A method for processing an annular land face based on segmented processing

Abstract

The application discloses a kind of annular collar face processing methods based on segmented processing, comprising the following steps: S1, processing segmentation: the annular collar face is divided into three processing sections: first continuous processing section L1, strong discontinuous processing section L2 and second continuous processing section L3;S2, segmented layered processing: layered cutting is respectively performed to the first continuous processing section L1, strong discontinuous processing section L2 and second continuous processing section L3, and different cutting parameters are used;S3, overall finishing: the entire collar face after completing segmented layered processing is finally finished with one knife, to achieve the specified flatness requirement.The processing method of the application effectively controls the problem of tool rapid wear caused by strong discontinuous cutting, makes the allowance reserved before finishing of each section more uniform, significantly improves the final flatness accuracy of the collar face, improves the reliability of the machining process and the product qualification rate, reduces tool wear and production cost.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of machining, in particular to a machining method for an annular stop face based on segmented machining. BACKGROUND

[0002] In high-end equipment such as aero-engine and spacecraft structural parts, the mounting edge connection stop face of a part has a very high flatness requirement, usually requiring a flatness of ≤0.05 mm. These parts not only have difficult-to-machine materials, but also have numerous holes distributed on the stop surface for weight reduction, bolt connection and component assembly. At present, the general machining process for such features in the industry is to reserve about 0.2-0.3 mm of machining allowance for the finishing process after rough machining or semi-finishing, and then use a layered cutting strategy for finishing. Specifically, the existing technical solution controls the tool to continuously cut along the entire annular stop face, each layer of cutting covering the entire annular area from the outer diameter to the inner diameter, and gradually removing the material through several layers of cutting, and finally performing a final one-cut finishing to meet the size requirement.

[0003] Reference Figure 1 and Figure 2 A large number of connection holes are distributed on the mounting edge stop face, and the outermost circle diameter of the stop face is d o and the innermost circle diameter is d i . 1, 2, 3 and 4 are layered cutting paths and final machining paths for machining the stop face. As can be seen, the tool needs to repeatedly undergo a strong intermittent cutting process of "cutting into the material - cutting out the void" during cutting, and withstands severe mechanical and thermal shocks, resulting in extremely fast tool edge wear. This wear is not evenly distributed: during each layer of cutting, the tool has a significant progressive wear from the starting point to the end point of the path. This directly leads to the actual cutting amount of the tool at the end point being smaller than that at the starting point in each layer of cutting, so that the residual amount of material at the end point is relatively larger. This effect accumulates layer by layer, causing the reserved allowance on the entire stop face to be in a serious uneven state before final finishing. When finishing, due to the serious unevenness of the cutting allowance, the cutting force fluctuates violently, making it difficult to ensure cutting stability, so that the machined surface cannot meet the requirement of flatness ≤0.05 mm, often exceeding 0.07 mm or even more, resulting in a high product rejection rate, which becomes a core bottleneck restricting production quality and efficiency.

[0004] Therefore, overcoming the problem of uneven machining allowance caused by rapid tool wear under strong intermittent working conditions is the key to realizing stable machining of high flatness. SUMMARY

[0005] To address the problems existing in the prior art, this invention provides a method for machining annular stop surfaces based on segmented machining. The core concept of this method is to change the traditional overall machining strategy and achieve effective management of tool wear and precise control of machining allowance through a strategy of zoned control and differentiated machining, ultimately ensuring high-flatness machining quality. The technical solution is as follows:

[0006] A method for machining annular stop surfaces based on segmented machining, wherein the stop surface is the annular end face of the workpiece with multiple connecting holes distributed thereon, the method includes reserving machining allowance for the finishing process after roughing or semi-finishing, and performing finishing by layered cutting; including the following steps:

[0007] S1. Processing Segmentation: The annular stop surface is divided into three processing segments: a first continuous processing segment L1, a strongly discontinuous processing segment L2, and a second continuous processing segment L3; the strongly discontinuous processing segment L2 is located between the first continuous processing segment L1 and the second continuous processing segment L3; the strongly discontinuous processing segment L2 is an annular area covering all the connecting holes.

[0008] S2. Segmented and layered machining: Layered cutting is performed on the first continuous machining segment L1, the strongly intermittent machining segment L2, and the second continuous machining segment L3 respectively, and different cutting parameters are used until each segment surface has a uniform final finishing allowance with the same value.

