Processing method of titanium alloy thin-wall plate

Abstract

The invention discloses a method for processing a titanium alloy thin-wall plate, which is characterized in that a plurality of products are arranged on the same blank in a typesetting manner, so that the clamping times and the blank replacement frequency of single processing are reduced, the idle time of equipment is shortened, and meanwhile, the cutter loss cost can be effectively shared and the problem of high cutter cost can be relieved by synchronously processing a plurality of products. The design of the boss serves as a thickness reference, and the arrangement of the diagonal positioning hole provides a stable positioning reference for subsequent machining, so that positioning deviation caused by difficult clamping of the composite surface structure can be avoided no matter whether an outer molded surface is subjected to turning rough machining or the boss, a cylindrical table and the positioning hole serve as references during subsequent finish machining, and the machining precision is improved. Workpiece vibration caused by unstable clamping is reduced, then tool abrasion is reduced, meanwhile, the influence of cutting force and clamping force on the thin-wall grid structure can be effectively controlled through stable positioning, machining deformation is reduced, and the machining requirements of the application field for high performance and high precision of the titanium alloy wall plate are met.

Description

Technical Field

[0001] This application relates to the field of titanium alloy parts forming technology, and in particular to a method for processing thin-walled titanium alloy plates. Background Technology

[0002] In the aerospace field, aircraft structural components place extremely high demands on the comprehensive performance of materials. They must not only possess excellent strength, fatigue resistance, and corrosion resistance, but also meet lightweight design requirements to reduce flight energy consumption. Titanium alloys, with their core advantages of high strength, low density, excellent high and low temperature performance, strong fatigue resistance, and corrosion resistance, have become one of the preferred materials for key structural components in the aerospace field. Titanium alloy panels, in particular, are widely used in core parts such as aircraft fuselages and wings, and their structural integrity and processing precision directly determine the flight safety, reliability, and overall performance of the aircraft.

[0003] As the aerospace industry continues to develop towards high performance and lightweight designs, the demand for titanium alloy panels continues to grow. However, in actual processing, due to the characteristics of titanium alloy materials and the structural features of the panels themselves, existing processing technologies still face many insurmountable shortcomings. Titanium alloy panels are mostly thin-walled mesh structures with poor rigidity. During processing, they are easily deformed by cutting forces, clamping forces, and cutting heat, resulting in bending and twisting. This deformation not only causes the dimensional and shape accuracy of the panels to fail to meet design requirements but may also lead to subsequent assembly difficulties and even product scrap, seriously affecting processing quality and product qualification rate. Furthermore, the special composite surface structure makes clamping and positioning difficult. Existing titanium alloy panel processing technologies have significant shortcomings in cost control, processing quality, and production efficiency, making it difficult to meet the processing requirements of the aerospace field for high-performance, high-precision titanium alloy structural components. Summary of the Invention

[0004] In view of the deficiencies in the prior art, this application provides a forming method for titanium alloy hinge structures to solve the problems of high difficulty, low precision and low efficiency in forming thin-walled titanium alloy plates in the prior art.

[0005] The above-mentioned objectives of this application are mainly achieved through the following technical solutions: A method for processing a thin-walled titanium alloy plate, the method comprising: Multiple products are arranged on the same blank. Bosses are designed on the upper and lower sides of the products as thickness references, and positioning holes are designed on the bosses at diagonal positions. The blank is rough machined to remove most of the excess material in the outer shape, and a boss is machined on the boss. Connecting holes and positioning holes are then machined on the boss. The inner cavity of the product is rough-machined, and rivet holes are machined at the mesh connection points; Turn the blank over and use the boss and positioning holes as positioning references to rough machine the outer surface of the product. Machining cylindrical truncated cones corresponding to the rivet holes at the rivet hole positions on the outer surface, and machining cylindrical truncated cones at the recessed areas; Turn the blank over again, and use the boss as the positioning reference to fix and connect the various bosses of the product by gluing. After precision machining of the boss, cylindrical platform, and positioning holes, these serve as positioning references. The product's shape and the upper surface of the boss are then precision machined. The inner cavity of the product is precision machined, as are the recessed surface and the upper surface of the product. The blank is flipped over again, and the outer surface of the product is processed using the boss and positioning hole as positioning references until the requirements are met. Then the cylindrical platform is removed to form the initial product. Remove the boss, separate the product, and obtain the finished product.

