CN109332389B - Method for cross rolling of magnesium alloy - Google Patents
Method for cross rolling of magnesium alloy Download PDFInfo
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- CN109332389B CN109332389B CN201811086600.9A CN201811086600A CN109332389B CN 109332389 B CN109332389 B CN 109332389B CN 201811086600 A CN201811086600 A CN 201811086600A CN 109332389 B CN109332389 B CN 109332389B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 81
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000009467 reduction Effects 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 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
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
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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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Metal Rolling (AREA)
Abstract
A method for cross-rolling magnesium alloy features that the magnesium alloy plate blank is rolled by rolling mill with S-shaped upper and lower working rollers in same shape and structure, the rolling roller has a straight end, the length of rolled piece is less than 10% in the first two passes, the length of rolled piece is less than 20% in the third pass, the magnesium plate is rolled transversely by rotating it by 90 deg. in the fourth pass, the upper and lower working rollers are moved leftwards and rightwards symmetrically in the fifth pass, and the rolling rate is less than 15%, and the sixth and seventh passes are rolled by moving them leftwards and rightwards symmetrically and rolling them with straight segment of working roller, the sixth pass rolling rate is less than 10% and the seventh pass rolling rate is less than 1%.
Description
Technical Field
The invention belongs to the technical field of rolled magnesium alloy plates, and particularly relates to a magnesium alloy cross rolling method.
Background
The magnesium alloy is a metal material widely applied in engineering at present, the main processing mode is rolling at present, the rolling edge crack damage is a key factor influencing the production of magnesium alloy plates, no complete theory is provided at present to explain the mechanism and the elimination method of the edge crack damage, and only the continuous optimization processing method can be adopted to reduce the edge crack degree of rolled pieces. The traditional processing method has the defects that the pressing system and the rolling speed distribution in the processing technology are unreasonable, the crystal grains cannot be effectively refined, the edge crack degree in the processing process is serious, the product percent of pass is low, and the raw material loss is serious.
The rolling mill roll system has great influence on the rolling of the magnesium alloy plate strip. At the present stage, a plurality of roll types are designed for rolling magnesium alloy plates, and the rolling reduction and the rolling force of the edge of the plate cannot be well controlled, so that the thickness variation of the edge of a rolled piece is inconsistent with the thickness variation of the middle of the rolled piece, the edge crack degree of the rolled plate is serious, and the plate shape and the quality of a finished product cannot be ensured.
Disclosure of Invention
The invention aims to provide a method for cross rolling of magnesium alloy, which can effectively overcome the defects in the prior art.
The invention is realized in such a way that as shown in figure 1, the upper working roll and the lower working roll have the same shape and structure, one end of the left end and the right end of the roll body is S-shaped, the other end is straight, and the upper working roll and the lower working roll are arranged in a rolling mill frame in opposite directions; as shown in fig. 2, the upper and lower work rolls are structured as follows: lpIs the length of the straight section of the roll body, /)sIs the length of the S-shaped curve section of the roll body; r2Radius of arc tangent to straight section for S-shaped curve, R1Is an "S" shaped curve and R2The arc radius tangent to and connected with the roll neck; r1＝R2The connecting points are tangent; delta D is the radial height of the S-shaped curve, 0.2-0.5 mm is equal to Delta D, lp:ls＝4:1，R1＝R2＝(ΔD2+ls 2)/(4ΔD)。
The method is characterized in that: the rolling method comprises the following steps:
(1) inputting the magnesium alloy plate blank with the thickness of 5-15 mm and the width of 500-2000 mm into a rolling mill along the length direction for rolling for three passes: the reduction rate of the first two passes is less than 10%, the deformation strength of a rolled piece is 80-90 MPa, and the rolling speed is 0.2-0.5 m/s; the reduction rate of the third pass is less than 20%, the deformation strength of the rolled piece is 120-130 MPa, and the rolling speed is 0.6-0.8 m/s. The length of the rolled piece reaches the length required by a finished product;
(2) the fourth pass is that the magnesium alloy plate blank is rotated by 90 degrees by a steel rotating machine for transverse rolling, namely edge convexity rolling, and the upper working roll and the lower working roll are symmetrically moved rightwards for rolling, as shown in figure 4; the reduction rate is 15% -25%, the deformation strength of a rolled piece is 170-180 MPa, the rolling speed is 0.3-0.5 m/s, and the shape of the rolled plate is that the cross section is convex at two sides and is in antisymmetric distribution, as shown in figure 3;
(3) and a fifth step: moving an upper working roll to the right and a lower working roll symmetrically to the left, performing roll shifting rolling until thick areas on two sides of a rolled piece are pressed down, flattening the rolled piece, wherein the pressing rate is less than 15%, the deformation strength of the rolled piece is selected to be 110-120 MPa, and the rolling speed is controlled to be 0.3-0.5 m/s;
(4) sixth rolling and seventh rolling: moving the upper working roll to the right and the lower working roll to the left symmetrically, and rolling by utilizing the straight section of the working roll: the reduction rate of the sixth pass is less than 10%, the deformation strength of the rolled piece is 70-80 MPa, and the rolling speed is 0.6-0.8 m/s; and controlling the reduction rate to be less than 1% in the seventh pass, selecting the deformation strength of the rolled piece to be 40-50 MPa, and controlling the rolling speed to be 1.0-1.3 m/s to realize final rolling.
