Nut, screwing assembly and thread rolling plate

Abstract

The utility model discloses a nut, a screw joint assembly and a thread rolling plate, the nut is suitable for self-tapping on a metal plate and is suitable for being matched with a bolt, and the nut comprises a rim, a thread part and an interference fit part; the rim is provided with a through hole for the threaded section of the bolt to pass through; the threaded part is provided with a threaded hole suitable for being in threaded connection with the threaded section, the threaded hole is communicated with the via hole, the interference fit part is provided with a connecting hole, the connecting hole is communicated with the threaded hole, the connecting hole is provided with a reducing hole, and the hole wall of the reducing hole is gradually close to the axis of the threaded hole in the direction away from the wheel flange so as to be suitable for being in interference fit with the threaded section. Due to the fact that the threaded section is in interference fit with the reducing hole, the threaded section can be prevented from loosening, connection of the threaded section and the reducing hole is more stable, and easy loosening caused by vibration and the like is prevented. And compared with a welding mode, more energy is saved. One end of the thread part is connected with the rim, and the outer wall of the thread part is provided with a first self-tapping thread suitable for self-tapping a metal plate, so that the connection strength with the metal plate is improved, and the nut is fixed to the metal plate.

Description

Technical Field

[0001] The utility model relates to the field of fasteners, in particular to a nut, a screw connection component and a thread rolling plate. Background Art

[0002] With the development of the automobile industry and the advancement of technology, the extensive application of new materials and new processes, and the increasing intensity of market competition, new requirements have been put forward for the simplification of automobile fastener processing technology, the lightweighting of parts, and the optimization of costs. The automobile industry is an important field for promoting energy conservation and emission reduction, and materials such as aluminum alloys have low specific gravity, high specific strength, good forming performance, mechanical properties and excellent processability, so they are widely used in automobile parts to replace carbon steel.

[0003] (1) The existing power chassis uses a toothed rivet nut; in the toothed rivet nut solution, the flange direction cannot withstand a large tensile force and is easily loosened.

[0004] (2) In the welding nut solution, discharge and heating methods are required for welding; welding nuts cannot achieve high-strength connection with aluminum plates, and discharge heating is required when welding nuts are used, which consumes a lot of energy and is not conducive to energy saving. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology and provide a nut, a screw connection assembly and a thread rolling plate.

[0006] In order to achieve the above-mentioned purpose, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0007] Solution 1: A nut suitable for self-tapping on sheet metal and suitable for cooperating with a bolt, comprising:

[0008] The wheel rim is provided with a through hole suitable for the threaded section of the bolt to pass through;

[0009] A threaded portion, one end of which is connected to the wheel rim, extends along a first direction and is provided with a threaded hole suitable for being screwed to the threaded section, the threaded hole being connected to the through hole; an outer wall of the threaded portion is provided with a first self-tapping thread suitable for self-tapping the sheet metal; and

[0010] An interference fit portion is connected to an end of the threaded portion away from the rim, extends along a first direction and is provided with a connecting hole, the connecting hole is communicated with the threaded hole, and the connecting hole is provided with a tapered hole, the hole wall of the tapered hole gradually approaches the axis of the threaded hole along the direction away from the rim, so that the size of the tapered hole is smaller than the size of the thread bottom of the threaded hole and is suitable for interference fit with the threaded segment.

[0011] Solution 2: Based on Solution 1, the connecting hole is further provided with a countersunk hole, and the two ends of the countersunk hole are respectively connected to the threaded hole and the tapered hole, and the size of the countersunk hole remains unchanged along the first direction.

[0012] Solution three, based on solution two, the size of the top of the threaded hole is smaller than the size of the countersunk hole, which is smaller than the size of the bottom of the threaded hole.

[0013] Solution 4: Based on Solution 1, the via hole is an operation hole.

[0014] Option 5, based on Option 1 to Option 4, the outer wall of the interference fit portion is also provided with the second self-tapping thread, and the second self-tapping thread is connected to the first self-tapping thread.

