Numerical control machining center and aerospace part machining method thereof

Abstract

The invention relates to the technical field of numerical control machining, in particular to a numerical control machining center and an aerospace part machining method thereof.The numerical control machining center comprises a machining center body, the machining center body comprises a machining main platform, and a sliding mechanism sliding in the axial direction is arranged on the surface of the machining main platform and comprises a sliding platform; the machining center comprises a machining center body, a sliding platform is arranged on the machining center body, double machining stations are arranged above the sliding platform side by side, each machining station is provided with a positioning assembly used for fixing a workpiece, the machining center body is installed on the sliding platform through a rotating assembly, and cutting devices corresponding to the machining stations are arranged at the top of the machining center body and comprise tool assemblies capable of automatically switching tool bits. And a cooling system for cooling the cutter is arranged on one side of the cutting device. Through cooperation of the sliding mechanism and the double machining stations, cutters are automatically switched according to actual requirements, in the cutting process, through cooperation of the cooling system and the vacuum gettering assembly, the low-temperature state is always kept in the machining process, and efficient, high-precision and large-batch automatic production is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of numerical control machining, in particular to a numerical control machining center and a machining method for aerospace parts. BACKGROUND

[0002] Traditional precise part machining transition relies on ordinary equipment and manual operation, and the size consistency and behavior tolerance fluctuation are large, so it is difficult to maintain stability to reach the micron-level precision requirement.

[0003] Most of them are single machine and single process machining, and the surface cannot continue to be polished after one-time machining, so further processes are needed, and the workpiece needs to be transferred and machined again, the clamping times are many, the auxiliary time is long, the complex structure needs to be clamped and connected many times, the cycle is long, and the forming precision is poor.

[0004] And in the process of continuous machining and transfer, it is impossible to achieve continuous cooling and continuous environment, the workpiece is obviously deformed due to thermal expansion and cold contraction, the yield is low, and the demand for precision machining cannot be met.

[0005] When small batches of multiple varieties are produced, the adjustment cycle is long, the response is slow, and automatic mass production cannot be realized. SUMMARY

[0006] The application aims to provide a numerical control machining center and a machining method for aerospace parts, so as to solve the problems in the background art, and the application automatically switches the tool according to the actual demand through the cooperation of the sliding mechanism and the double machining stations, completes efficient and high-precision machining cutting, and realizes the advantages of high precision and large-batch automatic production by cooperating the cooling system and the vacuum impurity suction assembly during the cutting process.

[0007] To achieve the above-mentioned purpose, the application provides the following technical scheme: a numerical control machining center, comprising a machining center main body, the machining center main body comprising a machining main platform, the machining main platform being provided with a sliding mechanism sliding in the axial direction on the surface, the sliding mechanism comprising a sliding platform, the sliding platform being provided with double machining stations arranged side by side above the sliding platform, each machining station being provided with a positioning assembly for fixing a workpiece, the positioning assembly being installed on the sliding platform through a rotating assembly, the machining center main body being provided with a cutting device corresponding to each machining station on the top, the cutting device comprising a tool assembly capable of automatically switching tool heads, and the cutting device being provided with a cooling system on one side for cooling the tool.

[0008] As a further scheme of the present application, the machining main platform is further provided with a vacuum impurity suction assembly below the machining main platform, the vacuum impurity suction assembly comprises a vacuum pump and a impurity collecting box in communication with the vacuum pump, the machining main platform panel serves as the top plate of the impurity collecting box, a plurality of rectangular holes are arranged in an array on the machining main platform panel, impurities fall into the impurity collecting box along the rectangular holes, the vacuum pump is connected with an external impurity discharge pipeline, and the impurities in the impurity collecting box are sucked by negative pressure and discharged along the impurity discharge pipeline.

[0009] As a further scheme of the present application, the cutter assembly comprises a cutter box, a switching motor is arranged in the cutter box, a rotating plate is arranged at the shaft end of the switching motor, a first cutter head and a second cutter head are symmetrically arranged below the rotating plate, the first cutter head and the second cutter head extend downward and can pass through the bottom plate of the cutter box, and a through hole is arranged on the bottom plate of the cutter box for the first cutter head and the second cutter head to extend out.

