Thread rolling plate for producing self-tapping and self-locking screws

Abstract

A thread rolling plate for producing self-tapping and self-locking screws comprises a main thread plate and an auxiliary thread plate. Working faces are arranged on the main tooth plate and the auxiliary tooth plate, and each working face is provided with a collecting part and a shaping part. The shaping part is provided with a high thread groove, a low thread groove, an upper square tooth groove and a lower square tooth groove. Thread rolling edges are arranged between the high thread grooves, the upper square tooth groove comprises a first tooth groove and a second tooth groove, and the lower square tooth groove comprises a third tooth groove and a fourth tooth groove. The high thread grooves and the low thread grooves are formed in the working face, two kinds of threads with different heights are formed at a time, and the self-locking performance of the screw is enhanced. The upper square tooth groove and the lower square tooth groove form a first self-locking block, a second self-locking block, a third self-locking block and a fourth self-locking block in the tooth rolling process, and the self-locking performance is improved. The sharp tooth groove and the flower tooth part are arranged on the main tooth plate, so that the cutting and chip removal performance of the screw is improved. The thread rolling plate can be used for machining screws with threads of various functions and specifications under one-time thread rolling, and the machining efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of thread production die plates, in particular to a thread rolling plate for producing self-tapping and self-locking screws. Background Art

[0002] The thread rolling plate is the most common threading tool for processing screws and bolts in the fastener industry for standard parts and non-standard special-shaped parts. Common standard mechanical thread-type thread rolling plates can only produce one type of thread. The thread pattern of the processed screws is relatively simple and has very limited uses. In the automotive field, screws are also faced with the risk of loosening of single-thread fasteners due to long-term vibration of the vehicle body. During the assembly process, it is very easy for the threads to not be fully adapted to the opponent during the initial assembly, resulting in misalignment, which in turn leads to slippage. Secondary processing of screws and bolts with a single thread pattern to improve tightness will undoubtedly increase a lot of manpower and material costs, which is not conducive to the healthy operation of the enterprise. Therefore, it is necessary to develop a thread rolling plate that can produce multiple thread shapes at one time.

[0003] The Chinese patent publication number CN210586922U is called a thread rolling plate, which includes a static thread plate and a dynamic thread plate. The static thread plate and the dynamic thread plate are adjusted by a thread rolling machine to form a gap for the screw blank to pass through. The dynamic thread plate moves relative to the static thread plate. The static thread plate is provided with a guide area toward the front end thread of the dynamic thread plate, and the thread at the outlet end is provided with an outlet area. The dynamic thread plate moves linearly toward the static thread plate and is rolled into a screw with not only a single thread but also a double thread.

[0004] The above-mentioned existing technology utilizes a one-way thread structure to process the fastening device using a thread rolling plate. The production cost of a single screw is high, the self-tapping effect is poor, and the anti-loosening effect in a vibration environment is poor. It does not have a self-locking effect. For the two-way thread structure, another thread rolling plate needs to be used for processing and production, and the processing efficiency is low. Summary of the Invention

[0005] In view of this, the present invention provides a thread rolling plate for producing self-tapping and self-locking screws to solve the above technical problems.

[0006] A thread rolling plate for producing self-tapping and self-locking screws, comprising a main thread plate and a secondary thread plate. A working surface is provided on the opposite end surfaces of the main thread plate and the secondary thread plate. The working surface is an inclined surface on the other side facing away from the long side, and the working surface is provided with a convergence portion and a shaping portion in sequence along the inclined surface toward the other side. The shaping portion is provided with a plurality of high thread grooves at intervals, a plurality of low thread grooves provided between every two adjacent high thread grooves, a plurality of rows of upper square thread grooves staggered on the side of the shaping portion close to the convergence portion, and a plurality of rows of lower square thread grooves staggered on the side of the shaping portion away from the convergence portion. A thread rolling ridge is provided between every two of the high thread grooves, and the low thread grooves are provided on the thread rolling ridge. Each row of the upper square thread grooves includes two first thread grooves intersecting with the high thread grooves, and two second thread grooves intersecting with the low thread grooves. Each row of the lower square tooth grooves includes a third tooth groove on the tooth rolling edge close to the shaping portion away from the convergence portion, and a fourth tooth groove arranged on the tooth rolling edge close to the upper tooth groove.

[0007] Furthermore, in the main tooth plate, a discharge surface is provided on the higher end of the working surface close to the inclined surface.

