An adjustable die for forging the sun gear in terms of length

Abstract

The present invention relates to a mold, in particular to a mold with adjustable length for forging a sun gear. By stacking a plurality of auxiliary plate molds, a cylindrical forging cavity is formed after the circular cavities in the auxiliary plate molds are stacked, so as to meet the forging processing requirements of the shaft part of the sun gear. And according to the length of the shaft to be forged, the adjustment can be achieved by adjusting the number of auxiliary plate molds. According to the diameter of the shaft part, different-caliber circular cavities can be replaced to meet the processing requirements. That is, when the diameters of the shaft parts are the same, the auxiliary plate molds with the same-caliber circular cavities are stacked. If the diameter of the shaft part is stepped, the auxiliary plate molds with circular cavities of corresponding calibers are replaced. When the length adjustment work is carried out in this solution, the set adjustment shroud assembly can be disassembled, that is, to avoid the limiting cover body from hindering the work of adding auxiliary plate molds, thereby improving the convenience and operation safety of the adjustment work.

Description

Technical Field

[0001] The present invention relates to a mold, and more particularly to a mold with adjustable length for forging a sun gear. Background Art

[0002] The existing Chinese authorized patent document with the publication number CN106111870A discloses a forging mold for gears and its forging process. In the solution, for the forging of the first gear blank, the size of the gear steel blank is determined according to the target gear. After blanking, it is heated to 1150 ± 50 °C, upset, and then placed into the gear blank mold to forge and fill the mold cavity to obtain the first gear blank, and the first gear blank is immediately sent to the initial forging mold.

[0003] For the forging and processing work of gear shaft components in the prior art and the above solution, after obtaining the gear shaft blank, it is placed in a forging and forming mold for forging and processing. However, the existing sun gear molds are dedicated to specific shafts and their lengths are not adjustable. When forging shafts with different specifications and lengths, corresponding molds need to be replaced, which delays the forging time and the replacement of the molds is rather troublesome.

[0004] Furthermore, after retrieval, the Chinese authorized patent with the publication number CN212419484U discloses a forging mold for a gear shaft. The solution includes an upper mold, a left mold, and a right mold. The left mold and the right mold have the same structure and are symmetrically arranged axially, and a cavity is formed in the middle. The left mold and the right mold both include a base, a fixing frame, and a plurality of half modules. The fixing frame is arranged on the base and includes a bottom plate, a push plate, and a combined rod. The push plate is vertically arranged at the edge of the bottom plate. There is a groove on the bottom plate. Threads are provided at the lower end of the combined rod and in the groove. The combined rod is perpendicular to the bottom plate through the groove and is threadedly connected. Through holes are provided on the half modules and the half modules are arranged on the fixing frame through the through holes. The edges of the half modules are semicircular and the diameters of the plurality of half modules are different. The upper mold includes a top plate and a cutting plate. A tooth-shaped cavity is provided at the center of the cutting plate. Embedded grooves are respectively provided at both ends of the cutting plate and coaxial with the combined rod, and springs are fixedly connected inside. This solution forms a forging cavity by stacking multiple groups of half modules to meet the forging and processing of gear shaft parts. The stacked and spliced half modules also have a length adjustment effect on the length of their bearings. However, during the length adjustment process, generally, the half modules need to be taken out one by one, and then selected according to the length of the shaft and the diameters of each part of the shaft, and finally stacked and assembled. And during the work of taking out the half modules, if it is necessary to add or replace the bottommost half module, for convenience, the staff generally tilts the forging bottom mold to pour out all the half modules. The operation is troublesome and has certain risks. Moreover, the half modules may also be damaged to a certain extent, and its length adjustment work has poor flexibility.

[0005] Therefore, the present invention proposes a mold with adjustable length for forging a sun gear to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a forging sun gear length adjustable die to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: A forging sun gear length adjustable die, including a bottom die base and a top die body. A support platform body is fixedly arranged on the top of the bottom die base. Positioning thread groove bodies are symmetrically arranged on the support platform body. Guide hole bodies are symmetrically arranged in the top die body, and a receiving groove is arranged at the bottom side of the guide hole bodies. A tooth-shaped cavity is arranged at the bottom side of the top die body;

[0008] A connecting through cavity is arranged through the support platform body, and the support platform body is connected with an adjusting shroud assembly. A cavity adjusting assembly is placed on the support platform body, and a processing part is placed in the cavity adjusting assembly.

