A forming method and forming system for seamless frame forgings

Abstract

The present invention belongs to the field of forming of seamless frame forgings, and specifically relates to a forming method and forming system of seamless frame forgings. It comprises: step S11, based on the abutment between the ring blank and the support, driving the first half-die and / or the second half-die to extrude the ring blank to the first forming state along the radial direction of the ring blank to obtain the first forging; step S12, based on the first forging, driving the punch through the center hole of the first forging to the second forming state to obtain the second forging; step S13, based on the second forging, driving the first half-die and / or the second half-die to extrude the second forging to the third forming state to obtain the third forging. This solves the problem in the prior art that the seamless frame forging is obtained by extruding the ring blank once, which is prone to excessive local stress and cannot sufficiently forge the forging, which ultimately leads to insufficient strength of the forging.

Description

Technical Field

[0001] The invention belongs to the field of forming of seamless frame forgings, and in particular relates to a forming method and a forming system of seamless frame forgings. Background Art

[0002] Seamless frame forgings are a common part in aircraft engines. They are fan-shaped and multi-sided parts. Since most seamless frame forgings are special-shaped, they are difficult to form. In the current production process of seamless frame forgings, the material bar is upset, punched, and rolled into a ring blank. The ring blank is then extruded once with an extrusion die and punched with a punch to finally obtain a seamless frame forging.

[0003] In the existing one-time extrusion forming of seamless frame forgings, there is a problem that due to the excessive punch speed and excessive impact force, the local stress of the forging is easily excessive, the forging cannot be sufficiently forged, and finally the forging strength is insufficient. Summary of the invention

[0004] In order to solve the problem in the prior art that a seamless frame forging is obtained by extruding a ring blank once, local stress is easily excessive, the forging cannot be sufficiently forged, and finally the forging strength is insufficient, the present invention provides a forming method and a forming system for a seamless frame forging:

[0005] In a first aspect, the present invention provides a method for forming a seamless frame forging, comprising the following steps:

[0006] Step S11, based on the abutment between the ring blank and the support, driving the first half-die and / or the second half-die to extrude the ring blank in the radial direction of the ring blank to a first forming state to obtain a first forging; wherein the first forming state includes that the minimum distance between the first half-die and the second half-die is a first set value;

[0007] Step S12, based on the first forging, driving a punch through the center hole of the first forging to a second forming state, to obtain a second forging; wherein the second forming state includes the entry portion of the punch being inserted into the avoidance hole of the support, and the punching portion of the punch being in contact with the first forging;

[0008] Step S13, based on the second forging, driving the first half-die and / or the second half-die to extrude the second forging to a third forming state to obtain a third forging; wherein the third forming state includes a minimum distance between the first half-die and the second half-die being a second set value.

[0009] In some embodiments, in step S11, the first set value is K, K=(0.029-0.048)×L; wherein L is the outer diameter circumference of the ring blank.

[0010] In some embodiments, in step S11, the force exerted by the first half-mold and / or the second half-mold in radial direction of the ring blank to press the ring blank is 3.6-5.6 MPa.

[0011] In some embodiments, in step S13, the force of the first half-die and / or the second half-die to extrude the second forging is 4.2-6.6 MPa.

[0012] In some embodiments, in step S13, the third forming state includes an inner surface of the third forging having an interference fit with the punch, a portion of the outer surface of the third forging having an interference fit with the first half-die, and a portion of the outer surface having an interference fit with the second half-die.

[0013] In some embodiments, in step S13, the third forging and the punch are kept under pressure for 10 to 15 seconds.

[0014] In some embodiments, in the forming method of the seamless frame forging, the temperature of the ring blank, the first forging, and the second forging is 850-1080°C; the temperature of the first half-die, the second half-die, the punch, and the support is 150-450°C.

[0015] In some embodiments, step S13 includes:

[0016] Step S131, based on the second forging, driving the first half-die and / or the second half-die to extrude the second forging to a third forming state;

[0017] Step S132: Based on the third forming state, driving the die to abut against one end surface of the second forging to obtain a third forging.