[0006] In an optional implementation, before layout, the blank size is determined by reserving the size of the boss and the allowance for the product's shape.

[0007] In an optional implementation, when arranging products, multiple products are arranged in a cross shape on the same blank.

[0008] In an optional implementation, when bosses are designed on the top and bottom sides of the product, the bosses between adjacent products also serve as the reference for adjacent products.

[0009] In an optional implementation, when machining the connecting holes and positioning holes on the boss, a machining allowance is reserved.

[0010] In an optional implementation, after machining the rivet holes at the mesh connection, the surface of the boss is machined using a milling process until the flatness of the boss surface reaches 0.02mm.

[0011] In an optional embodiment, when machining the cylindrical platform, the cylindrical platform at the rivet hole position and the cylindrical platform at the recessed position are at the same height.

[0012] In an optional embodiment, after bonding each boss, the upper surface of the boss and the cylindrical platform is finished until the flatness of the finished area is 0.02mm.

[0013] In an optional implementation, when finishing the inner cavity of the product, the internal contour dimensions and surface roughness of the product are completed until they meet the requirements. The recessed surface is finished until the shape and positional accuracy of the recessed surface meet the requirements. The upper surface of the product is finished until the perpendicularity between the upper surface and the bottom surface meets the requirements.

[0014] In an optional implementation, when removing the boss, the boss is removed by wire cutting equipment to separate multiple products, and the flatness error between the cut surface and the previous upper surface is kept within 0.1mm.

[0015] Compared with the prior art, the advantages of this application are: The processing method described in this application is used for processing thin-walled titanium alloy plates. The processing method includes: arranging multiple products on the same blank; designing bosses on the upper and lower sides of the products as thickness references; and designing positioning holes on the bosses at diagonal positions; rough machining the blank to remove most of the excess material in the external direction, machining the bosses, and machining connecting holes and positioning holes on the bosses; rough machining the inner cavity of the product, and simultaneously machining riveting holes at the mesh connection points; flipping the blank over, using the bosses and positioning holes as positioning references, and rough machining the outer surface of the product; and rough machining the outer surface... Machining cylindrical pedestals corresponding to the rivet holes, and machining cylindrical pedestals at the recessed areas; flipping the blank over again, using the bosses as positioning references, and fixing the various bosses of the product together using adhesive bonding; after finishing the bosses, cylindrical pedestals, and positioning holes as positioning references, finishing the product's shape and the upper surface of the bosses; finishing the product's internal cavity, as well as the recessed surface and the product's upper surface; flipping the blank over again, using the bosses and positioning holes as positioning references, machining the product's outer surface until the requirements are met, then removing the cylindrical pedestals to form a preliminary product; removing the bosses, separating the product, and obtaining the finished product.

[0016] This processing method reduces the number of clamping operations and blank change frequency in a single processing cycle by arranging multiple products on the same blank, thus reducing equipment downtime. At the same time, simultaneous processing of multiple parts can effectively distribute tool wear costs and alleviate the problem of high tool expenses. The design of the boss not only serves as a thickness reference, but its diagonal positioning holes also provide a stable positioning reference for subsequent processing. Whether it is roughing the outer surface by flipping or finishing it, the boss, cylindrical platform, and positioning holes can be used as references to avoid positioning offset caused by the difficulty of clamping the composite surface structure, reduce workpiece vibration caused by unstable clamping, and thus reduce tool wear. At the same time, stable positioning can effectively control the influence of cutting force and clamping force on the thin-walled mesh structure and reduce processing deformation.

