Glue joint positioning tool for fixed-pitch blade bushing

Abstract

The invention relates to the technical field of assembly tools for aeronautical manufacturing, in particular to a cementing positioning tool for a fixed-pitch blade bushing, which comprises a positioning base, a plurality of positioning pins, a pressing mechanism and a demolding structure. According to the invention, through the arrangement of the positioning base, the positioning pins which are integrated on the positioning base and have the same reference, and the pressing mechanisms with the unified specification, accurate pre-positioning and rigid fixation of all the metal linings relative to the paddle body in one-time positioning are realized; by using the positioning tool which is compact in structure and standardized in operation process, the problems of one-by-one positioning and easy deviation in a traditional method are solved, the glue joint coaxiality and position accuracy can be remarkably improved, the batch production efficiency is greatly improved, the dependence on the skills of operators is reduced, and the tool can be repeatedly used and is long in service life and low in comprehensive cost.

Description

Technical Field

[0001] This application relates to the field of assembly tooling technology in aircraft manufacturing, and in particular to a bonding and positioning tool for a fixed-pitch propeller bushing. Background Technology

[0002] A tiltrotor aircraft is a type of aircraft that combines the agility of a helicopter with the high speed of a fixed-wing aircraft. One of its core components, the fixed-pitch rotor blades, is typically made of composite materials. The center of each fixed-pitch rotor blade has multiple (usually eight) mounting holes for installing connectors, within which metal bushings are bonded to improve wear resistance and connection strength.

[0003] In existing adhesive bonding processes, positioning and gluing are mainly done manually. However, this method has the following drawbacks: First, manual positioning makes it difficult to guarantee the positional accuracy between multiple bushings and the coaxiality between the bushing and the mounting hole, resulting in low precision and easy displacement of the bushings during the bonding process, affecting the subsequent assembly quality and the dynamic balance performance of the blades; Second, traditional manual adhesive bonding methods often require manual alignment and fixing of each bushing, which is cumbersome, labor-intensive, and difficult to achieve efficient mass production.

[0004] Therefore, there is an urgent need for a simple, precise, and easy-to-operate adhesive bonding positioning tool to improve the bonding quality and production efficiency of metal bushings. Summary of the Invention

[0005] This application provides a bonding and positioning tool for a fixed-pitch blade bushing, which solves the problems of low positioning accuracy, complex operation and low efficiency of traditional bonding methods in the prior art.

[0006] This application provides a bonding and positioning tool for a fixed-pitch blade bushing, including a blade body, wherein the blade body has a plurality of mounting holes for mounting a metal bushing in its central region, and further includes: The positioning base is provided with a positioning structure for cooperating with the central area of ​​the blade body. The positioning structure is also provided with a plurality of positioning through holes, and the plurality of positioning through holes correspond one-to-one with the plurality of mounting holes. Multiple positioning pins are correspondingly disposed in multiple positioning through holes. The blade body is positioned and connected to the positioning base through the positioning pins. The metal bushing is sleeved on the positioning pins. A clamping mechanism is screwed to one end of the positioning pin and is used to clamp and fix the metal bushing sleeved on the positioning pin. A demolding structure is provided at the bottom of the positioning base to eject and separate the blade body from the positioning base after the adhesive has been cured.

[0007] Preferably, the positioning structure is a recessed groove formed on the upper surface of the positioning base, the contour of the recessed groove matches the protruding contour of the central area of ​​the blade body, and a guide slope is also provided around the recessed groove.

[0008] Preferably, the positioning through hole is a round hole, and one end of the positioning pin is fixedly inserted into the interior of the positioning through hole.

[0009] Preferably, the positioning through hole is an irregularly shaped hole, and one end of the positioning pin passes through the mounting hole and can be detachably inserted into the positioning through hole.

[0010] Preferably, the positioning pin is a stepped shaft structure, and the end that is inserted into the positioning through hole is a polygonal structure that is adapted to the positioning through hole; The stepped surface of the locating pin is used to abut against the lower surface of the locating base.

[0011] Preferably, the clamping mechanism includes washers and locking nuts corresponding to the number of positioning pins, and the top of the positioning pin is also provided with an external thread. The locking nut cooperates with the external thread to clamp the metal bushing into the blade body.

