Assembling and testing device and assembling and testing method for bushing

Abstract

The invention relates to the technical field of cold extrusion assembly, in particular to an assembly testing device and an assembly testing method of a bushing. The assembling and testing device for the bushing comprises a cold extrusion mechanism, a clamp and a core rod, wherein the cold extrusion mechanism is provided with a clamping station. The clamp is separably arranged at the clamping station. The core rod comprises a spindle and a pressure head, the pressure head is arranged at one end of the spindle, the maximum diameter of the pressure head is larger than that of the spindle, and the other end of the spindle movably penetrates into the clamp and is in transmission connection with the cold extrusion mechanism. The cold extrusion mechanism is configured to drive the main shaft to move in the axial direction so as to drive the pressing head to penetrate through the lining, and therefore the lining is pressed into the structure connecting hole. The clamp is arranged at a clamping station of the cold extrusion mechanism, and the cold extrusion mechanism drives the main shaft to move in the axial direction so as to drive the pressing head to penetrate through the lining, so that the lining is pressed into the structural connecting hole. According to the assembling and testing device for the lining, the lining matched with the carbon fiber plate is selected, and the lining is pressed into the structural connecting hole of the carbon fiber plate, so that the product yield of the carbon fiber plate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cold extrusion assembly, in particular to a bushing assembly testing device and a bushing assembly testing method. BACKGROUND

[0002] In the aviation manufacturing industry, mechanical connection is still the main connection method of aircraft structural parts, and the structural connection hole of the structural part is an important factor determining the fatigue performance. The structural connection hole of the aviation material (such as aluminum alloy, titanium alloy) is pressed and assembled with a bushing in the hole by using a cold extrusion strengthening process to improve the fatigue life of the structural part.

[0003] However, as a new type of aviation material, the mechanical properties and microstructure of the carbon fiber plate are different from those of the conventional aviation metal material. The selection of the bushing of the carbon fiber plate is mostly based on the selection rules of the bushing of the conventional aviation metal material, which leads to the fact that when the selected bushing (with different extrusion amounts) is pressed and assembled in the structural connection hole of the carbon fiber plate by using the cold extrusion method, the bushing with a larger extrusion amount is easy to cause cracks, delamination failure and other quality defects of the carbon fiber plate, thereby increasing the product failure rate of the carbon fiber plate. SUMMARY

[0004] The purpose of the present application is to provide a bushing assembly testing device and a bushing assembly testing method, so as to realize the rapid assembly of the carbon fiber plate and the bushing with different wall thicknesses and select the bushing suitable for the carbon fiber plate, thereby improving the product yield of the carbon fiber plate after cold extrusion strengthening.

[0005] To achieve this purpose, the technical solution adopted by the present application is as follows:

[0006] The bushing assembly testing device is used for pressing and assembling a bushing in a structural connection hole of a carbon fiber plate, and the bushing assembly testing device comprises:

[0007] A cold extrusion mechanism having a clamping station;

[0008] A clamp, which is detachably arranged in the clamping station;

[0009] A core rod, which comprises a main shaft and a pressure head, one end of the main shaft is provided with the pressure head, the maximum diameter of the pressure head is greater than the diameter of the main shaft, and the other end of the main shaft is movably arranged in the clamp and is drivingly connected with the cold extrusion mechanism; the cold extrusion mechanism is configured to drive the main shaft to move in the axial direction to drive the pressure head to pass through the bushing, so as to press and assemble the bushing in the structural connection hole.

[0010] As an optional solution, the pressure head comprises a first conical section and a pressure ring section, the small-diameter end of the first conical section is connected with the main shaft, the large-diameter end of the first conical section is connected with one end of the pressure ring section in the axial direction, and the diameter of the pressure ring section is greater than the diameter of the main shaft.

[0011] As an option, the pressure head further comprises a second conical section, the first conical section and the second conical section are respectively arranged at two axial ends of the pressure ring section, and a large-diameter end of the second conical section is connected to the other axial end of the pressure ring section.