[0008] Furthermore, the connection point of the discharge surface is inclined toward one side of the main tooth plate, and the inclination angle is 3-5 degrees.

[0009] Furthermore, a portion of the high tooth grooves and low tooth grooves extend obliquely along the lower end of the shaping portion close to the inclined surface toward the convergence portion, and one end portion of the high tooth grooves and low tooth grooves of this portion both extend to the end surface of the convergence portion; another portion of the high tooth grooves and low tooth grooves extend to the higher end of the shaping portion close to the inclined surface.

[0010] Furthermore, the plane width of the rolling edge gradually increases as the high thread groove extends, and the minimum plane width of the rolling edge is the same as the minimum width of the low thread groove.

[0011] Furthermore, the low thread groove always extends along the central axis of the rolling edge.

[0012] Furthermore, the depth of the first tooth groove is less than the depth of the high tooth groove; the second tooth groove is entirely arranged on the tooth rolling edge, and its two ends perpendicular to the length side of the shaping part intersect with the two high tooth grooves respectively.

[0013] Furthermore, a plurality of canine grooves are provided in the high tooth groove located in the upper square tooth groove near the discharge surface and in the upper tooth groove on the main tooth plate.

[0014] Furthermore, a tooth portion is provided on the shaping portion of the main tooth plate.

[0015] Furthermore, the tooth portion is arranged between the upper square groove and the lower square groove and close to the discharge surface. The tooth portion includes a tooth groove and three semicircular teeth arranged in the tooth groove.

[0016] Compared to the prior art, the present invention provides a thread rolling plate for producing self-tapping, self-locking screws. A working surface is provided on each of the primary and secondary thread plates. High thread grooves are provided on the working surfaces, and a low thread groove is provided between each pair of adjacent high thread grooves. This allows the formation of threads of two different heights, one high and one low, in a single thread rolling process. This increases the contact area with the material during tapping, thereby enhancing the self-locking performance of the screw. Upper and lower square thread grooves are spaced apart on the working surface. During thread rolling, first and second self-locking blocks are formed on the high thread, and third and fourth self-locking blocks are formed on the low thread, respectively. This increases the contact area with the material after tapping, further improving the self-locking performance. Sharp tooth grooves and a flower tooth portion are provided on the primary thread plate, forming cutting teeth and chip removal openings during thread rolling, further improving the cutting and chip removal performance of the screw during tapping. This thread rolling plate can produce screws with various thread functions and specifications in a single thread rolling process, eliminating the need for secondary processing and significantly improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a thread rolling plate for producing self-tapping and self-locking screws provided by the present invention.

[0018] Figure 2 for Figure 1 A partial enlarged view of part A of the thread rolling plate for producing self-tapping and self-locking screws.

[0019] Figure 3 for Figure 1 A partial enlarged view of part B of the thread rolling plate for producing self-tapping and self-locking screws.

[0020] Figure 4 For use Figure 1 Schematic diagram of the structure of the screws produced by the thread rolling plate for producing self-tapping and self-locking screws.

[0021] Figure 5 For use Figure 1 A schematic structural diagram of the screws produced by the thread rolling plate for producing self-tapping and self-locking screws from another perspective. DETAILED DESCRIPTION

[0022] The following is a further detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0023] like Figures 1 to 5 , which is a schematic structural diagram of a thread rolling plate for producing self-drilling and self-locking screws provided by the present invention. The thread rolling plate for producing self-drilling and self-locking screws includes a primary thread plate 10 and a secondary thread plate 20. It is conceivable that the thread rolling plate for producing self-drilling and self-locking screws may also include other functional structures, such as a fixing structure, a horizontal drive mechanism, a mounting structure, etc. These are well known to those skilled in the art and will not be described in detail here.

[0024] The screws threaded by the main thread plate 10 and the auxiliary thread plate 20 are composed of a screw 1, high thread 2, low thread 3, a first self-locking block 4, a broken tooth part 5, a second self-locking block 6, a third self-locking block 7, a fourth self-locking block 8, cutting teeth 9, and a chip removal part 101.

[0025] A working surface 11 is provided on the opposing end surfaces of the primary and secondary platons 10 and 20. The two ends of the working surface 11 are flush with the ends of the primary and secondary platons 10 and 20, respectively. One side of the working surface 11 is flush with the same side of the primary and secondary platons 10 and 20, respectively. The other side of the working surface 11, facing away from the long side, is an inclined surface 12, which facilitates the operator's identification and placement of the primary and secondary platons 10 and 20.

