Concave-convex combined die for cold spinning belt pulley

Abstract

The invention discloses a concave-convex combined die for a cold spinning belt pulley, and belongs to the field of spinning combined dies. The concave-convex combined die for the cold spinning belt pulley comprises a mounting base and further comprises a guide assembly, the guide assembly comprises a guide rod fixed to the top of the mounting base, the surface of the guide rod is in sliding connection with a moving seat, an upper die is arranged at the bottom of the moving seat, and a lower die coaxial with the upper die is arranged at the top of the mounting base; a belt pulley workpiece is placed above the lower die; the two groups of adjusting mechanisms are respectively arranged at the bottom of the upper mold and the inner bottom wall of the lower mold; self-adaptive adjustment clamping can be carried out on the upper reference surface and the lower reference surface of a point-to-point belt pulley workpiece, the static friction force of the contact surface with the surface of the workpiece is increased, the tangential force generated when a spinning head presses downwards is resisted, the problem that deformation is easily generated due to local suspension stress concentration of the belt pulley workpiece is avoided, and the clamping effect of the die on the workpiece is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spinning combined die, in particular to a cold spinning pulley concave-convex combined die. BACKGROUND

[0002] The pulley belongs to the hub part, mainly used for the connection of the pulley, and through the friction between the pulley, the pulley drives the belt strip to rotate synchronously in the rotating process, so as to realize the purpose of power transmission, and the pulley can be processed by cold spinning, the flat plate or hollow blank is fixed on the die of the spinning machine, and the spinning head or the chasing rod is pressed on the blank to make it produce local plastic deformation.

[0003] At present, in order to increase the overall strength or reduce the weight of the pulley workpiece, there are convex or concave positions on the pulley reference surface. Since the pulley workpiece is directly placed on the die for clamping, and then the pulley workpiece side is cold spun by the spinning head, the pulley workpiece will be partially suspended between the dies, which will cause stress concentration and deformation problem, and further reduce the clamping effect of the die on the workpiece. SUMMARY

[0004] The purpose of the present application is to solve the problem of local suspension of the pulley workpiece between the dies in the prior art, and a cold spinning pulley concave-convex combined die is provided.

[0005] In order to achieve the above purpose, the technical scheme is as follows:

[0006] A cold spinning pulley concave-convex combined die, comprising a mounting base, further comprising: a guide assembly comprising a guide rod fixed to the top of the mounting base, a moving seat is slidably connected to the surface of the guide rod, an upper die is arranged at the bottom of the moving seat, a lower die is arranged on the top of the mounting base and coaxial with the upper die, and a pulley workpiece is placed above the lower die; an adjusting mechanism, two groups of the adjusting mechanism are arranged at the bottom of the upper die and the inner bottom wall of the lower die respectively, the adjusting mechanism has a plurality of telescopic supporting units, and the telescopic supporting units are used for accurately supporting the concave-convex surface of the pulley workpiece; a reinforcing mechanism arranged in the upper die is used for fixing the pulley workpiece; a water cooling mechanism arranged in the lower die is used for cooling the pulley workpiece.

[0007] Preferably, the adjusting mechanism comprises a fixed disc, a plurality of adjusting rods are slidably connected in the fixed disc, a plurality of limiting cylinder bodies are fixedly connected in the fixed disc, a plurality of reset springs are fixedly connected in the limiting cylinder bodies, the reset springs are fixed at the end of the adjusting rod, and a plurality of air holes corresponding to the positions of the limiting cylinder bodies are arranged in the bottom of the fixed disc.

[0008] Preferably, the reinforcing mechanism comprises a collection groove, an exhaust pipe and a mounting cavity formed in the upper die, the collection groove is communicated with the air hole, the exhaust pipe is communicated with the fixing disc, and the mounting cavity is fixedly connected with an air bag in the inside.

