CN109622630A - Heat-resisting aluminium alloy pole stock rolling technological parameter on-line control method - Google Patents
Heat-resisting aluminium alloy pole stock rolling technological parameter on-line control method Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 214
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000000839 emulsion Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000002425 crystallisation Methods 0.000 claims description 36
- 230000008025 crystallization Effects 0.000 claims description 36
- 230000008569 process Effects 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 63
- 229910052782 aluminium Inorganic materials 0.000 description 63
- 229910052710 silicon Inorganic materials 0.000 description 33
- 239000010703 silicon Substances 0.000 description 33
- 239000010936 titanium Substances 0.000 description 33
- 239000007788 liquid Substances 0.000 description 28
- 229910052719 titanium Inorganic materials 0.000 description 25
- 229910052720 vanadium Inorganic materials 0.000 description 23
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 18
- 229910052796 boron Inorganic materials 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910045601 alloy Inorganic materials 0.000 description 16
- 239000000956 alloy Substances 0.000 description 16
- 238000002844 melting Methods 0.000 description 15
- 230000008018 melting Effects 0.000 description 15
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 13
- 229910052804 chromium Inorganic materials 0.000 description 13
- 239000011651 chromium Substances 0.000 description 13
- 229910018580 Al—Zr Inorganic materials 0.000 description 12
- 238000003723 Smelting Methods 0.000 description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 12
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 12
- 239000011572 manganese Substances 0.000 description 12
- 229910052726 zirconium Inorganic materials 0.000 description 12
- 230000000875 corresponding effect Effects 0.000 description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 10
- 229910052748 manganese Inorganic materials 0.000 description 10
- 238000003756 stirring Methods 0.000 description 10
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 10
- 238000005070 sampling Methods 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000005271 boronizing Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000007670 refining Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 238000007872 degassing Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910007727 Zr V Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- DJPURDPSZFLWGC-UHFFFAOYSA-N alumanylidyneborane Chemical compound [Al]#B DJPURDPSZFLWGC-UHFFFAOYSA-N 0.000 description 2
- -1 aluminum-titanium-boron Chemical compound 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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Abstract
The invention discloses heat-resisting aluminium alloy pole stock rolling technological parameter on-line control methods comprising following steps: (1) calculating theoretical finish rolling torque value；(2) on-line control rolling parameter；The present invention passes through the corresponding relationship between finish rolling torque and tensile strength, to adjust the technological parameter during controlled rolling, such as crystallize wheel speed, emulsion temperature, realize prejudging and controlling to heat-resisting aluminium alloy bar tensile strength index, first furnace, which can be produced, meets the heat-resisting aluminium alloy pole stock that user requires (referring mainly to tensile strength and conductivity), the adjustment period is greatly shortened, rejection rate is reduced, reduces cost of material.
Description
The technical field is as follows:
the invention relates to the field of aluminum alloy production, in particular to an online adjusting method for rolling technological parameters of a heat-resistant aluminum alloy rod
Background art:
at present, the domestic production process of aluminum and aluminum alloy rods (not less than 8mm) is mainly a continuous casting and rolling method, and in addition, the production process also comprises an extrusion method, a flow rod method and the like. Compared with the extrusion method and the flow rod method, the continuous casting and rolling method has the advantages of large yield, high efficiency, low production cost and stable product quality, and is a process mainly adopted for industrial production of aluminum and aluminum alloy rods. The main operation procedures of the continuous casting and rolling production process of aluminum and aluminum alloy rods (mainly electrical round aluminum rods) are as follows: (1) selecting proper raw aluminum and auxiliary materials thereof according to the product requirements; (2) cleaning the melting furnace to prevent the pollution of the raw aluminum, and enabling the furnace to reach the working condition; (3) charging the selected raw aluminum into a furnace according to the required weight; (4) controlling the temperature of the melting and holding furnace, and melting the raw aluminum or holding the temperature; (5) boronizing; (6) refining and slagging off; (7) sampling and analyzing; (8) rolling after the components are qualified.
