GH4169 alloy special-shaped ring forging method

Abstract

The invention provides a GH4169 alloy special-shaped ring forging method, and relates to the field of aircraft part forging, the method comprises the following steps: obtaining a GH4169 alloy annular intermediate billet; the height-to-thickness ratio of the GH4169 alloy annular intermediate billet is any one of the following preset height-to-thickness ratios: 4.4, 4.3 and 3.9; the GH4169 alloy intermediate billet is subjected to tire mold bulging, and a GH4169 alloy special-shaped ring forged piece is obtained; the inner diameter of the top of the GH4169 alloy special-shaped ring forge piece is larger than that of the waist part; and the inner diameter of the waist part of the GH4169 alloy special-shaped ring forge piece is greater than that of the bottom part. The method is suitable for the forging process of the GH4169 alloy special-shaped ring and is used for providing a reasonable forging process of the GH4169 alloy special-shaped ring.

Description

Technical Field

[0001] The present application relates to the field of forging, specifically to the field of aircraft parts forging, and in particular to a method for forging a GH4169 alloy special-shaped ring. Background Art

[0002] GH4169 alloy is a Fe-Ni-Co based deformable high temperature alloy. It has good strength and plasticity, corrosion resistance and oxidation resistance, good fatigue performance and fracture toughness below 650℃. It is currently the most widely used high temperature alloy in the aerospace field. However, GH4169 alloy has high deformation resistance, poor material fluidity, narrow forging temperature range and great forming difficulty.

[0003] Taking a certain type of GH4169 alloy special-shaped ring as an example, the radial size change rate of the GH4169 alloy special-shaped ring is large and the forming control is difficult. Therefore, how to design a reasonable forging process has become our need. Summary of the invention

[0004] The present application provides a GH4169 alloy special-shaped ring forging method, which is used to provide a reasonable GH4169 alloy special-shaped ring forging process.

[0005] In a first aspect, the present application provides a GH4169 alloy special-shaped ring forging method, the method comprising: Obtaining a GH4169 alloy annular intermediate billet; the height-to-thickness ratio of the GH4169 alloy annular intermediate billet is any one of the following preset height-to-thickness ratios: 4.4, 4.3, and 3.9; The GH4169 alloy intermediate billet is subjected to membrane bulging to obtain a GH4169 alloy special-shaped ring forging; the top inner diameter of the GH4169 alloy special-shaped ring forging is larger than the waist inner diameter; the waist inner diameter of the GH4169 alloy special-shaped ring forging is larger than the bottom inner diameter.

[0006] Optionally, the wall thickness of the GH4169 alloy special-shaped ring forging is 3.8 mm.

[0007] Optionally, the top inner diameter of the GH4169 alloy special-shaped ring forging is 742 mm, and the bottom inner diameter is 587.6 mm.

[0008] Optionally, obtaining a GH4169 alloy ring-shaped intermediate billet includes: Get GH4169 alloy bar stock; The GH4169 alloy bar is subjected to upsetting punching, bar expansion, and ring rolling to obtain a GH4169 alloy ring-shaped intermediate billet.

[0009] Optionally, before the GH4169 alloy intermediate billet is subjected to membrane bulging, the method further comprises: The GH4169 alloy intermediate billet was pre-bulged.

[0010] Optionally, the method further comprises: A plurality of candidate intermediate billet design schemes are obtained; the intermediate billet height-to-thickness ratios in different candidate intermediate billet design schemes are different; The process of bulging the intermediate billet membrane into GH4169 alloy special-shaped ring forgings in each candidate intermediate billet design scheme was numerically simulated, and the axial filling situation between the lower die and the punch of each candidate intermediate billet design scheme was analyzed.

[0011] Optionally, the plurality of candidate intermediate billet designs include: Outer diameter 640mm, inner diameter 530mm, height 240mm, wall thickness 55mm, height-to-thickness ratio 4.4; Outer diameter 640mm, inner diameter 525mm, height 250mm, wall thickness 57.5mm, height-to-thickness ratio 4.3; Outer diameter 640mm, inner diameter 540mm, height 260mm, wall thickness 50mm, height-to-thickness ratio 5.2; Outer diameter 640mm, inner diameter 522mm, height 230mm, wall thickness 59mm, height-to-thickness ratio 3.9.

[0012] Optionally, the method further comprises: heat treating the GH4169 alloy special-shaped ring forging.