[0010] As a further scheme of the present application, a first air cylinder and a second air cylinder are arranged on the rotating plate and connected with the first cutter head and the second cutter head respectively, the shaft end of the first air cylinder is connected with the top of the first cutter head, the shaft of the first air cylinder is telescopic to drive the first cutter head to reciprocate vertically, so as to control the length of the first cutter head extending out of the bottom plate of the cutter box, and the shaft end of the second air cylinder is connected with the top of the second cutter head, the shaft of the first air cylinder is telescopic to drive the first cutter head to reciprocate vertically, so as to control the length of the first cutter head extending out of the bottom plate of the cutter box.

[0011] As a further scheme of the present application, the cutting device further comprises a support cross beam, horizontal sliding rails are arranged on the side surfaces of the support cross beam, sliding block mounting plates are slidingly arranged on the horizontal sliding rails, sliding air cylinders are arranged on the side portions of each sliding block mounting plate, and the shaft ends of the sliding air cylinders are connected with the side surfaces of the sliding block mounting plates vertically; The sliding block mounting plates are vertically arranged, a mounting plate is vertically arranged on the middle portion of each sliding block mounting plate, mounting holes are arranged on the mounting plate, a lifting air cylinder is arranged above the mounting plate, the shaft of the lifting air cylinder passes through the mounting hole, the shaft end of the lifting air cylinder is connected with the top plate of the cutter box, and the shaft of the lifting air cylinder is telescopic to drive the cutter box to move up and down as a whole.

[0012] As a further scheme of the present application, a group of axial sliding members are symmetrically arranged on the two side surfaces of the sliding platform, the axial sliding members comprise horizontally arranged upper and lower guide grooves, the two horizontal guide grooves are arranged oppositely, a sliding plate is arranged between the two horizontal guide grooves, a driving air cylinder is arranged on one side of the sliding plate, a connecting hole is arranged on the sliding plate, a connecting shaft is arranged in the connecting hole, a bearing is arranged on the connecting shaft, and the sliding platform is mounted on the two side portions through the bearing.

[0013] As a further scheme of the present application, the positioning assembly comprises a positioning groove, a plurality of positioning holes are arranged in the positioning groove, a positioning rod is screwed in a selected positioning hole according to the forming shape of a different workpiece to be machined, a fixing hole matched with the positioning rod is arranged on the bottom of the workpiece to be machined, and the bottom of the positioning groove is connected with the rotating assembly.

[0014] As a further scheme of the present application, the rotating assembly comprises a rotating motor arranged inside the sliding platform, the rotating motor axially penetrates the panel of the sliding platform, the shaft of the rotating motor is provided with a rotating disc, the rotating disc is fixedly arranged at the bottom of the positioning groove, and the rotating disc is provided with a position sensor around the rotating disc.

[0015] As a further scheme of the present application, the cooling system comprises a nitrogen liquid tank, the top of the nitrogen liquid tank is provided with an air inlet pipeline and parallelly arranged air outlet pipelines, the air outlet pipelines are provided with flow rate control valves, the end of the air outlet pipelines is provided with a buffer tank, the buffer tank is provided with a plurality of cooling holes arranged in an array opposite to the double machining stations, and each cooling hole is provided with a nozzle which automatically rotates along the hole axis.

