Stamping die of transmission shaft and using method of stamping die

Abstract

The invention provides a stamping die of a transmission shaft and a using method of the stamping die, and belongs to the technical field of stamping dies. The multiple supporting rods are fixedly connected to the four corners of the upper end of the base correspondingly; the top plate is fixedly connected to the upper ends of the multiple limiting rods; the air cylinder is fixedly connected into the top plate, and an extension rod is slidably connected into the air cylinder; the mold assembly comprises a lower mold, an upper mold and a sliding module, the lower mold is fixedly connected into the base, the upper mold is arranged on the upper side of the lower mold, and the sliding module is slidably connected into the lower mold; by using the device, different stamping modes are switched for different transmission shaft materials, when the device is used for coping with complex deformation or high-resilience materials, the device is switched to a compensation stamping mode, and the problem that the size of a formed part is out of tolerance or an additional shaping procedure is needed is effectively avoided through the buffer assembly and self-adaption to material thickness fluctuation or compensation resilience.

Description

Technical Field

[0001] The present invention belongs to the technical field of stamping dies, and particularly relates to a stamping die for a drive shaft and its usage method. Background Art

[0002] The stamping die for a drive shaft is a key tool for producing drive shaft components in the fields of automobile manufacturing and machining. Its design and manufacturing level directly affect the quality, precision, and production efficiency of the drive shaft. As a core component for power transmission, the drive shaft is usually composed of components such as a shaft tube, a universal joint fork, and a flange plate. Most of these components are formed by stamping processes. Therefore, the structural optimization and process adaptation of the stamping die are crucial. The stamping die mainly consists of an upper die, a lower die, a guiding mechanism, an ejection device, and a die base, etc. It is made of high-strength alloy steel such as Cr12MoV or SKD11, and is heat-treated and surface-treated to improve wear resistance and fatigue resistance. When designing, factors such as the plastic deformation characteristics of the material, the blanking clearance, the die strength, and the service life need to be comprehensively considered. For example, for the forming of a universal joint fork, a multi-station progressive die or a compound die structure is usually adopted to complete multiple processes such as punching, blanking, and bending in one stroke, significantly improving production efficiency. The precision requirements of the die are extremely high, and the dimensional tolerances of the working parts are often controlled within ±0.01 mm. The guiding mechanism mostly selects the form of ball guide pillars or guide plates to ensure the movement stability. For different requirements of drive shaft components, the stamping die may involve special processes such as deep drawing, fine blanking, or hot stamping. For example, when forming the shaft tube, attention needs to be paid to controlling the drawing ratio and the blank-holding force to avoid wrinkling and cracking. Modern die design widely uses CAD / CAE software for simulation analysis, and optimizes the die cavity structure and process parameters by finite element simulation of the metal flow law. In addition, under the trend of intelligentization, sensors are beginning to be integrated into the die to real-time monitor the punching force and temperature, and combined with an adaptive control system to achieve dynamic process adjustment. In terms of maintenance, the cutting edge wear needs to be regularly checked, the chip accumulation needs to be cleaned, and the moving parts need to be lubricated to extend the service life of the die. With the increasing demand for lightweight, the popularization of aluminum alloy or high-strength steel drive shafts puts higher requirements on the die. For example, when stamping high-strength steel, the problem of springback control needs to be solved, which promotes the development of die surface coating technology and compensation machining technology. In short, the stamping die for a drive shaft is a precision equipment integrating mechanical design, materials science, and manufacturing technology. Its technological progress plays a decisive role in improving the performance of the drive shaft and reducing production costs.

[0003] In the prior art, the stamping die for a drive shaft usually adopts a rigid structure design. Such a rigid die has certain limitations when dealing with complex deformation or high springback materials, and it is difficult to adapt to material thickness fluctuations or compensate for springback, resulting in out-of-tolerance part dimensions after forming or the need for additional sizing processes. Summary of the Invention

[0004] The purpose of the present invention is to provide a stamping die for a drive shaft and its usage method, aiming to solve the problem that the stamping die for a drive shaft in the prior art usually adopts a rigid structure design. Such a rigid die has certain limitations when dealing with complex deformation or high springback materials, and it is difficult to adapt to material thickness fluctuations or compensate for springback, resulting in out-of-tolerance part dimensions after forming or the need for additional shaping processes.

