TA15 titanium alloy wallboard forging method and TA15 titanium alloy wallboard
By improving the intermediate blank design of TA15 titanium alloy wall forgings, the double-sided bosses were changed to a single-sided bosses, and numerical simulation assistance was used to solve the problem of folding defects in the traditional forging process, achieving higher refined quality.
Patent Information
- Application Number
- CN202510216027.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-06-27
AI Technical Summary
TA15 titanium alloy wall forgings are prone to serious folding defects during the forging of traditional intermediate blanks, which cannot meet the requirements of fine-tuning of die forgings.
Improve the design of the intermediate blank, change the double-sided boss to a single-sided boss, and use numerical simulation to assist in the refinement of forgings, and optimize the forging process to avoid folding defects.
Through improved intermediate blank design and numerical simulation assistance, excessive blank distribution on the ribs on the side of the forging height is successfully avoided, which reduces the accumulation of excess metal, avoids the occurrence of folding defects, and improves the fine quality of the forging.
Smart Images
Figure CN120205730A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of forging, specifically to the field of forging aircraft parts, and particularly to a forging method for TA15 titanium alloy wall panels and TA15 titanium alloy wall panels. Background Art
[0002] The nominal composition of TA15 titanium alloy is Ti-6.5Al-2Zr-1Mo-1V, which is a near-α type medium-strength titanium alloy with a high Al equivalent. Its strengthening mechanism is mainly through the solid solution strengthening of the α-stable element Al. The addition of the neutral element Zr and the β-stable elements Mo and V can improve the process performance. TA15 titanium alloy has good corrosion resistance, excellent high-temperature strength, good thermal stability and plasticity, and is widely used in the stressed structures of aircraft.
[0003] The refinement of die forgings is the consistent development direction of the ordinary die forging industry to enhance product competitiveness, reduce processing costs, and promote technological progress. Its development trend is to promote the manufacturing of products with multi-process integration through more advanced means such as production intelligence, process automation, simulation, material innovation, and die optimization.
[0004] For a certain type of TA15 titanium alloy wall panel forging, serious folding defects are likely to occur in the traditional intermediate blank, which cannot meet the requirements of die forging refinement. Summary of the Invention
[0005] This application provides a forging method for TA15 titanium alloy wall panels and TA15 titanium alloy wall panels, which can improve the folding defects occurring in forging by improving the intermediate blank and meet the requirements of die forging refinement.
[0006] In a first aspect, this application provides a forging method for TA15 titanium alloy wall panels, the method comprising: obtaining a TA15 titanium alloy billet; forging the TA15 titanium alloy billet into an intermediate blank; the intermediate blank includes a cuboid part and a convex platform protruding from any one of the upper and lower top surfaces of the cuboid part; forging the intermediate blank to obtain a TA15 titanium alloy wall panel forging; the TA15 titanium alloy wall panel forging includes a first rib and a second rib; the first rib is higher than the second rib; the first rib and the second rib are obtained by die pressing the convex platform.
[0007] Optionally, the front and rear sides of the convex platform are both trapezoidal and are flush with the front and rear sides of the cuboid part respectively; the convex platform includes a first end and a second end distributed in sequence along the width direction of the cuboid part; the first end is higher than the second end; the first rib is obtained by die pressing the first end during the forging process; the second rib is obtained by die pressing the second end during the forging process.
[0008] Optionally, the convex platform includes a first trapezoidal convex platform at the first end and a second trapezoidal convex platform at the second end; the first trapezoidal convex platform is higher than the second trapezoidal convex platform.
[0009] Optionally, the height of the first rib is 162 mm.
[0010] Optionally, the height of the second rib is 40 mm.
[0011] Optionally, the forging process of forging the intermediate blank into a TA15 titanium alloy wall panel is numerically simulated, and the surface crack condition formed by forging is analyzed according to the results of the numerical simulation.
[0012] Optionally, the method further includes: numerically simulating the forging process of forging the initial intermediate blank into a TA15 titanium alloy wall panel, and analyzing the surface crack condition formed by forging according to the results of the numerical simulation; trapezoidal bosses of the same shape protrude from the upper and lower top surfaces of the rectangular parallelepiped part of the initial intermediate blank.
