A cold heading forming device and method of a square double-end transmission shaft part

Abstract

The application belongs to the technical field of cold heading forming processing, and particularly relates to a cold heading forming device and method for a square double-end transmission shaft part, which comprises a door type opening and closing assembly, an axis positioning assembly, a clamping and synchronizing assembly, a part body, a station conversion assembly, an upper die assembly and a lower die assembly, the door type opening and closing assembly is arranged outside the station conversion assembly in an array, the lower die assembly is fixedly connected to an external rack, the upper die assembly is slidingly arranged in the lower die assembly, the axis positioning assembly is symmetrically arranged at the bottom of the door type opening and closing assembly, and the clamping and synchronizing assembly is arranged between the axis positioning assemblies. The application utilizes the lifting action of the die during forging and pressing, simultaneously drives the lifting of the material ejection rod, and realizes automatic material ejection. Furthermore, the axis positioning assembly and the door type opening and closing baffle are provided with magnetism, and the magnetic pole direction of the magnetic element is arranged, so that the part body can be automatically picked up and positionally adjusted.

Description

Technical Field

[0001] This invention belongs to the field of cold heading forming technology, specifically referring to a cold heading forming device and method for a square double-headed drive shaft part. Background Technology

[0002] Cold heading is a process that utilizes the plastic deformation of metal under external force at room temperature and reshapes the part with the help of a mold. Generally speaking, since the single deformation range of metal at room temperature should not be too large, each step of the cold heading process often requires multiple processing steps. Shaft parts also have relatively many features, so more workstations are required. The transfer of parts between workstations also requires more complex picking mechanisms and control steps. Summary of the Invention

[0003] In response to the above situation and to overcome the shortcomings of the prior art, this invention proposes a cold heading forming device and method for a double-headed drive shaft part with automatic picking and position adjustment functions. This solution utilizes the lifting action inherent in the die forging process, and simultaneously drives the lifting of the ejector pin to achieve automatic ejection. Furthermore, by combining a magnetic shaft positioning component and a gate-type opening and closing baffle, as well as the magnetic pole direction setting of the magnetic element, the picking and position adjustment of the part body can be completed automatically.

[0004] The technical solution adopted by this invention is as follows: This invention proposes a cold heading forming device for a square double-headed drive shaft part, including a gantry opening and closing assembly, a shaft positioning assembly, a clamping synchronization assembly, a part body, a station conversion assembly, an upper mold assembly, and a lower mold assembly. The gantry opening and closing assembly is arrayed outside the station conversion assembly. The lower mold assembly is fixed to an external frame. The upper mold assembly is slidably disposed in the lower mold assembly. The shaft positioning assembly is symmetrically disposed at the bottom of the gantry opening and closing assembly. The clamping synchronization assembly is disposed between the shaft positioning assemblies.

[0005] This solution can utilize the lifting action during die forging to simultaneously drive the lifting of the ejector pin, thus achieving automatic material ejection. Furthermore, by combining a magnetic shaft positioning component and a gantry-type opening and closing baffle, it can automatically pick up and adjust the position of the part.

[0006] Furthermore, the gantry opening and closing assembly includes a cantilever plate and a gantry opening and closing baffle. The cantilever plate is disposed on the workstation conversion assembly and has a central hole. The gantry opening and closing baffle is symmetrically disposed below the central hole. The gantry opening and closing baffle is hinged to the lower part of the cantilever plate and can be flipped downwards. The hinge of the gantry opening and closing baffle is provided with a torsion spring that can restore it to a horizontal state. The gantry opening and closing baffle can generate a magnetic attraction force on the part body.

[0007] When the upper mold passes through the central hole, it can push the gate-type opening and closing baffle to unfold. When the upper mold rises away from the central hole, the gate-type opening and closing baffle will return to horizontal under the action of the torsion spring and remain locked in position under the action of mutual attraction.

[0008] Furthermore, the axial positioning assembly includes a fixed seat, a translation clamping seat, and parallel connecting rods. The fixed seat is fixedly connected to the bottom of the gantry opening and closing assembly. The two ends of the parallel connecting rods are respectively hinged to the fixed seat and the translation clamping seat. The two sets of parallel connecting rods are arranged in parallel, so the translation clamping seat remains vertical during the swinging process.

