Forming apparatus and forming process for a bimetallic composite profile

Abstract

The application discloses a forming device and forming process of a bimetal composite profile, relates to the technical field of machining, and comprises a bimetal composite extrusion forming unit, an electric auxiliary online heat treatment unit, a guide unit and a roller pressure forming unit. The bimetal composite extrusion forming unit comprises a die structure, the die structure is used for forming a bimetal composite plate with a non-flat joint interface, the guide unit guides the bimetal composite plate, the roller pressure forming unit roller-presses the bimetal composite plate, and the electric auxiliary online heat treatment unit heat-treats the bimetal composite plate. The forming process comprises a production preparation stage, bimetal composite plate extrusion and combination with a special-shaped joint interface, continuous roller pressure forming and heat treatment. On the basis of improving the quality of the composite profile and enhancing the joint interface strength, the application greatly improves the production efficiency and expands the application range of the special-shaped cross-section composite profile.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a forming equipment and forming process for bimetallic composite profiles. Background Technology

[0002] With the rapid development of science and technology and modern industry, single-component materials are insufficient to meet the requirements for comprehensive material performance. New composite materials, which combine the physical, chemical, and mechanical properties of different materials, have emerged. Among these, metal layered composite materials made of two or more metals with different properties are becoming increasingly widespread in terms of variety and application. Through appropriate combination, metal layered composite materials can significantly improve many properties of single metal materials, such as strength, thermal expansion, impact toughness, wear resistance, and electrical properties.

[0003] Composite profiles are a new type of lightweight structural material, but their production and preparation are limited in many ways. Currently, the bonding interface of bimetallic composite sheets is mostly a flat interface, and due to differences in compound formation and deformation mechanisms during preparation, problems such as delamination and cracking occur, resulting in poor interfacial bonding and affecting secondary processing and performance. During the rolling process of composite sheets, to avoid defects, strict control of rolling temperature, roll type, and pass rate is required, necessitating multiple intermediate annealing processes before rolling, making the process quite cumbersome. Currently, the main method for preparing composite profiles is to obtain sheets with irregular interfaces through machining and material surface treatment, and then extrude and roll them to obtain the composite profile. This leads to surface oxidation and other problems during repeated disassembly and assembly of the composite sheet, resulting in a complex manufacturing process, long production cycle, and low production efficiency. Existing bimetallic composite sheet manufacturing processes either suffer from poor interfacial bonding or are complex and costly, resulting in very few commercially available bimetallic composites of other composite components, except for relatively easy copper / aluminum and copper / steel composites. Summary of the Invention

[0004] The purpose of this invention is to provide a forming equipment and forming process for bimetallic composite profiles, so as to solve the problems existing in the prior art, improve the quality of composite profiles, enhance the interfacial bonding strength, improve production efficiency, and expand the application range of irregular cross-section composite profiles.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a forming device for bimetallic composite profiles, including a bimetallic composite extrusion forming unit, an electrically assisted online heat treatment unit, a guiding unit, and a roll forming unit. The bimetallic composite extrusion forming unit includes a mold structure for forming a bimetallic composite sheet with a non-flat bonding interface. One end of the guiding unit is disposed near the bimetallic composite extrusion forming unit, and the other end of the guiding unit is disposed near the roll forming unit. The guiding unit guides the bimetallic composite sheet, the roll forming unit rolls the bimetallic composite sheet, and the electrically assisted online heat treatment unit heats the bimetallic composite sheet.

[0007] Preferably, the bimetallic composite extrusion forming unit further includes a first support, a second support, a movable support, a tension column, a main working cylinder, a return cylinder, and two extrusion shafts. The two ends of the tension column are respectively connected to the first support and the second support. The movable support is disposed between the first support and the second support and is slidably connected to the tension column. The first support is provided with a through hole, and one end of the mold structure extends into the through hole. Both extrusion shafts are disposed on the movable support. The cylinder body of the main working cylinder and the cylinder body of the return cylinder are both disposed on the second support. The piston end of the main working cylinder and the piston end of the return cylinder are both connected to the movable support. The two extrusion shafts can respectively extend into the mold structure to extrude the blank to form a bimetallic composite sheet with a non-straight bonding interface.

[0008] Preferably, the main working cylinder and the return cylinder share a common oil tank, the return cylinder is a single-rod double-acting piston cylinder, and the main working cylinder moves forward by being pushed by the return cylinder.