[0013] Optionally, the method further includes: performing ultrasonic flaw detection on the TA15 titanium alloy wall panel forging.
[0014] Optionally, before performing ultrasonic flaw detection on the TA15 titanium alloy wall panel forging, the method further includes: performing rough machining on the TA15 titanium alloy wall panel forging according to a preset rough machining allowance.
[0015] It should be understood that during the forging process of the traditional intermediate blank with convex platforms on both sides, the rib on the side with a lower forging height will have excessive metal accumulation due to more billet distribution. After cracks occur, the cracks are likely to close, ultimately resulting in the generation of folds.
[0016] The TA15 titanium alloy wall panel forging method provided by the present application can improve the intermediate blank with double-sided convex platforms into an intermediate blank with a single-sided convex platform, which can avoid excessive billet distribution at the rib on the side with a lower forging height, thereby avoiding excessive metal accumulation and avoiding the generation of folding defects.
[0017] In addition, the present application can use numerical simulation to assist in forging refinement, which can provide case materials for the process optimization ideas of the same type of products and avoid repeated exploration. Numerical simulation can visually simulate the forming process of the forging before actual production, discover possible problems in advance and optimize them, reducing the trial-and-error cost. At the same time, it accurately analyzes the metal flow, stress distribution, temperature field, etc., providing a scientific basis for refinement. In terms of the improvement of the intermediate blank and die design, it can visually demonstrate its rationality. Reducing the dependence on physical tests saves time, manpower, and material resources, shortens the product R & D cycle, and effectively controls costs.
[0018] In a second aspect, the present application provides a TA15 titanium alloy wall panel, which is forged by using the TA15 titanium alloy wall panel forging method described in the first aspect above.
[0019] The beneficial effects of the second aspect described above can be referred to those described in the first aspect above and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of a TA15 titanium alloy panel forging provided by an embodiment of the present application; Figure 2 It is a schematic structural diagram of the current intermediate blank provided by an embodiment of the present application; Figure 3 It is a schematic diagram of folding defects provided by an embodiment of the present application; Figure 4 It is a forging simulation schematic diagram of the intermediate blank with two-sided bosses provided by an embodiment of the present application; Figure 5 It is a schematic diagram of the intermediate blank with a single-sided boss and the mold provided by an embodiment of the present application; Figure 6 It is a schematic diagram of the forming simulation result of the intermediate blank with a single-sided boss provided by an embodiment of the present application; Figure 7 It is a physical diagram of a TA15 titanium alloy panel forging obtained by forging based on the improved intermediate blank provided by an embodiment of the present application; Figure 8 It is a physical diagram of the TA15 titanium alloy panel forging after rough machining provided by an embodiment of the present application; Figure 9 It is a schematic flowchart of a TA15 titanium alloy panel forging method provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0023] It should be noted that in the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplarily" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplarily" or "for example" is intended to present relevant concepts in a specific manner.
[0024] For the convenience of clearly describing the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. Those skilled in the art can understand that the words such as "first" and "second" do not limit the quantity and execution order.
[0025] The nominal composition of TA15 titanium alloy is Ti-6.5Al-2Zr-1Mo-1V, which is a medium-strength near-α titanium alloy with a high Al equivalent. Its strengthening mechanism is mainly through the solid solution strengthening of the α-stable element Al. The addition of the neutral element Zr and the β-stable elements Mo and V can improve the process performance. TA15 titanium alloy has good corrosion resistance, excellent high-temperature strength, good thermal stability and plasticity, and is widely used in the stressed structures of aircraft.
[0026] The refinement of die forgings is the consistent development direction for the ordinary die forging industry to enhance product competitiveness, reduce processing costs and promote technological progress. Its development trend is to promote the manufacturing of products with multi-process integration through more advanced means such as production intelligence, process automation, simulation, material innovation, and die optimization.
[0027] The TA15 titanium alloy panel studied in this application is a high-rib panel, which is an integral aircraft structural part made of a whole forging billet. The height of the relatively high ribs on one side of the finished part reaches 162 mm. There is no secondary connection after forming between the stringers and the skin of the overall panel. The relatively high rib side plays the role of bearing the weight of the aircraft and strengthening the structural strength.
