Titanium alloy corrugated sheet forming apparatus and method
Patent Information
- Application Number
- CN202410320866.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2044-03-20
AI Technical Summary
[0005]本申请提供了一种钛合金波纹板成形装置及方法，要解决的技术问题是：钛合金波纹板成形制备时型面成形困难、型面精度差、小R角过渡区易开裂
[0019]本申请的上述技术方案具有如下优点：
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Abstract
Description
Technical Field
[0001] This application relates to the field of corrugated plate technology, and in particular to a titanium alloy corrugated plate forming apparatus and method. Background Technology
[0002] The crisscrossing lattice structure composed of trapezoidal corrugated plates has advantages such as low structural density and high specific strength, and is widely used in the aerospace manufacturing field. Corrugated plates are formed using methods such as multi-pass cold rolling and liquid forming. However, for titanium alloys such as TC4, due to their high strength and poor plasticity, multi-pass cold rolling results in large deformation in the radius (R-zone), easily leading to bending cracks, and also results in low production efficiency due to the large number of rolling passes. When using the liquid forming method, the high strength of titanium alloys requires high-tonnage forming equipment, and forming the small radius transition zone is difficult.
[0003] Therefore, the inventors have provided a titanium alloy corrugated plate forming apparatus and method. Summary of the Invention
[0004] (1) Technical problems to be solved
[0005] This application provides a titanium alloy corrugated plate forming apparatus and method. The technical problem to be solved is that the titanium alloy corrugated plate forming process is difficult, the surface accuracy is poor, and the small R-angle transition zone is prone to cracking.
[0006] (2) Technical solution
[0007] In a first aspect, this application provides a titanium alloy corrugated plate forming apparatus, including a bottom mold and a plurality of upper mold pressing strips; the bottom mold is provided with a plurality of grooves, and each of the upper mold pressing strips is provided with a protrusion adapted to the groove; the bottom mold is used to place a titanium alloy plate, and each of the upper mold pressing strips is used to press the titanium alloy plate into the groove through the protrusion, so that the titanium alloy plate is formed into a titanium alloy corrugated plate; the position on the bottom mold corresponding to the crest of the titanium alloy corrugated plate is a theoretical surface, and the position corresponding to the trough of the titanium alloy corrugated plate is provided with a first clearance groove; the position on the upper mold pressing strip corresponding to the trough of the titanium alloy corrugated plate is a theoretical surface, and the position corresponding to the crest of the titanium alloy corrugated plate is provided with a second clearance groove.
[0008] Furthermore, each of the upper mold strips is sequentially assembled onto the bottom mold to achieve the forming of the titanium alloy corrugated plate.
[0009] Furthermore, the size of the first clearance groove is larger than the size of the second clearance groove.
[0010] Furthermore, the first clearance groove includes a first rounded corner adjacent to the trough, a straight area, and a second rounded corner away from the trough.
[0011] Furthermore, the second clearance groove is a rounded corner clearance groove.
[0012] Furthermore, the titanium alloy corrugated plate forming device also includes a pressing strip, which is used to press one end of the titanium alloy plate tightly onto the bottom mold.
[0013] Secondly, this application provides a method for forming a titanium alloy corrugated plate, which is implemented based on the titanium alloy corrugated plate forming apparatus described above, and includes the following steps:
[0014] A titanium alloy plate is placed on the bottom mold, and one end of the titanium alloy plate is pressed tightly onto the bottom mold by a pressing strip;
[0015] Each upper die strip is sequentially assembled onto the bottom die. The titanium alloy plate is pressed into the groove of the bottom die through the protrusions of the upper die strips, so that the titanium alloy plate is formed into a titanium alloy corrugated plate.
[0016] Furthermore, the titanium alloy corrugated plate forming method further includes:
[0017] The assembled titanium alloy corrugated plate forming device is placed in a vacuum heating furnace for thermal shaping.
