Forging forming die without typical parting surface and forging forming method

Abstract

The invention relates to the field of forging, and provides a forging forming die without a typical parting surface and a forging forming method. The forging forming die without the typical parting surface comprises a lower die core. The at least two side dies are suitable for being switched between an attaching position and a separating position relative to the lower die core, in the attaching position, the at least two side dies are suitable for being attached to the side dies to form a die cavity, and in the separating position, the at least two side dies are suitable for being away from the lower die core; the die sleeve is suitable for being switched between a pressing position and a separating position relative to the side die, in the pressing position, the die sleeve is suitable for being pressed on the peripheral face of the side die, and in the separating position, the die sleeve is suitable for being separated from the side die; and the upper die core is suitable for acting relative to the lower die core so as to forge the blank in the die cavity. According to the forging forming die, near-net forming of various complex parts without typical parting surfaces can be improved, the material utilization rate and the forming precision of forgings can be improved, and smooth demolding is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of forging, and provides a forging forming die without a typical parting surface and a forging forming method. Background Art

[0002] For complex parts without typical parting surfaces, using ordinary die forging will cause demolding difficulties or reduce material utilization, including but not limited to the following types of parts: Parts with thick ends and thin middle and cavities at the ends, such as automobile wheels or Laval nozzles. Taking the Laval nozzle as an example, it is composed of two conical tubes, with thick ends and thin middle. If this part is forged by ordinary die forging method, there is no obvious parting surface, and it is difficult to demold; Parts with short bosses, lugs or short shafts on the sides and cavities at the ends, which are difficult to forge using ordinary die forging methods; Parts with cavities on the sides, such as common tees and crosses; Deep-ribbed and thin-ribbed forgings are difficult to demold during ordinary forging processes.

[0003] Therefore, the above-mentioned complex parts are not suitable for forming by ordinary die forging methods. They can be forged by multi-directional die forging equipment, but the number of multi-directional die forging equipment is small and the cost is high. In addition, the upper and lower die core concentric guide mechanisms currently often use guide pins and guide sleeves or upper and lower die mechanisms that first position and then lock the die core. The former has a large design gap, and the latter will loosen the locked die core after multiple forging cycles, causing the guide surface to wear. The precision of the concentric guides of the two is low, which is not conducive to the high-precision near-net forming of forgings. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a forging forming die without a typical parting surface, which can improve the near-net forming of various types of complex parts without a typical parting surface.

[0005] An embodiment of the present invention also provides a forging forming method.

[0006] A first aspect of the present invention provides a forging die without a typical parting surface, comprising: Lower mold core; At least two side molds are adapted to switch between a fitting position and a separation position relative to the lower mold core, wherein at least two of the side molds are adapted to fit the side mold to form a mold cavity, and at least two of the side molds are adapted to be away from the lower mold core at the separation position; The mold sleeve is adapted to switch between a pressing position and a disengaging position relative to the side mold, wherein the mold sleeve is adapted to be pressed against the outer peripheral surface of the side mold at the pressing position and the mold sleeve is adapted to be disengaged from the side mold at the disengaging position; The upper die core is adapted to move relative to the lower die core to forge the blank in the die cavity.

[0007] According to the forging forming die without a typical parting surface provided by the embodiment of the first aspect of the present invention, at least two side dies are set, and at least two side dies are set in a form that can be switched between a fitting position and a separation position, so that the side dies can fit with the lower die core to form a cavity, and the cavity can clamp the blank. By setting the die sleeve to be switchable between a pressing position and a disengaging position, the die sleeve can be pressed against the outer peripheral surface of the side die and a certain pre-tightening force can be applied to the side die, thereby improving the clamping force of the side die on the blank. When the upper die core is close to the lower die core, the forging of the blank can be completed. As a result, the near-net forming of various types of complex parts without a typical parting surface can be improved, such as a four-way part with a cavity on the side, a missile nozzle, a cylindrical forging with a lug, etc. The forging forming die without a typical parting surface can improve the material utilization rate and the forming accuracy of the forging, and ensure smooth demolding.