[0015] Solution six, based on solution five, the second self-tapping thread corresponding to the tapered hole gradually approaches the axis of the threaded hole in a direction away from the wheel rim.

[0016] Solution seven, a threaded assembly, comprising a bolt and a nut as described in any one of Solution one to Solution six, wherein the bolt is provided with a threaded section, and the threaded section is suitable for being threadedly connected to the threaded hole and having an interference fit with the tapered hole.

[0017] Option 8, a thread rolling plate, which is suitable for forming the outer wall portion of the threaded portion and the interference fit portion in the nut as described in Option 6, the thread rolling plate includes a plate body, a thread rolling portion and the tapered portion; the thread rolling portion and the tapered portion protrude from the same side of the plate body; the thread rolling portion is provided with thread rolling to form the first self-tapping thread, and the tapered portion is used to form the second self-tapping thread; the tapered portion gradually moves away from the plate body, and the distance from the farthest point of the tapered portion from the plate body to the plate body is greater than the distance from the thread rolling portion to the plate body.

[0018] From the above description of the utility model and its preferred embodiments, it can be seen that, compared with the prior art, the technical solution of the utility model and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0019] The applicant has found through continuous penetration, experiments and research that the reason for the technical problem of "" in the existing technical solution is that:

[0020] 1. In scheme 1 and its preferred embodiment, a nut, which is suitable for self-tapping on sheet metal and suitable for cooperating with a bolt, comprises a rim, a threaded portion and an interference fit portion;

[0021] The wheel rim is provided with a through hole for the threaded section of the bolt to pass through; the threaded portion is provided with a threaded hole suitable for threaded connection with the threaded section, the threaded hole is connected to the through hole, the interference fit portion is provided with a connecting hole, the connecting hole is connected to the threaded hole, the connecting hole is provided with a tapered hole, the hole wall of the tapered hole gradually approaches the axis of the threaded hole in a direction away from the wheel rim, so that the size of the tapered hole is smaller than the size of the thread bottom of the threaded hole and is suitable for interference fit with the threaded section.

[0022] One end of the threaded portion is connected to the wheel rim and extends along a first direction. The outer wall of the threaded portion is provided with a first self-tapping thread suitable for self-tapping the sheet metal to increase the connection strength with the sheet metal and fix the nut to the sheet metal.

[0023] When installing:

[0024] Align the first self-tapping thread of the nut with the mounting hole on the sheet metal, and then operate the outer wall of the nut to make the first self-tapping thread cooperate with the mounting hole until the bottom surface of the rim fits against the sheet metal or until the first self-tapping thread can no longer be fed further, and the nut is installed.

[0025] Place the object to be fixed on the sheet metal.

[0026] Operate the bolt so that the threaded section of the bolt passes through the object to be fixed, enters the inside of the nut from the through hole, and is screwed with the threaded hole. As the screwing progresses, the threaded section contacts the gradually shrinking hole and has an interference fit with the gradually shrinking hole, so as to prevent loosening through friction, until the nut of the bolt and the sheet metal jointly clamp the object to be fixed to complete the assembly.

[0027] When the object to be fixed is placed on the nut, the nut of the bolt and the flange of the nut jointly clamp the object to be fixed, and the assembly is completed.

[0028] The interference fit between the threaded section and the tapered hole can prevent the threaded section from loosening, making the connection between the two more stable and preventing them from loosening easily due to vibration. It is also more energy-saving than welding.

[0029] 2. In the second scheme and its preferred embodiment, if the tapered hole is directly connected to the threaded hole, the forming of the tapered hole may cause the threaded hole to deform together, making it difficult for the threaded section to fit with the tail of the threaded hole, thereby causing damage to the threaded section and even making it impossible to fit with the tapered hole. A countersunk hole is also provided through the connecting hole, and the two ends of the countersunk hole are respectively connected to the threaded hole and the tapered hole. The countersunk hole has a constant size along the first direction to achieve transition. When forming the tapered hole, only the countersunk hole will be affected, but not the threaded hole, so it is easy to use.

[0030] 3. In scheme three and its preferred embodiment, the size of the crest of the threaded hole is smaller than the size of the countersunk hole, which is smaller than the size of the bottom of the threaded hole.

