand paper, cleaning the magnesium alloy sheet by using an acetone and ethanol mixed solution, cleaning the magnesium alloy sheet by using absolute ethyl alcohol, and finally drying the magnesium alloy sheet by using a blower with cold air.
The principle of preparing the weak texture high-performance magnesium alloy plate by continuous creasing-rolling thinning is as follows:
under the action of the male die, the magnesium alloy plate blank is subjected to crumple deformation in the male die cavity, the magnesium alloy plate blank flows in the male die cavity at a different speed due to the difference between the inner structure of the male die cavity and the male die structure, so that shearing deformation occurs, the crystal grain c of the magnesium alloy plate is inclined in the axial shearing plane, the texture of a base surface is weakened, the crystal grain is refined, the rolling force is reduced, and the further rolling deformation process is coordinated; the magnesium alloy plate blank after being folded is in an inverted V shape and is in contact with the upper roller and the lower roller at a certain angle, and because a certain angle exists between the plate feeding position and a feeding hole between the upper roller and the lower roller, the magnesium alloy blank flows at a differential speed in the rolling process and generates shearing deformation again, the axial shearing surface of the crystal grain c is inclined, the crystal grain is refined, and the base texture is weakened; the distance between the upper roller and the lower roller is smaller than the plate thickness, the magnesium alloy plate blank becomes thin after being rolled, the magnesium alloy plate blank is further processed for multiple times, and the performance is improved due to the refinement of crystal grains and the weakening of texture of the magnesium alloy plate.
The invention has the following beneficial effects:
compared with the background technology, the method has obvious advancement, aiming at the condition that the strength, the plasticity and the forming performance of the magnesium alloy are poor, the continuous creasing-rolling thinning processing method is adopted, so that the magnesium alloy generates shearing plastic deformation, the creasing deformation of the sheet material by rotating the male die every time and the shearing deformation between the roller and the sheet material can promote the crystal grains of the magnesium alloy sheet material to be refined, and the axial shearing plane of the crystal grains is inclined as shown in figure 4, thereby weakening the (0001) basal plane texture; the processing method of the weak basal plane texture magnesium alloy plate is simple, has low cost, greatly reduces the requirement on the tonnage of equipment, has good large-scale application prospect, and is an ideal method for improving the strength and the plasticity of the magnesium alloy. By the continuous creasing-rolling thinning processing method, the average grain size of the magnesium alloy is greatly reduced compared with the original magnesium alloy plate, and the texture strength is greatly reduced. The refinement of crystal grains and the weakening of basal plane texture are beneficial to the improvement of mechanical properties such as strength, plasticity and the like and stamping forming property of the magnesium alloy.
Drawings
FIG. 1 is a schematic view of the initial placement of a magnesium alloy sheet blank according to the present invention;
FIG. 2 is a schematic view showing an inverted V-shape deformation of a magnesium alloy sheet blank according to the present invention;
FIG. 3 is a schematic view showing the processing of a magnesium alloy sheet blank according to the present invention;
FIG. 4 is a schematic view showing the grain deflection of a magnesium alloy sheet blank according to the present invention;
FIG. 5 is a schematic structural view of a male mold according to an embodiment of the present invention;
FIG. 6 is a TEM image of a continuously crumpling-rolling thinned magnesium alloy sheet according to an embodiment of the present invention;
FIG. 7 is a polar view of a magnesium alloy sheet (0001) continuously rolled and thinned according to an embodiment of the present invention;
wherein: 1-a conveying roller I; 2-conveying roller II; 3-a conveyor belt; 4-a male die; 5, rolling the upper roller; 6-lower roller; 7-a feed inlet; 8-blank; 9-relief cavity.
Detailed Description
Examples
The amount of chemical agent and high temperature resistant graphite required for processing the magnesium alloy sheet is determined according to a preset proportion range, and the chemical agent and the high temperature resistant graphite are measured in millimeter, milliliter and gram.
(1) Selection of materials, chemical reagents
Magnesium alloy blank: the AZ31 magnesium alloy solid plate contains 96% of magnesium, 3.0% of aluminum and 1.0% of zinc.
