A grid structure for wing rudders and its forming process

Abstract

This invention relates to a radiator grid structure and its forming process, belonging to the field of welding technology. It solves the problem that existing technologies lack suitable grid structures for radiator products, making it impossible to form open areas and thus hindering the lightweighting of radiator products. The radiator grid structure includes grid plates and baffles, with the baffles sequentially connected to form a closed loop. The grid plates are inserted into the internal space formed by the baffles to form open areas, and the ends of the grid plates are fixedly connected to the baffles. This invention achieves lightweighting of products in the aerospace field.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a grid structure for rudders and its forming process. Background Technology

[0002] Achieving lightweighting of products in the aerospace field is a perennial theme, especially in recent years with the rapid development of aerospace vehicles, which has made the demand for lightweighting of the main structure of the vehicles increasingly urgent.

[0003] As an important component of aerospace vehicles, wing-shaped rudder products often need to have impact resistance and high temperature resistance. In the industrial production field, the weight reduction effect is often achieved by combining lightweight alloys with lightweight structures. Currently, magnesium, aluminum and titanium alloys are commonly used structural materials among lightweight metal alloys. Titanium alloys are widely used in the aerospace field due to their excellent high temperature resistance.

[0004] To achieve lightweight design for wing-type components, a grid structure with openwork can be used. However, existing technologies lack suitable grid structures for wing-type products, making it impossible to create openwork areas and thus hindering lightweight design. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a grid structure for wing rudders and its forming process, in order to solve the problem that there is no grid structure suitable for wing rudder products in the prior art, which makes it impossible to form hollow areas and thus prevents wing rudder products from achieving lightweighting.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] On one hand, the present invention provides a grid structure for a wing rudder, including a grid plate and a baffle, wherein the baffles are sequentially connected to form a closed loop; the grid plate is inserted into the internal space formed by the baffle to form a hollow area, and the end of the grid plate is fixedly connected to the baffle.

[0008] Optionally, the grid plate is provided with an opening slot, the opening slot extending through the thickness direction of the grid plate; the depth of the opening slot is equal to half the width of the grid plate; the number of opening slots is multiple, and the multiple opening slots are distributed along the length direction of the grid plate.

[0009] Optionally, the width of the opening slot is greater than the thickness of the grid plate.

[0010] Optionally, the end of the grid plate includes a flat end and a beveled end; the flat end means that the end face of the grid plate is perpendicular to the main body of the grid plate, and the beveled end means that the end face of the grid plate is at a certain angle to the main body of the grid plate.

[0011] Optionally, one end of the grid plate is a flat end, and the other end is a beveled end.

[0012] Optionally, both ends of the grid plate are beveled ends.

[0013] Optionally, the grid plate is made of aluminum alloy or titanium alloy.

[0014] Optionally, the length of the grid plate is 800-1000mm.

[0015] Optionally, the width of the grid plate is 90-100mm.

[0016] On the other hand, the present invention also provides a method for processing a grid plate to obtain the above-mentioned grid plate, comprising the following steps:

[0017] Step 1: Cut the grid panels to the predetermined size;

[0018] Step 2: Cut openings at regular intervals on the grid plate;

[0019] Step 3: Process the ends of the grid plate.

[0020] Furthermore, the present invention also provides a grid structure forming process for forming the above-mentioned grid structure, comprising the following steps:

[0021] Step a: Use assembly fixtures to test assemble the grid plate and the baffle plate;

[0022] Step b: Pickling;

[0023] Step c: Welding to obtain the grid structure.

[0024] An assembly fixture is used to assist in assembling multiple grid panels together. The assembly fixture includes a frame; the frame has a hollow area to reduce weight; the hollow area includes multiple hollow units, and gaps are provided between adjacent hollow units. The multiple gaps are connected to form a slot for placing the grid panel.

[0025] Optionally, the card slot includes a first card slot and a second card slot, which are arranged intersectingly, with the intersection being the opening slot on the grid plate.

[0026] Optionally, there are multiple first card slots and multiple second card slots, and the multiple first card slots and multiple second card slots are arranged in parallel.

