Manufacturing method of large S-shaped titanium alloy forge piece

Abstract

The invention discloses a manufacturing method of a large S-shaped titanium alloy forge piece, and belongs to the technical field of forging and pressing. The problems that in the prior art, large S-shaped titanium alloy forgings are low in production efficiency, poor in product quality and low in yield are solved. Comprising the following steps: S1, designing a blank flattening, bending correcting and bending tool; s2, a protrusion is arranged on the outer side wall of the first hot bending part of the rough blank in a surrounding mode; s3, the rough blank is preheated to complete first-time hot bending; s4, secondary simmering bending of the rough blank is completed; s5, the rough blank is placed in a flattening and bending-correcting groove to be flattened and bent; and S6, the forge piece body is manufactured. The manufacturing method of the large S-shaped titanium alloy forge piece is used for manufacturing the large S-shaped titanium alloy forge piece, the protrusions are arranged on the outer side wall of the simmering bending part with large simmering bending deformation of a rough blank in a surrounding mode, the situation that the simmering bending part is thinned, the diameter is decreased, and springback is generated is prevented, and the product quality is improved; and the simmering bending boss, the simmering bending groove and the flattening and bending correcting groove are used, so that the process operation is simple, the production continuity is ensured, and the production efficiency and the yield of products are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of forging, and in particular relates to a method for manufacturing a large S-shaped titanium alloy forging. Background Art

[0002] Titanium alloys have the advantages of light weight, good corrosion resistance and high specific strength. They 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 and concentrated joints of aircraft bodies. Titanium alloys can be divided into deformation titanium alloys, casting titanium alloys, and powder metallurgy titanium alloys according to the preparation process, among which forging is the most widely used forming method so far.

[0003] A large S-shaped titanium alloy forging has a total length of more than 1 meter. It is made of TA15 titanium alloy and is an important load-bearing component of the aircraft. The forging process of TA15 titanium alloy forging is α+β forging, and the heating temperature is T β -20~50℃, nominal T β =1000℃, the final forging temperature is generally required to be ≥850℃, the forging temperature range is narrow, the deformation resistance is large, and as the temperature decreases, the deformation resistance will increase sharply, which will increase the difficulty of deformation and increase the processing cost. At the same time, residual stress will be generated, affecting the performance and stability of the forgings, and the forging quality will be poor. The overall shape of the forging is S-shaped, and it is a large forging with a length of more than 1 meter. It is not suitable to use die forging. Generally, free forging is used for bending forging. However, due to its complex shape, narrow forging temperature range, and rebound after bending, there are many problems such as low production efficiency and low yield rate. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for manufacturing large S-shaped titanium alloy forgings, which has simple process operations and improves the production efficiency, production quality and yield rate of large S-shaped complex titanium alloy forgings.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention discloses a method for manufacturing a large S-shaped titanium alloy forging, comprising a large S-shaped forging body, wherein the forging body comprises a first forging bent portion and a second forging bent portion connected to each other, and the method for manufacturing the forging body comprises the following steps:

[0007] S1. Designing a flattening and bending groove and a first bending groove, a first bending boss, a second bending groove, and a second bending boss according to the forging body and the first forging bending portion and the second forging bending portion of the forging body;

[0008] S2. Designing a blank according to the forging body, wherein the centerline length of the blank is greater than the centerline length of the forging body, the blank comprises a first bent portion and a second bent portion connected to each other, and a protrusion is arranged around the outer side wall of the first bent portion of the blank;

[0009] S3, preheating the blank to above 750° C., placing the preheated first bending portion of the blank on the top of the first bending groove, with the first bending boss located above the first bending portion of the blank, with the active end of the first bending boss facing the first bending portion of the blank, applying pressure to the first bending boss to bend the first bending portion of the blank to form the first blank bent portion of the blank, and the blank completes the first bending;

[0010] S4, placing the first bent portion of the blank on the groove edge of the second bending groove, the second bent portion of the blank is located at the top of the second bending groove, the second bending boss is located above the second bent portion of the blank, the action end of the second bending boss is facing the second bent portion of the blank, the second bending boss is pressed to bend the second bent portion of the blank to form the second bent portion of the blank, and the blank completes the second bending;

[0011] S5, placing the blank that has completed the second bending in the flattening and bending groove for flattening and bending;

[0012] S6. The forging body is manufactured.