[0008] According to one embodiment of the present invention, in a plane perpendicular to the axis of the side mold, mutually connected oblique square grooves and semicircular grooves are provided on opposite sides of each side mold; Also included is a mandrel mold, the mandrel mold comprising an oblique square mold and a circular mold; From the separation position to the fitting position, the oblique square mold is suitable for being inserted into the oblique square groove, and the circular mold is suitable for being inserted into the semicircular grooves on the two adjacent side molds; from the fitting position to the separation position, the oblique square mold is suitable for being withdrawn from the oblique square groove, and the circular mold is suitable for being withdrawn from the semicircular grooves on the two adjacent side molds.

[0009] According to one embodiment of the present invention, a first positioning surface is formed on the outer surface of the lower mold core, and a second positioning surface is formed on the inner surface of at least two of the side molds at positions corresponding to the first positioning surface; The inner surface of the mold sleeve is formed with a first pressing surface, and the outer surfaces of at least two of the side molds are formed with a second pressing surface; In the fitting position, the lower mold core and at least two of the side molds are suitable for positioning and matching through the first positioning surface and the second positioning surface; In the clamping position, the mold sleeve and at least two side molds are suitable for positioning and matching through the first clamping surface and the second clamping surface to achieve clamping; Wherein, the first pressing surface and the second pressing surface are both inclined surfaces.

[0010] According to one embodiment of the present invention, the outer surface of the upper mold core is provided with a third positioning surface, and the inner surfaces of at least two of the side molds are provided with fourth positioning surfaces at positions corresponding to the third positioning surface; When the upper mold core approaches the lower mold core, the upper mold core and at least two side molds are suitable for positioning and matching through the third positioning surface and the fourth positioning surface.

[0011] According to one embodiment of the present invention, a backing plate is further included, and the lower mold core is formed on the backing plate.

[0012] According to one embodiment of the present invention, a first driving device and a second driving device are provided on the backing plate, the first driving device is transmission-connected to at least two of the side molds, and the second driving device is transmission-connected to the mold sleeve.

[0013] According to one embodiment of the present invention, the first driving device is suitable for driving at least two of the side molds to move in a plane perpendicular to the axis of the upper mold core; The second driving device is suitable for driving the mold sleeve to move in a plane parallel to the axis of the upper mold core.

[0014] According to one embodiment of the present invention, an ejection mechanism is further provided on the backing plate, a through hole is provided on the lower die core, and the ejection mechanism is suitable for passing through the through hole to eject the forged blank.

[0015] A second aspect of the present invention provides a forging method based on the forging die without a typical parting surface, comprising: Switching at least two of the side molds from the separated position to the attached position; placing the blank in the mold cavity; Switching the mold sleeve from the disengaged position to the clamped position; The upper die core is driven to forge the blank.

[0016] According to the forging forming method provided by the second embodiment of the present invention, by using the forging forming die without typical parting surface, the near-net forming of various types of complex parts without typical parting surface can be improved, and smooth demolding can be achieved. The forging forming method has the advantages of high forming efficiency and low forming difficulty.

[0017] According to one embodiment of the present invention, after the step of driving the upper die core to forge the blank, the method includes: Switching the mold sleeve from the pressing position to the disengaging position; Switching at least two of the side molds from the fitting position to the separation position; Take out the forged blank.

[0018] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: According to the forging forming die without a typical parting surface provided by the embodiment of the first aspect of the present invention, at least two side dies are set, and at least two side dies are set in a form that can be switched between a fitting position and a separation position, so that the side dies can fit with the lower die core to form a cavity, and the cavity can clamp the blank. By setting the die sleeve to be switchable between a pressing position and a disengaging position, the die sleeve can be pressed against the outer peripheral surface of the side die and a certain pre-tightening force can be applied to the side die, thereby improving the clamping force of the side die on the blank. When the upper die core is close to the lower die core, the forging of the blank can be completed. As a result, the near-net forming of various types of complex parts without a typical parting surface can be improved, such as a four-way part with a cavity on the side, a missile nozzle, a cylindrical forging with a lug, etc. The forging forming die without a typical parting surface can improve the material utilization rate and the forming accuracy of the forging, and ensure smooth demolding.

