Bonding type corner piece assembly for aerospace, mounting method and corner piece forming die

Abstract

The invention discloses a bonding type corner piece assembly for aerospace, a mounting method and a corner piece forming mold, and belongs to the technical field of aerospace fastening. The corner piece assembly comprises a corner piece and a self-locking nut, the corner piece comprises a bonding part and a nut mounting part, the bonding part is used for being connected with a machine body, and the nut mounting part is used for mounting and positioning the self-locking nut; the self-locking nut comprises a nut body, a tail section connecting part and a head section locking part are arranged at the two ends of the nut body respectively, locking threads are arranged on the head section locking part, a mounting hole is formed in the mounting part, and the free end of the tail section connecting part penetrates through the mounting hole and is turned outwards to be assembled with the corner piece. The corner piece assembly can be bonded with the machine body, riveting holes do not need to be prefabricated in the machine body, materials of the machine body cannot be damaged, installation is convenient, the installation efficiency of the assembly, parts and the like is greatly improved, the requirement for the installation space is not high, and the corner piece assembly can be installed in a limited space which is not suitable for riveting or welding.

Description

Technical Field

[0001] The invention relates to an adhesive corner piece component for aerospace, an installation method and a corner piece forming die, belonging to the technical field of aerospace fastening. Background Art

[0002] The pallet nut is one of the most widely used fasteners in the aerospace field. In the process of assembling aircraft parts, due to the setting of the assembly process and the limited installation space, fasteners such as the pallet nut are needed in the process of assembling a large number of parts. In the case of closed and insufficient installation space such as the wing movable surface and maintenance cover, the pallet nut can be pre-installed on the blind surface of the fuselage to facilitate the single-sided installation of subsequent bolts and nuts.

[0003] At present, the commonly used support plate nuts are mostly made of metal materials. Rivets or blind rivets are usually used to rivet double-ear or single-ear support plate nuts on the blind surface of the fuselage. When using riveted support plate nuts, it is necessary to pre-make rivet holes on the fuselage for riveting. The rivet holes will reduce the strength and fatigue performance of the fuselage. In addition, in order to meet the requirements of aerospace weight reduction, the fuselage will be made of carbon fiber composite materials. When rivets are used for riveting, the impact of the rivet gun will cause the carbon fiber composite material structure of the fuselage to be damaged by delamination. Therefore, riveted support plate nuts are not suitable for composite materials on aircraft. For narrow spaces such as right-angle turns on the fuselage, the positioning support of the cable needs to be achieved through the cooperation of fasteners. This limited space makes it impossible to rivet or weld parts or cable positioning parts. In addition, when installing rivets for such support plate nuts, the installation efficiency is low, and the noise during the riveting process is also very large, which has a great impact on the operator. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an adhesive corner piece assembly, an installation method and a corner piece forming die for aerospace.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: an adhesive angle piece assembly for aerospace, comprising an angle piece and a self-locking nut arranged on the angle piece, the angle piece comprising an adhesive portion and a nut mounting portion, the adhesive portion is used for connecting the angle piece with a body, and the nut mounting portion is used for mounting and positioning the self-locking nut on the angle piece; The self-locking nut comprises a nut body, the interior of the nut body is hollow, one end of the nut body is provided with a tail section connecting portion, the other end is provided with a head section locking portion, the head section locking portion is provided with a locking thread, the nut mounting portion is provided with a mounting hole, the free end of the tail section connecting portion passes through the mounting hole and is turned outward to be assembled with the angle piece; The nut body is also provided with an anti-rotation structure, the angle piece is provided with an anti-rotation platform, and the anti-rotation platform is provided with a positioning slot hole matched with the anti-rotation structure.

[0006] The beneficial effects of the present invention are as follows: the aerospace adhesive corner piece assembly can be bonded to the fuselage through the adhesive portion, there is no need to prefabricate rivet holes on the fuselage, and the fuselage material will not be damaged. The fuselage can be made of lightweight composite materials, which is easy to install, greatly improving the installation efficiency of the corner piece assembly, and improving the positioning efficiency of parts, cables, etc., and the installation space requirements are not high, and it can be installed in a limited space that is not suitable for riveting or welding. The installation process will not generate noise such as riveting or welding, which greatly improves the operator's working environment.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the overall shape of the head section locking portion is a frustoconical structure, the interior of the head section locking portion is provided with an internal thread, and the head section locking portion includes a plurality of locking plates, and notches are provided between adjacent locking plates.

