A kind of inlaid composite metal structural plate strip, stamping part and its manufacturing method

Abstract

The present invention discloses an inlaid composite metal structural plate and strip material, a stamped part, and a manufacturing method thereof. The plate and strip material comprises a substrate and an inlay material, wherein the substrate and the inlay material are dissimilar metals. The two outer side surfaces and the lower end surface of the inlay material are inlaid in the substrate, forming a strong physical metallurgical bond at the interface between the inlay material and the substrate. The inlay material has a cross-section with a wide bottom and narrow top anti-slip structure. The plate and strip material is cut and stamped to produce a stamped part. A selective partial coating process is used to coat the substrate material at the lower end surface and two outer side surfaces of the metal strip to be embedded with the anti-slip structure, thereby producing an inlaid composite strip material with a preliminary bond between the metal strip to be embedded and the substrate. A densification process is used to form a dense and firmly bonded material structure at the interface between the inlay material and the strip material, thereby producing a densely bonded composite metal structural plate and strip material. The present invention fundamentally solves the current problem of unstable and unreliable peel strength between the interface between the substrate and the inlay material in inlaid composite materials.

Description

Technical Field

[0001] The present invention relates to the field of metal material technology, and specifically to an inlaid composite metal structural plate and strip material, a stamping part and a manufacturing method thereof. The metal parts made from the plate and strip material after precision forming such as stamping can be widely used in application fields such as batteries, electrical appliances, electronics, and machinery. Background Art

[0002] At present, metal parts with inlaid composite structures composed of two or more heterogeneous metals are often used in the application fields of batteries, electrical appliances, electronics, machinery, etc., such as square battery negative electrode covers, household appliance switch rockers, button battery solder legs, relay connection terminals, lead frames, micro motor commutators and brush polymers, etc. Most of them choose copper (or copper alloy) or aluminum (or aluminum alloy) as the base material, and the inlay material chooses a harder material than the base material (such as copper embedded in an aluminum base material) to meet the comprehensive optimization requirements in terms of conductivity, welding (connection), wear resistance, economy, etc. However, for some high-reliability application requirements (such as the automotive industry), the metal parts prepared by the above-mentioned inlaid composite materials are often difficult to promote and use because of the unstable or low bonding force (peel strength) between their components. The main reason for the unstable bonding force is actually the inherent process defects of the currently used inlaid rolling composite process, see Figure 1On the one hand, to ensure stable process parameters during the inlay rolling composite process, the addition of lubricant to the rolling deformation zone is essential. On the other hand, the addition of lubricant with low viscosity facilitates capillary action between the contacting sides of the inlay material and the substrate, allowing the lubricant to penetrate easily. However, given the inherently small width of the rollers 8 during the rolling process, it is difficult for the inlay material and the substrate, especially the contacting sides, to form a strong bond. Therefore, the inlay composite material produced using this preparation method suffers from unstable contact resistance and even quality risks such as inlay material detachment. Furthermore, current inlay rolling composite processes require that the inlay material be rectangular, which can be easily obtained by slitting wide strips. The appropriate groove profile for the inlay is determined by the feasibility of the groove forming process and the inlay rolling process itself. For continuous planing or milling of metal strips, rectangular grooves (or inverted trapezoids with a narrow top-width and bottom-width difference) facilitate the smooth discharge of metal chips generated by cutting. Otherwise, the accumulation of metal chips stuck in the groove will prevent the continuous grooving process. Furthermore, only rectangular grooves (or inverted trapezoids with a narrow top-width and bottom-width difference) ensure that the inlay is pressed smoothly into the groove and fully contacts the substrate. However, rectangular (or inverted trapezoids with a narrow top-width and bottom-width difference) inlays with a cross-section have a very limited composite contact surface with the substrate. This, coupled with the aforementioned difficulty in maintaining a stable bond between the contacting sides, makes it difficult to achieve a strong bond between the inlay and the substrate, making it difficult to ensure high-reliability applications.

[0003] As can be seen from the above, there is an urgent need to develop new mosaic composite structures and preparation methods thereof to meet the needs of high-reliability application technologies. Summary of the Invention

[0004] In order to fundamentally solve the problem of unstable and unreliable peeling strength between the bonding surface of the inlaid composite material substrate and the inlaid material, the present invention provides an inlaid composite metal structural plate strip, a stamping part and a manufacturing method thereof.