[0009] Preferably, the adjusting shroud assembly includes a limiting shroud body, mounting hole bodies, first connecting screw grooves, splicing frame bars, connecting through holes, mounting screws, second connecting screw grooves, connecting shaft rods, fastening threads and connecting fastening nuts; Mounting hole bodies are symmetrically arranged at both ends of the limiting shroud body. Fastening threads are symmetrically arranged on the outer side walls at both ends of the connecting shaft rod, and the fastening threads are threadedly connected with the connecting fastening nuts in a matching manner.

[0010] Preferably, first connecting screw grooves are symmetrically arranged on both sides of the top end of the limiting shroud body. Connecting through holes are arranged on one pair of symmetrically arranged sides at the top of the splicing frame bar, and second connecting screw grooves are arranged on the other pair of symmetrically arranged sides.

[0011] Preferably, a circular groove is arranged at the top hole position of the connecting through hole. The connecting through hole and the first connecting screw groove at the top of the limiting shroud body are arranged at corresponding positions and in the same number of sets, and their diameters are equal. The splicing frame bar and the limiting shroud body are fixedly connected by the arranged mounting screws.

[0012] Preferably, the cavity adjusting assembly includes an auxiliary plate die, a circular cavity groove, through guide holes, auxiliary annular clamping grooves and an adjusting auxiliary mechanism; A circular cavity groove is arranged at the central position of the auxiliary plate die, and through guide holes are symmetrically arranged in the auxiliary plate die.

[0013] Preferably, the through guide holes and the positioning thread groove bodies on the support platform body are arranged at corresponding positions and in the same number of sets, and their diameters are equal. Auxiliary annular clamping grooves are equidistantly arranged on the inner side wall of the through guide holes.

[0014] Preferably, an adjustment auxiliary mechanism is inserted into the through guide hole. The adjustment auxiliary mechanism includes a guide rod body, a positioning thread, a connection thread, a pressing nut, a placement cavity, a driving rod body, a movable pressing head, a connection spring, a connection ring member, and a clamping structure. A positioning thread is provided on the outer side wall of the bottom end of the guide rod body, and the positioning thread is threadedly connected to the positioning thread groove body in a matching manner. A connection thread is provided on the outer side wall of the upper part of the guide rod body, and the connection thread is threadedly connected to the pressing nut in a matching manner. An activity slot is provided in the guide rod body, and a placement cavity is provided at one end of the activity slot. A driving rod body is movably inserted into the activity slot. A movable pressing head is fixedly provided at one end of the driving rod body, and a spherical surface head is provided at the other end of the driving rod body. The movable pressing head is movably arranged in the placement cavity.

[0015] Preferably, the pressing nut is provided as an internal thread ring body, and the pressing nut corresponds to the accommodating groove at the bottom of the top die body in terms of setting position and has the same number of sets.

[0016] Preferably, a connection spring is fixedly provided at the end of the movable pressing head connected to the driving rod body, and the other end of the connection spring is fixedly provided with a connection ring member.