[0009] The beneficial effect of adopting the above further scheme is that the slotted cone-shaped structure of the self-locking nut compresses its threaded hole into a circle with a slightly smaller diameter. When the thread of the locking part is screwed with the bolt, it is squeezed by the bolt thread and returns to its original shape, so that the nut produces elastic deformation and elastic deformation force. Due to the interference of the elastic deformation force on the bolt thread, a friction torque that prevents rotation is generated, that is, the locking torque of the self-locking nut, and finally an anti-loosening performance is formed. Due to the excellent elasticity of the slotted cone-shaped structure, its locking life is significantly improved, and the number of uses of the traditional all-metal self-locking nut can be increased from 15 times to 50 times.

[0010] Furthermore, the corner pieces are made of non-metallic materials.

[0011] The beneficial effect of adopting the above further scheme is that the corner piece adopts non-metallic material, which not only replaces the riveted support plate nut of traditional metal material to meet the performance requirements, but also greatly achieves the purpose of weight reduction, and the weight reduction ratio can reach more than 70%.

[0012] Furthermore, the angle piece has an L-shaped structure, and the bonding portion and the nut mounting portion are arranged perpendicularly.

[0013] The beneficial effect of adopting the above further scheme is that the internal structure of the aircraft is complex and has a large number of composite materials. The traditional metal double-ear or single-ear support plate nuts are all linear structures, and their fixing surface is perpendicular to the center line of the nut. When installing, it is necessary to pre-make rivet holes on the fuselage. When using rivets for riveting, the impact of the rivet gun will cause damage such as delamination of the composite material structure. Due to the limitations of structural space and fuselage materials, many positions on the aircraft cannot use traditional support plate nuts. The angle piece has an L-shaped structure, and the fixing surface of the angle piece is parallel to the center line of the nut. It can be used in some specific spaces and specific positions, such as relatively closed spaces where tools such as rivet guns cannot be used, or some right-angle connections.

[0014] Furthermore, at least one reinforcing rib plate is provided between the bonding portion and the nut mounting portion.

[0015] The beneficial effect of adopting the above further solution is that the supporting strength of the corner piece is further increased by reinforcing the rib plate.

[0016] Furthermore, a tail tooth-shaped structure is provided on the outer peripheral surface of the tail section connecting portion.

[0017] The beneficial effect of adopting the above-mentioned further scheme is that the self-locking nut is assembled with the angle piece through external pressure, and the tail tooth structure and the angle piece mounting hole are interference fit. When pressed in, the tail tooth structure is embedded in the inside of the angle piece mounting hole to form an effect similar to "gear meshing", which greatly increases the ability of the self-locking nut to withstand the unscrewing torque, avoids the installation slippage problem that often occurs in the early stage of aircraft assembly site, and improves installation efficiency and quality.

[0018] Furthermore, the bonding portion is a circular structure.

[0019] The beneficial effect of adopting the above further solution is that square or other structures are prone to stress concentration during the load-bearing process, which reduces the service life; the circular structure can avoid stress concentration and increase the bonding contact area, thereby enhancing the bonding force. When the circular structure is processed in the forming mold, there are no "sharp corners" or "vertical corners", and conventional tools can be used to process it in place, without the need to use electrode discharge to clear the corners, saving costs.

[0020] Furthermore, the anti-rotation structure is a hexagonal anti-rotation structure, and the positioning slot is a hexagonal slot.

[0021] The beneficial effect of adopting the above further solution is that it can prevent the self-locking nut from rotating and ensure that the self-locking thread is stably positioned on the angle piece. The present invention also discloses a method for installing an adhesive corner piece assembly for aerospace, the steps of which are as follows: 1) Prepare angle pieces and self-locking nuts; 2) Assembly: The tail end of the self-locking nut passes through the mounting hole of the angle piece and is flanged, and the anti-rotation structure of the self-locking nut is inserted into the positioning slot of the angle piece; 3) Adhere the adhesive portion of the corner piece to the machine body.

