Large-scale multi-rib deep-cavity airplane sheet metal part pre-storage hydroforming equipment

Abstract

The utility model belongs to the field of plate forming equipment, and particularly relates to large multi-rib deep-cavity airplane sheet metal part pre-storage liquid-filling forming equipment. Comprising a lower die, an upper die, a guide column, a plurality of guide mechanisms, a plurality of pressure-bearing assemblies, a sealing strip, a high-pressure liquid filling connector assembly, a material storage module I and a material storage module II. The lower die comprises a part reinforcing rib forming area and a part flange edge forming area, the reinforcing rib forming area is divided into a plurality of concave cavities, and when a part is formed, each concave cavity is matched with the material storage module I and the material storage module II; the lower die comprises an edge pressing area, and the lower die and the edge pressing area of the upper die jointly clamp a part during use, so that the edge pressing effect is achieved; a guide mechanism mounting position is arranged on the lower die and is used for mounting a guide mechanism assembly to form guidance with the guide surface of the upper die; the lower die is provided with a pressure-bearing block mounting position for mounting a pressure-bearing block assembly and adjusting a die assembly gap between the upper die and the lower die so as to control the edge pressing effect; a guide post is fixed on the upper end surface of the lower die and is used for guiding when the upper die and the lower die are closed; the upper die comprises an edge pressing area matched with the lower die, the edge pressing area and the edge pressing area of the lower die jointly clamp a part during use, and a liquid chamber space is formed between a plate and the upper die; a sealing groove is formed in the upper die edge pressing area and used for installing a sealing strip, and the sealing groove is attached to the upper surface of a plate when used and plays a sealing role between the upper die edge pressing area and the plate. The upper die further comprises a pressure-bearing surface which is attached to a pressure-bearing block mounted on the lower die during die assembly and is used for protecting the molded surface of the die and adjusting a die assembly gap; the upper die comprises a liquid filling port and a liquid filling outlet and is used for injecting a pressure medium into the liquid chamber and increasing the pressure of the liquid chamber; and the liquid filling port is connected with the high-pressure liquid filling joint. According to the utility model, the problem of material shortage at the root of the reinforcing rib is solved; and a flexible storage module is designed, so that the transition cost is saved.

Description

Technical Field

[0001] This utility model belongs to the field of sheet metal forming equipment, specifically relating to a large-scale multi-ribbed deep cavity aircraft sheet metal parts pre-storage liquid filling forming equipment. Background Technology

[0002] The aircraft engine nacelle is a crucial component of an aircraft, serving as a protective shield for the engine and playing a vital role in protecting and maintaining its operation. Its design and manufacturing directly impact aircraft performance and operational safety. The nacelle reinforcing bar is a critical structural part within the engine nacelle, a large, multi-ribbed, deep-cavity, bow-shaped structure. Its manufacturing quality directly affects flight safety. Medium-sized transport aircraft, both domestically and internationally, commonly use turboprop engines with relatively small nacelle radii. Therefore, the reinforcing bar components are characterized by large bow heights, high-height reinforcing ribs, and dense rib distribution, making them challenging to form. Due to strength and weight considerations, these large, multi-ribbed, deep-cavity aircraft sheet metal parts are typically manufactured using a single-piece drop-forming process from aerospace-grade aluminum sheet. For a long time, problems such as poor surface quality, severe wrinkles in the flange area, long production cycles, high labor intensity, low part precision, short fatigue life, and poor quality stability have seriously affected aircraft product quality and delivery times. Figure 1 As shown, the reinforcing stub of a medium-sized transport aircraft engine typically has reinforcing ribs in different directions, dividing the part into several deep cavities, creating a situation where materials are mutually blocked. Because the reinforcing ribs are large (rib height 32mm), which is 6-7 times that of conventional reinforcing ribs, the root of the reinforcing ribs is very prone to cracking due to lack of material during forming. Utility Model Content

[0003] Purpose of the utility model: This utility model overcomes the problems of rigid impact on part blanks, poor surface quality of parts, severe wrinkles, and difficulty in forming the root of reinforcing ribs in the prior art, and provides a pre-filling liquid forming equipment for large multi-ribbed deep cavity aircraft sheet metal parts.