[0027] Optionally, the width of the slot is greater than the thickness of the grid plate.

[0028] Optionally, the width of the slot is 0.1-0.2 mm greater than the thickness of the grid plate.

[0029] Optionally, the hollow unit includes four upright plates, which are connected in sequence to form a hollow cuboid.

[0030] Optionally, the height of the upright plate is half the width of the grid plate.

[0031] Optionally, the cross-section of the hollowed-out unit is cross-shaped.

[0032] Optionally, the frame is provided with a limiting block, which is located on the outside of the hollow area.

[0033] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0034] (1) The grid plate of the present invention has the characteristics of having a deep cavity (the width of the grid plate is 90-100mm), a large size (the length of the grid plate is 800-1000mm), and a thin wall (the thickness of the grid plate is <5mm). By setting an opening slot on the grid plate and controlling the size of the opening slot, multiple grid plates can be interconnected to form a hollow structure, thereby achieving the lightweighting of the rudder.

[0035] (2) The present invention provides a special assembly tooling for the structure of the grid plate, which can play a constraining role in the grid plate assembly process and effectively reduce the welding deformation in the subsequent welding process, thus creating good conditions for subsequent assembly and ultimately ensuring the dimensional accuracy of the entire grid wing.

[0036] (3) Due to the unique characteristics of the grid plate of the present invention, such as deep cavity (grid plate width is 90-100mm), large size (grid plate length is 800-1000mm), thin wall (grid plate thickness < 5mm), and numerous welds (dozens or even hundreds of welds), there are technical challenges such as large welding deformation and low product dimensional accuracy. Through technological innovation, the present invention employs a specific welding sequence in the full welding of the grid plate: first the central weld, then the peripheral welds; and a welding sequence within each group of peripheral welds: first weld two welds in a centrally symmetrical position. This effectively prevents welding deformation, facilitates subsequent assembly, and ensures the dimensional accuracy of the entire grid wing, resulting in a high product qualification rate. Furthermore, the forming process of the present invention is simple, easy to implement, and does not require special forming equipment.

[0037] (4) By setting the height of the upright plate in the hollow unit to half the width of the grid plate, the present invention can stabilize the grid plate and prevent the grid plate from being inserted due to the excessive height of the upright plate.

[0038] (5) By setting upward reinforcing protrusions on the upper surface of the upright plate and setting the length of the reinforcing protrusions to be less than the length of the upright plate, the present invention can not only enhance the stability of the grid plate, but also reduce the amount of material used in the upright plate and save costs.

[0039] (6) By controlling the sum of the height of the reinforcing protrusion and the height of the upright plate to be one-half to two-thirds of the width of the grid plate, the present invention further improves the stability of the grid plate without affecting the insertion of the grid plate.

[0040] (7) By setting a limiting block, the present invention can better maintain the shape of the internal space enclosed by the baffle, maintain the structural stability of the hollow area, and thus ensure the dimensional accuracy of the grid plate.

[0041] (8) By setting a limiting block and connecting the four vertical plates of the hollow unit in sequence to form a cuboid, the present invention can play a constraining role in the annealing process, so that the dimensional accuracy of the grid plate is well controlled after annealing.

[0042] (9) By setting protrusions on the baffle and at the cross welding points of the grid plates, the present invention can achieve smooth docking between the grid plates and the baffles, avoid interference between the end face of the grid plates and the baffles, and facilitate assembly and welding.

[0043] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or may be learned by practicing the invention. Attached Figure Description

[0044] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0045] Figure 1 This is a schematic diagram of the grid plate structure of the present invention;

[0046] Figure 2(a) is a schematic diagram of the structure of the grid plate of the present invention, which has a flat end at one end and a beveled end at the other end;

[0047] Figure 2(b) is a schematic diagram of the structure of the grid plate of the present invention, where both ends are beveled.

