Forming die and forging method of a two-in-one structure compressor disc forging

Abstract

This invention provides a forming die for a two-in-one compressor disc forging, including an upper die, a lower die, an inner liner die for the intermediate ring die, and an outer ring die for the intermediate ring die. The upper die, the inner liner die for the intermediate ring die, and the lower die are used to form the upper, middle, and lower contours of the forging, respectively, and the three together form a forging die cavity for forging the two-in-one compressor disc forging. The outer ring die for the intermediate ring die is used to clamp the inner liner die for the intermediate ring die. This invention also provides a forging method using the above-mentioned forming die for a two-in-one compressor disc forging, including a double parting surface forging design; an intermediate ring die design; a bar billet and an upsetting intermediate billet design; upsetting of the bar billet; positioning and machining of the groove in the middle of the upsetting intermediate billet; and die forging of the upsetting intermediate billet. By adding a parting surface and using an intermediate ring die, this invention achieves small-margin forming of various parts of the forging, improves the yield of the forging and the efficiency of subsequent machining, and ensures the integrity of the forging's streamline, thereby improving the performance of the forging.

Description

Technical Field

[0001] This invention belongs to the field of hot working technology of metal materials, and specifically relates to a forming mold and forging method for a two-in-one structure compressor disc forging. Background Technology

[0002] The achievement of high power-to-weight ratio / thrust-to-weight ratio targets in advanced aero-engines relies on advanced structural design. For axial compressors, designing the compressor disks of adjacent two stages as a disk-to-disk integrated unit can reduce bolted connections, thereby reducing weight and improving component reliability, which is increasingly favored by design departments.

[0003] For compressor discs, the disc diameter is typically much larger than the hub diameter. If adjacent compressor discs are designed as an axially connected, integrated unit, it results in a disc blank structure of "hub (thin) - disc (coarse) - hub (thin) - disc (coarse) - hub (thin)". Traditional forging design and forging preparation usually involve enclosing the small-diameter connecting hub within the large-diameter disc portion during forming, followed by large turning operations to remove excess material from the connecting hub. This large enclosing structure leads to low disc yield and long machining cycles, making it unsuitable for mass production. Furthermore, turning operations disrupt the forging flow lines, reducing the disc's performance.

[0004] Therefore, finding a forging method for the disc blank forging of a two-in-one integrated compressor is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a forming mold and forging method for a two-in-one compressor disc forging, which can achieve small-allowance forming of various parts of the forging, thereby improving the yield and performance of the forging.

[0006] To solve the above-mentioned technical problems, the present invention provides a forming mold for a two-in-one compressor disc forging, comprising:

[0007] Upper die, used to form the upper contour of the forging;

[0008] The lower die is used to form the lower contour of the forging;

[0009] The intermediate ring die inner liner mold is a ring structure composed of multiple inner liner units, which is set between the upper die and the lower die to form the middle contour of the forging.

[0010] An annular outer sleeve of the intermediate ring mold is fitted over the outer side of the inner lining mold of the intermediate ring mold to tighten the inner lining mold of the intermediate ring mold;

[0011] The upper die, the intermediate ring die liner die, and the lower die together form a forging mold cavity for forging the two-in-one compressor disc forging.

[0012] Optionally, in the above-described forming mold, the intermediate ring mold liner includes two semi-annular liner units.

[0013] Optionally, in the above forming mold, the profile of the inner liner of the intermediate ring mold is consistent with the profile of the intermediate hub portion, and the outer diameter of the inner liner of the intermediate ring mold is larger than the maximum outer diameter of the forging.

[0014] Optionally, in the above forming mold, the outer ring wall of the intermediate ring mold inner liner mold and the inner ring wall of the intermediate ring mold outer sleeve are fitted with a beveled edge with an inclination angle ranging from 1° to 5°.

[0015] Optionally, in the above forming mold, both the inner liner mold of the intermediate ring mold and the outer ring mold of the intermediate ring mold are made of cast high-temperature alloy.