[0013] Furthermore, in step S2, the diameter of the blank is D, the height of the protrusion is H, the angle between the tangent of the first forging bend of the forging body at one end close to the second forging bend and the perpendicular at one end away from the second forging bend is A, and H=0.1*D*cosA.

[0014] Furthermore, the angle between the radial lines at both ends of the first forging bend of the forging body is B, the angle between the tangent lines at the groove edges at both ends of the first bending groove is C, and 1°≤CB≤3°.

[0015] Furthermore, the flattened bending correction groove comprises a first bending correction portion and a second bending correction portion connected to each other, and the inner groove wall of the flattened bending correction groove away from the second bending correction portion is inclined toward the outer groove wall away from the second bending correction portion, and the inclination angle is E, 4°≤E≤10°.

[0016] Furthermore, the radius of the first forging bend of the forging body is R1, the radius of the second forging bend of the forging body is R2, the radius of the first bend of the flattening bend groove is R3, and 40mm≤R1-R3≤80mm.

[0017] Furthermore, the radius of the first bending groove is R4, 0mm≤R1-R4≤20mm.

[0018] Furthermore, the radius of the second bending groove is R5, 0mm≤R2-R5≤20mm.

[0019] Furthermore, in step S2, the centerline length of the forging body is L1, the length of the blank is L2, and 20mm≤L2-L1≤50mm.

[0020] Furthermore, in step S5, the blank is hammered into the flattening and bending groove by hammering.

[0021] Furthermore, the first bending groove and the second bending groove are arranged in parallel on two workstations of a bending mold, and opposite notches are opened on two groove edges of the second bending groove, and the notches are chamfered.

[0022] The beneficial effects of the present invention are:

[0023] The manufacturing method of large S-shaped titanium alloy forgings provided by the present invention is used for manufacturing large S-shaped complex titanium alloy forgings, and the steps are as follows: S1 designing the first bending groove, the first bending boss, the second bending groove, the second bending boss and the flattening groove - S2 setting a protrusion around the outer wall of the first bending part of the rough billet - S3 preheating the rough billet to above 750° to complete the first bending - S4 completing the second bending of the rough billet - S5 placing the rough billet that has completed the second bending in the flattening groove for flattening - S6 completing the manufacturing of the forging body. The first bending part of the blank is placed on the top of the first bending groove, and the first bending boss is pressurized to cooperate with the first bending groove to complete the first bending of the blank. After the first bending of the blank is completed, it is immediately placed in the second bending groove. The second bending part of the blank is located at the top of the second bending groove, and the second bending boss is pressurized to cooperate with the second bending groove to complete the second bending of the blank. The blank that has completed the second bending is immediately placed in the flattening and bending groove. The first bending part of the blank corresponds to the first bending part of the flattening and bending groove, and the second bending part of the blank corresponds to the second bending part of the flattening and bending groove, so that the blank can complete the flattening and bending, reduce rebound and rework, and improve product quality. The process is simple to operate, which ensures the continuity of the production of large S-shaped titanium alloy forgings and improves large S-shaped titanium alloy. Production efficiency of forgings; a protrusion is arranged around the outer wall of the first bending part of the blank with a larger bending deformation arc, so as to avoid the rebound phenomenon of the first bending part after bending due to the thinning and reduction of the diameter of the first bending part after bending, thereby ensuring the mechanical properties and stability of large S-shaped titanium alloy forgings, improving the quality of products, ensuring the product yield, and increasing the service life of large S-shaped titanium alloy forgings; the blank can be bent after being preheated to above 750°C, reducing the temperature required for bending forging, increasing the bending temperature range, reducing the deformation resistance of the blank, reducing the difficulty of bending deformation of the blank, reducing the generation of residual stress, further ensuring the mechanical properties and stability of large S-shaped titanium alloy forgings, improving the quality of products, and increasing the service life, while reducing the bending forging conditions and equipment requirements, and reducing production costs. The manufacturing method of large S-shaped titanium alloy forgings of the present application is particularly suitable for the manufacturing of large S-shaped complex titanium alloy forgings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a process flow chart of a method for manufacturing a large S-shaped titanium alloy forging provided by an embodiment of the present invention;

