Helicopter profile drilling positioning tool

Abstract

The utility model belongs to the helicopter profile manufacturing technology, and relates to a helicopter profile hole-making positioning tool which comprises a guide mechanism and a punch, a through hole is arranged in the guide mechanism, the punch is arranged in the through hole and is in sliding fit with the through hole, an outer guide shaft is arranged at the front end of the guide mechanism, and an inner guide shaft is arranged at the rear end of the outer guide shaft. An inner guide hole is formed in the outer guide shaft, communicated with the through hole and in transition fit with a front guide shaft of the punch, a tip is arranged at the front end of the front guide shaft of the punch, and the outer circle of the outer guide shaft at the front end of the guide mechanism is matched with a positioning hole in the sample plate. According to the utility model, the hole site of the hole formed in the helicopter profile piece can be quickly, efficiently and accurately positioned, and the quality of the hole formed in the helicopter profile piece is improved.

Description

Technical Field

[0001] This utility model relates to helicopter profile manufacturing technology, specifically a tool for positioning holes in helicopter profiles. Background Technology

[0002] Helicopter structural design requires a balance between lightweight and high strength to ensure flight performance and safety. Profiles, with their advantages of light weight, high strength, and good machinability, perfectly meet the structural design needs of helicopters. Therefore, profiles are widely used as primary structural components in critical areas such as the fuselage. As the most commonly used configuration in helicopter structures, profiles come in various cross-sectional shapes and are frequently used in structures such as frame flanges, platform stringers, and reinforcing ribs. The panel reinforcement structure formed by profiles and skin is also the most efficient and widely used structural form in traditional aircraft structural design. Furthermore, profiles are easy to process and connect, which is beneficial for helicopter manufacturing and maintenance.

[0003] Before assembly, the profiles require precise drilling to connect and secure the components using fasteners such as bolts and rivets. The flight performance and structural stability of a helicopter largely depend on the precise assembly of its components. The accuracy of hole positioning directly affects the installation quality of fasteners and the load-bearing capacity of the structure. Therefore, precise hole positioning is crucial for ensuring the integrity and functionality of the helicopter structure. Inaccurate hole positioning can lead to stress concentration at structural joints, increasing the risk of fatigue cracks, shortening the helicopter's service life, and potentially causing structural failure in extreme cases.

[0004] The drilling of helicopter profiles begins with positioning and clamping a drilling or punching template to the profile. A positioning tool then impacts the template along the normal direction of the standard hole, creating punch points on the profile surface. The template is removed, and drilling equipment is used to drill along the punch points. Traditional positioning tools are integrated with the punch head. Because the punch head needs to be designed with a conical surface and a pointed tip, the positioning guide dimensions are reduced. For thinner templates, the positioning tool's guide portion makes less contact with the template, or even no contact at all. This results in insecure positioning each time the tool is inserted into the template's positioning hole, requiring operator adjustment. This process is inefficient, and the positioning tool is prone to shifting under stress during punching, compromising accuracy. Therefore, a more efficient and accurate positioning tool for drilling helicopter profiles is needed. Utility Model Content

[0005] The technical problem solved by this utility model is: addressing the issues of low positioning efficiency and poor positioning accuracy of traditional helicopter profile drilling positioning tools, which lead to unstable drilling quality and potential scrapping, as well as the waste of resources caused by the frequent replacement of the positioning surface of traditional tools due to easy wear. The purpose of this utility model is to provide a helicopter profile drilling positioning tool that can quickly, efficiently and accurately complete the positioning of drilling holes on helicopter profile parts, thereby improving the quality of drilling on helicopter profiles.

[0006] Technical solution of this utility model

[0007] A helicopter profile hole-making and positioning tool includes a guide mechanism 1 and a punch 2. The guide mechanism 1 has a through hole inside, and the punch 2 is disposed in the through hole and slides with the through hole. The front end of the guide mechanism 1 has an outer guide shaft, and the outer guide shaft has an inner guide hole inside. The inner guide hole communicates with the through hole and transitionally engages with the front guide shaft of the punch 2. The front end of the front guide shaft of the punch 2 has a pointed tip, and the outer circle of the outer guide shaft at the front end of the guide mechanism 1 engages with a positioning hole on a template.