[0048] Figure 3 This is a schematic diagram of the assembly tooling structure of the present invention;

[0049] Figure 4 This is a diagram showing the full welding sequence of the present invention;

[0050] Figure 5(a) shows one type of joint between the grid plate and the baffle of the present invention;

[0051] Figure 5(b) shows another joint form of the grid plate and baffle of the present invention;

[0052] Figure 6 This is a schematic diagram of the structure of the baffle plate of the present invention having a boss;

[0053] Figure 7 This is a schematic diagram of another form of the hollowed-out area of ​​the assembly tooling of the present invention.

[0054] Figure label:

[0055] 1-Grid plate; 2-Baffle; 3-Frame; 4-Upright plate; 5-Reinforcing protrusion; 6-Opening slot; 7-Connecting part; 8-Supporting part; 9-Boss; 10-Limiting block; 11-First weld; 12-Second weld; 13-Third weld; 14-Fourth weld; 15-Fifth weld; 16-Sixth weld; 17-Seventh weld; 18-Eighth weld; 19-Ninth weld; 20-Tenth weld; 21-Eleventh weld; 22-Twelfth weld; 23-Thirteenth weld; 24-Fourteenth weld; 25-Fifteenth weld; 26-Sixteenth weld; 27-Seventeenth weld; Z-Laser welding direction; H1-Depth of opening slot; H2-Width of grid plate; W-Width of opening slot; α-Angle. Detailed Implementation

[0056] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0057] Example 1

[0058] One specific embodiment of the present invention discloses a grid structure for wing rudders, which is used to form grid wing rudders, thereby achieving lightweighting of products in the aerospace field.

[0059] The grid structure includes multiple baffles 2 and multiple grid plates 1. The multiple baffles 2 are connected in sequence to form a closed loop; the multiple grid plates 1 are inserted into the internal space formed by the baffles to form a hollow area, and the ends of the grid plates are welded to the baffles.

[0060] like Figure 1As shown, the grid plate 1 in this embodiment has the characteristics of deep cavity (grid plate width is 90-100mm), large size (grid plate length is 800-1000mm), and thin wall (grid plate thickness < 5mm). The grid plate 1 is a sheet-like cuboid, and multiple opening slots 6 are distributed on the grid plate 1 along its length direction. The opening slots 6 extend along the thickness direction of the grid plate 1, the depth H1 of the opening slots 6 is equal to half the width H2 of the grid plate, and the width W of the opening slots 6 is equal to the thickness of the grid plate 1.

[0061] Specifically, the grid plate 1 is made of aluminum alloy or titanium alloy, with a length of 800-1000mm and a width of 90-100mm.

[0062] To facilitate subsequent assembly, the ends of the grid plate 1 come in various forms. As shown in Figure 2, the ends of the grid plate 1 include flat ends and beveled ends. A flat end means that the end face of the grid plate 1 is perpendicular to the main body of the grid plate 1, while a beveled end means that the end face of the grid plate 1 forms a certain angle α with the main body of the grid plate 1. The value of α is greater than 90°, for example, 135°.

[0063] Specifically, as shown in Figures 2(a) and 2(b), the grid plate 1 can have one end with a flat end and the other end with a beveled end; or both ends can be beveled ends.

[0064] In a preferred embodiment, in order to facilitate welding and prevent stress concentration, a boss 9 is provided on the baffle and at the intersection of the grid plates and the baffle, which can realize the smooth connection between the grid plates and the baffle, avoid interference between the end face of the grid plate and the baffle, and facilitate assembly and welding.

[0065] In addition, such as Figure 3 As shown, a connecting part 7 is provided on one of the baffles in the width direction of the grid structure to realize the connection between the grid structure and the aircraft.

[0066] Specifically, there are two connecting parts 7, which are respectively located at both ends of the baffle 2.

[0067] Example 2

[0068] One specific embodiment of the present invention discloses an assembly tooling for assisting in the assembly to obtain the grid structure of Embodiment 1.

[0069] like Figure 3 As shown, the assembly fixture in this embodiment includes a frame 3. The frame 3 has a hollowed-out area to reduce weight. The hollowed-out area includes multiple hollowed-out units, with gaps (not shown) between adjacent hollowed-out units. These gaps connect along the length of the grid plate 1, forming slots (not shown) for placing the grid plate 1.