[0012] As an option, the clamp comprises:

[0013] A clamping frame is detachably arranged at the clamping station;

[0014] A guide sleeve is arranged at the clamping frame, and a distal end of the main shaft from the pressure head is movably arranged in the guide sleeve.

[0015] As an option, the guide sleeve is axially provided with a first hole and a second hole in communication, a distal end of the first hole from the second hole penetrates an axial end of the guide sleeve, and an inner diameter of the first hole is greater than an inner diameter of the second hole;

[0016] The clamp further comprises a pull rod, one end of the pull rod is connected to an output end of the cold extrusion mechanism, the other end of the pull rod is movably arranged in the first hole, and the main shaft movably passes through the second hole and the first hole and is fixedly connected with the pull rod.

[0017] As an option, the guide sleeve is further provided with a third hole in the axial direction, one end of the third hole is coaxially communicated with the second hole, the other end of the third hole penetrates the other axial end of the guide sleeve, and a slotted washer for the main shaft to pass through is arranged in the third hole.

[0018] As an option, the assembly and test device of the bushing further comprises:

[0019] A gasket is provided with a through hole for the main shaft to pass through, the carbon fiber plate can be stacked below the gasket, and the through hole is coaxially arranged with the structure connecting hole;

[0020] A locking clamp is configured to lock the stacked gasket and carbon fiber plate.

[0021] A method for assembling and testing a bushing, comprising the following steps:

[0022] Preparation of a carbon fiber plate with a structure connecting hole and a bushing with different wall thicknesses;

[0023] The bushings with different thicknesses are sleeved in the structure connecting holes of the corresponding carbon fiber plates;

[0024] The bushings are press-fitted into the corresponding structure connecting holes by the above-mentioned assembly and test device of the bushing.

[0025] As an option, the inner wall of the bushing is coated with a solid lubricant before the bushing is press fitted.

[0026] As an option, the carbon fiber plate after the bushing is press fitted is detected for cracks or delamination failure, and the wall thickness of the bushing in the carbon fiber plate without cracks or delamination failure is recorded.

[0027] The present application has the following advantages:

[0028] The bushing assembly testing device provided by the present application is arranged at the clamping station of the cold extrusion mechanism, and the bushing is placed in the structural connecting hole of the carbon fiber plate. The main shaft of the cold extrusion mechanism is driven to move axially to drive the pressure head to pass through the bushing, so as to press fit the bushing in the structural connecting hole. The bushing assembly testing device can quickly press fit bushings with different wall thicknesses in the structural connecting hole of the carbon fiber plate by the cold extrusion method, and detect whether the carbon fiber plate after cold extrusion strengthening has defects such as cracks and delamination failure, so as to select a bushing suitable for the carbon fiber plate, thereby improving the product yield of the carbon fiber plate after cold extrusion strengthening.

[0029] The bushing assembly testing method provided by the present application can quickly press fit bushings with different wall thicknesses in the structural connecting hole of the carbon fiber plate by the cold extrusion method through the bushing assembly testing device, and detect whether the carbon fiber plate after cold extrusion strengthening has defects such as cracks and delamination failure, so as to select a bushing suitable for the carbon fiber plate, thereby improving the product yield of the carbon fiber plate after cold extrusion strengthening. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a top view of a carbon fiber plate provided with a bushing according to an embodiment of the present application;

[0031] Figure 2 is a sectional view of a bushing assembly testing device when the bushing is press fitted according to an embodiment of the present application;

[0032] Figure 3 is a structural schematic view of a mandrel according to an embodiment of the present application;

[0033] Figure 4 is a main flowchart of a bushing assembly testing method according to an embodiment of the present application.

[0034] Names and numbers of components in the figures are as follows:

[0035] 100, carbon fiber plate; 101, structural connecting hole; 200, bushing;

[0036] 1, clamp; 11, clamping frame; 12, guide sleeve; 121, first hole; 122, second hole; 123, third hole; 13, split washer; 14, pull rod; 15, gasket; 151, through hole; 16, locking clamp; 2, mandrel; 21, main shaft; 22, press head; 221, first conical section; 222, press ring section; 223, second conical section. DETAILED DESCRIPTION

[0037] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described here are only used to explain the present application, but not limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, not all.