[0009] S3. Overall finishing: Perform a final finishing cut on the entire stop surface after the segmented and layered machining to achieve the specified flatness requirements.

[0010] Optionally, in step S2, the first cutting parameters are used for the layered cutting of the first continuous machining segment L1 and the second continuous machining segment L3, and the second cutting parameters are used for the layered cutting of the strongly discontinuous machining segment L2; the second cutting parameters are a more conservative combination of parameters that can better protect the tool compared to the first cutting parameters.

[0011] Optionally, the more conservative cutting parameters are reflected in the fact that the depth of cut per layer used for layer cutting of the strongly discontinuous machining segment L2 is less than the depth of cut per layer used for layer cutting of the first continuous machining segment L1 or the second continuous machining segment L3.

[0012] Optionally, the cutting depth of each layer in the first continuous machining section L1 and the second continuous machining section L3 is 0.04-0.06 mm, and the cutting depth of each layer in the strongly discontinuous machining section L2 is 0.02-0.04 mm.

[0013] Optionally, the more conservative cutting parameters are also reflected in: when machining the strongly discontinuous machining section L2, the cutting speed is dynamically adjusted, a first cutting speed is used when the tool cuts through the solid material part, and a second cutting speed lower than the first cutting speed is used when the tool cuts through the connecting hole position.

[0014] Optionally, in step S2, the final finishing allowance is 0.04-0.06 mm, and the allowance values ​​of each section of the first continuous machining section L1, the strongly intermittent machining section L2, and the second continuous machining section L3 are controlled within ±0.01 mm.

[0015] Optionally, the specific order of segmented and layered processing in step S2 is as follows: first complete the layered cutting of the first continuous processing segment L1, then complete the layered cutting of the strongly discontinuous processing segment L2, and finally complete the layered cutting of the second continuous processing segment L3.

[0016] Optionally, the workpiece is made of one of the following materials: high-temperature alloy, titanium alloy, or high-strength stainless steel.

[0017] Optionally, the flatness requirement of the stop surface is no greater than 0.05 mm.

[0018] The beneficial effects of the technical solution provided in this application include at least the following: First, by dividing the annular stop surface into a first continuous machining section L1, a strongly intermittent machining section L2, and a second continuous machining section L3 according to the distribution of holes, and using different cutting parameters for each section, the method effectively controls the problem of rapid tool wear caused by strongly intermittent cutting, making the allowance reserved before finishing more uniform in each section; Second, because the uniformity of the allowance is guaranteed, the cutting force during the final finishing cut is stable, avoiding phenomena such as tool deflection and chatter caused by uneven allowance, thereby significantly improving the final flatness accuracy of the stop surface and stably achieving the high standard flatness requirement of ≤0.05mm; In addition, this method improves the reliability of the machining process and the product qualification rate, reduces tool wear and production costs, and is suitable for high-precision machining of various difficult-to-machine materials such as high-temperature alloys and titanium alloys.

[0019] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of a part with multiple holes on the mounting edge stop surface;

[0022] Figure 2 This is a schematic diagram of the layered tool path and the final machining tool path for machining the stop surface in the prior art;

[0023] Figure 3 This is a perspective view of the high-pressure turbine casing provided in Embodiment 1 of this application;

[0024] Figure 4 This is a top view of the high-pressure turbine casing provided in Embodiment 1 of this application;

[0025] Figure 5 This is a schematic diagram of the layered tool path and the final machining tool path for machining the stop surface of the high-pressure turbine casing using the machining method of this application;

[0026] Figure 6 This is a three-dimensional schematic diagram of the structural support provided in Embodiment 2 of this application;

[0027] Figure 7 This is a top view of the structural support provided in Embodiment 2 of this application;

[0028] Figure 8 This is a schematic diagram of the layered tool path and the final machining tool path for machining the stop surface of the structural support using the machining method of this application.