[0005] The present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a mosaic composite metal structural plate strip, the scheme is as follows:

[0007] A mosaic composite metal structural plate strip comprises a base material and an inlay, wherein the base material and the inlay are made of heterogeneous metals. The two outer side surfaces and the lower end surface of the inlay are inlaid in the base material, forming a strong physical metallurgical bond at the fitting interface between the inlay and the base material. The cross section of the inlay has an anti-slip structure that is wider at the bottom and narrower at the top.

[0008] The upper end surface of the inlay material is flush with the upper end surface of the base material.

[0009] Along the thickness direction of the base material, the anti-slip structure is a structure formed by two outer side surfaces of the inlay material and gradually narrows upwards.

[0010] The anti-slip structure is distributed over the entire cross-section area of the inlay material or a partial area of the entire cross-section.

[0011] The cross sections of the inlay materials are symmetrically arranged.

[0012] The thickness direction of the substrate is consistent with the thickness direction of the inlay material.

[0013] The cross section of the inlay material is one of an isosceles trapezoid, an inverted T-shape, an inverted trumpet shape, an I-shape, or a toothed structure on both sides.

[0014] The ratio of the minimum width of the upper portion of the anti-slip structure to the maximum width of the lower portion is 1.1 to 1.9.

[0015] The hardness of the base material is lower than that of the inlay material.

[0016] A stamping part of an inlaid composite metal structural plate is also provided. The stamping part is obtained by cutting and stamping the inlaid composite metal structural plate strip.

[0017] A method for manufacturing an inlaid composite metal structural plate strip is also provided, the method comprising the following steps:

[0018] Step 1: Prepare a metal strip to be embedded with a special-shaped cross-section, so that the two outer sides of the metal strip to be embedded have an anti-slip structure that is wider at the bottom and narrower at the top;

[0019] Step 2: Using a selective partial coating process, the substrate is coated at a certain temperature on the lower end surface and two outer side surfaces of the metal strip to be embedded, thereby producing an embedded composite strip with a preliminary bond between the metal strip to be embedded and the substrate;

[0020] Step 3: Using a densification process to form a dense and firmly bonded material structure between the initial bonding surfaces of the component metals of the inlaid composite strip obtained in step 2, so as to obtain a densely bonded composite metal structural plate strip.

[0021] In step 1, one process selected from extrusion, rolling, and drawing, or a combination of any two or three of these processes is used to ensure that the anti-slip structures formed on the two outer side surfaces of the formed metal strip to be embedded have a ratio of the upper minimum width to the lower maximum width of 1.1 to 1.9.

[0022] The selective partial coating process in step 2 adopts a tangential continuous extrusion or cast-rolling composite process. The base material used has good ductility or fluidity during the partial coating process, so that the deformation of the metal strip to be embedded after coating is less than 10%.

[0023] The densification process in step 3 is to densify the material structure between the initial bonding surfaces of the component metals of the inlaid composite strip by using a rolling process and / or a diffusion heat treatment process.

[0024] The technical solution of the present invention has the following advantages:

[0025] A. Compared to the rectangular bonding cross-sections of conventional mosaic composite materials, the complex cross-section of the special-shaped metal strip to be embedded employed in the present invention exhibits distinct convex and concave branching features. Thus, while maintaining the same inlay surface (exposed) width and total thickness as conventional inlay structures, the resulting inlay composite metal structure can significantly increase the contact area between the inlay and the substrate. This is one of the fundamental reasons why the present invention significantly improves bonding strength or peeling resistance compared to conventional inlay structures. The significant difference in upper and lower surface widths of the complex cross-section inlay designed in the present invention is intended to achieve the technical effect of significantly exceeding the exposed width of the inlay surface in the subsequent mosaic composite structure. This effect, in terms of structural design, significantly enhances the resistance to breakage and peeling between the inlay and the substrate along the entire thickness of the mosaic composite strip.

