Screw hole failure torque testing device

Abstract

The utility model provides a screw hole failure torque testing device. The screw hole failure torque testing device comprises a cutting sub-plate, an extrusion sub-plate and a screw hole, the jig panel is divided into a cutting plate dividing area and an extruding plate dividing area, the cutting plate dividing area and the extruding plate dividing area are each provided with a plurality of sub-plates, and each sub-plate is provided with a plurality of screw holes; the thicknesses of the sub-plates of the cutting sub-plates are increased progressively, the meshing lengths of the screw holes in the sub-plates of the cutting sub-plates are increased progressively, and the number of teeth of the screw holes in each sub-plate is increased progressively. According to the device, the jig panels with different materials and different screw hole diameters are adopted, and the screw holes with different thread numbers and different forming modes are formed in the jig panels, so that the device capable of testing bearable torques of the screw holes with different screw hole forming processes, screw hole materials, friction coefficients and thread number is realized.

Description

Technical Field

[0001] The utility model relates to the field of screw hole torque testing, and specifically, to a device for testing the breaking torque of screw holes. Background Art

[0002] Applying torque to a bolt can obtain a clamping force between two objects. If the clamping force is too small, the fastening effect is poor; if the clamping force is too large, the screw hole is prone to slipping teeth.

[0003] The torque that a screw hole can bear is related to the screw hole forming process, screw hole material, friction coefficient, number of screw threads, etc. Therefore, it is necessary to provide a device and method that can realize the test of the bearable torque of screw holes with different screw hole forming processes, screw hole materials, friction coefficients, and numbers of screw threads.

[0004] The existing patent CN211347178U discloses a torque testing device, and the patent CN103852198A discloses a torque detection device. The above existing patents cannot realize the torque test for different screw hole forming processes, screw hole materials, numbers of screw threads, etc. Summary of the Utility Model

[0005] Aiming at the defects in the prior art, the purpose of the utility model is to provide a device for testing the breaking torque of screw holes.

[0006] According to a device for testing the breaking torque of screw holes provided by the utility model, it includes: a cutting sub-panel, an extrusion sub-panel, and screw holes;

[0007] The fixture panel is divided into a cutting sub-panel area and an extrusion sub-panel area. Both the cutting sub-panel and the extrusion sub-panel are provided with a plurality of sub-boards, and each sub-board is provided with a plurality of screw holes;

[0008] The thicknesses of the multiple sub-boards of the cutting sub-panel increase gradually, the meshing lengths of the screw holes on the multiple sub-boards of the cutting sub-panel increase gradually, and the number of teeth of the screw holes on each sub-board increases gradually.

[0009] Preferably, a spacing groove is arranged between adjacent sub-boards.

[0010] Preferably, a plurality of bottom supports are arranged at the bottom of the fixture panel, and the bottom supports avoid the positions of the screw holes.

[0011] Preferably, a laser marking area is arranged on the side surface of the fixture panel.

[0012] Preferably, the material of the fixture panel includes aluminum alloy, brass, and 45 steel.

[0013] Preferably, the cutting sub-panel and the extrusion sub-panel are integrally formed to constitute the fixture panel, and the multiple sub-boards are integrally formed.

[0014] Preferably, the cutting sub-board includes: a first cutting sub-board, a second cutting sub-board, and a third cutting sub-board;

[0015] The first cutting sub-board, the second cutting sub-board, and the third cutting sub-board are connected in sequence and their thicknesses increase in sequence.

[0016] Preferably, the extrusion sub-board includes: a first extrusion sub-board, a second extrusion sub-board, and a third extrusion sub-board;

[0017] The first extrusion sub-board, the second extrusion sub-board, and the third extrusion sub-board are connected in sequence and their thicknesses increase in sequence.

[0018] Preferably, the multiple screw holes on each sub-board are arranged in an array.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. This application adopts fixture panels of different materials and different screw hole diameters, and sets screw holes with different thread counts and different forming methods on the fixture panel, thereby realizing a device that can test the loadable torque of screw holes with different screw hole forming processes, screw hole materials, friction coefficients, and number of screw threads.

[0021] 2. This application can obtain the actual value of the clamping force under different torque magnitudes through a pressure sensor and a display instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the utility model will become more obvious:

[0023] Figure 1 is a schematic diagram of the overall structure of the test device;

[0024] Figure 2 is a top view of the fixture panel;

[0025] Figure 3 is a cross-sectional view of the fixture panel (A - A);

[0026] Figure 4 is a side view of the fixture panel;

[0027] Figure 5 is a front view of the fixture panel;

[0028] As shown in the figure:

[0029]

[0030] Detailed implementation mode

[0031] The present utility model will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several changes and improvements can still be made. These all belong to the protection scope of the present utility model.

