CN113770175A - Method for rolling magnesium alloy plate without edge cracking at low temperature and large pass reduction - Google Patents
Method for rolling magnesium alloy plate without edge cracking at low temperature and large pass reduction Download PDFInfo
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- CN113770175A CN113770175A CN202111163955.5A CN202111163955A CN113770175A CN 113770175 A CN113770175 A CN 113770175A CN 202111163955 A CN202111163955 A CN 202111163955A CN 113770175 A CN113770175 A CN 113770175A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 120
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005336 cracking Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
-
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
-
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for rolling a magnesium alloy plate without edge cracking at low temperature and large pass reduction, which comprises the following steps: step 1), mounting a magnesium alloy plate on a rolling mill, wherein the temperature of the rolling mill is 180-210 ℃; step 2), heating the mounted magnesium alloy plate to a set rolling temperature on line, wherein the rolling temperature is 150-170 ℃; step 3) after the magnesium alloy plate is heated to a set rolling temperature, performing single-pass rolling, wherein the pass rolling reduction is 40-53%, and the rolling speed is 0.05-0.1 m/s; and 4) unloading to obtain a magnesium alloy rolling sample after single-pass rolling is finished. The method of the invention can greatly save rolling time, reduce energy consumption and greatly reduce production cost, and the rolled plate is straight and has good plate shape, meanwhile, the rolling process is simple and easy to operate, and is very suitable for industrial production.
Description
Technical Field
The invention relates to the technical field of magnesium alloy processing, in particular to a method for rolling a magnesium alloy plate without edge cracking at low temperature and large pass reduction.
Background
The magnesium alloy is taken as the lightest metal structure material, is known as a green engineering material in the 21 st century, and has great development potential. Meanwhile, the composite material has the excellent performances of light weight, high specific strength, large elastic modulus, excellent shock resistance, electromagnetic shielding and the like, so that the composite material is widely applied to the fields of electronic products, automobile industrial production, aerospace and the like.
With the development of society, the demand for high-performance wrought magnesium alloys (such as plates, bars and the like) is increasing. Rolling is one of the main methods for producing magnesium alloy sheet materials at present. The rolling can refine the texture of the magnesium alloy and obviously improve the mechanical property of the magnesium alloy. Due to the close-packed hexagonal crystal structure of the magnesium alloy, the plastic forming capability is poor at medium and low temperature, and the plate is easy to have serious defects such as edge crack and the like in the common traditional rolling process. The edge material is cut off in the subsequent further rolling, so that the yield of the magnesium alloy rolled plate is greatly reduced, and the application of the magnesium alloy is severely limited. Therefore, the edge crack problem becomes a hot spot problem in the processing process of the magnesium alloy at present, and the research of the process method for reducing or inhibiting the edge crack of the magnesium alloy rolling has very important practical significance.
At present, more magnesium alloy rolling processes are adopted; the processes of cross rolling, asynchronous rolling, edge pre-convexity, corrugating rolling and the like have obvious inhibition effect on the rolling edge crack of the magnesium alloy plate, but the methods have the following defects: 1) because the magnesium alloy plate has large heat conductivity coefficient, the temperature of the rolled plate is obviously reduced after the rolled plate is kept at the rolling temperature in the heating furnace and is transferred to a roller for rolling, and edge cracking is more easily caused; 2) the rolled magnesium alloy plate may have a bent shape, and the shape cannot be effectively controlled; 3) in the rolling process, in order to inhibit the generation of edge cracks, high temperature (more than 350 ℃) is generally adopted for rolling, energy is consumed, and in order to eliminate the work hardening of the plate in the rolling process, the plate needs to be annealed for several minutes in the process of pass, so that the rolling time is prolonged; in addition, the preparation of the sample for rolling the edge prefabricated convexity is troublesome, the corrugated rolling process needs to be carried out on corrugated rollers firstly and then flat rollers, the rolling process is complicated, and the plates rolled at the middle and low temperature by cross rolling and asynchronous rolling still have edge cracks.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for rolling a magnesium alloy plate without edge cracking at low temperature and large pass reduction, so as to solve the problems of low efficiency in the rolling process of the magnesium alloy plate and edge cracking after rolling in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for rolling a magnesium alloy plate without edge cracking at low temperature and large pass reduction comprises the following steps:
step 1) mounting a magnesium alloy plate on a rolling mill; wherein the temperature of the roller is 180-210 ℃, and the tension of the left end and the right end is 2 kN;
step 2), heating the mounted magnesium alloy plate to a set rolling temperature on line, wherein the set rolling temperature is 150-170 ℃;
step 3) immediately carrying out single-pass rolling after the magnesium alloy plate is heated to the set rolling temperature, wherein the pass rolling reduction is 40-53%, and the rolling speed is 0.05-0.1 m/s;
and 4) unloading to obtain a magnesium alloy rolled sample without edge cracks after single-pass deformation rolling is finished.
