CN112718861B - Light alloy rolling composite forming process method capable of controlling edge crack - Google Patents
Light alloy rolling composite forming process method capable of controlling edge crack Download PDFInfo
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- CN112718861B CN112718861B CN202011469369.9A CN202011469369A CN112718861B CN 112718861 B CN112718861 B CN 112718861B CN 202011469369 A CN202011469369 A CN 202011469369A CN 112718861 B CN112718861 B CN 112718861B
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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
- B21B1/38—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
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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
- B21B1/38—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
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Abstract
The invention discloses a light alloy rolling composite forming process method capable of controlling edge crack, which belongs to the technical field of light alloy plate composite forming processes. The groove can effectively control the generation of edge cracks in the rolling process; the bulges are matched with the rollers, so that the alloy plate is subjected to local severe shearing deformation in the rolling process, the transverse widening of the plate is promoted, and the effect of weakening the texture is achieved. The whole lining plate is the same as the lining plate in the process of composite forming, so that the single-pass reduction can be increased, the rolling passes can be reduced, the rolling temperature can be reduced, and the grain size can be refined more effectively. The whole deformation process can be regarded as the composite superposition of liner plate rolling, shearing and widening deformation on the premise of controllable edge cracking. The whole process flow is simple and convenient, is easy to realize, and has good industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of composite forming processes of light alloy plates, particularly relates to a controllable edge crack rolling-shearing-widening composite forming process of a high-performance light alloy plate, and belongs to the technical field of metal composite forming processing.
Background
With the increasing demand of energy conservation and emission reduction in China, the light weight becomes an irreversible trend in the field of applied metal. And the alloy is expected to be widely applied to the fields of automobiles, electrical appliances, aerospace and the like as a light alloy material with relatively low density. The light alloys commonly used at present are mainly magnesium alloy, aluminum alloy and titanium alloy. The magnesium and the magnesium alloy are the lightest metal structure materials in the current engineering application, and have high specific strength and specific rigidity, good electric and thermal conductivity and excellent electromagnetic shielding performance; the aluminum and the aluminum alloy have high oxidation resistance, corrosion resistance and impact resistance; the titanium alloy has the advantages of high strength, good corrosion resistance, good thermal stability and the like. Rolling is one of the most important and most common processing modes of light alloy plates, particularly light alloy sheets, but the traditional rolling method can generate strong basal plane textures due to the deformation characteristic of complete symmetry from top to bottom, so that severe anisotropy is generated, the subsequent processing of the plates is severely limited, and the mechanical property is greatly reduced. In addition, in the rolling process, the deformation mainly deforms along the rolling direction, the transverse widening is very limited, and particularly when a thin plate is rolled, the transverse widening can directly promote the generation of edge cracks, the yield of the rolled plate is seriously reduced, and the waste of the plate is greatly increased.
The invention discloses a conical roller for weakening edge cracking of a magnesium alloy plate and a rolling method thereof, wherein the conical roller mainly comprises a baffle, a conical sleeve, a roller main body and the like, is used for rolling once, the edge convexity of a prefabricated plate blank is preformed, the middle pass is formed by alternately rolling a common flat roller and a conical roller, and the last pass is formed by rolling the plate blank to a thin plate by using the common flat roller. However, the method has the disadvantages of high roller manufacturing cost, unsuitability for industrial application, and complicated process flow, and is not in accordance with the development trend of processing high-performance light alloy plates by short process at present.
The invention patent CN103962376A discloses a rolling method for magnesium alloy under large rolling reduction, on the basis of the traditional magnesium alloy rolling technology, by adding a hard alloy lining plate with multi-arc wave shape or spherical crown multi-point shape and convex upward in the rolling process, the symmetrical stress state in the magnesium alloy deformation process is changed, and the shear strain in the magnesium alloy deformation process is reduced, thereby weakening the texture, refining the crystal grains and improving the magnesium alloy performance. However, the lining plate designed by the method is too complex, needs to be separately processed by a factory, and the surface of the rolled plate is uneven, so that certain difficulties are brought to subsequent laboratory sampling and industrial application. Moreover, the method is not suitable for sheet forming. The liner plate designed by the patent can be manufactured by a simple welding process, and the process is simple and easy to realize; the rolled plate is straight, and is easy to obtain materials in a laboratory and realize industrial application.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a rolling-shearing-widening composite forming process for controllable edge cracking of light alloy, which reduces the process cost and shortens the process flow on the basis of preparing a high-performance light alloy plate and is an ideal alloy plastic processing mode with low cost, short flow and high performance.