[0017] Preferably, a clamping structure is provided in the guide rod body. The clamping structure includes a movable pin shaft, a clamping joint, and an auxiliary spring. The movable pin shaft is symmetrically and movably inserted into the guide rod body, and one end of the movable pin shaft extends into the activity slot and is provided with a spherical surface head at the end. A clamping joint is fixedly provided at the other end of the movable pin shaft. The clamping joint is movably inserted into a cylindrical groove body. The cylindrical groove body is provided at the side position of the guide rod body. An auxiliary spring is fixedly provided at the end of the clamping joint connected to the movable pin shaft, and the other end of the auxiliary spring is fixedly provided in the cylindrical groove body. The clamping joint is provided as a cylindrical member, and the diameter of the end of the clamping joint is equal to the width of the notch of the auxiliary annular clamping groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The forging die for the sun gear shaft component designed by the present invention comprises a bottom die base and a top die main body. A support platform body is fixedly arranged on the top of the bottom die base, and positioning threaded groove bodies are symmetrically arranged on the support platform body. Guide hole bodies are symmetrically arranged in the top die main body, and a receiving groove is arranged at the bottom side of the guide hole bodies. A tooth-shaped cavity is arranged at the bottom side of the top die main body. Among them, a connecting through cavity is arranged through the support platform body, and the support platform body is connected with an adjusting shroud assembly. A cavity adjusting assembly is placed on the support platform body, and a processing component is placed in the cavity adjusting assembly. On the one hand, in this solution, multiple auxiliary plate dies are stacked. The circular cavities in the auxiliary plate dies form a cylindrical forging cavity after stacking, so as to meet the forging processing requirements of the sun gear shaft part. Moreover, according to the length of the shaft to be forged, the number of auxiliary plate dies can be adjusted to achieve the adjustment. Furthermore, according to the diameter of the shaft part, different-caliber circular cavities can be replaced to meet the processing requirements. That is, when the shaft diameters are the same, multiple auxiliary plate dies with the same-caliber circular cavities are stacked. If the shaft diameters are stepped, the auxiliary plate dies with circular cavities of corresponding calibers are replaced. On the other hand, when the length adjustment work is carried out in this solution, the arranged adjusting shroud assembly can be disassembled, that is, to avoid the limiting cover body from hindering the work of adding auxiliary plate dies, thereby improving the convenience and operation safety of the adjustment work. The arranged adjusting auxiliary mechanism can further improve the working flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an exploded schematic view of the connection of the die structure of the present invention;

[0021] Figure 2 is a schematic view of the connection of the bottom die base, the adjusting shroud assembly and the cavity adjusting assembly of the present invention;

[0022] Figure 3 is a schematic view of the connection of the structure of the top die main body of the present invention;

[0023] Figure 4 is a schematic view of the connection of the structure of the bottom die base of the present invention;

[0024] Figure 5 is an exploded schematic view of the connection of the structure of the adjusting shroud assembly of the present invention;

[0025] Figure 6 is Figure 5 an enlarged schematic view of the connection of the structure at A in

[0026] Figure 7 is a schematic view of the connection of the structure of the auxiliary plate die in the cavity adjusting assembly of the present invention;

[0027] Figure 8 is a schematic view of the connection of the structure of the auxiliary plate die of the present invention;

[0028] Figure 9For Figure 8 Schematic enlarged view of the structure connection at position B in

[0029] Figure 10 Schematic diagram of the structure connection of the adjustment auxiliary mechanism of the present invention;

[0030] Figure 11 For Figure 10 Schematic enlarged view of the structure connection at position C in

[0031] Figure 12 For Figure 10 Schematic enlarged view of the structure connection at position D in

[0032] In the figure: bottom die base 1, support platform body 11, positioning thread groove body 12, connecting through cavity 13, top die main body 2, tooth-shaped cavity 21, guiding hole body 22, accommodating groove 23, processing component 3, limiting cover body 401, mounting hole body 402, first connecting thread groove 403, splicing frame bar 404, connecting through hole 405, mounting screw 406, second connecting thread groove 407, connecting shaft rod 408, fastening thread 409, connecting fastening nut 410, auxiliary plate die 501, circular cavity 502, through guiding hole 503, auxiliary annular clamping groove 504, guiding rod body 601, positioning thread 602, connecting thread 603, pressing nut 604, placing cavity 605, driving rod body 606, movable pressing head 607, connecting spring 608, connecting ring part 609, movable pin shaft 701, clamping joint 702, auxiliary spring 703. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. For the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention. 。

[0034] Embodiment 1: Please refer to Figures 1 - 12 , a forging sun gear length-adjustable die, including a bottom die base 1 and a top die main body 2. A support platform body 11 is fixedly arranged on the top of the bottom die base 1. Positioning thread groove bodies 12 are symmetrically arranged on the support platform body 11. Guiding hole bodies 22 are symmetrically arranged in the top die main body 2. An accommodating groove 23 is arranged at the bottom side of the guiding hole body 22. A tooth-shaped cavity 21 is arranged at the bottom side of the top die main body 2. Among them, a connecting through cavity 13 is arranged through the support platform body 11. The support platform body 11 is connected to the adjustment enclosure assembly. A cavity adjustment assembly is placed on the support platform body 11. And a processing component 3 is placed in the cavity adjustment assembly.

