Unified reference and integrated process method for high-precision and high-efficiency machining of cartridge receiver

Abstract

The invention discloses a unified reference and integrated process method for high-precision and high-efficiency machining of a cartridge receiver, which comprises the following steps of: S1, classifying and dividing reference surfaces into a first reference surface, a second reference surface and a third reference surface according to the number of machining precision requirements corresponding to each reference surface on the cartridge receiver, then processing a first reference surface, a second reference surface and a third reference surface in sequence; s2, screening out the machining size, which can establish a relation with the first datum plane through geometric operation, of the reference datum plane, and converting the machining precision of the screened machining size referring to the original datum plane into the machining precision referring to the first datum plane; s3, a dimension chain analysis method is adopted to evaluate the machining precision after the machining dimension is converted into the benchmark so as to judge whether the machining precision after the machining dimension is converted into the benchmark meets the design requirement or not, and the original machining precision is adjusted; and S4, a machining principle is given according to the reference surface of the machining size, the machining technology and the machining area, so that the machining sequence of the machining size is determined.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine parts processing, and in particular to a unified benchmark and integrated process method for high-precision and high-efficiency processing of casings. Background Art

[0002] As a key component of an aircraft engine, the casing is directly related to the performance, safety and maintainability of the aircraft engine. Therefore, efficient and high-precision processing of the casing is crucial.

[0003] However, in the existing casing processing process, since casing parts usually have multiple processing surfaces and different datums, and different datums need to correspond to different processing procedures, each time the datum is changed, positioning errors will be introduced. These positioning errors will gradually accumulate, affecting the processing accuracy of subsequent processes. Different processing surfaces require the use of different fixtures or process routes, which not only increases the number of processes, but also leads to error transmission during clamping and processing. In addition, frequent datum conversions will increase the number of clamping times and the complexity of operations, resulting in unstable processing and difficult to control processing accuracy. Moreover, since casing parts need to be clamped multiple times, each clamping may cause unstable positioning of the workpiece, resulting in the accumulation of processing errors. In addition, in existing processes, the process arrangement often lacks global optimization, and the connection between many processes is not tight enough. For example, there is redundancy between some processes, or the order is unreasonable, which may cause the position of the previously processed surface to change in the subsequent process, affecting the processing accuracy.

[0004] In summary, due to the large number of processing datums, frequent datum conversions, many processes and clamping times, and unreasonable processing sequence installation during the processing of the casing, the processing efficiency and accuracy of the casing are significantly reduced. Summary of the Invention

[0005] The present invention provides a unified datum and integrated process method for high-precision and efficient processing of casings, so as to solve the technical problems in the existing casing processing process, such as multiple processing datums, frequent datum conversion, many processes and clamping times, unreasonable processing sequence installation, and low processing efficiency and precision of the casing.

[0006] According to one aspect of the present invention, a unified datum and integrated process method for high-precision and high-efficiency processing of a casing is provided, comprising the following steps: S1: classifying the datum surfaces into a first datum surface, a second datum surface and a third datum surface according to the number of processing accuracy requirements corresponding to each datum surface on the casing, and then sequentially processing the first datum surface, the second datum surface and the third datum surface; S2: screening out processing dimensions that can be linked to the first datum surface through geometric operations with reference to the datum surface, and converting the screening out processing dimensions with reference to the processing accuracy of the original datum surface into the processing accuracy with reference to the first datum surface; S3: using the dimension chain analysis method to evaluate the processing accuracy of the processing dimensions after the conversion of the datum to determine whether the processing accuracy of the processing dimensions after the conversion of the datum to the datum meets the design requirements; if it meets the design requirements, it is executed according to the original processing accuracy; if it does not meet the design requirements, the original processing accuracy is adjusted; S4: given processing principles based on the reference datum surface, processing technology and processing area of ​​the processing dimensions to determine the processing sequence of the processing dimensions.

