A crown block gantry combined machining machine tool and machining method

Abstract

The application discloses a kind of overhead travelling crane gantry compound processing machine tool and processing method, wherein machine tool includes machine tool bed, beam, processing main shaft module, rotary table, compound processing module and the horizontal clamping worktable for the horizontal clamping of workpiece to be processed, the horizontal clamping worktable can when the machining process that workpiece to be processed is not needed workpiece to be processed rotation is carried out to workpiece to be processed, clamping fixed and support workpiece to be processed are located in machining area, when the machining process that workpiece to be processed needs workpiece to be processed rotation or overturn, away from rotation machining area or overturn area.The overhead travelling crane gantry compound processing machine tool disclosed by the application can complete the machining of complex workpieces such as landing gear at one time, avoiding the need for transfer between different machine tools in the prior art, thereby causing the cumulative error to increase due to multiple clamping, long process transfer cycle, multiple clamping affecting machining consistency, and the problems of high investment cost of special equipment, large floor area, etc.

Description

Technical Field

[0001] This invention relates to the field of aerospace workpiece processing technology, and in particular to a crane-gantry composite machining center and processing method. Background Technology

[0002] The landing gear, along with the airframe, engine, and avionics system, constitutes the four major systems of a modern aircraft. Often referred to as the "foothold of life" or "legs of the aircraft," it bears crucial load-bearing responsibilities during takeoff, landing, taxiing, and parking. The landing gear is divided into main landing gear and nose landing gear, accounting for approximately 3.5%–5.0% of the aircraft's total weight and about 10%–15% of its structural weight. It involves thousands of parts and requires stringent standards of precision and consistency. In my country's large aircraft sector, the localization of landing gear has undergone a challenging journey from scratch: In 2012, AVIC Aircraft Landing Gear Co., Ltd. and Liebherr of Germany jointly established Liebherr AVIC Landing Gear (Changsha) Co., Ltd. to produce landing gear systems for the C919 project; In January 2019, key forgings such as the outer cylinder of the C919 main landing gear passed the installation review, marking the complete localization of key forgings; Starting with the fourth C919 prototype (104th aircraft), the landing gear adopted domestically assembled and delivered products; On February 26, 2025, the C919 main landing gear piston rod production line was officially opened and the first piece was delivered, marking a crucial step in the localization of landing gear manufacturing from tackling key problems to mass production.

[0003] The difficulty of landing gear manufacturing can be summarized in three aspects. First, the level of system complexity: the landing gear is one of the most structurally complex components in an aircraft's avionics system. The entire system consists of tens of thousands of parts, with the main landing gear alone having more than 4,000 parts. Among these, the outer cylinder and piston rod are the most difficult to manufacture. It is the only load-bearing channel supporting tens or even hundreds of tons of load during takeoff and landing. The load path is concentrated, and the tolerance for errors in fatigue strength, fracture toughness, corrosion resistance, and dimensional consistency is extremely low. Second, regarding the ultimate performance of materials: key load-bearing components often use difficult-to-machine materials such as 300M ultra-high strength steel and titanium alloys. These materials must simultaneously meet contradictory performance indicators such as ultra-high strength (tensile strength approximately 1900–2100 MPa), high toughness (elongation >10%), and ultra-high fatigue strength (>1000 MPa). This makes the materials difficult to smelt, forge, and machine, and extremely sensitive to surface condition and stress concentration—even tiny tool marks, grinding burns, or burrs can cause a sharp drop in fatigue strength. Therefore, the manufacturing chain must embed "fatigue-resistant manufacturing / surface integrity control" into every process. Third, regarding the precision manufacturing of large components: large load-bearing forgings such as the main lifting cylinder have large outlines, drastic cross-sectional changes, and uneven wall thickness distribution, making dimensional and streamline control during forging extremely difficult. After forging, complex heat treatment is required to achieve ultra-high strength while avoiding brittle fracture. Finally, high-precision geometric surface integrity (hole systems, bearing seats, sealing surfaces, etc.) must be achieved on large-volume parts. Taking the C919 main landing gear piston rod as an example, its production line needs to overcome 35 processes. The difficulty is not only "whether a qualified product can be made", but also whether the stability, consistency, traceability and capacity building of the process can be transformed into sustainable mass production capability. This puts forward extremely high engineering management requirements for the systematic constraints of the manufacturing cycle (the manufacturing cycle of large passenger aircraft landing gear is about six months).

[0004] The machining of aircraft landing gear typically involves multiple processes, including turning, milling, drilling, boring, and honing. Currently, deep hole machining is generally preceded by milling on a gantry milling machine. However, since gantry milling machines cannot perform turning, subsequent turning operations on a lathe are required. Alternatively, a large milling-turning machining center can be used. While this center can perform both turning and milling simultaneously, it lacks support at the workpiece ends. To prevent deformation of the unsupported parts, the workpiece removal rate cannot be too high, significantly reducing machining efficiency and increasing the difficulty of maintaining machining accuracy. Besides these drawbacks, large-scale machining centers are also very expensive. After milling and turning, the workpiece needs to be transferred to other equipment for deep hole drilling, honing, and boring. Existing machining equipment consists of general-purpose machine tools, and there are no dedicated large landing gear machining machines. Due to the limited functionality of existing machine tools, the aforementioned machining processes must be completed by transferring the workpiece between multiple machine tools with different functions. Specifically, the workpiece needs to be clamped, transferred, and repositioned multiple times between different lathes, milling machines, drilling machines, boring machines, and honing machines. Each time the machine tool is changed, the workpiece needs to be re-clamped and repositioned. The conversion of the clamping datum inevitably introduces positioning errors, and the multiple clamping during the transfer process leads to an increase in cumulative errors. For high-precision parts such as landing gear, the cumulative errors caused by multiple clampings often fail to meet design tolerance requirements, seriously affecting machining accuracy. Differences in the precision status of different machine tools and the clamping habits of operators make it difficult to guarantee the machining consistency of batches of parts, increasing the difficulty of quality control. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by proposing a crane-gantry composite machining center and a machining method.

[0006] The technical means employed in this invention are as follows: A crane-gantry composite machining center includes: Machine tool bed; A crossbeam mounted on the machine tool bed and capable of moving along the first horizontal direction; A machining spindle module is mounted on the crossbeam and is capable of moving in the second horizontal and vertical directions. The machining spindle module is capable of holding milling cutters and / or turning tools. A rotary table is mounted on the machine tool bed for clamping the workpiece to be processed and performing rotary motion. The axis of rotation of the rotary table is parallel to the first horizontal direction or the second horizontal direction. A composite machining module is disposed on the machine tool bed and opposite to the rotary table. The composite machining module includes at least one of a drilling assembly, a boring assembly, and a honing assembly. The axis of rotation of the rotary table is parallel to the feed direction of the drilling assembly, the boring assembly, or the honing assembly. And a flat clamping worktable for horizontally clamping the workpiece to be processed, wherein the flat clamping worktable can clamp and support the workpiece to be processed in the processing area when the workpiece to be processed is subjected to a processing operation that does not require the workpiece to be processed to rotate, and move away from the rotation processing area or the flipping area when the workpiece to be processed is subjected to a processing operation that requires the workpiece to be processed to rotate or flip.

[0007] Furthermore, the machine tool bed includes a bed base and at least two support walls disposed on the bed base; At least two of the supporting walls include two supporting walls arranged opposite each other; The crossbeam is installed on top of the two opposing supporting walls.

[0008] Furthermore, the supporting wall has two, three, or four surfaces.

