A forming die for a slingshot cross-section ring forging

Abstract

The utility model relates to the field of forging forming, concretely relates to a slingshot cross section annular forge piece forming die, including positioning sleeve ring, inner mould, outer mould and press ring, the inner mould and outer mould all set up on positioning sleeve ring, positioning sleeve ring is used for limiting the horizontal displacement of inner mould and outer mould, and positioning sleeve ring, inner mould, outer mould and press ring form the forming cavity that adapts with workpiece cross section shape and enclose, the utility model relates to a slingshot cross section annular forge piece forming die, through the cooperation of positioning sleeve ring (reference position) + inner mould (inner profile control) + outer mould (outer profile constraint) + press ring (material flow guide), realize high accuracy, stable, efficient forming of slingshot cross section annular forge piece, solve the problem of uneven size caused by mould alignment deviation in traditional tire mould forming.

Description

Technical Field

[0001] This utility model relates to the field of forging and forming, and in particular to a slingshot-shaped cross-section annular forging mold. Background Technology

[0002] The product structure is a slingshot-shaped cross-section ring forging, i.e., a Y-shaped ring forging, such as... Figure 1 As shown, the upper part of the cross-section of workpiece 1 is open, which means it cannot be rolled into shape. Therefore, the forming method requires the use of a die. In die forming, since the shape of workpiece 1 is slingshot-shaped and its two sides are symmetrical, the outer mold is used to control the outer shape of workpiece 1, and the inner mold is used to control the inner shape of workpiece 1. That is, the inner mold and the outer mold are placed on the anvil surface of the equipment and then the end face is pressed down. Since the inner and outer molds may have positional deviations before being placed, the gap between them is uneven, which affects the forming quality of the slingshot-shaped cross-section ring forging.

[0003] Therefore, a technical solution is needed to address the problem that when forming a slingshot-shaped cross-section ring forging, it is necessary to pre-install inner and outer molds. When there is a positional deviation between the inner and outer molds, the gap between them may be uneven, affecting the forming quality. Utility Model Content

[0004] The purpose of this invention is to overcome the technical problem in the prior art that when forming a slingshot-shaped cross-section annular forging, it is necessary to pre-install inner and outer molds. When there is a positional deviation between the inner and outer molds, the gap between them may be uneven, affecting the forming quality. This invention provides a slingshot-shaped cross-section annular forging forming mold.

[0005] This utility model provides a slingshot-shaped cross-section annular forging mold, including a positioning collar, an inner mold, an outer mold, and a pressure ring, wherein the inner mold and the outer mold are both disposed on the positioning collar;

[0006] Inner mold: The upper part of the outer wall of the inner mold is provided with a first forming surface that matches the shape of the upper inner wall of the workpiece;

[0007] Outer mold: The outer mold is arranged around the inner mold, and the upper part of the inner wall of the outer mold is provided with a second forming surface that matches the shape of the upper outer wall of the workpiece;

[0008] Pressure ring: The pressure ring is disposed between the first forming surface and the second forming surface, and the bottom of the pressure ring is adapted to the shape of the groove at the top of the workpiece;

[0009] Positioning collar: The positioning collar is used to limit the horizontal displacement of the inner mold and the outer mold. The positioning collar, inner mold, outer mold and pressure ring are gathered to form a forming cavity that is adapted to the cross-sectional shape of the workpiece.

[0010] This utility model discloses a slingshot-shaped cross-section annular forging mold. In use, the first forming surface of the outer wall of the inner mold directly contacts the upper inner wall of the forging, determining the inner shape of the slingshot-shaped opening. The second forming surface of the inner wall of the outer mold fits against the upper outer wall of the forging, controlling the outer shape of the slingshot-shaped cross-section. The shape of the pressure ring matches the top groove of the forging. When pressed down, it guides the material to flow to both sides, forming a slingshot-shaped opening structure. This utility model achieves high-precision, stable, and efficient forming of slingshot-shaped cross-section annular forgings through the synergistic effect of the positioning ring (base positioning), inner mold (inner contour control), outer mold (outer contour constraint), and pressure ring (material flow guidance), solving the problem of uneven dimensions caused by mold alignment deviation in traditional mold forming.