[0016] As a further scheme of the present application, the machining method of the aerospace parts of the numerical control machining center comprises the following steps. Step one: workpiece initial mold positioning and installation: moving the sliding platform to the feeding position, pre-machining the workpiece initial mold into a rectangular block body matched with the positioning groove, and positioning the positioning rod with the fixed hole shaft hole; Step two: starting the cooling system: opening the flow rate control valve, and after the liquid nitrogen is gasified, the gasified liquid nitrogen flows into the buffer tank along the air outlet pipelines, and after the buffer tank is filled, the gasified liquid nitrogen is continuously sprayed through all the nozzles; Step three: starting the vacuum impurity collection assembly: opening the flow rate control valve while opening the vacuum pump, and forming a negative pressure space in the impurity collection tank; Step four: switching the cutting tool: starting the switching motor to drive the rotating plate to rotate, driving the first cutting head and the second cutting head to rotate, rotating the selected first cutting head to the side close to the sliding platform, and then starting the first air cylinder to drive the first cutting head to move downward to extend out of the cutting tool box; Step five: cutting head positioning: starting the sliding cylinder to drive the cutting tool box to slide along the support cross beam, aligning the cross beam with the machining station in the transverse direction, and then starting the lifting cylinder to drive the cutting tool box to move downward to contact the surface of the workpiece to be machined; Step six: cutting machining: according to the program setting, the first cutting head starts to cut at high speed, the horizontal sliding rail slides to realize transverse tool feeding, and the sliding platform slides along the axial sliding part to realize longitudinal tool feeding; The position sensor continuously senses the position of the workpiece, controls the rotating motor to drive the rotating disc to rotate, drives the workpiece to rotate in the circumferential direction, and performs cutting machining; Step seven: tool retraction and tool switching: stopping the rotation of the first cutting head and lifting it, starting the switching motor again to drive the rotating plate to rotate, driving the second cutting head to rotate to the side close to the sliding platform, and then starting the second air cylinder to drive the second cutting head to move downward to extend out of the cutting tool box; Step eight: tool switching machining: according to the program setting, the second cutting head starts to cut at high speed, the horizontal sliding rail slides to realize transverse tool feeding, and the sliding platform slides along the axial sliding part to realize longitudinal tool feeding; The position sensor continuously senses the position of the workpiece, and controls the rotary motor to drive the rotating disc to rotate, so that the workpiece rotates in the circumferential direction, cutting machining is carried out until complete forming, and finally the connecting rib is cut off. Step nine: complete machining: the second cutter head is retracted and raised, the cutter box returns to the initial position, the sliding platform moves to the initial position, and the workpiece is unloaded.

[0017] Compared with the prior art, the beneficial effects of the present application are: the present application comprises a machining center body, the machining center body comprises a machining main platform, the surface of the machining main platform is provided with a sliding mechanism sliding in the axial direction, the sliding mechanism comprises a sliding platform, and a double machining station is arranged above the sliding platform in parallel, the double machining station can realize synchronous machining of two parts at the same time, save steps and realize high efficiency.

[0018] Each machining station is provided with a positioning assembly for fixing a workpiece, the positioning assembly is installed on the sliding platform through a rotating assembly, the machining center body is provided at the top with a cutting device corresponding to each machining station, the cutting device comprises a tool assembly capable of automatically switching cutter heads, and the cutting device is provided on one side with a cooling system for cooling the tool. Through the cooperation of the sliding mechanism and the double machining station, the tool is automatically switched according to actual needs, high-efficiency high-precision machining and cutting are completed, and the cooling system and the vacuum impurity suction assembly are matched in the cutting process, so that the machining process always maintains a low temperature state, realizing high precision and large-scale automatic production. It also has the following advantages: (1) The vacuum impurity suction assembly forms a suction state of negative pressure in the impurity collection box through the vacuum pump, and real-time suction of machining impurities, while cooperating with the cooling system to drive the cooling gas to maintain one-way continuous flow, protecting the cutter head while improving the machining precision.

[0019] (2) The tool assembly switches the cutter head at any time through the switching motor, which is used for machining of different shapes or precision, realizes simultaneous machining of multiple processes, does not need to be transferred for machining again, greatly reduces the clamping times, shortens the auxiliary time, and the complex structure does not need to be changed for clamping and switching multiple times, so the cycle is short and the forming precision is poor.

[0020] (3) The cutting device is matched with the sliding block mounting plate through the horizontal sliding rail to realize horizontal displacement, and is driven by the lifting cylinder to realize vertical displacement. A group of axial sliding members are symmetrically arranged on both sides of the sliding platform to realize longitudinal displacement.

[0021] (4) The positioning assembly is positioned by cooperating with the bottom of the workpiece to be machined through the positioning rod, so that the positioning is stable, and the clamping marks and clamping deformation of the workpiece surface caused by conventional clamping are avoided.

[0022] (6) The rotating assembly comprises a rotating motor arranged inside the sliding platform, and the displacement and rotating angle are sensed in real time through a position sensor to control the rotating angle of the travel displacement meter, so that the cutting device is more accurately matched for synchronous cutting, the cutting precision is high, and large-batch automatic production is realized.