[0009] Preferably, the bottom of the upper die is provided with a reinforcing groove, and the reinforcing groove is communicated with the inside of the mounting cavity.

[0010] Preferably, the water cooling mechanism comprises a water inlet channel, a water outlet channel, a spiral channel and a water storage cavity formed in the lower die, the spiral channel is communicated with the water outlet channel and the water inlet channel respectively, the water storage cavity is communicated with the air hole and the water inlet channel respectively, and an electromagnetic valve is arranged at the connection position of the water storage cavity and the water inlet channel.

[0011] Preferably, the top of the mounting base is rotatably provided with a rotating shaft through the driving part, and the end of the rotating shaft is connected with the lower die through a flange.

[0012] Preferably, the inside of the mounting base is fixedly connected with a limiting sleeve one and a limiting sleeve two respectively, and the limiting sleeve one and the limiting sleeve two are rotatably connected with the surface of the rotating shaft.

[0013] Preferably, the inside of the rotating shaft is provided with two groups of hollow channels, the two groups of hollow channels are communicated with the water inlet channel and the water outlet channel respectively, the surface of the rotating shaft is provided with a connecting hole one and a connecting hole two, the two groups of hollow channels are communicated with the connecting hole one and the connecting hole two respectively, the connecting hole one is communicated with the inside of the limiting sleeve one, and the connecting hole two is communicated with the inside of the limiting sleeve two.

[0014] Preferably, the inside of the mounting base is provided with a water inlet and a drain respectively, the water inlet is communicated with the limiting sleeve one, and the drain is communicated with the inside of the limiting sleeve two.

[0015] Preferably, the surface of the adjusting rod is fixedly connected with a piston ring, and the piston ring is interference-fitted with the inside of the limiting cylinder.

[0016] Compared with the prior art, the cold spinning pulley concave-convex combined die has the following beneficial effects:

[0017] 1. The cold spinning pulley concave-convex combined die can realize self-adaptive adjustment and clamping of the upper and lower reference surfaces of the pulley workpiece through the cooperation of the fixing disc, the adjusting rod, the limiting cylinder and the return spring, avoids the deformation problem caused by local suspension stress concentration of the pulley workpiece, and further improves the clamping effect of the die on the workpiece.

[0018] 2. The cold spinning pulley concave-convex combined die, through the cooperation between the collecting groove, the exhaust pipe, the installation cavity and the air bag, flexible contact is formed between the die and the upper surface of the pulley workpiece, so that the static friction of the workpiece contact surface can be significantly increased, and the tangential force generated when the spinning head is pressed down is resisted.

[0019] 3. The cold spinning pulley concave-convex combined die, through the cooperation between the water inlet channel, the water outlet channel and the spiral channel, the cooling liquid flow path is in three-dimensional spiral shape in the die, so that the circumferential and axial areas of the pulley workpiece are covered, the heat of the pulley workpiece is evenly spread, the heat exchange time is prolonged, the cooling liquid stays in the pipeline for a longer time, and the heat absorption is more sufficient.

[0020] The parts not involved in the device are the same as or can be realized by the prior art, the present application can adjust and clamp the upper and lower reference surfaces of the pulley workpiece through multiple points, increase the static friction of the workpiece contact surface, resist the tangential force generated when the spinning head is pressed down, avoid the deformation caused by local suspension stress concentration of the pulley workpiece, and further improve the clamping effect of the die on the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0022] Figure 2 A front structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0023] Figure 3 An adjusting mechanism structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0024] Figure 4 A structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0025] Figure 5 A structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application; Figure 4 A structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0026] Figure 6 A reinforcing groove structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0027] Figure 7 A water cooling mechanism structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0028] Figure 8 A structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application; Figure 4 A structure diagram of a cold spinning pulley concave-convex combined die is provided for the present application;

[0029] Figure 9 A cold spinning pulley concave-convex combined die pulley workpiece structure schematic diagram is provided for the present application.

