A helical gear cold extrusion die

Abstract

The utility model discloses a kind of helical gear ring cold extrusion dies, belong to gear ring processing technical field, it includes: die assembly, the die assembly is used to limit the workpiece for processing;Upper pressure assembly, the upper pressure assembly is located the top of the die assembly;The upper pressure assembly moves close to the die assembly, and with the die assembly cooperation extrusion workpiece for processing, make workpiece surface form gear shape;Demoulding assembly, the demoulding assembly is located between the die assembly and the upper pressure assembly;The demoulding assembly is used to limit workpiece position in the process that the upper pressure assembly moves away from the die assembly, make workpiece and upper pressure assembly separate;The application is extruded workpiece for processing by the die assembly and the upper pressure assembly cooperation, make workpiece for processing occur metal plastic flow to generate gear shape, not only completely solve the technical problem that material is seriously wasted by cutting gear shape, can also reduce tool consumption.

Description

Technical Field

[0001] This utility model relates to the field of gear ring processing technology, and more specifically, to a cold extrusion die for a helical gear ring. Background Technology

[0002] With the increasing demands for lightweight automotive transmission systems and higher output power from gearboxes, the design of the core component of planetary mechanisms—the gear ring—is trending towards high precision, high hardness, ultra-thinness, and helical gears. Among these, the cutting, deformation control, and high-precision achievement of helical internal gear rings represent the biggest bottlenecks in enterprise production. Currently, helical gear rings are mostly obtained by cutting gear blanks using hobbing machines, gear shaping machines, or gear milling machines. However, regardless of the method used—hobbing, shaping, milling, or cutting—there are certain limitations in processing helical gear rings.

[0003] 1. A large amount of excess material is removed during the cutting process, resulting in a material waste rate as high as 30% to 50%;

[0004] 2. Multiple processes are involved, resulting in a long production cycle for a single piece, making it difficult to meet the demand for large-volume production;

[0005] 3. Carbide cutting tools wear out quickly, and frequent replacements increase production costs;

[0006] In summary, with the surge in demand for high-precision, high-strength helical gear rings from fields such as new energy vehicles and high-end equipment, traditional helical gear ring processing methods can no longer meet the manufacturing requirements of lightweight, low cost, and high performance. Utility Model Content

[0007] The purpose of this invention is to solve the technical problems of low material utilization, low processing efficiency, high tooling cost, and difficult demolding when using existing equipment to produce and process helical gear rings. Therefore, a cold extrusion die for helical gear rings is proposed.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A cold extrusion die for a helical gear ring includes:

[0010] A die assembly, the die assembly being used to limit the workpiece to be processed;

[0011] An upper pressing assembly is located directly above the die assembly and moves vertically. The upper pressing assembly moves closer to the die assembly and cooperates with the die assembly to press the workpiece to be processed, so that the surface of the workpiece to be processed forms a tooth shape, thus becoming a processed workpiece.

[0012] A demolding assembly is located between the die assembly and the upper pressing assembly and moves in a vertical direction; the demolding assembly is used to restrict the position of the workpiece during the process of the upper pressing assembly moving away from the die assembly, so as to separate the workpiece from the upper pressing assembly;

[0013] The upper pressure assembly includes:

[0014] Upper template, wherein the upper template is a rectangular block structure;

[0015] An upper mold cavity, wherein the upper mold cavity is provided with an internal cavity, and the upper mold cavity is located below the upper template;

[0016] The upper pressure ring has a ring-shaped structure and is sleeved on the outside of the upper mold cavity, pressing and limiting the upper mold cavity to the lower part of the upper template.

[0017] The upper pressure head is cylindrical in shape, with one end connected to the upper mold cavity. The upper pressure head moves synchronously with the upper mold plate.

[0018] An upper fixing ring is provided below the upper mold cavity, and the upper pressure head passes through the upper fixing ring and is fixed in the upper mold cavity by the upper fixing ring;

[0019] An upper pad is disposed directly above the upper die cavity and the upper pressure head, and is used to disperse the punching force applied by the upper pressure head to the upper die plate.