[0031] 4. In scheme 4 and its preferred embodiment, the through hole is an operating hole, so that the user can operate the operating hole to fix the nut to the sheet metal, which is convenient for the user to operate.

[0032] 5. In scheme five and its preferred embodiments, if the outer wall of the interference fit part does not have a self-tapping thread, it is necessary to ensure that the outer wall size of the interference fit part is smaller than the size of the mounting hole to facilitate entry into the mounting hole. More conditions need to be considered during installation, and an interference fit part that is too small will also lead to weakened strength. A second self-tapping thread is also provided on the outer wall of the interference fit part. The second self-tapping thread is also suitable for self-tapping the mounting hole, which simplifies the installation conditions and has better strength. At the same time, the second self-tapping thread is connected to the first self-tapping thread, and the threads of the two are continuous, which increases the screw connection area with the mounting hole and increases the connection strength.

[0033] 6. In Scheme 6 and its preferred embodiments, the second self-tapping thread corresponding to the tapered hole gradually approaches the axis of the threaded hole in the direction away from the rim, and the second self-tapping thread corresponding to the tapered hole is used as an introduction section. Since its size is smaller than the first self-tapping thread, it can be more convenient to cooperate with the mounting hole, and the tapered hole can be formed accordingly through the deformation of the second self-tapping thread, and can be processed from the outer wall of the nut, which is simpler and more convenient.

[0034] 7. In scheme seven and its preferred embodiment, a threaded assembly includes a bolt and the above-mentioned nut, wherein the bolt is provided with a threaded section, the threaded section is suitable for being threaded with a threaded hole and having an interference fit with the tapered hole, and has the beneficial effects brought by the above-mentioned nut.

[0035] 8. In the eighth scheme and its preferred embodiment, a thread rolling plate is suitable for forming the outer wall of the threaded part and the interference fit part in the nut, and the thread rolling plate includes a plate body, a thread rolling part and a tapered part; the thread rolling part and the tapered part protrude from the same side of the plate body; the thread rolling part is provided with threads to form a first self-tapping thread, and the tapered part is used to form a second self-tapping thread and a tapered hole; the tapered part gradually moves away from the plate body and the distance from the farthest point of the tapered part to the plate body is greater than the distance from the thread rolling part to the plate body. The outer wall of the nut can be formed by a thread rolling plate, which is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a three-dimensional diagram of the nut in Example 1;

[0038] Figure 2 A half-section view of the nut in Example 1;

[0039] Figure 3 It is a schematic diagram of the assembly of the nut and the sheet metal in the first embodiment;

[0040] Figure 4 It is a schematic diagram of assembling nuts in the first embodiment;

[0041] Figure 5 for Figure 4 Enlarged view of the marked area;

[0042] Figure 6 This is a diagram showing the processing status of the first blank in Example 1.

[0043] Figure 7 It is a three-dimensional diagram of the thread rolling plate in the second embodiment;

[0044] Figure 8 It is a side view of the thread rolling plate in the second embodiment;

[0045] Description of main reference numerals:

[0046] Nut 1; rim 11, through hole 111; threaded portion 12; first self-tapping thread 121; threaded hole 122; interference fit portion 13; second self-tapping thread 131; connecting hole 132; countersunk hole 1321; tapered hole 1322; bolt 2; threaded section 21; sheet metal 3; mounting hole 31; first blank 4; pedestal 41; rod body 42; first light hole 421; second light hole 422; first direction 5; thread rolling plate 6; thread rolling portion 61; tapered portion 62; plate body 63. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0048] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0049] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the invention.

[0050] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0051] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0052] A screw connection assembly comprises a bolt 2 and a nut 1.

[0053] The nut 1 is suitable for self-drilling on the sheet metal 3, and the nut 1 comprises a rim 11, a threaded portion 12 and an interference fit portion 13. The rim 11, the threaded portion 12 and the interference fit portion 13 are coaxially arranged.