[0070] In a preferred embodiment, the width of the slot is greater than the thickness of the grid plate 1. Specifically, the width of the slot is 0.1-0.2 mm greater than the thickness of the grid plate 1, so that the grid plate 1 can be smoothly inserted into the slot.

[0071] In one possible implementation, the card slot includes a plurality of first card slots and a plurality of second card slots, with the plurality of first card slots arranged in parallel and the plurality of second card slots also arranged in parallel. The plurality of first card slots and the plurality of second card slots are arranged intersectingly, with the intersection being an opening slot 6 provided on the grid plate 1.

[0072] Specifically, the hollow unit includes four upright plates 4, which are connected in sequence to form a hollow cuboid. Each upright plate 4 has a certain height, which enhances the stability of the grid plate 1 between adjacent hollow units.

[0073] Considering that a height of the upright plate 4 that is too short cannot adequately stabilize the grid plate 1, while a height that is too high makes it difficult to place the grid plate 1 with its opening facing upwards into the slot of the assembly fixture, and also makes it difficult to insert the grid plate 1 with its opening facing downwards into the grid plate 1 with its opening facing upwards. In a preferred embodiment, the height of the upright plate 4 is half the width of the grid plate 1. This embodiment, by controlling the height of the upright plate 4, can both stabilize the grid plate 1 and prevent the grid plate 1 from being inserted due to excessive height.

[0074] Furthermore, each upright plate 4 has an upward reinforcing protrusion 5 on its upper surface, further enhancing the stability of the grid plate 1 between adjacent tooling units. Specifically, the length of the reinforcing protrusion 5 is less than the length of the upright plate 4, and the width of the reinforcing protrusion 5 is equal to the width of the upright plate. This embodiment, by providing upward protrusions on the upper surface of the upright plates and setting the length of the protrusions to be less than the length of the upright plates, can both enhance the stability of the grid plate and reduce the amount of upright plate material used, thus saving costs.

[0075] Specifically, the sum of the height of the reinforcing protrusion and the height of the upright plate is one-half to two-thirds of the width of the grid plate. This embodiment further improves the stability of the grid plate by controlling the sum of the height of the protrusion and the height of the upright plate to be one-half to two-thirds of the width of the grid plate, without affecting the insertion of the grid plate. For example, the upright plate is made of cast iron.

[0076] In addition, each upright plate 4 has more than one reinforcing protrusion 5, so that when the distance between adjacent opening slots 6 on the grid plate is large, the grid plate 1 can still maintain stability after being placed on the assembly fixture.

[0077] In another specific implementation, such as Figure 3 As shown, the frame 3 is provided with a support part 8 to support the connecting part 7 in the grid structure.

[0078] In addition, such as Figure 3 As shown, the frame 3 is also provided with a limiting block 10. The limiting block 10 is located on the outside of the hollow area and is used to limit the baffle 2. This can better maintain the shape of the internal space enclosed by the baffle 2, maintain the structural stability of the hollow area, and thus ensure the dimensional accuracy of the grid plate.

[0079] Example 3

[0080] Another embodiment of the present invention also discloses an assembly fixture, such as Figure 7 As shown, the assembly fixture differs from the assembly fixture in Embodiment 2 in that the cross-section of the hollow unit in this embodiment is "+" shaped, and the four protruding parts of the "+" shape are respectively provided with gaps (not shown in the figure) between them and the protruding parts of the adjacent hollow unit. Multiple gaps are connected along the length direction of the grid plate 1 to form a slot (not shown in the figure) for placing the grid plate 1.

[0081] Considering that a low height of the cutout unit would not adequately stabilize the grid plate 1, while a high height would hinder the placement of the grid plate 1 with its opening facing upwards into the slot of the assembly fixture, and also make it difficult to insert the grid plate 1 with its opening facing downwards into the grid plate 1 with its opening facing upwards. In a preferred embodiment, the height of the cutout unit is one-half to two-thirds of the width of the grid plate 1. This embodiment, by setting the height of the cutout unit to one-half to two-thirds of the width of the grid plate, achieves both the stability of the grid plate and avoids the grid plate insertion being affected by an excessively high fixture unit.

