Short-process high-stability forging method for multi-branch complex special-shaped frame
By optimizing geometric parameters and setting a V-shaped complex frame short process forging method, the instability and performance quality problems in traditional forging are solved, and high-stability and high-quality forging effects are achieved.
Patent Information
- Application Number
- CN202510312281.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-06-03
AI Technical Summary
The blank making process of traditional titanium alloy forgings is unstable, the forging process is long and the performance and quality problems are serious. Especially in the forging of multi-branched special-shaped frames, it is difficult to meet the demand for high-stable and high-quality products of the aerospace industry.
The short-process high-stability forging method of multi-branch complex special-shaped frame is adopted. By optimizing geometric parameters design and setting the V-shaped skin structure, the forging fire times are shortened and the forging stability and mechanical properties are improved.
The forging fire times have been greatly shortened, from the traditional 16 fire to 6 fires, improving the stability, mechanical properties and quality of the final forging, reducing energy consumption and cost.
Smart Images
Figure CN120079796A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of forging. Specifically, it relates to a short-process and high-stability forging method for a multi-branch complex-shaped frame. Background Art
[0002] Titanium alloy materials have the advantages of light weight, good corrosion resistance, and high specific strength, and are widely used in key components in the aerospace industry, accounting for more than 20% in some aircraft. Titanium alloys are mainly used in load-bearing structures such as the main frame structure of the aircraft fuselage and centralized joints. Titanium alloys can be divided into wrought titanium alloys, cast titanium alloys, and powder metallurgy titanium alloys according to the preparation process. Among them, forging is the most widely used forming method so far.
[0003] Most early titanium alloy forgings were mainly produced by hammer forging. At that time, the process technology level and concept followed the traditional route. The blank design before die forging was complex, and coupled with insufficient equipment capacity, the number of heating operations for blank making was large, and there was little tooling control in the intermediate processes. There were large fluctuations and instabilities in the control of the forging from the appearance dimensions to the microstructure and properties, and defects and performance problems occurred frequently. With the successive commissioning of large presses in China, the forging method has also changed greatly. The traditional rapid hammer forging high-strain deformation method has gradually been replaced by the slow press low-strain deformation method. For titanium alloys, large presses and slow low-strain methods can match a larger deformation amount, and the same high-performance indicators can be achieved. By using tooling and dies to ensure the shape of the intermediate blank, forging defects can be avoided and the number of forging heating operations can be reduced, laying the foundation for a short process. With the requirements for batch delivery of aviation products, there are bottlenecks in the instability of the blank making process, the long forging process, and the performance and quality problems of forgings in the traditional process. Especially for multi-branch shaped frames used in aircraft fuselage structures (such as wings, tails, etc.), there is an urgent need to develop a short-process forging technology for complex-shaped frames to meet the user's requirements for high-stability and high-quality products. Summary of the Invention
[0004] In order to solve the above problems, the present invention aims to provide a short-process and high-stability forging method for a multi-branch complex-shaped frame, reducing the number of forging heating operations from 16 to 6 from the bar stock to the final forging, greatly shortening the forging heating operations, and at the same time improving the forging stability, mechanical properties, and quality of the final forging.
[0005] To achieve the above object, the technical solution adopted by the present invention is:
[0006] A short-process and high-stability forging method for a multi-branch complex-shaped frame disclosed by the present invention includes the following steps:
[0007] Step 1. Design the final forging according to the outer contour of the multi-branch complex-shaped frame. The height of the final forging branches of the final forging is h, the width is b, h / b ≤ 2.5, and the draft angle of the final forging branches is e, 5° ≤ e ≤ 10°;
[0008] Step 2. Design the pre-forging according to the outer contour of the final forging. The height of the pre-forging branches of the pre-forging is H, the width is B, H / B ≤ 2, and the draft angle of the pre-forging branches is E, 15° ≤ E ≤ 25°;
[0009] Step 3. Set a V-shaped web structure at the opening position between adjacent pre-forging branches at the forging end of the pre-forging. The pre-forging is formed by forging a free-forging blank. By means of numerical simulation, analyze the forming process of the pre-forging forged from the free-forging blank, and repeatedly iterate the V-shaped web structure and the outer contour of the free-forging blank to determine the theoretical free-forging blank;
[0010] Step 4. Select a bar stock according to the outer contour of the theoretical free-forging blank;
[0011] Step 5. Forge the bar stock into the free-forging blank, and the number of forging passes for forging the bar stock into the free-forging blank is less than or equal to 4 passes;
[0012] Step 6. Forge the free-forging blank into the pre-forging in one forging pass, and retain the V-shaped web structure at the opening position between adjacent pre-forging branches at the forging end of the pre-forging;
[0013] Step 7. Forge the pre-forging in one forging pass, remove the V-shaped web structure and fill the pre-forging branches, and finally complete the forming of the final forging.
