A stamping die for cylindrical stamping parts

Abstract

The present invention belongs to the field of stamping technology, and in particular, relates to a stamping die for a cylindrical stamping part, which includes a top die, a bottom die, and a base, wherein the top die is installed on a press; the bottom die is installed on the upper side of the base; the stamping die designed by the present invention can easily remove the stamping part without flipping the bottom die after the stamping is completed and the top die moves up; compared with the traditional stamping die with a flipping mechanism and a pushing structure, the stamping die designed by the present invention greatly reduces the cost of the die. The present invention has a certain locking effect on the four bottom die assemblies after tightening through the threaded cooperation of the tightening rod and the threaded sleeve, preventing the fan-shaped side plates of the four bottom die assemblies from being stretched outward after being subjected to lateral forces during the stamping process, thereby affecting the stamping effect. The present invention has a further locking effect on the tightening rod through the cooperation of the worm and the worm wheel.

Description

Technical Field

[0001] The invention belongs to the field of stamping technology, and in particular relates to a stamping die for a cylindrical stamping part. Background Art

[0002] Stamping is a pressure processing method that uses the cooperation of a top die installed on a press and a bottom die installed on a base to apply pressure to the material, causing it to separate or plastically deform, thereby obtaining the desired parts.

[0003] When a traditional stamping die is used to make cylindrical stamping parts, after the stamping parts are stamped and formed, the bottom die needs to be flipped 180 degrees by a flipping mechanism installed on the base so that the upper end of the bottom die faces downward, that is, the open end of the formed stamping part faces downward, and the stamping part is removed from the bottom die by its own gravity. However, since there is a certain friction resistance between the stamping part and the bottom die, the stamping part is not easy to fall off the bottom die. Therefore, some molds are provided with a shell pushing structure on the base. After the bottom die carrying the stamping part is flipped 180 degrees, the stamping part is pushed downward from the upper side by the pushing structure so that the stamping part is removed from the bottom die.

[0004] The present invention designs a stamping die which can easily remove the stamping part from the bottom die without turning over the bottom die to solve the above problem.

[0005] The present invention designs a stamping die for a cylindrical stamping part to solve the above problems. Summary of the invention

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A stamping die for a cylindrical stamping part comprises a top die, a bottom die and a base. The top die is installed on a press machine; the bottom die is installed on the upper side of the base.

[0008] The bottom mold comprises a mounting plate and four bottom mold assemblies mounted on the mounting plate in a radial direction and slidingly arranged thereon. The four bottom mold assemblies are evenly distributed circumferentially on the mounting plate. The mounting plate is mounted on the upper side of the base.

[0009] The bottom mold assembly includes a fan-shaped bottom plate and a fan-shaped side plate installed on the upper side of the fan-shaped bottom plate, a fastening arc plate is fixedly installed on the lower side of the fan-shaped bottom plate, a limiting arc plate is fixedly installed on the inner arc surface of the fastening arc plate, and the fan-shaped bottom plate is slidably installed on the upper side of the mounting plate along the radial direction of the mounting plate; an arc-shaped notch is opened near the center of the fan-shaped bottom plate; after the four bottom mold assemblies are closed, the arc-shaped notches opened on the four fan-shaped bottom plates form a complete circular hole; a second motor for controlling the opening and closing of the four bottom mold assemblies is installed on the upper side of the mounting plate.

[0010] A fixing sleeve is fixedly installed on the upper side of the base, the sliding rod is a hollow structure, a positioning ring is fixedly installed on the lower end of the sliding rod, and the lower end of the sliding rod is slidably installed in the fixing sleeve; a transmission ring and a limit ring are fixedly installed on the upper end of the sliding rod in sequence from bottom to top, a fastening sleeve is slidably installed on the sliding rod, a piston is slidably installed in the sliding rod, and the piston is fixedly connected to the fastening sleeve; a spring is installed between the transmission ring and the fastening sleeve; a transmission sleeve is slidably installed on the outer side of the sliding rod, and a hydraulic rod is installed between the transmission sleeve and the base; the inner diameter of the fastening sleeve is equal to the outer diameter of the four fastening arc plates after the four bottom mold assemblies are closed; the limit ring cooperates with the four limit arc plates on the four bottom mold assemblies.

