Punch riveting nut

Abstract

The utility model discloses a kind of stamping riveting nuts, including anti-drop section, is rotary body, the radial dimension of anti-drop section outer wall itself gradually changes along axial direction;Anti-rotation section, the radial dimension of outer wall itself changes along circumference direction;Cylindrical section, outer wall itself is circumferential surface;Among them, anti-drop section, anti-rotation section, cylindrical section are arranged along axial direction integrally coaxially, the shaft end of anti-drop section has blind hole;Along the axis direction away from anti-rotation section, the radial dimension of anti-drop section outer wall gradually increases;The radial dimension of anti-rotation section outer wall is greater than the radial dimension of anti-drop section outer wall, cylindrical section outer wall. Using the utility model makes that stamping riveting nut realizes anti-drop, anti-rotation function by unique structure design, compact structure and strong integrity.

Description

Technical Field

[0001] This utility model relates to the field of inserts, specifically to a stamped riveting nut. Background Technology

[0002] In the field of inserts, the current riveting and fixing structure for nuts relies on the use of perforated teeth. During the riveting process, the perforated teeth interfere with the bottom hole of the sheet metal, squeezing the material into the flared area to achieve assembly. The perforated teeth of the riveted nut provide torque, while the flared end, combined with the perforated teeth, provides the ejection force. The disadvantages of this approach are: firstly, this structure design is relatively limited for the torque requirements of current applications; secondly, the product manufacturing process is relatively complex, requiring cold heading, machining, heat treatment, electroplating, etc., resulting in higher product costs. Utility Model Content

[0003] The problem to be solved by this utility model is to provide a stamped riveting nut.

[0004] To solve the above problems, this utility model provides a stamped riveting nut. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows: A stamped riveting nut includes: an anti-detachment section, which is a rotating body, and the radial dimension of its outer wall gradually changes along the axial direction; an anti-rotation section, the radial dimension of its outer wall varies along the circumferential direction; and a cylindrical section, the outer wall of which is a circumferential surface. The anti-detachment section, the anti-rotation section, and the cylindrical section are integrally and coaxially arranged along the axial direction, and the shaft end of the anti-detachment section has a blind hole. Along the axial direction away from the anti-rotation section, the radial dimension of the outer wall of the anti-detachment section gradually increases; the radial dimension of the outer wall of the anti-rotation section is greater than the radial dimensions of the outer walls of the anti-detachment section and the cylindrical section.

[0005] As a further improvement of this utility model, a stamping structure integrating the anti-detachment section, anti-rotation section, cylindrical section, and blind hole is provided, with the blind hole occupying the interior of the anti-detachment section, anti-rotation section, and cylindrical section.

[0006] As a further improvement of this utility model, the inner wall of the blind hole has a circular cross-sectional profile, the outer wall of the anti-detachment section and the outer wall of the cylindrical section have a circular cross-sectional profile, and the outer wall of the anti-rotation section has a regular polygon with an outer rounded corner at the apex.

[0007] As a further improvement of this utility model, along the depth direction of the blind hole, the blind hole is composed of a frustum cavity and a cylindrical cavity in sequence; the frustum cavity occupies the interior of the anti-detachment section, and the diameter of the frustum cavity gradually decreases along the depth of the blind hole; the cylindrical cavity occupies the interior of the anti-rotation section and the cylindrical section; the junction of the frustum cavity and the cylindrical cavity is transitioned by a second outer fillet.

[0008] As a further improvement of this utility model, among the radial dimensions of the outer walls at both ends of the anti-detachment section, the radial dimension of the outer wall at the relatively larger end of the anti-detachment section is greater than the diameter of the outer wall of the cylindrical section, and the radial dimension of the outer wall at the relatively smaller end of the anti-detachment section is less than the diameter of the outer wall of the cylindrical section.

[0009] As a further improvement of this utility model, the axial lengths of the cylindrical section, the anti-detachment section, and the anti-rotation section gradually shorten, and the radial thicknesses of the anti-rotation section, the cylindrical section, and the anti-detachment section gradually thin.

[0010] As a further improvement of this utility model, the bottom edge of the blind hole has a third inner rounded corner, the junction of the outer walls of the anti-detachment section and the anti-rotation section has a first inner rounded corner, the junction of the outer walls of the anti-rotation section and the cylindrical section has a second inner rounded corner, and the outer wall of the end of the cylindrical section away from the anti-rotation section has a first outer rounded corner.