[0009] Preferably, the mold structure includes an extrusion cylinder, opposing extrusion channels, a wedge block, a progressive thinning extrusion deformation band, and a forming nozzle. The shape of the wedge block corresponds to the non-straight joint interface. The extrusion cylinder is connected to the first support. The extrusion cylinder is provided with a first loading chamber and a second loading chamber, which are respectively used to place metal billets. The first loading chamber and the second loading chamber are respectively corresponding to an extrusion shaft. The wedge block is located at the center of the front end of the extrusion cylinder. The mold and the forming nozzle are both located at the front end of the extrusion cylinder, and the wedge block, the mold, and the forming nozzle are arranged sequentially from the inside to the outside. The space between the two sides of the wedge block and the mold forms two opposing extrusion channels. One opposing extrusion channel communicates with the first loading chamber, and the other opposing extrusion channel communicates with the second loading chamber. The first outlet on the mold and the second outlet of the forming nozzle form the progressive thinning extrusion deformation band, which communicates with the two opposing extrusion channels.

[0010] Preferably, the roll forming unit includes a support roll, a roll forming roll, and a roll support. The support roll and the roll forming roll are both disposed on the roll support. The support roll supports the roll forming roll, and the bimetallic composite sheet is located between two opposing roll forming rolls.

[0011] Preferably, the guiding unit includes a limiting plate and a plurality of guide rollers, the limiting plate being disposed above the plurality of guide rollers.

[0012] Preferably, the forming equipment for the bimetallic composite profile further includes a key-locking cylinder, the cylinder body of which is fixed on the first bracket, and the piston end of which is used to fix the mold structure.

[0013] Preferably, the forming equipment for the bimetallic composite profile further includes an atmosphere protection unit, which includes a housing, an inlet pipe, an outlet pipe, and a regulating valve. The bimetallic composite extrusion forming unit, the electrically assisted online heat treatment unit, the guiding unit, and the roll forming unit are all located in the housing. The inlet pipe and the outlet pipe are both connected to the housing, and the regulating valve is disposed on the inlet pipe.

[0014] This invention also discloses a forming process using a forming device for the aforementioned bimetallic composite profile, comprising the following steps:

[0015] Step 1: Install the wedge blocks according to production requirements;

[0016] Step 2: The billet is extruded through a bimetallic composite extrusion forming unit to obtain a bimetallic composite sheet with a non-straight bonding interface.

[0017] Step 3: The bimetallic composite plate is heat-treated using an electrically assisted online heat treatment unit;

[0018] Step four: The heat-treated bimetallic composite sheet is conveyed to the roll forming unit. According to the cross-sectional shape of the final bimetallic composite profile, the bimetallic composite sheet is roll formed to obtain the bimetallic composite profile.

[0019] This invention also discloses a forming process using a forming device for the aforementioned bimetallic composite profile, comprising the following steps:

[0020] Step 1: Install the wedge blocks according to production requirements;

[0021] Step 2: The billet is extruded through a bimetallic composite extrusion forming unit to obtain a bimetallic composite sheet with a non-straight bonding interface.

[0022] Step 3: The bimetallic composite sheet is conveyed to the roll forming unit, and the bimetallic composite sheet is roll formed according to the cross-sectional shape of the final bimetallic composite profile.

[0023] Step four: The bimetallic composite sheet is heat-treated by an electric-assisted online heat treatment unit to obtain a bimetallic composite profile.

[0024] The present invention achieves the following technical effects compared to the prior art:

[0025] This invention integrates extrusion compounding, online heat treatment for performance enhancement, and roll forming. By strengthening the metallurgical bond at the interface of the bimetallic composite sheet through a bimetallic composite extrusion forming unit, it achieves the forming of bimetallic composite sheets with irregular cross-sections, thereby obtaining bimetallic composite profiles with excellent comprehensive mechanical properties. This invention significantly improves production efficiency and expands the application range of irregular cross-section composite profiles while improving the quality of composite profiles and enhancing interfacial bonding strength. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a front view of the forming equipment for the bimetallic composite profile of the present invention;

[0028] Figure 2 for Figure 1 A partial enlarged view of the intermediate roll and the support roll;

[0029] Figure 3 This is a top view of the forming equipment for the bimetallic composite profile of the present invention;

[0030] Figure 4 for Figure 1 AA section view;

[0031] Figure 5 This is a cross-sectional view of the mold of the present invention;

[0032] Figure 6 This is a front view of the locking cylinder of the present invention;

[0033] Figure 7 This is a cross-sectional view of the locking cylinder of the present invention;

[0034] Figure 8 This is a schematic diagram of the forming process in Example 2;

[0035] Figure 9This is a schematic diagram of the forming process in Example 3;