[0028] For the forging of this type of TA15 titanium alloy panel, serious folding defects are likely to occur in the traditional intermediate billet, which cannot meet the requirements of die forging refinement.
[0029] First, the forging process of the traditional intermediate billet is studied and analyzed.
[0030] (1) Research object.
[0031] Exemplarily, Figure 1 is a schematic structural diagram of the TA15 titanium alloy panel forging provided by the embodiment of the present application. As Figure 1As shown, the wall plate is about 1000 mm long, the maximum dimension in the thickness direction is about 230 mm, and the net weight of a single forging is about 200 kg, which is a medium-sized die forging. The TA15 titanium alloy wall plate forging includes a higher rib on the left and a lower rib on the right.
[0032] (2) Current production status
[0033] In order to fill the deep cavities on both sides of the forging parting surface and simplify the intermediate billet making process, the intermediate billet is set as two side bosses of equal height during the initial design.
[0034] For example, Figure 2 This is a schematic diagram of the structure of the current intermediate billet provided in the embodiment of the present application. Figure 2 As shown, the main body of the current intermediate blank is a rectangular parallelepiped in the middle, and trapezoidal bosses with the same height are protruded on the upper and lower top surfaces of the rectangular parallelepiped. At this time, the weight of the intermediate blank is 265.3 kg.
[0035] However, during actual production, it was discovered that the intermediate billet had a design defect and a serious folding defect was found on the upper end surface of the forging.
[0036] For example, Figure 3 This is a schematic diagram of a folding defect provided in an embodiment of the present application. Figure 3 As shown in (a) in the figure, there is a folding defect between the higher ribs and the lower ribs, and the depth of the folding defect is more than 15 mm. Figure 3 As shown in (b), the forging body has been damaged after the folding defect has been polished and repaired, resulting in the final size of the product being out of tolerance.
[0037] (3) Scheme analysis
[0038] The intermediate blank with bosses on both sides does have advantages in deep cavity forming. However, for forgings with different rib heights on one side, excess metal will accumulate on the side with low ribs due to the larger distribution of blanks. After cracks are generated, cracks are prone to closure, which eventually leads to folding.
[0039] For example, Figure 4 This is a schematic diagram of the forging simulation of the intermediate blank of the two side bosses provided in the embodiment of the present application. Figure 4 As shown in the figure, after Deform-3D simulation analysis, the crack goes through the germination period, growth period, maturity period and closure period. The crack in the closure period is folding. When the excess metal reaches the peak value, it may even cause folding and closure to form internal cracks, which cannot be found from the surface of the forging, causing major quality risks.
[0040] This solution has inaccurate prediction of the metal flow law in a specific die, resulting in excessive filling of redundant metal in some parts of the forging. Through numerical simulation software, the forming situation of the intermediate blank can be better predicted, reducing the trial production risk and loss. The redundant metal increases the material cost, causing unnecessary waste. At the same time, it leads to the shape and size of the forging not meeting the requirements. The excessive metal causes local stress concentration in the forging, making it extremely easy to generate forging defects. Therefore, it is necessary to continue to optimize and refine this intermediate blank design solution.
[0041] (4)Intermediate blank optimization.
[0042] The height dimension of the lower rib of the above-mentioned TA15 titanium alloy panel is about 40 mm, and the material for this part can be added to the unilateral boss.
[0043] Exemplarily, Figure 5 is a schematic diagram of the unilateral boss intermediate blank and the die provided by the embodiment of the present application. As Figure 5 shown, the improved intermediate blank (i.e., Figure 5 the blank in the middle part) can have a boss protruding on one of the upper and lower top surfaces of the cuboid, and the die (i.e., the die above and below the middle part) is used for die forging of the intermediate blank with the single-sided boss.
[0044] Then, numerical simulation is carried out on the forging process of the improved unilateral boss intermediate blank.
[0045] Exemplarily, Figure 6 is a schematic diagram of the forming simulation result of the unilateral boss intermediate blank provided by the embodiment of the present application. As Figure 6 shown, surface crack conditions of the blank are found in the simulation results. At the same time, the blank for this forging is refined to 241.8 kg, which is nearly 10% less refined material than the double-sided boss solution.
[0046] (5)Production verification.
