Forging forming method of fan blade disc

Abstract

The invention relates to a forging forming method of a fan blade disc, which belongs to the technical field of forging and comprises the following steps: designing an annular forge piece according to a fan blade disc part; a forging die is designed according to the annular forge piece, the forging die is provided with an outer ring and an inner ring, a cavity of the forging die is formed between the outer ring and the inner ring, the outer ring is provided with a test ring forming gap, the side wall of the test ring forming gap is arranged to be a first straight wall, and a material avoiding gap is formed in the middle of the inner ring. The material avoiding gap is used for forming an inner circle flash on the inner ring wall of the annular forge piece in the forging process, and then a forming die is produced according to a designed forging die; designing and manufacturing an annular blank according to the material and machining allowance of the annular forging of the fan blade disc; and the annular blank is placed in a cavity of a forming die to be forged, and the annular forged piece is obtained. When the annular forge piece of the fan blade disc is forged through the method, the material consumption of the forge piece can be reduced, and cost is saved for enterprises.

Description

Technical Field

[0001] The invention belongs to the technical field of forging, and in particular relates to a forging method for a fan blade disk. Background Art

[0002] The fan blade is the core rotating component of aircraft engines, steam turbines and gas turbines. Structurally, the fan blade is an annular structure with a large-diameter inner hole. Industrially, forging is a forming method for fan blades, which is mainly performed by die forging.

[0003] In the prior art, a round cake-shaped blank is usually used for forging, and the forging obtained after forging is as follows: Figure 2 As shown, a thick skin 1 is formed in the inner hole, and a circle of outer circumferential flash 2 is also formed on the outer circumferential side wall of the forging. During subsequent processing, the skin 1 and outer circumferential flash 2 are removed to form a qualified fan blade forging. Removing the skin 1 and outer circumferential flash 2 will greatly waste the forging material. Summary of the Invention

[0004] The present invention provides a forging method for a fan blade disk, which is used to solve the technical problem that fan blade disk forgings forged by the existing method have skin connection and outer circular flash, resulting in a large waste of forging materials.

[0005] The present invention is achieved through the following technical solution: A forging method for a fan blade disk, comprising:

[0006] Step 1: Design an annular forging according to the fan blade disk part, wherein the outer ring wall of the annular forging is set as a second straight wall, and the inner ring wall of the annular forging is set with upper and lower draft angles;

[0007] Step 2: Designing a forging die according to the annular forging, wherein the forging die comprises an outer ring and an inner ring, wherein the outer ring and the inner ring form a cavity of the forging die, wherein the outer ring is provided with a trial ring forming gap, wherein the side wall of the trial ring forming gap is provided as a first straight wall, and a material clearance is provided in the middle of the inner ring, wherein the material clearance gap is used to form an inner circular burr on the inner ring wall of the annular forging during the forging process, and then producing a forming die according to the designed forging die;

[0008] Step 3: Designing and manufacturing an annular blank according to the material and machining allowance of the fan blade annular forging;

[0009] Step 4: placing the annular blank in the cavity of the forming die for forging to obtain the annular forging.

[0010] Further, in order to better realize the present application, the cross-sectional thickness of the outer ring and the inner ring of the forging die designed in step 2 is greater than or equal to 30 mm.

[0011] Further, in order to better realize the present application, the height of the material allowance gap of the forging die designed in step 2 is greater than or equal to 25 mm.

[0012] Further, in order to better realize the present application, the forging die designed in step 2 further has a receiving groove located at the inner side of the inner ring, the receiving groove is communicated with the cavity through the material allowance gap, and a lifting steel plate is placed in the receiving groove, the forging die further has a straight sliding hole, a lifting rod is slidingly installed in the straight sliding hole, the lifting rod is connected with the lifting steel plate, and the lifting steel plate and the lifting rod are used to lift the formed annular forging after the forging is completed.

[0013] Further, in order to better realize the present application, the lifting steel plate and the lifting rod are fixedly connected through bolts.

[0014] Further, in order to better realize the present application, the thickness of the lifting steel plate is greater than or equal to 20 mm, the thickness of the lifting steel plate is less than or equal to the depth of the receiving groove, and the gap between the outer side wall of the lifting steel plate and the side groove wall of the receiving groove is at least 1 mm.

