Universal shaft spline high-efficiency cold extrusion processing device

Abstract

The utility model discloses a kind of high-efficiency cold extrusion processing devices of universal shaft spline, it is related to machining technical field, including processing base, the top eccentricity of processing base is fixedly installed with four guide rods in rectangular array, the top of four The guide rod is fixedly installed with top plate, the top center of processing base is provided with universal shaft positioning mechanism, the upper portion of universal shaft positioning mechanism is provided with down mechanism, and the down mechanism includes down plate.The utility model spline cold-pressing die adopts modular design, realizes radial positioning by the attachment of limiting ring and down plate bottom, axial fixation is completed by the thread connection of limiting disc and fixed bolt and bolt hole on top, traditional overall disassembly bolt mode is simplified, only need to loosen single fixed bolt can replace die, substantially reduce die-changing time, simultaneously, different specifications of spline cold-pressing die can be equipped with limiting ring unified size in advance, realize that it is disassembled and installed, significantly improve production line flexibility and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a high-efficiency cold extrusion processing device for universal joint splines. Background Technology

[0002] Universal joints are core components of transmission systems in automobiles, construction machinery, and other industries. The precision and strength of their spline structure directly affect power transmission efficiency and lifespan. Cold extrusion technology, due to its advantages such as high processing efficiency, good material utilization, and significant improvement in product strength, is gradually replacing traditional machining as the mainstream process for spline manufacturing. The following problems exist with existing technologies:

[0003] Because different specifications of splines require frequent mold changes, the traditional assembly method of disassembling bolts as a whole is time-consuming and labor-intensive, reducing production efficiency; at the same time, high contact stress is generated between the spline and the die after molding, and the traditional mechanical ejection mechanism is prone to scratches or even deformation of the workpiece surface, increasing processing costs. Utility Model Content

[0004] This invention provides a high-efficiency cold extrusion processing device for universal joint splines to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A high-efficiency cold extrusion processing device for universal joint splines includes a processing base. Four guide rods are fixedly mounted in a rectangular array at the eccentric top of the processing base. A top plate is fixedly mounted at the top of the four guide rods. A universal joint positioning mechanism is located at the center of the top of the processing base. A pressing mechanism is located above the universal joint positioning mechanism. The pressing mechanism includes a pressing plate, which is slidably connected to the four guide rods. A hydraulic cylinder is fixedly mounted on the top of the top plate. Four columns are fixedly mounted in a rectangular array on the top of the pressing plate. A connecting plate is fixedly mounted on the top of the four columns. The output end of the hydraulic cylinder extends through to the bottom of the top plate and is fixedly connected to the center of the top of the connecting plate. A through-hole mold mounting hole is formed at the center of the pressing plate. A spline cold pressing mold is fitted into the inner cavity of the mold mounting hole. A cold pressing hole is formed at the center of the bottom of the spline cold pressing mold. A plurality of spline racks are uniformly fixedly mounted in a ring array on the inner wall of the cold pressing hole.

[0007] A further improvement of this utility model is that: a limiting plate is provided on the top of the spline cold pressing mold, the bottom eccentric part of the limiting plate is in contact with the top of the lower pressure plate, a bolt hole is provided at the center of the top of the spline cold pressing mold, a through hole is provided on the limiting plate, the through hole and the bolt hole are connected vertically, a fixing bolt is provided on the inner ring of the through hole, and the bottom end of the fixing bolt is threadedly connected to the bolt hole.

[0008] A further improvement of this utility model is that a limiting ring is fixedly installed on the outer wall of the spline cold pressing mold, and the top of the limiting ring is in contact with the bottom of the lower pressure plate.

[0009] A further improvement of this utility model is that: the universal joint positioning mechanism includes a positioning box, which is fixedly installed on the top of the processing base. A servo motor is fixedly installed on the left side of the positioning box. The output shaft of the servo motor passes through the inner cavity of the positioning box and is fixedly installed with a positive and negative threaded rod. The left and right sides of the outer wall of the positive and negative threaded rod are respectively provided with threaded walls with opposite threads, and the outer walls of the two threaded walls are threaded with movable plates. The top of the two movable plates is fixedly installed with gate-shaped clamping plates. The front and rear sides of the top of the positioning box are provided with sliding grooves that penetrate its inner cavity. The front and rear vertical positions of the two gate-shaped clamping plates are respectively slidably connected to the front and rear sliding grooves.

