Extruded self tapping nut

Abstract

An extruding self-tapping nut, comprising a main body and a flange plate, the main body is integrally connected with the flange plate at the bottom end, and the internal thread hole of the main body is provided with an extruding thread around. The internal thread hole of the extruding self-tapping nut is provided with the extruding thread around, so that the extruding self-tapping nut can effectively avoid material loss, the metal fiber organization of the extruding thread is continuous and not cut off, the strength of the thread is improved, so that the extruding self-tapping nut effectively improves the tapping of the external connecting piece, the extruding thread of the utility model can improve the wear resistance of the thread surface due to the cold work hardening phenomenon caused by extrusion, the extruding self-tapping nut is completely in contact with the surface of the external connecting piece, so that the possibility of vibration loosening can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of self-tapping nut technology, and in particular to a compression self-tapping nut. Background Technology

[0002] Self-tapping nuts are special nuts with sharp teeth that can be directly screwed into the material of the connected parts to form internal threads for fastening without the need for pre-machining of threaded pilot holes. When a self-tapping nut is tightened, its sharp teeth exert a squeezing and cutting effect on the surface of the material being connected. As the nut rotates, internal threads that match the nut are gradually formed in the material, thus achieving a fastening connection with a bolt or screw. For example, a self-tapping nut is disclosed in Chinese Patent Publication No. CN208364568U.

[0003] Currently, the threads of self-tapping nuts are cutting threads. These cutting threads are created by rotating the tap of a tapping machine. These self-tapping nuts with cutting threads will cause material loss, and the metal fiber structure of these cutting threads is cut off, resulting in lower strength.

[0004] Therefore, it is essential to provide a compression self-tapping nut to address the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a compression self-tapping nut. This compression self-tapping nut has the advantages of low material loss and high thread strength.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical measures:

[0007] A self-tapping nut with compression fitting is provided, comprising a body and a flange, wherein the flange is integrally connected to the bottom end of the body, and the internal threaded hole of the body is provided with compression threads.

[0008] Preferably, the lower surface of the flange is provided with a chip collection groove for accommodating chips generated when the self-tapping external connector is used.

[0009] Preferably, the threads in the aforementioned internal threaded hole are divided into a standard thread, a guide thread, a first self-tapping thread, and a second self-tapping thread, and the standard thread, the second self-tapping thread, the first self-tapping thread, and the guide thread are arranged sequentially from top to bottom, with the chip collection groove located at the lower part of the guide thread.

[0010] The height of the standard tooth is defined as H1, the height of the second self-tapping tooth is defined as H2, the height of the first self-tapping tooth is defined as H3, and the height of the guide tooth is defined as H4, where H1 > H2 > H3 > H4.

[0011] Define the minimum value of the minor diameter of the standard internal thread in the standard nut as D 标准1min , define the minor diameter of the standard internal thread in the standard nut as D 标准 , define the outer diameter of the self-tapping external connector to be D, define the minor diameter of the standard thread as d1, define the minor diameter of the second self-tapping thread as d2, define the minor diameter of the first self-tapping thread as d3, define the minor diameter of the guiding thread as d4, and there is D 1max <d4<1.2D, D 1max <d3<D, d2 = d1 = D 标准 .

[0012] Define the height of the standard thread crest in the standard nut as H 标准 , and there is H1 = H 标准 , 0.8H 标准 <H2<H 标准 , 0.6H 标准 <H3<0.8H 标准 , 0.3H 标准 <H4<0.6H 标准 .

[0013] Preferably, the thread crest angle of the above-mentioned standard thread, the thread crest angle of the second self-tapping thread, the thread crest angle of the first self-tapping thread, and the thread crest angle of the guiding thread are all 60°.

[0014] Preferably, the pitch of the above-mentioned standard thread, the pitch of the second self-tapping thread, the pitch of the first self-tapping thread, and the pitch of the guiding thread are all equal to the standard pitch in the standard nut.

[0015] Define the inner chamfer diameter of the chip groove as d a , define the minimum value of the standard inner chamfer diameter in the standard nut as d 标准min , define the maximum value of the standard inner chamfer diameter in the standard nut as d 标准max , and there is 1.2d 标准min <d a <1.2d 标准max .

[0016] Define the inner chamfer height of the chip groove as h, and there is 0.5mm ≤ h ≤ 2mm.

[0017] Preferably, the specifications of the above-mentioned extrusion type self-tapping nut are M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18 or M20;

[0018] Preferably, the specifications of the above-mentioned standard nut are M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18 or M20.

[0019] Preferably, the standard pitch of the standard nut and the standard minor diameter of the internal thread of the standard nut shall comply with GB / T15756:2008.

[0020] Preferably, the standard tooth height of the above standard nut is in accordance with ISO 68-1.

