Punching and trimming composite die for transmission intermediate shaft gear and using method

Abstract

The invention relates to a transmission intermediate shaft gear, and provides a punching and trimming composite die of a transmission intermediate shaft gear and a using method of the punching and trimming composite die in order to solve the problems that an existing punching and trimming die is low in production efficiency, large in labor amount and the like. An annular female die seat and a female die are arranged on the lower surface; opening grooves are symmetrically formed in the two sides of the annular female die base, a transverse plate capable of sliding up and down along the opening grooves transversely penetrates through the position between the two opening grooves, an ejector is arranged on the lower surface of the transverse plate, one end of a punch assembly is connected with the lower surface of the upper die base, and the other end of the punch assembly sequentially penetrates through the transverse plate and the ejector to extend downwards. The lower die assembly comprises a lower die base and a male die. Restraining pull rods are arranged at the positions, corresponding to the two ends of the transverse plate, of the lower die base correspondingly, and the transverse plate can slide up and down along the restraining pull rods and limit the movement stroke of the transverse plate during workpiece retreating. When the upper die assembly and the lower die assembly are completely closed, the transverse plate, the ejector, the forge piece and the male die are in rigid contact.

Description

Technical Field

[0001] The present invention relates to an intermediate shaft gear of a transmission, and more particularly to a punching and trimming composite die for an intermediate shaft gear of a transmission and a usage method thereof. Background Art

[0002] The intermediate shaft gear of the gearbox is an important component in an automobile gearbox. Its main function is to transmit the power of the engine to the output shaft of the transmission and the drive axle, thereby driving the wheels. During the forging process of the intermediate shaft gear of the gearbox, the currently used die cavity is formed by adding features such as punching flash and trimming flash on the basis of the forging drawing of the intermediate shaft gear of the transmission and scaling it proportionally by a certain thermal expansion amount. During the production of forgings, the production is usually carried out by first punching a central through hole, then trimming the edge, and then punching a weight-reducing hole. However, due to the large force when punching the weight-reducing hole, it is easy to cause large deformation of the forging. After punching the weight-reducing hole, correction is also required to eliminate the deformation of the forging. At this time, it is necessary to manually move the forging to other correction dies for correction, which undoubtedly increases the manual labor intensity, production cost and production risk.

[0003] Chinese Patent Application No. CN202220832854.6 discloses a trimming, punching and correcting composite die for a hub bearing. It realizes trimming, punching and correcting of the hub bearing through the mutual cooperation between the upper die assembly and the lower die assembly, effectively saving the production cost and improving the overall processing efficiency. However, the structures of the intermediate shaft gear of the gearbox and the hub bearing are completely different. The intermediate shaft gear of the gearbox has a weight-reducing groove and multiple weight-reducing holes, and a through hole is also provided in the middle. The processing focuses of the two are different, and the deformation amount and processing accuracy requirements generated during the forging process are different, making the processing technology complex. Therefore, it is necessary to seek a composite die that has the functions of punching, punching weight-reducing holes, trimming the edge and correcting the forging and is applicable to the intermediate shaft gear of the gearbox. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problems that the forging processing die of the existing intermediate shaft gear of the gearbox cannot complete the punching, punching weight-reducing holes, trimming the edge and forging correction procedures at the same time, the production efficiency is low, and the manual labor intensity is large, and to propose a punching and trimming composite die for an intermediate shaft gear of a transmission and a usage method thereof.

[0005] To achieve the above purpose, the technical solution proposed by the present invention is as follows:

[0006] A punching and trimming composite die for an intermediate shaft gear of a transmission, comprising an upper die assembly and a lower die assembly coaxially arranged on a press workbench, and is characterized in that:

[0007] The upper die assembly comprises an upper die seat and a punch assembly, wherein a dovetail is arranged on the upper surface of the upper die seat for connecting with the dovetail groove of the press; an annular die seat is arranged on the lower surface of the upper die seat, and a die is arranged on the lower surface of the annular die seat for trimming the forging; open grooves are symmetrically provided on both sides of the annular die seat, and a horizontal plate that can slide up and down along the two open grooves is passed across, and an ejector is arranged on the lower surface of the horizontal plate in the annular die seat, and the lower surface of the ejector is adapted to the upper surface of the forging; one end of the punch assembly is connected to the lower surface of the upper die seat, and the other end passes through the horizontal plate and the ejector in sequence and extends downward for punching the forging;

