Single-sided connecting bolt nail sleeve deformation resistance detection tool

Abstract

The utility model discloses a single face connects bolt nail cover deformation resistance detection frock belongs to the detection technical field of single face connecting bolt, in order to solve the problem that direct nail cover deformation resistance can not be detected in prior art, single face connects bolt nail cover deformation resistance detection frock includes the vertical core rod model (9), and the core rod model (9) is equipped with the nail cover compression cylinder (2) and the nail body model (3) outside, and the nail cover (7) of waiting for testing can be equipped with in the core rod model (9) outside, and the lower extreme of nail cover compression cylinder (2) can be with the upper end of nail cover (7) of waiting for testing and abuts, and the upper end of nail body model (3) can be with the lower end of nail cover (7) of waiting for testing and abuts, and the nail body model (3) is equipped with the interlayer model (5) outside. Single face connects bolt nail cover deformation resistance detection frock can directly detect the deformation resistance in the nail cover forming process, and the deformation resistance of nail cover is measured, and the nail cover structure size and heat treatment system are adjusted, guided.

Description

Technical Field

[0001] This utility model relates to the field of single-sided connecting bolt testing technology, specifically a tooling for testing the deformation resistance of single-sided connecting bolt sleeves. Background Technology

[0002] In aerospace equipment, single-sided bolts are typically used for installation when the structure is compact or the installation space is confined. A single-sided bolt usually consists of five parts: a mandrel, a bolt body, a bolt sleeve, a ring, and a nut. During installation, the mandrel rotates, driving the nut to move axially. The bolt sleeve, subjected to the axial force of the nut, moves along the cone angle of the bolt body towards the clamping surface. Upon contact with the clamping surface, it forms an upset head. When the upset head diameter is large enough, the mandrel breaks off at the neck groove, completing the installation.

[0003] Throughout the installation and use process, the torque provided by the mandrel mainly overcomes the friction between the mandrel and the countersunk surface of the nail body, as well as the friction between the nut and the mandrel. The normal force providing the source of friction is mainly the deformation resistance of the nail sleeve, and the magnitude of the deformation resistance directly affects the normal force in the friction formula. Therefore, the deformation resistance is an important material parameter of the nail sleeve, and the magnitude of the nail sleeve's deformation resistance directly affects the diameter of the mandrel's neck groove and the matching of the friction coefficient between the threaded pairs and between the countersunk recess of the nail body and the countersunk surface of the mandrel.

[0004] Currently, testing the deformation resistance of single-sided connecting bolts typically requires machining all five parts of the bolt before debugging, installation, and mechanical testing. Each single-sided connecting bolt can only be tested once. Existing methods for testing the deformation resistance of single-sided connecting bolt sleeves suffer from long testing cycles and high production costs. Furthermore, there are no methods or means to directly test the deformation resistance of the sleeves. In the design and process design of single-sided connecting bolt parts, the installation effect can only be judged based on the single-sided connection installation results. The assembly installation results cannot be used to determine the factors affecting the installation effect of the single-sided connecting bolt through the deformation resistance of the sleeves, making it difficult to analyze the deformation resistance of the sleeves. Utility Model Content

[0005] To address the problem of not being able to directly detect the deformation resistance of bolt sleeves in existing technologies, this invention provides a single-sided connecting bolt sleeve deformation resistance detection fixture. This fixture can directly detect the deformation resistance of the bolt sleeve (during installation and use) during its forming process. By measuring the deformation resistance of the bolt sleeve, adjustments and guidance can be provided to the bolt sleeve's structural dimensions and heat treatment process. Furthermore, installation tests can be conducted without requiring the core rod, bolt body, and nut to be fully machined, improving testing efficiency and reducing R&D costs.

[0006] The technical solution adopted by this utility model embodiment to solve its technical problem is:

[0007] A fixture for testing the deformation resistance of a single-sided connecting bolt sleeve includes an upright core rod model. The core rod model is covered with a sleeve compression cylinder and a nail body model. The sleeve compression cylinder and the nail body model are spaced apart vertically. The sleeve to be tested can be fitted over the core rod model. The lower end of the sleeve compression cylinder can abut against the upper end of the sleeve to be tested, and the upper end of the nail body model can abut against the lower end of the sleeve to be tested. The nail body model is covered with a sandwich model.

