CN111922076A - Novel hot rolling composite pass process for aluminum alloy composite ingot - Google Patents
Novel hot rolling composite pass process for aluminum alloy composite ingot Download PDFInfo
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- CN111922076A CN111922076A CN202010670314.8A CN202010670314A CN111922076A CN 111922076 A CN111922076 A CN 111922076A CN 202010670314 A CN202010670314 A CN 202010670314A CN 111922076 A CN111922076 A CN 111922076A
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- ingot
- rolling
- composite
- composite ingot
- aluminum alloy
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- 239000002131 composite material Substances 0.000 title claims abstract description 85
- 238000005098 hot rolling Methods 0.000 title claims abstract description 31
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 65
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 23
- 239000000956 alloy Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 3
- 238000005219 brazing Methods 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 13
- 238000007872 degassing Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 13
- 239000012467 final product Substances 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 42
- 238000013329 compounding Methods 0.000 description 9
- 239000000047 product Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- 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
-
- 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
- B21B2003/001—Aluminium or its alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a new hot rolling composite pass process of an aluminum alloy composite ingot, which comprises the following steps: (1) putting the milled intermediate layer alloy and the brazed layer alloy into a heating furnace for heating and heat preservation; (2) discharging the composite ingot and conveying the composite ingot to a roll gap of a rolling mill, conveying the composite ingot to the center of a roller, and aligning the 1/2 position of the length of the composite ingot with a working roller; (3) setting a system of a rolling mill into a constant rolling force mode, and setting a rolling force of 1000-3000 KN; (4) slowly descending the upper working roller to the surface of the composite ingot, and rolling the composite ingot to the head of the composite ingot at the speed of 20-60 m/min; (5) opening a roll gap of a rolling mill, and biting the head of the composite cast ingot into the roll gap of the rolling mill; (6) slowly descending the upper working roller to the surface of the composite ingot, and rolling towards the tail of the ingot at the speed of 20-60 m/min; (7) and (4) switching the system of the rolling mill to a roll gap mode, and carrying out hot rolling on the subsequent passes according to the conventional roll gap mode. The invention effectively reduces the bubble defect and improves the yield of the final product.
Description
Technical Field
The invention relates to the field of metal processing, in particular to a new hot rolling composite pass process for an aluminum alloy composite ingot.
Background
When metal composite plates such as aluminum alloy and the like are processed, a plurality of plates are compounded, hot rolled and cast into ingots; in the existing hot rolling compounding of the aluminum alloy composite ingot, the method adopted in the compounding pass is a fixed roll gap mode (constant roll gap), the head is bitten, the tail is thrown out, and the 1 st pass is pressed over the length of the whole composite ingot, so that the method has the defects that the local combination of a brazing layer and an intermediate layer is poor and the bubble defect is finally formed because the composite ingot has certain thickness deviation and roll gap influence along the length direction and the 1 st pass rolling force has obvious fluctuation; in addition, the 1 st pass is rolled from head to tail, the rolling distance is long, complete exhaust between the brazing layer and the intermediate layer is not facilitated, and finally bubble defects can be caused due to gas residues, and finally the bubble defects can influence the yield of products and cause extra economic loss.
Disclosure of Invention
The invention aims to reduce the number of bubble defects formed between a brazing layer and an intermediate layer in the hot rolling composite processing process of an aluminum alloy composite ingot, improve the yield of final products, and design a new process of hot rolling composite pass of the aluminum alloy composite ingot.
