A forming tool and forming method for mounting a rim

Abstract

The application belongs to the field of manufacturing of aero-engine frame structure, and particularly relates to a forming tool and forming method for a mounting edge. The forming tool comprises a main cylinder mold, a right cylinder mold, a left cylinder mold, a bottom cylinder mold and a positioning block. The main cylinder mold, the right cylinder mold, the left cylinder mold and the bottom cylinder mold are combined to form an extrusion space. The positioning block is located in the extrusion space and is used for positioning a ring blank in the extrusion space. A covering part is arranged on the main cylinder mold, the left cylinder mold, the right cylinder mold and / or the bottom cylinder mold. The extrusion end face of the main cylinder mold, the extrusion end face of the left cylinder mold, the extrusion end face of the right cylinder mold, the extrusion end face of the bottom cylinder mold and the limiting surface can form a closed space. The ring blank is filled into the closed space during extrusion, so that the problem that the stress of the ring-shaped part at the corner is too concentrated after being extruded and the inner surface of the ring-shaped part at the corner is prone to cracks in the manufacturing process of the mounting edge is solved.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine frame structure manufacturing, specifically relating to a forming tooling and forming method for an mounting edge. Background Technology

[0002] Mounting edge is a common part on aero engines. It is a fan-shaped multi-sided mounting edge structure. Because the mounting edge structure is mostly irregular, it is very difficult to form, requires many steps, has a long forming cycle, and is complicated to operate, resulting in high production cost and low production efficiency.

[0003] Currently, the production process for mounting edges generally requires upsetting and punching the bar, rolling it into a ring billet, further extruding the ring billet to obtain a preliminary forging, and then shaping the preliminary forging to finally obtain the required mounting edge.

[0004] A Chinese patent discloses a method for forming an mounting edge, specifically disclosing that during the process of pressing a circular component radially to bend it into a rectangular component, the outer sides of the rectangular components between adjacent punches will slightly protrude to form corners. While this method can quickly produce rectangular components by rapidly extruding the circular component with punches, it suffers from a drawback: during the process of extruding the circular component into a rectangular component, the circular components between adjacent punches are compressed and bulge outwards, forming corners. This process can easily lead to excessive stress concentration on the inner surface of the circular component at the corners, causing the circular component at the corners to deform rapidly and crack. Summary of the Invention

[0005] To address the problem that excessive stress concentration at the corner of the annular component during existing mounting edge manufacturing processes can easily lead to cracks on the inner surface of the annular component, this invention provides a forming fixture and forming method for mounting edges:

[0006] Firstly, this embodiment provides a forming fixture for an mounting edge, comprising:

[0007] The system includes a main cylinder mold, a right cylinder mold, a left cylinder mold, a bottom cylinder mold, and a positioning block. The main cylinder mold, right cylinder mold, left cylinder mold, and bottom cylinder mold together form an extrusion space. The positioning block is located within the extrusion space and is used to position the ring blank within the extrusion space. The side ends of the extrusion end face of the main cylinder mold, and / or the side ends of the extrusion end face of the left cylinder mold, and / or the side ends of the extrusion end face of the right cylinder mold, and / or the side ends of the extrusion end face of the bottom cylinder mold protrude outward to form a edging portion. The edging portion forms a limiting surface facing the side where the extrusion space is located. The limiting surface is a first concave curved surface.

[0008] The extrusion end face of the main cylinder mold, the extrusion end face of the left cylinder mold, the extrusion end face of the right cylinder mold, the extrusion end face of the bottom cylinder mold, and the limiting surface can be combined to form a closed space.

[0009] In some embodiments, the bottom cylinder mold is provided with a first extrusion end face, which is a second concave curved surface; the positioning block is used to position the ring blank on the first extrusion end face.