[0008] Along the axial direction of the core rod model, the core rod model contains a head and a rod connected in sequence; the diameter of the head is larger than the diameter of the rod, the head faces downward, and the nail sleeve to be tested can be clearance-fitted with the core rod model.

[0009] The nail sleeve compression cylinder is a cylindrical structure with open ends. The nail sleeve compression cylinder and the core rod model have a clearance fit or transition fit. The nail sleeve compression cylinder contains a cylinder wall and an inner cavity. The upper end of the core rod model is located in the lower part of the inner cavity.

[0010] The outer diameter of the nail sleeve compression cylinder is larger than the outer diameter of the nail sleeve to be tested, the compression strength of the nail sleeve compression cylinder is greater than the compression strength of the nail sleeve to be tested, and the height of the nail sleeve compression cylinder is 1.5 to 3 times the height of the nail sleeve to be tested.

[0011] The nail body model is a cylindrical structure with open ends. The nail body model and the core rod model have a clearance fit or transition fit. The lower end face of the nail body model is flush with the lower end face of the core rod model. The compressive strength of the nail body model is greater than the compressive strength of the nail sleeve to be tested.

[0012] Along the axial direction of the nail body model, the outer circumference of the nail body model contains an upper conical surface segment, a cylindrical surface segment, and a lower conical surface segment arranged sequentially from top to bottom. The outer diameter of the cylindrical surface segment is larger than the inner diameter of the nail sleeve to be tested.

[0013] The upper part of the upper conical section can be inserted into the lower end of the nail sleeve to be tested. The upper conical section is provided with multiple strip-shaped protrusions, which are evenly spaced along the circumference of the upper conical section.

[0014] The sandwich model and the nail model have a clearance fit or a transition fit. The lower end face of the sandwich model is flush with the lower end face of the nail model, and the upper end face of the sandwich model is lower than the upper end of the cylindrical section.

[0015] The single-sided connecting bolt sleeve deformation resistance testing fixture also includes a sandwich adjustment shim, which is stacked and connected to the sandwich model. The sandwich adjustment shim and the nail body model are in a clearance fit or transition fit, and the upper end face of the sandwich adjustment shim is lower than the upper end of the cylindrical surface section.

[0016] The core rod model and the nail body model are connected and fixed together as one unit.

[0017] The beneficial effects of this utility model embodiment are:

[0018] 1. Directly test the deformation resistance of the nail sleeve (for installation and use) during the forming process. By measuring the deformation resistance of the nail sleeve, adjust and guide the structural dimensions and heat treatment process of the nail sleeve.

[0019] 2. Installation and testing can be carried out without the need to process the core rod, nail body, and nut completely, which improves testing efficiency and reduces R&D investment costs.

[0020] 3. It can analyze the consistency of the deformation resistance of the staple sleeve. It can compare staple sleeves with different structural dimensions and heat treatment regimes that affect the deformation resistance of the staple sleeve, and generate deformation resistance curves. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0022] Figure 1 This is a front view schematic diagram of the single-sided connecting bolt sleeve deformation resistance detection tool described in this utility model.

[0023] Figure 2 This is a three-dimensional schematic diagram of the single-sided connecting bolt sleeve deformation resistance testing fixture of this utility model.

[0024] Figure 3 This is a schematic diagram of the core rod model.

[0025] Figure 4 This is a schematic diagram of the nail body model.

[0026] Figure 5 This is a schematic diagram of the nail sleeve before it is pressed down.

[0027] Figure 6 This is a schematic diagram of the nail sleeve being pressed down.

[0028] Figure 7 This is a schematic diagram of the deformation resistance curve.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Upper indenter of tensile testing machine; 2. Nail sleeve compression cylinder; 3. Nail body model; 4. Sandwich adjustment shim; 5. Sandwich model; 6. Lower indenter of tensile testing machine; 7. Nail sleeve to be tested; 8. Ring; 9. Core rod model;

[0031] 21. Cylinder wall; 22. Cylinder cavity;

[0032] 31. Upper conical surface segment; 32. Cylindrical surface segment; 33. Lower conical surface segment; 34. Strip-shaped convex ridge;

[0033] 91. Head; 92. Rod. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The lower side of the middle, the directional word "left" indicates Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 1 The direction of the paper and the direction pointing inwards; the directional word "back" indicates perpendicular to. Figure 1 The direction of the orientation is towards the outside of the paper. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them based on actual needs or a limited number of experiments.