[0021] Preferably, the standard inner chamfer diameter of the above-mentioned standard nut conforms to ISO 4759-1:2000.

[0022] In any longitudinal section of the self-tapping nut, the diameter of the chip collection groove increases from top to bottom; and the upper part of the chip collection groove communicates with the internal threaded hole.

[0023] This utility model discloses a compression-type self-tapping nut, comprising a body and a flange. The flange is integrally connected to the bottom end of the body, and a compression thread is arranged around the internal threaded hole of the body. The compression thread surrounding the internal threaded hole of this compression-type self-tapping nut results in low material loss. Furthermore, the continuous metal fiber structure of the compression thread, without being cut, improves the thread strength, thus effectively enhancing the tapping performance of external connectors. Additionally, the work hardening phenomenon caused by compression further improves the wear resistance of the thread surface. The compression-type self-tapping nut maintains complete contact with the surface of the external connector, thereby reducing the possibility of vibration-induced loosening. Attached Figure Description

[0024] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0025] Figure 1 This is a schematic diagram of a compression self-tapping nut.

[0026] Figure 2 This is a perspective view of a compression self-tapping nut.

[0027] Figure 3 This is a cross-sectional view of a compression self-tapping nut.

[0028] exist Figures 1 to 3 This includes:

[0029] Body 100, internal threaded hole 110, standard thread 120, guide thread 130, first self-tapping thread 140, second self-tapping thread 150.

[0030] Flange 200, chip collection trough 210. Detailed Implementation

[0031] The technical solution of this utility model will be further explained with reference to the following embodiments.

[0032] Example 1: A compression self-tapping nut, such as Figures 1 to 3 As shown, it includes a body 100 and a flange 200. The flange 200 is integrally connected to the bottom end of the body 100. The internal threaded hole 110 of the body 100 is surrounded by a crimped thread. The body 100 is a hexagonal body 100.

[0033] It should be noted that the extruded thread of this utility model is processed using the principle of metal plastic deformation. It can be processed using an extrusion tap, specifically by tapping a traditional flange nut with an extrusion tap. By extruding the material of the traditional flange nut, plastic flow is caused, resulting in an extruded thread surrounding the internal threaded hole 110 of the main body 100. During the extrusion process, the metal fiber structure remains continuous and is not cut, thus increasing the thread's strength. Therefore, the strength of this extruded thread is typically about 30% higher than that of a cut thread. Due to the work hardening phenomenon caused by extrusion, the surface hardness of this extruded thread can be 40%-50% higher than that of the core. Therefore, the extruded self-tapping nut of this utility model has the advantages of high surface wear resistance and high strength. Furthermore, the high surface finish of the extruded thread is beneficial for improving the thread's fitting accuracy and sealing performance, and also facilitates thread assembly. Since the internal thread of the extruded self-tapping nut of this utility model is an extruded thread, it has the advantage of low material loss.

[0034] The lower surface of the flange 200 is provided with a chip collection groove 210 for accommodating chips generated during the use of self-tapping external fasteners. The inner chamfer height of the chip collection groove 210 is defined as h, and there exists a range of 0.5mm ≤ h ≤ 2mm.

[0035] The external connector of this invention can be a connecting pin, which has no threads on its surface.

[0036] The plane where the flange 200 of the self-tapping nut of this invention is located is defined as the bottom, thereby corresponding to the upper and lower directions of the self-tapping nut.

[0037] It should be noted that the chip collection groove 210 of this utility model is used to collect the chips generated when the self-tapping nut of this utility model is tapping the external connector, so as to prevent the chips from having nowhere to be collected or discharged and affecting the connection between the self-tapping nut and the external connector.

[0038] The threads in the internal threaded hole 110 are divided into standard thread 120, guide thread 130, first self-tapping thread 140 and second self-tapping thread 150. The standard thread 120, second self-tapping thread 150, first self-tapping thread 140 and guide thread 130 are arranged sequentially from top to bottom, and the chip collection groove 210 is located at the lower part of the guide thread 130.

[0039] It should be noted that the guiding tooth 130 of the present utility model cooperates with the externally self-tapping connecting part to be self-tapped through a gap to guide and align coaxially, and initially positions the extrusion-type self-tapping nut to avoid thread misalignment. The function of the first self-tapping tooth 140 is to penetrate the surface of the externally self-tapping connecting part to be self-tapped. As the nut rotates, the thread flank continuously squeezes the externally self-tapping connecting part to be self-tapped, forcing the externally self-tapping connecting part to be self-tapped to accumulate towards the tooth valley direction, forming a prototype of the external thread. The function of the second self-tapping tooth 150 is to enhance the extrusion effect through a fine-point tooth profile, raise the height of the external thread tooth crest to be close to the height of the standard tooth 120, compact the side wall of the thread and correct the precision. The function of the standard tooth 120 is to finally squeeze the externally self-tapping connecting part to be self-tapped to form a standard external thread, and the external thread in the area of the standard tooth 120 is completely engaged, achieving high-precision fitting.