[0007] As a further improvement of the above technical solution:

[0008] Furthermore, step S1 specifically includes the following steps: analyzing the reference datum surfaces of all processing dimensions of the casing, listing the number of processing accuracy requirements corresponding to each datum surface in turn, sorting the datum surfaces in descending order from front to back according to the number of processing accuracy requirements, classifying the first 20% of the datum surfaces as the first datum surfaces, classifying the first 20%-50% of the datum surfaces as the second datum surfaces, and classifying the last 50% of the datum surfaces as the third datum surfaces, and then processing the first datum surface, the second datum surface and the third datum surface in sequence.

[0009] Furthermore, in step S4, the processing principles include principle one, principle two and principle three. Principle one is to sequentially process the processing dimensions of the reference first reference plane, the reference second reference plane and the reference third reference plane. Principle two is to perform milling before drilling, and during milling, perform face milling before side milling. Principle three is to process the area of ​​the processing area first large and then small. The priority of the processing sequence determined by principles one, two and three decreases in sequence.

[0010] Furthermore, adjusting the original processing accuracy specifically includes the following steps: improving the processing accuracy of the processing size referenced to the original reference surface to determine whether the processing accuracy after the processing size conversion reference meets the design requirements; if it meets the design requirements, it is executed according to the adjusted processing accuracy; if it does not meet the design requirements, the adjusted processing accuracy is adjusted again until the processing accuracy after the processing size conversion reference meets the design requirements.

[0011] Furthermore, the following specific steps are performed to convert the processing accuracy of the screened processing dimensions with reference to the original datum plane into the processing accuracy with reference to the first datum plane: construct a dimension chain model for converting the original datum plane into the first datum plane, determine the tolerance of each link in the dimension chain model to calculate the tolerance accumulation after the datum conversion, and then identify the geometric relationship between the original datum plane and the first datum plane to construct a geometric error model to quantify the geometric error between the original datum plane and the first datum plane, and then correct the tolerance accumulation through the geometric error, and finally obtain the processing accuracy of the processing dimensions with reference to the first datum plane through the processing accuracy of the processing dimensions with reference to the original datum plane and the corrected tolerance accumulation.

[0012] Furthermore, in step S1, after the first reference surface is machined, the second reference surface and the third reference surface are machined in sequence using the first reference surface as the clamping surface.

[0013] Furthermore, the first reference surface also includes a large-size continuous end surface and a clamping deformation sensitive surface.

[0014] Furthermore, the processing requirements for the first reference surface are: flatness less than 5um, surface roughness less than 0.4, and hardness of the clamping area not less than 45HRC.

[0015] Furthermore, the processing requirements for the second reference surface are: flatness less than 8um, surface roughness less than 0.8, and hardness of the clamping area not less than 40HRC.

[0016] Furthermore, the processing requirements for the third reference surface are: flatness less than 10um, surface roughness less than 1, and hardness of the clamping area not less than 30HRC.

[0017] The present invention has the following beneficial effects:

