A method for preparing aluminum-titanium steel clad plate by differential temperature rolling

Abstract

The present application relates to a kind of aluminium-titanium steel composite plate prepared by different temperature rolling method, comprising: step S1, aluminium plate, thin aluminium plate, titanium plate, pure iron plate, steel plate drilling processing, step S2, surface treatment, step S3, riveting preloading, step S4, induction heating, step S5, blank rolling, step S6, cooling after rolling.The present application provides a kind of new aluminium-titanium steel composite plate preparation method, compared with the traditional explosive composite method preparation aluminium-titanium steel composite plate, the new rolling composite method preparation aluminium-titanium steel composite plate method provided by the present application, small pollution, process simplification, simple process, easy operation, suitable for industrial large-scale production, aluminium-titanium steel composite plate prepared by the method of the present application has good interface bonding strength, good plate shape, high yield.

Description

Technical Field

[0001] This invention relates to the field of rolling composite technology, and more particularly to a method for preparing aluminum-titanium steel composite plates by differential temperature rolling. Background Technology

[0002] Aluminum alloy-steel transition joints (referred to as aluminum-steel transition joints) are cut from aluminum-steel composite plates and used to connect aluminum alloy superstructures and steel hull plates in ships. Currently, most aluminum-steel composite plates used in aluminum-steel transition joints are produced by explosive bonding. To enhance the bonding quality between the aluminum alloy plate and the steel plate, pure titanium or pure aluminum is often used as the interlayer, forming aluminum-titanium-steel transition joints and aluminum-aluminum-steel transition joints. Because the bonding strength and electrochemical corrosion resistance of aluminum-titanium-steel transition joints are significantly better than those of aluminum-aluminum-steel transition joints in practical applications, aluminum-steel transition joints prepared with titanium as the intermediate layer have unique advantages. However, due to the severe pollution caused by the explosive bonding method, this method has begun to be gradually banned in some countries.

[0003] Rolling composite processes are widely used in the production of various metal layered composite plates due to their low pollution, high production efficiency, and stable product performance. However, no research has yet indicated how to produce aluminum-titanium-steel composite plates in a single rolling process. This is mainly because the titanium-steel interface requires a high bonding temperature. Even with the addition of interlayer materials that promote bonding, such as nickel or pure iron, the temperature still exceeds 760°C, which is higher than the melting point of aluminum. Therefore, it is impossible to directly produce aluminum-titanium-steel composite plates using ordinary rolling composite methods. Furthermore, when aluminum, titanium, and steel are directly hot-rolled together, the significant difference in deformation resistance among the three metals can lead to deformation incoordination, making effective bonding difficult. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing aluminum-titanium-steel composite plates by heterothermal rolling, which solves the problem that aluminum, titanium, and steel are dissimilar metals that are difficult to roll and composite due to the large difference in deformation resistance and melting point during the rolling process.

[0005] The technical solution adopted in this invention is as follows:

[0006] The present invention provides a method for preparing aluminum-titanium steel composite plates by differential temperature rolling, comprising the following steps:

[0007] Step S1: Prepare the corresponding aluminum plates, thin aluminum plates, titanium plates, pure iron plates and steel plates, and perform drilling processing on them respectively: Drill through holes at the same position at the end of the aluminum plates, thin aluminum plates, titanium plates, pure iron plates and steel plates entering the rolling mill;

[0008] Step S2, Surface treatment: Clean the oxides and oil stains from the surfaces of the aluminum plate, thin aluminum plate, titanium plate, pure iron plate and steel plate to be laminated obtained in step S1;

[0009] Step S3, riveting pre-assembly: the assembly sequence is aluminum plate-thin aluminum plate-titanium plate-pure iron plate-steel plate, a titanium gasket with holes is added between the thin aluminum plate and the titanium plate to form a 3-5mm gap, and the pre-prepared through hole in S1 is riveted using a stainless steel rivet to achieve riveting pre-assembly of the assembly, and a composite plate blank is obtained;

[0010] Step S4, induction heating: the composite plate blank in step S3 is subjected to induction heating, the induction heating coil is a ring-shaped longitudinal magnetic induction heating coil, the coil is energized, the power is adjusted to ensure that the pure iron plate is heated to about 770℃ at the Curie point within 10-15s; the titanium plate and the steel plate are heated and warmed up by direct contact with the pure iron plate, while the thin aluminum plate and the titanium plate are further reduced in heating speed due to the addition of the titanium gasket with low thermal conductivity, so that the aluminum plate, the thin aluminum plate, the titanium plate, the pure iron plate and the steel plate can reach five different temperatures within the same heating time, and the composite plate blank is obtained by heating at different temperatures;

[0011] Step S5, rolling preparation: keep the heating power in S4, when the aluminum plate temperature is heated to 500-550℃ and the steel plate is about 770℃, push the composite plate blank in step S4 into the rolling mill through the push rod, roll in single pass, control the rolling reduction rate to be 30-40%, and get the aluminum-titanium-steel composite plate;

[0012] Step S6, cooling after rolling: the aluminum-titanium-steel composite plate after rolling is rapidly cooled to room temperature.

