Efficient mirror milling method for super-multiple closed grid integral box bottom

Abstract

The application provides a kind of super multi-closed grid integral box bottom efficient mirror image milling processing method, it is suitable for the continuous processing of super multi-closed grid integral box bottom.The steps are briefly described as follows: first, the milling side and the measuring side are moved to the safe position, and the milling side is quickly moved to the feed position.Next, enable the measuring side to compensate the feed to the initial cutting point, and then enable the milling side to compensate the feed to the cutting point.After completing the cutting in this area, the milling side is closed and the tool is lifted.The measuring side is moved to the next area with compensation, and the milling side is moved to the feed point without compensation.The milling side is started and the tool is cut, and the process is repeated until all areas are completed.Finally, the compensation is closed, the milling side and the measuring side are respectively lifted and retracted to the safe position, and then moved to the initial position to complete the processing.By fine control of the movement of both sides, the application significantly reduces the action of feeding and retracting the tool, and significantly improves the mirror image milling processing efficiency of the super multi-closed grid integral box bottom.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of numerical control machining, in particular to an efficient mirror milling processing method for a super-multiple closed grid integral tank bottom. BACKGROUND

[0002] Mirror milling technology has been widely used in the processing of integral tank bottom products. Since it has the function of on-line wall thickness measurement compensation, it can control the wall thickness within the ideal range, and has become an important technology in the processing of tank bottom products of China's new generation launch vehicle. The traditional mirror milling processing method performs well when dealing with tank bottoms containing a small number of closed areas, but when faced with the integral tank bottom of the new type of launch vehicle fuel tank, its limitations gradually appear.

[0003] With the start of the development of new models such as reusable rockets, the design requirements of integral tank bottoms are becoming more and more complex. In order to strengthen the strength of the integral tank bottom, a plurality of reinforcing ribs are added to the outer surface of the integral tank bottom, resulting in a large number (nearly a thousand) of closed lightening grids on the outer surface of the integral tank bottom. These closed grids cannot be connected by cutting tool paths, bringing unprecedented challenges to mirror milling processing.

[0004] A kind of super large diameter-thickness ratio integral tank bottom equal wall thickness precision machining method is disclosed in the patent document with publication number CN115647744A, relating to the field of tank processing, comprising: clamping the tank bottom, taking the horizontal reference line of the tank bottom blank as the reference, turning the inner surface of the tank bottom according to the theoretical processing amount of the inner surface of the tank bottom, to obtain the processed inner surface;Clamp the tank bottom, take the processed inner surface as the reference, rough turn the outer surface of the tank bottom, stop the rough turning of the outer surface after reaching the turning allowance;Heat aging of the tank bottom after rough turning;Five-axis mirror milling is used to mill the tank bottom thin area and thick area of the outer surface of the tank bottom after heat aging.

[0005] According to the conventional mirror milling processing method, at least one processing program needs to be generated for each closed area. For an integral tank bottom containing a large number of closed areas, the number of processing programs will be very large, which not only increases the complexity of programming, but also brings many inconveniences to production and processing. In addition, the feed and retract speeds of each processing program are relatively slow, usually less than one tenth of the normal cutting speed, to ensure the safety of the feed and retract. Therefore, when processing an integral tank bottom containing a large number of closed areas, the feed and retract time occupies a large part of the total processing time, which seriously affects the processing efficiency.

[0006] In summary, for the mirror milling processing of a super-multiple closed grid integral tank bottom, a new processing method is urgently needed to greatly compress the number of programs, reduce the feed and retract time, and improve the processing efficiency. SUMMARY

[0007] Aiming at the defects in the prior art, the present application aims to provide an efficient mirror milling method for a super-multiple closed grid integral box bottom.