[0019] Furthermore, according to the forging forming method provided by the second embodiment of the present invention, by using the forging forming die without typical parting surface, the near-net forming of various types of complex parts without typical parting surface can be improved, and smooth demolding can be achieved. The forging forming method has the advantages of high forming efficiency and low forming difficulty.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic cross-sectional view of an unforged upper die core in a forging forming die without a typical parting surface provided by an embodiment of the present invention; Figure 2 It is a schematic top view of a forging forming die without a typical parting surface provided by an embodiment of the present invention, in which a side die is in a fitting position; Figure 3 is a schematic side view of a forging forming die without a typical parting surface provided by an embodiment of the present invention; Figure 4It is a schematic cross-sectional view of forging of an upper die core in a forging forming die without a typical parting surface provided by an embodiment of the present invention; Figure 5 It is a schematic top view of a forging forming die without a typical parting surface provided by an embodiment of the present invention, in which a side die is in a separated position; Figure 6 It is a schematic cross-sectional view of a die sleeve in a disengaged position in a forging forming die without a typical parting surface provided by an embodiment of the present invention; Figure 7 It is a schematic cross-sectional view of a forging forming die without a typical parting surface provided by an embodiment of the present invention, in which a side die is in a separated position; Figure 8 is a schematic top view of another forging forming die without a typical parting surface provided by an embodiment of the present invention; Fig. 9 is a schematic cross-sectional view of another forging forming die without a typical parting surface provided by an embodiment of the present invention; Fig.10 It is a schematic flow chart of the forging forming method provided by an embodiment of the present invention.

[0023] Reference numerals: 100, lower mold core; 102, side mold; 104, mold sleeve; 106, upper mold core; 108, oblique square groove; 110, semicircular groove; 112, mandrel mold; 114, circular mold; 116, pad; 118, first drive device; 120, second drive device; 122, ejection mechanism. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] like Figures 1 to 9 As shown, the first embodiment of the present invention provides a forging forming die without a typical parting surface, comprising: Lower mold core 100; At least two side molds 102 are adapted to switch between a fitting position and a separation position relative to the lower mold core 100. In the fitting position, the at least two side molds 102 are adapted to fit the side mold 102 to form a mold cavity. In the separation position, the at least two side molds 102 are adapted to be away from the lower mold core 100. The mold sleeve 104 is adapted to switch between a pressing position and a disengaging position relative to the side mold 102. In the pressing position, the mold sleeve 104 is adapted to be pressed against the outer peripheral surface of the side mold 102. In the disengaging position, the mold sleeve 104 is adapted to be disengaged from the side mold 102. The upper die core 106 is adapted to move relative to the lower die core 100 to forge the blank in the die cavity.

[0030] According to the forging forming die without a typical parting surface provided by the embodiment of the first aspect of the present invention, at least two side dies 102 are provided, and at least two side dies 102 are provided in a form that can be switched between a fitting position and a separation position, so that the side dies 102 can fit with the lower die core 100 to form a die cavity, and the die cavity can clamp the blank. By setting the die sleeve 104 to be switchable between a pressing position and a disengaging position, the die sleeve 104 can be pressed against the outer peripheral surface of the side die 102 and apply a certain pre-tightening force to the side die 102, thereby improving the clamping force of the side die 102 on the blank. When the upper die core 106 is close to the lower die core 100, the forging of the blank can be completed. Thus, the near-net forming of various types of complex parts without a typical parting surface can be improved, such as a four-way part with a cavity on the side, a missile nozzle, a cylindrical forging with a lug, etc. The forging forming die without a typical parting surface can improve the material utilization rate and the forming accuracy of the forging, and ensure smooth demoulding.

