CN109576619B - Heat treatment process of 5505 aluminum alloy for mirror surface oxidation - Google Patents
Heat treatment process of 5505 aluminum alloy for mirror surface oxidation Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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Abstract
The invention relates to a heat treatment process of 5505 aluminum alloy for mirror surface oxidation. A heat treatment process of 5505 aluminum alloy for mirror surface oxidation comprises the homogenization heat treatment of 5505 aluminum alloy semi-finished products for cold rolling mirror surface oxidation and the stabilization heat treatment of 5505 aluminum alloy finished products for cold rolling mirror surface oxidation; the homogenization heat treatment comprises the following steps: rapidly heating the 5505 aluminum alloy semi-finished product for cold rolling mirror surface oxidation to 260 +/-5 ℃, preserving heat for 5 hours, and then cooling by air; the stabilizing heat treatment comprises the following steps: and (3) quickly heating the finished product of the cold-rolled mirror surface oxidation 5505 aluminum alloy to 270 +/-5 ℃, preserving heat for 8 hours, and then cooling by air. The heat treatment process of 5505 aluminum alloy for mirror surface oxidation is suitable for heat treatment of semi-finished products and finished products of hot rolled blanks provided by a single-stand hot rolling mill after deep processing, can effectively and stably improve the forming capability of the products to the level completely consistent with foreign similar products, and has the characteristics of low heat treatment cost and small difficulty in stabilizing and controlling the heat treatment process.
Description
Technical Field
The invention belongs to the field of aluminum alloy materials, and particularly relates to a heat treatment process of 5505 aluminum alloy for mirror surface oxidation.
Background
The 5505 aluminum alloy for mirror surface oxidation mainly has two use states of H24 and H26 according to the difference of requirements on oxidation forming capability by taking BSEN 573-3-2009 as a component control standard, has the characteristics of high forming capability, good oxidation uniformity and high oxidation brightness, and is widely applied to the fields of public transportation such as airplanes, automobiles, trains and the like and hardware decoration. Since the beginning of this century, the product is widely used in vehicles such as automobiles and trains in developed countries such as North America and Europe, and in the industrial change of about 2008, along with the output of the oxidation treatment process, 5505 aluminum alloy is purchased or entrusted to be processed from the original places of aluminum alloy such as America and Sweden by the trade means, and is rapidly applied to the mirror oxidation and hardware decoration fields of domestic produced foreign vehicles, joint-procurement vehicles and high-end domestic vehicles, the only product which is close to the process and functional usage of the product at present internationally is that only 5657 aluminum alloy for mirror oxidation and 1085 aluminum alloy for mirror oxidation are provided, but as far as the core technology and product market of 5657 and 1085 mirror aluminum are provided by German aluminium, American aluminium and Kenjian, and the like, and several international large-head companies are monopolized, and the research and marketing aspects on the product at home, except for the Sinkiang and the company Limited, other domestic manufacturers or research institutes do not have the core product technology for solving the mutual influence of the 5505 alloy for mirror surface oxidation in the five aspects of 'plate ingot casting, hot processing technology, heat treatment technology, surface control technology and mirror surface processing technology'.
The heat treatment technology of 5505 for mirror surface oxidation mature abroad is based on a series of processed blanks of hot rolled blanks provided by a '1 + 3' hot continuous rolling mill, adopts a heat treatment mode of directly carrying out homogenization annealing (nitrogen or vacuum protection) on hot rolled finished products and carrying out low-temperature long-time annealing (nitrogen protection) on mirror surface rolled finished products, has the characteristics of large equipment investment, high process control difficulty and poor equipment universality, and does not have a heat treatment technology which is similar to or can be used for producing 5505 aluminum alloy for mirror surface oxidation in any aluminum processing enterprise or research unit in China.
In view of the above, the present invention provides a heat treatment process of 5505 aluminum alloy for mirror surface oxidation.
Disclosure of Invention
The invention aims to provide a heat treatment process of 5505 aluminum alloy for mirror surface oxidation, which is matched with a developed special hot working process (aging process), has good forming capability, can effectively and stably improve the forming capability of a product to a level completely consistent with foreign like products, has strong equipment universality and can be completed by common equipment.
