Slotted lining cold extrusion strengthening hole testing device

Abstract

The utility model relates to a slotted lining cold extrusion strengthening hole test device, which comprises a first tension tool and a second tension tool which can be loaded with force along opposite directions, an extrusion core rod and a test block, and a loading position is formed between the first tension tool and the second tension tool. The extrusion core rod can be placed in the loading position and is loaded with force through the first tension tool and the second tension tool. The test block can be arranged on the extrusion core rod in a sleeving manner, and the test block and the extrusion core rod are configured as follows: when the to-be-tested slotted bushing is arranged on the extrusion core rod in a sleeving manner, the test block can be arranged outside the slotted bushing in a sleeving manner; when the extrusion core rod is not loaded with force through the first tension tool and the second tension tool, the extrusion core rod cannot be separated from the slotted lining sleeved with the test block; and when the extrusion core rod is loaded with force through the first tension tool and the second tension tool, the extrusion core rod can perform cold extrusion on the test block under the action of the force and is separated from the slotted lining sleeved with the test block. The device is simple in structure, and can be used for conveniently carrying out a cold extrusion test on the slotted lining.

Description

TECHNICAL FIELD

[0001] The utility model relates to cold extrusion reinforced hole testing device, especially relate to a kind of slit bushing cold extrusion reinforced hole testing device. BACKGROUND

[0002] In the assembly process of aerospace equipment, a slit bushing part is often used. The slit bushing is usually cylindrical, with an opening slit extending in the axial direction on its circumferential wall, and contains a lubricating layer inside, so that the diameter of the slit bushing can be adjusted for cold extrusion reinforcement of the fastening hole.

[0003] Slit bushing cold extrusion reinforcement technology is the most advanced hole cold extrusion reinforcement process in the world at present. It can improve the fatigue resistance of holes in the structure of the machine body, make up for the knife mark defects of the drilling process, and is one of the most effective measures to improve the service life of the fastener connection structure of the aircraft. Slit bushing cold extrusion reinforcement hole test is an important means to evaluate the quality of slit bushing. Foreign countries have special cold extrusion equipment, and it is widely used in the cold extrusion reinforcement of fastening holes of aircraft. There is no mature cold extrusion equipment or test tool in China, which greatly hinders the development of slit bushing and makes it difficult to meet the demand for the rapid development of the domestic aviation field. Therefore, it is necessary to develop a scientific and reasonable cold extrusion test tool to promote the development of slit bushing. SUMMARY

[0004] The utility model aims at solving the above-mentioned problem, and provides a slit bushing cold extrusion reinforced hole testing device.

[0005] To solve the above-mentioned problem, the utility model provides a slit bushing cold extrusion reinforced hole testing device, characterized in that it comprises:

[0006] The first tension tool can be loaded in the first direction Y;

[0007] The second tension tool can be loaded in the direction opposite to the first direction Y. The second tension tool and the first tension tool form a loading position therebetween;

[0008] The extrusion mandrel can be placed in the loading position and loaded by the first tension tool and the second tension tool;

[0009] The test block can be sleeved on the extrusion mandrel; wherein,

[0010] The test block and the extrusion mandrel are configured to:

[0011] When the slotted bush to be tested is sleeved on the extrusion mandrel, the test block can be sleeved outside the slotted bush, and the extrusion mandrel cannot be pulled out from the slotted bush sleeved with the test block when the extrusion mandrel is not loaded by the first tensile tool and the second tensile tool; when the extrusion mandrel is loaded by the first tensile tool and the second tensile tool, the extrusion mandrel can cold extrude the slotted bush and / or the test block under the action of force and be pulled out from the slotted bush sleeved with the test block.

[0012] Further, the extrusion mandrel is provided with a working section, the test block is provided with a fastening hole in the shape of a through hole, and the sum of the outer diameter of the working section and the thickness of the slotted bush is greater than the inner diameter of the fastening hole.

[0013] Further, the extrusion mandrel is provided with a guide section, the guide section is connected with the working section, and the guide section is gradually reduced in the first direction Y from the end of the working section.

[0014] Further, the sum of the minimum outer diameter of the guide section and the thickness of the slotted bush is not greater than the inner diameter of the fastening hole.

[0015] Further, it further comprises a pressing block, the pressing block is used for being sleeved on the extrusion mandrel to abut against the end of the slotted bush, so as to prevent the slotted bush from being pulled out in the first direction Y under the action of force of the extrusion mandrel.

[0016] Further, the pressing block is provided with an axial hole in the shape of a through hole, and the maximum diameter gap between the axial hole and the extrusion mandrel is 0.1 mm.