[0023] (7) The cooling system comprises a nitrogen liquid tank, a flow rate control valve is arranged on the gas outlet pipeline, the gas outlet flow rate is controlled through the flow rate control valve, the cooling gas is buffered in the buffer tank, the gas pressure in the buffer tank is kept consistent, the pressure of the buffer tank along each cooling hole is the same, no temperature difference is generated on the workpiece, and a nozzle rotating along the hole shaft is arranged at each cooling hole. The rotating gas outlet makes the gas flow form a turbulent flow, and each direction of the tool head is cooled.

[0024] (8) The machining method of the aerospace parts of the numerical control machining center realizes size consistency and small behavior tolerance fluctuation through multi-stage continuous machining, maintains stability to reach micron-level precision requirements, processes once through clamping, has short cycle and poor forming precision, and continuously maintains a cooling environment, the workpiece is evenly heated, the yield is high, and automatic large-batch production is realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an overall assembly structure diagram of the application Figure 1 ; Figure 2 It is an overall assembly structure diagram of the application Figure 2 ; Figure 3 It is an internal structure diagram of the application Figure 4 It is an internal structure assembly diagram of the application Figure 5 It is a tool assembly structure diagram of the application Figure 6 It is a positioning assembly diagram of the application Figure 7 It is a nozzle mounting structure diagram of the application

[0026] In the figure: 1- machining center main body, 101- machining main platform, 2- overall control box, 3- cutting device, 301- tool assembly, 311- tool box, 312- first cylinder, 313- rotating plate, 314- first tool head, 315- switching motor, 316- second cylinder, 317- second tool head, 302- lifting cylinder, 321- support cross beam, 322- horizontal slide rail, 323- sliding cylinder, 324- sliding block mounting plate, 325- mounting plate, 4- cooling system, 401- nitrogen liquid tank, 402- gas outlet pipeline, 403- flow control valve, 404- gas inlet pipeline, 405- buffer tank, 451- cooling hole, 406- nozzle, 5- vacuum impurity collection assembly, 501- impurity collection tank, 502- impurity discharge pipeline, 503- vacuum pump, 504- rectangular hole, 6- sliding platform, 601- axial slider, 611- horizontal guide groove, 612- sliding plate, 7- rotating assembly, 701- rotating motor, 702- rotating disc, 703- position sensor, 8- positioning assembly, 801- positioning groove, 802- positioning hole, 803- positioning rod. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. Embodiment 1

[0028] Refer to the accompanying Figure 1 - accompanying Figure 4 A numerical control machining center, comprising a machining center main body 1, the machining center main body comprising a machining main platform 101, a rack and a body sheet metal are arranged around the machining main platform, wrapping the internal components and realizing a stable machining environment. The rack is further provided with an overall control box 2, and the overall control box is provided with a controller and a power supply.

[0029] The machining main platform surface is provided with a sliding mechanism sliding in the axial direction, the sliding mechanism comprising a sliding platform 6, a group of axial sliders 601 is symmetrically arranged on both sides of the sliding platform, the axial sliders comprising horizontally arranged upper and lower horizontal guide grooves 611, the two horizontal guide grooves are arranged opposite to each other, and a sliding plate 612 is arranged between the two horizontal guide grooves in cooperation. A drive cylinder is arranged on one side of the sliding plate, a connecting hole is arranged on the sliding plate, a connecting shaft is arranged in the connecting hole, a bearing is arranged on the connecting shaft, and the bearing is arranged in cooperation with the two side portions of the sliding platform.

[0030] Start the drive cylinder to drive the sliding plate to reciprocate along the horizontal guide groove, so as to realize the longitudinal displacement of the workpiece.

[0031] Refer to the accompanying Figure 6Above the sliding platform are two parallel processing stations. Each processing station has a positioning component 8 for fixing the workpiece. The positioning component includes a positioning groove 801, with different positioning grooves corresponding to different workpiece models. The positioning groove has several positioning holes 802. Depending on the shape of the workpiece, a positioning rod 803 is screwed into the selected positioning hole. The bottom of the workpiece has a fixing hole that mates with the positioning rod. When the workpiece is placed in the positioning groove, the fixing hole mates with the corresponding positioning rod, ensuring stable positioning of the workpiece without circumferential or vertical displacement.