[0010] In some embodiments, the left cylinder mold is provided with a third extrusion end face, and the right cylinder mold is provided with a fourth extrusion end face; the side end of the third extrusion end face on the left cylinder mold extends outward to form a edging portion; the side end of the fourth extrusion end face on the right cylinder mold extends outward to form a edging portion; the limiting surface of the edging portion on the left cylinder mold is smoothly transitioned and integrally formed with the third extrusion end face; the limiting surface of the edging portion on the right cylinder mold is smoothly transitioned and integrally formed with the fourth extrusion end face.

[0011] In some embodiments, the main cylinder mold is provided with a second extrusion end face, and the side end of the main cylinder mold of the second extrusion end face and the side end of the bottom cylinder mold of the first extrusion end face are both provided with grooves, and the edge end face can be fitted and connected with the grooves.

[0012] Secondly, this embodiment provides a method for forming an mounting edge, which is applied to a forming fixture for an mounting edge as described in the first aspect, and includes the following steps:

[0013] S11: Adjust the positions of the main cylinder mold, left cylinder mold, right cylinder mold, and bottom cylinder mold to form an extrusion space;

[0014] S12: Place the ring blank in the extrusion space and fix the ring blank on the first extrusion end face of the bottom cylinder mold with positioning blocks;

[0015] S13: Push the main cylinder mold, left cylinder mold, and right cylinder mold to move close to the ring blank along the radial direction of the ring blank, and squeeze the ring blank until the main cylinder mold, left cylinder mold, right cylinder mold, bottom cylinder mold, and edge portion form a closed space and are interference fit with the ring blank to obtain the first forging;

[0016] S14: Push the main cylinder mold, left cylinder mold, and right cylinder mold away from the first forging until the main cylinder mold, left cylinder mold, right cylinder mold, and the edge portion are no longer in contact with the first forging, and remove the first forging.

[0017] In some embodiments, the main cylinder mold is first pushed to approach the ring blank along the radial direction of the ring blank, squeezing the ring blank until a portion of the inner surface of the ring blank abuts against the positioning block. Then, the right cylinder mold and the left cylinder mold are pushed to approach the ring blank at the same speed along the radial direction of the ring blank, and simultaneously squeezing the ring blank until the limiting surface on the edge portion forms a closed space with the first extrusion surface of the bottom cylinder mold, the second extrusion surface of the main cylinder mold, the third extrusion surface of the right cylinder mold, and the fourth extrusion surface of the left cylinder mold. The limiting surface, the first extrusion surface, the second extrusion surface, the third extrusion surface, and the fourth extrusion surface are interference-fitted with the ring blank to obtain the first forging.

[0018] The edge-sealing portion is provided on the left cylinder mold and the right cylinder mold.

[0019] In some embodiments, the movement speed of the main cylinder mold, left cylinder mold, and right cylinder mold when extruding the ring blank is 5 to 10 mm / s.

[0020] In some embodiments, the first forging is interference-fitted with the main cylinder mold, the left cylinder mold, the right cylinder mold, the bottom cylinder mold, and the edge portion for 5-10 seconds.

[0021] In some embodiments, the main cylinder mold is pushed away from the first forging until the main cylinder mold disengages from the first forging. Then, the left cylinder mold and the right cylinder mold are pushed away from the first forging until the left cylinder mold, the right cylinder mold, and the edge portion disengage from the first forging. Then, the first forging is removed.

[0022] In some embodiments, the speed at which the main cylinder mold, the left cylinder mold, and the right cylinder mold move away from the first forging is 5 to 10 mm / s.

[0023] To address the problem that excessive stress concentration at the corner of the annular component during the existing mounting edge manufacturing process easily leads to cracks on the inner surface of the annular component at that location, this invention offers the following advantages:

[0024] By forming an outwardly protruding edge portion on the side end of the extrusion end face of the main cylinder mold, and / or the side end of the extrusion end face of the left cylinder mold, and / or the side end of the extrusion end face of the right cylinder mold, and / or the side end of the extrusion end face of the bottom cylinder mold, a limiting surface is formed on the side of the extrusion space. The limiting surface is an inwardly concave curved surface. Thus, during the process of pushing the main cylinder mold, left cylinder mold, and right cylinder mold to move close to the ring blank along the radial direction of the ring blank to extrude the ring blank, the limiting surface of the edge portion can apply pressure inward to the protruding part of the extruded ring blank. This prevents the stress on the protruding part of the ring blank between adjacent molds from being too concentrated when the ring blank is extruded, which would cause excessive deformation of the ring blank at that point and make the inner surface of the protruding part of the ring blank prone to cracking. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a forming tool for mounting edges;

[0026] Figure 2 A schematic diagram of the structure of the main cylinder die for extruding the ring blank;

[0027] Figure 3 A schematic diagram of the structure for extruding the ring blank using the left and right cylinder dies;

[0028] Figure 4 A schematic diagram of the structure when the main cylinder mold, left cylinder mold, right cylinder mold and the first forging are out of contact;

[0029] Figure 5 for Figure 1 A magnified view of a portion of point A in the middle;

[0030] Figure 6 This is a schematic diagram of the shaping component.

[0031] Figure 7 This is a schematic diagram of the second forging process;

[0032] Figure 8 This is a flowchart of a method for forming an mounting edge.

[0033] In the diagram: 10. Manufacturing tooling; 11. Main cylinder mold; 111. Second extrusion surface; 12. Right side mold; 121. Third extrusion surface; 13. Bottom cylinder mold; 131. First extrusion surface; 14. Left cylinder mold; 141. Fourth extrusion surface; 15. Positioning block; 16. Edge banding; 161. Limiting surface; 20. Shaping assembly; 21. Shaping outer mold; 22. Shaping groove; 23. Shaping punch; 30. Ring billet; 40. First forging; 41. Protrusion; 50. Second forging. Detailed Implementation

[0034] 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, and are not intended to imply any limitation on the scope of the disclosure.

[0035] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based 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 terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. 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 a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, 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 or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0036] This embodiment discloses a forming fixture 10 for mounting edges, such as... Figures 1 to 5 As shown, it includes:

[0037] The main cylinder mold 11, right cylinder mold 12, left cylinder mold 14, bottom cylinder mold 13, and positioning block 15 are provided. The main cylinder mold 11, right cylinder mold 12, left cylinder mold 14, and bottom cylinder mold 13 are combined to form an extrusion space. The positioning block 15 is located in the extrusion space and is used to position the ring blank 30 in the extrusion space. The side ends of the extrusion end face of the main cylinder mold 11, and / or the side ends of the extrusion end face of the left cylinder mold 14, and / or the side ends of the extrusion end face of the right cylinder mold 12, and / or the side ends of the extrusion end face of the bottom cylinder mold 13 are formed with an edge portion 16 protruding outward. The edge portion 16 forms a limiting surface 161 facing the side where the extrusion space is located. The limiting surface 161 is a first curved surface that is concave inward.

[0038] The extrusion end face of the main cylinder mold 11, the extrusion end face of the left cylinder mold 14, the extrusion end face of the right cylinder mold 12, the extrusion end face of the bottom cylinder mold 13, and the limiting surface 161 can be closed together to form a closed space.

[0039] In this embodiment, a rimmed portion 16 is formed by protruding outward from the side end of the extrusion end face of the main cylinder mold 11, and / or the side end of the extrusion end face of the left cylinder mold 14, and / or the side end of the extrusion end face of the right cylinder mold 12, and / or the side end of the extrusion end face of the bottom cylinder mold 13. The rimmed portion 16 forms a limiting surface 161 facing the side where the extrusion space is located. The limiting surface 161 is an inwardly concave curved surface. This allows the limiting surface 161 of the rimmed portion 16 to apply pressure towards the inside of the extruded portion ...