The technical scheme adopted by the invention is as follows: on the basis of the traditional rolling method, a hard alloy lining plate which is provided with a groove and a wedge-shaped bulge simultaneously is added on the lower surface of a plate in the rolling process, so that the symmetrical stress state in the alloy deformation process is changed; the wedge-shaped bulge plays a role in increasing local shearing deformation and promoting transverse widening; the groove can effectively limit transverse over-broadening, and plays a role in limiting the generation of edge cracks.
The hard alloy lining plate provided by the invention is rectangular, a rectangular groove is formed in the center of the upper surface of the lining plate, a wedge-shaped bulge is arranged in the middle of the groove, and the wedge-shaped bulge is arranged along the rolling direction;
the forming method comprises the following steps:
(1) uniformly coating a high-temperature lubricant on the surfaces of the hard alloy lining plate and the light alloy plate, and fixing the light alloy plate on the groove of the lining plate;
(2) putting the light alloy and the alloy lining plate into a heating box, heating to the temperature of 100 ℃ and 450 ℃, standing and preserving heat for 5-30 minutes;
(3) simultaneously feeding the hard alloy lining plate and the light alloy plate between rollers, and synchronously rolling the hard alloy lining plate and the light alloy plate together;
(4) the process can carry out single-pass or multi-pass rolling, and in the multi-pass rolling process, heating and heat preservation standing are carried out among passes, and the parameters are the same as those in the step (2);
the step (2) can be omitted in the process of rolling the aluminum alloy by the process, and the lining plate and the alloy plate are directly fed between the rollers to be cold-rolled simultaneously.
The hardness of the hard alloy lining plate is lower than that of the surface of the roller, the length of the hard alloy lining plate is 40-300 mm, the width of the hard alloy lining plate is 15-150 mm, and the height of the hard alloy lining plate is 1-30 mm.
Preferably, the groove size of the cemented carbide lining plate is longer than that of the light alloy plate in the rolling direction, the transverse width of the cemented carbide lining plate is equal to the width of the light alloy plate and the width of the central bulge of the lining plate, the height of the groove of the cemented carbide lining plate is 0.5-5 mm, and the length and the width of the groove are 30-280 mm and 10-100 mm.
The height of the wedge-shaped bulge on the hard alloy lining plate is the same as that of the length groove, the height is 0.5-5 mm and 30-280 mm, and the width of the wedge-shaped bulge is 0.5-5 mm.
In the process of synchronously rolling the hard alloy lining plate and the light alloy lining plate, the single-pass reduction is 1-85%.
Preferably, the size of the roll gap in the last rolling process is the same as the height of the hard alloy lining plate.
Preferably, the light alloy sheet material is mainly a metal sheet material which is easily subjected to shear deformation, such as magnesium and magnesium alloy, aluminum and aluminum alloy, titanium and titanium alloy, and the like.
Preferably, the height of the light alloy plate is 3-50 mm higher than that of the groove of the cemented carbide lining plate.
After the final composite forming, the plate is formed into two plates by shearing-rolling composite forming from one plate, the width of the two plates is approximately equal to the width of the initial plate, and the length in the rolling direction is obviously increased.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides a light alloy composite forming process which has simple and reliable process, low cost and easy popularization and application, so that the prepared light alloy plate has refined crystal grains, weakened texture and improved mechanical property, and is an ideal alloy plastic processing mode with low cost, short flow and high performance;
(2) because the liner plate can enable the stress of the plate to be more uniform in the deformation process, the composite forming method can greatly improve the single-pass reduction and reduce the rolling passes;
(3) the composite forming method can obviously improve the yield of the light alloy plate and effectively limit the edge crack problem of the plate;
(4) the design of the wedge-shaped bulge leads the composite forming method to introduce strong local transverse shear deformation in the process of preparing the plate, compared with the traditional rolling process, the widening deformation of the light alloy plate in the width direction is effectively realized, the stress of the plate is more complicated, the anisotropy of the crystal grain orientation is increased, and the texture of the plate is obviously weakened;
(5) the composite forming method can more accurately control the thickness of the finally formed plate, and is very suitable for preparing thin plates;
(6) the composite forming method is also particularly suitable for plastic forming of zinc alloy, manganese alloy, metal matrix composite materials and the like.