[0009] Furthermore, the axis of rotation of the turntable is parallel to or perpendicular to the wall surface of the supporting wall on which the crossbeam is installed; When there is no supporting wall on the side where the turntable is located, the turntable is mounted on the bed base; When a support wall is provided on one side of the turntable, the turntable is mounted on the support wall or the bed base.

[0010] Furthermore, the axis of rotation of the turntable is parallel to or perpendicular to the wall surface of the supporting wall on which the crossbeam is installed; When a support wall is provided on the side where the composite processing module is located, the support wall is provided with a clearance opening for the composite processing module.

[0011] Furthermore, it also includes an automatic loading and unloading device for loading and unloading materials.

[0012] Furthermore, the automatic loading and unloading device is a ground rail type automatic loading and unloading device, a robot type automatic loading and unloading device, or an overhead crane type automatic loading and unloading device.

[0013] Furthermore, the automatic loading and unloading device is located on one side of the machine tool bed. When the automatic loading and unloading device is located on one side of the machine tool bed and a support wall is provided on the side of the machine tool bed where the automatic loading and unloading device is located, the support wall is provided with loading and unloading ports.

[0014] Furthermore, it also includes a central support assembly and / or a top module assembly disposed within the machine tool bed on the side closer to the composite machining module; The central support assembly includes a central support and a central support drive mechanism capable of driving the central support to move so that the central support is coaxial with the turntable. The top module assembly includes a top and a top drive mechanism capable of driving the top to move so that the top is coaxial with the turntable.

[0015] Furthermore, the composite machining module includes a mounting base, at least one of a drilling assembly, a boring assembly, or a honing assembly mounted on the mounting base, and / or a mounting base drive assembly for driving the movement of the mounting base; or the composite machining module is fixedly disposed and includes any one of the drilling assembly, the boring assembly, or the honing assembly.

[0016] Furthermore, the top module assembly is fixed on the mounting base.

[0017] Furthermore, the machining spindle module includes a spindle head, which can change the angle between its axis and the axis of at least one of the X-axis, Y-axis and Z-axis of the machine tool by swinging or rotating.

[0018] Furthermore, it also includes a support worktable for horizontally supporting the flat clamping worktable, wherein a positioning and locking device is provided between the bottom of the support worktable and the bed base of the machine tool bed, and a positioning and locking device is provided between the top of the support worktable and the bottom of the flat clamping worktable.

[0019] Furthermore, it also includes a lifting mechanism disposed within the machine tool bed between the rotary table and the composite machining module, the lifting mechanism being capable of driving the flat clamping worktable to lift and lower; When the workpiece to be processed is subjected to a processing procedure that does not require the workpiece to be processed to rotate, the lifting mechanism can drive the flat clamping worktable to be lifted and positioned and locked between the flat clamping worktable and the supporting worktable that enters between the flat clamping worktable and the bed base. When a machining operation requiring the workpiece to rotate or be flipped is performed, after the support worktable between the flat clamping worktable and the bed base is removed, the lifting mechanism can drive the flat clamping worktable to descend, so that the flat clamping worktable is away from the rotation or flipping area of ​​the workpiece.

[0020] Furthermore, it also includes a lifting mechanism disposed within the machine tool bed between the rotary table and the composite machining module. The lifting mechanism can drive the flat clamping worktable to be lifted and lowered. When the workpiece to be machined is to be processed in a machining operation that does not require the workpiece to be rotated, the lifting mechanism can lift and support the flat clamping worktable so that the workpiece to be machined is located in the machining area for processing. When the workpiece to be machined is to be processed in a machining operation that requires the workpiece to be rotated or flipped, the lifting mechanism can lower the flat clamping worktable so that the flat clamping worktable is away from the workpiece rotation area or flipping area.

[0021] Furthermore, the lifting mechanism is a hydraulic cylinder driven lifting mechanism, a motor screw driven lifting mechanism, or a wedge block driven lifting mechanism.

[0022] A machining method using the overhead crane gantry machining center described in this application includes: The workpiece to be processed is horizontally clamped on the flat clamping worktable and moved to the processing area of ​​the machine tool; When a machining process is performed on the workpiece that does not require the workpiece to rotate, the workpiece is fixed by the flat clamping worktable and located in the machining area. Then, the corresponding tool or the corresponding machining component on the composite machining module is clamped by the machining spindle module to perform the corresponding machining process on the workpiece. When a machining process that requires the workpiece to be rotated is performed, after the turntable clamps the workpiece, the flat clamping table separates from the workpiece and moves out of the rotary machining area. The turntable drives the workpiece to rotate, and then the corresponding tool or the corresponding machining component on the composite machining module is clamped by the machining spindle module to perform the corresponding machining process on the workpiece. When one side of the workpiece is finished and needs to be flipped for processing on the other side, the turntable clamps the workpiece, the flat clamping table separates from the workpiece and moves out of the flipping area, the turntable drives the workpiece to flip, and then the flat clamping table is sent into the processing area and horizontally clamps the workpiece. The turntable separates from the workpiece, and then the corresponding tool or the corresponding processing component on the composite processing module is clamped by the processing spindle module to perform the corresponding process processing on the workpiece.

[0023] Furthermore, it also includes: The flat clamping worktable is conveyed to the lifting mechanism by an automatic loading and unloading device, and the lifting mechanism drives the flat clamping worktable to be lifted. The automatic loading and unloading device transports the support worktable to the lower side of the flat clamping worktable. The support worktable is positioned and locked with the bed base. The lifting mechanism drives the flat clamping worktable to descend, so that the flat clamping worktable falls onto the support worktable and is positioned and locked. This allows the workpiece to be processed to be located in the processing area for processing operations that do not require the workpiece to rotate. When a machining operation requiring the workpiece to rotate is performed, the lifting mechanism drives the flat clamping table to rise and fall, thereby separating the supporting table from the flat clamping table and moving the workpiece to the turntable clamping position for clamping. After the supporting table separates from the bed base, the supporting table is moved out of the workpiece rotation area by an automatic loading and unloading device. The flat clamping table separates from the workpiece, and after the lifting mechanism drives the flat clamping table to fall, the flat clamping table is moved out of the workpiece rotation area by an automatic loading and unloading device. When one side of the workpiece needs to be processed and then flipped for processing on the other side, the lifting mechanism drives the flat clamping table to lift, thereby separating the supporting table from the flat clamping table and moving the workpiece to be processed to the turntable clamping position for clamping. After the supporting table is separated from the bed base, it is moved out of the workpiece flipping area by an automatic loading and unloading device. The flat clamping table is separated from the workpiece, and after being lowered by the lifting mechanism, it is moved out of the workpiece flipping area by an automatic loading and unloading device. After the turntable drives the workpiece to be processed to rotate, the flat clamping worktable is again conveyed to the lifting mechanism by the automatic loading and unloading device. The lifting mechanism drives the flat clamping worktable to be lifted to the workpiece to be processed and positions and clamps the workpiece. The turntable separates from the workpiece to be processed. Then, the support worktable is conveyed to the lower side of the flat clamping worktable by the automatic loading and unloading device. The support worktable is positioned and locked with the bed base. The lifting mechanism drives the flat clamping worktable to descend so that the flat clamping worktable falls onto the support worktable and is positioned and locked, so that the workpiece to be processed is located in the processing area for processing on the other side.