[0040] In this embodiment, the extrusion end face of the bottom cylinder mold 13 is the first extrusion end face 131, the extrusion end face of the main cylinder mold 11 is the second extrusion end face 111, the extrusion end face of the left cylinder mold 14 is the third extrusion end face 141, and the extrusion end face of the right cylinder mold 12 is the fourth extrusion end face 121. The side end of the second extrusion end face 111 of the main cylinder mold 11, and / or the side end of the third extrusion end face 141 of the left cylinder mold 14, and / or the side end of the fourth extrusion end face 121 of the right cylinder mold 12, and / or the side end of the first extrusion end face 131 of the bottom cylinder mold 13 protrude outward to form a edging portion 16. The limiting surface 161 of the edging portion 16 is smoothly transitioned and integrally disposed with the adjacent extrusion end face. The edging portion 16 can be set on the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and bottom cylinder mold 13 as needed. The edging portion 16 can be positioned where the second extrusion end face 111 of the main cylinder mold 11, the third extrusion end face 141 of the left cylinder mold 14, the fourth extrusion end face 121 of the right cylinder mold 12, the first extrusion end face 131 of the bottom cylinder mold 13, and the limiting surface 161 can form a closed space. It should be noted that in this embodiment, the movement of the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and bottom cylinder mold 13 is driven by hydraulic cylinders connected to each mold (this is conventional technology and will not be described in detail). When the positioning block 15 positions the ring blank 30, it can also be moved by hydraulic cylinders connected to the positioning block 15, thereby applying pressure to the ring blank 30 specimen (this is conventional technology and will not be described in detail).

[0041] In some embodiments, such as Figure 1 , Figure 2 As shown, the bottom cylinder mold 13 is provided with a first extrusion end face 131, which is a second curved surface that is concave inward; the positioning block 15 is used to position the ring blank 30 on the first extrusion end face 131.

[0042] In this embodiment, by setting the first extrusion end face 131 as an inwardly concave second curved surface, when the positioning block 15 positions the ring blank 30 on the first extrusion end face 131, the contact area between the positioning block 15 and the ring blank 30 can be reduced, thereby reducing the volume of the positioning block 15 and achieving lightweighting.

[0043] In some embodiments, such as Figures 1 to 5As shown, the left cylinder mold 14 is provided with a third extrusion end face 141, and the right cylinder mold 12 is provided with a fourth extrusion end face 121; the side end of the third extrusion end face 141 on the left cylinder mold 14 extends outward to form a edging portion 16; the side end of the fourth extrusion end face 121 on the right cylinder mold 12 extends outward to form a edging portion 16; the limiting surface 161 of the edging portion 16 on the left cylinder mold 14 is smoothly integrated with the third extrusion end face 141; the limiting surface 161 of the edging portion 16 on the right cylinder mold 12 is smoothly integrated with the fourth extrusion end face 121.

[0044] In this embodiment, by smoothly transitioning the limiting surface 161 of the edging portion 16 on the left cylinder mold 14 to the third extrusion end face 141 and smoothly transitioning the limiting surface 161 of the edging portion 16 on the right cylinder mold 12 to the fourth extrusion end face 121, the limiting surface 161 of the edging portion 16 can make the outer peripheral surface of the protrusion 41 of the first forging 40 and other parts of the outer peripheral surface of the first forging 40 smoother when the protrusion 41 of the edging portion 16 is extruded, thus avoiding burrs on the outer peripheral surface of the first forging 40 and improving product quality.

[0045] In some embodiments, the main cylinder mold 11 is provided with a second extrusion end face 111, and the side end of the main cylinder mold 11 of the second extrusion end face 111 and the side end of the bottom cylinder mold 13 of the first extrusion end face 131 are both provided with grooves, and the end face of the edge portion 16 can be fitted and connected with the grooves.

[0046] In this embodiment, grooves (not shown in the figure) are provided on both the side main cylinder mold 11 of the second extrusion end face 111 and the side bottom cylinder mold 13 of the first extrusion end face 131. The end of the edge portion 16 can be fitted into the groove, so that the edge portion 16 can fit into the groove when the protruding part 41 of the ring blank 30 is extruded. This avoids the possibility that the end face of the edge portion 16 may have gaps with the side end of the main cylinder mold 11 and the side end of the bottom cylinder mold 13, which would cause some material to enter the gap when the ring blank 30 is extruded, resulting in irregular dimensional forming of the ring blank 30.