[0036] Among them: 100-forming equipment for bimetallic composite profiles, 1-roll forming unit, 2-limiting plate, 3-guide roller, 4-first support, 5-moving support, 6-second support, 7-main working cylinder, 8-tension column, 9-locking cylinder, 10-extrusion shaft, 11-extrusion cylinder, 12-wedge block, 13-mold, 14-first machine base, 15-moving beam machine base, 16-second machine base, 17-return cylinder, 18-moving platform, 19-mold support, 20-forming nozzle, 21-electrically assisted online heat treatment unit, 22-mold structure, 23-opposing extrusion channel, 24-progressive thinning extrusion deformation band, 25-roller, 26-support roller. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The purpose of this invention is to provide a forming equipment and forming process for bimetallic composite profiles, so as to solve the problems existing in the prior art, improve the quality of composite profiles, enhance the interfacial bonding strength, improve production efficiency, and expand the application range of irregular cross-section composite profiles.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] like Figures 1-7 As shown: This embodiment provides a forming equipment 100 for bimetallic composite profiles, used for forming bimetallic composite profiles, including a bimetallic composite extrusion forming unit, an electrically assisted online heat treatment unit 21, a guiding unit, and a roll forming unit 1; the guiding unit and the roll forming unit 1 are arranged on a moving platform 18, the bimetallic composite extrusion forming unit includes a mold structure 22, the mold structure 22 is used to form a bimetallic composite sheet with a non-flat joint interface, one end of the guiding unit is arranged close to the bimetallic composite extrusion forming unit, and the other end of the guiding unit is arranged close to the roll forming unit 1, the guiding unit guides the bimetallic composite sheet, the roll forming unit 1 rolls the bimetallic composite sheet, and the electrically assisted online heat treatment unit 21 heats the bimetallic composite sheet.

[0042] In this embodiment, the pulsed power supply output of the electrically assisted online heat treatment unit 21 applies the current uniformly to the bimetallic composite sheet, achieving heat treatment of the bimetallic composite sheet. The electrically assisted online heat treatment unit 21 can be arranged before or after the roll forming unit 1, depending on the material characteristics and forming parameters of the bimetallic composite profile. When the sheet extrusion bonding is a cold working process, the electrically assisted online heat treatment unit 21 performs annealing treatment before roll forming, using a large current and short duration (pulse frequency of 140 Hz, pulse width of 70 μs, and current density of 3.78 × 10⁻⁶). 8 A / m 2 Annealing for 7 seconds removes work hardening; extrusion lamination of sheet metal is a hot process, and the temperature of the deformed material after extrusion lamination can ensure that the bimetallic composite sheet can achieve multi-pass continuous roll forming deformation. Therefore, the electric-assisted online heat treatment unit 21 is a strengthening heat treatment (such as aging heat treatment), which is carried out after roll forming deformation. It uses a large current and short time (pulse frequency of 1000 Hz, pulse width of 120 μs, and current density of 1.34 × 10⁻⁶). 8 A / m 2 Annealing for 500 seconds (to improve strength).

[0043] In this embodiment, the bimetallic composite extrusion forming unit further includes a first support 4, a second support 6, a movable support 5, tension columns 8, a main working cylinder 7, a return cylinder 17, and two extrusion shafts 10. The movable platform 18 is connected to the forming nozzle 20 of the mold structure 22 by bolts. The first support 4 is mounted on the first base 14, the second support 6 is mounted on the second base 16, and the movable support 5 is mounted on the moving beam base 15. There are six tension columns 8 arranged symmetrically, and each tension column 8 has threads at both ends. The two ends of each tension column 8 are located in the mounting holes of the first support 4 and the second support 6, and are fixed by nuts. The movable support 5 is mounted on the first support 4 and the second support 6. Between the frames 6, the movable support 5 and the tension column 8 are slidably connected. The first support 4 is provided with a through hole. One end of the mold structure 22 extends into the through hole. The right ends of the two extrusion shafts 10 are respectively fixed to the movable support 5 by nut assemblies. Specifically, the pressing block and the extrusion shaft 10 are in inclined contact. The extrusion shaft 10 is fixed and pressed by tightening the nut assembly. The cylinder body of the main working cylinder 7 and the cylinder body of the return cylinder 17 are both set on the second support 6. The piston end of the main working cylinder 7 and the piston end of the return cylinder 17 are both connected to the movable support 5. The two extrusion shafts 10 can respectively extend into the mold structure 22 to extrude the blank to form a bimetallic composite plate with a non-straight joint interface.

[0044] In this embodiment, the main working cylinder 7 adopts a plunger-type structure. The moving support 5 reciprocates along the length of the tension column 8 under the drive of the main working cylinder 7. The main working cylinder 7 drives the extrusion shaft 10 to achieve bimetallic extrusion composite forming. Return cylinders 17 are respectively located on both sides of the main working cylinder 7. The main working cylinder 7 and the return cylinder 17 share a common oil tank. The main plunger is pushed forward by the return cylinder 17, and the movement of the main working cylinder 7 is achieved through the movement of the return cylinder 17. The return cylinder 17 pushes the main working cylinder 7 to move, thereby achieving extrusion composite forming.

