Radial local hot plastic connecting method and device for stainless steel clad bimetallic ring

Abstract

This invention provides a method and apparatus for radial localized hot-pressing plastic connection of stainless steel-clad aluminum bimetallic rings, belonging to the field of bimetallic ring manufacturing technology. The apparatus mainly consists of a ring heating furnace, a radial hydraulic jacking cylinder group, an annular hollow support platform, and shape assembly and fixing modules. First, bonding protrusions and grooves are machined on the outer side of the aluminum alloy ring blank and the inner side of the stainless steel ring blank, respectively. The annular hollow support platform is moved to a specific position in the heating furnace, and the bimetallic ring assembly with bonding protrusions and grooves is fixed on the support platform. The heating furnace is started to heat the bimetallic ring assembly to the required working temperature. The annular hollow support platform lowers the heated bimetallic ring assembly to a certain position at the bottom of the heating furnace. The radial hydraulic jacking cylinder group in the middle of the annular hollow support platform is activated, pressing the aluminum alloy ring blank with protrusions on the inner side into the stainless steel ring blank with grooves on the outer side, thus achieving radial localized hot-pressing plastic connection of the bimetallic rings.

Description

Technical Field

[0001] This invention belongs to the field of bimetallic ring manufacturing technology, specifically a method and apparatus for radial local hot-pressing plastic connection of stainless steel-clad aluminum bimetallic rings. Background Technology

[0002] Stainless steel-aluminum bimetallic rings are composite structures formed by the tight connection of two different metals through plastic deformation or welding. This not only fully utilizes the optimal properties of each metal but also saves significant amounts of precious metals, reduces material costs, and enables lightweight production. They are widely used in aerospace, nuclear power generation, petrochemicals, and ocean shipping industries. Traditional manufacturing methods for bimetallic rings mainly fall into two categories: one involves rolling two single-metal rings separately using a ring rolling mill and then assembling them into a bimetallic ring; the other involves simultaneously rolling aluminum alloy and stainless steel ring blanks together at a specific temperature. Both methods involve numerous production steps, difficulty in achieving uniform temperature control, and require large-tonnage equipment with high demands on rolling equipment. Furthermore, the low connection strength of bimetallic rings makes them unsuitable for high-performance applications requiring high strength and sealing.

[0003] The rolling equipment for stainless steel-aluminum alloy bimetallic rings has a large tonnage and a complex overall rolling process. The rolling process has high requirements for parameters such as temperature, rolling speed, and feed rate. At the same time, the rolled bimetallic rings have low interfacial bonding strength, many defects, and unstable performance, which poses challenges to the high-performance manufacturing and long-term service of bimetallic rings. Summary of the Invention

[0004] This invention proposes a method and apparatus for radial local hot-pressing plastic connection of stainless steel-clad aluminum bimetallic rings, aiming to solve the following problems: how to reduce equipment tonnage, how to achieve high-strength connection of large rings, uniform component temperature and controllable stability, and how to connect rings of different shapes.

[0005] To address the aforementioned challenges, this invention proposes a method for preparing a composite ring by plastically bonding an aluminum alloy ring blank and a stainless steel ring blank under a constant temperature environment. The apparatus comprises: a ring heating furnace, a radial hydraulic top cylinder group, a servo hydraulic system, an annular hollow support platform, and a shape assembly and fixing module, etc.

[0006] The specific implementation of manufacturing a stainless steel-clad aluminum bimetallic ring includes the following steps.

[0007] S1: Single ring blank preparation, making the inner diameter of the stainless steel ring blank larger than the outer diameter of the aluminum alloy ring blank.

[0008] S2: A groove structure is machined on the inner side of the stainless steel ring blank.

[0009] S3: A raised structure is machined on the outside of the aluminum alloy ring blank to bond with the groove of the stainless steel ring blank, so that it fills the groove exactly.

[0010] S4: Place the processed aluminum alloy ring blank and stainless steel ring blank on the annular hollow support platform and fix them.

[0011] S5: Using the lifting device of the annular hollow support platform, move the fixed bimetallic ring assembly to the appropriate position in the ring heating furnace.

[0012] S6: The aluminum alloy ring blank and the stainless steel ring blank are assembled in a ring heating furnace and heated to a certain temperature as a whole.

[0013] S7: The heated bimetallic ring assembly is lowered to a specific position at the bottom of the heating furnace via an annular hollow support platform to avoid the furnace temperature from being too high and affecting the bottom hydraulic top cylinder group.