[0013] Optionally, the method further comprises: performing rough machining on the GH4169 alloy special-shaped ring forging according to a preset rough machining allowance.

[0014] It should be understood that through numerical simulation, it can be seen that for GH4169 alloy shaped ring forgings with large radial dimensional change rate and part material GH4169 difficult-to-deform high-temperature alloy, as the height-to-thickness ratio of the intermediate blank increases, the filling of the forging becomes worse and worse. Through numerical simulation, it can be obtained that when the height-to-thickness ratio of the intermediate blank is 4.4, 4.3, or 3.9, the axial filling between the lower die and the punch is better.

[0015] The GH4169 alloy special-shaped ring forging method provided in the present application can set the height-to-thickness ratio of the GH4169 alloy ring-shaped intermediate billet to any one of 4.4, 4.3, and 3.9. When such an intermediate billet is expanded by the tire mold, the axial filling condition between the lower die and the punch is better, which is convenient for forming control. Through such a forging process, a GH4169 alloy special-shaped ring that meets the requirements can be forged.

[0016] In a second aspect, the present application provides a GH4169 alloy special-shaped ring forging, which is forged by the GH4169 alloy special-shaped ring forging method described in the first aspect above.

[0017] The beneficial effects of the second aspect above can be referred to those described in the first aspect above and will not be elaborated on again. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a diagram of the outer dimensions of the GH4169 alloy special-shaped ring provided in the embodiment of the present application; Figure 2 A schematic diagram of the filling results of the finite element analysis of intermediate billets of different sizes provided in the embodiments of the present application; Figure 3 A physical picture of a GH4169 alloy shaped ring forging provided in an embodiment of the present application; Figure 4 A physical picture of a GH4169 alloy shaped ring forging after rough machining provided in an embodiment of the present application; Figure 5 A schematic diagram of the process of forging a GH4169 alloy special-shaped ring provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] It should be noted that, in the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplarily" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific way.

[0022] In order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second", etc. are not limiting the quantity and execution order.

[0023] GH4169 alloy is a Fe-Ni-Co based deformable high temperature alloy. It has good strength and plasticity, corrosion resistance and oxidation resistance, good fatigue performance and fracture toughness below 650℃. It is currently the most widely used high temperature alloy in the aerospace field. However, GH4169 alloy has high deformation resistance, poor material fluidity, narrow forging temperature range and great forming difficulty.

[0024] Taking a certain type of GH4169 alloy special-shaped ring as an example, the radial size change rate of the GH4169 alloy special-shaped ring is large and the forming control is difficult. Therefore, how to design a reasonable forging process has become our need.

[0025] The following is an introduction with reference to the accompanying drawings.

[0026] Figure 1 This is the outer dimension diagram of the GH4169 alloy special-shaped ring provided in the embodiment of the present application. Figure 1 As shown, this part is a medium to large annular part. Figure 1 FIG. 1 shows a half cross section of the GH4169 alloy shaped ring. From this half cross section, it can be seen that the bottom inner diameter of the GH4169 alloy shaped ring is 587.6 mm (mm). Figure 1 China-Israel Ф 587.6 is shown as an example), the bottom outer diameter is 595.2mm ( Figure 1 China-Israel Ф 595.2 is shown as an example), the top inner diameter is 742mm ( Figure 1 China-Israel Ф 742 is shown as an example). The wall plate of the GH4169 alloy shaped ring has the same thickness from top to bottom, which is 3.8mm. The top of the GH4169 alloy shaped ring also extends a horizontal ring outside the wall plate, and the outer diameter of the ring is 786mm ( Figure 1 China-Israel Ф 786 is shown as an example). The height of the GH4169 alloy shaped ring is 127.4 mm. The angle between the first wall plate between the bottom outer diameter and the waist outer diameter and the second wall plate between the waist outer diameter and the top ring inner diameter is an obtuse angle.

[0027] By the above Figure 1 It can be seen that the top inner diameter of the GH4169 alloy special-shaped ring forging is larger than the waist inner diameter ( Figure 1 The specific dimensions are not marked in the figure). The waist inner diameter of the GH4169 alloy special-shaped ring forging is larger than the bottom inner diameter. The overall radial dimension change rate of the part is large, and the wall thickness is thin, only 3.8mm. In addition, the part material is GH4169 difficult-to-deform high-temperature alloy, the forming quality requirements are high, and the forming control is difficult. Therefore, it is necessary to design reasonable forgings and forming processes to produce qualified products.

[0028] First, finite element analysis can be performed.