[0011] As a further improvement of this utility model, the cross-sectional profile of the outer wall of the anti-rotation section is a regular hexagon or regular pentagon with an outer rounded corner at the apex.

[0012] As a further improvement of this utility model, the stamped riveting nut is made of 1215 color zinc plating with a zinc plating thickness of 5µm to 12µm.

[0013] As a further improvement of this utility model, a composite injection molded insert includes the above-mentioned stamped riveting nut. The composite injection molded insert includes an injection molded part that circumferentially wraps around the stamped riveting nut. The injection molded part has a stepped hole through which the stamped riveting nut passes. The stepped hole includes a cylindrical hole and a prismatic hole. An anti-detachment section and an anti-rotation section are located in the cylindrical hole and the prismatic hole, respectively.

[0014] The beneficial effects of the stamped riveting nut of this application are: Firstly, the unique structural design of the stamped riveting nut provides excellent fundamental performance for its connection applications. The radial dimension of the outer wall of the anti-loosening section gradually changes along the axial direction and increases further away from the anti-rotation section. This allows for a tight engagement with the connected materials during riveting, greatly enhancing pull-out resistance and effectively preventing the nut from falling off the connection. The radial dimension of the outer wall of the anti-rotation section changes circumferentially, allowing for a tight fit with the mating parts and preventing the nut from rotating under torque, ensuring connection stability. Furthermore, the integrated coaxial arrangement of the anti-loosening section, anti-rotation section, and cylindrical section, along with the blind hole at the shaft end of the anti-loosening section, ensures structural compactness and integrity, optimizes mechanical properties, and enhances the nut's strength and durability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of one embodiment of the stamped riveting nut of this utility model; Figure 2 This is a cross-sectional view (AA) of one embodiment of the stamped riveting nut of this utility model; Figure 3 This is a top view of one embodiment of the stamped riveting nut of this utility model; Figure 4 This is a perspective view of one embodiment of the stamped riveting nut of this utility model; Figure 5 This is a schematic diagram of one embodiment of the present invention applied to composite injection molded inserts.

[0017] 1-Anti-detachment section; 2-Anti-rotation section; 3-Cylindrical section; 4-Blind hole; 401-Frustum cavity; 402-Cylindrical cavity; 5-Acute internal angle; 6-First inner fillet; 7-Second inner fillet; 8-First outer fillet; 9-Second outer fillet; 10-Third inner fillet; 11-Horizontal straight surface; 12-Third outer fillet; 13-Injection molded part; 14-Stepped hole; 1401-Cylindrical hole; 1402-Prismatic hole. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments: In order to achieve the purpose of this utility model, such as Figures 1 to 4 As shown, a stamped riveting nut includes: an anti-detachment section 1, which is a rotating body, and the radial dimension of the outer wall of the anti-detachment section 1 gradually changes along the axial direction; an anti-rotation section 2, the radial dimension of the outer wall of the anti-detachment section 2 varies along the circumferential direction; and a cylindrical section 3, the outer wall of which is a circumferential surface. The anti-detachment section 1, the anti-rotation section 2, and the cylindrical section 3 are arranged coaxially along the axial direction, and the shaft end of the anti-detachment section 1 has a blind hole 4. Along the axial direction away from the anti-rotation section 2, the radial dimension of the outer wall of the anti-detachment section 2 gradually increases. The radial dimension of the outer wall of the anti-rotation section 2 is greater than the radial dimensions of the outer walls of the anti-detachment section 1 and the cylindrical section 3.

[0019] The beneficial effects of adopting the above technical solution are as follows: the radial dimension of the outer wall of the anti-detachment section 1 gradually changes along the axial direction and gradually increases away from the axis of the anti-rotation section 2, which can better embed the material during riveting and increase the pull-out resistance. The radial dimension of the outer wall of the anti-rotation section 2 changes circumferentially, which can effectively prevent the nut from rotating when in contact with the mating parts. The anti-detachment section 1, the anti-rotation section 2, and the cylindrical section 3 are arranged coaxially as a whole, and the shaft end of the anti-detachment section 1 has a blind hole 4, which ensures the compactness and integrity of the structure, optimizes the mechanical properties, and achieves good anti-detachment and anti-rotation functions as a whole.

[0020] In some other embodiments of this utility model, the anti-detachment section 1, the anti-rotation section 2, the cylindrical section 3, and the blind hole 4 are integrated into a stamping structure, with the blind hole 4 occupying the interior of the anti-detachment section 1, the anti-rotation section 2, and the cylindrical section 3.