[0014] S8: The bottom hydraulic cylinder drives the radial hydraulic top cylinder group, so that the combined top block of the hydraulic rod head is flush with the aluminum alloy ring billet and stainless steel ring billet assembly.

[0015] S9: Using a radial hydraulic top cylinder group, the aluminum alloy ring blank with protrusions on the inner side is pressed into the stainless steel ring blank with grooves on the outer side; during the local hot pressing connection process, if the temperature of the ring assembly drops below the forming temperature range, the temperature of the assembly is kept within the forming temperature range by repeating steps

[0011] ,

[0012] , and

[0013] .

[0016] S10: After local hot-pressing plastic connection, the bimetallic ring hot-pressed plastic connector is lifted out of the ring heating furnace through a lifting annular hollow support platform.

[0017] S11: Shut down the ring furnace and servo hydraulic system, return the equipment to its original position, and complete the test.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0019] This invention discloses a method and apparatus for radial localized hot-pressing plastic connection of stainless steel-clad aluminum bimetallic rings. By designing an annular hollow support platform at the bottom of the ring heating furnace, the bimetallic rings can be fixed, and the heating temperature range of the bimetallic rings can be adjusted via a telescopic rod. A bottom hydraulic cylinder drives a group of radial hydraulic cylinders to move up and down in clusters. The radial hydraulic cylinder structure allows the aluminum alloy ring blank with protrusions on the inner side to be pressed entirely into the stainless steel ring blank with grooves on the outer side, achieving a hot-pressing plastic fitting connection of the bimetallic rings. The addition of a ring heating furnace to the isothermal local extrusion device ensures uniform and controllable temperature adjustment. By connecting different shaped combination modules to the upper end of the hydraulic rods, localized hot-pressing plastic connection of bimetallic rings of different shapes (circular, elliptical, and square) and sizes can be achieved. Attached Figure Description

[0020] To more clearly illustrate the implementation scheme of the radial local hot-pressing plastic connection method for stainless steel-clad aluminum bimetallic rings according to the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of a radial localized thermo-plastic connection of a bimetallic ring. Figure 2 This is a schematic diagram of the aluminum alloy ring blank processed in Example 1; Figure 3 This is a schematic diagram of the stainless steel ring blank processed in Example 1; Figure 4 This is a schematic diagram of the heating process of the aluminum alloy-stainless steel circular connecting ring assembly in Example 1; Figure 5 This is a schematic diagram of the local hot-pressing plastic connection process of the aluminum alloy-stainless steel circular connecting ring in Example 1; Figure 6 This is a schematic diagram of the radial hydraulic jacking cylinder group distribution in Example 1; Figure 7 This is a schematic diagram of the aluminum alloy square ring blank processed in Example 2; Figure 8 This is a schematic diagram of the stainless steel square ring blank processed in Example 2; Figure 9 This is a schematic diagram of the radial hydraulic jacking cylinder group distribution in Example 2; Figure 10 This is a diagram of the elliptical aluminum alloy ring blank processed in Example 3; Figure 11 This is a diagram of the stainless steel elliptical ring blank processed in Example 3; Figure 12 This is a diagram showing the distribution of the radial hydraulic jacking cylinder group in Example 3.

[0022] Figure 1Main reference numerals: 1-Lower insulation box; 2-Upper insulation box; 3-Insulation box cover; 4-Viewing window; 5-Lifting ring; 6-Heating furnace; 7-Stainless steel ring blank; 8-Pressure positioning block; 9-Plate; 10-Combined top block; 11-Multi-faceted fixing platform; 12-Hydraulic rod; 13-Hydraulic cylinder; 14-Hydraulic guide rod; 15-Annular hollow support platform; 16-Aluminum alloy ring blank; 17-Fastening bolt; 18-Hydraulic rod; 19-Hydraulic cylinder. Detailed Implementation

[0023] The above and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0024] Please see Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 .