[0031] Please continue to see Figures 1 to 9 In an embodiment of the present invention, the forging forming die mainly includes a backing plate 116, a lower die core 100 is integrally formed on the backing plate 116, at least two side dies 102 are arranged on both sides of the lower die core 100, and a die sleeve 104 and an upper die core 106 are arranged above the lower die core 100.

[0032] Specifically, taking the case where there are two side molds 102 as an example, the two side molds 102 are roughly semicircular in structure, and at least two side molds 102 can switch between a separation position and a fitting position. In the embodiment of the present invention, in order to realize the driving of the side mold 102, a first driving device 118 is also provided on the pad 116, and the first driving device 118 mentioned here can be a hydraulic component. Among them, a first driving device 118 is provided on each side mold 102, and the first driving device 118 can drive the side mold 102 to move in a plane perpendicular to the axis of the upper mold core 106. That is, the first driving device 118 can drive the side mold 102 to switch between a fitting position fitting the lower mold core 100 and a separation position away from the lower mold core 100.

[0033] According to one embodiment of the present invention, a first positioning surface is formed on the outer surface of the lower mold core 100, and a second positioning surface is formed on the inner surface of at least two side molds 102 at a position corresponding to the first positioning surface; in the fitting position, the lower mold core 100 and at least two side molds 102 are suitable for positioning and matching through the first positioning surface and the second positioning surface.

[0034] It is understandable that a first positioning surface is formed on the outer surface of the lower mold core 100, and the first positioning surface may be a cylindrical surface. Accordingly, a second positioning surface is formed on the inner surface of each side mold 102 at a position corresponding to the first positioning surface, and the second positioning surface may also be a cylindrical surface. When the side mold 102 is switched from the separation position to the fitting position, the second positioning surface on the side mold 102 can fit with the first positioning surface on the lower mold core 100, thereby completing the axial positioning of the side mold 102 and the lower mold core 100.

[0035] It should be noted that when the side mold 102 is attached to the lower mold core 100 , the side mold 102 and the lower mold core 100 can enclose a mold cavity for placing the blank.

[0036] According to one embodiment of the present invention, in a plane perpendicular to the axis of the side mold 102, mutually connected oblique square grooves 108 and semicircular grooves 110 are provided on opposite sides of each side mold 102; The forging forming die also includes a mandrel die 112, and the mandrel die 112 includes an oblique square die and a circular die 114; From the separation position to the fitting position, the oblique square mold is suitable for being inserted into the oblique square groove 108, and the circular mold 114 is suitable for being inserted into the semicircular grooves 110 on the two adjacent side molds 102; from the fitting position to the separation position, the oblique square mold is suitable for being withdrawn from the oblique square groove 108, and the circular mold 114 is suitable for being withdrawn from the semicircular grooves 110 on the two adjacent side molds 102.

[0037] like Figure 7 As shown, when it is necessary to forge parts with cavities on the side, such as three-way and four-way parts, an oblique square groove 108 and a semicircular groove 110 are set on the sides of two adjacent side molds 102. Correspondingly, the forging forming die also includes a mandrel mold 112 and a circular mold 114. When the side mold 102 switches from the separation position to the fitting position, the semicircular grooves 110 on the two adjacent side molds 102 can be connected to each other to form a complete circular groove. At the same time, the mandrel mold 112 is synchronously inserted into the oblique square groove 108, and the circular mold 114 is synchronously inserted into the circular groove. In this process, the mandrel mold 112 and the circular mold 114 participate in the mold closing together with the side mold 102 and the lower mold core 100. When the side mold 102 switches from the fitting position to the separation position, the semicircular grooves 110 on the two adjacent side molds 102 move away from each other. At the same time, the mandrel mold 112 is synchronously withdrawn from the oblique square groove 108, and the circular mold 114 is synchronously withdrawn from the circular groove.