[0018] (3) Beneficial effects
[0019] The above-mentioned technical solution of this application has the following advantages:
[0020] The titanium alloy corrugated plate forming apparatus and method provided in this application address the difficulties in forming corrugated plates of titanium alloy materials such as TC4. It proposes a special forming tooling and a corresponding hot forming process, and designs a combined forming tooling with a theoretical profile on the convex surface of the transition zone and a clearance area on the concave surface of the transition zone. During forming, the convex surface of the transition zone ensures the accuracy of the theoretical profile, while the clearance area on the concave surface alleviates the local deformation accumulation caused by the meshing of the upper and lower molds in the transition zone during the forming process. It solves the problems of difficult profile forming, poor profile accuracy, and easy cracking in the small R-angle transition zone during the forming and preparation of titanium alloy corrugated plates, and realizes the one-time forming and preparation of titanium alloy corrugated plates. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of a trapezoidal corrugated plate;
[0023] Figure 2A schematic diagram of a lattice structure composed of trapezoidal corrugated plates;
[0024] Figure 3 The pattern for 12-pass continuous forming of Q345 low alloy steel;
[0025] Figure 4 A schematic diagram of the double-sided bulging and liquid-filling forming method for 2024 aluminum alloy;
[0026] Figure 5 A schematic diagram of the titanium alloy corrugated plate forming device provided in this application;
[0027] Figure 6 A schematic diagram of the first air-cushioning groove provided for this application;
[0028] Figure 7 This is a schematic diagram of the titanium alloy corrugated plate forming process provided in this application.
[0029] Reference numerals in the attached drawings: 1. Bottom mold; 2. Upper mold pressure strip; 3. Groove; 4. Protrusion; 5. Titanium alloy plate; 6. First clearance groove; 61. First rounded corner; 62. Straight area; 63. Second rounded corner; 7. Second clearance groove; 8. Pressure strip. Detailed Implementation
[0030] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.
[0031] It should be understood that, when used in this application specification and appended claims, the term "comprising" indicates the presence of the described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. The terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, in the description of this application specification and appended claims, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.
[0033] use Figure 1 The crisscrossing trapezoidal corrugated plates shown are Figure 2 The lattice structure shown has advantages such as low structural density and high specific strength. Figure 1 The corrugated plate shown has the characteristics of small radius (R≤1.0) and many crests / troughs. For this type of corrugated plate, direct cold pressing or hot pressing with upper and lower molds has the following problems: ① Due to the meshing of the upper and lower molds during forming, it is difficult to feed the material when forming the middle part of the corrugation, and the crests and troughs are not easy to form in place, or the wall thickness is severely reduced; ② The radius (R) of the transition area between the crests and troughs is small, the deformation is large, and crack defects are easy to occur.
[0034] For Q345 low alloy steel trapezoidal corrugated plates, the following has been proposed Figure 3 The 12-pass continuous forming method shown employs a step-by-step cold pressing forming approach, first forming the corrugated middle section, then forming the side corrugations. For 2024 aluminum alloy trapezoidal corrugated plates with different radius angles, a proposed method is... Figure 4 The method shown is a double-sided bulging liquid-filling forming method, in which one side is pre-formed by liquid filling, and then the other side is flipped over for final liquid filling. The minimum radius (R) of the formed shape is 3.5 degrees. For titanium alloy materials such as TC4, due to their high strength and poor plasticity, this method is employed... Figure 3 As shown, during multi-pass cold rolling, the deformation in the radius (R) is large, which easily leads to bending cracks. Furthermore, the large number of rolling passes results in low production efficiency. When using the liquid-filled forming method, the high strength of titanium alloys necessitates high-tonnage forming equipment, and forming the small radius transition zone is difficult.
[0035] To address the aforementioned problems, the purpose of this application is to provide a titanium alloy corrugated plate forming apparatus and method, which solves the problems of difficult surface forming, poor surface accuracy, and easy cracking in the small R-angle transition zone during the forming and preparation of titanium alloy corrugated plates, and realizes one-time forming and preparation of titanium alloy corrugated plates.
[0036] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.