[0017] The roughing stage first removes most of the excess material from the outer surface and machines bosses, connecting holes, positioning holes, and riveting holes for the internal cavities. Then, roughing of the outer surfaces and machining of the cylindrical platforms are performed progressively, finally leading to the finishing stage. This layered machining path planning gradually reduces the blank allowance, lowers the material removal amount per cut, and avoids problems such as excessive cutting temperature and low machining efficiency caused by large blank removal amounts. Simultaneously, the machining of the cylindrical platforms at recessed areas and riveting hole positions further assists in positioning during finishing, improving machining accuracy. The step of gluing and fixing the bosses enhances the overall rigidity of the product during the finishing stage, reduces deformation of thin-walled structures during finishing, and ensures dimensional and shape accuracy.

[0018] This method enables simultaneous processing of multiple products, improving processing efficiency and reducing tooling and equipment costs per unit. A stable positioning datum system solves the problems of difficult clamping of composite surfaces and deformation of thin-walled structures, improving product yield. Layered machining path planning effectively controls cutting temperature and material removal, further enhancing processing efficiency and accuracy. This processing method can significantly shorten the mass production cycle of titanium alloy thin-walled plates, reduce manufacturing costs, and simultaneously ensure dimensional accuracy, shape accuracy, and surface quality, meeting the high-performance, high-precision processing requirements of various application fields for titanium alloy plates. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic flowchart illustrating the molding method provided in an embodiment of this application; Figure 2 This is a schematic diagram of product layout provided for an embodiment of this application; In the diagram: 100, product; 200, boss; 300, positioning hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are merely for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0022] Figure 1 A schematic flowchart illustrating the molding method provided in an embodiment of this application; Figure 2 This is a schematic diagram of the layout of product 100 provided in an embodiment of this application.

[0023] like Figure 1 , Figure 2 As shown, a method for processing a thin-walled titanium alloy plate includes: like Figure 2 As shown, multiple products 100 are arranged on the same blank. Bosses 200 are designed on the upper and lower sides of the products 100 as thickness references, and positioning holes 300 are designed on the bosses 200 at diagonal positions. The blank is rough machined to remove most of the excess material in the outer shape direction, and the boss 200 is machined. Connecting holes and positioning holes 300 are machined on the boss 200. The inner cavity of product 100 is rough-machined, and rivet holes are machined at the mesh connection points. The blank is flipped over, and the outer surface of the product 100 is rough machined using the boss 200 and the positioning hole 300 as positioning references. Machining cylindrical truncated cones corresponding to the rivet holes at the rivet hole positions on the outer surface, and machining cylindrical truncated cones at the recessed areas; Turn the blank over again, and use the boss 200 as the positioning reference to fix and connect the various bosses 200 of the product 100 by adhesive bonding. After precision machining of the boss 200, the cylindrical platform, and the positioning hole 300, the outer shape of the product 100 and the upper surface of the boss 200 are used as positioning references. The inner cavity of product 100 is precision machined, as are the recessed surface and the upper surface of product 100. The blank is flipped over again, and the outer surface of product 100 is processed with the boss 200 and the positioning hole 300 as the positioning reference until the requirements are met. Then the cylindrical platform is removed to form the initial product. Remove boss 200, separate product 100, and obtain the finished product.

[0024] When performing pre-treatment and baseline design of the blank, select titanium alloy forgings or castings that meet aerospace standards as the blank. Based on the size of product 100 and the table travel of the machining equipment, the machining equipment can be a five-axis machining center. Multiple products 100 are arranged in a matrix or staggered layout on the same blank. The layout spacing is controlled at 5-15mm and can be adjusted according to the wall thickness of product 100. When the wall thickness is small, a smaller spacing is used to reduce blank waste, and when the wall thickness is large, a larger spacing is used to avoid machining interference. Meanwhile, a boss 200 structure is integrally designed on the upper and lower edges of each product 100. The thickness of the boss 200 is greater than the finished wall thickness of the product 100, serving as the thickness benchmark for subsequent processing. Sufficient machining allowance is reserved to ensure dimensional accuracy. The length and width of the boss 200 are 20-50mm to ensure that the boss 200 has sufficient rigidity to withstand clamping and cutting forces.

