Hexagonal flange face lock nut pressing point die

Abstract

The utility model relates to the field of point pressing die, disclose a hexagonal flange face locking nut point pressing die, including mounting seat, the mounting seat is fixed in the bottom of mould body, the punch is fixed on the mould body, a plurality of forming cavities are set up on the punch, a plurality of the forming cavities are gradually narrowed from inside to outside, and a plurality of forming cavities form triangular pyramid, be equipped with a plurality of pressure feet on the mould body. In the utility model, through the cooperation of mounting seat, mould body, punch, forming cavity, pressure foot, the shape of the point is improved from trapezoidal section to triangular pyramid section, the stress distribution of the point is more uniform, the early relaxation phenomenon caused by stress concentration is effectively avoided, the pretightening force of the nut in the vibration environment is further enhanced, and the stable operation of the connecting system is provided with strong guarantee.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure point molds, specifically a hexagonal flange face locking nut pressure point mold. Background Technology

[0002] All-metal hexagonal flange locknuts are a type of key fastener widely used in the automotive, aerospace, and heavy machinery industries. Their core function is to maintain the stability and reliability of the connection under vibration and impact loads by applying preload.

[0003] Currently, a common manufacturing process in the industry involves pressing pits into the flange surface of the nut. This involves pressing a recess into the nut surface using a mold, causing localized plastic deformation of the material and making it protrude towards the thread side. This increases the friction and mechanical interference of the threaded pair, thus achieving locking. However, this process has the following drawbacks: trapezoidal pressing pits can easily lead to stress concentration. Under vibration loads, these stress concentration points may become the starting point for microcracks or cause the plastic deformation layer to loosen too quickly, thereby reducing the nut's anti-loosening performance. Utility Model Content

[0004] The purpose of this invention is to provide a hexagonal flange face locking nut pressure point mold to solve the problem that trapezoidal pressure points easily lead to stress concentration. Under vibration load, the stress concentration point may become the starting point for microcrack initiation or cause the plastic deformation layer to loosen too quickly, thereby reducing the anti-loosening performance of the nut.

[0005] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a hexagonal flange face locking nut pressing point mold, including a mounting base, the mounting base being fixed to the bottom of the mold body, a punch being fixed on the mold body, the punch having a plurality of forming cavities, the plurality of forming cavities gradually narrowing from the inside out, the plurality of forming cavities forming a triangular pyramid, and the mold body having a plurality of pressing feet.

[0006] Preferably, the centerline of the molding cavity forms an angle of 45 degrees with the central axis of the mold body.

[0007] Preferably, the widest spacing of the molding cavities facing inward is 8 mm, and the narrowest spacing of the molding cavities facing outward is 4.3 mm.

[0008] Preferably, the height of each of the presser feet is 0.5mm and they are all the same height.

[0009] Preferably, the mold body has a through hole.

[0010] Preferably, the mounting base has mounting holes and the outer wall of the mounting base has mounting grooves.

[0011] Compared with the existing technology, the hexagonal flange face locking nut pressing point mold that adopts the above technical solution has the following beneficial effects: 1. In use, through the synergistic action of the mounting base, mold body, punch, forming cavity, and presser foot, the shape of the pressing point is improved from a trapezoidal cross section to a triangular pyramidal cross section, making the stress distribution of the pressing point more uniform, effectively avoiding early relaxation caused by stress concentration, further enhancing the preload of the nut under vibration environment, and providing a strong guarantee for the stable operation of the connection system. Second, in use, this specific 45-degree angle directly determines the apex angle of the triangular pyramid formed by the pressure point on the nut surface. This angle is a key geometric parameter to ensure that the metal material flows and deforms in the ideal direction, and can most effectively guide stress to be evenly distributed around the pressure point, solving the inherent defect of stress concentration at the root of traditional trapezoidal pressure points. The narrower tip ensures that the pressure point can generate sufficient local pressure to embed into the threaded pair, ensuring that the pressure point has sufficient structural strength and locking volume, while avoiding stress concentration caused by excessively narrow roots. The uniformly high pressure foot ensures that the forming depth of each pressure point is uniform, eliminating the problem of inconsistent pressure point depth caused by mold tilting or uneven workpiece placement. This design improves product consistency and is a key structure to ensure stable and controllable quality in mass production. Thirdly, during use, the through hole acts as a venting channel during the crimping process. When the punch presses against the nut surface at high speed, air inside the cavity can be quickly expelled through this hole, preventing air from being compressed and forming an "air cushion." This solves the venting problem in crimping, ensuring that the metal material can completely and fully fill the forming cavity, resulting in crimped points with clear contours and precise dimensions. The mounting holes and mounting grooves work together to quickly and accurately install and lock the entire mold module onto the actuator of the pressure control device using standard fasteners such as bolts, keys, or locating pins, providing strong support for the crimping production of nuts. Attached Figure Description

[0012] Figure 1 This is a plan view of an embodiment.

[0013] Figure 2 This is a cross-sectional schematic diagram of an embodiment.

[0014] In the diagram: 1. Mounting base; 2. Mold body; 3. Punch; 4. Forming cavity; 5. Presser foot; 6. Through hole; 7. Mounting hole; 8. Mounting groove. Detailed Implementation

[0015] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0016] like Figures 1-2As shown, a hexagonal flange face locking nut pressing point mold includes a mounting base 1, which is fixed to the bottom of the mold body 2. A punch 3 is fixed on the mold body 2. The punch 3 has several forming cavities 4, which gradually narrow from the inside to the outside, forming a triangular pyramid. The mold body 2 is provided with several pressing feet 5.