[0036] like Figures 1 to 2 As shown in the embodiment of this utility model, a single-sided connecting bolt sleeve deformation resistance testing fixture includes an upright core rod model 9. The core rod model 9 is covered with a sleeve compression cylinder 2 and a nail body model 3. The sleeve compression cylinder 2 and the nail body model 3 are arranged vertically at intervals. The sleeve to be tested 7 can be sleeved on the core rod model 9. The lower end of the sleeve compression cylinder 2 can abut against the upper end of the sleeve to be tested 7, and the upper end of the nail body model 3 can abut against the lower end of the sleeve to be tested 7. The nail body model 3 is covered with a sandwich model 5.

[0037] As one possible implementation method, such as Figure 1 and Figure 3 As shown, the core rod model 9 is an upright cylindrical structure. Along the axial direction of the core rod model 9, the core rod model 9 contains a head 91 and a rod 92 connected in sequence. The diameter of the head 91 is larger than the diameter of the rod 92. The head 91 faces downward, and the nail sleeve 7 to be tested can be fitted with the core rod model 9 with a clearance.

[0038] The purpose of mandrel model 9 is to simulate the mandrel in a real single-sided connecting bolt. Mandrel model 9 can be made of high-hardness, high-wear-resistant materials and can be reused multiple times.

[0039] As one possible implementation, the nail sleeve compression cylinder 2 is an upright cylindrical structure with open upper and lower ends. The nail sleeve compression cylinder 2 is clearance-fitted or transition-fitted with the core rod model 9. The nail sleeve compression cylinder 2 contains a cylinder wall 21 and an inner cavity 22. The upper end of the core rod model 9 is located in the lower part of the inner cavity 22.

[0040] The function of the rivet compression cylinder 2 is to simulate the nut in a real single-sided connection bolt. The rivet compression cylinder 2 can be made of high hardness and high wear resistance material and can be reused multiple times.

[0041] As one possible implementation, the outer diameter of the nail sleeve compression cylinder 2 is larger than the outer diameter of the nail sleeve 7 to be tested, the inner diameter of the nail sleeve compression cylinder 2 is smaller than the inner diameter of the nail sleeve 7 to be tested, the compression strength of the nail sleeve compression cylinder 2 is greater than the compression strength of the nail sleeve 7 to be tested, and the height of the nail sleeve compression cylinder 2 is 1.5 to 3 times the height of the nail sleeve 7 to be tested.

[0042] As one possible implementation method, such as Figure 1 As shown, the nail body model 3 is a cylindrical structure with both ends open. The nail body model 3 and the core rod model 9 are either clearance-fitted or transition-fitted. The lower end face of the nail body model 3 and the lower end face of the core rod model 9 are flush. The lower end face of the nail body model 3 and the lower end face of the core rod model 9 are located in the same horizontal plane. The compressive strength of the nail body model 3 is greater than the compressive strength of the nail sleeve 7 to be tested.

[0043] The purpose of nail body model 3 is to simulate the nail body in a real single-sided connection bolt. Nail body model 3 can be made of high hardness and high wear resistance materials and can be reused multiple times.

[0044] like Figure 1 and Figure 4 As shown, along the axial direction of the nail body model 3, the outer peripheral surface of the nail body model 3 contains an upper conical surface segment 31, a cylindrical surface segment 32, and a lower conical surface segment 33 arranged sequentially from top to bottom. The top ends of the upper conical surface segment 31 and the lower conical surface segment 33 are both facing upwards, and the bottom ends of the upper conical surface segment 31 and the lower conical surface segment 33 are both facing downwards. The outer diameter of the cylindrical surface segment 32 is larger than the inner and outer diameters of the nail sleeve 7 to be tested.

[0045] As an alternative implementation, the upper part of the upper conical section 31 can be inserted into the lower end of the nail sleeve 7 to be tested. The upper conical section 31 is provided with a plurality of strip-shaped protrusions 34, which extend along the generatrix direction of the upper conical section 31, and the plurality of strip-shaped protrusions 34 are evenly spaced along the circumference of the upper conical section 31.