Compared with the prior art, the invention has the following beneficial effects:
1. the method can effectively reduce the temperature reduction of the plate by on-line heating rolling, and can improve the edge deformation capability of the plate, thereby inhibiting the occurrence of edge cracks in the rolling process, and can roll and produce the magnesium alloy plate without obvious edge cracks on the plate surface at a high reduction under a medium and low temperature, thereby improving the yield of the plate.
2. The method of the invention can greatly save rolling time, reduce energy consumption and greatly reduce production cost, and the rolled plate is straight and has good plate shape, meanwhile, the rolling process is simple and easy to operate, and is very suitable for industrial production.
Drawings
FIG. 1 is a photograph of a plate made of AZ31 magnesium alloy of example 1, prepared by on-line hot rolling at 42.2% pass reduction.
FIG. 2 is a photograph of a ZM21 plate of the magnesium alloy of example 4 prepared by in-line hot rolling at 42.4% pass reduction.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Firstly, magnesium alloy ingots are extruded into plates of 600mm x 105mm x 5mm at 330 ℃, and then the extruded plates are rolled into magnesium alloy plates by using a four-roller online heating rolling mill.
Method for rolling magnesium alloy plate without edge cracking at low temperature and large pass reduction
EXAMPLE 1 preparation of AZ31 magnesium alloy sheet by in-line hot rolling with 42.2% pass reduction
Step 1) size specification 600 × 105 × 5 (unit: mm) of AZ31 magnesium alloy sheet was mounted on a rolling mill and the sheet was clamped by chucks at both ends thereof in preparation for rolling. Wherein the rolling temperature is set to be 150 ℃, the temperature of a roller for rolling is 190 ℃, and the tension of the left end and the right end is 2 kN; the rolling mill is a high-rigidity hydraulic tension four-roller warm-rolling reversible experimental rolling mill, and is provided with four rollers, namely a supporting roller with the diameter of 320mm and a working roller with the diameter of 120 mm.
Step 2): the mounted magnesium alloy plate is automatically heated to the set temperature of 150 ℃ through current, the temperature is measured through a contact thermocouple, and the time for heating to the set temperature is about 45 s.
Step 3): when the magnesium alloy plate is heated to the set rolling temperature, single-pass rolling is immediately carried out, the pass rolling reduction is 42.2%, and the rolling speed is 0.05 m/s. The magnesium alloy plate is heated on line before rolling to ensure accurate rolling temperature.
Step 4): and after the single-pass deformation rolling is finished, unloading to obtain a magnesium alloy rolled sample without edge cracks.
And after the single-pass deformation rolling is finished, unloading the magnesium alloy rolled sample to finally obtain the magnesium alloy plate with the thickness of 2.89 mm. The rolled plate is shown in FIG. 1.
In this embodiment, the time taken for the magnesium alloy sheet to pass through 1 pass from 5mm to 2.89mm can be controlled to be about 1 min. And observing the macroscopic morphology of the plate after the rolling is finished, wherein the result shows that no obvious edge crack appears on the rolled surface.