[0008] According to the present application, an efficient mirror milling method for a super-multiple closed grid integral box bottom is provided, which comprises the following steps:

[0009] An initial tool moving step: the milling side and the measuring side are moved to a safe position respectively, and the milling side is moved to a feed position;

[0010] An initial feed step: after the measuring side compensation function is turned on, the feed is performed to an initial cutting point position of an inner surface, then the milling side compensation function is turned on, and the milling side is fed to the cutting point position along a bevel line and a straight line;

[0011] A cutting step: the region is processed by using a mirror milling motion;

[0012] An inter-region tool lifting step: after the milling side compensation function is turned off, the milling side is lifted axially to a set height;

[0013] An inter-region tool moving step: the measuring side is moved to an initial milling point of a next closed region along the inner surface with the compensation function, and the milling side is moved to a feed point of the next region according to the set tool lifting height without the compensation function;

[0014] An inter-region feed step: after the milling side compensation function is turned on, the milling side is fed to the cutting point, and then the cutting motion is performed, if there are multiple closed regions, the cutting step and the inter-region feed step are repeated;

[0015] A final tool retracting step: after the last region is processed, the milling side compensation function is turned off, the milling side is lifted axially to a set height, the measuring side compensation function is turned off, and the measuring side is retracted axially to a safe height;

[0016] A final tool moving step: the milling side is lifted to a safe height, the measuring side is moved to an initial position, and then the milling side is moved to the initial position, and the processing is completed.

[0017] Preferably, in the initial tool moving step, the milling side and the measuring side are moved from the initial positions defined by the equipment to the safe positions of the first region respectively, and then the milling side is moved to the feed position of the first region.

[0018] Preferably, in the initial feeding step, firstly, the measurement side compensation function is turned on, the feeding speed is less than 100 mm / min, the measurement side is slowly fed from the safe position of the first region to the measurement position of the first region, the measurement side compensation function keeps the measurement side at a fixed distance from the inner surface; after obtaining the stable measurement wall thickness data, the milling side compensation function is turned on, the milling side is slowly fed from the feeding position of the first region to the initial cutting position of the first region, the feeding speed is less than 100 mm / min, and the milling side compensation algorithm monitors the wall thickness in real time until the wall thickness reaches the set value.

[0019] Preferably, in the cutting processing step, the milling side and the measurement side are driven by the mirror milling processing track according to the set wall thickness compensation algorithm, and the milling of the first region is completed synchronously, and the milling speed is not less than 5000 mm / min.

[0020] Preferably, in the region-to-region lifting step, after the milling side compensation function is turned off, the milling side is lifted axially to the set height of the first region at a lifting speed of 5000 mm / min.

[0021] Preferably, in the region-to-region moving step, the measurement side moves to the initial measurement point of the second region along the inner surface at a cutting speed with the compensation function; and the milling side moves to the feeding point of the second region at a set lifting height at a cutting speed in the mode of turning off the compensation function.

[0022] Preferably, in the region-to-region feeding step, after the milling side compensation function is turned on, the milling side is fed from the feeding point of the second region to the initial cutting point of the second region at a feeding speed of less than 100 mm / min, and then cutting movement is performed.

[0023] Preferably, in the final lifting step, after the last region is processed, the milling side compensation function is turned off, the milling side is lifted axially to the set height at a lifting speed of the cutting speed; and then the measurement side compensation function is turned off, the measurement side is lifted normally to the safe height at a lifting speed of the cutting speed.

[0024] Preferably, in the final moving step, the milling side is lifted to the safe height at a fast moving speed, and then the milling side moves to the initial position at the fast moving speed after the measurement side moves to the initial position, and the processing is completed.

[0025] Preferably, the whole box bottom is the whole box bottom of a launch vehicle fuel tank, the inner surface of which is smooth and has no features, and the outer surface has a closed cavity.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] 1、The present application significantly reduces the number of programs required for mirror milling of the overall box bottom of the super-multiple closed grid by merging the processing programs of multiple closed areas into one processing program; not only simplifies the processing flow, but also improves the processing efficiency, reduces the complexity of program management and execution;

[0028] 2、The present application cancels the measuring side in and out of the tool action between the closed areas, and reduces the in and out of the tool height of the milling side, realizes the safe and efficient transition between the areas; effectively reduces the additional processing time caused by the in and out of the tool action, further improves the overall processing efficiency;

