A self-guiding thread die for preventing loosening of a screw
By setting U-shaped, prismatic, and standard thread rolling grooves on the thread rolling plate, various thread profile screws can be formed, solving the problems of high processing cost and poor anti-loosening effect of existing thread rolling plates, and realizing stable fastening of screws in vibration environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIYA RDP MOULD JIAXING CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-06-19
AI Technical Summary
Existing thread rolling dies can only produce screws with a single thread, resulting in a high risk of loosening in vibrating environments, high processing costs, and the inability to avoid misalignment and stripping during initial assembly.
Design a thread rolling plate for anti-loosening self-guiding screws. The main thread rolling plate and the auxiliary thread rolling plate are equipped with U-shaped thread rolling grooves, rhomboid thread rolling grooves and standard thread rolling grooves to form U-shaped teeth, wavy teeth and standard teeth. Automatic guidance is achieved through multiple thread contacts to increase the tightening effect.
This technology improves the anti-loosening performance of screws in vibrating environments, reduces processing costs, avoids stripping and misalignment of threads, and extends the service life of fasteners.
Smart Images
Figure CN224372680U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thread rolling plate technology for screw production, and in particular to a thread rolling plate for anti-loosening and self-guiding screws. Background Technology
[0002] Thread rolling dies are the most common thread-making tools in the fastener industry, including standard and non-standard custom parts, for machining screws and bolts. Common standard mechanical thread rolling dies can only produce one type of thread, resulting in relatively simple and limited screw threads with limited applications. In the automotive industry, screws also face the risk of loosening due to long-term vehicle vibrations. During assembly, misalignment and stripping can easily occur due to initial misfitting with other parts. Further machining of single-thread screws and bolts to improve tightness would undoubtedly increase labor and material costs, hindering the smooth operation of businesses. Therefore, there is a need to develop a thread rolling die capable of producing multiple thread types in a single operation.
[0003] The Chinese patent publication number CN210586922U is called a thread rolling plate, which includes a stationary thread plate and a moving thread plate. The stationary thread plate and the moving thread plate are adjusted by a thread rolling machine to form a gap for the screw blank to pass through. The moving thread plate moves relative to the stationary thread plate. The stationary thread plate has a guide area for the threaded front end of the moving thread plate and an exit area for the threaded outlet end. The moving thread plate moves linearly toward the stationary thread plate to roll into a screw that has not only a single thread but also a double thread.
[0004] The aforementioned prior art utilizes a unidirectional thread structure to process the fastening device using a thread rolling die. For a bidirectional thread structure, an additional thread rolling die is required for processing. This results in high manufacturing costs for individual screws, poor anti-loosening performance in vibrating environments, and the produced screws lack guiding function, making it impossible to avoid misalignment and stripping during initial assembly with other components. Utility Model Content
[0005] In view of this, the present invention provides a thread rolling plate for anti-loosening self-guiding screws to solve the above-mentioned technical problems.
[0006] A thread rolling slab for anti-loosening self-guiding screws includes a main thread rolling slab and a secondary thread rolling slab. Both the main and secondary thread rolling slabs include a working surface disposed opposite to each other, multiple U-shaped thread rolling grooves respectively disposed on the two working surfaces near their length sides, multiple prismatic thread rolling grooves disposed on the working surfaces located on one side of the U-shaped thread rolling grooves, and at least one standard thread rolling groove with one end connected to the prismatic thread rolling groove. The prismatic thread rolling groove includes multiple thread rolling groups and multiple connecting groups disposed between two adjacent thread rolling groups. Each thread rolling group includes a first machining surface, two second machining surfaces disposed at both ends of the first machining surface, a pair of third machining surfaces respectively disposed on both sides of the first machining surface, and two pairs of fourth machining surfaces respectively disposed on both sides of the two third machining surfaces. The second machining surfaces at both ends are inclined to the same side, and the angle between them and the first machining surface is an obtuse angle, with an angle between 130° and 175°. Each connecting group includes a first connecting surface and two second connecting surfaces respectively connected to the other two ends of the connecting surface. The first connecting surface is connected to two second processing surfaces at both ends, and each second connecting surface is connected to two fourth processing surfaces at both ends. A portion of the standard thread rolling groove is embedded in a U-shaped thread rolling groove adjacent to the prismatic thread rolling groove, and the other end is connected to the prismatic thread rolling groove.
[0007] Furthermore, the length of the main tooth plate is less than the length of the auxiliary tooth plate.
[0008] Furthermore, the U-shaped tooth groove, the rhomboid tooth groove, and the standard tooth groove have the same inclination angle.