[0038] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the present embodiment, the terms "upper", "lower", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0041] The technical solutions of the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0042] Embodiment One

[0043] As a new type of aviation material, the mechanical properties and microstructure of the carbon fiber plate are different from those of conventional aviation metal materials. The bushing in the structural connecting hole of the carbon fiber plate is mostly selected according to the selection rules of the bushing of the conventional aviation metal material, which leads to that the bushing (with different extrusion amounts) selected by the cold extrusion method is pressed into the structural connecting hole of the carbon fiber plate. The bushing with a larger extrusion amount is easy to cause the carbon fiber plate to crack, delaminate and fail, etc., thereby increasing the defective rate of the carbon fiber plate product.

[0044] To solve the above problems, as shown in Figure 1 and Figure 2 The embodiment provides an assembly and test device of a bushing for pressing the bushing 200 into the structural connecting hole 101 of the carbon fiber plate 100. Specifically, the assembly and test device of the bushing comprises a cold extrusion mechanism, a clamp 1 and a core rod 2. The cold extrusion mechanism has a clamping station. The clamp 1 is detachably arranged in the clamping station. The core rod 2 comprises a main shaft 21 and a pressure head 22. One end of the main shaft 21 is provided with the pressure head 22. The maximum diameter of the pressure head 22 is greater than the diameter of the main shaft 21. The other end of the main shaft 21 is movably arranged in the clamp 1 and is drivingly connected with the cold extrusion mechanism. The cold extrusion mechanism is configured to drive the main shaft 21 to move axially to drive the pressure head 22 to pass through the bushing 200, so as to press the bushing 200 into the structural connecting hole 101. The clamp 1 is arranged in the clamping station of the cold extrusion mechanism. The cold extrusion mechanism drives the main shaft 21 to move axially to drive the pressure head 22 to pass through the bushing 200, so as to press the bushing 200 into the structural connecting hole 101. The assembly and test device of the bushing can press the bushing 200 with different wall thicknesses into the structural connecting hole 101 of the carbon fiber plate 100 by the cold extrusion method, so as to select the bushing 200 suitable for the carbon fiber plate 100 according to whether the carbon fiber plate 100 after cold extrusion strengthening appears the defects of cracking, delamination and failure, etc., so as to improve the product yield of the carbon fiber plate 100 after cold extrusion strengthening. The cold extrusion mechanism described above is prior art, and the structure and working process of the cold extrusion mechanism will not be described again.

[0045] It should be noted that, as Figure 1As shown, the carbon fiber plate 100 is provided with a structure connecting hole 101, and the bushing 200 with different wall thickness is press-fitted in the structure connecting hole 101 through a cold extrusion process, so as to perform a cold extrusion strengthening process on the structure connecting hole 101 with the bushing 200, and improve the fatigue life of the carbon fiber plate 100 (structure connecting hole 101). The structure connecting hole 101 of the carbon fiber plate 100 is a primary hole, and the structure connecting hole 101 of the carbon fiber plate 100 (the inner hole of the bushing 200) after the press-fitting of the bushing 200 is a required assembly hole. In addition, under the premise that the primary hole and the assembly hole remain unchanged respectively, the required extrusion force and the relative extrusion amount of the bushing 200 with different wall thicknesses are different during the press-fitting process, and the greater the wall thickness, the greater the relative extrusion amount (extrusion force), so as to ensure that the size of the assembly hole obtained after the press-fitting of the bushing 200 remains consistent. Moreover, under the premise that the carbon fiber plate 100 after the cold extrusion strengthening does not appear cracks and delamination failure, the bushing 200 with a relatively large extrusion amount is selected as much as possible, so as to improve the strengthening effect and the fatigue life of the structure connecting hole 101 as much as possible.

