Dissimilar metal compounding method for rolling separation of corrugated roller and flat roller

Abstract

The invention provides a dissimilar metal compounding method for rolling separation of a corrugated roller and a flat roller, and relates to the technical field of metal composite plate preparation. The method comprises the steps that firstly, a corrugated roller is used for rolling a base material, and the corrugation morphology is accurately transferred; then pollutants and oxide layers on the surfaces of the corrugated plate and the covering plate are removed; oppositely assembling the corrugated characteristic surface of the base plate and the flat and straight surface of the covering plate after surface treatment to form a to-be-compounded blank; and finally, the composite blank is rolled through a flat roller in a one-pass or multi-pass mode, and the dissimilar metal composite plate is obtained. According to the method, the surface corrugation characteristics of the base material are prefabricated through the roller, flat roller composite rolling is conducted after dissimilar metal assembly, and the phenomena that deformation and impermeability are caused by the thickness and hardness influence of a covering material when the corrugation form is conducted to a composite interface through direct corrugation rolling of the combined blank, and the interface corrugation characteristics are not obvious are avoided; and the interface bonding area and the bonding strength can be obviously increased.

Description

Technical Field

[0001] The present invention relates to the technical field of metal composite plate preparation, and particularly to a method for composite of dissimilar metals by separating corrugated roll and flat roll rolling. Background Art

[0002] The traditional preparation method of titanium / steel composite plate is mainly planar rolling composite. The interfacial bonding of this process mainly relies on a large rolling reduction, and there are problems such as difficulty in extending the metal surfaces on both sides of the interface and low bonding strength. Existing research shows that the strength of the corrugated bonding interface generated by the explosion composite method is significantly higher than that of the flat interface. The periodic concave-convex structure of the corrugated interface can effectively increase the interfacial contact area, play a role in regulating the interfacial stress distribution and promoting metallurgical mechanical bonding.

[0003] At present, for the composite rolling process of the corrugated interface, most are to print corrugations on the surface of the composite slab blank, and conduct the corrugation characteristics to the composite interface through flat roll rolling. The transfer forming of this process is limited by the thickness of the sheet material, and it is difficult to process large-thickness corrugated interface composite plates (CN201810711027.X). Or corrugated morphologies are printed on both sides of the interface to be composite, and defects such as surface folding are likely to occur during flat rolling (CN202110316951.X).

[0004] Therefore, the present invention proposes a method for composite of dissimilar metals by separating corrugated roll and flat roll rolling, which effectively improves the surface quality of the finished material and the interfacial bonding strength. Summary of the Invention

[0005] In order to solve the above technical problems existing in the prior art, the embodiments of the present invention provide a method for composite of dissimilar metals by separating corrugated roll and flat roll rolling, which can effectively improve the surface quality of the composite plate and the interfacial bonding strength. The technical solution is as follows:

[0006] A method for composite of dissimilar metals by separating corrugated roll and flat roll rolling, the method comprising:

[0007] S1. Using a corrugated roll with a designed corrugated morphology to roll a base material blank to obtain a base material corrugated plate;

[0008] S2. Performing surface treatment on the surfaces of the base material corrugated plate and the clad plate to remove surface contamination and oxide layers;

[0009] S3. Grouping the base material corrugated plate and the clad plate to form a blank to be composite;

[0010] S4. Using a flat roll to perform rolling composite on the composite blank in different passes to obtain a dissimilar metal composite plate.

[0011] In the step S1, the corrugated structure includes transverse corrugations and longitudinal corrugations, the corrugation depth is 0.8 - 5 mm, and the crest pitch is 2.0 - 8.0 mm.

[0012] The rolling includes cold rolling, warm rolling or hot rolling. Among them, hot rolling or warm rolling is selected for the steel-based composite material, and cold rolling or warm rolling is selected for the aluminum-based composite material.

[0013] In the step S3, a transition layer material is added at the bonding interface between the substrate corrugated plate and the cladding plate, and the thickness of the transition layer material is 0.01 - 1 mm. Generally, industrial pure Fe, IF steel, stainless steel, Ni, Nb, high-entropy alloy, etc. are used as the transition layer material for titanium / steel composite plates; Ti and Cu are generally used as the transition layer material for titanium / aluminum composite plates.