[0046] The test nail sleeve 7 is the object to be tested. In order to better simulate the real situation, the lower end of the test nail sleeve 7 is fitted with a ring 8 (also called the test ring). The ring 8 is the ring in the actual single-sided connecting bolt. The upper part of the upper conical surface section 31 can abut against the lower end of the inner circumference of the ring 8.

[0047] As one possible implementation method, such as Figure 1 As shown, the sandwich model 5 is an upright cylindrical structure with open top and bottom ends. The outer diameter of the sandwich model 5 is much larger than the outer diameter of the cylindrical section 32. The sandwich model 5 and the nail body model 3 are fitted with a clearance or transition fit. The lower end face of the sandwich model 5 is flush with the lower end face of the nail body model 3, and the upper end face of the sandwich model 5 is lower than the upper end of the cylindrical section 32.

[0048] As an alternative implementation, the single-sided connecting bolt sleeve deformation resistance testing fixture also includes an interlayer adjustment shim 4. The thickness of the interlayer adjustment shim 4 can be 2mm to 5mm. The interlayer adjustment shim 4 and the interlayer model 5 are stacked and connected. The interlayer adjustment shim 4 and the nail body model 3 are in clearance fit or transition fit. The upper end surface of the interlayer adjustment shim 4 is lower than the upper end of the cylindrical surface section 32.

[0049] The purpose of the sandwich model 5 is to simulate the connection object of a real single-sided connecting bolt. Both the sandwich model 5 and the sandwich adjusting shim 4 can be made of high-hardness, high-wear-resistant materials, and both can be reused multiple times. The purpose of the sandwich adjusting shim 4 is to adjust and control the total thickness of the sandwich adjusting shim 4 and the sandwich model 5.

[0050] As an alternative implementation, the core rod model 9 and the nail body model 3 can be a separate structure or an integrated structure. For example, the core rod model 9 and the nail body model 3 can be connected and fixed as one unit, that is, the core rod model 9 and the nail body model 3 are connected as a single part.

[0051] The following describes the testing process for testing the deformation resistance of the single-sided connecting bolt sleeve 7 using the aforementioned single-sided connecting bolt sleeve deformation resistance testing fixture.

[0052] The testing equipment uses a tensile testing machine and a metal compression method. First, the nail body model 3 is inserted into the sandwich model 5. Depending on the sandwich requirements, the sandwich adjustment shim 4 is inserted into the nail body model 3. Then, the core rod model 9 is inserted into the hole of the nail body model 3. The single-sided connecting bolt sleeve deformation resistance testing fixture is placed on the lower pressure head 6 of the tensile testing machine. The ring 8 is placed into the stepped hole at the lower end of the nail sleeve 7 to be tested. Then, the nail sleeve 7 to be tested and the nail sleeve compression cylinder 2 are sequentially placed on the core rod model 9. The nail sleeve compression cylinder 2, the nail sleeve 7 to be tested, and the nail body model 3 abut against each other sequentially from top to bottom. The upper pressure head 1 of the tensile testing machine is moved to press against the nail sleeve compression cylinder 2. Figure 5 As shown.

[0053] The sum of the thicknesses of the interlayer adjusting shim 4 and the interlayer model 5 is consistent with the interlayer thickness of the installation test plate; the size of the nail body model 3 is consistent with the nail body size of the single-sided connecting bolt, and it is made of high-hardness, high-wear-resistant material and can be reused; the core rod model 9 matches the nail body model 3. Simulating the riveting process of the single-sided connecting bolt, the upper pressure head 1 and the lower pressure head 6 of the tensile testing machine move towards each other, and the distance between them gradually decreases. The upper pressure head 1 pushes the nail sleeve compression cylinder 2 downwards, and the nail sleeve compression cylinder 2 presses down on the nail sleeve 7 to be tested. During the deformation process, the lower end of the nail sleeve 7 to be tested becomes larger (moving radially towards the edge of the interlayer model 5 along the core rod model 9). The nail sleeve compression cylinder 2 replaces the actual single-sided connecting nut, compressing the nail sleeve in the single-sided connecting bolt to form an upsetting head, such as... Figure 6 As shown, the deformation resistance value forming the upset head diameter is recorded simultaneously, and the deformation resistance curve of the nail sleeve is generated, as shown. Figure 7 As shown in the figure. In the deformation resistance curve of the nail sleeve, the horizontal axis represents the displacement of the upper pressure head 1 of the tensile testing machine relative to the lower pressure head 6 of the tensile testing machine, and the vertical axis represents the force of the upper pressure head 1 pressing down.