[0013] Further, the model of the aluminum plate is 5 series aluminum alloy; the thin aluminum plate is 6 series aluminum alloy; the titanium plate and the titanium gasket are TA1; the pure iron plate is DT4; and the steel plate is a steel plate with a magnetic aggregation effect.

[0014] Further, the specific process of step S2 is as follows: the composite surface of the aluminum plate is polished by an electric steel wire brush, the composite surfaces of the thin aluminum plate, the titanium plate, the pure iron plate and the steel plate are polished by a grinding machine, and then the composite surfaces after polishing are repeatedly cleaned with alcohol and acetone.

[0015] Further, in step S5, argon protective gas is introduced during induction heating and rolling preparation, and the roll speed is 100-200mm / s.

[0016] Further, in step S6, the cooling method is water cooling or oil cooling.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] Compared with the traditional explosive composite method for preparing the aluminum-titanium steel composite plate, the method for preparing the aluminum-titanium steel composite plate by the differential temperature rolling method has the advantages of small pollution, simplified process, simple process, convenient operation, and suitability for industrial large-scale production, and the aluminum-titanium steel composite plate prepared by the method has good interface bonding strength, good plate shape, and very high material yield. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the blanking of the method of the present application;

[0020] Figure 2 The figure is a schematic diagram of the blanking of the method of the present application.

[0021] In the figure, the reference numerals are as follows: 1, induction heating furnace; 2, roller; 3, track; 4, induction coil; 5, composite plate blank; 6, push rod; 7, electric control system; 8, stainless steel rivet; 9, steel plate; 10, aluminum plate; 11, pure iron plate; 12, titanium gasket; 13, titanium plate; 14, thin aluminum plate. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] The method for preparing the aluminum-titanium steel composite plate by the differential temperature rolling method, as shown in Figure 1 and 2 The specific implementation process is as follows:

[0024] Step S1, prepare corresponding aluminum plate, thin aluminum plate, titanium plate, pure iron plate and steel plate, and respectively drill holes: drill through holes in the same position of the aluminum plate, thin aluminum plate, titanium plate, pure iron plate and steel plate entering the end of the rolling mill; wherein, the model of the aluminum plate 10 is 5 series aluminum alloy; the model of the thin aluminum plate 14 is 6 series aluminum alloy; the model of the titanium plate 13 and the titanium gasket 12 is TA1; the model of the pure iron plate 11 is DT4; the steel plate 9 is a steel plate with magnetic aggregation effect.

[0025] Step S2, surface treatment: clean the oxides and oil stains on the surfaces of the aluminum plate 10, the thin aluminum plate 14, the titanium plate 13, the pure iron plate 11 and the steel plate 9 to be compounded in step S1; wherein the surface to be compounded of the aluminum plate 10 is polished by an electric steel wire brush, and the surfaces to be compounded of the thin aluminum plate 14, the titanium plate 13, the pure iron plate 11 and the steel plate 9 are polished by a grinding machine, and then the surfaces to be compounded of the aluminum plate 10, the thin aluminum plate 14, the titanium plate 13, the pure iron plate 11 and the steel plate 9 after polishing are repeatedly cleaned with alcohol and acetone.

[0026] Step S3, riveting pre-assembly: the assembly sequence is aluminum plate 10-thin aluminum plate 14-titanium plate 13-pure iron plate 11-steel plate 9, a titanium gasket 12 with holes is added between the aluminum plate 10 and the titanium plate 13 to form a gap of 3-5 mm, and the pre-assembled assembly is riveted by using the stainless steel rivets in the pre-prepared through hole in S1 to obtain a plate blank to be compounded;

[0027] The addition of the pure iron and aluminum alloy intermediate layer can cause a large shear deformation during rolling, offsetting part of the inconsistent deformation during the rolling of the aluminum-titanium-steel, thereby reducing the shear stress at the interface; in addition, the addition of the pure iron and aluminum alloy intermediate layer can also reduce the shear stress at the interface formed during the cooling process after rolling due to the inconsistent cooling shrinkage; thereby improving the bonding strength;