[0054] The outer diameter of the rim 11 is larger than the threaded portion 12 and the interference fit portion 13. The rim 11 is hexagonal and serves as a driving head (it can also be a square, octagonal, plum blossom, etc.). The rim 11 is provided with a through hole 111, which is located at the center of the rim 11 and penetrates the rim 11 along the first direction 5. The through hole 111 is used to allow part of the bolt 2 to pass through and reduce the weight of the nut 1; in this embodiment, the through hole 111 is also used as an operating hole for tool driving to connect the nut 1 to the sheet metal 3. The shape of the operating hole can be hexagonal, square, octagonal, plum blossom, etc. Of course, for non-circular rims 11, users can also operate the outer wall of the rim 11 through tools to achieve the connection between the nut 1 and the sheet metal 3. The thickness of the rim 11 is 2-10mm. Of course, other sizes can be designed according to assembly conditions and required connection strength.

[0055] Along the first direction 5, one end of the threaded portion 12 is connected to the rim 11, and the other end is connected to the interference fit portion 13. The threaded portion 12 extends along the first direction 5, and the outer wall of the threaded portion 12 is provided with a first self-tapping thread 121 suitable for self-tapping on the sheet metal 3. Along the extension direction of the threaded portion 12, the outer diameter of the first self-tapping thread 121 is consistent. In this embodiment, the first self-tapping thread 121 is a triangular tooth to facilitate self-tapping. The threaded portion 12 is also provided with a threaded hole 122, which is connected to the through hole 111 and is coaxially arranged. Along the extension direction of the threaded portion 12, the tooth bottom size and tooth top size of the threaded hole 122 remain unchanged.

[0056] The interference fit portion 13 extends along the first direction 5 , is connected to an end of the threaded portion 12 away from the rim 11 , and is provided with a connecting hole 132 , which is coaxial with the through hole 111 and communicates with the threaded hole 122 .

[0057] The connection hole 132 extends along the first direction 5. The connection hole 132 is provided with a countersunk hole 1321 and a tapered hole 1322. The length of the countersunk hole 1321 is 1-5p. The two ends of the countersunk hole 1321 are connected to the threaded hole 122 and the tapered hole 1322 respectively. The size of the countersunk hole 1321 along the first direction 5 is constant. The size D2 of the crest of the threaded hole 122 is smaller than the size D3 of the countersunk hole 1321, which is smaller than the size D1 of the root of the threaded hole 122. The hole wall of the tapered hole 1322 gradually approaches the axis of the threaded hole 122 in the direction away from the wheel rim 11, so that the size of the tapered hole 1322 is smaller than the size of the root of the threaded hole 122. The length of the tapered hole 1322 is about 2p-5p.

[0058] The outer wall of the interference fit portion 13 is provided with a second self-tapping thread 131, and the second self-tapping thread 131 of the interference fit portion 13 is connected to the first self-tapping thread 121 of the threaded portion 12. The second self-tapping thread 131 corresponding to the tapered hole 1322 gradually approaches the axis of the threaded hole 122 in the direction away from the rim 11, that is, the second self-tapping thread 131 corresponding to the tapered hole 1322 is retracted relative to the first self-tapping thread 121. In this embodiment, the diameter of the end of the second self-tapping thread 131 is about 2 / 3 of the diameter of the first self-tapping thread 121. The front end of the second self-tapping thread 131 (the second self-tapping thread 131 corresponding to the countersunk hole 1321) can be consistent with the diameter of the first self-tapping thread 121. The second self-tapping thread 131 corresponding to the tapered hole 1322 is used as an introduction section. Since its size is smaller than that of the first self-tapping thread 121, it can be more convenient to cooperate with the mounting hole 31 on the aluminum plate.

[0059] The bolt 2 is provided with a threaded section 21 , which is suitable for passing through the through hole 111 and then being threadedly connected with the threaded hole 122 , and having an interference fit with the tapered hole 1322 .