[0045] In this embodiment, the mold structure 22 includes a wedge block 12, an extrusion cylinder 11, a mold 13, a mold support 19, a forming nozzle 20, opposing extrusion channels 23, and a progressive thinning extrusion deformation band 24. The shape of the wedge block 12 corresponds to the non-straight joint interface. The mold support 19 is used to ensure that the mold 13 and the extrusion cylinder 11 are concentric. The forming nozzle 20 ensures that the mold 13 does not shift during the extrusion process and fits tightly with the extrusion cylinder 11. The extrusion cylinder 11 is located on the right side of the mold 13 and is fixed in the through hole of the first bracket 4 by a nut assembly and an end cap. The extrusion cylinder 11 is connected to the first bracket 4 by bolts. The extrusion cylinder 11 is provided with a first loading chamber and a second loading chamber. The first loading chamber and the second loading chamber are respectively used to place metal billets. The first loading chamber and the second loading chamber are respectively connected to a... Corresponding to the extrusion shaft 10, the wedge block 12 is located at the center of the front end of the extrusion cylinder 11. The wedge block 12 and the extrusion cylinder 11 are embeddedly connected, which is convenient for disassembly and replacement with wedge blocks 12 of different shapes. The mold 13 and the forming nozzle 20 are both located at the front end of the extrusion cylinder 11, and the wedge block 12, the mold 13 and the forming nozzle 20 are arranged sequentially from the inside to the outside. The space between the two sides of the wedge block 12 and the mold 13 respectively forms two opposing extrusion channels 23. One opposing extrusion channel 23 is connected to the first loading chamber, and the other opposing extrusion channel 23 is connected to the second loading chamber. The first outlet on the mold 13 and the second outlet of the forming nozzle 20 form a progressively thinning extrusion deformation band 24, which is connected to the two opposing extrusion channels 23. Two extrusion shafts 10 extrude the metal billets in the first and second loading chambers. The bimetallic billets first flow in opposite directions within their respective opposing extrusion channels 23. Then, after flowing through the wedge block 12, the bimetallic billets merge to form a non-straight bonding interface, which enhances the interfacial bonding strength of the sheet. Finally, the bonded bimetallic billets pass sequentially through a progressively thinning extrusion deformation zone 24 to form a metallurgically bonded bimetallic composite sheet with a non-straight bonding interface. Due to the opposing compressive stress generated during the progressive extrusion thinning process, the bonding force between the composite sheet interfaces can be further enhanced. Simultaneously, it can effectively refine the grains and improve the mechanical properties of the bimetallic composite sheet. The die structure 22 enables the continuous formation and contact matching of bimetallic irregular interfaces, ultimately obtaining an extruded bimetallic composite sheet with an irregular bonding interface. Due to the increased interface contact area and the triaxial compressive stress state of the extrusion, the interfacial metallurgical bonding of the bimetallic composite sheet is strengthened.

[0046] In this embodiment, the roll forming unit 1 includes several support rollers 26, several rolls 25, and several roll supports. The roll supports are fixed to the moving platform 18 by bolts. The support rollers 26 and rolls 25 are both mounted on the roll supports. The structure of the support rollers 26 supporting the rolls 25 is adopted. The bimetallic composite sheet is located between the two rolls 25, and the rolls 25 directly contact the bimetallic composite sheet. This reduces the diameter of the rolls 25, and the support rollers 26 can share part of the load, thereby reducing the external load on the rolls 25 and ensuring the rigidity and strength of the rolls 25. The motor drives the rolls 25 to rotate, and the friction of the roll surfaces drives the support rollers 26 to rotate synchronously. The arrangement of the rolls 25 can be customized according to the final irregular cross-sectional shape of the bimetallic composite profile, with different numbers and positions of rollers.

[0047] In this embodiment, the guiding unit includes a limiting plate 2 and several guide rollers 3. The limiting plate 2 is disposed above the several guide rollers 3, and the plane containing the axis of each guide roller 3 is parallel to the plane containing the axis of each guide roller 3. The guide rollers 3 realize the forward movement of the sheet material. The limiting rod is disposed parallel to the guide rollers 3 and is used to limit the sheet material perpendicular to the forward direction, so as to ensure the consistency and stability of the sheet material movement direction. It is fixed on the moving platform 18 by the support rod, which facilitates the control of the conveying direction of the extruded irregular interface bimetallic composite sheet material.