[0029] Explanation of reference numerals in the attached figures

[0030] 5-High-pressure turbine casing; 501-Through hole; 6-Structural support; 601-Weight reduction hole; 602-Connection hole. Detailed Implementation

[0031] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0032] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, and "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0033] A method for machining annular stop surfaces based on segmented machining, wherein the stop surface is the annular end face of the workpiece with multiple connecting holes distributed thereon, the method includes reserving machining allowance for the finishing process after roughing or semi-finishing, and performing finishing by layered cutting; the machining method includes the following steps:

[0034] S1. Processing Segmentation: The annular stop surface is divided into three processing segments: a first continuous processing segment L1, a strongly discontinuous processing segment L2, and a second continuous processing segment L3; the strongly discontinuous processing segment L2 is located between the first continuous processing segment L1 and the second continuous processing segment L3; the strongly discontinuous processing segment L2 is an annular area covering all the connecting holes.

[0035] S2. Segmented and layered machining: Layered cutting is performed on the first continuous machining segment L1, the strongly intermittent machining segment L2, and the second continuous machining segment L3 respectively, and different cutting parameters are used until each segment surface has a uniform final finishing allowance with the same value.

[0036] S3. Overall finishing: Perform a final finishing cut on the entire stop surface after the segmented and layered machining to achieve the specified flatness requirements.

[0037] It should be noted that when the connecting holes are distributed on circumferences of different diameters, the strongly discontinuous processing section L2 is the smallest continuous annular area covering all the connecting hole distributions.

[0038] This invention employs a segmented, layered machining strategy combined with differentiated cutting parameters, offering the following advantages: First, by dividing the annular stop surface into a first continuous machining segment, a strongly intermittent machining segment, and a first continuous machining segment based on the hole distribution, and using different cutting parameters for each segment, the rapid tool wear caused by strongly intermittent cutting is effectively controlled, resulting in a more uniform allowance before finishing in each segment. Second, due to the guaranteed uniformity of the allowance, the cutting force during the final single-pass finishing is stable, avoiding phenomena such as tool deflection and chatter caused by uneven allowance, thereby significantly improving the final flatness accuracy of the stop surface and consistently achieving a high standard flatness requirement of ≤0.05mm. Furthermore, this method improves the reliability of the machining process and the product qualification rate, reduces tool wear and production costs, and is suitable for high-precision machining of various difficult-to-machine materials such as high-temperature alloys and titanium alloys.

[0039] Optionally, in step S2, a first cutting parameter is used for the layered cutting of the first continuous machining segment L1 and the second continuous machining segment L3, and a second cutting parameter is used for the layered cutting of the strongly discontinuous machining segment L2. The second cutting parameter is a more conservative parameter combination that better protects the tool compared to the first cutting parameter. In this embodiment, more efficient parameters can be used for the first continuous machining segment L1 and the second continuous machining segment L3 to ensure basic machining efficiency; while more conservative parameters are used for the strongly discontinuous machining segment L2, which directly and specifically alleviates the problem of severe tool wear in this area, fundamentally controlling the uniformity of machining allowance within the segment, which is the core guarantee for achieving high flatness.

[0040] Optionally, the more conservative cutting parameters are reflected in the following: the depth of cut per layer used for layer cutting in the strongly discontinuous machining section L2 is less than the depth of cut per layer used for layer cutting in the first continuous machining section L1 and the second continuous machining section L3. In this step, by setting different depths of cut, the cutting force of a single cut is significantly reduced, thereby greatly reducing the mechanical and thermal shocks experienced by the tool when cutting into and out of the hole, effectively suppressing tool chipping and abnormal wear, extending tool life, and making the amount of material removed in each layer more controllable, providing a precise guarantee for reserving uniform allowance for finishing.

[0041] Optionally, the cutting depth of each layer in the first continuous machining segment L1 and the second continuous machining segment L3 is 0.04-0.06 mm, and the cutting depth of each layer in the strongly discontinuous machining segment L2 is 0.02-0.04 mm. In this embodiment, this range ensures sufficient machining efficiency for the continuous segments while providing adequate protection for the strongly discontinuous machining segment L2, finding the optimal balance between efficiency and reliability, thus giving this method high repeatability and engineering practical value.

[0042] Optionally, the more conservative cutting parameters are further reflected in: dynamically adjusting the cutting speed during the machining of the strongly intermittent machining segment L2; using a first cutting speed when the tool cuts through the solid material, and using a second cutting speed lower than the first cutting speed when the tool cuts through the connecting hole. In this embodiment, the working state of the tool during intermittent cutting is further optimized. Maintaining a normal speed when passing through the solid material to ensure efficiency, and automatically reducing the speed when passing through the hole to buffer cutting impact, further smooths the cutting force fluctuations. This is a key auxiliary means to protect the tool edge and improve machining stability.