[0060] The method of using the screw connection assembly is as follows:

[0061] Align the second self-tapping thread 131 of the nut 1 with the mounting hole 31 on the sheet metal 3, and then operate the outer wall of the nut 1, or operate the through hole 111 of the nut 1 to make the second self-tapping thread 131 and the first self-tapping thread 121 cooperate with the mounting hole 31 until the bottom surface of the rim 11 fits against the sheet metal 3 or until the first self-tapping thread 121 can no longer be fed further, and the nut 1 is installed.

[0062] Place the object to be fixed on the sheet metal 3.

[0063] Operate the bolt 2 so that the threaded section 21 of the bolt 2 passes through the object to be fixed, enters the inside of the nut 1 from the through hole 111, and is screwed with the threaded hole 122. As the screwing progresses, the threaded section 21 abuts against the tapered hole 1322 and has an interference fit with the tapered hole 1322, so as to prevent loosening through friction, until the nut of the bolt 2 and the sheet metal 3 jointly clamp the object to be fixed, and the assembly is completed.

[0064] When the object to be fixed is placed on the nut 1, the nut of the bolt 2 and the flange 11 of the nut 1 clamp the object to be fixed together, and the assembly is completed.

[0065] Embodiment 2:

[0066] A method for processing a nut 1 comprises the following steps:

[0067] Prepare a first blank 4, the first blank 4 includes a rod body 42 and a pedestal 41 protruding outward along the radial direction of the rod body 42; the diameter of the rod body 42 is the same along its extension direction; a through hole 111 is processed on the pedestal 41 to form a rim 11, and a first light hole 421 and a second light hole 422 are processed on the rod body 42, and both ends of the first light hole 421 are connected to the through hole 111 and the second light hole 422 respectively; the diameters of the first light hole 421 and the second light hole 422 are the same along their extension direction;

[0068] Rolling and forming a threaded hole 122 on the first optical hole 421;

[0069] The outer wall of the rod body 42 is threaded by a thread rolling plate to form a self-tapping thread, wherein the front end of the thread rolling plate forms a threaded portion 12 at the front end of the rod body 42, and a first self-tapping thread 121 is formed accordingly. The tail end of the thread rolling plate is designed to squeeze the tail end of the rod body 42, so that the tail end of the rod body 42 shrinks and deforms to form an interference fit portion 13, and a second self-tapping thread 131 is formed accordingly, and the second light hole 422 at least partially shrinks to form a connecting hole 132. Specifically, during the rolling process of the thread rolling plate, due to the transitional extrusion of the tail end of the rod body 42, the second light hole 422 is partially shrunk to form a tapered hole 1322, and the non-shrunk part of the second light hole 422 is formed into a countersunk hole 1321, and the hole wall of the tapered hole 1322 gradually approaches the axis of the threaded hole 122 in the direction away from the rim 11, so that the size of the tapered hole 1322 is smaller than the size of the tooth bottom of the threaded hole 122.

[0070] Of course, in other embodiments, the first blank 4 can be prepared by purchasing.

[0071] refer to Figure 7 , Figure 8 , wherein the thread rolling plate 6 is suitable for forming the outer wall of the threaded portion 12 and the interference fit portion 13 in the nut 1, and the thread rolling plate 6 includes a plate body 63, a thread rolling portion 61 and a tapered portion 62; the thread rolling portion 61 and the tapered portion 62 protrude from the same side of the plate body 63; the thread rolling portion 61 is provided with a thread rolling to form a first self-tapping thread 121, and the tapered portion 62 is used to form a second self-tapping thread 131 and a tapered hole 1322; the tapered portion 62 gradually moves away from the plate body 63 and the distance L1 from the farthest point of the tapered portion 62 to the plate body 63 is greater than the distance L2 from the thread rolling portion 61 to the plate body 63. The outer wall of the nut can be formed by a thread rolling plate 6, which is simple and convenient. wherein the tapered portion 62 is roughly arc-shaped.