[0026] B. The present invention utilizes a selective partial coating process to produce a preliminarily bonded inlaid composite strip. The selective partial coating process employs extrusion or cast-rolling. During the partial coating process, the substrate exhibits excellent ductility or fluidity, while the coated strip exhibits no deformation or deformation of less than 10%. The width of the bottom surface where the inlay and substrate meet significantly exceeds the exposed width of the inlay. Furthermore, a densification process, combining rolling with a diffusion heat treatment process, can significantly enhance the densification of the material structure at the interface between the substrate and the inlay. This invention fundamentally addresses the current issue of unstable and unreliable peel strength between the substrate and the inlay in copper- or aluminum-based inlaid composite materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a simplified diagram of the composite process of inlaid composite metal under the current working roll lubrication condition;

[0029] Figure 2 Schematic cross-sectional view of a strip and a stamped part thereof according to a specific embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the strip to be embedded obtained in step S1 of Example 1 of the present invention;

[0031] Figure 4 Schematic diagram of selective coating using tangential continuous extrusion in step S2 of Example 1 of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the finished strip after cross-cutting according to Example 2 of the present invention;

[0033] Figure 6 This is a schematic structural diagram of an inverted trumpet-shaped inlay in a finished strip provided by the present invention;

[0034] Figure 7 This is a schematic structural diagram of the I-shaped inlay in the finished strip provided by the present invention;

[0035] Figure 8 This is a schematic structural diagram of the toothed inlay in the finished strip provided by the present invention.

[0036] Description of reference numerals:

[0037] 1-base material; 2-embedded material; 3-copper bar to be embedded; 4-aluminum rod; 5-inlet die; 6-extrusion wheel; 7-exit die; 8-shoe seat; 9-roller; a-anti-slip structure. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. It is obvious that the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0039] like Figure 2 As shown, the present invention provides an inlaid composite metal structural plate strip, comprising a substrate 1 and an inlay 2. The substrate 1 and inlay 2 are made of dissimilar metals. The two outer side surfaces and the lower end surface of the inlay 2 are inlaid in the substrate 1, forming a strong physical metallurgical bond at the interface between the inlay 2 and the substrate 1. The inlay 2 has a cross-section with an anti-slip structure a that is wider at the bottom and narrower at the top. The anti-slip structure a is provided on both sides of the inlay 2 to be bonded, ensuring a more secure bond between the inlay 2 and the substrate 1. In the figure, the width of the bottom surface of the inlay 2 where it contacts the substrate 1 is significantly greater than the exposed width of the inlay 2.

[0040] Preferably, the upper end surface of the inlay 2 is flush with the upper end surface of the substrate 1 and is located in combination with the substrate 1, and the upper end surface of the inlay 2 is exposed to the air. Of course, the upper end surface of the inlay 2 can also extend out of the substrate 1 or be lower than the upper end surface of the substrate 1, which will not be repeated here.

[0041] The present invention defines the anti-slip structure a. For example, the two outer side surfaces of the cross section of the inlay 2 form a structure that gradually narrows upwards. This structure can make it difficult for the inlay 2 to separate from the substrate 1. Of course, the cross section of the inlay 2 can also be an isosceles trapezoid, an inverted T-shape ( Figure 5 As shown), inverted trumpet ( Figure 6 As shown), I-shaped ( Figure 7 shown) or rodent (canine) shaped ( Figure 8 As shown in the figure, other special-shaped cross-sectional structures can also be used. As long as the two outer sides of the cross-sectional surface of the inlay 2 contain a lower-wide and upper-narrow anti-slip structure a, or a structure with a lower-wide and upper-narrow structure is partially formed, the purpose of the present invention can be achieved. Other special-shaped structures are not described here. For the cross-sectional surface of this anti-slip structure a, the ratio of the upper minimum width dimension to the lower maximum width dimension is preferably 1.1 to 1.9. Of course, for some special-shaped cross-sectional structures of the inlay 2, the upper end surface width and the lower end surface width of the inlay 2 can also be made equal, such as Figure 7 The similar I-beam structure shown, and Figure 8 In the toothed structure shown, the widths of the upper and lower ends of the cross section of the inlay 2 remain consistent.

[0042] More preferably, the inlay 2 is located in the middle of the width direction of the substrate 1. The thickness direction of the substrate 1 and the thickness direction of the inlay 2 are preferably kept consistent.

