Drawing die tire for multi-curved-surface special-shaped skin of aircraft refueling pod

Abstract

The utility model provides an airplane refueling pod multi-curved-surface special-shaped skin drawing die tire which comprises a die tire base body used for forming, a first fixing lug plate is arranged at the bottom of one end face of the die tire base body, and a second fixing lug plate is arranged at the bottom of the other end face of the die tire base body. The end face where the first fixing lug plate is located and the end face where the second fixing lug plate is located are symmetrically provided with lifting ring assemblies correspondingly. A first reference hole is formed in one end of the top of the mould base body, and a second reference hole is formed in the other end; drilling template assemblies are arranged on the side edges of the first datum hole and the second datum hole correspondingly. And a plastic profile structure layer is laid on the top of the mould base body. The stretching mold is designed based on a skin product digital model, adopts a structural form of a metal matrix and a machinable plastic molded surface to replace a traditional mortar matrix, is used for stretching and forming a special-shaped skin, and has the advantages of stable matrix structure, high molded surface precision, complete functions, high strength, good working stability, long service life, simplicity in operation, convenience in maintenance and the like.

Description

Technical Field

[0001] The utility model relates to the field of aviation equipment manufacturing, in particular to a multi-curved special-shaped skin stretching die for an aircraft refueling pod. Background Art

[0002] The front section of the aluminum alloy skin of a certain aircraft refueling pod shell features a multi-surface, irregularly shaped structure, requiring a specialized stretching die to be formed using a stretching process on a skin stretching machine. Traditionally, these die-line templates are manufactured using a wooden frame and mortar as the base. The working surfaces are primarily hand-finished, using a template as the basis for on-site polishing and comparison. This complex process results in low manufacturing precision, a long manufacturing period, high costs, and a short service life. Furthermore, the die's main structure is weak and easily deformed. The mortar base cannot be recycled, which is environmentally friendly, and the epoxy resin mold surface is prone to deformation and cracking, affecting the surface precision and surface quality of the finished product. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-curved special-shaped skin stretching mold for an aircraft refueling pod. The stretching mold is designed based on the digital model of the skin product, adopts a metal matrix and a machinable plastic surface structure, replaces the traditional mortar matrix, and is used for the stretching forming of the special-shaped skin. The mold has the advantages of stable matrix structure, high surface accuracy, complete functions, high strength, good working stability, long service life, simple operation, and easy maintenance.

[0004] In order to realize the above-mentioned technical features, the purpose of the utility model is realized as follows: A multi-curved special-shaped skin stretching mold for an aircraft refueling pod, comprising a mold base for forming, a first fixed ear plate being provided at the bottom of one end surface of the mold base, and a second fixed ear plate being provided at the bottom of the other end surface; the end surface where the first fixed ear plate is located and the end surface where the second fixed ear plate are located are symmetrically installed with lifting ring assemblies; a first reference hole is provided at one end of the top of the mold base, and a second reference hole is provided at the other end; drilling template assemblies are provided on the sides of the first reference hole and the second reference hole respectively; a plastic profile structure layer is laid on the top of the mold base.

[0005] The mold base is made of a cast aluminum base or a cast steel base, and the forming surface of the mold base is processed by numerical control programming.

[0006] The inner bottom of the mold base adopts a cavity structure.

[0007] The first fixing lug plate and the second fixing lug plate are respectively processed with open bolt grooves.

[0008] The lifting ring assembly comprises a lifting ring fixing seat, on which a lifting ring is installed.

[0009] The drilling template assembly comprises a template fixed to the top of a mold base by long bolts, and a drill sleeve is installed on the template.

[0010] The plastic profile structure layer is formed by applying a resin material to the surface of the mold base and solidifying it after being left to stand for a period of time at room temperature.

[0011] The molding surface of the mold base is engraved with a skin margin line, a skin edge line, an opening edge line and a milling area outline line by a numerically controlled engraving method.

[0012] The utility model has the following beneficial effects:

[0013] 1. This stretching die is designed based on the digital model of the skin product. It adopts a metal matrix and a machinable plastic surface structure to replace the traditional mortar matrix. It is used for stretching and forming special-shaped skins. It has the advantages of stable matrix structure, high surface precision, complete functions, high strength, good working stability, long service life, simple operation and easy maintenance.

[0014] 2. The use of cast aluminum or cast steel base ensures its structural strength and stability, thereby ensuring its service life. The use of cast steel base in the specific manufacturing process will result in lower costs.

[0015] 3. The cavity structure is used to achieve a good material reduction effect, thereby reducing the weight of the entire mold base, saving materials and reducing production costs.

[0016] 4. The open bolt slots facilitate subsequent fixing of the first fixing ear plate and the second fixing ear plate with bolts, thereby fixing the entire mold base on the workbench.

