CN114433653A - Magnesium alloy extruded section bar thermal straightening-aging integrated treatment method and device thereof - Google Patents
Magnesium alloy extruded section bar thermal straightening-aging integrated treatment method and device thereof Download PDFInfo
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- CN114433653A CN114433653A CN202011204167.1A CN202011204167A CN114433653A CN 114433653 A CN114433653 A CN 114433653A CN 202011204167 A CN202011204167 A CN 202011204167A CN 114433653 A CN114433653 A CN 114433653A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
- B21C35/02—Removing or drawing-off work
- B21C35/03—Straightening the work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
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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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
A magnesium alloy extruded section hot straightening-aging integrated processing method and a device thereof comprise: the top surface of the base is provided with a guide rail along the length direction; the stretching straightener comprises two trolleys which are arranged at two ends of a base guide rail, and conductive chucks are respectively arranged on the trolleys; the heat insulation and insulation box is arranged on the base and is positioned between the two trolleys; the heat insulation incubator comprises an upper box body, a lower box body, a hot air leading-in pipeline, a hot air leading-out pipeline and a hot air generator, wherein the hot air leading-in pipeline and the hot air leading-out pipeline are introduced into the heat insulation incubator; a liftable supporting platform and a lifting adjusting driving device are arranged in the lower box body; the controller, the trolley, the direct current power supply generating device, the hot air generator and the driving device are all connected with the controller. The invention solves a series of problems that the heating efficiency is not high, the uniformity of the heated section is not good, the self weight of the extruded section before heating is easy to cause the deflection increase, the aging treatment time and flow is long, the section after aging is bent, and the like, and realizes the integrated processing treatment of the stretching straightening and the aging treatment process.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy, and particularly relates to a magnesium alloy extruded section hot straightening-aging integrated treatment method and a device thereof.
Background
The magnesium alloy is used as a light metal structure material, and has wide application prospect in the fields of automobiles, rail traffic, aerospace and the like. Hot extrusion is one of the most important modes in the plastic deformation processing mode of magnesium alloy, and various plate bars, pipes and sections, including various sections with cavity bodies with complicated outer contours, can be obtained through extrusion. In the process of extruding magnesium alloy pipes, bars and sections, due to the limitation of various process conditions, due to a plurality of factors such as poor uniformity of internal structures of blanks, uneven temperature distribution, design deviation of dies and the like, extruded sections are bent or twisted under the influence of external force action, uneven cooling speed and the like, the straightness of the extruded sections is not ideal, the yield is seriously influenced, and the extruded sections which meet the use requirements in order to obtain the dimensional precision must be straightened.
Because the requirement on the surface quality of an alloy product is higher during industrial application, a straightening machine is generally adopted for tension straightening in order to reduce the surface scratch of the magnesium alloy extruded section; especially, the alloy section with a complex section is more suitable for stretching and straightening. However, magnesium alloy has large resistance to tensile deformation and poor plastic deformation capability at normal temperature, and when the original bending of the material is large, if the material is stretched and straightened at room temperature, the straightening rebound is large, and the material is even broken. Therefore, the magnesium alloy material needs to be heated to a certain temperature to be stretched and straightened.
In order to further improve the mechanical properties of the extruded profile, the straightened extruded profile often needs aging heat treatment, that is, after the straightened extruded profile is kept at a certain temperature for a certain time, a series of fine dispersion strengthening phases are formed in the internal structure of the profile to further improve the strength level of the profile.
Heating the magnesium alloy extruded section, straightening by a straightening mechanism, and then carrying out aging heat treatment in an aging furnace to finally obtain a corresponding extruded section product.
Compared with the heating mode of stretch straightening of magnesium alloy materials, the stretch straightening equipment of the magnesium alloy materials at present mainly comprises two types:
1. the magnesium alloy material is firstly put into a heating furnace to be heated to a preset temperature, and then is transferred to a stretching straightener to be stretched and straightened.
