CN116949257A - Online aerosol cooling structure of 7-series aluminum alloy profile and cooling method thereof - Google Patents
Online aerosol cooling structure of 7-series aluminum alloy profile and cooling method thereof Download PDFInfo
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- CN116949257A CN116949257A CN202310767692.1A CN202310767692A CN116949257A CN 116949257 A CN116949257 A CN 116949257A CN 202310767692 A CN202310767692 A CN 202310767692A CN 116949257 A CN116949257 A CN 116949257A
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- 238000001816 cooling Methods 0.000 title claims abstract description 137
- 239000000443 aerosol Substances 0.000 title claims abstract description 56
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 25
- 230000000171 quenching effect Effects 0.000 claims abstract description 48
- 238000010791 quenching Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002826 coolant Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 12
- 238000012795 verification Methods 0.000 claims description 11
- 238000009692 water atomization Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000003595 mist Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The application discloses an online aerosol cooling nozzle arrangement structure and method for 7-series aluminum alloy profiles. The nozzles of the structure are arranged along the circumferential direction of the cooled U-shaped section bar and the length direction of the section bar, the cooling medium is a mixture of normal-temperature water and gas, the sprayed gas fog coverage surface is approximately circular, the circumferential surface of the cooled U-shaped section bar can be completely covered by the cooling medium, and the whole temperature of the section bar is continuously reduced along with the movement of the cooled U-shaped section bar between each nozzle group along the extrusion direction and is cooled to the set temperature. The arrangement structure of the application reduces the non-uniformity of cooling of the profile in the online aerosol quenching process, improves the quenching quality, ensures the online quenching efficiency of the profile and the cooling uniformity in the quenching process, avoids the problems of bending, deformation and the like in the online quenching process caused by the non-uniformity of cooling, improves the working efficiency and the quenching quality of the online aerosol quenching, and saves the time spent in the subsequent process.
Description
Technical Field
The application belongs to the field of online quenching equipment for aluminum alloy sections, and relates to an online aerosol cooling structure for a 7-series aluminum alloy section and a cooling method thereof.
Background
Aluminum alloy is a relatively low cost, lightweight metallic material that can be heat treated and subjected to relatively high stresses, and is one of the most readily produced high performance materials. The 7-series aluminum alloy is the most widely applied super-hard aluminum, and is commonly used for manufacturing large structural parts needing bearing force due to the excellent mechanical property. Along with the continuous development of social productivity, the 7-series aluminum alloy not only plays an important role in the field of aerospace industry, but also has increasingly increased application in the mechanical manufacturing industries of electric power, light industry, automobiles and the like, and the application of 7-series aluminum alloy materials and the production of high-strength, high-toughness and high-quality 7-series aluminum alloy products are continuously developed.
The online quenching technology of the aluminum alloy profile is that the profile is directly quenched by utilizing extrusion waste heat after being extruded from a die, compared with offline quenching, the online quenching omits the process of reheating the profile in a quenching furnace to reach the solid solution temperature of the profile, greatly improves the production efficiency, saves the energy consumption, and has been widely applied to the actual production of the extruded aluminum alloy profile.
For special-shaped aluminum alloy sections, due to the factors of inconsistent wall thickness, asymmetric structure, open structure and the like, the problems of serious cooling bending or deformation easily exist after online gas spray or water cooling quenching by extrusion, the plane gap or contour precision requirement of products cannot be guaranteed, even scratch and scratch between the aluminum alloy sections and online quenching equipment occur, the product quality and the production efficiency are restricted, in the process of gas spray quenching of the sections, the arrangement of nozzles for online quenching of the sections and the regulation of gas-water ratio of different nozzles are key factors for determining the online gas spray quenching effect of the sections.
Disclosure of Invention
Aiming at a 7-series aluminum alloy section, the application provides a scheme for the arrangement of nozzles for on-line aerosol quenching and the cooling rate and cooling uniformity of the section, so as to solve the problems of deformation, bending and the like of the section caused by uneven cooling in the on-line aerosol quenching process, and has good engineering practicability.