[0004] Technical solution: In order to achieve the above-mentioned utility model objectives, this utility model specifically designs a large-scale multi-ribbed deep cavity aircraft sheet metal parts pre-storage liquid filling forming equipment, including a lower mold, an upper mold, guide pillars, multiple guiding mechanisms, multiple pressure-bearing components, sealing strips, high-pressure liquid filling joint components, storage module I, and storage module II;

[0005] The lower mold includes a part reinforcing rib forming area and a part flange forming area. The reinforcing rib forming area is divided into multiple cavities. When forming the part, each cavity matches the material storage module I and material storage module II. The lower mold includes a pressing area, which, together with the pressing area of ​​the upper mold, clamps the part to perform the pressing function. The lower mold has a guide mechanism mounting position for installing the guide mechanism assembly, which forms a guide with the guide surface of the upper mold. The lower mold has a pressure block mounting position for installing the pressure block assembly, which is used to adjust the mold closing gap between the upper and lower molds to control the pressing effect. The upper end face of the lower mold is also fixed with a guide post for guiding when the upper and lower molds are closed.

[0006] The upper die contains a pressing area that matches the lower die. When in use, the pressing area of ​​the lower die clamps the parts together, forming a liquid chamber space between the sheet metal and the upper die. The pressing area of ​​the upper die has a sealing groove for installing a sealing strip. When in use, it is attached to the upper surface of the sheet metal and plays a sealing role between the pressing area of ​​the upper die and the sheet metal.

[0007] The upper mold also includes a pressure-bearing surface, which fits against the pressure-bearing block installed in the lower mold when the mold is closed, to protect the mold surface and adjust the mold closing gap; the upper mold includes a filling port and a filling outlet, which are used to inject pressure medium into the liquid chamber to increase the liquid chamber pressure; the filling port is connected to a high-pressure filling connector.

[0008] Furthermore, the cavity of the lower mold has vent holes, which are used to remove air between the part sheet and the lower mold in time during part forming, reduce forming pressure, and remove excess liquid when necessary.

[0009] Furthermore, both storage module I and storage module II include several storage protrusions and cylindrical pins that match the storage protrusions. In use, the cylindrical pins are used to fix the storage protrusions in the cavity of the lower mold.

[0010] Furthermore, the upper surface of the guide plate has several small blind holes, which are filled with grease during use to guide and lubricate the mold during opening and closing.

[0011] Furthermore, the upper mold adopts an arc-shaped surface, which can bend the part sheet during the mold closing stage, simplifying the process, reducing the size of the liquid chamber, and improving the utilization rate and pressurization efficiency of the pressure medium.

[0012] Furthermore, the lower mold includes a reference hole, which serves as a measurement reference for the lower mold and is used for operations such as inspection and maintenance of the lower mold. The plane of the reference hole is slightly lower than the mold closing plane.

[0013] Furthermore, the lower die includes a centerline, which ensures that the lower die can be installed in the center of the machine tool table and controls the force balance.

[0014] Technical effects: (1) This utility model provides a pre-storage liquid filling forming equipment for large multi-ribbed deep cavity aircraft sheet metal parts, realizing flexible medium forming of large multi-ribbed deep cavity aircraft sheet metal parts, breaking through the existing technical bottleneck, and realizing a significant improvement in the surface quality of the parts.

[0015] (2) This utility model provides a pre-storage liquid filling forming equipment for large multi-ribbed deep cavity aircraft sheet metal parts. The pre-storage function is reasonably designed to realize the forming of large high-rib parts. It can form large multi-ribbed deep cavity aircraft sheet metal parts with a reinforcing rib height of 30-35mm, achieving a breakthrough that the reinforcing rib height of the formed large multi-ribbed deep cavity aircraft sheet metal parts is 6-7 times that of the conventional reinforcing rib height.

[0016] (3) This utility model provides a large-scale multi-ribbed deep cavity aircraft sheet metal parts pre-storage liquid filling forming equipment. The upper mold adopts an arc-shaped smooth curved surface. When the mold is closed, the part sheet is bent, which simplifies the process, reduces the liquid chamber space, improves the utilization rate of the pressure medium, and improves the pressurization efficiency.

[0017] (4) This utility model provides a large-scale multi-ribbed deep cavity aircraft sheet metal parts pre-storage liquid filling forming equipment, which has a pressing system to control the material flow state of the parts and avoid wrinkles in the parts;

[0018] (5) This utility model provides a large-scale multi-ribbed deep cavity aircraft sheet metal parts pre-storage liquid filling forming equipment with a flexible storage module. By disassembling and assembling the storage module, three different profiles can be quickly switched, saving the cost of two sets of transition molds.