[0020] Furthermore, the die assembly includes:

[0021] The lower template is a rectangular block structure that is parallel to the upper template. The lower template is used to bear the pressure from above.

[0022] Lower mold cavity, wherein a cavity is provided inside the lower mold cavity;

[0023] The lower pressure ring has a ring-shaped structure and is sleeved on the outside of the lower mold cavity, pressing and limiting the lower mold cavity to be located above the lower template.

[0024] A die assembly, the die assembly being generally cylindrical in shape, with an internal cavity for accommodating the workpiece to be processed; the die assembly is fixed within the lower die cavity;

[0025] A lower pad is disposed directly below the lower die cavity and the die assembly, and is used to disperse the punching force applied by the die assembly to the lower die plate.

[0026] Furthermore, the die assembly includes:

[0027] A first die, the first die having an annular structure, is used to provide support under the workpiece;

[0028] The second die has an annular structure and is positioned above the first die to restrict the horizontal movement of the workpiece.

[0029] Furthermore, the upper pressure head includes:

[0030] A guide section is located at the lower end of the upper pressure head, and the diameter of the guide section matches the inner diameter of the first die.

[0031] An extrusion section is located above the guide section. The surface of the extrusion section is uniformly provided with helical teeth along the circumference. The extrusion section is used to contact the workpiece to be processed and to extrude it.

[0032] A connecting section, which is located above the extrusion section and within the upper mold cavity.

[0033] Furthermore, the demolding assembly includes:

[0034] A plurality of demolding tie rods are fixed to the lower pressure ring and perpendicular to the surface of the lower template; a limiting block is provided at the end of each demolding tie rod away from the lower pressure ring;

[0035] A demolding template is provided, which is parallel to the lower template and the upper template. A plurality of demolding tie rods pass through the surface of the demolding template, and the demolding template slides along the demolding tie rods. A return spring is sleeved on the demolding tie rod between the demolding template and the lower pressure ring, for moving the demolding template away from the die assembly. A first through hole is provided in the middle of the demolding template. The center of the first through hole is on the same straight line as the axis of the die assembly. The diameter of the first through hole is adapted to the diameter of the upper pressure head, so that the upper pressure head can pass through the first through hole.

[0036] The bearing housing has an annular structure, with a second through hole in its middle, the diameter of which matches that of the first through hole; the bearing housing is disposed below the demolding template, and the second through hole corresponds to the position of the first through hole; the upper surface of the bearing housing is provided with an annular groove along the circumference.

[0037] A thrust self-aligning roller bearing, located within the annular groove, is used to rotate the bearing housing relative to the ejector plate.

[0038] The bearing pressure ring has a ring-shaped structure and is detachably connected to the lower surface of the release template and sleeved on the outside of the bearing seat.

[0039] A plurality of demolding positioning rods are provided, and the plurality of demolding positioning rods are vertically connected to the lower surface of the upper template.

[0040] A demolding positioning sleeve is disposed on the upper surface of the demolding template, and the number and position of the demolding positioning sleeve correspond to the demolding positioning rod.

[0041] Furthermore, the lower template is provided with a plurality of guide posts, which are perpendicular to the upper surface of the lower template; the lower surface of the upper template is provided with a plurality of guide sleeves, the number and position of which correspond to the guide posts.

[0042] The beneficial effects of this utility model are as follows: The helical gear ring cold extrusion die provided in this application utilizes the "near-net-shape forming" characteristics of metal cold extrusion. By extruding the gear blank through the cooperation of the die assembly and the upper pressure assembly, the gear blank undergoes metal plastic flow to generate the tooth shape. This not only completely solves the technical problem of serious material waste caused by cutting the tooth shape, but also increases the material utilization rate to over 90%. At the same time, it can also reduce tool consumption and reduce the manufacturing cost per piece by 30% to 40%. The helical gear ring cold extrusion die provided in this application can achieve integrated and efficient forming of involute teeth, helical teeth, or other complex irregular teeth by changing the design of the extrusion section on the upper pressure head and cooperating with precise pressure control. This solves the problems of poor adaptability to complex tooth shape processing and many turnover processes in traditional processes, improving processing efficiency by 50% to 70% and ensuring stable tooth shape tolerance. The helical gear ring cold extrusion die provided in this application differs from hot forging. The cold extrusion process does not require high-temperature heating, reducing energy consumption by 60% and eliminating the risk of cutting fluid pollution, which is in line with the trend of green manufacturing. At the same time, it is compatible with large-scale production, suitable for automated production lines, and supports large-scale delivery needs. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of a helical gear ring cold extrusion die provided in an embodiment of this utility model;