[0040] When the extrusion-type self-tapping nut of the present utility model is screwed into the externally self-tapping connecting part to be self-tapped, by using the differential design of the segmented internal thread, an external thread is extruded and formed on the surface of the externally self-tapping connecting part to be self-tapped, realizing meshing and locking. Its core innovation lies in the zoning of the standard tooth 120, the guiding tooth 130, the first self-tapping tooth 140, the second self-tapping tooth 150 and the chip collecting groove 210, successively solving chip collection, guiding and centering, and phased progressive extrusion thread forming.

[0041] Define the tooth crest height value of the standard tooth 120 as H1, the tooth crest height value of the second self-tapping tooth 150 as H2, the tooth crest height value of the first self-tapping tooth 140 as H3, and the tooth crest height value of the guiding tooth 130 as H4, and there is H1>H2>H3>H4.

[0042] Define the minimum value of the minor diameter of the standard internal thread in the standard nut as D 标准1min The minor diameter of the standard internal thread in the standard nut is defined as D 标准 Define the outer diameter of the externally self-tapping connecting part to be self-tapped as D, the minor diameter value of the standard tooth 120 as d1, the minor diameter value of the second self-tapping tooth 150 as d2, the minor diameter value of the first self-tapping tooth 140 as d3, and the minor diameter value of the guiding tooth 130 as d4, and there is D 1max <d4<1.2D, D 1max <d3<D, d2=d1=D 标准 ;

[0043] Define the standard tooth crest height value in the standard nut as H 标准 There is H1=H 标准 0.8H 标准 <H2<H 标准 0.6H 标准 <H3<0.8H 标准 0.3H 标准 <H4<0.6H 标准 .

[0044] The angle of the tooth cavity of the standard tooth 120, the angle of the tooth cavity of the second self-tapping tooth 150, the angle of the tooth cavity of the first self-tapping tooth 140, and the angle of the tooth cavity of the guide tooth 130 are all 60°.

[0045] The pitch of the standard thread 120, the pitch of the second self-tapping thread 150, the pitch of the first self-tapping thread 140, and the pitch of the guide thread 130 are all equal to the standard pitch in the standard nut.

[0046] The inner chamfer diameter of the chip collection groove 210 is defined as d. a The minimum standard inner chamfer diameter in a standard nut is defined as d. 标准min The maximum standard inner chamfer diameter in a standard nut is defined as d. 标准max There is 1.2d 标准min <d a <1.2d 标准max ;

[0047] The standard nuts are M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18, or M20 standard nuts. The standard thread pitch and standard minor diameter of the internal thread of the standard nuts conform to GB / T 15756:2008; the standard chamfer height conforms to ISO 68-1; and the standard internal chamfer diameter conforms to ISO 4759-1:2000. The nominal diameter, standard thread pitch, standard minor diameter of the internal thread, and standard chamfer height of the standard nuts are shown in Table 1, and the standard internal chamfer diameter is shown in Table 2.

[0048] Table 1. Values ​​of nominal diameter, standard pitch, standard minor diameter of internal thread, and standard thread height for different standard nuts, in mm.

[0049]

[0050] Table 2. Values ​​of nominal diameter, standard pitch, standard minor diameter of internal thread, and standard thread height for different standard nuts, in mm.

[0051]

[0052] It should be noted that the specifications of the extrusion self-tapping nut of this utility model are M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18, or M20. When the specification of the extrusion self-tapping nut of this utility model is M3, the corresponding thread minor diameter, thread height, thread angle, thread pitch, and inner chamfer diameter of the standard thread 120, guide thread 130, first self-tapping thread 140, second self-tapping thread 150, and chip groove 210 in the extrusion self-tapping nut all correspond to M3 in the standard nut, as shown in the first row of Table 1 and Table 2.

[0053] For example, when the specification of the extrusion self-tapping nut of this utility model is M3, the standard thread height of M3 in the standard nut is 120mm. 标准 If the value is 0.270633mm, then the height H2 of the second self-tapping thread 150 in the compression self-tapping nut is between 0.270633mm and 0.8mm. 0.270633mm, the height H2 of the first self-tapping thread (140mm) is 0.8. 0.270633mm to 0.6 0.270633mm, the height H4 of the guide tooth 130 is 0.3. 0.270633mm vs 0.6 0.270633mm. The minor diameter of the standard internal thread in the tolerance zone 6H of the M3 standard nut is 2.459mm. Therefore, the minor diameter d1 of the standard thread 120 and the minor diameter d2 of the second self-tapping thread 150 of this invention are both 2.459mm, while the minor diameter d3 of the first self-tapping thread 140 ranges from 2.459mm to D, and the minor diameter d4 of the guide thread 130 ranges from 2.459mm to 1.2D. The pitch of the standard thread 120, the second self-tapping thread 150, the first self-tapping thread 140, and the guide thread 130 are all equal to the standard pitch in the standard nut, all being 0.5mm. The inner chamfer diameter d of the chip groove 210... a It is 1.2 3mm<d a <1.2 3.45mm, and the same applies to other specifications.