[0043] Optionally, in step S2, the final finishing allowance is 0.04-0.06 mm, and the deviation of the allowance values ​​on the surfaces of the first continuous machining section L1, the strongly intermittent machining section L2, and the second continuous machining section L3 is controlled within ±0.01 mm. This embodiment provides a decisive condition for the success of the final single-cut finishing. The uniform and precise 0.05 mm allowance ensures that the cutting force of the last cut is extremely stable, completely eliminating defects such as tool deflection and chatter marks caused by allowance fluctuations, thereby ensuring the production of a plane with ultra-high precision flatness.

[0044] Optionally, the specific sequence of segmented and layered machining in step S2 is as follows: first, complete the layered cutting of the first continuous machining segment L1; then, complete the layered cutting of the strongly discontinuous machining segment L2; and finally, complete the layered cutting of the second continuous machining segment L3. In this embodiment, the first continuous machining segment L1 is machined first to establish a stable machining datum for the part; then, the strongly discontinuous machining segment L2, which has the greatest risk of stress deformation, is processed in a concentrated manner. At this time, the workpiece clamping rigidity is the best, which can suppress vibration to the maximum extent; finally, the second continuous machining segment L3 is machined to avoid interference from subsequent cutting of the already machined L2 segment, thus ensuring the stability of the final forming.

[0045] Optionally, the workpiece is made of one of the following materials: high-temperature alloy, titanium alloy, or high-strength stainless steel. High-temperature alloys, titanium alloys, and high-strength stainless steel are commonly used in aerospace and other fields. These materials are typically difficult to machine; their high strength, high toughness, and poor thermal conductivity make controlling tool wear and ensuring accuracy extremely challenging in interrupted cutting. This embodiment, through a segmented differentiated machining strategy, effectively addresses the challenges posed by these material characteristics, significantly improving the machining pass rate and quality stability of such high-value critical parts, and greatly expanding the applicability of advanced manufacturing processes. In practical applications, the materials may include, but are not limited to, those listed above.

[0046] Optionally, the flatness requirement of the stop surface is no greater than 0.05 mm. This embodiment quantitatively demonstrates the superior technical effects achievable by the method of the present invention, providing a clear and measurable criterion for judging its technical advancement and whether it can meet the stringent requirements of high-end equipment.

[0047] The implementation principle of this processing method is further illustrated below through two specific embodiments.

[0048] Example 1: Reference Figure 3 , Figure 4 and Figure 5 , Figure 3The high-pressure turbine casing 5 is made of nickel-based high-temperature alloy GH4169. The width L of the annular stop surface on the mounting edge of the high-pressure turbine casing is 30mm, and it has 15 φ16 through holes 501 distributed thereon, with a flatness requirement of ≤0.05mm. In this embodiment, the through holes 501 are of uniform size and evenly distributed. The innermost circle diameter of the annular stop surface is d1, the outermost circle diameter is d2, and the central axis of the through holes 501 is O1. 1, 2, 3, and 4 are the layered tool paths and the final machining tool paths for machining the stop surface.

[0049] The specific operating steps are as follows:

[0050] 1. Pre-processing and clamping: After semi-finish turning, leave a 0.25mm allowance on each side of the stop surface. Reliably clamp it on a CNC vertical lathe. Divide the stop surface into the first continuous machining section L1, the strongly intermittent machining section L2, and the second continuous machining section L3.

[0051] Since the theoretical diameter of the φ16 through hole 501 is 16mm, its theoretical radius is 8mm. In theoretical design, the boundary of segment L2 should be located at the theoretical edge of the hole, i.e., 8mm from the hole's central axis. However, considering the tool setting error, machine tool positioning accuracy, and dimensional tolerances of the hole itself in actual machining, to ensure the reliability and repeatability of the machining scheme, a small safety margin needs to be added outward from the theoretical boundary in engineering implementation. Therefore, this embodiment is defined according to the following rules:

[0052] First continuous processing section L1: starting point: the outermost circumferential contour line of the annular end face of the stop; ending point: the center axis of through hole 101 offset outward by 8.1mm, where the theoretical value is 8mm and 0.1mm is a safety margin.

