A combined tool for pressure forming a self-locking nut

Abstract

The utility model discloses a kind of combined tool for self-locking nut pressure forming, comprising: pressure mould and profiling mandrel;Pressure mould includes: symmetrically arranged left pressure mould and right pressure mould, the side wall of left pressure mould and right pressure mould is respectively provided with left pressure cavity and right pressure cavity for placing self-locking nut in interlocking;The shape of left pressure cavity and right pressure cavity is matched with the shape of self-locking nut;The side wall of left pressure cavity and right pressure cavity is all set into forming hole, and profiling mandrel is set in forming hole, and self-locking nut is pressed tightly.The combined tool in the utility model is easy to operate, and can greatly improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of self-locking nut technology, and more specifically to a combination tooling for compressive forming of self-locking nuts. Background Technology

[0002] Self-locking nuts, as special fasteners used in aerospace, have the core function of preventing loosening due to vibration, impact, or dynamic loads, thereby ensuring the long-term stability and safety of the connection. Due to the unique shape of self-locking nuts under pressure forming, their performance is currently tested using a press and related molds. However, this production method suffers from long mold manufacturing cycles and high production costs.

[0003] Therefore, developing a convenient and efficient combination tooling for the compression forming of self-locking nuts is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention provides a convenient and efficient combination tooling for the compression forming of self-locking nuts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A combination tooling for compression forming of self-locking nuts, characterized in that it comprises:

[0007] The pressure mold includes a left pressure mold and a right pressure mold arranged symmetrically. The side walls of the left pressure mold and the right pressure mold that interlock are respectively provided with a left pressure cavity and a right pressure cavity for placing a self-locking nut. The shapes of the left pressure cavity and the right pressure cavity are matched with the shape of the self-locking nut.

[0008] The contour mandrel has forming holes on the side walls of both the left and right pressure chambers. The contour mandrel is placed inside the forming holes and presses against the self-locking nut.

[0009] The beneficial effects of adopting the above technical solution are that the combined tooling is designed to match the shape of the product through the principle of contouring, and uses the contouring mandrel to symmetrically press and form the self-locking nut, which meets the requirements of the product locking performance test; the combined tooling is easy to position and simple to operate, avoiding the disadvantages of high mold price and long production cycle, and has significant economic benefits.

[0010] Preferably, both the left and right pressure dies are provided with threaded holes on their tops for connection with the punch press platform.

[0011] Preferably, the top of both the left and right pressure molds is provided with a receiving groove for accommodating the head of the self-locking nut.

[0012] Preferably, the connection between the head of the self-locking nut and the rod portion forms an arc surface, and the tops of the left and right pressure chambers have contoured fixed arc surfaces that mate with the arc surface of the self-locking nut. The matching and close fit between the contoured fixed arc surfaces and the arc surface improves the accuracy of positioning the self-locking nut.

[0013] Preferably, the contour mandrel is interference-fitted with the forming hole. The interference fit ensures that the contour mandrel is more firmly fixed within the forming hole.

[0014] Preferably, the contour mandrel has a shaped arc surface on the side near the self-locking nut that mates with the side of the self-locking nut rod.

[0015] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a combined tooling for the compression forming of self-locking nuts, the beneficial effects of which are:

[0016] (1) By designing tooling that matches the product shape using the principle of contouring, the self-locking nut can be accurately positioned. Furthermore, by pressing the self-locking nut with the contouring mandrel, the self-locking nut can be deformed under pressure, thus obtaining a self-locking nut that can withstand pressure. This meets the product's locking performance test requirements. Moreover, the tooling is easy to position and simple to operate, avoiding the disadvantages of high mold prices and long production cycles, and has significant economic benefits.

[0017] (2) By simultaneously pressing the self-locking nut with the contour mandrel in the left and right pressure molds, the deformation amount can be effectively controlled to meet the requirements of the self-locking nut locking performance test; at the same time, the corresponding contour mandrel can be designed according to the deformation amount requirements of the self-locking nut, which has strong adaptability. Attached Figure Description

[0018] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 The attached figure is a structural schematic diagram of the self-locking nut before being compressed provided by this utility model;

[0020] Figure 2 The attached figure is a structural schematic diagram of the left pressure mold provided by this utility model;

[0021] Figure 3The attached figure is a schematic diagram of the structure of the contour mandrel provided by this utility model;

[0022] Figure 4 The attached figure is an exploded view of the structure of the left-side pressure mold and the contour mandrel provided by this utility model;

[0023] Figure 5 The attached figure is a structural assembly diagram of the left-side pressure mold and the contour mandrel provided by this utility model;

[0024] Figure 6 The attached figure is a working diagram of the left pressure mold provided by this utility model;

[0025] Figure 7 The attached figure is an overall assembly diagram of the left and right pressure molds provided by this utility model;

[0026] Figure 8 The attached figure is a detailed dimensional drawing of the self-locking nut under pressure provided by this utility model;

[0027] Figure 9 The attached figure shows a product diagram of the self-locking nut under pressure provided by this utility model.