[0017] 5. The above-mentioned lifting ring assembly facilitates the subsequent lifting of the entire mold base, thereby facilitating the positioning and installation of the entire mold base, reducing installation difficulty and improving installation efficiency.

[0018] 6. The drilling template assembly facilitates the drilling of reference holes after subsequent forming is completed. At the same time, the drill sleeve adopts a high-hardness drill sleeve to increase its service life.

[0019] 7. The above-mentioned plastic surface structure layer can be peeled off and repaired repeatedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a three-dimensional diagram from the first perspective of the present invention.

[0022] Figure 2This is a three-dimensional diagram from the second perspective of the present invention.

[0023] Figure 3 This is a three-dimensional diagram from the third perspective of the present invention.

[0024] Figure 4 This is a three-dimensional diagram of the molding surface engraving lines of the mold base of the utility model from the first perspective.

[0025] Figure 5 This is a three-dimensional diagram of the molding surface engraving lines of the mold base of the utility model from the second perspective.

[0026] Figure 6 This is a three-dimensional diagram of the skin product of this utility model from the first perspective.

[0027] Figure 7 This is a three-dimensional diagram of the skin product of this utility model from the second perspective.

[0028] In the figure: open bolt slot 1, first fixing ear plate 2, lifting ring 3, lifting ring fixing seat 4, first reference hole 5, long bolt 6, template 7, drill sleeve 8, mold base 9, skin product 10, drilling template assembly 11, second reference hole 12, second fixing ear plate 13, lifting ring assembly 14, cavity structure 15, skin hole 16, skin milling area 17. DETAILED DESCRIPTION

[0029] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0030] See also Figure 1-7 A multi-curved special-shaped skin stretching mold for an aircraft refueling pod includes a mold base 9 for forming, a first fixing lug 2 is provided at the bottom of one end face of the mold base 9, and a second fixing lug 13 is provided at the bottom of the other end face; a lifting ring assembly 14 is symmetrically installed on the end face where the first fixing lug 2 and the end face where the second fixing lug 13 are located; a first reference hole 5 is provided at one end of the top of the mold base 9, and a second reference hole 12 is provided at the other end; drilling template assemblies 11 are provided on the sides of the first reference hole 5 and the second reference hole 12 respectively; a plastic profile structure layer is applied on the top of the mold base 9. By adopting the above-mentioned stretching mold designed based on the digital model of the skin product, using a metal matrix and a machinable plastic profile structure to replace the traditional mortar matrix, it is used for special-shaped skin stretching forming, and has the advantages of stable matrix structure, high profile accuracy, complete functions, high strength, good working stability, long service life, simple operation, and convenient maintenance.

[0031] Furthermore, the mold base 9 is constructed from a cast aluminum or cast steel substrate, and its shaped surface is machined using CNC programming. The use of a cast aluminum or cast steel substrate ensures structural strength and stability, thereby ensuring a long service life. Using a cast steel substrate results in lower manufacturing costs.

[0032] Furthermore, the inner bottom of the mold base 9 adopts a cavity structure 15. The cavity structure 15 has a good material reduction effect, thereby reducing the weight of the entire mold base 9, saving materials, and reducing production costs.

[0033] Furthermore, the first fixing lug 2 and the second fixing lug 13 are each machined with an open bolt slot 1. The open bolt slot 1 facilitates subsequent fixing of the first fixing lug 2 and the second fixing lug 13 with bolts, thereby fixing the entire mold base 9 on the workbench.

[0034] Furthermore, the lifting ring assembly 14 includes a lifting ring fixing base 4, on which a lifting ring 3 is mounted. The lifting ring assembly 14 facilitates the subsequent lifting of the entire mold base 9 by lifting, thereby facilitating the positioning and installation of the entire mold base 9, reducing installation difficulty and improving installation efficiency.

[0035] Furthermore, the drilling template assembly 11 includes a template 7 secured to the top of the mold base 9 by long bolts 6. A drill sleeve 8 is mounted on the template 7. This facilitates the drilling of reference holes after the molding process is complete. The drill sleeve 8 is constructed with high hardness to extend its service life.

[0036] Furthermore, the plastic profile structure layer is formed by applying a resin material to the surface of the mold base 9 and solidifying it after standing for a period of time at room temperature. The plastic profile structure layer can be peeled off and repaired repeatedly.

[0037] Furthermore, the molding surface of the mold base 9 is engraved with a skin allowance line 18, a skin edge line 19, an opening edge line 21, and a milling area contour line 20 by means of CNC engraving. The skin allowance line 18, skin edge line 19, opening edge line 21, and milling area contour line 20 facilitate control of the molding process during subsequent molding to ensure molding accuracy.