[0014] In the step S4, the rolls used for rolling the composite billet are flat rolls, and the rolling deformation temperature is determined to use cold rolling, warm rolling or hot rolling according to the processing plasticity and the easy composite temperature range. For example, when using copper-aluminum materials, cold rolling is carried out at room temperature; when using steel-aluminum or titanium-aluminum materials, warm rolling is carried out in the range of 300 - 600 °C. When both are high deformation resistance materials such as titanium and steel, hot rolling is carried out above 700 °C.

[0015] In the step S4, when the difference in deformation resistance between the substrate corrugated plate and the cladding plate is greater than 30%, rolling at different temperatures can be adopted.

[0016] In the step S4, for the composite billet that needs to be hot rolled, after the composite billet is assembled, it is welded and sealed, and vacuum is pumped to prevent oxidation of the surface of the billet to be composite bonded.

[0017] In the step S4, the rolling composite passes are the conventional rolling passes of the substrate.

[0018] In the step S1, during the corrugated rolling process, single-piece rolling or double-layer symmetric rolling is adopted according to needs. When double-layer symmetric rolling is adopted, an isolating agent is added between the two substrate billets. Generally, the isolating agent is required to have high chemical stability, high-temperature stability and anti-friction characteristics, such as BN isolating agent or MgO.

[0019] The beneficial effects brought by the technical solution provided by the embodiment of the present invention at least include:

[0020] In the above solution, by prefabricating the surface corrugation characteristics of the substrate with rolls and then performing flat roll composite rolling after assembling different metals, it is possible to avoid the phenomenon that when the corrugation form is conducted to the composite interface during the direct corrugated rolling of the combined billet, the deformation is not permeable due to the influence of the cladding thickness and hardness, and the corrugation characteristics at the interface are not obvious, and the interface bonding area and bonding strength can be significantly increased. In addition, the present invention has no limitation on the material thickness, and dissimilar metal composite plates with larger specifications, higher strength and hardness can be prepared. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a process schematic diagram of a dissimilar metal composite method for separating corrugated roll and flat roll rolling provided by an embodiment of the present invention;

[0023] Figure 2 It is the interfacial morphology of the titanium / steel composite plate prepared by composite rolling in Embodiment 1 of the present invention;

[0024] Figure 3 It is the interfacial morphology of the aluminum / titanium / steel composite plate prepared by composite rolling in Embodiment 2 of the present invention.

[0025] Wherein: 1 - corrugated roll; 2 - base material blank; 3 - separating agent; 4 - clad plate; 5 - flat roll; 6 - dissimilar metal composite plate. Specific Embodiments

[0026] The following will describe the technical solutions in the present invention with reference to the drawings.

[0027] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Precisely, the use of the word "example" is intended to present concepts in a specific manner. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one of the two can be selected.

[0028] To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0029] The embodiments of the present invention provide a dissimilar metal composite method for separating corrugated roll and flat roll rolling. As Figure 1 shown in the flow chart of the dissimilar metal composite method for separating corrugated roll and flat roll rolling, the method may include the following steps:

[0030] S1. Use the corrugated roll 1 with a designed corrugated morphology to roll the base material blank 2 to obtain a base material corrugated plate; if double-sided symmetric rolling is performed, a separating agent 3 is added between the two base material blanks to prepare a single-sided composite plate;

[0031] S2. Perform surface treatment on the surfaces of the base material corrugated plate and the clad plate 4 to remove surface contamination and oxide layers;

[0032] S3. Form a blank to be composite by combining the base corrugated plate and the cladding plate 4;

[0033] S4. Use a flat roll 5 to perform rolling composite on the composite blank in different passes to obtain a dissimilar metal composite plate 6.

[0034] The following is illustrated with specific embodiments.

[0035] Embodiment 1

[0036] Prepare a titanium / steel composite plate with a thickness of 10 mm by wave-flat separation rolling. The specific preparation steps are as follows:

[0037] On a 355D steel plate with a thickness of 25 mm at 700 1200 Pre-print the corrugated morphology; combine it with a TA1 blank with a thickness of 10 mm at 680 1200 Form a composite blank of steel-titanium-titanium-steel with a size of 700 1200 70 mm by using a symmetric blank combination method; spray a release agent on the titanium-titanium bonding interface; use a 10-mm-thick edge sealing strip to weld and seal the steel plates above and below the blank combination; the internal vacuum degree of the blank combination is less than 10 -3 Pa; the heating temperature of the blank combination is 930 °C, the cumulative hot rolling compression ratio is 70%, and the final rolling temperature is 760 - 800 °C. Roll from a thickness of 70 mm to a thickness of 20 mm; straighten and trim the edges after rolling, and separate. Obtain two titanium / steel composite plates with a size of 700 4000 10 mm specifications.