[0053] Strongly intermittent machining segment L2: Start point: 8.1mm outward from the center axis of through hole 501, which is the end point of segment L1; End point: 8.1mm inward from the center axis of through hole 501, where the theoretical value is 8mm and 0.1mm is a safety margin.

[0054] The second continuous processing section L3: starting point: 8.1mm inward offset from the center axis of through hole 501, which is the end point of section L2; ending point: the innermost circumferential contour line of the annular end face of the stop.

[0055] 2. Segmented and Layered Finishing: Machining the first continuous machining segment L1: Using the first cutting parameters. Spindle speed Vc = 30 m / min, feed rate F = 0.08 mm / rev, depth of cut Ap = 0.05 mm per layer. Cutting is done in 4 layers, with a final allowance of 0.05 mm for this segment.

[0056] 3. Machining the intermittent machining section L2: The second cutting parameters are used. Spindle speed Vc = 25 m / min, feed rate F = 0.05 mm / rev, depth of cut Ap = 0.03 mm per layer. Dynamic speed adjustment is implemented: the spindle speed automatically decreases to Vc = 20 m / min when passing through holes. Cutting is performed in 6 layers, with a final allowance of 0.05 mm for this section. Dynamic speed adjustment is achieved through the macro program function of the CNC system or advanced CAM programming, determining and calling different spindle speeds based on tool angle or coordinate position.

[0057] 4. Machining the second continuous machining section L3: Parameters are the same as the first continuous machining section L1. Cut in 4 layers, with a final allowance of 0.05mm.

[0058] 5. Final finishing: Perform a single finishing cut on the entire stop surface, with a depth of 0.05mm, to achieve a flatness of ≤0.05mm.

[0059] Results: Upon inspection, the flatness of the fifth stop surface of the turbine casing of the aero-engine was found to be 0.04mm, which is qualified.

[0060] Example 2: Reference Figure 6 , Figure 7 and Figure 8 , Figure 6 For a structural support 6 made of titanium alloy TC4, the annular stop surface of the structural support 6 has a width L of 30mm and contains 5 Φ6mm weight-reducing holes 601 and 15 Φ12mm connecting holes 602. The diameter of the circle containing the 15 Φ12mm connecting holes 602 is larger than the diameter of the circle containing the 5 Φ6mm weight-reducing holes 601. The flatness requirement of the stop surface is ≤0.05mm. The central axis of the weight-reducing holes 601 is O2, and the central axis of the connecting holes 602 is O3. The innermost circle diameter of the annular stop surface is d3, and the outermost circle diameter is d4. Steps 1, 2, 3, and 4 are the layered toolpaths for machining the stop surface and the final machining toolpath. The specific operation steps are as follows:

[0061] 1. Pre-processing and clamping: After semi-finish turning, leave a 0.22mm allowance on each side of the stop surface. Clamp the workpiece on a CNC vertical lathe using a special fixture. Divide the stop surface into the first continuous machining section L1, the strongly intermittent machining section L2, and the second continuous machining section L3.

[0062] Partition Boundary Definition Explanation: Considering the tool setting errors, machine tool positioning accuracy, and hole position tolerances present in actual machining, to ensure the reliability and repeatability of the machining scheme, this embodiment adopts the following rules to define the partition boundaries:

[0063] First continuous processing section L1: starting point: the outermost circumferential contour line of the annular stop end face; ending point: the center axis of the connecting hole 602 is offset outward by 6.1mm, where the theoretical value is 6mm and 0.1mm is a safety margin.

[0064] Strongly intermittent processing section L2: Start point: 6.1mm outward offset from the center axis of connecting hole 602, which is the end point of section L1; End point: 3.1mm inward offset from the center axis of weight reduction hole 601, where the theoretical value is 3mm and 0.1mm is a safety margin.

[0065] The second continuous processing section L3: starting point: 3.1mm inward offset from the center axis of the weight reduction hole 601, which is the end point of section L2; ending point: the innermost circumferential contour line of the annular end face of the stop.