[0017] Further, the first tensile tool comprises a first cavity and a first center hole penetrating in the first direction Y, the size of the first cavity in the direction transverse to the first direction Y is greater than the size of the first center hole in the direction transverse to the first direction Y; the second tensile tool comprises a second cavity and a second center hole penetrating in the first direction Y; the size of the second cavity in the direction transverse to the first direction Y is greater than the size of the second center hole in the direction transverse to the first direction Y; the first center hole and the second center hole are spaced relative to each other, and the axial direction thereof is parallel to the first direction Y; the first cavity, the first center hole, the second cavity and the second center hole form the loading position.

[0018] Further, the extrusion mandrel comprises a rod part and a head part, the rod part can freely pass through the first center hole and the second center hole; the head part can be accommodated in the first cavity and cannot pass through the first center hole.

[0019] Furthermore, the rod portion includes an introduction section, a working section, a guide section and a straight rod section in sequence, the straight rod section is located between the guide section and the head, the introduction section is provided with an introduction slope, and the angle between the introduction slope and the first direction Y is an acute angle; the diameters of the introduction section, the guide section and the straight rod section are not greater than the diameter of the working section; the diameter of the working section is smaller than the diameter of the fastening hole.

[0020] Furthermore, the first center hole and the second center hole are strip holes, which pass through one end or both ends of the first tension tooling and the second tension tooling in a second direction perpendicular to the first direction Y, so that the extrusion core rod can be loaded into the loading position along the second direction.

[0021] The beneficial contribution of the present invention is that it effectively solves the above-mentioned problems. The present invention's slotted bushing cold extrusion reinforcement hole test device has a simple structure and is easy to use. It can conveniently perform cold extrusion reinforcement hole tests on slotted bushings, testing the performance of slotted bushings and the fit between slotted bushings and fastening holes. It has strong practicality and should be widely promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structural principle of the utility model.

[0023] Figure 2 It is a schematic diagram of the structural principle of the extrusion core rod.

[0024] Figure identification: first tensile tooling 10, first cavity 11, first center hole 12, second tensile tooling 20, second cavity 21, second center hole 22, extrusion mandrel 30, rod 31, head 32, working section 311, guide section 312, straight rod section 313, introduction section 314, test block 40, loading position 50, slit bushing 60, pressure block 70, axial hole 71. DETAILED DESCRIPTION

[0025] like Figure 1 、 Figure 2 As shown, the following embodiments are further explanations and supplements to the present invention and do not constitute any limitation to the present invention.

[0026] The utility model discloses a slit bushing cold extrusion reinforced hole test device, which comprises a first tension tool 10, a second tension tool 20, an extrusion mandrel 30 and a test block 40. The first tension tool 10 and the second tension tool 20 can be loaded with force F in opposite directions, thereby exerting tension force F on the extrusion mandrel 30. Among them, the first tension tool 10 can be loaded with force F in the first direction Y, and the second tension tool 20 can be loaded with force F in the direction opposite to the first direction Y. To facilitate loading the extrusion mandrel 30, a loading position 50 is formed between the first tension tool 10 and the second tension tool 20. The extrusion mandrel 30 can be placed in the loading position 50 and loaded with force F by the first tension tool 10 and the second tension tool 20. The test block 40 can be sleeved on the extrusion mandrel 30, and the test block 40 and the extrusion mandrel 30 are configured as:

[0027] When the slit bushing 60 to be tested is sleeved on the extrusion mandrel 30, the test block 40 can be sleeved on the slit bushing 60. When the extrusion mandrel 30 is not loaded with force F by the first tension tool 10 and the second tension tool 20, the extrusion mandrel 30 cannot be pulled out of the slit bushing 60 with the test block 40 sleeved thereon. When the extrusion mandrel 30 is loaded with force F by the first tension tool 10 and the second tension tool 20, the extrusion mandrel 30 can cold extrude the slit bushing 60 and / or the test block 40 under the action of force F and be pulled out of the slit bushing 60 with the test block 40 sleeved thereon. Mainly, the extrusion mandrel 30 can cold extrude the test block 40 through the slit bushing 60 under the action of force F, so that the fastening hole of the test block 40 is enlarged to enable the extrusion mandrel 30 to be pulled out of the slit bushing 60 with the test block 40 sleeved thereon.

[0028] The slit bushing 60 to be tested and the test block 40 can be freely sleeved on the extrusion mandrel 30. When the slit bushing 60 and the test block 40 are both sleeved on the extrusion mandrel 30, the test block 40 can be sleeved on the slit bushing 60 under the action of gravity F. Alternatively, the test block 40 can be manually sleeved on the slit bushing 60.