[0005] To achieve the above object, the present invention provides the following technical solutions: A stamping die for a drive shaft, comprising: A base; Support rods, of which there are multiple, and the multiple support rods are respectively fixedly connected to the four corners of the upper end of the base; A top plate, which is fixedly connected to the upper ends of the multiple limiting rods; A cylinder, which is fixedly connected inside the top plate, and an extension rod is slidably connected inside the cylinder; A die assembly, which includes a lower die, an upper die and a sliding module. The lower die is fixedly connected inside the base, the upper die is arranged above the lower die, and the sliding module is slidably connected inside the lower die; Buffer assemblies, of which there are two groups, and both groups of buffer assemblies are connected to the upper die; A connecting plate, which connects the two groups of buffer assemblies; A rotation control assembly, which includes a second positioning groove, a first positioning groove, a rotating seat, a rotating block, a stamping rod, a positioning plate, a convex block, a Y-shaped channel, a corrugated air pipe and a second control valve. There are two corrugated air pipes, two positioning plates and two convex blocks. The rotating block is fixedly connected to the lower end of the extension rod, and the two convex blocks are both fixedly connected to the circumferential surface of the rotating block. The rotating seat is rotatably connected to the surface of the rotating block, the stamping rod is fixedly connected to the lower end of the rotating seat, and the two positioning plates are both fixedly connected to the circumferential surface of the stamping rod. The first positioning groove is opened in the connecting plate, the second positioning groove is opened at the upper end of the upper die, and the first positioning groove and the second positioning groove respectively match the two positioning plates. The Y-shaped channel is opened in the extension rod, and the two corrugated air pipes are respectively connected to the Y-shaped channel and the inside of the rotating seat. The Y-shaped channel is connected to the cylinder, and the second control valve is installed in the extension rod and is connected to the Y-shaped channel.

[0006] As a preferred embodiment of the present invention, each of the buffer assemblies includes a slide rail, a track rod, a track block, a connecting rod, a spring, and a U-shaped seat. The U-shaped seat is fixedly connected to the upper end of the upper mold. The slide rail is fixedly connected to one end of the connecting plate. The track rod is fixedly connected to the inner wall of the slide rail. The track block is slidably connected to the circumferential surface of the track rod. Two ends of the spring are respectively fixedly connected to one end of the track block and one side inner wall of the slide rail. The connecting rod is rotatably connected to the surface of the track block and is rotatably connected within the U-shaped seat.

[0007] As a preferred embodiment of the present invention, two limiting assemblies are provided on the upper side of the base. The two limiting assemblies are respectively connected to the two slide rails. Each of the limiting assemblies includes two limiting rods and two limiting blocks. The two limiting blocks are respectively fixedly connected to both sides of the surface of the slide rail. The two limiting rods are both fixedly connected to the upper end of the base and the lower end of the top plate. The two limiting blocks are respectively slidably connected to the circumferential surfaces of the two limiting rods.

[0008] As a preferred embodiment of the present invention, it includes a rigid stamping mode and a compensation stamping mode. In the rigid stamping mode, the positioning plate located on the lower side is connected to the second positioning groove. When the air cylinder operates, it indirectly drives the stamping rod and the upper mold to move downward. The upper mold contacts the lower mold to stamp the material in the lower mold. In the compensation stamping mode, the positioning plate located on the upper side is connected to the first positioning groove. Through the cooperation of the two buffer assemblies, the upper mold is driven to move downward to contact the lower mold, and a certain amount of rebound is generated by the buffer assemblies when stamping the material.

[0009] As a preferred embodiment of the present invention, a discharging assembly is provided inside the base. The discharging assembly includes an air box, an air delivery pipe, and a first control valve. One end of the air delivery pipe is fixedly connected to the surface of the air cylinder, and the other end of the air delivery pipe is fixedly connected to the surface of the air box. A push rod is provided inside the air box, and the push rod is connected to the lower end of the sliding module. The first control valve is installed inside the base and is connected to the air delivery pipe.

[0010] As a preferred embodiment of the present invention, support feet are fixedly connected to the four corners at the lower end of the base.