[0010] A further improvement of this utility model is that: a support column is fixedly installed between the upper and lower sides of the inner wall of the positioning box, the support column has a through hole that runs through the left and right sides, the positive and negative threaded rods pass through the through hole, a limiting slide rod is fixedly installed between the left and right sides of the inner wall of the positioning box, the limiting slide rod is located in front of the positive and negative threaded rods, and both of the moving plates are slidably connected to the limiting slide rod.

[0011] A further improvement of this utility model is that: a rubber pad is provided on the top of the processing base, the center of the rubber pad is located directly above the support column, and extrusion cylindrical blocks are fixedly installed on both the front and rear sides of the two opposing gate-shaped clamps, and rubber sleeves are fixedly adhered to the outer walls of the two extrusion cylindrical blocks on the opposing sides of the two gate-shaped clamps.

[0012] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0013] 1. This utility model provides a high-efficiency cold extrusion processing device for universal joint splines. The spline cold pressing die adopts a modular design. Radial positioning is achieved by the fit between the limiting ring and the bottom of the lower pressure plate. The top is axially fixed by the threaded connection between the limiting plate and the fixing bolt and the bolt hole. The traditional method of disassembling the bolt as a whole is simplified. Only a single fixing bolt needs to be loosened to replace the die, which greatly reduces the die change time. At the same time, different specifications of spline cold pressing dies can be equipped with a uniform size of limiting ring in advance to achieve disassembly and assembly, which significantly improves the flexibility of the production line and production efficiency.

[0014] 2. This utility model provides a high-efficiency cold extrusion processing device for universal joint splines. The universal joint positioning mechanism adopts a portal-type clamping plate in conjunction with the extrusion cylindrical block. The outer wall of the clamping plate is bonded with a rubber sleeve. The servo motor drives the positive and negative threaded rods to control the clamping plate to be synchronously centered, avoiding uneven load. After the cold extrusion is completed, the lower pressure plate moves directly upward to drive the spline cold extrusion mold to detach from the workpiece. There is no ejection mechanism in contact with the workpiece surface. There is no friction from the mechanical ejection mechanism during the demolding process, which completely avoids scratches or deformation, reduces the scrap rate and subsequent repair costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the pressing mechanism of the present invention;

[0017] Figure 3 This is a schematic cross-sectional view of the spline cold pressing mold of this utility model.

[0018] Figure 4 This is a schematic diagram of the universal joint positioning mechanism of the present invention.

[0019] Figure 5 This is a schematic diagram of the extruded cylindrical block of the present invention.

[0020] In the diagram: 1. Machining base; 2. Guide rod; 3. Top plate; 31. Hydraulic cylinder; 4. Pressing mechanism; 41. Pressing plate; 411. Mold mounting hole; 412. Splined cold pressing mold; 4121. Limiting ring; 4122. Cold pressing hole; 4123. Splined rack; 4124. Bolt hole; 413. Limiting plate; 414. Through hole; 415. Fixing bolt; 42. Column; 43. Connecting plate; 5. Universal shaft positioning mechanism; 51. Positioning box; 511. Rubber pad placement; 52. Servo motor; 53. Positive and negative threaded rod; 54. Support column; 55. Through hole; 56. Moving plate; 57. Gate-shaped clamping plate; 571. Extruded cylindrical block; 572. Rubber sleeve; 58. Slide groove; 59. Limiting slide rod. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] like Figure 1 , Figure 2As shown, this utility model provides a high-efficiency cold extrusion processing device for universal joint splines, including a processing base 1. Four guide rods 2 are fixedly installed in a rectangular array at the top eccentric part of the processing base 1. A top plate 3 is fixedly installed at the top of the four guide rods 2. A universal joint positioning mechanism 5 is provided at the top center of the processing base 1. A pressing mechanism 4 is provided above the universal joint positioning mechanism 5. The pressing mechanism 4 includes a pressing plate 41, which is slidably connected to the four guide rods 2. A hydraulic cylinder 31 is fixedly installed at the top of the top plate 3. Four columns 42 are fixedly installed in a rectangular array at the top of the pressing plate 41. A connecting plate 43 is fixedly installed at the top of the four columns 42. The output end of the hydraulic cylinder 31 extends through to the bottom of the top plate 3 and is fixedly connected to the top center of the connecting plate 43.