[0043] The present invention also provides a method for preparing the above-mentioned mosaic structure composite metal, which mainly comprises the following steps:

[0044] S1, preparing a metal strip to be embedded with a special-shaped cross-section, so that the two outer sides of the metal strip to be embedded have an anti-slip structure a that is wider at the bottom and narrower at the top;

[0045] S2, using a selective partial coating process to coat the substrate 1 at a certain temperature on the lower end surface and two outer side surfaces of the metal strip to be embedded, to produce an embedded composite strip with a preliminary bond between the metal strip to be embedded and the substrate;

[0046] S3, using a densification process to form a dense and firmly bonded material structure between the initial bonding surfaces of the component metals of the inlaid composite strip obtained in step S2, to obtain a densely bonded composite metal structural plate strip.

[0047] In the above manufacturing steps, step S1 uses one process among extrusion, rolling, and drawing, or a combination of any two processes, or a combination of all three processes to prepare a special-shaped metal bar to be embedded with a complex cross-section. The two outer side surfaces of the special-shaped metal bar to be embedded can be used as the anti-slip structure a as a whole. Of course, it is also possible to partially form the anti-slip structure a. Figure 3 The width of the upper and lower surfaces of the special-shaped metal strips to be embedded in the process is significantly different. In order to achieve the precise dimensional control requirements of the complex and special-shaped cross-section of the metal strips to be embedded in the composite inlay process, a reasonable process combination, profile mold design, and processing sequence arrangement requirements are all very necessary. Compared with the rectangular bonding cross-section of the mosaic structure composite material in the prior art, the complex cross-section of the special-shaped metal strip to be embedded used in the present invention has obvious convex and concave branching characteristics. Therefore, when the mosaic structure has the same mosaic surface (exposed) width and total mosaic thickness as the mosaic structure in the prior art, the mosaic composite metal structure produced by the present invention can significantly increase the contact area between the inlay material 2 and the substrate 1. This is one of the fundamental reasons why the present invention can significantly improve the bonding force or peeling strength compared with the prior art. It is also worth mentioning that the upper and lower surface widths of the inlay material 2 of the complex cross-section designed in the present invention are significantly different. This is to achieve the technical effect that in the subsequent mosaic composite structure, the bottom width of the contact bonding between the inlay material 2 and the substrate 1 is significantly greater than the exposed width of the inlay surface. This effect can greatly increase the anti-fracture and peeling effect of the inlay material 2 and the substrate 1 along the thickness direction of the entire mosaic composite plate strip in the structural design.

[0048] In step S2, a selective partial coating process is used to prepare a preliminarily bonded inlaid composite strip. The selective partial coating process adopts an extrusion or cast-rolling composite method, wherein the substrate has good ductility or fluidity during the partial coating process at a certain temperature, and the coated strip does not deform or deforms less than 10%. The bottom width of the inlay 2 in contact with the substrate 1 is significantly greater than the exposed width of the inlay 2.

[0049] When using the extrusion partial cladding process, it is necessary to ensure that the substrate 1 has good high-temperature deformability. Therefore, the extrusion temperature should be selected according to the high-temperature deformation characteristics of the substrate 1. The deformation temperature range where its deformation resistance is significantly reduced should also be selected to avoid the formation of intermetallic compounds between the inlay 2 and the substrate 1 due to high-temperature contact reaction and diffusion during the extrusion process.

[0050] In the selective casting and partial cladding process, the substrate 1 flows in liquid form over the solid inlay 2 in the casting deformation zone. Therefore, the substrate 1 should be below the melting point of the inlay 2, while also preventing the formation of harmful intermetallic compounds between the inlay 2 and the substrate 1 at this temperature. The inlay 2 remains unchanged or deforms less than 10% during the selective partial cladding process, ensuring precise control of the inlay's dimensions within the substrate 1, particularly its exposed apparent width.