[0011] As a preferred embodiment of the present invention, the lengths of the two track rods are both 25 cm.

[0012] As a preferred embodiment of the present invention, the air delivery pipe is made of high-strength carbon steel.

[0013] As a preferred embodiment of the present invention, the rotation range of the rotating seat is 0 - 90 degrees.

[0014] A method for using a stamping die for a transmission shaft includes the following steps: S1. Select a rigid stamping mode or a compensation stamping mode according to the material properties of the material to be stamped; S2. Control the operation of the cylinder. The cylinder drives the extension rod to move downward, and the extension rod indirectly drives the stamping rod to move downward, so that the positioning plate on the lower side moves into the second positioning groove. Control the second control valve to open. The cylinder inputs air pressure through the Y-shaped channel and the corrugated air pipe into the rotating seat. The rotating seat rotates and drives the stamping rod to rotate. The stamping rod drives the positioning plate to rotate in the second positioning groove by 90 degrees, completing the connection between the positioning plate and the second positioning groove. At this time, the switching of the rigid stamping mode is completed; S3. Control the operation of the cylinder. The cylinder drives the extension rod to move downward, and the extension rod indirectly drives the stamping rod to move, so that the positioning plate on the upper side moves into the first positioning groove. Control the second control valve to open. The cylinder inputs air pressure through the Y-shaped channel and the corrugated air pipe into the rotating seat. The rotating seat rotates and drives the stamping rod to rotate. The stamping rod drives the positioning plate to rotate 90 degrees in the first positioning groove, completing the connection between the positioning plate and the first positioning groove. At this time, the switching of the compensation stamping mode is completed; S4. Add stamping material into the lower die. Through stamping with the upper die and the lower die, the material is formed. Finally, control the first control valve to open the passage. The air pressure enters the air tank through the air pipe. The push rod in the air tank moves upward, driving the extension rod to move upward in the lower die, and pushing out the stamped die in the lower die from the lower die to complete stamping.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, by using this device, different stamping modes are switched according to different transmission shaft materials. When dealing with complex deformation or high springback materials, the compensation stamping mode is switched. Through the buffer component, the thickness fluctuation of the material is adaptively compensated or the springback is compensated, effectively avoiding the problems of out-of-tolerance part dimensions after forming or the need for additional shaping processes.

[0016] 2. In the present invention, the slide rail in the buffer component is installed at one end of the connecting plate, the track rod is fixedly connected in the slide rail, the track block slides on the circumferential surface of the track rod, and the connecting rod is connected to the upper die through the U-shaped seat. Through the elastic force of the spring, the upper die has buffering performance during stamping and adaptively compensates for springback.

[0017] 3. In the present invention, when discharging, control the first control valve to open. The air pressure enters the air tank from the cylinder through the air pipe. The air pressure pushes the push rod in the air tank to move upward, and the push rod drives the sliding module to move upward, extruding the stamped transmission shaft in the lower die from the lower die, which is convenient for discharging. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the first - perspective three - dimensional view of the present invention; Figure 2 is the second - perspective three - dimensional view of the present invention; Figure 3 is the structural schematic diagram of the rotating base and the rotating block in the present invention; Figure 4 is the first cross - sectional view of the present invention; Figure 5 In the present invention Figure 4 is the partial enlarged view at A in; Figure 6 is the second cross - sectional view of the present invention; Figure 7 In the present invention Figure 6 is the partial enlarged view at B in; Figure 8 is the flowchart of the usage of the present invention.