[0048] In this embodiment, the bimetallic composite profile forming equipment 100 also includes a key-locking cylinder 9. The cylinder body of the key-locking cylinder 9 is fixed on the first support 4, and the piston end of the key-locking cylinder 9 is used to fix the mold structure 22, while the moving platform 18 is in a fixed state. The key-locking cylinder 9 adopts a plunger structure, that is, the plunger is used to fix the mold structure 22. Hydraulic oil enters the cylinder body of the key-locking cylinder 9, causing the plunger to move downward, thereby pressing the mold structure 22 to ensure that the mold structure 22 does not shift during the extrusion process, preventing metal from flowing out from the gap between the mold 13 and the extrusion cylinder 11. When the extrusion is finished, the plunger rises, the hydraulic oil is discharged, the key-locking cylinder 9 is released, the mold structure 22 can be disassembled, and the moving platform 18 is in a movable state.

[0049] In this embodiment, the bimetallic composite profile forming equipment 100 further includes an atmosphere protection unit. The atmosphere protection unit includes a housing, an inlet pipe, an outlet pipe, and a regulating valve. The bimetallic composite extrusion forming unit, the electrically assisted online heat treatment unit 21, the guiding unit, and the roll forming unit 1 are all located within the housing. The inlet pipe and the outlet pipe are both connected to the housing, and the regulating valve is located on the inlet pipe. When atmosphere protection is required, provided the housing is well-sealed, all air in the housing is first extracted, and the interior is kept vacuum by pressure control. Then, argon gas is introduced into the housing through the inlet pipe. Once the housing is full, the purpose of atmosphere protection is achieved.

[0050] In this embodiment, the non-straight bonding interface of the bimetallic composite profile is formed by wedge blocks 12. The shape of the irregular bonding interface can be changed by replacing wedge blocks 12 with different specific structural forms. The specific cross-section of the wedge block 12 can be designed as trapezoidal, rectangular, wave-shaped, etc. The periodic shape units of the cross-section of the wedge block 12 have the same or different structural parameters. Therefore, the non-straight bonding interface of the bimetallic composite sheet obtained by using the mold structure 22 of this embodiment is in the form of trapezoidal, rectangular, wave-shaped, etc. The thickness ratio of the two metal sheets in the bimetallic composite sheet can be adjusted according to the total thickness requirement of the bimetallic composite profile and the difference in the plastic processing capability of the bimetallic components. The irregular bonding interface continuously achieves contact and extrusion bonding during the extrusion process, and finally obtains a bimetallic composite sheet with strong metallurgical bonding and irregular bonding interface. The bonding interface of the bimetallic composite profile obtained by this embodiment will partially or completely inherit the irregular interface characteristics, and has the characteristics of large interface bonding area, strong metallurgical bonding and high interface strength, which can expand the application range of composite profiles.

[0051] In this embodiment, the bimetallic composite profile can be a pure metal component such as Cu / Al, Al / Mg, Al / Ti, or Ti / Mg, or a bialloy component such as Cu alloy / Al alloy, Al alloy / Mg alloy, Al alloy / Ti alloy, Ti alloy / Mg alloy, Mg alloy / Mg alloy, or Al alloy / Al alloy, for example, ZK60 / AA6061, AZ91 / AA6063, or TA1 / 2Al2 composite component, but it is not limited to these. This embodiment can form a variety of bimetallic composite profiles and has a wide range of applications.

[0052] The bimetallic composite profile forming equipment 100 of this embodiment can obtain bimetallic composite profiles with irregular interfaces, strong metallurgical bonding, and excellent comprehensive mechanical properties through automated continuous production. This greatly improves the metallurgical bonding of the bimetallic composite interface, enhances the product quality of the composite profile, expands the practicality and application range of the composite profile, shortens the production process, and improves production efficiency.

[0053] Example 2

[0054] like Figure 8 As shown: This embodiment discloses a forming process using a forming device 100 for bimetallic composite profiles according to Embodiment 1, including the following steps:

[0055] Step 1, Production Preparation Stage: According to production requirements, install and debug the mold structure 22, prepare cylindrical bimetallic extrusion blanks, and perform surface impurity removal treatment and preheating (20 ℃~500 ℃) on the blanks, etc.

[0056] Step 2: The billet is extruded through a bimetallic composite extrusion forming unit to obtain a bimetallic composite sheet with a non-straight bonding interface.

[0057] Specifically, the extrusion bonding of bimetallic composite sheets with irregularly shaped interfaces involves: inspecting the equipment, preheating the mold structure 22, quickly loading the billet into the mold, and rationally controlling the extrusion temperature, speed, and extrusion ratio according to the thickness of the bimetallic composite sheet, the plastic forming ability of the bimetallic components, and the interface bonding requirements. Based on the anti-oxidation ability of the deformed bimetal, an air atmosphere or an inert gas protective atmosphere is created.

[0058] In the extrusion process, through the design of a reasonable mold structure 22, near-equal channel synchronous / asynchronous extrusion of bimetals, continuous formation of irregular interfaces, contact matching of irregular interfaces, bimetal extrusion composite with irregular contact interfaces, and flexible adjustment of extrusion ratio can be achieved, ultimately obtaining bimetal composite sheet with irregular bonding interfaces.