[0024] Furthermore, it includes: when the workpiece to be processed is to be processed in a processing step that does not require the workpiece to be processed to rotate, the flat clamping worktable is transported to the lifting mechanism by an automatic loading and unloading device and positioned and locked. The lifting mechanism drives the flat clamping worktable to be lifted and supported, so that the workpiece to be processed is located in the processing area for processing steps that do not require the workpiece to be processed to rotate. When a machining process requiring the workpiece to rotate is performed, the lifting mechanism drives the flat clamping table to lift the workpiece to move to the turntable clamping position for clamping. Then, the flat clamping table separates from the workpiece, and the lifting mechanism drives the flat clamping table to descend. The automatic loading and unloading device then moves the flat clamping table out of the rotary machining area. The turntable drives the workpiece to rotate and performs the corresponding machining process. When one side of the workpiece is finished and needs to be flipped for processing on the other side, the lifting mechanism drives the flat clamping table to lift it, moving the workpiece to the turntable clamping position for clamping. Then, the flat clamping table separates from the workpiece, and the lifting mechanism drives the flat clamping table to descend. The automatic loading and unloading device then moves the flat clamping table out of the flipping area. The turntable drives the workpiece to flip, and the automatic loading and unloading device then transports the flat clamping table to the lifting mechanism. The lifting mechanism drives the flat clamping table to lift it to the workpiece to position and clamp it. The turntable then separates from the workpiece for processing on the other side.

[0025] Furthermore, the workpiece to be processed and the flat clamping worktable are sequentially transported to or removed from the machine tool by an automatic loading and unloading device; or the flat clamping worktable holding the workpiece to be processed is transported to or removed from the machine tool by an automatic loading and unloading device.

[0026] Furthermore, it also includes: supporting the free end of the workpiece to be processed by means of a top module assembly and / or a center support assembly.

[0027] Compared with the prior art, the overhead crane gantry composite machining center disclosed in this invention has the following beneficial effects: The overhead crane gantry composite machining center disclosed in this invention features a crossbeam, a machining spindle module, a composite machining module, a rotary table, and a flat clamping worktable. The machining spindle module holds milling cutters and / or turning tools to complete milling and turning operations on the workpiece (complex workpieces such as landing gear). By setting various machining components on the composite machining module, drilling, boring, and honing operations can be performed on the landing gear. The crossbeam, machining spindle module, composite machining module, rotary table, and flat clamping worktable of this machine tool enable the one-time machining of complex workpieces such as landing gear. This eliminates the problems of existing technologies where complex workpieces such as aircraft landing gear are transferred between different types of machine tools, resulting in increased cumulative errors from multiple clamping operations, long process flow cycles, impact on machining consistency from multiple clamping operations, high costs of dedicated equipment, and large floor space requirements. In other words, the workpiece is initially clamped only once within the machine tool, and all subsequent processes are completed continuously in the same coordinate system, completely eliminating the accumulation of positioning errors introduced by datum conversion during multi-machine tool transfers. Attached Figure Description

[0028] Figure 1 This is an axial view of an embodiment of the overhead crane gantry composite machining center disclosed in this invention; Figure 2 for Figure 1 The internal structure diagram of the machine tool after removing the machine tool bed is disclosed in the Chinese embodiment; Figure 3 A structural diagram of one embodiment of an automatic loading and unloading device; Figure 4 for Figure 1 The structural diagram of the structure between the internal composite machining module and the rotary table after removing the machine tool bed is disclosed in the Chinese embodiment; Figure 5 This is a structural diagram of another embodiment of the overhead crane gantry composite machining center disclosed in this invention; Figure 6 This is a structural diagram of another embodiment of the overhead crane gantry composite machining center disclosed in this invention; Figure 7 This is a structural diagram of another embodiment of the lifting mechanism in the overhead crane gantry composite machining center disclosed in this invention; Figure 8 This is another implementation structural diagram showing the relationship between two supporting walls with crossbeams and other supporting walls in the overhead crane gantry composite machining tool disclosed in this invention, where the supporting walls have three or four sides. Figure 9 This is another implementation structural diagram showing the relationship between two supporting walls with crossbeams and other supporting walls in the overhead crane gantry composite machining tool disclosed in this invention, where the supporting walls have three or four sides; Figure 10 This is another implementation structural diagram showing the relationship between two supporting walls with crossbeams and other supporting walls in the overhead crane gantry composite machining tool disclosed in this invention, where the supporting walls have three or four sides; Figure 11 This is another implementation structural diagram showing the relationship between two supporting walls with crossbeams and other supporting walls in the overhead crane gantry composite machining tool disclosed in this invention, where the supporting walls have three or four sides. Figure 12 This is another implementation structural diagram showing the relationship between two supporting walls with crossbeams and other supporting walls in the overhead crane gantry composite machining tool disclosed in this invention, where the supporting walls have three or four sides. In the diagram: 1. Machine tool bed; 10. Bed base; 11. Support wall; 110. First support wall; 12. Compound machining module clearance opening; 13. Loading / unloading port; 14. Central support assembly; 140. Central support; 141. Central support drive mechanism; 15. Center module assembly; 150. Center; 151. Center drive structure; 2. Crossbeam; 3. Machining spindle module; 4. Turntable; 5. Flat clamping worktable; 6. Compound machining module; 60. Mounting base; 61. Drilling assembly; 62. Boring assembly; 63. Honing assembly; 64. Mounting base drive assembly; 7. Lifting mechanism; 8. Support worktable; 80. Positioning and locking device; 9. Automatic loading / unloading device; 90. Loading / unloading device base; 91. Loading / unloading turntable; 92. First loading / unloading worktable; 93. Second loading / unloading worktable. Detailed Implementation

[0029] Example 1 like Figure 1 , Figure 2 , Figure 3 and Figure 4 The image shows a crane-gantry composite machining center disclosed in this invention, comprising: The machine tool bed 1 includes a bed base 10 and four support walls 11 arranged on the bed base 10, with the four support walls 11 arranged in pairs opposite to each other. One of the pairs of opposing support walls 11 is provided with a crossbeam 2 on top, which can move along the first horizontal direction. That is, the pair of opposing support walls 11 is provided with a guide rail and a drive device on top. The crossbeam 2 spans across the two support walls 11 and is connected to the guide rail. The drive device can drive the crossbeam 2 to move on the top of the support wall 11. The drive device can be composed of components such as a servo motor and a ball screw, or it can be a linear motor or other drive device. A machining spindle module 3 is mounted on the crossbeam 2 and is capable of moving along the second horizontal and vertical directions. The machining spindle module 3 is capable of holding milling cutters and / or turning tools. Specifically, the machining spindle module 3 includes components such as a spindle box, a slide, and a slide saddle, so that the spindle head of the machining spindle module 3 can move along the second horizontal and vertical directions. A turntable 4 is mounted on the machine tool bed 1 for clamping the workpiece to be processed and performing rotary motion. The axis of rotation of the turntable 4 is parallel to the first horizontal direction. In this embodiment, the turntable 4 is fixed on a support wall 11 on one side, and the axis of rotation of the turntable 4 is in the same direction as the movement direction of the crossbeam 2. A composite machining module 6 is disposed on the machine tool bed 1 opposite to the rotary table 4. The composite machining module 6 includes at least one of a drilling assembly 61, a boring assembly 62, and a honing assembly 63. The axis of rotation of the rotary table 4 is parallel to the feed direction of the drilling assembly 61, the boring assembly 62, or the honing assembly 63. Specifically, the composite machining module 6 can select one or more of the drilling assembly 61, the boring assembly 62, or the honing assembly 63 according to the machining process required for the workpiece to be processed. The number of each machining assembly can also be set as needed. For example, one or two drilling assemblies 61 are provided to process holes of different sizes. In addition, a flat clamping worktable 5 is provided for horizontally clamping the workpiece to be processed. The flat clamping worktable 5 can clamp and support the workpiece to be processed in the processing area when the workpiece to be processed is subjected to a processing operation that does not require the workpiece to be processed to rotate. When the workpiece to be processed is subjected to a processing operation that requires the workpiece to be processed to rotate or to flip, it is moved away from the rotation processing area or the flipping area. In this embodiment, the flat clamping worktable 5 is provided with a clamp for clamping the workpiece to be processed. The clamp can be a pressure plate clamp or other types of clamp. Preferably, a hydraulically driven pressing clamp is used. The flat clamping worktable 5 is also provided with an electrical interface for communication or electrical signal transmission with the CNC system of the machine tool and / or a hydraulic or pneumatic interface for hydraulic or pneumatic transmission. These are all prior art, and the specific structure will not be described in detail.