The technical scheme of the application is as follows: an online aerosol cooling structure of 7-series aluminum alloy section bar, the aerosol cooling structure includes:
the gas mist cooling unit is arranged along the circumferential direction of the cooled U-shaped section and the length direction of the section and is used for spraying cooling medium and forming uniformly distributed gas mist covering layers on the surface of the cooled U-shaped section to finish cooling the section;
the lifting unit is connected with the aerosol cooling unit and used for adjusting the distance between the aerosol cooling unit and the cooled U-shaped profile;
the angle adjusting unit is connected with the aerosol cooling unit and is used for adjusting the angle between the central line of the aerosol cooling unit and the cooled U-shaped section;
the temperature measuring unit is used for collecting the temperature of the cooled U-shaped section in real time and transmitting temperature data to the control unit,
the control calculation unit is used for calculating cooling control parameters according to requirements, sending the obtained cooling control parameters to the aerosol cooling unit, the lifting unit and the angle adjustment unit for execution, and adjusting the cooling control parameters according to feedback of the temperature measurement unit;
the aerial fog cooling unit is arranged on the support through the lifting unit and the angle adjusting unit, and the temperature measuring unit is arranged on the support at the discharge hole and is connected with the control computing unit.
Further, the aerosol cooling unit is a plurality of groups of air-water atomizing nozzles, the number of each group of air-water atomizing nozzles is 4-6, and each group of air-water atomizing nozzles is arranged at equal intervals L1 along the length direction of the cooled U-shaped section.
Further, the flow rate adjustment range of each air-water atomizing nozzle is 0.012 kg/s-0.13 kg/s, the air pressure adjustment range is 0.1 MPa-0.45 MPa, and each air-water atomizing nozzle isInjection angle alpha of individual nozzles 2 =20 to 32 °; each nozzle has a height h=100-200 mm from the profile surface; the included angle alpha between the central line of each nozzle cooling medium injection and the direction reverse to the running direction of the section bar 1 ＝75～90°
The cooling medium is a mixture of warm water and air.
Further, when the number of nozzles of each group of the aerosol-cooling units is 6, the arrangement mode is as follows: wherein 4 nozzles are symmetrically arranged at the left end and the right end of the cooled U-shaped section bar in pairs; and the distance between two nozzles at each end is l2=40 mm-60 mm;
the other 2 nozzles are symmetrically arranged at the upper end and the lower end of the section to be formed.
Further, when the number of nozzles of each group of the aerosol-cooling units is 5, the arrangement manner is as follows: wherein 3 nozzles are respectively arranged on the central lines of the left end, the right end and the lower end of the cooled U-shaped section bar;
in addition, 2 nozzles are arranged at two sides of the central line of the upper end of the section bar in a mirror image mode, and the included angle between the central line of the nozzles and the central line of the upper end of the section bar is 10-25 degrees.
Further, when the number of nozzles of each group of the aerosol-cooling units is 4, the arrangement manner is as follows: the 4 nozzles are respectively arranged on the central lines of the left end, the right end, the upper end and the lower end of the cooled U-shaped section.
Further, the water flow and the working air pressure of the nozzle at the lower end of the cooled U-shaped section are 1.25 times that of the nozzle at the upper end of the cooled U-shaped section.
The water flow and working air pressure of the other nozzles are the same as those of the nozzle positioned at the upper end of the cooled U-shaped section.
The application also provides a cooling control method of the online aerosol cooling structure of the profile, which comprises the following steps:
s1) firstly, calculating the number of cooling nozzles, the spacing between the nozzles, the injection angle, the distance between the nozzles and the surface of the profile, the injection incidence angle, the spacing between each group of nozzles and the number of groups of nozzles along the length direction of the profile according to the size of the profile to be cooled and the cooling process requirement, and inputting the number of the cooling nozzles, the spacing between the nozzles, the injection angle, the distance between each group of nozzles and the surface of the profile into a control unit;
s2) inverting the U-shaped opening of the profile to be cooled down on a driving roller, opening each group of nozzles simultaneously after the profile enters a quenching zone according to a set rate, enabling a cooling medium sprayed by each aerosol nozzle to completely cover the circumferential surface of the profile, and continuously carrying out aerosol quenching cooling on the length direction of the profile by each group of circumferential cooling nozzles arranged in the length direction of the profile along with the forward movement of the profile;
s3) when the temperature detector unit detects that the overall highest temperature of the profile is lower than 50 ℃, all the nozzles stop spraying and cooling the profile simultaneously, and the profile moves out of the quenching zone along with the driving roller
Further, the step S1) specifically comprises the following steps:
s1.1) acquiring parameters required by a cooling process and the size of a section to be cooled;
s1.2) inputting the parameters into a verification formula for verification, and if the parameters are satisfied, storing the parameters as cooling parameters; if not, the parameters are adjusted and then verification is performed again;
s1.3) sends parameters meeting the requirements to the respective units.