[0009] Furthermore, the working surface protrudes from the opposite end faces of the main tooth plate and the auxiliary tooth plate.
[0010] Furthermore, one side of the working surface is flush with one side of the main tooth plate and the auxiliary tooth plate.
[0011] Furthermore, the width of the working surface is smaller than the width of the main tooth plate and the auxiliary tooth plate, and the length is the same as the length of the main tooth plate and the auxiliary tooth plate.
[0012] Furthermore, the two sides of the U-shaped tooth-rolling groove are inclined in opposite directions, and multiple U-shaped tooth-rolling grooves are arranged on the side of the working surface away from the main tooth plate and the side of the auxiliary tooth plate.
[0013] Furthermore, the depth of the U-shaped tooth ridge is at most one-half the depth of the standard tooth ridge.
[0014] Furthermore, the depth of the rhomboid tooth groove is greater than the depth of the standard tooth groove.
[0015] Furthermore, the length of the first processed surface is the same as the length of the third processed surface, and the length of the second processed surface is the same as the length of the fourth processed surface.
[0016] Compared with existing technologies, the thread rolling plate of this utility model for anti-loosening self-aligning screws has a working surface on both the main thread rolling plate and the auxiliary thread rolling plate. A U-shaped thread rolling groove is provided on the working surface, forming U-shaped teeth on the screw. This allows the screw to contact multiple threads simultaneously during insertion, achieving automatic alignment and preventing thread rolling and stripping, thus reducing the additional costs caused by damage to the workpiece. A prismatic thread rolling groove is provided on one side of the U-shaped thread rolling groove. Multiple sets of thread rolling groups with different inclination angles, and two connecting groups between two adjacent thread rolling groups, form wavy teeth on the screw, avoiding a wavy line. A standard thread rolling groove is provided between the U-shaped and prismatic thread rolling grooves for further positioning. The surface undulations of the wavy teeth increase the contact area with the workpiece, thereby enhancing the tightening effect. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a thread rolling plate for an anti-loosening self-guiding screw provided by this utility model.
[0018] Figure 2 for Figure 1 A magnified view of part A of the thread rolling plate of the anti-loosening self-guiding screw.
[0019] Figure 3 for Figure 1 A magnified view of part B of the thread rolling plate for the anti-loosening self-guiding screw.
[0020] Figure 4 for Figure 1 A schematic diagram of the screw structure produced by the thread rolling die for anti-loosening self-guiding screws. Detailed Implementation
[0021] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.
[0022] like Figures 1 to 4 The diagram shows a structural schematic of a thread rolling plate for an anti-loosening self-guiding screw provided by this utility model. The thread rolling plate includes a main thread plate 10 and a secondary thread plate 20. It is conceivable that the thread rolling plate for the anti-loosening self-guiding screw also includes other functional structures, such as a fixing structure, a horizontal drive mechanism, and an installation structure, etc., which are technologies known to those skilled in the art and will not be described in detail here.
[0023] The screws threaded by the main thread plate 10 and the auxiliary thread plate 20 are composed of a screw 1, U-shaped teeth 2, wavy teeth 3, standard teeth 4, and a nut 5.
[0024] The length of the main thread plate 10 is less than the length of the auxiliary thread plate 20. During thread rolling, the thread blank can be pre-fitted to the auxiliary thread plate 20, allowing the main thread plate 10 to better cooperate with the auxiliary thread plate 20 for thread rolling. The length structure between the main thread plate 10 and the auxiliary thread plate 20 is existing technology and will not be described in detail here.
[0025] The main tooth plate 10 and the auxiliary tooth plate 20 each include a working surface 11 arranged opposite to each other, multiple U-shaped tooth grooves 12 respectively arranged on the two working surfaces 11 near the length side, multiple rhomboid tooth grooves 13 arranged on the working surface 11 located on one side of the U-shaped tooth grooves 12, and at least one standard tooth groove 14 with one end connected to the rhomboid tooth groove 13.
[0026] The U-shaped thread rolling groove 12, the prismatic thread rolling groove 13, and the standard thread rolling groove 14 have the same inclination angle, which allows the various threaded parts after thread rolling to be smoothly connected and avoids material blockage.
[0027] One side of the working surface 11 is flush with one end face of the main thread plate 10 and the auxiliary thread plate 20. The width of the working surface 11 is less than the width of the main thread plate 10 and the auxiliary thread plate 20, and the length is the same as the length of the main thread plate 10 and the auxiliary thread plate 20. The width of the working surface 11 can be designed according to the length of the screw to be threaded, so as to produce screws of different lengths.
