A skin skeleton structure press-welding tool and a method of using the same

Abstract

This invention discloses a pressure-fitting welding fixture for a skin frame structure and its usage method. The fixture includes side fixtures, profile fixtures, and a mounting plate. The mounting plate is located at the bottom, with two side fixtures located at opposite ends of the upper surface of the mounting plate. The profile fixture is positioned between the two side fixtures and mounted on the upper surface of the mounting plate. During welding, multiple profile fixtures are first fitted onto the workpiece one by one. The skin frame structure is located between the profile frame and the pressure seam structure. The top and bottom screws of the profile fixtures are tightened. The multiple profile fixtures are evenly arranged and fixed along the long side of the workpiece. The workpiece, along with three profile fixtures, is lifted and mounted on the mounting base. The two side fixtures are then mounted at opposite ends of the mounting base, fitted under the workpiece, and the workpiece is tightened. Pressure welding is then performed. This invention facilitates welding and comprehensively solves the assembly and welding manufacturing difficulties of complex profile skin frame structures.

Description

Technical Field

[0001] This invention relates to a pressing and welding fixture for a skin frame structure and its application method, belonging to the technical field of welding assembly fixtures. Background Technology

[0002] With the rapid development of aerospace and other manufacturing fields, the requirements for structures are becoming increasingly stringent, demanding higher strength materials and lightweight design. Lightweight structures are achieved through optimization in design, topology, shape, and dimensions. This includes comprehensive structural optimization by considering factors from multiple disciplines, using topology methods to make structures more rational to save space, improving structural stiffness and modalities through shape optimization, and adjusting the cross-sectional shape and size of components through dimensional optimization to reduce wall thickness. Overall, the requirements for structural shape, strength, and lightweighting are becoming increasingly stringent, and the structures of high-end equipment are becoming increasingly scientific from design to manufacturing. Faced with the ever-increasing demands of industrial development on structural forms, lightweighting, high strength, durability, and rational structural configurations are gradually becoming new research hotspots.

[0003] The skeleton and skin structure can effectively reduce weight while maintaining a certain strength, making it an effective means of lightweighting. It not only achieves lightweighting but also meets the requirements of high strength and durability when using advanced high-strength materials. Therefore, high-strength material skeleton and skin structures have become a research hotspot in the structural engineering field. However, the general structure shape is quite complex, and the surface may not be a typical plane; at the same time, the skeleton and skin need to be assembled together, resulting in numerous assembly points; due to the complexity of the structure, many assembly processes are also complex, requiring specialized assembly tooling; many skins and skeletons need to be welded together after assembly, requiring both pressing and easy welding; furthermore, while the skeleton and skin structure is designed to ensure a certain strength, the force and stroke applied during assembly are limited, and excessive force may cause local deformation and structural damage. While designing skeleton and skin structures to achieve complex shapes and lightweighting, manufacturing faces many of the above-mentioned challenges. Solving these problems is urgently needed. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a pressure welding fixture for skin skeleton structure and its usage method. This fixture solves the assembly difficulties while facilitating welding, thus solving the overall assembly and welding manufacturing difficulties of complex surface skin skeleton structures. It has broad application prospects in lightweight skin skeleton structures in aerospace, mobile vehicles and ships.

[0005] The technical solution of the present invention is as follows: Firstly, a skin frame structure press-fit welding fixture is provided, comprising: a side fixture, a profile fixture, and a mounting plate. The mounting plate is located at the bottom, two side fixtures are respectively located at both ends of the upper surface of the mounting plate, and the profile fixture is located between the two side fixtures and mounted on the upper surface of the mounting plate; wherein:

[0006] Side fixtures and profile fixtures are similar in shape to the workpiece and are used to fix the workpiece, facilitating its assembly and welding.

[0007] Preferably, the workpieces for which the tooling is applicable are:

[0008] The whole is composed of a skin frame. The internal support structure is composed of a frame structure, and the outside is skin. There are mounting blocks at each end of the frame. The skin has small rectangular openings. The mounting blocks and the small rectangular openings are welded together to form a whole.

[0009] The final assembled workpiece has an approximately trapezoidal cross-section, with a semi-circular top edge and a rectangular front, and a uniform cross-section perpendicular to the long side of the rectangle.

