Novel nylon inlaid steel core worm gear and manufacturing process thereof

Abstract

The invention relates to the technical field of mechanical part manufacturing, in particular to a novel manufacturing process for a worm gear with a nylon inlaid steel core. A novel nylon inlaid steel core worm gear manufacturing process is used for manufacturing a novel nylon inlaid steel core worm gear, the worm gear comprises a steel core and a nylon gear ring wrapping the periphery of the steel core, and the novel nylon inlaid steel core worm gear manufacturing process comprises the following steps that steel is subjected to hot forging forming and then subjected to rough cutting machining, and then the steel is subjected to cold extrusion forming; and then the steel core is obtained through fine cutting machining, and the nylon gear ring wraps the periphery of the steel core through an injection molding machine. The worm gear has the following effects that tight combination of the steel core and the nylon gear ring is achieved, the assembly procedure of the worm gear is simplified, the worm gear combines the advantages of different materials, meanwhile, the axial binding force is improved, meanwhile, the structural stability of the worm gear is improved, and the probability that the worm gear is prone to loosening and losing efficacy in the long-term use process is reduced.

Description

Technical Field

[0001] This application relates to the technical field of mechanical parts manufacturing, and in particular to a novel manufacturing process for a worm gear with a nylon-insulated steel core. Background Technology

[0002] In the field of mechanical transmission, worm gear transmission is an important transmission method, widely used in various mechanical equipment, such as machine tools, automobiles, aerospace and other fields. It can achieve a large transmission ratio and has the advantages of compact structure, smooth operation and low noise. It plays a key role in improving the performance and efficiency of mechanical equipment. With the continuous development of industry, the performance requirements of worm gears are also getting higher and higher, especially in terms of load-bearing capacity and impact resistance.

[0003] There are two main conventional methods for manufacturing worm gears: one is integral casting, which involves casting the entire structure of the worm gear directly from a single material. This method is relatively simple and low-cost, but due to the limitations of material properties, its impact resistance and load-bearing capacity often cannot meet the requirements of some special working conditions. The other method is the traditional inlay method, which combines components of different materials through simple assembly or bonding. Although it can combine the advantages of different materials to some extent, in actual use, the axial bonding force is weak, and the structural stability of the worm gear is poor, making the worm gear prone to loosening and failure during long-term use. Summary of the Invention

[0004] In order to improve the axial bonding force, enhance the structural stability of the worm gear, and reduce the probability of loosening and failure during long-term use, this application provides a novel manufacturing process for a worm gear with a nylon-insulated steel core, while combining the advantages of different materials.

[0005] This application provides a novel worm gear manufacturing process with a nylon-inlaid steel core, employing the following technical solution: A novel worm gear with a nylon-inlaid steel core is manufactured, the worm gear comprising a steel core and a nylon gear ring covering the outer periphery of the steel core, comprising the following steps: steel is hot-forged and then rough-cut, followed by cold-extruded forming, and then precision-cut to obtain the steel core; the nylon gear ring is then injection-molded onto the outer periphery of the steel core.

[0006] By adopting the above technical solution and using a combination of hot forging, rough cutting, cold extrusion and precision cutting to prepare the steel core, the metallographic structure of the steel core can be fully optimized, and the overall strength and dimensional accuracy of the steel core can be improved. Subsequently, the nylon gear ring is directly wrapped around the outer periphery of the steel core by injection molding machine, which can achieve a tight combination between the steel core and the nylon gear ring. This simplifies the assembly process of the worm gear, and allows the worm gear to combine the advantages of different materials while improving the axial bonding force. At the same time, it improves the structural stability of the worm gear and reduces the probability of the worm gear loosening and failing during long-term use.

[0007] Preferably, the injection molding machine includes an injection system and a mold clamping structure. The mold clamping structure includes an upper mold and a lower mold, and a mold clamping cavity is formed between the upper mold and the lower mold. The mold clamping cavity is used to mold nylon gear rings. The lower mold has multiple injection holes, one end of which is connected to the injection system, and the other end of which is connected to the mold clamping cavity.