[0023] In use, the connecting plate 43 can be lowered by starting the hydraulic cylinder 31, so that the connecting plate 43 can be lowered stably by means of the lower pressure plate 41 connected by the four columns 42 and the sliding connection with the guide rod 2, and cold pressing operation can be performed.

[0024] like Figure 3 As shown, a through mold mounting hole 411 is provided at the center of the lower pressure plate 41. A spline cold pressing mold 412 is fitted into the inner cavity of the mold mounting hole 411. A cold pressing hole 4122 is provided at the bottom center of the spline cold pressing mold 412. Several spline racks 4123 are uniformly fixedly installed in a ring array on the inner wall of the cold pressing hole 4122. A limit plate 413 is provided at the top of the spline cold pressing mold 412. The bottom eccentric part of the limit plate 413 is aligned with the top of the lower pressure plate 41. The spline cold pressing mold 412 has a bolt hole 4124 at the top center, and the limiting plate 413 has a through hole 414 that runs vertically through it. The through hole 414 and the bolt hole 4124 are vertically connected. A fixing bolt 415 is provided in the inner ring of the through hole 414. The bottom end of the fixing bolt 415 is threaded to the bolt hole 4124. A limiting ring 4121 is fixedly installed on the outer wall of the spline cold pressing mold 412. The top of the limiting ring 4121 is fitted with the bottom of the lower pressure plate 41.

[0025] First, align the spline cold pressing mold 412 with the matching size cold pressing hole 4122 with the mold mounting hole 411 opened in the lower pressure plate 41 and insert it until the limit ring 4121 abuts against the bottom of the lower pressure plate 41. Then, place the limit plate 413 on the top of the spline cold pressing mold 412 and thread the fixing bolt 415 through the through hole 414 and then into the bolt hole 4124 for fixing. When installing the fixing bolt 415, a wrench can be used to tighten it in the height space between the connecting plate 43 and the lower pressure plate 41, so that the spline cold pressing mold 412 is fixed. When installing the fixing bolt 415, the other hand should hold the spline cold pressing mold 412 to prevent it from deviating. When the spline cold pressing mold 412 is installed, the lower pressure plate 41 descends, causing the top of the universal joint to be inserted into the cold pressing hole 4122. The spline is formed by the cold extrusion of the spline rack 4123. After the extrusion is completed, the spline cold pressing mold 412 is pulled up directly by the lower pressure plate 41, while the universal joint remains in place under the positioning effect, thus completing the cold extrusion process. Spline cold pressing molds 412 with different diameter cold pressing holes 4122 or different numbers of spline racks 4123 can be produced according to the required universal joint size. The outer wall is equipped with limit rings 4121, and the top is also provided with bolt holes 4124 for easy and quick replacement.

[0026] like Figure 4 , Figure 5 As shown, the universal joint positioning mechanism 5 includes a positioning placement box 51, which is fixedly installed on the top of the processing base 1. A servo motor 52 is fixedly installed on the left side of the positioning placement box 51. The output shaft of the servo motor 52 passes through the inner cavity of the positioning placement box 51 and is fixedly installed with a positive and negative threaded rod 53. The left and right sides of the outer wall of the positive and negative threaded rod 53 are respectively provided with threaded walls with opposite threads, and the outer walls of the two threaded walls are threaded with movable plates 56. The top of the two movable plates 56 is fixedly installed with gate-shaped clamping plates 57. The front and rear sides of the top of the positioning placement box 51 are provided with sliding grooves 58 that pass through its inner cavity. The front and rear vertical positions of the two gate-shaped clamping plates 57 are respectively slidably connected to the front and rear sliding grooves 58. The upper and lower sides of the inner wall of the positioning placement box 51 are fixedly connected. A support column 54 is installed to support the universal joint and prevent the top of the positioning box 51 from collapsing. The support column 54 has a through hole 55 that runs through the left and right sides. The positive and negative threaded rods 53 pass through the through hole 55. The inner wall of the positioning box 51 is fixedly installed between the left and right sides with a limit slide rod 59. The limit slide rod 59 is located in front of the positive and negative threaded rods 53. Both moving plates 56 are slidably connected to the limit slide rod 59. The top of the processing base 1 is provided with a rubber pad 511. The center of the rubber pad 511 is located directly above the support column 54. The front and rear sides of the two gate-shaped clamps 57 are fixedly installed with extrusion cylindrical blocks 571. The outer walls of the two extrusion cylindrical blocks 571 on the opposite sides of the two gate-shaped clamps 57 are fixedly glued with rubber sleeves 572.