[0030] In this embodiment, since the machine tool is equipped with a crossbeam, a machining spindle module, a composite machining module, a turntable, and a flat clamping table, the milling spindle module can clamp the milling cutter and / or turning tool to be machined on the workpiece (complex such as landing gear) to complete milling and turning related processes. By setting various machining components on the composite machining module, drilling, boring, and honing processes can be completed on the landing gear. Thus, the machine tool disclosed in this application can complete the machining of complex workpieces such as landing gear in one go, avoiding the problems of multiple clamping caused by the need to transfer between different machine tools and different types of machine tools in the prior art, resulting in increased cumulative errors, long process flow cycles, impact on machining consistency, high investment costs of special equipment, and large footprint.

[0031] Furthermore, in this embodiment, since the machine tool bed 1 includes a four-sided support wall 11 structure, and the crossbeam 2 spans across the top of two oppositely arranged support walls 11, this structure effectively improves the overall rigidity of the machine tool and its components, thereby improving the machining accuracy of the machine tool, that is, effectively ensuring the machining accuracy of complex workpieces such as landing gear.

[0032] Furthermore, in this embodiment, the axis of rotation of the turntable 4 is parallel to the wall surface of the support wall 11 on which the crossbeam 2 is installed; the composite machining module 6 is installed on the bed base 10 and located on the side opposite to the turntable 4. The support wall 11 of the machine tool bed 1 near the side where the composite machining module 6 is located is provided with a composite machining module clearance opening 12, that is, the length of the bed base 10 on this side is greater than the distance between the two opposite support walls 11, so that part of the bed base is located outside the support wall 11. By providing the composite machining module clearance opening 12 on the support wall 11 on this side, the composite machining module 6 can be partially located inside the machine tool bed 1 and partially located outside the machine tool bed 1. This structure can further reduce the volume enclosed by the four support walls 11 of the machine tool bed 1, reducing the space volume. At the same time, due to the reduced distance between the support walls 11, the overall rigidity of the machine tool and its components is further improved, thereby improving the machining accuracy of the machine tool, that is, effectively ensuring the machining accuracy of complex workpieces such as landing gear.

[0033] Furthermore, it also includes an automatic loading and unloading device 9 for loading and unloading materials. By setting the automatic loading and unloading device 9, the automatic loading and unloading of components such as the workpiece to be processed, the flat clamping worktable, and the supporting worktable can be realized, thereby achieving automated processing.

[0034] Furthermore, the automatic loading and unloading device 9 can be a ground rail type automatic loading and unloading device, a robot type automatic loading and unloading device, or an overhead crane type automatic loading and unloading device. That is, different automatic loading and unloading devices 9 can be selected as needed to complete the automatic loading and unloading of components such as the workpiece to be processed, the flat clamping worktable, and the supporting worktable, thereby realizing automated processing.

[0035] Furthermore, the automatic loading and unloading device 9 is located on one side of the machine tool bed 1. When the automatic loading and unloading device 9 is located on one side of the machine tool bed 1 and the machine tool bed 1 is provided with a support wall 11 on the side where the automatic loading and unloading device 9 is located, the support wall 11 is provided with loading and unloading ports 13.

[0036] Specifically, in this embodiment, the automatic loading and unloading device 9 adopts a ground-rail type automatic loading and unloading device. Loading and unloading ports 13 are provided on the support wall 11 on the side where the ground-rail type automatic loading and unloading device is located. In this embodiment, placing the automatic loading and unloading device on the outside of the machine tool bed 1 further reduces the volume enclosed by the four support walls 11 of the machine tool bed 1, thus reducing the space volume. Simultaneously, due to the reduced distance between the support walls 11, the overall rigidity of the machine tool and its components is further improved, thereby improving the machining accuracy of the machine tool, effectively ensuring the machining accuracy of complex workpieces such as landing gear.

[0037] In this embodiment, the ground-rail type automatic loading and unloading device includes a loading and unloading device base 90, a loading and unloading turntable 91, and a first loading and unloading station 92 and a second loading and unloading station 93 disposed on the loading and unloading device base 90 on both sides of the loading and unloading turntable 91; the loading and unloading turntable 91 can automatically load the workpiece to be processed, the flat clamping worktable, and the support worktable on the first loading and unloading station 92 and the second loading and unloading station 93 into or remove them from the machine tool.

[0038] Furthermore, it also includes a central support assembly 14 and / or a top module assembly 15 disposed within the machine tool bed 1 on the side near the composite machining module 6; The central support assembly 14 includes a central support 140 and a central support drive mechanism 141 capable of driving the central support 140 to move so that the central support 140 is coaxial with the turntable 4. The central support drive mechanism 141 can drive the central support 140 to move in the vertical direction, or in the horizontal plane along a direction perpendicular to the axis of rotation of the turntable or parallel to the axis of rotation of the turntable. The top point module assembly 15 includes a top point 150 and a top point drive mechanism 151 capable of driving the top point 150 to move so that the top point 150 is coaxial with the turntable 4. By setting the center support assembly 14 and / or the top point module assembly 15, the free end of the workpiece to be processed can be supported to improve the processing accuracy of the workpiece to be processed.

[0039] Further, the composite machining module 6 includes a mounting base 60, at least one of a drilling assembly 61, a boring assembly 62, and a honing assembly 63 mounted on the mounting base 60, and / or a mounting base drive assembly 64 for driving the movement of the mounting base 60; or the composite machining module 6 is fixedly disposed and includes any one of the drilling assembly 61, the boring assembly 62, or the honing assembly 63. In this embodiment, the composite machining module 6 includes a mounting base 60 and a mounting base drive assembly 64, which can drive different machining components (drilling assembly 61, boring assembly 62, or honing assembly 63) mounted on the mounting base 60 to perform different processes on the workpiece to be machined. The mounting base drive assembly 64 can be a linear drive device or a rotary drive device, etc.; or when the composite machining module 6 includes only one of the drilling assembly 61, the boring assembly 62, and the honing assembly 63, the composite machining module 6 is fixedly disposed.

[0040] Furthermore, the top-mount module assembly 15 is fixed on the mounting base 60, thereby allowing the movement of the composite processing module 6 to make the position of the top-mount module assembly 15 correspond to that of the workpiece to be processed, so as to support the workpiece to be processed. At the same time, the installation of the top-mount module assembly 15 on the composite processing module 6 effectively simplifies the structure.

[0041] Furthermore, the machining spindle module 3 includes a spindle head, which can change the angle between the axis of the spindle head and the axis of at least one of the X-axis, Y-axis and Z-axis of the machine tool by swinging or rotating.

[0042] Specifically, the machining spindle module 3 is mounted on the crossbeam 2. Preferably, the spindle head is a double-swivel head, which enables it to perform double-swivel motion around the A-axis and C-axis. The end of the spindle head is equipped with an automatic tool changer spindle, which can hold milling cutters and / or turning tools. Through the slide ram, slide saddle and A / C axis movement of the double-swivel head of the machining spindle module 3, the machining spindle module 3 can realize multi-posture and multi-angle machining in three-dimensional space.