[0044] Figure 2 This is a schematic diagram showing the positional relationship between a helical gear ring cold extrusion die and the workpiece provided in an embodiment of this utility model.

[0045] The markings in the diagram are as follows:

[0046] 1. Die assembly;

[0047] 11. Lower mold plate; 111. Guide post; 12. Lower mold cavity; 13. Lower pressure ring; 14. Die assembly; 141. First die; 142. Second die; 15. Lower pad block;

[0048] 2. Upper pressure assembly;

[0049] 21. Upper template; 211. Guide sleeve; 22. Upper mold cavity; 23. Upper pressure ring; 24. Upper pressure head; 241. Guide section; 242. Extrusion section; 243. Connecting section; 25. Upper fixing ring; 26. Upper pad block;

[0050] 3. Demolding assembly;

[0051] 31. Demolding tie rod; 311. Limiting block; 312. Return spring; 32. Demolding template; 33. Bearing housing; 34. Thrust self-aligning roller bearing; 35. Bearing pressure ring; 36. Demolding positioning rod; 37. Demolding positioning sleeve. Detailed Implementation

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0053] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0056] It should be noted that in this embodiment, the workpiece to be processed is a gear blank obtained after pretreatment. The pretreatment includes at least forging, rough turning, and lubrication steps; the workpiece refers to the semi-finished helical gear ring obtained after cold extrusion; please refer to [link to relevant documentation]. Figures 1 to 2 The embodiment of this application shown provides a cold extrusion die for a helical gear ring. In practical applications, the cold extrusion die for a helical gear ring is used to extrude the pre-treated gear blank and form the tooth shape and tooth profile on the inner wall of the gear blank in one step. It can optimize the gear shaping and gear hobbing operation steps in the traditional processing flow, break through the bottleneck of "material reduction" in gear blank cutting, and solve the problem of poor adaptability of traditional processes to different tooth shapes, so as to achieve the technical effect of efficient forming of complex tooth shapes.

[0057] The helical gear ring cold extrusion die includes: a die assembly 1, an upper pressure assembly 2, and a demolding assembly 3; wherein, the die assembly 1 is used to limit the position of the gear blank; the upper pressure assembly 2 is located directly above the die assembly 1 and can move vertically; during the cold extrusion process, the upper pressure assembly 2 moves closer to the die assembly 1 and cooperates with the die assembly 1 to extrude the gear blank, so that the surface of the gear blank forms a tooth shape; the demolding assembly 3 is located between the die assembly 1 and the upper pressure assembly 2 and can move vertically; after the cold extrusion is completed, as the upper pressure assembly 2 moves away from the die assembly 1, the demolding assembly 3 restricts the position of the helical gear ring semi-finished product, so that the helical gear ring semi-finished product separates from the upper pressure assembly 2.

[0058] Specifically, the die assembly 1 includes: a lower template 11, a lower die cavity 12, a lower pressure ring 13, a die assembly 14, and a lower pad block 15; in this embodiment, the lower template 11 is generally in the form of a rectangular block structure, and the lower template 11 is fixed on the ground to bear the pressure transmitted from the upper part and maintain the overall stability of the mold.

[0059] The lower mold cavity 12 has a cylindrical structure, and its interior is a cavity for accommodating the die assembly 14. The lower mold cavity 12 is located above the lower template 11, and its axis is perpendicular to the upper surface of the lower template 11.

