A method for improving the quasi-beta forging deformation uniformity of a titanium alloy T-shaped cross-section forging

Abstract

The present application mainly relates to a method for improving the deformation uniformity of titanium alloy T-section forgings in quasi-beta forging, comprising the following steps: step 1: adding pit structures and convex structures on the conventional cuboid slab; step 2: performing numerical simulation on the improved slab in quasi-beta forging forming through simulation software; and step 3: performing quasi-beta forging forming processing on the improved slab. The pit structures can make the metal material flow into the die cavity at the rib in a reverse deformation manner, thereby increasing the deformation amount of the rib forming area of the titanium alloy T-section forging; and the convex structures can increase the metal material of the opposite area of the rib forming of the forging, and make the deformation amount of the area increase in a reverse deformation manner. The improved slab can significantly increase the deformation amount of the rib forming area and the opposite area of the rib forming of the titanium alloy T-section forging in quasi-beta forging, so that the deformation uniformity of the forging in quasi-beta forging is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of titanium alloy plastic forming, and particularly relates to a method for improving quasi-beta forging deformation uniformity of a titanium alloy T-shaped cross-section forging. BACKGROUND

[0002] For the titanium alloy T-shaped cross-section forging, the deformation amount of the quasi-beta forging process has a crucial influence on the organization and performance. When the quasi-beta forging is performed on the titanium alloy T-shaped cross-section forging using a cuboid-shaped blank, the deformation after the forging is extremely uneven, and cannot meet the requirement of the quasi-beta forging on the deformation uniformity. Figure 3 As shown in FIG. a, the overall deformation amount of the first improved region of the conventional titanium alloy T-shaped cross-section forging is small, because in the T-shaped rib forming process at the initial stage of the forging, only small deformation is generated in the first improved region, and in the process of continuously pressing the upper die, the metal material in the first improved region is only rigidly moved upward. In addition, due to a large amount of metal flowing into the first improved region of the forging, the metal in the second improved region is passively supplemented to flow in, forming a concave, so that the deformation amount of the second improved region of the forging is extremely small, forming a difficult-to-deform region. SUMMARY

[0003] In view of the deficiencies of the prior art, the application provides a method for improving the quasi-beta forging deformation uniformity of a titanium alloy T-shaped cross-section forging, which can effectively improve the deformation amount of the quasi-beta forging of the rib forming region and the opposite region of the rib forming of the titanium alloy T-shaped cross-section forging, so as to obtain a titanium alloy forging with uniform deformation and up-to-standard performance.

[0004] The application provides a method for improving the quasi-beta forging deformation uniformity of a titanium alloy T-shaped cross-section forging, which comprises the following steps:

[0005] Step 1: improving the structure of the quasi-beta forging blank, and adding a pit structure and a convex structure on the conventional cuboid blank;

[0006] Step 2: performing numerical simulation on the quasi-beta forging forming of the improved blank by using a simulation software, so that the overall deformation amount of the titanium alloy T-shaped cross-section forging obtained after the improved blank is subjected to the quasi-beta forging is within the effective deformation range of 20% to 40%;

[0007] Step 3: performing quasi-beta forging forming processing on the improved blank.

[0008] Preferably, in step 1, the pit structure is added to the first improved region of the titanium alloy T-shaped cross-section forging, and the convex structure is added to the second improved region of the forging.

[0009] Preferably, the structure size parameters of the blank include a pit arc radius, a pit arc center distance, a convex arc radius and a convex arc center distance; wherein the pit arc radius is in a range of 90mm-120mm, the pit arc center distance is in a range of 60mm-90mm, the convex arc radius is in a range of 100mm-130mm, and the convex arc center distance is in a range of 60mm-90mm; the bottom of the pit structure adopts a convex fillet transition structure, wherein the convex fillet radius is in a range of 40mm-90mm; the bottom of the convex structure adopts a concave fillet transition structure, and the concave fillet radius is in a range of 40mm-90mm.

