阅读说明：本技术 一种镁铝层合板的热轧制备方法 (Hot rolling preparation method of magnesium-aluminum laminated plate ) 是由 周存龙 赵博文 赵广辉 于 2020-04-30 设计创作，主要内容包括：一种镁铝层合板的热轧制备方法,属于金属复合板制备技术领域,特征在于实施步骤如下：S1、将镁、铝板放入加热炉内进行退火后再对其结合面进行表面处理；S2、将镁、铝板叠合一起,并用铝铆钉紧固；S3、将叠合后的镁、铝板置于电磁加热板上,以镁板为加热面,加热至400℃～450℃并保温20min～60min后取出,送入轧机进行异步粗轧；S4、将粗轧板放入加热炉内加热至370℃～400℃,保温10min～30min后,立即送入轧机进行两道次异步精轧,道次间设置回炉保温；S5、对板材进行退火处理,取出空冷。其优点在于：将异温加热与异步轧制相结合,调节镁、铝合金的塑性,并通过异步轧制的“搓轧”效果,提高板材的轧制力与协调变形能力。(A hot rolling preparation method of a magnesium-aluminum laminated plate belongs to the technical field of metal composite plate preparation, and is characterized by comprising the following implementation steps: s1, putting the magnesium and aluminum plates into a heating furnace for annealing, and then carrying out surface treatment on the combined surface; s2, overlapping the magnesium and aluminum plates together and fastening the magnesium and aluminum plates by using aluminum rivets; s3, placing the superposed magnesium and aluminum plates on an electromagnetic heating plate, taking the magnesium plate as a heating surface, heating to 400-450 ℃, keeping the temperature for 20-60 min, taking out, and sending into a rolling mill for asynchronous rough rolling; s4, placing the rough rolling plate into a heating furnace to be heated to 370-400 ℃, preserving heat for 10-30 min, immediately sending the rough rolling plate into a rolling mill to carry out two-pass asynchronous finish rolling, and setting furnace returning and heat preservation between passes; and S5, annealing the plate, taking out and air-cooling. The advantages are that: the different temperature heating and the asynchronous rolling are combined, the plasticity of the magnesium and the aluminum alloy is adjusted, and the rolling force and the coordinated deformation capability of the plate are improved through the rolling effect of the asynchronous rolling.)

1. A hot rolling preparation method of a magnesium-aluminum laminated plate is characterized by comprising the following implementation steps:

firstly, placing a magnesium plate (2) and an aluminum plate (1) into a heating furnace for stress-removing annealing treatment;

namely, the magnesium plate (2) is insulated for 0.5h at 300 ℃, and the aluminum plate (1) is insulated for 1h at 350 ℃;

secondly, performing surface treatment on the annealed magnesium plate (2) and the annealed aluminum plate (1);

respectively polishing a magnesium plate (2) and an aluminum plate (1) along the rolling width direction to increase friction force and form a sand surface effect which is easy to be bonded at high temperature, then cleaning oil stains by using absolute ethyl alcohol, and cleaning metal powder on the surface by using an ultrasonic cleaner;

thirdly, overlapping and assembling the magnesium and aluminum plates;

the magnesium-aluminum double-layer plate is formed by superposing a magnesium plate (2) and an aluminum plate (1), wherein the aluminum plate (1) is arranged above the magnesium plate (2), n small holes are drilled in the front section surface of the magnesium plate (2) in a ' door ' shape, n is not less than 4, and the magnesium plate and the aluminum plate are fixed by aluminum rivets (3 ') through the small holes;

fourthly, the double-layer plate is placed on an electromagnetic heating furnace (6) provided with a metal cover and a vent valve, the magnesium plate (2) is taken as a heating surface under the double-layer plate, the double-layer plate is heated to 400-450 ℃ under the inert atmosphere, is kept warm for 20-60 min and then is taken out, and is sent into a rolling mill (8) for asynchronous rough rolling, the reduction rate is within the range of 10-30%, and the differential ratio and the rolling speed cannot be set too large;

fifthly, placing the rough-rolled aluminum-magnesium plate into a heating furnace, heating the rough-rolled aluminum-magnesium plate in an inert atmosphere, immediately sending the rough-rolled aluminum-magnesium plate into a rolling mill for two-pass asynchronous finish rolling, setting the time for returning the aluminum-magnesium plate into the furnace for heat preservation between passes, setting the rolling temperature range to be 370-400 ℃, setting the heat preservation time to be 10-30 min, setting the rolling reduction rate to be 20-30%, and setting the differential speed ratio and the rolling speed of the rolling mill not to be;

sixthly, annealing the rolled aluminum-magnesium composite plate blank, setting the temperature to be 250-350 ℃ and the time duration to be 0.5-1.5 h, taking out and air-cooling to the room temperature.