[0009] When the round shaft is located between the two arc-shaped inner linings, the two arc-shaped inner linings will approach and adhere tightly to the round shaft. At this time, because the distance between the two arc-shaped inner linings is relatively large, the repulsive force is small. When the round shaft is not located between the two arc-shaped inner linings, the translation clamp will unfold and droop under its own weight.

[0010] Preferably, the translational clamping seat is provided with an arc-shaped inner liner, which can generate a magnetic attraction force on the part body. The two symmetrically arranged arc-shaped inner liners repel each other, and the two symmetrically arranged gate-type opening and closing baffles attract each other.

[0011] Since the curved inner liner needs to be attracted to the part body, the curved inner liner is a magnet; by setting them in a relative manner, the curved inner liners have a repulsive force between them, which can avoid the problem of the two curved inner liners attracting each other after the round shaft part is separated from the curved inner liner.

[0012] Furthermore, the clamping synchronization assembly includes a T-shaped slide bar and a synchronization link. The T-shaped slide bar is slidably mounted on the cantilever plate, one end of the synchronization link is hinged to the bottom of the T-shaped slide bar, and the other end of the synchronization link is hinged to the translation clamping seat.

[0013] The clamping synchronization component enables two symmetrically arranged sets of axis positioning components to move closer and further apart synchronously, thereby achieving position adjustment of the central axis of the part body and keeping it coaxial with the upper and lower molds.

[0014] Furthermore, the center of the part body is a flange, and the upper and lower ends of the flange are respectively provided with a round shaft and a square part. A frustum is provided between the flange and the square part, and a square step is provided between the flange and the round shaft. The end of the square part is provided with a chamfer.

[0015] Furthermore, the workstation conversion assembly includes an annular belt and a conversion disc. The conversion disc is mounted on an external vertical shaft and can rotate with the shaft. The annular belt is mounted on the conversion disc, and the cantilever plate array is located outside the annular belt.

[0016] The station conversion component can sequentially transfer the station of each part body, realizing assembly line-style step-by-step forging.

[0017] Furthermore, the upper mold assembly includes a lifting slide sleeve, a frame-type lifting frame, and an upper mold. The lifting slide sleeve is engaged at both ends of the lower mold assembly. The frame-type lifting frame has symmetrically arranged lifting slide rods on both sides. The lifting slide rods are engaged and slidably disposed in the lifting slide sleeve. The upper mold array is located at the top of the frame-type lifting frame.

[0018] Furthermore, the lower mold assembly includes a fixed base, a lower mold, and a ejector rod. The fixed base is fixed to an external frame, the lower mold array is located in the fixed base, and the ejector rod is fixed to the bottom of the frame-type lifting frame. The ejector rod is coaxially arranged with the lower mold.

[0019] Both the ejector pin and the upper die are mounted on a frame-type lifting frame, which can automatically control the ejector pin's position during forging and automatically eject the part from the lower die after forging is completed.

[0020] This invention also proposes a method for using a cold heading forming device for a square double-headed drive shaft part, specifically including the following steps:

[0021] Step 1: The blank of the part body is placed in the axis positioning assembly by an external robotic arm or manually. The axial position of the part body is positioned by the arc-shaped inner lining on both sides. The top of the blank abuts against and is attracted to the door-type opening and closing baffle.

[0022] Step 2: When the billet moves to the top of the forging station, the frame lifting frame is driven to descend by the external push rod. At this time, the upper mold and the ejector rod descend synchronously. The upper mold first passes through the center hole and pushes the gate-type opening and closing baffle to flip down and unfold. At the same time, it pushes the part body down so that it enters between the upper mold and the lower mold. The part is then forged through the gap between the upper mold and the lower mold.

[0023] Step 3: After the forging process is completed, the frame lifting frame is driven to rise by the external push rod. At this time, the upper mold and the ejector rod rise synchronously, and the ejector rod will push the part body stuck in the lower mold upward.