[0029] 3、The super-multiple closed grid overall box bottom efficient mirror milling method provided by the present application provides a solid process foundation for the optimization of the subsequent overall box bottom structure; through the realization of efficient and accurate processing, it provides strong support for the manufacturing of key components such as launch vehicle fuel tank, and helps to promote the continuous development and progress of aerospace technology. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent through reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 The flow chart of the super-multiple closed grid overall box bottom efficient mirror milling method of the present application;

[0032] Figure 2 The structure diagram of the super-multiple closed grid overall box bottom of the present application;

[0033] Figure 3 The position diagram of the milling side and the compensation side of the super-multiple closed grid overall box bottom efficient mirror milling of the present application.

[0034] Among them:

[0035] Overall box bottom section 1; Overall box bottom inner profile 2; Overall box bottom thickening area 3; Overall box bottom first thinning area 4; Overall box bottom second thinning area 5; Mirror milling equipment measurement side 6; Measurement side initial position 7; Mirror milling equipment milling side 8; Milling side initial position 9; Measurement side safety position 10; First region measurement side start position 11; Milling side safety position 12; Milling side feed position 13; First region milling side cutting position 14; First region measurement side end position 15; First region milling side cutting end position 16; First region milling side set lifting position 17; Second region measurement side start position 18; Second region milling side set lifting position 19; Second region milling side feed position 20; Second region milling side cutting position 21; Second region measurement side end position 22; Second region cutting side end position 23; Second region cutting side end set lifting position 24; Processing end measurement side safety position 25; Processing end milling side safety position 26. DETAILED DESCRIPTION

[0036] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the application. These are within the scope of protection of the application.

[0037] Example 1

[0038] According to the super multi-closed grid overall box bottom efficient mirror milling processing method provided by the application, the method comprises the following steps:

[0039] Initial tool moving step: the milling side and the measurement side are moved to the safety positions respectively, and the milling side is moved to the feed position;

[0040] Initial feed step: after the measurement side compensation function is turned on, the feed is to the initial cutting point position of the inner profile, and then the milling side compensation function is turned on, and the milling side is fed to the cutting point position along the inclined line and the straight line;

[0041] Cutting processing step: the region processing is completed by using the mirror milling motion;

[0042] Inter-region tool lifting step: after the milling side compensation function is turned off, the milling side is lifted along the axial direction to the set height;

[0043] Inter-region tool moving step: the measurement side is moved to the initial milling point of the next closed region along the inner profile with the compensation function, and the milling side is moved to the feed point of the next region according to the set tool lifting height without compensation;

[0044] Inter-region tool retracting step: after turning on the milling side compensation function, the milling side is retracted to the set height of the first region, and then the measuring side compensation function is turned off and the measuring side is retracted to the safety height.

[0045] Final tool retracting step: after the last region is processed, the milling side compensation function is turned off and the milling side is retracted to the set height, and then the measuring side compensation function is turned off and the measuring side is retracted to the safety height.

[0046] Final tool moving step: after the milling side is retracted to the safety height and the measuring side moves to the initial position, the milling side moves to the initial position, and the processing is completed.

[0047] In the initial tool moving step, the milling side and the measuring side are moved from the initial position defined by the equipment to the safety position of the first region, and then the milling side is moved to the tool feeding position of the first region.

[0048] In the initial tool feeding step, first, the measuring side compensation function is turned on, the tool feeding speed is less than 100 mm / min, and the measuring side is slowly fed from the safety position of the first region to the measuring position of the first region. The measuring side compensation function keeps the measuring side at a fixed distance from the inner surface. After obtaining stable measurement wall thickness data, the milling side compensation function is turned on, the milling side is slowly fed from the tool feeding position of the first region to the initial cutting position of the first region, the tool feeding speed is less than 100 mm / min, and the milling side compensation algorithm monitors the wall thickness in real time until the wall thickness reaches the set value.