[0025] On two diagonally opposite bosses 200 on the upper and lower sides of each product 100, positioning holes 300 are machined respectively. The diameter of the positioning holes 300 is [missing information], and the axis of the positioning holes 300 is perpendicular to the design reference plane of the product 100. The coaxiality error of the positioning holes 300 is ensured to be no more than 0.02mm by CNC drilling machine machining, so as to provide a precise positioning reference for subsequent processing.

[0026] Secondly, the layout blank is clamped on the worktable of the machining center using a vise or vacuum chuck. The blank is rough machined using a carbide end mill. The diameter of the cutter is selected according to the blank allowance. 70%-90% of the excess material in the outer direction is removed to avoid deformation due to excessive allowance during subsequent finishing. At the same time, the preset boss 200 structure is machined. After rough machining, replace the drill bit with one that matches the diameter of the positioning hole 300 and machine the preset positioning hole 300 on the diagonal boss 200. At the same time, machine the connecting hole on the other bosses 200 for auxiliary positioning during subsequent gluing and fixing. During the machining process, the cutting temperature is controlled by continuous cooling with coolant to reduce tool wear and material thermal deformation.

[0027] Next, keeping the blank clamping state unchanged, rough machining is performed on the inner cavity of product 100. The excess material in the inner cavity is gradually removed by layer milling, leaving a finishing allowance. While rough machining the inner cavity, the multi-axis linkage function of the machining center is used to simultaneously machine the riveting holes at the connection of the grid structure.

[0028] Subsequently, the blank is removed from the worktable and flipped over. When re-clamping, the lower surface of the boss 200 is used as the support surface and the positioning hole 300 on the diagonal boss 200 is used as the positioning reference. Precise positioning is achieved by the cooperation of the positioning pin and the positioning hole 300. After clamping, the outer surface of the product 100 is rough-machined using a face milling cutter. The same layer milling method is used, with a finishing allowance reserved. The cutting force is monitored in real time during the machining process. When the cutting force exceeds the preset threshold, the cutting parameters are automatically adjusted to avoid deformation of the thin-walled structure due to excessive cutting force.

[0029] Next, after the rough machining of the outer surface is completed, while keeping the blank in the clamped state, change the end mill to machine the cylindrical platform at the position corresponding to the riveting hole on the outer surface; at the same time, machine the cylindrical platform at the edge of the recessed area. After the cylindrical platform is machined, turn the blank over again and re-clamp it. When re-clamping, use the upper surface of the boss 200 as the support surface and the diagonal positioning hole 300 as the reference. Apply glue between the bosses 200 of adjacent products 100, apply pressure through the tooling fixture, and keep it stationary under pressure so that the bosses 200 of each product 100 form an integral connection structure, thereby improving the overall rigidity.

[0030] Then, after the structural adhesive has fully cured, a diamond end mill can be used to finish the upper and lower surfaces of the boss 200, the outer circular surface of the cylindrical platform, and the inner surface of the positioning hole 300. The finished boss 200, cylindrical platform, and positioning hole 300 are used as the final positioning reference. Using this reference, the outline of the product 100 is finished using a five-axis linkage machining method. At the same time, the upper surface of the boss 200 is finished to make the surface of the boss 200 flush with the design reference surface of the product 100. After the outer shape is finished, a ball end mill is used to finish the inner cavity of the product 100. While finishing the inner cavity, the recessed surface and the upper surface of the product 100 are finished simultaneously.