Further, the step S1) specifically comprises the following steps: the following verification formula (1) is described as follows:
the S1) comprises the following specific steps: the cooling parameter is calculated by the following formula (1), which is shown as follows:
wherein n is the number of circumferential nozzles of the profile, n=4 to 6, v is the running speed of the profile, alpha 1 The included angle between the ejection direction of the aerosol nozzle and the horizontal plane of the cooled surface of the U-shaped section bar is h, the heat exchange coefficient of the surface of the U-shaped section bar is alpha 2 Is the injection included angle of the nozzle; omega is the density of the water flow,q is the water flow of the nozzle and H is the nozzle distanceThe surface distance of the U-shaped section bar;
the number of nozzle groups a satisfies the following formula:
wherein L is 1 For each set of nozzle spacing, s is the maximum wall thickness of the U-profile.
Further, the temperature of the profile after on-line aerosol quenching cooling should be controlled below 50 ℃.
The beneficial effects of the application are as follows: by adopting the technical scheme, the U-shaped opening of the profile is downwards placed on the driving roller, and parameters such as the number of the aerosol cooling nozzles, the spacing of the nozzles, the spraying angle, the distance between the profile and the surface of the profile, the spraying incidence angle, the spacing of each group of nozzles along the length direction of the profile and the like are reasonably arranged in the circumferential direction of the section of the profile, so that the profile is completely covered by on-line aerosol quenching, the uniformity of the temperature of the profile in the on-line aerosol quenching process is ensured, the cooling rate of the profile exceeds the critical cooling rate (4 ℃/s) of the profile, the proper straightening temperature (below 50 ℃) is achieved after quenching, the problems of serious bending of the profile due to uneven cooling are avoided, the production efficiency and the quality of the profile are greatly improved, and the profile has good economic and social benefits.
Drawings
FIG. 1 is a schematic structural view of an online aerosol cooling nozzle arrangement structure of a 7-series aluminum alloy profile of the present application;
FIG. 2 is a schematic diagram of the arrangement structure of the on-line aerosol cooling nozzles of the 7-series aluminum alloy section bar of the application in six nozzle arrangement in the circumferential direction of the section bar;
FIG. 3 is a schematic diagram of an online aerosol cooling nozzle arrangement structure of a 7-series aluminum alloy section bar in five nozzle arrangements in the circumferential direction of the section bar;
FIG. 4 is a schematic diagram of an online aerosol cooling nozzle arrangement structure of a 7-series aluminum alloy section bar in four nozzle arrangements in the circumferential direction of the section bar;
fig. 5 is a schematic view of the spray angle of the nozzle according to the present application.
In the figure:
1-a section bar extruder; 2-section bar; 3-driving rollers; 4-a temperature measurement unit; 5-an aerosol cooling unit; 6-a first nozzle; 7-a second nozzle; 8-a third nozzle; 9-fourth nozzles; 10-a fifth nozzle; 11-sixth nozzles; 12-a control calculation unit; 13-lifting unit, 14-angle adjusting unit, 15-bracket.
Detailed Description
The present application will be described in further detail with reference to the following examples and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and that the words "above," "below," and the like indicating orientations and positions in the embodiments are merely for purposes of illustration of the positional relationship in the drawings, and are not intended to indicate or imply that the structures to which the application is directed must have a particular orientation or be constructed and operated in a particular orientation, and are not intended to limit the application.