[0008] The lower die assembly includes a lower die base and a punch fixed on its upper surface, the upper surface of the punch being matched with the lower surface of the forging; restraint rods are respectively arranged at positions corresponding to the two ends of the cross plate on the lower die base, the top of the restraint rods passes through the corresponding ends of the cross plate, so that the cross plate can slide up and down along the restraint rods and limit the movement stroke of the cross plate when the part is ejected; when the upper die assembly moves down to be completely closed with the lower die assembly, there is rigid contact between the cross plate, the ejector, the forging and the punch.

[0009] Furthermore, a flash removal assembly is provided on the outer side of the punch for removing the flash from the outer side of the punch;

[0010] The flash removal assembly includes an annular flash removal plate and a plurality of springs evenly distributed on the lower die seat, the annular flash removal plate is sleeved on the outer circumference of the punch, and spring mandrels are arranged at positions on the annular flash removal plate corresponding to the plurality of springs, one end of the spring mandrel is connected to the annular flash removal plate, and the other end passes through the inner hole of the corresponding spring, which is used to position the spring to prevent it from being deflected or bent when compressed, and at the same time, there is a certain gap between the bottom of the spring mandrel and the lower die seat;

[0011] One end of each spring is arranged on the lower die seat, and the other end is in contact with the lower surface of the annular flash removal plate; when the spring is in a non-deformed state, the upper surface of the annular flash removal plate is flush with the upper surface of the punch.

[0012] Furthermore, at least two guide pillars are arranged at the edge of the lower mold base, and a guide sleeve is arranged at a position of the upper mold base corresponding to the guide pillars; when the upper mold base moves downward, the guide pillars extend into the guide sleeves, and the guide pillars and the guide sleeves cooperate with each other to form a guiding positioning for the upper mold assembly and the lower mold assembly.

[0013] Furthermore, a punch pressing ring is provided at the connection end between the punch assembly and the lower surface of the upper die seat, which is used to fix and press the punch assembly on the lower surface of the upper die seat;

[0014] When the upper die assembly moves down to be completely closed with the lower die assembly, there is a rigid contact between the punch ring, the cross plate, the ejector, the forging and the punch.

[0015] Further, the punch assembly includes a large punch and a plurality of small punches. One ends of the large punch and the plurality of small punches pass through the punch retaining ring and are fixedly connected to the lower surface of the upper die base by bolts. The setting position of the large punch corresponds to the position of the central through hole of the forging, and the setting positions of the plurality of small punches correspond one by one to the positions of the plurality of weight-reducing holes of the forging.

[0016] The other ends of the large punch and the plurality of small punches all extend downward through the cross plate and the ejector in sequence, and are used for punching the central through hole and the plurality of weight-reducing holes of the forging.

[0017] Further, at least one square key is arranged on the lower surface of the upper die base, and a first installation groove for installing the square key is arranged at the corresponding position on the upper surface of the punch retaining ring. The square key and the first installation groove are installed in cooperation with each other to form positioning for the punch assembly.

[0018] At least one square key is arranged on the upper surface of the lower die base, and a second installation groove for installing the square key is arranged at the corresponding position on the lower surface of the punch. The square key and the second installation groove are installed in cooperation with each other to form positioning for the punch and prevent it from rotating.

[0019] The setting positions of the square keys on the upper die base correspond one by one to the setting positions of the square keys on the lower die base.

[0020] The punch is fixed to the upper surface of the lower die base by a plurality of pressing plates.

[0021] Further, it further includes two U-shaped plates with openings facing upward; both ends of the cross plate located outside the opening groove are U-shaped structures arranged horizontally, and the opening ends of the two U-shaped plates are respectively connected to the opening ends of the corresponding U-shaped structures on the cross plate; a pull rod through hole is opened at the bottom of the U-shaped plate, and the top of the restraint pull rod passes through the corresponding pull rod through hole and is slidably matched with the inner wall of the pull rod through hole, so as to drive the U-shaped plate and the cross plate to move up and down along the restraint pull rod.

[0022] The restraint pull rod includes a pull rod and a restraint boss arranged at the top of the pull rod. The bottom of the pull rod is fixedly connected to the lower die base, and its top passes through the pull rod through hole and is connected to the restraint boss. The restraint boss is used to limit the movement of the U-shaped plate, thereby limiting the movement stroke of the cross plate.