[0011] As a preferred solution, the mounting plate is fixedly mounted on the upper side of the base through four symmetrically distributed support plates; four groups of trapezoidal slide grooves are evenly opened circumferentially on the upper end surface of the mounting plate; an avoidance groove that runs through from top to bottom is opened between two trapezoidal slide grooves in each group; two trapezoidal sliders are symmetrically fixedly mounted on the lower side of the outer arc surface of the fan-shaped side plate; the bottom mold assembly is mounted on the upper side of the mounting plate through the sliding cooperation of the corresponding two trapezoidal sliders and the trapezoidal slide grooves opened on the mounting plate.

[0012] As a preferred solution, a tightening rod is fixedly installed on the outer arc surface of the fan-shaped side plate in each of the bottom mold assemblies, and the tightening rod has an external thread on the end away from the fan-shaped side plate; four threaded sleeves are rotatably installed on the upper side of the mounting plate through two third supports respectively, and the four threaded sleeves correspond one by one to the four tightening rods installed on the four fan-shaped side plates in the four bottom mold assemblies and are threadedly connected; a second gear is fixedly installed on each of the threaded sleeves, and a gear ring is rotatably installed on the upper side of the mounting plate through a plurality of evenly distributed guide supports, and the gear ring is meshed with the four second gears; a worm wheel and a first gear are coaxially rotatably installed on the upper side of the mounting plate through a second support, and the first gear is meshed with the gear ring; the second motor is fixedly installed on the upper side of the mounting plate, and the worm is fixedly installed on the output shaft of the second motor, and the worm is meshed with the worm wheel.

[0013] As a preferred solution, a fourth support for supporting the worm is installed on the mounting plate.

[0014] As a preferred solution, two guide grooves are symmetrically opened on the upper end of the sliding rod, the limit ring and the transmission ring are respectively located on the upper and lower sides of the guide grooves, and two guide blocks are symmetrically fixedly installed on the inner side of the fastening sleeve. The fastening sleeve is installed on the sliding rod through the sliding cooperation of the two guide blocks and the two guide grooves, and the piston is fixedly connected to one end of the two guide blocks extending into the sliding rod.

[0015] As a preferred solution, a circular column is fixedly installed on the inner side of the upper end of the sliding rod, and the circular column is provided with evenly distributed air holes.

[0016] As a preferred solution, an elastic pad is fixedly mounted on the upper end of the sliding rod.

[0017] As a preferred solution, the upper end of the transmission sleeve has an inward convex ring, the inner diameter of which is smaller than the outer diameter of the transmission ring; a square plate is fixedly mounted on the outer circular surface of the lower end of the transmission sleeve, and the hydraulic rod is installed between the square plate and the base.

[0018] The stamping parts transmission mechanism used for the above-mentioned stamping die includes a belt, a pulley, a first motor, and a first support, wherein four pulleys are rotatably mounted on the upper side of the base through four first supports, two sections of belts are symmetrically mounted on the four pulleys, and a notch area is provided between the two sections of belts for the sliding rod, the transmission sleeve and the fastening sleeve to pass through; the first motor is fixedly mounted on one of the first supports and the output shaft of the first motor is fixedly connected to the rotating shaft of one of the pulleys.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. The stamping die designed in the present invention can easily remove the stamped parts after the stamping is completed and the top die is moved up, without turning over the bottom die; compared with the traditional stamping die with added turning mechanism and pushing structure, the stamping die designed in the present invention greatly reduces the cost of the die.

[0021] 2. In the present invention, the movement direction of the four bottom mold assemblies when opening and closing is the radial direction of the mounting disk, that is, the bottom mold assemblies make lateral movements along the radial direction of the mounting disk during opening and closing. Such movement mode can ensure the smooth opening of the four bottom mold assemblies for some bottom mold assemblies with relatively complex internal structures; that is, the mold designed in the present invention can be used to stamp some stamping parts with relatively complex internal structures.

[0022] 3. Since the threaded fit has a certain self-locking function for the screw and the threaded sleeve, the present invention has a certain locking effect on the four bottom die assemblies after tightening through the threaded fit of the tightening rod and the threaded sleeve, preventing the fan-shaped side plates of the four bottom die assemblies from being pushed outward by the lateral force during the stamping process, thereby affecting the stamping effect. The present invention further locks the tightening rod through the fit of the worm and the worm wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall appearance of the components.