[0026] Figure 2 is a front view of a large S-shaped titanium alloy forging body provided by an embodiment of the present invention;

[0027] Figure 3 is a front view of a blank provided by an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of a bending die provided by an embodiment of the present invention;

[0029] Figure 5 yes Figure 4 A front view of

[0030] Figure 6 yes Figure 4 A top view of

[0031] Figure 7 is a schematic structural diagram of a first bent boss provided in an embodiment of the present invention;

[0032] Figure 8 is a schematic structural diagram of a second bent boss provided in an embodiment of the present invention;

[0033] Fig. 9 This is a state diagram of the blank provided by the embodiment of the present invention when the blank begins to be bent for the first time;

[0034] Fig.10 This is a state diagram of the blank provided by the embodiment of the present invention when the blank has completed the first bending;

[0035] Fig.11 This is a state diagram of the blank provided by the embodiment of the present invention when the second bending begins;

[0036] Fig.12 is a state diagram of the blank provided by the embodiment of the present invention when the second bending is completed;

[0037] Fig.13 2 is a schematic diagram of the structure of a flattening and bending correction groove provided in an embodiment of the present invention;

[0038] Fig.14 yes Fig.13 Top view of the .

[0039] Figure numerals: forging body 1, first forging bend 101, second forging bend 102, blank 2, protrusion 3, bending die 4, first bending groove 5, second bending groove 6, notch 601, first bending boss 7, second bending boss 8, flattening correction groove 9, first correction bending portion 901. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 As shown, this embodiment provides a method for manufacturing a large S-shaped titanium alloy forging, including a large S-shaped forging body 1, wherein the forging body 1 includes a first forging bent portion 101 and a second forging bent portion 102 connected to each other, and the method for manufacturing the forging body 1 includes the following steps:

[0043] S1, designing a flattening and bending groove 9 and a first bending groove 5, a first bending boss 7, a second bending groove 6, and a second bending boss 8 according to the forging body 1 and the first forging bending portion 101 and the second forging bending portion 102 of the forging body 1;

[0044] S2. Designing a blank 2 according to the forging body 1, wherein the centerline length of the blank 2 is greater than the centerline length of the forging body 1, the blank 2 comprises a first bent portion and a second bent portion connected to each other, and a protrusion 3 is arranged around the outer side wall of the first bent portion of the blank 2;

[0045] S3, preheating the blank 2 to above 750°C, placing the preheated first bending portion of the blank 2 on the top of the first bending groove 5, the first bending boss 7 is located above the first bending portion of the blank 2, the action end of the first bending boss 7 is facing the first bending portion of the blank 2, the first bending boss 7 is pressed to bend the first bending portion of the blank 2 to form the first blank bending portion of the blank 2, and the blank 2 completes the first bending;

[0046] S4, placing the first bent portion of the blank 2 on the groove edge of the second bending groove 6, the second bent portion of the blank 2 is located at the top of the second bending groove 6, the second bending boss 8 is located above the second bent portion of the blank 2, the action end of the second bending boss 8 is facing the second bent portion of the blank 2, the second bending boss 8 is pressed to bend the second bent portion of the blank 2 to form the second bent portion of the blank 2, and the blank 2 completes the second bending;

[0047] S5, placing the blank 2 that has completed the second bending in the flattening and bending groove 9 for flattening and bending;

[0048] S6. The forging body 1 is manufactured.