[0019] (6) This utility model provides a large-scale multi-ribbed deep cavity aircraft sheet metal parts pre-storage liquid filling forming equipment with a reasonable exhaust system, which can remove excess air in time and facilitate the uniform forming of parts; the upper and lower molds are interlocked through guide surfaces, which improves the safety and stability of the equipment. Attached Figure Description

[0020] Figure 1 A schematic diagram of a large, multi-ribbed, deep-cavity aircraft sheet metal part.

[0021] Figure 2 A schematic diagram of a liquid filling forming equipment for large, multi-ribbed, deep-cavity aircraft sheet metal parts.

[0022] Figure 3 Schematic diagram of the guiding mechanism;

[0023] Figure 4 This is a schematic diagram of a pressure-bearing component;

[0024] Figure 5 This is a schematic diagram of a high-voltage connector assembly;

[0025] Figure 6 This is a schematic diagram of the material storage module I10;

[0026] Figure 7 This is a schematic diagram of the material storage module II11;

[0027] The components are: 1. Lower mold, 2. Upper mold, 3. Guide pillar, 4. Guide mechanism, 4a. Guide plate, 4b. Bolt, 5. Pressure-bearing component, 5a. Pressure-bearing block, 5b. Bolt, 6. Sealing strip, 7. High-pressure filling connector assembly, 7a. High-pressure connector, 7b. Sealing ring, 8. Universal lifting point, 9. Bow-shaped ring hanger, 10. Storage module I, 10a-10e. Storage protrusion, 10f. Cylindrical pin, 11. Storage module II, 11a-11e. Storage protrusion, 11f. Cylindrical pin. Detailed Implementation

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of this utility model, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0029] See appendix Figures 1-7 ,like Figure 2 As shown, a large-scale, multi-ribbed, deep-cavity aircraft sheet metal part pre-filling and liquid-filling forming device is provided, including a lower mold 1, an upper mold 2, two guide pillars 3, multiple guiding mechanisms 4, multiple pressure-bearing components 5, sealing strips 6, high-pressure liquid-filling connector components 7, multiple universal lifting points 8, multiple bow-shaped ring hangers 9, one set of material storage module I 10, and one set of material storage module II 11. The guiding mechanism 4 includes one guide plate 4a and four connecting bolts 4b. Figure 3 The pressure-bearing component 5 includes a pressure-bearing block 5a and two connecting bolts 5b, such as... Figure 4 The high-pressure filling connector assembly 7 includes a high-pressure connector 7a and a seal 7b, such as... Figure 5 The storage module I10 includes 5 storage bumps 10a-10e and 10 cylindrical pins 10f, as shown below. Figure 6 The storage module II 11 includes 5 storage protrusions 11a-11e and 11 cylindrical pins 11f, as shown below. Figure 7 .

[0030] The lower die 1 includes a part reinforcing rib forming area and a part flange forming area. Five cavities are formed between the reinforcing ribs, each containing a vent hole. These vents remove air between the part sheet and the lower die during forming, reducing forming pressure and, if necessary, removing excess liquid. The lower die has protrusion mounting holes. During operation, cylindrical pins 10f connect storage protrusions 10a-10e to the cavities of the lower die 1. The storage module stores a portion of the sheet material in the cavities during the initial forming stage, which is then used to replenish material at the base of the reinforcing ribs later, preventing breakage due to insufficient material at the rib base. The lower die 1 also includes a blanking area, which, together with the blanking area of ​​the upper die 2, clamps the part, providing a blanking function. The lower mold 1 has a guide mechanism mounting position for mounting the guide mechanism assembly 4, which, together with the upper mold guide surface, forms a guide. The upper surface of the guide plate 4 has several small blind holes, which are filled with grease during use, providing guidance and lubrication during mold opening and closing. The lower mold 1 also has a pressure block mounting position for mounting the pressure block assembly 5, which adjusts the mold closing clearance to control the edge pressing effect. The lower mold 1 includes a U-shaped mounting slot for mounting the lower mold on the liquid forming machine tool's worktable. The lower mold 1 includes a centerline to ensure it can be mounted in the center of the machine tool's worktable, controlling force balance. The lower mold 1 includes three equipment reference holes, which serve as measurement references for inspection and maintenance. The plane of the equipment reference holes is slightly lower than the mold closing plane to prevent wear on the references during use, which could affect later measurement accuracy.