Drawings
FIG. 1 is a schematic view of a cemented carbide liner plate having grooves and wedge shaped protrusions;
FIG. 2a is a front view of a cemented carbide liner plate with grooves and wedge shaped protrusions;
FIG. 2b is a left side view of a cemented carbide liner plate with grooves and wedge shaped protrusions;
FIG. 2c is a top view of a cemented carbide liner plate with grooves and wedge shaped protrusions;
FIG. 2d is a cross-sectional view A-A of a cemented carbide liner plate with grooves and wedge shaped protrusions;
FIG. 3 is a schematic flow diagram of the process of the present invention.
Detailed Description
As shown in fig. 1 and fig. 2a to fig. 2d, the cemented carbide lining plate of the present invention is rectangular, a rectangular groove is formed on the upper surface of the lining plate, a wedge-shaped protrusion is arranged at the center of the groove, and the wedge-shaped protrusion is arranged along the rolling direction;
the groove size of the hard alloy lining plate is longer than that of the light alloy plate in the rolling direction, the transverse width of the hard alloy lining plate is equal to the width of the light alloy plate and the width of the wedge-shaped bulge in the center of the lining plate, the height of the groove of the hard alloy lining plate is 0.5-5 mm, and the length and the width of the groove are 30-280 mm and 10-100 mm.
Example 1
(1) Selecting a hard alloy lining plate with a height of 3 mm and a groove and a wedge-shaped bulge, wherein the height of the groove is 1 mm;
(2) selecting a magnesium alloy extrusion plate which comprises the components of Mg-2Al-0.8Sn (wt.%), has the thickness of 5 mm and is smooth on the upper surface and the lower surface;
(3) uniformly coating a high-temperature lubricant on the surfaces of the lining plate and the magnesium alloy, and simultaneously putting the magnesium alloy extrusion plate and the lining plate into a mobile heating box at the temperature of 300 ℃ for heating;
(4) standing and preserving heat for 10 minutes;
(5) placing the lining plate on the lower surface of the magnesium alloy plate, and simultaneously pushing the lining plate and the Mg-2Al-0.8Sn extrusion plate to the inlet of the roller;
(6) and (5) repeating the steps (3) and (5), wherein the liner plate and the magnesium alloy plate are not turned over in the deformation process, the deformation is finished in four passes, and the reduction of each pass is 33%.
The average grain size of the formed plate is 2.8 mu m, the yield strength is 255MPa, the tensile strength is 288MPa, and the elongation at break is 24.6%.
Example 2
(1) Selecting a hard alloy lining plate with a height of 3 mm and a groove and a wedge-shaped bulge, wherein the height of the groove is 1 mm;
(2) selecting a 4 mm-thick Mg-3Al-1Zn (wt.%) sub-rapid casting plate with smooth upper and lower surfaces;
(3) uniformly coating a high-temperature lubricant on the surfaces of the lining plate and the magnesium alloy, and simultaneously putting the magnesium alloy plate and the lining plate into a movable heating box with the temperature of 400 ℃ for heating;
(4) standing and preserving heat for 10 minutes;
(5) and (3) placing the lining plate on the lower surface of the magnesium alloy plate, simultaneously pushing the lining plate and the magnesium alloy to a roller for single-pass rolling, wherein the reduction is 75%.
The average grain size of the formed plate is 3.5 mu m, the yield strength is 221MPa, the tensile strength is 278MPa, and the elongation at break is 22.4%.
Example 3
(1) Selecting a hard alloy lining plate with a height of 5 mm and a groove and a wedge-shaped bulge, wherein the height of the groove is 2 mm;
(2) selecting a 6022 aluminum alloy cast-rolled plate with the thickness of 5 mm and smooth upper and lower surfaces;
(3) uniformly coating a high-temperature lubricant on the surfaces of the lining plate and the aluminum alloy, and placing the lining plate on the lower surface of the aluminum alloy plate;
(4) and simultaneously pushing the lining plate and the aluminum alloy to a roller for single-pass cold rolling, wherein the reduction is 60%.
And carrying out T4 heat treatment on the formed plate to obtain the formed plate with the average grain size of 32.7 mu m, the yield strength of 120MPa, the tensile strength of 263MPa and the elongation at break of 30%.