[0016] This invention also provides a forging method for a two-in-one compressor disc forging, characterized in that it uses the forming mold of the two-in-one compressor disc forging described above, comprising:

[0017] Step 1: Heat the billet to the forging temperature, hold it at the temperature and then upset it to obtain a drum-shaped upsetting intermediate billet;

[0018] Step 2: A ring groove is machined in the middle of the upsetting intermediate billet. The ring groove is used to fit with the inner liner mold of the intermediate ring mold.

[0019] Step 3: Install the inner liner mold and the outer ring sleeve of the intermediate ring mold in sequence at the annular groove of the upsetting intermediate billet, put the upsetting intermediate billet into the furnace and preheat it to the forging temperature, and take it out of the furnace after the heat preservation is completed;

[0020] Step 4: Install the upper and lower dies on the upsetting intermediate billet, and perform die forging by pressing the upper and / or lower dies with a press. After the die forging is completed, remove the forming mold and air cool it to obtain a two-in-one compressor disc forging.

[0021] Optionally, in the above forging method, step 1 includes: the bulge in the middle of the upsetting intermediate billet should be slightly larger than the inner diameter of the inner lining die of the intermediate ring die; the specifications of the billet are determined in reverse according to the upsetting intermediate billet; and the billet undergoes 30%-50% upsetting deformation to obtain the upsetting intermediate billet.

[0022] The volume formula for the billet is V 棒坯 = (102% ~ 108%) × V 锻件 .

[0023] Optionally, in the above forging method, step 1 further includes: adding a process allowance of 1mm-5mm on one side of the rough-machined blank structure of the forging, and the draft angle is 3°-7°.

[0024] Optionally, in the above forging method, step 2 further includes: determining the position of the annular groove is based on the arc-shaped outer edge of the upsetting intermediate billet, measuring the diameter Di at different heights of the upsetting intermediate billet, i = 1, 2, 3, 4, 5..., importing the diameter Di and height H of the intermediate billet at different heights into CAD software, obtaining the outer dimensions of the upsetting intermediate billet using spline interpolation, and determining the position of the annular groove in the CAD software, so that the billet volume above the annular groove can ensure the forming of the upper die, and the billet volume below the annular groove can ensure the forming of the lower die.

[0025] Optionally, in the above forging method, step 4 includes: installing the upper die and the lower die on a press, installing the intermediate ring die liner mold at the annular groove of the upsetting intermediate billet, and installing and tightening the intermediate ring die annular sleeve on the outside of the intermediate ring die liner mold.

[0026] This invention provides a forming mold for a two-in-one compressor disc forging, which has the following advantages:

[0027] By adding a parting surface and using an intermediate ring die, small-margin forming of the central hub portion of the two-in-one integral structure blank was achieved, improving the yield of the forging and the efficiency of subsequent machining. Simultaneously, it ensures a reasonable distribution of metal flow lines along the forging contour, guaranteeing the integrity of the flow lines and improving the performance of the forging.

[0028] The present invention also provides a forging method for a forming die of a compressor disc forging having the above-mentioned two-in-one structure, which has the same beneficial effects and will not be described in detail here. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 This is a structural schematic diagram of the two-in-one compressor disc forging provided by the present invention (the double-dotted lines represent the rough machining outline);

[0031] Figure 2This is a structural schematic diagram of the initial positioning state during the die forging process provided in an embodiment of the present invention;

[0032] Figure 3 This is a structural schematic diagram of the forging end state during the die forging process provided in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the upper mold provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the lower mold structure provided in an embodiment of the present invention;

[0035] Figure 6 This is a front view of the intermediate ring mold liner provided in an embodiment of the present invention;

[0036] Figure 7 This is a top view of the intermediate ring mold liner provided in an embodiment of the present invention;

[0037] Figure 8 This is a front view of the annular outer sleeve of the intermediate ring mold provided in an embodiment of the present invention;

[0038] Figure 9 This is a top view of the annular outer sleeve of the intermediate ring mold provided in an embodiment of the present invention.