[0014] Further, the thickness of the thinnest position of the V-shaped web structure is T, 5 mm ≤ T ≤ 20 mm.
[0015] Further, the included angle between the upper surface and the lower surface of the V-shaped web structure is α, 10° ≤ α ≤ 25°.
[0016] Further, the concave fillet radius of the pre-forging is R, and the concave fillet radius of the final forging is r, 1.5 ≤ R / r ≤ 2.5.
[0017] Further, the height h of the final forging branches and the height H of the pre-forging branches satisfy h / H ≥ 1.25.
[0018] Further, the numerical simulation analysis includes the simulation optimization of metal flow, stress distribution and defect prediction during the forming process of the pre-forging.
[0019] Furthermore, the outer contour of the open-die forging blank is a cuboid.
[0020] Furthermore, the material of the bar stock is titanium alloy, steel or superalloy.
[0021] The beneficial effects of the present invention are as follows:
[0022] The short-process high-stability forging method for a multi-branch complex-shaped frame provided by the present invention, during the forging process of the multi-branch complex-shaped frame, through the optimization design of geometric parameters such as the relationship between the height and width of the branches of the final forging h / b ≤ 2.5, the relationship between the height and width of the branches of the pre-forging H / B ≤ 2, the draft angle of the branches of the final forging 5° ≤ e ≤ 10°, the draft angle of the branches of the pre-forging 15° ≤ E ≤ 25°, etc., and the setting of a V-shaped web structure at the opening position between adjacent branches at the forging end of the pre-forging, the number of forging heats from the bar stock to the open-die forging blank is reduced to 4 heats. Compared with bending, the number of forging heats from the open-die forging blank to the final forging is reduced to 2 heats. The number of forging heats from the bar stock to the final forging is shortened from the traditional 16 heats to 6 heats, and the number of controlled heats is reduced by more than 60%. The forging heats of the multi-branch complex-shaped frame are significantly shortened, greatly shortening the forging cycle, reducing energy consumption, equipment maintenance and labor costs; through the optimization design of geometric parameters, the geometric parameters of the pre-forging and the final forging are highly matched, improving the material utilization rate and reducing the forging cost, while being beneficial to the filling of the pre-forging; the setting of the V-shaped web structure optimizes the filling and deformation distribution of the pre-forging, increasing the tensile strength by 21 MPa, doubling the process control ability of the tensile strength, reducing the coefficient of variation of the tensile strength, enhancing the tensile strength, and improving the stability, consistency, mechanical properties and quality of the final forging of the multi-branch complex-shaped frame. This application is applicable to the short-process high-stability forging of multi-branch complex-shaped frames, and is particularly suitable for the mass production of titanium alloy and superalloy structural parts in the fields of aviation, aerospace, etc. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0024] Figure 1 is the process flow chart of a short-process high-stability forging method for a multi-branch complex-shaped frame provided by an embodiment of the present invention;
[0025] Figure 2 is the process flow chart of the forging method for a multi-branch complex-shaped frame provided traditionally;
[0026] Figure 3It is the front view of the pre-forged part provided by the embodiment of the present invention;
[0027] Figure 4 is Figure 3 the sectional view of section A;
[0028] Figure 5 is Figure 3 the sectional view of section B;
[0029] Figure 6 It is the comparison diagram of the pre-forged branch and the final-forged branch provided by the embodiment of the present invention.
[0030] Reference numerals:
[0031] Bar stock 100, free forging blank 200, pre-forged part 300, V-shaped web structure 301, pre-forged branch 302, final-forged part 400, final-forged branch 401. Specific embodiments
[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.
[0033] The present invention will be further described below in conjunction with the drawings and embodiments.