[0011] Preferably, the positioning collar has a positioning hole in the middle, and the bottom of the inner mold has a boss that matches the positioning hole.

[0012] In use, the boss of the inner mold is inserted into the positioning hole of the positioning collar, thereby achieving the horizontal positioning of the inner mold on the positioning collar.

[0013] Preferably, the positioning hole opening is provided with a guide slope.

[0014] The guide bevel serves as a guide for the installation of the inner mold, making it easier for the inner mold's boss to be embedded into the positioning hole, thus simplifying the installation and positioning of the inner mold.

[0015] Preferably, the height of the boss is a, the depth of the positioning hole is b, and 1mm ≤ ba.

[0016] ba is the difference between the height of the boss and the depth of the positioning hole. ba≥1mm ensures that after the inner mold is installed on the positioning collar, the bottom of the boss and the lower anvil surface of the equipment maintain a gap of at least 1mm. This avoids the problem of the inner mold being suspended due to manufacturing errors, where the ground of the inner mold cannot contact the top surface of the positioning collar.

[0017] Preferably, a ≥ 10 mm.

[0018] That is, the boss can be embedded in the positioning hole to a depth of at least 10mm to ensure the stability of the inner mold position, while reserving space for the setting of the guide slope.

[0019] Preferably, the upper end face of the positioning collar is provided with an annular limiting edge, and the outer diameter of the outer mold is adapted to the inner diameter of the annular limiting edge.

[0020] In use, the outer mold is embedded in the circular limiting edge, thereby achieving horizontal limiting of the outer mold on the positioning collar.

[0021] Preferably, the height c of the annular limiting edge is 5mm ≤ c ≤ 30mm.

[0022] This ensures that the outer mold has a limiting depth of at least 5mm on the positioning collar to ensure the stability of the outer mold position, while the limiting depth does not exceed 30mm to facilitate the installation and removal of the outer mold on the positioning collar later.

[0023] Preferably, it further includes an adjustment ring, wherein the middle part of the cross section of the adjustment ring is provided with a groove adapted to the width of the blank cross section, the inner side of the adjustment ring is provided with a first conforming surface that can fit with the first forming surface, and the outer side of the adjustment ring is provided with a second conforming surface that can fit with the second forming surface.

[0024] The symmetry of the slingshot-shaped cross section is highly dependent on the initial centering. The temporary positioning function of the adjusting ring solves the problem of relying on the operator's experience in traditional die forming. Its core function is to accurately calibrate the position of the blank before the pressure ring is pressed down, so as to ensure the symmetry and dimensional accuracy of the slingshot-shaped cross section ring forging. The groove in the middle of the adjusting ring fits tightly with the upper section of the blank. The inner first conforming surface fits the first forming surface of the inner mold, and the outer second conforming surface fits the second forming surface of the outer mold, so that the blank is automatically centered when it is placed between the inner mold and the outer mold, eliminating the radial deviation caused by manual placement.

[0025] Preferably, the depth of the slot is C, the height of the inner mold is h, the height of the blank is H, and 3mm≤C-(Hh)≤20mm.

[0026] Hh represents the height of the blank protruding from the top surface of the inner mold. Therefore, the depth of the slot needs to be greater than this height to ensure that the adjusting ring can enter the gap between the inner and outer molds. C-(Hh) represents the depth to which the adjusting ring can enter the gap. This dimension should be controlled above 3mm so that the adjusting ring enters the gap with a significant drop, reducing misoperation. At the same time, this dimension should be controlled within 20mm to avoid the adjusting ring falling too deep into the gap and becoming difficult to remove, and also to avoid the difficulty in operation caused by the overall thickness of the adjusting ring being too large.

[0027] Preferably, the adjusting ring is provided with a handle at the top.