[0051] The densification process employed in step S3 allows for the formation of a dense, firmly bonded material structure between the initial bonding surfaces of the component metals of the inlaid composite material obtained in step S2. At this point, the contact surfaces of the inlaid material 2 and the substrate 1 achieve a physical metallurgical bond, resulting in a significantly improved bonding force or peel strength compared to before densification. The densification process employed in the present invention is at least one of rolling and diffusion heat treatment. Generally speaking, step S2 is a thermal deformation process, and thus the overall dimensional accuracy of the resulting sheet or strip requires improvement. Step S3 essentially achieves densification while simultaneously obtaining an inlaid composite metal sheet or strip that meets the finished product dimensions (including inlaid positioning). The principle of selecting at least one of rolling and diffusion heat treatment processes for densification is that the component metals that are in contact with each other and initially bonded rapidly increase the contact area between the newly formed heterogeneous metals through the plastic deformation process of rolling. In addition to increasing the bonding strength of the heterogeneous metal interface between the two phases through atomic mutual diffusion, the diffusion heat treatment can also heal the pores or microcracks that may have existed in the initial bonding interface between the heterogeneous metals through sintering diffusion. A reasonable combination of rolling and diffusion heat treatment can double the densification effect of the material structure between the bonding interfaces.

[0052] After subsequent processing and stamping based on the above steps, a stamped part can be obtained. That is, a heterogeneous metal inlay 2 with a complex and irregular cross-section is provided in the base material 1 of the stamped part. Except for the exposed inlay surface, the other surfaces of the heterogeneous metal inlay 2 form a strong physical metallurgical bond with the base material 1. The width of the bottom surface of the inlay 2 in contact with the base material 1 is significantly greater than the exposed inlay width.

[0053] To facilitate manufacturing, the inlay material 2 is selected to have a material hardness greater than that of the substrate 1. This means that the relationship between the substrate 1 and the inlay material 2 is generally a soft-hard relationship: the inlay material 2 is hard, the substrate 1 is soft, and the substrate 1 is guaranteed to have excellent ductility or fluidity (note: above its melting point) at a certain temperature (note: generally within the material's hot working temperature range) to tightly envelop the inlay material 2. Therefore, in addition to the combination of copper inlay material 2 and aluminum substrate 1, many other similar combinations exist, requiring only that the inlay material 2 be hard and the substrate 1 be soft. For example, if the substrate 1 is copper, inlay material 2 harder than copper can include stainless steel, nickel, and the like. Softer metals such as copper, aluminum, silver, lead, tin, and magnesium, which are used in continuous extrusion, are suitable as the substrate 1. Accordingly, the inlay material 2 only needs to be a material that is correspondingly harder than the substrate 1.

[0054] Example 1

[0055] Reference Figure 2The cross-sectional diagram of the stamped part is used for the negative electrode cover of a power square battery. It is stamped from a composite metal structural plate strip. The strip is an aluminum (grade A1060) base inlaid with pure copper (C1100). The total width of the composite metal structural plate strip is 50mm and the total thickness is 3.0mm. The aluminum substrate 1 is aluminum and has reached the H18 state, while the inlay 2 is pure copper and has a Y2 (semi-hard state). Among them, the cross-section of the symmetrically inlaid pure copper inlay 2 is approximately an isosceles trapezoid. The exposed pure copper inlay 2 is 10mm wide, while the bottom surface of the pure copper inlay 2 (lower) combined with the corresponding aluminum substrate 1 is 16mm wide. The thickness of the pure copper inlay 2 (i.e., the height of the cross-section trapezoid) is 1.0mm. The preparation steps of this composite strip are as follows:

[0056] S1, using continuous extrusion and drawing method to prepare Figure 2 The material to be embedded is shown in the figure. The equipment used is an LJ250 single-wheel, single-slot continuous extruder (known as prior art). The raw material is an 11mm diameter, upward-drawn pure copper (C1100) rod. The die cavity temperature for continuous extrusion is approximately 500°C to 550°C, and the extrusion speed is 5m / min. The extrusion outlet produces a pure copper bar with an isosceles trapezoidal cross-section (with an upper width of 10.2mm, a lower width of 16.3mm, and a thickness of 2.7mm). This pure copper bar is cooled and straightened by a water seal at the outlet before being coiled. The coiled pure copper bar immediately enters a 10-ton linear drawing machine, where it is drawn to precise dimensions through a drawing die. The resulting copper material, ready for the next cladding process, has an isosceles trapezoidal cross-section with dimensions of 10.1mm at the top (surface), 16.1mm at the bottom (base), and 2.5mm in height (thickness).