[0046] Based on the mechanical properties and microstructure characteristics of the composite material (carbon fiber plate 100 in this embodiment) laminated plate, under the premise that the primary hole and the assembly hole of the carbon fiber plate 100 remain unchanged respectively, the bushing assembly test device is used to press-fit the bushing 200 with different wall thicknesses in the structure connecting hole 101 of the carbon fiber plate 100 through a cold extrusion process, and according to whether the carbon fiber plate 100 after the press-fitting appears cracks and delamination failure defects, the bushing 200 suitable for the carbon fiber plate 100 with the primary hole and the assembly hole with specific sizes is selected.

[0047] The bushing assembly test device can quickly and effectively perform the cold extrusion strengthening process of the carbon fiber plate 100, and can also be connected with a test equipment (such as a force reading mechanism, a universal testing machine, etc.), so as to measure related experimental data (such as the tension applied to the mandrel 2 by the cold extrusion mechanism, etc.). Moreover, the bushing 200 of this embodiment is made of titanium alloy material, which can not only enhance the fatigue life of the structure connecting hole 101, but also protect the carbon fiber plate 100, so as to prevent the structure connecting hole 101 from being pressed by a fastener during assembly under load.

[0048] As shown in Figure 2 The clamp 1 includes a clamping frame 11 and a guide sleeve 12. The clamping frame 11 is detachably arranged at a clamping station. The guide sleeve 12 is arranged in the clamping frame 11, and the end of the main shaft 21 away from the pressure head 22 is movably arranged in the guide sleeve 12. Specifically, the clamping frame 11 is a rectangular frame, and the guide sleeve 12 is arranged in the clamping frame 11 along the direction of the arrow A. Figure 2The bottom of the clamping frame 11 can be installed on a clamping station of a cold extrusion mechanism in the up-down direction, the guide sleeve 12 is threadedly installed on the clamping frame 11, the main shaft 21 of the mandrel 2 is movably arranged in the guide sleeve 12, so that the cold extrusion mechanism pulls the mandrel 2 from bottom to top, the bottom of the guide sleeve 12 is provided with the carbon fiber plate 100, and the structure connecting hole 101 of the carbon fiber plate 100 is arranged to be extruded with the bushing 200. When the mandrel 2 moves axially relative to the clamp 1 from bottom to top, the pressure head 22 passes through the inner hole of the bushing 200 to press the bushing 200 into the structure connecting hole 101 in a cold extrusion manner.

[0049] Specifically, the first hole 121 and the second hole 122 are coaxially and continuously arranged in the guide sleeve 12 in the axial direction, one end of the first hole 121 away from the second hole 122 penetrates one end of the guide sleeve 12 in the axial direction, and the inner diameter of the first hole 121 is larger than that of the second hole 122. The clamp 1 further comprises a pull rod 14, one end of the pull rod 14 is connected with the output end of the cold extrusion mechanism, and the other end of the pull rod 14 is movably arranged in the first hole 121. The main shaft 21 passes through the second hole 122 and is fixedly connected with the pull rod 14. Specifically, the first hole 121 and the second hole 122 are coaxially and continuously arranged and form a stepped hole. Since the inner diameter of the first hole 121 is larger than that of the second hole 122, a stepped surface is formed between the first hole 121 and the second hole 122, which limits the pull rod 14 in the up-down direction and prevents the pull rod 14 from sliding out of the guide sleeve 12. The outer periphery of the end of the main shaft 21 away from the pressure head 22 is provided with external threads to be threadedly connected with the pull rod 14, thereby stably connecting the mandrel 2 with the pull rod 14. The mandrel 2 is connected with the output end of the cold extrusion mechanism through the pull rod 14, which facilitates the disassembly and replacement of the mandrel 2. Moreover, the main shaft 21 and the second hole 122 are slidably connected, thereby guiding and limiting the axial movement of the mandrel 2.