[0018] In some embodiments, the forming method of the seamless frame forging further includes step S14, based on the third forging, heat treating the third forging, wherein the insulation temperature of the heat treatment is 1138° C. to 1193° C., and the insulation time is 60 min to 66 min.

[0019] In a second aspect, this embodiment provides a forming system for a seamless frame forging, which is applied to a forming method for a seamless frame forging described in the first aspect, including:

[0020] The support, the first half-die, the second half-die, the punch, and the ring blank; the first half-die and the second half-die are respectively connected to the same end surface of the support in a sliding manner; the punch is located between the first half-die and the second half-die, and is spaced apart from the first half-die and the second half-die; the first half-die, the second half-die, the support, and the punch together form an extrusion area; the end surface of the support connected to the first half-die in a sliding manner is concavely provided with an avoidance hole, and the avoidance hole is spaced apart from the first half-die and the second half-die; the punch includes an entry portion and a stamping portion, the entry portion is fixedly connected to the stamping portion; the cross section of the entry portion gradually decreases from one end close to the stamping portion to one end away from the stamping portion;

[0021] The forming system of the seamless frame forging includes a first working state, a second working state, and a third working state; the first working state includes that one end face of the ring blank abuts against the end face of the support, the ring blank is located between the first half-die and the second half-die, and the first half-die and / or the second half-die are driven to extrude the ring blank along the radial direction of the ring blank to the first forming state; the second working state includes driving the punch through the center hole of the first forging to the second forming state; the third working state includes driving the first half-die and / or the second half-die to extrude the second forging to the third forming state.

[0022] In order to solve the problem in the prior art that the seamless frame forging is obtained by extruding the ring blank once, the local stress is easily too large, the forging cannot be sufficiently forged, and finally the forging strength is insufficient, the present invention has the following advantages:

[0023] The first forging is formed by extruding the ring blank through the first half die and the second half die, so that a partial area of ​​the ring blank is subjected to a compression process, and then the punch abuts against the first forging, so that a partial area of ​​the first forging is subjected to a tension process, thereby obtaining a second forging, and then the second forging is extruded through the first half die and the second half die, so that a partial area of ​​the second forging is subjected to a compression process, thereby obtaining a third forging, so that a partial area of ​​the seamless frame forging is first subjected to compression, then to tension, and then to compression, thereby forming a forging process, so that the seamless frame forging has a forged area, and the strength of the forging is increased during the forging process, thereby solving the problem in the prior art that the seamless frame forging is obtained by extruding the ring blank once, which is prone to excessive local stress and the forging cannot be sufficiently forged, thereby ultimately leading to insufficient strength of the forging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a flow chart of a forming method of a seamless frame forging;

[0025] Figure 2 It is a schematic diagram of the ring blank being located in the extrusion area;

[0026] Figure 3 is a schematic diagram of forming the first forging;

[0027] Figure 4 is a schematic diagram of forming the second forging;

[0028] Figure 5 It is a schematic diagram of the die pressing down;

[0029] Figure 6 is a schematic diagram of forming the third forging;

[0030] Figure 7 It is a schematic diagram of the structure of the punch;

[0031] Figure 8 It is a structural schematic diagram of the stamping part;

[0032] Fig. 9 A schematic plan view of the first half mold and the second half mold extruding the ring blank;

[0033] Fig.10 A schematic plan view of the first half mold and the second half mold extruding the ring blank to a first forming state;

[0034] Fig.11 A schematic plan view of driving the punch through the center hole of the first forging to the second forming state;

[0035] Fig.12 It is a plan view schematic diagram of the first half-die and the second half-die extruding the second forging to a third forming state.