[0059] The extrusion speed can be reasonably selected and matched according to the plastic forming performance of the metal composite sheet and the extrusion temperature. For example, Al has good extrusion forming ability at room temperature and extrusion speed of 15-50 m / min, and magnesium alloy has good extrusion forming ability at 300 ℃ and extrusion speed of 20 m / min.

[0060] Step 3: The bimetallic composite plate is heat-treated by the electrically assisted online heat treatment unit 21;

[0061] Specifically, when the bimetallic composite sheet with irregularly shaped interface is extruded and laminated, the electric-assisted online heat treatment unit 21 is used for annealing before rolling. The electric-assisted online annealing uses high current and short time annealing to remove work hardening.

[0062] Step 4: The heat-treated bimetallic composite sheet is conveyed to the roll forming unit, and the bimetallic composite sheet is roll-formed according to the cross-sectional shape of the final bimetallic composite profile.

[0063] The roll type and arrangement of the roll forming rollers are determined according to the final cross-sectional shape of the bimetallic composite profile required by the actual needs and the distribution of single-pass roll forming deformation.

[0064] Specifically, based on the cross-sectional shape characteristics of the bimetallic composite profile and the plastic processing capability of the extruded bimetallic composite sheet, the extruded bimetallic composite sheet is subjected to multi-pass continuous roll forming. According to the component deformation coordination and plastic deformation capability of the bimetallic composite sheet, the roll forming deformation amount of each pass is reasonably allocated until the desired bimetallic composite profile with special cross-section is obtained.

[0065] When selecting the extrusion forming temperature, the temperature of the electric assisted online heat treatment unit 21, and the roll forming temperature parameters, a flexible selection can be made between 20 ℃ and 500 ℃, depending on the composite form of the bimetallic material and the differences in the plastic processing capabilities of the composite components. For example, Cu / Al composite profiles can be processed at room temperature, while Mg / Al composite profiles can be processed at low or medium-high temperatures. The selected temperature parameters should be conducive to interfacial bonding and plastic forming.

[0066] The forming process in this embodiment is mainly applied to the forming and preparation of irregular bimetallic composite profiles. It can realize the continuous forming of irregular cross-section bimetallic composite plates with complex interfaces. The prepared composite profile plates are directly heat-treated and roll-formed into bimetallic composite profile products with irregular cross-sections. This can reduce the disassembly and installation of processed products, eliminate the need for secondary processing, effectively shorten the production line process, and greatly improve production efficiency.

[0067] Application example of Example 2

[0068] The forming process of Cu / Al composite profiles is shown in the attached figure. Figure 8 As shown, the specific steps include:

[0069] Step 1, the production preparation stage includes: according to production needs, installing mold 13 and wedge block 12 that can obtain trapezoidal interface and debugging, preparing two copper cylindrical blanks and aluminum cylindrical blanks with a diameter of 30 mm. Since copper and aluminum have good plastic forming ability at room temperature, subsequent processing is carried out at room temperature of 20 ℃, and the blanks are surface impurity removal treatment.

[0070] Step 2, extrusion bonding of bimetallic composite sheet with irregular bonding interface: Check the equipment, quickly load the copper cylindrical billet and aluminum cylindrical billet into the mold, the total thickness of the extruded composite sheet is 4 mm, the thickness ratio of each layer is determined according to the volume percentage of each metal in the composite sheet, the copper layer is 2 mm thick, the aluminum layer is 2 mm thick, according to the thickness of the bimetallic composite sheet, the plastic forming ability of the bimetallic components and the interface bonding requirements, the extrusion ratio is selected as 12:1, the extrusion speed is 10 mm / s. Since a dense oxide film is easily formed on the aluminum surface in air, an inert gas protective atmosphere needs to be created.

[0071] Step 3, the electric-assisted online heat treatment unit 21 performs heat treatment: Since the extrusion of copper-aluminum composite sheet is a cold working process, the electric-assisted online heat treatment unit 21 performs annealing treatment, which is carried out before rolling. The online annealing of the electric-assisted online heat treatment unit 21 adopts high current and short time annealing to remove work hardening.

[0072] Step 4, Continuous Roll Forming: Based on the corrugated final cross-sectional shape of the bimetallic composite profile and the plastic processing capability of the extruded bimetallic composite sheet, the extruded bimetallic composite sheet is subjected to multiple passes of continuous roll forming. The roll type, arrangement of the 25 rolls, and the cross-sectional shape of the composite sheet after each roll forming are shown in the attached figure. Figure 8 As shown.