[0008] By adopting the above technical solution, the mold closing structure of the injection molding machine, by setting a mold closing cavity between the upper and lower molds and opening multiple injection holes in the lower mold that are connected to the injection system and the mold closing cavity, enables molten nylon material to be injected into the mold closing cavity synchronously and evenly from multiple points. This avoids problems such as uneven melt flow, local material shortage, or air bubble residue caused by single-point injection, significantly improving the molding quality and dimensional consistency of the nylon gear ring, and ensuring that the thickness and performance of each part of the gear ring are uniform and stable.

[0009] Preferably, the lower mold is provided with a positioning post, which is located at the center of the mold cavity. The positioning post is used for the steel core to be coaxially fitted. The lower mold is also provided with a mounting post, which is fitted onto the mounting post and the positioning post and the mounting post are detachably connected.

[0010] By adopting the above technical solution, the positioning pin set at the center of the lower mold can achieve coaxial and precise fitting of the steel core, ensuring the center positioning accuracy of the steel core in the mold cavity, thereby ensuring the coaxiality of the nylon gear ring and the steel core, and avoiding the problem of eccentric load in the worm gear transmission caused by eccentricity; at the same time, the detachable connection between the positioning pin and the mounting pin makes it easy to replace the appropriate positioning pin according to the size requirements of steel cores of different specifications, improving the versatility and flexibility of the injection mold and reducing the cost of mold modification.

[0011] Preferably, the injection molding machine further includes a mold opening and closing assembly, which is used to drive the upper mold to slide back and forth towards or away from the lower mold and to drive the upper mold to press against the lower mold.

[0012] By adopting the above technical solution, the mold opening and closing assembly can drive the upper mold to slide back and forth precisely and stably press against the lower mold. On the one hand, it can ensure the accurate alignment during the mold closing process and avoid mold damage or flash problems caused by mold closing deviation. On the other hand, the controllable mold closing force can effectively resist the mold cavity pressure of the melt during the injection process and prevent mold overflow. At the same time, the mold closing force can be adjusted according to the injection process requirements of different nylon materials, which improves the adaptability of the process and shortens the auxiliary time for mold opening and closing.

[0013] Preferably, the injection molding machine further includes an ejection assembly and a stripping robot arm. The ejection assembly is used to push the injection-molded nylon gear ring out of the mold cavity. One end of the stripping robot arm is rotatably configured, and the other end of the stripping robot arm is provided with a stripping receiving plate for receiving the nylon gear ring.

[0014] By adopting the above technical solution, the ejection component can smoothly push the molded worm gear out of the mold cavity, avoiding the problems of worm gear deformation and tooth damage caused by manual unloading or hard ejection, thus ensuring the yield of worm gears. With the help of the rotating unloading robot arm and its unloading receiving plate, the unloading and transfer of worm gears can be automated, reducing manual intervention, improving overall production efficiency, reducing the labor intensity of manual operation, and facilitating the connection with subsequent inspection and packaging processes, thus helping to realize assembly line production.

[0015] Preferably, the steel core extends radially outward to form a rim portion, which is embedded in the inner wall of the nylon gear ring. The outer diameter of the rim portion is greater than the inner diameter of the inner wall of the nylon gear ring, and the rim portion and the nylon gear ring form an interference fit.

[0016] By adopting the above technical solution, the radially extending rim of the steel core is embedded in the inner wall of the nylon gear ring and forms an interference fit, which can greatly enhance the mechanical biting force and connection strength between the steel core and the nylon gear ring, effectively limit the relative slippage between the steel core and the nylon gear ring during transmission, avoid the risk of the gear ring loosening or falling off, and improve the stability and service life of the worm gear under high load and high frequency transmission scenarios.

[0017] Preferably, the steel core has at least one protrusion extending along the axial direction of the steel core, and at least one groove is formed on the steel core along the axial direction of the steel core. A plurality of protrusions and a plurality of grooves are arranged alternately on the rim portion along the circumference of the steel core. During the injection molding process, the nylon material is filled into the protrusions and the grooves.