[0049] In the cutting processing step, the milling side and the measuring side are driven by the mirror milling processing trajectory according to the set wall thickness compensation algorithm, and the milling of the first region is completed synchronously. The milling speed is not less than 5000 mm / min.

[0050] In the region tool retracting step, first, the milling side compensation function is turned off, and then the milling side is retracted to the set height of the first region along the axial direction at a retracting speed of 5000 mm / min.

[0051] In the region tool moving step, the measuring side moves to the initial measuring point of the second region along the inner surface at the cutting speed with the compensation function. During the moving process, the compensation function controls the fixed distance from the inner surface. The milling side moves to the tool feeding point of the second region at the cutting speed according to the set retracting height in the mode of turning off the compensation function.

[0052] In the region tool feeding step, the milling side compensation function is turned on, and then the milling side is fed from the tool feeding point of the second region to the initial cutting point of the second region at a tool feeding speed of less than 100 mm / min. After the tool feeding movement is completed, the cutting movement is performed.

[0053] In the final tool removal step, after the last region is machined, the milling side compensation function is first turned off, the milling side is axially removed to the set height, and the removal speed uses the cutting speed; then the measurement side compensation function is turned off, the measurement side is removed to the safety height, and the removal speed uses the cutting speed.

[0054] In the final tool removal step, after the last region is machined, the milling side compensation function is first turned off, the milling side is axially removed to the set height, and the removal speed uses the cutting speed; then the measurement side compensation function is turned off, the measurement side is removed to the safety height, and the removal speed uses the cutting speed.

[0055] The overall box bottom is a whole box bottom of a launch vehicle fuel storage tank with a closed cavity on the outer profile surface and no characteristics on the inner profile surface.

[0056] Example 2

[0057] The present application provides a kind of super multiple closed grid whole box bottom efficient mirror image milling processing method, it is characterized in that, when the multiple closed regions of whole box bottom are successively machined, including the following steps: step 1, initial tool removal: milling side and measurement side are moved to safety position respectively, and milling side is quickly moved to the feed position;Step 2, initial feed: after opening the measurement side compensation function, feed to the initial cutting point position of inner profile surface, then open the milling side compensation function, and milling side is fed to the cutting point position by inclined line and straight line;Step 3, cutting processing: complete the mirror image milling processing of the region;Step 4, region lifting tool: after closing the milling side compensation function, milling side is axially lifted to the set height;Step 5, region tool removal: measurement side moves to the initial milling point of next closed region along the inner profile surface with compensation function, and milling side moves to the feed point of next region according to the set lifting height without compensation;Step 6, region feed: after opening the milling side compensation function, milling side is fed to the cutting point, and then cutting movement is carried out, if there are multiple closed regions, steps 3 to 6 are repeated;Step 7, final tool removal: after the last region is machined, the milling side compensation function is closed, the milling side is axially lifted to the set height, and then the measurement side compensation function is closed, and the measurement side is axially removed to the safety height;Step 8, final tool removal: milling side is lifted to the safety height, and after measurement side moves to the initial position, milling side moves to the initial position, and the machining is completed.The super multiple closed grid whole box bottom efficient mirror image milling processing method of the present application greatly reduces the feed and removal movement of the measurement side and reduces the feed and removal movement distance of the milling side by reasonably controlling the movement of the milling side and the measurement side in different stages, and greatly improves the mirror image milling processing efficiency of the super multiple closed grid whole box bottom.