The main problems of the process are as follows: in the process of transferring the magnesium alloy taken out of the heating furnace to the stretch leveler, the temperature of the material itself drops extremely rapidly due to the good thermal conductivity of the magnesium alloy, and therefore the heating temperature value in the preceding stage has to be increased. The method increases energy consumption, has various working procedures, increases production cost, is easy to generate thermal deformation, and is easy to generate grain growth at overhigh temperature, thereby causing serious deterioration of material performance.
2. The magnesium alloy material is heated and straightened on line on a stretching straightening machine, and the current main mode is as follows:
firstly, a heating mode of a resistance furnace: and a heating cavity is arranged outside the stretching area, namely, the whole stretching and straightening area of the extruded section is arranged in a resistance heating furnace for integral resistance heating. For example, in the stretching straightener proposed in chinese patent application No. 201710455959.8, resistance wires are arranged on the outer cavity wall for heating, and the heating principle is that radiation heat transfer is performed from the outer wall to the center. The main problems of the method are as follows: if the bending degree of the magnesium alloy material to be straightened is larger, the part with large bending deflection is close to the cavity wall, the heat radiation quantity is high, the temperature is higher, the part close to the central line is far away from the cavity wall, the heat radiation quantity is less, the temperature is lower, the heating unevenness of the whole material is inevitably caused, the integral heating uniformity of the section is difficult to ensure, and the straightening effect is not ideal due to the uneven temperature in the stretching straightening process. Meanwhile, the resistance heating time is generally longer to reach the preheating and temperature equalizing temperature required by the stretching and straightening, and the heating efficiency is lower, so that the method is greatly limited.
The direct current heating mode is as follows: the positive and negative electrodes are additionally arranged on the clamps at the two ends, the magnesium alloy material is used as a resistor, the magnesium alloy material is heated to the required temperature by adopting a low-voltage and high-current mode and then is stretched and straightened, for example, a stretching and straightening device of the on-line heating and straightening process of the magnesium alloy extruded material of Chinese patent application No. 201110194347.0, a synchronous compound process of rapid aging and stretching and straightening of magnesium alloy of Chinese patent application No. 201210392031.7 and the like are used. The main problems of the method are as follows:
firstly, if the section of the magnesium alloy material is not uniform, such as the wall thickness of a pipe is not uniform and the sections with various irregular sections are not uniform, when current flows to a path with the minimum resistance according to the physical law, the heating temperatures of different parts of the section of the whole section are not uniform; in addition, the core of the cross section has slow heat dissipation and the outer surface has fast heat dissipation, which leads to the core temperature being generally higher. The temperature and plasticity of different temperature areas are different, the tensile strength is different, and the withdrawal and straightening effect is seriously influenced;
the magnesium alloy has strong conductivity and low unit resistance, and the magnesium material is easy to be not heated and the temperature of the clamp is easy to be too high. Therefore, the single electric heating method has its own disadvantages.
And thirdly, in the electric heating process, the center of the section in the length direction of the section falls down and bends due to the influence of the self weight of the section, so that the straightened section is not uniform and the center bends down.
After the straightened extruded profile is cooled to room temperature for standby, in order to improve the mechanical property of the extruded profile, proper aging heat treatment is often needed, namely, after the straightened extruded profile is reheated to a certain temperature and is subjected to heat preservation for a certain time, a strengthening phase is formed in the internal structure of the profile to improve the final strength level of the profile. In the conventional aging treatment program, the preheating time of reheating is wasted, and energy is also wasted in the reheating process, and the time efficiency is generally longer, the energy consumption is high, and the efficiency is low under the common heating and heat preservation conditions. In addition, the stretched and straightened materials are often heated and bent during the reheating process.
The Chinese patent application No. 201210392031.7 discloses a synchronous composite process for rapid aging and stretch straightening of magnesium alloy, wherein a magnesium alloy workpiece is heated to 170-250 ℃ by electrifying, the temperature is kept for 20-40 min, then the magnesium alloy workpiece is stretched and straightened, the magnesium alloy workpiece is loosened after the stretch straightening is finished, and the magnesium alloy workpiece is naturally cooled. Besides the defects of the electric heating, the method has obvious defects of firstly carrying out aging strengthening and then carrying out stretching straightening. On one hand, the strength of the magnesium alloy after the aging strengthening is generally obviously improved, the plasticity is obviously reduced, the straightening resistance required in the stretching and straightening process is obviously increased, so that the straightening force is increased, the straightening resilience is obviously increased, the energy used for stretching is wasted, and the straightening success rate is obviously reduced (resilience or breaking). On the other hand, because the aging heat treatment process is not carried out after the straightening, the residual stress of the stretching and straightening is overlarge, and hidden troubles exist in the later use of the material. Further optimization is therefore required.