[0021] The beneficial effects of adopting the above technical solution are: the anti-detachment section 1, the anti-rotation section 2, the cylindrical section 3, and the blind hole 4 are integrated stamping structures, with the blind hole 4 occupying the interior. Compared with multi-process combination manufacturing, it simplifies the production process, reduces the accumulation of errors between processes, improves production efficiency, reduces production costs, and enhances the overall structural strength and stability.

[0022] In one embodiment, the two ends of the anti-detachment section 1 are the maximum shaft end and the minimum shaft end, respectively. The maximum shaft end of the anti-detachment section 1 is ∅A0 / -0.08, that is, the upper deviation is 0 and the lower deviation is 0.08. The minimum shaft end of the anti-detachment section 1 is ∅B±0.1, that is, it is allowed to fluctuate up and down by 0.1.

[0023] In one embodiment, the junction of the outer walls of the anti-detachment section 1 and the anti-rotation section 2 forms an acute concave angle 5. The degree of the concave angle is 70°.

[0024] In one embodiment, the inner diameter of the maximum shaft end of the anti-detachment section 1 is ∅8.37, that is, a diameter of 8.37 mm.

[0025] In some other embodiments of this utility model, the inner wall of the blind hole 4 has a circular cross-sectional profile, the outer wall of the anti-detachment section 1 and the outer wall of the cylindrical section 3 have a circular cross-sectional profile, and the outer wall of the anti-rotation section 2 has a regular polygon with an outer rounded corner at the top.

[0026] The beneficial effects of adopting the above technical solution are: the cross-sectional outline of the inner wall of the blind hole 4, the outer wall of the anti-detachment section 1, and the outer wall of the cylindrical section 3 is circular, which facilitates processing and assembly and ensures coaxiality; the cross-sectional outline of the outer wall of the anti-rotation section 2 is a regular polygon with an outer rounded corner at the top. The outer rounded corner reduces stress concentration, and the regular polygonal structure provides greater torque during mating to prevent the nut from rotating.

[0027] In some other embodiments of this utility model, along the depth direction of the blind hole 4, the blind hole 4 is composed of a frustum cavity 401 and a cylindrical cavity 402 in sequence; the frustum cavity 401 occupies the interior of the anti-detachment section 1, the diameter of the frustum cavity 402 gradually decreases along the depth of the blind hole 4, the cylindrical cavity 402 occupies the interior of the anti-rotation section 2 and the cylindrical section 3, and the junction of the frustum cavity 401 and the cylindrical cavity 402 is transitioned by a second outer fillet 9.

[0028] The beneficial effects of adopting the above technical solution are as follows: the blind hole 4 is composed of a frustum cavity 401 and a cylindrical cavity 402. The diameter of the frustum cavity 401 gradually decreases along the depth, which is conducive to the filling and flow of material during riveting and enhances the riveting firmness. The frustum cavity 401 and the cylindrical cavity 402 are transitioned by the second outer fillet 9, which avoids stress concentration and improves the internal structural strength and stability of the blind hole 4.

[0029] In some other embodiments of this utility model, among the radial dimensions of the outer walls at both ends of the anti-detachment section 1, the radial dimension of the outer wall at the relatively larger end of the anti-detachment section 1 is greater than the diameter of the outer wall of the cylindrical section 3, and the radial dimension of the outer wall at the relatively smaller end of the anti-detachment section 1 is less than the diameter of the outer wall of the cylindrical section 3.

[0030] The beneficial effects of adopting the above technical solution are: the radial dimension of the outer wall of the relatively large end of the anti-detachment section 1 is greater than the outer wall diameter of the cylindrical section 3, which can hold the material in place during riveting to prevent it from falling off; the relatively small end is smaller than the outer wall diameter of the cylindrical section 3, which makes the structural transition natural, facilitates installation, and enhances the overall anti-detachment effect.

[0031] In some other embodiments of this utility model, the axial lengths of the cylindrical section 3, the anti-detachment section 1, and the anti-rotation section 2 gradually decrease, and the radial thicknesses of the anti-rotation section 2, the cylindrical section 3, and the anti-detachment section 1 gradually decrease.

[0032] The beneficial effects of adopting the above technical solution are: the cylindrical section 3, the anti-detachment section 1, and the anti-rotation section 2 have gradually shorter axial lengths and gradually thinner radial thicknesses, which optimizes the material distribution, reduces the weight of the nut while ensuring functionality, and this gradual structure is more in line with the requirements of the stamping process.

