CN111389916A - Gradient tissue regulation and control method based on cross variable thickness rolling - Google Patents
Gradient tissue regulation and control method based on cross variable thickness rolling Download PDFInfo
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- CN111389916A CN111389916A CN202010221117.8A CN202010221117A CN111389916A CN 111389916 A CN111389916 A CN 111389916A CN 202010221117 A CN202010221117 A CN 202010221117A CN 111389916 A CN111389916 A CN 111389916A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 230000001276 controlling effect Effects 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 abstract 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 10
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010008 shearing 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
- 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
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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
- B21B37/58—Roll-force control; Roll-gap control
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Abstract
The invention belongs to the technical field of gradient tissue regulation and control methods, and particularly relates to a gradient tissue regulation and control method based on cross variable thickness rolling, which comprises the following steps: heating a metal plate blank in a heating furnace to a preset temperature, preserving heat for 10-20 min, and inputting the metal plate blank into a rolling mill for carrying out first-time conventional flat rolling; returning the metal plate blank to the furnace for heat preservation, rotating the metal plate blank clockwise by 90 degrees for second-pass variable-thickness rolling, adjusting the rolling reduction through an AGC control system, enabling the roller to move up and down at a certain speed within a specific time, and rolling the metal plate blank into a shape with a thin middle and thick two sides; rotating the rolled metal plate blank by 90 degrees anticlockwise, and performing a third common flat rolling to finish the final rolling; and respectively sampling the metal plate blank after finishing rolling from the middle part and the edge part along the rolling direction, and analyzing the grain size distribution in the metallographic structure of the sample by using a scanning electron microscope. The invention overcomes the problems of edge crack and poor plate shape of the plate and improves the yield of rolled pieces. The invention is used for regulating and controlling the rolling gradient structure.
Description
Technical Field
The invention belongs to the technical field of gradient tissue regulation and control methods, and particularly relates to a gradient tissue regulation and control method based on cross variable thickness rolling.
Background
Magnesium alloy is the lightest applied metal material in the industry at present, has a series of characteristics of small density, high specific strength, good dimensional stability, good magnetic shielding property, excellent weldability and the like, and is becoming the most promising alloy material in the modern high and new technology field. The rolling is one of the most main shaping processing methods of the magnesium alloy plate, and the quality of the technology is directly related to the application prospect of the magnesium alloy plate.
The grain size has a great influence on the slip mechanism of magnesium alloys. Because the magnesium alloy has a close-packed Hexagonal (HCP) crystal structure, a slippage system is less at room temperature, deformation is mainly based on basal plane slippage, and the plastic deformation capability is poor, so that the defects of cracks, curls and the like are easy to appear in the rolling process, the rolling yield is low, and a large amount of qualified magnesium alloy plates are difficult to produce.
The edge grains of the rolled plate are refined, so that a certain tissue gradient is formed from the edge to the central area of the rolled plate, and the quality of the plate blank can be effectively improved. For the traditional rolling method, during the deformation of the plate blank, a large shearing strain exists between the roller and the magnesium alloy, so that a strong basal plane texture can be generated in a rolled plate, a conical surface sliding system is difficult to activate, the grain size of the edge of the plate blank cannot be effectively refined, different grain size distributions are difficult to present from the middle part to the edge of the plate blank, the tissue gradient regulation and control of the plate blank are difficult to realize, and the mechanical property of a rolled piece is improved. Therefore, the evolution law based on the grain refinement mechanism of the magnesium alloy is researched to become the difficulty and hot spot of magnesium alloy rolling.
Disclosure of Invention
Aiming at the technical problems that the slab crystal grains cannot be refined and the edge crack is damaged, the invention provides the gradient structure regulating and controlling method based on the cross variable thickness rolling, which has the advantages of high yield, small error and small damage to the slab.