[0022] The beneficial effects of the present invention are as follows: the back of the self-locking nut and the angle piece are assembled by flanging, thereby ensuring the push-out force of the angle piece assembly; the aerospace adhesive angle piece assembly can be directly bonded to the fuselage, and the operation is convenient and quick, without the need for prefabricated rivet holes, without damaging the fuselage material, and can greatly improve the installation efficiency.

[0023] Furthermore, the method also includes step 4), using auxiliary mounting parts to assist in the bonding of the corner piece; the auxiliary mounting parts include an arch frame and a pressing frame arranged on the arch frame, the arch frame spans the bonding portion of the corner piece, the arch frame is connected to the machine body through a film, and the two sides of the pressing frame are respectively connected to the arch frame through elastic supports, and under the action of the elastic supports, the pressing frame has an initial position and a downward pressing position, and the pressing frame can keep acting on the bonding portion of the corner piece when in the downward pressing position.

[0024] The beneficial effect of adopting the above further solution is that the bonding of traditional products is completely done manually, which is inefficient and the quality consistency is not controlled. In this installation method, a special auxiliary installation piece is used to assist the installation of the corner piece. After the corner piece is fixed, it is only necessary to press down the clamping frame of the auxiliary installation piece to maintain it. Compared with the manual method, the installation efficiency and quality consistency of the corner piece assembly can be qualitatively improved.

[0025] The present invention also discloses a corner piece forming die, wherein the corner piece is a corner piece of the above-mentioned adhesive corner piece assembly for aerospace, and the forming die comprises a fixed die frame, a fixed die core, a slider, an inclined guide column, a movable die frame, a movable die core, an ejector plate guide column, a spring, a die leg, an ejector, an ejector plate and an ejector push plate; The fixed mold core is arranged on the fixed mold frame, and the movable mold core is arranged on the movable mold frame. The fixed mold core and the movable mold core are combined to form a cavity for forming the corner piece. A filling nozzle is arranged on the fixed mold frame, and the filling nozzle is connected with the cavity through a filling channel. The fixed mold frame is provided with a fixed frame column hole for positioning the inclined guide column, the sliding block is provided with a block column hole for the rod portion of the inclined guide column to pass through, and the movable mold frame is provided with a movable frame slot hole for accommodating the rod end of the inclined guide column; The fixed mold frame is also provided with a shovel base, and the movable mold frame is also provided with a limit block for limiting the outward position of the slider. The slider is slidably arranged on the movable mold frame and is located between the movable mold core and the limit block. The inner side surface of the shovel base is provided with an inclined surface acting on the slider, and the inclination angle of the inclined surface is consistent with the inclination angle of the inclined guide column. The ejector plate is connected to the ejector push plate, the movable mold frame is provided with an ejector hole, one end of the ejector is connected to the ejector plate, and the other end passes through the ejector hole and is connected to the movable mold core, the ejector plate is also provided with an ejector plate guide column, the outer side of the ejector plate guide column is sleeved with a spring, and the spring is located between the movable mold frame and the ejector plate; The movable mold frame is arranged on a bottom plate through mold legs, and a push rod hole is arranged on the bottom plate.

[0026] The beneficial effects of the present invention are as follows: corner pieces can be precisely formed by the forming mold, the forming mold can select the appropriate number of sliders as needed, and can have multiple cavities in one mold, so that multiple corner piece products can be formed simultaneously in a single mold opening and closing process. Compared with traditional machining, the production efficiency of corner pieces is greatly improved, and it is more suitable for mass production of corner pieces.

[0027] Furthermore, the filling channel includes a vertical runner, a transverse runner and a branch runner corresponding to the cavity, the inlet of the vertical runner is connected to the filling nozzle, the outlet of the vertical runner is connected to the inlet of the transverse runner, the branch runner has a conical structure, the outlet of the transverse runner is connected to the inlet of the branch runner, and the outlet end of the branch runner forms a necking gate connected to the cavity.