[0047] Exemplarily, Figure 7 is a physical drawing of the TA15 titanium alloy panel forging obtained based on the improved intermediate blank provided by the embodiment of the present application. As Figure 7 shown, no folding defects are found on the surface of the TA15 titanium alloy panel forging obtained based on the improved intermediate blank.
[0048] Exemplarily, Figure 8 is a physical drawing of the TA15 titanium alloy panel forging after rough machining provided by the embodiment of the present application. As Figure 8 shown, after rough machining the TA15 titanium alloy panel forging according to the preset rough machining allowance and performing ultrasonic flaw detection, no internal cracks are found. Therefore, this intermediate blank design solution is reasonable and feasible.
[0049] Based on the understanding of the above embodiments, an embodiment of the present application provides a forging method for TA15 titanium alloy wall panels. Figure 9 It is a schematic flow chart of the forging method for TA15 titanium alloy wall panels provided by the embodiment of the present application. As Figure 9 shown, the method includes the following steps: S101. Obtain a TA15 titanium alloy billet.
[0050] For example, a cuboid-shaped TA15 titanium alloy billet can be obtained.
[0051] S102. Forge the TA15 titanium alloy billet into an intermediate blank.
[0052] Among them, the intermediate blank includes a cuboid part and a convex platform protruding from any one of the upper and lower top surfaces of the cuboid part.
[0053] For example, the intermediate blank in S102 can refer to the intermediate blank shown above Figure 5 and will not be elaborated here.
[0054] S103. Forge the intermediate blank to obtain a TA15 titanium alloy wall panel forging.
[0055] Among them, the TA15 titanium alloy wall panel forging includes a first rib and a second rib. The first rib is higher than the second rib. The first rib and the second rib are obtained by die pressing the convex platform. The specific structure of the TA15 titanium alloy wall panel forging can refer to the above Figure 1 shown. The first rib is also the higher rib on the left side above Figure 1 , and the second rib is also the lower rib on the right side in Figure 1 .
[0056] For example, the height of the first rib can be specifically 162 mm.
[0057] For another example, the height of the second rib can be specifically 40 mm.
[0058] In some embodiments, the front and rear sides of the unilateral convex platform are both trapezoidal and are flush with the front and rear sides of the cuboid part respectively; the convex platform includes a first end and a second end distributed in sequence along the width direction of the cuboid part; the first end is higher than the second end; the first rib is obtained by die pressing the first end during the forging process; the second rib is obtained by die pressing the second end during the forging process.
[0059] For example, the unilateral convex platform can include two adjacent trapezoidal convex platforms. That is, the convex platform in the intermediate blank can include a first trapezoidal convex platform at the first end and a second trapezoidal convex platform at the second end, and the first trapezoidal convex platform is higher than the second trapezoidal convex platform.
[0060] In some possible embodiments, before S101, a numerical simulation can also be performed on the forging process of forging the intermediate blank into a TA15 titanium alloy panel, and the surface crack situation formed by forging can be analyzed according to the results of the numerical simulation. The specific numerical simulation process and results can be referred to the above Figure 6 as described in the place, and will not be elaborated here.
[0061] In some possible embodiments, before S101, a numerical simulation can also be performed on the forging process of forging the initial intermediate blank into a TA15 titanium alloy panel, and the surface crack situation formed by forging can be analyzed according to the results of the numerical simulation; trapezoidal bosses of the same shape protrude from both the upper and lower top surfaces of the rectangular part of the initial intermediate blank. The initial intermediate blank is also the above Figure 2 the intermediate blank including the two side bosses shown in. The process of performing a numerical simulation on the forging process of forging the initial intermediate blank into a TA15 titanium alloy panel can be referred to the above Figure 4 as described in the place, and will not be elaborated here.
[0062] In some possible embodiments, after forging the TA15 titanium alloy panel forging, ultrasonic flaw detection can also be performed on the TA15 titanium alloy panel forging.
[0063] Optionally, before performing ultrasonic flaw detection on the TA15 titanium alloy panel forging, rough machining can also be performed on the TA15 titanium alloy panel forging according to a preset rough machining allowance. The specific processes and results of rough machining and ultrasonic flaw detection can be referred to the above Figure 8 as described in the place, and will not be elaborated here.