Disclosure of Invention
The invention aims to provide a magnesium alloy extruded profile thermal straightening-aging integrated treatment method and a device thereof, which solve a series of problems that the heating efficiency is not high, the uniformity of the heated profile is not good, the deflection of the extruded profile before heating is easy to increase due to the self weight of the extruded profile, the aging treatment time flow is long, the profile after aging is bent, and the like in the existing extruded profile preparation process, and realize the integrated processing treatment of the stretching straightening and the aging treatment process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a magnesium alloy extruded section hot straightening-aging integrated device comprises: the top surface of the base is provided with a guide rail along the length direction; the stretching straightener comprises two trolleys which are arranged at two ends of the base guide rail, conductive chucks for clamping extruded profiles are respectively arranged on the two trolleys, and the conductive chucks are connected with a direct-current power supply generating device through power lines; the heat insulation and insulation box is arranged on the base and is positioned between the two trolleys; the heat insulation incubator comprises an upper box body, a lower box body and a plurality of hot air leading-in pipelines and hot air leading-out pipelines which are led into the heat insulation incubator, and the hot air leading-in pipelines and the hot air leading-out pipelines are connected to a hot air generator; a lifting support platform and a lifting adjusting driving device are arranged in the lower box body; and the controller is connected with the direct-current power supply generating device, the hot air generator, the lifting adjusting driving device and the stretching straightener.
The invention relates to a magnesium alloy extruded section hot straightening-aging integrated treatment method, which comprises the following steps:
1) the magnesium alloy section bar passes through the heat insulation and insulation box, two ends of the magnesium alloy section bar are clamped by conductive chucks on two trolleys, one trolley is fixed on a guide rail, and the other trolley is controlled to generate a stretching force to straighten the magnesium alloy section bar;
2) a supporting platform in the lower box body of the heat insulation and insulation box ascends to contact and support the bottom surface of the magnesium alloy section;
3) turning on a direct-current power supply generating device, and electrifying a conductive chuck to preheat the magnesium alloy section to a set straightening treatment temperature;
4) homogenizing and insulating the magnesium alloy section by hot air to the set straightening treatment temperature;
5) adjusting a supporting platform in the lower box body of the heat insulation and insulation box to contact and support the bottom surface of the straightened magnesium alloy section;
6) stretching the magnesium alloy section by a stretching and straightening machine to carry out straightening treatment and keep clamping;
7) adjusting a supporting platform in a lower box body of the heat insulation and insulation box to the bottom surface of the straightened magnesium alloy section;
8) the conductive chuck is electrified to heat the magnesium alloy section, and the temperature is adjusted to the aging treatment temperature;
9) and adjusting the temperature of the hot air to ensure that the temperature in the heat-insulating and heat-preserving box reaches the aging treatment temperature and preserving the heat, thereby finishing the straightening-aging integrated treatment process.
The invention relates to a magnesium alloy extruded section hot straightening-aging integrated processing method and a device thereof, wherein the method comprises the following steps:
1. the heating and straightening treatment device of the magnesium alloy extruded section comprises the following devices:
the invention adopts electric heating, is a quick and effective heating mode, and is provided with a cavity body in order to reduce heat loss, and the external heat-insulating material prevents the heat loss from being too fast. The electric heating device is characterized in that the fixed chuck and the movable chuck of the straightening machine are respectively provided with a conductive chuck and connected with a copper bar as a current input port, and the copper bar is connected with a current generator in series. When the device works, the two ends of the extruded section to be stretched and straightened are clamped, large current is input, and the section is heated by heat generated by the resistance of the extruded section.