[0023] Further, step through holes are opened at the positions of the punch opposite to the central through hole and the plurality of weight-reducing holes on the forging, and are used for guiding the web after punching to fall below the lower die base.

[0024] The present invention also proposes a usage method of a punching and trimming composite die for a transmission countershaft gear. By using the above-mentioned composite die for a transmission countershaft gear, the special feature lies in that it includes the following steps:

[0025] Step 1: Place the punching and trimming compound die on the press workbench. Install the dovetail on the upper die base in the corresponding dovetail groove of the press workbench. Fix the lower die base on the lower workbench of the press, and place the forging on the punch of the lower die base.

[0026] Step 2: Start the press to drive the upper die base to move downward. The upper die base drives the punch assembly, cross plate, and ejector to move downward.

[0027] Step 3: When the upper die assembly moves downward to be completely closed with the lower die assembly, the punch assembly completes the punching process of the forging, the die on the lower surface of the annular die seat completes the trimming process of the forging, and the rigid contact between the cross plate, ejector, forging, and punch completes the deformation correction of the forging.

[0028] Step 4: The press returns, driving the upper die base to move upward. The upper die base drives the punch assembly, cross plate, ejector, and forging to move upward. When the cross plate moves to the restraint position, the restraint pull rod restricts the cross plate from continuing to move upward, thereby restricting the ejector and forging from moving upward with the upper die base. The press continues to drive the upper die base and punch assembly upward until the forging is completely separated from the punch assembly, completing the ejection of the forging, and thus realizing the punching, trimming, and correction of the forging.

[0029] Further, Step 4 is specifically: Define the operating stroke when the upper die base moves upward as S, the effective stroke of the cross plate sliding up and down along the restraint pull rod as L1, and the height of the open slots on the opposite sides of the annular die seat as L2.

[0030] The press returns, driving the upper die base to move upward. The upper die base drives the punch assembly, cross plate, ejector, and forging to move upward along the restraint pull rod. When the cross plate moves to the restraint position of the restraint pull rod, that is, when S = L1, the restraint pull rod restricts the cross plate from continuing to move upward, thereby restricting the ejector and forging from moving upward with the upper die base. The press continues to drive the upper die base and punch assembly upward. At this time, the ejection stroke when the upper die base moves upward needs to satisfy S - L1 < L2, and at the same time, the forging and the punch assembly are completely separated to avoid the rigid contact between the cross plate and the annular die seat, ensuring that the forging is completely separated from the punch assembly to complete the ejection, and thus realizing the punching, trimming, and correction of the forging.

[0031] Advantages of the present invention:

[0032] 【1】The punching and trimming compound die for the intermediate shaft gear of the transmission in the present invention has a simple structure, high machining accuracy and finished product rate. It can realize the punching, trimming, and correction of the forging at one time, effectively improving the processing production efficiency. It not only reduces the manual labor intensity and production cost, but also effectively guarantees the production quality and machining accuracy.

[0033] 【2】The present invention can effectively ensure the effective correction of the forging through the rigid contact between the cross plate, the ejector, the forging and the punch, ensuring the correction accuracy and quality, and effectively improving the finished product rate of forging processing.

[0034] 【3】Through the mutual cooperation among the opening groove, the cross plate, the U-shaped plate and the pull rod, the present invention can not only ensure the effective ejection of the forging from the large punch and the small punch after punching and trimming, but also ensure the structural safety and production safety of the compound die.

[0035] 【4】By arranging an annular flash removing plate and a plurality of springs outside the punch, the present invention can effectively remove the flash sleeved outside the punch due to the action of thermal expansion and contraction, eliminating the need for manual operation to remove the flash again, and effectively saving manpower.

[0036] 【5】By arranging square keys on both the upper die base and the lower die base, the present invention can effectively ensure the installation accuracy of the punch retaining ring and the punch, and also play an anti-rotation function, effectively improving the assembly accuracy of the compound die, reducing the deviation caused by external forces during its use, ensuring the processing accuracy of the compound die, and improving the finished product rate of forging processing.