[0060] The lower pressure ring 13 has an annular structure, and the inner diameter of the lower pressure ring 13 matches the outer diameter of the lower mold cavity 12. The lower pressure ring 13 is sleeved on the outside of the lower mold cavity 12. As one embodiment of this application, an annular first boss is provided on the bottom of the outer side of the lower mold cavity 12 in the circumferential direction. The inner side of the lower pressure ring 13 is provided with a first slot that matches the first boss. The lower pressure ring 13 is connected to the first slot through the first boss, so that the lower pressure ring 13 overlaps the top of the first boss. Furthermore, the lower pressure ring 13 is also provided with a number of first screw holes. The first screw holes penetrate the upper and lower surfaces of the lower pressure ring 13. The upper surface of the lower template 11 is provided with second screw holes corresponding to the position and number of the first screw holes. The lower pressure ring 13 is locked and fixed by bolts passing through the corresponding first screw holes and second screw holes, so that the lower mold cavity 12 is pressed and limited to the upper part of the lower template 11.

[0061] The die assembly 14 has a cylindrical structure with an internal cavity for accommodating the tooth blank. The outer diameter of the die assembly 14 matches the inner diameter of the lower die cavity 12, and the die assembly 14 is fixed within the lower die cavity 12. In one embodiment of this application, the die assembly 14 includes a first die 141 and a second die 142. Both the first die 141 and the second die 142 have annular structures. During the extrusion process, the tooth blank is placed above the first die 141, which provides support and restricts the vertical movement of the tooth blank. The second die 142 is disposed above the first die 141. In this embodiment, the inner wall of the second die 142 is configured as a stepped structure that adapts to the outer surface of the tooth blank. During the extrusion process, the tooth blank is placed inside the second die 142 and fits against the inner wall of the second die 142. The second die 142 is used to restrict the movement of the tooth blank in the horizontal direction. During the extrusion process, the lower die cavity 12 located outside the second die 142 provides an inward clamping force to the second die 142 in the radial direction to prevent the second die 142 from expanding outward.

[0062] As one embodiment of this application, in order to prevent the die assembly 14 from jumping off the top of the lower die cavity 12 under pressure, an annular second boss is provided on the inner top of the lower die cavity 12 along the circumferential direction, and a second slot adapted to the second boss is provided on the outer side of the second die 142. By having the second boss overlap the second slot, the lower die cavity 12 presses the die assembly 14, thereby fixing the position of the die assembly 14 during the extrusion process and improving the overall integrity of the mold.

[0063] In the above technical solution, the upper surface of the lower template 11 is provided with a first groove, and the lower pad 15 is disposed in the first groove and located directly below the lower mold cavity 12 and the die assembly 14; the lower pad 15 is used to disperse the punching force applied to the lower template 11 by the die assembly 14 during extrusion, and to prevent the lower template 11 from being dented or deformed.

[0064] In order to utilize the plastic flow characteristics of metal so that the tooth blank can be formed into a helical tooth shape in a single extrusion, the upper pressure assembly 2 includes: an upper template 21, an upper mold cavity 22, an upper pressure ring 23, an upper pressure head 24, an upper fixing ring 25, and an upper pad block 26. The upper template 21 has a rectangular block structure, and its size and position correspond to the lower template 11 and are parallel to the lower template 11. The upper template 21 is connected to an external pressurizing device to transmit the pressure applied by the external pressurizing device and move away from or closer to the die assembly 1 after being subjected to force. The external pressurizing device can be a press.

[0065] The upper mold cavity 22 has a cylindrical structure, and its interior is a cavity for accommodating the upper pressure head 24. The upper mold cavity 22 is located below the upper template 21, and the axis of the upper mold cavity 22 and the axis of the lower mold cavity 12 are on the same straight line.