[0024] Step 4: When the upper mold detaches from the central hole, the gate-type opening and closing baffle will return to horizontal under the action of the torsion spring, and will remain horizontal and locked under the attraction force of the two.

[0025] Step 5: When the round shaft moves between the arc-shaped inner liner, the two arc-shaped inner liner will move closer and stick tightly to the round shaft under the action of magnetic attraction, thereby automatically adjusting the position of the central axis of the part body and clamping the part body.

[0026] Step Six: After the part body is picked up and adsorbed under the gantry-type opening and closing baffle, the external rotating shaft drives the conversion disk to rotate, thereby shifting all the part bodies one station by the ring belt.

[0027] Step 7: After the part body has passed through all the stations from the blank, it has completed its cold heading. Then, the part body can be removed by an external robot or manually.

[0028] The beneficial effects achieved by the present invention using the above structure are as follows:

[0029] (1) This solution can utilize the lifting action during die forging to simultaneously drive the ejector pin to lift and remove material, thus achieving automatic ejection. Moreover, combined with a magnetic shaft positioning component and a door-type opening and closing baffle, it can automatically pick up and adjust the position of the part body.

[0030] (2) When the upper mold passes through the central hole, it can push the gate-type opening and closing baffle to unfold. When the upper mold rises away from the central hole, the gate-type opening and closing baffle will return to the horizontal under the action of the torsion spring and remain locked in position under the action of mutual attraction.

[0031] (3) When the round shaft is located between the two arc-shaped inner linings, the two arc-shaped inner linings will approach and adhere to the round shaft. At this time, the repulsive force is small because the distance between the two arc-shaped inner linings is relatively large. When the round shaft is not located between the two arc-shaped inner linings, the translation clamp will unfold and droop under its own weight.

[0032] (4) Since the arc-shaped inner liner needs to be attracted to the part body, the arc-shaped inner liner is a magnet; by setting them in the same order, the arc-shaped inner liners have a repulsive force, which can avoid the problem of the two arc-shaped inner liners attracting each other after the round shaft part is separated from the arc-shaped inner liner.

[0033] (5) By using the clamping synchronization component, the two sets of symmetrically arranged axis positioning components can move closer and further away synchronously, which can realize the position adjustment of the central axis of the part body, so that it remains coaxial with the upper mold and the lower mold.

[0034] (6) The station conversion component can sequentially transfer the station of each part body to realize assembly line-style step-by-step forging.

[0035] (7) The ejector pin and the upper mold are both set on the frame lifting frame, which can automatically control the position of the ejector pin during the forging process and automatically eject the part body from the lower mold after the forging is completed. Attached Figure Description

[0036] Figure 1 This is a perspective view of a cold heading forming device for a square double-headed drive shaft part proposed in this invention.

[0037] Figure 2 This is a front view of a cold heading forming device for a square double-headed drive shaft part proposed in this invention;

[0038] Figure 3 for Figure 2 A cross-sectional view along the cutting line AA;

[0039] Figure 4 for Figure 2 A cross-sectional view along the cutting line BB;

[0040] Figure 5 for Figure 2 A cross-sectional view along the section line CC;

[0041] Figure 6 for Figure 4 A magnified view of a section at point I;

[0042] Figure 7 for Figure 3 Enlarged view of a section at point II;

[0043] Figure 8 These are schematic diagrams showing the outlines of the workpiece and mold under different processes;

[0044] Figure 9 A schematic diagram showing the angle adjustment of the chamfered corner of the square part.

[0045] Among them, 1. Gate opening and closing assembly, 2. Shaft positioning assembly, 3. Clamping synchronization assembly, 4. Part body, 5. Station conversion assembly, 6. Upper mold assembly, 7. Lower mold assembly, 11. Cantilever plate, 12. Gate opening and closing baffle, 21. Fixed seat, 22. Translation clamping seat, 23. Parallel connecting rod, 31. T-shaped slide rod, 32. Synchronization connecting rod, 41. Square part, 42. Flange part, 43. Round shaft part, 51. Annular belt, 52. Conversion plate, 61. Lifting slide sleeve, 62. Frame lifting frame, 63. Upper mold, 71. Fixed base, 72. Lower mold, 73. Unloading ejector rod, 111. Center hole, 221. Arc-shaped inner liner, 621. Lifting slide rod.