[0036] In the figure: 11, first half mold; 111, first extrusion part; 112, first parting part; 12, punch; 121, entry part; 122, stamping part; 1221, first shaping part; 1222, second shaping part; 13, pressing die; 131, pressing part; 132, closing part; 133, accommodating hole; 14, second half mold; 141, second extrusion part; 142, second parting part; 15, support; 151, supporting part; 152, avoidance hole; 20, ring blank; 21, first forging part; 22, second forging part; 30, first forging; 31, third forging part; 32, fourth forging part; 40, second forging; 41, fifth forging part; 42, sixth forging part; 50, third forging. DETAILED DESCRIPTION

[0037] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0038] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0039] This embodiment discloses a method for forming a seamless frame forging. Figures 1 to 5 As shown, including:

[0040] Step S11, based on the abutment between the ring blank 20 and the support 15, driving the first half-die 11 and / or the second half-die 14 to extrude the ring blank 20 to a first forming state along the radial direction of the ring blank 20, to obtain a first forging 30; wherein the first forming state includes that the minimum distance between the first half-die 11 and the second half-die 14 is a first set value;

[0041] Step S12, based on the first forging 30, driving the punch 12 to pass through the center hole of the first forging 30 to a second forming state, to obtain a second forging 40; wherein the second forming state includes the entry portion 121 of the punch 12 inserted into the avoidance hole 152 of the support 15, and the stamping portion 122 of the punch 12 abuts against the first forging 30;

[0042] Step S13, based on the second forging 40, drive the first half-die 11 and / or the second half-die 14 to extrude the second forging 40 to a third forming state to obtain a third forging 50; wherein the third forming state includes a minimum distance between the first half-die 11 and the second half-die 14 being a second set value.

[0043] In this embodiment, the driving device of the first half mold 11, the second half mold 14, and the punch 12 can be a hydraulic press, and the first half mold 11, the second half mold 14, and the punch 12 are detachably connected to the hydraulic cylinder of the hydraulic press. Figure 2 , Figure 3 As shown, the first half mold 11 includes a first extrusion portion 111 and two first mold-parting portions 112; the first extrusion portion 111 is located between the two first mold-parting portions 112, and the first extrusion portion 111 is fixedly connected to the first mold-parting portion 112; the second half mold 14 includes a second extrusion portion 141 and two second mold-parting portions 142; the second extrusion portion 141 is located between the two second mold-parting portions 142, and the second extrusion portion 141 is fixedly connected to the second mold-parting portion 142; the first set value and the second set value between the first half mold 11 and the second half mold 14 are both the distance between the first mold-parting portion 112 and the second mold-parting portion 142. In this embodiment, when the distance between the first parting portion 112 and the second parting portion 142 is the second set value, the first extrusion surface of the first extrusion portion 111 and the second extrusion surface of the second extrusion portion 141 are smoothly transitioned and closed. In this embodiment, the first extrusion surface is the contact surface between the first extrusion portion 111 and the third forging 50; the second extrusion surface is the contact surface between the second extrusion portion 141 and the third forging 50.

[0044] In this embodiment, the punch 12 includes an entry portion 121 and a stamping portion 122; the stamping portion 122 includes a first shaping portion 1221 and a second shaping portion 1222 that are fixedly connected; the entry portion 121 is fixedly connected to the stamping portion 122; the fixed connection between the entry portion 121 and the stamping portion 122 can be smoothly transitioned, so that when the entry portion 121 passes through the center hole of the first forging 30, the end surface of the first forging 30 will not block the stamping portion 122 from passing through the center hole of the first forging 30, and the stamping portion 122 passes through the first forging. After the center hole of the first forging 30 is formed, the connection between the first forging 30 and the entry portion 121 is located outside the end surface of the first forging 30, so that when the first half-die 11 and the second half-die 14 extrude the second forging 40, the inner surface of the second forging 40 abuts against the stamping portion 122 to have a more regular shape; the support 15 includes a supporting portion 151 and an avoidance hole 152; the avoidance hole 152 is formed inwardly from one end surface of the supporting portion 151; the volume of the avoidance hole 152 is greater than that of the entry portion 121, and the avoidance hole 152 can accommodate the entry portion 121.

[0045] In this embodiment, if Figure 6 As shown, after obtaining the third forging 50 , the first half-die 11 , the second half-die 14 , the punch 12 and the third forging 50 can be separated from each other, and the third forging 50 can be removed.