[0031] Finally, the blank is flipped over again and re-clamped with the finished boss 200 and positioning hole 300 as the reference. The outer surface of product 100 is finally machined with a face milling cutter to remove the remaining finishing allowance and ensure that the flatness error and dimensional tolerance of the outer surface meet the design requirements. After the outer surface is machined, an end mill is used to cut along the root of the cylindrical platform to remove all the cylindrical platforms, forming the initial product 100. After the initial product is completed, all bosses 200 are removed, and multiple products 100 are separated from the blank. After separation, the edges of products 100 are deburred using a grinding wheel or polishing wheel to finally obtain the finished titanium alloy thin-walled plate that meets the design requirements.

[0032] like Figure 1 , Figure 2As shown, in an optional embodiment, the processing method of this application is used for processing titanium alloy thin-walled plates. The processing method includes: arranging multiple products 100 on the same blank, designing bosses 200 on the upper and lower sides of each product 100 as thickness references, and designing positioning holes 300 on the bosses 200 at diagonal positions; rough machining the blank to remove most of the excess material in the external direction, machining the bosses 200, and machining connecting holes and positioning holes 300 on the bosses 200; rough machining the inner cavity of the product 100, and simultaneously machining riveting holes at the mesh connection points; flipping the blank over, using the bosses 200 and positioning holes 300 as positioning references, and rough machining the outer surface of the product 100; and rough machining the outer surface of the product 100. Cylinder pedestals are machined at the riveting hole positions on the surface, corresponding to the riveting holes. Cylinder pedestals are also machined at the recessed areas. The blank is flipped over again, and using the boss 200 as a positioning reference, the various bosses 200 of product 100 are fixedly connected using adhesive bonding. After finishing the bosses 200, cylinder pedestals, and positioning holes 300, the outer shape of product 100 and the upper surface of the bosses 200 are finished using these as positioning references. The inner cavity of product 100 is finished, along with the recessed surface and the upper surface of product 100. The blank is flipped over again, and using the bosses 200 and positioning holes 300 as positioning references, the outer surface of product 100 is machined until the requirements are met. The cylinder pedestals are then removed, forming a preliminary product. The bosses 200 are removed, and product 100 is separated to obtain the finished product.

[0033] This processing method reduces the number of clamping operations and blank change frequency by arranging multiple products 100 on the same blank, thus reducing equipment downtime. At the same time, simultaneous processing of multiple products can effectively distribute tool wear costs and alleviate the problem of high tool expenses. The design of the boss 200 not only serves as a thickness reference, but its diagonal positioning hole 300 provides a stable positioning reference for subsequent processing. Whether it is roughing the outer surface by flipping or subsequent finishing, using the boss 200, cylindrical platform and positioning hole 300 as the reference can avoid positioning offset caused by the difficulty of clamping the composite surface structure, reduce workpiece vibration caused by unstable clamping, and thus reduce tool wear. At the same time, stable positioning can effectively control the influence of cutting force and clamping force on the thin-walled mesh structure and reduce processing deformation.

[0034] The roughing stage first removes most of the excess material from the outer surface and processes the bosses 200, connecting holes, positioning holes 300, and riveting holes in the internal cavity. Then, the outer surface roughing and cylindrical platform machining are carried out step by step, finally entering the finishing stage. This layered machining motion path planning can gradually reduce the blank allowance, reduce the amount of material removed in a single cut, and avoid the problems of excessive cutting temperature and low machining efficiency caused by a large amount of blank removal. At the same time, the machining of the cylindrical platform at the recessed area and the riveting hole position can further assist in positioning during the finishing process and improve machining accuracy. The step of gluing and fixing the bosses 200 can enhance the overall rigidity of the product 100 during the finishing stage, reduce the deformation of the thin-walled structure during finishing, and ensure dimensional and shape accuracy.