At present, in the process of producing the heat-resistant aluminum alloy rod on line by adopting continuous casting and rolling, whether the produced heat-resistant aluminum alloy rod meets the design requirement cannot be judged, and whether the produced heat-resistant aluminum alloy rod meets the design requirement can be judged only by detecting and analyzing the performance of the heat-resistant aluminum alloy rod after the heat-resistant aluminum alloy rod is discharged from a furnace. However, if the performance of the heat-resistant aluminum alloy rod exceeds the standard (mainly the conductivity is low and cannot meet the requirement), the heat-resistant aluminum alloy rod can only be used as a waste product or a defective product to be subjected to furnace returning or price reduction treatment, then the reason for the performance exceeding of the heat-resistant aluminum alloy rod is analyzed according to the detection result, and the next furnace is subjected to casting and rolling process adjustment according to experience until the performance index of the heat-resistant aluminum alloy rod completely meets the requirement of a user. Although the method can finally produce the heat-resistant aluminum alloy rod material meeting the requirements of users, the adjustment is blindness because no theoretical basis is used as guidance, the adjustment period is long, waste products and defective products are generated, a large amount of raw materials are wasted, and the production cost is increased.
The invention content is as follows:
in order to save raw materials and reduce production cost, the invention provides an online adjusting method for rolling process parameters of a heat-resistant aluminum alloy rod.
The purpose of the invention is implemented by the following technical scheme: the method for adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod on line comprises the following steps: (1) calculating a theoretical finish rolling torque value; (2) adjusting rolling parameters on line; wherein,
(1) calculating a theoretical finish rolling torque value: according to the designed and required tensile strength and the corresponding relation between the finish rolling torque and the tensile strength, the theoretical finish rolling torque value of the heat-resistant aluminum alloy rod is measured in advance;
(2) adjusting rolling parameters on line: and in the process of rolling the heat-resistant aluminum alloy rod, real-time online comparison is carried out on the actual finish rolling torque value and the theoretical finish rolling torque value in the rolling process, and when the absolute value of the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is larger than 15 N.m, the absolute value of the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is not larger than 15 N.m by adjusting the emulsion temperature and/or the crystallization wheel speed.
Further, the relationship between the finish rolling torque and the tensile strength is as follows:
YMPa＝0.125XN·m+63
wherein, YMPaFor tensile strength, XN·mThe theoretical finishing rolling torque value is obtained.
Further, when the actual finish rolling torque value is larger than the theoretical finish rolling torque value, firstly increasing the emulsion temperature, and when the emulsion temperature reaches 60 ℃, still increasing the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value to be larger than 15 N.m, and increasing the speed of the crystallization wheel to ensure that the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is not larger than 15 N.m; or firstly increasing the speed of the crystallization wheel, and when the speed of the crystallization wheel reaches 2.0rpm, and the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is still larger than 15 N.m, increasing the temperature of the emulsion so that the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is not larger than 15 N.m.
Further, if the actual finish rolling torque value is smaller than the theoretical finish rolling torque value, firstly reducing the emulsion temperature, and when the emulsion temperature is reduced to 30 ℃, the difference between the theoretical finish rolling torque value and the actual finish rolling torque value is still larger than 15 N.m, reducing the speed of a crystallization wheel, so that the difference between the theoretical finish rolling torque value and the actual finish rolling torque value is not larger than 15 N.m; or reducing the speed of the crystallization wheel, and when the speed of the crystallization wheel is reduced to 1.9rpm, and the difference value between the theoretical finishing rolling torque value and the actual finishing rolling torque value is still larger than 15 N.m, reducing the temperature of the emulsion so that the difference value between the theoretical finishing rolling torque value and the actual finishing rolling torque value is not larger than 15 N.m.
Further, the corresponding relation between the finish rolling torque and the tensile strength is as follows: the tensile strength is increased with the increase of the finish rolling torque, and the tensile strength is increased by 1-2MPa when the finish rolling torque is increased by 10N m.
Further, the corresponding relation between the finish rolling torque and the rotating speed of the crystallization wheel is as follows: the finish rolling torque is reduced with the increase of the rotation speed of the crystallization wheel, and the finish rolling torque is reduced by 30-50 N.m when the rotation speed of the crystallization wheel is increased by 0.01 rpm.
Further, the corresponding relation between the finish rolling torque and the emulsion temperature is as follows: the finish rolling torque is reduced along with the increase of the emulsion temperature, and the finish rolling torque is reduced by 2-4 N.m when the emulsion temperature is increased by 1 ℃.