[0015] Further, in order to better realize the present application, the diameter of the lifting rod is greater than or equal to 60 mm and less than or equal to 100 mm.

[0016] Further, in order to better realize the present application, the forging pressing speed in step 4 is 8 mm / s.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The fan blade ring forging forming method provided by the application adopts a ring blank to forge a fan blade ring forging, so that no skin is formed in the inner hole of the ring forging during forging, and the forging die used in forging has an outer ring and an inner ring, and a cavity of the forging die is formed between the outer ring and the inner ring, wherein the outer ring is provided with a trial ring forming gap, and the side wall of the trial ring forming gap is a first straight wall, so that no outer round burr is formed on the outer ring wall of the ring forging during forging, and a material allowing gap is arranged in the middle of the inner ring, so that part of the metal of the ring forging during forging will flow into the material allowing gap due to the fact that no outer round burr is formed on the outer ring wall of the ring forging, so as to form an inner round burr on the inner ring wall of the ring forging, and the diameter of the inner round burr is smaller than that of the outer round burr. Based on this, when the material amount of the ring blank is designed, the material amount of the ring blank is less because the material amount of the inner round burr is less than that of the outer round burr and no skin is formed, so that the material amount of the fan blade ring forging is less, and therefore, when the fan blade ring forging is forged by the method provided by the application, the material amount can be greatly saved, and the cost of the enterprise is saved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0020] Figure 1 is a flow chart of the fan blade ring forging forming method provided by the embodiment of the application;

[0021] Figure 2 is a structural schematic diagram of a fan blade ring forging formed by using the prior art forging forming method;

[0022] Figure 3 is a structural schematic diagram of a ring forging formed by using the fan blade ring forging forming method provided by the embodiment of the application;

[0023] Figure 4 is a structural schematic diagram of a forging die in the embodiment of the application;

[0024] Figure 5 is a structural schematic diagram of a ring blank in the embodiment of the application when the ring blank is placed in the forging die.

[0025] In the drawings:

[0026] 1-skin, 2-external flash, 3-ring forging, 31-inner flash, 32-second straight wall, 33-upper and lower draft angles, 4-forging die, 41-outer ring, 411-test ring forming gap, 4111-first straight wall, 42-inner ring, 421-allowance gap, 5-lifting steel plate, 6-elevator, 7-ring-shaped blank. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0028] Example:

[0029] This embodiment provides a forging method for a fan blade disk, such as Figure 1 As shown, the following steps are included:

[0030] Step 1: Design an annular forging 3 based on the fan blade disk part. Figure 3 As shown, the outer ring wall of the ring forging 3 is provided with a second straight wall 32, and the inner ring wall of the ring forging 3 is provided with upper and lower draft angles 33. It should be noted that the upper and lower draft angles 33 refer to the inner ring wall of the ring forging 3 being composed of an upwardly inclined surface and a downwardly inclined surface. The upwardly inclined surface and the downwardly inclined surface intersect at the middle position of the ring forging 3, and the intersection of the upwardly inclined surface and the downwardly inclined surface forms a parting line. Of course, the ring forging 3 is also provided with other draft angles. In addition to the above-mentioned parting draft angle 32, the remaining draft angles and the upper and lower draft angles 33 are set at 15°-45°, for example, 15°, 25°, 30°, 45°, etc.

[0031] Step 2: Design the ring forging 3 as follows Figure 4The shown forging die 4 has an outer ring 41 and an inner ring 42, and a cavity of the forging die 4 is formed between the outer ring 41 and the inner ring 42, wherein the outer ring 41 is provided with a ring forming gap 411, which can also be understood as a part of the cavity and is used for forming a ring on the outer ring wall of the annular forging 3, and a side wall of the ring forming gap 411 is provided as a first straight wall 4111, and a material allowing gap 421 is provided at a middle position of the inner ring 42, and the material allowing gap 421 is used for forming an inner circular flash 31 on the inner ring wall of the annular forging 3 during forging, and then a forming die is produced according to the designed forging die 4. Since the side wall of the ring forming gap 411 is provided as the first straight wall 4111, no outer circular flash 2 is formed at the outermost side of the annular forging 3, and the second straight wall 32 is formed, and thus part of the metal material will flow into the material allowing gap 421 to form the inner circular flash 31 on the inner ring wall of the annular forging 3 during forging. Obviously, the diameter of the inner circular flash 31 is smaller than the diameter of the outer circular flash 2.