[0057] S2, adopt Figure 4 The tangential continuous extruder shown selectively clads the copper bar 3 to be embedded, obtained in step S1. The cladding extrusion equipment used is an LJ400 continuous extruder, and the cladding material is a pure aluminum 1060 rod 4 with a diameter of 9.5 mm. The copper bar 3 to be embedded (with a narrow top and wide bottom cross-section) passes through the inlet die 5. The aluminum rod 4 billet, under the action of the extrusion wheel 6, enters the die cavity (the space formed by the inlet die 5, the outlet die 7, and the shoe 8). During the extrusion process, the aluminum metal selectively clads and forms a composite with the copper bar 3 to be embedded within the die cavity (the upper surface of the copper bar to be embedded is positioned at the same height as the top surface of the die). The maximum temperature in the deformation zone of the die cavity reaches 450°C, at which point the aluminum has excellent ductility. Under these temperature and aluminum cladding deformation and pressure conditions, the embedded copper bar remains dimensionalally unchanged, except for a slight plastic deformation (less than 5%) on its two sides (sides). After coating, it flows out through the outlet die to form a preliminary bonded aluminum-based inlaid (isosceles trapezoidal) copper composite strip with a total width of 51mm and a thickness of 6.5mm.

[0058] S3. A densification process comprising rolling and pre-finish annealing of the aluminum-based inlaid copper composite strip obtained in step S2, i.e., cold rolling the strip from 6.5 mm thick to 4.0 mm through four passes, followed by annealing heat treatment (setting the uniform temperature zone temperature at 500° C. and the annealing speed at 2 m / min). After heat treatment, repeated bending tests were performed to determine that each adjacent contact surface between the embedded copper material and the base aluminum had reached a dense integration level.

[0059] The composite material is then rolled in two passes to a finished product thickness of 3.0 mm, achieving a hardness that fully meets the customer's requirements. The strip is then degreased and cleaned before being precision-slit into strips to meet the customer's stamping requirements for overall strip width and copper positioning. Finally, the desired stamped parts are produced.

[0060] Peel strength testing of 100 randomly sampled finished composite strips revealed an average copper-aluminum bond strength exceeding 800 N / mm. All tearing occurred within the aluminum substrate, 10 to 12 mm away from the copper-aluminum interface. These results demonstrate that the inlaid composite metal strips and stamped parts produced by this invention fully meet the requirements for highly reliable power battery components in automotive applications.

[0061] Example 2

[0062] A heat sink for 5G. Figure 5 The inlaid composite structural plate and strip shown in the figure is obtained by stamping. The inlaid composite structural plate and strip require that the base aluminum (grade A1060) is in a wing-span T-shape that is wide at the top and narrow at the bottom, while the pure copper (C1100) inlaid in the aluminum base has an inverted "T" shape with a narrow top and a wide bottom in cross section (that is, the bottom width of the copper and aluminum combined is wider than the exposed copper). The span (total width) of the composite sheet is 60mm (the lower aluminum base is 30mm wide). The maximum thickness reaches 5.0mm (this area is approximately 30mm wide and extends symmetrically from the central axis), while the thinnest point is 1mm copper (this area is approximately 20mm wide and located symmetrically on either side). The cross-section of the symmetrically inlaid pure copper material is approximately an inverted "T" shape, with the exposed copper inlay being 15mm wide and the lower base where the copper and aluminum meet being 20mm wide. The thickest part (i.e., the section height) of the copper inlay is 2.5mm, and the thickness of the two edge wings is approximately 1.2mm. The aluminum in this composite sheet is in H18 condition, while the copper is in Y2 (semi-hard condition).

[0063] The production steps S1 and S2 of this composite sheet are substantially the same as those in Example 1, with only differences and adjustments in the specific raw material (copper and aluminum rod) dimensions and the extrusion and drawing die designs. Because the final product is a profiled bar, this example increases the extrusion ratio in step S2 (to 5.2, resulting in a 10% deformation of the inlay) and raises the extrusion temperature (reaching a maximum temperature of 520°C in the deformation zone of the die cavity). This optimizes the copper-aluminum bond strength achieved in step S2. This also significantly reduces the difficulty of the densification process in step S3. In step S3, a further small single-pass rolling (with a deformation rate of only 10%) is required to achieve the required thickness and hardness of the finished sheet. Subsequently, stress relief annealing is performed to eliminate residual stresses formed in previous steps, followed by stamping. This invention fundamentally addresses the current problem of unstable and unreliable peel strength between the substrate and the inlay of copper- or aluminum-based inlaid composite materials.