[0046] In this implementation, if Figure 7 , Figure 8 As shown, the stamping portion 122 includes a first shaping portion 1221 and a second shaping portion 1222. Figure 9-12 As shown, the ring blank 20 includes a first forged portion 21 and a second forged portion 22 that are fixedly connected; the first forged piece 30 includes a third forged portion 31 and a fourth forged portion 32 that are fixedly connected; and the second forged piece 40 includes a fifth forged portion 41 and a sixth forged portion 42 that are fixedly connected. Fig. 9 and Fig.10 As shown, the first half die 11 and / or the second half die 14 are driven by a force of magnitude F1 to move radially along the ring blank 20, so that the first extrusion portion 111 extrudes the ring blank 20, the first extrusion portion 111 of the first half die 11 extrudes the first forging portion 21, and the second extrusion portion 141 of the second half die 14 extrudes the second forging portion 22, so that the first forging portion 21 and the second forging portion 22 of the ring blank 20 form a pressure process, and when the first extrusion portion 111 and the second extrusion portion 141 extrude the ring blank 20 to the first forming state, the ring blank 20 is extruded into the first forging 30; the minimum distance between the first split die portion 112 and the second split die portion 142 is the first set value, at this time, the first set value is K, the first forging portion 21 is extruded into the third forging portion 31, and the second forging portion 22 is extruded into the fourth forging portion 32; as shown Fig.10 and Fig.11As shown, the punch 12 is driven to pass through the center hole of the first forging 30, and the entry portion 121 of the punch 12 is inserted into the avoidance hole 152 of the support 15, and the punching portion 122 of the punch 12 abuts against the first forging 30. At this time, the first shaping portion 1221 in the punching portion 122 squeezes the third forging portion 31, so that the third forging portion 31 generates a tensile process, and the second shaping portion 1222 squeezes the fourth forging portion 32, so that the fourth forging portion 32 generates a tensile process. After the tensile process, the third forging portion 31 becomes the fifth forging portion 41 in the second forging 40, and the fourth forging portion 32 becomes the sixth forging portion 42 in the second forging 40; as shown in FIG. Fig.11 and Fig.12 As shown, the first half-die 11 and / or the second half-die 14 are driven to extrude the second forging 40 with a force of F2 until the K value reaches a second set value, where the K value may be 0. During this process, the first extrusion portion 111 of the first half-die 11 extrude the fifth forging portion 41, and the second extrusion portion 141 of the second half-die 14 extrude the sixth forging portion 42. During this process, the fifth forging portion 41 and the sixth forging portion 42 generate a compression process, thereby obtaining the third forging 50.

[0047] In this embodiment, the first forging 30 is formed by extruding the ring blank 20 by the first half die 11 and the second half die 14, so that a partial area of ​​the ring blank 20 is subjected to a compression process, and then the punch 12 abuts against the first forging 30, so that a partial area of ​​the first forging 30 is subjected to a tension process, thereby obtaining a second forging 40, and then the second forging 40 is extruded by the first half die 11 and the second half die 14, so that a partial area of ​​the second forging 40 is subjected to a compression process, thereby obtaining a third forging 50, which can make a partial area of ​​the seamless frame forging first subjected to compression, then subjected to tension, and then subjected to compression, forming a forging process, so that the seamless frame forging has a forged area, and then the strength of the forging is increased during the forging process, thereby solving the problem in the prior art that the seamless frame forging is obtained by extruding the ring blank 20 once, which is prone to excessive local stress and cannot be sufficiently forged, thereby ultimately resulting in insufficient strength of the forging. Furthermore, by means of two-step extrusion forging of the first half die 11 and the second half die 14, a gap can be left between the first half die 11 and the second half die 14 before the punch 12 punches the first forging 30, thereby preventing excessive internal stress concentration of the first forging 30 during the punching process of the punch 12, thereby reducing the occurrence of irregular deformation caused by excessive stress concentration on the outer surface of the first forging 30 during the punching process of the first forging 30.

[0048] In some embodiments, Figure 3 As shown, in the step S11, the first set value is K, K=(0.029-0.048)×L; wherein L is the outer diameter circumference of the ring blank 20.

