CN116689843B - Device and method for precisely milling process allowance of complex grid reinforcement member - Google Patents

Abstract

The invention discloses a device and a method for precisely milling process allowance of a complex grid reinforced component. The device mills and designs the backup pad in frock cardboard top and in frock both sides to set up adjustable bolt in the backup pad, make the rigidity big deflection less in the middle of the component, also can not interfere with cardboard top in the middle of the component, and when there is the clearance between component and the backup pad, prevent cutting process vibration. In the clamping process, in order to prevent the components from being severely deformed or inclining to one side, a component symmetrical clamping method is adopted, and the clamping deformation degree is controlled by using a dial indicator. According to the invention, through design and process consideration, the chord length measured after cutting on the component machine tool is consistent with the chord length in a free state, and the phenomenon of cutting deformation rebound does not occur, so that the subsequent assembly process is facilitated.

Description

Device and method for precise milling of process allowances for complex grid-reinforced components

Technical field

The invention relates to the technical field of metal reinforced component processing, and specifically relates to a device and method for precise milling of complex grid reinforced components with process margins.

Background technique

Aluminum alloy mesh reinforced components are widely used in high-end aerospace equipment such as launch vehicle tank wall panels and aircraft wings. They have the advantages of strong load-bearing capacity and high overall rigidity. Therefore, the accuracy of their final dimensions is critical to the safety of aerospace equipment. performance and reliability are of great significance. During the forming process of metal components, there is usually a certain process margin left for clamping, positioning, etc., which is removed after the forming is completed. After forming, for general components, wire saws, electric saws, etc. can be used to manually remove the process allowance; however, for large and complex ribbed components, especially those with high grid ribs, the above manual method cannot be used to remove the process allowance or the accuracy after cutting is not good. High, assembly cannot be performed.

To this end, the present invention proposes a method and cutting tool for cutting the process allowance of grid high-reinforced wall panels to achieve accurate cutting of the process allowance of large-scale grid high-reinforced wall panels, thereby improving the safety and reliability of the equipment.

Contents of the invention

The purpose of the present invention is to provide a device for precise milling of process allowances of complex grid-reinforced components, to achieve accurate cutting of process allowances for large-scale grid high-reinforced wall panels, thereby improving the safety and reliability of the equipment.

In order to achieve the above object, the present invention provides a device for precise milling of complex grid reinforcement components, including a frame structure, a positioning structure, a support structure and a clamping structure; the frame structure includes a base plate, where Several transverse clamping plates and several longitudinal clamping plates are arranged parallel to each other in the transverse and longitudinal directions on the base plate. The top surface of the frame structure is an arc that matches the arc shape of the complex grid reinforcement member to be processed. The positioning structure includes a circumferential positioning adjustment mechanism located on both sides of the frame structure, an axial positioning adjustment mechanism located at one longitudinal end of the frame structure, and a positioning plate located at the other longitudinal end of the frame structure. ; The support structure includes support plates arranged around the top of the frame structure and a downwardly concave interference avoidance platform arranged at the center of the arc-shaped support surface. Two support plates are located on both sides of the frame structure. A number of adjustable bolts are provided on each frame; the clamping structure includes a number of clamping assemblies respectively arranged on both sides of the frame structure, and a number of the clamping assemblies and a number of the adjustable bolts are disposed in an offset manner. .

Further, the bottom plate, the transverse clamping plate and the longitudinal clamping plate are all provided with a number of weight-reducing holes, and the holes provided on the bottom plate avoid the transverse clamping plate and the longitudinal clamping plate. .

Further, first support plates are provided at both longitudinal ends of the frame structure, and second support plates are provided at parallel intervals on the inside of the first support plate close to one end of the axial positioning adjustment mechanism, and the second support plates are arranged in parallel with each other. Two third support plates are connected between the first support plate near one end of the positioning plate; both ends of the first support plate, the second support plate and the top two ends of each transverse clamping plate Slots are provided respectively, and the slots are located outside the two third support plates.