[0038] The interface morphology of the composite plate after rolling is shown in Figure 2 , the interface characteristics are good, and the interface bonding strength is 275 MPa.

[0039] Embodiment 2

[0040] The present invention can further perform composite on the basis of the composite plate. For example, taking the titanium / steel composite plate as the base material, further composite aluminum to prepare a titanium / steel / aluminum composite plate.

[0041] Prepare a 10-mm-thick aluminum / titanium / steel composite plate by wave-flat separation rolling. The specific preparation steps are as follows:

[0042] On the 10-mm-thick titanium / steel composite plate prepared in Embodiment 1, take 100 60 10-mm titanium / steel composite plates; prepare another 100 60 5mm 6061 aluminum alloy is used as the cladding layer; the heating temperature of the titanium-steel composite plate is 350 °C, the heating temperature of the 6061 aluminum alloy is 100 °C, and the cumulative rolling reduction rate is 40%. It is rolled from a thickness of 15mm to a thickness of 10mm. Through the above steps, a 160 60 aluminum / titanium / steel composite plate with a thickness of 10mm.

[0043] The interfacial morphology of the composite plate after rolling is shown in Figure 3 , the interfacial characteristics are good, and the interfacial bonding strength is 153 MPa.

[0044] However, in the implementation results disclosed in the prior art, such as in ZL202110316951.X, a corrugated morphology is pre-printed on the surface to be bonded of the Mg / AL plate, and through rolling, a Mg / Al composite plate with a thickness specification of 2 mm is obtained, and the interfacial bonding strength is 38 MPa; in ZL201810711027.X, a corrugated morphology is pre-printed on the upper surface of the carbon steel / stainless steel plate blank, and through rolling, the corrugated interface is conducted to the interface, and a carbon steel / stainless steel composite plate with a thickness specification of 3 mm is obtained, and the interfacial bonding strength is 91 MPa.

[0045] Obviously, compared with the prior art disclosure, the embodiments of the present invention can prepare dissimilar metal composite plates with larger specifications, higher strength and hardness.

[0046] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A method for cladding dissimilar metals by rolling and separating corrugated rolls and flat rolls, characterized in that: The method comprises: S1, using a corrugated roller designed with a corrugated morphology to roll the base material blank to obtain a base material corrugated plate; S2. Surface treatment is performed on the surface of the base corrugated plate and the cladding plate to remove surface pollution and oxidation layer; S3, assembling the base corrugated plate and the covering plate into a blank to be composited; S4. The composite blank is rolled and composited with a flat roller in different passes to obtain a heterogeneous metal composite plate.

2. The method for compositing dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: In step S1, the corrugated structure includes transverse corrugations and longitudinal corrugations, the corrugation depth is 0.8-5 mm, and the crest spacing is 2.0-8.0 mm.

3. The method for cladding dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: The rolling includes cold rolling, warm rolling or hot rolling, wherein the steel-based composite material is hot rolled or warm rolled, and the aluminum-based composite material is cold rolled or warm rolled.

4. The method for compositing dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: In the step S3, a transition layer material is added to the interface between the base corrugated plate and the cover plate, and the thickness of the transition layer material is 0.01-1 mm.

5. The method for compositing dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: The rollers used for rolling the composite billet in step S4 are flat rollers.

6. The method for cladding dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: When the deformation resistance of the base corrugated plate and the cladding plate differs by more than 30% in step S4, rolling is performed at different temperatures.

7. The method for cladding dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: In the step S4, for the composite blanks that need to be hot-rolled, the composite blanks are assembled, welded and sealed, and vacuumed to prevent oxidation of the surface of the blanks to be composited.

8. The method for compositing dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: The composite rolling pass in step S4 is a conventional rolling pass for the substrate.

9. The method for cladding dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 1, characterized in that: In the corrugation rolling process in step S1, single-piece rolling or double-layer symmetrical rolling is adopted as required. When double-layer symmetrical rolling is adopted, an isolation agent is added between two base material blanks.

10. The method for cladding dissimilar metals by rolling separation of corrugated rolls and flat rolls according to claim 9, characterized in that: The separator is BN or MgO.

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