[0032] The positioning component 8 is mounted on the sliding platform via the rotating component 7. The bottom of the positioning groove is connected to the rotating component. The rotating component 7 includes a rotating motor 701 disposed inside the sliding platform. The rotating motor extends axially through the sliding platform panel. A rotating disk 702 is provided at the end of the rotating motor shaft. The rotating disk is fixedly assembled with the bottom of the positioning groove 801. Position sensors 703 are provided around the rotating disk.

[0033] The position sensor 703 senses and captures the real-time position of the workpiece. The rotary motor 701 starts and drives the rotary disk 702 to rotate. The rotation angle is automatically controlled and the cutting head is used to achieve cutting.

[0034] The top of the main body of the machining center is equipped with a cutting device 3 corresponding to each machining station. The cutting device also includes a support beam 321. A horizontal slide rail 322 is provided on the side of the support beam. A slider mounting plate 324 is slidably fitted on the horizontal slide rail. A sliding cylinder 323 is provided on the side of each slider mounting plate. The shaft end of the sliding cylinder is perpendicularly connected to the side of the slider mounting plate. The sliding cylinders of the two processing stations are set independently, which can realize synchronous or asynchronous processing steps.

[0035] The slider mounting plate is set vertically, and the middle of the slider mounting plate is vertically provided with mounting plate 325. The mounting plate is provided with mounting holes, and a lifting cylinder 302 is provided above the mounting plate. The shaft of the lifting cylinder passes through the mounting holes, and the end of the lifting cylinder shaft is connected to the top plate of the tool box. When the lifting cylinder is started, the lifting cylinder shaft is driven to extend and retract, thereby driving the tool box to move up and down as a whole.

[0036] See appendix Figure 5 The cutting device includes a tool assembly 3 with an automatically switchable cutting head. The tool assembly includes a tool box 311, within which a switching motor 315 is installed. A rotating plate 313 is located at the end of the switching motor shaft. A first cutting head 314 and a second cutting head 317 are symmetrically arranged below the rotating plate. The first cutting head is a chip-cutting head, and the second cutting head is another type of non-standard cutting head or a precision grinding tool. The rotational speed of the first and second cutting heads is automatically controlled according to the machining process and the material of the workpiece.

[0037] The first and second cutting heads extend downward through a cutter box bottom plate, and the cutter box bottom plate is provided with through holes for the first and second cutting heads to extend out.

[0038] The switching motor 315 is started to drive the rotating plate to rotate, and the first and second cutting heads rotate synchronously to switch the first and second cutting heads.

[0039] The rotating plate is provided with a first cylinder 312 and a second cylinder 316 connected to the first and second cutting heads respectively, the first cylinder shaft end is connected to the top of the first cutting head, and the first cylinder shaft is extended and retracted to drive the first cutting head to reciprocate vertically to control the length of the first cutting head extending out of the cutter box bottom plate, and the second cylinder shaft end is connected to the top of the second cutting head, and the first cylinder shaft is extended and retracted to drive the first cutting head to reciprocate vertically to control the length of the first cutting head extending out of the cutter box bottom plate.

[0040] At the beginning, the first and second cylinder shafts are in the initial state of retraction, when machining with the first cutting head, the first cylinder is started, the first cylinder shaft is extended to drive the first cutting head to move downward and extend out of the bottom plate to meet the use requirements.

[0041] During cutting, the first cylinder 312 adjusts the extension and retraction state of the first cylinder shaft in real time according to the shape of the machining to meet the requirements of convex and concave machining.

[0042] When switching the cutting head, the first cylinder shaft is retracted to the initial position to complete the first process.

[0043] Then the switching motor 315 is started to drive the rotating plate to rotate, and the first and second cutting heads 314 and 317 rotate synchronously to switch the first and second cutting heads.