[0030] In the figure: 1, mounting base; 2, guide rod; 3, moving seat; 4, upper die; 5, lower die; 6, pulley workpiece; 7, adjusting mechanism; 71, fixed disc; 72, adjusting rod; 73, limiting cylinder; 74, return spring; 75, piston ring; 76, air hole; 8, reinforcing mechanism; 81, collection groove; 82, exhaust pipe; 83, mounting cavity; 84, air bag; 85, reinforcing groove; 9, water cooling mechanism; 91, water inlet channel; 92, water outlet channel; 93, spiral channel; 94, water accumulation cavity; 95, electromagnetic valve; 10, rotating shaft; 11, limiting sleeve one; 12, limiting sleeve two; 13, hollow channel; 14, connecting hole one; 15, connecting hole two; 16, water inlet; 17, water outlet. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In one embodiment, with reference to Figures 1-9 A cold spinning pulley concave-convex combined die, comprising a mounting base 1, further comprising: a guide assembly, comprising a guide rod 2 fixed to the top of the mounting base 1, the surface of the guide rod 2 being slidingly connected with a moving seat 3, the bottom of the moving seat 3 being provided with an upper die 4, the top of the mounting base 1 being provided with a lower die 5 coaxial with the upper die 4, and a pulley workpiece 6 being placed above the lower die 5; an adjusting mechanism 7, two groups of adjusting mechanisms 7 being respectively arranged at the bottom of the upper die 4 and the inner bottom wall of the lower die 5, the adjusting mechanism 7 having a plurality of telescopic supporting units, the telescopic supporting units being used for accurately supporting the concave-convex surface of the pulley workpiece 6; a reinforcing mechanism 8 arranged inside the upper die 4 and used for fixing the pulley workpiece 6; a water cooling mechanism 9 arranged inside the lower die 5 and used for cooling the pulley workpiece 6.

[0034] Specifically, first, the workpiece 6 to be processed is placed horizontally on the positioning reference surface of the lower die 5, ensuring that the workpiece axis is coaxial with the lower die 5, and then the moving seat 3 is lowered by the gas cylinder control to adhere the upper die 4 at the end of the moving seat 3 to the upper reference surface of the pulley workpiece 6. The guide rod 2 above the mounting base 1 can guide the movement of the moving seat 3, ensuring that the upper die 4 and the lower die 5 are always on the same axis, avoiding misalignment that prevents the pulley workpiece 6 from being spun. The adjustment mechanism 7 can be used to adjust the concave-convex position of the upper and lower reference surfaces of the pulley workpiece 6, achieving point-to-point close adhesion and avoiding gaps between the workpiece and the die. The workpiece may slip or displace due to uneven stress during spinning, and the adjustment mechanism 7 can be used to drive the reinforcement mechanism 8 to further strengthen the friction between the upper die 4 and the pulley workpiece 6, improve the clamping effect, and evenly cool the pulley workpiece 6 through the reinforcement mechanism 8.

[0035] In one embodiment, referring to Figure 2 and Figure 3 The adjustment mechanism 7 includes a fixed disc 71, a plurality of adjustment rods 72 are slidably connected inside the fixed disc 71, a plurality of limiting cylinders 73 are fixedly connected inside the fixed disc 71, a plurality of return springs 74 are fixedly connected inside the limiting cylinders 73, the return springs 74 are fixed to the ends of the adjustment rods 72, a plurality of air holes 76 corresponding to the positions of the limiting cylinders 73 are formed in the bottom of the fixed disc 71, a piston ring 75 is fixedly connected to the surface of the adjustment rod 72, and the piston ring 75 is interference fit with the inside of the limiting cylinder 73.

[0036] With this scheme, multiple sets of adjustment rods 72 are arranged in the fixed disc 71 to adaptively adjust the clamping of the upper and lower reference surfaces of the pulley workpiece 6, avoiding local suspension stress concentration of the pulley workpiece 6 and easily causing deformation problems.