[0027] During cold pressing, the end of the universal joint to be extruded with the spline facing upwards can be placed on the rubber pad 511. The rubber pad 511 can prevent the bottom of the shaft from slipping during positioning. Then, the servo motor 52 can be started to drive the positive and negative threaded rods 53 in the inner cavity of the positioning box 51 to rotate. The opposite threaded walls on the left and right sides of the outer wall of the positive and negative threaded rods 53 are respectively connected to the threads of the two moving plates 56. This controls the two moving plates 56 to move stably and synchronously close together through the sliding connection with the limit slide rod 59. This controls the two portal clamps 57 to move stably close together through the sliding connection between the two vertical points and the slide groove 58, until the two horizontal extrusion cylindrical blocks 571 of the two portal clamps 57 hold the outer wall of the universal joint. The arc surface of the rubber sleeve 572 installed on the outer wall of the extrusion cylindrical block 571 can improve the clamping stability of the universal joint, thereby clamping the universal joint to the top center position of the positioning box 51 and keeping it vertically stable.

[0028] The working principle of this universal joint spline high-efficiency cold extrusion processing device will be explained in detail below.

[0029] like Figure 1-5As shown, during use, the connecting plate 43 can be lowered by starting the hydraulic cylinder 31, so that the connecting plate 43 can be stably lowered by the lower pressure plate 41 connected by the four columns 42 with the sliding connection of the guide rod 2 for cold pressing operation. During cold pressing, the end of the universal shaft that needs to be extruded splines can be placed on the rubber pad 511 with the end facing upward. The rubber pad 511 can prevent the bottom of the shaft from slipping during positioning. Then, the servo motor 52 can be started to drive the positive and negative threaded rods 53 in the inner cavity of the positioning and placement box 51 to rotate. The opposite threads on the left and right sides of the outer wall of the positive and negative threaded rods 53 respectively interact with the two moving plates 56. The threaded connection allows the two moving plates 56 to move stably and synchronously close together via a sliding connection with the limiting slide rod 59. This, in turn, allows the two portal clamping plates 57 to move stably together via a sliding connection with the slide groove 58 at two vertical points. The two horizontal extrusion cylindrical blocks 571 of the two portal clamping plates 57 then clamp the outer wall of the universal joint. The arc surface of the rubber sleeve 572 installed on the outer wall of the extrusion cylindrical block 571 improves the clamping stability of the universal joint, thus clamping the universal joint to the top center position of the positioning box 51 and maintaining vertical stability. Then, the spline cold-pressing mold 4 with matching cold-pressing holes 4122 can be pre-installed. 12. Align the mold mounting hole 411 on the lower pressure plate 41 and insert it until the limit ring 4121 abuts against the bottom of the lower pressure plate 41. Then place the limit plate 413 on the top of the spline cold pressing mold 412 and thread the fixing bolt 415 through the through hole 414 and into the bolt hole 4124. When installing the fixing bolt 415, a wrench can be used to tighten it in the height space between the connecting plate 43 and the lower pressure plate 41, so that the spline cold pressing mold 412 is fixed. When installing the fixing bolt 415, the other hand should hold the spline cold pressing mold 412 to prevent it from shifting. 2. After installation, the lower pressure plate 41 descends, causing the top of the universal joint to be inserted into the cold pressing hole 4122. The spline is formed by the cold extrusion of the spline rack 4123. After extrusion, the spline cold pressing die 412 is pulled up directly by the lower pressure plate 41, while the universal joint remains in place under the positioning effect, thus completing the cold extrusion process. Spline cold pressing dies 412 with different diameter cold pressing holes 4122 or different numbers of spline racks 4123 can be produced according to the required universal joint size. The outer wall is equipped with limit rings 4121, and the top is also provided with bolt holes 4124 for easy and quick replacement.