[0028] The beneficial effect of adopting the above further scheme is that the molten material is injected into the mold cavity through the runner and the "necked" gate, which increases the pouring pressure and makes the corner piece product more full and defect-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the corner piece assembly of the present invention; Figure 2 It is a structural schematic diagram of the corner piece of the present invention; Figure 3 It is a structural schematic diagram of the self-locking nut of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the corner piece assembly of the present invention; Figure 5 This is a structural schematic diagram of the corner piece assembly of the present invention in a cable positioning state; Figure 6 This is a structural schematic diagram of the corner piece assembly of the present invention in installation state 1; Figure 7 It is a structural schematic diagram of the auxiliary mounting member of the present invention; Figure 8 It is a schematic cross-sectional structure diagram of the pressing frame of the present invention in the initial position; Fig. 9 It is a schematic cross-sectional structure diagram of the pressing frame of the present invention in the downward pressing position; Fig.10 It is a structural schematic diagram of the corner piece forming mold of the present invention; Fig.11 It is a schematic diagram of the top view of the corner piece forming mold of the present invention; Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure along the AA direction; Fig.13 for Fig.11 Schematic diagram of the cross-sectional structure along the BB direction; Fig.14 It is a structural schematic diagram of the movable mold core of the molding die of the present invention; Fig.15 It is a structural schematic diagram of the fixed mold core of the forming mold of the present invention; Fig.16 It is a schematic diagram of the three-dimensional structure of the filling channel of the present invention; Fig.17 It is a schematic diagram of the top view of the filling channel of the present invention; Fig.18 It is a structural schematic diagram of the necking gate of the present invention; In the figure, 1, angle piece; 101, bonding part; 102, nut mounting part; 103, anti-rotation platform; 104, mounting hole; 105, reinforcing rib plate; 2, self-locking nut; 201, tail section connecting part; 202, head section locking part; 203, anti-rotation structure; 204, tail section tooth structure; 3, arch frame; 4, clamping frame; 5, elastic support; 6, fixed mold frame; 7, fixed mold core; 8, slider; 9 , inclined guide pillar; 10, movable mold frame; 11, movable mold core; 12, ejector plate guide pillar; 13, spring; 14, mold leg; 15, ejector; 16, ejector plate; 17, ejector push plate; 18, shovel base; 19, limit block; 20, bottom plate; 21, filling nozzle; 22, first guide groove; 23, second guide groove; 24, vertical runner; 25, horizontal runner; 26, branch runner; 27, necking gate. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1-Figure 5 As shown, an adhesive angle piece assembly for aerospace, comprising an angle piece 1 and a self-locking nut 2 arranged on the angle piece 1, wherein the angle piece 1 comprises an adhesive portion 101 and a nut mounting portion 102, wherein the adhesive portion 101 is used for connecting the angle piece 1 with a body, and the nut mounting portion 102 is used for mounting and positioning the self-locking nut 2 on the angle piece 1; The self-locking nut 2 comprises a nut body, the interior of which is hollow, a tail section connecting portion 201 is provided at one end of the nut body, a head section locking portion 202 is provided at the other end, a locking thread is provided on the head section locking portion 202, a mounting hole 104 is provided on the nut mounting portion 102, a free end of the tail section connecting portion 201 passes through the mounting hole 104 and is turned outward to be assembled with the angle piece 1; The nut body is also provided with an anti-rotation structure 203 , the angle piece 1 is provided with an anti-rotation platform 103 , and the anti-rotation platform 103 is provided with a positioning slot hole matched with the anti-rotation structure 203 .

[0032] The overall shape of the head section locking part 202 is a frustum-shaped structure, the interior of the head section locking part 202 is provided with an internal thread, and the head section locking part 202 includes a plurality of locking pieces, and a notch is provided between adjacent locking pieces. The notch is a U-shaped structure and is provided along the length direction of the head end locking part.

[0033] The corner piece 1 is made of non-metallic material, which not only replaces the traditional metal riveted support plate nut to meet the performance requirements, but also greatly achieves the purpose of weight reduction, with the weight reduction ratio reaching more than 70%.

[0034] The angle piece 1 is in an L-shaped structure, and the bonding portion 101 and the nut mounting portion 102 are arranged vertically.

[0035] At least one reinforcing rib plate 105 is provided between the bonding portion 101 and the nut mounting portion 102. The reinforcing rib plate 105 further increases the support strength of the angle piece 1.

[0036] A tail tooth structure 204 is disposed on the outer circumferential surface of the tail section connecting portion 201 .