The invention has the advantages and positive effects that:
①, the rolling reduction and the rolling force of the edge of the rolled piece are effectively ensured, the edge of the rolled piece and the middle part have different rolling reduction rates, the grain size of the rolled piece is refined, and the mechanical property is improved;
② overcomes the problems of edge crack and poor plate shape;
③ increase the yield of rolled stock.
Description of the drawings:
FIG. 1 is a schematic view of a roll system of a rolling mill;
FIG. 2 is a schematic view of the upper and lower work rolls;
FIG. 3 is a cross-sectional view of the rolled stock after a fourth pass;
FIG. 4 is a schematic view of the upper work roll moving to the left and lower work rolls to the right;
FIG. 5 is a schematic view showing the upper work roll moving to the right and the lower work roll moving to the left.
In the figure, 1' -upper and lower supporting rollers; 2. 2' — upper and lower work rolls; 3-rolled piece; lp-the length of the work roll straight section; ls-the length of the S-shaped curve segment of the work roll; r1、R2-radius of the arc of the S-shaped curve; Δ D-sigmoidal radial height; i, a left thick area of a rolled piece; II, a rolled piece thin area; III-rolling piece right thickness area.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings and specific examples.
In the present embodiment, a four-high rolling mill is used, and a cross variable thickness rolling method is used to perform plate forming processing on a material by axial movement of work rolls.
Example (b):
selecting a rolled magnesium alloy of AZ31B type, and the specification of a blank: 8 × 850 × 1000mm, finished product specification: (2-4) × (1930-1420) mm, rolling speed: (0.2-2.0) m/s, and the working roll size of the four-roll mill is phi 1000 multiplied by 2500 mm.
The working roll structure is:
(1) length l of the straight section of the working rollpLength l of S-shaped curve segment of working rollsThe ratio of the two is 4:1, take onep＝2000mm，ls500mm, the radial height of S-shaped curve segment is 0.5 mm;
(2) the radius of the arc of the S-shaped curve in the working roll is
The rolling method comprises the following process steps:
(1) rolling the magnesium alloy plate blank along the length direction for three times, and controlling the reduction rate epsilon of the rolled piece of the 1 st time18.75 percent, the deformation strength of a rolled piece is 80MPa, and the rolling speed v10.3 m/s; reduction rate epsilon of rolled piece in 2 nd pass29.58 percent, the deformation strength of the rolled piece is 80MPa, and the rolling force is selected as the rolling speed v20.5 m/s; controlling the reduction rate epsilon of the 3 rd pass319.70 percent, the deformation strength of a rolled piece is 125MPa, and the rolling speed is 0.8 m/s; spreading and lengthening the rolled piece along the length direction, and rolling the rolled piece into a strip finished product with the required length l being (1930-1420) mm;
(2) in the 4 th pass, the magnesium plate is rotated by 90 degrees through a steel turning machine to roll the edge of the magnesium plate in a transverse rolling way, the upper working roll and the lower working roll move rightwards symmetrically, as shown in figure 4, the rolled plate is rolled into a shape with a cross section which is convex at two sides and is distributed in an antisymmetric way, as shown in figure 3; the reduction rate of the pass is controlled to be epsilon420.8 percent, the deformation strength of the rolled piece is 175MPa, and the rolling speed is 0.3 m/s;
(3) the 5 th pass of roll shifting rolling, wherein the upper working roll moves to the right and the lower working roll symmetrically to the left, as shown in fig. 5, the thick areas on the two sides of the rolled piece are pressed down, and the rolled piece is rolled flat; controlling the reduction rate epsilon of the current pass5The deformation strength of the rolled piece is selected to be 110MPa, and the rolling speed is controlled to be 0.5 m/s;
(4) and the 6 th and 7 th pass: continuously moving the upper working roll to the right and the lower working roll to the left symmetrically, and rolling by utilizing the straight section of the working roll until the target thickness is reached; in the 6 th pass, the reduction rate ε of the pass is controlled65.41 percent, the deformation strength of the rolled piece is 75MPa, and the rolling speed is 0.8 m/s; the 7 th pass, i.e. the last pass, and the reduction rate epsilon of the pass is controlled7And (3) selecting the deformation strength of the rolled piece to be 0.28%, controlling the rolling speed to be 1.2m/s, forming a finished plate and finishing rolling.