[0058] The present application provides a kind of super multiple closed grid whole box bottom efficient mirror image milling processing method, including the following steps:

[0059] Step 1, initial tool moving: the milling side and the measuring side move to the safe position respectively, and the milling side moves to the feed position quickly;

[0060] Step 2, initial tool feeding: after the measuring side compensation function is turned on, the tool is fed to the initial cutting point position of the inner surface, and then the milling side compensation function is turned on, and the milling side is fed to the cutting point position along the inclined line and the straight line;

[0061] Step 3, cutting processing: the mirror milling motion is used to complete the processing of the region;

[0062] Step 4, tool lifting between regions: after the milling side compensation function is turned off, the milling side is lifted axially to the set height;

[0063] Step 5, tool moving between regions: the measuring side moves to the initial milling point of the next closed region along the inner surface with the compensation function, and the milling side moves to the feed point of the next region according to the set lifting height without compensation;

[0064] Step 6, tool feeding between regions: after the milling side compensation function is turned on, the milling side is fed to the cutting point, and then the cutting motion is performed, if there are multiple closed regions, steps 3 to 6 are repeated;

[0065] Step 7, final tool retracting: after the last region is processed, the milling side compensation function is turned off, the milling side is lifted axially to the set height, and then the measuring side compensation function is turned off, and the measuring side is retracted axially to the safe height;

[0066] Step 8, final tool moving: the milling side is lifted to the safe height, the measuring side moves to the initial position, and then the milling side moves to the initial position, and the processing is completed.

[0067] The overall box bottom is an inner surface smoothing without features, and the outer surface has a large number of closed cavities, which is a whole box bottom of a launch vehicle fuel tank, and the processing track is a path containing multiple (not less than 2) closed regions.

[0068] In step 1, the milling side and the measuring side move from the initial position defined by the equipment to the safe position of the first region, and then the milling side moves to the feed position of the first region quickly.

[0069] In step 2, first open the measurement side compensation function, the feed speed is less than 100 mm / min, the measurement side slowly feeds from the safe position of the first region to the measurement position of the first region, the measurement side compensation function keeps the measurement side at a fixed distance from the inner surface, avoiding too large distance leading to unstable measurement of wall thickness, or too small distance causing collision between the measurement side and the inner surface; after obtaining stable measurement of wall thickness data, open the milling side compensation function, the milling side slowly feeds from the feed position of the first region to the initial cutting position of the first region, the feed speed is less than 100 mm / min, and the milling side compensation algorithm monitors the wall thickness in real time until the wall thickness reaches the set value.

[0070] In step 3, according to the set wall thickness compensation algorithm, the milling side and the measurement side are driven by the mirror milling processing track to synchronously complete the milling processing of the first region, and the milling speed is generally not less than 5000 mm / min.

[0071] In step 4, after the milling side compensation function is closed, the milling side is raised axially to the set height of the first region, and the raising speed is generally 5000 mm / min.

[0072] In step 5, the measurement side moves to the initial measurement point of the second region along the inner surface at the cutting speed with the compensation function, and the compensation function controls the fixed distance from the inner surface during the movement; the milling side moves to the feed point of the second region at the cutting speed according to the set raising height in the mode of closing the compensation function.

[0073] In step 6, after the milling side compensation function is opened, the milling side feeds from the feed point of the second region to the initial cutting point of the second region, and the feed speed is less than 100 mm / min, and after the feed movement is completed, the cutting movement is performed. If there are multiple closed regions, steps 3 to 6 are repeated until all the regions complete the cutting processing.

[0074] In step 7, after the last region is processed, the milling side compensation function is closed first, the milling side is axially retreated to the set height at the cutting speed, and then the measurement side compensation function is closed, the measurement side is retreated to the safe height at the cutting speed.

[0075] In step 8, the milling side is raised to the safe height at the fast moving speed, the measurement side is moved to the initial position, and then the milling side is moved to the initial position at the fast moving speed, and the processing is completed.

[0076] The application greatly reduces the number of programs of the whole box bottom mirror milling processing of the super-multiple closed areas by combining multiple closed area processing programs into one processing program; the processing time is reduced due to the retracting of the measuring side between the closed areas and the retracting height of the milling side; the super-multiple closed area whole box bottom efficient mirror milling processing method can realize efficient mirror milling processing of the super-multiple closed area whole box bottom, and provides a process basis for subsequent whole box bottom structure optimization.