[0019] In the figure: 1, base; 2, support feet; 3, lower die; 4, upper die; 5, support rods; 6, top plate; 7, cylinder; 8, limit rods; 9, slide rails; 10, limit blocks; 11, connecting rods; 12, track blocks; 13, track rods; 14, springs; 15, U - shaped seats; 16, connecting plates; 17, first positioning grooves; 18, second positioning grooves; 19, rotating bases; 20, rotating blocks; 21, extension rods; 22, air boxes; 23, Y - shaped channels; 24, corrugated air pipes; 25, stamping rods; 26, positioning plates; 27, convex blocks; 28, air delivery pipes; 29, first control valves; 30, second control valves; 31, sliding modules. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0021] Embodiment 1 Please refer to Figures 1-8 , the present invention provides the following technical solutions: A stamping die for a transmission shaft, comprising: Base 1; Support rods 5, there are multiple of them, and the multiple support rods 5 are respectively fixedly connected to the four corners of the upper end of the base 1; Top plate 6, the top plate 6 is fixedly connected to the upper ends of the multiple limit rods 8; Cylinder 7, the cylinder 7 is fixedly connected inside the top plate 6, and an extension rod 21 is slidably connected inside the cylinder 7; A mold assembly, the mold assembly includes a lower mold 3, an upper mold 4 and a sliding module 31. The lower mold 3 is fixedly connected within the base 1. The upper mold 4 is disposed above the lower mold 3. The sliding module 31 is slidably connected within the lower mold 3; A buffer assembly, there are two sets of buffer assemblies, and both sets of buffer assemblies are connected to the upper mold 4; A connecting plate 16, the connecting plate 16 connects the two sets of buffer assemblies; A rotation control assembly, the rotation control assembly includes a second positioning groove 18, a first positioning groove 17, a rotating seat 19, a rotating block 20, a punching rod 25, a positioning plate 26, a convex block 27, a Y-shaped channel 23, a corrugated air pipe 24 and a second control valve 30. There are two corrugated air pipes 24, positioning plates 26 and convex blocks 27. The rotating block 20 is fixedly connected to the lower end of the extension rod 21. Both convex blocks 27 are fixedly connected to the circumferential surface of the rotating block 20. The rotating seat 19 is rotatably connected to the surface of the rotating block 20. The punching rod 25 is fixedly connected to the lower end of the rotating seat 19. Both positioning plates 26 are fixedly connected to the circumferential surface of the punching rod 25. The first positioning groove 17 is opened within the connecting plate 16. The second positioning groove 18 is opened at the upper end of the upper mold 4. The first positioning groove 17 and the second positioning groove 18 respectively match the two positioning plates 26. The Y-shaped channel 23 is opened within the extension rod 21. Both corrugated air pipes 24 are connected to the Y-shaped channel 23 and the interior of the rotating seat 19. The Y-shaped channel 23 is connected to the cylinder 7. The second control valve 30 is installed within the extension rod 21. The second control valve 30 is connected to the Y-shaped channel 23.

[0022] In a specific embodiment of the present invention, support rods 5 are fixedly connected to the four corners of the upper end of the base 1, and the top plate 6 is fixedly connected to the upper ends of the plurality of support rods 5. The top plate 6, the support rods 5, and the base 1 form the overall framework of the device. The air cylinder 7 is installed in the top plate 6. The air cylinder 7 serves as a pneumatic generating device for driving the operation of the device. The mold assembly is composed of a lower mold 3, an upper mold 4, and a sliding module 31. The sliding module 31 is slidably connected in the lower mold 3, and the sliding module 31 fits the mold shape of the lower mold 3. When the upper mold 4 is closed with the lower mold 3, it is used to stamp the material in the lower mold 3. After stamping is completed, the upper mold 4 moves upward, and the sliding module 31 extrudes the stamped transmission shaft in the lower mold 3 from the lower mold 3 to complete the stamping; the rotation control component is used to control the operation of the upper mold 4, and the rotation control component is also used to switch different stamping modes. The extension rod 21 slides in the air cylinder 7, and the up and down movement of the extension rod 21 is controlled by the air pressure generated by the air cylinder 7. The extension rod 21 drives the rotation block 20 and the rotation seat 19 to move, and the rotation seat 19 drives the stamping rod 25 to move. The rotation seat 19 rotates on the circumferential surface of the rotation block 20, and the rotation of the rotation seat 19 is controlled by the air pressure generated by the air cylinder 7. When the second control valve 30 is opened, the air pressure is input into the rotation seat 19 through the Y-shaped channel 23 and the corrugated air pipe 24. The air pressure pushes the convex block 27 fixed on the surface of the rotation block 20. Under the push of the air pressure, the rotation seat 19 rotates 90 degrees on the surface of the rotation block 20. This rotation is used for the connection between the upper positioning plate 26 and the first positioning groove 17 or the connection between the lower positioning plate 26 and the second positioning groove 18. The connecting plate 16 is used to connect the two slide rails 9. When the upper positioning plate 26 is connected to the first positioning groove 17, it is switched to the compensation stamping mode. When the lower positioning plate 26 is connected to the second positioning groove 18, it is switched to the rigid stamping mode; by using this device, different stamping modes are switched according to different transmission shaft materials. When dealing with complex deformation or high springback materials, it is switched to the compensation stamping mode. Through the buffer component, it adapts to the material thickness fluctuation or compensates for springback, effectively avoiding the problems of out-of-tolerance part dimensions after forming or the need for additional shaping processes.