Further, each third support plate is provided with 4 to 6 adjustable bolts at intervals; the width of the support plate is 70 to 100 mm.

Further, the interference avoidance platform is a platform with a depth of 10~20mm cut downward from the center point of the arc-shaped support surface.

The invention also provides a method for precise milling of process allowances of complex grid-reinforced components. The above-mentioned device is used to cut the process allowances of grid-reinforced components. The method includes the following steps:

S1. Component positioning: First, lift the complex grid reinforced component to be processed onto the milling device, use the axial positioning adjustment mechanism to make one end of the length direction of the component fit the positioning plate, and then adjust the circumferential positioning on both sides of the device by adjusting the lateral sides The mechanism makes the components symmetrical about the center;

S2. Component fixation: First, place a metal block between the third support plate and the inner surface of the component, or adjust the adjustable bolts on the third support plate so that the bolts resist the inner surface of the component; then use the device to horizontally The clamping components on both sides fix the component; after the fixation is completed, use a machine tool to measure the top Z coordinates of the center rib on the component and at least two laterally symmetrically set side ribs. If the two laterally symmetrically set side ribs are If the deviation value of the Z coordinate of the top of the side rib is within 0.5mm, it indicates that the component is in good position after clamping and fixing; remove the positioning plate, and use a machine tool to measure the initial flatness of the side of the component;

S3. Rough cutting of components: First, use a machine tool to draw the final cutting line of the component to prevent over-cutting; then rough cut the component, and control the chord length process margin of 5~10mm on each side during rough cutting. In order to prevent the release of residual stress from causing serious deformation of the component; at the same time, in order to ensure that the component still has sufficient stiffness during the cutting process, several process structures are left on both sides of the component; after rough cutting is completed, the clamping component is first removed, and then the component is measured using a machine tool The chord lengths of the two ends in the length direction, and then the component is lifted upright and in a free state, the chord lengths of the upper and lower parts of the component are measured, and compared with the chord lengths of the two ends measured on the machine tool;

S4. Precision cutting of the component: Repeat steps S1 and S2 to position and fix the component rough-cut in step S3 again; use the average chord length method to perform multiple precision cuts on the component so that the process margin on both sides of the component gradually increases. Reduce until the single-sided process margin is 0.2~0.5mm, and finally perform light knife processing to reduce the surface roughness of the part;

S5. Lower part milling: After the lateral sides of the component are precision cut, the lower end surface of the component is milled flat;

S6. Accuracy testing: Manually remove the remaining process structures on both sides of the component, use an ultrasonic thickness gauge to measure the thickness of the lower end surface of the component, and then lift the component vertically to scan the inner surface to measure the accuracy.

Further, in step S1, after the positioning is completed, a machine tool is used to measure the coordinates of the center rib of the component along the axial direction to see whether it is on a straight line. Otherwise, a circumferential positioning adjustment mechanism is used to slightly adjust the component until it meets the requirements. Require.

Further, in step S2, in order to prevent the component from tilting to one side during the clamping and fixing process, the symmetrical positions on both sides of the component are clamped simultaneously, and when clamping and fixing, a dial indicator is placed at the clamping position. And control the deformation of the dial indicator within 0.5mm.

Further, in step S4, during the first precision cutting, a process margin of 0.8~1.5mm is reserved on each side of the component. After cutting, the chord lengths of the upper and lower parts of the component are measured on the machine tool; thereafter, each time The component is precisely cut with a process allowance of 0.6~1mm on both sides of the transverse direction until the process allowance on one side is 0.2~0.5mm.