[0037] The bonding portion 101 is a circular structure.

[0038] The anti-rotation structure 203 is a hexagonal anti-rotation structure, and the positioning slot is a hexagonal slot, which can prevent the self-locking nut 2 from rotating and ensure that the self-locking thread is stably positioned on the angle piece 1.

[0039] The bonding portion 101 of the corner piece assembly is bonded to the body by an adhesive, and there is no need to pre-form rivet holes on the body, which will not damage the body material. The body can be made of lightweight composite materials to meet the lightweight requirements. It also greatly improves the installation efficiency of the corner piece assembly and the positioning efficiency of parts, cables, etc. It does not require a high installation space and can be installed in a limited space that is not suitable for riveting or welding.

[0040] like Figure 5As shown, an example is given of installing the angle piece assembly in a narrow space of a machine body, and positioning and supporting the cable is achieved by the cooperation of the fastening bolts and the self-locking nuts 2.

[0041] like Figure 6-Figure 9 As shown, the present invention also discloses a method for installing an adhesive corner piece assembly for aerospace, and the specific steps are as follows: 1) Prepare the angle piece 1 and the self-locking nut 2; 2) Assembling the self-locking nut 2 and the angle piece 1: the tail end of the self-locking nut 2 passes through the mounting hole 104 of the angle piece 1 and is flanging, and the anti-rotation structure 203 of the self-locking nut 2 is inserted into the positioning slot hole of the angle piece 1; 3) Adhere the adhesive portion 101 of the corner piece 1 to the machine body using an adhesive.

[0042] The method also includes step 4), wherein auxiliary mounting parts are used to assist the bonding between the diagonal piece 1 and the machine body; the auxiliary mounting parts include an arch frame 3 and a clamping frame 4 arranged on the arch frame 3, wherein the arch frame 3 spans the bonding portion 101 of the diagonal piece 1, and the free end surface of the arch frame 3 is connected to the machine body through a film, and the two sides of the clamping frame 4 are respectively connected to the arch frame 3 through elastic supports 5. Under the action of the elastic supports 5, the clamping frame 4 has an initial position and a downward pressing position, and the clamping frame 4 can maintain force on the bonding portion 101 of the diagonal piece 1 when in the downward pressing position.

[0043] After the corner piece assembly is bonded to the machine body, the arch frame 3 of the auxiliary mounting piece spans the bonding portion 101 and is mounted on the machine body through the film, pressing the clamping frame 4. The clamping frame 4 moves downward under the action of the elastic support 5 and acts on the bonding portion 101 of the corner piece 1. It can maintain the pressure on the corner piece 1 during the bonding process of the corner piece 1, thereby ensuring the bonding quality between the corner piece assembly and the machine body. After the bonding of the corner piece assembly is completed, remove the auxiliary mounting piece and the film, and squeeze the clamping frame 4 in reverse from the active end of the clamping frame 4. The clamping frame 4 is reset to its initial position under the action of the elastic support 5.

[0044] Both sides of the pressing frame 4 are connected to the arch frame 3 through three elastic supports 5 respectively, two elastic supports 5 are located at the upper part, and one elastic support 5 is located at the lower part.

[0045] The auxiliary installation piece is used to assist the installation of the corner piece assembly, and there is no need to perform operations such as drilling holes on the machine body. After the auxiliary corner piece assembly is installed, no trace will be left on the machine body, and the performance of the machine body will not be affected.

[0046] A corner piece groove is provided on the bonding surface of the bonding portion 101 of the corner piece 1, and a cabin body groove is correspondingly provided on the mounting surface of the body. The glue can enter the corner piece groove and the cabin body groove and form glue nails. The glue nails can increase the connection strength between the corner piece 1 and the body, and the corner piece 1 will be more firmly bonded to the surface of the body.

[0047] The bonding part 101 of the corner piece 1 can be bonded to the machine body with J-357 adhesive (Petrochemical Research Institute of Heilongjiang Academy of Sciences). The corner piece 1 can withstand a tensile force of up to 650N after bonding with the adhesive, and the bending load of the nut mounting part 102 in two directions can reach 5.0N·m, which fully meets the performance requirements of the product.