[0049] In this embodiment, the ring blank 20 is extruded by the first half die 11 and the second half die 14, and the distance between the first half die 11 and the second half die 14 after extruding the ring blank 20 is K. The value of K is set according to the outer diameter circumference L of the ring blank 20, and the value of K is 0.029 to 0.048 times of L, so that the value of K is correspondingly increased for the ring blank 20 with a larger L, and the value of K is correspondingly reduced for the ring blank 20 with a smaller L. According to the formula, the value of K can be quickly found for different values ​​of L, and the corresponding K value can be designed according to different outer diameter circumferences of the ring blank 20, so that when the first half die 11 and the second half die 14 extrude ring blanks 20 with different outer diameters, a suitable punch 12 punching position is found, thereby ensuring that the punch 12 passes through the center hole of the first forging 30, and the first forging 30 is effectively punched, thereby improving the forging forming efficiency.

[0050] In some embodiments, in the step S11, the force of the first half mold 11 and / or the second half mold 14 in the radial direction of the ring blank 20 to press the ring blank 20 is 3.6-5.6 MPa.

[0051] In this embodiment, by setting the force of the first half die 11 and / or the second half die 14 to squeeze the ring blank 20 in the radial direction of the ring blank 20 to 3.6-5.6 MPa, it is possible to ensure smooth extrusion of the ring blank 20, so that the ring blank 20 is gradually deformed to the first forging 30, and the extrusion efficiency of the ring blank 20 can be improved, and the stress concentration in the first forging 30 can be reduced as much as possible. According to the different outer diameters of the ring blank 20, the corresponding extrusion force can be selected from 3.6-5.6 MPa, and a larger extrusion force can be selected for the ring blank 20 with a larger outer diameter.

[0052] In some embodiments, in the step S13, the force of the first half-die 11 and / or the second half-die 14 for squeezing the second forging 40 is 4.2-6.6 MPa.

[0053] In this embodiment, by setting the force of the first half die 11 and / or the second half die 14 to squeeze the second forging 40 to 4.2-6.6 MPa, it is possible to achieve that when squeezing the second forging 40, the second forging 40 is uniformly transitioned to the third forging 50, so that the shape of the third forging 50 is more complete. In this embodiment, different squeezing forces can be selected from 4.2-6.6 MPa according to different sizes of the second forgings 40, and a larger squeezing force can be selected for the second forging 40 with a larger shape.

[0054] In some embodiments, in step S13, the third forming state includes an inner surface of the third forging 50 having an interference fit with the punch 12, a portion of the outer surface of the third forging 50 having an interference fit with the first half-die 11, and a portion of the outer surface having an interference fit with the second half-die 14.

[0055] In this embodiment, the inner surface of the third forging 50 is interference fit with the stamping portion 122 of the punch 12, part of the outer surface of the third forging 50 is interference fit with the first half die 11, and part of the outer surface is interference fit with the second half die 14, so that the shape of the third forging is closer to the shape of the required seamless frame forging, thereby reducing the subsequent processing of the third forging 50 and improving production efficiency. And as needed, for third forgings 50 of different shapes, the first half die 11, the second half die 14, and the punch 12 can be replaced to achieve the third forging 50 of the required shape by extruding the ring blank 20.

[0056] In some embodiments, in step S13, the third forging 50 and the punch 12 are kept under pressure for 10 to 15 seconds.

[0057] In this embodiment, by holding the third forging 50 and the punch 12 for 10 to 15 seconds, the third forging 50 can be held for a certain period of time after being formed, so that the shape of the third forging 50 remains stable and is finalized, and the first half die 11 and / or the second half die 14 are prevented from being instantly separated from the third forging 50, so that the third forging 50 is prevented from plastically deforming under the condition of unstable internal stress, so that the size of the third forging 50 does not meet the design requirements. By holding the third forging 50 and the punch 12 for 10 to 15 seconds, the yield rate can be improved.

[0058] In some embodiments, in the forming method of the seamless frame forging, the temperature of the ring blank 20, the first forging 30, and the second forging 40 is 850-1080°C; the temperature of the first half-die 11, the second half-die 14, the punch 12, and the support 15 is 150-450°C.