The invention discovers that under the condition that the components of the heat-resistant aluminum alloy rod are determined, the factor influencing the electric conductivity is mainly the tensile strength of the heat-resistant aluminum alloy rod, the electric conductivity of the heat-resistant aluminum alloy rod is contradictory to the tensile strength, and the higher the tensile strength of the heat-resistant aluminum alloy rod is, the lower the electric conductivity of the heat-resistant aluminum alloy rod is; it has also been found that the tensile strength of the heat-resistant aluminum alloy rod is positively correlated with the finish rolling torque in a certain proportion, and therefore, the tensile strength and the electric conductivity of the heat-resistant aluminum alloy rod can be controlled by controlling the finish rolling torque on line.
According to the method, the finish rolling torque is adjusted and controlled on line through the corresponding relation between the tensile strength of the heat-resistant aluminum alloy rod and the finish rolling torque, and the finish rolling torque is adjusted and controlled by technological parameters in the rolling process, such as the speed of a crystallization wheel and the temperature of emulsion, so that the tensile strength of the rolled heat-resistant aluminum alloy rod is controlled on line in advance.
The invention has the advantages that:
(1) according to the invention, the finish rolling torque is controlled by adjusting the speed of the crystallization wheel and the temperature of the emulsion on line, so that the tensile strength index of the heat-resistant aluminum alloy rod is judged and controlled in advance, the heat-resistant aluminum alloy rod material meeting the user requirements (mainly referring to tensile strength and conductivity) can be produced by the first furnace, the adjustment period is greatly shortened, the rejection rate is reduced, and the raw material cost is reduced; (2) the method generally adjusts the speed of the crystallization wheel and the temperature of the emulsion through the finish rolling torque, and the control method is simple and practical to operate, strong in pertinence, quick and effective.
Drawings
FIG. 1 is a flow chart of an on-line control method of rolling process parameters.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1: the method for adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material on line is used for adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material on line and comprises the following steps: (1) adding the low-silicon raw aluminum liquid meeting the requirements into the cleaned melting and holding furnace; (2) reacting vanadium, titanium, manganese and chromium in the low-silicon primary aluminum liquid with boron through boronizing treatment to generate a boron-containing compound, and then refining, degassing and removing impurities; (3) standing after slagging off, and then turning down the furnace to remove the boron-containing compound precipitated at the bottom of the melting and maintaining furnace to obtain a low-vanadium and low-titanium aluminum melt; (4) adding Al-Zr intermediate alloy into the low-vanadium and low-titanium aluminum melt, and stirring, smelting and alloying to obtain a heat-resistant aluminum alloy melt with the zirconium content of 0.01-0.10 wt%; (5) casting and rolling the heat-resistant aluminum alloy melt with the zirconium content of 0.01-0.10 wt% to obtain a heat-resistant aluminum alloy rod material, and controlling the rolling process parameters by an online control method of the rolling process parameters in the rolling process. Wherein,
(1) putting the molten aluminum at the bottom of the melting and maintaining furnace as clean as possible, then carrying out cold cleaning on the furnace bottom and the furnace wall after the furnace bottom and the furnace wall are hot cleaned, and then carrying out primary washing by using the original aluminum liquid; and adding the low-silicon raw aluminum liquid meeting the requirements into the cleaned melting and holding furnace, wherein the mass percentage of aluminum in the low-silicon raw aluminum liquid is 99.84%.
The chemical composition table of the low-silicon primary aluminum liquid is as follows: is based on
| Fe | Si | B | Zr | V+Ti+Mn+Cr | Al |
| 0.08 | 0.05 | 0.0007 | 0.0008 | 0.013 | 99.84 |
(2) Boronizing treatment: sampling and analyzing the components of the low-silicon primary aluminum liquid, and according to the mass percentage content C of V + Ti in the low-silicon primary aluminum liquidV+TiDetermining the mass percentage content C of the additive BBSo that C isV+Ti：CB2: 1; adding a metered aluminum-boron intermediate alloy into a chute in the process of adding low-silicon primary aluminum liquid through the chute, flushing with the low-silicon primary aluminum liquid, adding the low-silicon primary aluminum liquid into a melting furnace along with the low-silicon primary aluminum liquid, stirring for 10min, and then starting a boronization reaction to react vanadium, titanium, manganese, chromium and boron in the low-silicon primary aluminum liquid to generate a boron-containing compound; the boronization temperature is 761 ℃, and the boronization time is 90 min;
refining at 760 deg.C for 40min, degassing, and removing impurities.