[0050] As shown in Figure 2 The assembly and test device of the bushing further comprises a gasket 15 and a locking clamp 16. The gasket 15 is provided with a through hole 151 through which the main shaft 21 passes. The carbon fiber plate 100 can be stacked below the gasket 15, and the through hole 151 is coaxially arranged with the structure connecting hole 101. The locking clamp 16 is configured to lock the stacked gasket 15 and carbon fiber plate 100. The gasket 15 supports the carbon fiber plate 100, preventing the carbon fiber plate 100 from bending during the pressing of the bushing 200. The locking clamp 16 locks the stacked carbon fiber plate 100 and gasket 15, preventing the carbon fiber plate 100 and the gasket 15 from sliding relative to each other, thereby ensuring the coaxiality of the through hole 151 and the structure connecting hole 101, allowing the pressure head 22 of the mandrel 2 to pass smoothly, and improving the stability of the pressing process of the bushing 200. The locking clamp 16 of the present embodiment can be a locking member such as a clamp, which can only lock the stacked carbon fiber plate 100 and gasket 15.

[0051] Specifically, first, the carbon fiber plate 100 with the bushing 200 is placed under the gasket, then the fiber plate and the gasket 15 are locked by two locking clamps 16, and finally the main shaft 21 of the mandrel 2 is inserted into the guide sleeve 12 and screwed with the pull rod 14 after passing through the bushing 200 and the through hole 151. It should be noted that the maximum diameter of the pressure head 22 is greater than the inner hole of the bushing 200, so that the locked carbon fiber plate 100 and the gasket 15 can be clamped between the guide sleeve 12 and the pressure head 22. When it is necessary to press the bushing 200, the locked carbon fiber plate 100 and the gasket 15 can be tightly pressed against the bottom end of the guide sleeve 12 by hand or other supporting tools.

[0052] Further, the third hole 123 is provided in the guide sleeve 12 along the axial direction, one end of the third hole 123 is coaxially communicated with the second hole 122, and the other end of the third hole 123 penetrates the other end of the guide sleeve 12 along the axial direction, and the slotted washer 13 is provided in the third hole 123 for the main shaft 21 to pass through. Specifically, the inner diameter of the slotted washer 13 is substantially equal to the diameter of the main shaft 21. By setting the slotted washer 13 (unclosed washer), the movement of the mandrel 2 in the up-down direction is guided, and at the same time, the pressure head 22 continues to extend into the slotted washer 13 along the axial direction from the inner hole of the bushing 200 after passing through the inner hole of the bushing 200. At this time, the gap of the slotted washer 13 is enlarged, avoiding the sudden jamming of the mandrel 2 after passing through the bushing 200.

[0053] As shown in Figure 2 and Figure 3 , the pressure head 22 includes a first conical section 221 and a pressure ring section 222, the small-diameter end of the first conical section 221 is connected with the main shaft 21, the large-diameter end of the first conical section 221 is connected with the axial one end of the pressure ring section 222, and the diameter of the pressure ring section 222 is greater than the diameter of the main shaft 21. Specifically, the minimum diameter of the first conical section 221 is equal to the outer diameter of the main shaft 21, and the maximum diameter of the first conical section 221 is equal to the pressure ring section 222. When the bushing 200 is pressed, the first conical section 221 first enters the inner hole of the bushing 200 to finish the inner hole of the bushing 200. Subsequently, the pressure ring section 222 enters the inner hole of the bushing 200 and directly effectively extrudes the bushing 200, so as to press the bushing 200 into the structural connecting hole 101.

[0054] Further, the pressing head 22 further comprises a second conical section 223, the first conical section 221 and the second conical section 223 are respectively arranged at two axial ends of the pressing ring section 222, and a large-diameter end of the second conical section 223 is connected with the other axial end of the pressing ring section 222. Since the bushing 200 will rebound after being extruded by the pressing ring section 222, by arranging the second conical section 223, the rebound process of the inner hole of the extruded bushing 200 can be stabilized and buffered, so as to avoid that the excessive rebound of the bushing 200 causes the size error of the assembly hole to be too large, improve the pressing effect of the bushing 200, and be beneficial to improve the product yield of the carbon fiber plate 100 after cold extrusion strengthening.

[0055] Embodiment Two

[0056] As shown in Figure 4 the embodiment, the embodiment provides an assembly test method of a bushing, and the assembly test method of the bushing comprises the following steps:

[0057] A carbon fiber plate 100 with a structure connecting hole 101 and a bushing 200 with different wall thicknesses are prepared.