[0059] In this embodiment, the ring blank 20, the first forging 30 and the second forging 40 are heated to 850-1080° C.; it is ensured that the ring blank 20, the first forging 30 and the second forging 40 are deformed smoothly, and cracks will not be generated during the extrusion process due to the low temperature. In addition, the first half die 11, the second half die 14, the punch 12 and the support 15 are heated to 150-450° C., so that the first half die 11, the second half die 14, the punch 12 and the support 15 have a certain temperature, which can reduce the speed of heat transfer from the ring blank 20, the first forging 30 and the second forging 40 to the first half die 11, the second half die 14, the punch 12 and the support 15, so that the ring blank 20, the first forging 30 and the second forging 40 will not dissipate heat too quickly, thereby playing a certain heat preservation role.

[0060] In some embodiments, step S13 includes:

[0061] Step S131, based on the second forging 40, driving the first half-die 11 and / or the second half-die 14 to extrude the second forging 40 to a third forming state;

[0062] Step S132 , based on the third forming state, driving the die 13 to abut against one end surface of the second forging 40 to obtain a third forging 50 .

[0063] In this embodiment, the die 13 is driven to abut against the second forging 40, so that the die 13 forms an extrusion force on the second forging 40, so that when the first half die 11 and the second half die 14 extrudes the second forging 40, the second forging 40 can be shaped at the same time, so that the obtained third forging 50 is the desired seamless frame forging. And the die 13 is detachably connected to the hydraulic cylinder of the hydraulic press (not shown in the figure). In this embodiment, Figure 3 , Figure 4 As shown, the pressing die 13 includes a pressing portion 131, a closing portion 132, and a receiving hole 133; the pressing portion 131 is fixedly connected to the closing portion 132, and the receiving hole 133 runs through the pressing portion 131 and the closing portion 132. The pressing die 13 can be movably connected to the stamping portion 122 of the punch 12 through the receiving hole 133. The minimum length of the closing portion 132 is greater than the maximum length of the third forging 50, and the minimum width is greater than the maximum width of the third forging 50. The end surface shape of the pressing portion 131 away from the closing portion 132 is the same as the end surface shape of the third forging 50, and the pressing portion 131 gradually decreases from the cross section close to one end of the closing portion 132 to the cross section away from the closing portion 132, so that the pressing portion 131 can be spaced apart from the first half die 11 and the second half die 14 while shaping the second forging 40 to obtain the third forging 50, thereby ensuring that the pressing portion 131 is not squeezed and deformed by the first half die 11 and the second half die 14, thereby improving the forming efficiency of the third forging 50. In addition, the wall thickness of the die 13 is generally slightly larger than the wall thickness of the second forging 40. After the second forging 40 is horizontally extruded by the first half die 11, the second half die 14 and the punch 12, warping may occur in height. The die 13 is used to press down the end face of the second forging 40 to flatten it, eliminate the warping, and improve the flatness of the forging.

[0064] In some embodiments, the forming method of the seamless frame forging further includes step S14, based on the third forging 50, heat treating the third forging 50, wherein the insulation temperature of the heat treatment is 1138°C to 1193°C, and the insulation time is 60min to 66min.

[0065] In this embodiment, by heat treating the third forging 50, the residual stress inside the third forging 50 can be eliminated as much as possible, making the shape of the forging more regular, avoiding sudden deformation during use, and ensuring that the service life of the third forging 50 meets the design requirements.

[0066] This embodiment provides a forming system for a seamless frame forging, comprising:

[0067] The support 15, the first half-die 11, the second half-die 14, the punch 12, and the ring blank 20; the first half-die 11 and the second half-die 14 are respectively slidably connected to the same end surface of the support 15; the punch 12 is located between the first half-die 11 and the second half-die 14, and is spaced apart from the first half-die 11 and the second half-die 14; the first half-die 11, the second half-die 14, the support 15, and the punch 12 are surrounded to form an extrusion area; the end surface of the support 15 slidably connected to the first half-die 11 is concavely provided with an avoidance hole 152, and the avoidance hole 152 is spaced apart from the first half-die 11 and the second half-die 14; the punch 12 includes an entry portion 121 and a stamping portion 122, and the entry portion 121 is fixedly connected to the stamping portion 122; the cross section of the entry portion 121 gradually decreases from one end close to the stamping portion 122 to one end away from the stamping portion 122;