[0037] like Figure 5As shown, the titanium alloy corrugated plate forming device provided in this embodiment includes a bottom mold 1 and multiple upper mold pressing strips 2; the bottom mold 1 is provided with multiple grooves 3, and each of the upper mold pressing strips 2 is provided with a protrusion 4 adapted to the groove 3; the bottom mold 1 is used to place a titanium alloy plate 5, and each of the upper mold pressing strips 2 is used to press the titanium alloy plate 5 into the groove 3 through the protrusion 4, so that the titanium alloy plate 5 is formed into a titanium alloy corrugated plate; the position on the bottom mold 1 corresponding to the crest of the titanium alloy corrugated plate is a theoretical surface, and the position corresponding to the trough of the titanium alloy corrugated plate is provided with a first clearance groove 6; the position on the upper mold pressing strip 2 corresponding to the trough of the titanium alloy corrugated plate is a theoretical surface, and the position corresponding to the crest of the titanium alloy corrugated plate is provided with a second clearance groove 7.
[0038] In some embodiments, each of the upper mold strips 2 is sequentially assembled on the bottom mold 1 to achieve the forming of the titanium alloy corrugated plate.
[0039] In some embodiments, the size of the first clearance groove 6 is larger than the size of the second clearance groove 7.
[0040] like Figure 6 As shown, in some embodiments, the first clearance groove 6 includes a first rounded corner 61 adjacent to the trough, a straight area 62, and a second rounded corner 63 away from the trough.
[0041] In some embodiments, the second clearance groove 7 is a rounded corner clearance groove.
[0042] In some embodiments, the titanium alloy corrugated plate forming apparatus further includes a pressing strip 8, which is used to press one end of the titanium alloy plate 5 tightly onto the bottom mold 1.
[0043] In applications, the titanium alloy corrugated sheet forming device includes a bottom mold, an upper mold pressure strip, and a pressure strip. The bottom mold has a first clearance groove corresponding to the troughs of the titanium alloy corrugated sheet, and the position corresponding to the crest of the corrugated sheet is the theoretical profile. The upper mold pressure strip has a second clearance groove corresponding to the crest of the corrugated sheet, and the position corresponding to the trough of the corrugated sheet is the theoretical profile. The theoretical profiles on the bottom mold and the upper mold pressure strip serve as the planes for applying the driving force during the forming of the titanium alloy corrugated sheet, ensuring the profile accuracy of the sheet. The clearance grooves on the bottom mold and the upper mold pressure strip prevent the corrugated sheet from engaging with the mold at the initial contact point during forming, which could lead to excessive local deformation, local breakage, or severe thinning.
[0044] Considering the different deformation processes caused by the contact sequence, the size of the first clearance groove on the bottom mold is larger than the size of the second clearance groove on the upper mold pressure strip; the second clearance groove on the upper mold pressure strip is a large rounded corner clearance groove, while the second clearance groove on the bottom mold is as follows... Figure 6As shown, it consists of a first rounded corner adjacent to the trough, a straight area, and a second rounded corner away from the trough.
[0045] The titanium alloy corrugated sheet forming device also includes a pressure strip. Before forming, one end of the titanium alloy sheet to be formed, of a certain width, is first placed between the pressure strip and the bottom mold. Figure 7 As shown; then the upper mold strips are sequentially assembled onto the bottom mold to form the structure of each corrugated plate peak; finally, the assembled structure is placed in a vacuum heating furnace for heat treatment.
[0046] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application.
[0047] This embodiment also provides a method for forming titanium alloy corrugated plates, based on the titanium alloy corrugated plate forming apparatus described above, including the following steps:
[0048] A titanium alloy plate is placed on the bottom mold, and one end of the titanium alloy plate is pressed tightly onto the bottom mold by a pressing strip;
[0049] Each upper die strip is sequentially assembled onto the bottom die. The titanium alloy plate is pressed into the groove of the bottom die through the protrusions of the upper die strips, so that the titanium alloy plate is formed into a titanium alloy corrugated plate.
[0050] In some embodiments, the titanium alloy corrugated plate forming method further includes: placing the assembled titanium alloy corrugated plate forming device into a vacuum heating furnace for thermal shaping treatment.