[0058] The bushing 200 with different thicknesses is sleeved in the structure connecting hole 101 of the corresponding carbon fiber plate 100.

[0059] The bushing 200 is pressed into the corresponding structure connecting hole 101 by the assembly test device of the bushing in the embodiment one.

[0060] By the assembly test device of the bushing, the bushing 200 with different wall thicknesses can be pressed into the structure connecting hole 101 of the carbon fiber plate 100 by cold extrusion, so that the bushing 200 suitable for the carbon fiber plate 100 is selected according to whether the carbon fiber plate 100 after cold extrusion strengthening has defects such as cracks and delamination failure, so as to improve the product yield of the carbon fiber plate 100 after cold extrusion strengthening. In addition, by selecting the suitable bushing 200 through the assembly test method of the bushing, the fatigue life of the structure connecting hole 101 of the carbon fiber plate 100 is improved, so as to prolong the service life of the carbon fiber plate 100.

[0061] Specifically, when the carbon fiber plate 100 with the structure connecting hole 101 is prepared, three steps of sample cutting, sample trimming and sample drilling are mainly included. The qualified carbon fiber plate 100 is obtained through the two steps of sample cutting and sample trimming, and then sample drilling is performed on the carbon fiber plate 100 to obtain the structure connecting hole 101 with a set size. Finally, a plurality of bushings 200 with a set wall thickness are prepared. Since the above preparation processes are prior art, they will not be described here.

[0062] It should be noted that the diameter D of the pressing ring section 222 of the mandrel 2 also needs to be selected, the diameter of the assembly hole of the carbon fiber plate 100 is defined as Df, the initial hole diameter of the carbon fiber plate 100 is D0, the rebound amount of the bushing 200 is h, and the relative extrusion amount of the bushing 200 is Er, then:

[0063]

[0064] The diameter Df of the assembly hole is set according to production requirements (or given by design drawings), and the extrusion amount Er is given by the test design. The rebound amount h of the bushing 200 is a parameter related to the test process. After selecting the extrusion amount Er, only the rebound amount h of the bushing 200 is accurately known, the initial hole diameter D0 that basically meets the assembly requirements can be determined. The rebound amount h of the existing test process can be obtained by actual test measurement, and the initial hole diameter D0 is determined accordingly.

[0065] It should also be noted that the relationship between the diameter D of the pressing ring section 222 of the mandrel 2, the initial hole diameter D0, the relative extrusion amount Er, and the wall thickness T of the bushing 200 is:

[0066] D = D0(1 + Er) - 2T

[0067] Therefore, the diameter of the pressing ring section 222 of the mandrel 2 can be calculated from the diameter of the assembly hole, the initial diameter, the relative extrusion amount, and the wall thickness of the bushing 200.

[0068] It should be noted that before the bushing 200 is pressed, the inner wall of the bushing 200 is coated with a solid lubricant. MoS2 solid lubricant is coated on the inner hole wall of the bushing 200, and then the bushing 200 is pushed into the structural connection hole 101 of the carbon fiber plate 100. By spraying the solid lubricant, the pressing ring section 222 of the mandrel 2 can smoothly extrude the bushing 200, avoiding the mandrel 2 from being stuck in the inner hole of the bushing 200, and improving the stability and reliability of the bushing 200 pressing process.

[0069] Further, whether the carbon fiber plate 100 appears cracks or delamination failure after the bushing 200 is pressed is detected, and the wall thickness of the bushing 200 in the carbon fiber plate 100 without cracks or delamination failure is recorded. After different thicknesses of bushings 200 are pressed into the structural connection holes 101 of corresponding carbon fiber plates 100 by different relative extrusion amounts, whether the carbon fiber plate 100 appears cracks or delamination failure is observed, and the qualified carbon fiber plate 100 and the unqualified carbon fiber plate 100 are divided, and then the maximum thickness of the bushing 200 in the qualified carbon fiber plate 100 is selected, so as to guide the subsequent cold extrusion strengthening process of the carbon fiber plate 100.