[0039] In the image above:

[0040] A - Upper parting surface; B - Lower parting surface;

[0041] 1-Upper mold; 2-Upsetting intermediate blank; 3-Intermediate ring mold outer ring; 4-Intermediate ring mold inner liner; 5-Lower mold. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] In the description of this invention, "multiple" means two or more. If "first" and "second" are mentioned, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0045] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0046] The core of this invention is to provide a forming mold and forging method for a two-in-one compressor disc forging, which can achieve small-margin forming of various parts of the forging, thereby improving the yield and performance of the forging.

[0047] To enable those skilled in the art to better understand the technical solutions provided by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] For details, please refer to Figures 1-9 The present invention provides a forming mold for a two-in-one structure compressor disc forging, comprising: an upper mold 1, a lower mold 5, an inner liner mold 4 for an intermediate ring mold, and an outer ring mold 3 for an intermediate ring mold.

[0049] The upper die 1 is used to form the upper contour of the forging, and the upper parting surface A is set on the connection surface between the upper disc and the middle hub.

[0050] The lower die 5 is used to form the lower contour of the forging, and the lower parting surface B is set on the connection surface between the lower disc and the intermediate hub.

[0051] The intermediate ring die inner liner type die 4 is a ring structure composed of multiple inner liner units, and is set between the upper die 1 and the lower die 5 to form the middle contour of the forging.

[0052] The intermediate ring mold outer sleeve 3 is fitted on the outside of the intermediate ring mold inner liner mold 4 to lock the intermediate ring mold inner liner mold 4.

[0053] The upper die 1, the middle ring die liner die 4, and the lower die 5 together form a forging mold cavity for forging a two-in-one compressor disc forging.

[0054] It should be noted that the two-in-one compressor disc forging includes two large-diameter discs and an intermediate hub to form an integral structure of adjacent stage discs combined into one.

[0055] The upper die 1 and the lower die 5 correspond to the upper and lower large-diameter disc parts of the forging, respectively, while the middle ring die corresponds to the middle hub part of the forging.

[0056] The upper parting surface A is set on the connection surface between the upper disc and the middle hub, and the lower parting surface B is set on the connection surface between the lower disc and the middle hub. For example... Figure 1 As shown, an upper parting surface A and a lower parting surface B are designed on the connection surfaces between the two large-diameter discs and the middle hub, respectively. The upper parting surface A is formed by upper mold 1, and the lower parting surface B is formed by lower mold 5. The two parting surfaces are formed by an intermediate ring mold liner mold 4.

[0057] The forming mold for the two-in-one compressor disc forging provided by the present invention, by adding a parting surface and using an intermediate ring mold, realizes the small-allowable forming of the middle hub part of the two-in-one integral structure disc blank, improves the yield of the forging and the subsequent machining efficiency, and enhances the performance of the forging.

[0058] In one specific embodiment, the intermediate ring die liner mold 4 includes two semi-circular liner units. After assembly, the profile of the mold is consistent with the profile of the intermediate hub part, and the outer diameter of the intermediate ring die liner mold 4 is greater than the maximum outer diameter of the forging.

[0059] In one specific embodiment, the outer ring wall of the intermediate ring mold inner liner 4 and the inner ring wall of the intermediate ring mold annular outer sleeve 3 are inclined at an angle of 1°-5° (preferably 3°) (the inclined direction of the inclined side is as follows). Figure 2 As shown, the ring is fitted together to prevent the intermediate ring die ring sleeve 3 from falling during the working process and to facilitate disassembly after forging.

[0060] Specifically, the intermediate ring die is made of a high-temperature casting alloy, such as N3 alloy. Of course, other materials can also be selected based on the forging temperature adaptability.

[0061] Furthermore, this invention also provides a forging method for a two-in-one compressor disc forging, which utilizes the forming mold of the aforementioned two-in-one compressor disc forging and includes the following steps:

[0062] Step 1: Heat the billet to the forging temperature, hold it at the temperature and then perform upsetting to obtain a drum-shaped upsetting intermediate billet 2;

[0063] Step 2: A ring groove is machined in the middle of the upsetting intermediate billet 2. The ring groove is used to fit with the inner liner mold 4 of the intermediate ring mold.