Furthermore, the deviation value of the upper and lower chord lengths of the component after each cutting is d; after completion of fine cutting, the chord length of the upper part of the component is the sum of the final target chord length plus half of the deviation value d, and the chord length of the lower part of the component is The final target chord length minus half the deviation value d.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The device of the present invention for precise milling of complex grid-reinforced components with process margins includes three positioning structures: a positioning plate, a circumferential and axial positioning adjustment mechanism, and is combined with machine tool coordinate position measurement, thereby achieving Precise positioning of components. At the same time, due to the large difference in overall and local stiffness, high-reinforced components are prone to slight over-bending or under-bending after forming. In the present invention, the top of the clamping plate of the device is milled flat. When the middle stiffness of this component is large and the deformation is small, the middle of the component will not Will interfere with the top of the clamping plate; a third support plate is provided on both sides of the device. Bolt holes are provided on the third support plate, and an adjustment bolt is provided in each bolt hole. When the component is between the component and the third support plate When there is a gap, in order to prevent vibration during the cutting process, the bolts can be adjusted so that the top of the bolts press against the component, or a metal block can be placed between the third support plate and the component. During the clamping process, in order to prevent the component from being severely deformed during clamping or tilting to one side, the component is clamped symmetrically and simultaneously, and a dial indicator is used to control the degree of clamping deformation. In order to ensure sufficient rigidity during the cutting process, the complete cutting is not performed, and a certain margin of process structure is left, which will be manually removed later. In order to facilitate the assembly of subsequent components and other parts, the components were cut using the average method of the upper and lower chord lengths, so that the errors are evenly dispersed and will not be concentrated in one place; at the same time, the chord lengths at different positions of the components after cutting on the machine tool were compared. The chord lengths at different positions compared with the vertical state have good consistency. Through the above settings, the device of the present invention makes the chord length measured after the component is cut on the machine tool consistent with the chord length in the free state, and the cutting deformation and rebound phenomenon will not occur, thereby facilitating the subsequent assembly process.

(2) The device of the present invention for precise milling of complex grid-reinforced components with process margins is provided with a knife-off position so that the machine tool tool will not damage the tooling during the cutting process; at the same time, the milling device of the present invention is also provided with different axes The structure is compatible with length-oriented components and is suitable for cutting components of different lengths.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.

Description of drawings

The drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the description. Together with the following specific implementation modes, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the attached picture:

Figure 1 is a schematic diagram of the overall structure of a device for precise milling of complex grid reinforcement components according to the present invention;

Figure 2 is a schematic diagram of the overall structure of the cooperation between the wall panel and the device in the present invention;

Figure 3 is a schematic diagram of the wall panel fixing structure of the present invention, in which (a) is an enlarged structural schematic diagram of M in Figure 2, (b) is a transverse cross-sectional structural schematic diagram of M in Figure 2;

Figure 4 is a schematic diagram of cutting both sides (only part is shown) of the wall panel in the present invention;

Among them, 1-base plate, 2-transverse clamping plate, 3-vertical clamping plate, 4-circumferential positioning adjustment mechanism, 5-axial positioning adjustment mechanism, 6-positioning plate, 7-support plate, 7.1-first support plate , 7.2-Second support plate, 7.3 Third support plate, 7a-Tool slot, 8-Interference avoidance platform, 9-Adjustable bolts, 10-Clamping component, 11-Process structure, A-Complex grid reinforcement Member, A1-center rib, A2-side rib.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

Please refer to Figures 1 to 4. This embodiment is a device for precise milling of complex grid reinforcement components, including a frame structure, a positioning structure, a support structure and a clamping structure; the specific structure is as follows:

The frame structure includes a base plate 1, several transverse clamping plates 2 and several longitudinal clamping plates 3. The several transverse clamping plates 2 and several longitudinal clamping plates 3 are respectively arranged parallel to each other on the base plate 1 along the transverse and longitudinal directions. The base plate 1, Both the transverse clamping plate 2 and the longitudinal clamping plate 3 are provided with grid plates with several weight-reducing holes, and the holes on the bottom plate avoid the transverse clamping plate 2 and the longitudinal clamping plate 3. The transverse clamping plate and the longitudinal clamping plate with holes are Card board welding connection. The top surface of the frame structure is an arc-shaped support surface that matches the arc shape of the complex grid reinforced component A to be processed. The positioning structure includes a plurality of circumferential positioning adjustment mechanisms 4 respectively located on both sides of the frame structure, a plurality of axial positioning adjustment mechanisms 5 located at one longitudinal end of the frame structure, and a plurality of positioning plates 6 located at the other longitudinal end of the frame structure. Specifically, two circumferential positioning adjustment mechanisms 4 are provided on each transverse side of the frame structure, an axial positioning adjustment mechanism 5 is provided at one longitudinal end of the frame structure, and three positioning plates 6 are provided at the other longitudinal end of the frame structure. The support structure includes support plates 7 arranged around the top of the frame structure and a downwardly concave interference avoidance platform 8 arranged at the center of the arc-shaped support surface (the top of the symmetrical center of the device). Two support plates are located on both sides of the frame structure. 7 are provided with several adjustable bolts 9. The support plate 7 includes a first support plate 7.1, a second support plate 7.2 and a third support plate 7.3. The first support plate 7.1 is respectively provided at both longitudinal ends of the frame structure. The first support plate 7.1 is close to one end of the axial positioning adjustment mechanism 5. There are second support plates 7.2 arranged at parallel intervals on the inside of the second support plate 7.2, and two third support plates 7.3 are longitudinally connected between the second support plate 7.2 and the first support plate 7.1 near one end of the positioning plate 6. In order to prevent the machine tool tool from damaging the tooling during the cutting process, the two first support plates 7.1 and the second support plate are provided with tool grooves 7a at both ends, and the top two ends of each transverse clamping plate are respectively provided with tool grooves 7a , and these grooves are located outside the two third support plates 7.3. The clamping structure includes a plurality of clamping assemblies 10 respectively arranged on both sides of the frame structure in the transverse direction. The plurality of clamping assemblies 10 are disposed in a staggered position with a plurality of adjustable bolts 9 .

In a specific implementation, each third support plate 7.3 is provided with 4 to 6 adjustable bolts 9 at intervals; the width of all support plates is 70 to 100 mm. There are 5 to 8 clamping components 10 on each side of the frame structure, and the clamping components on both sides are arranged symmetrically. The interference avoidance platform 8 is a platform cut to a depth of 10 to 20 mm from the center point of the arc-shaped support surface on the top surface of the frame structure.

A method for precise milling of process allowance of complex grid-reinforced components according to the embodiment of the present invention uses the above-mentioned device to cut the process allowance of the grid-reinforced component. In this embodiment, grid-reinforced component A Specifically siding; the method includes the following steps:

S1. Wall panel positioning: First, lift the wall panel to be processed onto the milling device, use the axial positioning adjustment mechanism 5 to make one end of the wall panel in the length direction fit the positioning plate 6, and then adjust the circumferential positioning adjustment mechanisms on both sides of the lateral side. 4. Make the center of the plate symmetrical; after the positioning is completed, use a machine tool to measure the coordinates of the center rib of the wall plate along the axial direction to see if it is on a straight line. Otherwise, use the circumferential positioning adjustment mechanism 4 to slightly adjust the wall plate until it meets the requirements. requirements, as shown in Figure 2.

S2. Wall panel fixing: After actual forming, the inner surfaces on both sides of the wall panel have no contact with the surface of the tooling pallet. In order to prevent the wall panel from vibrating during processing, first fix the inner surface between the third support plate 7.3 and the wall panel. Pad a metal block, or adjust the adjustable bolts 9 on the third support plate 7.3 so that the bolts resist the inner surface of the wall panel; then use the clamping components 10 on both sides of the device to fix the wall panel; in order to prevent the clamping and fixing process The middle wall plate is tilted to one side, and both sides of the wall plate are clamped at symmetrical positions at the same time. When the clamping is fixed, place a dial indicator at the clamping position to control the deformation of the dial indicator within 0.5mm, so that compaction can be achieved It can also prevent the siding from deforming due to pressure. After the fixation is completed, use a machine tool to measure the top Z coordinate of the center rib A1 and at least two laterally symmetrically arranged side ribs A1 on the wall panel. If the top Z coordinate of the two laterally symmetrically arranged side ribs A2 is The deviation value is within 0.5mm, which indicates that the wall panel is in good position after being clamped and fixed. At the same time, remove the positioning plate 6, and use a machine tool to measure the initial flatness of the side of the wall panel; specifically, you can choose the symmetrical settings on both sides of the central rib Any two side ribs, and preferably the two side ribs are located closer to both sides of the wall panel beam.