[0024] Figure 2 It is a schematic diagram of the distribution of the stamping parts conveying mechanism.

[0025] Figure 3 It is a schematic diagram of the structure of the stamping parts transmission mechanism.

[0026] Figure 4 This is a schematic diagram of the hydraulic rod installation.

[0027] Figure 5 This is a schematic diagram of the sliding rod installation.

[0028] Figure 6 This is a schematic diagram of the transmission sleeve installation.

[0029] Figure 7 It is a schematic diagram of the sliding rod structure.

[0030] Figure 8 It is a schematic diagram of the transmission sleeve structure.

[0031] Fig. 9 This is a piston installation diagram.

[0032] Fig.10 It is a schematic diagram of the tightening rod distribution.

[0033] Fig.11 It is a schematic diagram of the tightening rod drive.

[0034] Fig.12 This is a schematic diagram of the installation of the bottom mold assembly.

[0035] Fig.13 It is a schematic diagram of the bottom mold assembly structure.

[0036] Names of the reference numerals in the figure: 1. top die; 2. stamping part transmission mechanism; 3. hydraulic rod; 4. base; 5. support plate; 6. belt; 7. pulley; 8. first motor; 9. first support; 10. tightening rod; 11. bottom die; 12. fixing sleeve; 13. sliding rod; 14. mounting plate; 15. second motor; 16. tightening sleeve; 17. spring; 18. transmission sleeve; 19. gear ring; 20. round column; 21. limit ring; 22. elastic pad; 23. piston; 24. square plate; 25. guide Slide groove; 26, transmission ring; 27, convex ring; 28, guide block; 29, guide support; 30, second support; 31, third support; 32, fourth support; 33, threaded sleeve; 34, worm gear; 35, worm; 36, first gear; 37, second gear; 38, trapezoidal slide groove; 39, trapezoidal slider; 40, bottom mold assembly; 41, avoidance groove; 42, arc-shaped notch; 43, limiting arc plate; 44, fastening arc plate; 45, fan-shaped bottom plate; 46, fan-shaped side plate; 47, positioning ring; 48, notch area. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples or drawings are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0038] A stamping die for a cylindrical stamping part, such as Figure 1 , 4, 5, 10, it includes a top die 1, a base 4, a hydraulic rod 3, a tightening rod 10, a bottom die 11, a fixing sleeve 12, a sliding rod 13, a mounting plate 14, a second motor 15, a fastening sleeve 16, a spring 17, a transmission sleeve 18, and a piston 23, wherein as Figure 1 As shown, the mounting plate 14 is fixedly mounted on the upper side of the base 4 through four symmetrically distributed support plates 5, as shown in FIG. Fig.12 As shown, the upper end surface of the mounting plate 14 is evenly provided with four groups of trapezoidal slide grooves 38 in the circumferential direction, and an escape groove 41 extending vertically is provided between two trapezoidal slide grooves 38 in each group of trapezoidal slide grooves 38; Fig.11 , 13 As shown, the bottom mold 11 is composed of four bottom mold components 40, such as Fig.13 As shown, the bottom mold assembly 40 includes a fan-shaped bottom plate 45 and a fan-shaped side plate 46 installed on the upper side of the fan-shaped bottom plate 45, a fastening arc plate 44 is fixedly installed on the lower side of the fan-shaped bottom plate 45, and a limiting arc plate 43 is fixedly installed on the inner arc surface of the fastening arc plate 44; two trapezoidal sliders 39 are symmetrically fixedly installed on the lower side of the outer arc surface of the fan-shaped side plate 46; the bottom mold assembly 40 is installed on the upper side of the mounting plate 14 through the sliding cooperation of the corresponding two trapezoidal sliders 39 and the trapezoidal slide grooves 38 opened on the mounting plate 14; the fan-shaped bottom plate 45 has an arc-shaped notch 42 near the center; when the four bottom mold assemblies 40 are closed, the arc-shaped notches 42 opened on the four fan-shaped bottom plates 45 form a complete circular hole.