[0032] It is worth noting that in the prior art, the upward and downward draft angles 33 are usually arranged on the outer ring wall of the annular forging 3, while in the method provided in the embodiment, the upward and downward draft angles 33 are arranged on the inner ring wall of the annular forging 3, and the upward and downward draft angles 33 are not only arranged for the convenience of taking out the annular forging 3 from the die, but more importantly, the upward and downward draft angles 33 can receive the inner circular flash 31.

[0033] In the embodiment, considering the forging forming force of the fan blade disc annular forging 3 during the forging pressing process, the cross-sectional thickness of the outer ring 41 and the inner ring 42 of the forging die 4 is greater than or equal to 30 mm, and specifically, the thickness of the outer ring 41 and the inner ring 42 can be set to 30 mm, 35 mm, 40 mm, etc.

[0034] In the embodiment, the height of the material allowing gap 421 of the forging die 4 is greater than or equal to 25 mm, that is, the inner circular flash 31 with a thickness of at least 25 mm is finally formed on the inner ring wall of the annular forging 3. For example, the height of the material allowing gap 421 is 25 mm, 26 mm, 27 mm, 28 mm, etc.

[0035] In order to facilitate the taking out of the annular forging 3 formed in the forming die provided by the present embodiment, the forging die 4 in the present embodiment further has a receiving groove located at the inner side of the inner ring 42, the receiving groove is connected with the cavity through the material gap 421, and the knockout plate 5 is placed in the receiving groove, and the forging die 4 further has a straight sliding hole in which the ejector rod 6 is slidingly installed, the ejector rod 6 is connected with the knockout plate 5, and the knockout plate 5 and the ejector rod 6 are used to knock up the formed annular forging 3 after the forging is completed. The inner circular flash 31 formed during the forging process needs to extend to overlap part of the knockout plate 5, so that when the annular forging 3 is formed by forging, the mold is first opened (that is, the upper die and the lower die of the forming die are driven to separate), and then the knockout plate 5 and the ejector rod 6 are used to knock up the formed annular forging 3, so as to take down the annular forging 3. Of course, the ejector rod 6 is connected with the hydraulic system, and the hydraulic system is used to drive the ejector rod 6 to knock the knockout plate 5, and the knockout plate 5 acts on the inner circular flash 31 of the annular forging 3, so as to knock up the annular forging 3. Alternatively, the knockout plate 5 and the ejector rod 6 are fixed by bolt connection.

[0036] The inner circular flash 31 with a thickness greater than or equal to 25 mm can also provide sufficient support force for the knockout of the annular forging 3, the thickness of the steel plate is greater than or equal to 20 mm, so that the steel plate also has sufficient strength to knock up the annular forging 3, the thickness of the steel plate is less than or equal to the depth of the receiving groove, and the gap between the outer side wall of the steel plate and the side groove wall of the receiving groove is at least 1 mm. Alternatively, the thickness of the steel plate can be 20 mm, 21 mm, 22 mm, etc. The diameter of the ejector rod 6 is greater than or equal to 60 mm and less than or equal to 100 mm, for example, the diameter of the ejector rod 6 is 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc.

[0037] Step 3: Design and manufacture the annular blank 7 according to the material and machining allowance of the fan blade ring forging 3.

[0038] Step 4: As shown in Figure 5 , place the annular blank 7 in the cavity of the forming die for forging to obtain the annular forging 3. The forging uses a forging machine, and the forging pressing speed is 8 mm / s. It should be noted that the positioning form of the annular blank 7 in the cavity is the same as that of the prior art, so it will not be described in detail here.