[0018] The unified datum and integrated process method for high-precision and high-efficiency processing of a casing of the present invention classifies the datum surfaces into a first datum surface, a second datum surface and a third datum surface according to the number of processing accuracy requirements corresponding to each datum surface on the casing, and then processes the first datum surface, the second datum surface and the third datum surface in sequence, ensuring that the first datum surface with high-precision requirements can be processed first, forming a processing flow that gradually progresses from high precision to low precision, optimizing the processing sequence, improving the systematicness and stability of the processing technology, and optimizing the allocation of process resources to improve processing efficiency, maximize the accuracy transfer effect, reduce error transfer, and improve processing quality; screen out processing dimensions that can establish a connection with the first datum surface through geometric operations with reference to the datum surface, and convert the screened processing dimensions with reference to the processing accuracy of the original datum surface into the processing accuracy with reference to the first datum surface, so as to achieve datum unification as much as possible, reduce the number of processing datums, thereby correspondingly reducing the number of processes and clamping times, and realizing process integration; adopt the dimension chain analysis method to evaluate The processing accuracy after the processing size conversion benchmark is used to judge whether the processing accuracy after the processing size conversion benchmark meets the design requirements. If it meets the design requirements, it will be executed according to the original processing accuracy. If it does not meet the design requirements, the original processing accuracy will be adjusted to ensure that the processing accuracy after the conversion meets the requirements, thereby ensuring that the quality and function of the finished receiver meet the requirements; the processing principles are given based on the reference datum surface, processing technology and processing area of ​​the processing size to determine the processing sequence of the processing size. Through a reasonable processing sequence, process integration is achieved, which reduces redundant processes and processing steps, so that each process can be efficiently and accurately connected; this scheme achieves high-precision and efficient processing of the receiver through datum surface classification, datum conversion unification, processing accuracy adjustment, reasonable installation processing sequence and process integration. Compared with the existing technology, it reduces the number of datums and processes, reduces the frequency of datum conversion, reduces the error accumulation caused by datum conversion, improves processing efficiency and accuracy, has strong practicality, and is suitable for wide promotion and application.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a step diagram of a unified benchmark and integrated process method for high-precision and high-efficiency processing of a casing according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0023] like Figure 1 As shown, the unified datum and integrated process method for high-precision and high-efficiency processing of the casing of this embodiment includes the following steps: S1: classifying the datum surfaces into the first datum surface, the second datum surface and the third datum surface according to the number of processing accuracy requirements corresponding to each datum surface on the casing, and then processing the first datum surface, the second datum surface and the third datum surface in sequence; S2: screening out processing dimensions that can be connected to the first datum surface through geometric operations with reference to the datum surface, and converting the screening out processing dimensions with reference to the processing accuracy of the original datum surface into the processing accuracy with reference to the first datum surface; S3: using the dimension chain analysis method to evaluate the processing accuracy of the processing dimensions after the conversion of the datum to determine whether the processing accuracy of the processing dimensions after the conversion of the datum to the datum meets the design requirements. If it meets the design requirements, it is executed according to the original processing accuracy. If it does not meet the design requirements, the original processing accuracy is adjusted; S4: given processing principles based on the reference datum surface, processing technology and processing area of ​​the processing dimensions to determine the processing sequence of the processing dimensions.

[0024] like Figure 1As shown, specifically, the unified datum and integrated process method for high-precision and high-efficiency processing of a casing of the present invention classifies the datum surfaces into a first datum surface, a second datum surface, and a third datum surface according to the number of processing accuracy requirements corresponding to each datum surface on the casing, and then processes the first datum surface, the second datum surface, and the third datum surface in sequence, ensuring that the first datum surface with high-precision requirements can be processed first, forming a processing flow that gradually progresses from high precision to low precision, optimizing the processing sequence, improving the systematicness and stability of the processing technology, and optimizing the allocation of process resources to improve processing efficiency, maximize the accuracy transfer effect, reduce error transfer, and improve processing quality; screen out processing dimensions that can establish a connection with the first datum surface through geometric operations with reference to the datum surface, and convert the screened processing dimensions with reference to the processing accuracy of the original datum surface into the processing accuracy with reference to the first datum surface, so as to achieve datum unification as much as possible, reduce the number of processing datums, thereby correspondingly reducing the number of processes and clamping times, and realizing process integration; The dimension chain analysis method is used to evaluate the machining accuracy after the machining dimension conversion datum, so as to judge whether the machining accuracy after the machining dimension conversion datum meets the design requirements. If it meets the design requirements, it is executed according to the original machining accuracy. If it does not meet the design requirements, the original machining accuracy is adjusted to ensure that the machining accuracy after the conversion meets the requirements, thereby ensuring that the quality and function of the finished receiver meet the requirements; the machining principles are given according to the reference datum plane of the machining dimension, the machining process and the machining area to determine the machining sequence of the machining dimension. Through a reasonable machining sequence, process integration is achieved, which reduces redundant processes and processing steps, so that each process can be efficiently and accurately connected; this scheme realizes the machining of the receiver by classifying and dividing the datum plane, unifying the datum conversion, adjusting the machining accuracy and integrating the processes. Compared with the existing technology, this scheme reduces the number of datums and processes, reduces the frequency of datum conversion, reduces the error accumulation caused by datum conversion, improves machining efficiency and accuracy, has strong practicality, and is suitable for wide promotion and application.