[0008] Furthermore, the punch 2 has a three-section stepped structure, including a front guide shaft, a middle guide shaft and a rear guide shaft connected in sequence. The rear guide shaft is clearance-fitted with the through hole inside the guide mechanism 1, and the front guide shaft is transition-fitted with the inner guide hole of the guide mechanism 1. The tip is set at the front end of the front guide shaft.

[0009] Furthermore, the surface of the rear guide shaft is knurled, and the tail end face of the rear guide shaft is flat.

[0010] Furthermore, the outer surface of the guide mechanism 1 is knurled.

[0011] Furthermore, the fit tolerance between the inner guide hole of the guide mechanism 1 and the front guide shaft of the punch 2 is H7 / f8; the fit tolerance between the outer guide shaft of the guide mechanism 1 and the template positioning hole is H7 / h8.

[0012] Furthermore, the surface finish of the inner guide hole wall of the guide mechanism 1 is Ra1.6.

[0013] Furthermore, the surface finish of the outer wall of the front guide shaft of punch 2 is Ra1.6; the tip angle of punch 2 is 60°.

[0014] Furthermore, the punch 2 is made of T8A material with a hardness of HRC50-55 and a bluish surface; the guide mechanism 1 is made of Q235 material with a bluish surface.

[0015] Beneficial effects

[0016] This utility model proposes a positioning tool for drilling holes in helicopter profiles, which has the following advantages:

[0017] 1. The punch part and the positioning guide mechanism of the positioning tool are designed as separate and detachable structures. When using it, the guide mechanism is first positioned with the template and product, and then the punch is inserted. Because the punch head is sharp, the risk of scratching the product by directly inserting the punch is avoided, thus improving the operating efficiency.

[0018] 2. When the punch is subjected to force, the guiding mechanism ensures the direction of the force, preventing the punch from deviating and ensuring the stability of the hole making.

[0019] 3. The punch part and the positioning guide mechanism part of the positioning tool are designed as separate and detachable structures. The same specification punch is used to match the guide mechanism with different positioning sizes. For different samples and products, only the guide mechanism needs to be replaced, thus realizing the modular design and manufacturing of the positioning tool.

[0020] 4. For split positioning tools, the punch and guide mechanism can be made of different materials. The punch can be made of a high-hardness, high-wear-resistant material, while the guide part, which is in direct contact with the product, can be made of a material with a lower hardness than the product material. This improves the wear resistance of the positioning tool, ensures that the tool will not scratch the product, and when one part wears out, only that part needs to be replaced, saving costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly structure of the positioning tool;

[0022] Figure 2 A schematic diagram of the internal assembly structure of the positioning tool;

[0023] Figure 3 This is a schematic diagram of the guiding mechanism;

[0024] Figure 4 This is a schematic diagram of the punch structure. Detailed Implementation

[0025] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific arrangements and methods set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and apparatus without departing from the spirit of this utility model. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring this utility model.

[0026] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] One embodiment of this utility model is as follows:

[0028] See appendix Figure 1-4 This utility model proposes a helicopter profile hole-making positioning tool, including a guide mechanism 1 and a punch 2. The guide mechanism 1 has a through hole inside, and the punch 2 is disposed in the through hole and slides in the through hole. The front end of the guide mechanism 1 has an outer guide shaft, and the outer guide shaft has an inner guide hole inside. The inner guide hole communicates with the through hole and transitionally engages with the front guide shaft of the punch 2. The front end of the front guide shaft of the punch 2 has a pointed tip, and the outer circle of the outer guide shaft at the front end of the guide mechanism 1 engages with the positioning hole on the template.

[0029] like Figure 4 As shown, the punch 2 has a three-section stepped structure, including a front guide shaft, a middle guide shaft and a rear guide shaft connected in sequence. The rear guide shaft is clearance-fitted with the through hole inside the guide mechanism 1, and the front guide shaft is transition-fitted with the inner guide hole of the guide mechanism 1. The tip is set at the front end of the front guide shaft.

[0030] The rear guide shaft has a knurled surface and a flat end face.

[0031] The outer surface of the guide mechanism 1 is knurled.