[0012] Preferably, the demolding structure includes: The push plate is movably housed in the receiving hole located at the center of the positioning base; The ejector is rotatably mounted on the positioning base, with its top end abutting against the bottom of the push plate. It is used to drive the push plate to make vertical displacement within the receiving hole, thereby pushing the blade body.

[0013] Preferably, the positioning base has an overflow groove at the mating surface corresponding to the metal bushing.

[0014] Preferably, the outer diameter of the locating pin is in clearance fit with the inner diameter of the metal bushing, and the surfaces of the locating base and the locating pin are both provided with wear-resistant coating and / or anti-rust coating.

[0015] This application also provides a bushing bonding method for a bushing bonding and positioning tool based on any of the above-described pitch blade bushings, comprising: The blade body is positioned and installed on the positioning structure of the positioning base, so that each positioning pin passes through the mounting holes opened on the blade body. After applying adhesive to the outer surface of the metal bushing, it is fitted onto the corresponding positioning pin and gradually pushed into the interior of the corresponding mounting hole under the guidance of the positioning pin. Each of the metal bushings is pressed and fixed by a pressing mechanism; The adhesive is cured using a curing device. After curing, the blade body with the glued metal bushing is ejected from the positioning base by operating the demolding structure, thus completing the bonding.

[0016] The beneficial effects of this application are as follows: The bonding positioning tool for fixed-pitch blade bushings disclosed in this application achieves precise pre-positioning and rigid fixation of all metal bushings relative to the blade body in a single positioning operation through a positioning base, a positioning pin with the same reference integrated thereon, and a clamping mechanism of uniform specifications. By using this compact and standardized positioning tool, the problems of individual positioning and easy deviation in traditional methods are solved. It can significantly improve the coaxiality and positional accuracy of bonding, greatly improve batch production efficiency, reduce dependence on operator skills, and the tool is reusable, has a long service life, and low overall cost.

[0017] Furthermore, by introducing replaceable locating pins, a clamping mechanism with torque control, an overflow groove to accommodate overflowing adhesive, and a demolding mechanism for assisting ejection, the tool's adaptability, reliability, ease of use, and maintainability are further enhanced. While being able to cope with more complex process requirements and protect the surface quality of the workpiece, the operation time is further reduced. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A top view of the overall structure of the adhesive positioning tool for the fixed-pitch blade bushing provided in the embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along the AA direction.

[0020] Figure label: 1. Positioning base; 2. Blade body; 3. Positioning pin; 4. Metal bushing; 5. Washer; 6. Locking nut; 7. Push plate; 8. Mold opening screw. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The following is combined with Figure 1 and Figure 2 This describes the adhesive bonding and positioning tool for the fixed-pitch blade bushing provided in the embodiments of this application.

[0023] Reference Figure 1 and Figure 2 As shown, the adhesive positioning tool for the fixed-pitch blade bushing provided in this application embodiment is applied to the blade body 2, which has multiple mounting holes for installing metal bushings 4 in the central area. It mainly includes a positioning base 1, multiple positioning pins 3, a clamping mechanism, and a demolding structure.

[0024] In some specific embodiments, the positioning base 1 is made of stainless steel through precision machining and heat treatment to give it excellent dimensional stability and wear resistance. Its upper surface is machined with a recessed groove that matches the shape of the protrusion in the central area of ​​the blade body 2 as a positioning structure. In this embodiment, the contour of the recessed groove precisely matches the square protrusion in the central area of ​​the blade body 2, and the periphery of the recessed groove is provided with a guide slope to facilitate the quick initial positioning of the blade body 2. The bottom of the groove is machined with eight positioning through holes corresponding to the mounting holes on the blade body 2, with a positional error controlled within 0.02 mm, providing a basic guarantee for subsequent positioning and installation.

[0025] In some specific embodiments, multiple positioning pins 3 are provided, with one end of each pin 3 being detachably or fixedly disposed in a corresponding positioning through hole. In this embodiment, a total of eight positioning pins 3 are provided, and a replaceable quick-connect design is adopted. The positioning pin 3 has a stepped shaft-like structure, with its base made of hard alloy and chrome-plated. Its lower end is a regular hexagonal structure, and a corresponding regular hexagonal positioning through hole is provided on the positioning base 1. The two are slidably fitted to each other to suppress torque and prevent it from rotating circumferentially with the locking nut 6. The middle part is a precision cylindrical section, the diameter of which is clearance-fitted with the inner diameter of the metal bushing 4, with a single-sided clearance of approximately 0.015 mm. A shoulder is formed between its lower end and the middle part. When the positioning pin 3 is inserted into place, the lower end face of the shoulder abuts against the lower surface of the positioning base 1, achieving axial limitation. The top of the positioning pin 3 is also machined with an external thread for screwing the locking nut 6.