[0030] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A high-efficiency cold extrusion processing device for universal joint splines, comprising a processing base (1), characterized in that: Four guide rods (2) are fixedly installed in a rectangular array at the top eccentricity of the processing base (1). A top plate (3) is fixedly installed at the top of the four guide rods (2). A universal joint positioning mechanism (5) is provided at the top center of the processing base (1). A pressing mechanism (4) is provided above the universal joint positioning mechanism (5). The pressing mechanism (4) includes a pressing plate (41). The pressing plate (41) is slidably connected to the four guide rods (2). A hydraulic cylinder (31) is fixedly installed at the top of the top plate (3). Four columns (42) are fixedly installed in a rectangular array at the top of the pressing plate (41). A connecting plate (43) is fixedly installed on the top of the four columns (42). The output end of the hydraulic cylinder (31) extends through to the bottom of the top plate (3) and is fixedly connected to the top center of the connecting plate (43). A mold mounting hole (411) is provided in the center of the lower pressure plate (41). A spline cold pressing mold (412) is engaged in the inner cavity of the mold mounting hole (411). A cold pressing hole (4122) is provided at the bottom center of the spline cold pressing mold (412). Several spline racks (4123) are evenly fixedly installed in a ring array on the inner wall of the cold pressing hole (4122).

2. The high-efficiency cold extrusion processing device for universal joint splines according to claim 1, characterized in that: The top of the spline cold pressing mold (412) is provided with a limiting plate (413). The bottom eccentric part of the limiting plate (413) is in contact with the top of the lower pressure plate (41). A bolt hole (4124) is provided at the center of the top of the spline cold pressing mold (412). The limiting plate (413) is provided with a through hole (414) that runs vertically through the mold. The through hole (414) and the bolt hole (4124) are vertically connected. A fixing bolt (415) is provided in the inner ring of the through hole (414). The bottom end of the fixing bolt (415) is threadedly connected to the bolt hole (4124).

3. The high-efficiency cold extrusion processing device for universal joint splines according to claim 2, characterized in that: A limiting ring (4121) is fixedly installed on the outer wall of the spline cold pressing mold (412), and the top of the limiting ring (4121) is in contact with the bottom of the lower pressure plate (41).

4. The high-efficiency cold extrusion processing device for universal joint splines according to claim 1, characterized in that: The universal joint positioning mechanism (5) includes a positioning placement box (51), which is fixedly installed on the top of the processing base (1). A servo motor (52) is fixedly installed on the left side of the positioning placement box (51). The output shaft of the servo motor (52) passes through the inner cavity of the positioning placement box (51) and is fixedly installed with a positive and negative threaded rod (53). The left and right sides of the outer wall of the positive and negative threaded rod (53) are respectively provided with threaded walls with opposite threads, and the outer walls of the two threaded walls are threaded with movable plates (56). The top of the two movable plates (56) is fixedly installed with gate-shaped clamps (57). The front and rear sides of the top of the positioning placement box (51) are provided with sliding grooves (58) that pass through its inner cavity. The front and rear vertical positions of the two gate-shaped clamps (57) are respectively slidably connected to the front and rear sliding grooves (58).

5. The high-efficiency cold extrusion processing device for universal joint splines according to claim 4, characterized in that: A support column (54) is fixedly installed between the upper and lower sides of the inner wall of the positioning box (51). The support column (54) has a through hole (55) that runs through the left and right sides. The positive and negative threaded rod (53) passes through the through hole (55). A limiting slide rod (59) is fixedly installed between the left and right sides of the inner wall of the positioning box (51). The limiting slide rod (59) is located in front of the positive and negative threaded rod (53). Both of the moving plates (56) are slidably connected to the limiting slide rod (59).

6. The high-efficiency cold extrusion processing device for universal joint splines according to claim 4, characterized in that: The processing base (1) is provided with a rubber pad (511) on its top. The center of the rubber pad (511) is located directly above the support column (54). Extrusion cylindrical blocks (571) are fixedly installed on both the front and rear sides of the two gate-shaped clamps (57). Rubber sleeves (572) are fixedly glued to the outer walls of the two extrusion cylindrical blocks (571) on the opposite sides of the two gate-shaped clamps (57).

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