(3) Slagging off is carried out after refining, standing is carried out for 120min after slagging off, then sampling is carried out, detection and analysis are carried out on the components of the aluminum melt, and when the chemical components of the aluminum melt meet the following conditions: when the total weight of the iron, the silicon and the chromium is 0.08 percent by weight, 0.05 percent by weight, 0.0009 percent by weight and 0.0019 percent by weight of the total weight of the vanadium, the titanium, the manganese and the chromium, turning down the furnace, and removing the boron-containing compound precipitated at the bottom of the melting and retaining furnace to obtain a low-vanadium and low-titanium aluminum melt; the amount of furnace transfer is 97 percent of the mass of the low-silicon primary aluminum liquid.
(4) Adding Al-Zr intermediate alloy into the low-vanadium and low-titanium aluminum melt at the addition temperature of 770 ℃, adding the intermediate alloy twice because the quality of the low-vanadium and low-titanium aluminum melt after pouring cannot be accurately estimated, and stirring, smelting and alloying to obtain the heat-resistant aluminum alloy melt with the zirconium content of 0.09 wt%; stirring and smelting for 30min after adding Al-Zr intermediate alloy for the first time, wherein the smelting temperature is 770 ℃, sampling and analyzing components, then calculating the total mass of the low-vanadium and low-titanium aluminum melt in a reverse manner, and calculating the mass of the Al-Zr intermediate alloy added for the second time; and stirring and smelting for 30min after adding the Al-Zr intermediate alloy for the second time, wherein the smelting temperature is 770 ℃.
(5) After Al-Zr intermediate alloy is added and smelted, sampling and analyzing components, and when the components meet the requirements of 0.08% wt. of iron, 0.05% wt. of silicon, 0.009% wt. of boron, 0.09% wt. of zirconium, 0.0019% wt. of the total amount of vanadium, titanium, manganese and chromium and the balance of aluminum in the heat-resistant aluminum alloy melt, casting and rolling without using an aluminum-titanium-boron wire refiner to obtain the heat-resistant aluminum alloy rod. And in the rolling process, the rolling process parameters are controlled by an online control method of the rolling process parameters.
The online control method of the rolling process parameters comprises the following steps: (1) calculating a theoretical finish rolling torque value; (2) adjusting rolling parameters on line; wherein,
(1) calculating a theoretical finish rolling torque value: according to the design and the required tensile strength and the corresponding relation between the finish rolling torque and the tensile strength: increasing the tensile strength along with the increase of the finish rolling torque, increasing the tensile strength by 1-2MPa every time the finish rolling torque is increased by 10 N.m, and measuring out the theoretical finish rolling torque value of the heat-resistant aluminum alloy rod material in advance; in this example, the tensile strength was designed and required to be 100MPa, and the relationship (Y) between the tensile strength and the finish rolling torque was determinedMPa＝0.125XN·m+63) the theoretical finish rolling torque value of the heat-resistant aluminum alloy bar was calculated to be 296N · m, wherein Y isMPaFor tensile strength, XN·mThe theoretical finishing rolling torque value is obtained.
(2) Adjusting rolling parameters on line: in the embodiment, in the initial rolling process of the heat-resistant aluminum alloy rod, the detected rolling process parameters are as follows:
pouring temperature: 682 ℃;
blank temperature: 526 ℃;
total pressure of cooling water: 343 Pa;
the water inlet temperature is as follows: 15 ℃;
speed of the crystallization wheel: 1.87 rpm;
finish rolling torque: 490 N.m
Emulsion temperature: 30 ℃;
the rod-out temperature: 92 deg.C.
The actual finish rolling torque value in the rolling process is compared with the theoretical finish rolling torque value in real time on line, in the embodiment, the detected actual finish rolling torque value is 490 N.m,
and when the emulsion temperature reaches 60 ℃, the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is 104 N.m and still is more than 15 N.m, the speed of the crystallization wheel is increased, and when the speed of the crystallization wheel is 1.90rpm, the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is 13 N.m and is not more than 15 N.m.