Because the distribution density of the current on the complicated section is not uniform, the temperature of the section is obviously uneven by singly electrically heating, which is a hidden trouble of non-uniform deformation of stretching and straightening, and the deformation is not uniform subsequently. In order to improve the temperature uniformity of each part of the sectional material, including each part with different sections and thicknesses, the invention proposes to introduce a dispersion circulating hot air curtain for dispersion heating. It is generally considered that a heat-insulating cover is provided outside the profile, and the cover body is filled with a heat-insulating material to perform heat insulation. However, the temperature of the cover body may need to be raised, and it is very difficult to achieve uniform temperature by simply using the heat of electric heating to perform heat preservation, so that other ways of preheating and heat preservation are needed to be involved to achieve uniform temperature of the section. In the scheme of the invention, the hot air curtain is newly designed to circulate flowing air to continuously preheat and uniformly preserve heat of the extruded section which is quickly preheated by current.
The hot air dispersion heating means that hot air at a target temperature is generated by a hot air generator, the hot air at the target temperature is blown to the bottoms of all sections in a heat insulation box arranged along the length direction of a base guide rail through a hot air leading-in pipeline, the heat insulation box and the sectional materials at all the sections are heated at the same temperature, the hot air is input into the heat insulation box from the pipelines, wraps extruded sectional materials, flows to the upper part of the heat insulation box, is guided back to the hot air generator through a hot air leading-out pipeline, is heated to the target temperature through the hot air generator, and is circularly conveyed into the heat insulation box for use, namely a relatively sealed cavity is arranged outside a stretching area, and the magnesium alloy sectional material to be straightened which is electrically heated and preheated is integrally and uniformly heated to the target temperature by adopting a mode that the hot air generator blows hot air into the cavity of the heat insulation box.
The height of the lower inner surface of the heat insulation and heat preservation box is adjusted to be consistent with the jaw of the stretching and straightening machine through the up-down lifting device. After the extruded section is clamped by the jaw, the height of the heat preservation furnace body is adjusted, the height of the lower inner surface of the heat insulation heat preservation box is kept consistent with that of the bottom end surface of the section, all parts of the section can be supported, the section is prevented from falling, bending and deteriorating in the heating process, and therefore the straightness of the section is prevented from deteriorating.
2. The on-line stretching straightening and rapid aging treatment process comprises the following steps:
after the stretching and straightening treatment, the clamping heads are kept to clamp the extruded section, the section is continuously subjected to electric heating and hot air curtain heating and heat preservation, the temperature is adjusted to the temperature range corresponding to the aging treatment, and the aging heat preservation treatment is carried out.
In the treatment process, the electric heating can promote the diffusion of alloy elements, accelerate the phase precipitation speed of aging heat treatment and is beneficial to the effect and efficiency of aging.
Meanwhile, the magnesium extruded section is subjected to certain temperature plastic deformation by using the stretching straightener, the temperature plastic deformation in on-line straightening can induce the diffusion of alloy elements in the magnesium extruded section and promote the aging precipitation, the aging is accelerated through the strain generated by straightening, the aging effect of the magnesium alloy extruded section can be improved, and the strength of the magnesium section is greatly increased.
Preferably, in the step 3), the conductive clamp is electrified to preheat the magnesium alloy section, and the straightening treatment temperature range is set to be 50-500 ℃;
preferably, in the step 4), the magnesium alloy section is subjected to hot air homogenization and heat preservation treatment until the set straightening treatment temperature range is 50-500 ℃;
preferably, in the step 8) and the step 9), the aging treatment temperature ranges from 50 ℃ to 250 ℃, and the heat preservation treatment time is 0.1 hour to 8 hours.
The innovation of the invention is that:
the utility model provides a design tensile straightening of extruded profile and ageing integrated device: the device is innovative in that: on one hand, the preheating speed is increased and the preheating efficiency is improved by using electric heating; on the other hand, hot air flow is used on the stretching straightener to carry out uniform temperature on the section bar, and the magnesium alloy material (whether the bar, the pipe or the section bar with good applicability) is integrally and uniformly heated; in addition, in order to reduce bending of the section caused by overlong stretching, a heat insulation platform is arranged in a targeted mode, the section is supported, bending is reduced, and straightness is checked in real time.