[0028] It facilitates the insertion, removal, and movement of the adjustment ring via the handle.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] This utility model provides a slingshot-shaped cross-section ring forging die. Through the synergistic effect of positioning ring (base positioning), inner mold (inner contour control), outer mold (outer contour constraint), and pressure ring (material flow guidance), it achieves high-precision, stable, and efficient forming of slingshot-shaped cross-section ring forging, and solves the problem of uneven size caused by mold alignment deviation in traditional die forming. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the cross-section of a slingshot-shaped annular forging;

[0032] Figure 2 This is a cross-sectional schematic diagram of the usage state (pressure ring pressing stage) of a slingshot-shaped cross-section annular forging mold of this utility model;

[0033] Figure 3 This is a cross-sectional schematic diagram of the positioning collar described in this utility model;

[0034] Figure 4 This is a cross-sectional schematic diagram of the inner mold described in this utility model;

[0035] Figure 5 This is a cross-sectional schematic diagram of the outer mold described in this utility model;

[0036] Figure 6 This is a cross-sectional schematic diagram of the usage state (initial adjustment stage) of a slingshot-shaped cross-section annular forging mold of this utility model;

[0037] Figure 7 This is a cross-sectional schematic diagram of the usage state (positioning end stage) of a slingshot-shaped cross-section annular forging mold of this utility model;

[0038] Figure 8 This is a cross-sectional schematic diagram of the adjusting ring described in this utility model;

[0039] Marked in the image:

[0040] 1-Workpiece, 2-Equipment lower anvil surface, 3-Equipment upper anvil surface, 4-Positioning collar, 41-Positioning hole, 42-Circular limiting edge, 43-Guide inclined surface, 5-Inner mold, 51-Boss, 52-First forming surface, 6-Outer mold, 61-Second forming surface, 7-Adjusting ring, 71-Slot, 72-First conforming surface, 73-Second conforming surface, 74-Handle, 8-Pressure ring. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0042] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0044] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0045] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0046] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0047] Example 1

[0048] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a slingshot-shaped cross-section annular forging die includes a positioning collar 4, an inner mold 5, an outer mold 6, and a pressure ring 8, wherein the inner mold 5 and the outer mold 6 are both disposed on the positioning collar 4;

[0049] Inner mold 5: The upper part of the outer wall of the inner mold 5 is provided with a first forming surface 52 that is adapted to the shape of the upper inner wall of the workpiece 1;

[0050] Outer mold 6: The outer mold 6 is arranged around the inner mold 5, and the upper part of the inner wall of the outer mold 6 is provided with a second forming surface 61 that is adapted to the shape of the upper outer wall of the workpiece 1;

[0051] Pressure ring 8: The pressure ring 8 is disposed between the first forming surface 52 and the second forming surface 61, and the bottom of the pressure ring 8 is adapted to the shape of the top groove of the workpiece 1;

[0052] Positioning collar 4: The positioning collar 4 is used to limit the horizontal displacement of the inner mold 5 and the outer mold 6. The positioning collar 4, the inner mold 5, the outer mold 6 and the pressure ring 8 form a forming cavity that is adapted to the cross-sectional shape of the workpiece 1.

[0053] In use, the first forming surface 52 of the outer wall of the inner mold 5 directly contacts the upper inner wall of the forging, determining the inner shape of the slingshot-shaped opening. The second forming surface 61 of the inner wall of the outer mold 6 fits against the upper outer wall of the forging, controlling the outer shape of the slingshot-shaped cross section. The shape of the pressure ring 8 matches the top groove of the forging. When pressed down, it guides the material to flow to both sides, forming a slingshot-shaped opening structure. This utility model achieves high-precision, stable, and efficient forming of slingshot-shaped cross section annular forgings through the synergistic effect of the positioning collar 4 (baseline positioning), the inner mold 5 (inner contour control), the outer mold 6 (outer contour constraint), and the pressure ring 8 (material flow guidance). It solves the problem of uneven dimensions caused by mold alignment deviation in traditional mold forming.

[0054] In one or more embodiments, the positioning collar 4 may be provided with a positioning hole 41 and an annular limiting edge 42.

[0055] Positioning hole 41: It is set in the middle of the positioning collar 4, and a boss 51 that matches the positioning hole 41 is provided at the bottom of the inner mold 5.