[0082] Example 4

[0083] Another specific embodiment of the present invention discloses a grid structure forming process for wing rudders.

[0084] Wing rudder grids are often thin-walled parts (thickness < 5mm). They are difficult to form using integral casting, and subsequent integral machining of the blank is required. The lengthy production process can lead to high manufacturing costs and long cycle times. On the other hand, the method of inserting and welding metal sheets can use locally sourced materials, which has the advantages of short process preparation cycle and low cost. However, due to the product's requirement for lightweighting, the thickness of the grid plate is often required to be < 5mm. Therefore, the integral grid has the risk of a large number of welds and large welding deformation during the welding process.

[0085] Compared with traditional welding technology, laser welding is a non-contact welding method. It does not require pressure during operation and has the advantages of fast welding speed, high beam density, high strength, large weld depth-to-width ratio, small heat-affected zone, small workpiece deformation, less post-processing workload, high degree of freedom and high operability. Laser welding is very useful for cross-shaped grid rudders.

[0086] The forming process in this embodiment includes the following steps:

[0087] Step 1: Processing to obtain the grid plate 1 of Example 1 includes the following steps:

[0088] Step 11: Use laser cutting to obtain a grid plate 1 of a specific size.

[0089] Step 12: Cut opening slots 6 at regular intervals on the grid plate 1. The opening slots 6 extend through the thickness direction of the grid plate. The depth H1 of the opening slot is equal to half the width H2 of the grid plate, and the width W of the opening slot 6 is equal to the thickness of the grid plate.

[0090] It is important to emphasize that the width accuracy of the opening slot directly affects the assembly accuracy of the grid plate. In one specific implementation, the accuracy tolerance in the thickness direction of the grid plate is controlled to be 0.1-0.2mm, which makes the grid plate less prone to deformation after assembly and ensures high assembly accuracy.

[0091] Step 13: Process the ends of the grid plate.

[0092] Because the joints at the assembly positions of the grid plate 1 and the baffle 3 have different forms, the ends of the grid plate 1 need to be processed into different shapes. There are two main shapes: one is that one end of the grid plate is flat and the other end is a beveled edge; the other is that both ends are beveled edges. In this embodiment, by processing the ends of the grid plate into specific shapes, the assembly and welding of the grid plate and the baffle are facilitated.

[0093] For example, the bevel angle is 135°, that is, the angle between the hypotenuse and the straight edge of the grid plate is 135°.

[0094] Step 2: Trial assembly of the grid plate and baffle to ensure they do not interfere with each other. Step 21: Insert the grid plate with the opening facing upward into the slot of the assembly fixture, ensuring that the bottom of the grid plate opening is flush with the upper surface of the cutout unit during insertion;

[0095] Step 22: Take another grid plate, place it with the opening facing down, and mate it with the grid plate from Step 21. After the two grid plates are inserted, they should be flush and without protrusions. When assembling, start assembling the grid plates from the middle to both sides to ensure that no residual stress is generated after assembly.

[0096] Step 23: Grind and repair the grating plate that contacts the baffle, so that the gap between the beveled grating plate and the vertical plate does not exceed 0.1mm, and locally does not exceed 0.2mm. Then grind and repair the other right-angled edge to make it fit well with the baffle.

[0097] Step 3: Pickling.

[0098] After confirming that the components will not interfere with each other, remove the grid plate from the baffle and pickle the grid plate and baffle to remove surface oil and oxide scale.

[0099] Step 4: Tack welding

[0100] Before welding the grid panels, argon arc welding is used to position the cross grids of the intermediate grid panel joints and the contact points between the grid panels and the vertical plates. This fixes the relative positions of each part before welding, and greatly increases the overall rigidity of the structure before welding, effectively controlling local deformation and torsion that may occur between the intermediate grid panels and during the welding process between the grid panels and the vertical plates.

[0101] Argon gas protection is used during tack welding. The welding torch should be stopped 18 seconds later to ensure that the weld surface is silver-white or light yellow and not dark blue.