[0025] It should be understood that the dimensional chain analysis method is a well-known technique to those skilled in the art, and therefore will not be described in detail.

[0026] In this embodiment, step S1 specifically includes the following steps: analyzing the reference datum surfaces of all processing dimensions of the casing, listing the number of processing accuracy requirements corresponding to each datum surface in sequence, sorting the datum surfaces in descending order from front to back according to the number of processing accuracy requirements, classifying the first 20% of the datum surfaces as the first datum surfaces, classifying the first 20%-50% of the datum surfaces as the second datum surfaces, and classifying the last 50% of the datum surfaces as the third datum surfaces, and then processing the first datum surface, the second datum surface, and the third datum surface in sequence.

[0027] Specifically, the datum surfaces are classified according to the number of machining accuracy requirements, and the top 20% of the datum surfaces with the highest machining accuracy requirements are classified as the first datum surfaces, so that the first datum surfaces include the datum surfaces with the most stringent, most critical and most sensitive accuracy requirements in the machining process, and the first datum surface, the second datum surface and the third datum surface are machined in sequence to ensure that the first datum surface can be machined first during the machining process. In the actual machining process, the first datum surface has the greatest impact on the overall machining accuracy and clamping stability. After the first datum surface is machined first, it is beneficial to ensure the positional relationship and accuracy transfer in the subsequent machining process, and can minimize the subsequent machining process caused by datum conversion. The error accumulation caused by the subsequent datum surface processing often depends on the position and shape accuracy of the previous datum surface, which can avoid the error accumulation caused by the datum surface with lower precision requirements being processed first, and the subsequent low-precision datum surface can also be processed with the help of the stable position of the high-precision datum surface, thereby improving the geometric accuracy and position accuracy of the overall workpiece; the second datum surface is a surface closely related to the first datum surface. By processing it immediately after the first datum surface, the processing accuracy and stability are guaranteed at the same time, and the accumulation of processing errors caused by improper datum order is avoided. The third datum surface usually includes surfaces with lower precision requirements, which can be processed later and will not have a significant impact on the processing accuracy of the first and second datum surfaces.

[0028] It should be understood that the number of machining accuracy requirements corresponding to each reference surface refers to the number of machining dimensions with the reference surface as a reference for machining accuracy.

[0029] In this embodiment, in step S4, the processing principles include Principle 1, Principle 2, and Principle 3. Principle 1 sequentially processes the processing dimensions of the reference first reference plane, the reference second reference plane, and the reference third reference plane. Principle 2 precedes milling and then drilling, and during milling, face milling is performed first and then side milling. Principle 3 processes the area of ​​the processing area first, then smaller. The priority of determining the processing sequence according to Principle 1, Principle 2, and Principle 3 decreases in descending order. Specifically, determining the processing sequence through the above processing principles achieves reasonable classification and integration of processes, allowing each process to be efficiently and accurately connected, reducing unnecessary processes and processing steps, and greatly improving processing efficiency.

[0030] Optionally, the processing principles also include principle four, which is to use small-sized tools to complete all processing of the same type. For example, when a large-sized milling cutter can be selected to process the large end face and a small-sized milling cutter can be selected to process the small end face, based on principle four, a small-sized milling cutter should be selected to complete the processing of the large end face and the small end face in turn to ensure processing accuracy and reduce the number of clamping times.

[0031] In this embodiment, adjusting the original processing accuracy specifically includes the following steps: improving the processing accuracy of the reference original reference plane of the processing size to determine whether the processing accuracy after the processing size conversion reference meets the design requirements; if it meets the design requirements, it is executed according to the adjusted processing accuracy; if it does not meet the design requirements, the adjusted processing accuracy is adjusted again until the processing accuracy after the processing size conversion reference meets the design requirements.