[0056] Circular limiting edge 42: evenly arranged around the edge of the positioning collar 4, the outer diameter of the outer mold 6 is adapted to the inner diameter of the circular limiting edge 42.

[0057] In an optional embodiment, the positioning hole 41 is provided with a guide slope 43.

[0058] The guide slope 43 guides the installation of the inner mold 5, making it easier for the boss 51 of the inner mold 5 to be embedded in the positioning hole 41, thus making the installation and positioning of the inner mold 5 simpler.

[0059] In an optional embodiment, the height of the boss 51 is a, the depth of the positioning hole 41 is b, 1mm≤ba, and a≥10mm.

[0060] ba is the difference between the height of the boss 51 and the depth of the positioning hole 41. ba≥1mm ensures that after the inner mold 5 is installed on the positioning collar 4, the bottom of the boss 51 and the lower anvil surface 2 of the equipment maintain a gap of at least 1mm. This avoids the problem of the inner mold 5 being suspended due to manufacturing errors, where the ground of the inner mold 5 cannot contact the top surface of the positioning collar 4. At the same time, the boss 51 can be embedded in the positioning hole 41 to a depth of at least 10mm to ensure the stability of the inner mold 5's position and to reserve space for the setting of the guide slope 43.

[0061] In an optional implementation, the height c of the annular limiting edge is 5mm ≤ c ≤ 30mm.

[0062] This ensures that the outer mold 6 has a limiting depth of at least 5mm on the positioning collar 4 to ensure the stability of the outer mold 6, while the limiting depth does not exceed 30mm, so as to facilitate the installation and removal of the outer mold 6 on the positioning collar 4 in the later stage.

[0063] Example 2

[0064] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that it also includes an adjustment ring 7. The adjustment ring 7 has a groove 71 in the middle of its cross section that is adapted to the width of the blank cross section. The inner side of the adjustment ring 7 has a first conforming surface 72 that can fit with the first forming surface 52. The outer side of the adjustment ring 7 has a second conforming surface 73 that can fit with the second forming surface 61.

[0065] The symmetry of the slingshot-shaped cross section is highly dependent on the initial centering. In this embodiment, the temporary positioning function of the adjusting ring 7 solves the problem of relying on the operator's experience in the traditional mold forming process. Its core function is to accurately calibrate the position of the blank before the pressure ring 8 is pressed down, so as to ensure the symmetry and dimensional accuracy of the slingshot-shaped cross section annular forging. The slot 71 in the middle of the adjusting ring 7 fits tightly with the upper section of the blank. The inner first conforming surface 72 fits the first forming surface 52 of the inner mold 5, and the outer second conforming surface 73 fits the second forming surface 61 of the outer mold 6, so that the blank is automatically centered when it is placed between the inner mold 5 and the outer mold 6, eliminating the radial deviation caused by manual placement.

[0066] In an optional embodiment, the depth of the slot 71 is C, the height of the inner mold 5 is h, the height of the blank is H, and 3mm≤C-(Hh)≤20mm.

[0067] Where Hh represents the height of the blank protruding from the top surface of the inner mold 5, the depth of the slot 71 needs to be greater than this height to ensure that the adjusting ring 7 can enter the gap between the inner mold 5 and the outer mold 6. C-(Hh) represents the depth to which the adjusting ring 7 can enter the gap. By controlling this dimension to be above 3mm, the adjusting ring 7 enters the gap with a significant drop, reducing misoperation. At the same time, by controlling this dimension to be within 20mm, on the one hand, it avoids the adjusting ring falling too deep into the gap, making it difficult to remove, and on the other hand, it also avoids the problem of difficult operation caused by the overall thickness of the adjusting ring 7 being too large.

[0068] In an optional embodiment, the top of the adjustment ring 7 is provided with a handle 74, which facilitates the insertion, removal and movement of the adjustment ring 7.

[0069] The steps for processing a slingshot-shaped ring forging using the forming mold of this embodiment are as follows:

[0070] S1. Blanking: Determine the initial blank size of the forging to ensure sufficient material for subsequent upsetting, punching and other processes, avoid forming defects due to insufficient material, match the blank size with the volume of workpiece 1, reduce material waste. The blank size is Φ250mm×295±3mm, the blank weight is 120Kg, and the end face chamfer is R10mm-R20mm.