[0029] Using CAE to optimize product and process design is the general trend in the manufacturing industry. CAE-assisted design can shorten product development cycle, reduce production costs, improve product quality, etc. The development process of this product also uses CAE software Deform for finite element analysis to optimize the process and blank design.

[0030] After a comparative analysis of the processability of the product, it was determined that the membrane bulging process was used for forming. The design of the intermediate billet is one of the decisive factors to ensure the final forming quality of the forging. Based on the principle of constant volume and deformation control, the theoretically calculated intermediate billet has a certain rationality in actual production, but the quality problems that occur during the forming process cannot be predicted. For this reason, the finite element software was used to numerically simulate the forming process of the forging during the development process. By designing different intermediate billet sizes for comparative analysis, the intermediate billet optimization work was carried out to make the forming process more visible and reliable.

[0031] Exemplarily, the embodiment of the present application adopts a theoretical method combined with the mold size to determine the size range of the intermediate blank, designs 4 groups of schemes with different height-to-thickness ratios for numerical simulation, and the specific intermediate blank design scheme can be specifically shown in Table 1 below.

[0032] Table 1 As shown in Table 1, the intermediate blank design scheme provided in the embodiment of the present application may include: Plan 1: outer diameter 640mm, inner diameter 530mm, height 240mm, wall thickness 55mm, height-to-thickness ratio 4.4.

[0033] Option 2: outer diameter 640mm, inner diameter 525mm, height 250mm, wall thickness 57.5mm, height-to-thickness ratio 4.3.

[0034] Plan 3: outer diameter 640mm, inner diameter 540mm, height 260mm, wall thickness 50mm, height-to-thickness ratio 5.2.

[0035] Plan 4: outer diameter 640mm, inner diameter 522mm, height 230mm, wall thickness 59mm, height-to-thickness ratio 3.9.

[0036] For example, Figure 2 A schematic diagram of the filling results of the finite element analysis of intermediate billets of different sizes provided in the embodiments of the present application.

[0037] like Figure 2As shown in (a), it is the axial filling situation between the lower die and the punch during the forming process of the intermediate blank of Scheme 1. Scheme 1 has some insufficient filling during the forming process (shown by the circled part as an example).

[0038] like Figure 2 As shown in (b), it is the axial filling situation between the lower die and the punch during the forming process of the intermediate blank of Scheme 2. Scheme 2 has less insufficient filling during the forming process (shown as an example of the circled part).

[0039] like Figure 2 As shown in (c), it is the axial filling situation between the lower die and the punch during the forming process of the intermediate billet of Scheme 3. In the forming process of Scheme 3, there are more and larger areas of insufficient filling (shown as an example of the circled part).

[0040] like Figure 2 As shown in (d), it is the axial filling situation between the lower die and the punch during the forming process of the intermediate blank of Scheme 4. Scheme 4 has the least underfilling during the forming process (shown as an example of the circled part).

[0041] from Figure 2 It can be seen that with the increase of the height-to-thickness ratio of the intermediate billet, the filling condition of the forging becomes worse and worse. After the forming of scheme three with the largest height-to-thickness ratio is completed, the axial filling condition between the billet and the lower die and the punch is poor. The analysis results show that billets with a large height-to-thickness ratio are not suitable for production.

[0042] Then the forging production trial is carried out.

[0043] Combining production practice with the results of finite element optimization analysis, the forming process of the forging was determined to be tire membrane bulging and adding a pre-bulging process. The specific process flow is: blanking, upsetting punching, horse bar hole expansion, pre-rolling, pre-bulging, final forming (tire mold bulging), heat treatment, physical and chemical inspection, machining (rough processing), and warehousing.

[0044] For example, Figure 3 This is a physical picture of the GH4169 alloy special-shaped ring forging provided in the embodiment of this application. Figure 3 , Figure 3 The actual image of GH4169 alloy special-shaped ring forging is shown in FIG.

[0045] For example, Figure 4 This is a real picture of the rough-machined GH4169 alloy special-shaped ring forging provided in the embodiment of the present application. Figure 4 After the physical and chemical results of the GH4169 alloy special-shaped ring forgings were qualified, the forgings were rough-machined. Figure 4The actual image of the GH4169 alloy special-shaped ring forging after rough machining is shown in the figure. The trial production results show that the forging has no macro or micro defects, the physical and chemical test results meet the requirements of relevant standards, the forming quality is good, and the forging can be delivered to the warehouse.