[0028] In the figure,

[0029] 1-Left pressure mold;

[0030] 11-Left pressure chamber;

[0031] 2-Right pressing mold;

[0032] 3-Self-locking nut;

[0033] 31-Head; 32-Bar; 33-Curved surface;

[0034] 4- Contouring mandrel;

[0035] 41 - Formed arc surface;

[0036] 5-Forming hole; 6-Threaded hole; 7-Receiving groove; 8-Contour-fixed arc surface; 9-Pressure-forming surface. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] This utility model discloses a combined tooling for compression forming of self-locking nuts, comprising:

[0039] The pressure mold includes a left pressure mold 1 and a right pressure mold 2 arranged symmetrically. The side walls of the left pressure mold 1 and the right pressure mold 2 that interlock are respectively provided with a left pressure cavity 11 and a right pressure cavity for placing a self-locking nut 3. The shapes of the left pressure cavity 11 and the right pressure cavity are matched with the shape of the self-locking nut.

[0040] The contour mandrel 4 has forming holes 5 on the side walls of both the left and right pressure chambers 11 and 11. The contour mandrel 4 is positioned within the forming holes 5 and presses against the self-locking nut 3. This fixture utilizes the arc-shaped feature of the self-locking nut 3 under pressure, employing a contour mandrel 4 with a contour design. External force guides the contour mandrel 4 to compress the self-locking nut 3, achieving the pressure condition. Using this fixture to compress and form the self-locking nut 3 not only facilitates operation but also significantly improves production efficiency, while avoiding the drawbacks of high mold prices and long production cycles.

[0041] In one embodiment, both the left pressure die 1 and the right pressure die 2 are provided with threaded holes 6 on their tops for connection with the punch press platform. The left pressure die 1 and the right pressure die 2 are respectively connected to the punch press platform to ensure the stability of the self-locking nut 3 under pressure.

[0042] In one embodiment, the top of both the left pressure mold 1 and the right pressure mold 2 is provided with a receiving groove 7 for accommodating the head 31 of the self-locking nut 3. A contoured positioning surface is formed at the bottom of the receiving groove 7, which fits against the bottom of the head 31 of the self-locking nut 3 to ensure the accuracy of the self-locking nut 3 in the left pressure mold 1 and the right pressure mold 2.

[0043] In one embodiment, an arc surface 33 is formed at the connection between the head 31 and the rod 32 of the self-locking nut 3, and contoured fixing arc surfaces 8 are formed at the top of the left and right pressure chambers 11 and 32 to match the arc surface 33 of the self-locking nut 31. The arc surface 33 ensures that the self-locking nut 3 fits accurately in the left and right pressure chambers 11, thereby ensuring the accuracy of the pressure forming.

[0044] In one embodiment, the mandrel 4 is interference-fitted with the forming hole 5. By applying external force, the mandrel 4 is pressed into the forming hole 5. The interference fit ensures that the mandrel 4 accurately presses the self-locking nut 3.

[0045] In one embodiment, the profiled mandrel 4 is provided with a shaped arc surface 41 on the side near the self-locking nut 3, which mates with the side of the rod portion of the self-locking nut 3.

[0046] The self-locking nut 3 is placed in the left pressure chamber 11 and the right pressure chamber, and the left pressure mold 1 and the right pressure mold 2 are closed. External force is applied to compress the left pressure mold 1 and the right pressure mold 2, while the contour mandrel 4 presses the self-locking nut 3, causing the self-locking nut 3 to deform under pressure. Figure 8As shown, before being compressed, the rod 21 of the self-locking nut 3 is a standard cylindrical shape with a radial dimension of L1. After being compressed, the radial dimension at the compression forming surface 9 is L2, and the change in radial dimension under compression is L1-L2. The compression radius is R. The conforming mandrel 4 is designed based on the deformation of the self-locking nut 3 under compression, i.e., the radial length and the R angle dimension. To ensure the stability of the conforming mandrel 4 under compression, a matching left compression mold 1 and right compression mold 2 are designed to effectively control the deformation and meet the locking performance test requirements of the self-locking nut 3.

[0047] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combination tooling for compression forming of self-locking nuts, characterized in that, include: The pressure mold includes a left pressure mold and a right pressure mold arranged symmetrically. The side walls of the left pressure mold and the right pressure mold that interlock are respectively provided with a left pressure cavity and a right pressure cavity for placing a self-locking nut. The shapes of the left pressure cavity and the right pressure cavity are matched with the shape of the self-locking nut. The contour mandrel has forming holes on the side walls of both the left and right pressure chambers. The contour mandrel is placed inside the forming holes and presses against the self-locking nut.

2. The combined tooling for compressive forming of self-locking nuts according to claim 1, characterized in that, Both the left and right pressure dies have threaded holes on their tops for connecting to the punch press platform.

3. The assembly tooling for compression forming of self-locking nuts according to claim 2, characterized in that, The top of both the left and right pressure molds is provided with a receiving groove for accommodating the head of the self-locking nut.

4. The combined tooling for compression forming of self-locking nuts according to claim 3, characterized in that, The connection between the head of the self-locking nut and the rod forms an arc surface, and the top of the left and right pressure chambers forms a contoured fixed arc surface that matches the arc surface of the self-locking nut.

5. The assembly tooling for compression forming of self-locking nuts according to claim 1, characterized in that, The contour mandrel is interference-fitted with the forming hole.

6. The combined tooling for compressive forming of self-locking nuts according to claim 5, characterized in that, The contoured mandrel has a shaped arc surface on the side near the self-locking nut that mates with the side of the self-locking nut rod.

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