[0028] The working surface 11 protrudes from the opposite end faces of the main tooth plate 10 and the auxiliary tooth plate 20, so that after the two working surfaces 11 come into contact, the main tooth plate 10 and the auxiliary tooth plate 20 will not come into contact with the screw, thus avoiding affecting the subsequent thread rolling.
[0029] The two sides of the U-shaped thread groove 12 are inclined in opposite directions. Multiple U-shaped thread grooves 12 are arranged on the side of the working surface 11 away from the main thread plate 10 and the side of the auxiliary thread plate 20. U-shaped teeth 2 are rolled out at one end near the screw 1. The tooth crest width is greater than that of a standard thread, allowing simultaneous contact with multiple threads during insertion, thus providing an automatic alignment function. This avoids the risk of stripping due to tilting of the insert or incomplete fit between the teeth and the insert. The depth of the U-shaped thread groove 12 is at most half the depth of the standard thread groove 14, so that the tips of the standard teeth 4 on the screw 1 can further engage with the threads for positioning.
[0030] The depth of the prismatic groove 13 is greater than the depth of the standard groove 14, so that the height of the wavy teeth 3 on the screw 1 is greater than the height of the standard teeth 4. This allows the wavy teeth 3 to be screwed into the thread of the workpiece to the maximum extent. The surface undulation of the wavy teeth 3 scrapes the thread surface, increasing the smoothness of the insertion. Furthermore, the surface undulation of the wavy teeth 3 increases the contact area with the workpiece, thereby increasing the fastening effect and improving the anti-loosening performance against vibration.
[0031] The rhomboid tooth-rolling groove 13 includes multiple tooth-rolling groups 131 and multiple connecting groups 132 disposed between two adjacent tooth-rolling groups 131.
[0032] Please see Figure 2 The tooth-rubbing assembly 131 includes a first processing surface 1311, two second processing surfaces 1312 disposed at both ends of the first processing surface 1311, a pair of third processing surfaces 1313 disposed on both sides of the first processing surface 131, and two pairs of fourth processing surfaces 1314 disposed on both sides of the two third processing surfaces 1313.
[0033] The length of the first machined surface 1311 is the same as the length of the third machined surface 1313, and the length of the second machined surface 1312 is the same as the length of the fourth machined surface 1314. The second machined surfaces 1312 at both ends are inclined to the same side, and the angle between them and the first machined surface 1311 is an obtuse angle, ranging from 130° to 175°. Please continue reading. Figure 2 Furthermore, since the two third processing surfaces 1313 are respectively connected to both sides of the first processing surface 1311, and the two pairs of fourth processing surfaces 1314 are respectively connected to both sides of the two second processing surfaces 1312, the included angle between the two fourth processing surfaces 1314 and the third processing surface 1313 is also an obtuse angle, thereby allowing the first processing surface 1311, the second processing surface 1312, the third processing surface 1313, and the fourth processing surface 1314 to form wavy teeth 3 on the screw 1 by rolling teeth.
[0034] The connecting group 132 includes a first connecting surface 1321 and two second connecting surfaces 1322 respectively connected to the other two ends of the connecting surface 1321. The two ends of the first connecting surface 1321 are respectively connected to two second machining surfaces 1312, and the two ends of each second connecting surface 1322 are respectively connected to two fourth machining surfaces 1314. The connecting group 132 serves as a transition between the two thread rolling groups 131 to prevent the multiple thread rolling groups 131 from intersecting when rolling threads on the screw 1, thus ensuring smooth undulation of the wavy teeth 3 and reducing the resistance to penetration.
[0035] A portion of the standard tooth groove 14 is embedded in the U-shaped tooth groove 12 adjacent to the rhomboid tooth groove 13, and the other end is connected to the rhomboid tooth groove 13, thereby serving to transition from the U-shaped tooth 2 to the wavy tooth 3, avoiding jamming due to excessive height difference when directly transitioning from the U-shaped tooth 2 to the wavy tooth 3.
[0036] In use, the working surfaces 11 of the main tooth plate 10 and the auxiliary tooth plate 20 are placed opposite each other and staggered. The main tooth plate 10 or the auxiliary tooth plate 20 is fixed, and another tooth plate is placed on the thread rolling machine. The screw 1 is placed between the two working surfaces 11 and pressed tightly. The thread rolling machine is started to make the main tooth plate 10 and the auxiliary tooth plate 20 move towards each other until the working surfaces 11 of the main tooth plate 10 and the auxiliary tooth plate 20 no longer overlap, which completes one thread rolling cycle.