[0026] In some specific embodiments, the clamping mechanism includes washers 5 and locking nuts 6 corresponding to the number of locating pins 3. The washers 5 are elastic washers or spherical washers. The locking nuts 6 are tightened with external threads, and the clamping force is evenly transmitted to the outer surface of the blade body 2 through the washers 5, thereby firmly clamping the metal bushing 4 onto the locating base 1 and into the mounting hole. In this embodiment, the clamping mechanism includes eight elastic washers 5 and eight locking nuts 6. During operation, the metal bushing 4 coated with epoxy resin adhesive is placed on the locating pin 3, followed by the placement of the elastic washers 5, then the locking nuts 6 are screwed in. A torque wrench is used to tighten the locking nuts 6 to the specified torque, ensuring that the lower end face of the metal bushing 4 is tightly fitted against the upper surface of the locating base 1 for locking and limiting.

[0027] In some specific embodiments, to prevent the metal bushing 4 from failing to adhere to the surface of the positioning base 1 due to excess adhesive, an excess adhesive groove is provided at the contact surface of the positioning base 1 corresponding to the metal bushing 4. This excess adhesive groove can be an annular groove surrounding the opening of the positioning through hole, or a mesh-like groove extending outwards. Its function is to accommodate any excess adhesive that may overflow, or to guide the overflowing adhesive outwards, so as to avoid obstructing the adhesion between the bottom end of the metal bushing 4 and the surface of the positioning base 1.

[0028] In some specific embodiments, a demolding structure is disposed at the bottom of the positioning base 1 to eject and separate the blade body 2 after adhesive bonding and curing from the positioning base 1. The demolding structure includes a push plate 7 and an ejector. The push plate 7 is movably accommodated in a receiving hole opened at the center of the positioning base 1, and the roughness of its upper and lower surfaces is controlled at Ra1.6 to prevent scratching the blade. The ejector is rotatably disposed on the positioning base 1, with its top end abutting against the bottom of the push plate 7. In this embodiment, the ejector is a demolding screw 8 screwed into the threaded hole at the bottom of the positioning base 1; after curing, after releasing the locking mechanism, the top end of the demolding screw 8 is rotated to push the push plate 7 upward, and the push plate 7 evenly pushes the blade body 2 away from the groove of the positioning base 1, completing the demolding; in other embodiments, a hydraulic push rod or electric push rod device that can be autonomously advanced can also be used to achieve automated demolding.

[0029] In some specific embodiments, this application also provides a bushing bonding method for a bushing bonding and positioning tool based on any of the above-mentioned methods, which specifically includes: Clean all parts and place the push plate 7 into the receiving hole of the positioning base 1; Place the square protrusion of the blade body 2 into the recessed groove of the positioning base 1 along the guide slope, and ensure that it fits completely. After the lower ends of the eight positioning pins 3 pass through the corresponding eight mounting holes in sequence through the blade body 2, they are inserted into the corresponding positioning through holes of the positioning base 1. Apply adhesive evenly to the outer surface of the metal bushing 4; Place the eight metal bushings 4 onto the eight locating pins 3 respectively, and push them to the bottom; Install elastic washers 5 on each positioning pin 3 in sequence, screw in lock nuts 6, adjust the clamping mechanism to clamp and fix each metal bushing 4, and tighten the lock nuts 6 to the specified torque so that one end of the metal bushing 4 is flat against the surface of the positioning base 1, and the other end is clamped by the clamping mechanism. Then, put the entire assembly into an oven or other curing device and cure it according to the corresponding curing parameters. After cooling, loosen and remove all locking nuts 6 and washers 5 in sequence, and then pull out the eight locating pins 3 in sequence. After curing, loosen and remove all locking nuts 6 and washers 5 in sequence. Then, remove the eight locating pins 3 from the locating base 1 in sequence. Drive the push plate 7 to move vertically upward, pushing the square protrusion of the blade body 2, causing it to be lifted out of the recessed groove of the locating base 1, thus completing the bonding. Rotate the mold release screw 8 to drive the push plate 7 to move vertically upward, pushing the square protrusion of the blade body 2 so that it is lifted out of the recessed groove of the positioning base 1, so that the glued blade assembly can be removed and the glued assembly can be completed.