[0034] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 shown, this embodiment provides a short-process and high-stability forging method for a multi-branch complex-shaped frame, such as forging and forming a branch-shaped frame with three or four or more positive integers of branches. Step 1: Design the final-forged part 400 according to the outer contour of the multi-branch complex-shaped frame. The height of the final-forged branch 401 of the final-forged part 400 is h, the width of the final-forged branch 401 is b, h / b ≤ 2.5, and the draft angle of the final-forged branch 401 is e, 5° ≤ e ≤ 10°;
[0035] Step 2: Design the pre-forged part 300 according to the outer contour of the final-forged part 400. The height of the pre-forged branch 302 of the pre-forged part 300 is H, the width of the pre-forged branch 302 is B, H / B ≤ 2, and the draft angle of the pre-forged branch 302 is E, 15° ≤ E ≤ 25°;
[0036] Step 3. A V-shaped web structure 301 is arranged at the opening position between adjacent pre-forging branches 302 at the forging end of the pre-forging 300. The pre-forging 300 is formed by forging a free-forging blank 200. According to the design criteria of ensuring the complete filling of the pre-forging 300, reasonable distribution of the deformation amount, and stable positioning of the free-forging blank 200, by means of numerical simulation to analyze the forming process of forging the pre-forging 300 from the free-forging blank 200, the V-shaped web structure 301 and the outer contour of the free-forging blank 200 are repeatedly iterated, so as to determine the theoretical free-forging blank;
[0037] Step 4. Select a bar stock 100 according to the outer contour of the theoretical free-forging blank;
[0038] Step 5. Forge (die-forge) the bar stock 100 into the free-forging blank 200, and the number of forging (die-forging) forming heats for forging the bar stock 100 into the free-forging blank 200 is less than or equal to 4 heats;
[0039] Step 6. Forge (die-forge) the free-forging blank 200 in 1 heat into the pre-forging 300, and the V-shaped web structure 301 is retained at the opening position between adjacent pre-forging branches 302 at the forging end of the pre-forging 300;
[0040] Step 7. Forge (die-forge) the pre-forging 300 in 1 heat, remove the V-shaped web structure 301 and fill the pre-forging branches 302, and finally complete the forming of the finish-forging 400.
[0041] Based on the above short - process and high - stability forging method for a multi - branched complex - shaped frame, during the forging process of the multi - branched complex - shaped frame, through the geometric parameter optimization design such as the height - to - width ratio of the branches 401 of the final forging h / b ≤ 2.5, the height - to - width ratio of the branches 302 of the pre - forging H / B ≤ 2, the draft angle of the branches 401 of the final forging 5° ≤ e ≤ 10°, the draft angle of the branches 302 of the pre - forging 15° ≤ E ≤ 25°, and by setting a V - shaped web structure 301 at the opening position between adjacent branches at the forging end of the pre - forging 3, the number of forging heats from the bar stock 100 to the free - forging blank 200 is reduced to 4 heats. Compared with bending, the number of forging heats from the free - forging blank 200 to the final forging 400 is reduced to 2 heats. The number of forging heats from the bar stock 100 to the final forging 400 is shortened from the traditional 16 heats to 6 heats, and the number of controlled heats is reduced by more than 60%. This significantly shortens the forging heats of the multi - branched complex - shaped frame, greatly shortens the forging cycle, reduces energy consumption, equipment maintenance, and labor costs. The geometric parameter optimization design makes the geometric parameter height matching degree between the pre - forging 300 and the final forging 400, improves the material utilization rate, reduces the forging cost, and is conducive to the filling of the pre - forging 300. The setting of the V - shaped web structure 301 optimizes the filling and deformation distribution of the pre - forging 300, increases the tensile strength by 21 MPa, doubles the process control ability of the tensile strength, reduces the coefficient of variation of the tensile strength, enhances the tensile strength, and improves the stability, consistency, mechanical properties, and quality of the final forging of the multi - branched complex - shaped frame. This application is applicable to the short - process and high - stability forging of multi - branched complex - shaped frames, especially suitable for the mass production of titanium alloy and superalloy structural parts in the fields of aviation, aerospace, etc.
[0042] As an implementable mode, as Figure 1 、 Figure 3 、 Figure 4 shown, the thickness of the thinnest position of the V - shaped web structure 301 is T, and 5 mm ≤ T ≤ 20 mm.