Examples 2 to 3 were prepared using the same magnesium alloy sheet material and rolling method as in example 1, except that the reduction amount in example 2 was 40% and the reduction amount in example 3 was 52%. The macroscopic appearances of the plates in the example 2 and the example 3 are respectively observed after the rolling is finished, and the result shows that no obvious edge crack appears on the rolled surface.
EXAMPLE 4 preparation of ZM21 magnesium alloy sheet by in-line heating and rolling at 42.4% reduction
Step 1): a ZM21 magnesium alloy sheet with a gauge of 600 × 105 × 5 (unit: mm) was mounted on a rolling mill and was prepared for rolling by clamping the sheet with clamps at both ends. Wherein the rolling temperature is set to be 150 ℃, the temperature of a roller for rolling is 190 ℃, and the tension of the left end and the right end is 2 kN; the rolling mill is a high-rigidity hydraulic tension four-roller warm-rolling reversible experimental rolling mill, and is provided with four rollers, namely a supporting roller with the diameter of 320mm and a working roller with the diameter of 120 mm.
Step 2): the mounted magnesium alloy plate is automatically heated to the set temperature of 150 ℃ through current, the temperature is measured through a contact thermocouple, and the time for heating to the set temperature is about 45 s.
Step 3): when the magnesium alloy plate is heated to the set rolling temperature, single-pass rolling is immediately carried out, the pass rolling reduction is 42.4%, and the rolling speed is 0.05 m/s. The magnesium alloy plate is heated on line before rolling to ensure accurate rolling temperature.
Step 4): and after the single-pass deformation rolling is finished, unloading to obtain a magnesium alloy rolling sample.
And unloading the magnesium alloy rolling sample through single-pass deformation rolling to finally obtain the magnesium alloy plate with the thickness of 2.88 mm. The rolled plate is shown in FIG. 2.
In this embodiment, the time taken for rolling the whole magnesium alloy plate from 5mm to 2.88mm in 1 pass can be controlled to be about 1 min. And observing the macroscopic morphology of the plate after the rolling is finished, wherein the result shows that no obvious edge crack appears on the rolled surface.
Examples 5 to 6 were prepared using the same magnesium alloy sheet and rolling method as in example 4, except that the reduction amount in example 5 was 40% and the reduction amount in example 6 was 52%. The macroscopic appearances of the plates of the examples 5 and 6 were observed after the rolling was completed, and the results showed that no obvious edge cracks appeared on the rolled surface.
Second, applicable magnesium alloy sheet material
Magnesium alloy ingots are prepared by adopting the components shown in the table 1, the magnesium alloy ingots are extruded into magnesium alloy plates with the width of 105mm, and the obtained magnesium alloy plates are rolled by adopting the method.
TABLE 1 (unit:%)
| Magnesium alloy | Al | Zn | Mn | Si | Ca | Fe | Cu | Mg |
| 1 | 3.35 | 0.88 | 0.39 | Si≤0.1% | Ca≤0.04% | Fe≤0.05% | Cu≤0.05% | Balance of |
| 2 | — | 2.15 | 1.62 | Si≤0.1% | Ca≤0.04% | Fe≤0.05% | Cu≤0.05% | Balance of |
In the embodiments 1 and 4, magnesium alloy ingots are respectively prepared by using the components of the magnesium alloys 1 and 2, and are extruded, and then the magnesium alloy slabs are obtained after being rolled by using the method of the invention. The macroscopic morphology of the plate after the rolling is finished is observed, and the result shows that no obvious edge crack appears on the rolling surfaces of the examples 1 and 4.