[0073] Example 3

[0074] like Figure 9 As shown: This embodiment discloses a forming process using a forming device 100 for bimetallic composite profiles according to Embodiment 1, including the following steps:

[0075] Step 1: Install wedge block 12 according to production requirements;

[0076] Step 2: The billet is extruded through the bimetallic composite extrusion forming unit to obtain a bimetallic composite sheet with a non-straight bonding interface; the billet is put into the first billet inlet and the second billet inlet respectively, the main working cylinder 7 and the return cylinder 17 work, driving the extrusion shaft 10 to extrude the billet to obtain a bimetallic composite sheet with a non-straight bonding interface.

[0077] Step 3: The bimetallic composite sheet is conveyed to the roll forming unit 1, and the bimetallic composite sheet is roll formed according to the cross-sectional shape of the final bimetallic composite profile.

[0078] Step four: The bimetallic composite sheet is heat-treated by the electric-assisted online heat treatment unit 21 to obtain the bimetallic composite profile.

[0079] Specifically, the extrusion bonding of bimetallic composite sheets with irregularly shaped interfaces is a hot process, and the temperature of the deformed material after extrusion bonding can ensure that the bimetallic composite sheet can achieve multi-pass continuous roll deformation. Then, the electric-assisted online heat treatment unit 21 is a strengthening heat treatment (such as aging heat treatment) and is carried out after roll deformation. The electric-assisted online annealing adopts high current and short time annealing to improve strength.

[0080] Application example of Example 3

[0081] The forming process of Mg / Al composite profiles is shown in the attached figure. Figure 9 As shown, the specific steps include:

[0082] Step 1, the production preparation stage includes: according to production needs, installing mold 13 and wedge block 12 that can obtain corrugated interface and debugging; preparing two magnesium cylindrical billets and aluminum cylindrical billets, each with a diameter of 30 mm; since magnesium alloy has poor plastic forming ability at room temperature, in order to obtain better performance, subsequent processing is carried out at 300 ℃; surface impurity removal treatment and preheating are performed on the billets.

[0083] Step 2, extrusion bonding of bimetallic composite sheet with irregular interface: Check the equipment, preheat mold 13, quickly load magnesium cylindrical billet and aluminum cylindrical billet into the mold, the total thickness of the composite sheet after extrusion is 3 mm, the thickness ratio of each layer is determined according to the volume percentage of each metal, the magnesium layer is 2 mm thick and the aluminum layer is 1 mm thick. According to the thickness of the bimetallic composite sheet, the plastic forming ability of the bimetallic components and the interface bonding requirements, the extrusion ratio is selected as 20:1 and the extrusion speed is 15 mm / s.

[0084] Step 3, Continuous Roll Forming: Based on the final cross-sectional shape of the bimetallic composite profile and the plastic processing capability of the extruded bimetallic composite sheet, the extruded bimetallic composite sheet is subjected to multiple passes of continuous roll forming. The roll type, arrangement of the 25 rolls, and the cross-sectional shape of the composite sheet after each roll forming are shown in the attached figure. Figure 9 As shown;

[0085] Step four, the electric-assisted online heat treatment unit 21 performs heat treatment: Since the extrusion of magnesium-aluminum composite sheet is a hot process, and the temperature of the deformed material after extrusion can ensure that the bimetallic composite sheet can achieve multi-pass continuous roll deformation, the electric-assisted online heat treatment unit 21 is a strengthening heat treatment (such as aging heat treatment), and it is carried out after roll deformation. The online annealing of the electric-assisted online heat treatment unit 21 adopts high current and short time annealing to improve strength.

[0086] The composite process of this invention is mainly applied to the forming and preparation of irregularly shaped bimetallic composite profiles. The composite forming process proposed in this invention enables the continuous forming of bimetallic composite sheets with complex interfaces and irregular cross-sections. The prepared composite profile sheets are directly heat-treated online and roll-formed into bimetallic composite profile products with irregular cross-sections. This reduces the disassembly and assembly of processed products, eliminates the need for secondary processing, effectively shortens the production line process, and greatly improves production efficiency. The forming equipment proposed in this invention has a three-beam, six-column structure, specifically including an extrusion forming unit, an online heat treatment unit, a guiding and conveying unit, and a roll-forming unit 1. While achieving the expected effects of the composite forming process, the forming equipment proposed in this invention effectively improves the product quality of the composite profiles, enhances the interfacial bonding strength of the profiles, and further expands the application range of irregularly shaped cross-section composite profiles.