[0072] Compared with the prior art, this embodiment has the following beneficial effects:

[0073] In an exemplary embodiment, a nut 1, which is suitable for self-tapping on a sheet metal 3 and for cooperating with a bolt 2, comprises a rim 11, a threaded portion 12 and an interference fit portion 13;

[0074] The rim 11 is provided with a through hole 111 for the threaded section 21 of the bolt 2 to pass through; the threaded portion 12 is provided with a threaded hole 122 suitable for being threadedly connected with the threaded section 21, the threaded hole 122 is connected with the through hole 111, the interference fit portion 13 is provided with a connecting hole 132, the connecting hole 132 is connected with the threaded hole 122, the connecting hole 132 is provided with a tapered hole 1322, the hole wall of the tapered hole 1322 gradually approaches the axis of the threaded hole 122 in a direction away from the rim 11, so that the size of the tapered hole 1322 is smaller than the size of the tooth bottom of the threaded hole 122 and is suitable for interference fit with the threaded section 21.

[0075] One end of the threaded portion 12 is connected to the rim 11 and extends along the first direction 5 . The outer wall of the threaded portion 12 is provided with a first self-tapping thread 121 suitable for self-tapping on the sheet metal 3 to increase the connection strength with the sheet metal 3 and fix the nut 1 to the sheet metal 3 .

[0076] When installing:

[0077] Align the first self-tapping thread 121 of the nut 1 with the mounting hole 31 on the sheet metal 3, and then operate the outer wall of the nut 1 to make the first self-tapping thread 121 cooperate with the mounting hole 31 until the bottom surface of the rim 11 fits against the sheet metal 3 or until the first self-tapping thread 121 can no longer be fed forward, and the nut 1 is installed.

[0078] Place the object to be fixed on the sheet metal 3.

[0079] The bolt 2 is operated so that the threaded section 21 of the bolt 2 penetrates the object to be fixed and enters the inside of the nut 1 from the through hole 111 and is screwed with the threaded hole 122. As the screwing progresses, the threaded section 21 abuts against the tapered hole 1322 and has an interference fit with the tapered hole 1322 to prevent loosening through friction until the nut of the bolt 2 and the sheet metal 3 clamp the object to be fixed together to complete the assembly. When the object to be fixed is placed on the nut 1, the nut of the bolt 2 and the rim 11 of the nut 1 clamp the object to be fixed together to complete the assembly.

[0080] Since the threaded section 21 and the tapered hole 1322 are in interference fit, the threaded section 21 can be prevented from loosening, making the connection between the two more stable and preventing them from being easily loosened due to vibration and the like. It is more energy-saving than welding.

[0081] In an exemplary embodiment, if the tapered hole 1322 is directly connected to the threaded hole 122, the forming of the tapered hole 1322 may cause the threaded hole 122 to deform together, resulting in difficulty in matching the threaded segment 21 with the tail of the threaded hole 122, thereby causing damage to the threaded segment 21, or even causing it to be unable to match with the tapered hole 1322. A countersunk hole 1321 is also provided through the connecting hole 132, and the two ends of the countersunk hole 1321 are respectively connected to the threaded hole 122 and the tapered hole 1322. The countersunk hole 1321 does not change in size along the first direction 5 to achieve transition. When the tapered hole 1322 is formed, only the countersunk hole 1321 will be affected, and the threaded hole 122 will not be affected, so it is easy to use.

[0082] In an exemplary embodiment, the size of the crest of the threaded hole 122 is smaller than the size of the counterbore 1321 , which is smaller than the size of the bottom of the threaded hole 122 .

[0083] In an exemplary embodiment, the through hole 111 is an operating hole, so that the user can operate the operating hole to fix the nut 1 to the sheet metal 3, which is convenient for the user to operate.

[0084] In an exemplary embodiment, if the outer wall of the interference fit portion 13 does not have a self-tapping thread, it is necessary to ensure that the outer wall size of the interference fit portion 13 is smaller than the size of the mounting hole 31 to facilitate entry into the mounting hole 31. More conditions need to be considered during installation, and an interference fit portion 13 that is too small will also lead to weakened strength. A second self-tapping thread 131 is also provided on the outer wall of the interference fit portion 13. The second self-tapping thread 131 is also suitable for self-tapping the mounting hole 31, which simplifies the installation conditions and has better strength. At the same time, the second self-tapping thread 131 is connected to the first self-tapping thread 121, and the threads of the two are continuous, which increases the screw connection area with the mounting hole 31 and increases the connection strength.