[0043] The thickness of the thinnest position of the V - shaped web structure 301 is between 5 mm and 20 mm, such as 5 mm or 10 mm or 15 mm or 20 mm, which can distribute the material of the free - forging blank 200, simplify the design of the free - forging blank 200, and reduce material consumption.
[0044] As an implementable mode, as Figure 1 、 Figure 3 、 Figure 4 shown, the angle between the upper surface and the lower surface of the V - shaped web structure 301 is α, and 10° ≤ α ≤ 25°.
[0045] The included angle between the upper surface and the lower surface of the V-shaped web structure 301 is between 10° and 25°, such as 10° or 15° or 20° or 25°, which can divide the free-forging blank 200, simplify the design of the free-forging blank 200, and reduce material consumption.
[0046] As an implementable mode, such as Figure 1 , Figure 3 , Figure 6 shown, the concave fillet radius of the pre-forging part 300 is R, and the concave fillet radius of the finish-forging part 400 is r, and 1.5 ≤ R / r ≤ 2.5.
[0047] The concave fillet of the pre-forging part 300 is the root fillet of the pre-forging branch 302 of the pre-forging part 300, and the concave fillet of the finish-forging part 400 is the root fillet of the finish-forging branch 401 of the finish-forging part 400. The concave fillet radius R of the pre-forging part 300 is greater than the concave fillet radius r of the finish-forging part 400. For example, the concave fillet radius R of the pre-forging part 300 is between 1.5 times and 2.5 times that of the concave fillet radius r of the finish-forging part 400, that is, 1.5 ≤ R / r ≤ 2.5. For example, the concave fillet radius R of the pre-forging part 300 is 1.5 times or 2 times or 2.5 times that of the concave fillet radius r of the finish-forging part 400. The smaller the multiple, the easier it is to forge. If it is too small, it will affect the filling and deformation distribution of the V-shaped web structure 301 to the pre-forging part 300, thus affecting the quality of the finish-forging part 400.
[0048] As an implementable mode, such as Figure 1 , Figure 3 , Figure 6 shown, the height h of the finish-forging branch 401 and the height H of the pre-forging branch 302 satisfy h / H ≥ 1.25.
[0049] The height h of the finish-forging branch 401 is more than 1.25 times that of the height H of the pre-forging branch 302, that is, h / H ≥ 1.25, which is beneficial to forging. If the multiple is too small, it will affect the filling and deformation distribution of the V-shaped web structure 301 to the pre-forging part 300, thus affecting the quality of the finish-forging part 400.
[0050] As an implementable mode, such as Figure 1 , Figure 3 shown, the numerical simulation analysis includes the simulation optimization of metal flow, stress distribution and defect prediction during the forming process of the pre-forging part 300, and repeatedly iterates the outer contour of the V-shaped web structure 301 and the free-forging blank 200 to determine the theoretical free-forging blank.
[0051] Through DEFORM-3D or FORGE modeling, inputting process parameters, simulation running, data processing optimization, and re-simulation iteration for numerical simulation analysis of the characteristics such as metal flow, stress distribution and defects of the pre-forging part 300 and the free-forging blank 200, a better theoretical free-forging blank is obtained, and the quality of the finish-forging part 400 is improved.
[0052] As an implementable mode, as Figure 1 shown, the outer contour of the open-die forging blank 200 is a cuboid.
[0053] The outer contour of the open-die forging blank 200 is selected as a cuboid or a cube according to the requirements of production design. The four-branch complex-shaped titanium frame parts of the present application are used for aircraft fuselage structure frames (such as wings, tail fins, etc.), and the outer contour of the open-die forging blank 200 is designed as a cuboid.
[0054] As an implementable mode, as Figure 1 shown, the material of the bar stock 100 is titanium alloy or steel or superalloy.
[0055] The short-process and high-stability forging method of the multi-branch complex-shaped frame of the present application can be used for forging multi-branch complex-shaped frames of titanium alloy (such as TC4 titanium alloy) or steel or superalloy materials (such as iron-based superalloy materials, nickel-based superalloy materials).
[0056] Specifically, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 shown, for a cuboid with an outer contour size of 1850mm×920mm×245mm, a complex-shaped titanium frame part with four branches at the four corner positions is forged for use in an aircraft fuselage structure frame (such as wings, tail fins, etc.). The forging steps are as follows:
[0057] S1. Design a pre-forging part 300 according to the outer contour of the part. The ratio of the height to the width of the final-forging branch 401 of the final-forging part 400 is h / b = 2, and the draft angle e of the final-forging branch 401 is 7°.