[0066] The inner diameter of the upper pressure ring 23 matches the outer diameter of the upper mold cavity 22, and the upper pressure ring 23 is sleeved on the outside of the upper mold cavity 22. In order to make the upper mold cavity 22 stably connected to the lower part of the upper template 21, as an embodiment of this application, an annular third boss is provided on the top of the outer side of the upper mold cavity 22 in the circumferential direction, and a third groove adapted to the third boss is provided on the inner side of the upper pressure ring 23. The upper mold cavity 22 is connected to the third groove through the third boss, so that the upper mold cavity 22 overlaps the upper part of the third groove. Furthermore, a number of third screw holes are provided on the upper pressure ring 23, and the third screw holes penetrate the upper and lower surfaces of the upper pressure ring 23. The lower surface of the upper template 21 is provided with fourth screw holes corresponding to the position and number of the third screw holes. The upper pressure ring 23 is locked and fixed to the lower part of the upper template 21 by bolts passing through the corresponding third screw holes and fourth screw holes, so that the upper mold cavity 22 is pressed and limited to the lower part of the upper template 21.

[0067] The upper pressure head 24 has a cylindrical structure, with one end connected to the upper mold cavity 22. The upper pressure head 24 moves synchronously with the upper template 21, approaching or moving away from the die assembly 1. The upper pressure head 24 includes a guide section 241, an extrusion section 242, and a connecting section 243. The guide section 241 is located at the lowermost end of the upper pressure head 24. The diameter of the guide section 241 matches the inner diameter of the tooth blank and the inner diameter of the first die 141. When the upper template 21 moves the upper pressure head 24 closer to the die assembly 1, the guide section 241 can pass through the tooth blank placed in the second die 142 and insert into the lower first die 141. After the guide section 241 enters the first die 141, it fits against the inner wall of the first die 141. The first die 141 thereby restricts the lateral movement of the upper pressure head 24 during the extrusion process, achieving a guiding effect.

[0068] The extrusion section 242 of the upper pressure head 24 is located above the guide section 241, and the surface of the extrusion section 242 is uniformly provided with helical teeth along the circumference. During the extrusion process, the upper template 21 drives the upper pressure head 24 to approach the die assembly 1, so that the extrusion section 242 contacts the tooth blank. The upper pressure head 24 moves further to press the helical teeth on the surface of the extrusion section 242 into the tooth blank. The tooth blank undergoes metal plastic flow and forms oblique tooth shape on the inner wall.

[0069] The connecting section 243 of the upper pressure head 24 is located above the extrusion section 242 and connected to the upper mold cavity 22. In order to fix the position of the connecting section 243 in the upper mold cavity 22, the upper fixing ring 25 is set below the upper mold cavity 22. The outer diameter of the upper fixing ring 25 matches the outer diameter of the upper mold cavity 22, and the inner diameter of the upper fixing ring 25 is smaller than the inner diameter of the upper mold cavity 22. The part of the upper fixing ring 25 protruding from the inner wall of the upper mold cavity 22 forms a fourth slot. A fourth annular boss is provided on the connecting section 243 along the circumferential direction. The outer diameter of the fourth boss matches the inner diameter of the upper mold cavity 22. The upper pressure head 24 passes through the upper fixing ring 25 and the fourth boss overlaps the upper slot. The upper fixing ring 25 is used to press the upper pressure head 24, thereby connecting the upper pressure head 24 and the upper mold cavity 22 to form a whole.

[0070] The lower surface of the upper template 21 is provided with a second groove, and the upper pad 26 is disposed in the second groove and located directly above the upper mold cavity 22 and the upper pressure head 24. It can be understood that the upper pad 26 is used to disperse the punching force applied to the upper template 21 by the upper pressure head 24 during extrusion.

[0071] In the above technical solution, the lower template 11 is provided with a plurality of guide posts 111; the guide posts 111 are perpendicular to the upper surface of the lower template 11; the lower surface of the upper template 21 is provided with guide sleeves 211 that are adapted to the guide posts 111; during the process of the upper template 21 moving closer to the lower template 11, the guide posts 111 are inserted into the corresponding guide sleeves 211, so that the upper template 21 drives the upper pressure head 24 to press into the die assembly 1 along the direction of the guide posts 111; the guide posts 111 and the guide sleeves 211 cooperate to accurately guide and position, and guide the upper template 21 to move along a predetermined path during the stamping process, so as to ensure that the die assembly 1 and the upper pressure head 24 are always in the correct positional relationship in the horizontal direction, and the consistency of tooth shape and tooth profile obtained in each cold extrusion.