[0077] Figure 1 The flowchart of the super-multiple closed grid whole box bottom efficient mirror milling processing method of the application. Figure 2 The super-multiple closed grid whole box bottom is the main application object of the application, and the inside surface is smooth without features, and the outside surface has many closed features. Figure 3 The milling side and the compensation side position diagram of the super-multiple closed grid whole box bottom efficient mirror milling processing of the application.

[0078] The local diagram of the super-multiple closed grid whole box bottom 1 is shown in Figure 3 The inside surface 2 is smooth without features, the whole box bottom thickening area 3 has super-multiple closed areas, the first thinning area 4 of the whole box bottom, and the second thinning area 5 of the whole box bottom.

[0079] The super-multiple closed grid whole box bottom efficient mirror milling processing method provided by the application, as shown in Figure 1 includes the following steps:

[0080] Step 1, initial retracting: the measuring side 6 and the milling side 7 of the mirror milling equipment are respectively located at the milling side 8 and the initial position 9 of the milling side of the mirror milling equipment defined by the equipment; when the initial retracting is performed, the measuring side is quickly moved to the safe position 10 of the measuring side, the milling side is quickly moved to the first region measuring side starting position 11, and then the milling side is quickly moved to the first region milling side feeding position 12.

[0081] Step 2, initial feeding: after the measuring side compensation function is started, the measuring side is slowly fed (≤100 mm / min) to the milling side feeding position 13, the milling side compensation function is started, and the milling side is fed to the first region milling side cutting position 14;

[0082] Step 3, cutting processing: the first region is processed by using the mirror milling motion; at this time, the measuring side is moved to the first region measuring end position 15 according to the trajectory, and the milling side is synchronously moved to the first region milling end position 16 according to the trajectory;

[0083] Step 4, region lifting: after the milling side compensation function is closed, the milling side is lifted along the axial direction to a set height, and reaches the first region milling side set lifting position 17.

[0084] Step 5, inter-regional tool lifting: the measurement side moves to the second region measurement side starting position 18 along the inner profile surface with compensation, and the milling side moves to the second region milling side set lifting position 19 without compensation;

[0085] Step 6, inter-regional tool feeding: after the milling side compensation function is turned on, the milling side feeds to the second region milling side feeding position 20, and then feeds slowly to the second region milling side cutting position 21, and then performs cutting movement; after the second region is processed, the measurement side reaches the second region measurement side end position 22, and the milling side reaches the second region cutting side end position 23;

[0086] Step 7, final tool retracting: after the second region is processed, the milling side compensation function is turned off, the milling side is axially lifted to the second region cutting side end set lifting position 24, and then the measurement side compensation function is turned off, and the measurement side is axially retracted to the processing end measurement side safe position 25;

[0087] Step 8, final tool moving: the milling side is lifted to the processing end milling side safe position 26, and then the measurement side moves to the initial position; the milling side moves to the initial position, and the processing is completed.

[0088] The super-multiple closed grid whole box bottom efficient mirror milling processing method of the application can greatly reduce the number of super-multiple closed region whole box bottom mirror milling processing programs by combining multiple closed region processing programs into one processing; by canceling the measurement side feeding and retracting between the closed regions and reducing the feeding and retracting height of the milling side, safe transition between the regions is realized, efficient mirror milling processing of the super-multiple closed region whole box bottom is realized, and a process basis is provided for subsequent whole box bottom structure optimization.

[0089] Those skilled in the art can understand the present embodiment as a more specific description of embodiment 1.

[0090] Those skilled in the art know that in addition to implementing the system and each device, module and unit thereof provided by the application in a pure computer readable program code manner, the same functions can also be realized by logically programming the method steps in the form of logic gates, switches, special integrated circuits, programmable logic controllers and embedded microcontrollers, etc. Therefore, the system and each device, module and unit thereof provided by the application can be considered as a hardware component, and the devices, modules and units included therein for realizing various functions can also be considered as structures within the hardware component; the devices, modules and units for realizing various functions can also be considered as both software modules realizing methods and structures within the hardware component.