[0033] In some other embodiments of this utility model, the bottom edge of the blind hole 4 has a third inner rounded corner 10, the junction of the outer walls of the anti-detachment section 1 and the anti-rotation section 2 has a first inner rounded corner 6, the junction of the outer walls of the anti-rotation section 2 and the cylindrical section 3 has a second inner rounded corner 7, and the outer wall of the end of the cylindrical section 3 away from the anti-rotation section 2 has a first outer rounded corner 8.

[0034] The beneficial effects of adopting the above technical solution are: the third inner rounded corner 10 at the bottom of the blind hole 4, the first inner rounded corner 6 at the junction of the outer walls of the anti-detachment section 1 and the anti-rotation section 2, the second inner rounded corner 7 at the junction of the outer walls of the anti-rotation section 2 and the cylindrical section 3, and the first outer rounded corner 8 at one end of the cylindrical section 3 eliminate sharp edges and corners, reduce stress concentration, and improve the fatigue resistance and service life of the nut.

[0035] In some other embodiments of this utility model, the cross-sectional profile of the outer wall of the anti-rotation section 2 is a regular hexagon or a regular pentagon with an outer rounded corner at the apex.

[0036] like Figure 4 As shown, the outer wall of the anti-rotation section 2 is composed of alternating horizontal straight surfaces 11 and third outer rounded corners 12. Each end of the horizontal straight surface 11 is tangentially transitioned to a third outer rounded corner 12. The horizontal straight surface 11 is perpendicular to the axis of the stamped riveting nut.

[0037] like Figure 3 As shown, 6-R2±0.2 means that there are 6 circular or arc features with a radius of 2mm on the part (i.e., the third outer fillet 12), and the actual radius of each feature must be controlled within the range of 1.8mm to 2.2mm. 3-C±0.1 means that there are three pairs of mutually parallel surfaces (i.e., two mutually parallel horizontal straight surfaces 11), and their vertical distance is allowed to deviate by 0.1mm each.

[0038] The beneficial effects of adopting the above technical solution are: the cross-section of the outer wall of the anti-rotation section 2 is a regular hexagon or regular pentagon with rounded corners at the top, which can provide greater torque compared with other shapes and meet the needs of different application scenarios; the rounded corners improve the structural strength and prevent damage caused by stress concentration.

[0039] In some other embodiments of this utility model, the stamped riveting nut is made of 1215 color zinc plating with a zinc plating thickness of 5µm to 12µm.

[0040] The beneficial effects of adopting the above technical solution are: the stamped riveting nut is made of 1215 color zinc plated material. 1215 steel is suitable for stamping processing. The color zinc plated layer is 5μm to 12μm thick and is passivated, which enhances the corrosion resistance of the nut, meets environmental protection standards, and can be used stably in a variety of environments.

[0041] This utility model of stamped riveting nut can be used in applications involving riveting with sheet metal.

[0042] like Figure 5 As shown, a composite injection molded insert includes the aforementioned stamped riveting nut. The composite injection molded insert includes an injection molded part 13 that circumferentially wraps around the stamped riveting nut. The injection molded part 13 has a stepped hole 14 through which the stamped riveting nut passes. The stepped hole 14 includes a cylindrical hole 1401 and a prismatic hole 1402. An anti-detachment section 1 and an anti-rotation section 2 are respectively located in the cylindrical hole 1401 and the prismatic hole 1402.

[0043] The space enclosed by the cylindrical hole 1401 is cylindrical, and the space enclosed by the prismatic hole 1402 is prismatic.

[0044] The beneficial effects of adopting the above technical solution are: the cylindrical hole 1401 of the stepped hole 14 cooperates with the anti-detachment section 1, and the prismatic hole 1402 cooperates with the anti-rotation section 2, preventing the nut from rotating and falling off in the injection molded part 13, thus ensuring the overall stability and reliability of the composite injection molded insert.

[0045] In one embodiment, the cylindrical cavity 402 can be of specifications M3, M4, M5, M6, M7, or M8.

[0046] In one embodiment, the stamped riveting nut is made of 1215 stainless steel with color-plated zinc, conforming to the American Society for Testing and Materials (ASTM) standard. The product requires heat treatment, achieving a post-treatment HRC of 36-44 (HV: 360-440). This translates to a Rockwell hardness of 36 to 44 HRC and a Vickers hardness of 360 to 440. It complies with the RoHS Directive, which restricts the use of certain hazardous substances in electrical and electronic equipment. Electroplating requirements: 5µm to 12µm zinc plating across the entire surface, followed by iridescent passivation. A 120-hour salt spray test is conducted; no red rust is observed on the surface. The test method follows ASTM B117.