[0102] Step 5: Weld the grid plate

[0103] This process involves fully welding the grid plate that has already undergone tack welding in the previous step. Full welding is performed using laser welding. During welding, the grid plate is fixed to the welding fixture using a tool clamp. The laser welding joint is deflected at 45°, and arc welding begins at a position below half the grid plate's length until the entire weld seam is completed. Welding follows a specific order: first the center weld, then the peripheral welds. This specific welding sequence effectively prevents welding deformation.

[0104] Specifically, in order of distance from the center weld from near to far, the peripheral welds include the first group of peripheral welds, the second group of peripheral welds, the third group of peripheral welds, and so on.

[0105] like Figure 4 As shown, the central weld includes a first weld 11, and the first group of peripheral welds includes a second weld 12, a third weld 13, a fourth weld 14, and a fifth weld 15. Furthermore, the second weld 12 and the third weld 13, and the fourth weld 14 and the fifth weld 15 are respectively arranged symmetrically about the central weld.

[0106] The second group of peripheral welds includes the sixth weld 16, the seventh weld 17, the eighth weld 18, and the ninth weld 19, and the sixth weld 16 and the seventh weld 17, the eighth weld 18 and the ninth weld 19 are arranged in a centrally symmetrical manner about the central weld.

[0107] The third group of peripheral welds includes the tenth weld 20, the eleventh weld 21, the twelfth weld 22, the thirteenth weld 23, the fourteenth weld 24, the fifteenth weld 25, the sixteenth weld 26, and the seventeenth weld 27. The tenth weld 20 and the eleventh weld 21, the twelfth weld 22 and the thirteenth weld 23, the fourteenth weld 24 and the fifteenth weld 25, and the sixteenth weld 26 and the seventeenth weld 27 are arranged symmetrically about the central weld.

[0108] During the welding process, the first weld 1 at the center position is welded first, followed by the first group of peripheral welds, the second group of peripheral welds, and the third group of peripheral welds in sequence.

[0109] Specifically, during the welding of each set of peripheral welds, after welding the first weld within that set of peripheral welds, welds that are centrally symmetrical to that weld are then welded. Next, the other two welds that are centrally symmetrical are welded.

[0110] See Figure 4 Taking the first set of peripheral welds as an example, we will first weld the first weld 1, then weld any one of the following: the second weld 2, the third weld 3, the fourth weld 4, and the fifth weld 5. If we choose to weld the fourth weld 4 first, then weld the fifth weld 5, which is centrally symmetrical to the fourth weld 4. After that, weld the second weld 2 and the third weld 3 in sequence, or we can weld the third weld 3 first and then weld the second weld 2.

[0111] The welding sequence of the peripheral welds in other groups is similar to that of the peripheral welds in the first group, and will not be repeated here.

[0112] This embodiment effectively prevents welding deformation by adopting a specific welding sequence of first welding the center seam and then the peripheral seams, and by welding two seams in a centrally symmetrical position within each group of peripheral seams. This facilitates subsequent assembly and ensures the accuracy of the entire grid wing dimensions.

[0113] Step 6: Annealing heat treatment

[0114] Due to the large number of welds and the large heat input, the mutual constraint between the numerous grids after laser welding is significant, resulting in a large torque between the grid plates, which affects the subsequent welding of the grid plates to the baffles.

[0115] Therefore, in a preferred embodiment, the fully welded grid plate is annealed together with the assembly fixture to eliminate welding stress. At the same time, due to the constraint effect of the limiting block and slot of the assembly fixture, the dimensional accuracy of the grid plate is well controlled after annealing.

[0116] Step 7: Weld the grid plate and baffle plate

[0117] As shown in Figure 5, there are two types of welded joints between the grid plate and the baffle: intersecting welded joints (Figure 5(a)) and single-sided welded joints (Figure 5(b)). Welding is performed according to the laser welding direction Z shown in Figure 5.

[0118] As shown in Figure 5, to facilitate welding and prevent stress concentration, a boss needs to be pre-machined on the baffle and at the intersection of the grid plate and the baffle. This allows for a smooth connection between the grid plate and the baffle, avoiding interference between the end face of the grid plate and the baffle, and facilitating assembly and welding. Figure 6 As shown, the welded joints of the grid plate and the baffle are designed as equal-sized butt joints. The width × height of the boss is 2a × a, and the thickness of the grid plate is... ).