[0058] S2. Design a pre-forging part 300 according to the outer contour of the final-forging part 400 in step S1. The ratio of the height to the width of the pre-forging branch 302 of the pre-forging part 300 is H / B = 1.5, the draft angle E of the pre-forging branch 302 is 20°, and the concave fillet radius R of the pre-forging part 300 is twice the concave fillet radius r of the final-forging part 400, that is, R = 2r.
[0059] S3. At the opening positions between adjacent pre-forging branches 302 at the forging end of the pre-forging 300 in step S2 (between the two left pre-forging branches 302 and between the two right pre-forging branches 302), a V-shaped web structure 301 is provided. By numerically simulating and analyzing the forming process from the free forging blank 200 to the pre-forging 300, the free forging blank 200 design and the V-shaped web structure 301 design are iteratively determined to obtain the theoretical free forging blank. The smaller the angle α between the upper surface and the lower surface of the V-shaped web structure 301 and the thickness at the thinnest position of the V-shaped web structure 301, the less the padding, but it is not conducive to the material distribution of the free forging blank 200 and the filling of the pre-forging branches 302. The angle α between the upper surface and the lower surface of the V-shaped web structure 301 is 18°, and the thickness T at the thinnest position of the V-shaped web structure 301 is 5 mm. The free forging blank 200 is designed as a simple cuboid for easy preparation.
[0060] S4. According to the outer contour of the theoretical free forging blank in step S3, the diameter of the bar stock 100 is selected to be 400 mm.
[0061] S5. The bar stock 100 in step S4 is die-forged and stamped or directly upset and spread in the die of a large press to become the free forging blank 200. The number of forging passes for forging the bar stock 100 into the free forging blank 200 is less than or equal to 4 passes. This die includes an upper die and a lower die. The upper die uses a flat die, and the lower die uses a die matching the outer contour of the free forging blank 200.
[0062] S6. The free forging blank 200 in step S5 is die-forged in the die of a large press in 1 pass to become the pre-forging 300. At the opening positions between adjacent pre-forging branches 302 at the forging end of the pre-forging 300, the material is distributed, extruded, and the V-shaped web structure 301 is retained. This die includes an upper die and a lower die. The upper die uses a die matching the outer contour of the final forging 400. Punches are respectively arranged at the left and right ends of the upper die. The punch is in a frustum structure and is divided into upper and lower sections. The upper section accounts for one-third of the punch length and is the upper end of the punch, and the lower section accounts for two-thirds of the punch length and is the lower end of the punch. The upper end of the punch corresponds and cooperates with the opening between adjacent final forging branches 401, and the lower end of the punch corresponds and cooperates with the opening between adjacent pre-forging branches 302. The lower die uses a die matching the outer contour of the final forging 400, and the structure is similar to that of the upper die. The free forging blank 200 is placed on the lower die matching the outer contour of the final forging 400 after 1 pass. The upper die is pressed on the free forging blank 200. The large press stamps the upper die, and the V-shaped web structure 301 is gradually formed at the position corresponding to the punch of the free forging blank 200. When the punch is pressed down by two-thirds, the pre-forging branches 302 are formed on both sides of the V-shaped web structure 301 to form the pre-forging 300. The pre-forging 300 is taken off the die.
[0063] S7. Place the pre-forged part 300 in step S6 on the lower die after one heat treatment. Press the upper die onto the pre-forged part 300. The punch is opposite to the corresponding V-shaped web structure 301. The large press continues to stamp the upper die to fill the pre-forged branch 302. The pre-forged branch 302 is gradually formed into the final-forged branch 401. The punch presses down entirely, and the pre-forged branch 302 is formed into the final-forged branch 401. Remove the V-shaped web structure 301 with a cutting machine. Finally, the forming of the final-forged part 400 is completed, and the forging of the special-shaped titanium frame part with four complex-shaped branches is completed. Polish and grind the titanium frame of the four-branch final-forged part 400 to finally complete the manufacturing of the special-shaped titanium frame part with four complex-shaped branches.