In order to realize the purpose, the adopted technical scheme is as follows:
a heat treatment process of 5505 aluminum alloy for mirror surface oxidation comprises the homogenization heat treatment of 5505 aluminum alloy semi-finished products for cold rolling mirror surface oxidation and the stabilization heat treatment of 5505 aluminum alloy finished products for cold rolling mirror surface oxidation;
the homogenization heat treatment comprises the following steps: rapidly heating the cleaned 5505 aluminum alloy semi-finished product for cold rolling mirror surface oxidation to 260 +/-5 ℃, preserving heat for 5 hours, air-cooling and then carrying out deep processing;
the stabilizing heat treatment comprises the following steps: and (3) quickly heating the cleaned 5505 aluminum alloy finished product for cold rolling mirror surface oxidation to 270 +/-5 ℃, preserving heat for 8 hours, and then cooling by air.
Further, in the homogenizing heat treatment process: the thickness of the 5505 aluminum alloy semi-finished product for cold rolling mirror surface oxidation is not less than 3 mm.
Further, in the homogenizing heat treatment process: and air cooling is carried out until the temperature of the semi-finished product is not more than 150 ℃.
Further, in the homogenizing heat treatment process: the temperature rise process is not more than 160min, and the air cooling time is not more than 40 min.
Further, the air is cooled until the temperature of the semi-finished product is 60-70 ℃.
Further, in the stabilizing heat treatment process: the thickness of the 5505 aluminum alloy finished product for cold rolling mirror surface oxidation is not more than 1.2 mm.
Further, in the stabilizing heat treatment process: the temperature rise process does not exceed 160 min.
Further, in the stabilizing heat treatment process: and air cooling is carried out until the temperature of the finished product is not more than 150 ℃.
Further, in the stabilizing heat treatment process: the air cooling time is not more than 40 min.
Further, the air is cooled until the temperature of the finished product is 60-70 ℃.
Compared with the prior art, the invention has the advantages that:
1. the heat treatment process provided by the invention has the advantages that while the composition homogenization fluctuation possibly induced by the 5-series aluminum alloy when a single-stand hot rolling mill is used as a main processing device is stably balanced, the homogenization and stabilization heat treatment process which is characterized by ultralow temperature for a long time is adopted, the process detail control is reasonable and controllable, the production process and the product characteristics are stable, and the heat treatment process is suitable for industrial production of high-end oxidation 5-series aluminum alloy.
2. The heat treatment process adopts the process principle of integrated design of the ultra-low temperature heat treatment process and the heat processing aging treatment process, stably solves the inherent defects of high-energy control and homogenization control of the structure of a single-stand hot rolling mill in the processing of the aluminum alloy for the 5-series mirror surface, and the method and the principle of the integrated design never have similar or communicated reports in any aluminum processing enterprises or research units.
3. The heat treatment process adopts a method of 'ultra-low temperature heat treatment and hot rolling aging process integrated design', one of design bases is the aging process of forcibly blocking a hot-processed finished product, and adopts the heat treatment process of ultra-low temperature homogenization and stabilization, so that the tissue homogenization control is stably realized, and simultaneously, the material is ensured to have the characteristics of high strength and high elongation.
4. Compared with foreign heat treatment processes, the heat treatment process has the obvious characteristics that annealing is carried out without using nitrogen or under vacuum protection, but the air annealing furnace which is the longest used common aluminum alloy is directly used for carrying out product heat treatment, and has the characteristics of low heat treatment cost and small difficulty in stabilizing and controlling the heat treatment process.
5. The heat treatment process provided by the invention is matched with a developed special hot working process (aging process), can effectively and stably improve the forming capability of the product to a level completely consistent with that of the similar products abroad, and is suitable for heat treatment of semi-finished products and finished products of hot rolled blanks provided by a single-stand hot rolling mill after deep processing.
6. The heat treatment process has the characteristics of simple process control and equipment requirement for realizing industrial production, low equipment investment, strong equipment universality and small process management difficulty, and the formed economic benefit is direct and obvious.