[0071] S2. Heating: After feeding, the billet is heated using a box-type resistance furnace. The heating temperature is 1000℃-1060℃, and the holding time is 150min-300min.

[0072] S3, Upsetting: The upsetting height is based on the height of the pre-rolled billet plus 3mm-6mm. The purpose of increasing the height is to balance the material pulling situation in the punching step. The upsetting height is 185±5mm and the outer diameter is Φ320±10mm.

[0073] S4. Punching: A through hole is formed in the center of the billet to provide a mandrel positioning reference for subsequent rolling or bulging, and to avoid uneven wall thickness caused by eccentricity in subsequent processes. The punch is determined according to the outer diameter of the billet after upsetting. The diameter of the punch is between 1 / 3 and 1 / 2 of the outer diameter of the upsetting billet. In this embodiment, the diameter of the punch is Φ140±10mm.

[0074] S5. Heating: Use a box-type resistance furnace to heat the forgings at a temperature of 1000℃~1060℃ and a holding time of 50min~200min.

[0075] S6. Pre-rolling: The billet diameter is increased by using mandrel rolling. The pre-rolling step before the die is formed allows for more precise control of the billet diameter and wall thickness when entering step 4, which is beneficial for precise forming and reduces the amount of machining in the later stage.

[0076] S7. Heating: After pre-rolling, the billet is heated to prepare for expansion. A box-type resistance furnace is used to heat the billet at a temperature of 980℃~1020℃ and a holding time of 40min~190min.

[0077] S8. Bulging: Using hydraulic or mechanical force to radially expand the material within a closed mold. Due to various factors such as equipment deviation and personnel operation during the rolling process, the tolerance of the rolled product can be relatively large, which can generally be controlled within ±5mm. However, for the subsequent forming process of this solution, the billet needs to be placed in a forming mold with a positioning collar 4, which requires higher control over the billet size. With bulging, the deformation area is concentrated inside the mold, and the mold itself has a high-precision profile. The material is forced to fit the mold to form, so the size is closer to the mold design value, and the tolerance can be controlled within ±1mm.

[0078] S9. Machining: A limiting groove is machined on the upper end face of the billet by mechanical processing. The limiting groove plays a limiting role for the pressure ring 8, preventing the pressure ring 8 from slipping during the pressing process, making it easier for the billet to form an accurate slingshot shape.

[0079] S10. Heating: After machining, the billet is heated to prepare for forming. A box-type resistance furnace is used to heat the billet at a temperature of 980℃~1020℃ and a holding time of 40min~190min.

[0080] S11. Tooling configuration: A positioning collar 4 is provided on the lower anvil surface 2 of the equipment. The positioning collar 4 has a positioning hole 41 in the middle and a circular limiting edge 42 on the upper end face of the positioning collar 4. An inner mold 5 and an outer mold 6 are placed on the positioning collar 4 in sequence. The bottom of the inner mold 5 has a boss 51 that matches the positioning hole 41. The boss 51 is embedded in the positioning hole 41. The upper part of the outer wall of the inner mold 5 has a first forming surface 52 that matches the shape of the upper inner wall of the workpiece 1. The outer mold 6 is arranged around the inner mold 5. The outer diameter of the outer mold 6 matches the inner diameter of the circular limiting edge 42. The upper part of the inner wall of the outer mold 6 has a second forming surface 61 that matches the shape of the upper outer wall of the workpiece 1.