The technical scheme of the invention is that the novel process for hot rolling composite pass of the aluminum alloy composite ingot is formed by hot rolling and compounding a brazing layer alloy, an intermediate layer alloy and a brazing layer alloy after the brazing layer alloy, the novel process for hot rolling composite pass comprises the following processing steps:
s1, milling the intermediate layer alloy and the two layers of brazing layer alloys, then carrying out composite ingot casting on the milled intermediate layer alloy and the milled brazing layer alloy, and loading the ingot casting into a heating furnace for heating and heat preservation;
s2, tapping and conveying the composite ingot which is heated and insulated in the step S1 to a roll gap of a rolling mill, conveying the composite ingot to the center of a roller, and aligning the 1/2 position of the length of the composite ingot with a working roller;
s3, setting the system of the rolling mill to be in a constant rolling force mode, and setting the rolling force of 1000-3000 KN;
s4, slowly descending the upper working roll to the surface of the composite ingot, and rolling the composite ingot to the head of the composite ingot at a speed of 20-60 m/min;
s5, opening a roll gap of the rolling mill after the step S4 is completed, and biting the head of the composite cast ingot into the roll gap of the rolling mill;
s6, slowly descending the upper working roll to the surface of the composite ingot, and rolling towards the tail of the ingot at a speed of 20-60 m/min;
and S7, after the step S6 is completed, switching the system of the rolling mill to a roll gap mode, and carrying out hot rolling on the subsequent passes according to a conventional roll gap mode.
As a further illustration of the present invention, the heating temperature in the step S1 is 490-520 ℃.
As a further explanation of the present invention, the heating time in the step S1 is 10h-16 h.
As a further illustration of the present invention, the temperature in said step S1 is 480 ℃ -500 ℃.
As a further illustration of the invention, the holding time in step S1 is 2h-6 h.
As a further explanation of the present invention, in step S2, the rolling mill starts rolling from the middle position of the composite ingot, and the degassing distances of the 1 st and 2 nd passes are equally divided.
As a further explanation of the present invention, in the step S4 and the step S6, the rolling force of the rolling mill for rolling the head and the tail of the ingot is 1000-3000 KN.
The method has the beneficial effects that in the hot rolling compounding operation of the compound cast ingot, the compound cast ingot is subjected to exhaust compounding by rolling from the middle position of the compound cast ingot to the head part of the compound cast ingot in the 1 st pass, and then is rolled to the tail part of the compound cast ingot, so that the compound cast ingot is exhausted in two sections, and the exhaust is more thorough due to the short distance; and the 1 st pass adopts the constant rolling force of 1000-3000KN instead of the constant roll gap, and the constant rolling force ensures that the brazing layer and the intermediate layer are stressed uniformly in the rolling process, so that the air exhaust and the combination are more sufficient, thereby reducing the bubble defects and improving the yield of the final product.
Drawings
FIG. 1 is a schematic structural view of an aluminum alloy composite ingot according to the present invention;
FIG. 2 is an electron scanning view of bubbles between an aluminum alloy composite brazing layer and an intermediate layer rolled by a conventional hot rolling process;
FIG. 3 is an electron scanning view of bubbles between a brazing layer and an intermediate layer of an aluminum alloy composite ingot rolled by the hot rolling process provided by the invention.
In the figure, 1, brazing layer alloy; 2. an interlayer alloy.
Detailed Description
Firstly, the design of the invention is designed originally, the defect that air bubbles are formed between a brazing layer and an intermediate layer in the hot rolling process of an aluminum alloy composite ingot can not be eliminated in the subsequent process, the finished product rate of a final product can be influenced, and in order to improve the finished product rate and reduce the defect caused by the air bubbles, the existing processing technology is improved, particularly the hot rolling composite pass is improved.