[0035] On the one hand, in this solution, multiple auxiliary plate molds 501 are stacked. The circular cavities 502 in the auxiliary plate molds 501 form a cylindrical forging cavity after stacking, so as to meet the forging processing requirements of the shaft part of the sun gear. Moreover, according to the length of the shaft to be forged, the adjustment can be achieved by adjusting the number of auxiliary plate molds 501. Furthermore, according to the diameter of the shaft part, different-diameter circular cavities 502 can be replaced to meet the processing requirements. That is, when the diameters of the shaft parts are the same, the auxiliary plate molds 501 with circular cavities 502 of the same diameter are stacked. If the diameter of the shaft part is stepped, then the auxiliary plate molds 501 with circular cavities 502 of the corresponding diameter are replaced. On the other hand, when the length adjustment work is carried out in this solution, the set adjustment shroud assembly can be disassembled, that is, to avoid the limit cover body 401 from hindering the work of adding auxiliary plate molds 501, thereby improving the convenience of its adjustment work; the set adjustment auxiliary mechanism can further improve its work flexibility.

[0036] Among them, the set limit cover body 401 is detachable. That is, the limit cover body 401 is connected and fixed through the connecting shaft rod 408. The limit cover body 401 is sleeved on the side of the support platform body 11 on the bottom die base 1. When the bottom end of the limit cover body 401 contacts the bottom die base 1, the mounting hole body 402 arranged on the side of the limit cover body 401 is aligned with the connecting through cavity 13 in the support platform body 11. Then, the connecting shaft rod 408 is inserted from the mounting hole body 402 on one side of the limit cover body 401, and then passes through the connecting through cavity 13. Finally, the connecting shaft rod 408 passes out from the mounting hole body 402 on the other side of the limit cover body 401. Finally, the connecting fastening nut 410 is threadedly connected with the outer fastening threads 409 at both ends of the connecting shaft rod 408, and the connecting fastening nut 410 is tightened to complete the connection and fixing work of the limit cover body 401 and the support platform body 11.

[0037] In order to further improve the flexibility of the use of the limit cover body 401 and to cooperate with the addition and regulation of the auxiliary plate mold 501, this solution also sets a splicing frame strip 404 on the top of the limit cover body 401 for cooperative use, and the thickness of the splicing frame strip 404 is set to be equal to the thickness of the auxiliary plate mold 501. That is, the adjustment shroud assembly includes a limit cover body 401, mounting hole bodies 402, first connection screw grooves 403, splicing frame strips 404, connection through holes 405, mounting screws 406, second connection screw grooves 407, connection shaft rods 408, fastening threads 409 and connection fastening nuts 410; mounting hole bodies 402 are symmetrically arranged at both ends of the limit cover body 401, fastening threads 409 are symmetrically arranged on the outer side walls at both ends of the connection shaft rod 408, and the fastening threads 409 are threadedly connected with the connection fastening nuts 410 in an adapted manner; first connection screw grooves 403 are symmetrically arranged on both sides at the top of the limit cover body 401, connection through holes 405 are arranged on one pair of symmetric sides at the top of the splicing frame strip 404, and second connection screw grooves 407 are arranged on the other pair of symmetric sides; a circular groove is arranged at the top hole position of the connection through hole 405, the connection through holes 405 and the first connection screw grooves 403 at the top of the limit cover body 401 are arranged at corresponding positions and in the same number of sets, and the splicing frame strip 404 and the limit cover body 401 are fixedly connected by the provided mounting screws 406; among them, the splicing frame strip 404 and the limit cover body 401 are fixedly connected by the mounting screws 406, and the splicing frame strips 404 are also fixedly connected by the mounting screws 406.