[0039] The function of the four avoidance grooves 41 opened on the mounting plate 14 in the present invention is that when the four bottom mold assemblies 40 are opened outward, the fastening arc plates 44 and the limiting arc plates 43 installed on the lower side of the fan-shaped bottom plate 45 in the four bottom mold assemblies 40 will move to the corresponding avoidance grooves 41 and will not contact the inner wall of the mounting plate 14, that is, the mounting plate 14 will not affect the opening of the bottom mold assembly 40.

[0040] When the four bottom mold assemblies 40 of the present invention are closed, the fan-shaped side plates 46 in two adjacent bottom mold assemblies 40 are in close contact with each other, and the fan-shaped bottom plates 45 in two adjacent bottom mold assemblies 40 are in close contact with each other.

[0041] In the present invention, the movement direction of the four bottom mold assemblies 40 when opening and closing is the radial direction of the mounting plate 14, that is, the bottom mold assemblies 40 make lateral movements along the radial direction of the mounting plate 14 during opening and closing. Such movement mode can ensure that the four bottom mold assemblies 40 are opened smoothly even for some bottom mold assemblies 40 with relatively complex internal structures; that is, the mold designed in the present invention can be used to stamp some stamping parts with relatively complex internal structures.

[0042] like Fig.13As shown, a tightening rod 10 is fixedly mounted on the outer arc surface of the fan-shaped side plate 46 in each of the bottom mold assemblies 40, and the end of the tightening rod 10 away from the fan-shaped side plate 46 has an external thread; Fig.10 , 11 As shown, four threaded sleeves 33 are rotatably mounted on the upper side of the mounting plate 14 through two third supports 31 respectively. The four threaded sleeves 33 correspond to the four tightening rods 10 mounted on the four fan-shaped side plates 46 in the four bottom mold assemblies 40 and are threadedly connected; each of the threaded sleeves 33 is fixedly mounted with a second gear 37, as shown in FIG. Fig.10 , 11 As shown, the gear ring 19 is rotatably mounted on the upper side of the mounting disk 14 through a plurality of evenly distributed guide supports 29, and the gear ring 19 is meshed with four second gears 37; a worm wheel 34 and a first gear 36 are coaxially rotatably mounted on the upper side of the mounting disk 14 through a second support 30, and the first gear 36 is meshed with the gear ring 19; the second motor 15 is fixedly mounted on the upper side of the mounting disk 14, and the worm 35 is fixedly mounted on the output shaft of the second motor 15, and the worm 35 is meshed with the worm wheel 34, and a fourth support 32 for supporting the worm 35 is installed on the mounting disk 14.

[0043] When the second motor 15 is working, it will drive the worm 35 to rotate, the rotation of the worm 35 drives the worm wheel 34 to rotate, the rotation of the worm wheel 34 drives the first gear 36 to rotate, the rotation of the first gear 36 drives the gear ring 19 to rotate, the rotation of the gear ring 19 drives the four second gears 37 to rotate, the rotation of the four second gears 37 drives the four threaded sleeves 33 to rotate, the four threaded sleeves 33 rotate under the action of the thread, the four tightening rods 10 slide inward and outward relative to the threaded sleeves 33 along the radial direction of the mounting plate 14, thereby controlling the opening and closing of the four bottom mold assemblies 40.

[0044] Since the threaded fit has a certain self-locking function for the screw and the threaded sleeve, the present invention plays a certain locking role on the four bottom die assemblies 40 after tightening through the threaded fit of the tightening rod 10 and the threaded sleeve 33, preventing the fan-shaped side plates 46 of the four bottom die assemblies 40 from being pushed outward by the lateral force during the stamping process, thereby affecting the stamping effect. The present invention plays a further locking role on the tightening rod 10 through the fit of the worm 35 and the worm wheel 34.