[0046] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] like Figures 1-7 As shown, the present invention proposes a cold heading forming device for a square double-headed drive shaft part, including a gantry opening and closing assembly 1, a shaft positioning assembly 2, a clamping synchronization assembly 3, a part body 4, a station conversion assembly 5, an upper mold assembly 6, and a lower mold assembly 7. The gantry opening and closing assembly 1 is arranged in an array outside the station conversion assembly 5. The lower mold assembly 7 is fixed to the external frame. The upper mold assembly 6 is slidably arranged in the lower mold assembly 7. The shaft positioning assembly 2 is symmetrically arranged at the bottom of the gantry opening and closing assembly 1. The clamping synchronization assembly 3 is arranged between the shaft positioning assemblies 2.

[0050] This solution can utilize the lifting action during die forging to simultaneously drive the lifting of the ejector rod 73, thereby achieving automatic ejection. Furthermore, by combining the magnetic shaft positioning component 2 and the gate-type opening and closing baffle 12, it can automatically complete the picking up and position adjustment of the part body 4.

[0051] The gantry opening and closing assembly 1 includes a cantilever plate 11 and a gantry opening and closing baffle 12. The cantilever plate 11 is disposed on the workstation conversion assembly 5 and has a central hole 111. The gantry opening and closing baffle 12 is symmetrically disposed below the central hole 111. The gantry opening and closing baffle 12 is hinged to the lower part of the cantilever plate 11 and can be flipped downward. The hinge of the gantry opening and closing baffle 12 is provided with a torsion spring that can restore it to a horizontal state. The gantry opening and closing baffle 12 can generate a magnetic attraction force on the part body 4.

[0052] When the upper mold 63 passes through the central hole 111, it can push the gate-type opening and closing baffle 12 to unfold. When the upper mold 63 rises away from the central hole 111, the gate-type opening and closing baffle 12 will return to horizontal under the action of the torsion spring and remain locked in position under the action of mutual attraction.

[0053] The axial positioning assembly 2 includes a fixed base 21, a translation clamping base 22, and a parallel connecting rod 23. The fixed base 21 is fixedly connected to the bottom of the door opening and closing assembly 1. The two ends of the parallel connecting rod 23 are respectively hinged to the fixed base 21 and the translation clamping base 22. The two sets of parallel connecting rods 23 are arranged in parallel, so the translation clamping base 22 remains vertical during the swinging process.

[0054] When the round shaft portion 43 is located between the two arc-shaped inner linings 221, the two arc-shaped inner linings 221 will approach and adhere tightly to the round shaft portion 43. At this time, since the distance between the two arc-shaped inner linings 221 is relatively far, the repulsive force is small. When the round shaft portion 43 is not located between the two arc-shaped inner linings 221, the translation clamping seat 22 will unfold and droop under its own weight.

[0055] The translational clamping seat 22 is provided with an arc-shaped inner liner 221. The arc-shaped inner liner 221 can generate a magnetic attraction force on the part body 4. The two symmetrically arranged arc-shaped inner liners 221 repel each other, and the two symmetrically arranged gate-type opening and closing baffles 12 attract each other.

[0056] Since the arc-shaped inner liner 221 needs to be attracted to the part body 4, the arc-shaped inner liner 221 is a magnet; by setting them in the same order, the arc-shaped inner liner 221 has a repulsive force between them, which can avoid the problem of the two arc-shaped inner liners 221 attracting each other after the round shaft part 43 is separated from the arc-shaped inner liner 221.

[0057] The clamping synchronization assembly 3 includes a T-shaped slide bar 31 and a synchronization link 32. The T-shaped slide bar 31 is slidably mounted on the cantilever plate 11. One end of the synchronization link 32 is hinged to the bottom of the T-shaped slide bar 31, and the other end of the synchronization link 32 is hinged to the translation clamping seat 22.