[0025] This invention proposes a method and apparatus for radial localized hot-pressing plastic joining of stainless steel-clad aluminum bimetallic rings. The aluminum alloy ring blank and the stainless steel ring blank are machined to achieve mechanical bonding. A hollow annular support platform is used to transport the bimetallic ring assembly to a specific location inside a ring-forming furnace and heat it to a specific temperature. A hydraulic guide rod at the center of the furnace bottom reciprocates up and down, using combined top blocks on radially distributed hydraulic cylinders to press the outer protruding structure of the aluminum alloy ring blank into the inner grooved stainless steel ring blank structure, achieving radial localized hot-pressing plastic joining of the bimetallic rings. This method uses small-tonnage equipment, offers stable localized isothermal extrusion joining, provides precise and controllable parameters, and results in high bonding strength and fewer defects in the joined parts. It overcomes the problems of unstable performance, difficult parameter control, and numerous defects caused by traditional bimetallic ring welding and double-ring rolling processes.

[0026] The basic components of this local hot-pressing plastic connection system mainly include: a lower insulation box 1; an upper insulation box 2; an insulation box cover 3; a viewing window 4; a lifting ring 5; a heating furnace 6; a stainless steel ring blank 7; a clamping and positioning block 8; a pad 9; a combined top block 10; a multi-faceted fixing platform 11; a hydraulic rod 12; a hydraulic cylinder 13; a hydraulic guide rod 14; a circular hollow support platform 15; an aluminum alloy ring blank 16; fastening bolts 17; a hydraulic rod 18; and a hydraulic top cylinder 19, etc. The main steps are as follows.

[0027] Prepare stainless steel ring blank 7 and aluminum alloy ring blank 16, such that the inner diameter of stainless steel ring blank 7 is 20~40mm larger than the outer diameter of aluminum alloy ring blank 16.

[0028] A groove structure is machined on the inner side of the stainless steel ring blank 7.

[0029] A raised structure is machined on the outside of the aluminum alloy ring blank 16 to bond with the groove of the stainless steel ring blank 7, so that it can be precisely filled into the groove.

[0030] The assembled aluminum alloy ring blank 16 and stainless steel ring blank 7 are hoisted onto the annular hollow support platform 15, centered, and positioned using the clamping positioning block 8.

[0031] Adjust the lifting cylinder system of the annular hollow support platform 15 to move the fixed bimetallic rings 16 and 7 to the appropriate position in the ring heating furnace 6.

[0032] The aluminum alloy ring blank 16 and the stainless steel ring blank 7 assembly are heated to a specific temperature in the ring heating furnace 6.

[0033] The annular hollow support platform 15 drives the combination of bimetallic rings 16 and 7 to descend into the lower insulation box 1 at the bottom of the heating furnace.

[0034] The cylinder located at the center of the lower insulation box 1 starts to work, driving the hydraulic guide rod 14, so that the radial hydraulic top cylinder group 13 and the hydraulic rod 12 are aligned with the bimetallic ring 16 and 7 assembly.

[0035] The radial hydraulic jacking cylinder group connected by the hydraulic guide rod 14 presses the aluminum alloy ring blank 16 with the outer protrusion into the stainless steel ring blank 7 with the inner groove, thereby achieving a plastic connection between the aluminum alloy ring blank and the stainless steel ring blank.

[0036] Throughout the entire local hot-pressing plastic connection process, when the temperature of the bimetallic rings 16 and 7 assembly drops, the annular hollow support platform 15 drives the assembly to reciprocate in the ring heating furnace 6 to maintain it within a given temperature range, and then reciprocates

[0033] ,

[0034] ,

[0035] to complete the manufacturing of the bimetallic ring.

[0037] After the partial hot-pressing plastic connection of the assembly is completed, the bimetallic ring hot-pressed plastic connector is lifted out of the ring heating furnace 6 by the lifting annular hollow support platform 15.

[0038] Shut down the ring heating furnace 6 and the servo hydraulic system, return the equipment to its original position, and complete the test.

[0039] Example 1 of bimetallic ring.

[0040] For the process of localized hot-pressing plastic joining of aluminum alloy and stainless steel bimetallic rings, please refer to [link / reference]. Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 .

[0041] The local hot-pressing plastic connection of aluminum alloy-stainless steel bimetallic rings can be divided into three main stages: (1) the assembly stage of aluminum alloy-stainless steel circular connecting ring blanks; (2) the heating stage of aluminum alloy-stainless steel circular connecting ring assembly; and (3) the local hot-pressing plastic connection stage of aluminum alloy-stainless steel circular connecting rings.