[0018] By adopting the above technical solution, protrusions and grooves are arranged alternately along the circumference of the steel core rim. During the injection molding process, nylon material can fully fill the gap between the protrusions and grooves, which greatly increases the contact area and mechanical meshing area between the steel core and the nylon gear ring, forming a mortise and tenon-like connection structure. This further enhances the connection reliability between the two, effectively resists the torque impact during worm gear transmission, prevents relative rotation or axial movement between the gear ring and the steel core, and adapts to the transmission requirements of higher torque.

[0019] Preferably, the protrusion has a conical or trapezoidal structure, and the diameter of the protrusion gradually increases from the top to the root.

[0020] By adopting the above technical solution, the protrusion is set as a conical or trapezoidal structure with a gradually increasing diameter from the top to the root. On the one hand, this reduces the flow resistance of the molten nylon material during injection molding, making it easier for the melt to quickly and smoothly fill the area around the protrusion and avoid dead corners. On the other hand, after the nylon material cools and shrinks, it forms a reverse clamping structure with the protrusion, which significantly enhances the interlocking effect between the protrusion and the nylon gear ring. Even when the worm gear is subjected to reverse load, it can effectively prevent the nylon gear ring from separating from the steel core, thus improving the anti-detachment ability of the connection structure.

[0021] Preferably, the cross-section of the groove is trapezoidal or semi-circular, and the bottom width of the groove is less than the thickness of the inner wall of the end of the nylon toothed ring.

[0022] By adopting the above technical solution, the cross-section of the groove is set to trapezoidal or semi-circular, and the bottom width of the groove is controlled to be less than the thickness of the inner wall of the nylon gear ring end. This not only increases the mechanical interlocking effect between the steel core and the nylon through the structure of the groove, but also avoids the nylon gear ring end wall thickness being too thin due to the groove being too deep. This ensures the structural strength of the nylon gear ring end and prevents the worm gear from cracking or breaking due to stress concentration at the end during long-term operation, thus balancing connection reliability and gear ring structural integrity.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By combining the advantages of different materials, the worm gear can improve the axial bonding force, enhance the structural stability of the worm gear, and reduce the probability of the worm gear loosening and failing during long-term use; 2. During the injection molding process, the nylon material can fully fill the gap between the protrusions and the grooves, which greatly increases the contact area and mechanical meshing area between the steel core and the nylon gear ring, further strengthening the connection reliability between the two. It can effectively resist the torque impact during the worm gear transmission process, prevent the gear ring and the steel core from rotating relative to each other or moving axially, and adapt to the transmission requirements of higher torque. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a novel nylon-inlaid steel core worm gear according to this application; Figure 2 This is a cross-sectional structural schematic diagram of a novel worm gear with a nylon inlaid steel core according to this application; Figure 3 This is a schematic diagram of the steel core structure of a novel nylon-inlaid steel core worm gear according to this application; Figure 4 This is a schematic diagram of the manufacturing process of a novel nylon-inlaid steel core worm gear according to this application; Figure 5 This is a schematic diagram of the overall structure of the injection molding machine in the manufacturing process of a novel nylon-inlaid steel core worm gear according to this application; Figure 6 This is a cross-sectional schematic diagram of a portion of the structure of an injection molding machine in a novel nylon-inlaid steel core worm gear manufacturing process according to this application; Figure 7 yes Figure 5 A magnified view of part A in the middle; Figure 8 This is a partial structural schematic diagram of the injection molding machine used in the manufacturing process of a novel nylon-inlaid steel core worm gear according to this application.

[0025] Explanation of reference numerals in the attached drawings: 110, steel core; 111, rim; 112, protrusion; 113, groove; 120, nylon toothed ring; 210, injection system; 220, mold closing structure; 221, upper mold; 222, lower mold; 223, mold closing cavity; 224, injection hole; 225, positioning pin; 226, mounting pin; 227, connecting bolt; 230, mold opening and closing assembly; 240, ejection assembly; 241, top plate; 242, ejection cylinder; 250, unloading robotic arm; 251, robotic arm; 252, drive cylinder. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] This application discloses a novel manufacturing process for a worm gear with a nylon inlaid steel core. This process is used to manufacture a novel worm gear with a nylon inlaid steel core, which combines the advantages of different materials, improves the axial bonding force, enhances the structural stability of the worm gear, and reduces the probability of the worm gear loosening and failing during long-term use.