[0039] In the forging method of a fan blade disk provided in this embodiment, an annular blank is used to forge a fan blade disk annular forging 3. In this way, during the forging process, no continuous skin 1 is formed in the inner hole of the annular forging 3. In addition, the forging die 4 used for forging has an outer ring 41 and an inner ring 42. The outer ring 41 and the inner ring 42 form a cavity of the forging die 4. The outer ring 41 is provided with a trial ring forming gap. The side wall of the trial ring forming gap is provided as a first straight wall 4111. In this way, during the forging process, no outer circular flash 2 is formed on the outer ring wall of the annular forging 3. A material clearance gap 421 is provided in the middle of the inner ring 42. In this way, since no outer circular flash 2 is formed on the outer ring wall of the annular forging 3, part of the forging metal during the forging process will flow into the material clearance gap 421, thereby forming an inner circular flash 31 on the inner ring wall of the annular forging 3. The diameter of the inner circular flash 31 is smaller than the diameter of the outer circular flash 2. Based on this, when designing the amount of material for the annular blank, because the material used for the inner circular flash 31 is smaller than that for the outer circular flash 2 and no continuous skin 1 is formed, the amount of material used for the annular blank is less, thereby making the material used for the fan blade disk annular forging 3 less. Therefore, when forging the fan blade disk annular forging 3 by the method provided in this embodiment, the material can be greatly saved, saving costs for the enterprise.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A forging method for a fan blade disk, characterized in that: include: Step 1: Designing an annular forging (3) according to a fan blade disk part, wherein the outer ring wall of the annular forging (3) is set as a second straight wall (32), and the inner ring wall of the annular forging (3) is set with upper and lower draft angles (33); Step 2: designing a forging die (4) according to the annular forging (3), wherein the forging die (4) comprises an outer ring (41) and an inner ring (42), wherein the outer ring (41) and the inner ring (42) form a cavity of the forging die (4), wherein the outer ring (41) is provided with a trial ring forming gap (411), the side wall of the trial ring forming gap (411) is provided as a first straight wall (4111), and a material clearance gap (421) is provided in the middle of the inner ring (42), wherein the material clearance gap (421) is used to form an inner circular burr (31) on the inner ring wall of the annular forging (3) during the forging process, and then producing a forming die according to the designed forging die (4); Step 3: Designing and manufacturing an annular blank (7) according to the material and machining allowance of the annular forging (3) of the fan blade disk; Step 4: placing the annular blank (7) in the cavity of the forming die for forging to obtain the annular forging (3).

2. The forging method of a fan blade disk according to claim 1, characterized in that: The cross-sectional thicknesses of the outer ring (41) and the inner ring (42) of the forging die (4) designed in step 2 are both greater than or equal to 30 mm.

3. The forging method of a fan blade disk according to claim 1, characterized in that: The height of the clearance gap (421) of the forging die (4) designed in step 2 is greater than or equal to 25 mm.

4. The forging method of a fan blade disk according to claim 1, characterized in that: The forging die (4) designed in step 2 also has a receiving groove located on the inner side of the inner ring (42), the receiving groove is connected to the cavity through the material clearance (421), and a lifting steel plate (5) is placed in the receiving groove. The forging die (4) also has a straight sliding hole, and a push rod (6) is slidably installed in the straight sliding hole. The push rod (6) is connected to the lifting steel plate (5). The lifting steel plate (5) and the push rod (6) are used to lift the formed annular forging (3) after forging is completed.

5. The forging method of a fan blade disk according to claim 4, characterized in that: The jacking steel plate (5) and the jacking rod (6) are fixed by bolt connection.

6. The forging method of a fan blade disk according to claim 4, characterized in that: The thickness of the lifting steel plate (5) is greater than or equal to 20 mm, and the thickness of the lifting steel plate (5) is less than or equal to the depth of the accommodating groove, and the gap between the outer side wall of the lifting steel plate (5) and the side groove wall of the accommodating groove is at least 1 mm.

7. The forging method of a fan blade disk according to claim 4, characterized in that: The diameter of the push rod (6) is greater than or equal to 60 mm and less than or equal to 100 mm.

8. The forging method of a fan blade disk according to claim 1, characterized in that: The forging pressing speed in step 4 is 8 mm / s.

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