The corresponding relation between the finish rolling torque and the rotating speed of the crystallization wheel is as follows: the finish rolling torque is reduced with the increase of the rotation speed of the crystallization wheel, and the finish rolling torque is reduced by 30-50 N.m when the rotation speed of the crystallization wheel is increased by 0.01 rpm.
The corresponding relation between the finish rolling torque and the emulsion temperature is as follows: the finish rolling torque is reduced along with the increase of the emulsion temperature, and the finish rolling torque is reduced by 2-4 N.m when the emulsion temperature is increased by 1 ℃.
After the online adjustment, the present embodiment operates according to the following rolling process parameters:
pouring temperature: 682 ℃;
blank temperature: 526 ℃;
total pressure of cooling water: 343 Pa;
the water inlet temperature is as follows: 15 ℃;
speed of the crystallization wheel: 1.90rpm rpm;
finish rolling torque: 309N · m
Emulsion temperature: 60 ℃;
the rod-out temperature: 92 deg.C.
The heat-resistant aluminum alloy rod material prepared by the embodiment comprises the following chemical components in percentage by mass: 0.08 percent of iron, 0.05 percent of silicon, 0.0009 percent of boron, 0.09 percent of zirconium, 0.0019 percent of vanadium, titanium, manganese and chromium in total mass percent, and the balance of aluminum.
The heat-resistant aluminum alloy rod material prepared by the embodiment has the following properties:
| nominal diameter/mm | Tensile strength/MPa | Elongation/percent | Conductivity/% IACS |
| 9.5 | 100 | 19 | 63.0 |
The heat-resistant aluminum alloy conductor made by using the heat-resistant aluminum alloy rod of the embodiment has the following properties:
| heat resistance/% | Conductivity/% IACS | strength/MPa |
| 98 | 62.5 | 161 |
Example 2: the difference between this example and example 1 is that the rolling process parameters were not controlled by the online control method of the rolling process parameters during the rolling process, and the same rolling process parameters during the initial rolling process of the heat-resistant aluminum alloy rod material as in example 1 were used.
The heat-resistant aluminum alloy rod material prepared by the embodiment comprises the following chemical components in percentage by mass: 0.08 percent of iron, 0.05 percent of silicon, 0.0009 percent of boron, 0.09 percent of zirconium, 0.0019 percent of vanadium, titanium, manganese and chromium in total mass percent, and the balance of aluminum.
The heat-resistant aluminum alloy rod material prepared by the embodiment has the following properties:
| nominal diameter/mm | Tensile strength/MPa | Elongation/percent | Conductivity/% IACS |
| 9.5 | 124 | 15 | 62.2 |
The heat-resistant aluminum alloy conductor made by using the heat-resistant aluminum alloy rod of the embodiment has the following properties:
| heat resistance/% | Conductivity/% IACS | strength/MPa |
| 98 | 61.7 | 185 |
Compared with the embodiment 1, the embodiment does not adopt the method of the invention to carry out on-line process parameter adjustment, and although the strength of the heat-resistant aluminum alloy wire is kept at a higher level, the conductivity is obviously reduced.
Example 3: the method for adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material on line is used for adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material on line and comprises the following steps: (1) adding the low-silicon raw aluminum liquid meeting the requirements into the cleaned melting and holding furnace; (2) reacting vanadium, titanium, manganese and chromium in the low-silicon primary aluminum liquid with boron through boronizing treatment to generate a boron-containing compound, and then refining, degassing and removing impurities; (3) standing after slagging off, and then turning down the furnace to remove the boron-containing compound precipitated at the bottom of the melting and maintaining furnace to obtain a low-vanadium and low-titanium aluminum melt; (4) adding Al-Zr intermediate alloy into the low-vanadium and low-titanium aluminum melt, and stirring, smelting and alloying to obtain a heat-resistant aluminum alloy melt with the zirconium content of 0.01-0.10 wt%; (5) casting and rolling the heat-resistant aluminum alloy melt with the zirconium content of 0.01-0.10 wt% to obtain a heat-resistant aluminum alloy rod material, and controlling the rolling process parameters by an online control method of the rolling process parameters in the rolling process. Wherein,
(1) putting the molten aluminum at the bottom of the melting and maintaining furnace as clean as possible, then carrying out cold cleaning on the furnace bottom and the furnace wall after the furnace bottom and the furnace wall are hot cleaned, and then carrying out primary washing by using the original aluminum liquid; and adding the low-silicon raw aluminum liquid meeting the requirements into the cleaned melting and holding furnace, wherein the mass percentage of aluminum in the low-silicon raw aluminum liquid is 99.82%.