[0070] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. Bushing assembly test device, characterized in that, The assembly and testing device for the bushing (200) is used to press-fit the bushing (200) into the structural connection hole (101) of the carbon fiber plate (100), and the bushing comprises: Cold extrusion mechanism with clamping station; A clamp (1), wherein the clamp (1) is detachably arranged at the clamping station; A core rod (2), the core rod (2) comprising a main shaft (21) and a pressing head (22), one end of the main shaft (21) being provided with the pressing head (22), the maximum diameter of the pressing head (22) being larger than the diameter of the main shaft (21), the other end of the main shaft (21) being movably inserted into the fixture (1) and being transmission-connected to the cold extrusion mechanism; the cold extrusion mechanism being configured to drive the main shaft (21) to move axially so as to drive the pressing head (22) to pass through the bushing (200), thereby press-fitting the bushing (200) into the structural connection hole (101).

2. The bushing assembly test device according to claim 1, characterized in that: The pressure head (22) comprises a first conical section (221) and a pressure ring section (222), wherein the small diameter end of the first conical section (221) is connected to the main shaft (21), and the large diameter end of the first conical section (221) is connected to one axial end of the pressure ring section (222), and the diameter of the pressure ring section (222) is greater than the diameter of the main shaft (21).

3. The bushing assembly test device according to claim 2, characterized in that: The pressure head (22) also includes a second conical section (223), the first conical section (221) and the second conical section (223) are respectively arranged at the two axial ends of the pressure ring section (222), and the large diameter end of the second conical section (223) is connected to the other axial end of the pressure ring section (222).

4. The bushing assembly and testing device according to claim 1, characterized in that: The clamp (1) comprises: A clamping frame (11), wherein the clamping frame (11) is detachably arranged at the clamping station; A guide sleeve (12) is arranged on the clamping frame (11); an end of the main shaft (21) away from the pressing head (22) is movably inserted into the guide sleeve (12).

5. The bushing assembly test device according to claim 4, characterized in that: A first hole (121) and a second hole (122) are provided in the guide sleeve (12) in an axial direction, wherein an end of the first hole (121) away from the second hole (122) passes through an axial end of the guide sleeve (12), and an inner diameter of the first hole (121) is greater than an inner diameter of the second hole (122); The clamp (1) also includes a pull rod (14), one end of which is connected to the output end of the cold extrusion mechanism, and the other end of which is movably inserted into the first hole (121); the main shaft (21) is movably inserted into the second hole (122) and the first hole (121) and is fixedly connected to the pull rod (14).

6. The bushing assembly test device according to claim 5, characterized in that: A third hole (123) is further provided in the guide sleeve (12) along the axial direction, one end of the third hole (123) is coaxially connected to the second hole (122), and the other end of the third hole (123) passes through the other axial end of the guide sleeve (12), and a slit washer (13) for the main shaft (21) to pass through is provided in the third hole (123).

7. The bushing assembly test device according to any one of claims 1 to 6, characterized in that: The assembly test device of the bushing also includes: A gasket (15), the gasket (15) being provided with a through hole (151) for the main shaft (21) to pass through, the carbon fiber plate (100) being capable of being stacked below the gasket (15), the through hole (151) being coaxially arranged with the structural connection hole (101); A locking clamp (16) is configured to lock the stacked spacers (15) and the carbon fiber plate (100).

8. Bushing assembly test method, characterized in that, The steps include: Prepare a carbon fiber plate (100) with structural connection holes (101) and bushings (200) with different wall thicknesses; The bushings (200) of different thicknesses are sleeved into the corresponding structural connection holes (101) of the carbon fiber plates (100); The bushing (200) is press-fitted into the corresponding structural connection hole (101) by using the bushing assembly test device according to any one of claims 1 to 7.

9. The bushing assembly and testing method according to claim 8, characterized in that: Before the bushing (200) is press-fitted, the inner wall of the bushing (200) is coated with a solid lubricant.

10. The bushing assembly and testing method according to claim 8, characterized in that: The carbon fiber plate (100) after the bushing (200) is press-fitted is detected to determine whether cracks or delamination failure occur, and the wall thickness of the bushing (200) in the carbon fiber plate (100) without cracks or delamination failure is recorded.

Images