[0032] As Figure 1 shown, this embodiment includes: a fixture panel and a bottom support 6. A plurality of bottom supports 6 are connected to the bottom of the fixture panel. The fixture panel and the bottom support 6 are integrally formed or connected by means of bolts, welding, etc.

[0033] As Figures 2 - 3 shown, the fixture panel is divided into a cutting sub-panel 1 area and an extrusion sub-panel 2 area. Both the cutting sub-panel 1 and the extrusion sub-panel 2 are provided with a plurality of sub-boards. The cutting sub-panel 1 and the extrusion sub-panel 2 are integrally formed or connected to form the fixture panel. The plurality of sub-boards are integrally formed or assembled by means of welding, fitting, etc. A plurality of screw holes 3 are provided on each sub-board, and the plurality of screw holes 3 on each sub-board are arranged in an array; the thickness of the plurality of sub-boards of the cutting sub-panel 1 increases, the meshing length of the screw holes 3 on the plurality of sub-boards of the cutting sub-panel 1 increases, and the number of teeth of the screw holes 3 on each sub-board increases; that is, the number of meshing teeth of each sub-board screw hole 3 increases, which is achieved by changing the meshing length of the screw hole 3, because the thickness of adjacent sub-boards is different, thus realizing different meshing tooth numbers.

[0034] As Figures 4 - 5 shown, an interval groove 5 is provided between adjacent sub-boards. The interval groove 5 can distinguish different sub-boards; the bottom support 6 avoids the position of the screw hole 3, generally set at the position between two sub-boards. A laser marking area 4 is provided on the side of the fixture panel, which can be used for laser marking.

[0035] In one embodiment, the cutting sub-board 1 includes: a first cutting sub-board 11, a second cutting sub-board 12, and a third cutting sub-board 13; the extrusion sub-board 2 includes: a first extrusion sub-board 21, a second extrusion sub-board 22, and a third extrusion sub-board 23; the first cutting sub-board 11, the second cutting sub-board 12, and the third cutting sub-board 13 are arranged in a row and connected in sequence, and the thicknesses of the first cutting sub-board 11, the second cutting sub-board 12, and the third cutting sub-board 13 increase in sequence, so as to achieve that the engagement lengths of the screw holes 3 on the first cutting sub-board 11, the second cutting sub-board 12, and the third cutting sub-board 13 increase in sequence. The first extrusion sub-board 21, the second extrusion sub-board 22, and the third extrusion sub-board 23 are arranged in another row and connected in sequence, and the thicknesses of the first extrusion sub-board 21, the second extrusion sub-board 22, and the third extrusion sub-board 23 increase in sequence, so as to achieve that the engagement lengths of the screw holes 3 on the first extrusion sub-board 21, the second extrusion sub-board 22, and the third extrusion sub-board 23 increase in sequence.

[0036] In one embodiment, 16 screw holes 3 are provided on the first cutting sub-board 11, and the 16 screw holes 3 are arranged in a 4*4 array, and the number of teeth of the 16 screw holes 3 gradually increases.

[0037] In one embodiment, multiple fixture panels are provided, and their materials are aluminum alloy, brass, and 45 steel respectively. Thus, when other conditions remain unchanged, the clamping force and breaking torque of the screw holes 3 of different materials are changed.

[0038] In one embodiment, multiple fixture panels are provided and are provided with screw holes 3 of different diameters, so as to achieve, when other conditions remain unchanged, the changes in the clamping force and breaking torque of the screw holes 3 of different diameters. The measurement of the clamping force at the screw hole 3 can be realized by installing a pressure sensor.

[0039] In one embodiment, the sub-board is set as an independent module and is installed on the cutting sub-board 1 and the extrusion sub-board 2 in a detachable manner. The independent modules of multiple sub-boards are selected according to the changes in the forming methods such as cutting forming or extrusion forming, the changes in the engagement length, the changes in the diameter, and the changes in the selected materials of aluminum alloy, brass, and 45 steel. One of the variables is continuously adjusted while the other variables remain unchanged, and multiple groups of sub-board groups with reference and comparison significance are processed. Among them, the changes in the engagement length and the diameter can also be realized by processing screw holes 3 with different parameters on the same sub-board. The processed sub-board can be directly embedded into the groove reserved on the fixture panel.

[0040] In addition, corresponding daughter boards can also be directly divided on the fixture panel, and corresponding screw holes 3 can be machined on the daughter boards. Considering the convenience of using the fixture panel, one fixture panel can be machined for each group according to the control group with one control variable changed, and multiple fixture panels can be machined. When it is necessary to test the torque with one variable changed and other variables unchanged, only the fixture panel with the corresponding variable changed needs to be found.