[0030] Specifically, the adhesive bonding and positioning tool for the fixed-pitch blade bushing provided in this application embodiment is used to perform the above-mentioned bushing adhesive bonding method to achieve the desired technical effect, which will not be elaborated here.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A bonding and positioning tool for a fixed-pitch blade bushing, comprising a blade body (2), wherein the blade body (2) has a plurality of mounting holes for mounting a metal bushing (4) in its central region, characterized in that, Also includes: The positioning base (1) is provided with a positioning structure for cooperating with the central area of ​​the blade body (2). The positioning structure is also provided with a plurality of positioning through holes, and the plurality of positioning through holes correspond one-to-one with the plurality of mounting holes. Multiple positioning pins (3) are correspondingly set in multiple positioning through holes. The blade body (2) is positioned and connected to the positioning base (1) through the positioning pins (3). The metal bushing (4) is sleeved on the positioning pins (3). A clamping mechanism is screwed to one end of the positioning pin (3) and is used to clamp and fix the metal bushing (4) sleeved on the positioning pin (3); A demolding structure is provided at the bottom of the positioning base (1) to eject and separate the blade body (2) after adhesive bonding and curing from the positioning base (1).

2. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 1, characterized in that, The positioning structure is a recessed groove on the upper surface of the positioning base (1). The outline of the recessed groove matches the raised outline of the central area of ​​the blade body (2). A guide slope is also provided around the recessed groove.

3. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 2, characterized in that, The positioning through hole is a round hole, and one end of the positioning pin (3) is fixedly inserted into the inside of the positioning through hole.

4. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 2, characterized in that, The positioning through hole is an irregularly shaped hole, and one end of the positioning pin (3) can be detachably inserted into the positioning through hole after passing through the mounting hole.

5. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 4, characterized in that, The positioning pin (3) is a stepped shaft structure, and one end of it that is inserted into the positioning through hole is a polygonal structure that is adapted to the positioning through hole; The stepped surface of the positioning pin (3) is used to abut against the lower surface of the positioning base (1).

6. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 1, characterized in that, The clamping mechanism includes washers (5) and locking nuts (6) corresponding to the number of positioning pins (3). The top of the positioning pin (3) is also provided with external threads. The locking nut (6) cooperates with the external threads to press the metal bushing (4) into the blade body (2).

7. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 1, characterized in that, The demolding structure includes: The push plate (7) is movably housed in the receiving hole located at the center of the positioning base (1); The ejector is rotatably mounted on the positioning base (1), with its top end abutting against the bottom of the push plate (7), and is used to drive the push plate (7) to make vertical displacement within the receiving hole, so as to push the blade body (2).

8. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 1, characterized in that, An overflow groove is provided on the positioning base (1) at the contact surface corresponding to the metal bushing (4).

9. The adhesive bonding and positioning tool for the fixed-pitch blade bushing according to claim 1, characterized in that, The outer diameter of the positioning pin (3) and the inner diameter of the metal bushing (4) are in clearance fit, and the surfaces of the positioning base (1) and the positioning pin (3) are provided with wear-resistant coating and / or anti-rust coating.

10. The bushing bonding method of the bonding and positioning tool for the fixed-pitch blade bushing according to any one of claims 1-9, characterized in that, include: Position the blade body (2) on the positioning structure of the positioning base (1) so that each positioning pin (3) passes through the mounting holes opened on the blade body (2); After applying adhesive to the outer surface of the metal bushing (4), it is fitted onto the corresponding positioning pin (3) and gradually pushed into the interior of the corresponding mounting hole under the guidance of the positioning pin (3); Each of the metal bushings (4) is pressed and fixed by a pressing mechanism; The adhesive is cured using a curing device. After curing, the blade body (2) with the glued metal bushing (4) is ejected from the positioning base (1) by operating the demolding structure, thus completing the gluing.

Images