[0068] The forming system of the seamless frame forging includes a first working state, a second working state, and a third working state; the first working state includes that one end face of the ring blank 20 abuts against the end face of the support 15, the ring blank 20 is located between the first half-die 11 and the second half-die 14, and the first half-die 11 and / or the second half-die 14 are driven to extrude the ring blank 20 along the radial direction of the ring blank 20 to the first forming state; the second working state includes driving the punch 12 through the center hole of the first forging 30 to the second forming state; the third working state includes driving the first half-die 11 and / or the second half-die 14 to extrude the second forging 40 to the third forming state.

[0069] In this embodiment, the first forging 30 is formed by extruding the ring blank 20 by the first half die 11 and the second half die 14, so that a partial area of ​​the ring blank 20 is subjected to a compression process, and then the punch 12 abuts against the first forging 30, so that a partial area of ​​the first forging 30 is subjected to a tension process, thereby obtaining a second forging 40, and then the second forging 40 is extruded by the first half die 11 and the second half die 14, so that a partial area of ​​the second forging 40 is subjected to a compression process, thereby obtaining a third forging 50, which can make a partial area of ​​the seamless frame forging first subjected to compression, then tension, and then compression, forming a forging process, so that the seamless frame forging has a forged area, and then the strength of the forging is increased during the forging process, thereby solving the problem in the prior art that the seamless frame forging is obtained by extruding the ring blank 20 once, which is prone to excessive local stress and ultimately leads to insufficient strength of the forging. Furthermore, by the two-step extrusion forging method of the first half die 11 and the second half die 14, a gap can be left between the first half die 11 and the second half die 14 before the punch 12 punches the first forging 30, which can avoid excessive concentration of internal stress of the first forging 30 during the punching process of the punch 12, thereby reducing the occurrence of irregular deformation caused by excessive stress concentration on the outer surface of the first forging 30 during the punching process of the first forging 30 by the punch 12. This causes a large fold in the first forging 30, making the third forging 50 after forming discontinuous at a large bending position. By extruding the ring blank 20 by the first half die 11 and the second half die 14 until a gap is left, when the punch 12 extrudes the first forging 30, there is space for the first forging 30 to deform in all directions, which is conducive to the first forging 30 being attached to the first half die 11 and the second half die 14.

[0070] In some embodiments, Figure 3 , Figure 4 As shown, the system also includes a die 13, which includes a clamping portion 131, a closing portion 132, and a receiving hole 133; the clamping portion 131 is fixedly connected to the closing portion 132, and the receiving hole 133 runs through the clamping portion 131 and the closing portion 132. The die 13 can be movably connected to the stamping portion 122 of the punch 12 through the receiving hole 133. The minimum length of the closing portion 132 is greater than the maximum length of the third forging 50, and the minimum width is greater than the maximum width of the third forging 50. The end face shape of the clamping portion 131 away from the closing portion 132 is the same as the end face shape of the third forging 50, and the clamping portion 131 gradually decreases from the cross section close to one end of the closing portion 132 to the cross section away from the closing portion 132.

[0071] In this embodiment, the pressing part 131 can be spaced apart from the first half die 11 and the second half die 14 while shaping the second forging 40 to obtain the third forging 50, so as to ensure that the pressing part 131 is not deformed by the first half die 11 and the second half die 14, thereby improving the forming efficiency of the third forging 50. In addition, the wall thickness of the die 13 is generally slightly greater than the wall thickness of the second forging 40. After the second forging 40 is formed by horizontal extrusion by the first half die 11, the second half die 14 and the punch 12, the height may be warped. The die 13 presses down the end surface of the second forging 40 to flatten it, eliminate the warping, and improve the flatness of the forging.

[0072] In the above, the material of the ring blank 20 can be selected from high temperature alloy materials, steel forgings, easily deformed high temperature alloys, titanium alloys, aluminum alloys and other materials.