[0029] When the test block 40 and the slit bushing 60 are sleeved together, the extrusion mandrel 30 cannot be pulled out of the test block 40 and the slit bushing 60 without external force F being loaded, or when the size of the force F loaded by the external force F does not reach a certain degree. When the extrusion mandrel 30 is loaded with force F by the first tension tool 10 and the second tension tool 20, the extrusion mandrel 30 can be cold extruded and pulled out of the test block 40 and the slit bushing 60 under the action of force F, thereby completing the cold extrusion test, and completing the test on the slit bushing 60.

[0030] When the extrusion mandrel 30 is pulled out from the test block 40 and the slotted bushing 60, the test block 40 is expanded in diameter under cold extrusion. By checking the diameter of the test block 40, whether the design parameters of the slotted bushing 60 meet the requirements can be checked. After the cold extrusion of the extrusion mandrel 30, whether the slotted bushing 60 is cracked can be checked, so whether the strength and other parameters of the slotted bushing 60 meet the design requirements can be checked.

[0031] Further, the extrusion mandrel 30 comprises a working section 311. The working section 311 is used for cold extrusion. In the embodiment, the working section 311 is a cylindrical section with consistent diameter.

[0032] The test block 40 is provided with a fastening hole, the slotted bushing 60 has a certain thickness, and the sum of the outer diameter of the working section 311 and the thickness of the slotted bushing 60 is greater than the inner diameter of the fastening hole. In this way, when no external force F is loaded or the size of the external force F does not reach a certain degree, the extrusion mandrel 30 cannot be pulled out.

[0033] Further, the extrusion mandrel 30 further comprises a guide section 312. The guide section 312 is adjacent to the working section 311 and is formed by gradually reducing the diameter of the working section 311, so that during the stretching process, the extrusion mandrel 30 passes through the guide section 312 and then passes through the working section 311 to act on the slotted bushing 60 and the test block 40 for cold extrusion.

[0034] The sum of the minimum outer diameter of the guide section 312 and the thickness of the slotted bushing 60 is not greater than the inner diameter of the fastening hole, so that the extrusion mandrel 30 can slide relative to the slotted bushing 60 through the guide section 312.

[0035] In order to facilitate the first tension tool 10 and the second tension tool 20 to load the force F on the extrusion mandrel 30, the first tension tool 10 comprises a first cavity 11 and a first center hole 12 penetrating along the first direction Y, and the second tension tool 20 comprises a second cavity 21 and a second center hole 22 penetrating along the first direction Y.

[0036] The size of the first cavity 11 in the transverse direction of the first direction Y is greater than the size of the first center hole 12 in the transverse direction of the first direction Y, so as to form a limiting stepped hole structure. The shape and size of the first cavity 11 are not limited. The axial direction of the first center hole 12 is parallel to the first direction Y.

[0037] The size of the second cavity 21 in the transverse direction of the first direction Y is greater than the size of the second center hole 22 in the transverse direction of the first direction Y, so as to form a limiting stepped hole structure. The shape and size of the second cavity 21 are not limited. The axial direction of the second center hole 22 is parallel to the first direction Y.

[0038] The first center hole 12 and the second center hole 22 are opposite to each other, and the central axes of the two coincide.

[0039] The first cavity 11 and the second cavity 21 are respectively located on the two sides of the first center hole 12 and the second center hole 22.

[0040] The first center hole 12, the second center hole 22, the first cavity 11 and the second cavity 21 form the loading position 50 for loading the extrusion mandrel 30.

[0041] In order to facilitate the loading of the extrusion mandrel 30 into the loading position 50, the first center hole 12 and the second center hole 22 are strip-shaped holes which pass through one end or both ends of the first tension tool 10 and the second tension tool 20 in the second direction perpendicular to the first direction Y, so that the extrusion mandrel 30 can be loaded into the loading position 50 along the second direction.

[0042] In the embodiment, the width of the first center hole 12 and the second center hole 22, that is, the size in the third direction perpendicular to the first direction Y and the second direction, is about 0.2mm larger than the outer diameter of the working section 311.

[0043] Further, the extrusion mandrel 30 comprises a rod part 31 and a head part 32. The rod part 31 and the head part 32 are integrally formed or fixedly connected. In the embodiment, the rod part 31 and the head part 32 are integrally formed.

[0044] The rod part 31 is a long rod which can freely pass through the first center hole 12 and the second center hole 22. The head part 32 can be accommodated in the first cavity 11 and cannot pass through the first center hole 12, so as to be positioned and loaded in the first cavity 11.

[0045] The rod part 31 is provided with the working section 311 and a guide section 312. The guide section 312 is located between the working section 311 and the head part 32.