[0038] It should be noted that, in the embodiment of the present invention, the oblique square groove 108 is formed on the side mold 102 in a plane perpendicular to the axial direction of the side mold 102. Of course, it can be understood that when a cavity in other directions is formed on the side of the part, the opening direction of the oblique square groove 108 can be consistent with the opening direction of the cavity.

[0039] In the embodiment of the present invention, the mold sleeve 104 is used to achieve compression of the side mold 102 and provide a certain pre-tightening force to the side mold 102. Therefore, the mold sleeve 104 is suitable for switching between a compression position and a disengagement position relative to the side mold 102. When the mold sleeve 104 is in the compression position, the mold sleeve 104 can be compressed against the outer surface of the side mold 102. At this time, the mold sleeve 104 can apply a certain pre-tightening force to the side mold 102. When the mold sleeve 104 is in the disengagement position, the mold sleeve 104 and the side mold 102 are away from each other.

[0040] In order to achieve the compression between the mold sleeve 104 and the side mold 102, a first compression surface is formed on the inner surface of the mold sleeve 104, and a second compression surface is formed on the outer surface of the side mold 102; in the compression position, the mold sleeve 104 and at least two side molds 102 are suitable for positioning and matching through the first compression surface and the second compression surface to achieve compression; wherein, the first compression surface and the second compression surface are both inclined surfaces.

[0041] The first pressing surface formed on the inner surface of the mold sleeve 104 is an inclined surface, and correspondingly, the second pressing surface formed on the outer surface of the side mold 102 is also an inclined surface, and the inclination angle of the first pressing surface is consistent with the inclination angle of the second pressing surface. It should be noted that in the embodiment of the present invention, the inclination direction of the first pressing surface is: taking the axial direction of the upper mold core 106 as the axis, from the top to the bottom, the first pressing surface gradually moves away from the axial direction of the upper mold core 106. Similarly, the inclination direction of the second pressing surface is the same as the inclination direction of the first pressing surface. Therefore, when the mold sleeve 104 gradually approaches the side mold 102 from top to bottom, the first pressing surface can gradually press the second pressing surface, thereby applying a pre-tightening force to the side mold 102 through the mold sleeve 104.

[0042] Since the side mold 102 has been positioned with the lower mold core 100 , the mold sleeve 104 and the side mold 102 can also be positioned and matched through the compression fit of the first compression surface and the second compression surface.

[0043] According to one embodiment of the present invention, a second driving device 120 is disposed on the backing plate 116 , and the second driving device 120 is transmission-connected to the mold sleeve 104 .

[0044] As mentioned above, in order to drive the mold sleeve 104, a second driving device 120 is provided on the pad 116. The second driving device 120 may use a hydraulic cylinder, etc. The second driving device 120 is used to drive the mold sleeve 104 to switch between the clamping position and the disengagement position.

[0045] According to one embodiment of the present invention, the second driving device 120 is suitable for driving the mold sleeve 104 to move in a plane parallel to the axis of the upper mold core 106 .

[0046] See also Figure 1 , Figure 4 and Figure 6 In the embodiment of the present invention, the second driving device 120 moves in the axial direction of the upper mold core 106, thereby the second driving device 120 can drive the mold sleeve 104 to move in the axial direction of the upper mold core 106. Figure 1 Altitude direction action shown.

[0047] According to one embodiment of the present invention, the outer surface of the upper mold core 106 is provided with a third positioning surface, and the inner surfaces of at least two side molds 102 are formed with fourth positioning surfaces at positions corresponding to the third positioning surface; When the upper mold core 106 approaches the lower mold core 100 , the upper mold core 106 and the at least two side molds 102 are adapted to be positioned and matched through the third positioning surface and the fourth positioning surface.