[0043] Furthermore, it also includes a support worktable 8 for horizontally supporting the flat clamping worktable 5. The bottom of the support worktable 8 is provided with a positioning and locking device 80 between it and the bed base 10. The top of the support worktable 8 is provided with a positioning and locking device 80 between it and the bottom of the flat clamping worktable 5. By setting the support worktable 8, the flat clamping worktable 5 can be supported, thereby ensuring that the workpiece to be processed has sufficient support strength when performing processes that do not require the workpiece to be processed to rotate, so as to ensure processing accuracy. At the same time, it can also avoid the flat clamping worktable 5 being too large in size (thickness), which would be inconvenient for handling during loading and unloading.

[0044] Furthermore, it also includes a lifting mechanism 7 disposed within the machine tool bed 1 between the rotary table 4 and the composite machining module 6, the lifting mechanism 7 being capable of driving the flat clamping worktable 5 to lift and lower; When a machining process is performed on the workpiece that does not require the workpiece to rotate, the lifting mechanism 7 can drive the flat clamping worktable 5 to rise and fall and then position and lock it between the support worktable 8 that enters between the flat clamping worktable 5 and the bed base 10. When a machining operation requiring the workpiece to be rotated or flipped is performed, after the support worktable 8 between the flat clamping worktable 5 and the bed base 10 is removed, the lifting mechanism 7 can drive the flat clamping worktable 5 to descend, so that the flat clamping worktable 5 is away from the rotation area or flipping area of ​​the workpiece to be processed.

[0045] Specifically, in this embodiment, a lifting mechanism 7 is located within the machine tool bed 1 between the rotary table 4 and the composite machining module 6. The lifting mechanism 7 can drive the flat clamping worktable 5 to rise and fall, thereby facilitating the insertion of the support worktable 8 into the bottom of the flat clamping worktable 5 or the removal of the support worktable 8 from the bottom of the flat clamping worktable 5. This ensures that the machine tool can complete different processing steps on the workpiece. The lifting mechanism 7 can be a hydraulic cylinder-driven lifting mechanism, a motor screw-driven lifting mechanism, a wedge-driven lifting mechanism, or other types of lifting mechanisms. Figure 4 The diagram shown is a schematic of a motor-driven lead screw lifting mechanism; Figure 7 The diagram shown is a schematic of a wedge-driven lifting mechanism.

[0046] In this embodiment, the supporting worktable 8 may be omitted, and the lifting mechanism 7 can be used to lift and support the flat clamping worktable 5. That is, the lifting mechanism 7 has sufficient rigidity and supporting force, which can lift and support the flat clamping worktable 5 so that the worktable is located in the processing area when the workpiece is to be processed in a processing step that does not require the workpiece to rotate. When the workpiece is to be processed in a processing step that requires the workpiece to rotate or to be flipped, the flat clamping worktable 5 is lowered so that the flat clamping worktable 5 is away from the workpiece rotation area or flipping area. This further simplifies the structure, reduces the number of steps in the processing of the workpiece, saves processing time, and improves processing efficiency.

[0047] This invention discloses a crane-gantry composite machining center that integrates all the processes required for machining landing gear, including turning, milling, drilling, boring, and grinding. It also innovatively incorporates a workpiece exchange mechanism via a flat clamping mechanism and a rotary table. The workpiece undergoes only one initial clamping within the machine tool, and all subsequent processes are completed continuously in the same coordinate system, completely eliminating the accumulation of positioning errors introduced by datum conversion during multi-machine tool transfers. The design of a single machine tool, a single coordinate system, and automated clamping reduces the factors affecting machining consistency from "multiple machine tools + multiple operators" to "one machine tool + standardized program." Repeatability and positioning accuracy are unaffected by human factors. Key load-bearing components of the landing gear, such as the main lifting outer cylinder and piston rod, have extremely high precision requirements for the mating geometry of the hole system, bearing seats, and sealing surfaces. This application controls positional errors within the machine tool's geometric accuracy range, providing a precision foundation for fatigue-resistant manufacturing. During processing, multiple machine tool operations are eliminated, and the workpiece exchange path between the clamping mechanism and the turntable is short and the movements are simple. This significantly reduces the material waiting time in traditional multi-machine tool operations, providing equipment-level optimization space for the systemic constraint of a six-month manufacturing cycle for large passenger aircraft landing gear. Moreover, the workpiece is always in the same closed processing environment, with consistent cutting fluid system, temperature field, and cleanliness, avoiding surface damage and contamination during transportation. The processes are tightly integrated, and the relative positional accuracy of boring and honing is guaranteed by the geometric accuracy of the machine tool. The surface condition before honing is maintained by the same environment, achieving true integration of fatigue-resistant manufacturing from process design to equipment implementation, delaying the initiation of fatigue cracks in the landing gear. One machine tool replaces more than five traditional general-purpose machine tools, significantly reducing the number of equipment, floor space, personnel configuration, and maintenance costs, which is of great significance for the localization of landing gear manufacturing. This application integrates for the first time a high-rigidity gantry structure, five-axis linkage of the spindle head, rotary turning of the turntable, integrated drilling, boring and grinding, and automated workpiece exchange into a single platform, forming a special composite solution for the characteristics of the entire landing gear process. This provides core equipment support for my country's large aircraft landing gear to move from "domestic production" to "autonomy".

[0048] Example 2 like Figure 5 The following is another embodiment of the overhead crane gantry composite machining center disclosed in this invention. The difference between this embodiment and embodiment 1 is that, in embodiment 1, the machine tool bed 1 includes a bed base 10 and four supporting walls 11. In this embodiment, the machine tool bed 1 includes a bed base 10 and two supporting walls 11. A crossbeam 2 is provided on the top of the two supporting walls 11. There are no supporting walls 11 on the other two sides of the bed base 10. The turntable 4 and the composite machining module 6 are respectively set on the bed base 10 without supporting walls 11. The other parts of this embodiment are the same as those in embodiment 1, and will not be described in detail here.

[0049] Example 3 like Figure 6The following is another embodiment of the overhead crane gantry composite machining center disclosed in this invention. The difference between this embodiment and embodiment 2 is that, in embodiment 2, the turntable 4 and the composite machining module 6 are respectively set on the bed base 10 without the support wall 11. That is, in embodiment 2, the axis of rotation of the turntable 4 is consistent with (parallel to) the direction of movement of the crossbeam 2. In this embodiment, the machine bed 1 also includes the bed base 10 and two support walls 11. The top of the two support walls 11 is provided with the crossbeam 2. The turntable 4 and the composite machining module 6 are respectively set on the two sides with the support wall 11. The axis of rotation of the turntable 4 is perpendicular to the direction of movement of the crossbeam 2. The turntable 4 is fixed on the support wall 11 on one side. The support wall 11 on the other side is provided with a composite machining module clearance opening 12, so that part of the bed base 10 is located outside the support wall 11. The composite machining module 6 is fixed on the bed base 10 and part of the composite machining module 6 is located inside the machine bed 1 and part of it is located outside the machine bed 1. The other parts of this embodiment are the same as those of embodiment 2, and will not be described in detail here.

[0050] Example 4 Another embodiment of the overhead crane gantry composite machining center disclosed in this invention differs from embodiment 2 in that, in embodiment 2, the machine tool bed 1 includes a bed base 10 and two support walls 11, while in this embodiment, the machine tool bed 1 includes a bed base 10 and three support walls 11, wherein two support walls 11 are arranged opposite each other and have a crossbeam 2 on top, and a support wall 11 is also provided on the other side of the bed base 10, while no support wall 11 is provided on the fourth side of the bed base 10, the turntable 4 is provided on the support wall 11, and the composite machining modules 6 are respectively provided on the side of the bed base 10 without support walls 11. The other parts of this embodiment are the same as those of embodiment 2, and will not be described in detail here.