[0028] Step S4, induction heating: the plate blank to be compounded in step S3 is subjected to induction heating, the induction heating coil is a ring-shaped longitudinal magnetic induction heating coil, the coil is energized, the power is adjusted to ensure that the pure iron plate 11 is heated to about Curie point 770℃ for 10-15s; while the aluminum plate 10 and the titanium plate 13 cannot be rapidly heated in the magnetic field due to the lack of magnetic aggregation effect, the titanium plate 13 and the steel plate 9 are heated and warmed up by direct contact with the pure iron plate 11, and the heating speed between the aluminum plate 10 and the titanium plate 13 is further reduced due to the addition of the titanium gasket 12 with low thermal conductivity, therefore, in the same heating time, the aluminum plate 10, the thin aluminum plate 14, the titanium plate 13, the pure iron plate 11 and the steel plate 9 can reach five different temperatures, and the plate blank to be compounded is obtained by heating at different temperatures;

[0029] Step S5, rolling preparation: keep the heating power in S4, when the temperature of the aluminum plate 10 is heated to 500-550℃ and the temperature of the steel plate 9 is about 770℃, push the plate blank to be compounded in step S4 into the rolling mill by the push rod, roll it in a single pass, control the rolling reduction rate to be 30-40%, and obtain an aluminum-titanium-steel composite plate; argon protection gas is introduced during the rolling preparation, and the roller speed is 100-200mm / s.

[0030] Step S6, cooling after rolling: the aluminum-titanium-steel composite plate after rolling is rapidly cooled to room temperature; the cooling method is selected to be water cooling or air pump cooling.

[0031] The invention will be further illustrated below with specific examples:

[0032] like Figure 2 As shown, this example uses 5083 aluminum plate 10, 6061 thin aluminum plate 14, TA1 titanium plate 13, DT4 pure iron plate 11 and Q235 steel plate 9 for composite rolling.

[0033] Step S1: Drill holes in aluminum plate 10, thin aluminum plate 14, titanium plate 13, pure iron plate 11 and steel plate 9: Use a bench drill to drill through holes at the same position at the end of the rolling mill for the following plates: 5083 aluminum plate 10 with dimensions of 100×50mm and thickness of 5mm, Q235 steel plate 9, DT4 pure iron plate 11 with dimensions of 100×50mm and thickness of 0.3mm, TA1 titanium plate 13 with dimensions of 100×50mm and thickness of 1mm, and 6061 thin aluminum plate 14 with dimensions of 100×50mm and thickness of 0.5mm.

[0034] Step S2, Surface treatment: Use a wire brush to polish the 5083 aluminum plate 10 to remove oxides from the surface to be laminated. Use sandpaper to polish the TA1 thin aluminum plate 14, titanium plate 13, DT4 pure iron plate 11 and Q235 steel plate 9 to remove oxides from the surface to be laminated. Wipe the oil stains on the surface to be laminated clean with acetone and alcohol.

[0035] Step S3, Riveting Pre-assembly: The assembly sequence is as follows: 5083 aluminum plate 10 - 6061 thin aluminum plate 14 - TA1 titanium plate 13 - DT4 pure iron plate 11 - Q235 steel plate 9. The TA1 titanium plate 13 and DT4 pure iron plate 11 are placed in close contact, as are the DT4 pure iron plate 11 and steel plate 9. The 5083 aluminum plate 10 and 6061 thin aluminum plate 14 are placed in close contact. The 6061 thin aluminum plate 14 and TA1 titanium plate 13 are separated by a 4mm perforated titanium washer 12. The pre-drilled through holes in S1 are used to rivet the plates together with stainless steel rivets to achieve pre-assembly, resulting in the slab to be composited. Figure 2 As shown.

[0036] Step S4, Induction heating: such as Figure 1 As shown, the slab to be composited in step S3 is induction heated. The induction heating coil is a ring-shaped longitudinal magnetic induction heating coil 4. The coil is energized and the power is adjusted to ensure that the pure iron plate 11 and the steel plate 9 can be heated to the Curie point of 770°C in 10-15 seconds. The aluminum plate 10 and the titanium plate 13 cannot be rapidly heated in the magnetic field because they do not have a magnetic focusing effect. The titanium plate 12 can only be heated by direct heat transfer with the steel plate 9. The heating rate is further reduced between the thin aluminum plate 14 and the titanium plate 13 due to the addition of a titanium gasket 12 with a low thermal conductivity. Therefore, within the same heating time, the aluminum plate 10, the thin aluminum plate 14, the titanium plate 13, the pure iron plate 11 and the steel plate 9 can reach three different temperatures, thus obtaining the composite slab to be composited under heterogeneous heating. Argon gas is introduced as a protective gas during induction heating.