[0073] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A method for forming a seamless frame forging, characterized in that: The following steps are involved: Step S11, based on the abutment between the ring blank and the support, driving the first half-die and / or the second half-die to extrude the ring blank in the radial direction of the ring blank to a first forming state to obtain a first forging; wherein the first forming state includes that the minimum distance between the first half-die and the second half-die is a first set value; Step S12, based on the first forging, driving a punch through the center hole of the first forging to a second forming state, to obtain a second forging; wherein the second forming state includes the entry portion of the punch being inserted into the avoidance hole of the support, and the punching portion of the punch being in contact with the first forging; Step S13, based on the second forging, driving the first half-die and / or the second half-die to extrude the second forging to a third forming state to obtain a third forging; wherein the third forming state includes that the minimum distance between the first half-die and the second half-die is a second set value; The step S13 comprises: Step S131, based on the second forging, driving the first half-die and / or the second half-die to extrude the second forging to a third forming state; Step S132, based on the third forming state, driving the die to abut against one end surface of the second forging to obtain a third forging; In step S13, the third forming state includes an inner surface of the third forging having an interference fit with the punch, a portion of the outer surface of the third forging having an interference fit with the first half mold, and a portion of the outer surface having an interference fit with the second half mold; The first forging is formed by extruding the ring blank through the first half-die and the second half-die, so that a partial area of ​​the ring blank is subjected to a compression process, and then the punch abuts against the first forging, so that a partial area of ​​the first forging is subjected to a tension process, thereby obtaining the second forging, and then the second forging is extruded through the first half-die and the second half-die again, so that a partial area of ​​the second forging is subjected to a compression process, thereby obtaining the third forging.

2. A method for forming a seamless frame forging according to claim 1, characterized in that: In the step S11, the first set value is K, K=(0.029-0.048)×L; wherein L is the outer diameter circumference of the ring blank.

3. The method for forming a seamless frame forging according to claim 1, characterized in that: In the step S11, the force of the first half mold and / or the second half mold to squeeze the ring blank in the radial direction of the ring blank is 3.6-5.6 MPa.

4. A method for forming a seamless frame forging according to claim 1, characterized in that: In the step S13, the force of the first half-die and / or the second half-die to extrude the second forging is 4.2-6.6 MPa.

5. The method for forming a seamless frame forging according to claim 1, characterized in that: In the step S13, the third forging and the punch are kept under pressure for 10 to 15 seconds.

6. A method for forming a seamless frame forging according to claim 1, characterized in that: In the forming method of the seamless frame forging, the temperature of the ring blank, the first forging, and the second forging is 850-1080°C; the temperature of the first half die, the second half die, the punch, and the support is 150-450°C.

7. A method for forming a seamless frame forging according to claim 1, characterized in that: The forming method of the seamless frame forging also includes step S14, based on the third forging, heat treating the third forging, wherein the heat treatment has a holding temperature of 1138° C. to 1193° C. and a holding time of 60 min to 66 min.

8. A forming system for a seamless frame forging, applied to a forming method for a seamless frame forging as claimed in any one of claims 1 to 7, characterized in that: include: The support, the first half-die, the second half-die, the punch, and the ring blank; The first half mold and the second half mold are respectively connected to the same end surface of the support in a sliding manner; the punch is located between the first half mold and the second half mold, and is spaced apart from the first half mold and the second half mold; the first half mold, the second half mold, the support, and the punch together form an extrusion area; the end surface of the support connected to the first half mold in a sliding manner is concavely provided with an avoidance hole, and the avoidance hole is spaced apart from the first half mold and the second half mold; the punch includes an entry portion and a stamping portion, the entry portion is fixedly connected to the stamping portion; the cross section of the entry portion gradually decreases from one end close to the stamping portion to one end away from the stamping portion; The forming system of the seamless frame forging includes a first working state, a second working state, and a third working state; the first working state includes that one end face of the ring blank abuts against the end face of the support, the ring blank is located between the first half-die and the second half-die, and the first half-die and / or the second half-die are driven to extrude the ring blank along the radial direction of the ring blank to the first forming state; the second working state includes driving the punch through the center hole of the first forging to the second forming state; the third working state includes driving the first half-die and / or the second half-die to extrude the second forging to the third forming state.

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