Reverse nail pressing device

Abstract

The utility model belongs to the field of aeronautical manufacturing technology / aircraft fuselage structure assembly, and relates to a reverse nail pressing device. Comprising a main body, a pressing block, a force transmission screw rod and a rotating rod, the device is designed according to the principle of acting force and counter-acting force in mechanics, and has the advantages that the high-locking bolt at the part with insufficient construction space is convenient and quick to mount, and a series of problems that the high-locking bolt is difficult to mount by adopting the acting force of a riveter or a hammer, and the surface of a part and the head of the bolt are easily damaged are solved; the bolt mounting efficiency can be improved, the product quality is guaranteed, and the production and assembly period is shortened.

Description

Technical Field

[0001] The utility model belongs to the field of aviation manufacturing technology / aircraft fuselage structure assembly, and relates to a reverse nail pressing device. A reverse nail pressing device for installing interference-fit Hi-Lok bolts in narrow spaces during the aircraft structure assembly stage. Background Art

[0002] Most critical structural parts of aircraft are connected by Hi-Lok bolts. The Hi-Lok bolt uses the interference fit caused by the interference amount of the bolt and the nut and the combined effect of a relatively high pre-tightening force to improve the fatigue strength of the product structure. The installation process of Hi-Lok bolts is: pre-assembly of parts → hole making → chamfering or rounding → disassembly → deburring → cleaning → re-fixing → preparation of fasteners → installation → painting (generally no setting force is required, and for double hexagon Hi-Lok nuts, they can be tightened again with setting force as needed after installation).

[0003] When installing Hi-Lok bolts in relatively open parts of the structure, the hammering force of the riveting gun punch can be used on the copper rod to drive the Hi-Lok bolt along the hole axis direction, and then subsequent installation work can be carried out.

[0004] However, during the aircraft structure assembly process, there are often parts restricted by assembly characteristics such as product structure and construction space. It is very difficult to drive the Hi-Lok bolts in by relying on the impact force of the riveting gun and hammer. If the operation is slightly improper, it is easy to damage the surface of the parts of the product structure and the head of the Hi-Lok bolt, directly causing defects in the quality of the aircraft product and multiple rework and troubleshooting, and not meeting the installation technical requirements of Hi-Lok bolts. In order to ensure high-quality and high-efficiency connection of Hi-Lok bolts in the aircraft structure, this set of reverse nail pressing device is invented. This device is convenient and fast to use, can not only greatly improve the installation efficiency of Hi-Lok bolts, but also ensure the installation quality of Hi-Lok bolts. Summary of the Utility Model

[0005] Purpose of the Utility Model

[0006] The utility model overcomes the deficiencies in the prior art, and designs and provides a reverse nail pressing device for aircraft structure assembly in view of the problems existing in the above prior art. Its purpose is to use this device to solve the problem of difficult installation of interference-fit Hi-Lok bolts in narrow construction passage parts, so as to avoid disadvantages such as defects in the quality of aircraft products and multiple rework and troubleshooting caused by improper operation, improve the installation efficiency of Hi-Lok bolts, and ensure the stable and reliable quality of products.

[0007] Technical Solution

[0008] A reverse pressing nail device, comprising a main body a, a pressing block b, a force transmission screw d, and a rotating rod e; the main body a is of a U-shaped structure, and one end of the U-shaped structure is provided with a force transmission screw d through thread fit. One end of the force transmission screw d is formed into a ball head, which is inserted into the spherical socket of the pressing block b and connected by caulking to ensure that the ball head part of the force transmission screw d does not fall off and can rotate flexibly in the spherical socket of the pressing block b. The pressing block b is attached to the surface of the part through the working surface, and it is ensured that the threaded part of the Hi-Lok bolt can extend into the guiding hole of the pressing block b. The rotating rod e passes through the end hole of the force transmission screw d.

[0009] Further, it further comprises a stop rod c. One end of the stop rod c is connected to the pressing block b by interference fit, and the other end abuts against a part of the main body a to ensure that the pressing block b does not rotate together with the force transmission screw d during work, preventing the pressing block b from rotating and scratching the surface of the part.

[0010] Further, both ends of the rotating rod e are flattened for feeding to ensure that the rotating rod does not fall off during work.

[0011] Further, the other end of the U-shaped structure is provided with a boss, and the boss presses the Hi-Lok bolt into the bolt hole formed on the product.

[0012] Further, the main body a is made of cast iron material.

[0013] Further, the pressing block b is made of steel material.

[0014] Further, the surface roughness Ra of the working surfaces of the main body a and the pressing block b is ≤1.6 μm. The beneficial effects of this application are as follows:

[0015] The utility model provides an installation method for an interference-fit Hi-Lok bolt in aircraft structure assembly. It designs this device by utilizing the principle of action and reaction in mechanics. The advantages are that it is convenient and fast to install Hi-Lok bolts in parts with insufficient construction space, avoiding a series of problems such as difficulties in installing Hi-Lok bolts using a riveting gun or a hammer and easy damage to the surface of the part and the head of the bolt, improving the installation efficiency of the bolt, ensuring product quality, and shortening the production and assembly cycle. Brief Description of the Drawings

[0016] Figure 1 It is a two-dimensional view of the device of the utility model;

[0017] Figure 2 It is a schematic diagram of the use of the device of the utility model.