[0085] In an exemplary embodiment, the second self-tapping thread 131 corresponding to the tapered hole 1322 gradually approaches the axis of the threaded hole 122 in the direction away from the rim 11, and the second self-tapping thread 131 corresponding to the tapered hole 1322 is used as a guide section. Since its size is smaller than the first self-tapping thread 121, it can be more convenient to match with the mounting hole 31. The tapered hole 1322 can be formed accordingly by the deformation of the second self-tapping thread 131, and can be processed from the outer wall of the nut, which is simpler and more convenient.

[0086] In an exemplary embodiment, a threaded assembly includes a bolt 2 and the above-mentioned nut 1, wherein the bolt 2 is provided with a threaded section 21, and the threaded section 21 is suitable for being threadedly connected with a threaded hole 122 and having an interference fit with a tapered hole 1322, and has the beneficial effects brought by the above-mentioned nut 1.

[0087] In an exemplary embodiment, a method for using a screw connection assembly, based on the screw connection assembly, includes the following method of use:

[0088] The first self-tapping thread 121 is matched with the mounting hole 31 on the sheet metal 3 by operating the nut 1 until the bottom surface of the rim 11 is attached to the sheet metal 3 or until the first self-tapping thread 121 can no longer be fed;

[0089] Place the object to be fixed on the sheet metal 3 or nut 1.

[0090] Operate the bolt 2 so that the threaded section 21 of the bolt 2 passes through the object to be fixed and is screwed into the threaded hole 122, and abuts against the tapered hole 1322 to have an interference fit with the tapered hole 1322; until the nut of the bolt 2 and the sheet metal 3 or the nut 1 clamp the object to be fixed together to complete the assembly, which has the beneficial effects brought by the above-mentioned screw connection assembly.

[0091] In an exemplary embodiment, a method for processing a nut 1 comprises the following steps:

[0092] Prepare a first blank 4, the first blank 4 comprises a rod body 42 and a pedestal 41 protruding outwardly along the radial direction of the rod body 42; the pedestal 41 is provided with a through hole 111; the diameter of the rod body 42 is the same along its extension direction, the rod body 42 is provided with a first light hole 421 and a second light hole 422, and the two ends of the first light hole 421 are respectively connected with the through hole 111 and the second light hole 422; the first light hole 421 is formed with a threaded hole 122; the diameters of the first light hole 421 and the second light hole 422 are the same along their extension direction;

[0093] The outer wall of the rod body 42 is threaded by a thread rolling plate to form a self-tapping thread; wherein, the front end of the thread rolling plate forms a threaded portion 12 at the front end of the rod body 42, and the first self-tapping thread 121 is formed accordingly. The rear end of the thread rolling plate is designed to squeeze the rear end of the rod body 42, so that the rear end of the rod body 42 shrinks and deforms to form an interference fit portion 13, the second self-tapping thread 131 is formed, and the second light hole 422 forms a connecting hole 132. The connecting hole 132 at least partially shrinks to form a tapered hole 1322, and the hole wall of the tapered hole 1322 gradually approaches the axis of the threaded hole 122 in a direction away from the wheel rim 11, so that the size of the tapered hole 1322 is smaller than the size of the root of the thread of the threaded hole 122. Through the integrated thread rolling process, the rear end of the rod body 42 automatically shrinks inward after the thread rolling is completed to form the inward-shrinking second self-tapping thread 131 and the tapered hole 1322, without the need for secondary pressing, and the simple processing process also prevents the second self-tapping thread 131 from being damaged due to secondary pressing. The first self-tapping thread 121 and the second self-tapping thread 131 are processed simultaneously without segmented processing, and the first self-tapping thread 121 or the second self-tapping thread 131 will not be damaged due to interference with the other during processing.