[0051] Example 5 Another embodiment of the overhead crane gantry composite machining center disclosed in this invention differs from embodiment 2 in that, in embodiment 2, the machine tool bed 1 includes a bed base 10 and two support walls 11. In this embodiment, the machine tool bed 1 includes a bed base 10 and three support walls 11, wherein two support walls 11 are arranged opposite each other and have a crossbeam 2 on the top. A support wall 11 is also provided on the other side of the bed base 10, and no support wall 11 is provided on the fourth side of the bed base 10. The turntable 4 is set on the bed base 10 on the side without support walls 11, and a composite machining module clearance opening 12 is provided on the support wall 11 on the other side, so that part of the bed base 10 is located outside the support walls 11. The composite machining module 6 is fixed on the bed base 10, and part of the composite machining module 6 is located inside the machine tool bed 1 and part is located outside the machine tool bed 1. Other parts in this embodiment are the same as in embodiment 2, and will not be described in detail here.

[0052] Example 6 Another embodiment of the overhead crane gantry composite machining center disclosed in this invention differs from embodiment 3 in that, in embodiment 3, the machine tool bed 1 includes a bed base 10 and two supporting walls 11, while in this embodiment, the machine tool bed 1 includes a bed base 10 and three supporting walls 11, wherein the two supporting walls 11 are arranged opposite each other and a crossbeam 2 is provided on the top, and a supporting wall 11 is also provided on the other side of the bed base 10. The other parts of this embodiment are the same as those of embodiment 3, and will not be described in detail here.

[0053] Example 7 Another embodiment of the overhead crane gantry composite machining center disclosed in this invention differs from embodiment 2 in that, in embodiment 2, the automatic loading and unloading device 9 is located on the outside of the machine tool bed 1, while in this embodiment, the automatic loading and unloading device 9 is located inside the machine tool bed 1.

[0054] In various embodiments of this application, the two supporting walls 11 used to support the crossbeam 2 can be of the same height or of different heights. When the heights are different, the structure of the crossbeam 2 can be adjusted accordingly to ensure that it can be effectively supported on the supporting wall 11 and can move on top of the supporting wall 11. The structural form of the remaining supporting walls 11 is not limited. Several schematic structures are given below, such as 8. Figure 9 , Figure 10 , Figure 11 and Figure 12As shown below, for ease of description, this supporting wall will be referred to as the third supporting wall, and the two supporting walls used to support the crossbeam will be referred to as the first supporting wall and the second supporting wall: 1. The bottom of the third supporting wall is fixedly connected to the bed frame base, and both ends of the third supporting wall are connected to the first and second supporting walls. The height of the third supporting wall is less than the height of the first and second supporting walls. The turntable can be fixed to the third supporting wall or to the bed frame base; 2. The bottom of the third supporting wall is fixedly connected to the bed frame base, and one end of the third supporting wall is connected to the first or second supporting wall. The height of the third supporting wall is the same as the height of the first and second supporting walls. The turntable can be fixed to the third supporting wall or to the bed frame base; 3. The bottom of the third supporting wall is not fixedly connected to the bed frame base, and both ends of the third supporting wall are connected to the first and second supporting walls. The height of the third supporting wall is less than the height of the first and second supporting walls. 4. The bottom of the third support wall is not fixedly connected to the bed base, and both ends of the third support wall are connected to the first and second support walls. The height of the third support wall is less than that of the first and second support walls. The third support wall is located on one side of the composite processing module. The gap between the bottom of the third support wall and the bed base forms a clearance opening for the composite processing module, or a clearance opening for the composite processing module is further processed at the bottom of the third support wall. 5. The bottom of the third support wall is fixedly connected to the bed base. Neither end of the third support wall is connected to the first or second support wall. The height of the third support wall can be the same as or different from that of the first and second support walls. The turntable can be fixed to the third support wall or the bed base. 6. The third support wall is a structure consisting of multiple discontinuous segments connecting the first and second support walls. The above are only schematic examples of several structures of support wall 11. Other structures can be set as needed and are not listed here. In this application, the support wall 11 can be a closed structure or a support structure formed by multiple columns. In some other embodiments of this application, the axis of rotation of the turntable 4 may also be at a certain angle to the direction of movement of the crossbeam 2. In this invention, the first horizontal direction and the second horizontal direction may be two mutually perpendicular directions within the horizontal direction or set at a certain angle. In this application, when a support wall 11 is provided on the side where the turntable is provided, the turntable 4 may be directly set on the support wall 11 or directly set on the bed base.

[0055] Example 8 A machining method using the overhead crane gantry machining center described in this application includes: The workpiece to be processed is horizontally clamped on the flat clamping worktable 5 and moved to the processing area of ​​the machine tool. When a machining process is performed on the workpiece that does not require rotation of the workpiece, the workpiece is fixed by the flat clamping worktable 5 and located in the machining area. Then, the corresponding tool or the corresponding machining component on the composite machining module 6 is clamped by the machining spindle module 3 to perform the corresponding machining process on the workpiece. When a machining process requiring the workpiece to rotate is performed, the turntable 4 clamps the workpiece, the flat clamping table 5 separates from the workpiece and moves out of the rotary machining area, the turntable 4 drives the workpiece to rotate, and then the machining spindle module 3 clamps the corresponding tool or the corresponding machining component (drilling component 61, boring component 62 or honing component 63) on the composite machining module 6 to perform the corresponding machining process on the workpiece. When one side of the workpiece is finished and needs to be flipped for processing on the other side, the turntable 4 clamps the workpiece, the flat clamping table 5 separates from the workpiece and moves out of the flipping area, the turntable 4 drives the workpiece to flip, and then the flat clamping table 5 is sent into the processing area and horizontally clamps the workpiece. The turntable 4 separates from the workpiece, and then the corresponding tool or the corresponding processing component on the composite processing module 6 is clamped by the processing spindle module 3 to perform the corresponding process processing on the workpiece.

[0056] Furthermore, it also includes: conveying the flat clamping worktable 5 to the lifting mechanism 7 through the automatic loading and unloading device 9, wherein the lifting mechanism 7 drives the flat clamping worktable 5 to be lifted; The automatic loading and unloading device 9 transports the support worktable 8 to the lower side of the flat clamping worktable 5. The support worktable 8 is positioned and locked with the bed base 10. The lifting mechanism 7 drives the flat clamping worktable 5 to descend, so that the flat clamping worktable 5 falls onto the support worktable 8 and is positioned and locked. This allows the workpiece to be processed to be located in the processing area for processing operations that do not require the workpiece to be processed to rotate. When a machining operation requiring the workpiece to rotate is performed, the lifting mechanism 7 drives the flat clamping table 5 to lift, thereby separating the supporting table 8 from the flat clamping table 5, and moving the workpiece to be processed to the clamping position of the turntable 4 for clamping; after the supporting table 8 is separated from the bed base 10, the supporting table 8 is moved out of the workpiece rotation area by the automatic loading and unloading device 9; the flat clamping table 5 is separated from the workpiece, and after being driven down by the lifting mechanism 7, the flat clamping table 5 is moved out of the workpiece rotation area by the automatic loading and unloading device 9. When one side of the workpiece needs to be processed and needs to be flipped for processing on the other side, the lifting mechanism 7 drives the flat clamping table 5 to lift so that the supporting table 8 and the flat clamping table 5 are separated, and the workpiece to be processed moves to the clamping position of the turntable 4 for clamping; after the supporting table 8 is separated from the bed base 10, the supporting table 8 is moved out of the workpiece flipping area by the automatic loading and unloading device 9; the flat clamping table 5 is separated from the workpiece to be processed, and after the lifting mechanism 7 drives the flat clamping table 5 to descend, the flat clamping table 5 is moved out of the workpiece flipping area by the automatic loading and unloading device 9. After the turntable 4 drives the workpiece to be processed to rotate, the flat clamping worktable 5 is transported to the lifting mechanism 7 again by the automatic loading and unloading device 9. The lifting mechanism 7 drives the flat clamping worktable 5 to be lifted to the workpiece to be processed and positions and clamps the workpiece. The turntable 4 separates from the workpiece to be processed. Then, the support worktable 8 is transported to the lower side of the flat clamping worktable 5 by the automatic loading and unloading device 9. The support worktable 8 is positioned and locked with the bed base 10. The lifting mechanism 7 drives the flat clamping worktable 5 to descend so that the flat clamping worktable 5 falls onto the support worktable 8 and is positioned and locked, so that the workpiece to be processed is located in the processing area for processing on the other side.