The chemical composition table of the low-silicon primary aluminum liquid is as follows: is based on
| Fe | Si | B | Zr | V+Ti+Mn+Cr | Al |
| 0.092 | 0.061 | 0.0005 | 0.0006 | 0.021 | 99.82 |
(2) Boronizing treatment: sampling and analyzing the components of the low-silicon primary aluminum liquid, and according to the mass percentage content C of V + Ti in the low-silicon primary aluminum liquidV+TiDetermining the mass percentage content C of the additive BBSo that C isV+Ti：CB1.6: 1; adding the metered aluminum-boron intermediate alloy into the chute in the process of adding the low-silicon primary aluminum liquid through the chuteFlushing with the low-silicon primary aluminum liquid, adding the low-silicon primary aluminum liquid into a melting and preserving furnace along with the low-silicon primary aluminum liquid, stirring for 9min, and then starting a boronization reaction to enable vanadium, titanium, manganese, chromium in the low-silicon primary aluminum liquid to react with boron to generate a boron-containing compound; the boronizing reaction temperature is 758 ℃, and the boronizing reaction time is 50 min;
refining at 758 deg.C for 37min, degassing, and removing impurities.
(3) Slagging off is carried out after refining, standing is carried out for 115min after slagging off, then sampling is carried out, detection and analysis are carried out on the components of the aluminum melt, and when the chemical components of the aluminum melt meet the following conditions: when the total weight of iron, titanium, manganese and chromium is 0.0037%, the furnace is turned down, the boron-containing compound precipitated at the bottom of the melting and retaining furnace is removed, and a low-vanadium and low-titanium aluminum melt is obtained; the amount of furnace transfer is 96 percent of the mass of the added low-silicon primary aluminum liquid.
(4) Adding Al-Zr intermediate alloy into the low-vanadium and low-titanium aluminum melt at the adding temperature of 768 ℃, adding the intermediate alloy twice because the quality of the low-vanadium and low-titanium aluminum melt cannot be accurately estimated after the low-vanadium and low-titanium aluminum melt is poured out of the furnace, and stirring, smelting and alloying to obtain the heat-resistant aluminum alloy melt with the zirconium content of 0.038 wt%; stirring and smelting for 25min after adding Al-Zr intermediate alloy for the first time, wherein the smelting temperature is 766 ℃, sampling and analyzing components, then calculating the total mass of the low-vanadium and low-titanium aluminum melt in a reverse manner, and then calculating the mass of the Al-Zr intermediate alloy added for the second time; adding Al-Zr intermediate alloy for the second time, stirring and smelting for 24min, wherein the smelting temperature is 764 ℃.
(5) After Al-Zr intermediate alloy is added and smelted, sampling and analyzing components, and obtaining the heat-resistant aluminum alloy rod material when the total amount of iron, titanium, manganese and chromium is 0.0037 wt.%, silicon is 0.061 wt.%, boron is 0.0011 wt.%, zirconium is 0.038 wt.%, and the balance is aluminum, and casting and rolling are performed without using an aluminum-titanium-boron wire refiner. And in the rolling process, the rolling process parameters are controlled by an online control method of the rolling process parameters.
The online control method of the rolling process parameters comprises the following steps: (1) calculating a theoretical finish rolling torque value; (2) adjusting rolling parameters on line; wherein,
(1) calculating a theoretical finish rolling torque value: according to the design and the required tensile strength and the corresponding relation between the finish rolling torque and the tensile strength: increasing the tensile strength along with the increase of the finish rolling torque, increasing the tensile strength by 1-2MPa every time the finish rolling torque is increased by 10 N.m, and measuring out the theoretical finish rolling torque value of the heat-resistant aluminum alloy rod material in advance; in this example, the tensile strength was designed and required to be 108MPa, and the relationship (Y) between the tensile strength and the finish rolling torque was determinedMPa＝0.125XN·m+63) calculating the theoretical finish rolling torque value of 360 N.m, wherein Y isMPaFor tensile strength, XN·mThe theoretical finishing rolling torque value is obtained.