[0045] like Figure 4 As shown, a fixing sleeve 12 is fixedly installed on the upper side of the base 4, and the lower end of the hollow sliding rod 13 is slidably installed in the fixing sleeve 12, and a positioning ring 47 is fixedly installed on the lower end of the sliding rod 13; Figure 7As shown, the upper end of the sliding rod 13 is symmetrically provided with two guide slots 25, a transmission ring 26 is fixedly installed on the lower side of the guide slot 25, a limit ring 21 is fixedly installed on the outer side of the upper end of the sliding rod 13, a circular column 20 is fixedly installed on the inner side of the upper end of the sliding rod 13, and the circular column 20 has evenly distributed air holes; an elastic pad 22 is fixedly installed on the upper end of the sliding rod 13; Fig. 9 As shown, two guide blocks 28 are symmetrically fixedly mounted on the inner side of the fastening sleeve 16. Figure 6 As shown, the fastening sleeve 16 is installed on the sliding rod 13 through the sliding cooperation of two guide blocks 28 and two guide slots 25. A piston 23 is slidably installed in the sliding rod 13. The piston 23 is fixedly connected to one end of the two guide blocks 28 extending into the sliding rod 13; Figure 6 As shown, a spring 17 is installed between the transmission ring 26 and the fastening sleeve 16; a transmission sleeve 18 is slidably installed on the outer side of the sliding rod 13, and the upper end of the transmission sleeve 18 has an inward convex ring 27, and the inner diameter of the convex ring 27 is smaller than the outer diameter of the transmission ring 26; Figure 8 As shown, a square plate 24 is fixedly installed on the outer circular surface of the lower end of the transmission sleeve 18, and a hydraulic rod 3 is installed between the square plate 24 and the base 4; the inner diameter of the fastening sleeve 16 is equal to the outer diameter of the four fastening arc plates 44 after the four bottom mold assemblies 40 are closed; the limiting ring 21 cooperates with the four limiting arc plates 43 on the four bottom mold assemblies 40.

[0046] The top die 1 is installed on a press.

[0047] like Figure 1 , 2 As shown in Figures 3 and 4, a stamping parts conveying mechanism 2 is installed on the upper side of the base 4.

[0048] like Figure 3 As shown, the stamping part conveying mechanism 2 includes a belt 6, a pulley 7, a first motor 8, and a first support 9, wherein four pulleys 7 are rotatably mounted on the upper side of the base 4 through four first supports 9, two sections of belt 6 are symmetrically mounted on the four pulleys 7, and a notch area 48 is provided between the two sections of belt 6 through which the sliding rod 13, the transmission sleeve 18 and the fastening sleeve 16 pass; the first motor 8 is fixedly mounted on one of the first supports 9 and the output shaft of the first motor 8 is fixedly connected to the rotating shaft of one of the pulleys 7.

[0049] In the present invention, the adsorption force of the piston 23 on the stamping part when it moves downward is relatively small. This adsorption force can ensure that the stamping part will not be deviated when the four bottom mold assemblies 40 move outward. Moreover, this adsorption force can ensure that the stamping part can be easily removed from the sliding rod 13 after being blocked by the belt 6.

[0050] Implementation method: When the stamping die used in the present invention is used, when not in use, the hydraulic rod 3 is in the shortest state, the upper end of the sliding rod 13 is located at the lower side of the four bottom die assemblies 40, the spring 17 is in the shortest state, and the lower end surface of the convex ring 27 on the transmission sleeve 18 contacts the upper end surface of the transmission ring 26; when in use, the hydraulic rod 3 is first extended, and the upper end of the hydraulic rod 3 drives the transmission sleeve 18 to move upward through the square plate 24. When the transmission sleeve 18 moves up to the convex ring 27 on it and contacts the lower end surface of the fastening sleeve 16, the transmission sleeve 18 will drive the fastening sleeve 16 to move upward, and the fastening sleeve 16 is in contact with the lower end surface of the fastening sleeve 16. The transmission ring 26 is driven upward by the spring 17, and the upward movement of the transmission ring 26 drives the sliding rod 13 to move upward. During the upward movement, when the positioning ring 47 at the lower end of the sliding rod 13 moves to contact the inner end surface of the fixed sleeve 12, the fixed sleeve 12 limits the positioning ring 47, that is, the fixed sleeve 12 limits the upward movement of the sliding rod 13, and the upper end surface of the sliding rod 13 is slightly lower than the upper end surfaces of the four fan-shaped bottom plates 45 in the four bottom mold assemblies 40, and the elastic pad 22 installed at the upper end of the sliding rod 13 is slightly higher than the upper end surfaces of the four fan-shaped bottom plates 45 in the four bottom mold assemblies 40; the limiting ring 21 is located at the four The upper side of the limiting arc plate 43 on the lower side of the four fan-shaped bottom plates 45 in the bottom mold assembly 40 is flush with the lower end surface of the limiting arc plate 43, and the upper end of the fastening sleeve 16 is located on the lower side of the four fastening arc plates 44; then, the four bottom mold assemblies 40 are controlled by the second motor 15 to move toward the middle, so that the four limiting arc plates 43 move to the lower side of the limiting ring 21, and the bottom surface of the fan-shaped bottom plate 45 is tightly fitted with the upper end surface of the limiting ring 21; when the four bottom mold assemblies 40 are moved to be completely closed, the hydraulic rod 3 is controlled to continue to push the transmission sleeve 18 upwards. At this time, due to the sliding The lower end of the rod 13 is limited, and the sliding rod 13 cannot continue to move upward, so at this time the upward movement of the transmission sleeve 18 will push the fastening sleeve 16 to move upward relative to the sliding rod 13, and the spring 17 is stretched. The upper end of the fastening sleeve 16 is nested in the outer side of the four fastening arc plates 44 to limit the outward movement of the four fastening arc plates 44, that is, it has a limiting effect on the lower ends of the four bottom mold assemblies 40 to prevent the lower ends of the bottom mold assemblies 40 from being stretched outward by external force; at the same time, the four limiting arc plates 43 in the four bottom mold assemblies 40 cooperate with the limiting ring 21 to limit the downward movement of the sliding rod 13.