[0026] In this embodiment, the inclined surface 12 is based on the side of the working surface 11 away from the inclined surface 12.

[0027] The working surface 11 is provided with a convergence portion 13 and a shaping portion 14 in sequence along the inclined surface 12 toward the other side.

[0028] In the primary thread plate 10, a discharge surface 15 is provided on the higher end of the working surface 11 near the inclined surface 12. One end of the discharge surface 15 is connected to the constricting portion 13 and the shaping portion 14. The connection portion of the discharge surface 15 is inclined toward one side of the primary thread plate 10 at an angle of 3-5 degrees to facilitate the removal of the formed screw from between the primary thread plate 10 and the auxiliary thread plate 20.

[0029] The convergence portion 13 is inclined along the connection with the shaping portion 14 toward a side away from the primary thread plate 10 and the secondary thread plate 20 , and the end of the screw 1 is converged into a pointed cone shape during thread rolling, thereby improving the self-tapping performance of the screw.

[0030] The shaping portion 14 is provided with a plurality of high grooves 16 at intervals, a plurality of low grooves 17 disposed between every two adjacent high grooves 16, a plurality of rows of upper square grooves 18 staggeredly disposed on the shaping portion 14 on the side close to the convergent portion 13, and a plurality of rows of lower square grooves 19 staggeredly disposed on the shaping portion 14 on the side away from the convergent portion 13. One end of the plurality of high grooves 16 and the low grooves 17 are all disposed on the shaping portion 14 at an angle toward the convergent portion 13, and have the same inclination angle.

[0031] See also Figure 1 A portion of the high thread grooves 16 and low thread grooves 17 extend obliquely along the lower end of the shaping portion 14 near the inclined surface 12 toward the convergent portion 13, and one end of the high thread grooves 16 and low thread grooves 17 in this portion both extend to the end surface of the convergent portion 13. During thread rolling, high thread 2 and low thread 3 can also be formed on the conical surface of the thread, thereby improving the self-tapping and thread guiding performance of the screw. Another portion of the high thread grooves 16 and low thread grooves 17 extend to the higher end of the shaping portion 14 near the inclined surface 12, ensuring the integrity of the thread during thread rolling.

[0032] The high thread groove 16 is a tapered groove, and its opening gradually narrows from its starting end to the other end, thereby gradually converging to form a high thread 2 on the surface of the screw 1.

[0033] Please continue reading Figure 1 A rolling ridge 21 is provided between each two of the high thread grooves 16. The end surface of the rolling ridge 21 facing away from the primary thread plate 10 and the auxiliary thread plate 20 is a plane, and the low thread groove 17 is provided on the rolling ridge 21. A plurality of rows of anti-slip grooves 22 are provided on each rolling ridge 21 along the lower end of the inclined surface 12 to the middle area of ​​the shaping portion 14, which can prevent the surface of the screw 1 from being smooth and tilted during thread rolling, thereby reducing the defective product rate. The plane width of the rolling ridge 21 gradually increases as the high thread grooves 16 extend, and the minimum width of the plane of the rolling ridge 21 is the same as the minimum width of the low thread groove 17, ensuring that the overall depth of the low thread groove 17 is the same. The low thread groove 17 always extends along the central axis of the rolling ridge 21, thereby forming an additional low thread 3 between the pitches of the high thread 2, which, in combination with the high thread 2, can improve the fastening effect after tapping into the workpiece.

[0034] The upper square tooth groove 18 and the lower square tooth groove 19 are both grooves arranged on the tooth rolling edge 21 and have the same structure. The upper square tooth groove 18 and the lower square tooth groove 19 are arranged parallel to the width side of the shaping part 14.

[0035] Each row of the upper square tooth grooves 18 includes two first tooth grooves 181 intersecting the high tooth grooves 16 , and two second tooth grooves 182 intersecting the low tooth grooves 17 .

[0036] See also Figure 2 The first tooth groove 181 is always divided equidistantly by the high thread groove 16. That is, the first tooth groove 181 is distributed on both sides of the high thread groove 16 and has equal area. Therefore, during thread rolling, a first self-locking block 4 with the same volume on both sides can be formed at the high thread 2. The two ends of the first tooth groove 181 also intersect with the low thread groove 17 on both sides, separating the low thread groove 17, forming a broken tooth band 5 on the screw 1. This prevents the first self-locking block 4 from interlacing with the low thread 3 and affecting the self-locking effect. At the same time, waste chips can be discharged from the broken tooth band 5, thereby improving the chip removal performance of the screw during the process of driving into the workpiece.