As shown in fig. 1, the present application provides an online aerosol cooling structure for a 7-series aluminum alloy profile, which comprises:
the gas mist cooling units 5 are arranged along the circumferential direction of the section bar and the length direction of the section bar and are used for spraying cooling medium and forming uniformly distributed gas mist covering layers on the surface of the section bar so as to finish cooling the section bar;
the lifting unit 13 is connected with the aerosol cooling unit and is used for adjusting the distance between the aerosol cooling unit and the cooled profile;
an angle adjustment unit 14 connected to the aerosol-cooling unit for adjusting an angle between a center line of the aerosol-cooling unit and a cooled profile;
a temperature measuring unit 4 for collecting the temperature of the cooled profile in real time and transmitting the temperature data to the control unit,
a control calculation unit 12, configured to calculate a cooling control parameter according to a requirement, send the obtained cooling control parameter to the aerosol cooling unit, the lifting unit, and the angle adjustment unit for execution, and adjust the cooling control parameter according to feedback from the temperature measurement unit;
wherein, the aerosol cooling unit 5 is installed on a bracket 15 through the lifting unit 13 and the angle adjusting unit 14, and the temperature measuring unit 4 is arranged on the bracket 15 at the discharge hole and is connected with the control calculating unit 12.
The gas mist cooling unit 5 is a plurality of groups of gas-water atomizing nozzles, the number of each group of gas-water atomizing nozzles is 4-6, and each group of gas-water atomizing nozzles is arranged at equal intervals L1 along the length direction of the section to be cooled.
The flow regulation range of each air-water atomizing nozzle is 0.012 kg/s-0.13 kg/s, the air pressure regulation range is 0.1 MPa-0.45 MPa, and the spraying angle alpha of each nozzle 2 =20 to 32 °; each nozzle has a height h=100-200 mm from the profile surface; the included angle alpha between the central line of each nozzle cooling medium injection and the direction reverse to the running direction of the section bar 1 =75 to 90 °, as shown in fig. 5.
The cooling medium is a mixture of warm water and air.
As shown in fig. 2, when the number of nozzles of each group of the aerosol-cooling units is 6, the arrangement manner is as follows: wherein 4 nozzles are symmetrically arranged at the left end and the right end of the section bar to be treated; and the distance between two nozzles at each end is l2=40 mm-60 mm;
the other 2 are symmetrically arranged at the upper end and the lower end of the section bar to be formed.
As shown in fig. 3, when the number of nozzles of each group of the aerosol-cooling units is 5, the arrangement manner is as follows: wherein 3 nozzles are respectively arranged on the central lines of the left end, the right end and the lower end of the cooled U-shaped section bar;
in addition, 2 nozzles are arranged at two sides of the central line of the upper end of the section bar in a mirror image mode, and the included angle between the central line of the nozzles and the central line of the upper end of the section bar is 10-25 degrees.
As shown in fig. 4, when the number of nozzles of each group of the aerosol-cooling units is 4, the arrangement is as follows: the 4 nozzles are respectively arranged on the central lines of the left end, the right end, the upper end and the lower end of the cooled U-shaped section.
The water flow and working air pressure of the nozzle at the lower end of the cooled U-shaped section are 1.25 times that of the nozzle at the upper end of the cooled U-shaped section.
The water flow and working air pressure of the other nozzles are the same as those of the nozzle positioned at the upper end of the cooled U-shaped section.
The cooling control method adopting the profile online aerosol cooling structure specifically comprises the following steps:
s1) firstly, calculating the number of cooling nozzles, the spacing between the nozzles, the injection angle, the distance between the nozzles and the surface of the profile, the injection incidence angle, the spacing between each group of nozzles and the number of groups of nozzles along the length direction of the profile according to the size of the profile to be cooled and the cooling process requirement, and inputting the number of the cooling nozzles, the spacing between the nozzles, the injection angle, the distance between each group of nozzles and the surface of the profile into a control unit;
s2) inverting the U-shaped opening of the profile to be cooled down on a driving roller, opening each group of nozzles simultaneously after the profile enters a quenching zone according to a set rate, enabling a cooling medium sprayed by each aerosol nozzle to completely cover the circumferential surface of the profile, and continuously carrying out aerosol quenching cooling on the length direction of the profile by each group of circumferential cooling nozzles arranged in the length direction of the profile along with the forward movement of the profile;
s3) when the temperature detector unit detects that the overall highest temperature of the profile is lower than 50 ℃, all the nozzles stop spraying and cooling the profile simultaneously, and the profile moves out of the quenching zone along with the driving roller
The S1) comprises the following specific steps:
s1.1) acquiring parameters required by a cooling process and the size of a section to be cooled;
s1.2) inputting the parameters into a verification formula for verification, and if the parameters are satisfied, storing the parameters as cooling parameters; if not, the parameters are adjusted and then verification is performed again;
s1.3) sends parameters meeting the requirements to the respective units.