S3. Rough cutting of wall panels: First, use a machine tool to draw the final cutting line of the wall panels to prevent over-cutting; then rough cut the wall panels. Due to the residual stress release that may occur after the process allowance of the wall panels is cut, the deformation will be severe and the roughness will be severe. When cutting, control to leave a chord length of 5~10mm on each side; in order to ensure that the wall panel still has sufficient stiffness during the cutting process, leave a number of 20~50mm wide and 3~10mm thick on both sides of the wall panel. Process structure 11, as shown in Figures 2 and 4. The cutting sequence of the wall panel is to first cut the high ribs and then cut the skin; after completing the rough cutting, first remove the clamping assembly 10, and then use a machine tool to measure the chord length of both ends of the wall panel in the length direction (that is, the longitudinal direction of the device). Then lift the wall panel to make it upright and in a free state. Use a tape measure to manually measure the chord lengths of the upper and lower parts, and compare them with the two end chord lengths measured on the machine tool. It is found that the two measurement methods The chord lengths are the same, indicating that the wall panels can be measured using a machine tool. The chord length measured in the vertical free state represents the chord length measured in the vertical free state. In this structural arrangement, one end of the wall panel close to the axial positioning adjustment mechanism 5 is provided with a lifting lug, which can easily lift the wall panel. When the wall panel is lifted, the upper end (the end with the lifting lug) ) is called the "upper part", and the lower end (the end opposite to the lifting lug) is called the "lower part". At the same time, in order to facilitate the subsequent description, in steps S4 to S6, the end with the lifting lug will continue to be called the upper part, and the other end opposite to it will be called the lower part. During rough cutting, a cutter is used to intermittently cut the process allowance on both sides of the wall panel, and the uncut part between the two adjacent cutting lines is called a "process structure".

S4. Fine cutting of the wall panel: Repeat steps S1 and S2 to position and fix the rough-cut wall panel. Due to the different stiffness in different areas of the complex mesh reinforced component, there is a slight deviation in the chord length of the upper and lower parts after forming. In order to facilitate subsequent assembly, the average chord length method is used to perform multiple precision cuts on the wall panel, so that the process margin on both sides of the wall panel is gradually reduced until the process margin on one side is 0.2~0.5mm. Finally, light knife processing is performed. Reduce part surface roughness. Among them, during the first precision cutting, the process allowance on both sides of the wall panel is 0.8~1.5mm. After cutting, the chord length of the upper and lower parts of the wall panel is measured on the machine tool; thereafter, the horizontal sides of the wall panel are measured each time. Precisely cut with a process allowance of 0.6~1mm, and measure the chord length of the upper and upper parts of the wall plate until the process allowance on one side is 0.2~0.5mm. After each cutting, the chord length deviation value of the upper and lower parts of the component is d; after finishing the fine cutting, the chord length of the upper part of the component is the sum of the final target chord length plus half of the deviation value d, and the chord length of the lower part of the component is the final target chord. Long minus half of the deviation value d. In a specific implementation, the final target chord length of the component is 2500mm. During rough cutting, there is a chord length margin of 5mm on the left and right sides, and the cutting is started from the lower part to the upper part. After rough cutting, the chord length of the lower part is 2510mm, and the chord length of the upper part is 2510mm. The chord length is 2513mm. The average chord length method is used during fine cutting. If the deviation value d of the upper and lower chord lengths after rough cutting is measured to be 3mm, the final upper chord length required is 2498.5mm and the lower chord length is 2501.5mm. During the first precision cutting, leave a 1mm margin of chord length on each side of the left and right sides and start cutting from the bottom (the 1mm unilateral margin here is relative to the chord length of 2498.5mm), then the chord length after cutting is 2500.5mm. and 2503.5mm, that is, the target chord length in the first precision cutting is 2502mm; in the second precision cutting, leaving 0.3mm chord length on each side of the left and right sides and starting to cut the lower part, then the chord length after cutting is 2499.1mm and 2502.1mm , that is, the target chord length during the second precision cutting is 2500.6mm, and finally the single-sided 0.3mm machine tool fast light knife improves the surface roughness, thereby obtaining 2498.5mm and 2501.5mm, that is, the target chord length during light knife cutting is 2500mm. In the above precision cutting method, the deviation value of the upper and lower chord lengths after each cutting basically remains 3 mm.