[0081] S12. Positioning: The blank is placed between the outer mold 6 and the inner mold 5. An adjustment ring 7 is set at the upper end of the blank. The middle of the cross-section of the adjustment ring 7 has a groove 71 that matches the width of the blank cross-section. The inner side of the adjustment ring 7 has a first conforming surface 72 that can fit with the first forming surface 52. The outer side of the adjustment ring 7 has a second conforming surface 73 that can fit with the second forming surface 61. The blank is moved by the adjustment ring 7 so that the adjustment ring 7 is inserted into the gap between the inner mold 5 and the outer mold 6. Then the adjustment ring 7 is removed. The symmetry of the spring-shaped cross-section is highly dependent on the initial... The initial centering function of the positioning ring 7 solves the problem of relying on the operator's experience in traditional mold forming. Its core function is to accurately calibrate the position of the blank before the pressure ring 8 is pressed down, ensuring the symmetry and dimensional accuracy of the spring-shaped cross-section ring forging. The groove 71 in the middle of the positioning ring 7 fits tightly with the upper section of the blank. The inner first conforming surface 72 fits the first forming surface 52 of the inner mold 5, and the outer second conforming surface 73 fits the second forming surface 61 of the outer mold 6, so that the blank is automatically centered when placed between the inner mold 5 and the outer mold 6, eliminating the radial deviation caused by manual placement.

[0082] S13. Forming: Place a pressure ring 8 on the upper end face of the blank. The pressure ring 8 is adapted to the shape of the top groove of the workpiece 1. Press the pressure ring 8 down through the anvil surface 3 on the equipment until the anvil surface 3 on the equipment abuts against the top surface of the inner mold 5.

[0083] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A slingshot-shaped cross-section annular forging die, characterized in that, It includes a positioning collar (4), an inner mold (5), an outer mold (6) and a pressure ring (8), wherein the inner mold (5) and the outer mold (6) are both disposed on the positioning collar (4); Inner mold (5): The upper part of the outer wall of the inner mold (5) is provided with a first forming surface (52) that is adapted to the shape of the upper inner wall of the workpiece (1); Outer mold (6): The outer mold (6) is arranged around the inner mold (5), and the upper part of the inner wall of the outer mold (6) is provided with a second forming surface (61) that is adapted to the shape of the upper outer wall of the workpiece (1). Pressure ring (8): The pressure ring (8) is disposed between the first forming surface (52) and the second forming surface (61), and the bottom of the pressure ring (8) is adapted to the top groove shape of the workpiece (1); Positioning collar (4): The positioning collar (4) is used to limit the horizontal displacement of the inner mold (5) and the outer mold (6). The positioning collar (4), the inner mold (5), the outer mold (6) and the pressure ring (8) surround and form a forming cavity that is adapted to the cross-sectional shape of the workpiece (1).

2. The slingshot-shaped cross-section annular forging die according to claim 1, characterized in that, The positioning collar (4) has a positioning hole (41) in the middle, and the bottom of the inner mold (5) has a boss (51) that matches the positioning hole (41).

3. The slingshot-shaped cross-section annular forging die according to claim 2, characterized in that, The positioning hole (41) is provided with a guide slope (43).

4. The slingshot-shaped cross-section annular forging die according to claim 2, characterized in that, The height of the boss (51) is a, and the depth of the positioning hole (41) is b, 1mm≤ba.

5. The slingshot-shaped cross-section annular forging die according to claim 4, characterized in that, a≥10mm.

6. The slingshot-shaped cross-section annular forging die according to claim 1, characterized in that, The upper end face of the positioning collar (4) is provided with a circular limiting edge (42), and the outer diameter of the outer mold (6) is adapted to the inner diameter of the circular limiting edge (42).

7. The slingshot-shaped cross-section annular forging die according to claim 6, characterized in that, The height c of the annular limiting edge is 5mm ≤ c ≤ 30mm.

8. A slingshot-shaped cross-section annular forging die according to any one of claims 1-7, characterized in that, It also includes a positioning ring (7), the positioning ring (7) has a groove (71) in the middle of its cross section that is adapted to the width of the blank cross section, the inner side of the positioning ring (7) has a first conforming surface (72) that can fit with the first forming surface (52), and the outer side of the positioning ring (7) has a second conforming surface (73) that can fit with the second forming surface (61).

9. A slingshot-shaped cross-section annular forging die according to claim 8, characterized in that, The depth of the slot (71) is C, the height of the inner mold (5) is h, the height of the blank is H, and 3mm≤C-(Hh)≤20mm.

10. A slingshot-shaped cross-section annular forging die according to claim 8, characterized in that, The top of the adjustment ring (7) is provided with a handle (74).

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