[0010] Preferably, the side tooling is as follows:

[0011] The side fixture is 30cm ± 5cm larger than the outer contour of the workpiece. There is a reinforcing rib at the lower part of the center of symmetry. The side fixture is evenly distributed with threaded holes and equipped with set screws, which are used to adjust the position of the set screws during assembly to tighten the workpiece.

[0012] Preferably, the profile tooling includes: a profile frame, a pressing structure, a pressing structure, an mounting tail block, a welding waist hole, a tail screw, and an end screw;

[0013] The overall outline of the profile tooling is 30cm ± 5cm larger than the workpiece. The upper inner side is equipped with a pressure seam structure that conforms to the shape of the workpiece. The fit between the pressure seam structure and the workpiece is controlled by a set screw. The top and root of the profile tooling are respectively equipped with end set screws and tail set screws to adjust the tightness of pressing the workpiece.

[0014] Multiple elongated holes are symmetrically arranged on the profile frame for installing the press-fit structure.

[0015] Preferably, the press-fit structure is installed on the elongated hole of the profile frame and can be adjusted in position along the axial direction of the elongated hole, including a press-fit block, a guide seat and an adjusting screw;

[0016] The guide seat has three through holes arranged on it. Two pressing blocks are installed in the two through holes at both ends of the guide seat, which serve as guide structures. The adjusting screw is located in the through hole in the middle of the guide seat, which can adjust the distance between the pressing block and the guide seat, so as to press the skin and the skeleton structure together.

[0017] Preferably, the mounting plate is a rectangular plate with two elongated holes parallel to the long side of the rectangular plate for mounting surface fixtures, and the two ends are connected to side fixtures;

[0018] Multiple profiled fixtures can be mounted on the mounting plate, and the position of the profiled fixtures can be flexibly adjusted during press welding.

[0019] Secondly, a method for using a pressure-fitting and welding fixture for a skin frame structure is provided, including:

[0020] When using tooling to assist welding, first, multiple shaped toolings are placed over the workpiece one by one, and the multiple shaped toolings are evenly arranged along the long side of the workpiece. After the skin frame structure is located inside the shaped frame, the top and bottom screws of the shaped tooling are tightened. The height of the pressing structure on the shaped tooling is adjusted according to the position of the workpiece mounting block hole and the welding point of the frame. The fit between the pressing structure and the workpiece is adjusted by controlling the top screws, thereby fixing the workpiece and the shaped tooling.

[0021] Lift the workpiece with the three profiled fixtures and mount it on the mounting plate; adjust the position of the profiled fixtures on the mounting plate according to the press-fit welding position;

[0022] Install the two side fixtures on both ends of the mounting plate, adjust the top screws distributed on the side fixtures, and press the skin skeleton workpiece from both ends of the workpiece. Then, adjust the position and degree of pressing of the pressing structure according to the pressing and welding parts, and perform pressing and welding.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) The present invention adopts a modular design. The side tooling, the profile tooling and the mounting plate are relatively independent, but can also form an organic whole. In addition to completing the pressing function of each part, they can also jointly complete the pressing of the whole and assist welding. While solving the assembly difficulties, it can also facilitate welding. The overall solution solves the assembly and welding manufacturing difficulties of complex profile skin skeleton structure. It has a wide application prospect in the lightweight structure of skin skeleton in the fields of aerospace, mobile vehicles and ships.

[0025] (2) The press-fitting structure in this invention is installed on the elongated oval slot of the profile frame and can move along the elongated oval slot, which not only realizes the position adjustment but also facilitates welding after press-fitting. At the same time, the press-fitting block can adjust the distance between itself and the guide seat under the action of the set screw, thereby realizing the assembly of the skin and the skeleton and facilitating subsequent welding;

[0026] (3) The side tooling in this invention adopts an outer contour shape similar to that of the workpiece, and the shape is slightly smaller than that of the workpiece. A set screw is installed around the edge, which tightens the workpiece without affecting the welding of the outer edge. Attached Figure Description

[0027] Figure 1A schematic diagram of a skeleton skin press-fit welding fixture provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the specific structure of the profile tooling provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the press-fit structure provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the workpiece to which the tooling of this invention is applicable. Detailed Implementation

[0031] In view of the above-mentioned manufacturing difficulties, when manufacturing a skeleton skin structure, after the individual components are completed, the final step is to assemble and weld them as a whole. This invention provides a new type of tooling that can not only assist in assembly, but also effectively apply force and control the assembly tightness, and facilitate welding.