[0051] During the stamping process, the lower end of the stamping piece will press the elastic pad 22, causing the elastic pad 22 to be compressed.

[0052] After the stamping is completed and the top die 1 moves upward, the hydraulic rod 3 is first controlled to shorten. At this time, the four limiting arc plates 43 in the four bottom die assemblies 40 limit the limiting ring 21 installed on the sliding rod 13, and the sliding rod 13 cannot move downward. Therefore, the hydraulic rod 3 is shortened at this time. Under the action of the spring 17, the fastening sleeve 16 will move downward relative to the sliding rod 13 first. The fastening sleeve 16 moves downward and drives the piston 23 to move downward through the two guide blocks 28. At this time, the stamping part is close to the upper end of the sliding rod 13. During the downward movement of the piston 23, negative pressure will be formed in the space above the sliding rod 13. At this time, the elastic pad 22 plays a sealing role; Under the action of negative pressure, the stamping part is adsorbed on the upper end of the sliding rod 13; when the fastening sleeve 16 is completely moved to the lower side of the four bottom die assemblies 40 to release the limit on the lower end of the bottom die assembly 40, the second motor 15 is controlled to work, so that the four bottom die assemblies 40 move outward to open and make room for the stamping assembly to move downward; then the hydraulic rod 3 is controlled to continue to shorten. At this time, because the four limiting arc plates 43 in the four bottom die assemblies 40 have lost the limit on the sliding rod 13, the convex ring 27 on the transmission sleeve 18 will drive the sliding rod 13 to move downward after contacting the transmission ring 26 on the sliding rod 13, and the sliding rod 13 drives the stamping part to move downward.

[0053] After the sliding rod 13 drives the stamping part to move down to contact the two sections of the belt 6, the sliding rod 13, the transmission sleeve 18 and the fastening sleeve 16 continue to move down through the notch area 48, while the stamping part is blocked by the belt 6 and disengaged from the sliding rod 13 and remains on the belt 6, and is taken out by the rotating belt 6 for collection.