[0042] Taking 1Cr12Ni2WMoVNb stainless steel plate and 2A80 aluminum alloy as examples, first process the raised structure on the outer side of the aluminum alloy ring blank 16, then process the groove on the inner side of the stainless steel ring blank 7, ensuring that the raised structure can be precisely filled into the groove, such as... Figure 2 and Figure 3 As shown; the processed aluminum alloy-stainless steel ring blank assembly is hoisted onto the annular hollow support platform 15 and positioned using the clamping positioning block 8; the lifting cylinder system of the annular hollow support platform 15 is adjusted to move the fixed bimetallic rings 16 and 7 to the appropriate position in the ring heating furnace 6; the annular heating furnace 6 heats the aluminum alloy ring blank 16 and stainless steel ring blank 7 assembly to 430℃~450℃; then the annular hollow support platform 15 drives the bimetallic rings 16 and 7 assembly to descend into the lower insulation box 1 at the bottom of the heating furnace 6; the radial hydraulic top cylinder group connected by the hydraulic guide rod 14 presses the aluminum alloy ring blank 16 with the inner protruding structure into the stainless steel ring blank 7 with the outer groove structure, realizing the local plastic connection between the aluminum alloy ring and the stainless steel ring.

[0043] Example 2 of bimetallic square ring.

[0044] The process of localized hot-pressing plastic connection of aluminum alloy-stainless steel bimetallic square rings is described in [link to documentation]. Figure 7 , Figure 8 and Figure 9 .

[0045] Taking 1Cr12Ni2WMoVNb stainless steel plate and 2A80 aluminum alloy as examples, first process the raised structure on the outer side of the aluminum alloy square ring blank 16, then process the groove on the inner side of the stainless steel square ring blank 7, ensuring that the raised structure can be precisely filled into the groove, such as... Figure 7 and Figure 8 As shown; the processed aluminum alloy-stainless steel square ring blank assembly is hoisted onto the annular hollow support platform 15 and positioned using the clamping positioning block 8; the lifting cylinder system of the annular hollow support platform 15 is adjusted to move the fixed bimetallic square rings 16 and 7 to the appropriate position in the heating furnace 6; the aluminum alloy square ring blank 16 and stainless steel square ring blank 7 assembly is heated to 430℃~450℃ using the heating furnace 6; then the hollow support platform 15 drives the bimetallic rings 16 and 7 assembly to descend into the lower insulation box 1 at the bottom of the heating furnace 6; the radial hydraulic top cylinder group connected by the hydraulic guide rod 14 presses the aluminum alloy square ring blank 16 with the inner protrusion into the stainless steel square ring blank 7 with the outer groove, realizing the local plastic connection between the aluminum alloy square ring and the stainless steel square ring.

[0046] Example 3: Bimetallic elliptical ring.

[0047] For the process of localized hot-pressing plastic connection of aluminum alloy-stainless steel bimetallic elliptical rings, please refer to [link / reference]. Figure 10 , Figure 11 and Figure 12 .

[0048] Taking 1Cr12Ni2WMoVNb stainless steel plate and 2A80 aluminum alloy as examples, first process the raised structure on the outer side of the aluminum alloy elliptical ring blank 16, then process the groove on the inner side of the stainless steel elliptical ring blank 7, ensuring that the raised structure can be precisely filled into the groove, such as... Figure 10 and Figure 11 As shown; the processed aluminum alloy-stainless steel elliptical ring blank assembly is hoisted onto the annular hollow support platform 15 and positioned using the clamping positioning block 8; the lifting cylinder system of the annular hollow support platform 15 is adjusted to move the fixed bimetallic elliptical rings 16 and 7 to the appropriate position in the heating furnace 6; the aluminum alloy elliptical ring blank 16 and stainless steel elliptical ring blank 7 assembly is heated to 430℃~450℃ using the heating furnace 6; then the annular hollow support platform 15 drives the bimetallic elliptical ring 16 and 7 assembly to descend into the lower insulation box 1 at the bottom of the heating furnace 6; the radial hydraulic top cylinder group connected by the hydraulic guide rod 14 presses the aluminum alloy elliptical ring blank 16 with the outer protrusion into the stainless steel elliptical ring blank 7 with the inner groove, realizing the local plastic connection between the aluminum alloy elliptical ring and the stainless steel elliptical ring.