[0048] like Figure 10-Figure 18 As shown, the present invention also discloses a corner piece forming mold, the corner piece 1 is the corner piece 1 of the above-mentioned aerospace adhesive corner piece assembly, and the forming mold includes a fixed mold frame 6, a fixed mold core 7, a slider 8, an inclined guide column 9, a movable mold frame 10, a movable mold core 11, an ejector plate guide column 12, a spring 13, a mold leg 14, an ejector 15, an ejector plate 16 and an ejector push plate 17; The fixed mold core 7 is arranged on the fixed mold frame 6, and the movable mold core 11 is arranged on the movable mold frame 10. The fixed mold core 7 and the movable mold core 11 are molded together to form a cavity for molding the corner piece 1. A filling nozzle 21 is arranged on the fixed mold frame 6, and the filling nozzle 21 is connected with the cavity through a filling channel; The fixed mold frame 6 is provided with a fixed frame column hole for positioning the inclined guide column 9, the slider 8 is provided with a block column hole for the rod portion of the inclined guide column 9 to pass through, and the movable mold frame 10 is provided with a movable frame slot hole for accommodating the rod end of the inclined guide column 9; The fixed mold frame 6 is also provided with a shovel base 18, and the movable mold frame 10 is also provided with a limit block 19 for limiting the outward position of the slider 8. The slider 8 is slidably arranged on the movable mold frame 10 and is located between the movable mold core 11 and the limit block 19. The inner side surface of the shovel base 18 is provided with an inclined surface acting on the slider 8, and the inclination angle of the inclined surface is consistent with the inclination angle of the inclined guide column 9; The ejector plate 16 is connected to the ejector push plate 17, the movable mold frame 10 is provided with an ejector hole, one end of the ejector 15 is connected to the ejector plate 16, and the other end passes through the ejector hole and is connected to the movable mold core 11, the ejector plate 16 is also provided with an ejector plate guide column 12, the outer side of the ejector plate guide column 12 is sleeved with a spring 13, and the spring 13 is located between the movable mold frame 10 and the ejector plate 16; The movable mold frame 10 is arranged on a bottom plate 20 through mold legs 14 , and a push rod hole is provided on the bottom plate 20 for the rod end of the push rod to pass through and act on the ejector push plate 17 .

[0049] The filling channel includes a vertical runner 24, a transverse runner 25 and a branch runner 26 corresponding to the cavity. The inlet of the vertical runner 24 is connected to the filling nozzle 21, and the outlet of the vertical runner 24 is connected to the inlet of the transverse runner 25. The branch runner 26 has a conical structure, and the outlet of the transverse runner 25 is connected to the inlet of the branch runner 26. The outlet end of the branch runner 26 forms a necking gate 27 connected to the cavity.

[0050] The necking gate 27 is a round hole gate with a diameter of 1 mm. The traditional "fan-shaped gate" not only needs to be manually removed after the product is formed, but also has obvious gate marks on the edge of the product. The pouring method selected for this corner piece molding mold is a "latent gate". The gate is a dot of about 1 mm. The molten material is injected into the cavity through the runner through the "neck" gate, which increases the pouring pressure and makes the corner piece 1 product more full and defect-free. After the corner piece product is solidified and formed, when the ejector pushes the product out of the dynamic mold cavity, the product and the gate can separate by themselves, and the gate marks are slight.

[0051] The corner piece 1 is injection molded by thermoplastic polyimide powder or granules. Polyimide is an organic polymer material with excellent comprehensive performance, corrosion resistance, fatigue resistance, low density and excellent high and low temperature performance. Its tensile strength is ≥80MPa and its bending strength is ≥100MPa. Although its strength cannot be compared with that of metal, its comprehensive performance is far superior to other non-metallic materials. It is used in non-critical load-bearing parts of aircraft. While meeting the performance requirements, it has a significant weight reduction effect compared to metal materials. "Thermoplastic" polyimide can be re-molded and re-formed, with a small shrinkage rate, and the product size is stable after molding.