[0064] The special-shaped titanium frame parts with four complex-shaped branches completed through the above steps S1 - S7 are used in the aircraft fuselage structure frame (such as the wing, tail wing, etc.). The number of forging heats from the billet 100 to the final-forged part 400 is shortened from the traditional 16 heats to 6 heats, and the controlled number of heats is reduced by more than 60%, greatly shortening the forging heats of the multi-branch complex special-shaped frame. The average tensile strength of the special-shaped titanium frame parts with four-branch complex shapes made by this forging method is 1014 MPa, the process control ability of the tensile strength is 1.56, and the coefficient of variation of the tensile strength is 2.27. The average tensile strength of the forgings made by the traditional forging method is 993 MPa, the process control ability of the tensile strength is 0.83, and the coefficient of variation of the tensile strength is 3.57. Compared with the traditional forging method, the tensile strength of the special-shaped titanium frame parts with four complex-shaped branches forged by this forging method is increased by 21 MPa, the process control ability of the tensile strength is doubled, and the coefficient of variation of the tensile strength is reduced, greatly improving the stability, consistency, mechanical properties and quality of the complex special-shaped titanium frame parts.
[0065] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.
Claims
1. A short-process high-stability forging method for a multi-branch complex special-shaped frame, characterized in that: The following steps are involved: Step 1, designing a final forging (400) according to the outer contour of a complex special-shaped frame with multiple branches, wherein the height of the final forged branches (401) of the final forging (400) is h, the width of the final forged branches (401) is b, h / b≤2.5, and the draft angle of the final forged branches (401) is e, 5°≤e≤10°; Step 2: designing a pre-forged piece (300) according to the outer contour of the final forged piece (400), wherein the height of the pre-forged branch (302) of the pre-forged piece (300) is H, the width of the pre-forged branch (302) is B, H / B≤2, and the draft angle of the pre-forged branch (302) is E, 15°≤E≤25°; Step 3: a V-shaped skin-connected structure (301) is provided at an opening position between adjacent pre-forged branches (302) at the forging end of the pre-forged piece (300), the pre-forged piece (300) is forged from a free forging blank (200), a forming process of the pre-forged piece (300) forged from the free forging blank (200) is analyzed by numerical simulation, and the outer contours of the V-shaped skin-connected structure (301) and the free forging blank (200) are repeatedly iterated, so as to determine a theoretical free forging blank; Step 4, selecting a bar material (100) according to the outer contour of the theoretical free forging blank; Step 5, forging the bar (100) into the free forging blank (200), wherein the number of forging forming fires of the bar (100) into the free forging blank (200) is less than or equal to 4 fires; Step 6: Processing the free forging blank (200) into the preforged part (300) by one-fire forging, and retaining the V-shaped skin-connected structure (301) at the opening position between the adjacent preforged branches (302) at the forging end of the preforged part (300); Step 7: The pre-forged piece (300) is subjected to one-fire forging to remove the V-shaped skin structure (301) and fill the pre-forged branches (302), thereby finally completing the formation of the final forged piece (400).
2. A short-process high-stability forging method for a multi-branch complex special-shaped frame according to claim 1, characterized in that: The thinnest position thickness of the V-shaped skin-linked structure (301) is T, 5mm≤T≤20mm.
3. A short-process high-stability forging method for a multi-branch complex special-shaped frame according to claim 2, characterized in that: The angle between the upper surface and the lower surface of the V-shaped skin-linked structure (301) is α, 10°≤α≤25°.
4. The short-process high-stability forging method of a multi-branch complex special-shaped frame according to claim 1 is characterized in that: The concave fillet radius of the pre-forged piece (300) is R, the concave fillet radius of the final forged piece (400) is r, and 1.5≤R / r≤2.
5.
5. The short-process high-stability forging method of a multi-branch complex special-shaped frame according to claim 1 is characterized in that: The height h of the final forged branches (401) and the height H of the pre-forged branches (302) satisfy h / H≥1.
25.
6. The short-process high-stability forging method of a multi-branch complex special-shaped frame according to claim 1 is characterized in that: The numerical simulation analysis includes simulation optimization of metal flow, stress distribution and defect prediction during the forming process of the pre-forging (300).
7. A short-process high-stability forging method for a multi-branch complex special-shaped frame according to claim 1, characterized in that: The free forging blank (200) has a rectangular parallelepiped outline.
8. The short-process high-stability forging method for a multi-branch complex special-shaped frame according to claim 1 is characterized in that: The material of the bar material (100) is titanium alloy, steel or high-temperature alloy.