[0064] Step 3: Install the intermediate ring die inner liner mold 4 and the intermediate ring die outer ring sleeve 3 in sequence at the annular groove of the upsetting intermediate billet 2, put the upsetting intermediate billet 2 into the furnace and preheat it to the forging temperature, and take it out of the furnace after the heat preservation is completed.

[0065] Step 4: Install the upper die 1 and lower die 5 on the upsetting intermediate billet 2, and perform die forging by pressing the upper die 1 and / or lower die 5 through a press. After die forging, remove the forming mold and air cool to obtain a two-in-one compressor disc forging. Specifically, install the upper die 1 and lower die 5 on the press, install the intermediate ring die inner liner 4 on the annular groove of the upsetting intermediate billet 2, and install and tighten the intermediate ring die annular sleeve 3 on the outside of the intermediate ring die inner liner 4 before performing die forging.

[0066] The two-in-one compressor disk prepared by this method has a small machining allowance, which allows the metal flow lines to be reasonably distributed along the contour of the forging, ensuring the integrity of the flow lines and good uniformity of the microstructure and properties, which is beneficial to improving the performance of the forging. At the same time, it can meet the preparation requirements of the integrated structure compressor disk of advanced aero-engines.

[0067] In order to reasonably estimate the forging dimensions, step 1 includes: determining the billet specifications in reverse based on the upsetting intermediate billet 2, and obtaining the upsetting intermediate billet 2 by upsetting the billet by 30%-50%;

[0068] The volume formula for a bar billet is V 棒坯 = (102% ~ 108%) × V 锻件 .

[0069] Forgings should have a 1mm-5mm machining allowance added to one side of the rough-machined blank structure, with a draft angle of 3°-7°.

[0070] Furthermore, the position of the annular groove is determined by measuring the diameter Di of the upsetting intermediate billet 2 at different heights, i = 1, 2, 3, 4, 5..., and importing the diameter Di and height H of the intermediate billet at different heights into the CAD software. The outer dimensions of the upsetting intermediate billet 2 are obtained by using spline interpolation. The position of the annular groove is determined in the CAD software so that the part above the annular groove can ensure the forming of the upper mold 1, and the billet volume below the annular groove can ensure the forming of the lower mold 5.

[0071] Based on the above specific embodiments, the present invention provides a forging method for compressor disk forgings with an integrated adjacent-stage disk-disk structure, the method comprising the following steps:

[0072] (1) Design of double parting surface forging

[0073] Two parting surfaces are designed on the connection surfaces between the two large-diameter discs and the middle hub. The upper parting surface A and above are formed by upper mold 1, and the lower parting surface B and below are formed by lower mold 5. The two parting surfaces are formed by an intermediate ring mold.

[0074] (2) Intermediate ring mold design

[0075] The intermediate ring die is designed for forming the intermediate connecting wheel hub. The intermediate ring die includes an inner liner die 4 and an outer ring die 3. The inner liner die 4 is a split structure of two semi-circular parts. After assembly, the profile of the inner liner die 4 is consistent with the profile of the intermediate wheel hub. The outer diameter of the inner liner die 4 is larger than the maximum outer diameter of the forging.

[0076] (3) Design of bar billet and upsetting intermediate billet 2

[0077] Before die forging, the billet is upset to ensure that the forging has a uniform deformation. The outer diameter of the upset intermediate billet 2 is designed to be larger than (slightly larger than) the diameter of the inner liner mold 4 of the intermediate ring mold. The specifications of the bar are determined in reverse based on the upset intermediate billet 2.

[0078] (4) Upsetting of bar billet

[0079] The billet is heated to the forging temperature, and after the holding period, it is taken out of the furnace and upset according to the designed deformation amount to obtain the drum-shaped upset intermediate billet 2.

[0080] (5) Positioning and machining of the annular groove of the upsetting intermediate billet 2

[0081] An annular groove is machined at a set position in the upsetting intermediate billet 2, and the annular groove is fitted with the inner liner mold 4 of the intermediate ring mold with a clearance fit.