[0051] In this application, we will take a 0.6mm thick TC4 titanium alloy flat plate with corrugated plate geometry as an example: trapezoidal platform dimension a = 4mm, transition fillet R = 1.0mm, total corrugation height H = 23mm, and corrugation width 4mm. The forming device used is as follows: Figure 5 As shown, the dimensions of the first clearance groove are: the first fillet radius R = 3 at the connection with the trough, the length of the flat area is 15mm, and the second fillet radius R = 5 at the distance from the trough; the dimensions of the second clearance groove are R = 5.
[0052] The forming process is as follows: First, one end of the titanium alloy sheet to be formed is placed between the pressure strip and the bottom mold; then, the upper mold pressure strip is assembled onto the bottom mold in sequence to form the structure of each wave crest of the corrugated plate; finally, the assembled overall structure is placed in a vacuum heating furnace for heat treatment and shaping, with a heating temperature of 700℃ and a holding time of 3 hours.
[0053] The titanium alloy corrugated plate forming apparatus and method provided in this application address the problems of difficult surface forming, poor surface accuracy, and easy cracking in the small R-angle transition zone during the forming and preparation of titanium alloy corrugated plates. A combined forming fixture is designed with the theoretical surface adopted for the convex surface of the transition zone, while the concave surface of the transition zone has a clearance area. Considering the different stress modes of the trough and crest regions during the forming process, clearance areas with different geometric sizes are designed at the trough and crest. During forming, the convex surface of the transition zone ensures the theoretical surface accuracy, while the clearance area of the concave surface alleviates the deformation accumulation caused by the meshing of the upper and lower molds in the deformation transition zone. The corresponding forming method is determined to realize the one-time forming and preparation of titanium alloy trapezoidal corrugated plates.
[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0055] Those skilled in the art will recognize that the device and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0056] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A titanium alloy corrugated plate forming device, characterized in that, The device includes a bottom mold and multiple upper mold pressing strips. The bottom mold has multiple grooves, and each of the upper mold pressing strips has a protrusion that matches the groove. The bottom mold is used to place a titanium alloy plate, and each of the upper mold pressing strips is used to press the titanium alloy plate into the groove through the protrusion, so that the titanium alloy plate is formed into a titanium alloy corrugated plate. The position on the bottom mold corresponding to the crest of the titanium alloy corrugated plate is a theoretical surface, and the position corresponding to the trough of the titanium alloy corrugated plate is provided with a first clearance groove. The position on the upper mold pressing strip corresponding to the trough of the titanium alloy corrugated plate is a theoretical surface, and the position corresponding to the crest of the titanium alloy corrugated plate is provided with a second clearance groove. The size of the first clearance groove is larger than the size of the second clearance groove. The first clearance groove includes a first rounded corner adjacent to the trough, a straight area, and a second rounded corner away from the trough. The second clearance groove is a rounded corner clearance groove.
2. The titanium alloy corrugated plate forming device as described in claim 1, characterized in that, Each of the upper mold strips is sequentially assembled onto the bottom mold to achieve the forming of the titanium alloy corrugated plate.
3. The titanium alloy corrugated plate forming device as described in claim 1, characterized in that, The titanium alloy corrugated plate forming device also includes a pressing strip, which is used to press one end of the titanium alloy plate tightly onto the bottom mold.
4. A method for forming a titanium alloy corrugated plate, characterized in that, The process, based on the titanium alloy corrugated plate forming apparatus as described in any one of claims 1 to 3, includes the following steps: A titanium alloy plate is placed on the bottom mold, and one end of the titanium alloy plate is pressed tightly onto the bottom mold by a pressing strip; Each upper die strip is sequentially assembled onto the bottom die. The titanium alloy plate is pressed into the groove of the bottom die through the protrusions of the upper die strips, so that the titanium alloy plate is formed into a titanium alloy corrugated plate.
5. The titanium alloy corrugated plate forming method as described in claim 4, characterized in that, The titanium alloy corrugated plate forming method further includes: The assembled titanium alloy corrugated plate forming device is placed in a vacuum heating furnace for thermal shaping.
Citation Information
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