[0049] Based on the above-mentioned manufacturing method of large S-shaped titanium alloy forgings, it is used for manufacturing large S-shaped complex titanium alloy forgings, and the steps are as follows: S1 designing the first bending groove 5, the first bending boss 7, the second bending groove 6, the second bending boss 8 and the leveling and calibration groove 9 - S2 setting the protrusion 3 around the outer wall of the first bending part of the blank 2 - S3 preheating the blank 2 to more than 750° to complete the first bending - S4 the blank 2 completes the second bending - S5 the blank 2 that has completed the second bending is placed in the leveling and calibration groove 9 for leveling and calibration - S6 the forging body 1 is manufactured. The first bending part of the blank 2 is placed on the top of the first bending groove 5, and the forging machine presses the first bending boss 7 to cooperate with the first bending groove 5 to enable the blank 2 to complete the first bending. After the blank 2 completes the first bending, it is immediately placed in the second bending groove 6. The second bending part of the blank 2 is located on the top of the second bending groove 6, and the forging machine presses the second bending boss 8 to cooperate with the second bending groove 6 to enable the blank 2 to complete the second bending. The blank 2 that has completed the second bending is immediately placed in the flattening and bending groove 9. The first blank bending part of the blank 2 corresponds to the first bending part 901 of the flattening and bending groove 9, and the second blank bending part of the blank 2 corresponds to the second bending part of the flattening and bending groove 9, so that the blank 2 can complete the flattening and bending, reduce rebound and rework, and improve product quality. The process is simple to operate, which ensures the continuous production of large S-shaped titanium alloy forgings. The invention can improve the production efficiency of large S-shaped titanium alloy forgings; a protrusion 3 is arranged around the outer wall of the first bending part of the blank 2 with a larger bending deformation arc to avoid the rebound phenomenon of the first bending part after bending due to the thinning and diameter reduction of the first bending part after bending, thereby ensuring the mechanical properties and stability of large S-shaped titanium alloy forgings, improving the quality of the product, ensuring the product yield, and increasing the service life of large S-shaped titanium alloy forgings; the blank 2 can be bent after being preheated to above 750°C, reducing the temperature required for bending forging, increasing the bending temperature range, reducing the deformation resistance of the blank 2, reducing the difficulty of bending deformation of the blank 2, reducing the generation of residual stress, further ensuring the mechanical properties and stability of large S-shaped titanium alloy forgings, improving the quality of the product, and increasing the service life. At the same time, it reduces the bending forging conditions and equipment requirements, and reduces production costs. The manufacturing method of large S-shaped titanium alloy forgings of the present application is particularly suitable for the manufacturing of large S-shaped complex titanium alloy forgings.

[0050] As an implementation method, Figure 2 , Figure 3 As shown, in step S2, the diameter of the blank 2 is D, the height of the protrusion 3 is H, the angle between the tangent line at one end of the first forging bend 101 of the forging body 1 close to the second forging bend 102 and the vertical line at one end of the first forging bend 101 away from the second forging bend 102 is A, and H=0.1*D*cosA.

[0051] Among them, 0.1 is the conventional coefficient that remains unchanged. The smaller the angle A is, the greater the bending arc of the first forging bend 101 of the forging body 1 is, and the greater the height H of the protrusion 3 is, 0°<A<90°. For example, if the diameter D of the blank 2 is 75mm and A is 60°, the height H of the protrusion 3 is 0.1*75*cos60°=0.1*75*0.5=3.75mm.

[0052] As an implementation method, Figure 2 , Figure 4 , Figure 5 As shown, the angle between the radial lines at both ends of the first forging bend 101 of the forging body 1 is B, and the angle between the tangent lines at the groove edges at both ends of the first bending groove 5 is C, 1°≤CB≤3°.

[0053] Angle C of the first bending groove 5 is slightly larger than angle B of the forging body 1, and a bending arc is reserved to facilitate the later placement of the leveling and bending groove 9. For example, angle C is 1° to 3° larger than angle B, such as 1° or 2° or 3°, which is specifically designed according to angle B.