[0037] The depth of the first tooth groove 181 is less than the depth of the high thread groove 16, so that the tooth tip of the high screw thread 2 protrudes from the surface of the first self-locking block 4, so that the high screw thread 2 has a self-locking function during tapping.

[0038] Please continue reading Figure 2 The second groove 182 is integrally formed on the thread rolling ridge 21, with its ends perpendicular to the length of the shaping portion 14 intersecting with two of the high thread grooves 16. The second groove 18 separates the low thread groove 17. Since the low thread groove 17 extends along the central axis of the thread rolling ridge 21, the second groove 18 forms an evenly divided second self-locking block 6 during thread rolling. The depth of the second groove 18 is less than that of the low thread groove 17, allowing the tips of the low thread 3 to protrude from the surface of the second self-locking block 6, maintaining the cutting performance of the low thread 3 when tapping into a workpiece.

[0039] Each row of the lower square tooth grooves 19 includes a third tooth groove 191 on the rolling edge 21 close to the shaping portion 14 away from the convergence portion 13, and a fourth tooth groove 192 arranged on the rolling edge 21 close to the upper tooth groove 18.

[0040] The third tooth groove 191 is divided equally by the high tooth groove 16, that is, the two parts of the third tooth groove 191 are respectively arranged on two adjacent rolling edges 21, and the low tooth groove 17 is separated by one end close to the side of the shaping part 14, forming a third self-locking block 7 on the screw 1, and forming a broken tooth surface 5 between the low thread 3, thereby improving the chip removal performance of the screw.

[0041] The fourth groove 192 is entirely disposed on one of the thread rolling edges 21, such that the fourth groove 192 is equally divided by the low thread groove 17. The depth of the fourth groove 192 is less than that of the low thread groove 17. When the fourth self-locking block 8 is formed on the low thread 3, the tip of the low thread 3 protrudes from the surface of the fourth self-locking block 8, thereby maintaining the cutting performance of the low thread 3.

[0042] The first self-locking block 4, the second self-locking block 6, the third self-locking block 7, and the fourth self-locking block 8 are all used to increase the contact area with the workpiece after being driven into the workpiece, thereby improving the self-locking performance of the screw.

[0043] Please continue reading Figure 2 On the main thread plate 10, a plurality of sharp tooth grooves 23 are further provided in the high thread groove 16 located in the upper square tooth groove 18 near the discharge surface 15. The plurality of sharp tooth grooves 23 are connected end to end to form cutting teeth 9 at the tooth tips of the high thread 2 after the high thread 2 is formed, thereby having stronger scraping performance when driving into the material, thereby improving the smoothness of the screw when driving into the material.

[0044] Please continue reading Figure 1 A tooth portion 24 is further provided on the shaping portion 14 of the main tooth plate 10. The tooth portion 24 is provided between the upper square groove 18 and the lower square groove 19 and is close to the discharge surface 15. The tooth portion 24 includes a tooth groove 241 and three semicircular teeth 242 provided in the tooth groove 241.

[0045] The tooth groove 241 is a prismatic groove that separates a plurality of adjacent high-thread grooves 16 and low-thread grooves 17. The semicircular tooth 242 is an arcuate tooth surface disposed within the tooth groove 241. The semicircular tooth 242 is tilted within the tooth groove 241, with an angle smaller than that of the high-thread grooves 16 and low-thread grooves 17. The angle between the semicircular tooth 242 and the longitudinal sides of the shaping portion 14 is 5-20 degrees. The tooth portion 24 forms multiple chip removal openings 101 on the tips of the high-thread 2 and low-thread 3 threads during thread rolling. These multiple chip removal openings 101 are connected to the broken tooth portion 5 at both ends of the screw 1, further improving chip removal performance and thus increasing the smoothness of the screw when driving into the material.

[0046] It can be imagined that the flower tooth portion 24 is only provided on the shaping portion 14 of the main tooth plate 10 in order to avoid excessive deformation of the formed screw thread after contact with the flower tooth portion 24, and therefore the high thread groove 16 and the low thread groove 17 on the auxiliary tooth plate 20 are required to assist in shaping.