[0035] This method enables simultaneous machining of multiple products (100 units), improving processing efficiency and reducing tooling and equipment costs per product (100 units). A stable positioning datum system solves the problems of difficult clamping of composite surfaces and deformation of thin-walled structures, improving the product yield (100 units). Layered machining path planning effectively controls cutting temperature and material removal, further enhancing processing efficiency and accuracy. This machining method can significantly shorten the mass production cycle of titanium alloy thin-walled plates, reduce manufacturing costs, and simultaneously ensure the dimensional accuracy, shape accuracy, and surface quality of the products (100 units), meeting the high-performance, high-precision machining requirements of various application fields for titanium alloy plates.

[0036] In an optional implementation, before typesetting the product 100, the blank size is determined by reserving the size of the boss 200 and the external allowance of the product 100.

[0037] Before laying out product 100, when determining the blank size by reserving the dimensions of the boss 200 and the external allowance of product 100, it is necessary to perform a two-way calculation considering the cutting characteristics of titanium alloy material and the stroke limitations of the machining equipment. Based on the design dimensions of the boss 200, roughing and finishing allowances should be reserved during the processing of the boss 200 to avoid the failure of the boss 200 reference due to insufficient allowances in subsequent processing. Secondly, for the shape of product 100, the material removal rate of 70%-90% in the roughing stage should be considered, and roughing and finishing allowances should be reserved for the shape. At the same time, the gap allowance between adjacent products 100 should be calculated based on the layout spacing of multiple products 100. Finally, the length and width of the blank should be set based on the sum of the above allowances. The height of the blank should cover the finished height of product 100, the height of the boss 200, and the machining allowances of the upper and lower surfaces to ensure that the blank size can meet the needs of simultaneous processing of multiple products 100, avoid material waste, and reduce the adjustment costs of subsequent processes.

[0038] In an optional implementation, when arranging the products 100, multiple products 100 are arranged in a cross shape on the same blank.

[0039] When arranging product 100, multiple products 100 are arranged in a "+" shape on the same blank. This is suitable for scenarios where the product 100 is small in size and the batch demand is large, optimizing the blank utilization rate and processing efficiency. The "+" shape arrangement takes the center of the blank as the origin and arranges products 100 in the horizontal and vertical directions respectively. The number of products 100 in the horizontal and vertical directions can be flexibly adjusted according to the blank size and product 100 size. When arranging, a spacing of 200 is reserved between the bosses of adjacent products 100, and the positioning holes 300 of all products 100 must be in the same reference coordinate system. In addition, the "+" shape arrangement can make the processing path more continuous. For example, in the roughing stage, the tool can process a row of products 100 in the horizontal direction and then directly turn to the vertical direction to process, reducing the tool idle stroke, and at the same time facilitating the reference alignment when flipping and clamping.

[0040] In an optional implementation, when the upper and lower sides of the product 100 are respectively designed with bosses 200, the bosses 200 between adjacent products 100 simultaneously serve as the reference for adjacent products 100.

[0041] When the upper and lower sides of product 100 are designed with bosses 200, the bosses 200 between adjacent products 100 are used as the reference for adjacent products 100. This can further improve positioning accuracy and processing efficiency. In the layout design stage, the edge bosses 200 of adjacent products 100 are made to overlap, ensuring that the reference requirements of two products 100 can be covered at the same time, reducing the number of bosses 200 and reducing the consumption of raw material. At the same time, by sharing the reference of the bosses 200, the positioning error of adjacent products 100 is kept consistent, avoiding assembly misalignment caused by the deviation of their respective references.

[0042] In an optional implementation, machining allowances are reserved when machining connecting holes and positioning holes 300 on the boss 200. For the positioning holes 300, roughing and finishing allowances are reserved, which are used for reaming or grinding in the subsequent datum finishing stage. For the connecting holes, roughing and semi-finishing allowances are reserved. These allowances can be fine-tuned before gluing to ensure alignment between the connecting holes and the holes on the adjacent product 100 boss 200, avoiding uneven assembly pressure due to hole misalignment during gluing. Furthermore, the machining allowances for all holes must be evenly distributed along the hole's axial direction. This reserved allowance effectively prevents dimensional deviations during hole machining and improves datum stability.