In order to solve the technical problems, the invention adopts the technical scheme that:
a gradient tissue regulation and control method based on cross variable thickness rolling comprises the following steps:
s1, heating the metal plate blank in a heating furnace to a preset temperature, preserving heat for 10-20 min, and then inputting the metal plate blank into a rolling mill for first-pass conventional flat rolling;
s2, after the metal plate blank is returned to the furnace and is kept warm for 15min, clockwise rotating for 90 degrees to perform second-pass variable-thickness rolling, adjusting the rolling reduction through an AGC control system to enable the roller to move up and down, and rolling the metal plate blank into a shape with a thin middle and thick two sides;
s3, rotating the rolled metal plate blank anticlockwise by 90 degrees to perform single-pass or multi-pass common flat rolling, wherein the reduction rate of each pass is 20-30%, and finishing the final rolling;
and S4, respectively sampling the metal plate blank after finish rolling from the middle part and the edge part along the rolling direction, and analyzing the grain size distribution in the metallographic structure of the sample by using a scanning electron microscope.
The reduction rate of the first pass in the S1 is less than or equal to 10 percent.
The reduction rate of the second pass in the S2 is 25-30%.
And in the S1, the thickness of the metal plate blank is 5-20 mm.
The preset temperature in S1 is not higher than the recrystallization temperature of the metal slab.
The maximum convexity of the thin middle and thick two sides shape in S2 is 0.5-3.0 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention overcomes the problems of edge crack and poor plate shape of the plate and improves the yield of rolled pieces; the invention effectively ensures the rolling reduction and the rolling force of the edge of the rolled piece, ensures that the edge of the rolled piece and the middle part have different rolling reduction rates, refines the grain size of the edge of the rolled piece, reduces the texture strength of the substrate, obviously improves the formability of the plate, weakens the texture of the substrate, and ensures that the plate blank shows better plasticity; the invention ensures that different grain size distributions are shown from the middle part to the edge part of the plate blank, effectively realizes the tissue gradient regulation and control of the plate blank and improves the mechanical property of rolled pieces.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
FIG. 2 is a metallographic scanning electron microscope image of the edge of the slab of the present invention;
FIG. 3 is a metallographic scanning electron microscope image of the edge of the slab of the present invention.
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.
A gradient structure regulating method based on cross variable thickness rolling is shown in figure 1 and comprises the following steps:
s1, heating the metal plate blank in a heating furnace to a preset temperature, preserving heat for 10-20 min, and inputting the metal plate blank into a rolling mill for first-pass conventional flat rolling;
s2, after the metal plate blank is returned to the furnace and is kept warm for 15min, clockwise rotating for 90 degrees to perform second-pass variable-thickness rolling, adjusting the rolling reduction through an AGC control system to enable the roller to move up and down, and rolling the metal plate blank into a shape with a thin middle and thick two sides;
s3, rotating the rolled metal plate blank anticlockwise by 90 degrees to perform single-pass or multi-pass common flat rolling, wherein the reduction rate of each pass is 20-30%, and finishing the final rolling;
and S4, respectively sampling the metal plate blank after finish rolling from the middle part and the edge part along the rolling direction, and analyzing the grain size distribution in the metallographic structure of the sample by using a scanning electron microscope.
Further, the reduction ratio of the first pass in S1 is less than or equal to 10%.
Further, the reduction ratio in the second pass in S2 is 25% to 30%.
Further, the thickness of the metal slab in S1 is 5-20 mm.
Further, the preset temperature in S1 is not higher than the recrystallization temperature of the metal slab.
Further, the maximum convexity of the thin middle and thick sides in S2 is 0.5-3.0 mm.
Examples
Selecting a rolled magnesium alloy of AZ31B type, wherein the specification of a blank is 150 × 150 × 15mm, the rolling speed is 0.1m/s, and the size of a working roll of a two-roll mill is phi 320 × 360 mm.