[0087] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A forming device for bimetallic composite profiles, characterized in that: The system includes a bimetallic composite extrusion forming unit, an electrically assisted online heat treatment unit, a guiding unit, and a roll forming unit. The bimetallic composite extrusion forming unit includes a die structure for forming a bimetallic composite sheet with a non-straight bonding interface. One end of the guiding unit is located near the bimetallic composite extrusion forming unit, and the other end is located near the roll forming unit. The guiding unit guides the bimetallic composite sheet. The roll forming unit rolls the bimetallic composite sheet to obtain a bimetallic composite sheet with an irregular cross-section. The electrically assisted online heat treatment unit heats the bimetallic composite sheet. The bimetallic composite extrusion forming unit further includes a first support, a second support, a movable support, a tension column, a main working cylinder, a return cylinder, and two extrusion shafts. The two ends of the tension column are respectively connected to the first support and the second support. The movable support is disposed between the first support and the second support and is slidably connected to the tension column. The first support is provided with a through hole, and one end of the mold structure extends into the through hole. Both extrusion shafts are disposed on the movable support. The cylinder body of the main working cylinder and the cylinder body of the return cylinder are disposed on the second support. The piston end of the main working cylinder and the piston end of the return cylinder are both connected to the movable support. The two extrusion shafts can respectively extend into the mold structure to extrude the blank to form a bimetallic composite sheet with a non-straight bonding interface. The mold structure includes an extrusion cylinder, opposing extrusion channels, a wedge block, a progressive thinning extrusion deformation band, and a forming nozzle. The shape of the wedge block corresponds to the non-straight joint interface. The extrusion cylinder is connected to the first support. The extrusion cylinder is provided with a first loading chamber and a second loading chamber, which are respectively used to place metal billets. The first loading chamber and the second loading chamber are respectively corresponding to an extrusion shaft. The wedge block is located at the center of the front end of the extrusion cylinder. The mold and the forming nozzle are both located at the front end of the extrusion cylinder, and the wedge block, the mold, and the forming nozzle are arranged sequentially from the inside to the outside. The space between the two sides of the wedge block and the mold forms two opposing extrusion channels. One opposing extrusion channel communicates with the first loading chamber, and the other opposing extrusion channel communicates with the second loading chamber. The first outlet on the mold and the second outlet of the forming nozzle form the progressive thinning extrusion deformation band, which communicates with the two opposing extrusion channels. The guiding unit includes a limiting plate and a plurality of guide rollers, the limiting plate being disposed above the plurality of guide rollers.

2. The forming equipment for bimetallic composite profiles according to claim 1, characterized in that: The main working cylinder and the return cylinder share a common oil tank. The return cylinder is a single-rod double-acting piston cylinder. The main working cylinder moves forward by being pushed by the return cylinder.

3. The forming equipment for bimetallic composite profiles according to claim 1, characterized in that: The roll forming unit includes a support roll, a roll forming roll, and a roll support. The support roll and the roll forming roll are both mounted on the roll support. The support roll supports the roll forming roll, and the bimetallic composite sheet is located between two opposing roll forming rolls.

4. The forming equipment for bimetallic composite profiles according to claim 2, characterized in that: The forming equipment for the bimetallic composite profile also includes a key-locking cylinder, the cylinder body of which is fixed on the first bracket, and the piston end of which is used to fix the mold structure.

5. The forming equipment for bimetallic composite profiles according to claim 1, characterized in that: The bimetallic composite profile forming equipment also includes an atmosphere protection unit, which includes a housing, an inlet pipe, an outlet pipe, and a regulating valve. The bimetallic composite extrusion forming unit, the electrically assisted online heat treatment unit, the guiding unit, and the roll forming unit are all located in the housing. The inlet pipe and the outlet pipe are both connected to the housing, and the regulating valve is located on the inlet pipe.

6. A forming process for a forming apparatus using the bimetallic composite profile according to any one of claims 1-5, characterized in that: Includes the following steps: Step 1: Install the wedge blocks according to production requirements; Step 2: The billet is extruded through a bimetallic composite extrusion forming unit to obtain a bimetallic composite sheet with a non-straight bonding interface. Step 3: The bimetallic composite plate is heat-treated using an electrically assisted online heat treatment unit; Step four: The heat-treated bimetallic composite sheet is conveyed to the roll forming unit. According to the cross-sectional shape of the final bimetallic composite profile, the bimetallic composite sheet is roll formed to obtain the bimetallic composite profile.

7. A forming process for a forming apparatus using the bimetallic composite profile according to any one of claims 1-5, characterized in that: Includes the following steps: Step 1: Install the wedge blocks according to production requirements; Step 2: The billet is extruded through a bimetallic composite extrusion forming unit to obtain a bimetallic composite sheet with a non-straight bonding interface. Step 3: The bimetallic composite sheet is conveyed to the roll forming unit, and the bimetallic composite sheet is roll formed according to the cross-sectional shape of the final bimetallic composite profile. Step four: The bimetallic composite sheet is heat-treated by an electric-assisted online heat treatment unit to obtain a bimetallic composite profile.

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