[0037] Compared with the prior art, the thread rolling plate of the present invention provides an anti-loosening self-guiding screw by setting a working surface 11 on the main thread plate 10 and the auxiliary thread plate 20 respectively. A U-shaped thread rolling groove 12 is set on the working surface 11, and U-shaped teeth 2 are formed on the screw 1, allowing the screw to contact multiple threads simultaneously during insertion, achieving automatic guidance, avoiding thread rolling and stripping, and reducing the additional costs caused by damage to the workpiece. A prismatic thread rolling groove 13 is set on one side of the U-shaped thread rolling groove 12. Multiple sets of thread rolling groups 131 with different inclined angles and two connecting groups 132 set between two adjacent thread rolling groups 131 form wavy teeth 3 on the screw 1, avoiding a wavy line. A standard thread rolling groove 14 is set between the U-shaped thread rolling groove 12 and the prismatic thread rolling groove 13, and the standard teeth 4 further position the screw. The surface undulation of the wavy teeth 3 increases the contact area with the workpiece, thereby increasing the tightening effect.
[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.
Claims
1. A thread rolling dies for anti-loosening self-guiding screws, characterized in that: The thread-rolling plate of the anti-loosening self-guiding screw includes a main thread plate and a secondary thread plate. Both the main and secondary thread plates include opposing working surfaces, multiple U-shaped thread-rolling grooves respectively disposed on the two working surfaces near their length sides, multiple rhomboid thread-rolling grooves disposed on the working surfaces located on one side of the U-shaped thread-rolling grooves, and at least one standard thread-rolling groove with one end connected to the rhomboid thread-rolling groove. The rhomboid thread-rolling groove includes multiple thread-rolling groups and multiple connecting groups disposed between two adjacent thread-rolling groups. Each thread-rolling group includes a first machining surface, two second machining surfaces disposed at both ends of the first machining surface, and a pair of connecting surfaces respectively disposed on both sides of the first machining surface. The third processing surface, and two pairs of fourth processing surfaces respectively disposed on both sides of the two third processing surfaces, the second processing surfaces at both ends are inclined to the same side, and the included angle between them and the first processing surface is an obtuse angle, the included angle being between 130° and 175°. The connecting group includes a first connecting surface and two second connecting surfaces respectively connected to the other two ends of the connecting surface. The two ends of the first connecting surface are respectively connected to the two second processing surfaces, and the two ends of each second connecting surface are respectively connected to the two fourth processing surfaces. A portion of the standard tooth-rolling groove is embedded in a U-shaped tooth-rolling groove adjacent to the rhomboid tooth-rolling groove, and the other end is connected to the rhomboid tooth-rolling groove.
2. The thread rolling plate for anti-loosening self-guiding screws as described in claim 1, characterized in that: The length of the main tooth plate is less than the length of the auxiliary tooth plate.
3. The self-guiding, self-tightening thread forming die of claim 1 wherein: The U-shaped tooth ridge, the rhomboid tooth ridge, and the standard tooth ridge all have the same tilt angle.
4. The self-guiding, self-tightening thread forming die of claim 1 wherein: The working surface protrudes from the opposite end faces of the main tooth plate and the auxiliary tooth plate.
5. The self-guiding, self-tightening thread forming die of claim 1 wherein: One side of the working surface is flush with one end face of the main tooth plate and the auxiliary tooth plate.
6. The self-guiding, self-tightening thread forming die of claim 1 wherein: The width of the working surface is smaller than the width of the main tooth plate and the auxiliary tooth plate, and the length is the same as the length of the main tooth plate and the auxiliary tooth plate.
7. The self-guiding, self-tightening thread forming die of claim 1 wherein: The two sides of the U-shaped tooth-rolling groove are inclined in opposite directions, and multiple U-shaped tooth-rolling grooves are arranged on the side of the working surface away from the main tooth plate and the side of the auxiliary tooth plate.
8. The thread rolling plate for anti-loosening self-guiding screws as described in claim 1, characterized in that: The depth of the U-shaped tooth ridge is at most half the depth of the standard tooth ridge.
9. The self-guiding, self-tightening thread forming die of claim 1 wherein: The depth of the rhomboid tooth groove is greater than the depth of the standard tooth groove.
10. The self-guiding, self-tightening thread forming die of claim 1 wherein: The length of the first processed surface is the same as the length of the third processed surface, and the length of the second processed surface is the same as the length of the fourth processed surface.