[0046] Based on the understanding of the above embodiments, an embodiment of the present application provides a method for forging a GH4169 alloy special-shaped ring. Figure 5 The schematic diagram of the process of forging a GH4169 alloy shaped ring provided in the embodiment of the present application. Figure 5 As shown, the method includes the following steps: S101. Obtain a GH4169 alloy ring-shaped intermediate billet.

[0047] The height-to-thickness ratio of the GH4169 alloy annular intermediate billet is any one of the following preset height-to-thickness ratios: 4.4, 4.3, and 3.9.

[0048] In some possible embodiments, as described in the forging production trial, the process of obtaining the intermediate billet may specifically include the following steps: Step 1a: Obtain GH4169 alloy bar.

[0049] Step 2a, performing upsetting punching, bar expansion, and ring rolling on the GH4169 alloy bar to obtain a GH4169 alloy ring-shaped intermediate billet.

[0050] S102, performing membrane bulging on the GH4169 alloy intermediate billet to obtain a GH4169 alloy special-shaped ring forging.

[0051] Among them, the top inner diameter of the GH4169 alloy special-shaped ring forging is larger than the waist inner diameter, and the waist inner diameter of the GH4169 alloy special-shaped ring forging is larger than the bottom inner diameter.

[0052] Optionally, as above Figure 1 As shown in FIG. 1 , the wall thickness of the GH4169 alloy special-shaped ring forging may be specifically 3.8 mm.

[0053] Optionally, as above Figure 1 As shown in FIG. 1 , the top inner diameter of the GH4169 alloy shaped ring forging may be specifically 742 mm, and the bottom inner diameter may be specifically 587.6 mm.

[0054] In some possible embodiments, as described in the forging production trial section above, the intermediate blank may be pre-bulged before the tire mold is bulged.

[0055] In some possible embodiments, as described in the forging production trial section above, after final forming, the GH4169 alloy special-shaped ring forging may be heat treated.

[0056] In some possible embodiments, as described in the forging production trial section above, after the heat treatment, the GH4169 alloy special-shaped ring forging may be rough-machined according to a preset rough-machining allowance.

[0057] In some possible embodiments, as described in the finite element analysis above, before the above S101, the method may further include the following steps: Step 1b: obtaining multiple candidate intermediate billet design solutions.

[0058] Among them, the height-to-thickness ratio of the intermediate billet in different candidate intermediate billet design schemes is different.

[0059] For example, as shown in Table 1 above, the multiple candidate intermediate billet design solutions may specifically include the following solutions: Plan 1: outer diameter 640mm, inner diameter 530mm, height 240mm, wall thickness 55mm, height-to-thickness ratio 4.4.

[0060] Option 2: outer diameter 640mm, inner diameter 525mm, height 250mm, wall thickness 57.5mm, height-to-thickness ratio 4.3.

[0061] Plan 3: outer diameter 640mm, inner diameter 540mm, height 260mm, wall thickness 50mm, height-to-thickness ratio 5.2.

[0062] Plan 4: outer diameter 640mm, inner diameter 522mm, height 230mm, wall thickness 59mm, height-to-thickness ratio 3.9.

[0063] Step 2b, numerically simulate the process of bulging the intermediate billet membrane into a GH4169 alloy special-shaped ring forging in each candidate intermediate billet design scheme, and analyze the axial filling condition between the lower die and the punch of each candidate intermediate billet design scheme.

[0064] For example, as mentioned above Figure 2 As shown in the figure, after numerical simulation, as the height-to-thickness ratio of the intermediate billet increases, the filling of the forging becomes worse and worse. After the intermediate billet with a height-to-thickness ratio of 5.2 is bulged, there are more and larger areas of insufficient filling. The axial filling between the lower die and the punch of the other schemes with a height-to-thickness ratio of 4.4, 4.3, and 3.9, respectively, is better, and can be used as the preset height-to-thickness ratio for intermediate billet making.

[0065] It should be understood that through the above numerical simulation, it can be seen that for Figure 1The GH4169 alloy special-shaped ring forging shown in the figure has a large radial dimension change rate and the part material is GH4169 difficult-to-deform high-temperature alloy. As the height-to-thickness ratio of the intermediate blank increases, the filling of the forging becomes worse and worse. Through numerical simulation, it can be found that when the height-to-thickness ratio of the intermediate blank is 4.4, 4.3, or 3.9, the axial filling between the lower die and the punch is better.