The S1) comprises the following specific steps: the following verification formula (1) is described as follows:
the S1) comprises the following specific steps: the cooling parameter is calculated by the following formula (1), which is shown as follows:
wherein n is the number of circumferential nozzles of the U-shaped section, n=4 to 6, v is the section running speed, alpha 1 The included angle between the ejection direction of the aerosol nozzle and the horizontal plane of the cooled surface of the U-shaped section bar is h, the heat exchange coefficient of the surface of the U-shaped section bar is alpha 2 Is the injection included angle of the nozzle; omega is the density of the water flow,q is the water flow of the nozzle, and the distance between the H nozzle and the surface of the U-shaped section bar;
the number of nozzle groups a satisfies the following formula:
wherein L is 1 For each set of nozzle spacing, s is the maximum wall thickness of the U-profile.
In the production process of the extruded aluminum alloy section, after the aluminum bar is molded by a die to produce the corresponding aluminum alloy section, the aluminum bar enters a quenching area to be subjected to online aerosol quenching cooling, and the cooling speed of the section exceeds the critical cooling speed of the section material so that the section reaches the required mechanical property and reaches the proper straightening temperature after the section is discharged from the quenching area.
In the production process, the U-shaped opening of the section bar is downwards inverted on the driving roller, so that the accumulation of cooling water in the section bar can be reduced, and the influence on the subsequent straightening process is avoided.
According to the size of the section bar and the cooling process requirement, parameters such as the number of cooling nozzles, the spacing between the nozzles, the spraying angle, the distance between the cooling nozzles and the surface of the section bar, the spraying incidence angle, the spacing between each group of nozzles along the length direction of the section bar and the number of groups are calculated through a formula, and whether the parameter settings are proper or not is verified through a simulation and analog calculation method.
After the profile enters the quenching zone, all groups of nozzles in the circumferential direction of the profile are simultaneously opened, and the cooling medium sprayed by all the aerosol nozzles can completely cover the circumferential surface of the profile.
Simultaneously, along with the profile moving forwards, each group of circumferential cooling nozzles arranged in the length direction of the profile can continuously perform aerosol quenching cooling on the length direction of the profile, and when the temperature detector measures that the overall highest temperature of the profile is lower than 50 ℃, each nozzle stops spraying and stops cooling the profile at the same time, and the profile moves out of a quenching zone along with a driving roller.
Example 1: the profile 2 extruded by the profile extruder 1 is conveyed into a quenching zone through a driving roller 3, a control calculation unit 12 calculates cooling parameters according to the requirements of the profile to be cooled, a profile length direction nozzle group is arranged in the quenching zone according to the cooling parameters, all aerosol cooling nozzle groups are controlled to be opened simultaneously, each group of nozzles comprises four nozzles, the nozzle group interval is 120mm, 18 groups of nozzles are total, the distance between each circumferential nozzle and the surface of the profile is 150mm, and the included angle between the central line of cooling medium injection and the reverse direction of the running direction of the profile is 85 degrees. Thus, when the profile was fed forward at a horizontal speed of 30mm/s, the water flows of the profile circumferential cooling first nozzle 6, third nozzle 8, fourth nozzle 9 and fifth nozzle 10 were 0.05kg/s, 0.0625kg/s and 0.05kg/s, respectively, and the working pressures were 0.3MPa, 0.38MPa and 0.3MPa, respectively. The average temperature of the profile after exiting the quenching zone is 40.2 ℃, the online quenching time is 67.6s, the overall cooling rate of the profile is 6.4 ℃/s, and the quality of the profile meets the requirements.