Detailed Description
In order to further illustrate the heat treatment process of 5505 aluminum alloy for mirror oxidation of the present invention, which achieves the desired objects, the following embodiments, structures, features and effects thereof will be described in detail with reference to the accompanying drawings. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Before describing in detail the heat treatment process of 5505 aluminum alloys for mirror oxidation according to the present invention, it is necessary to further describe the methods mentioned in the present invention, etc. for achieving better results.
The related key technology is as follows:
(1) technical route of 5505 alloy for mirror surface oxidation
The technical route of 5505 aluminum alloy for mirror surface oxidation, which is mature abroad and takes a hot continuous rolling mill as key equipment, is as follows:
a. typical technical route of 5505 aluminum alloy for mirror surface oxidation
The 5505 products for mirror oxidation have different processing technical details and emphasis points due to different final states, but the technical route of 5505 aluminum alloys for mirror oxidation is consistent regardless of the final state of the products as a whole: the method comprises nine major links, namely slab ingot casting, slab ingot homogenization and hot working, coiled material heat treatment (homogenization heat treatment), slab ingot cold working, coiled material mirror finishing, coiled material cleaning, coiled material heat treatment (stabilization heat treatment), plate opening and forming, mirror surface oxidation and the like, wherein the technical core of the whole industry is focused on five core links, namely casting technology, hot working technology, surface control, slab ingot heat treatment technology, mirror surface processing and the like, and particularly, the typical technical route of 5505 aluminum alloy products for mirror surface oxidation is as follows:
slab ingot casting → → slab ingot sawing and milling surface → → slab ingot homogenization → → hot working → → heat treatment → cold rolling → → mirror surface working → → cleaning → → type of edition pulling → → heat treatment → → open plate molding → → mirror surface oxidation → → finished product;
b. 5505 aluminum alloy core quality and influence factors for mirror surface oxidation
The 5505 aluminum alloy product for mirror surface oxidation has two clear technical indexes and a core quality requirement, and the two core technical indexes are as follows: high light reflectance (i.e., brightness) and high formability (i.e., elongation). One core quality requirement is: the existence of any surface defects (such as color difference, scratch, shadow, sand hole and the like) which affect the uniformity and consistency of the surface of the oxidized finished product is not allowed. Most of the technical methods and control measures influencing the brightness, forming capability and surface defect-free control of the product have direct reverse effects, and the mutual conflict and unification of the control factors are the core of the whole product development and stabilization.
(2) Based on a typical processing process flow of 5505 aluminum alloy products for mirror surface oxidation, the main factors influencing the product quality are concentrated on the following aspects:
a. plate ingot casting technology
5505 alloy is a high-purity-base 5-series alloy plate ingot modified by adding magnesium to industrial pure aluminum with the aluminum purity of more than or equal to 99.90 percent, and two core problems of uniform distribution of phase Mg and uniformity of structure (grain size) need to be solved simultaneously in plate ingot casting. The extremely active element characteristics of Mg determine that segregation behavior of Mg during plate ingot casting can not be avoided almost, and the segregation behavior of Mg can directly cause oxidation brightness and consistency when a finished product material is subjected to mirror oxidation; meanwhile, the deterioration of Mg based on high-purity aluminum (aluminum purity is more than or equal to 99.90%) imposes strict requirements on the structure uniformity control technology during casting, and the technical method for controlling the structure uniformity of the alloy plate ingot and the technical method for preventing Mg segregation are opposite and conflict in different degrees.
b. Plate ingot hot working technology
5505 the mirror surface oxidation of aluminum alloy product is used to put forward special requirements to material surface and interface at the time of hot working. The processing surface of the aluminum alloy has heredity, the process characteristics of mirror surface oxidation determine that the interface uniformity must be strictly controlled in the hot processing process (particularly avoiding Mg segregation and oxidation while carrying out homogenization), for example, the special process function is realized by a multi-frame hot continuous rolling mill (1+3 hot continuous rolling mill) of a hot processing procedure in the American and American aluminum, if the hot continuous rolling mill is not provided, but the most commonly used single-frame hot rolling mill in China at present, direct process conflict exists between the process method which can be adopted when the surface uniformity is realized on the basis of homogenization (heat treatment) and the Mg segregation is prevented.