[0066] 2. Segmented and layered finishing:

[0067] Machining the first continuous machining section L1: Using the first cutting parameters. Spindle speed Vc = 55 m / min, feed rate F = 0.1 mm / rev, depth of cut Ap = 0.04 mm per layer. Cutting in 3 layers, with a final allowance of 0.05 mm for this section.

[0068] Machining the intermittent machining section L2: The second cutting parameters are used. Spindle speed Vc = 50 m / min, feed rate F = 0.07 mm / rev, depth of cut Ap = 0.02 mm per layer. Dynamic speed adjustment is implemented: the spindle speed automatically decreases to Vc = 40 m / min when passing through holes. Cutting is performed in 8 layers, with a final allowance of 0.05 mm for this section. Dynamic speed adjustment is achieved through the macro program function of the CNC system or advanced CAM programming, determining and calling different spindle speeds based on tool angle or coordinate position.

[0069] Machining the second continuous machining section L3: Parameters are the same as the first continuous machining section L1. Cut in 3 layers, with a final allowance of 0.05mm.

[0070] 3. Final finishing: Perform a single-cut finishing on the entire annular stop surface, with a cutting depth of 0.05mm, to achieve a flatness of ≤0.05mm.

[0071] Results: According to the coordinate measuring machine, the flatness of the stop surface of the titanium alloy structure bracket is 0.037mm, and the wear value of the tool flank is less than 0.15mm, indicating that the machining quality is fully qualified.

[0072] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0073] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0074] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for machining an annular stop surface based on segmented machining, wherein the stop surface is the annular end face of a workpiece with multiple connecting holes distributed thereon, the method comprising reserving machining allowance for a finishing process after roughing or semi-finishing, and performing finishing by layered cutting, characterized in that, Includes the following steps: S1. Processing Segmentation: The annular stop surface is divided into three processing segments: a first continuous processing segment L1, a strongly discontinuous processing segment L2, and a second continuous processing segment L3; the strongly discontinuous processing segment L2 is located between the first continuous processing segment L1 and the second continuous processing segment L3; the strongly discontinuous processing segment L2 is an annular area covering all the connecting holes. S2. Segmented and layered machining: Layered cutting is performed on the first continuous machining segment L1, the strongly intermittent machining segment L2, and the second continuous machining segment L3 respectively, and different cutting parameters are used until each segment surface has a uniform final finishing allowance with the same value. S3. Overall finishing: Perform a final finishing cut on the entire stop surface after the segmented and layered machining to achieve the specified flatness requirements.

2. The processing method according to claim 1, characterized in that, In step S2, the first cutting parameters are used for the layered cutting of the first continuous machining segment L1 and the second continuous machining segment L3, and the second cutting parameters are used for the layered cutting of the strongly discontinuous machining segment L2.

3. The processing method according to claim 2, characterized in that, The depth of cut per layer used for layer cutting of the strongly discontinuous machining section L2 is less than the depth of cut per layer used for layer cutting of the first continuous machining section L1 or the second continuous machining section L3.

4. The processing method according to claim 3, characterized in that, The cutting depth of each layer in the first continuous machining section L1 and the second continuous machining section L3 is 0.04-0.06 mm, and the cutting depth of each layer in the strongly discontinuous machining section L2 is 0.02-0.04 mm.

5. The processing method according to claim 2, characterized in that, When machining the strongly discontinuous machining section L2, the cutting speed is dynamically adjusted. A first cutting speed is used when the tool cuts through the solid material, and a second cutting speed lower than the first cutting speed is used when the tool cuts through the connecting hole.

6. The processing method according to claim 1, characterized in that, In step S2, the final finishing allowance is 0.04-0.06 mm, and the allowance values ​​of each section of the first continuous machining section L1, the strongly intermittent machining section L2, and the second continuous machining section L3 are controlled within ±0.01 mm.

7. The processing method according to claim 1, characterized in that, The specific sequence of segmented and layered machining in step S2 is as follows: first, complete the layered cutting of the first continuous machining segment L1, then complete the layered cutting of the strongly discontinuous machining segment L2, and finally complete the layered cutting of the second continuous machining segment L3.

8. The processing method according to claim 1, characterized in that, The workpiece is made of one of the following materials: high-temperature alloy, titanium alloy, or high-strength stainless steel.

9. The processing method according to claim 1, characterized in that, The flatness requirement for the stop surface is no greater than 0.05 mm.

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