[0057] Furthermore, the workpiece to be processed and the flat clamping worktable 5 are sequentially transported to or removed from the machine tool by the automatic loading and unloading device 9; or the workpiece to be processed is fixed on the flat clamping worktable 5 and then transported to or removed from the machine tool by the automatic loading and unloading device 9.

[0058] Furthermore, it also includes: supporting the free end of the workpiece to be processed by the top module assembly 14 and / or the center support assembly 15.

[0059] Example 9 A machining method using the overhead crane gantry machining center described in this application includes: When a machining process is performed on the workpiece that does not require the workpiece to rotate, the flat clamping worktable 5 is transported to the lifting mechanism 7 by the automatic loading and unloading device 9 and positioned and locked. The lifting mechanism 7 drives the flat clamping worktable 5 to lift and support it, so that the workpiece is located in the machining area for machining processes that do not require the workpiece to rotate. When a machining process requiring the workpiece to rotate is performed, the lifting mechanism 7 drives the flat clamping table 5 to lift the workpiece to the clamping position of the turntable 4 for clamping. Then, the flat clamping table 5 separates from the workpiece, and the lifting mechanism 7 drives the flat clamping table 5 to descend. The automatic loading and unloading device 9 then moves the flat clamping table 5 out of the rotary machining area. The turntable 4 drives the workpiece to rotate and performs the corresponding machining process. When one side of the workpiece is finished and needs to be flipped for processing on the other side, the lifting mechanism 7 drives the flat clamping table 5 to lift it, moving the workpiece to the clamping position of the turntable 4 for clamping. Then, the flat clamping table 5 separates from the workpiece. After the lifting mechanism 7 drives the flat clamping table 5 to descend, the automatic loading and unloading device 9 moves the flat clamping table 5 out of the flipping area. After the turntable 4 drives the workpiece to flip, the automatic loading and unloading device 9 transports the flat clamping table 5 to the lifting mechanism 7. The lifting mechanism 7 drives the flat clamping table 5 to be lifted to the workpiece to position and clamp it. The turntable 4 separates from the workpiece for processing on the other side.

[0060] Furthermore, the automatic loading and unloading device 9 sequentially transports the workpiece to be processed and the flat clamping worktable 5 to or from the machine tool; or the automatic loading and unloading device 9 transports the flat clamping worktable 5 holding the workpiece to be processed to or from the machine tool.

[0061] Furthermore, the free end of the workpiece to be processed is supported by the top module assembly 14 and / or the center support assembly 15.

[0062] 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 equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A crane-gantry composite machining center, characterized in that, include: Machine tool bed; A crossbeam mounted on the machine tool bed and capable of moving along the first horizontal direction; A machining spindle module is mounted on the crossbeam and is capable of moving in the second horizontal and vertical directions. The machining spindle module is capable of holding milling cutters and / or turning tools. A rotary table is mounted on the machine tool bed for clamping the workpiece to be processed and performing rotary motion. The axis of rotation of the rotary table is parallel to the first horizontal direction or the second horizontal direction. A composite machining module is disposed on the machine tool bed and opposite to the rotary table. The composite machining module includes at least one of a drilling assembly, a boring assembly, and a honing assembly. The axis of rotation of the rotary table is parallel to the feed direction of the drilling assembly, the boring assembly, or the honing assembly. And, a flat clamping worktable for horizontally clamping the workpiece to be processed, wherein the flat clamping worktable can clamp and support the workpiece to be processed in the processing area when the workpiece to be processed is subjected to a processing operation that does not require the workpiece to be processed to rotate, and when the workpiece to be processed is subjected to a processing operation that requires the workpiece to be processed to rotate or to be flipped, the flat clamping worktable is moved away from the rotation processing area or the flipping area. The system also includes a lifting mechanism located within the machine tool bed between the rotary table and the composite machining module. This lifting mechanism drives the flat clamping table to lift and lower, such that when a machining operation that does not require workpiece rotation is performed, the flat clamping table clamps and supports the workpiece in the machining area. When a machining operation requiring workpiece rotation or flipping is performed, the flat clamping table moves away from the rotation machining area or flipping area. When the workpiece is switched from a machining operation requiring workpiece rotation to one requiring workpiece rotation, or when the workpiece is flipped, the flat clamping table is driven to lift, moving the workpiece to the rotary table clamping position, thus enabling the workpiece to be switched between the flat clamping table and the rotary table.

2. The overhead crane / gantry composite machining center according to claim 1, characterized in that: The machine tool bed includes a bed base and at least two supporting walls disposed on the bed base; At least two of the supporting walls include two supporting walls arranged opposite each other; The crossbeam is installed on top of the two opposing supporting walls.

3. The overhead crane / gantry composite machining center according to claim 2, characterized in that: The supporting wall has two, three, or four sides.

4. The overhead crane / gantry composite machining center according to claim 3, characterized in that: The axis of rotation of the turntable is parallel to or perpendicular to the wall surface of the supporting wall on which the crossbeam is installed. When there is no supporting wall on the side where the turntable is located, the turntable is mounted on the bed base; When a support wall is provided on one side of the turntable, the turntable is mounted on the support wall or the bed base.

5. The overhead crane / gantry composite machining center according to claim 3, characterized in that: The axis of rotation of the turntable is parallel to or perpendicular to the wall surface of the supporting wall on which the crossbeam is installed. When a support wall is provided on the side where the composite processing module is located, the support wall is provided with a clearance opening for the composite processing module.

6. The overhead crane / gantry composite machining center according to claim 2, characterized in that: It also includes automatic loading and unloading devices for loading and unloading materials.

7. The overhead crane / gantry composite machining center according to claim 6, characterized in that: The automatic loading and unloading device is a ground rail type automatic loading and unloading device, a robot type automatic loading and unloading device, or an overhead crane type automatic loading and unloading device.

8. The overhead crane / gantry composite machining center according to claim 7, characterized in that: The automatic loading and unloading device is located on one side of the machine tool bed. When the automatic loading and unloading device is located on one side of the machine tool bed and a support wall is provided on the side of the machine tool bed where the automatic loading and unloading device is located, the support wall is provided with loading and unloading ports.

9. The overhead crane / gantry composite machining center according to claim 1, characterized in that: It also includes a central support assembly and / or a top module assembly disposed within the machine tool bed on the side near the composite machining module; The central support assembly includes a central support and a central support drive mechanism capable of driving the central support to move so that the central support is coaxial with the turntable. The top module assembly includes a top and a top drive mechanism capable of driving the top to move so that the top is coaxial with the turntable.

10. The overhead crane / gantry composite machining center according to claim 9, characterized in that: The top module component is fixed on the composite processing module.