[0058] By using the clamping synchronization component 3, the two symmetrically arranged sets of axis positioning components 2 can move closer and further away synchronously, thereby enabling the position adjustment of the central axis of the part body 4 to keep it coaxial with the upper mold 63 and the lower mold 72.

[0059] The center of the part body 4 is the flange part 42. The upper and lower ends of the flange part 42 are respectively provided with a round shaft part 43 and a square part 41. A frustum is provided between the flange part 42 and the square part 41. A square step is provided between the flange part 42 and the round shaft part 43. The end of the square part 41 is chamfered.

[0060] The workstation conversion assembly 5 includes an annular belt 51 and a conversion disc 52. The conversion disc 52 is located on an external vertical shaft and can rotate with the shaft. The annular belt 51 is located on the conversion disc 52, and the cantilever plates 11 are arranged on the outside of the annular belt 51.

[0061] The station conversion component 5 can sequentially transfer the station of each part body 4, realizing assembly line-style step-by-step forging.

[0062] The upper mold assembly 6 includes a lifting slide sleeve 61, a frame lifting frame 62, and an upper mold 63. The lifting slide sleeve 61 is engaged at both ends of the lower mold assembly 7. The frame lifting frame 62 has symmetrical lifting slide rods 621 on both sides. The lifting slide rods 621 are engaged and slidably disposed in the lifting slide sleeve 61. The upper mold 63 is arranged in an array on the top of the frame lifting frame 62.

[0063] The lower mold assembly 7 includes a fixed base 71, a lower mold 72, and a ejector rod 73. The fixed base 71 is fixed to the external frame. The lower mold 72 is arranged in an array in the fixed base 71. The ejector rod 73 is fixed to the bottom of the frame-type lifting frame 62. The ejector rod 73 is coaxially arranged with the lower mold 72.

[0064] The ejector pin 73 and the upper mold 63 are both mounted on the frame-type lifting frame 62, which can automatically control the position of the ejector pin 73 during the forging process and automatically eject the part body 4 from the lower mold 72 after the forging is completed.

[0065] like Figure 8 As shown, the vertical ranges where A, B, C, and D are located correspond to the blank and the processing steps of the square part 41, the flange part 42, and the round shaft part 43, respectively. In the same center line, the middle position represents the shape of the part body 4 at different stages, the upper part represents the upper mold 63, and the lower part represents the lower mold 72. Since the deformation of the workpiece is limited each time in the cold heading process, each processing step may require several steps to complete.

[0066] In fact, the setting of the upper mold 63 and the lower mold 72 can be flexibly adjusted according to the specific features of the part body 4. If there is a square part 41 on the part body 4, the chamfer at the end of the square part 41 can guide it so that even if there is a small deviation in the angle of the part body 4, it can be automatically adjusted. If there is no square part 41 on the part body 4 and it is all cylindrical structure, then there is no need to care about the angle of the workpiece.

[0067] like Figure 9 As shown, when the bottom of the square part 41 is combined with the lower mold 72, even if there is a small angular deviation, the angle of the part body 4 can be automatically adjusted by utilizing the guiding characteristics of the angle itself.

[0068] In practical use, the user first needs to place the blank of the part body 4 into the axis positioning component 2 through an external robotic arm or manually, and position its axis position through the arc-shaped inner lining 221 on both sides. The top of the blank abuts against and is attracted to the door-type opening and closing baffle 12.

[0069] When the billet moves to the top of the forging station, the frame lifting frame 62 is driven to descend by the external push rod. At this time, the upper mold 63 and the ejector rod 73 descend synchronously. The upper mold 63 first passes through the center hole 111 and pushes the gate-type opening and closing baffle 12 to flip down and unfold. At the same time, it pushes the part body 4 down so that it enters between the upper mold 63 and the lower mold 72. The part is then forged through the gap between the upper mold 63 and the lower mold 72.