[0038] The cavity adjusting component therein includes an auxiliary plate mold 501, a circular cavity groove 502, a through guide hole 503, an auxiliary annular clamping groove 504 and an adjusting auxiliary mechanism; a circular cavity groove 502 is arranged at the center position of the auxiliary plate mold 501, and through guide holes 503 are symmetrically arranged in the auxiliary plate mold 501; the through guide holes 503 and the positioning threaded groove bodies 12 on the support platform body 11 are arranged in corresponding positions, with the same number of sets, and their diameters are equal. The inner side wall of the through guide hole 503 is equidistantly provided with auxiliary annular clamping grooves 504; when it is necessary to add and replace the auxiliary plate mold 501 with different-diameter circular cavity grooves 502, if only the topmost auxiliary plate mold 501 is replaced or added at the topmost layer, there is no need to remove the limit cover 401. Directly loosen the compression nut 604, then put the corresponding auxiliary plate mold 501 on the upper guide rod 601, and then add the corresponding splicing frame bars 404; if it is the auxiliary plate mold 501 at the bottommost layer or a certain position in the middle, the limit cover 401 needs to be removed first. If it is very troublesome to take out the auxiliary plate molds 501 one by one and it is inconvenient to take them out, the limit cover 401 needs to be disassembled, and then the auxiliary plate mold 501 is replaced or added. That is, first loosen the connecting fastening nut 410 and take it off, and then draw out the connecting shaft rod 408, so that the connection and fixation between the limit cover 401 and the support platform body 11 can be released. Then take off the limit cover 401, and the stacked auxiliary plate molds 501 are exposed. Then, according to the actual processing requirements, the auxiliary plate mold 501 is replaced or added to improve its adjustment convenience. After the adjustment operation is completed, the limit cover 401 is installed and fixed again.

[0039] During the adjustment operation, after removing the limit cover 401, if the auxiliary plate mold 501 near the bottom side is to be adjusted, first, the guide rod 601 needs to be rotated to release its threaded connection with the positioning thread groove 12, and then the guide rod 601 is pulled out. Then, the auxiliary plate molds 501 at the upper positions are removed layer by layer, and the operation is relatively cumbersome. Therefore, in order to further improve its operation convenience, this solution sets up an adjustment auxiliary mechanism to further improve its operation convenience, that is, the adjustment auxiliary mechanism includes a guide rod 601, a positioning thread 602, a connection thread 603, a compression nut 604, a placement cavity 605, a driving rod 606, a movable pressing head 607, a connection spring 608, a connection ring 609 and a clamping structure; a positioning thread 602 is provided on the outer side wall of the bottom end of the guide rod 601, and the positioning thread 602 is threadedly connected with the positioning thread groove 12 in a matching manner. A connection thread 603 is provided on the outer side wall of the upper part of the guide rod 601, and the connection thread 603 is threadedly connected with the compression nut 604 in a matching manner. A movable slot is provided in the guide rod 601, and a placement cavity 605 is provided at one end of the movable slot. A driving rod 606 is movably inserted in the movable slot. A movable pressing head 607 is fixedly provided at one end of the driving rod 606, and a spherical surface head is provided at the other end of the driving rod 606. The movable pressing head 607 is movably arranged in the placement cavity 605; the compression nut 604 is provided as an internal thread ring body, and the compression nut 604 corresponds to the accommodating groove 23 at the bottom of the top mold body 2 in terms of setting position and has the same number of sets; a connection spring 608 is fixedly provided at the end of the movable pressing head 607 connected to the driving rod 606, and the other end of the connection spring 608 is fixedly provided with a connection ring 609; a clamping structure is provided in the guide rod 601, and the clamping structure includes a movable pin 701, a clamping head 702 and an auxiliary spring 703; the movable pins 701 are symmetrically and movably inserted in the guide rod 601, and one end of the movable pin 701 extends into the movable slot and a spherical surface head is provided at the end. A clamping head 702 is fixedly provided at the other end of the movable pin 701. The clamping head 702 is movably inserted in a cylindrical groove. The cylindrical groove is provided at the side position of the guide rod 601. An auxiliary spring 703 is fixedly provided at the end of the clamping head 702 connected to the movable pin 701, and the other end of the auxiliary spring 703 is fixedly provided in the cylindrical groove. The clamping head 702 is provided as a cylindrical member, and the diameter of the end of the clamping head 702 is equal to the width of the notch of the auxiliary annular clamping groove 504.