[0031] The upper die 2 includes a clamping area, which, together with the clamping area of ​​the lower die, clamps the part, forming a liquid chamber space between the sheet metal and the upper die. The upper die has an arc-shaped surface, which allows the sheet metal to be bent during the die-closing stage, simplifying the process and reducing the size of the liquid chamber space, thus improving the utilization rate and pressurization efficiency of the pressure medium. The clamping area of ​​the upper die 2 has a sealing groove for installing the sealing strip 6, which, during use, adheres to the upper surface of the sheet metal, providing a seal between the clamping area of ​​the upper die and the sheet metal, thereby increasing the liquid chamber pressure. The upper die 2 includes a pressure-bearing surface, which, during die-closing, adheres to the pressure-bearing block installed in the lower die, protecting the die surface and adjusting the die-closing clearance. The upper die 2 includes a filling port and a filling outlet, which inject pressure medium into the liquid chamber to increase the liquid chamber pressure. The filling port connects to the high-pressure filling connector 7; the upper die 2 includes a U-shaped slot for connecting to the machine tool drawing slide. The upper die includes a guide surface, a datum, and a centerline, whose functions are the same as the corresponding parts of the lower die.

[0032] The material storage module I10 includes 5 material storage bumps 10a-10e and 10 cylindrical pins 10f. The thickness of the material storage bumps 10a-10e is slightly lower than that of the part's reinforcing rib by about 1-10mm. The size of the material storage bumps 10a-10e is smaller than the size of the corresponding cavity of the lower mold 1. During operation, the bottom boundary of the bump is about 20-30mm away from the edge of the part. Its function is to ensure that the part's reinforcing rib is formed first. During operation, the material storage bumps are assembled into the cavity of the lower mold 1 using cylindrical pins. Its function is to ensure that material can be stored in the cavity during the first stage of part forming, so as to ensure sufficient material supply during the later forming of the reinforcing rib root. The material storage bump 11 comprises 5 material storage bumps 11a-11e and 10 cylindrical pins 11f. The thickness of the material storage module II 11 is 0.5 times that of the material storage bump 10. The dimensions of the material storage bumps 11a-11e are smaller than the corresponding cavity dimensions of the lower mold 1. During operation, the bottom boundary of the bump is approximately 40-60mm from the edge of the part. During the second stage of liquid filling, the material storage module II 11 replaces the material storage module I 10 and is installed in the cavity of the lower mold. Its function is to maintain a certain material storage height, allowing the material stored in the first stage to flow towards the root of the reinforcing rib under the action of the pressure medium, while controlling the amount of material absorbed to prevent wrinkles caused by excessively rapid absorption. Specifically, the material storage bump is a metal block with a trapezoidal cross-section. The curvature of its bottom surface is consistent with the curvature of the corresponding cavity of the lower mold 1. Each material storage bump includes two pin holes for assembly with the lower mold and one threaded hole for installing a lifting ring for easy loading and unloading. There is a venting groove at the bottom of the storage bump that runs through the entire bump. During operation, excess air enters the venting hole of the lower mold 1 through the venting groove and is then discharged from the equipment.

[0033] During operation, the guide mechanism 4 and the pressure-bearing component 5 are first installed in the corresponding positions of the mold. The lower mold 1 is fixed to the machine tool table through the mounting slot, and the upper mold 2 is connected to the machine tool sliding block. The material storage module I 10 is installed in the corresponding cavity of the lower mold 1 to form a transition surface A with material storage function. Then, the sheet metal is positioned in the lower mold; when the mold is closed, the sheet metal is bent by the arc-shaped surface of the upper mold 2. Then, the first stage of liquid filling is performed. Under the action of the pressure medium, the sheet metal will be pressed into the gap between the material storage protrusion and the reinforcing rib, thus completing the first step of material storage. In the second stage of forming, the material storage module I 10 is disassembled and the material storage module II 11 is installed to form the second set of transition surfaces B. Since the size of the protrusion of the material storage module II 11 is reduced, under the action of the pressure medium, part of the material stored in the first stage will be absorbed and replenished to the root of the reinforcing rib. In the third stage of forming, the material storage module II 11 is disassembled to form the final surface C. After further liquid filling and forming, the excess is removed to obtain a large multi-ribbed deep cavity sheet metal part.