[0043] In an optional embodiment, after machining the rivet holes at the mesh connection, the surface of the boss 200 is machined using a milling process until the flatness of the surface of the boss 200 reaches 0.02mm.

[0044] After machining the rivet holes at the mesh connection, the surface of the boss 200 is machined using a milling process until the flatness reaches 0.02mm. First, a carbide face milling cutter can be used for rough milling to remove rough machining residue and oxide layer from the surface of the boss 200. Then, a diamond face milling cutter can be used for finish milling. During the machining process, a dial indicator or laser interferometer should be used to monitor the flatness of the boss 200 surface in real time. An inspection should be performed after machining each boss 200. If the flatness exceeds the tolerance, the milling parameters should be adjusted and the machining repeated. This process corrects the flatness error of the boss 200 surface in advance, providing a flat support surface for subsequent adhesive bonding and datum positioning, and avoiding uneven clamping force caused by unevenness of the boss 200 surface.

[0045] In an optional embodiment, when machining the cylindrical platform, the cylindrical platform at the rivet hole position and the cylindrical platform at the recessed position are at the same height.

[0046] First, measure the depth of the sunken area to ensure that the height of the cylindrical platform at the sunken location is equal to the depth of the sunken area. Second, measure the surface height of the rough-machined outer surface at the rivet hole location and calculate the height of the cylindrical platform at the rivet hole location. A cylindrical platform of uniform height can serve as an auxiliary reference in the subsequent finishing stage, allowing the tool to machine along the same height plane, reducing the number of tool height adjustments, and avoiding positioning deviations caused by differences in cylindrical platform height, thereby improving the overall machining accuracy of the product.

[0047] In an optional embodiment, after bonding each boss 200, the upper surface of the boss 200 and the cylindrical platform is finished until the flatness of the finished area is 0.02mm.

[0048] First, check the flatness of the bonding surface. Then, using the face milling function of a five-axis machining center, establish a coordinate system with the rough-machined boss 200 positioning hole 300 as the reference. First, perform finish machining on the upper surface of the boss 200. After the boss 200 is machined, use the upper surface of the finished boss 200 as the reference, adjust the tool height, and perform finish machining on the upper surface of the cylindrical platform to make the boss 200 and the cylindrical platform form a unified planar reference. This provides a stable positioning reference for the subsequent finish machining of the outer shape and inner cavity of product 100, and ensures the dimensional correlation accuracy of each machined surface.

[0049] In an optional embodiment, when finishing the inner cavity of product 100, the internal contour dimensions and surface roughness of product 100 are completed until they meet the requirements. The recessed surface is finished until the shape and positional accuracy of the recessed surface meet the requirements. The upper surface of product 100 is finished until the perpendicularity between the upper surface and the bottom surface meets the requirements.

[0050] For the internal contour dimensions, a coordinate measuring machine is used to collect contour data in real time, and the tool path is adjusted through the closed-loop control system of the machining center to control the dimensional tolerance. Secondly, the surface roughness is achieved by selecting appropriate tools and machining parameters. For the recessed surface, five-axis linkage machining is required to ensure shape and position accuracy. In terms of shape accuracy, an optical profilometer can be used to detect the curvature of the recessed surface. In terms of position accuracy, the positioning hole 300 can be used as a reference to ensure that the center coordinate deviation of the recessed surface and the distance deviation from the edge of product 100 meet the requirements. When finishing the upper surface of product 100, a face milling cutter is used to machine to the designed thickness, and then the perpendicularity between the upper surface and the bottom surface is measured by a perpendicularity detection fixture to ensure the assembly fit of product 100.

[0051] In an optional implementation, when removing the boss 200, the boss 200 is removed by wire cutting equipment to separate multiple products 100, and the flatness error between the cut surface and the previous and upper surfaces is kept within 0.1mm.