[0054] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. A fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve, characterized in that, The single-sided connecting bolt sleeve deformation resistance testing fixture includes an upright core rod model (9), a sleeve compression cylinder (2) and a nail body model (3) are provided on the core rod model (9), the sleeve compression cylinder (2) and the nail body model (3) are arranged at intervals, the sleeve to be tested (7) can be sleeved on the core rod model (9), the lower end of the sleeve compression cylinder (2) can abut against the upper end of the sleeve to be tested (7), the upper end of the nail body model (3) can abut against the lower end of the sleeve to be tested (7), and the nail body model (3) is provided with a sandwich model (5) on the outside.

2. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 1, characterized in that, Along the axial direction of the core rod model (9), the core rod model (9) contains a head (91) and a rod (92) connected in sequence; the diameter of the head (91) is larger than the diameter of the rod (92), the head (91) faces downward, and the nail sleeve (7) to be tested can be fitted with the core rod model (9) with a clearance.

3. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 1, characterized in that, The nail sleeve compression cylinder (2) is a cylindrical structure with both ends open. The nail sleeve compression cylinder (2) and the core rod model (9) are in clearance fit or transition fit. The nail sleeve compression cylinder (2) contains a cylinder wall (21) and an inner cavity (22). The upper end of the core rod model (9) is located in the lower part of the inner cavity (22).

4. The single-sided connecting bolt sleeve deformation resistance testing fixture according to claim 3, characterized in that, The outer diameter of the nail sleeve compression cylinder (2) is larger than the outer diameter of the nail sleeve (7) to be tested, the compression strength of the nail sleeve compression cylinder (2) is greater than the compression strength of the nail sleeve (7) to be tested, and the height of the nail sleeve compression cylinder (2) is 1.5 to 3 times the height of the nail sleeve (7) to be tested.

5. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 1, characterized in that, The nail body model (3) is a cylindrical structure with open ends. The nail body model (3) and the core rod model (9) are in clearance fit or transition fit. The lower end face of the nail body model (3) and the lower end face of the core rod model (9) are flush. The compressive strength of the nail body model (3) is greater than the compressive strength of the nail sleeve (7) to be tested.

6. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 1, characterized in that, Along the axial direction of the nail body model (3), the outer peripheral surface of the nail body model (3) contains an upper conical surface segment (31), a cylindrical surface segment (32) and a lower conical surface segment (33) arranged sequentially from top to bottom. The outer diameter of the cylindrical surface segment (32) is larger than the inner diameter of the nail sleeve (7) to be tested.

7. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 6, characterized in that, The upper part of the upper conical section (31) can be inserted into the lower end of the nail sleeve (7) to be tested. Multiple strip-shaped protrusions (34) are provided on the upper conical section (31), and the multiple strip-shaped protrusions (34) are evenly spaced along the circumference of the upper conical section (31).

8. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 6, characterized in that, The sandwich model (5) and the nail body model (3) are fitted with a clearance or transition fit. The lower end face of the sandwich model (5) is flush with the lower end face of the nail body model (3), and the upper end face of the sandwich model (5) is lower than the upper end of the cylindrical surface section (32).

9. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 6, characterized in that, The single-sided connecting bolt sleeve deformation resistance detection tool also includes a sandwich adjustment shim (4), the sandwich adjustment shim (4) and the sandwich model (5) are stacked and connected, the sandwich adjustment shim (4) and the nail body model (3) are in clearance fit or transition fit, and the upper end of the sandwich adjustment shim (4) is lower than the upper end of the cylindrical surface section (32).

10. The fixture for detecting the deformation resistance of a single-sided connecting bolt sleeve according to claim 1, characterized in that, The core rod model (9) and the nail body model (3) are connected and fixed together.

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