[0052] There are four corresponding processing positions for processing the corner piece 1 on the movable mold core 11 and the fixed mold core 7. A guide rod is provided on the limit block 19, and a guide hole for the guide rod to pass through is provided on the slider 8. A slide rail for the sliding movement of the slider 8 is provided on the movable mold frame 10. A first guide groove 22 adapted to the injection molding machine is provided on the outer surface of the fixed mold frame 6. It is convenient to position the fixed mold frame 6 on the injection molding machine. A second guide groove 23 adapted to the slideway of the injection molding machine is provided on the bottom plate 20 or between the bottom plate 20 and the mold leg 14. It can assist the sliding of movable mold parts such as the movable mold frame 10 and the movable mold core 11 on the injection molding machine when the mold is opened. A guide column is provided on the fixed mold frame 6, and a guide column hole adapted to the guide column is provided on the movable mold frame 10.

[0053] The corner piece forming die can process the corner piece 1 in the above-mentioned adhesive corner piece assembly for aerospace. In the step of preparing the corner piece 1 in the installation method of the adhesive corner piece assembly for aerospace, the corner piece forming die can also be used to process the corner piece 1.

[0054] During operation, after the mold is closed, the slider 8 cooperates closely with the movable mold core 11 and the fixed mold core 7 to form a closed cavity, and the powder or granular raw material is added to the barrel. The raw material is fed through the feed pipe. There is a heated screw on the outside of the feed pipe to melt and mix the raw material. The molten material is injected into the cavity through the nozzle 21 with high pressure through the nozzle. After pressure maintenance, cooling and solidification in the cavity, the mold can be opened. During the mold opening process, under the action of the inclined guide column 9, the slider 8 will move to the limit block 19. At this time, the product after cooling and solidification will remain in the cavity of the movable mold core 11. The rod end of the push rod on the injection molding machine passes through the central push rod hole on the bottom plate 20 and acts on the ejector push plate 17. The ejector plate 16 drives the ejector plate guide column 12 to move up to compress the spring 13, and the ejector 15 moves up with the ejector plate 16. The product is pushed out of the cavity through the ejector 15, and the corner piece 1 is discharged. The above-mentioned corner piece 1 is precisely formed by adopting the forming mold. The forming mold can select the appropriate number of sliders 8 as needed, and can have multiple cavities in one mold, such as four cavities in one mold, so as to realize the simultaneous forming of multiple corner piece 1 products in a single mold opening and closing process. Compared with traditional machining, the production efficiency of the corner piece 1 is greatly improved, and it is more suitable for mass production of the corner piece 1.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adhesive-type angle piece assembly for aerospace, comprising an angle piece (1) and a self-locking nut (2) arranged on the angle piece (1), characterized in that: The angle piece (1) comprises an adhesive portion (101) and a nut mounting portion (102), wherein the adhesive portion (101) is used for connecting the angle piece (1) to the machine body, and the nut mounting portion (102) is used for mounting and positioning the self-locking nut (2) on the angle piece (1); The self-locking nut (2) comprises a nut body, the interior of the nut body is hollow, one end of the nut body is provided with a tail section connecting portion (201), the other end is provided with a head section locking portion (202), the head section locking portion (202) is provided with a locking thread, the nut mounting portion (102) is provided with a mounting hole (104), the free end of the tail section connecting portion (201) passes through the mounting hole (104) and is turned outward to be assembled with the angle piece (1); An anti-rotation structure (203) is also provided on the nut body, an anti-rotation platform (103) is provided on the angle piece (1), and a positioning slot hole matching the anti-rotation structure (203) is provided in the anti-rotation platform (103).

2. The aerospace adhesive corner piece assembly according to claim 1, characterized in that: The overall appearance of the head section locking portion (202) is a frustum-shaped structure, and the head section locking portion (202) comprises a plurality of locking plates, with notches being provided between adjacent locking plates.

3. The aerospace adhesive corner piece assembly according to claim 1, characterized in that: The angle piece (1) is made of non-metallic material; and / or the angle piece (1) is in an L-shaped structure, and the bonding portion (101) and the nut mounting portion (102) are arranged vertically.

4. The aerospace adhesive corner piece assembly according to claim 1, characterized in that: At least one reinforcing rib plate (105) is provided between the bonding portion (101) and the nut mounting portion (102); and / or a tail section tooth-shaped structure (204) is provided on the outer peripheral surface of the tail section connecting portion (201).