c. Heat treatment technique
Regarding the process design of 5505 products for mirror surface oxidation, the heat treatment technology directly determines the final forming capability of materials and directly influences the selection of the oxidation process of the formed workpiece and the brightness of the oxidized workpiece. More importantly: the mutual restriction and genetic relationship between the heat treatment technology and the whole material processing technology, wherein the grain size control of plate ingots, the homogenization technology (including aging) of heat processing, the state and functional usage of finished products and the like can directly or indirectly influence the heat treatment result of 5505 aluminum alloy, and finally cause the heat treatment technology to become one of the core technologies of product design and development
d. Surface cleaning technique
One of the core problems of the oxide mirror surface is that the surface characteristics of the material must form two basic characteristics after anodic oxidation: high brightness and high uniformity. The former means that the oxidized mirror surface needs to have enough brightness, the second means that the mirror surface itself must not have any defects affecting the uniformity and consistency of the mirror surface, such as shadows, color differences, scratches, blisters and other visible non-mirror surface characteristics, and the control core of the latter is focused on the cleaning design and control technology of the whole process of processing the surface.
e. Mirror finishing technique
5505 mirror surface processing technology of oxidized mirror surface, the hot working technology and surface control technology based on the woollen, and with rolling mirror surface faced mirror surface oxidation technology direct correlation, this technology plays the bridge role from beginning to end, simply, mirror surface processing technology, not only to mirror surface processing itself puts forward the special requirement, but also to the woollen characteristic data index before entering mirror surface processing puts forward the special requirement.
The key technical points of the invention are as follows: mirror surface oxidation uses heat treatment process of 5505 alloy. The main protection points are: homogenizing the structure when the thickness is not less than 3.0 mm; during the homogenization heat treatment, ultralow temperature homogenization annealing at 260 +/-5 ℃ for 5 hours is adopted; the stabilization heat treatment of the finished product adopts a medium-temperature heat treatment mode of preserving heat for 8 hours at 270 +/-5 ℃. No matter the homogenization or stabilization heat treatment is carried out, the temperature and the heat preservation time of the workpiece are controlled in a mode of fast rising and fast falling in the whole heat treatment process.
After understanding the methods and the like, the heat treatment process of 5505 aluminum alloy for mirror oxidation according to the present invention will be described in further detail with reference to the following embodiments:
example 1.
The equipment requirements are as follows: the air annealing furnace is the most commonly used air annealing furnace for domestic common aluminum alloy.
The specific operation steps are as follows:
(1) first stage, homogenization heat treatment:
cold rolling the cold-rolled blank to the thickness of 3.0mm, and after cleaning (namely cold-rolled mirror surface oxidation uses 5505 aluminum alloy semi-finished products), turning into the air annealing process, raising the furnace temperature to 300 ℃ for 3 hours, and beginning to preserve heat;
after the workpiece is rapidly heated to 260 ℃, setting the temperature of furnace gas to 260 ℃ and preserving the temperature for 5 hours; after the heat preservation time of 5 hours is up, closing the heating system, and opening a fan in the furnace for forced cooling; and discharging the workpiece when the temperature of the workpiece is less than or equal to 150 ℃, and transferring to a cold machining link for preparing deep machining.
(2) Second stage, stabilization heat treatment
After a cold-rolled finished product (namely a 5505 aluminum alloy finished product for cold-rolled mirror oxidation) is cleaned and processed to a target thickness (not more than 1.2mm), an air annealing process is carried out: raising the furnace temperature to 300 ℃ for 3h and starting heat preservation;
after the workpiece is rapidly heated to 270 +/-5 ℃, setting the temperature of furnace gas to 270 ℃ and preserving the temperature for 8 hours; after the heat preservation time of 8 hours is up, closing the heating system, and opening a fan in the furnace for forced cooling; and discharging the workpiece when the temperature of the workpiece is less than or equal to 150 ℃, and transferring the workpiece to an air cooling area for rapid cooling.
Preferably, in the step (1) and the step (2), the temperature rise time of the 5505 aluminum alloy semi-finished product for cold rolling mirror surface oxidation and the temperature rise time of the 5505 aluminum alloy finished product for cold rolling mirror surface oxidation do not exceed 160 min.