The rolling method comprises the following process steps:
step one, heating a metal plate blank in a heating furnace to 250 ℃, preserving heat for 15min, inputting the plate blank into a rolling mill for carrying out first-pass conventional flat rolling, and reducing ratio of pass110%, the thickness of the slab after rolling is h1＝13.5mm；
Step two, after the slab is returned to the furnace and is kept warm for 15min, clockwise rotating for 90 degrees to perform second pass variable thickness rolling, adjusting the rolling reduction through an AGC control system to enable the rolling reduction to move up and down at a certain speed within a specific time, and rolling the slab into a shape with a thin middle and thick two sides; the pass reduction rate is225%, the intermediate thickness of the slab after rolling is h210.125mm, the maximum thickness of the edge is h21＝12.125mm；
Step three, rotating the rolled plate blank by 90 degrees anticlockwise to carry out the last common flat rolling, wherein the pass reduction rate is330%, and the thickness of the plate blank after rolling is h3Finishing finish rolling when the thickness is 7.088 mm;
and step four, respectively sampling the plate blank after finishing rolling from the middle part and the edge part along the rolling direction, and analyzing the grain size distribution in the metallographic structure of the sample by using a scanning electron microscope.
The metallographic structure distribution of the plate in different areas after sampling and analysis is shown in fig. 2 and 3, and it can be seen from the figure that the grain size of the edge part of the plate is obviously smaller than that of the middle area, so that the tissue gradient regulation and control of the plate are realized.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (6)
1. A gradient structure regulation and control method based on cross variable thickness rolling is characterized in that: comprises the following steps:
s1, heating the metal plate blank to a preset temperature in a heating furnace, preserving heat for 10-20 min, and then inputting the metal plate blank into a rolling mill for first-pass conventional flat rolling;
s2, after the metal plate blank is returned to the furnace and is kept warm for 15min, clockwise rotating for 90 degrees to perform second-pass variable-thickness rolling, adjusting the rolling reduction through an AGC control system to enable the roller to move up and down, and rolling the metal plate blank into a shape with a thin middle and thick two sides;
s3, rotating the rolled metal plate blank anticlockwise by 90 degrees to perform single-pass or multi-pass common flat rolling, wherein the reduction rate of each pass is 20-30%, and finishing the final rolling;
and S4, respectively sampling the metal plate blank after finish rolling from the middle part and the edge part along the rolling direction, and analyzing the grain size distribution in the metallographic structure of the sample by using a scanning electron microscope.
2. The gradient structure regulating and controlling method based on cross variable thickness rolling according to claim 1, characterized in that: the reduction rate of the first pass in the S1 is less than or equal to 10 percent.
3. The gradient structure regulating and controlling method based on cross variable thickness rolling according to claim 1, characterized in that: the reduction rate of the second pass in the S2 is 25-30%.
4. The gradient structure regulating and controlling method based on cross variable thickness rolling according to claim 1, characterized in that: and in the S1, the thickness of the metal plate blank is 5-20 mm.
5. The gradient structure regulating and controlling method based on cross variable thickness rolling according to claim 1, characterized in that: the preset temperature in S1 is not higher than the recrystallization temperature of the metal slab.