[0037] Step S5, rolling preparation: keeping the heating power in S4, when the temperature of the aluminum plate 10 is heated to 500-550℃ and the temperature of the steel plate 9 is about 770℃, the composite plate blank 5 is quickly pushed into the rolling mill by the push rod 6 through the track 3, the speed of the rolling mill 2 is 200mm / s, the reduction is 40%, argon protection gas is supplied during rolling, and the rolling of the aluminum-titanium-steel composite plate is realized.

[0038] Step S6, post-rolling cooling: the aluminum-titanium-steel composite plate after rolling is quickly cooled to room temperature.

[0039] The control deformation amount is 40%, the thickness of the composite plate after rolling is 6.91mm, the measured shear strength of the aluminum-titanium-steel composite plate is greater than 100MPa, the shear strength of the titanium-aluminum composite interface is greater than 220MPa, and the pure iron and the steel are combined into one body due to the close organization and performance.

[0040] The details of the present application are all known technologies.

[0041] The above-described embodiments are only used to describe the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A method for preparing aluminum-titanium-steel composite plates by differential temperature rolling, characterized in that: Includes the following steps: Step S1: Prepare the corresponding aluminum plates, thin aluminum plates, titanium plates, pure iron plates and steel plates, and perform drilling processing on them respectively: Drill through holes at the same position at the end of the aluminum plates, thin aluminum plates, titanium plates, pure iron plates and steel plates entering the rolling mill; Step S2, Surface treatment: Clean the oxides and oil stains from the surfaces of the aluminum plate, thin aluminum plate, titanium plate, pure iron plate and steel plate to be laminated obtained in step S1; Step S3, Riveting Pre-assembly: The assembly sequence is aluminum plate - thin aluminum plate - titanium plate - pure iron plate - steel plate. A perforated titanium gasket is added between the thin aluminum plate and the titanium plate to form a 3-5mm gap. The pre-made through holes in S1 are used to rivet the batch to achieve riveting pre-assembly, and the composite blank is obtained. Step S4, Induction Heating: The slab to be composited in Step S3 is induction heated. The induction heating coil is a ring-shaped longitudinal magnetic induction heating coil. The coil is energized and the power is adjusted to ensure that the pure iron plate is heated to the Curie point of about 770°C in 10-15 seconds. The titanium plate and the steel plate heat up through direct contact with the pure iron plate. The heating rate between the thin aluminum plate and the titanium plate is further reduced due to the addition of a titanium gasket with a low thermal conductivity. Therefore, within the same heating time, the aluminum plate, thin aluminum plate, titanium plate, pure iron plate and steel plate can reach five different temperatures, thus obtaining the composite slab to be composited with heterogeneous heating. Step S5, Rolling Preparation: Maintain the heating power in S4, and when the aluminum plate temperature reaches 500-550℃ and the steel plate temperature reaches about 770℃, push the composite slab from step S4 into the rolling mill through the push rod. Rolling is a single-pass rolling process, and the rolling reduction rate is controlled at 30-40% to obtain the aluminum-titanium-steel composite plate. Step S6, Post-rolling cooling: Rapidly cool the rolled aluminum-titanium steel composite plate to room temperature; The aluminum plate is a 5-series aluminum alloy; the thin aluminum plate is a 6-series aluminum alloy; the titanium plate and titanium gasket are TA1; the pure iron plate is DT4; and the steel plate is a steel plate with a magnetic focusing effect. The aluminum plate and steel plate are 5mm thick; the thin aluminum plate is 0.5mm thick; the titanium plate is 1mm thick; and the pure iron plate is 0.3mm thick.

2. The method for preparing aluminum-titanium steel composite plates by differential temperature rolling according to claim 1, characterized in that: The specific process of step S2 is as follows: the surface of the aluminum plate to be laminated is polished with an electric wire brush, and the surfaces of the thin aluminum plate, titanium plate, pure iron plate and steel plate to be laminated are polished with a grinding wheel. Then, the polished surfaces are repeatedly cleaned with alcohol and acetone.

3. The method for preparing aluminum-titanium steel composite plates by differential temperature rolling according to claim 1, characterized in that: In step S5, argon protective gas is introduced during induction heating and rolling preparation, and the roll speed is 100-200 mm / s.

4. The method for preparing aluminum-titanium steel composite plates by differential temperature rolling according to claim 1, characterized in that: In step S6, the cooling method is either water cooling or oil cooling.

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