[0044] The second cylinder is started, the first cylinder shaft is extended to drive the second cutting head to move downward and extend out of the bottom plate to meet the use requirements. During cutting, the second cylinder adjusts the extension and retraction state of the first cylinder shaft in real time according to the shape of the machining to meet the requirements of convex and concave machining to complete the second process. Example 2

[0045] Referring to the accompanying drawings Figure 7 The cutting device is provided with a cooling system on one side for cooling the cutting tool. The cooling system includes a nitrogen liquid tank 401, and the nitrogen liquid tank contains liquid nitrogen.

[0046] The top of the nitrogen liquid tank is provided with an air inlet pipeline 404 and a parallelly arranged air outlet pipeline 402, and the air outlet pipeline is provided with a flow rate control valve, the flow rate control valve 403 is opened, the flow rate is adjusted according to the needs, the liquid nitrogen is ensured to flow out at a constant speed, and the gasification is realized in the process of continuous flowing out.

[0047] The end of the gas outlet pipeline 402 is provided with a buffer tank, and nitrogen continuously fills the buffer tank to achieve stable pressure in the buffer tank 405. The continuous output state is maintained.

[0048] The buffer tank is provided with a plurality of cooling holes 451 arranged in an array opposite the double machining station side, and a spray head 406 automatically rotates along the hole axis at each cooling hole.

[0049] Nitrogen is output along the spray head, and the automatic rotation of the spray head causes the cold air flow to form a vortex state, which cannot directly blow onto the machining tool or workpiece, and cools the tool in all directions and maintains a constant cooling temperature of the workpiece. Embodiment 3

[0050] Referring to the accompanying Figure 2 -Appendix Figure 3 The machining main platform is further provided below with a vacuum impurity suction assembly 5, which includes a vacuum pump 503 and a impurity collection box 501 in communication with the vacuum pump. The machining main platform panel serves as the top plate of the impurity collection box, and a plurality of rows of rectangular holes 504 are arranged in an array on the machining main platform panel. Impurities fall into the impurity collection box along the rectangular holes. The vacuum pump is connected with an external impurity discharge pipeline 502. The impurities in the impurity collection box are sucked by negative pressure and discharged along the impurity discharge pipeline.

[0051] The vacuum pump is started to suck the air in the impurity collection box away to achieve a vacuum space. Through the rectangular holes, the impurities are continuously sucked along the rectangular holes by the air pressure difference generated by the rectangular holes, enter the impurity collection box, and finally are discharged along the impurity discharge pipeline. Embodiment 4

[0052] Referring to the accompanying Figure 1 -Appendix Figure 7 The method for machining aerospace parts of the numerical control machining center comprises the following steps: Step one: workpiece preliminary mold positioning and installation: move the sliding platform to the feeding position, and pre-machining the workpiece preliminary mold into a rectangular block body cooperating with the positioning groove. The positioning rod is positioned in cooperation with the fixed hole shaft hole. Different workpieces are adapted to different sizes of positioning grooves, and the position of the positioning rod is also arranged according to the forming shape of the workpiece.

[0053] Step two: start the cooling system: open the flow rate control valve, and the gaseous liquid nitrogen flows into the buffer tank along the gas outlet pipeline after being gasified, and continuously sprays along all the spray heads after filling the buffer tank; Step three: start the vacuum impurity suction assembly: open the flow rate control valve at the same time as opening the vacuum pump to form a negative pressure space in the impurity collection box; Step four: switch the tool: start the switching motor to drive the rotating plate to rotate, drive the first tool head and the second tool head to rotate, rotate the selected first tool head to the side close to the sliding platform, and then start the first cylinder to drive the first tool head to move downward to extend the tool box; Step five: tool head positioning: start the sliding cylinder to drive the tool box to slide along the support beam, align it with the machining station in the transverse direction, and then start the lifting cylinder to drive the tool box to move downward to contact the surface of the workpiece to be machined; Step six: cutting machining: according to the program setting, the first tool head starts to cut at high speed, the horizontal slide rail slides to realize horizontal tool path, and the sliding platform slides along the axial sliding part to realize longitudinal tool path. The position sensor continuously senses the position of the workpiece, controls the rotary motor to drive the rotating disc to rotate, drives the workpiece to rotate in the circumferential direction, and performs cutting machining. Step seven: tool retraction and tool change: stop the rotation of the first tool head and lift it up, start the switching motor again to drive the rotating plate to rotate, drive the second tool head to rotate to the side close to the sliding platform, and then start the second cylinder to drive the second tool head to move downward to extend out of the tool box. Step eight: tool change machining: according to the program setting, the second tool head starts to cut at high speed, the horizontal slide rail slides to realize horizontal tool path, and the sliding platform slides along the axial sliding part to realize longitudinal tool path. The position sensor continuously senses the position of the workpiece, controls the rotary motor to drive the rotating disc to rotate, drives the workpiece to rotate in the circumferential direction, and performs cutting machining until it is completely formed, and finally cuts off the connecting rib. Step nine: complete machining: retract the second tool head and lift it up, the tool box returns to the initial position, the sliding platform moves to the initial position, and the workpiece is unloaded.