[0070] Both the upper mold 63 and the lower mold 72 are equipped with several sets. Because the deformation of the workpiece is limited each time in the cold heading process, each process may be completed in several times. After each forging station is finished, the frame lifting frame 62 is driven to rise by the external push rod. At this time, the upper mold 63 and the ejector rod 73 rise synchronously. The ejector rod 73 will push the part body 4 stuck in the lower mold 72 upward. Since the part body 4 is a long and thin strip structure, the lower mold 72 can provide a general guide for the part body 4.

[0071] When the upper mold 63 disengages from the central hole 111, the gate-type opening and closing baffle 12 will return to a horizontal position under the action of the torsion spring, and will remain horizontal and locked under the attraction force of the two.

[0072] When the round shaft 43 moves between the arc-shaped inner liner 221, the two arc-shaped inner liner 221 will approach and adhere to the round shaft 43 under the action of magnetic attraction. At this time, although there is a repulsive force between the two arc-shaped inner liner 221, the impact is small because the distance is far. Under the synchronous action of the clamping synchronization component 3, the arc-shaped inner liner 221 on both sides approach the round shaft 43 synchronously, thereby automatically adjusting the position of the central axis of the part body 4.

[0073] If the part body 4 has a square portion 41, the chamfer at the end of the square portion 41 can guide it so that even if there is a slight deviation in the angle of the part body 4, it can be automatically adjusted. If the part body 4 does not have a square portion 41 and is a cylindrical structure, then there is no need to worry about the angle of the workpiece.

[0074] After the part body 4 is picked up and attached to the bottom of the door-type opening and closing baffle 12, the external rotating shaft drives the conversion disk 52 to rotate, thereby shifting all the part bodies 4 to one station via the ring belt 51.

[0075] Once part body 4 has passed through all the workstations from the blank, it has completed its cold heading process. Then, part body 4 can be removed by an external robotic arm or manually.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0077] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A cold-upsetting forming apparatus for a square double-end propeller shaft part, characterized by: Including door type open and close assembly (1), shaft center positioning assembly (2), clamping synchronous assembly (3), part body (4), work station conversion assembly (5), upper die assembly (6) and lower die assembly (7), the door type open and close assembly (1) array is located in the outside of work station conversion assembly (5), the lower die assembly (7) is fixedly connected on the outside frame, the upper die assembly (6) is slidably arranged in the lower die assembly (7), the shaft center positioning assembly (2) is symmetrically arranged at the bottom of the door type open and close assembly (1), the clamping synchronous assembly (3) is arranged between the shaft center positioning assembly (2); The door type open and close assembly (1) includes a cantilever plate (11) and a door type open and close baffle (12), the cantilever plate (11) is arranged on the work station conversion assembly (5), the cantilever plate (11) is provided with a center hole (111), the door type open and close baffle (12) is symmetrically arranged below the center hole (111), the door type open and close baffle (12) is hinged below the cantilever plate (11) and can be turned over towards the lower side, the hinge of the door type open and close baffle (12) is provided with a torsion spring capable of restoring the horizontal state, the door type open and close baffle (12) can generate magnetic attraction force on the part body (4). The shaft center positioning assembly (2) includes a fixed seat (21), a translation clamping seat (22) and a parallel connecting rod (23), the fixed seat (21) is fixedly connected below the door type open and close assembly (1), the two ends of the parallel connecting rod (23) are hinged to the fixed seat (21) and the translation clamping seat (22) respectively, and the two groups of parallel connecting rods (23) are arranged in parallel, so that the translation clamping seat (22) remains vertical during swinging.

2. A cold heading forming device for square double-end transmission shaft parts according to claim 1, characterized in that: The translation clamping seat (22) is provided with an arc-shaped lining (221), the arc-shaped lining (221) can generate magnetic attraction force on the part body (4), and the two arc-shaped linings (221) arranged symmetrically repel each other, and the two door type open and close baffles (12) arranged symmetrically attract each other.

3. A cold heading forming device for square double-end transmission shaft parts according to claim 2, characterized in that: The clamping synchronous assembly (3) includes a T-shaped slide rod (31) and a synchronous connecting rod (32), the T-shaped slide rod (31) is arranged on the cantilever plate (11) in a lifting and sliding manner, one end of the synchronous connecting rod (32) is hinged to the bottom of the T-shaped slide rod (31), and the other end of the synchronous connecting rod (32) is hinged to the translation clamping seat (22).