[0066] The GH4169 alloy special-shaped ring forging method provided in the embodiment of the present application can set the height-to-thickness ratio of the GH4169 alloy annular intermediate billet to any one of 4.4, 4.3, and 3.9. When such an intermediate billet is expanded by the tire mold, the axial filling condition between the lower die and the punch is better, which is convenient for controlling the forming control. Through such a forging process, a GH4169 alloy special-shaped ring that meets the requirements can be forged.

[0067] The above is an introduction to the technical solution provided by the embodiment of the present application from the perspective of the method. In an exemplary embodiment, the embodiment of the present application also provides a GH4169 alloy shaped ring forging, which is forged by the GH4169 alloy shaped ring forging method provided in the above method embodiment.

[0068] Based on the understanding of the above embodiments, the following conclusions can be drawn: 1) For high-temperature alloy large-angle special-shaped rings, near-net forming is used to obtain streamlined and well-organized forgings, which greatly improves material utilization and reduces production costs; 2) The use of fetal membrane to form single-piece, small-batch, large-scale special-shaped rings can not only ensure product quality but also save production costs, and can fully tap the production capacity of existing equipment to create greater economic and social benefits.

[0069] 3) The GH4169 alloy special-shaped ring is a large special-shaped ring with a large expansion angle, which has opened up a new production model for large special-shaped rings and has important guiding value for the forming of similar products.

[0070] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations 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 equivalents, the present application is also intended to include these modifications and variations.

[0071] The above is only a specific implementation 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 included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for forging a GH4169 alloy special-shaped ring, characterized in that: The method comprises: Obtaining a GH4169 alloy annular intermediate billet; wherein the height-to-thickness ratio of the GH4169 alloy annular intermediate billet is any one of the following preset height-to-thickness ratios: 4.4, 4.3, and 3.9; The GH4169 alloy intermediate billet is subjected to membrane bulging to obtain a GH4169 alloy shaped ring forging; the top inner diameter of the GH4169 alloy shaped ring forging is larger than the waist inner diameter; the waist inner diameter of the GH4169 alloy shaped ring forging is larger than the bottom inner diameter.

2. The method according to claim 1, characterized in that The wall thickness of the GH4169 alloy special-shaped ring forging is 3.8 mm.

3. The method according to claim 1, characterized in that The top inner diameter of the GH4169 alloy special-shaped ring forging is 742 mm, and the bottom inner diameter is 587.6 mm.

4. The method according to claim 1, characterized in that The method of obtaining the GH4169 alloy ring-shaped intermediate billet comprises: Get GH4169 alloy bar stock; The GH4169 alloy bar is subjected to upsetting punching, bar expansion, and ring rolling to obtain the GH4169 alloy ring-shaped intermediate billet.

5. The method according to claim 1, characterized in that Before the GH4169 alloy intermediate billet is subjected to membrane bulging, the method further comprises: The GH4169 alloy intermediate billet is pre-bulged.

6. The method according to claim 1, characterized in that The method further comprises: A plurality of candidate intermediate billet design schemes are obtained; the intermediate billet height-to-thickness ratios in different candidate intermediate billet design schemes are different; The process of bulging the intermediate billet membrane into the GH4169 alloy special-shaped ring forging in each candidate intermediate billet design scheme is numerically simulated, and the axial filling situation between the lower die and the punch of each candidate intermediate billet design scheme is analyzed.

7. The method according to claim 6, characterized in that The multiple candidate intermediate billet design solutions include: Outer diameter 640mm, inner diameter 530mm, height 240mm, wall thickness 55mm, height-to-thickness ratio 4.4; Outer diameter 640mm, inner diameter 525mm, height 250mm, wall thickness 57.5mm, height-to-thickness ratio 4.3; Outer diameter 640mm, inner diameter 540mm, height 260mm, wall thickness 50mm, height-to-thickness ratio 5.2; Outer diameter 640mm, inner diameter 522mm, height 230mm, wall thickness 59mm, height-to-thickness ratio 3.

9.

8. The method according to claim 1, characterized in that The method further comprises: The GH4169 alloy special-shaped ring forging is heat treated.

9. The method according to claim 8, characterized in that The method further comprises: The GH4169 alloy special-shaped ring forging is rough-machined according to a preset rough-machining allowance.

10. A GH4169 alloy special-shaped ring forging, characterized in that: The GH4169 alloy special-shaped ring forging is forged by the forging method described in any one of claims 1 to 9.

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