Sand paper: a solid;
high-temperature graphite oil solution: a liquid;
anhydrous ethanol: liquid, 99.5%;
acetone: liquid, 99%;
(2) pretreating magnesium alloy blank
Firstly, polishing the outer surface of a magnesium alloy blank by 600-mesh abrasive paper to remove oil stains, and then sequentially polishing by 1000-mesh, 1200-mesh and 2500-mesh abrasive paper to ensure that the surface is clean and smooth;
adding acetone and absolute ethyl alcohol into a cleaning tank according to the volume ratio of 3:2, stirring and mixing to prepare a mixed solution of acetone and absolute ethyl alcohol;
thirdly, placing the magnesium alloy blank into an acetone and alcohol solution, then placing a cleaning tank on an ultrasonic cleaning machine for ultrasonic cleaning for 30min, taking out the blank, cleaning the blank with absolute ethyl alcohol, and then drying the blank with a blower by cold air;
(3) preheating magnesium alloy blank
Starting a vacuum atmosphere heating furnace, setting the preset temperature to be 300 ℃, placing the magnesium alloy blank into the heating furnace when the preset temperature is reached, and preserving heat for 2.0 hours;
(4) processing magnesium alloy blanks
Firstly, heating a male die 4, an upper roller 5 and a lower roller 6 by a resistance wire, keeping the initial position of the top of the male die 4 level with the bottom of a male die cavity 9, coating a high-temperature graphite oil solution on a preheated magnesium alloy blank for lubrication after the temperature is raised to 300 ℃, feeding the magnesium alloy blank from a feed inlet 7 of the male die cavity 9 by a conveying roller I1 and a conveying roller II 2 which are matched with a conveying belt 3, so that the magnesium alloy blank is contacted with the upper roller, as shown in figure 1, the temperature of the magnesium alloy blank is reduced after the magnesium alloy blank is placed into the feed inlet 7 due to the temperature difference between the feed inlet 7 and the magnesium alloy blank, standing for 10 minutes after the blank is contacted with the upper roller 5, so that the upper roller 5 and the magnesium alloy blank are balanced to 300 ℃, starting the conveying belt 3 and rotating the male die 4, so that the magnesium alloy blank has the trend of moving from left to right, and because the distance between the, at this time, the magnesium alloy blank is blocked at one side of the upper roller 5, after the magnesium alloy blank is acted by the punch 4, the magnesium alloy blank is creased to induce the crystal grains to incline towards the cavity surface, then the magnesium alloy blank is subjected to next-step rolling deformation by the upper roller 5 and the lower roller 6, the position of the blank plate before rolling is inclined at 30 degrees with the feed port of the rollers, and the distance between the upper roller 5 and the lower roller 6 is smaller than the thickness of the blank plate, as shown in figure 2. And (3) starting the upper roller 5 and the lower roller 6, feeding the plate in an inverted V shape to the right, rotating the male die 4 clockwise, inclining the right side of the magnesium alloy blank by 30 degrees with the upper roller 5 and the lower roller 6, rolling and thinning the inverted V-shaped blank by the upper roller 5 and the lower roller 6, and discharging from the other sides of the upper roller 5 and the lower roller 6 to obtain the magnesium alloy plate blank in one pass.
Secondly, preheating the magnesium alloy plate blank rolled in one step at 300 ℃ for 10 minutes, coating high-temperature graphite oil solution again, adjusting the gap between an upper roller 5 and a lower roller 6 of the rolling mill, repeating the step I, and performing 2-pass shearing rolling deformation, so that the magnesium alloy plate AZ31 with the thickness of 1mm is obtained finally through multi-pass rolling deformation.
And thirdly, after the machining is finished, the heating resistance wire is closed, and the roller is closed.
And fourthly, taking out the magnesium alloy sheet, polishing the surface of the magnesium alloy sheet by using sand paper, cleaning the magnesium alloy sheet by using an acetone and ethanol mixed solution, cleaning the magnesium alloy sheet by using absolute ethyl alcohol, and finally drying the magnesium alloy sheet by using a blower through cold air.
And (4) conclusion: by the continuous creasing-rolling thinning process method, the average grain size of the magnesium alloy is greatly reduced compared with the conventional magnesium alloy, the grain size is reduced to 3.2 mu m from 32 mu m, the texture strength of a (0001) basal plane is reduced to 5.2 from 27.6 compared with the conventional magnesium alloy, the cup-drawing value at room temperature reaches 6.2 mm, and the average grain size is improved by nearly 1 time compared with a normally rolled commercial AZ31 magnesium alloy (the cup-drawing value is about 3mm generally) plate with the thickness of 1 mm.