[0032] Specifically, by adjusting and optimizing the processing accuracy after the processing size conversion benchmark, precise control of the relative benchmark conversion accuracy is achieved, ensuring that each link in the processing process can minimize error accumulation, thereby ensuring high precision and high stability of the casing processing.

[0033] In this embodiment, the following specific steps are used to convert the processing accuracy of the screened processing dimensions with reference to the original reference plane into the processing accuracy with reference to the first reference plane: construct a dimension chain model for converting the original reference plane into the first reference plane, determine the tolerance of each link in the dimension chain model to calculate the tolerance accumulation after the reference conversion, then identify the geometric relationship between the original reference plane and the first reference plane, and construct a geometric error model to quantify the geometric error between the original reference plane and the first reference plane, and then correct the tolerance accumulation through the geometric error, and finally obtain the processing accuracy of the processing dimensions with reference to the first reference plane through the processing accuracy of the processing dimensions with reference to the original reference plane and the corrected tolerance accumulation. Specifically, the above steps achieve accurate calculation of the processing accuracy after the conversion of the processing dimension reference, which is conducive to judging whether the processing accuracy of the processing dimension after the conversion of the reference meets the design requirements, thereby facilitating adjustment of the processing accuracy.

[0034] In this embodiment, in step S1, after the first datum surface is machined, the second and third datum surfaces are machined sequentially using the first datum surface as the clamping surface. Specifically, because the first datum surface requires high machining accuracy, by using the first datum surface as the clamping surface and sequentially machining the second and third datum surfaces, the high accuracy of the first datum surface can be used to ensure the machining accuracy of the second and third datum surfaces, thereby reducing the error accumulation caused by datum conversion and effectively reducing error transmission in subsequent machining processes.

[0035] In this embodiment, the first datum surface also includes a large-scale continuous end surface and a clamping deformation-sensitive surface. Specifically, by classifying the large-scale continuous end surface as the first datum surface, which often determines the core geometric structure of the receiver, and prioritizing the processing of the first datum surface, using it as the first datum surface can ensure guaranteed machining accuracy in the initial stage of machining, thereby improving the efficiency and accuracy of the entire machining process. By classifying the clamping deformation-sensitive surface as the first datum surface, prioritizing the processing of the first datum surface, and using it as the first datum surface, the number of clamping times can be reduced, reducing errors caused by frequent clamping, and effectively avoiding deformation caused by unstable clamping during subsequent machining.

[0036] It should be understood that the clamping deformation sensitive surface refers to a surface that will deform by at least 20 μm when subjected to a pressure of 50 N.

[0037] In this embodiment, the machining requirements for the first reference surface are: flatness less than 5 μm, surface roughness less than 0.4, and a clamping area hardness of no less than 45 HRC. Specifically, these flatness and surface roughness requirements ensure the machining accuracy of the first reference surface, thereby facilitating the geometric accuracy of subsequent machining. Furthermore, ensuring a clamping area hardness of no less than 45 HRC prevents deformation during machining.

[0038] In this embodiment, the machining requirements for the second reference surface are: flatness less than 8 μm, surface roughness less than 0.8, and a clamping area hardness of no less than 40 HRC. Specifically, these flatness and surface roughness requirements ensure the accurate relative position of the second reference surface and the first reference surface, while a clamping area hardness of no less than 40 HRC minimizes deformation during machining.

[0039] In this embodiment, the machining requirements for the third reference surface are: flatness less than 10 μm, surface roughness less than 1, and a clamping area hardness of no less than 30 HRC. Specifically, these flatness and surface roughness requirements ensure that the relative relationship between the third reference surface and the first two reference surfaces is not affected. Furthermore, by ensuring a clamping area hardness of no less than 30 HRC, clamping deformation during machining is reduced.

[0040] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0041] Unless otherwise defined, technical or scientific terms used in this application should have the ordinary meanings understood by persons of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar expressions used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one.