11. The overhead crane / gantry composite machining center according to claim 1, characterized in that: The composite machining module includes a mounting base, at least one of a drilling assembly, a boring assembly, or a honing assembly mounted on the mounting base, and a mounting base drive assembly for driving the movement of the mounting base; or the composite machining module is fixedly disposed and includes any one of the drilling assembly, the boring assembly, or the honing assembly.

12. The overhead crane / gantry composite machining center according to claim 1, characterized in that: The machining spindle module includes a spindle head, which can change the angle between its axis and at least one of the X-axis, Y-axis and Z-axis of the machine tool by swinging or rotating.

13. The overhead crane / gantry composite machining center according to any one of claims 1 to 12, characterized in that: It also includes a support worktable for horizontally supporting the flat clamping worktable, wherein a positioning and locking device is provided between the bottom of the support worktable and the bed base of the machine tool bed, and a positioning and locking device is provided between the top of the support worktable and the bottom of the flat clamping worktable.

14. The overhead crane / gantry composite machining center according to claim 13, characterized in that: When a machining process is performed on the workpiece that does not require the workpiece to rotate, the lifting mechanism can drive the flat clamping worktable to rise and fall and then position and lock it between the support worktable that enters between the flat clamping worktable and the bed base. When a machining operation requiring the workpiece to rotate or be flipped is performed, after the support worktable between the flat clamping worktable and the bed base is removed, the lifting mechanism can drive the flat clamping worktable to descend, so that the flat clamping worktable is away from the rotation or flipping area of ​​the workpiece.

15. The overhead crane / gantry composite machining center according to claim 14, characterized in that: The lifting mechanism is a hydraulic cylinder driven lifting mechanism, a motor screw driven lifting mechanism, or a wedge block driven lifting mechanism.

16. The overhead crane / gantry composite machining center according to any one of claims 1 to 12, characterized in that: The lifting mechanism can lift and support the flat clamping table so that the workpiece is located in the processing area when the workpiece is being processed in a processing step that does not require the workpiece to rotate. When the workpiece is being processed in a processing step that requires the workpiece to rotate or to be flipped, the flat clamping table can be lowered so that the flat clamping table is away from the workpiece's rotation or flipping area.

17. The overhead crane / gantry composite machining center according to claim 16, characterized in that: The lifting mechanism is a hydraulic cylinder driven lifting mechanism, a motor screw driven lifting mechanism, or a wedge block driven lifting mechanism.

18. A machining method using the overhead crane-gantry composite machining center as described in claim 1, characterized in that, include: The workpiece to be processed is horizontally clamped on the flat clamping worktable and moved to the processing area of ​​the machine tool; When a machining process is performed on the workpiece that does not require the workpiece to rotate, the workpiece is fixed by the flat clamping worktable and located in the machining area. Then, the corresponding tool or the corresponding machining component on the composite machining module is clamped by the machining spindle module to perform the corresponding machining process on the workpiece. When a machining process that requires the workpiece to be rotated is performed, after the turntable clamps the workpiece, the flat clamping table separates from the workpiece and moves out of the rotary machining area. The turntable drives the workpiece to rotate, and then the corresponding tool or the corresponding machining component on the composite machining module is clamped by the machining spindle module to perform the corresponding machining process on the workpiece. When one side of the workpiece is finished and needs to be flipped for processing on the other side, the turntable clamps the workpiece, the flat clamping table separates from the workpiece and moves out of the flipping area, the turntable drives the workpiece to flip, and then the flat clamping table is sent into the processing area and horizontally clamps the workpiece. The turntable separates from the workpiece, and then the corresponding tool or the corresponding processing component on the composite processing module is clamped by the processing spindle module to perform the corresponding process processing on the workpiece.

19. The machining method of the overhead crane gantry machining center according to claim 18, characterized in that, Also includes: The flat clamping worktable is conveyed to the lifting mechanism by an automatic loading and unloading device, and the lifting mechanism drives the flat clamping worktable to be lifted. The automatic loading and unloading device transports the support worktable to the lower side of the flat clamping worktable. The support worktable is positioned and locked with the bed base. The lifting mechanism drives the flat clamping worktable to descend, so that the flat clamping worktable falls onto the support worktable and is positioned and locked. This allows the workpiece to be processed to be located in the processing area for processing operations that do not require the workpiece to rotate. When a machining operation requiring the workpiece to rotate is performed, the lifting mechanism drives the flat clamping table to lift, thereby separating the supporting table from the flat clamping table and moving the workpiece to the turntable clamping position for clamping. After the supporting table separates from the bed base, the supporting table is moved out of the workpiece rotation area by an automatic loading and unloading device. The flat clamping table separates from the workpiece, and after being lowered by the lifting mechanism, it is moved out of the workpiece rotation area by the automatic loading and unloading device. When one side of the workpiece needs to be processed and then flipped for processing on the other side, the lifting mechanism drives the flat clamping table to lift, thereby separating the supporting table from the flat clamping table and moving the workpiece to be processed to the turntable clamping position for clamping. After the supporting table is separated from the bed base, it is moved out of the workpiece flipping area by an automatic loading and unloading device. The flat clamping table is separated from the workpiece, and after being lowered by the lifting mechanism, it is moved out of the workpiece flipping area by an automatic loading and unloading device. After the turntable drives the workpiece to be processed to rotate, the flat clamping worktable is again conveyed to the lifting mechanism by the automatic loading and unloading device. The lifting mechanism drives the flat clamping worktable to be lifted to the workpiece to be processed and positions and clamps the workpiece. The turntable separates from the workpiece to be processed. Then, the support worktable is conveyed to the lower side of the flat clamping worktable by the automatic loading and unloading device. The support worktable is positioned and locked with the bed base. The lifting mechanism drives the flat clamping worktable to descend so that the flat clamping worktable falls onto the support worktable and is positioned and locked, so that the workpiece to be processed is located in the processing area for processing on the other side.

20. The machining method of the overhead crane gantry composite machining center according to claim 18, characterized in that, Also includes: When a machining process is performed on a workpiece that does not require rotation of the workpiece, the flat clamping worktable is transported to the lifting mechanism by an automatic loading and unloading device and positioned and locked. The lifting mechanism drives the flat clamping worktable to be lifted and supported, so that the workpiece is located in the machining area for machining processes that do not require rotation of the workpiece. When a machining process requiring the workpiece to rotate is performed, the lifting mechanism drives the flat clamping table to lift the workpiece to move to the turntable clamping position for clamping. Then, the flat clamping table separates from the workpiece, and the lifting mechanism drives the flat clamping table to descend. The automatic loading and unloading device then moves the flat clamping table out of the rotary machining area. The turntable drives the workpiece to rotate and performs the corresponding machining process. When one side of the workpiece is finished and needs to be flipped for processing on the other side, the lifting mechanism drives the flat clamping table to lift it, moving the workpiece to the turntable clamping position for clamping. Then, the flat clamping table separates from the workpiece, and the lifting mechanism drives the flat clamping table to descend. The automatic loading and unloading device then moves the flat clamping table out of the flipping area. The turntable drives the workpiece to flip, and the automatic loading and unloading device then transports the flat clamping table to the lifting mechanism. The lifting mechanism drives the flat clamping table to lift it to the workpiece to position and clamp it. The turntable then separates from the workpiece for processing on the other side.

21. The machining method of the overhead crane gantry composite machining center according to claim 19 or 20, characterized in that, Also includes: The workpiece to be processed and the flat clamping worktable are sequentially transported to or removed from the machine tool by an automatic loading and unloading device; or the flat clamping worktable holding the workpiece to be processed is transported to or removed from the machine tool by an automatic loading and unloading device.

22. The machining method of the overhead crane gantry composite machining center according to claim 21, characterized in that, Also includes: The free end of the workpiece to be processed is supported by the top module assembly and / or the center support assembly.

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