The used materials and the chemical reagent magnesium alloy block are as follows: AZ31 magnesium alloy plate blank, 100mm × 60mm × 5 mm; sand paper: SiC, 600 meshes, 2 sheets; 2 pieces of 1000 meshes; 1200 meshes and 2 sheets; 2500 meshes, 2 sheets; high-temperature graphite oil solution: c, 30 ml; anhydrous ethanol: CH (CH)3CH2OH, 1200 ml; acetone: c3H6O，800ml。
The average grain size of the magnesium alloy is greatly reduced compared with the conventional magnesium alloy, the grain size is reduced from 32 mu m to 3.2 mu m, and the (0001) basal plane texture strength is reduced from 27.6 to 5.2 compared with the conventional magnesium alloy. The cupping value at room temperature reaches 6.2 mm, and is improved by nearly 1 time compared with a normally rolled commercial AZ31 magnesium alloy plate with the thickness of 1mm (the cupping value is about 3mm generally).
The shape of the rotatable male die 4 is not fixed and can be regular triangle, regular quadrangle, regular pentagon and the like, and the radius of the fillet of the male die is r1、r2、r3Etc. wherein r1＝r2＝r3… …, the magnitude of r is not specified by a certain value; the side length of the male die is respectively l1、l2、l3Etc. wherein l1＝l2＝l3The size of = … …, l is not specified by a certain value.
By controlling the speed n of the upper and lower rolls1、n2To realize the conventional rolling (n)1=n2) Differential rolling (n)1≠n2) Different types of rolling processes; the deformation of the magnesium alloy sheet can be controlled by controlling the distance between the upper roll and the lower roll.
In the whole processing process, the male die continuously deforms the magnesium alloy plate blank and folds the magnesium alloy plate blank into an inverted V-shaped blank plate, a further roller continuously rolls and thins the magnesium alloy plate blank plate at a certain angle, the continuous folding-rolling thinning process of the magnesium alloy plate blank plate continuously occurs, the base texture is weakened while the crystal grains are thinned, and the purpose of preparing the high-performance magnesium alloy plate is achieved, so that the industrial application of the magnesium alloy is promoted, and the application range of the magnesium alloy is expanded.
Claims (6)
1. The utility model provides a pincher trees rolling attenuate device of weak basal plane texture magnesium alloy plate strip which characterized in that: including transfer roller I (1), transfer roller II (2), rotatable terrace die (4), top roll (5) and bottom roll (6), terrace die (4) are located between transfer roller II (2) and bottom roll (6), transfer roller I (1) and transfer roller II (2) are connected through conveyer belt (3), terrace die (4) are located terrace die chamber (9), the both ends of terrace die chamber (9) are equipped with feed inlet (7) and discharge gate respectively, feed inlet (7) are located the one end that is close to transfer roller II (2), the discharge gate is located the one end that is close to bottom roll (6), the top of terrace die (4) is the shape of falling V-arrangement, distance between top roll (5) and bottom roll (6) is less than the width of discharge gate.
2. The creasing, rolling and thinning device for the weak base texture magnesium alloy plate strip as claimed in claim 1, is characterized in that: the axes of the conveying roller I (1) and the conveying roller II (2) are positioned on the same horizontal line.
3. The creasing, rolling and thinning device for the weak base texture magnesium alloy plate strip as claimed in claim 1, is characterized in that: the upper ends of the conveying roller I (1) and the conveying roller II (2) are flush with the lower end of the feeding hole (7).
4. The creasing, rolling and thinning device for the weak base texture magnesium alloy plate strip as claimed in claim 1, is characterized in that: the center of the top end of the male die (4) and the center of the male die (4) are located on the same axis.
5. The creasing, rolling and thinning device for the weak base texture magnesium alloy plate strip as claimed in claim 1, is characterized in that: the cross section of the male die (4) is a regular polygon, each corner of the male die (4) is rounded, and the radius of each rounded corner is the same.