[0048] In the embodiment of the present invention, in order to achieve positioning between the upper mold core 106 and the side mold 102, a third positioning surface is provided on the outer surface of the upper mold core 106, and the third positioning surface can be a cylindrical surface. Correspondingly, the fourth positioning surface is also a cylindrical surface. By such a configuration, when the upper mold core 106 moves downward, the upper mold core 106 can achieve positioning with the inner surface of the side mold 102 through the positioning cooperation of the third positioning surface and the fourth positioning surface.

[0049] Combined with the above, since the side mold 102 has been positioned with the lower mold core 100, and the mold sleeve 104 and the side mold 102 have also been positioned, combined with the positioning of the upper mold core 106 and the side mold 102, the lower mold core 100 can be used as a reference to achieve synchronous and coaxial positioning of the upper mold core 106, the mold sleeve 104, the side mold 102 and the lower mold core 100.

[0050] According to one embodiment of the present invention, an ejection mechanism 122 is further provided on the backing plate 116 , and a through hole is opened in the lower die core 100 . The ejection mechanism 122 is suitable for passing through the through hole to eject the forged blank.

[0051] like Figure 1 As shown, in order to remove the forged blank, an ejection mechanism 122 is further provided on the backing plate 116. For this purpose, a through hole is opened in the lower die core 100, and the ejection mechanism 122 can pass through the through hole to eject the forged blank.

[0052] like Fig.10 As shown, the second embodiment of the present invention provides a forging forming method based on the forging forming die without a typical parting surface, comprising: Step 10, switching at least two side molds 102 from a separated position to a fitted position; Step 20, placing the blank in the mold cavity; Step 30, switching the mold sleeve 104 from the disengaged position to the clamped position; Step 40 , driving the upper die core 106 to forge the blank.

[0053] According to the forging forming method provided by the second embodiment of the present invention, by using the forging forming die without typical parting surface, the near-net forming of various types of complex parts without typical parting surface can be improved, and smooth demolding can be achieved. The forging forming method has the advantages of high forming efficiency and low forming difficulty.

[0054] Specifically, in step 10, the first driving device 118 drives the side mold 102 to switch from the separated position to the attached position attached to the lower mold core 100. At this time, the side mold 102 and the lower mold core 100 enclose a mold cavity for placing the blank. In step 20, the blank may be preheated, and then the heated blank is placed in the mold cavity; In step 30, the mold sleeve 104 is switched from the disengaged position to the clamped position by the second driving device 120, so that the mold sleeve 104 is attached to the side mold 102 and a certain pre-tightening force is applied to the side mold 102; In step 40, the upper die core 106 is driven to move toward a position close to the lower die core 100 so that the upper die core 106 forges the blank; According to one embodiment of the present invention, after step 40, the following steps are included: Step 50, switching the mold sleeve 104 from the pressing position to the disengaging position; Step 60, switching at least two side molds 102 from the bonding position to the separation position; Step 70, taking out the forged blank.

[0055] Specifically, in step 50, after the forging is completed, the die sleeve 104 is switched from the clamping position to the disengaging position by the second driving device 120, at which time the pre-tightening force applied to the side die 102 disappears; In step 60, the side mold 102 is switched from the fitting position to the separation position by the first driving device 118, and at this time, the mold cavity formed by the side mold 102 and the lower mold core 100 is open; In step 70 , the forged blank may be ejected by the ejection mechanism 122 .

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A forging die without a typical parting surface, characterized in that: include: Lower mold core (100); At least two side molds (102) are adapted to switch between a fitting position and a separation position relative to the lower mold core (100); in the fitting position, at least two of the side molds (102) are adapted to fit the side mold (102) to form a mold cavity; in the separation position, at least two of the side molds (102) are adapted to be away from the lower mold core (100); A mold sleeve (104) is adapted to switch between a pressing position and a disengaging position relative to the side mold (102); in the pressing position, the mold sleeve (104) is adapted to be pressed against the outer peripheral surface of the side mold (102); in the disengaging position, the mold sleeve (104) is adapted to be disengaged from the side mold (102); An upper die core (106) is adapted to move relative to the lower die core (100) to forge the blank in the die cavity.