[0018] Wherein: a is the main body, b is the pressing block, c is the stop rod, d is the force transmission screw, and e is the rotating rod. Detailed Embodiment

[0019] The present utility model will be further described below in conjunction with embodiments. The following only describes a part of the embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0020] The reverse press stud device for aircraft structure assembly is characterized in that the device of the present utility model is divided into five parts: a is the main body part of the reverse press stud device for aircraft structure assembly, and the main body part is a U-shaped metal body, which is the main body part of the device; b is the pressing block, and the pressing block is a conical metal body, which is used for pressing and guiding the bolt; c is the stop rod, and the stop rod is a linear metal body, which is used for guiding the pressing block; d is the force transmission screw, and the force transmission screw is a threaded metal body, and the pressing block presses the bolt into the bolt hole through threaded locking; e is the rotating rod, and the rotating rod is a linear metal body, which is used for the tightening operation of the force transmission screw. The main body part a mainly bears the main force transmission part of the device, and the reaction A surface on this part is used to press against the head of the high-lock bolt. The pressing block part b mainly fits with the surface of the part through the acting surface B, and ensures that the threaded part of the high-lock bolt extends into the hole of the pressing block. The stop rod part c is connected with the pressing block b by interference fit, and the other end leans against the main body part a to ensure that the pressing block b does not rotate with the screw d during work, preventing the pressing block b from rotating and scratching the surface of the part. The screw part d uses trapezoidal threads with large force transmission. The screw part passes through the threaded hole of the main body part a to play a role in force transmission. One end of it is made into a ball head shape and inserted into the spherical socket of the pressing block b, and is connected by the processing method of necking to ensure that the ball head part of the screw does not fall off and can rotate flexibly in the spherical socket of the pressing block. The rotating rod part e passes through the end hole of the screw d, and the two ends of the rotating rod are flattened by feeding to ensure that the rotating rod does not fall off during work. Rotating this rod can make the screw d move axially, and then drive the pressing block b to work.

[0021] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments:

[0022] See the attached Figure 1 、 2 As shown, the device of the present utility model is divided into five parts: a is the main body part of the reverse press stud device for aircraft structure assembly, b is the pressing block, c is the stop rod, d is the force transmission screw, and e is the rotating rod. The whole device is made of steel material, and the surface roughness Ra of the two acting surfaces A and B is ≤1.6 μm to avoid scratches caused by friction when contacting the part and the head of the high-lock bolt. After each part of the device is processed, it is treated by quenching and tempering (quenching + high-temperature tempering) to make the device have good comprehensive mechanical properties and meet its service performance requirements.

[0023] The specific operation process is as follows:

[0024] ① Manufacture the device in the present utility model.

[0025] ② Stick two layers of adhesive tapes on the two acting surfaces A and B of the device respectively to prevent the surface of the part and the head of the Hi-Lok bolt from being bruised.

[0026] ③ Attach the reaction surface A on the a main body part to the head of the Hi-Lok bolt, align the hole on the b presser with the threaded rod of the bolt. Rotate the e rotating rod clockwise to make the acting surface B of the b pressing block fit with the surface of the part, and at the same time limit the c shift lever on the a main body.

[0027] ④ Apply force evenly and rotate the e rotating rod clockwise to make the Hi-Lok bolt rod enter the bolt hole evenly until the head of the Hi-Lok bolt fits with the surface of the part.

[0028] ⑤ Rotate the e rotating rod counterclockwise to remove the reverse press stud, and complete the press stud step.

[0029] ⑥ Screw the Hi-Lok nut onto the thread of the Hi-Lok bolt (generally screw on two threads), pre-tighten the Hi-Lok bolt with a ratchet wrench or a special pneumatic wrench. When the pre-tightening time reaches the requirements of the technical specification, cut off the hexagon head on the Hi-Lok nut to complete the installation of the Hi-Lok bolt.

[0030] Those skilled in the art of this technology can understand that unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the art in the field to which the present utility model belongs. It should also be understood that terms defined in general dictionaries should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as here. The specific embodiments described above have further elaborated on the purpose, technical solution and beneficial effects of the present utility model. It should be understood that the above is only the specific embodiment of the present utility model and is not used to limit the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A reverse nail pressing device, characterized in that, It includes a main body, a pressing block, a force transmission screw rod, and a rotating rod; the main body is of a U-shaped structure, and one end of the U-shaped structure is provided with a force transmission screw rod through threaded fit. One end of the force transmission screw rod is made into a ball head, which is inserted into the spherical socket of the pressing block and connected by a necking method to ensure that the ball head part of the force transmission screw rod does not fall off and can rotate flexibly in the spherical socket of the pressing block. The pressing block fits with the surface of the part through the working surface, and it is ensured that the threaded part of the high-lock bolt can extend into the guiding hole of the pressing block. The rotating rod passes through the end hole of the force transmission screw rod.

2. The device according to claim 1, characterized in that, It further includes a stop rod. One end of the stop rod is connected to the pressing block by interference fit, and the other end leans against the main body part to ensure that the pressing block does not rotate together with the force transmission screw rod during work and prevent the pressing block from rotating and scratching the surface of the part.

3. The device according to claim 2, characterized in that, Both ends of the rotating rod are flattened by knocking to ensure that the rotating rod does not fall off during the working process.

4. The device according to claim 3, wherein The other end of the U-shaped structure is provided with a boss, and the boss presses the high-lock bolt into the bolt hole formed on the product.

5. The device according to claim 4, characterized in that, The main body is made of cast iron material.

6. The device according to claim 5, characterized in that, The pressing block is made of steel material.

7. The device according to claim 6, characterized in that, The surface roughness Ra of the working surfaces of the main body and the pressing block is ≤1.6 μm.

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