6. A processing method of the creasing, rolling and thinning device for the weak base texture magnesium alloy plate strip as claimed in any one of claims 1 to 5 is characterized in that: the method comprises the following steps:
first step, selecting materials and chemical reagents: magnesium alloy blanks, solid sheets; sand paper, solid state; high temperature graphite oil solution, liquid; absolute ethyl alcohol, liquid; acetone, liquid;
step two, pretreating the magnesium alloy blank:
(1) the outer surface of the magnesium alloy blank is polished by 600-mesh abrasive paper, oil stains are removed, and then the magnesium alloy blank is sequentially polished by 1000-mesh, 1200-mesh and 2500-mesh abrasive paper, so that the surface is clean and smooth;
(2) preparing a mixed solution from acetone and absolute ethyl alcohol according to the volume ratio of 3:2, and uniformly stirring;
(3) placing the magnesium alloy blank in the mixed solution, carrying out ultrasonic cleaning for 30min, taking out after cleaning, cleaning with absolute ethyl alcohol, and drying with a blower by cold air;
thirdly, preheating a magnesium alloy blank:
starting a vacuum atmosphere heating furnace, setting the preset temperature at 300 ℃, and heating the magnesium alloy blank in the vacuum atmosphere heating furnace for 1-4 hours;
fourthly, processing the magnesium alloy blank:
(1) firstly, a male die (4), an upper roller (5) and a lower roller (6) are heated through resistance wires, the initial position of the top of the male die (4) is equal to the bottom of a male die cavity (9), a preheated magnesium alloy blank is coated with a high-temperature graphite oil solution for lubrication after being heated to 300 ℃, the magnesium alloy plate blank is fed from a feed port (7) of the male die cavity (9) through a conveying roller I (1) and a conveying roller II (2) in a manner of being matched with a conveying belt (3), so that the magnesium alloy plate blank is contacted with the upper roller (5), the temperature of the magnesium alloy plate blank is reduced after being placed into the feed port (7) due to the temperature difference between the feed port (7) and the magnesium alloy plate blank, the upper roller (5) and the magnesium alloy blank are balanced to 300 ℃ after the blank is contacted with the upper roller (5) and then the blank is kept stand for 10 minutes, the conveying belt (3) and the male die (4) are opened, because the distance between the upper roller (5) and the lower roller (6) is smaller than the thickness of the blank, the magnesium alloy blank is blocked at one side of the upper roller (5), after the magnesium alloy blank is acted by the convex die (4), the magnesium alloy blank is wrinkled, crystal grains are induced to incline towards the cavity surface, then the magnesium alloy blank is rolled and deformed by the upper roller (5) and the lower roller (6) in the next step, the position of the blank plate before rolling forms an inclination angle of 30 degrees with the roller feed port (7), the distance between the upper roller (5) and the lower roller (6) is smaller than the thickness of the blank plate, the upper roller (5) and the lower roller (6) are opened, the plate is fed rightwards in an inverted V shape, the convex die (4) rotates clockwise, the right side of the magnesium alloy blank forms an inclination angle of 30 degrees with the upper roller (5) and the lower roller (6), and the inverted V-shaped blank is rolled by the upper roller (5) and the lower, then discharging from the other side of the upper roller (5) and the lower roller (6) to obtain a magnesium alloy plate blank in one pass;
(2) reducing the gap distance between the upper roller (5) and the lower roller (6), reheating the magnesium alloy plate blank of one pass to 300 ℃, coating the high-temperature graphite oil solution again, repeating the step (1), and performing the subsequent multi-pass continuous crumpling-rolling thinning processing to finally obtain the magnesium alloy sheet with fine grains and weak texture;
(3) after the processing is finished, the heating resistance wire is closed, and the upper roller and the lower roller are closed;
(4) taking out the magnesium alloy sheet, polishing the surface of the magnesium alloy sheet by using sand paper, cleaning the magnesium alloy sheet by using an acetone and ethanol mixed solution, cleaning the magnesium alloy sheet by using absolute ethyl alcohol, and finally drying the magnesium alloy sheet by using a blower with cold air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910721869.8A CN110508617B (en) | 2019-08-06 | 2019-08-06 | Crease rolling and thinning device and processing method for weak basal plane texture magnesium alloy plate strip |
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| CN113441547B (en) * | 2021-07-02 | 2022-08-16 | 太原理工大学 | Method for improving corrugated continuous rolling of magnesium/aluminum composite plate by head pre-bending |
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| CN103706663B (en) * | 2013-12-30 | 2015-09-09 | 重庆理工大学 | A kind of high ductibility magnesium alloy sheet material fast processing method and device |
| CN104646416B (en) * | 2015-01-16 | 2016-08-17 | 湖南科技大学 | A kind of sheet metal Strong shear roll-forming method and device |
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