[0017] In use, the mold body 2 is adapted to the pressure control mode via the mounting base 1, completely eliminating the limitations of the traditional position control mode. During the crimping process, the pressure sensor monitors in real time, accurately measuring the crimping force. This pressure control method ensures that each nut is crimped under the same pressure conditions, rather than relying on a fixed pressure head displacement. The mold is specifically designed for the pressure control mode and can be perfectly integrated with pressure control systems (such as hydraulic or servo presses). When there are fluctuations in materials and equipment, the system can automatically compensate, effectively avoiding inconsistent crimping quality caused by material differences or equipment instability.

[0018] By optimizing the original trapezoidal cross-section of the pressure point into a triangular pyramid shape through several forming cavities 4, this innovative shape design enables a more uniform stress distribution. In traditional trapezoidal cross-section pressure points, stress tends to concentrate in localized areas, leading to problems such as microcrack initiation and plastic deformation relaxation. The triangular pyramid shape effectively avoids this drawback, reducing the generation of microcracks and the occurrence of plastic deformation. At the same time, under vibration conditions, this shape of pressure point can better maintain preload, improving the reliability and safety of the connection system, and significantly improving product yield and performance dispersion.

[0019] Through the coordinated action of mounting base 1, mold body 2, punch 3, forming cavity 4, and pressure foot 5, the shape of the pressure point is improved from a trapezoidal cross section to a triangular pyramidal cross section, making the stress distribution of the pressure point more uniform. This effectively avoids early relaxation caused by stress concentration, further enhances the preload of the nut under vibration, and provides a strong guarantee for the stable operation of the connection system.

[0020] like Figures 1-2 As shown, the centerline of the molding cavity 4 forms an angle of 45 degrees with the central axis of the mold body 2.

[0021] In use, during the pressing process, the specific 45-degree angle directly determines the apex angle of the triangular pyramid formed by the pressing point on the nut surface. This angle is a key geometric parameter to ensure that the metal material flows and deforms in the ideal direction. It can most effectively guide the stress to be evenly distributed in the area around the pressing point, solving the inherent defect of stress concentration at the root of the traditional trapezoidal pressing point.

[0022] like Figures 1-2As shown, the widest spacing of the forming cavity 4 facing inward is 8mm, the narrowest spacing of the forming cavity 4 facing outward is 4.3mm, and the height of several presser feet 5 is 0.5mm, and the heights are consistent.

[0023] In use, this gradually spaced structure provides a smooth channel for the plastic flow of the flange metal during the pressing of the punch 3. The wider root allows sufficient material to participate in deformation, while the narrower tip ensures that the pressing point can generate sufficient local pressure to embed into the threaded pair. This ensures that the pressing point has sufficient structural strength and locking volume, while avoiding stress concentration caused by an excessively narrow root. When the pressing cycle begins, all pressing feet 5, with a consistent height of 0.5mm, first contact the nut flange face, providing a precise initial reference plane for the pressing stroke of the punch 3. The consistent height of the pressing feet 5 ensures uniform forming depth of each pressing point, eliminating the problem of inconsistent pressing point depth caused by mold tilting or uneven workpiece placement. This design improves product consistency and is a key structure for ensuring stable and controllable quality in mass production.

[0024] like Figures 1-2 As shown, the mold body 2 has a through hole 6, the mounting base 1 has a mounting hole 7, and the outer wall of the mounting base 1 has a mounting groove 8.

[0025] During use, the through hole 6 acts as an venting channel during the crimping process. When the punch 3 presses against the nut surface at high speed, the air in the cavity can be quickly discharged through this hole, preventing the air from being compressed and forming an "air cushion." This solves the venting problem in the crimping process, ensuring that the metal material can completely and fully fill the forming cavity 4, resulting in a crimped point with a clear outline and precise dimensions. The mounting hole 7 and the mounting groove 8 work together to quickly and accurately install and lock the entire mold module onto the actuator of the pressure control device using standard fasteners such as bolts, keys, or locating pins, providing strong support for the crimping production of nuts.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hexagonal flange face locking nut pressing point mold, comprising a mounting base (1), said mounting base (1) being fixed to the bottom of the mold body (2), characterized in that, The mold body (2) is fixed with a punch (3), and the punch (3) has several forming cavities (4). The several forming cavities (4) gradually narrow from the inside to the outside, and the several forming cavities (4) form a triangular pyramid. The mold body (2) is provided with several presser feet (5).

2. The hexagonal flange face locking nut pressing point mold according to claim 1, characterized in that: The centerline of the molding cavity (4) forms an angle of 45 degrees with the central axis of the mold body (2).

3. The hexagonal flange face locking nut pressing point mold according to claim 2, characterized in that: The widest spacing of the molding cavities (4) facing inward is 8 mm, and the narrowest spacing of the molding cavities (4) facing outward is 4.3 mm.

4. The hexagonal flange face locking nut pressing point mold according to claim 1, characterized in that: The height of each of the presser feet (5) is 0.5 mm and they are all the same.

5. A hexagonal flange face locking nut pressing point mold according to claim 4, characterized in that: The mold body (2) has a through hole (6).

6. The hexagonal flange face locking nut pressing point mold according to claim 1, characterized in that: The mounting base (1) has a mounting hole (7) and the outer wall of the mounting base (1) has a mounting groove (8).

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