[0028] refer to Figures 1-3A novel worm gear with a nylon-embedded steel core includes a steel core 110 and a nylon gear ring 120 covering the outer periphery of the steel core 110. The radially outwardly extending rim portion 111 of the steel core 110 is embedded in the inner wall of the nylon gear ring 120. The rim portion 111 is annular and surrounds the outer periphery of the steel core 110, possessing high strength and hardness to ensure it can withstand certain pressure without deformation when mating with the nylon gear ring 120. The rim portion 111 and the steel core 110 are integrally formed, and the outer diameter of the rim portion 111 is greater than that of the nylon gear ring 120. The inner diameter of the inner wall and the function of the rim 111 are to be embedded in the inner wall of the nylon gear ring 120, so that the rim 111 and the nylon gear ring 120 form an interference fit. The interference fit can effectively enhance the axial bonding force between the steel core 110 and the nylon gear ring 120. Because the interference fit generates a large friction force between the two, the nylon gear ring 120 is not easy to fall off the steel core 110 during the operation of the worm gear. This allows the worm gear to improve the axial bonding force while combining the advantages of different materials, and reduces the probability of the worm gear loosening and failing during long-term use.

[0029] Specifically, at least one protrusion 112 extends along the axial direction of the steel core 110, and at least one groove 113 is formed along the axial direction of the steel core 110. Multiple protrusions 112 and multiple grooves 113 are arranged alternately along the circumference of the steel core 110 on the rim portion 111. The protrusions 112 and grooves 113 increase the contact area and the complexity of the connection between the steel core 110 and the nylon gear ring 120, making the nylon gear ring 120 more stable on the steel core 110. When the worm gear is working, whether it is normal rotation or impact, the nylon gear ring 120 can be tightly connected with the steel core 110 and will not easily separate. In this embodiment, both ends of the rim portion 111 have protrusions 112 and grooves 113, and one end face of the rim portion 111 has a protrusion 112, while the corresponding other end face of the rim portion 111 has a groove 113.

[0030] The protrusion 112 has a conical or trapezoidal structure, and the diameter of the protrusion 112 gradually increases from the top to the root. This structural design is conducive to the nylon material better wrapping the protrusion 112 during injection molding, increasing the strength of the bond. Correspondingly, the cross-section of the groove 113 is trapezoidal or semi-circular, and the bottom width of the groove 113 is smaller than the thickness of the inner wall of the end of the nylon toothed ring 120. The function of the groove 113 structure is to allow the nylon material to flow into it during injection molding, further enhancing the bonding force between the steel core 110 and the nylon toothed ring 120, while improving the flow performance of the nylon material.

[0031] The nylon gear ring 120 is made of nylon material, which has good wear resistance and self-lubricating properties, and can reduce wear and noise in the worm gear transmission process. The nylon gear ring 120 is annular in shape, with holes inside that match the rim portion 111 of the steel core 110. The nylon gear ring 120 is wrapped around the outer periphery of the steel core 110 by injection molding. During injection molding, high-temperature molten nylon material is injected into the mold and fills the protrusions 112 and grooves 113 around the steel core 110. After cooling, the nylon gear ring 120 is formed and tightly bonded to the steel core 110.

[0032] In this embodiment, reference Figure 4 By rationally combining hot forging, machining, cold extrusion and injection molding processes, a firm bond is achieved between the steel core 110 and the nylon gear ring 120, while simplifying traditional process steps, improving production efficiency and reducing environmental impact.

[0033] First, the steel core 110 is prepared. A suitable steel is selected and heated to a suitable temperature to give the steel good plasticity. Then, the steel is forged into a blank structure that is close to the shape of the steel core 110 through a forging die. Hot forging can improve the metallographic structure inside the steel and improve the overall strength and toughness of the steel core 110. After hot forging, the steel core 110 blank is rough cut using a cutting machine tool to remove excess material and preliminarily determine the basic size and shape of the steel core 110, laying the foundation for subsequent precision machining.