[0038] The basic principle of this utility model:

[0039] The utility model provides a multi-curved, special-shaped skin stretching mold for an aircraft refueling pod. The mold base 9 is designed based on a digital model of a skin product 10. The mold base 9 adopts a cast aluminum base and a machinable plastic surface structure, and the surface layer can be repeatedly peeled and repaired. The mold base 9 is manufactured using advanced digital quantity transmission instead of traditional analog quantity transmission. CNC programming is used for processing. The mold surface is engraved with skin allowance lines, skin edge lines, opening edge lines, and milling area contour lines using CNC engraving. These lines serve as trimming and shaping of the skin contour, reference for opening position, and as a basis for rubbing and reverse lines of milling templates.

[0040] A drilling template assembly 11 is provided with skin positioning holes, and a high-hardness drill sleeve is pressed on the drilling template assembly 11 to increase its service life. The positioning holes of the skin and the chemical milling template are processed through the same drilling template assembly 11 to improve the positioning accuracy of the skin and the chemical milling template. Steel bushings are pressed at the pin hole positions on the molding surface to improve their wear resistance. A lifting ring assembly 14 is provided on the mold base 9 to facilitate the lifting and displacement of the mold base 9;

[0041] There are two reference holes on the mold surface, which are used as reference holes for CNC machining and three-coordinate measurement and detection, and are marked with the measured coordinate values ​​of the hole positions. The mold surface can be regularly inspected by point measurement and digital-analog comparison. It has the advantages of stable base structure, high surface accuracy, complete functions, high strength, good working stability, long service life, simple operation and easy maintenance.

[0042] The working process of this utility model:

[0043] 1) The mold base 9 can be made of cast aluminum or cast steel, and the cost of using cast steel will be lower;

[0044] 2) The plastic surface structure layer is made of a similar resin product. After the A and B components are mixed in a certain proportion and applied to the surface of the mold base as required, it will solidify after being left at room temperature for a period of time and can be machined;

[0045] 3) The milling area contour line NC-engraved on the mold is used as the basis for rubbing the reverse line in the manufacture of the milling template. When making the milling template, the milling area contour line on the mold can be rubbed onto the milling template through rubbing paper and used as the boundary line of the opening shape of the milling template;

[0046] 4) After the skin is stretched and formed on the die, two positioning holes are drilled in the allowance area of ​​the skin using a drilling template. The two positioning holes on the milling template are also drilled on the same stretching die using the same drilling template. When the skin is milled and marked, the milling template and the skin are positioned by inserting positioning pins through these two positioning holes;

[0047] 5) The structure and principle of the milling template can adopt the prior patent CN220113294U, a three-dimensional milling template for multi-curved special-shaped skin of an aircraft refueling pod.

Claims

1. A multi-curved special-shaped skin stretching mold for an aircraft refueling pod, characterized in that: The invention comprises a mold base (9) for forming, wherein a first fixing ear plate (2) is provided at the bottom of one end surface of the mold base (9), and a second fixing ear plate (13) is provided at the bottom of the other end surface; a lifting ring assembly (14) is symmetrically installed on the end surface where the first fixing ear plate (2) is located and the end surface where the second fixing ear plate (13) is located; a first reference hole (5) is provided at one end of the top of the mold base (9), and a second reference hole (12) is provided at the other end; drilling template assemblies (11) are provided on the sides of the first reference hole (5) and the second reference hole (12); and a plastic profile structure layer is applied on the top of the mold base (9).

2. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 1, characterized in that: The mold base (9) is a cast aluminum base or a cast steel base, and the forming surface of the mold base (9) is processed by numerical control programming.

3. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 2, characterized in that: The inner bottom of the mold base (9) adopts a cavity structure (15).

4. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 1, characterized in that: The first fixing ear plate (2) and the second fixing ear plate (13) are each machined with an open bolt slot (1).

5. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 1, characterized in that: The lifting ring assembly (14) comprises a lifting ring fixing seat (4), and a lifting ring (3) is mounted on the lifting ring fixing seat (4).

6. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 1, characterized in that: The drilling template assembly (11) comprises a template (7) fixed to the top of a mold base (9) via long bolts (6), and a drill sleeve (8) is installed on the template (7).

7. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 1, characterized in that: The plastic profile structure layer is formed by applying a resin material to the surface of the mold base (9) and solidifying it after being left to stand for a period of time at room temperature.

8. The aircraft refueling pod multi-curved special-shaped skin stretching mold according to claim 1, characterized in that: The molding surface of the mold base (9) is engraved with a skin margin line (18), a skin edge line (19), an opening edge line (21) and a milling area outline line (20) by means of numerical control engraving.

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