[0042] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0043] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of this application to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. A unified benchmark and integrated process method for high-precision and high-efficiency machining of casings, characterized in that: The following steps are involved: S1: Classify the reference surfaces into the first reference surface, the second reference surface, and the third reference surface according to the number of machining accuracy requirements corresponding to each reference surface on the receiver, and then process the first reference surface, the second reference surface, and the third reference surface in sequence; S2: screening out machining dimensions that can be linked to the first datum plane through geometric operations with reference to the reference plane, and converting the machining accuracy of the screened machining dimensions with reference to the original datum plane into the machining accuracy with reference to the first datum plane; S3: Use the dimension chain analysis method to evaluate the machining accuracy after the machining dimension conversion benchmark to determine whether the machining accuracy after the machining dimension conversion benchmark meets the design requirements. If it meets the design requirements, it will be executed according to the original machining accuracy. If it does not meet the design requirements, the original machining accuracy will be adjusted; S4: The processing principles are given based on the reference datum plane of the processing size, the processing technology and the processing area to determine the processing sequence of the processing size.

2. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to claim 1 is characterized in that: Step S1 specifically includes the following steps: Analyze the reference datum surfaces of all processing dimensions of the receiver, list the number of processing accuracy requirements corresponding to each datum surface in turn, sort the datum surfaces in descending order from front to back according to the number of processing accuracy requirements, classify the first 20% of the datum surfaces as the first datum surface, classify the first 20%-50% of the datum surfaces as the second datum surface, and classify the last 50% of the datum surfaces as the third datum surface, and then process the first datum surface, the second datum surface and the third datum surface in sequence.

3. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to claim 1 is characterized in that: In step S4, the processing principles include principle one, principle two and principle three. Principle one is to process the processing dimensions of the reference first reference plane, the reference second reference plane and the reference third reference plane in sequence. Principle two is to mill first and then drill, and when milling, face milling is performed first and then side milling. Principle three is to process the area of ​​the processing area first and then smaller. The priority of the processing order determined by principles one, two and three decreases in sequence.

4. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to claim 1 is characterized in that: Adjusting the original processing accuracy specifically includes the following steps: Improve the machining accuracy of the original reference surface of the machining dimension to determine whether the machining accuracy after the machining dimension conversion datum meets the design requirements. If it meets the design requirements, execute it according to the adjusted machining accuracy. If it does not meet the design requirements, adjust the adjusted machining accuracy again until the machining accuracy after the machining dimension conversion datum meets the design requirements.

5. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to claim 1 is characterized in that: The specific steps for converting the processing accuracy of the filtered processing dimensions with reference to the original reference plane into the processing accuracy with reference to the first reference plane are as follows: A dimension chain model is constructed by converting the original datum plane into the first datum plane, and the tolerance of each link in the dimension chain model is determined to calculate the tolerance accumulation after the datum conversion. The geometric relationship between the original datum plane and the first datum plane is then identified to construct a geometric error model to quantify the geometric error between the original datum plane and the first datum plane. The tolerance accumulation is then corrected by the geometric error. Finally, the machining accuracy of the machining dimension with reference to the first datum plane is obtained by calculating the machining accuracy of the machining dimension with reference to the original datum plane and the corrected tolerance accumulation.

6. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to any one of claims 1 to 5, characterized in that: In step S1 , after the first reference surface is machined, the second reference surface and the third reference surface are machined in sequence using the first reference surface as the clamping surface.

7. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to any one of claims 1 to 5, characterized in that: The first reference surface also includes a large-size continuous end surface and a clamping deformation sensitive surface.

8. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to any one of claims 1 to 5, characterized in that: The processing requirements for the first reference surface are: The flatness is less than 5um, the surface roughness is less than 0.4, and the hardness of the clamping area is not less than 45HRC.

9. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to any one of claims 1 to 5, characterized in that: The processing requirements for the second reference surface are: The flatness is less than 8um, the surface roughness is less than 0.8, and the hardness of the clamping area is not less than 40HRC.

10. The unified benchmark and integrated process method for high-precision and high-efficiency casing processing according to any one of claims 1 to 5, characterized in that: The processing requirements for the third reference surface are: The flatness is less than 10um, the surface roughness is less than 1, and the hardness of the clamping area is not less than 30HRC.

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