[0094] In an exemplary embodiment, the thread rolling plate 6 is suitable for forming the outer wall of the threaded portion 12 and the interference fit portion 13 in the nut 1, and the thread rolling plate 6 includes a plate body 63, a thread rolling portion 61 and a tapered portion 62; the thread rolling portion 61 and the tapered portion 62 protrude from the same side of the plate body 63; the thread rolling portion 61 is provided with threads to form the first self-tapping thread 121, and the tapered portion 62 is used to form the second self-tapping thread 131 and the tapered hole 1322; the tapered portion 62 gradually moves away from the plate body 63 and the distance from the farthest point of the tapered portion 62 to the plate body 63 is greater than the distance from the thread rolling portion 61 to the plate body 63. The outer wall of the nut can be formed by a thread rolling plate 6, which is simple and convenient.

[0095] The description of the above specification and embodiments is used to explain the protection scope of the utility model, but does not constitute a limitation on the protection scope of the utility model. Through the enlightenment of the utility model or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent replacements or other improvements to the embodiments of the utility model or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the utility model.

Claims

1. A nut, which is suitable for self-tapping on a sheet metal (3) and suitable for cooperating with a bolt (2), characterized in that: include The wheel rim (11) is provided with a through hole (111) suitable for the threaded section (21) of the bolt (2) to pass through; a threaded portion (12), one end of which is connected to the wheel rim (11), extending along the first direction (5) and provided with a threaded hole (122) suitable for being screwed to the threaded section (21), the threaded hole (122) being connected to the through hole (111); an outer wall of the threaded portion (12) is provided with a first self-tapping thread (121) suitable for self-tapping the sheet metal (3); and An interference fit portion (13) is connected to an end of the threaded portion (12) away from the rim (11), extends along a first direction (5) and is provided with a connecting hole (132), the connecting hole (132) is communicated with the threaded hole (122), the connecting hole (132) is provided with a tapered hole (1322), the hole wall of the tapered hole (1322) gradually approaches the axis of the threaded hole (122) along a direction away from the rim (11), so that the size of the tapered hole (1322) is smaller than the size of the root of the threaded hole (122) and is suitable for interference fit with the threaded segment (21).

2. A nut according to claim 1, characterized in that: The connection hole (132) is further provided with a countersunk hole (1321), the two ends of the countersunk hole (1321) are respectively connected to the threaded hole (122) and the tapered hole (1322), and the size of the countersunk hole (1321) along the first direction (5) remains unchanged.

3. A nut according to claim 2, characterized in that: The size of the crest of the threaded hole (122) is smaller than the size of the counterbore (1321) and smaller than the size of the bottom of the threaded hole (122).

4. A nut according to claim 1, characterized in that: The through hole (111) is an operation hole.

5. A nut according to any one of claims 1 to 4, characterized in that: The outer wall of the interference fit portion (13) is also provided with a second self-tapping thread (131), and the second self-tapping thread (131) is connected to the first self-tapping thread (121).

6. A nut according to claim 5, characterized in that: The second self-tapping thread (131) corresponding to the tapered hole (1322) gradually approaches the axis of the threaded hole (122) in a direction away from the wheel rim (11).

7. A screw connection assembly, characterized in that: It comprises a bolt (2) and a nut (1) as claimed in any one of claims 1 to 6, wherein the bolt (2) is provided with a threaded section (21), and the threaded section (21) is suitable for being threadedly connected with the threaded hole (122) and having an interference fit with the tapered hole (1322).

8. A thread rolling plate, characterized in that: It is suitable for forming the outer wall parts of the threaded portion (12) and the interference fit portion (13) in the nut (1) as described in claim 6, and the thread rolling plate (6) includes a plate body (63), a thread rolling portion (61) and a tapered portion (62); the thread rolling portion (61) and the tapered portion (62) protrude from the same side of the plate body (63); the thread rolling portion (61) is provided with thread rolling to form the first self-tapping thread (121), and the tapered portion (62) is used to form the second self-tapping thread (131); the tapered portion (62) gradually moves away from the plate body (63), and the distance from the farthest point of the tapered portion (62) from the plate body (63) to the plate body (63) is greater than the distance from the thread rolling portion (61) to the plate body (63).

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