During the first precision cutting, the process allowance on both sides of the lateral side is reserved to 1mm; then continue cutting with the process allowance on both sides of the wall panel gradually decreasing until the process allowance on one side is 0.3mm. The deviation value of the chord length of the upper and lower parts of the wall panel before each precision cutting is d. After fine cutting, the chord length of the upper part of the wall panel is the sum of the target chord length corresponding to the final wall panel plus half of the deviation value d. The chord length of the lower part of the wall panel is The chord length is the target chord length corresponding to the final wall panel minus half of the deviation value d; for example, the chord length deviation of the upper and lower parts of the wall panel after rough cutting is 1mm, then the upper chord length after the first cutting is the final wall panel The corresponding target chord length is plus 0.5mm, and the lower chord length is the target chord length corresponding to the final wall panel minus 0.5mm.

S5. Milling of the lower end face: After both sides of the wall panel are precision cut, mill the lower end face. First perform rough milling on the lower end face, and then perform fine milling with a light knife to ensure that the thickness of the end face meets the target requirements. Finally, use a dial indicator to measure the flatness of the lower end face.

S6. Accuracy detection: Manually remove the remaining process structures on both sides of the wall panel, use an ultrasonic thickness gauge to measure the thickness of the lower end surface of the wall panel, and then lift the wall panel vertically to scan the inner surface to measure the accuracy.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A method for accurate milling of process allowances for complex grid-reinforced components, characterized by using a device for accurate milling of process allowances for complex grid-reinforced components. The remaining amount is cut, and the device includes a frame structure, a positioning structure, a support structure and a clamping structure; the frame structure includes a bottom plate (1), on which a number of parallel structures are arranged in the transverse and longitudinal directions. A transverse clamping plate (2) and several longitudinal clamping plates (3), the top surface of the frame structure is an arc-shaped support surface that matches the arc shape of the complex grid reinforcement component (A) to be processed; The positioning structure includes a circumferential positioning adjustment mechanism (4) located on both transverse sides of the frame structure, an axial positioning adjustment mechanism (5) located at one longitudinal end of the frame structure, and an axial positioning adjustment mechanism (5) located at the other longitudinal end of the frame structure. Positioning plate (6); the support structure includes a support plate (7) arranged around the top of the frame structure and a downwardly recessed interference avoidance platform (8) arranged at the center of the arc-shaped support surface. A number of adjustable bolts (9) are provided on the two support plates (7) on both sides of the frame structure; the clamping structure includes a number of clamping assemblies (7) respectively arranged on both sides of the frame structure. 10), a plurality of the clamping components (10) and a plurality of the adjustable bolts (9) are disposed in offset positions; first support plates (7.1) are respectively provided at both longitudinal ends of the frame structure, close to the shaft. A second support plate (7.2) is provided at parallel intervals inside the first support plate at one end of the positioning adjustment mechanism (5). Two support plates are connected between the second support plate and the first support plate close to one end of the positioning plate. Third support plate (7.3); two ends of the two first support plates, two ends of the second support plate, and two ends of the top of each transverse clamping plate are respectively provided with slots (7a) , and the slot (7a) is located outside the two third support plates; the method includes the following steps: S1. Component positioning: First, lift the complex grid reinforced component (A) to be processed to the milling device, and use the axial positioning adjustment mechanism (5) to make one end of the component lengthwise fit the positioning plate (6), and then adjust the The circumferential positioning adjustment mechanisms (4) on both sides of the device make the components centrally symmetrical; S2. Component fixation: First, place a metal block between the third support plate (7.3) and the inner surface of the component, or adjust the adjustable bolts (9) on the third support plate (7.3) so that the bolts resist the component. The inner