Example 2: the extruded profile is conveyed into a quenching area through a driving roller, all the aerosol cooling nozzle groups are simultaneously opened, each group of nozzles comprises five nozzles, the nozzle group interval is 200mm, 10 groups of nozzles are altogether, and all the nozzles in the circumferential direction vertically spray the surface of the profile. Thus, when the profile was fed forward at a horizontal speed of 25mm/s, the nozzle water flows of the profile circumferential cooling first nozzle 6, the second nozzle 7, the third nozzle 8 and the fourth nozzle 9 were 0.04kg/s, 0.04kg/s and 0.05kg/s, respectively, and the working air pressures were 0.25MPa, 0.25MPa and 0.32MPa, respectively. The average temperature of the profile after exiting the quenching zone is 35.8 ℃, the online quenching time is 60.1s, and the overall cooling rate of the profile is 7.1 ℃/s.
Example 3: the extruded profile is conveyed into a quenching zone through a driving roller, all the aerosol cooling nozzle groups are simultaneously opened, each group of nozzles comprises six nozzles, the interval between the nozzle groups is 150mm, and 14 groups of nozzles are all perpendicular to the surface of the profile. Thus, when the profile was fed forward at a horizontal speed of 30mm/s, the water flows of the profile circumferential cooling first nozzle 6, the second nozzle 7, the third nozzle 8 and the fourth nozzle 9 were 0.065kg/s, 0.065kg/s and 0.81kg/s, respectively, and the working pressures were 0.3MPa, 0.3MPa and 0.38MPa, respectively. The average temperature of the profile after exiting the quenching zone is 31.6 ℃, the online quenching time is 49.8s, and the overall cooling rate of the profile is 8.8 ℃/s.
The embodiment of the application provides an arrangement structure and a method of an online aerosol cooling nozzle for a 7-series aluminum alloy profile, which are described in detail. The above description of embodiments is only for aiding in the understanding of the method of the present application and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a preset error range, substantially achieving the technical effect. The description hereinafter sets forth a preferred embodiment for practicing the application, but is not intended to limit the scope of the application, as the description is given for the purpose of illustrating the general principles of the application. The scope of the application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, either as a result of the foregoing teachings or as a result of the knowledge or technology of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the application are intended to be within the scope of the appended claims.
Claims (10)
1. An online aerial fog cooling structure of 7 series aluminum alloy section bar, its characterized in that, this aerial fog cooling structure includes:
the aerosol cooling units are arranged along the circumferential direction and the length direction of the cooled U-shaped section and are used for spraying cooling medium and forming an aerosol covering layer uniformly distributed on the surface of the cooled section so as to finish cooling the cooled section;
the lifting unit is connected with the aerosol cooling unit and used for adjusting the distance between the aerosol cooling unit and the cooled U-shaped profile;
the angle adjusting unit is connected with the aerosol cooling unit and is used for adjusting the angle between the central line of the aerosol cooling unit and the cooled U-shaped section;
the temperature measuring unit is used for collecting the real-time temperature of the cooled U-shaped section in real time;
the control calculation unit is used for calculating cooling control parameters according to requirements, sending the obtained cooling control parameters to the aerosol cooling unit, the lifting unit and the angle adjustment unit for execution, and adjusting the cooling control parameters according to feedback of the temperature measurement unit;
the aerial fog cooling unit is arranged on the support through the lifting unit and the angle adjusting unit, and the temperature measuring unit is arranged on the support at the discharge hole and is connected with the control computing unit.
2. The aerosol-cooling structure according to claim 1, wherein the aerosol-cooling unit is a plurality of groups of the aerosol-forming nozzles, the number of each group of the aerosol-forming nozzles is 4 to 6, and each group of the aerosol-forming nozzles is arranged at equal intervals L1 along the length direction of the profile to be cooled.
3. An aerosol-cooling structure according to claim 2, wherein the flow rate adjustment range of each of the aerosol-water atomizing nozzles is 0.012kg/s to 0.13kg/s, the air pressure adjustment range is 0.1MPa to 0.45MPa, and the ejection angle α of each nozzle is 2 =20 to 32 °; the height H=100-200 mm of each nozzle from the surface of the U-shaped section bar; the included angle alpha between the central line of each nozzle cooling medium injection and the running direction of the U-shaped section bar 1 ＝75～90°；
The cooling medium is a mixture of warm water and air.