[0040] During the actual operation process, after releasing the extrusion of the top auxiliary plate mold 501 by the compression nut 604, rotate the guide rod body 601 to release the threaded connection between the guide rod body 601 and the positioning threaded groove body 12. Then, pull up the guide rod body 601. While pulling up the guide rod body 601, when the bottom end of the guide rod body 601 reaches the position where the auxiliary plate mold 501 needs to be replaced, press the movable pressure head 607 at the top end position of the guide rod body 601 with the thumb at this time. The movable pressure head 607 pushes the driving rod body 606 to move downward. Then, the bottom end of the driving rod body 606 squeezes one end of the movable pin shaft 701, and the movable pin shaft 701 then pushes the clamping joint 702 to move until the clamping joint 702 is stuck in the auxiliary annular clamping groove 504 at the corresponding position. After that, pull up the guide rod body 601 forcefully to simultaneously remove the auxiliary plate mold 501 in the upper position. Then, replace the auxiliary plate mold 501 that needs to be replaced, or add an auxiliary plate mold 501 at the position where it needs to be added. After the operation is completed, place and install the stack of removed auxiliary plate molds 501. That is, at this time, release the thumb from the movable pressure head 607. The movable pressure head 607 and the driving rod body 606 are reset under the elastic return of the connecting spring 608, thereby releasing the extrusion of the driving rod body 606 on the movable pin shaft 701. The movable pin shaft 701 and the clamping joint 702 are reset under the action of the auxiliary spring 703, that is, the clamping joint 702 is separated from the auxiliary annular clamping groove 504. Finally, press the guide rod body 601. After the bottom end of the guide rod body 601 reaches the position of the positioning threaded groove body 12, rotate the guide rod body 601 to connect it with the positioning threaded groove body 12 by thread. Then, rotate the compression nut 604 to compress the topmost auxiliary plate mold 501. Finally, install and fix the adjustment shroud assembly.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable mold for forging a sun gear in terms of length, comprising a bottom mold base (1) and a top mold main body (2). A support platform body (11) is fixedly arranged on the top of the bottom mold base (1). Positioning threaded groove bodies (12) are symmetrically arranged on the support platform body (11). Guide hole bodies (22) are symmetrically arranged in the top mold main body (2), and a receiving groove (23) is arranged at the bottom side of the guide hole bodies (22). A tooth-shaped cavity (21) is arranged at the bottom side of the top mold main body (2). It is characterized in that: A connecting through cavity (13) is arranged through the support platform body (11), and the support platform body (11) is connected with an adjusting shroud assembly. A cavity adjusting assembly is placed on the support platform body (11), and a processing part (3) is placed in the cavity adjusting assembly. The cavity adjusting assembly comprises an auxiliary plate mold (501), a circular cavity groove (502), a through guide hole (503), an auxiliary annular clamping groove (504) and an adjusting auxiliary mechanism. A circular cavity groove (502) is arranged at the central position of the auxiliary plate mold (501), and through guide holes (503) are symmetrically arranged in the auxiliary plate mold (501). An adjusting auxiliary mechanism is inserted into the through guide hole (503). The adjusting auxiliary mechanism comprises a guide rod body (601), a positioning thread (602), a connecting thread (603), a pressing nut (604), a placing cavity (605), a driving rod body (606), a movable pressing head (607), a connecting spring (608), a connecting ring part (609) and a clamping structure. An activity slot is arranged in the guide rod body (601), and a placing cavity (605) is arranged at one end of the activity slot. A driving rod body (606) is movably inserted into the activity slot. A movable pressing head (607) is fixedly arranged at one end of the driving rod body (606). A spherical surface head is arranged at the other end of the driving rod body (606). The movable pressing head (607) is movably arranged in the placing cavity (605). A clamping structure is arranged in the guide rod body (601). The clamping structure comprises a movable pin shaft (701), a clamping head (702) and an auxiliary spring (703). The movable pin shafts (701) are symmetrically and movably inserted into the guide rod body (601), and one end of the movable pin shaft (701) extends into the activity slot and a spherical surface head is arranged at the end part. A clamping head (702) is fixedly arranged at the other end of the movable pin shaft (701).