[0082] (6) Upsetting intermediate billet 2 forging

[0083] The intermediate ring die is installed in the annular groove of the upsetting intermediate billet 2. The upsetting intermediate billet 2 with the intermediate ring die installed is placed in the furnace and preheated to the forging temperature. After the heat preservation is completed, it is taken out of the furnace for die forging. After the die forging is completed, the intermediate ring die is removed and the forging is air-cooled to obtain a two-in-one integral structure die forging.

[0084] This embodiment details the implementation process of the present invention using a certain type of third- and fourth-stage bladed disk:

[0085] (1) Design of double parting surface forging

[0086] A parting surface A is designed on the connection surface between the third-stage blade disk and the intermediate hub, and a lower parting surface B is designed on the connection surface between the fourth-stage blade disk and the intermediate hub. The forging design includes a 3mm process allowance on one side of the rough-machined blank structure, with a draft angle of 5°. The forging volume is 9.33 × 10⁻⁶. 6 mm 3 .

[0087] (2) Intermediate ring mold design

[0088] Based on the forging in step (1), the mold is designed. The upper parting surface A is designed as the upper mold 1, and the lower parting surface B is designed as the lower mold 5. An intermediate ring mold is designed between the two parting surfaces. The inner liner mold 4 of the intermediate ring mold is a two-semi-annular split structure. After assembly, the profile of the inner liner mold 4 of the intermediate ring mold is consistent with the profile of the intermediate hub part. The outer diameter of the inner liner mold 4 of the intermediate ring mold is larger than the maximum outer diameter of the forging. The outer wall of the inner liner mold 4 of the intermediate ring mold and the inner wall of the annular outer sleeve 3 of the intermediate ring mold are fitted with a 3° bevel. The intermediate ring mold is made of cast high-temperature alloy.

[0089] (3) Design of bar billet and upsetting intermediate billet 2

[0090] Select a bar billet with dimensions of Φ180mm × 385mm, an upsetting deformation of 40%, and an intermediate upsetting billet of approximately Φ232mm × 231mm. The inner diameter of the intermediate ring die is Φ212mm. The volume of the bar stock is V. 棒材 =9.80×10 6 mm 3 V_bar = 105% × V 锻件 .

[0091] (4) Upsetting of bar billet

[0092] The billet is heated to the forging temperature, and after the holding period, it is taken out of the furnace for upsetting. The upsetting deformation is 40%, resulting in an upsetting intermediate billet 2 with a bulging center.

[0093] (5) Positioning and machining of the annular groove of the upsetting intermediate billet 2

[0094] The external dimensions of the upsetting intermediate billet 2 are determined using 5-point interpolation (measuring the diameters of the upper end face, lower end face, 1 / 4 height, 1 / 2 height, and 3 / 4 height). The position of the annular groove is determined using CAD, ensuring that the volume V of the portion above the annular groove is [value missing]. 上 =3.98×10 6 mm 3 Volume V of the portion below the annular groove 下 =4.31×10 6 mm 3 The annular groove is machined in conjunction with the intermediate ring mold.

[0095] (6) Upsetting intermediate billet 2 forging

[0096] The upper die 1 and lower die 5 are installed on the press. The inner liner die 4 of the two semi-annular intermediate ring dies is installed in the annular groove of the upsetting intermediate billet 2, and the annular outer sleeve 3 of the intermediate ring die is installed on the outside and tightened. The upsetting intermediate billet 2 with the intermediate ring die installed is put into the furnace and preheated to the forging temperature. After the temperature is maintained, it is taken out of the furnace for die forging. After the die forging is completed, the intermediate ring die is removed to obtain a two-in-one integral structure die forging.

[0097] The two-in-one integral compressor disk prepared by this method has a small machining allowance, a reasonable distribution of streamlines, and good uniformity of microstructure and properties, which can meet the preparation requirements of integral compressor disks for advanced aero engines.