[0034] After rough cutting, the steel core 110 is placed in a cold extrusion die, and pressure is applied by a press to cause plastic deformation of the steel core 110, thereby directly forming structures such as protrusions 112 and grooves 113 on the steel core 110. The cold extrusion process can significantly improve the dimensional accuracy and surface quality of these structures, while enhancing the surface hardness and overall strength of the steel core 110. Compared with the traditional process, this embodiment directly forms the protrusions 112 and grooves 113 by cold extrusion, avoiding subsequent complex cutting processes and effectively simplifying the process flow.

[0035] After cold extrusion, the steel core 110 is precision machined to further improve its dimensional accuracy and surface finish. Key parts of the steel core 110 are finely machined using high-precision cutting equipment to ensure that they fully meet the design requirements. This embodiment eliminates the phosphating treatment step of the steel core 110 in the traditional process, thereby reducing environmental pollution caused by chemical treatment, while also reducing material consumption and production costs, making the entire steel core 110 preparation process more environmentally friendly and efficient.

[0036] After the steel core 110 is prepared, it is placed in an injection molding machine to cover the nylon gear ring 120.

[0037] Specifically, refer to Figures 5-8 The injection molding machine includes an injection system 210 and a mold clamping structure 220. The injection system 210 includes a hopper, a screw, a heating element, and a nozzle. The funnel-shaped hopper is used to store nylon raw materials and to pour and transport them. The screw rotates under the drive of a motor, pushing the nylon raw materials in the hopper forward. The heating element generally uses resistance wire heating, which can precisely control the temperature to bring the nylon raw materials to a suitable molten state. The nozzle sprays the molten nylon material into the mold clamping structure 220. The mold clamping structure 220 includes an upper mold 221 and a lower mold 222. After the upper mold 221 and the lower mold 222 are closed, they form a mold cavity 223 for molding the nylon gear ring 120. The lower mold 222 has multiple injection holes 22. 4. One end of the injection hole 224 is connected to the nozzle of the injection system 210, and the other end of the injection hole 224 is connected to the mold cavity 223. The number and distribution of the injection holes 224 can be reasonably designed according to the size and shape of the nylon gear ring 120. Molten nylon material is evenly injected into the mold cavity 223 through the injection hole 224, so that the nylon material can fully cover the outer periphery of the steel core 110. During the injection molding process, the molten nylon material will flow into and fill the protrusions 112 and grooves 113 on the steel core 110, forming a tight mechanical interlocking structure with the steel core 110, which improves the molding quality of the worm gear. In this embodiment, a total of four injection holes 224 are provided, which are evenly distributed circumferentially at the bottom of the lower mold 222.

[0038] To ensure the accurate positioning of the steel core 110 within the mold cavity 223, the lower mold 222 is equipped with a positioning post 225 and a mounting post 226. The positioning post 225 is located at the center of the mold cavity 223 and is used for coaxial mounting of the steel core 110. The positioning post 225 is cylindrical, and its diameter and height are precisely designed according to the inner diameter of the steel core 110 to ensure that the steel core 110 can be accurately fitted onto the positioning post 225. This ensures the accurate centering of the steel core 110 during the injection molding process and guarantees the subsequent mating of the nylon gear ring 120 with the steel core 110. To ensure coaxiality, in other embodiments, the top end of the positioning post 225 can be set in a conical or arc shape to facilitate the insertion of the steel core 110; the positioning post 225 is sleeved on the mounting post 226 and the positioning post 225 and the mounting post 226 are detachably connected, and different positioning posts 225 can be replaced according to the inner diameter of the steel core 110. In this embodiment, four connecting bolts 227 are provided on the side wall of the positioning post 225. The four connecting bolts 227 are evenly distributed circumferentially on the positioning post 225, and the connecting bolts 227 pass through the positioning post 225 and the mounting post 226 in sequence along the radial direction of the positioning post 225.