4. An aerosol-cooling structure according to claim 3, wherein when the number of nozzles per set of the aerosol-cooling units is 6, the arrangement is as follows: wherein 4 nozzles are symmetrically arranged at the left end and the right end of the cooled U-shaped section bar in pairs; and the distance between two nozzles at each end is l2=40 mm-60 mm;
the other 2 nozzles are symmetrically arranged at the upper end and the lower end of the cooled U-shaped section bar.
5. An aerosol-cooling structure according to claim 3, wherein: when the number of the nozzles of each group of the aerosol-cooling units is 5, the arrangement mode is as follows: wherein 3 nozzles are respectively arranged on the central lines of the left end, the right end and the lower end of the cooled U-shaped section bar;
in addition, 2 nozzles are arranged at two sides of the central line of the upper end of the section bar in a mirror image mode, and an included angle alpha is formed between the central line of the nozzles and the central line of the upper end of the section bar 3 Is 10-25 degrees.
6. An aerosol-cooling structure according to claim 3, wherein: when the number of the nozzles of each group of the aerosol-cooling units is 4, the arrangement mode is as follows: the 4 nozzles are respectively arranged on the central lines of the left end, the right end, the upper end and the lower end of the cooled U-shaped section.
7. An aerosol-cooling structure according to any one of claims 4 to 6, wherein: the water flow and the working air pressure of the nozzle positioned at the lower end of the cooled U-shaped section bar are 1.25 times that of the nozzle positioned at the upper end of the cooled U-shaped section bar;
the water flow and working air pressure of the other nozzles are the same as those of the nozzle positioned at the upper end of the cooled U-shaped section.
8. A cooling control method using the profile online aerosol cooling structure as claimed in any one of claims 1 to 6, characterized in that the control method specifically comprises the following steps:
s1) calculating the number of cooling nozzles, the spacing between the nozzles, the injection angle, the distance between the nozzle and the surface of the profile, the injection incidence angle and the spacing and the number of groups of the nozzles in each group along the length direction of the profile according to the size of the cooled U-shaped profile and the cooling process requirement, and inputting the calculated number of cooling nozzles, the spacing, the injection angle and the spacing and the number of groups of the nozzles in each group into a control unit;
s2) inverting the U-shaped opening of the cooled profile on a driving roller downwards, opening each group of nozzles simultaneously after the profile enters a quenching zone according to a set rate, enabling a cooling medium sprayed by each aerosol nozzle to completely cover the circumferential surface of the profile, and continuously carrying out aerosol quenching cooling on the length direction of the profile by each group of circumferential cooling nozzles arranged in the length direction of the profile along with the forward movement of the profile;
and S3) when the temperature detector unit detects that the overall highest temperature of the profile is lower than 50 ℃, each nozzle stops spraying and cooling the profile simultaneously, and the profile moves out of the quenching area along with the driving roller.
9. The cooling control method according to claim 8, characterized in that: the S1) comprises the following specific steps:
s1.1) acquiring parameters required by the cooling process of the size of the cooled U-shaped section;
s1.2) inputting the parameters into a verification formula for verification, and if the parameters are satisfied, storing the parameters as cooling parameters; if not, the parameters are adjusted and then verification is performed again;
s1.3) sends parameters meeting the requirements to the respective units.
10. The cooling control method according to claim 9, characterized in that: the S1) comprises the following specific steps: the cooling parameter is calculated by the following formula (1), which is shown as follows:
wherein n is the number of circumferential nozzles of the profile, n=4 to 6, v is the running speed of the profile, alpha 1 The included angle between the ejection direction of the aerosol nozzle and the horizontal plane of the cooled surface of the U-shaped section bar is h, the heat exchange coefficient of the surface of the U-shaped section bar is alpha 2 Is the injection included angle of the nozzle; omega is the density of the water flow,q is the water flow of the nozzle, and H nozzle is separated from U-shaped section meterA face distance;
the number of nozzle groups a satisfies the following formula:
wherein L is 1 For each set of nozzle spacing, s is the maximum wall thickness of the U-profile.
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