[0098] The beneficial effects of the technical solution provided by this invention include:

[0099] (1) By adding a parting surface and using an intermediate ring die, the small allowance forming of the intermediate hub part of the two-in-one integral structure blank is realized, which improves the yield of forgings and the subsequent machining efficiency. At the same time, the metal flow lines are reasonably distributed along the outline of the forging, ensuring the integrity of the flow lines and improving the performance of the forging.

[0100] (2) During the upsetting process, the billet undergoes large deformation in the middle and small deformation at both ends. During the die forging process, the billet undergoes large deformation at both ends and small deformation in the middle (the clamping of the middle ring die restricts the flow of metal). Through the combined deformation of upsetting and die forging, the billet can undergo uniform cumulative deformation, thereby obtaining a uniform microstructure.

[0101] (3) The intermediate ring mold adopts a split design, which facilitates the installation and disassembly of the intermediate ring mold, and has operational flexibility and reusability.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0103] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A forging method for a two-in-one compressor disc forging, characterized in that, The forming die for the two-in-one compressor disc forging includes: Upper die, used to form the upper contour of the forging; The lower die is used to form the lower contour of the forging; The intermediate ring die inner liner mold is a ring structure composed of multiple inner liner units, and is set between the upper die and the lower die to form the central contour of the forging; An annular outer sleeve of the intermediate ring mold is fitted over the outer side of the inner lining mold of the intermediate ring mold to tighten the inner lining mold of the intermediate ring mold; The upper die, the intermediate ring die liner die, and the lower die together form a forging mold cavity for forging the two-in-one compressor disc forging. include: Step 1: Heat the billet to the forging temperature, hold it at the temperature and then upset it to obtain a drum-shaped upsetting intermediate billet; Step 2: A ring groove is machined in the middle of the upsetting intermediate billet. The ring groove is used to fit with the inner liner mold of the intermediate ring mold. Step 3: Install the upper die and the lower die on the press respectively; install the intermediate ring die liner mold on the annular groove of the upsetting intermediate billet; install the intermediate ring die outer sleeve on the outside of the intermediate ring die liner mold and tighten it; put the upsetting intermediate billet with the intermediate ring die installed into the furnace for preheating to the forging temperature; after holding at the temperature, take it out of the furnace for die forging; use the press to press the upper die and / or the lower die for die forging; after die forging, remove the forming mold and air cool it to obtain a two-in-one structure compressor disc forging; The position of the annular groove is determined by measuring the diameter Di of the upsetting intermediate billet at different heights, i=1, 2, 3, 4, 5..., targeting the arc-shaped outer edge of the upsetting intermediate billet. The diameter Di and height H of the upsetting intermediate billet at different heights are then imported into CAD software. The outer dimensions of the upsetting intermediate billet are obtained using spline interpolation. The position of the annular groove is then determined in the CAD software, ensuring that the portion above the annular groove can guarantee the forming of the upper die, and that the volume of the billet below the annular groove can guarantee the forming of the lower die.

2. The forging method according to claim 1, characterized in that, Step 1 includes: determining the billet specifications in reverse based on the upset intermediate billet, and obtaining the upset intermediate billet by the billet undergoing an upsetting deformation of 30%-50%; The volume formula for the billet is V 棒坯 = (102%~108%) × V 锻件 .

3. The forging method according to claim 1, characterized in that, The intermediate ring mold inner liner includes two semi-circular inner liner units.

4. The forging method according to claim 1, characterized in that, The two-in-one compressor disc forging includes two large-diameter discs and an intermediate hub to form an integral structure of adjacent-stage discs. The profile of the inner liner of the intermediate ring die is consistent with the profile of the intermediate hub. The outer diameter of the inner liner of the intermediate ring die is larger than the maximum outer diameter of the forging.

5. The forging method according to claim 1, characterized in that, The outer ring wall of the intermediate ring mold inner liner mold and the inner ring wall of the intermediate ring mold outer ring are fitted with a beveled edge with an inclination angle ranging from 1° to 5°.

6. The forging method according to claim 1, characterized in that, Both the inner liner mold of the intermediate ring mold and the outer ring mold of the intermediate ring mold are made of cast high-temperature alloy.

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