[0010] Compared with the prior art, the method for improving the quasi-beta forging deformation uniformity of the titanium alloy T-shaped section forging has the following advantages:

[0011] 1. The method provided by the application improves the structure of the conventional cuboid blank, and uses finite element simulation analysis, so that the overall deformation of the titanium alloy T-shaped section forging after quasi-beta forging is within the effective deformation range of 20%-40%, the deformation of the titanium alloy T-shaped section forging is improved, the quality of the product is improved, the yield is improved, and the scrap rate is reduced.

[0012] 2. In the application, the pit and convex structure are added to the conventional cuboid blank, wherein the pit structure is added to the bar forming area of the titanium alloy T-shaped section forging, and the convex structure is added to the opposite area of the bar forming of the forging. The pit structure can make the metal material flow into the bar forming die cavity in the form of "reverse deformation", thereby increasing the deformation of the bar forming area of the titanium alloy T-shaped section forging. The convex structure can increase the metal material of the opposite area of the bar forming of the forging, and increase the deformation of this area in the form of "reverse deformation". The improved blank can significantly increase the deformation of the bar forming area and the opposite area of the bar forming of the titanium alloy T-shaped section forging during quasi-beta forging, so that the deformation uniformity of the forging during quasi-beta forging is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure schematic diagram of the titanium alloy T-shaped section forging of the application;

[0014] Figure 2 It is a structure schematic diagram of the improved blank in the embodiment of the application;

[0015] Figure 3 It is a comparison diagram of equivalent strain distribution after quasi-beta forging finite element simulation of the conventional cuboid blank and the improved blank, wherein a is the equivalent strain distribution diagram after quasi-beta forging simulation of the conventional cuboid blank, and b is the equivalent strain distribution diagram after quasi-beta forging simulation of the improved blank in the embodiment;

[0016] In the diagram, A represents the first improved area, B represents the second improved area, r1 represents the radius of the concave arc, h1 represents the center distance of the concave arc, r2 represents the radius of the convex arc, h2 represents the center distance of the convex arc, r3 represents the radius of the concave fillet, and r4 represents the radius of the convex fillet. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] The present invention provides a method for improving the uniformity of quasi-β forging deformation in titanium alloy T-section forgings, comprising the following steps:

[0019] Step 1: Improve the structure of the quasi-β forging billet. Add a recessed structure to the first improved area A on the conventional cuboid slab and add a convex structure to the second improved area B. The first improved area A is the forging rib forming area, and the second improved area B is the opposite area for the forging rib forming.

[0020] Step 2: Numerical simulation of quasi-β forging of the improved billet is performed using simulation software, so that the overall deformation of the titanium alloy T-section forging obtained after quasi-β forging of the improved billet is within the effective deformation range of 20% to 40%.

[0021] Step 3: Perform quasi-β forging on the improved billet.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments presented herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] Example

[0024] like Figure 1 As shown, the T-section forging processed in this embodiment is a TC21 titanium alloy forging. The method for improving the uniformity of quasi-β forging deformation of the titanium alloy T-section forging includes the following steps:

[0025] Step 1: Improve the structure of the quasi-β forging billet by adding recessed and raised structures to the conventional cuboid slab. In this embodiment, the first improved area A of the TC21 titanium alloy T-section forging has a recessed structure, and the second improved area B has a raised structure. The schematic diagram of the improved billet is shown below. Figure 2 As shown.

[0026] Step 2: Numerical simulation of quasi-β forging is performed on the improved billet using simulation software, so that the overall deformation of the TC21 titanium alloy T-section forging obtained after quasi-β forging of the improved billet is within the effective deformation range of 20% to 40%.