[0054] As an implementation method, Fig.13 , Fig.14 As shown, the flattened bending correction groove 9 includes a first bending correction portion 901 and a second bending correction portion connected to each other. The inner groove wall of the flattened bending correction groove 9 away from the second bending correction portion is inclined toward the outer groove wall away from the second bending correction portion, and the inclination angle is E, 4°≤E≤10°.

[0055] If the inclination angle E is 4°, 5°, 8° or 10°, the size of the first blank bend portion of the blank 2 accommodated in the flattening and bending groove 9 will be slightly larger than the size of the first blank bend portion, making it easier to place the blank into the flattening and bending groove 9.

[0056] As an implementation method, Figure 2 , Fig.13 , Fig.14 As shown, the radius of the first forging bend 101 of the forging body 1 is R1, the radius of the second forging bend 102 of the forging body 1 is R2, the radius of the first bend 901 of the flattening bend groove 9 is R3, and 40mm≤R1-R3≤80mm.

[0057] The radius R3 of the first bending portion 901 of the flattening and bending groove 9 is slightly larger than the radius R1 of the first forging bending portion 101 of the forging body 1. For example, R3 is 40mm to 80mm larger than R1, specifically 40mm, 60mm or 80mm, which makes it easier to place the blank into the flattening and bending groove 9.

[0058] As an implementation method, Fig. 9As shown, the radius of the first bending groove 5 is R4, 0mm≤R1-R4≤20mm.

[0059] The radius R4 of the first bending groove 5 is equal to or slightly smaller than the radius R1 of the first forging bent portion 101, and is reserved for bending processing, such as R4=R1, R4 is 1mm, 5mm, 10mm or 20mm smaller than R1.

[0060] As an implementation method, Fig.10 As shown, the radius of the second bending groove 6 is R5, 0mm≤R2-R5≤20mm.

[0061] The radius R5 of the second bending groove 6 is equal to or slightly smaller than the radius R2 of the second forging bent portion 102, and is reserved for bending processing, such as R5=R2, R5 is smaller than R2 by 1mm, 5mm, 10mm, 15mm or 20mm.

[0062] As an implementation method, Figure 2 , Figure 3 As shown, in step S2, the centerline length of the forging body 1 is L1, the length of the blank 2 is L2, and 20mm≤L2-L1≤50mm.

[0063] The centerline length L2 of the blank 2 is greater than the centerline length L1 of the forging body 1, and is reserved for bending processing. L2 is 20mm, 30mm, 40mm or 50mm larger than L1.

[0064] As an implementable embodiment, in step S5, the blank 2 is hammered into the flattening and bending groove 9 by hammering.

[0065] The hammering method is convenient for hammering the blank 2 that has completed the second bending into the flattening and bending groove 9. A hammer can be lightly applied to the first blank bending portion of the blank 2 to automatically rotate the blank 2 for bending correction.

[0066] As an implementation method, Figure 4 , Figure 5 , Figure 6 As shown, the first bending groove 5 and the second bending groove 6 are arranged in parallel on two stations of a bending mold 4, and opposite notches 601 are opened on the two groove edges of the second bending groove 6, and the notches 601 are chamfered.

[0067] The first bending groove 5 and the second bending groove 6 are arranged in parallel on two workstations of a bending mold 4. After the blank 1 completes the first bending, it can be quickly placed in the second bending groove 6 next to it for the second bending, thereby improving production efficiency. The notch 601 is provided with a smooth chamfer to reduce damage to the first bending portion of the blank 2. The chamfer of the notch 601 fits with the first bending portion of the blank 2, thereby facilitating the second bending boss 8 to pressurize and bend the second bending portion of the blank 2.