6. The gradient structure regulating and controlling method based on cross variable thickness rolling according to claim 1, characterized in that: the maximum convexity of the thin middle and thick two sides shape in S2 is 0.5-3.0 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010221117.8A CN111389916A (en) | 2020-03-26 | 2020-03-26 | Gradient tissue regulation and control method based on cross variable thickness rolling |
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| CN202010221117.8A CN111389916A (en) | 2020-03-26 | 2020-03-26 | Gradient tissue regulation and control method based on cross variable thickness rolling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941602A (en) * | 2021-09-29 | 2022-01-18 | 西安交通大学 | Gradient-structure metal material with adjustable gradient rate and preparation method thereof |
| CN113953315A (en) * | 2021-09-29 | 2022-01-21 | 西安交通大学 | Layered multilevel heterostructure metal material with adjustable period and preparation method thereof |
| CN114807580A (en) * | 2022-05-30 | 2022-07-29 | 苏州东宝海星金属材料科技有限公司 | Cover type annealing process for variable-thickness cold-rolled sheet |
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|---|---|---|---|---|
| JPS5829509A (en) * | 1981-08-12 | 1983-02-21 | Kobe Steel Ltd | Controlling method for plane shape of thick plate |
| JPH11226620A (en) * | 1998-02-09 | 1999-08-24 | Nkk Corp | Method for controlling shape of steel plate |
| CN102974624A (en) * | 2012-12-06 | 2013-03-20 | 秦皇岛首秦金属材料有限公司 | Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel |
| CN103480648A (en) * | 2013-09-18 | 2014-01-01 | 济钢集团有限公司 | Novel PVPC (plan view pattern control) rolling process for surface plates |
| CN105170660A (en) * | 2015-09-02 | 2015-12-23 | 太原科技大学 | Edge-controlling rolling method for wide magnesium alloy plate |
| CN109332389A (en) * | 2018-09-18 | 2019-02-15 | 太原科技大学 | A kind of roll and its milling method of magnesium alloy tandem rolling |
| CN110216146A (en) * | 2019-07-13 | 2019-09-10 | 太原科技大学 | Milling method is split on a kind of low-cost magnesium alloy plate control side |
| CN110216145A (en) * | 2019-07-10 | 2019-09-10 | 太原科技大学 | Milling method is split on a kind of magnesium alloy plate grain refining control side |
| CN110560483A (en) * | 2019-09-03 | 2019-12-13 | 太原科技大学 | Edge-convexity edge-control rolling method for edge of magnesium alloy slab prefabricated by special-shaped roller |
-
2020
- 2020-03-26 CN CN202010221117.8A patent/CN111389916A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5829509A (en) * | 1981-08-12 | 1983-02-21 | Kobe Steel Ltd | Controlling method for plane shape of thick plate |
| JPH11226620A (en) * | 1998-02-09 | 1999-08-24 | Nkk Corp | Method for controlling shape of steel plate |
| CN102974624A (en) * | 2012-12-06 | 2013-03-20 | 秦皇岛首秦金属材料有限公司 | Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel |
| CN103480648A (en) * | 2013-09-18 | 2014-01-01 | 济钢集团有限公司 | Novel PVPC (plan view pattern control) rolling process for surface plates |
| CN105170660A (en) * | 2015-09-02 | 2015-12-23 | 太原科技大学 | Edge-controlling rolling method for wide magnesium alloy plate |
| CN109332389A (en) * | 2018-09-18 | 2019-02-15 | 太原科技大学 | A kind of roll and its milling method of magnesium alloy tandem rolling |
| CN110216145A (en) * | 2019-07-10 | 2019-09-10 | 太原科技大学 | Milling method is split on a kind of magnesium alloy plate grain refining control side |
| CN110216146A (en) * | 2019-07-13 | 2019-09-10 | 太原科技大学 | Milling method is split on a kind of low-cost magnesium alloy plate control side |
| CN110560483A (en) * | 2019-09-03 | 2019-12-13 | 太原科技大学 | Edge-convexity edge-control rolling method for edge of magnesium alloy slab prefabricated by special-shaped roller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941602A (en) * | 2021-09-29 | 2022-01-18 | 西安交通大学 | Gradient-structure metal material with adjustable gradient rate and preparation method thereof |
| CN113953315A (en) * | 2021-09-29 | 2022-01-21 | 西安交通大学 | Layered multilevel heterostructure metal material with adjustable period and preparation method thereof |
| CN114807580A (en) * | 2022-05-30 | 2022-07-29 | 苏州东宝海星金属材料科技有限公司 | Cover type annealing process for variable-thickness cold-rolled sheet |
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Application publication date: 20200710 |