[0027] In this embodiment, as Figure 2As shown, recessed and convex structures are added to a conventional rectangular slab of TC21 titanium alloy. Specifically, recessed structures are added in the first improved region A of the T-section forging, and convex structures are added in the second improved region B of the forging. The structural dimensional parameters of the recessed and convex structures on the TC21 titanium alloy billet include the radius r1 of the recessed arc, the center distance h1 of the recessed arc, the radius r2 of the convex arc, and the center distance h2 of the convex arc. The values ​​of the concave arc radius range from 90mm to 120mm, the values ​​of the concave arc center distance h1 range from 60mm to 90mm, the values ​​of the convex arc radius r2 range from 100mm to 130mm, and the values ​​of the convex arc center distance h2 range from 60mm to 90mm. The bottom of the concave structure adopts a convex rounded corner transition structure, wherein the convex rounded corner radius r4 ranges from 40mm to 90mm. The bottom of the convex hull structure adopts a concave rounded corner transition structure, wherein the concave rounded corner radius r3 ranges from 40mm to 90mm.

[0028] In this embodiment, the radius of the concave arc is 105mm, the center distance h1 of the concave arc is 80mm, the radius r2 of the convex arc is 115mm, the center distance h2 of the convex arc is 80mm, the radius r4 of the convex fillet is 60mm, and the radius r3 of the concave fillet is also 60mm.

[0029] like Figure 3 a and Figure 3 As shown in Figure b, a numerical simulation of quasi-β forging was performed on the improved billet. The equivalent variables of different parts of the forging after quasi-β forging were obtained from the simulation results. The equivalent variables and deformation can be converted using the relationship y = -ln(1 / x), where x is the deformation and y is the equivalent variable value. The simulation results are shown in Figure b. Figure 2 As shown, where Figure 3 'a' represents the simulation results of a conventional TC21 titanium alloy cuboid billet after quasi-β forging. Figure 3 b represents the simulation results of the improved TC21 titanium alloy billet after quasi-β forging in this embodiment.

[0030] from Figure 3 a and Figure 3It can be seen from b that the deformation of the first improved area A in the T-shaped cross-section forging is less than 18% and the equivalent strain is less than 0.2 after the conventional cuboid blank is subjected to quasi-beta forging; the large-area deformation of the second improved area B is between 0% and 26% and the large-area equivalent strain is between 0 and 0.3, which cannot meet the requirements. However, in the embodiment, the large-area deformation of the first improved area A in the T-shaped cross-section forging is between 18% and 33% and the equivalent strain is between 0.2 and 0.4; the large-area deformation of the second improved area B is between 18% and 45% and the large-area equivalent strain is between 0.2 and 0.6 after the blank with improved structure is subjected to quasi-beta forging. It can be seen that the method for improving the quasi-beta forging deformation uniformity of the titanium alloy T-shaped cross-section forging can significantly increase the deformation of the first improved area A and the second improved area B in the titanium alloy T-shaped cross-section forging after quasi-beta forging, so that the deformation uniformity of the forging after quasi-beta forging is effectively improved.

[0031] Step 3: machining the quasi-beta forging blank according to the optimized blank structure size data.

[0032] The above embodiments are only examples for clearly illustrating the present application, but not limitations on the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A method for improving the uniformity of quasi-β forging deformation in titanium alloy T-section forgings, characterized in that, Includes the following steps: Step 1: Improve the structure of the quasi-β forging billet by adding recessed and raised structures to the conventional cuboid slab. Step 2: Numerical simulation of quasi-β forging of the improved billet is performed using simulation software to ensure that the overall deformation of the titanium alloy T-section forgings obtained after quasi-β forging of the improved billet is within the effective deformation range of 20% to 40%. Step 3: Perform quasi-β forging on the improved billet; The structural dimensional parameters of the blank include the radius of the concave arc, the center distance of the concave arc, the radius of the convex arc, and the center distance of the convex arc; wherein, the radius of the concave arc ranges from 90mm to 120mm, the center distance of the concave arc ranges from 60mm to 90mm, the radius of the convex arc ranges from 100mm to 130mm, and the center distance of the convex arc ranges from 60mm to 90mm; the bottom of the concave structure adopts a convex rounded corner transition structure, wherein the radius of the convex rounded corner ranges from 40mm to 90mm; the bottom of the convex structure adopts a concave rounded corner transition structure, wherein the radius of the concave rounded corner ranges from 40mm to 90mm.

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