The technical field is as follows:

the invention belongs to the technical field of metal composite plate preparation, and particularly relates to a hot rolling preparation method of a magnesium-aluminum laminated plate.

Background art:

the magnesium-aluminum laminated plate is a metal composite material with excellent mechanical property, and due to the fact that the melting point of component materials is low, the component materials are easy to recover and reuse, requirements of energy conservation, emission reduction and sustainable development can be well met, and therefore the magnesium-aluminum laminated plate has great potential in future application. The aluminum alloy has the advantages of soft texture, good corrosion resistance and extremely high intersolubility with the magnesium alloy, and can be used as a reinforcing coating to improve the application short plate with poor corrosion resistance and poor plasticity of the magnesium alloy.

According to the research in recent years, the following technical difficulties exist in the rolling lamination of the magnesium-aluminum laminated plate: 1. the processing plasticity of the magnesium alloy is greatly influenced by the temperature, and edge cracks and internal microcracks are easily generated when the rolling temperature is insufficient. In the hot rolling compounding process, the plasticity of the magnesium alloy is enhanced by reasonably increasing the rolling temperature, a laminated plate with good plate shape and high bonding strength can be prepared, and the oxidation of the magnesium alloy is difficult to control after the rolling temperature is increased. In the traditional rolling method, in order to prevent high-temperature oxidation, a magnesium and aluminum plate is generally fixed and assembled and then is sent into a heating furnace, and is heated to the same temperature under the protection of inert gas, while the aluminum alloy has higher ductility when being rolled at a temperature suitable for the processing deformation of the magnesium alloy, the reduction amount in the rolling pass is higher than that of the magnesium alloy, so that the accumulation phenomenon is easy to generate, and the surface damage is easy to generate when being finally rolled, so that the subsequent forming and processing utilization rate of the material are influenced; 2. under the same rolling force, the thinning amount in the previous rolling is larger due to the fact that the aluminum alloy is softer in texture; the magnesium alloy has smaller stress deformation degree in the early rolling, but activation of a non-basal plane slip system and transformation of texture occur after the thermal coupling effect in the early rolling, the plastic processing capability is improved, and the magnesium alloy becomes a main source of reduction of the plate thickness in the later rolling period. In the laminated plate, due to the difference of metal flow deformation capacities of the magnesium and aluminum layers, uneven stress deformation occurs in the compounding process, so that the flatness of a bonding interface is poor, the subsequent processing performance of the plate is further influenced, and the plate type control problem of the laminated plate is caused.

The invention content is as follows:

the invention aims to provide a hot rolling preparation method of a magnesium-aluminum laminated plate, which can effectively overcome the defects in the prior art.

The invention is realized in such a way, and is characterized by comprising the following implementation steps:

firstly, putting a magnesium plate and an aluminum plate into a heating furnace for stress relief annealing treatment;

namely, the magnesium plate is kept warm for 0.5h at 300 ℃, and the aluminum plate is kept warm for 1h at 350 ℃;

secondly, carrying out surface treatment on the annealed magnesium plate and the annealed aluminum plate;

respectively polishing a magnesium plate and an aluminum plate along the rolling width direction to increase friction force and form a sand surface effect which is easy to be bonded at high temperature, then cleaning oil stains by using absolute ethyl alcohol, and cleaning surface metal powder by using an ultrasonic cleaner;

thirdly, overlapping and assembling the magnesium and aluminum plates;

the method comprises the following steps of (1) overlapping a magnesium plate and an aluminum plate together, wherein the aluminum plate is arranged on the upper part, the magnesium plate is arranged on the lower part, n small holes are drilled in the front section surface of the magnesium plate in a 'door' shape, n is more than or equal to 4, and the magnesium plate and the aluminum plate are fixed through the small holes by using aluminum rivets to form a 'magnesium-aluminum double-layer plate';

fourthly, the magnesium-aluminum double-layer plate is placed on an electromagnetic heating plate to be heated, the magnesium plate surface is taken as a heating surface under the magnesium plate surface, the heating is carried out to 400-450 ℃ under the inert atmosphere, the temperature is kept for 20-60 min, then the magnesium plate is taken out and sent into a rolling mill to be subjected to asynchronous rough rolling, the reduction rate is within the range of 10-30%, and the differential ratio and the rolling speed cannot be set too large;

fifthly, placing the rough-rolled aluminum-magnesium plate into a heating furnace, heating the rough-rolled aluminum-magnesium plate in an inert atmosphere, immediately sending the rough-rolled aluminum-magnesium plate into a rolling mill for two-pass asynchronous finish rolling, setting the time of returning to the furnace and keeping the temperature between passes, wherein the rolling temperature range is 370-400 ℃, the heat preservation time is 10-30 min, and the rolling reduction rate is 20-30%; it should be noted that the different speed ratio and the rolling speed of the rolling mill cannot be set too large;

sixthly, annealing the rolled magnesium-aluminum composite plate blank, setting the temperature to be 250-350 ℃ and the time duration to be 0.5-1.5 h, taking out and air-cooling to the room temperature.