5. The aerospace adhesive corner piece assembly according to claim 1, characterized in that: The bonding portion (101) is a circular structure.

6. The aerospace adhesive corner piece assembly according to claim 1, characterized in that: The anti-rotation structure (203) is a hexagonal anti-rotation structure, and the positioning slot is a hexagonal slot.

7. A method for installing an aerospace adhesive corner piece assembly according to any one of claims 1 to 6, characterized in that: Here are the steps: 1) Prepare the angle piece (1) and the self-locking nut (2); 2) Assembly: The tail end of the self-locking nut (2) is passed through the mounting hole (104) of the angle piece (1) and flanged, and the anti-rotation structure (203) of the self-locking nut (2) is inserted and positioned in the positioning slot hole of the angle piece (1); 3) Adhere the adhesive portion (101) of the corner piece (1) to the machine body by using an adhesive.

8. The method for installing an adhesive corner piece assembly for aerospace according to claim 7, characterized in that: The invention also includes step 4) using an auxiliary mounting part to assist the bonding of the corner piece (1); the auxiliary mounting part includes an arch frame (3) and a pressing frame (4) arranged in the arch frame (3); the arch frame (3) spans the bonding portion (101) of the corner piece (1); the arch frame (3) is connected to the machine body via a film; the two sides of the pressing frame (4) are respectively connected to the arch frame (3) via elastic supports (5); under the action of the elastic supports (5), the pressing frame (4) has an initial position and a downward pressing position; when in the downward pressing position, the pressing frame (4) can act on the bonding portion (101) of the corner piece (1).

9. A corner piece forming die, wherein the corner piece is a corner piece of an adhesive corner piece assembly for aerospace use according to any one of claims 1 to 6, characterized in that: It comprises a fixed die frame (6), a fixed die core (7), a slide block (8), an inclined guide column (9), a movable die frame (10), a movable die core (11), an ejector plate guide column (12), a spring (13), a die leg (14), an ejector (15), an ejector plate (16) and an ejector push plate (17); The fixed mold core (7) is arranged on the fixed mold frame (6), and the movable mold core (11) is arranged on the movable mold frame (10); the fixed mold core (7) and the movable mold core (11) are combined to form a cavity for molding the corner piece (1); a filling nozzle (21) is provided on the fixed mold frame (6), and the filling nozzle (21) is connected to the cavity through a filling channel; The fixed mold frame (6) is provided with a fixed frame column hole for positioning the inclined guide column (9), the sliding block (8) is provided with a block column hole for the rod portion of the inclined guide column (9) to pass through, and the movable mold frame (10) is provided with a movable frame slot hole for accommodating the rod end of the inclined guide column (9); The fixed mold frame (6) is also provided with a shovel base (18), and the movable mold frame (10) is also provided with a limit block (19) for limiting the outward movement position of the slider (8); the slider (8) is slidably arranged on the movable mold frame (10) and is located between the movable mold core (11) and the limit block (19); an inclined surface acting on the slider (8) is provided on the inner side surface of the shovel base (18), and the inclination angle of the inclined surface is consistent with the inclination angle of the inclined guide column (9); The ejector plate (16) is connected to the ejector push plate (17); an ejector hole is provided on the movable mold frame (10); one end of the ejector (15) is connected to the ejector plate (16); the other end passes through the ejector hole and is connected to the movable mold core (11); an ejector plate guide column (12) is also provided on the ejector plate (16); a spring (13) is sleeved on the outer side of the ejector plate guide column (12); the spring (13) is located between the movable mold frame (10) and the ejector plate (16); The movable mold frame (10) is arranged on a bottom plate (20) via mold legs (14), and a push rod hole is provided on the bottom plate (20).

10. The corner piece forming mold according to claim 9, characterized in that: The filling channel comprises a vertical flow channel (24), a transverse flow channel (25) and a branch flow channel (26) corresponding to the cavity; the inlet of the vertical flow channel (24) is connected to the filling nozzle (21); the outlet of the vertical flow channel (24) is connected to the inlet of the transverse flow channel (25); the branch flow channel (26) is a conical structure; the outlet of the transverse flow channel (25) is connected to the inlet of the branch flow channel (26); and the outlet end of the branch flow channel (26) forms a necking gate (27) connected to the cavity.

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