[0037] 【6】The guide pillar and guide sleeve structure adopted by the present invention effectively improves the installation accuracy and operation accuracy of the upper die assembly and the lower die assembly, thus ensuring the punching, trimming and correction accuracy of the forging.

[0038] 【7】The flash removing assembly of the present invention ensures the inner hole positioning of the spring through the spring mandrel, thus effectively preventing the spring from being skewed or bent when compressed, ensuring the trimming accuracy of the forging and the smoothness of forging flash removal. Description of the Drawings

[0039] Figure 1 is a schematic diagram of the closed structure of an embodiment of a punching and trimming compound die for an intermediate shaft gear of a transmission according to the present invention;

[0040] Figure 2 is a schematic diagram of the opened structure of the compound die in the embodiment of the present invention;

[0041] Figure 3 is a sectional view of the structure of the compound die in the embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of the structure of the upper die assembly in the embodiment of the present invention;

[0043] Figure 5 is a schematic diagram of the structure of the upper die assembly removing the annular die holder in the embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of the structure of the lower die assembly in the embodiment of the present invention;

[0045] Figure 7 It is a structural schematic diagram of removing the annular flash removal plate from the lower die assembly in an embodiment of the present invention;

[0046] Reference numerals:

[0047] 1- dovetail, 2- upper die seat, 3- large punch, 4- small punch, 5- punch pressure ring, 6- annular die seat, 7- guide sleeve, 8- U-shaped plate, 9- horizontal plate, 10- guide column, 11- ejector, 12- die, 13- punch, 14- annular flash removal plate, 15- pressure plate, 16- square key, 17- lower die seat, 18- tie rod through hole, 19- forging, 20- spring, 21- open groove, 22- restraining tie rod, 23- tie rod, 24- restraining boss, 25- spring mandrel. DETAILED DESCRIPTION

[0048] like Figures 1 to 3 As shown, a composite die for punching and trimming a transmission intermediate shaft gear comprises an upper die assembly and a lower die assembly coaxially arranged on a press workbench;

[0049] like Figure 4 and Figure 5 As shown, the upper die assembly includes an upper die base 2, a punch assembly and two U-shaped plates 8. The upper surface of the upper die base 2 is provided with a dovetail 1 for connecting with the corresponding dovetail groove on the press workbench. The press workbench drives the upper die assembly to move up and down; the lower surface is provided with an annular die base 6, and the lower surface of the annular die base 6 is provided with a die 12 for trimming the forging 19; U-shaped opening grooves 21 are provided on both opposite sides of the annular die base 6, and a horizontal plate 9 that can slide up and down along the two opening grooves 21 is passed across, and the horizontal plate 9 is located at the opening There are horizontally arranged U-shaped structures at both ends of the outer side of the slot 21, and the open ends of the two U-shaped plates 8 are respectively connected to the open ends of the corresponding U-shaped structures on the horizontal plate 9; a tie rod through hole 18 is opened at the bottom of the U-shaped plate 8, and the top of the constraint tie rod 22 passes through the corresponding tie rod through hole 18, and can slide with the inner wall of the tie rod through hole 18, thereby driving the U-shaped plate 8 and the horizontal plate 9 to move up and down along the constraint tie rod 22; an ejector 11 is arranged on the lower surface of the horizontal plate 9 in the annular die seat 6, and the lower surface of the ejector 11 is adapted to the upper surface of the forging 19;

[0050] In this embodiment, a central through-hole is provided at the center of the forging 19 to be processed, and six weight-reducing through-holes are evenly distributed along the outer circumferential surface of the central through-hole. The punch assembly includes a large punch 3 and six small punches 4. One ends of the large punch 3 and the six small punches 4 are fixedly connected to the lower surface of the upper die holder 2 by bolts. The setting position of the large punch 3 corresponds to the position of the central through-hole of the forging 19, and the setting positions of the six small punches 4 correspond one by one to the positions of the six weight-reducing holes of the forging 19. The other ends of the large punch 3 and the six small punches 4 all extend downward through the cross plate 9 and the ejector 11 in sequence, and are used for punching the central through-hole and the six weight-reducing holes of the forging 19. A punch retaining ring 5 is also provided at the connection end of the punch assembly and the lower surface of the upper die holder 2, and is used for fixedly pressing the punch assembly on the lower surface of the upper die holder 2. When the upper die holder 2 moves downward, the annular die holder 6, the punch assembly, and the die 12 can be regarded as a whole. At least one square key 16 is provided on the lower surface of the upper die holder 2, and a first installation groove for installing the square key 16 is provided on the upper surface of the punch retaining ring 5. The square key 16 and the first installation groove are installed in cooperation with each other for positioning the punch assembly. If the forging 19 to be processed does not need to be punched, the punching assembly can be removed to realize the trimming and straightening functions of the forging 19 to be processed.