[0037] In specific work, through the setting of the fixed disc 71, a plurality of adjusting rods 72, a limiting cylinder 73 and a reset spring 74 are installed. When the pulley workpiece 6 is placed above the lower mold 5, the adjusting mechanism 7 can be adjusted according to the protruding and recessed positions at the bottom of the pulley workpiece 6, so that the plurality of adjusting rods 72 are tightly attached to the lower reference surface of the pulley workpiece 6. Then, the upper mold 4 is controlled to move down by the moving seat 3, so that the adjusting mechanism 7 at the end of the upper mold 4 is attached to the upper reference surface of the pulley workpiece 6, and can also be adjusted according to the protruding or recessed position of the pulley workpiece 6. Therefore, it can be ensured that the reference surface of the pulley workpiece 6 is always pressed tightly, so that the protruding or recessed position on the reference surface of the pulley workpiece 6 will not be deformed due to jumping. The contact pressure gradient matching the surface topography of the workpiece is formed by the difference in compression amount of the reset spring 74. The adjusting rod 72 in the recessed position has a larger elongation and stronger contact force, and the adjusting rod 72 in the protruding position has a smaller elongation and moderate contact force, so that the "point-to-point" precise clamping is realized. The adjusting rod 72 is automatically reset. Through the setting of the piston ring 75 on the surface of the adjusting rod 72, when the adjusting rod 72 moves in the limiting cylinder 73, the gas in the limiting cylinder 73 can be discharged, so as to ensure the sealing between the adjusting rod 72 and the limiting cylinder 73.

[0038] In addition, the adjusting mechanism 7 does not need to be adjusted manually, and can be compatible with the reference surface changes within the size tolerance ±0.5mm of the workpiece. It is suitable for complex topography workpieces with reinforcing ribs, heat dissipation holes or special-shaped bosses, and thin-walled lightweight workpieces with a wall thickness of 1.5-3mm.

[0039] In one embodiment, referring to Figure 4 , Figure 5 , Figure 6 The reinforcing mechanism 8 includes a collection groove 81, an exhaust pipe 82 and an installation cavity 83 which are provided in the upper mold 4. The collection groove 81 is in communication with the air hole 76, the exhaust pipe 82 is in communication with the fixed disc 71, and the installation cavity 83 is fixedly connected with an air bag 84 in the inside. The air bag 84 is in communication with the end of the exhaust pipe 82. The bottom of the upper mold 4 is provided with a reinforcing groove 85 which is in communication with the inside of the installation cavity 83.

[0040] By adopting such a scheme, after the air bag 84 is inflated and expanded, its surface forms a large-area flexible contact with the upper surface of the pulley workpiece 6. The high friction coefficient of the material such as rubber or silicone of the air bag 84 can significantly increase the static friction force of the contact surface, resist the tangential force generated when the spinning head is pressed down, and the uniform pressure distribution of the air bag 84 can enhance the system rigidity, reduce the vibration caused by uneven contact between the mold and the workpiece during the spinning process, thereby reducing the risk of surface corrugation and size deviation of the pulley workpiece 6.

[0041] Specifically, the gas compressed by the adjusting rod 72 in the limiting cylinder 73 can be collected through the opening of the collecting groove 81, and then transported to the air bag 84 through the exhaust pipe 82 to make the air bag 84 expand. After expansion, the air bag 84 is deeply inserted into the reinforcing groove 85 and adheres to the surface of the pulley workpiece 6, so as to increase the friction force at the edge of the pulley workpiece 6, thereby further reinforcing the clamping force of the pulley workpiece 6 and the upper die 4, so as to prevent the pulley workpiece 6 from being displaced during spinning. The installation cavity 83 is used to limit and install the air bag 84.