Claims (7)
1. A light alloy rolling composite forming process method capable of controlling edge cracking is characterized by comprising the following specific steps:
(1) uniformly coating a high-temperature lubricant on the surfaces of the hard alloy lining plate and the light alloy plate, and fixing the light alloy plate on the groove of the lining plate;
(2) putting the light alloy and the alloy lining plate into a heating box, heating to the temperature of 100 ℃ and 450 ℃, standing and preserving heat for 5-30 minutes;
(3) simultaneously feeding the hard alloy lining plate and the light alloy plate between rollers, and synchronously rolling the hard alloy lining plate and the light alloy plate together;
the hard alloy lining plate is rectangular, a rectangular groove is formed in the center of the upper surface of the lining plate, a wedge-shaped bulge is arranged in the middle of the groove, and the wedge-shaped bulge is arranged along the rolling direction; the light alloy plate is a magnesium, magnesium alloy, aluminum alloy, titanium or titanium alloy plate; the length of the hard alloy lining plate is 40-300 mm, the width is 15-150 mm, and the height is 1-30 mm; the size of the groove of the hard alloy lining plate is longer than that of the light alloy plate in the rolling direction, the transverse width of the groove is equal to the width of the light alloy plate and the width of the central bulge of the lining plate, the height of the groove of the hard alloy lining plate is 0.5-5 mm, and the length and the width of the groove are 30-280 mm and 10-100 mm; the height of the wedge-shaped bulge on the hard alloy lining plate is the same as that of the length groove, the height is 0.5-5 mm and 30-280 mm, and the width of the wedge-shaped bulge is 0.5-5 mm.
2. The light alloy rolling composite forming process method with controllable edge crack as claimed in claim 1, wherein the hardness of the cemented carbide lining plate is lower than the surface hardness of the roller.
3. The light alloy rolling composite forming process method with controllable edge crack as claimed in claim 1, wherein when the rolled light alloy plate is an aluminum alloy, the step (2) is omitted.
4. The light alloy rolling composite forming process method with the controllable edge crack as claimed in claim 1, wherein the step (1) to the step (3) are repeated, and multiple rolling passes are performed.
5. The light alloy rolling composite forming process method with controllable edge crack as claimed in claim 1 or 4, characterized in that, in the step (3) of synchronous rolling, the single-pass reduction is 1-85%.
6. The light alloy rolling composite forming process method with controllable edge crack as claimed in claim 5, wherein the size of the roll gap is the same as the height of the cemented carbide lining plate in the last rolling process.
7. The light alloy rolling composite forming process method with controllable edge crack of claim 1, 2, 3, 4 or 6, wherein the height of the light alloy plate is 3-50 mm higher than that of the groove of the cemented carbide lining plate.
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| CN113477706A (en) * | 2021-07-15 | 2021-10-08 | 太原理工大学 | Nano-lubrication-based micro-flexible rolling method for laminated metal composite thin strip |
| CN114132022B (en) * | 2021-11-02 | 2022-08-16 | 河海大学 | Wedge-shaped lining plate for hard brittle high-modulus magnesium alloy and edge crack control rolling method and application thereof |
| CN115228935A (en) * | 2022-07-07 | 2022-10-25 | 中南大学 | Cold rolling process method for high-strength aluminum alloy ribbed thin-wall plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044422A (en) * | 1990-01-23 | 1990-08-08 | 丰润县冶金工业公司 | Single wedge pre-cutting splitting rolling angle steel technology and pass structure |
| JP2001191101A (en) * | 1999-12-28 | 2001-07-17 | Nkk Corp | Method of manufacturing for metal plate having different thickness |
| CN104056859A (en) * | 2014-06-13 | 2014-09-24 | 重庆大学 | Rolling compounding method for aluminum/magnesium/titanium three-layer composite plate |
| CN105478518A (en) * | 2014-09-15 | 2016-04-13 | 怀宁汉升车辆部件有限公司 | Production technology of steel-copper bimetal composite material for bearing manufacture |
| CN106862271A (en) * | 2017-03-17 | 2017-06-20 | 燕山大学 | A kind of method that different temperature rolling prepares titanium aluminum composite plate |
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2020
- 2020-12-14 CN CN202011469369.9A patent/CN112718861B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044422A (en) * | 1990-01-23 | 1990-08-08 | 丰润县冶金工业公司 | Single wedge pre-cutting splitting rolling angle steel technology and pass structure |
| JP2001191101A (en) * | 1999-12-28 | 2001-07-17 | Nkk Corp | Method of manufacturing for metal plate having different thickness |
| CN104056859A (en) * | 2014-06-13 | 2014-09-24 | 重庆大学 | Rolling compounding method for aluminum/magnesium/titanium three-layer composite plate |
| CN105478518A (en) * | 2014-09-15 | 2016-04-13 | 怀宁汉升车辆部件有限公司 | Production technology of steel-copper bimetal composite material for bearing manufacture |
| CN106862271A (en) * | 2017-03-17 | 2017-06-20 | 燕山大学 | A kind of method that different temperature rolling prepares titanium aluminum composite plate |
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