(2) Adjusting rolling parameters on line: in the embodiment, in the initial rolling process of the heat-resistant aluminum alloy rod, the detected rolling process parameters are as follows:
pouring temperature: 710 ℃;
blank temperature: 550 ℃;
total pressure of cooling water: 380 Pa;
the water inlet temperature is as follows: 24 ℃;
speed of the crystallization wheel: 1.95 rpm;
finish rolling torque: 220 N.m
Emulsion temperature: 46 ℃;
the rod-out temperature: 115 ℃ is carried out.
Real-time online comparison is carried out on the actual finish rolling torque value and the theoretical finish rolling torque value in the rolling process, in the embodiment, the detected actual finish rolling torque value is 220 N.m, the actual finish rolling torque value is smaller than the theoretical finish rolling torque value, the speed of the crystallization wheel is firstly reduced, and when the speed of the crystallization wheel is reduced to 1.91 rpm; and the difference value between the theoretical finish rolling torque value and the actual finish rolling torque value is 5 N.m and not more than 15 N.m.
The corresponding relation between the finish rolling torque and the rotating speed of the crystallization wheel is as follows: the finish rolling torque is reduced with the increase of the rotation speed of the crystallization wheel, and the finish rolling torque is reduced by 30-50 N.m when the rotation speed of the crystallization wheel is increased by 0.01 rpm.
The corresponding relation between the finish rolling torque and the emulsion temperature is as follows: the finish rolling torque is reduced along with the increase of the emulsion temperature, and the finish rolling torque is reduced by 2-4 N.m when the emulsion temperature is increased by 1 ℃.
After the online adjustment, the present embodiment operates according to the following rolling process parameters:
pouring temperature: 710 ℃;
blank temperature: 550 ℃;
total pressure of cooling water: 380 Pa;
the water inlet temperature is as follows: 24 ℃;
speed of the crystallization wheel: 1.91 rpm;
finish rolling torque: 365 N.m
Emulsion temperature: 46 ℃;
the rod-out temperature: 115 ℃ is carried out.
The heat-resistant aluminum alloy rod material prepared by the embodiment comprises the following chemical components in percentage by mass: 0.092 percent of iron, 0.061 percent of silicon, 0.0011 percent of boron, 0.038 percent of zirconium, 0.0037 percent of the total mass of vanadium, titanium, manganese and chromium, and the balance of aluminum.
The heat-resistant aluminum alloy rod material prepared by the embodiment has the following properties:
| nominal diameter/mm | Tensile strength/MPa | Elongation/percent | Conductivity/% IACS |
| 9.5 | 108 | 17 | 63.5 |
The heat-resistant aluminum alloy conductor made by using the heat-resistant aluminum alloy rod of the embodiment has the following properties:
| heat resistance/% | Conductivity/% IACS | strength/MPa |
| 92 | 62.8 | 168 |
Example 4: the difference between this example and example 3 is that, during the rolling process, the rolling process parameters were not controlled by the online control method of the rolling process parameters of the present invention, and the same rolling process parameters during the initial rolling process of the heat-resistant aluminum alloy rod material as in example 3 were always used.
The heat-resistant aluminum alloy rod material prepared by the embodiment comprises the following chemical components in percentage by mass: 0.092 percent of iron, 0.061 percent of silicon, 0.0011 percent of boron, 0.038 percent of zirconium, 0.0037 percent of the total mass of vanadium, titanium, manganese and chromium, and the balance of aluminum.