[0039] In addition, the injection molding machine also includes a mold opening and closing assembly 230, an ejection assembly 240, and a material unloading robotic arm 250. The mold opening and closing assembly 230 is used to drive the upper mold 221 to slide back and forth towards or away from the lower mold 222, and to drive the upper mold 221 to press against the lower mold 222. When mold closing is required, the mold opening and closing assembly 230 drives the upper mold 221 to move downward until the upper mold 221 is tightly pressed against the lower mold 222, ensuring the sealing of the mold cavity 223, preventing nylon material leakage, and ensuring the molding quality of the worm gear. After injection molding is completed, the mold opening and closing assembly 230 drives the upper mold 221 to move upward, realizing mold opening. In this embodiment, the mold opening and closing assembly 230 includes a hydraulic cylinder, which is the power source for mold opening and closing. Power is provided by the hydraulic system to push the piston rod to make linear motion. The piston rod of the hydraulic cylinder is connected to the upper mold 221, converting the linear motion of the hydraulic cylinder into the reciprocating motion of the upper mold 221.

[0040] Ejection assembly 240 is used to push the injection-molded nylon gear ring 120 out of the mold cavity 223. One end of the unloading robot arm 250 is rotatably set, and the other end of the unloading robot arm 250 is provided with an unloading receiving plate to receive the nylon gear ring 120. Ejection assembly 240 includes top plate 241 and ejection cylinder 242. Ejection cylinder 242 provides ejection power and controls the movement of its piston rod through a hydraulic system to push top plate 241 against nylon gear ring 120, thus ejecting nylon gear ring 120 from the mold cavity 223. Unloading robot arm 250 includes robot arm 251 and drive cylinder 252. Robot arm 251 is made of lightweight materials such as aluminum alloy or carbon fiber, which has high strength and light weight, and facilitates rapid rotation and movement. The drive cylinder 252 provides power for the movement of the robotic arm 251. Through precise control algorithms, the robotic arm 251 can drive the unloading receiving plate to rotate to the appropriate position, aligning the unloading receiving plate with the ejected nylon gear ring 120. Then, the nylon gear ring 120 is received on the unloading receiving plate. After that, the unloading robotic arm 250 rotates to the designated unloading position and puts down the nylon gear ring 120. This collaborative working method improves the automation level and production efficiency of worm gear manufacturing and reduces the workload and errors of manual operation.

[0041] The implementation principle of a novel nylon-inlaid steel core worm gear manufacturing process according to an embodiment of this application is as follows: First, in the preparation stage of the steel core 110, hot forging can improve the metallographic structure inside the steel, increase the overall strength and toughness of the steel core 110, and enable the steel core 110 to withstand greater torque and impact in subsequent transmission. Rough cutting is used to remove the excess material generated by hot forging, so that the steel core 110 forms a basic outline; then, through cold extrusion, protrusions 112 and grooves 113 can be directly formed on the steel core 110, forming a mechanical interlock with the nylon material in the subsequent injection molding process, significantly improving the bonding strength between the steel core 110 and the nylon gear ring 120.

[0042] During the injection molding stage, the positioning post 225 ensures that the steel core 110 and the mold cavity 223 are coaxial, thereby ensuring the coaxiality of the nylon gear ring 120 with the steel core 110 after molding and avoiding uneven load or vibration of the worm gear during transmission. The injection system 210 injects molten nylon material into the mold cavity 223 simultaneously through multiple injection holes 224 on the lower mold 222, so that the nylon material can evenly and quickly cover the outer periphery of the steel core 110 and fully fill the protrusions 112 and grooves 113 on the steel core 110. The nylon material will shrink during the cooling process. Since the protrusions 112 are made of... With a conical or trapezoidal structure, the width at the base of the protrusion 112 is greater than the width at the top. After the nylon material shrinks, it will generate a radial clamping force on the protrusion 112, forming a reverse clamping effect, making the connection between the nylon gear ring 120 and the steel core 110 more secure. The trapezoidal or semi-circular structure of the groove 113 further increases the contact area between the steel core 110 and the nylon gear ring 120, and after being filled with nylon material, it forms a mortise and tenon-like structure, which effectively resists the torque and shear force generated by the worm gear during transmission, and prevents the nylon gear ring 120 and the steel core 110 from rotating relative to each other or moving axially.