[0052] The wire EDM equipment can be a slow wire EDM. Before cutting, the upper surface of the product 100 is used as a reference to adjust the cutting path of the wire EDM machine to keep the cutting surface perpendicular to the upper surface. During the cutting process, a laser micrometer is used to monitor the flatness of the cutting surface in real time to ensure that the flatness error between the cutting surface and the upper surface is within the required range. In addition, the cutting sequence should be maintained so as to cut the connecting parts of the internal bosses 200 of the product 100 first, and then cut the edge bosses 200 to avoid deformation of the product 100 caused by the cutting force. After separation, the product 100 needs to undergo micro-polishing treatment of the cutting surface to remove the burrs and micro-cracks remaining from the cutting process, and ensure that the edge quality of the product 100 meets aerospace standards.

[0053] It should be understood that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of the invention.

[0054] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0055] It should be understood that in the description of this invention, the terms "upper," "vertical," "inner," "outer," etc., indicate the orientation or positional relationship as commonly placed when the disclosed product is used, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or combinations thereof.

[0058] Specific details are provided in the following description to provide a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may be omitted in the depiction of non-essential details to avoid obscuring the exemplary embodiments.

[0059] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0060] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A method for processing thin-walled titanium alloy plates, characterized in that, The processing method includes: Multiple products are arranged on the same blank. Bosses are designed on the upper and lower sides of the products as thickness references, and positioning holes are designed on the bosses at diagonal positions. The blank is rough machined to remove most of the excess material in the outer shape, and a boss is machined on the boss. Connecting holes and positioning holes are then machined on the boss. The inner cavity of the product is rough-machined, and rivet holes are machined at the mesh connection points; Turn the blank over and use the boss and positioning holes as positioning references to rough machine the outer surface of the product. Machining cylindrical truncated cones corresponding to the rivet holes at the rivet hole positions on the outer surface, and machining cylindrical truncated cones at the recessed areas; Turn the blank over again, and use the boss as the positioning reference to fix and connect the various bosses of the product by gluing. After precision machining of the boss, cylindrical platform, and positioning holes, these serve as positioning references. The product's shape and the upper surface of the boss are then precision machined. The inner cavity of the product is precision machined, as are the recessed surface and the upper surface of the product. The blank is flipped over again, and the outer surface of the product is processed using the boss and positioning hole as positioning references until the requirements are met. Then the cylindrical platform is removed to form the initial product. Remove the boss, separate the product, and obtain the finished product.

2. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: Before laying out the product, the blank size is determined by reserving the size of the boss and the allowance for the product's shape.

3. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: When arranging products, multiple products are arranged in a cross shape on the same blank.

4. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: When bosses are designed on the top and bottom sides of a product, the bosses between adjacent products also serve as the reference for adjacent products.

5. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: When machining connecting holes and positioning holes on the boss, allowance should be reserved for machining.

6. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: After machining the rivet holes at the mesh connection, the surface of the boss is machined using a milling process until the flatness of the boss surface reaches 0.02mm.

7. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: When machining a cylindrical platform, the cylindrical platform at the rivet hole position and the cylindrical platform at the recessed position are at the same height.

8. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: After gluing the various bosses together, finish machine the upper surface of the bosses and cylindrical platforms until the flatness of the finished area is 0.02mm.

9. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: When finishing the internal cavity of the product, the internal contour dimensions and surface roughness of the product are completed until they meet the requirements. The recessed surface is finished until the shape and positional accuracy of the recessed surface meet the requirements. The upper surface of the product is finished until the perpendicularity between the upper surface and the bottom surface meets the requirements.

10. The processing method of the titanium alloy thin-walled plate as described in claim 1, characterized in that: When removing bosses, wire cutting equipment is used to remove them, thereby separating multiple products and keeping the flatness error between the cut surface and the previous and upper surfaces within 0.1mm.

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