[0047] During use, the primary thread plate 10 is fixed. The secondary thread plate 20 is fixed to the drive device so that the two working surfaces 11 face each other. A screw blank is placed close to the working surface 11 of the primary thread plate 10, and the secondary thread plate 20 is driven to move toward the primary thread plate 10 so that the two working surfaces 11 gradually intersect, overlap, and separate, thereby processing the screw blank into a finished screw.

[0048] Compared with the prior art, the present invention provides a thread rolling plate for producing self-tapping and self-locking screws by respectively providing a shaping portion 14 on the main thread plate 10 and the auxiliary thread plate 20. The high thread groove 16 is provided on the shaping portion 14, and a low thread groove 17 is provided between every two adjacent high thread grooves 16, so that two different heights of threads, one high and one low, can be formed in one thread rolling process, thereby increasing the contact area with the material when tapping into the material, thereby enhancing the self-locking performance of the screw. The upper square thread groove 18 and the lower square thread groove 19 are provided at intervals on the shaping portion 14, and when tapping, the first self-locking block 4 and the second self-locking block 6 are formed on the high thread 2, and the third self-locking block 8 and the fourth self-locking block 9 are formed on the low thread 3, thereby increasing the contact area with the material after tapping into the material, and further improving the self-locking performance. The cusp grooves 23 and the toothed portion 24 are provided on the main thread plate 10, forming cutting teeth 9 and chip removal openings 101 during thread rolling, further improving the cutting and chip removal performance of the screw when driving into the material. The thread rolling plate can process screws with various functions and thread specifications in a single thread rolling operation, eliminating the need for secondary processing, greatly improving processing efficiency.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements or improvements within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. A thread rolling plate for producing self-tapping and self-locking screws, characterized by: The thread rolling plate for producing self-tapping and self-locking screws includes a main thread plate and a secondary thread plate. A working surface is provided on the opposite end surfaces of the main thread plate and the secondary thread plate. The other side of the working surface facing away from the long side is an inclined surface. The working surface is provided with a convergence portion and a shaping portion in sequence along the inclined surface to the other side. The shaping portion is provided with a plurality of high thread grooves at intervals, a plurality of low thread grooves arranged between every two adjacent high thread grooves, a plurality of rows of upper square thread grooves staggeredly arranged on the side of the shaping portion close to the convergence portion, and a plurality of rows of The lower square tooth grooves are staggered on the side of the shaping part away from the convergence part, a rolling ridge is set between every two of the high tooth grooves, and the low tooth grooves are set on the rolling ridges. Each row of the upper square tooth grooves includes two first tooth grooves arranged to cross the high tooth grooves, and two second tooth grooves arranged to cross the low tooth grooves. Each row of the lower square tooth grooves includes a third tooth groove on the rolling ridge close to the shaping part away from the convergence part, and a fourth tooth groove arranged on the rolling ridge close to the upper tooth groove.

2. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: In the main tooth plate, a discharge surface is provided on the higher end of the working surface close to the inclined surface.

3. The thread rolling plate for producing self-tapping and self-locking screws according to claim 2, characterized in that: The connection point of the discharge surface is inclined toward one side of the main tooth plate, and the inclination angle is 3-5 degrees.

4. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: A portion of the high tooth grooves and low tooth grooves extend obliquely along the lower end of the shaping portion close to the inclined surface toward the convergence portion, and one end of the high tooth grooves and low tooth grooves of this portion extends to the end surface of the convergence portion; another portion of the high tooth grooves and low tooth grooves extend to the higher end of the shaping portion close to the inclined surface.

5. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: The plane width of the rolling edge gradually increases as the high thread groove extends, and the minimum plane width of the rolling edge is the same as the minimum width of the low thread groove.

6. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: The low thread groove always extends along the central axis of the rolling edge.

7. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: The depth of the first tooth groove is less than the depth of the high tooth groove; the second tooth groove is entirely arranged on the tooth rolling edge, and its two ends perpendicular to the length side of the shaping part intersect with the two high tooth grooves respectively.

8. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: On the main tooth plate, a plurality of sharp tooth grooves are further provided in the high tooth groove located in the upper square tooth groove close to the discharge surface and in the upper tooth groove.

9. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: A tooth portion is also provided on the shaping portion on the main tooth plate.

10. The thread rolling plate for producing self-tapping and self-locking screws according to claim 1, characterized in that: The tooth portion is arranged between the upper square groove and the lower square groove and close to the discharge surface. The tooth portion includes a tooth groove and three semicircular teeth arranged in the tooth groove.

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