[0051] As Figure 6 and Figure 7As shown in the figure, the lower die assembly includes a lower die base 17 and a punch 13 fixed to its upper surface by a plurality of pressing plates 15. The upper surface of the punch 13 is adapted to the lower surface of the forging 19. An edge-removing component is arranged outside the punch 13 and is used to remove the flash from the outside of the punch 13 after trimming. The edge-removing component includes an annular edge-removing plate 14 and a plurality of springs 20 evenly distributed on the lower die base 17. The annular edge-removing plate 14 is sleeved on the outer circumference of the punch 13. Spring mandrels 25 are arranged at positions corresponding to the plurality of springs 20 on the annular edge-removing plate 14. One end of the spring mandrel 25 is connected to the annular edge-removing plate 14, and the other end passes through the inner hole of the corresponding spring 20 to position the spring 20 and prevent it from being skewed or bent when compressed. At the same time, there is a certain gap between the bottom of the spring mandrel 25 and the bottom of the lower die base 17, which is used to reserve the movement space between the spring mandrel 25 and the lower die base 17 when the annular edge-removing plate 14 and the spring mandrel 25 move downward together. One end of each spring 20 is fixed to the lower die base 17, and the other end abuts against the lower surface of the annular edge-removing plate 14. When the spring 20 is in an undeformed state, the upper plane of the annular edge-removing plate 14 connected to the upper end of the spring 20 is flush with the upper plane of the punch 13. When the upper die assembly moves downward, the female die 12 trims the forging 19. When the upper die assembly continues to move downward, the female die 12 presses the flash and thus presses the annular edge-removing plate 14 to continue moving downward, compressing the spring 20. After trimming, due to the effect of thermal expansion and contraction, the flash is sleeved on the outer ring of the punch 13. When the upper die assembly moves upward, the flash and the annular edge-removing plate 14 move upward under the reaction force of the spring 20, thereby forcing the flash to be removed from the outer ring of the punch 13.

[0052] At least one square key 16 is arranged on the upper surface of the lower die base 17, and a second installation groove for installing the square key 16 is arranged on the lower surface of the punch 13. The square key 16 and the second installation groove are installed in cooperation to position the punch 13 and prevent it from rotating. The setting positions of the square keys 16 on the upper die base 2 correspond one by one to the setting positions of the square keys 16 on the lower die base 17.

[0053] At positions on the lower die base 17 corresponding to the through holes 18 of the two pull rods, restraint pull rods 22 are provided. The restraint pull rod 22 includes a pull rod 23 and a restraint boss 24 provided at the top of the pull rod 23. The bottom of the pull rod 23 is fixedly connected to the lower die base 17, and its top passes through the through hole 18 of the pull rod and is connected to the U-shaped plate 8. The U-shaped plate 8 can slide up and down along the pull rod 23, thereby driving the cross plate 9 to slide up and down. The restraint boss 24 is used to limit the movement stroke of the U-shaped plate 8, thereby limiting the movement stroke of the cross plate 9; at positions on the upper die base 2 corresponding to the two restraint bosses 24, two boss grooves are also provided to prevent the upper die base 2 from affecting the movement of the restraint pull rod 22. When the upper die assembly and the lower die assembly are completely closed, there is a rigid contact between the punch retainer 5, the cross plate 9, the ejector 11, the forging 19, and the punch 13, so that the forging 19 can be effectively and accurately corrected, effectively improving the machining accuracy and the yield rate of the forging 19.

[0054] At the edge of the lower die base 17, two guide pillars 10 are provided. At positions on the edge of the upper die base 2 corresponding to the guide pillars 10, guide sleeves 7 are provided; when the upper die base 2 moves downward, the guide pillars 10 extend into the guide sleeves 7. The guide pillars 10 and the guide sleeves 7 cooperate with each other to form guiding and positioning for the upper die assembly and the lower die assembly. When the upper die assembly and the lower die assembly are completely closed, the top of the guide pillar 10 is located inside the guide sleeve 7; at positions on the punch 13 corresponding to the central through hole and the six weight-reducing holes on the forging 19, stepped through holes are opened to guide the slug after punching to fall below the lower die base 17, ensuring the cleanliness of the die surface.