The magnesium alloy plate rolled by the embodiment has the advantages of uniform structure, high yield and good mechanical property, and meets the requirements of actual production.
Claims (1)
1. A magnesium alloy cross rolling method, the shape of the upper, lower working roll of the cross rolling of magnesium alloy, structure are the same, one end is "S" shape in the left, right end of the roll body, another end is straight, the upper, lower working roll is installed in the rolling mill frame in the opposite direction; the upper and lower working rolls have the following structure: lpIs the length of the straight section of the roll body, /)sIs the length of the S-shaped curve section of the roll body; r2Radius of arc tangent to straight section for S-shaped curve, R1Is an "S" shaped curve and R2The arc radius tangent to and connected with the roll neck; r1＝R2The connecting points are tangent; delta D is the radial height of the S-shaped curve, 0.2-0.5 mm is equal to Delta D, lp:ls＝4:1，R1＝R2＝(ΔD2+ls 2) (4 Δ D), characterized in that the rolling method is: (1) inputting the magnesium alloy plate blank with the thickness of 5-15 mm and the width of 500-2000 mm into a rolling mill along the length direction for rolling for three passes: front sideThe reduction ratio of two passes is<10%, the deformation strength of the rolled piece is 80-90 MPa, and the rolling speed is 0.2-0.5 m/s; reduction ratio of the third pass<20%, the deformation strength of the rolled piece is 120-130 MPa, the rolling speed is 0.6-0.8 m/s, and the length of the rolled piece reaches the length required by a finished product; (2) the fourth pass is to rotate the magnesium alloy plate blank by 90 degrees through a steel turning machine to carry out transverse rolling, namely edge convexity rolling, and to roll the upper working roll and the lower working roll symmetrically rightwards, wherein the rolling reduction is 15-25 percent, the deformation strength of a rolled piece is 170-180 MPa, the rolling speed is 0.3-0.5 m/s, and the shape of the rolled plate is that the cross section is convex at two sides and is in an anti-symmetric distribution shape; (3) and a fifth step: moving the upper working roll to the right and the lower working roll symmetrically to the left, performing roll shifting rolling until thick areas on two sides of a rolled piece are pressed down, flattening the rolled piece, wherein the pressing rate is<15%, the deformation strength of the rolled piece is selected to be 110-120 MPa, and the rolling speed is controlled to be 0.3-0.5 m/s; (4) sixth rolling and seventh rolling: moving the upper working roll to the right and the lower working roll to the left symmetrically, rolling by using the straight section of the working roll, and rolling reduction of the sixth pass<10 percent, the deformation strength of the rolled piece is 70-80 MPa, and the rolling speed is 0.6-0.8 m/s; controlling the reduction rate in the seventh pass<1%, the deformation strength of the rolled piece is 40-50 MPa, and the rolling speed is 1.0-1.3 m/s, so that the final rolling is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811086600.9A CN109332389B (en) | 2018-09-18 | 2018-09-18 | Method for cross rolling of magnesium alloy |
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| CN201811086600.9A CN109332389B (en) | 2018-09-18 | 2018-09-18 | Method for cross rolling of magnesium alloy |
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| CN110216145B (en) * | 2019-07-10 | 2020-12-15 | 太原科技大学 | Magnesium alloy plate fine-grain chemical edge cracking rolling method |
| CN110216146B (en) * | 2019-07-13 | 2020-12-15 | 太原科技大学 | Low-cost magnesium alloy plate edge crack control rolling method |
| CN111389916A (en) * | 2020-03-26 | 2020-07-10 | 太原科技大学 | Gradient tissue regulation and control method based on cross variable thickness rolling |
| CN117483424B (en) * | 2023-11-17 | 2024-06-04 | 燕山大学 | Axially movable special-shaped roller for improving edge crack of magnesium alloy plate and rolling method |
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| JPH06114414A (en) * | 1992-10-03 | 1994-04-26 | Sumitomo Metal Ind Ltd | Projecting hot forming roller for finishing rolled channel bar and finishing method |
| JP3348503B2 (en) * | 1994-02-25 | 2002-11-20 | 石川島播磨重工業株式会社 | Work rolls and roll shift mills for rolling mills |
| CN100413608C (en) * | 2005-03-28 | 2008-08-27 | 宝山钢铁股份有限公司 | Support roller matched with working roller curve of continuous variable convex rolling mill |
| CN101045240A (en) * | 2006-03-29 | 2007-10-03 | 宝山钢铁股份有限公司 | Higher degree roller ablet to control edge shape of steel band |
| JP2009113090A (en) * | 2007-11-08 | 2009-05-28 | Mitsubishi Alum Co Ltd | Method for producing magnesium alloy sheet |
| CN101569892A (en) * | 2009-05-21 | 2009-11-04 | 上海交通大学 | Method for rolling AZ31 magnesium alloy through asynchronous longitudinal and transverse crossing |
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