As shown in fig. 1, the aluminum alloy composite ingot is formed by sequentially laminating a brazing layer alloy, an intermediate layer alloy and a brazing layer alloy and then hot-rolling and compounding the aluminum alloy composite ingot, the technical scheme of the invention is to improve the hot-rolling compounding process of the aluminum alloy composite ingot, and relates to a new process of hot-rolling compounding pass of the aluminum alloy composite ingot, which comprises the following processing steps:
s1, milling the intermediate layer alloy and the two layers of brazing layer alloys, then putting the milled intermediate layer alloy and the brazed layer alloy into a composite ingot, heating in a heating furnace at 490-520 ℃ for 10-16 h, and at 480-500 ℃ for 2-6 h, and preserving heat;
s2, tapping and conveying the composite ingot which is heated and heat-preserved in the step S1 to a roll gap of a rolling mill, conveying the composite ingot to the center position of a roll, aligning the 1/2 position of the length of the composite ingot with a working roll, starting rolling by the rolling mill from the middle position of the composite ingot, and enabling degassing distances of the 1 st and 2 nd passes to be uniform, wherein if the degassing distances of the composite ingot are from other positions, the composite ingot and the degassing effect are influenced;
s3, setting the system of the rolling mill to be a constant rolling force mode, setting the rolling force of 1000-3000KN, wherein the constant rolling force mode can ensure the uniform stress of the composite ingot in the rolling process;
s4, slowly descending the upper working roll to the surface of the composite ingot, achieving the rolling force of 1000-3000KN, and rolling the composite ingot to the head of the composite ingot at the speed of 20-60 m/min, wherein the speed is moderate, and the composite effect can be influenced by over-slow speed or over-fast speed;
s5, opening a roll gap of the rolling mill after the step S4 is completed, and biting the head of the composite cast ingot into the roll gap of the rolling mill;
s6, slowly descending the upper working roll to the surface of the composite ingot, reaching the rolling force of 1000-3000KN, and rolling towards the tail part of the ingot at the speed of 20-60 m/min;
and S7, after the step S6 is completed, switching the system of the rolling mill to a roll gap mode, and carrying out hot rolling on the subsequent passes according to a conventional roll gap mode.
The method adopted by the existing composite pass is characterized in that a roll gap mode (constant roll gap) is fixed, the composite ingot is bitten from the head part and thrown out from the tail part during the composite, and the 1 st pass is pressed over the length of the whole composite ingot, so that the 1 st pass rolling force obviously fluctuates due to certain thickness deviation and roll gap influence of the composite ingot along the length direction, a brazing layer and an intermediate layer are partially poorly combined, and finally a bubble defect is formed; in addition, the 1 st pass is rolled from head to tail, the rolling distance is long, complete exhaust between the brazing layer and the intermediate layer is not facilitated, and finally bubble defects are caused due to gas residues. The improved process selects rolling from the middle position of the aluminum alloy composite ingot during rolling, equally divides two sections to remove gas, uses a constant rolling force mode, and passes multiple tests, the rolling force of 1000-3000KN is most moderate, so that the stress of a brazing layer and an intermediate layer in the whole rolling process is uniform, the degassing and bonding effects during compounding are greatly improved, and the bubble defects are effectively reduced.
As shown in fig. 2 and 3, fig. 2 is an electron scanning diagram of bubbles between an aluminum alloy composite brazing layer and an intermediate layer rolled by a conventional hot rolling process, and it can be easily found from the figure that the content of bubbles is very large; FIG. 3 is an electronic scanning diagram of bubbles between a brazing layer and an intermediate layer of an aluminum alloy composite ingot rolled by the hot rolling process provided by the invention, the bubbles in the diagram are obviously reduced a lot, the bubble defect rejection rate is reduced from about 0.65% to about 0.35%, and the yield of products is effectively improved.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (7)
1. The novel hot rolling composite pass process for the aluminum alloy composite ingot is characterized by comprising the following processing steps of:
s1, milling the intermediate layer alloy and the two layers of brazing layer alloys, then carrying out composite ingot casting on the milled intermediate layer alloy and the milled brazing layer alloy, and loading the ingot casting into a heating furnace for heating and heat preservation;
s2, tapping and conveying the composite ingot which is heated and insulated in the step S1 to a roll gap of a rolling mill, conveying the composite ingot to the center of a roller, and aligning the 1/2 position of the length of the composite ingot with a working roller;
s3, setting the system of the rolling mill to be in a constant rolling force mode, and setting the rolling force of 1000-3000 KN;
s4, slowly descending the upper working roll to the surface of the composite ingot, and rolling the composite ingot to the head of the composite ingot at a speed of 20-60 m/min;
s5, opening a roll gap of the rolling mill after the step S4 is completed, and biting the head of the composite cast ingot into the roll gap of the rolling mill;
s6, slowly descending the upper working roll to the surface of the composite ingot, and rolling towards the tail of the ingot at a speed of 20-60 m/min;
and S7, after the step S6 is completed, switching the system of the rolling mill to a roll gap mode, and carrying out hot rolling on the subsequent passes according to a conventional roll gap mode.