[0042] In addition, the reinforcing groove 85 is opened in multiple groups, so that the air bag 84 is evenly distributed on the surface of the pulley workpiece 6, thereby further improving the friction coefficient. The total clamping force is improved by superimposing the mechanical clamping force of the adjusting rod 72 and the pneumatic friction force of the air bag 84, thereby significantly enhancing the anti-tangential sliding ability of the pulley workpiece 6.

[0043] In one embodiment, referring to Figure 4 and Figure 7 , the water cooling mechanism 9 includes a water inlet channel 91, a water outlet channel 92, a spiral channel 93 and an accumulated water cavity 94 opened in the lower die 5. The spiral channel 93 is in communication with the water outlet channel 92 and the water inlet channel 91. The accumulated water cavity 94 is in communication with the air hole 76 and the water inlet channel 91 respectively. An electromagnetic valve 95 is arranged at the connection between the accumulated water cavity 94 and the water inlet channel 91.

[0044] With such a scheme, the cooling liquid flow path is in a three-dimensional spiral shape around the lower die 5, covering the entire area of the workpiece in the circumferential and axial directions, ensuring uniform heat dispersion of the pulley workpiece 6, and prolonging the heat exchange time. The residence time of the cooling liquid in the pipeline is increased, and the heat absorption is more sufficient.

[0045] Specifically, the water inlet channel 91 can transport cooling liquid into the spiral channel 93, which can spiral cover the surface of the pulley workpiece 6 to absorb heat, thereby ensuring uniform heat dissipation of the pulley workpiece 6. Then the cooling liquid after heat exchange can be discharged through the water outlet channel 92 to form a water circulation for cooling.

[0046] With the arrangement of the electromagnetic valve 95 in the accumulated water cavity 94, when the upper die 4 and the lower die 5 are in demolding, the electromagnetic valve 95 is in an open state. In addition, the valve at the connection between the water inlet channel 91 and the spiral channel 93 is closed. At this time, the cooling liquid in the water inlet channel 91 enters the accumulated water cavity 94, and the cooling liquid is transported to the limiting cylinder 73 through the air hole 76. At this time, the cooling liquid will push the adjusting rod 72 in the limiting cylinder 73 upward, so that the cooling liquid can push the formed pulley workpiece 6 upward to realize the automation of the demolding process.

[0047] After the pulley workpiece 6 is ejected, the electromagnetic valve 95 and the valve connected with the spiral pipe of the water inlet channel 91 are opened, a new workpiece is put in, and then the mold closing operation is performed. When the new pulley workpiece 6 is clamped, part of the adjusting rod 72 slides downward along the shape of the pulley workpiece 6, so that part of the water in the water storage cavity 94 flows out. After the mold closing is completed, the electromagnetic valve 95 is closed;

[0048] When demolding, the valve connected with the spiral pipe of the water inlet channel 91 is closed, and the electromagnetic valve 95 is opened. Under the action of water pressure, the adjusting rod 72 is pushed upward to assist in demolding the pulley workpiece 6.

[0049] In addition, when the cooling liquid enters the limiting cylinder 73, it can be used to cool the pulley workpiece 6 point by point during the spinning work of the workpiece.

[0050] When demolding, the cooling liquid in the limiting cylinder 73 can be replaced, so that the heat-exchanged cooling liquid replaces the cooled cooling liquid, thereby continuously performing heat exchange work on the new pulley workpiece 6.