profile of the component; then use the clamping components (10) on both sides of the device to fix the component; after completing the fixation, use a machine tool to fix the central rib (A1) on the component and at least two lateral symmetrically arranged side ribs Measure the Z coordinate of the top of the bar (A2). If the deviation value of the Z coordinate of the top of the two laterally symmetrically arranged side bars is within 0.5mm, it indicates that the component is in good position after clamping and fixing; remove the positioning plate (6), and use machine tools to measure the initial flatness of the side of the component; S3. Rough cutting of components: First, use a machine tool to draw the final cutting line of the component to prevent over-cutting; then rough cut the component, and control the chord length process margin of 5~10mm on each side during rough cutting. In order to prevent the release of residual stress from causing serious deformation of the component; at the same time, in order to ensure that the component still has sufficient stiffness during the cutting process, several process structures (11) are left on both sides of the component; after rough cutting is completed, remove the clamping assembly (10) , then use a machine tool to measure the chord lengths of the two ends of the component in the length direction, then lift the component to make it vertical and in a free state, measure the chord lengths of the upper and lower parts of the component, and compare them with the two ends measured on the machine tool. String length comparison; S4. Precision cutting of the component: Repeat steps S1 and S2 to position and fix the component rough-cut in step S3 again; use the average chord length method to perform multiple precision cuts on the component so that the process margin on both sides of the component gradually increases. Reduce until the single-sided process margin is 0.2~0.5mm, and finally perform light knife processing to reduce the surface roughness of the part; S5. Milling of the lower end face: After precision cutting on both sides of the component, the lower end face of the component is milled; S6. Accuracy detection: Manually remove the remaining process structures (11) on both sides of the component, use an ultrasonic thickness gauge to measure the thickness of the lower end face of the component, and then lift the component vertically to scan the inner surface to measure the accuracy. 2. The method according to claim 1, characterized in that the bottom plate (1), the transverse clamping plate (2) and the longitudinal clamping plate (3) are all provided with a number of weight-reducing holes, and the The holes opened on the bottom plate avoid the transverse clamping plate (2) and the longitudinal clamping plate (3). 3. The method according to claim 1, characterized in that 4 to 6 adjustable bolts (9) are provided at intervals on each third support plate; the width of the support plate is 70 to 100 mm. 4. The method according to claim 1, characterized in that the interference avoidance platform (8) is a platform with a depth of 10~20mm cut downward from the center point of the arc-shaped support surface. 5. The method according to claim 1, characterized in that in step S1, after positioning is completed, a machine tool is used to measure the coordinates of the central rib (A1) of the component along the axial direction to check whether it is on a straight line. , otherwise use the circumferential positioning adjustment mechanism (4) to slightly adjust the component until it meets the requirements. 6. The method according to claim 1, characterized in that in step S2, in order to prevent the component from tilting to one side during the clamping and fixing process, the symmetrical positions on both sides of the component are clamped simultaneously, and the clamping When fixing, place the dial indicator at the clamping position and control the deformation of the dial indicator within 0.5mm. 7. The method according to claim 1, characterized in that, in the step S4, during the first precision cutting, a process margin of 0.8~1.5mm is reserved on both sides of the component, and measured on the machine tool after cutting The chord length of the upper and lower parts of the component; then, the lateral sides of the component are precisely cut with a process allowance of 0.6~1mm each time until the process allowance on one side is 0.2~0.5mm. 8. The method according to claim 7, characterized in that after each cutting, the deviation value of the upper and lower chord lengths of the component is d. After completing the fine cutting, the chord length of the upper part of the component is the final target chord length plus the deviation value. The sum of half of d, the chord length of the lower part of the member is the final target chord length minus half of the deviation value d.