The invention has the beneficial effects that:

compared with the conventional rolling, the method combines the different-temperature heating and the asynchronous rolling, and improves the deformation coordination of the bimetal composite. In the preparation process of the magnesium-aluminum laminated plate, the magnesium-aluminum double-layer plate assembly blank plate is placed on an electromagnetic heating plate, only the magnesium plate is heated in an inert atmosphere, a temperature gradient is formed through contact heat transfer between the plates, the initial plastic deformation capacity of magnesium and aluminum alloy is adjusted, and the rolling deformation pressure and the coordinated deformation capacity of the plate are improved through the rolling effect of asynchronous rolling. In the subsequent finish rolling process, the plastic deformation capacity of the magnesium alloy is improved under the action of initial thermal coupling, and the laminated plate with excellent performance can be obtained through two times of asynchronous rolling with low reduction rate. The method has good effects of improving the flatness of the composite interface of the plate, improving the deformation coordination and the interface combination capability of the laminated plate and controlling the plate shape.

Description of the drawings:

FIG. 1 is a schematic view of a magnesium and aluminum plate assembly method.

Fig. 2 is a schematic view of an electromagnetic heating plate.

Fig. 3 is a schematic view of asynchronous rolling.

In the figure: 1-aluminum plate, 2-magnesium plate, 3-magnesium and aluminum plate superposed assembly, 3' -aluminum rivet, 4-metal cover, 5-vent valve, 6-electromagnetic heating plate, 7-feeding clamp and 8-rolling mill

The specific implementation mode is as follows:

the principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

In this example, a 1060 pure aluminum plate of 100 × 80 × 3mm and an AZ31 magnesium alloy plate of 100 × 80 × 4mm were selected as constituent materials, and the specific implementation steps were as follows:

1. firstly, performing stress relief annealing treatment on a magnesium plate and an aluminum plate: the annealing temperature of the magnesium plate is 300 ℃, the heat preservation time is 0.5h, the annealing temperature of the aluminum plate is 350 ℃, and the heat preservation time is 1 h;

2. carrying out surface treatment on the annealed magnesium and aluminum plates: firstly, grinding the laminated surfaces of the plates along the rolling width direction by using 400-mesh, 800-mesh and 1200-mesh sand papers respectively, washing oil stains by using absolute ethyl alcohol, and removing metal scraps by using an ultrasonic cleaner;

3. after the magnesium and aluminum plates are stacked and assembled, 5 small holes are punched in the front section of the plate surface in a ' door ' shape (as shown in figure 1) and are riveted and fastened by aluminum rivets 3 ' to form a magnesium-aluminum double-layer plate 3;

4. as shown in fig. 2 and 3, the magnesium-aluminum double-layer plate 3 is placed on an electromagnetic heating plate 6 for heating, inert gas is introduced through a vent valve 5 after a metal cover 4 is covered, high-temperature oxidation of magnesium alloy is prevented, heat is preserved for 0.5h after the heating temperature reaches 400 ℃, and then the magnesium-aluminum double-layer plate is immediately sent into a rolling mill for asynchronous rough rolling, wherein the rolling reduction rate is 30%, the differential speed ratio is 1.2, and the rolling speed is 15 rpm;

5. and (2) placing the roughly rolled aluminum-magnesium plate into a heating furnace, heating the aluminum-magnesium plate in an inert atmosphere, immediately sending the aluminum-magnesium plate into a rolling mill for two-pass asynchronous finish rolling, setting the furnace returning and heat preservation between passes, wherein the rolling temperature is 380 ℃, the first pass heat preservation is 15min, the reduction rate is 25%, the second pass heat preservation is 15min, the reduction rate is 20%, the differential speed ratio of the rolling mill is 1.1, and the rolling speed is 12 rpm.

6. And (3) annealing the composite plate blank at the temperature of 300 ℃ for 0.5h, taking out, and air-cooling to room temperature to obtain the magnesium-aluminum laminated plate.