[0055] This embodiment also proposes a method for using a punching and trimming compound die for a transmission countershaft gear, including the following steps:

[0056] Step 1: Place the multi-functional correction compound die on the press workbench. Install the dovetail 1 on the upper die base 2 in the corresponding dovetail groove on the press workbench. Fix the lower die base 17 on the lower workbench, and place the forging 19 on the punch 13 of the lower die base 17.

[0057] Step 2: Start the press to drive the upper die base 2 to move downward. The upper die base 2 drives the punch assembly, the cross plate 9, and the ejector 11 to drive the U-shaped plate 8 to move downward along the restraint pull rod 22.

[0058] Step 3: When the upper die assembly moves downward to be completely closed with the lower die assembly, the punch assembly completes the punching process for the forging 19. The slug after punching passes through the stepped through holes opened at positions on the punch 13 corresponding to the central through hole and the six weight-reducing holes on the forging 19 and falls below the lower die base 17.

[0059] The die 12 on the lower surface of the annular die holder 6 completes the trimming process of the forging 19. The die 12 presses the flash, thus pressing the annular flash-removing plate 14 to continue moving downward and compressing the spring 20. After the trimming is completed, due to the effect of thermal expansion and contraction, the flash is now sleeved on the outer ring of the punch 13. The rigid contact between the cross plate 9, the ejector 11, the forging 19 and the punch 13 realizes the correction of the forging 19.

[0060] Step Four: Define the operating stroke when the upper die holder 2 moves upward as S, the effective stroke for the U-shaped plate 8 to slide up and down along the restraining rod 22 as L1, and the height of the open slots 21 on the opposite sides of the annular die holder 6 as L2.

[0061] The press returns. The press drives the upper die holder 2 to move upward. The upper die holder 2 drives the punch assembly, the cross plate 9, the ejector 11, the forging 19 and the U-shaped plate 8 to move upward along the restraining rod 22. The flash and the annular flash-removing plate 14 move upward under the reaction force of the spring 20, thus forcing the flash to disengage from the outer ring of the punch 13. When the U-shaped plate 8 moves to the top of the restraining rod 22, that is, when S = L1, the restraining rod 22 restricts the U-shaped plate 8 from continuing to move upward, thereby restricting the cross plate 9, the ejector 11 and the forging 19 from moving upward with the upper die holder 2. The press continues to drive the upper die holder 2 and the punch assembly to move upward. At this time, the stripping stroke when the upper die holder 2 moves upward needs to satisfy S – L1 < L2, and at the same time, the forging 19 and the punch assembly are completely separated, so as to avoid the rigid contact between the cross plate 9 and the annular die holder 6, ensure the integrity of the composite die structure and the safety of processing, and ensure that the forging 19 is completely separated from the punch assembly to complete stripping. Then the worker can take away the flash and the forging 19, thus realizing the punching, trimming and correction of the forging 19.

Claims

1. A composite die for punching and trimming a transmission intermediate shaft gear, comprising an upper die assembly and a lower die assembly coaxially arranged on a press workbench, characterized in that: The upper die assembly comprises an upper die seat (2) and a punch assembly, wherein the upper surface of the upper die seat (2) is provided with a dovetail (1) for connecting with a dovetail groove of a press machine; the lower surface of the upper die seat (2) is provided with an annular die seat (6), and the lower surface of the annular die seat (6) is provided with a die (12) for trimming the forged piece (19); the two sides of the annular die seat (6) are symmetrically provided with open grooves (21), a horizontal plate (9) is passed between the two open grooves (21) and can slide up and down along the horizontal plate (9), and an ejector (11) is provided on the lower surface of the horizontal plate (9) in the annular die seat (6), and the lower surface of the ejector (11) is adapted to the upper surface of the forged piece (19); one end of the punch assembly is connected to the lower surface of the upper die seat (2), and the other end passes through the horizontal plate (9) and the ejector (11) in sequence and extends downward, and is used for punching the forged piece (19); The lower die assembly comprises a lower die base (17) and a punch (13) fixed on its upper surface, the upper surface of the punch (13) being matched with the lower surface of the forging (19); restraining rods (22) are respectively arranged at positions corresponding to the two ends of the cross plate (9) on the lower die base (17), the top of the restraining rod (22) passes through the corresponding end of the cross plate (9), so that the cross plate (9) can slide up and down along the restraining rod (22) and limit the movement stroke of the cross plate (9) when the part is ejected; when the upper die assembly moves down to be completely closed with the lower die assembly, there is rigid contact between the cross plate (9), the ejector (11), the forging (19) and the punch (13).