[0041] In this embodiment, multiple screw holes 3 are machined on each daughter board of the fixture panel. The screw holes 3 on half of the daughter boards are formed by cutting, and the screw holes 3 on the other half of the daughter boards are formed by extrusion. When the daughter board is embedded, the daughter board formed by cutting can be embedded in the cutting sub-board 1 area, and the daughter board formed by extrusion can be embedded in the extrusion sub-board 2 area. Then, by controlling one of the variables of the diameter, engagement length or material of the screw hole 3 to be changed and keeping the others unchanged, multiple groups of fixture panels or independent modules of multiple groups of daughter boards that can be compared separately according to a certain parameter are machined. Select a specified torque with a torque wrench and drive the bolt into the screw hole 3. Measure the clamping force of the bolt driven into the corresponding screw hole 3 with a pressure sensor in cooperation with a display instrument. Select screw holes 3 with different numbers of teeth, different engagement lengths, different diameters, different forming methods and different materials. After continuing to select a specified torque with a torque wrench and driving the bolt into the screw hole 3, measure the clamping force of the bolt driven into the corresponding screw hole 3 with a pressure sensor, and obtain the change data of the clamping force of the screw hole 3 with the number of teeth, engagement length, diameter, forming method and material.

[0042] By controlling other variables unchanged and changing one of them, this embodiment can obtain the actual value of the clamping force at different torque magnitudes through a pressure sensor and a display instrument; it can also obtain the magnitude difference of the torque that can be borne by screw holes with different forming processes; it can also obtain the magnitude difference of the torque that can be borne by screw holes 3 with different materials; it can also obtain the magnitude difference of the torque that can be borne by screw holes with different mating numbers of teeth.

[0043] The simplified formula of the torque and clamping force for screw locking in this embodiment satisfies that the clamping force F = u1.2T, where T is the locking torque, F is the obtained clamping force, and u is the friction coefficient. When the screw strength > the strength of the screw hole 3, the ultimate failure torque (or ultimate failure clamping force) of the screw hole 3 under different conditions (hole depth, hole diameter, material) can be obtained through the test method of this embodiment. When the screw strength < the strength of the screw hole 3, the situation where the screw is broken but the screw hole 3 is not damaged will occur, and the ultimate failure torque (failure clamping force) of the screw is measured in this case.

[0044] In one implementation manner, during the test, the influence of the thread sealant on the failure torque can also be tested by applying thread sealant in some screw holes 3 and not applying thread sealant in some screw holes 3 while keeping the other parameters unchanged.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0046] The specific embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present utility model. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A screw hole breaking torque test device, characterized in that, Including: Cutting sub-board (1), extrusion sub-board (2) and screw holes (3); The fixture panel is divided into a cutting sub-board (1) area and an extrusion sub-board (2) area. The cutting sub-board (1) and the extrusion sub-board (2) are provided with a plurality of sub-boards, and a plurality of screw holes (3) are provided on each sub-board; The thicknesses of the multiple sub-boards of the cutting sub-board (1) increase, the meshing lengths of the screw holes (3) on the multiple sub-boards of the cutting sub-board (1) increase, and the number of teeth of the screw holes (3) on each sub-board increases.

2. The screw hole destruction torque testing device according to claim 1, wherein: An interval groove (5) is provided between adjacent sub-boards, and a laser marking area (4) is provided on the side surface of the fixture panel.

3. The screw hole breaking torque testing device according to claim 1, wherein: A plurality of bottom supports (6) are provided at the bottom of the fixture panel, and the bottom supports (6) avoid the positions of the screw holes (3).

4. The screw hole breakage torque testing device according to claim 1, wherein: The sub-board is set as an independent module and is installed on the cutting sub-board (1) and the extrusion sub-board (2) in a detachable manner.

5. The screw hole breakage torque testing device according to claim 1, wherein: The material of the sub-board includes aluminum alloy, brass and 45 steel, and thread sealant is applied to some of the screw holes (3) of the sub-board.

6. The screw hole breakage torque testing device according to claim 1, characterized in that: The cutting sub-board (1) and the extrusion sub-board (2) are integrally formed to form the fixture panel, and the multiple sub-boards are integrally formed.

7. The screw hole breakage torque testing device according to claim 1, wherein, The cutting sub-board (1) includes: a first cutting sub-board (11), a second cutting sub-board (12) and a third cutting sub-board (13); The first cutting sub-board (11), the second cutting sub-board (12) and the third cutting sub-board (13) are connected in sequence and the thicknesses increase in sequence.

8. The screw hole breakage torque testing device according to claim 1, wherein The extrusion sub-board (2) includes: a first extrusion sub-board (21), a second extrusion sub-board (22) and a third extrusion sub-board (23); The first extrusion sub-board (21), the second extrusion sub-board (22) and the third extrusion sub-board (23) are connected in sequence and the thicknesses increase in sequence.

9. The screw hole breaking torque testing device according to claim 1, wherein: The multiple screw holes (3) on each sub-board are arranged in an array.

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