The invention provides a novel extrusion straightening and aging integrated process which comprises the following steps: on one hand, the integration realizes the compounding of multiple processes and multiple devices; meanwhile, the aging accelerated precipitation process is obtained by doubly utilizing the increasing and improving effects of the heating current and the tensile straightening strain on the diffusion efficiency of the element atoms of the material, and the aging treatment efficiency is improved; in addition, the platform is arranged, so that the damage to the straightness in the aging treatment heating process is prevented, and the extruded section still keeps high precision after aging.
The invention has the beneficial effects that:
1) the invention uses electric heating, the preheating speed is accelerated; the hot air flow is used for carrying out temperature equalization on the section bar, the integral heating is uniform, the section bar and the hot air flow are combined into a whole, and the preheating efficiency before straightening is improved.
2) The electric heating and the hot air flow heating are combined, so that the problem of uneven temperature caused by complicated cross section and uneven current density of single electric heating is avoided, and the problem of slow temperature rise of the air flow heating is also solved; the method has the outstanding advantages that the method can solve the problem of temperature rise uniformity of the extruded section with a more complicated section before straightening, and ensures the temperature uniformity and the heating efficiency of the complicated section.
3) The problems that the extruded section material falls and bends in the heating process and the section material is re-bent in the straightening post-heat treatment process are solved, and the prepared extruded section material has better strength and straightness.
4) The temperature plastic deformation in the on-line straightening can induce the aging precipitation of the magnesium extruded section, the aging is accelerated through the strain generated by the straightening, the aging effect of the magnesium alloy extruded section can be improved, and the strength of the magnesium section is increased; meanwhile, the aging is added after the stretching and straightening are carried out on line, so that the thermal bending deformation of aging heating can be reduced, the straightening effect can be better kept, and the flatness of the section bar can be ensured.
5) The three processes of 'uniform heating', 'stretching straightening' and 'aging treatment' required by magnesium alloy material straightening are complementarily combined into a whole, the magnesium alloy material can be more accurately stretched, straightened and subjected to aging heat treatment according to the preset temperature, the processes are shortened, the energy consumption is reduced, the processing treatment efficiency is obviously improved, the strain deformation after straightening/aging treatment is reduced, and the like, and a more straight product can be obtained in a batch treatment and high efficiency manner.
Drawings
FIG. 1 is a schematic structural diagram of the magnesium alloy extruded section hot straightening-aging integrated device.
Detailed Description
The technical solution of the present invention is described in detail by the following examples, which are implemented on the premise of the technical solution of the present invention, and the detailed implementation and the specific operation process are given, but the scope of the present invention to be protected is not limited to the following examples.
Referring to fig. 1, the magnesium alloy extruded profile hot straightening-aging integrated device of the present invention comprises:
the top surface of the base 1 is provided with a guide rail along the length direction;
the stretching straightener 2 comprises two trolleys 21 and 22 which are arranged at two ends of the guide rail of the base 1, wherein the trolleys 21 are fixed, and the trolleys 22 are provided with stretching driving devices capable of generating straightening force; the two trolleys 21 and 22 are respectively provided with a conductive chuck 3 and 3 'for clamping the extruded section 100, and the conductive chuck 3 and 3' are connected with a direct current power supply generating device 4 through power lines;
the heat insulation and insulation box 5 is arranged on the base 1 and is positioned between the two trolleys 21 and 22; the heat insulation and insulation box 5 comprises an upper box body 51, a lower box body 52 and a plurality of hot air leading-in pipelines 53 and hot air leading-out pipelines 54 which are led into the heat insulation and insulation box 5, wherein the hot air leading-in pipelines 53 and the hot air leading-out pipelines 54 are connected to a hot air generator 55; a liftable supporting platform 56 and a lifting adjusting support and driving device 57 are arranged in the lower box body 52;
and the controller 6 is connected with the trolley of the stretching straightener, the direct-current power supply generating device, the hot air generator and the lifting adjusting driving device.