[0091] The specific embodiments of the present application have been described. It is to be understood that the application is not limited to particular details described herein and that various modifications can be made therein without departing from the scope of the claimed application. Embodiments and features disclosed in this document, including in the examples, can be combined with each other, unless specifically contradicted by or inconsistent with each other.

Claims

1. A method for efficient mirror milling of a single box bottom with multiple closed grids, characterized in that, The method includes the following steps: Initial tool repositioning steps: Move the milling side and the measuring side to the safe position respectively, and move the milling side to the tool infeed position; Initial feed steps: After enabling the measurement side compensation function, feed the tool to the initial cutting point position of the inner surface, then enable the milling side compensation function, and feed the tool to the cutting point position using both oblique and straight lines on the milling side. Machining steps: Use mirror milling motion to complete the area machining; Inter-region tool lifting procedure: After disabling the milling side compensation function, lift the milling side tool along the axial direction to the set height; Inter-regional tool shifting steps: With compensation function, the measuring side moves along the inner surface to the initial milling point of the next closed region. With no compensation function, the milling side moves to the entry point of the next region according to the set tool lifting height. Inter-region infeed step: After the milling side compensation function is enabled, the milling side feeds to the cutting point and then performs the cutting motion. If there are multiple closed regions, the cutting process is repeated until the inter-region infeed step is performed. Final retraction steps: After machining the last area, turn off the milling side compensation function, raise the milling side axial tool to the set height, then turn off the measurement side compensation function, and retract the measurement side axial tool to the safe height. Final tool repositioning steps: Raise the milling side tool to a safe height, move the measuring side to the initial position, and then move the milling side to the initial position. This completes the machining process.

2. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the initial tool movement step, after the milling side and the measuring side move from the initial position defined by the equipment to the safe position of the first area, the milling side moves alone to the infeed position of the first area.

3. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the initial feed step, the measurement side compensation function is first activated, the feed speed is less than 100mm / min, and the measurement side slowly feeds from the safe position of the first area to the measurement position of the first area. The measurement side compensation function keeps the measurement side at a fixed distance from the inner surface. After obtaining stable wall thickness data, the milling side compensation function is activated. The milling side slowly feeds from the infeed position of the first region to the initial cutting position of the first region, with a feed speed of less than 100 mm / min. During the process, the milling side compensation algorithm monitors the wall thickness in real time until the wall thickness reaches the set value.

4. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the cutting process, according to the set wall thickness compensation algorithm, the milling side and the measuring side are driven by the mirror milling machining trajectory to complete the milling machining of the first area synchronously, and the milling speed is not less than 5000 mm / min.

5. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the inter-regional tool lifting step, after first turning off the milling side compensation function, the milling side is lifted axially to the set height of the first region, and the lifting speed is 5000mm / min.

6. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the inter-regional tool shifting step, the measuring side, with the compensation function enabled, moves along the inner surface at the cutting speed to the initial measuring point of the second region. During the movement, the compensation function controls the distance between the measuring side and the inner surface to remain fixed. The milling side, with the compensation function disabled, moves at the cutting speed according to the set tool lifting height to the entry point of the second region.

7. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the inter-regional feed step, after the milling side compensation function is enabled, the milling side feeds from the feed point of the second region to the initial cutting point of the second region. The feed speed is less than 100 mm / min. After the feed motion is completed, the cutting motion is then performed.

8. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the final retraction step, after machining the last area, first turn off the milling side compensation function, retract the milling side axially to the set height, and use the cutting speed for the retraction; then turn off the measurement side compensation function, retract the measurement side normal to the safe height, and use the cutting speed for the retraction.

9. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, In the final tool retraction step, the milling side uses rapid traverse speed to lift the tool to a safe height. After the measuring side moves to the initial position, the milling side uses rapid traverse speed to move to the initial position, thus completing the machining process.

10. The method for efficient mirror milling of a large number of closed grid integral box bottoms according to claim 1, characterized in that, The integral tank bottom is a rocket fuel tank integral tank bottom with a smooth inner surface and no features, and a closed cavity on the outer surface. The processing trajectory is a path containing multiple closed areas.

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