[0047] This embodiment provides a method for forming an mounting edge, such as... Figure 8 As shown, it includes the following steps:

[0048] S11: Adjust the positions of the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and bottom cylinder mold 13 to form an extrusion space;

[0049] S12: Place the ring blank 30 in the extrusion space and fix the ring blank 30 on the first extrusion end face 131 of the bottom cylinder mold 13 using the positioning block 15;

[0050] S13: Push the main cylinder mold 11, left cylinder mold 14, and right cylinder mold 12 to move close to the ring blank 30 along the radial direction of the ring blank 30, and squeeze the ring blank 30 until the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, bottom cylinder mold 13, and edge portion 16 form a closed space and are interference-fitted with the ring blank 30 to obtain the first forging 40;

[0051] S14: Push the main cylinder mold 11, left cylinder mold 14, and right cylinder mold 12 away from the first forging 40 until the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and the edge portion 16 are no longer in contact with the first forging 40, and remove the first forging 40.

[0052] In this embodiment, the extrusion space in step S1 is the unclosed space formed by the first extrusion end face 131, the second extrusion end face 111, the third extrusion end face 141, the fourth extrusion end face 121, and the limiting surface 161. The distance from the first extrusion end face 131 to the second extrusion end face 111 and the distance from the third extrusion end face 141 to the fourth extrusion end face 121 are greater than the diameter of the ring blank 30, so that the ring blank 30 can be accommodated in the extrusion space. A certain thickness of asbestos can also be provided at the contact point between the positioning block 15 and the ring blank 30 to prevent the positioning block 15 from making hard contact with the inner surface of the ring blank 30, which would cause deformation of the ring blank 30. A certain thickness of asbestos can also be provided at the upper end of the positioning block 15 as needed, so that the ring blank 30 can come into contact with the asbestos at the upper end of the positioning block 15 after being extruded by the main cylinder mold 11, thus preventing the upper diameter of the positioning block 15 from making hard contact with the inner surface of the ring blank 30, which would cause damage to the inner surface of the ring blank 30.

[0053] In this embodiment, in step S13, the enclosed extrusion space is the enclosed space formed by the first extrusion end face 131, the second extrusion end face 111, the third extrusion end face 141, the fourth extrusion end face 121, and the limiting surface 161. When the main cylinder mold 11, the left cylinder mold 14, the right cylinder mold 12, the bottom cylinder mold 13, and the edge portion 16 are interference-fitted with the ring blank 30, the limiting surface 161 of the edge portion 16 abuts against the protrusion 41 in the first forging 40 formed after the ring blank 30 is extruded. The facet 161 can apply pressure to the protrusion 41 into the ring blank 30 during the formation of the protrusion 41, and limit the protrusion 41. This prevents the protrusion 41 from cracking due to excessive stress concentration caused by rapid deformation during the extrusion forming process of the ring blank 30 by the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12 and bottom cylinder mold 13. This greatly ensures the integrity of the first forging 40 obtained by extruding the ring blank 30 and improves the product yield.

[0054] In this embodiment, the third extrusion end face and the fourth extrusion end face 121 need to simultaneously extrude the ring blank 30 at the same speed to ensure uniform deformation of the ring blank 30 and uniform forming of the first forging 40.

[0055] In some embodiments, the main cylinder mold 11 is first pushed to move close to the ring blank 30 along the radial direction of the ring blank 30, squeezing the ring blank 30 until a portion of the inner surface of the ring blank 30 abuts against the positioning block 15. Then, the right cylinder mold 12 and the left cylinder mold 14 are pushed to move close to the ring blank 30 at the same speed along the radial direction of the ring blank 30, and simultaneously squeezing the ring blank 30 until the limiting surface 161 on the edge portion 16 forms a closed space with the first extrusion surface of the bottom cylinder mold 13, the second extrusion surface of the main cylinder mold 11, the third extrusion surface of the right cylinder mold 12, and the fourth extrusion surface of the left cylinder mold 14. The limiting surface 161, the first extrusion surface, the second extrusion surface, the third extrusion surface, and the fourth extrusion surface are interference-fitted with the ring blank 30 to obtain the first forging 40. The edge portion 16 is disposed on the left cylinder mold 14 and the right cylinder mold 12.