[0047] In some embodiments, the apex corner (i.e., the third outer fillet 12) of the regular polygonal outer wall of the anti-rotation segment 2 adopts a parabolic transition fillet, the mathematical expression of which is y=a(xh)+k, where the vertex coordinates (h,k) are located on the bisector of the polygon's apex corner, and the radius of curvature R is dynamically adjusted according to the nut specification (0.4-0.6mm for M3-M5, 0.8-1.2mm for M6-M8). The fillet surface is coated with a laser-laminated ceramic coating with a thickness of 0.1-0.2mm and a hardness of HV1200 or higher.

[0048] The beneficial effect of adopting the above technical solution is that it is particularly suitable for high-frequency vibration scenarios such as aerospace.

[0049] The stamped riveting nut of this application is drawn into the required shape and structure through a deep-drawing process, and the flange is stamped into a hexagon or pentagon. This structural design mainly ensures the torque after riveting through the hexagon or pentagon, and the flange shape ensures the pull-out force between the nut and the plate after riveting. Firstly, hexagonal or pentagonal flanges ensure greater torque. Secondly, the cost is significantly reduced due to the change to stamping. Thirdly, it can accommodate torque designs to meet the needs of multiple customers.

[0050] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A stamped riveting nut, characterized in that, include: The anti-detachment section is a rotating body, and the radial dimension of the outer wall of the anti-detachment section gradually changes along the axial direction; The anti-rotation section has a radial dimension on its outer wall that varies along the circumference. The cylindrical segment has a circular outer wall. The anti-detachment section, anti-rotation section, and cylindrical section are arranged coaxially along the axial direction, and the shaft end of the anti-detachment section has a blind hole. Along the axial direction away from the anti-rotation section, the radial dimension of the outer wall of the anti-detachment section gradually increases; The radial dimension of the outer wall of the anti-rotation section is greater than the radial dimension of the outer wall of the anti-detachment section and the outer wall of the cylindrical section.

2. The stamped riveting nut according to claim 1, characterized in that: The anti-detachment section, anti-rotation section, cylindrical section, and blind hole are integrated into a stamping structure, with the blind hole occupying the interior of the anti-detachment section, anti-rotation section, and cylindrical section.

3. The stamped riveting nut according to claim 1, characterized in that: The inner wall of the blind hole has a circular cross-sectional profile at any point. The outer wall of the anti-detachment section and the outer wall of the cylindrical section have circular cross-sectional profiles at any point. The outer wall of the anti-rotation section has a cross-sectional profile of a regular polygon with an outer rounded corner at the apex.

4. The stamped riveting nut according to claim 1, characterized in that: Along the depth direction of the blind hole, the blind hole is composed of a frustum cavity and a cylindrical cavity in sequence; the frustum cavity occupies the interior of the anti-detachment section, and the diameter of the frustum cavity gradually decreases along the depth of the blind hole; the cylindrical cavity occupies the interior of the anti-rotation section and the cylindrical section; the junction of the frustum cavity and the cylindrical cavity is transitioned by a second outer fillet.

5. The stamped riveting nut according to claim 1, characterized in that: Of the radial dimensions at both ends of the outer wall of the anti-detachment section, the radial dimension of the outer wall at the relatively larger end of the anti-detachment section is greater than the diameter of the outer wall of the cylindrical section, and the radial dimension of the outer wall at the relatively smaller end of the anti-detachment section is less than the diameter of the outer wall of the cylindrical section.

6. The stamped riveting nut according to claim 1, characterized in that: The cylindrical section, the anti-detachment section, and the anti-rotation section each have progressively shorter axial lengths and progressively thinner radial thicknesses.

7. The stamped riveting nut according to claim 1, characterized in that: The bottom edge of the blind hole has a third inner rounded corner, the junction of the outer walls of the anti-detachment section and the anti-rotation section has a first inner rounded corner, the junction of the outer walls of the anti-rotation section and the cylindrical section has a second inner rounded corner, and the outer wall of the end of the cylindrical section away from the anti-rotation section has a first outer rounded corner.

8. The stamped riveting nut according to claim 1, characterized in that: The cross-sectional profile of the outer wall of the anti-rotation section is a regular hexagon or regular pentagon with an outer rounded corner at the apex.

9. The stamped riveting nut according to claim 1, characterized in that: The stamped riveting nut is made of 1215 color zinc plating, with a zinc plating thickness of 5µm to 12µm.

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