[0043] The interference fit between the rim 111 and the nylon gear ring 120 further enhances the bonding strength between the two, which improves the axial bonding force and structural stability of the worm gear while combining the advantages of different materials. This allows the worm gear to maintain structural stability under high load and high frequency transmission conditions, making it less prone to loosening or falling off of the gear ring, and reducing the probability of the worm gear loosening and failing during long-term use.

[0044] The mold opening and closing assembly 230 of the injection molding machine provides a stable mold closing force, ensuring that the mold remains sealed during the injection process, preventing overflow, and guaranteeing the molding quality of the nylon gear ring 120. After injection molding, the ejection assembly 240 smoothly ejects the molded worm gear, and the unloading robotic arm 250 transfers it to subsequent processes, realizing automated production, improving production efficiency, and reducing the risk of damage caused by manual operation.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel manufacturing process for a worm gear with a nylon-insulated steel core, characterized in that: The method for manufacturing a new type of worm gear with a nylon inlaid steel core, the worm gear comprising a steel core (110) and a nylon gear ring (120) covering the outer periphery of the steel core (110), includes the following steps: the steel is hot-forged and then rough-cut, then the steel is cold-extruded and then fine-cut to obtain the steel core (110), and the nylon gear ring (120) is covered on the outer periphery of the steel core (110) by an injection molding machine.

2. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 1, characterized in that: The injection molding machine includes an injection system (210) and a mold clamping structure (220). The mold clamping structure (220) includes an upper mold (221) and a lower mold (222). A mold clamping cavity (223) is formed between the upper mold (221) and the lower mold (222). The mold clamping cavity (223) is used to mold a nylon gear ring (120). The lower mold (222) has multiple injection holes (224). One end of the injection hole (224) is connected to the injection system (210), and the other end of the injection hole (224) is connected to the mold clamping cavity (223).

3. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 2, characterized in that: The lower mold (222) is provided with a positioning post (225), which is located at the center of the mold cavity (223). The positioning post (225) is used for the steel core (110) to be coaxially sleeved. The lower mold (222) is also provided with a mounting post (226), which is sleeved on the mounting post (226) and the positioning post (225) and the mounting post (226) are detachably connected.

4. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 3, characterized in that: The injection molding machine further includes a mold opening and closing assembly (230), which is used to drive the upper mold (221) to slide back and forth towards or away from the lower mold (222) and to drive the upper mold (221) to press against the lower mold (222).

5. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 4, characterized in that: The injection molding machine also includes an ejector assembly (240) and a stripper arm (250). The ejector assembly (240) is used to push the injection-molded nylon gear ring (120) out of the mold cavity (223). One end of the stripper arm (250) is rotatably set, and the other end of the stripper arm (250) is provided with a stripper receiving plate to receive the nylon gear ring (120).

6. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 1, characterized in that: The steel core (110) extends radially outward to have a rim portion (111), which is embedded in the inner wall of the nylon gear ring (120). The outer diameter of the rim portion (111) is greater than the inner diameter of the inner wall of the nylon gear ring (120), and the rim portion (111) and the nylon gear ring (120) form an interference fit.

7. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 6, characterized in that: At least one protrusion (112) extends along the axial direction of the steel core (110), and at least one groove (113) is formed along the axial direction of the steel core (110). A plurality of protrusions (112) and a plurality of grooves (113) are arranged alternately along the circumference of the steel core (110) on the rim portion (111). During the injection molding process, the injection molding machine fills the protrusions (112) and the grooves (113) with nylon material.

8. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 7, characterized in that: The protrusion (112) has a conical or trapezoidal structure, and the diameter of the protrusion (112) gradually increases from the top to the root.

9. The manufacturing process of a novel worm gear with a nylon-inlaid steel core according to claim 8, characterized in that: The cross-section of the groove (113) is trapezoidal or semi-circular, and the bottom width of the groove (113) is less than the thickness of the inner wall of the end of the nylon toothed ring (120).

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