[0072] To address the problem that traditional copper rod hammering demolding methods easily cause surface damage to the helical gear ring semi-finished product, the demolding assembly 3 includes: demolding pull rod 31, demolding template 32, bearing seat 33, thrust self-aligning roller bearing 34, bearing pressure ring 35, demolding positioning rod 36, and demolding positioning sleeve 37; wherein, several demolding pull rods 31 are fixed on the lower pressure ring 13 and are perpendicular to the plate surface of the lower template 11.

[0073] The demolding template 32 is parallel to the lower template 11 and the upper template 21. Several demolding pull rods 31 pass through the surface of the demolding template 32, and the demolding template 32 slides along the demolding pull rods 31. A limiting block 311 is provided at the end of the demolding pull rod 32 away from the lower pressure ring 13 to prevent the demolding template 32 from slipping out of the demolding pull rod 31. A return spring 312 is sleeved on the demolding pull rod 31 between the demolding template 32 and the lower pressure ring 13. The two ends of the return spring 312 abut against the lower surface of the demolding template 32 and the upper surface of the lower pressure ring 13, respectively, so that the demolding template 32 moves away from the die assembly 1. A first through hole is opened in the middle of the demolding template 32. The center of the first through hole is on the same straight line as the axis of the die assembly 14. The diameter of the first through hole is adapted to the diameter of the upper pressure head 24, so that the upper pressure head 24 can pass through the demolding template 31 through the first through hole during the pressing process.

[0074] The bearing housing 33 has an annular structure, and the middle part of the bearing housing 33 is a second through hole. The diameter of the second through hole matches that of the first through hole. The bearing housing 33 is located below the release template 32, and the second through hole corresponds to the position of the first through hole. The upper surface of the bearing housing 33 is provided with an annular groove along the circumference.

[0075] The thrust self-aligning roller bearing 34 is located in the annular groove of the bearing housing 33. The upper and lower surfaces of the thrust self-aligning roller bearing 34 abut against the release template 32 and the bearing housing 33, respectively, so that the bearing housing 33 can rotate relative to the release template 32.

[0076] The bearing retaining ring 35 has an annular structure, and the inner diameter of the bearing retaining ring 35 matches the outer diameter of the bearing housing 33. The bearing retaining ring 35 is detachably connected to the lower surface of the release template 32 and sleeved on the outside of the bearing housing 33. As one embodiment of this application, an annular fifth boss is provided on the top of the outer side of the bearing housing 33 in the circumferential direction, and a fifth groove that matches the fifth boss is provided on the inner side of the bearing retaining ring 35. By the fifth boss overlapping the fifth groove, the bearing housing 33 can be rotatably connected to the bottom of the release template 32, thereby realizing the limiting and fixing of the thrust self-aligning roller bearing 34.

[0077] Several demolding positioning rods 36 are vertically connected to the lower surface of the upper template 21. The upper surface of the demolding template 32 is provided with demolding positioning sleeves 37 corresponding to the number and position of the demolding positioning rods 36. During the downward movement of the upper template 21, the demolding positioning rods 36 are inserted into the corresponding demolding positioning sleeves 37, so that the upper pressure head 24 passes through the demolding template 32 along the direction of the demolding positioning rods 36. The demolding positioning rods 36 and the demolding positioning sleeves 37 cooperate to position and prevent the upper pressure head 24 from shifting laterally with the demolding template 32 during the movement, thereby ensuring that the demolding template 32 and the upper pressure head 24 are always in the correct positional relationship in the horizontal direction.