[0054] The two stations can simultaneously and synchronously perform machining processes, or simultaneously and asynchronously perform machining processes to meet different machining requirements.

[0055] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0056] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A CNC machining center, characterized in that: The machining center includes a main body (1), which includes a main machining platform (101). The surface of the main machining platform is provided with a sliding mechanism that slides along the axial direction. The sliding mechanism includes a sliding platform (6). Above the sliding platform are two parallel machining stations. Each machining station is provided with a positioning component (8) for fixing the workpiece. The positioning component is mounted on the sliding platform via a rotating component (7). The top of the machining center is provided with a cutting device (3) corresponding to each machining station. The cutting device includes a tool assembly (301) that can automatically change the tool head. A cooling system (4) for cooling the tool is provided on one side of the cutting device.

2. The CNC machining center according to claim 1, characterized in that: Below the main processing platform, there is also a vacuum impurity removal component (5). The vacuum impurity removal component includes a vacuum pump (503) and an impurity collection box (501) connected to the vacuum pump. The main processing platform panel serves as the top plate of the impurity collection box. The main processing platform panel is provided with several rows of rectangular holes (504). Impurities fall into the impurity collection box along the rectangular holes. The vacuum pump is connected to an external impurity discharge pipeline (502). Impurities in the impurity collection box are drawn out by negative pressure and discharged along the impurity discharge pipeline.

3. The CNC machining center according to claim 2, characterized in that: The tool assembly (301) includes a tool box (311), a switching motor (315) is provided inside the tool box, a rotating plate (313) is provided at the shaft end of the switching motor, and a first cutting head (314) and a second cutting head (317) are symmetrically provided below the rotating plate. The first cutting head and the second cutting head extend downward and can pass through the bottom plate of the tool box. The bottom plate of the tool box is provided with through holes for the first cutting head and the second cutting head to extend out.

4. The CNC machining center according to claim 2, characterized in that: The rotating plate (313) is provided with a first cylinder (312) and a second cylinder (316) respectively connected to the first cutter head and the second cutter head. The shaft end of the first cylinder is connected to the top of the first cutter head. The extension and retraction of the first cylinder shaft drives the first cutter head to reciprocate vertically to control the length of the first cutter head extending out of the bottom plate of the tool box. The shaft end of the second cylinder is connected to the top of the second cutter head. The extension and retraction of the first cylinder shaft drives the first cutter head to reciprocate vertically to control the length of the first cutter head extending out of the bottom plate of the tool box.

5. The CNC machining center according to claim 2, characterized in that: The cutting device (3) also includes a support beam (321), a horizontal slide rail (322) is provided on the side of the support beam, a slider mounting plate (324) is provided on the horizontal slide rail, and a sliding cylinder (323) is provided on the side of each slider mounting plate, with the shaft end of the sliding cylinder vertically connected to the side of the slider mounting plate. The slider mounting plate is set vertically, and the middle of the slider mounting plate is vertically provided with a mounting plate (325). The mounting plate is provided with mounting holes, and a lifting cylinder (302) is provided above the mounting plate. The shaft of the lifting cylinder passes through the mounting hole, and the end of the lifting cylinder shaft is connected to the top plate of the tool box. The extension and retraction of the lifting cylinder shaft drives the tool box to move up and down as a whole.