[0023] Specifically, please refer to Figures 1-8 , and each set of buffer components includes a slide rail 9, a track rod 13, a track block 12, a connecting rod 11, a spring 14, and a U-shaped seat 15. The U-shaped seat 15 is fixedly connected to the upper end of the upper mold 4. The slide rail 9 is fixedly connected to one end of the connecting plate 16. The track rod 13 is fixedly connected to the inner wall of the slide rail 9. The track block 12 is slidably connected to the circumferential surface of the track rod 13. The two ends of the spring 14 are respectively fixedly connected to one end of the track block 12 and one side inner wall of the slide rail 9. The connecting rod 11 is rotatably connected to the surface of the track block 12, and the connecting rod 11 is rotatably connected in the U-shaped seat 15.

[0024] In this embodiment: The slide rail 9 in the buffer assembly is installed at one end of the connecting plate 16. The track rod 13 is fixedly connected inside the slide rail 9. The track block 12 slides on the circumferential surface of the track rod 13. The connecting rod 11 is connected to the upper die 4 through the U-shaped seat 15. Due to the elastic force of the spring 14, the upper die 4 has buffering performance during stamping and adaptively compensates for springback.

[0025] For details, please refer to Figures 1-8 , two sets of limiting components are provided on the upper side of the base 1. The two sets of limiting components are respectively connected to the two slide rails 9. Each set of limiting components includes two limiting rods 8 and two limiting blocks 10. The two limiting blocks 10 are respectively fixedly connected to both sides of the surface of the slide rail 9. The two limiting rods 8 are both fixedly connected to the upper end of the base 1 and the lower end of the top plate 6. The two limiting blocks 10 are respectively slidably connected to the circumferential surfaces of the two limiting rods 8.

[0026] In this embodiment: The limiting components are used to limit the slide rail 9 so that the slide rail 9 can only move up and down. Through the cooperation of the limiting components, the slide rail 9 in the compensation stamping mode can operate normally.

[0027] For details, please refer to Figures 1-8 , including the rigid stamping mode and the compensation stamping mode. In the rigid stamping mode, the positioning plate 26 located on the lower side is connected to the second positioning groove 18. When the air cylinder 7 operates, it indirectly drives the stamping rod 25 and the upper die 4 to move downwards. The upper die 4 contacts the lower die 3, and the material in the lower die 3 is stamped. In the compensation stamping mode, the positioning plate 26 located on the upper side is connected to the first positioning groove 17. Through the cooperation of the two sets of buffer components, the upper die 4 is driven to move downwards to contact the lower die 3, and a certain amount of springback is generated by the buffer components when stamping the material.

[0028] In this embodiment: Control the operation of the air cylinder 7. The air cylinder 7 drives the extension rod 21 to move downwards. The extension rod 21 indirectly drives the stamping rod 25 to move downwards, so that the positioning plate 26 located on the lower side moves into the second positioning groove 18. Control the second control valve 30 to open. The air cylinder 7 inputs air pressure through the Y-shaped channel 23 and the corrugated air pipe 24 into the rotating seat 19. The rotating seat 19 rotates and drives the stamping rod 25 to rotate. The stamping rod 25 drives the positioning plate 26 to rotate in the second positioning groove 18 by 90 degrees, completing the connection between the positioning plate 26 and the second positioning groove 18. At this time, the switching of the rigid stamping mode is completed. Control the operation of the air cylinder 7. The air cylinder 7 drives the extension rod 21 to move downwards. The extension rod 21 indirectly drives the stamping rod 25 to move, so that the positioning plate 26 located on the upper side moves into the first positioning groove 17. Control the second control valve 30 to open. The air cylinder 7 inputs air pressure through the Y-shaped channel 23 and the corrugated air pipe 24 into the rotating seat 19. The rotating seat 19 rotates and drives the stamping rod 25 to rotate. The stamping rod 25 drives the positioning plate 26 to rotate 90 degrees in the first positioning groove 17, completing the connection between the positioning plate 26 and the first positioning groove 17. At this time, the switching of the compensation stamping mode is completed.