[0056] In this embodiment, the edge portion 16 is disposed on the left cylinder mold 14 and the right cylinder mold 12. When the main cylinder mold 11 extrudes the ring blank 30, causing part of the inner surface of the ring blank 30 to abut against the upper end of the positioning block 15, and then the left cylinder mold 14 and the right cylinder mold 12 are moved to extrude the ring blank 30 at the same speed, when the limiting surface 161 on the edge portion 16 forms a closed space with the first extrusion surface of the bottom cylinder mold 13, the second extrusion surface of the main cylinder mold 11, the third extrusion surface of the right cylinder mold 12, and the fourth extrusion surface of the left cylinder mold 14, and the ring blank 30 is extruded to an interference fit, the limiting surface 161 can prevent the protrusion 41 from cracking due to excessive stress concentration caused by rapid deformation during the extrusion forming process of the ring blank 30 by the main cylinder mold 11, the left cylinder mold 14, the right cylinder mold 12, and the bottom cylinder mold 13, thus greatly ensuring the integrity of the first forging 40 obtained by extruding the ring blank 30.

[0057] In some embodiments, the movement speed of the main cylinder mold 11, left cylinder mold 14, and right cylinder mold 12 when extruding the ring blank 30 is 5 to 10 mm / s.

[0058] In this embodiment, by setting the main cylinder mold 11, left cylinder mold 14, and right cylinder mold 12 to an extrusion speed of 5-10 mm / s, the main cylinder mold 11, left cylinder mold 14, and right cylinder mold 12 can extrude the ring blank 30 at a slower speed, so that the ring blank 30 can deform slowly and evenly. The purpose of this is to prevent the ring blank 30 from deforming too quickly, which would cause irregular deformation, excessive stress change at the protrusion 41, and cracks, thereby making the quality of the first forging 40 not meet the requirements.

[0059] In some embodiments, the first forging 40 is interference-fitted with the main cylinder mold 11, the left cylinder mold 14, the right cylinder mold 12, the bottom cylinder mold 13, and the edge portion 16 for 5-10 seconds.

[0060] In this embodiment, by interfering with the first forging 40 with the main cylinder mold 11, the left cylinder mold 14, the right cylinder mold 12, the bottom cylinder mold 13, and the edge portion 16 for 5 to 10 seconds, the shape of the first forging 40 is stabilized, which can achieve a better shaping effect on the first forging 40. This can prevent the first forging 40 from undergoing plastic deformation and changing its shape if it suddenly loses contact with the main cylinder mold 11, the left cylinder mold 14, and the right cylinder mold 12 after it is formed.

[0061] In some embodiments, the main cylinder mold 11 is pushed away from the first forging 40 until the main cylinder mold 11 disengages from the first forging 40. Then, the left cylinder mold 14 and the right cylinder mold 12 are pushed away from the first forging 40 until the left cylinder mold 14, the right cylinder mold 12, and the edge portion 16 disengage from the first forging 40. Then, the first forging 40 is removed.

[0062] In this embodiment, the main cylinder mold 11 is first moved away from the first forging 40. After the main cylinder mold 11 is no longer in contact with the first forging 40, the left cylinder mold 14 and the right cylinder mold 12 are moved away from the first forging 40 at the same speed. Since the edge portion 16 is provided on the left cylinder mold 14 and the right cylinder mold 12, after the main cylinder mold 11 is no longer in contact with the first forging 40, the edge portion 16 can also restrict the displacement of the protrusion 41 on the first forging 40, thus avoiding the situation where the stress on the first forging 40 changes due to the main cylinder mold 11 being no longer in contact with the first forging 40, thereby causing the first forging 40 to deform.