[0051] In one embodiment, referring to Figure 4 , Figure 7 and Figure 8 , the top of the mounting base 1 is provided with a rotating shaft 10 which is rotated by the driving part. The end of the rotating shaft 10 is connected with the lower mold 5 through a flange. The inside of the mounting base 1 is fixedly connected with a limiting sleeve one 11 and a limiting sleeve two 12 respectively. The limiting sleeve one 11 and the limiting sleeve two 12 are rotationally connected with the surface of the rotating shaft 10. Two groups of hollow channels 13 are arranged in the inside of the rotating shaft 10. The two groups of hollow channels 13 are respectively communicated with the water inlet channel 91 and the water outlet channel 92. Connection holes one 14 and connection holes two 15 are respectively arranged on the surface of the rotating shaft 10. The two groups of hollow channels 13 are respectively communicated with the connection holes one 14 and the connection holes two 15. The connection holes one 14 are communicated with the inside of the limiting sleeve one 11. The connection holes two 15 are communicated with the inside of the limiting sleeve two 12. A water inlet 16 and a drainage outlet 17 are respectively arranged in the inside of the mounting base 1. The water inlet 16 is communicated with the limiting sleeve one 11. The drainage outlet 17 is communicated with the inside of the limiting sleeve two 12.

[0052] In specific work, the rotating shaft 10 is rotated by the driving part, so as to rotate the rotating shaft 10 fixed on the lower mold 5, thereby driving the pulley workpiece 6 placed on the lower mold 5 to rotate. At this time, the side spinning head is gradually fed to complete the side cold spinning of the pulley workpiece 6.

[0053] It is to be noted that the upper mold 4 is rotationally connected with the moving seat 3. The moving seat 3 is bearing-connected with a fixed shaft. The fixed shaft is connected with the upper mold 4 through a flange. Figure 2 It is to be noted that the upper mold 4 is rotationally connected with the moving seat 3. The moving seat 3 is bearing-connected with a fixed shaft. The fixed shaft is connected with the upper mold 4 through a flange.

[0054] By installing the setting of the limiting sleeve one 11 and the limiting sleeve two 12 inside the mounting base 1, the rotating shaft 10 can be stably supported, so as to ensure the stability of the rotating shaft 10 rotation, in addition, the oil seal ring is arranged between the connecting part of the limiting sleeve one 11, the limiting sleeve two 12 and the rotating shaft 10, so as to ensure the sealing performance of the connecting part between the limiting sleeve one 11, the limiting sleeve two 12 and the rotating shaft 10, and avoid the leakage problem;

[0055] Under the setting of the two groups of hollow channels 13 inside the rotating shaft 10, the water inlet channel 91 and the water outlet channel 92 can be communicated respectively, the water supply in the water inlet channel 91 and the drainage operation in the water outlet channel 92 can be carried out respectively, so as to form a closed loop cooling, through the setting of the connecting hole one 14 and the connecting hole two 15 on the surface of the rotating shaft 10, the cooling liquid in the two groups of rotating shafts 10 can be circulated and discharged, through the setting of the water inlet 16 and the drainage port 17 inside the mounting base 1, the water inlet 16 can be communicated with the external cooling pipe, so that the external cooling liquid enters the limiting sleeve one 11, the connecting hole one 14 and the hollow channel 13 through the water inlet 16, the drainage port 17 can be communicated with the external water pipe, so that the cooling liquid in the rotating shaft 10 after heat exchange is discharged into the drainage port 17 through the connecting hole two 15 and the limiting sleeve two 12, through the above-mentioned mode, a closed loop waterway system can be formed, so as to ensure that the lower mold 5 can uniformly cool the pulley workpiece 6.

[0056] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A cold spinning pulley concave-convex combined die, comprising a mounting base (1), characterized in that: Also includes: A guide assembly comprises a guide rod (2) fixed to the top of a mounting base (1); a movable seat (3) is slidably connected to the surface of the guide rod (2); an upper mold (4) is provided at the bottom of the movable seat (3); a lower mold (5) coaxial with the upper mold (4) is provided at the top of the mounting base (1); a pulley workpiece (6) is placed above the lower mold (5); An adjusting mechanism (7), wherein two groups of the adjusting mechanisms (7) are respectively arranged at the bottom of the upper mold (4) and the inner bottom wall of the lower mold (5), and the adjusting mechanism (7) has a plurality of telescopic support units, and the telescopic support units are used to accurately support the concave and convex surfaces of the pulley workpiece (6); A reinforcement mechanism (8) is provided inside the upper mold (4) and is used to fix the pulley workpiece (6); A water cooling mechanism (9) is arranged inside the lower mold (5) and is used to cool the pulley workpiece (6).