2. The new hot rolling compound pass process for aluminum alloy composite ingots according to claim 1, wherein the heating temperature in the step S1 is 490-520 ℃.
3. The new hot rolling compound pass process of the aluminum alloy composite ingot as claimed in claim 1, wherein the heating time in the step S1 is 10-16 h.
4. The new hot rolling compound pass process for the aluminum alloy composite ingot as claimed in claim 1, wherein the temperature maintaining temperature in the step S1 is 480-500 ℃.
5. The new hot rolling compound pass process of the aluminum alloy composite ingot as claimed in claim 1, wherein the holding time in the step S1 is 2-6 h.
6. The new hot rolling compound pass process of the aluminum alloy composite ingot as claimed in claim 1, wherein in the step S2, the rolling mill starts rolling from the middle position of the compound ingot, and the degassing distances of the 1 st and 2 nd passes are equally divided.
7. The new hot rolling compound pass process for the aluminum alloy composite ingot as claimed in claim 1, wherein the rolling force of the rolling mill for rolling the head and the tail of the ingot in steps S4 and S6 is 1000-3000 KN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010670314.8A CN111922076B (en) | 2020-07-13 | 2020-07-13 | Novel hot rolling composite pass process for aluminum alloy composite ingot |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010670314.8A CN111922076B (en) | 2020-07-13 | 2020-07-13 | Novel hot rolling composite pass process for aluminum alloy composite ingot |
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| CN111922076A true CN111922076A (en) | 2020-11-13 |
| CN111922076B CN111922076B (en) | 2022-03-01 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101069941A (en) * | 2007-06-13 | 2007-11-14 | 潍坊三源铝业有限公司 | Method for preparing aluminium alloy composite material for brazing type heat transmission |
| CN102581006A (en) * | 2012-02-27 | 2012-07-18 | 燕山大学 | Hot-rolling compounding method for titanium/aluminum/titanium three-layer composite plate |
| CN110303044A (en) * | 2019-06-06 | 2019-10-08 | 北京科技大学设计研究院有限公司 | A kind of control method of aluminum composite plate roughing mill bonding passes |
| CN110665969A (en) * | 2019-10-09 | 2020-01-10 | 北京科技大学 | Preparation method of high-performance titanium/steel bimetal composite board |
| CN110976519A (en) * | 2019-12-17 | 2020-04-10 | 奥科宁克（昆山）铝业有限公司 | Production method of four-layer aluminum alloy composite plate strip blank |
| EP3650133A1 (en) * | 2018-11-12 | 2020-05-13 | Ilsenburger Grobblech GmbH | Package and method for producing rolled composite materials from a package compiled from material packages |
-
2020
- 2020-07-13 CN CN202010670314.8A patent/CN111922076B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101069941A (en) * | 2007-06-13 | 2007-11-14 | 潍坊三源铝业有限公司 | Method for preparing aluminium alloy composite material for brazing type heat transmission |
| CN102581006A (en) * | 2012-02-27 | 2012-07-18 | 燕山大学 | Hot-rolling compounding method for titanium/aluminum/titanium three-layer composite plate |
| EP3650133A1 (en) * | 2018-11-12 | 2020-05-13 | Ilsenburger Grobblech GmbH | Package and method for producing rolled composite materials from a package compiled from material packages |
| CN110303044A (en) * | 2019-06-06 | 2019-10-08 | 北京科技大学设计研究院有限公司 | A kind of control method of aluminum composite plate roughing mill bonding passes |
| CN110665969A (en) * | 2019-10-09 | 2020-01-10 | 北京科技大学 | Preparation method of high-performance titanium/steel bimetal composite board |
| CN110976519A (en) * | 2019-12-17 | 2020-04-10 | 奥科宁克（昆山）铝业有限公司 | Production method of four-layer aluminum alloy composite plate strip blank |
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