4. A cold heading forming device for square double-end transmission shaft parts according to claim 3, characterized in that: The center position of the part body (4) is a flange part (42), the upper and lower ends of the flange part (42) are respectively provided with a circular shaft part (43) and a square part (41), a circular table is arranged between the flange part (42) and the square part (41), a square step is arranged between the flange part (42) and the circular shaft part (43), and a chamfer is arranged at the end of the square part (41).

5. A cold heading forming device for square double-end transmission shaft parts according to claim 4, characterized in that: The work station conversion assembly (5) includes a ring belt (51) and a conversion disc (52), the conversion disc (52) is arranged on a vertical shaft outside and can rotate with the shaft, the ring belt (51) is arranged on the conversion disc (52), and the cantilever plate (11) is arranged on the outer side of the ring belt (51).

6. A cold heading forming device for square double-end transmission shaft parts according to claim 5, characterized in that: The upper die assembly (6) comprises a lifting sliding sleeve (61), a frame lifting frame (62) and an upper die (63), the lifting sliding sleeve (61) is clamped on both ends of the lower die assembly (7), the frame lifting frame (62) is symmetrically provided with lifting sliding rods (621) on both sides, the lifting sliding rods (621) are clamped and slidably arranged in the lifting sliding sleeve (61), and the upper die (63) is arranged on the top of the frame lifting frame (62).

7. A cold heading forming device for square double-end transmission shaft parts according to claim 6, characterized in that: The lower die assembly (7) comprises a fixed base (71), a lower die (72) and a material return ejector rod (73), the fixed base (71) is fixedly connected to the external rack, the lower die (72) is arranged in the fixed base (71), and the material return ejector rod (73) is fixedly connected to the bottom of the frame lifting frame (62), and the material return ejector rod (73) is coaxially arranged with the lower die (72).

8. A method of using a cold upset forming device for square double ended propeller shaft parts according to claim 7, characterized in that, Comprise the following steps: Step one: the blank of the part body (4) is placed in the axial positioning assembly (2) by an external mechanical hand or manually, the axial position of the part body (4) is positioned by the arc-shaped inner liner (221) on both sides, the top of the blank is abutted against and adsorbed by the door type opening and closing baffle (12); Step two: when the blank moves above the forging and pressing station, the frame lifting frame (62) is driven to descend by an external push rod, at this time, the upper die (63) and the material return ejector rod (73) are synchronously lowered, the upper die (63) first passes through the center hole (111) and pushes the door type opening and closing baffle (12) to turn and unfold downward, while pushing the part body (4) downward, so that the part body (4) enters between the upper die (63) and the lower die (72), and the part body (4) is forged and pressed between the upper die (63) and the lower die (72); Step three: after the forging and pressing process is completed, the frame lifting frame (62) is driven to rise by an external push rod, at this time, the upper die (63) and the material return ejector rod (73) are synchronously raised, and the material return ejector rod (73) pushes the part body (4) clamped in the lower die (72) upward; Step four: when the upper die (63) is separated from the center hole (111), the door type opening and closing baffle (12) is restored to be horizontal under the action of the torsional spring, and is kept in a horizontal state and locked under the action of the adsorption force of the two; Step five: when the circular shaft part (43) moves between the arc-shaped inner liners (221), the two arc-shaped inner liners (221) are synchronously close to and tightly contact the circular shaft part (43) under the action of the magnetic attraction force, so that the central axis position of the part body (4) can be automatically adjusted and the part body (4) can be clamped; Step six: after the part body (4) is picked up and adsorbed below the door type opening and closing baffle (12), the conversion disc (52) is rotated by an external rotating shaft, so that all the part bodies (4) are offset by one station by the annular belt (51); Step seven: after the part body (4) passes through all the stations from the blank, the cold heading forming of the part body (4) is completed, and then the part body (4) can be taken down by an external mechanical hand or manually.

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