2. The forging die without a typical parting surface according to claim 1, characterized in that: In a plane perpendicular to the axis of the side mold (102), mutually communicating oblique square grooves (108) and semicircular grooves (110) are provided on opposite sides of each side mold (102); It also includes a mandrel mold (112), wherein the mandrel mold (112) includes a rhombus mold and a circular mold (114); From the separation position to the fitting position, the oblique square mold is suitable for being inserted into the oblique square groove (108), and the circular mold (114) is suitable for being inserted into the semicircular grooves (110) on two adjacent side molds (102); from the fitting position to the separation position, the oblique square mold is suitable for being withdrawn from the oblique square groove (108), and the circular mold (114) is suitable for being withdrawn from the semicircular grooves (110) on two adjacent side molds (102).

3. The forging forming die without a typical parting surface according to claim 1, characterized in that: A first positioning surface is formed on the outer surface of the lower mold core (100), and a second positioning surface is formed on the inner surfaces of at least two of the side molds (102) at positions corresponding to the first positioning surface; The inner surface of the mold sleeve (104) is formed with a first pressing surface, and the outer surfaces of at least two of the side molds (102) are formed with a second pressing surface; In the fitting position, the lower mold core (100) and at least two side molds (102) are suitable for positioning and matching through the first positioning surface and the second positioning surface; In the pressing position, the mold sleeve (104) and at least two of the side molds (102) are suitable for positioning and matching through the first pressing surface and the second pressing surface to achieve pressing; Wherein, the first pressing surface and the second pressing surface are both inclined surfaces.

4. The forging forming die without a typical parting surface according to claim 3, characterized in that: The outer surface of the upper mold core (106) is provided with a third positioning surface, and the inner surfaces of at least two of the side molds (102) are provided with fourth positioning surfaces at positions corresponding to the third positioning surface; In the process of the upper mold core (106) approaching the lower mold core (100), the upper mold core (106) and at least two of the side molds (102) are suitable for positioning and matching through the third positioning surface and the fourth positioning surface.

5. The forging die without a typical parting surface according to any one of claims 1 to 4, characterized in that: It also includes a backing plate (116), and the lower mold core (100) is formed on the backing plate (116).

6. The forging forming die without a typical parting surface according to claim 5, characterized in that: A first drive device (118) and a second drive device (120) are provided on the backing plate (116); the first drive device (118) is transmission-connected to at least two of the side molds (102); and the second drive device (120) is transmission-connected to the mold sleeve (104).

7. The forging forming die without a typical parting surface according to claim 6, characterized in that: The first driving device (118) is suitable for driving at least two of the side molds (102) to move in a plane perpendicular to the axis of the upper mold core (106); The second driving device (120) is suitable for driving the mold sleeve (104) to move in a plane parallel to the axis of the upper mold core (106).

8. The forging forming die without a typical parting surface according to claim 5, characterized in that: An ejection mechanism (122) is also provided on the backing plate (116), a through hole is provided in the lower die core (100), and the ejection mechanism (122) is suitable for passing through the through hole to eject the forged blank.

9. A forging method of a forging die without a typical parting surface according to any one of claims 1 to 8, characterized in that: include: Switching at least two of the side molds (102) from the separation position to the bonding position; placing the blank in the mold cavity; Switching the mold sleeve (104) from the disengaged position to the pressed position; The upper die core (106) is driven to forge the blank.

10. The forging method of a forging die having a typical parting surface according to claim 9, characterized in that: After the step of driving the upper die core (106) to forge the blank, the method further comprises: Switching the mold sleeve (104) from the pressing position to the disengaging position; Switching at least two of the side molds (102) from the bonding position to the separation position; Take out the forged blank.

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