6. The CNC machining center according to claim 4, characterized in that: The sliding platform (6) is symmetrically provided with a set of axial sliding parts (601) on both sides. The axial sliding parts include horizontal guide grooves (611) arranged vertically. The two horizontal guide grooves are arranged facing each other. A sliding plate (612) is provided between the two horizontal guide grooves. A driving cylinder is provided on one side of the sliding plate. A connecting hole is provided on the sliding plate. A connecting shaft is provided in the connecting hole. A bearing is provided on the connecting shaft. The bearing is used to install the sliding platform with both sides.

7. The CNC machining center according to claim 4, characterized in that: The positioning component (8) includes a positioning groove (801) with several positioning holes. According to the different shapes of the workpieces to be processed, the positioning rod (803) is screwed into the selected positioning hole. The bottom of the workpiece to be processed is provided with a fixing hole that cooperates with the positioning rod. The bottom of the positioning groove is connected to the rotating component (7).

8. The CNC machining center according to claim 7, characterized in that: The rotating assembly (7) includes a rotating motor (701) installed inside the sliding platform. The rotating motor extends axially through the sliding platform panel. A rotating disk (702) is provided at the end of the rotating motor shaft. The rotating disk is fixedly assembled with the bottom of the positioning groove (801). A position sensor (703) is provided around the rotating disk.

9. The CNC machining center according to claim 4, characterized in that: The cooling system (4) includes a nitrogen tank (401), an inlet pipe (404) and an outlet pipe (402) arranged in parallel on the top of the nitrogen tank, a flow rate control valve (403) on the outlet pipe, a buffer box (405) at the end of the outlet pipe, and a number of cooling holes (451) arranged in an array on the side of the buffer box facing the dual processing station, and a nozzle (406) that rotates automatically along the hole axis at each cooling hole.

10. A method for machining aerospace parts in a CNC machining center as described in claim 6, characterized in that: Includes the following steps: Step 1: Positioning and installation of the initial workpiece mold: Move the sliding platform to the feeding position, pre-process the initial workpiece mold into a rectangular block that matches the positioning groove, and position the positioning rod in conjunction with the fixing hole shaft hole; Step 2: Start the cooling system: Open the flow rate control valve, and after the liquid nitrogen is vaporized, it flows into the buffer tank along the outlet pipe. After the buffer tank is full, it is continuously sprayed out through all nozzles. Step 3: Start the vacuum cleaning assembly: Open the flow rate control valve and start the vacuum pump at the same time to create a negative pressure space in the collection box; Step 4: Tool switching: Start the switching motor to drive the rotating plate to rotate, which in turn drives the first and second tool heads to rotate. Rotate the selected first tool head to the side closer to the sliding platform. Then start the first cylinder to drive the first tool head to move downward and extend it out of the tool box. Step 5: Tool head positioning: Start the sliding cylinder to drive the tool box to slide along the support beam and align it with the machining station laterally. Then start the lifting cylinder to drive the tool box to move downward and contact the surface of the workpiece. Step Six: Cutting Process: According to the program settings, the first cutting head rotates at high speed to start cutting, the horizontal slide rail slides to achieve transverse tool movement, and the sliding platform slides along the axial sliding member to achieve longitudinal tool movement; The position sensor continuously senses the position of the workpiece and controls the rotary motor to drive the rotary disk to rotate, causing the workpiece to rotate circumferentially for cutting. Step 7: Tool retraction and replacement: Stop the rotation of the first tool head and raise it. Start the switching motor again to drive the rotating plate to rotate, which will drive the second tool head to rotate to the side close to the sliding platform. Then start the second cylinder to drive the second tool head to move downward and extend out of the tool box. Step 8: Tool Change Machining: According to the program settings, the second tool head rotates at high speed to start cutting, the horizontal slide rail slides to achieve transverse tool movement, and the sliding platform slides along the axial sliding member to achieve longitudinal tool movement; The position sensor continuously senses the position of the workpiece and controls the rotary motor to drive the turntable to rotate, causing the workpiece to rotate circumferentially for cutting until it is fully formed, and finally the connecting rib is cut off. Step 9: Complete machining: Raise the second cutter head, return the tool box to its initial position, move the sliding platform to its initial position, and unload the workpiece.

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