2. A length-adjustable die for forging a sun gear according to claim 1, characterized in that: The adjusting shroud assembly comprises a limiting shroud body (401), mounting hole bodies (402), a first connecting screw groove (403), splicing frame bars (404), connecting through holes (405), mounting screws (406), a second connecting screw groove (407), a connecting shaft rod (408), fastening threads (409) and connecting fastening nuts (410). Mounting hole bodies (402) are symmetrically arranged at both ends of the limiting shroud body (401). Fastening threads (409) are symmetrically arranged on the outer side walls at both ends of the connecting shaft rod (408). The fastening threads (409) are threadedly connected with the connecting fastening nuts (410) in a matching manner.

3. A length-adjustable die for forging a sun gear according to claim 2, characterized in that: On both sides of the top end of the limiting cover body (401), first connection screw grooves (403) are symmetrically arranged. On the top of the splicing frame bar (404), connection through holes (405) are arranged on one pair of symmetric sides, and second connection screw grooves (407) are arranged on the other pair of symmetric sides.

4. A mold for forging a sun gear with adjustable length according to claim 2, characterized in that: At the top orifice position of the connection through hole (405), a circular groove is arranged. The connection through hole (405) and the first connection screw groove (403) at the top of the limiting cover body (401) are arranged at corresponding positions and in the same number of sets. The splicing frame bar (404) and the limiting cover body (401) are fixedly connected by the installed screws (406).

5. A length-adjustable die for forging a sun gear according to claim 1, characterized in that: The through guide hole (503) and the positioning thread groove body (12) on the support table body (11) are arranged at corresponding positions and in the same number of sets, and their diameters are equal. Auxiliary annular card slots (504) are equidistantly arranged on the inner side wall of the through guide hole (503).

6. A length-adjustable die for forging a sun gear according to claim 1, characterized in that: On the outer side wall of the bottom end of the guide rod body (601), a positioning thread (602) is arranged, and the positioning thread (602) is threadedly connected with the positioning thread groove body (12) in a matching manner. On the outer side wall of the upper part of the guide rod body (601), a connection thread (603) is arranged, and the connection thread (603) is threadedly connected with the pressing nut (604) in a matching manner.

7. A mold for forging a sun gear with adjustable length according to claim 1, characterized in that: The pressing nut (604) is arranged as an internal thread ring body, and the pressing nut (604) and the accommodating groove (23) at the bottom of the top die body (2) are arranged at corresponding positions and in the same number of sets.

8. A length-adjustable die for forging a sun gear according to claim 1, characterized in that: At the end of the movable pressure head (607) connected to the driving rod body (606), a connection spring (608) is fixedly arranged, and the other end of the connection spring (608) is fixedly provided with a connection ring part (609).

9. A length-adjustable die for forging a sun gear according to claim 1, characterized in that: The clamping joint (702) is movably inserted into the cylindrical groove body. The cylindrical groove body is arranged at the side position of the guide rod body (601). At the end of the clamping joint (702) connected to the movable pin shaft (701), an auxiliary spring (703) is fixedly arranged, and the other end of the auxiliary spring (703) is fixedly arranged in the cylindrical groove body. The clamping joint (702) is arranged as a cylindrical part, and the diameter of the end of the clamping joint (702) is equal to the width of the notch of the auxiliary annular card slot (5).

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