[0119] Step 8: Inspect the weld quality

[0120] Due to the limitations of this type of deep cavity grid structure, commonly used methods such as X-ray and ultrasound cannot effectively detect weld quality. In-furnace testing can be used to determine weld quality. For the physical product after welding, phased array ultrasonic testing technology can be selected to inspect the weld quality.

[0121] This invention proposes a control and process method for significantly reducing laser welding deformation of deep cavity cross-grid fins. By rationally setting the structure of the grid plate, setting up special assembly tooling for assistance, controlling assembly accuracy, adjusting the welding sequence, and performing subsequent heat treatment, welding deformation can be effectively controlled, ensuring the theoretical surface accuracy of the fin after welding.

[0122] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A forming process for a grid structure for a wing rudder, characterized in that, Includes the following steps: Step a: Use assembly fixtures to test assemble the grid plate and the baffle. The test assembly is carried out in the order of assembly from the middle to both sides to ensure that no residual stress is generated after assembly. Step b: Pickling to remove surface oil and oxide scale; Step c: Position welding, positioning the cross grid of the interlocking seam of the middle grid plate, and the contact area between the grid plate and the vertical plate; Step d: Use laser welding to fix the grid plate on the welding fixture. The laser welding joint deflection angle is 45°. Start the arc welding at a position lower than half of the grid plate until the entire weld is welded. During welding, follow the specific order of welding the center weld first and then the peripheral welds to obtain the grid structure for the wing rudder. The wing rudder grid structure includes grid plates and baffles, and the baffles are arranged in sequence to form a closed loop; The grid plate is inserted into the internal space formed by the baffle to form a hollow area. The end of the grid plate is fixedly connected to the baffle. The grid plate is provided with an opening groove that runs through the thickness direction of the grid plate. The depth of the opening slot is equal to half the width of the grid plate; The number of opening slots is multiple, and the multiple opening slots are distributed along the length direction of the grid plate; The grid plate is made of aluminum alloy or titanium alloy; In step a, the method further includes... a1. Insert the grid plate with the opening facing upward into the slot of the assembly fixture; when inserting, make the bottom of the grid plate opening slot flush with the upper surface of the hollow unit; a2. Take another grid plate, place it with the opening facing down, and mate it with the grid plate from step a1. After the two grid plates are inserted, they should be flush and without protrusion. When assembling, start assembling the grid plates from the middle to both sides to ensure that no residual stress is generated after assembly. a3. Grind and repair the grating plate that contacts the baffle, so that the gap between the beveled grating plate and the vertical plate does not exceed 0.1mm, and locally does not exceed 0.2mm. Then grind and repair the other right-angled edge to make it fit well with the baffle. The assembly fixture includes a frame with a hollow area. The hollow area includes multiple hollow units. The cross-section of each hollow unit is shaped like a cross. The four protruding parts of the cross shape are respectively separated from the protruding parts of the adjacent hollow units. The multiple gaps are connected along the length of the grid plate to form a slot for placing the grid plate.

2. The forming process for the radiator grid structure according to claim 1, characterized in that, The width of the opening slot is greater than the thickness of the grid plate.

3. The forming process for the radiator grid structure according to claim 2, characterized in that, The ends of the grid plate include flat ends and beveled ends; The term "flat end" refers to the end face of the grid plate being perpendicular to the main body of the grid plate, while the term "beveled end" refers to the end face of the grid plate being at a certain angle to the main body of the grid plate.

4. The forming process for the radiator grid structure according to claim 3, characterized in that, One end of the grid plate is a flat end, and the other end is a beveled end.

5. The forming process for the radiator grid structure according to claim 3, characterized in that, Both ends of the grid plate are beveled ends.

6. The forming process for the radiator grid structure according to claim 1, characterized in that, The length of the grid plate is 800-1000mm.

7. The forming process for the radiator grid structure according to claim 6, characterized in that, The width of the grid plate is 90-100mm.

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