2. The punching and trimming composite die for the intermediate shaft gear of a transmission according to claim 1, characterized in that: The outer side of the punch (13) is provided with a flash removal assembly for removing the flash from the outer side of the punch (13); The flash removal assembly comprises an annular flash removal plate (14) and a plurality of springs (20) uniformly distributed on a lower die seat (17); the annular flash removal plate (14) is sleeved on the outer circumference of the punch (13); spring mandrels (25) are arranged at positions corresponding to the plurality of springs (20) on the annular flash removal plate (14); one end of the spring mandrel (25) is connected to the annular flash removal plate (14), and the other end passes through the inner hole of the corresponding spring (20) for positioning the spring (20) to prevent the spring (20) from being deflected or bent when compressed; and a certain gap exists between the bottom of the spring mandrel (25) and the lower die seat (17); One end of each of the springs (20) is arranged on the lower die seat (17), and the other end is in contact with the lower surface of the annular flash removal plate (14); when the spring (20) is in a non-deformed state, the upper surface of the annular flash removal plate (14) is flush with the upper surface of the punch (13).

3. The punching and trimming composite die for the intermediate shaft gear of a transmission according to claim 2, characterized in that: At least two guide pillars (10) are arranged at the edge of the lower die seat (17), and a guide sleeve (7) is arranged at a position of the upper die seat (2) corresponding to the guide pillars (10); when the upper die seat (2) moves downward, the guide pillars (10) extend into the guide sleeve (7), and the guide pillars (10) and the guide sleeve (7) cooperate with each other to form a guiding and positioning for the upper die assembly and the lower die assembly.

4. A punching and trimming composite die for a transmission intermediate shaft gear according to any one of claims 1 to 3, characterized in that: A punch pressing ring (5) is also provided at the connection end between the punch assembly and the lower surface of the upper die seat (2), and is used to fix and press the punch assembly onto the lower surface of the upper die seat (2); When the upper die assembly moves downward to be completely closed with the lower die assembly, the punch ring (5), the cross plate (9), the ejector (11), the forging (19) and the punch (13) are in rigid contact with each other.

5. The punching and trimming composite die for the intermediate shaft gear of a transmission according to claim 4, characterized in that: The punch assembly comprises a large punch (3) and a plurality of small punches (4), one end of the large punch (3) and the plurality of small punches (4) pass through a punch pressing ring (5) and are fixedly connected to the lower surface of the upper die seat (2) by bolts, the setting position of the large punch (3) corresponds to the position of the central through hole of the forging (19), and the setting positions of the plurality of small punches (4) correspond one-to-one to the positions of the plurality of weight-reducing holes of the forging (19); The other ends of the large punch (3) and the plurality of small punches (4) successively pass through the transverse plate (9) and the ejector (11) and extend downward, and are used to punch the central through hole and the plurality of weight-reducing holes of the forging (19).

6. The punching and trimming composite die for the intermediate shaft gear of a transmission according to claim 5, characterized in that: The lower surface of the upper die seat (2) is provided with at least one square key (16), and a first mounting groove for mounting the square key (16) is provided at a corresponding position on the upper surface of the punch pressing ring (5), and the square key (16) and the first mounting groove are installed in cooperation with each other to form a positioning for the punch assembly; The upper surface of the lower die seat (17) is provided with at least one square key (16), and a second mounting groove for mounting the square key (16) is provided at a corresponding position on the lower surface of the punch (13), and the square key (16) and the second mounting groove are mounted in cooperation with each other to position the punch (13) and prevent it from rotating; The setting position of the square key (16) on the upper die seat (2) corresponds to the setting position of the square key (16) on the lower die seat (17); The male die (13) is fixed on the upper surface of the lower die base (17) via a plurality of pressing plates (15).