[0032] Furthermore, the fit tolerance between the inner guide hole of the guide mechanism 1 and the front guide shaft of the punch 2 is H7 / f8; the fit tolerance between the outer guide shaft of the guide mechanism 1 and the template positioning hole is H7 / h8.

[0033] The surface finish of the inner guide hole wall of the guide mechanism 1 is Ra1.6.

[0034] The surface finish of the outer wall of the front guide shaft of punch 2 is Ra1.6; the tip angle of punch 2 is 60°.

[0035] The punch 2 is made of T8A material with a hardness of HRC50-55 and a bluish surface; the guide mechanism 1 is made of Q235 material with a bluish surface. The guide mechanism 1 is selected with different positioning dimensions depending on the template.

[0036] Another embodiment of this utility model is:

[0037] See Figure 1 , Figure 2The helicopter profile hole positioning tool shown mainly includes a guide mechanism 1 and a punch 2. The inner guide hole of the guide mechanism 1 and the guide shaft of the punch 2 are fitted with an transition fit. The tip of the punch 2 is inserted into the guide mechanism along the inner guide hole of the guide mechanism 1, and the tail is fitted with a clearance fit.

[0038] See Figure 3 The guide mechanism 1 of the tool can be designed with different sizes and specifications for positioning with the template, and can be adjusted and replaced according to actual needs. The outer wall of the guide mechanism 1 is designed with a knurled structure for easy gripping.

[0039] See Figure 4 The punch 2 of the tool adopts a stepped structure, with a tapered and sharp front end that leaves clear punch marks on the product surface. The tail shaft of the punch 2 is designed with a knurled structure for easy gripping. The tail of the punch 2 is designed with a flat structure, which distributes the force more evenly when subjected to external impact.

[0040] During operation, first insert the outer guide shaft of the guide mechanism 1 along the normal direction of the template positioning hole to ensure that the front end face of the guide mechanism 1 is in contact with the template surface. Then, insert the tip of the punch 2 axially along the inner guide hole of the guide mechanism 1. The tip of the punch 2 contacts the product surface. Use a hammer to strike the flat surface of the tail of the punch 2 to leave a clear punch mark on the product surface.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A tool for positioning holes in helicopter profiles, characterized in that, The device includes a guide mechanism and a punch. The guide mechanism has a through hole inside, and the punch is disposed in the through hole and slides in the through hole. The front end of the guide mechanism has an outer guide shaft, and the outer guide shaft has an inner guide hole inside. The inner guide hole communicates with the through hole and transitionally engages with the front guide shaft of the punch. The front end of the front guide shaft of the punch has a pointed tip, and the outer circle of the outer guide shaft at the front end of the guide mechanism engages with a positioning hole on a template.

2. The helicopter profile hole-making and positioning tool according to claim 1, characterized in that, The punch has a three-section stepped structure, including a front guide shaft, a middle guide shaft and a rear guide shaft connected in sequence. The rear guide shaft is clearance-fitted with the through hole inside the guide mechanism, and the front guide shaft is transition-fitted with the inner guide hole of the guide mechanism. The tip is located at the front end of the front guide shaft.

3. The helicopter profile hole-making and positioning tool according to claim 2, characterized in that, The rear guide shaft has a knurled surface and a flat end face.

4. The helicopter profile hole-making and positioning tool according to claim 1, characterized in that, The outer surface of the guide mechanism is knurled.

5. The helicopter profile hole-making and positioning tool according to claim 1, characterized in that, The fit tolerance between the inner guide hole of the guide mechanism and the front guide shaft of the punch is H7 / f8; the fit tolerance between the outer guide shaft of the guide mechanism and the template positioning hole is H7 / h8.

6. The helicopter profile hole-making and positioning tool according to claim 1, characterized in that, The surface finish of the inner guide hole wall of the guide mechanism is Ra1.

6.

7. The helicopter profile hole-making and positioning tool according to claim 1, characterized in that, The surface finish of the outer wall of the punch's front guide shaft is Ra1.6; the tip angle of punch 2 is 60°.

8. The helicopter profile hole-making and positioning tool according to claim 1, characterized in that, The punch is made of T8A material with a hardness of HRC50-55 and a bluish surface; the guide mechanism is made of Q235 material with a bluish surface.

Images