[0032] The workpiece to which this invention's tooling is applicable is specifically: It consists of a skin-like skeleton as a whole, with an internal main support structure composed of a skeleton structure. The exterior of the structure is composed of protruding blocks and an outer skin assembled and welded together as a whole structure. The outer surface is the skin, and the interior is the assembled skeleton. Each end of the skeleton has a mounting block. The skin has small rectangular openings through which the mounting blocks protrude, and the entire structure is integrally formed by welding. The external shape is approximately trapezoidal in cross-section, thicker at the base and thinner at the top, with the top edge becoming semi-circular. The front is rectangular, with a uniform cross-section perpendicular to the long side of the rectangle. Final assembly requires pressing the mounting blocks together and welding them to complete the overall welding and shaping.

[0033] This invention provides a skin frame structure press-fit welding fixture, comprising: a side fixture 1, a profile fixture 2, and a mounting plate 3. The profile fixture 2 consists of a profile frame 2-1, a press-fit structure 2-2, a seam pressing structure 2-3, a mounting tail block 2-4, a welding waist hole 2-5, a tail screw 2-6, and an end screw 2-7. The press-fit structure 2-2 consists of a press-fit block 2-2-1, a guide seat 2-2-2, and an adjusting screw 2-2-3.

[0034] The side fixture 1 is similar in shape to the workpiece, with a rectangular section at the bottom and a domed triangle section at the top middle. It is approximately 30cm ± 5cm larger than the workpiece's outer contour. A reinforcing rib is located at the lower part of the symmetrical center. The side fixture 1 has a ring of threaded holes following the shape of the workpiece, and is fitted with evenly distributed set screws. During assembly, the position of the set screws can be adjusted to tighten the workpiece, facilitating assembly and welding.

[0035] Mounting plate 3 is a rectangular plate with two elongated holes in the middle for mounting profile fixtures 2, and both ends connected to side fixtures 1. Multiple profile fixtures 2 can be mounted, and the position of the profile fixtures 2 can be flexibly adjusted during press welding, enabling the various parts of the workpiece to be connected into an organic whole.

[0036] The shape of the profile fixture 2 is similar to that of the workpiece, roughly a domed triangle with a semi-circular top edge. Its overall outline is 30cm ± 5cm larger than the workpiece. A pressure seam structure 2-3, conforming to the workpiece shape, is installed on the inner side of its upper end, and set screws control the fit between the pressure seam structure 2-3 and the workpiece. Set screws are installed at both the top and base to tighten the workpiece at these locations. Symmetrical elongated holes are opened on the profile frame 2-1 to facilitate the installation of the pressure fitting structure 2-2. The press-fit structure 2-2 is installed on the elongated hole of the profile frame 2-1 and its position can be adjusted along the elongated hole. The guide seat 2-2-2 has a guide structure and can install the press-fit block 2-2-1. The guide seat 2-2-2 has three through holes arranged on it. The two press-fit blocks 2-2-1 are respectively installed in the two through holes at both ends of the guide seat 2-2-2, which serve as guide structures. The adjusting screw 2-2-3 is located in the through hole in the middle of the guide seat 2-2-2. Adjusting the adjusting screw 2-2-3 can adjust the distance between the press-fit block 2-2-1 and the guide seat 2-2-2, thereby realizing the press-fitting of the skin and the skeleton structure.

[0037] The preferred shapes of the side fixture 1 and the profile fixture 2 are the same as the workpiece shape, only differing in size.

[0038] The method of using the skin frame structure press-fit welding fixture is as follows:

[0039] During tooling-assisted welding, first, place the three profile tooling 2 onto the workpiece one by one. The skin frame structure is located inside the profile frame 2-1. Then, tighten the set screws at the top and bottom of the profile tooling 2 to evenly fix the three profile tooling 2 in the left, center, and right positions of the workpiece. Next, lift the workpiece with the three profile tooling and install it on the mounting plate 3. Then, install the two side tooling 1 on both ends of the mounting plate and adjust the set screws on the side tooling 1 to tighten the workpiece. After that, press-fitting and welding can be performed. The press-fitting structure 2-2 on the profile tooling 2 can be adjusted in height according to the position of the workpiece mounting block hole and the welding point of the frame. At the same time, the profile tooling can also be adjusted in position on the mounting plate according to the press-fitting and welding position. The set screws evenly distributed on the side tooling 1 can be adjusted in tightness according to the press-fitting and welding position. After adjusting the appropriate press-fitting force, the welding operation can be performed.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A pressure welding fixture for a skin frame structure, characterized in that... include: Side fixture (1), profile fixture (2), and mounting plate (3). The mounting plate (3) is located at the bottom. The two side fixtures (1) are located at both ends of the upper surface of the mounting plate (3). The profile fixture (2) is located between the two side fixtures (1) and installed on the upper surface of the mounting plate (3). The side fixture (1) and the profile fixture (2) are similar in shape to the workpiece and are used to fix the workpiece, which facilitates the assembly and welding of the workpiece. The side tooling (1) is evenly distributed with threaded holes and fitted with set screws, which are used to adjust the position of the set screws during assembly to tighten the workpiece; the upper end of the profile tooling (2) is fitted with a pressure seam structure (2-3) that conforms to the shape of the workpiece, and the fit between the pressure seam structure (2-3) and the workpiece is controlled by the set screws. The specific workpieces to which this tooling is applicable are: The whole is composed of a skin frame. The internal support structure is composed of a frame structure, and the outside is skin. There are mounting blocks at each end of the frame. The skin has small rectangular openings. The mounting blocks and the small rectangular openings are welded together to form a whole. The final assembled workpiece has an approximately trapezoidal cross-section with a semi-circular top edge and a rectangular front, and a uniform cross-section perpendicular to the long side of the rectangle. The profile tooling (2) includes: profile frame (2-1), press-fit structure (2-2), mounting tail block (2-4), welding waist hole (2-5), tail set screw (2-6) and end set screw (2-7); The overall outline of the profile tooling (2) is 30cm ± 5cm larger than the outline of the workpiece; the top and root of the profile tooling (2) are respectively equipped with end set screws (2-7) and tail set screws (2-6) to adjust the tightness of the press-fitting workpiece; Multiple elongated holes are symmetrically arranged on the profile frame (2-1) for installing the press-fit structure (2-2).

2. The skin frame structure press-fit welding fixture according to claim 1, characterized in that: The side tooling (1) is specifically as follows: The side tooling (1) is 30cm ± 5cm larger than the outer contour of the workpiece, and has a reinforcing rib at the lower part of the center of symmetry.

3. The skin frame structure press-fit welding fixture according to claim 1, characterized in that: The press-fit structure (2-2) is installed on the elongated hole of the profile frame (2-1) and can be adjusted along the axial direction of the elongated hole. It includes a press-fit block (2-2-1), a guide seat (2-2-2), and an adjusting screw (2-2-3). The guide seat (2-2-2) has three through holes arranged on it. Two pressing blocks (2-2-1) are respectively installed in the two through holes at both ends of the guide seat (2-2-2) as guide structures. The adjusting screw (2-2-3) is located in the through hole in the middle of the guide seat (2-2-2), which can adjust the distance between the pressing block (2-2-1) and the guide seat (2-2-2) to press the skin and the skeleton structure.

4. The skin frame structure press-fit welding fixture according to claim 1, characterized in that: The mounting plate (3) is a rectangular plate with two elongated holes parallel to the long side of the rectangular plate for mounting the surface fixture (2), and the two ends are connected to the side fixture (1). Multiple profile tooling (2) can be installed on the mounting plate (3), and the position of the profile tooling (2) can be flexibly adjusted during press welding.

5. A method of using the skin frame structure press-fit welding fixture as described in claim 1, characterized in that... include: When the tooling is used for welding, multiple surface tooling (2) are first placed on the workpiece one by one, and the multiple surface tooling (2) are evenly arranged along the long side of the workpiece. After the skin frame structure is located inside the surface frame (2-1), the top screws at the top and bottom of the surface tooling (2) are tightened. The height of the pressing structure (2-2) on the surface tooling (2) is adjusted according to the position of the workpiece mounting block hole and the welding point of the frame. The fit between the pressing structure (2-3) and the workpiece is adjusted by controlling the top screws, thereby fixing the workpiece and the surface tooling (2). Lift the workpiece with the three profile fixtures and install it on the mounting plate (3); adjust the position of the profile fixture (2) on the mounting plate according to the press-fit welding position; Install the two side fixtures (1) on both ends of the mounting plate, adjust the top screws distributed on the side fixtures, press the skin skeleton workpiece from both ends of the workpiece, and then adjust the position and pressing degree of the pressing structure (2-2) according to the pressing and welding part, and perform pressing and welding.

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