[0034] This invention addresses the problem that the reinforcing ribs are prone to cracking at the root due to material shortage during conventional forming methods. Specifically, it designs a large-scale, multi-ribbed, deep-cavity aircraft sheet metal part pre-storage liquid filling forming device. It utilizes a flexible medium semi-mold forming method to avoid rigid impact on the sheet metal, thereby improving part quality and manufacturing efficiency. It also develops a material storage function during the forming process to solve the problem of material shortage at the root of the reinforcing ribs and designs a flexible material storage module to save transition costs.

[0035] The above specific embodiments or examples are only used to explain the technical solutions of this utility model and are not intended to limit this application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of this application, adaptive modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications, equivalent substitutions, and adaptive improvements do not depart from the technical essence of this utility model and should all be covered within the protection scope of this application.

Claims

1. A large multi-joint deep cavity aircraft sheet metal part pre-accumulation fluid forming device, characterized in that, It comprises a lower die, an upper die, guide posts, a plurality of guide mechanisms, a plurality of pressure-bearing components, a sealing strip, a high-pressure liquid filling connector assembly, a storage module I, and a storage module II. In the lower die, a part reinforcing rib forming area and a part flange edge forming area are included, the reinforcing rib forming area is divided into a plurality of cavities, and each cavity is matched with the storage module I and the storage module II when forming a part; the lower die includes a blank holder area that, when in use, clamps the part together with the blank holder area of the upper die to play a blank holding role; the lower die is provided with guide mechanism installation positions for installing guide mechanism components and forming a guide with the guide surface of the upper die; the lower die is provided with pressure-bearing block installation positions for installing pressure-bearing block components to adjust the gap between the upper and lower dies to control the blank holding effect; the upper end surface of the lower die is also fixed with guide posts for guiding when the upper and lower dies are closed; In the upper die, a blank holder area matched with the lower die is included, which, when in use, clamps the part together with the blank holder area of the lower die to form a liquid chamber space between the sheet metal and the upper die; the blank holder area of the upper die is provided with a sealing groove for installing a sealing strip, which, when in use, is attached to the upper surface of the sheet metal to play a sealing role between the blank holder area of the upper die and the sheet metal; The upper die also includes a pressure-bearing surface that, when the dies are closed, is attached to the pressure-bearing block installed in the lower die to protect the die surface and adjust the gap between the dies; the upper die includes a liquid filling port and a liquid filling outlet, which function to inject pressure medium into the liquid chamber to increase the pressure in the liquid chamber; the liquid filling port is connected to the high-pressure liquid filling connector.

2. A large multi-stiffened deep-cavity aircraft sheet metal part pre-die forming apparatus as claimed in claim 1, wherein, The cavities in the lower die are provided with exhaust holes.

3. A large multi-stiffened deep-cavity aircraft sheet metal part pre-die forming apparatus as claimed in claim 1, wherein, The storage module I and the storage module II each include a plurality of storage protrusions and cylindrical pins matched with the storage protrusions, which, when in use, fix the storage protrusions in the cavities of the lower die using the cylindrical pins.

4. A large multi-stiffened deep-cavity aircraft sheet metal part pre-die forming apparatus as claimed in claim 1, wherein, The upper surface of the guide plate is provided with a plurality of small blind holes that, when in use, are filled with lubricating grease to play a guiding and lubricating role during the opening and closing of the die.

5. A large multi-stiffened deep-cavity aircraft sheet metal part pre-die forming apparatus as claimed in claim 1, wherein, The upper die adopts an arc-shaped surface that, during use, can bend the part sheet metal during the closing of the dies.

6. A large multi-stiffened deep-cavity aircraft sheet metal part pre-die forming apparatus as claimed in claim 1, wherein, The lower die includes a device reference hole that serves as a measurement reference for the lower die.

7. A large multi-stiffened deep-cavity aircraft sheet metal component pre-die forming apparatus as claimed in claim 6, wherein, The lower die includes a centering line that functions to ensure that the lower die can be installed at the center of the machine tool table and to control the force balance.

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