[0029] For details, please refer to Figures 1-8 In the base 1, there is a discharging component which includes an air box 22, an air pipe 28 and a first control valve 29. One end of the air pipe 28 is fixedly connected to the surface of the air cylinder 7, and the other end of the air pipe 28 is fixedly connected to the surface of the air box 22. There is a push rod in the air box 22, and the push rod is connected to the lower end of the sliding module 31. The first control valve 29 is installed in the base 1 and is connected to the air pipe 28.

[0030] In this embodiment: When discharging, control the first control valve 29 to open. The air pressure enters the air box 22 from the air cylinder 7 through the air pipe 28. The air pressure pushes the push rod in the air box 22 to move upward, and the push rod drives the sliding module 31 to move upward, extruding the transmission shaft completed by stamping in the lower die 3 from the lower die 3, which is convenient for discharging.

[0031] For details, please refer to Figures 1-8 At the four corners of the lower end of the base 1, support feet 2 are fixedly connected.

[0032] In this embodiment: The support feet 2 play a role in supporting the base 1.

[0033] For details, please refer to Figures 1-8 The lengths of the two track rods 13 are both 25 cm.

[0034] In this embodiment: The length of the track rod 13 is 25 cm, and the maximum moving distance of the track block 12 is 20 cm.

[0035] For details, please refer to Figures 1-8 The air pipe 28 is made of high-strength carbon steel.

[0036] In this embodiment: The air pipe 28 is made of high-strength carbon steel. The air pipe 28 made of this material has high strength and will not be damaged by air pressure.

[0037] For details, please refer to Figures 1-8 The rotation range of the rotating seat 19 is 0 - 90 degrees.

[0038] In this embodiment: When the rotating seat 19 rotates to 0 degrees, the stamping rod 25 drives the positioning plate 26 to disengage from the second positioning groove 18 or the first positioning groove 17. When the rotating seat 19 rotates to 90 degrees, the positioning plate 26 is locked with the second positioning groove 18 or the first positioning groove 17.

[0039] It should be noted that: The air cylinder 7, the first control valve 29 and the second control valve 30 used in this device are all prior arts. The specific models of the air cylinder 7, the first control valve 29 and the second control valve 30 can be selected according to actual needs, and no more details will be elaborated here.

[0040] Working principle and usage process of the present invention: When this device is in use, first select the rigid stamping mode or the compensation stamping mode according to the material properties of the material to be stamped; control the operation of the cylinder 7, the cylinder 7 drives the extension rod 21 to move downward, the extension rod 21 indirectly drives the stamping rod 25 to move downward, so that the positioning plate 26 located on the lower side moves into the second positioning groove 18, control the second control valve 30 to open, the cylinder 7 inputs air pressure through the Y-shaped channel 23 and the corrugated air pipe 24 into the rotating seat 19, the rotating seat 19 rotates and drives the stamping rod 25 to rotate, the stamping rod 25 drives the positioning plate 26 to rotate in the second positioning groove 18, rotates 90 degrees, and completes the connection between the positioning plate 26 and the second positioning groove 18. At this time, the switching of the rigid stamping mode is completed; control the operation of the cylinder 7, the cylinder 7 drives the extension rod 21 to move downward, the extension rod 21 indirectly drives the stamping rod 25 to move, so that the positioning plate 26 located on the upper side moves into the first positioning groove 17, control the second control valve 30 to open, the cylinder 7 inputs air pressure through the Y-shaped channel 23 and the corrugated air pipe 24 into the rotating seat 19, the rotating seat 19 rotates and drives the stamping rod 25 to rotate, the stamping rod 25 drives the positioning plate 26 to rotate 90 degrees in the first positioning groove 17, and completes the connection between the positioning plate 26 and the first positioning groove 17. At this time, the switching of the compensation stamping mode is completed; after the switching is completed, add the stamping material into the lower die 3, stamp through the upper die 4 and the lower die 3 to form the material. Finally, control the first control valve 29 to open the passage, the air pressure enters the air box 22 through the air pipe 28, the push rod in the air box 22 moves upward, drives the extension rod 21 to move upward in the lower die 3, and pushes out the stamped die in the lower die 3 from the lower die 3 to complete the stamping; by using this device, switch to different stamping modes for different transmission shaft materials. When dealing with complex deformation or high springback materials, switch to the compensation stamping mode. Through the buffer component, adapt to the material thickness fluctuation or compensate for the springback, effectively avoiding the problems of out-of-tolerance part dimensions after forming or the need for additional shaping processes.