The heat-resistant aluminum alloy rod material prepared by the embodiment has the following properties:
| nominal diameter/mm | Tensile strength/MPa | Elongation/percent | Conductivity/% IACS |
| 9.50 | 89 | 19 | 63.8 |
The heat-resistant aluminum alloy conductor made by using the heat-resistant aluminum alloy rod of the embodiment has the following properties:
| heat resistance/% | Conductivity/% IACS | strength/MPa |
| 92 | 63.2 | 149 |
Compared with the embodiment 3, the embodiment does not carry out on-line process parameter adjustment, although the conductivity is kept at a higher level, the strength of the heat-resistant aluminum alloy wire is lower than 159MPa, and the standard requirement is not met.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The method for adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod on line is characterized by comprising the following steps: (1) calculating a theoretical finish rolling torque value; (2) adjusting rolling parameters on line; wherein,
(1) calculating a theoretical finish rolling torque value: according to the designed and required tensile strength and the corresponding relation between the finish rolling torque and the tensile strength, the theoretical finish rolling torque value of the heat-resistant aluminum alloy rod is measured in advance;
(2) adjusting rolling parameters on line: and in the process of rolling the heat-resistant aluminum alloy rod, real-time online comparison is carried out on the actual finish rolling torque value and the theoretical finish rolling torque value in the rolling process, and when the absolute value of the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is larger than 15 N.m, the absolute value of the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is not larger than 15 N.m by adjusting the emulsion temperature and/or the crystallization wheel speed.
2. The method for on-line adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material as recited in claim 1, wherein the relationship between the finish rolling torque and the tensile strength is as follows:
YMPa＝0.125XN·m+63
wherein, YMPaFor tensile strength, XN·mThe theoretical finishing rolling torque value is obtained.
3. The method for on-line adjustment of rolling process parameters of a heat-resistant aluminum alloy rod according to claim 2, wherein when the actual finish rolling torque value is greater than the theoretical finish rolling torque value, the emulsion temperature is increased, and when the emulsion temperature reaches 60 ℃, the difference between the actual finish rolling torque value and the theoretical finish rolling torque value is still greater than 15N · m, and the crystallization wheel speed is increased so that the difference between the actual finish rolling torque value and the theoretical finish rolling torque value is not greater than 15N · m; or firstly increasing the speed of the crystallization wheel, and when the speed of the crystallization wheel reaches 2.0rpm, and the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is still larger than 15 N.m, increasing the temperature of the emulsion so that the difference value between the actual finish rolling torque value and the theoretical finish rolling torque value is not larger than 15 N.m.
4. The method for on-line adjustment of rolling process parameters of a heat-resistant aluminum alloy rod as recited in claim 2, wherein if the actual finish rolling torque value is less than the theoretical finish rolling torque value, the emulsion temperature is first decreased, and when the emulsion temperature is decreased to 30 ℃, the difference between the theoretical finish rolling torque value and the actual finish rolling torque value is still greater than 15N · m, the crystallization wheel speed is decreased so that the difference between the theoretical finish rolling torque value and the actual finish rolling torque value is not greater than 15N · m; or reducing the speed of the crystallization wheel, and when the speed of the crystallization wheel is reduced to 1.9rpm, and the difference value between the theoretical finishing rolling torque value and the actual finishing rolling torque value is still larger than 15 N.m, reducing the temperature of the emulsion so that the difference value between the theoretical finishing rolling torque value and the actual finishing rolling torque value is not larger than 15 N.m.
5. The method for on-line adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material according to any one of claims 1 to 4, wherein the corresponding relation between the finish rolling torque and the tensile strength is as follows: the tensile strength is increased with the increase of the finish rolling torque, and the tensile strength is increased by 1-2MPa when the finish rolling torque is increased by 10N m.
6. The method for on-line adjusting the rolling technological parameters of the heat-resistant aluminum alloy rod material according to any one of claims 1 to 4, wherein the corresponding relation between the finish rolling torque and the rotating speed of the crystallizing wheel is as follows: the finish rolling torque is reduced with the increase of the rotation speed of the crystallization wheel, and the finish rolling torque is reduced by 30-50 N.m when the rotation speed of the crystallization wheel is increased by 0.01 rpm.
7. The method for on-line adjustment of the rolling process parameters of the heat-resistant aluminum alloy rod material as recited in any one of claims 1 to 4, wherein the corresponding relation between the finish rolling torque and the emulsion temperature is as follows: the finish rolling torque is reduced along with the increase of the emulsion temperature, and the finish rolling torque is reduced by 2-4 N.m when the emulsion temperature is increased by 1 ℃.
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