After the research on the rolling process of the existing magnesium alloy plate, the magnesium alloy plate is usually rolled at a very high temperature, so that the general energy consumption of the rolling process of the magnesium alloy plate is higher. This is because magnesium alloy has good heat dissipation properties, and generally, temperature drop occurs during the transfer from the heating furnace to the rolls before the rolling of the magnesium alloy sheet. And the edge of the magnesium plate is in contact with air during rolling, so that heat loss is large. Therefore, when rolling magnesium alloy plates in the traditional process, the temperature drop of the plates can be reduced as much as possible by heating the magnesium ingot to a higher temperature. The invention heats the magnesium alloy plate by on-line heating and then immediately rolls the magnesium alloy plate, thereby avoiding the temperature drop of the magnesium alloy plate before rolling and ensuring that the metal flow properties of the middle part and the edge part are relatively uniform. In addition, the application of proper tension at the two ends of the plate can improve the deformation capability of the plate, increase the formability of the plate, further inhibit the occurrence of edge cracks in the rolling process, and finally obtain the magnesium alloy plate without edge cracks by rolling.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (4)
1. The method for rolling the magnesium alloy plate without edge cracking at low temperature and large pass reduction is characterized by comprising the following steps of:
step 1) mounting a magnesium alloy plate on a rolling mill; wherein the temperature of the roller is 180-210 ℃, and the tension of the left end and the right end is 2 kN;
step 2), heating the mounted magnesium alloy plate to a set rolling temperature on line, wherein the set rolling temperature is 150-170 ℃;
step 3) after the magnesium alloy plate is heated to a set rolling temperature, performing single-pass rolling, wherein the pass rolling reduction is 40-53%, and the rolling speed is 0.05-0.1 m/s;
and 4) unloading to obtain a magnesium alloy rolled sample without edge cracks after single-pass deformation rolling is finished.
2. The method for rolling the magnesium alloy plate without the edge crack through the low-temperature large-pass reduction according to claim 1, wherein the rolling mill is a high-rigidity hydraulic tension four-roller warm-rolling reversible experiment rolling mill.
3. The method for rolling the magnesium alloy plate without the edge crack through the low-temperature large-pass reduction according to claim 1, wherein the online heating means heats the magnesium alloy rolled plate through current, and chucks are arranged at two ends of the plate to ensure the shape of the rolled plate.
4. The method for rolling the magnesium alloy plate without the edge crack by the low-temperature large-pass reduction according to claim 1, wherein the temperature is measured by a contact thermocouple in the step 2).
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| CN202111163955.5A CN113770175B (en) | 2021-09-30 | 2021-09-30 | Method for rolling edge-crack-free magnesium alloy sheet through low-temperature large-pass reduction |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101716593A (en) * | 2009-12-04 | 2010-06-02 | 湖南大学 | Magnesium alloy sheet rolling method |
| CN103388116A (en) * | 2013-08-09 | 2013-11-13 | 重庆大学 | Method for effectively rolling Mg-Al-Zn magnesium alloys |
| CN103962376A (en) * | 2014-03-29 | 2014-08-06 | 吉林大学 | Large reduction rolling method for magnesium alloy |
| CN104259201A (en) * | 2014-07-24 | 2015-01-07 | 重庆大学 | Method for rolling high-ductility and high-scalability Mg-Al series magnesium alloy plates |
| CN104607466A (en) * | 2015-01-14 | 2015-05-13 | 大连理工大学 | Hot rolling machining method for high indoor temperature plastic magnesium alloy plate |
| CN106734205A (en) * | 2017-02-07 | 2017-05-31 | 吉林大学 | A kind of method that short route rolling prepares superplasticity magnesium alloy |
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| WO2017111550A1 (en) * | 2015-12-23 | 2017-06-29 | 주식회사 포스코 | Magnesium alloy sheet material and manufacturing method therefor |
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| CN112853185A (en) * | 2021-01-08 | 2021-05-28 | 吉林大学 | Low-temperature superplastic magnesium alloy with low alloy content and preparation method thereof |
-
2021
- 2021-09-30 CN CN202111163955.5A patent/CN113770175B/en active Active
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| CN101716593A (en) * | 2009-12-04 | 2010-06-02 | 湖南大学 | Magnesium alloy sheet rolling method |
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| CN111330986A (en) * | 2020-04-07 | 2020-06-26 | 宿迁市河海大学研究院 | Efficient integrated processing method for preparing high-strength high-toughness magnesium alloy sheet with controllable double-peak structure |
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