[0078] When the helical gear ring cold extrusion die performs the extrusion action, firstly, the upper die plate 21 drives the upper pressure head 24 to move closer to the die assembly 1. After the upper pressure head 24 passes through the ejector plate 32, it continues to descend until the guide section 241 contacts the gear blank placed in the die assembly 14. At this time, the guide post 111 inserts into the guide sleeve 211, and the ejector positioning rod 36 inserts into the ejector positioning sleeve 37 for guidance. After the upper pressure assembly 2 continues to descend a certain distance, the lower surface of the upper fixing ring 25 abuts against the upper surface of the ejector plate 32. The upper pressure assembly 2 continues to descend, and the upper fixing ring 25 presses down on the ejector plate 32 to compress the return spring 312. The ejector plate 32 descends synchronously with the upper pressure assembly 2. When the upper pressure assembly 2 descends, it uses the extrusion section 242 to extrude the gear blank to form a tooth shape. During the extrusion process, the guide section 241 moves past the second die 142 and inserts into the first die 141. After the upper pressure assembly 2 moves to the bearing seat 33 and contacts the die assembly 14, it stops descending, and the gear blank is extruded.

[0079] Since the helical teeth on the extrusion section 242 mesh with the helical gear ring semi-finished product, manual intervention is required to disengage the helical gear ring semi-finished product from the upper pressure head 24. When the helical gear ring cold extrusion die performs the demolding action, the upper pressure assembly 2 is first raised. At this time, the upper pressure head 24 drives the helical gear ring semi-finished product away from the die assembly 1. During this process, since the demolding template 32 is located above the helical gear ring semi-finished product, the demolding template 32 is raised synchronously with the upper pressure head 24 until the demolding template 32 abuts against the limit block 311 and then stops moving. The helical gear ring semi-finished product abuts against the lower surface of the bearing seat 33. As the upper pressure assembly 2 continues to rise, the helical gear ring semi-finished product, the bearing seat 33, and the demolding template 32 rotate relative to each other along the helical gear helical direction, causing the upper pressure head 24 to gradually move away from the helical gear ring semi-finished product until the extrusion section 242 of the upper pressure head 24 completely leaves the helical gear ring semi-finished product. Then the helical gear ring semi-finished product is demolded and the upper pressure assembly 2 is reset.

[0080] This application provides a helical gear ring cold extrusion die that utilizes the "near-net-shape forming" characteristic of metal cold extrusion. The die assembly 1 and the upper pressure assembly 2 work together to extrude the gear blank, causing the blank to undergo plastic flow to form the tooth shape. This not only completely solves the technical problem of severe material waste caused by cutting the tooth shape, increasing material utilization to over 90%, but also reduces tool consumption and lowers the unit manufacturing cost by 30% to 40%. The helical gear ring cold extrusion die provided in this application can achieve integrated and efficient forming of involute teeth, helical teeth, or other complex irregular teeth by changing the design of the upper pressure head 24 and the upper extrusion section 242, combined with precise pressure control. This solves the problems of poor adaptability to complex tooth shape processing and numerous turnover processes in traditional processes, improving processing efficiency by 50%-70% and ensuring stable tooth shape tolerances. The helical gear ring cold extrusion die provided in this application differs from hot forging; the cold extrusion process does not require high-temperature heating, reducing energy consumption by 60% and eliminating the risk of cutting fluid contamination, aligning with the trend of green manufacturing. It is also compatible with large-scale production, suitable for automated production lines, and supports large-scale delivery needs.

[0081] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cold extrusion die for a helical gear ring, characterized in that, include: A die assembly, the die assembly being used to limit the workpiece to be processed; An upper pressing assembly is located directly above the die assembly and moves vertically. The upper pressing assembly moves closer to the die assembly and cooperates with the die assembly to press the workpiece to be processed, so that the surface of the workpiece to be processed forms a tooth shape, thus becoming a processed workpiece. A demolding assembly is located between the die assembly and the upper pressing assembly and moves in a vertical direction; the demolding assembly is used to restrict the position of the workpiece during the process of the upper pressing assembly moving away from the die assembly, so as to separate the workpiece from the upper pressing assembly; The upper pressure assembly includes: Upper template, wherein the upper template is a rectangular block structure; An upper mold cavity, wherein the upper mold cavity is provided with an internal cavity, and the upper mold cavity is located below the upper template; The upper pressure ring has a ring-shaped structure and is sleeved on the outside of the upper mold cavity, pressing and limiting the upper mold cavity to the lower part of the upper template. The upper pressure head is cylindrical in shape, with one end connected to the upper mold cavity. The upper pressure head moves synchronously with the upper mold plate. An upper fixing ring is provided below the upper mold cavity, and the upper pressure head passes through the upper fixing ring and is fixed in the upper mold cavity by the upper fixing ring; An upper pad is disposed directly above the upper die cavity and the upper pressure head, and is used to disperse the punching force applied by the upper pressure head to the upper die plate.