[0063] In some embodiments, the main cylinder mold 11, the left cylinder mold 14, and the right cylinder mold 12 move away from the first forging 40 at a speed of 5 to 10 mm / s.

[0064] In this embodiment, by moving the main cylinder mold 11, the left cylinder mold 14, and the right cylinder mold 12 slowly away from the first forging 40 at a speed of 5-10 mm / s and disengaging from contact, it is possible to avoid the situation where the stress on the first forging 40 changes rapidly due to the excessively fast movement speed of the main cylinder mold 11, the left cylinder mold 14, and the right cylinder mold 12, which would cause the first forging 40 to expand outward and result in the first forging 40 not meeting the required dimensions.

[0065] In the above process, before extruding the ring blank 30, the ring blank 30 is first heated to 100-200°C. Then, the ring blank 30 is extruded using the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and bottom cylinder mold 13 at 200-300°C. This ensures that the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and main / bottom cylinder mold 13 have a certain temperature, and that the temperature is always higher than that of the ring blank 30. The purpose of this is to ensure that when the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and bottom cylinder mold 13 extrude the ring blank 30, the heat from the main cylinder mold 11, left cylinder mold 14, right cylinder mold 12, and bottom cylinder mold 13 can be conducted to the ring blank 30 during the heat dissipation process. This ensures the extrusion temperature of the ring blank 30 and avoids excessively rapid heat dissipation of the ring blank 30, which could lead to localized rapid cooling and cracking.

[0066] After obtaining the first forging 40 (the mounting edge mentioned above), the first forging 40 is removed from the bottom cylinder mold 13, and the first forging 40 is shaped using the shaping assembly 20. For example... Figure 6 , Figure 7 As shown, the shaping component 20 includes a shaping outer mold 21, a shaping groove 22, and a shaping punch 23. The shaping groove 22 is disposed on the shaping outer mold 21 and is a central channel with openings at both ends. The shape of the shaping groove 22 is the same as the outer peripheral surface shape of the required mounting edge. The shape of the maximum end cross-section of the shaping punch 23 is similar to the inner circle shape of the mounting edge cross-section, and the profile of the maximum end cross-section of the shaping punch 23 is larger than the profile of the inner peripheral surface cross-section of the mounting edge. The shape of the minimum end cross-section of the shaping punch 23 is similar to the profile of the inner peripheral surface cross-section of the mounting edge, and the profile of the minimum end cross-section of the shaping punch 23 is smaller than the profile of the inner peripheral surface cross-section of the mounting edge. After obtaining the first forging 40, it is placed into the forming groove 22 on the forming outer die 21. The smallest end of the forming punch 23 is inserted into the inner circumference of the first forging 40, and pressure is applied to the forming punch 23. The forming punch 23 presses the inner circumferential surface of the first forging 40, and makes the outer circumferential surface of the first forging 40 fit tightly against the contour of the inner circumferential surface of the forming groove 22, forming the second forging 50 (the forming mounting edge). In the above, the ring billet 30 is formed by upsetting, punching, and rolling of heated high-temperature alloy bar stock (this is a conventional technical method and will not be described in detail here).

[0067] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this disclosure.