2. The cold spinning pulley concave-convex combined die according to claim 1, characterized in that: The adjusting mechanism (7) includes a fixed disk (71), the supporting unit includes an adjusting rod (72) sliding on the fixed disk (71), a plurality of limiting cylinders (73) are fixedly connected inside the fixed disk (71), a plurality of the limiting cylinders (73) are fixedly connected inside to reset springs (74), the reset springs (74) are fixed to the end of the adjusting rod (72), and a plurality of air holes (76) corresponding to the positions of the limiting cylinders (73) are opened at the bottom of the fixed disk (71).

3. The cold spinning pulley concave-convex combined die according to claim 1, characterized in that: The reinforcing mechanism (8) comprises a collecting groove (81), an exhaust pipe (82) and an installation cavity (83) provided inside the upper mold (4); the collecting groove (81) and the air hole (76) are communicated with each other; the exhaust pipe (82) is communicated with the fixed plate (71); an air bag (84) is fixedly connected to the interior of the installation cavity (83); and the air bag (84) is communicated with the end of the exhaust pipe (82).

4. The cold spinning pulley concave-convex combined die according to claim 1, characterized in that: A reinforcement groove (85) is provided at the bottom of the upper mold (4), and the reinforcement groove (85) is communicated with the interior of the installation cavity (83).

5. The cold spinning pulley concave-convex combined die according to claim 1, characterized in that: The water cooling mechanism (9) comprises a water inlet channel (91), a water outlet channel (92), a spiral channel (93) and a water accumulation chamber (94) which are provided inside the lower mold (5); the spiral channel (93) is respectively communicated with the water outlet channel (92) and the water inlet channel (91); the water accumulation chamber (94) is respectively communicated with the air hole (76) and the water inlet channel (91); and a solenoid valve (95) is provided at the connection between the water accumulation chamber (94) and the water inlet channel (91).

6. The cold spinning pulley concave-convex combined die according to claim 1, characterized in that: A rotating shaft (10) is rotated on the top of the mounting base (1) through a driving unit, and the end of the rotating shaft (10) is connected to the lower mold (5) through a flange.

7. The cold spinning pulley concave-convex combined die according to claim 1, characterized in that: The interior of the mounting base (1) is fixedly connected to a first limiting sleeve (11) and a second limiting sleeve (12), respectively. The first limiting sleeve (11) and the second limiting sleeve (12) are rotatably connected to the surface of the rotating shaft (10).

8. The cold spinning pulley concave-convex combined die according to claim 7, characterized in that: Two groups of hollow channels (13) are provided inside the rotating shaft (10), and the two groups of hollow channels (13) are respectively connected to the water inlet channel (91) and the water outlet channel (92). A connecting hole 1 (14) and a connecting hole 2 (15) are respectively provided on the surface of the rotating shaft (10), and the two groups of hollow channels (13) are respectively connected to the connecting hole 1 (14) and the connecting hole 2 (15). The connecting hole 1 (14) is connected to the interior of the limiting sleeve 1 (11), and the connecting hole 2 (15) is connected to the interior of the limiting sleeve 2 (12).

9. The cold spinning pulley concave-convex combined die according to claim 7, characterized in that: A water inlet (16) and a water outlet (17) are respectively provided inside the mounting base (1); the water inlet (16) is connected to the first limiting sleeve (11), and the water outlet (17) is connected to the inside of the second limiting sleeve (12).

10. The cold spinning pulley concave-convex combined die according to claim 2, characterized in that: The surface of the regulating rod (72) is fixedly connected with a piston ring (75), and the piston ring (75) is interference-fitted with the interior of the limiting cylinder (73).

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