2. The cold extrusion die for a helical gear ring according to claim 1, characterized in that, The die assembly includes: The lower template is a rectangular block structure that is parallel to the upper template. The lower template is used to bear the pressure from above. Lower mold cavity, wherein a cavity is provided inside the lower mold cavity; The lower pressure ring has a ring-shaped structure and is sleeved on the outside of the lower mold cavity, pressing and limiting the lower mold cavity to be located above the lower template. A die assembly, the die assembly being generally cylindrical in shape, with an internal cavity for accommodating the workpiece to be processed; the die assembly is fixed within the lower die cavity; A lower pad is disposed directly below the lower die cavity and the die assembly, and is used to disperse the punching force applied by the die assembly to the lower die plate.

3. The cold extrusion die for a helical gear ring according to claim 2, characterized in that, The die assembly includes: A first die, the first die having an annular structure, is used to provide support under the workpiece; The second die has an annular structure and is positioned above the first die to restrict the horizontal movement of the workpiece.

4. The cold extrusion die for a helical gear ring according to claim 3, characterized in that, The upper pressure head includes: A guide section is located at the lower end of the upper pressure head, and the diameter of the guide section matches the inner diameter of the first die. An extrusion section is located above the guide section. The surface of the extrusion section is uniformly provided with helical teeth along the circumference. The extrusion section is used to contact the workpiece to be processed and to extrude it. A connecting section, which is located above the extrusion section and within the upper mold cavity.

5. A cold extrusion die for a helical gear ring according to claim 3, characterized in that, The demolding assembly includes: A plurality of demolding tie rods are fixed to the lower pressure ring and perpendicular to the surface of the lower template; a limiting block is provided at the end of each demolding tie rod away from the lower pressure ring; A demolding template is provided, which is parallel to the lower template and the upper template. A plurality of demolding tie rods pass through the surface of the demolding template, and the demolding template slides along the demolding tie rods. A return spring is sleeved on the demolding tie rod between the demolding template and the lower pressure ring, for moving the demolding template away from the die assembly. A first through hole is provided in the middle of the demolding template. The center of the first through hole is on the same straight line as the axis of the die assembly. The diameter of the first through hole is adapted to the diameter of the upper pressure head, so that the upper pressure head can pass through the first through hole. The bearing housing has an annular structure, with a second through hole in its middle, the diameter of which matches that of the first through hole; the bearing housing is disposed below the demolding template, and the second through hole corresponds to the position of the first through hole; the upper surface of the bearing housing is provided with an annular groove along the circumference. A thrust self-aligning roller bearing, located within the annular groove, is used to rotate the bearing housing relative to the ejector plate. The bearing pressure ring has a ring-shaped structure and is detachably connected to the lower surface of the release template and sleeved on the outside of the bearing seat. A plurality of demolding positioning rods are provided, and the plurality of demolding positioning rods are vertically connected to the lower surface of the upper template. A demolding positioning sleeve is disposed on the upper surface of the demolding template, and the number and position of the demolding positioning sleeve correspond to the demolding positioning rod.

6. The cold extrusion die for a helical gear ring according to claim 3, characterized in that, The lower template is provided with a plurality of guide posts, which are perpendicular to the upper surface of the lower template; the lower surface of the upper template is provided with a plurality of guide sleeves, the number and position of which correspond to the guide posts.

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