7. The punching and trimming composite die for the intermediate shaft gear of a transmission according to claim 6, characterized in that: It also includes two U-shaped plates (8) with openings facing upwards; both ends of the transverse plate (9) located outside the opening groove (21) are horizontally arranged U-shaped structures, and the open ends of the two U-shaped plates (8) are respectively connected to the open ends of the corresponding U-shaped structures on the transverse plate (9); a pull rod through hole (18) is provided at the bottom of the U-shaped plate (8), and the top of the restraining pull rod (22) passes through the corresponding pull rod through hole (18) and can be slidably matched with the inner wall of the pull rod through hole (18), thereby driving the U-shaped plate (8) and the transverse plate (9) to move up and down along the restraining pull rod (22); The restraining pull rod (22) includes a pull rod (23) and a restraining boss (24) arranged on the top of the pull rod (23). The bottom of the pull rod (23) is fixedly connected to the lower mold base (17), and the top of the pull rod passes through the pull rod through hole (18) and is connected to the restraining boss (24). The restraining boss (24) is used to limit the movement of the U-shaped plate (8), thereby limiting the movement range of the cross plate (9).

8. The punching and trimming composite die for the intermediate shaft gear of a transmission according to claim 7, characterized in that: The punch (13) is provided with stepped through holes at positions opposite to the central through hole and the plurality of lightening holes on the forging (19), for guiding the punched skin to fall below the lower die seat (17).

9. A method for using a composite die for punching and trimming a transmission intermediate shaft gear, using the composite die for punching and trimming a transmission intermediate shaft gear as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Place the punching and trimming composite die on the workbench of the press, install the dovetail (1) on the upper die seat (2) in the dovetail groove corresponding to the workbench of the press, fix the lower die seat (17) on the lower workbench of the press, and place the forging (19) on the punch (13) of the lower die seat (17); Step 2: Start the press, so that the press drives the upper die base (2) to move downward, and the upper die base (2) drives the punch assembly, the cross plate (9) and the ejector (11) to move downward; Step 3: When the upper die assembly moves downward to be completely closed with the lower die assembly, the punch assembly completes the punching process of the forging (19), the die (12) on the lower surface of the annular die seat (6) completes the trimming process of the forging (19), and the rigid contact between the cross plate (9), the ejector (11), the forging (19) and the punch (13) completes the deformation correction of the forging (19); Step 4, the press machine returns, the press machine drives the upper die base (2) to move upward, and the upper die base (2) drives the punch assembly, the cross plate (9), the ejector (11) and the forging (19) to move upward; when the cross plate (9) moves to the restraining position, the restraining rod (22) restricts the cross plate (9) from continuing to move upward, thereby restricting the ejector (11) and the forging (19) from moving upward with the upper die base (2), and the press machine continues to drive the upper die base (2) and the punch assembly to move upward until the forging (19) is completely separated from the punch assembly, completing the withdrawal of the forging (19), thereby realizing the punching, trimming and correction of the forging (19).

10. The method for machining a transmission intermediate shaft gear according to claim 9, characterized in that: Step 4 is as follows: The running stroke of the upper die seat (2) when it moves upward is defined as S, the effective stroke of the horizontal plate (9) sliding up and down along the restraining rod (22) is defined as L1, and the height of the opening grooves (21) on the opposite sides of the annular die seat (6) is defined as L2; During the return stroke of the press, the press drives the upper die seat (2) to move upward, and the upper die seat (2) drives the punch assembly, the cross plate (9), the ejector (11) and the forging (19) to move upward along the restraining rod (22); when the cross plate (9) moves to the restraining position of the restraining rod (22), that is, S=L1, the restraining rod (22) restricts the cross plate (9) from continuing to move upward, thereby restricting the ejector (11) and the forging (19) from moving upward with the upper die seat (2), and the press continues to drive the upper die seat (2) and the punch assembly to move upward. At this time, the withdrawal stroke of the upper die seat (2) during upward movement needs to satisfy S-L1<L2, and at the same time, the forging (19) and the punch assembly are completely separated to avoid rigid contact between the cross plate (9) and the annular die seat (6), ensuring that the forging (19) is completely separated from the punch assembly to complete the withdrawal, thereby achieving punching, trimming and correction of the forging (19).

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