[0049] In summary, this invention proposes a method and apparatus for radial localized hot-pressing plastic connection of stainless steel-clad aluminum bimetallic rings. An annular hollow support platform is designed at the bottom of the ring heating furnace, and a telescopic rod adjusts the heating temperature range of the bimetallic ring within the furnace. A telescopic load-bearing frame is designed to drive the radial hydraulic cylinder cluster to move up and down. The radial hydraulic cylinder cluster structure allows the outer, protruding aluminum alloy ring blank to be pressed entirely into the inner, grooved stainless steel ring blank, achieving localized hot-pressing plastic connection of the bimetallic ring. Furthermore, by connecting different shaped combination modules to the upper end of the hydraulic rods, localized hot-pressing plastic connection of bimetallic rings of different shapes (circular, elliptical, and square) and sizes can be achieved. This method requires equipment with small tonnage, allows for precise and controllable parameters, and produces high interfacial fitting strength. It also overcomes the problems of unstable performance, difficult parameter control, and numerous defects caused by traditional bimetallic ring welding and double-ring rolling processes.

[0050] The above description is merely a preferred embodiment of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the above embodiments or equivalent substitutions can be made to some or all of the technical features therein. Such modifications and substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radial localized hot-pressing plastic connection device for stainless steel-clad aluminum bimetallic rings, characterized in that: include: The components include a lower insulation box, an upper insulation box, an insulation box cover, a heating furnace, a radial hydraulic jacking cylinder group, a lifting hydraulic system, an annular hollow support platform, a bimetallic ring assembly, and a pressing and positioning block. The upper insulation box is located on top of the lower insulation box, and the top of the upper insulation box is equipped with an insulation box cover. The heating furnace is located inside the upper insulation box. The bottom of the lower insulation box is equipped with a pad, and a hydraulic guide rod is set at the center of the pad. The hydraulic guide rod is connected to a multi-faceted fixing platform. A radially distributed group of radial hydraulic top cylinders is assembled around the multi-faceted fixing platform. The radial hydraulic top cylinder group includes a hydraulic cylinder, a hydraulic rod, and a combined top block. The annular hollow support platform is supported and arranged inside the compression molding connection device by a telescopic rod. The annular hollow support platform is equipped with a clamping positioning block and fastening bolts for positioning the bimetallic ring assembly composed of an aluminum alloy ring blank and a stainless steel ring blank. The outer side of the aluminum alloy ring blank has a protruding structure, and the inner side of the stainless steel ring blank has a groove structure that matches and bonds with the protruding structure. The annular hollow support platform can drive the bimetallic ring assembly to rise and fall, so that the bimetallic ring assembly enters the heating furnace for heating, and then descends into the lower insulation box to be flush with the radial hydraulic top cylinder group. The radial hydraulic top cylinder group is used to press the aluminum alloy ring blank with the protrusion on the outside into the stainless steel ring blank with the groove on the inside, realizing the radial local hot-pressing plastic connection of the bimetallic ring.

2. The radial local hot-pressing plastic connection device for a stainless steel-clad aluminum bimetallic ring according to claim 1, characterized in that, The aluminum alloy and stainless steel bimetallic ring assembly is heated to 430℃-450℃, and the assembly is reciprocated in the ring heating furnace using a hollow annular support platform to maintain it within the given temperature range.

3. A method for radial localized hot-pressing plastic connection of stainless steel-clad aluminum bimetallic rings, applied to the radial localized hot-pressing plastic connection device for stainless steel-clad aluminum bimetallic rings as described in any one of claims 1-2, characterized in that, Includes the following steps: Step S1: Machining a raised structure on the outside of the aluminum alloy ring blank; Step S2: Machining a bonding groove structure on the inner side of the stainless steel ring blank that it mates with; Step S3: Place the finished aluminum alloy ring blank and stainless steel ring blank sets on the annular hollow support platform for assembly and fixation; Step S4: Using the lifting mechanism of the annular hollow support platform, move the fixed bimetallic ring assembly to the appropriate position in the heating furnace. Step S5: Heat the aluminum alloy ring billet and stainless steel ring billet assembly to 430℃-450℃ in a heating furnace; Step S6: Lower the bimetallic ring assembly into the lower insulation box and align it with the radial hydraulic top cylinder group using the annular hollow support platform; Step S7: The aluminum alloy ring blank with protrusions on the outer side is pressed into the stainless steel ring blank with grooves on the inner side by a radial hydraulic jacking cylinder group to achieve local hot-pressing plastic connection of the bimetallic ring parts. Step S8: After local hot pressing and plastic connection, the bimetallic ring hot pressing plastic connector is lifted out of the heating furnace using a lifting annular hollow support platform; Step S9: Turn off the ring furnace.

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