[0041] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stamping die for a transmission shaft, characterized in that, Including: Base (1); Support rods (5), there are multiple of them, and the multiple support rods (5) are respectively fixedly connected to the four corners of the upper end of the base (1); Top plate (6), the top plate (6) is fixedly connected to the upper ends of multiple limiting rods (8); Cylinder (7), the cylinder (7) is fixedly connected inside the top plate (6), and an extension rod (21) is slidably connected inside the cylinder (7); Mold assembly, the mold assembly includes a lower mold (3), an upper mold (4) and a sliding module (31), the lower mold (3) is fixedly connected inside the base (1), the upper mold (4) is arranged above the lower mold (3), and the sliding module (31) is slidably connected inside the lower mold (3); Buffer assembly, there are two groups of it, and both groups of buffer assemblies are connected to the upper mold (4); Connecting plate (16), the connecting plate (16) connects the two groups of buffer assemblies; Rotation control assembly, the rotation control assembly includes a second positioning groove (18), a first positioning groove (17), a rotating seat (19), a rotating block (20), a stamping rod (25), a positioning plate (26), a convex block (27), a Y-shaped channel (23), a corrugated air pipe (24) and a second control valve (30), there are two of the corrugated air pipes (24), the positioning plates (26) and the convex blocks (27), the rotating block (20) is fixedly connected to the lower end of the extension rod (21), the two convex blocks (27) are both fixedly connected to the circumferential surface of the rotating block (20), the rotating seat (19) is rotatably connected to the surface of the rotating block (20), the stamping rod (25) is fixedly connected to the lower end of the rotating seat (19), the two positioning plates (26) are both fixedly connected to the circumferential surface of the stamping rod (25), the first positioning groove (17) is opened in the connecting plate (16), the second positioning groove (18) is opened at the upper end of the upper mold (4), the first positioning groove (17) and the second positioning groove (18) respectively match the two positioning plates (26), the Y-shaped channel (23) is opened in the extension rod (21), the two corrugated air pipes (24) are both connected to the inside of the Y-shaped channel (23) and the rotating seat (19), the Y-shaped channel (23) is connected to the cylinder (7), and the second control valve (30) is installed in the extension rod (21), and the second control valve (30) is connected to the Y-shaped channel (23).

2. The stamping die for a drive shaft according to claim 1, wherein: Each group of the buffer assemblies includes a slide rail (9), a track rod (13), a track block (12), a connecting rod (11), a spring (14) and a U-shaped seat (15), the U-shaped seat (15) is fixedly connected to the upper end of the upper mold (4), the slide rail (9) is fixedly connected to one end of the connecting plate (16), the track rod (13) is fixedly connected to the inner wall of the slide rail (9), the track block (12) is slidably connected to the circumferential surface of the track rod (13), the two ends of the spring (14) are respectively fixedly connected to one end of the track block (12) and one side inner wall of the slide rail (9), the connecting rod (11) is rotatably connected to the surface of the track block (12), and the connecting rod (11) is rotatably connected inside the U-shaped seat (15).