[0046] Further, the rod part 31 can further comprise a straight rod section 313. The straight rod section 313 is arranged between the guide section 312 and the head part 32. The diameter of the straight rod section 313 is consistent with the minimum diameter of the guide section 312.

[0047] Further, the rod part 31 can further comprise a lead-in section 314 arranged at the end of the rod part 31 opposite to the head part 32. The lead-in section 314 is provided with a lead-in slope, and the included angle between the lead-in slope and the first direction Y is an acute angle α, which is used for guiding and facilitating the sleeving of the slotted bushing 60 and the test block 40 onto the rod part 31.

[0048] The lengths of the working section 311, the guide section 312, the lead-in section 314 and the straight rod section 313 can be set according to requirements. In the embodiment, the length of the straight rod section 313 is greater than the length of the guide section 312, the length of the guide section 312 is greater than the length of the lead-in section 314, and the length of the lead-in section 314 is greater than the length of the working section 311.

[0049] Further, to prevent the slotted bushing 60 from being pulled out in the first direction Y, for example, from the first center hole 12 in the test process under the force F of the extrusion mandrel 30, the slotted bushing cold extrusion hole strengthening test device of the utility model further comprises a pressing block 70.

[0050] The pressing block 70 is used for sleeving the extrusion mandrel 30 and abutting against the end of the slotted bushing 60. The pressing block 70 can prevent the slotted bushing 60 from being pulled out in the first direction Y under the force F of the extrusion mandrel 30. When the slotted bushing 60 and the pressing block 70 are both sleeved on the extrusion mandrel 30, the pressing block 70 is located between the slotted bushing 60 and the head 32, which can play an axial blocking role and can avoid hindering the rotation of the slotted bushing 60 to a certain extent.

[0051] The pressing block 70 is particularly suitable for the slotted bushing with a flange.

[0052] The pressing block 70 is provided with an axial hole 71 in the shape of a through hole. In the embodiment, the maximum diameter gap between the axial hole 71 and the extrusion mandrel 30 is 0.1 MM.

[0053] The material of the pressing block 70 is not limited, and high-strength steel material can be selected.

[0054] When the slotted bushing cold extrusion hole strengthening test device of the utility model is used, the following steps can be referred to:

[0055] 1. The first tension tool 10 and the second tension tool 20 are respectively installed at fixed positions of a test machine. The test machine is a known device, which can load a force F in the direction opposite to the force F in the direction parallel to the first direction Y on the first tension tool 10 and the second tension tool 20;

[0056] 2. The pressing block 70, the slotted bushing 60 to be tested and the test block 40 are sequentially sleeved on the lead-in section 314 of the extrusion mandrel 30 to the rod portion 31 of the extrusion mandrel 30, so that the test block 40 is sleeved on the slotted bushing 60; at this time, the pressing block 70 is in contact with the head 32;

[0057] 3. Adjust the distance between the pressing block 70 and the head 32, so that the extrusion mandrel 30, the pressing block 70, the slotted bushing 60 and the test block 40 can be loaded into the loading position 50 as a whole in the second direction, and the head 32 of the extrusion mandrel 30 is located in the first cavity 11, and the pressing block 70, the slotted bushing 60 and the test block 40 are located in the second cavity 21;

[0058] 4. Then start the test machine, load the first tensile tool 10 and the second tensile tool 20 with opposite forces F to perform stretching, so that the extrusion mandrel 30 passes through the test block 40 containing the slotted bushing 60. In this process, the extrusion mandrel 30 gradually moves relative to the slotted bushing 60 and the pressing block 70 in the first direction Y under the action of the force F, and the slotted bushing 60 is pressed against the pressing block 70; because the diameter of the working section 311 is larger, the extrusion mandrel 30 cold extrudes the slotted bushing 60 and the test block 40 through the working section 311, the fastening hole of the test block 40 is thus enlarged, and the working section 311 of the extrusion mandrel 30 can be withdrawn from the slotted bushing 60 in which the test block 40 is sleeved;

[0059] 5. After the extrusion mandrel 30 is completely withdrawn from the pressing block 70, the cold extrusion test is completed.

[0060] Through the above experimental steps, if the slotted bushing 60 meets the requirements, the extrusion mandrel 30 can be withdrawn from the pressing block 70, and no cracks are found on the slotted bushing 60 and the fastening hole diameter of the test block 40 meets the requirements.

[0061] Although the utility model is disclosed through the above embodiment, the scope of the utility model is not limited thereto, and each component can be replaced by similar or equivalent elements understood by those skilled in the art without deviating from the concept of the utility model.