The invention relates to a magnesium alloy extruded section hot straightening-aging integrated treatment method, which comprises the following steps:
1) the magnesium alloy section bar passes through the heat insulation and insulation box, and two ends of the magnesium alloy section bar are clamped by conductive chucks on the two trolleys;
2) a supporting platform in the lower box body of the heat insulation and insulation box ascends to contact and support the bottom surface of the magnesium alloy section;
3) turning on a direct-current power supply generating device, and electrifying the conductive clamp to preheat the magnesium alloy section to a set straightening treatment temperature;
4) homogenizing and insulating the magnesium alloy section by hot air to the set straightening treatment temperature;
5) adjusting a supporting platform in the lower box body of the heat insulation and insulation box to contact and support the bottom surface of the straightened magnesium alloy section;
6) stretching the magnesium alloy section by a stretching and straightening machine to carry out straightening treatment and keep clamping;
7) adjusting a supporting platform in a lower box body of the heat insulation and insulation box to the bottom surface of the straightened magnesium alloy section;
8) the conductive chuck is electrified to heat the magnesium alloy section, and the temperature is adjusted to the aging treatment temperature;
9) and adjusting the temperature of the hot air to ensure that the temperature in the heat-insulating and heat-preserving box reaches the aging treatment temperature and preserving the heat, thereby finishing the straightening-aging integrated treatment.
Preferably, in the step 3), the conductive clamp is electrified to preheat the magnesium alloy section, and the temperature range of straightening treatment is set to be 50-500 ℃.
Preferably, in the step 4), the magnesium alloy section is subjected to hot air homogenization and heat preservation treatment until the set straightening treatment temperature range is 50-500 ℃.
Preferably, in the step 8) and the step 9), the aging treatment temperature ranges from 50 ℃ to 250 ℃, and the heat preservation treatment time is 0.1 hour to 8 hours.
Example (b):
this example selects AZ80 (Mg-8% Al-0% Zn-0.5% Mn) magnesium alloy extrusion. Preheating an AZ80 magnesium alloy bar at 350 ℃, extruding an AZ80 magnesium alloy section with a reversed-T-shaped section, drawing, placing in a cooling bed, and cooling, wherein the slight bending of the section needs to be straightened.
Carrying out heat straightening-aging integrated treatment:
the obtained AZ80 magnesium alloy extruded rectangular section is clamped at two ends of the extruded AZ80 magnesium alloy section by a conductive clamping head of a stretching straightener; through the lifting adjusting support, the supporting platform in the lower box body of the heat insulation incubator moves upwards to contact the bottom surface of the AZ80 magnesium alloy section bar and is supported; the temperature value of straightening treatment is set to be 200 ℃ through electric heating control, so that the heating control temperature is set to be 200 ℃, and the magnesium alloy section is preheated;
opening a hot air generator, controlling the temperature of hot air at 200 ℃, outputting the hot air at 200 ℃ into a heat-insulating incubator through a hot air output pipeline, feeding the hot air into the hot air generator through a hot air input pipeline, and carrying out homogenization heat insulation treatment on the magnesium alloy section bar in the heat-insulating incubator until the set straightening treatment temperature is 200 ℃; a supporting platform in a lower box body of the heat insulation and insulation box is adjusted to be lifted to the bottom surface position of the straightened section through a lifting adjusting support, and the section is stretched and straightened and is kept clamped;
then further adjusting a supporting platform in the lower box body of the heat insulation and insulation box to the bottom surface of the section bar to be straightened; adjusting the electric heating of the rectangular extruded section to an aging treatment temperature of 165 ℃ by a controller; adjusting the temperature of hot air to 165 ℃ of aging treatment temperature through a hot air generator and preserving heat; finishing heat preservation aging treatment after 5 hours, and loosening the clamp jaw to finish heating straightening and aging treatment processes.
Through the steps, the high-performance AZ80 magnesium alloy extruded I-shaped section bar subjected to stretching, straightening and aging integrated treatment is obtained.
Comparative example:
the extruded AZ80 magnesium alloy section with the cross section shaped like a Chinese character 'ji' is preheated to 200 ℃ in a heat-insulating resistance furnace, taken out, clamped into a jaw of a chuck of a straightening machine, and pulled by the straightening machine for straightening. After straightening, putting the steel plate into a resistance furnace again for aging, wherein the time effect reaches the peak value only when the time effect is 12 hours. The mechanical properties tested are shown in the table for comparison.