[0064] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A mosaic composite metal structural plate strip, characterized in that: The invention is obtained by three steps of preparing a special-shaped inlay, selectively partially coating the inlay (2) with a substrate, and densifying the substrate (1) and the inlay, comprising a substrate (1) and an inlay (2), wherein the substrate (1) and the inlay (2) are heterogeneous metals, the two outer side surfaces and the lower end surface of the inlay (2) are inlaid in the substrate (1), and a strong physical metallurgical bond is formed at the fitting interface between the inlay (2) and the substrate (1), and the cross section of the inlay (2) has an anti-slip structure (a) that is wider at the bottom and narrower at the top; The hardness of the material of the base material (1) is lower than the hardness of the material of the inlay material (2); The selective local coating process adopts a tangential continuous extrusion or cast-rolling composite process, and the base material (1) used has good ductility or fluidity during the local coating process, so that the deformation of the metal strip to be embedded after coating is less than 10%.

2. The inlaid composite metal structural plate strip according to claim 1, characterized in that: The upper end surface of the inlay material (2) is flush with the upper end surface of the base material (1).

3. The inlaid composite metal structural plate strip according to claim 2, characterized in that: Along the thickness direction of the base material (1), the anti-slip structure (a) is a structure formed by two outer side surfaces of the inlay material (2) and gradually narrowing upwards.

4. The inlaid composite metal structural plate strip according to claim 3, characterized in that: The anti-stripping structure (a) is distributed over the entire cross-sectional area of the inlay material (2) or a partial area of the entire cross-sectional area.

5. The inlaid composite metal structural plate strip according to any one of claims 1 to 4, characterized in that: The cross sections of the inlay material (2) are symmetrically arranged.

6. The inlaid composite metal structural plate strip according to claim 5, characterized in that: The thickness direction of the substrate (1) is consistent with the thickness direction of the inlay material (2).

7. The inlaid composite metal structural plate strip according to claim 6, characterized in that: The cross section of the inlay (2) is one of an isosceles trapezoid, an inverted T-shape, an inverted trumpet shape, an I-shape, or a toothed structure on both sides.

8. The inlaid composite metal structural plate strip according to claim 1, characterized in that: The ratio of the minimum width of the upper portion of the anti-slip structure (a) to the maximum width of the lower portion thereof is 1.1 to 1.

9.

9. A stamped part inlaid with a composite metal structural plate, characterized in that: The inlaid composite metal structural plate strip material of claim 1 is cut and punched to produce a punched part.

10. A method for manufacturing the inlaid composite metal structural plate strip according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Step 1: preparing a metal strip to be embedded with a special-shaped cross-section, so that the two outer sides of the metal strip to be embedded have an anti-slip structure that is wider at the bottom and narrower at the top (a); Step 2, using a selective local coating process to coat the base material (1) at a certain temperature on the lower end surface and two outer side surfaces of the metal strip to be embedded, so as to obtain an embedded composite strip with a preliminary bond between the metal strip to be embedded and the base material (1); the selective local coating process is a tangential continuous extrusion or cast-rolling composite process, and the base material (1) used has good ductility or fluidity during the local coating process, so that the deformation of the metal strip to be embedded after coating is less than 10%; Step 3: Using a densification process to form a dense and firmly bonded material structure between the initial bonding surfaces of the component metals of the inlaid composite strip obtained in step 2, so as to obtain a densely bonded composite metal structural plate strip.

11. The method for manufacturing an inlaid composite metal structural plate strip according to claim 10, characterized in that: In step 1, one process selected from extrusion, rolling, and drawing, or a combination of any two or three of these processes is used to ensure that the anti-slip structure (a) formed on the two outer side surfaces of the formed metal strip to be embedded has a ratio of the upper minimum width to the lower maximum width of 1.1 to 1.

9.

12. The method for manufacturing an inlaid composite metal structural plate strip according to claim 10, characterized in that: The densification process in step 3 is to densify the material structure between the initial bonding surfaces of the component metals of the inlaid composite strip by using a rolling process and / or a diffusion heat treatment process.

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