[0064] It should be understood that in the forging process of the traditional intermediate blank with two side bosses, due to more blank material distribution on the rib with a lower forging height, redundant metal accumulation will occur, and it is easy for the crack to close after the crack occurs, ultimately resulting in the generation of folds.
[0065] The TA15 titanium alloy panel forging method provided by the embodiments of the present application can improve the intermediate blank with two side bosses to an intermediate blank with one side boss, which can avoid excessive blank material distribution at the rib with a lower forging height, thereby avoiding redundant metal accumulation, and thus avoiding the generation of fold defects.
[0066] The above introduces the technical solutions provided by the embodiments of the present application from the perspective of the method. In an exemplary embodiment, the embodiments of the present application also provide a TA15 titanium alloy panel, and the TA15 titanium alloy panel is forged by using the TA15 titanium alloy panel forging method provided in the above method embodiment.
[0067] Based on the understanding of the above embodiments, the following conclusions can be drawn: This application can use numerical simulation to assist in the refinement of forgings, providing case materials for the process optimization ideas of similar products and avoiding repeated exploration. Numerical simulation can visually simulate the forming process of forgings before actual production, discover potential problems in advance and optimize them, reducing the cost of trial and error. At the same time, it accurately analyzes the metal flow, stress distribution, temperature field, etc., providing a scientific basis for refinement. In terms of the improvement of intermediate blanks and die design, it can visually demonstrate its rationality. Reducing the dependence on physical tests saves time, manpower, and material resources, shortens the product R & D cycle, and effectively controls costs.
[0068] Although the present application has been described in conjunction with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present application. Accordingly, the present specification and the drawings are merely exemplary illustrations of the present application defined by the appended claims, and are considered to have covered any and all modifications, variations, combinations, or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.
[0069] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A TA15 titanium alloy wall plate forging method, characterized in that: The method comprises: Obtain TA15 titanium alloy block; Forging the TA15 titanium alloy block into an intermediate billet; the intermediate billet comprises a rectangular parallelepiped portion and a boss protruding from any one of the upper and lower top surfaces of the rectangular parallelepiped portion; The intermediate billet is forged to obtain a TA15 titanium alloy wall panel forging; the TA15 titanium alloy wall panel forging comprises a first rib and a second rib; the first rib is higher than the second rib; the first rib and the second rib are obtained by die pressing the boss.
2. The method according to claim 1, characterized in that The front and rear side surfaces of the boss are both trapezoidal and are respectively flush with the front and rear side surfaces of the rectangular portion; the boss includes a first end and a second end sequentially distributed along the width direction of the rectangular portion; the first end is higher than the second end; the first rib is obtained by molding the first end during the forging process; the second rib is obtained by molding the second end during the forging process.
3. The method according to claim 1, characterized in that The boss includes a first trapezoidal boss located at the first end and a second trapezoidal boss located at the second end; the first trapezoidal boss is higher than the second trapezoidal boss.
4. The method according to claim 1, characterized in that: The height of the first rib is 162 mm.
5. The method according to claim 1, characterized in that: The height of the second rib is 40 mm.
6. The method according to claim 1, characterized in that A numerical simulation is performed on the forging process of forging the intermediate billet into the TA15 titanium alloy wall plate, and surface cracks formed by forging are analyzed based on the results of the numerical simulation.
7. The method according to claim 1, characterized in that The method also includes: numerically simulating the forging process of forging the initial intermediate billet into the TA15 titanium alloy wall plate, and analyzing the surface cracks formed by forging according to the results of the numerical simulation; the upper and lower top surfaces of the rectangular part of the initial intermediate billet are both protruded with the same trapezoidal bosses.
8. The method according to claim 1, characterized in that: The method further comprises: The TA15 titanium alloy wall plate forgings are subjected to ultrasonic flaw detection.
9. The method according to claim 8, characterized in that Before performing ultrasonic flaw detection on the TA15 titanium alloy wall plate forging, the method further comprises: The TA15 titanium alloy wall plate forging is rough-machined according to a preset rough-machining allowance.
10. A TA15 titanium alloy wall panel, characterized in that: The TA15 titanium alloy wall panel is forged by the forging method described in any one of claims 1 to 9.