Preferably, the air cooling time of the step (1) and the step (2) is not more than 40min, and the air cooling is carried out until the temperature of the workpiece is 60-70 ℃.
Regardless of homogenization or stabilization heat treatment, the temperature and the heat preservation time of the workpiece are controlled in a mode of 'fast rising and fast falling' in the whole heat treatment process, and the performance index and the forming capability of the product can be effectively and stably controlled to be completely consistent with those of foreign similar products.
The 5505 aluminum alloy for mirror oxidation was heat-treated by the procedure of example 1 to obtain 5505 aluminum alloy for mirror oxidation in two use states of H24 and H26, and the properties thereof were tested, and the results are shown in table 1:
TABLE 1
As can be seen from Table 1, the heat treatment process can simultaneously give consideration to the same-furnace heat treatment of products with different widths; the alloy blank under the treatment process of the invention is matched with the mirror surface processing process developed by the inventor, so that the alloy blank can effectively adapt to the anodic oxidation process of an oxidation factory, and simultaneously, the elongation (forming capability) of the product can be ensured to stably reach the same level as that of the similar products abroad.
The invention introduces a heat treatment process of 5505 aluminum alloy for mirror surface oxidation in detail, which is suitable for heat treatment of 5505 alloy semi-finished products and finished products after deep processing of hot rolling blanks provided by the most common single-stand hot rolling mill in China; the heat treatment process is matched with a developed special hot working process (aging process), can effectively and stably improve the forming capability of the product to a level completely consistent with that of the similar products abroad, and can also be directly applied or used for guiding the heat treatment process of other 5-series alloys which take anodic oxidation treatment as a necessary link and require the product to have high forming capability. The method has the advantages of simple process control and equipment requirements for realizing industrial production, low equipment investment, strong equipment universality and low process management difficulty, and the formed economic benefit is direct and remarkable.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (8)
1. A heat treatment process of 5505 aluminum alloy for mirror surface oxidation is characterized by comprising homogenization heat treatment of 5505 aluminum alloy semi-finished products for cold rolling mirror surface oxidation and stabilization heat treatment of 5505 aluminum alloy finished products for cold rolling mirror surface oxidation;
the homogenization heat treatment comprises the following steps: rapidly heating cleaned 5505 aluminum alloy semi-finished products for cold rolling mirror surface oxidation with the thickness of not less than 3mm to 260 +/-5 ℃, preserving heat for 5 hours, air-cooling and then carrying out deep processing;
the stabilizing heat treatment comprises the following steps: and (3) quickly heating the cleaned 5505 aluminum alloy finished product for cold rolling mirror surface oxidation with the thickness of not more than 1.2mm to 270 +/-5 ℃, preserving heat for 8 hours, and then cooling by air.
2. The thermal process according to claim 1, characterized in that, during said homogenization thermal process: and air cooling is carried out until the temperature of the semi-finished product is not more than 150 ℃.
3. The thermal process according to claim 1, characterized in that, during said homogenization thermal process: the temperature rise process is not more than 160min, and the air cooling time is not more than 40 min.
4. The thermal process according to claim 3, wherein said air is cooled to a temperature of 60-70 ℃ of the semifinished product.
5. The thermal process according to claim 1, characterized in that said stabilizing thermal treatment consists in: the temperature rise process does not exceed 160 min.
6. The thermal process according to claim 1, characterized in that said stabilizing thermal treatment consists in: and air cooling is carried out until the temperature of the finished product is not more than 150 ℃.
7. The thermal process according to claim 1, characterized in that said stabilizing thermal treatment consists in: the air cooling time is not more than 40 min.
8. The heat treatment process according to claim 7, wherein the air is cooled to a final product temperature of 60-70 ℃.
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| CN112195425B (en) * | 2020-08-31 | 2022-02-18 | 新疆众和股份有限公司 | Processing technology of 5050 aluminum alloy |
| CN112176264B (en) * | 2020-08-31 | 2022-02-18 | 新疆众和股份有限公司 | Heat treatment process of 5050 aluminum alloy |
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