Claims

1. A slotted bushing cold expansion hole strengthening test device, characterized by, It comprises: a first tension tool (10) capable of being loaded with force in a first direction Y; a second tension tool (20) capable of being loaded with force in a direction opposite to the first direction Y; a loading position (50) is formed between the second tension tool (20) and the first tension tool (10); a pressing mandrel (30) capable of being placed in the loading position (50) and loaded with force by the first tension tool (10) and the second tension tool (20); a test block (40) capable of being sleeved on the pressing mandrel (30); wherein, the test block (40) and the pressing mandrel (30) are configured so that: when a slotted bushing (60) to be tested is sleeved on the pressing mandrel (30), the test block (40) can be sleeved outside the slotted bushing (60), and the pressing mandrel (30) cannot be pulled out from the slotted bushing (60) sleeved with the test block (40) when the pressing mandrel (30) is not loaded with force by the first tension tool (10) and the second tension tool (20); when the pressing mandrel (30) is loaded with force by the first tension tool (10) and the second tension tool (20), the pressing mandrel (30) can cold extrude the slotted bushing (60) and / or the test block (40) and pull out from the slotted bushing (60) sleeved with the test block (40) under the action of force.

2. The slotted bushing cold expansion reinforcement hole test device of claim 1, wherein, The pressing mandrel (30) is provided with a working section (311), the test block (40) is provided with a fastening hole in the form of a through hole, and the sum of the outer diameter of the working section (311) and the thickness of the slotted bushing (60) is greater than the inner diameter of the fastening hole.

3. The slotted bushing cold expansion reinforcement hole test device of claim 2, wherein, The pressing mandrel (30) is provided with a guide section (312), the guide section (312) is connected with the working section (311), and the guide section (312) is gradually reduced from the end of the working section (311) in the first direction Y.

4. The slotted bushing cold expansion reinforcement hole test device of claim 3, wherein, The sum of the minimum outer diameter of the guide section (312) and the thickness of the slotted bushing (60) is not greater than the inner diameter of the fastening hole.

5. The slotted bushing cold expansion reinforcement hole test device of claim 1, wherein, It further comprises a pressing block (70) for sleeving on the pressing mandrel (30) and abutting against the end of the slotted bushing (60) to prevent the slotted bushing (60) from being pulled out in the first direction Y under the action of force of the pressing mandrel (30).

6. The slotted bushing cold expansion reinforcement hole test device of claim 5, wherein, The pressing block (70) is provided with an axle hole (71) in the form of a through hole, and the maximum diameter gap between the axle hole (71) and the pressing mandrel (30) is 0.1 mm.

7. The slotted bushing cold extrusion hole test device of claim 2, wherein: the first tension tool (10) comprises a first cavity (11) and a first center hole (12) penetrating in the first direction Y, and the size of the first cavity (11) in a direction transverse to the first direction Y is greater than the size of the first center hole (12) in a direction transverse to the first direction Y. The second tensile tool (20) comprises a second cavity (21) and a second center hole (22) penetrating along the first direction Y; the size of the second cavity (21) in the direction transverse to the first direction Y is greater than the size of the second center hole (22) in the direction transverse to the first direction Y; The first center hole (12) and the second center hole (22) are spaced relative to each other and their axial directions are parallel to the first direction Y; The first cavity (11), the first center hole (12), the second cavity (21), and the second center hole (22) form the loading position (50).

8. The slotted bushing cold expansion reinforcement hole test device of claim 7, wherein, The extrusion mandrel (30) comprises a rod part (31) and a head part (32), the rod part (31) can freely pass through the first center hole (12) and the second center hole (22); the head part (32) can be accommodated in the first cavity (11) and cannot pass through the first center hole (12).

9. The slotted liner cold expansion reinforced hole test device of claim 8, wherein, The rod part (31) comprises a lead-in section (314), a working section (311), a guide section (312), and a straight rod section (313) in sequence, the straight rod section (313) is located between the guide section (312) and the head part (32), the lead-in section (314) is provided with a lead-in slope, and the included angle between the lead-in slope and the first direction Y is an acute angle; The diameters of the lead-in section (314), the guide section (312), and the straight rod section (313) are all not greater than the diameter of the working section (311); The diameter of the working section (311) is smaller than the diameter of the fastening hole.

10. The slotted bushing cold expansion reinforcement hole test device of claim 7, wherein, The first center hole (12) and the second center hole (22) are strip-shaped holes, one end or both ends of which penetrate the first tensile tool (10) and the second tensile tool (20) in a second direction perpendicular to the first direction Y, so that the extrusion mandrel (30) can be loaded into the loading position (50) along the second direction.

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