[0054] The internal thread hole 110 of the compression self-tapping nut is surrounded by a compression thread, which effectively avoids material loss. Moreover, the metal fiber structure of the compression thread is continuous and not cut, thus improving the strength of the thread. Therefore, it effectively improves the tapping of external connectors by the compression self-tapping nut. Furthermore, the compression thread of this invention exhibits work hardening due to compression, which significantly improves the wear resistance of the thread surface. The compression self-tapping nut is in complete contact with the surface of the external connector, thereby reducing the possibility of vibration and loosening.

[0055] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The above description is merely an example and illustration of the present utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A compression self-tapping nut, comprising a body and a flange, wherein the flange is integrally connected to the bottom end of the body, characterized in that: The main body has an internal threaded hole surrounded by a compression thread.

2. The self-tapping nut with compression fitting according to claim 1, characterized in that: The lower surface of the flange is provided with a chip collection groove for accommodating chips generated when self-tapping external connectors are used.

3. The self-tapping nut with compression fitting according to claim 2, characterized in that: The internal threaded hole has a standard thread, a guide thread, a first self-tapping thread, and a second self-tapping thread. The standard thread, the second self-tapping thread, the first self-tapping thread, and the guide thread are arranged sequentially from top to bottom. The chip collection groove is located at the lower part of the guide thread.

4. The self-tapping nut with compression fitting according to claim 3, characterized in that: The height of the standard tooth is defined as H1, the height of the second self-tapping tooth is defined as H2, the height of the first self-tapping tooth is defined as H3, and the height of the guide tooth is defined as H4, where H1 > H2 > H3 > H4.

5. The self-tapping nut with compression fitting according to claim 4, characterized in that: The minimum minor diameter of the standard internal thread in a standard nut is defined as D. 标准1min The minor diameter of the standard internal thread in a standard nut is defined as D. 标准 Let the outer diameter of the self-tapping external connector be defined as D, the minor diameter of the standard tooth be defined as d1, the minor diameter of the second self-tapping tooth be defined as d2, the minor diameter of the first self-tapping tooth be defined as d3, and the minor diameter of the guide tooth be defined as d4. D exists. 1max <d4<1.2D,D 1max <d3<D, d2=d1=D 标准 ; Define the standard tooth height value of the standard nut as H 标准 , there is H1 = H 标准 , 0.8H 标准 <H2<H 标准 , 0.6H 标准 <H3<0.8H 标准 , 0.3H 标准 <H4<0.6H 标准 .

6. The self-tapping nut with compression fitting according to claim 5, characterized in that: The angle of the tooth chamfer of the standard tooth, the angle of the tooth chamfer of the second self-tapping tooth, the angle of the tooth chamfer of the first self-tapping tooth, and the angle of the tooth chamfer of the guide tooth are all 60°; The pitch of the standard tooth, the pitch of the second self-tapping tooth, the pitch of the first self-tapping tooth, and the pitch of the guide tooth are all equal to the standard pitch in the standard nut.

7. The self-tapping nut with compression fitting according to claim 6, characterized in that: The inner chamfer diameter of the chip collection groove is defined as d. a The minimum standard inner chamfer diameter in a standard nut is defined as d. 标准min The maximum standard inner chamfer diameter in a standard nut is defined as d. 标准max There is 1.2d 标准min <d a <1.2d 标准max ; The inner chamfer height of the chip collection groove is defined as h, and there exists a range of 0.5mm ≤ h ≤ 2mm.

8. The self-tapping nut with compression fitting according to claim 7, characterized in that: The specifications of the extrusion self-tapping nuts are M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18 or M20. The standard nuts are available in sizes M3, M4, M5, M6, M7, M8, M10, M12, M14, M16, M18, or M20.

9. The self-tapping nut with compression fitting according to claim 8, characterized in that: The standard pitch and the standard minor diameter of the internal thread of the standard nut shall comply with GB / T 15756:2008. The standard tooth height of the standard nut shall be in accordance with ISO 68-1; The standard inner chamfer diameter of the standard nut shall conform to ISO 4759-1:2000.

10. The self-tapping nut with compression fitting according to claim 2, characterized in that: In any longitudinal section of the self-tapping nut, the diameter of the chip collection groove increases from top to bottom; and the upper part of the chip collection groove communicates with the internal threaded hole.

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