Claims

1. A molding tool for installing a rim, characterized by, The installation edge forming tooling comprises: a main cylinder mold, a right cylinder mold, a left cylinder mold, a bottom cylinder mold, and a positioning block; the main cylinder mold, the right cylinder mold, the left cylinder mold, and the bottom cylinder mold jointly form an extrusion space; the positioning block is located in the extrusion space and is used for positioning a ring blank in the extrusion space; a side end of an extrusion end surface of the main cylinder mold, a side end of an extrusion end surface of the left cylinder mold, a side end of an extrusion end surface of the right cylinder mold, and a side end of an extrusion end surface of the bottom cylinder mold outwardly protrude to form a wrapping part, or a side end of an extrusion end surface of the main cylinder mold and a side end of an extrusion end surface of the bottom cylinder mold outwardly protrude to form a wrapping part; the wrapping part forms a limiting surface toward a side where the extrusion space is located, and the limiting surface is a first curved surface that is inwardly recessed; wherein the extrusion end surface of the main cylinder mold, the extrusion end surface of the left cylinder mold, the extrusion end surface of the right cylinder mold, the extrusion end surface of the bottom cylinder mold, and the limiting surface can jointly form a closed space; the extrusion end surface of the bottom cylinder mold is a first extrusion end surface, and the first extrusion end surface is a second curved surface that is inwardly recessed; and the positioning block is used for positioning the ring blank on the first extrusion end surface.

2. The installation edge forming tooling according to claim 1, wherein the extrusion end surface of the main cylinder mold is a second extrusion end surface, a side end of the second extrusion end surface of the main cylinder mold and a side end of the first extrusion end surface of the bottom cylinder mold are both provided with grooves, and an end surface of the wrapping part can be embeddedly connected with the grooves.

3. A method of forming a mounting flange, the method being applied to the forming tool of any one of claims 1 to 2, characterized in that, The installation edge forming tooling comprises the following steps: S11: adjusting positions of the main cylinder mold, the left cylinder mold, the right cylinder mold, and the bottom cylinder mold to form an extrusion space; S12: placing a ring blank in the extrusion space and fixing the ring blank on the first extrusion end surface of the bottom cylinder mold by using the positioning block; S13: pushing the main cylinder mold, the left cylinder mold, and the right cylinder mold to move along a radial line direction of the ring blank to approach the ring blank, extruding the ring blank until the main cylinder mold, the left cylinder mold, the right cylinder mold, the bottom cylinder mold, and the wrapping part form a closed space and are in interference fit with the ring blank, to obtain a first forged piece; S14: pushing the main cylinder mold, the left cylinder mold, and the right cylinder mold to move away from the first forged piece until the main cylinder mold, the left cylinder mold, the right cylinder mold, and the wrapping part are out of contact with the first forged piece, and the first forged piece is removed.

4. A method of forming a mounting flange according to claim 3, wherein Step S13 specifically comprises: firstly pushing the main cylinder mold to move along the radial line direction of the ring blank to approach the ring blank, extruding the ring blank until a part of an inner surface of the ring blank abuts against the positioning block, then pushing the right cylinder mold and the left cylinder mold to move along the radial line direction of the ring blank at the same speed to approach the ring blank and simultaneously extruding the ring blank until a limiting surface on the wrapping part forms a closed space with the extrusion end surface of the bottom cylinder mold, the extrusion end surface of the main cylinder mold, the extrusion end surface of the right cylinder mold, and the extrusion end surface of the left cylinder mold, and the limiting surface, each extrusion end surface, and the ring blank are in interference fit, to obtain the first forged piece.

5. A method of forming a mounting flange according to claim 4, wherein The movement speed of the main cylinder mold, the left cylinder mold, and the right cylinder mold when extruding the ring blank is 5-10 mm / s.

6. A method of forming a mounting flange according to claim 5, wherein The first forging piece is in interference fit with the main cylinder mold, the left cylinder mold, the right cylinder mold, the bottom cylinder mold and the edge covering part for 5-10s.

7. A method of forming a mounting flange according to claim 6, wherein The step S14 is specifically: The main cylinder mold is pushed away from the first forging piece until the main cylinder mold is out of contact with the first forging piece, then the left cylinder mold and the right cylinder mold are simultaneously pushed away from the first forging piece until the left cylinder mold, the right cylinder mold and the edge covering part are out of contact with the first forging piece, and then the first forging piece is taken off.

8. A method of forming a mounting flange according to claim 7, wherein, The speed of the main cylinder mold, the left cylinder mold and the right cylinder mold moving away from the first forging piece is 5-10mm / s.

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