The extruded shape-only type AZ80 magnesium alloy section bar, which was obtained by performing the integrated thermal straightening-aging treatment on the extruded section bar using the apparatus and process of the present invention, was analyzed and compared with the section bar obtained by the comparative example, see Table 1.
As can be seen from Table 1, the technical performance index of the AZ80 magnesium alloy section bar is obviously improved by implementing the method of the invention, and beneficial technical effects are obtained.
TABLE 1
In conclusion, the method integrates three procedures of 'uniform heating', 'stretching straightening' and 'aging treatment' required by magnesium alloy material straightening and aging heat treatment, is particularly suitable for the sectional material with the special-shaped section, can accurately and uniformly heat the magnesium alloy material according to the preset temperature to realize stretching straightening, and can continuously perform the subsequent aging heat treatment process on line.
Claims (5)
1. The utility model provides a magnesium alloy extruded profile hot straightening-ageing integrated device which characterized in that includes:
the top surface of the base is provided with a guide rail along the length direction;
the stretching straightener comprises two trolleys which are arranged at two ends of the base guide rail, conductive chucks for clamping extruded profiles are respectively arranged on the two trolleys, and the conductive chucks are connected with a direct-current power supply generating device through power lines;
the heat insulation and insulation box is arranged on the base and is positioned between the two trolleys; the heat insulation heat preservation box comprises an upper box body, a lower box body and a plurality of hot air leading-in pipelines and hot air leading-out pipelines which are led into the heat insulation heat preservation box, and the hot air leading-in pipelines and the hot air leading-out pipelines are connected to a hot air generator; a lifting support platform and a lifting adjusting driving device are arranged in the lower box body;
and the stretching straightener trolley, the direct current power supply generating device, the hot air generator and the lifting adjusting driving device are all connected with the controller.
2. The magnesium alloy extruded profile hot straightening-aging integrated treatment method using the magnesium alloy extruded profile hot straightening-aging integrated device as set forth in claim 1, characterized by comprising the steps of:
1) the magnesium alloy section bar passes through the heat insulation and insulation box, two ends of the magnesium alloy section bar are clamped by conductive chucks on two trolleys, one trolley is fixed on a guide rail, and the other trolley is controlled to generate a stretching force to straighten the magnesium alloy section bar;
2) a supporting platform in the lower box body of the heat insulation and insulation box ascends to contact and support the bottom surface of the magnesium alloy section;
3) turning on a direct-current power supply generating device, and electrifying the conductive clamp to preheat the magnesium alloy section to a set straightening treatment temperature;
4) homogenizing and insulating the magnesium alloy section by hot air to the set straightening treatment temperature;
5) adjusting a supporting platform in the lower box body of the heat insulation and insulation box to contact and support the bottom surface of the straightened magnesium alloy section;
6) stretching the magnesium alloy section by a stretching and straightening machine to carry out straightening treatment and keep clamping;
7) adjusting a supporting platform in a lower box body of the heat insulation and insulation box to the bottom surface of the straightened magnesium alloy section;
8) the conductive chuck is electrified to heat the magnesium alloy section, and the temperature is adjusted to the aging treatment temperature;
9) and adjusting the temperature of the hot air to ensure that the temperature in the heat-insulating and heat-preserving box reaches the aging treatment temperature and preserving the heat, thereby finishing the heat straightening-aging integrated treatment.
3. The heat straightening-aging integrated treatment method as set forth in claim 2, wherein in the step 3), the conductive chuck is electrified to preheat the magnesium alloy section, and the temperature range for straightening treatment is set to 50-500 ℃.
4. The heat straightening-aging integrated treatment method as set forth in claim 2, wherein in the step 4), the magnesium alloy section is subjected to the hot air homogenization heat preservation treatment until the set straightening treatment temperature range is 50-500 ℃.
5. The integrated heat straightening-aging treatment method as set forth in claim 2, wherein in step 8) and step 9), the aging treatment temperature is in the range of 50 to 250 ℃ and the heat-preserving treatment time is 0.1 to 8 hours.
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