3. The stamping die for a drive shaft according to claim 2, characterized in that: On the upper side of the base (1), there are two groups of limiting components, and the two groups of limiting components are respectively connected to the two slide rails (9). Each group of the limiting components includes two limiting rods (8) and a limiting block (10). The two limiting blocks (10) are respectively fixedly connected to both sides of the surface of the slide rail (9). The two limiting rods (8) are fixedly connected to the upper end of the base (1) and the lower end of the top plate (6). The two limiting blocks (10) are respectively slidably connected to the circumferential surfaces of the two limiting rods (8).

4. The stamping die for a transmission shaft according to claim 3, characterized in that: It includes a rigid stamping mode and a compensation stamping mode. In the rigid stamping mode, the positioning plate (26) located on the lower side is connected to the second positioning groove (18). When the air cylinder (7) operates, it indirectly drives the stamping rod (25) and the upper die (4) to move downward. The upper die (4) contacts the lower die (3) to stamp the material in the lower die (3). In the compensation stamping mode, the positioning plate (26) located on the upper side is connected to the first positioning groove (17). Through the cooperation of the two groups of buffer components, the upper die (4) is driven to move downward to contact the lower die (3), and a certain amount of rebound is generated by the buffer components when stamping the material.

5. The stamping die for a transmission shaft according to claim 4, characterized in that: A discharging component is arranged in the base (1). The discharging component includes an air box (22), an air delivery pipe (28), and a first control valve (29). One end of the air delivery pipe (28) is fixedly connected to the surface of the air cylinder (7). The other end of the air delivery pipe (28) is fixedly connected to the surface of the air box (22). A push rod is arranged in the air box (22), and the push rod is connected to the lower end of the sliding module (31). The first control valve (29) is installed in the base (1), and the first control valve (29) is connected to the air delivery pipe (28).

6. The stamping die for a drive shaft according to claim 5, wherein: Support feet (2) are fixedly connected to the four corners of the lower end of the base (1).

7. A stamping die for a transmission shaft according to claim 6, characterized in that: The lengths of the two rail rods (13) are both 25 cm.

8. A stamping die for a transmission shaft according to claim 7, characterized in that: The air delivery pipe (28) is made of high-strength carbon steel.

9. A stamping die for a transmission shaft according to claim 8, characterized in that: The rotation range of the rotating seat (19) is 0 - 90 degrees.

10. A method for using a stamping die for a transmission shaft, which uses a stamping die for a transmission shaft described in any one of claims 1-9, characterized in that, It includes the following steps: S1. Select the rigid stamping mode or the compensation stamping mode according to the material properties to be stamped; S2. Control the operation of the air cylinder (7). The air cylinder (7) drives the extension rod (21) to move downward. The extension rod (21) indirectly drives the stamping rod (25) to move downward, so that the positioning plate (26) located on the lower side moves into the second positioning groove (18). Control the second control valve (30) to open. The air cylinder (7) inputs air pressure through the Y-shaped channel (23) and the corrugated air pipe (24) into the rotating seat (19). The rotating seat (19) rotates and drives the stamping rod (25) to rotate. The stamping rod (25) drives the positioning plate (26) to rotate in the second positioning groove (18) by 90 degrees, completing the connection between the positioning plate (26) and the second positioning groove (18). At this time, the switching of the rigid stamping mode is completed; S3. Control the operation of the cylinder (7). The cylinder (7) drives the extension rod (21) to move downward. The extension rod (21) indirectly drives the stamping rod (25) to move, so that the positioning plate (26) on the upper side moves into the first positioning groove (17). Control the second control valve (30) to open. The cylinder (7) inputs air pressure into the rotating seat (19) through the Y-shaped channel (23) and the corrugated air pipe (24). The rotating seat (19) rotates and drives the stamping rod (25) to rotate. The stamping rod (25) drives the positioning plate (26) to rotate 90 degrees in the first positioning groove (17), completing the connection between the positioning plate (26) and the first positioning groove (17). At this time, the switching of the compensation stamping mode is completed; S4. Add stamping materials into the lower die (3). Through stamping with the upper die (4) and the lower die (3), the materials are formed. Finally, control the first control valve (29) to open the passage. The air pressure enters the air tank (22) through the air pipe (28). The push rod in the air tank (22) moves upward, driving the extension rod (21) to move upward in the lower die (3), and pushing out the stamped die in the lower die (3), completing the stamping.

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