[0068] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for manufacturing a large S-shaped titanium alloy forging, comprising a large S-shaped forging body (1), wherein the forging body (1) comprises a first forging bent portion (101) and a second forging bent portion (102) connected to each other, characterized in that: The manufacturing method of the forging body (1) comprises the following steps: S1, designing a flattening and bending groove (9) and a first bending groove (5), a first bending boss (7), a second bending groove (6), and a second bending boss (8) according to the forging body (1) and the first forging bent portion (101) and the second forging bent portion (102) of the forging body (1); S2. Designing a blank (2) according to the forging body (1), wherein the centerline length of the blank (2) is greater than the centerline length of the forging body (1), the blank (2) comprises a first bent portion and a second bent portion connected to each other, and a protrusion (3) is arranged around the outer side wall of the first bent portion of the blank (2); S3, preheating the blank (2) to above 750°C, placing the first bending portion of the preheated blank (2) on the top of the first bending groove (5), the first bending boss (7) being located above the first bending portion of the blank (2), the action end of the first bending boss (7) facing the first bending portion of the blank (2), applying pressure to the first bending boss (7) so that the first bending portion of the blank (2) is bent to form the first blank bending portion of the blank (2), and the blank (2) completes the first bending; S4, placing the first bending portion of the blank (2) on the groove edge of the second bending groove (6), the second bending portion of the blank (2) is located at the top of the second bending groove (6), the second bending boss (8) is located above the second bending portion of the blank (2), the action end of the second bending boss (8) is facing the second bending portion of the blank (2), the second bending boss (8) is pressurized to bend the second bending portion of the blank (2) to form the second bending portion of the blank (2), and the blank (2) completes the second bending; S5, placing the blank (2) that has completed the second bending in the flattening and bending groove (9) for flattening and bending; S6. The forging body (1) is manufactured.

2. The method for manufacturing a large S-shaped titanium alloy forging according to claim 1, characterized in that: In step S2, the diameter of the blank (2) is D, the height of the protrusion (3) is H, the angle between the tangent line at one end of the first forging bend (101) of the forging body (1) close to the second forging bend (102) and the perpendicular line at one end of the first forging bend (101) away from the second forging bend (102) is A, and H=0.1*D*cosA.

3. The method for manufacturing a large S-shaped titanium alloy forging according to claim 1, characterized in that: The angle between the radial lines at both ends of the first forged bend (101) of the forged body (1) is B, and the angle between the tangent lines at both ends of the first bending groove (5) is C, 1°≤CB≤3°.

4. The method for manufacturing a large S-shaped titanium alloy forging according to claim 1, characterized in that: The flattened bending correction groove (9) comprises a first bending correction portion (901) and a second bending correction portion which are connected to each other. The inner groove wall of the flattened bending correction groove (9) away from the second bending correction portion is inclined toward the outer groove wall away from the second bending correction portion, and the inclination angle is E, 4°≤E≤10°.

5. The method for manufacturing a large S-shaped titanium alloy forging according to claim 4, characterized in that: The radius of the first forging bend (101) of the forging body (1) is R1, the radius of the second forging bend (102) of the forging body (1) is R2, the radius of the first bend (901) of the flattening bend groove (9) is R3, and 40mm≤R1-R3≤80mm.

6. The method for manufacturing a large S-shaped titanium alloy forging according to claim 5, characterized in that: The radius of the first bending groove (5) is R4, 0mm≤R1-R4≤20mm.

7. The method for manufacturing a large S-shaped titanium alloy forging according to claim 5, characterized in that: The radius of the second bending groove (6) is R5, 0mm≤R2-R5≤20mm.

8. The method for manufacturing a large S-shaped titanium alloy forging according to claim 1, characterized in that: In step S2, the centerline length of the forging body (1) is L1, the length of the blank (2) is L2, and 20mm≤L2-L1≤50mm.

9. The method for manufacturing a large S-shaped titanium alloy forging according to claim 1, characterized in that: In step S5, the blank (2) is hammered into the flattening and bending groove (9).

10. The method for manufacturing a large S-shaped titanium alloy forging according to claim 1, characterized in that: The first bending groove (5) and the second bending groove (6) are arranged in parallel on two workstations of a bending mold (4); two groove edges of the second bending groove (6) are provided with opposite notches (601); and the notches (601) are chamfered.

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