[0054] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A stamping die for a cylindrical stamping part, comprising a top die, a bottom die, and a base, characterized in that: The top die is mounted on a press; the bottom die is mounted on the upper side of the base; The bottom mold comprises a mounting plate and four bottom mold assemblies mounted on the mounting plate in a radial direction and slidingly arranged thereon, wherein the four bottom mold assemblies are evenly distributed circumferentially on the mounting plate; the mounting plate is mounted on the upper side of the base; The bottom mold assembly comprises a fan-shaped bottom plate and a fan-shaped side plate installed on the upper side of the fan-shaped bottom plate, a fastening arc plate is fixedly installed on the lower side of the fan-shaped bottom plate, a limiting arc plate is fixedly installed on the inner arc surface of the fastening arc plate, and the fan-shaped bottom plate is slidably installed on the upper side of the mounting plate along the radial direction of the mounting plate; an arc-shaped notch is opened near the center of the fan-shaped bottom plate; after the four bottom mold assemblies are closed, the arc-shaped notches opened on the four fan-shaped bottom plates form a complete circular hole; a second motor for controlling the opening and closing of the four bottom mold assemblies is installed on the upper side of the mounting plate; A fixing sleeve is fixedly installed on the upper side of the base, the sliding rod is a hollow structure, a positioning ring is fixedly installed on the lower end of the sliding rod, and the lower end of the sliding rod is slidably installed in the fixing sleeve; a transmission ring and a limit ring are fixedly installed on the upper end of the sliding rod in sequence from bottom to top, a fastening sleeve is slidably installed on the sliding rod, a piston is slidably installed in the sliding rod, and the piston is fixedly connected to the fastening sleeve; a spring is installed between the transmission ring and the fastening sleeve; a transmission sleeve is slidably installed on the outer side of the sliding rod, and a hydraulic rod is installed between the transmission sleeve and the base; the inner diameter of the fastening sleeve is equal to the outer diameter of the four fastening arc plates after the four bottom mold assemblies are closed; the limit ring cooperates with the four limit arc plates on the four bottom mold assemblies.

2. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: The mounting plate is fixedly mounted on the upper side of the base by means of four symmetrically distributed support plates; four groups of trapezoidal slide grooves are evenly opened circumferentially on the upper end surface of the mounting plate; an escape groove which passes through from top to bottom is opened between two trapezoidal slide grooves in each group of trapezoidal slide grooves; two trapezoidal sliding blocks are symmetrically fixedly mounted on the lower side of the outer arc surface of the fan-shaped side plate; the bottom mold assembly is mounted on the upper side of the mounting plate by means of the sliding cooperation of the corresponding two trapezoidal sliding blocks and the trapezoidal slide grooves opened on the mounting plate.

3. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: A tightening rod is fixedly installed on the outer arc surface of the fan-shaped side plate in each of the bottom mold assemblies, and the tightening rod has an external thread on the end away from the fan-shaped side plate; four threaded sleeves are rotatably installed on the upper side of the mounting plate through two third supports respectively, and the four threaded sleeves correspond to the four tightening rods installed on the four fan-shaped side plates in the four bottom mold assemblies one by one and are threadedly connected; a second gear is fixedly installed on each of the threaded sleeves, and a gear ring is rotatably installed on the upper side of the mounting plate through a plurality of evenly distributed guide supports, and the gear ring is meshed with the four second gears; a worm wheel and a first gear are coaxially rotatably installed on the upper side of the mounting plate through a second support, and the first gear is meshed with the gear ring; the second motor is fixedly installed on the upper side of the mounting plate, and the worm is fixedly installed on the output shaft of the second motor, and the worm is meshed with the worm wheel.

4. The stamping die for a cylindrical stamping part according to claim 3, characterized in that: The mounting plate is provided with a fourth support for supporting the worm.

5. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: The upper end of the sliding rod is symmetrically provided with two guide grooves, the limit ring and the transmission ring are respectively located on the upper and lower sides of the guide grooves, and two guide blocks are symmetrically fixedly installed on the inner side of the fastening sleeve. The fastening sleeve is installed on the sliding rod through the sliding cooperation of the two guide blocks and the two guide grooves, and the piston is fixedly connected to one end of the two guide blocks extending into the sliding rod.

6. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: A round column is fixedly installed on the inner side of the upper end of the sliding rod, and evenly distributed air holes are opened on the round column.

7. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: An elastic pad is fixedly mounted on the upper end of the sliding rod.

8. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: The upper end of the transmission sleeve has an inward convex ring, and the inner diameter of the convex ring is smaller than the outer diameter of the transmission ring; a square plate is fixedly installed on the outer circular surface of the lower end of the transmission sleeve, and the hydraulic rod is installed between the square plate and the base.

9. The stamping die for a cylindrical stamping part according to claim 1, characterized in that: It also includes a transmission mechanism, which includes a belt, a pulley, a first motor, and a first support, wherein four pulleys are rotatably mounted on the upper side of the base through four first supports, two sections of belts are symmetrically mounted on the four pulleys, and a notch area is provided between the two sections of belts for the sliding rod, the transmission sleeve, and the fastening sleeve to pass through; the first motor is fixedly mounted on one of the first supports, and the output shaft of the first motor is fixedly connected to the rotating shaft of one of the pulleys.

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