Method for estimating whole-process manufacturing cost of aeronautical part

Abstract

The invention relates to a whole-process manufacturing cost estimation method for aeronautical parts, which comprises the following steps of: establishing a process parameter library through an SQLite database platform, performing database management through an Oracle server, covering process parameters of whole-process price estimation of the aeronautical parts, and calculating the whole-process manufacturing cost of the aeronautical parts according to the process parameters of the whole-process manufacturing cost of the aeronautical parts. Comprising a material parameter library, an equipment cutter parameter library, a feature definition parameter library, a special manufacturing parameter library and an other-class parameter library, a cost estimation process based on the whole aeronautical part manufacturing process is constructed, the cost estimation process comprises material cost estimation, numerical control milling cost estimation, special manufacturing cost estimation and other cost estimation, and a cost database is established through a server. In conclusion, according to the aeronautical part cost estimation method, the process of replacing manual calculation with machine calculation for aeronautical part cost estimation is achieved, the aeronautical part cost estimation process is more accurate and efficient, whole-process cost element recognition is achieved, and the cost estimation process is more comprehensive and rigorous.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation parts processing and manufacturing, and in particular relates to a method for estimating the full-process manufacturing cost of aviation parts. Background Art

[0002] Faced with increasingly fierce market competition, companies are paying more and more attention to controlling product costs. Parts manufacturing costs run through the entire life cycle of the product and account for a large proportion of the cost structure. How to improve product competitiveness by reducing product costs has become a core element.

[0003] At present, in the manufacturing process of aviation parts, the cost estimation methods are mainly calculation method and comparison method. The calculation method is mainly based on the whole process cycle of parts manufacturing, including material preparation, machining, heat treatment, surface treatment, etc. When the technicians estimate the cost of parts by calculation method, they need to estimate the cost of each manufacturing process and accumulate the cost of the whole process of the parts. The comparison method is to compare existing similar parts (structural features, materials and other elements) to obtain the estimated cost of the target parts by comparison. However, both the calculation method and the comparison method have certain limitations. The calculation method is based on the whole process route of aviation parts manufacturing, and the estimation process is more complicated, with large amount of calculation, long calculation cycle, high labor cost, and certain requirements on the technical level and experience of the technicians. The comparison method requires the technicians to have rich manufacturing experience and the ability to identify the typical characteristics of aviation parts. The estimation process is more difficult, and the above two methods require the process technicians to complete the estimation independently, and it is impossible to realize the sharing of the estimated aviation parts cost information data, and other technicians such as designers cannot complete the estimation process.

[0004] Therefore, there is an urgent need for a full-process manufacturing cost estimation method for aviation parts, which can efficiently and accurately complete the full-process manufacturing cost estimation of aviation parts and solve the problems existing in the existing calculation method and comparison method in actual use. Summary of the invention

[0005] In view of this, the present invention proposes a method for estimating the manufacturing cost of aviation parts throughout the entire process, which is applied to the technical field of aviation parts processing and manufacturing. By identifying the 3D design model, the geometric properties, material properties, dimensional tolerances, surface treatment and other features of the CAD model are extracted. At the same time, the feature recognition capability is combined to identify typical features such as hole features and slot features of aviation parts. The cost of aviation parts is calculated by combining the manufacturing capability and cost calculation data, and the cost generation is basically achieved with "one click". The method can solve the technical problems of existing manufacturing cost estimation methods, such as large amount of calculation, long calculation cycle, high labor cost and great estimation difficulty.

[0006] In order to achieve the above technical objectives, the specific technical solutions adopted by the present invention are:

[0007] A method for estimating the full-process manufacturing cost of aviation parts comprises the following steps:

[0008] S1. Establish a process parameter library through the SQLite database platform, and manage the database with Oracle server, covering the process parameters for price estimation of all processes of aviation parts, including material parameter library, equipment tool parameter library, feature definition parameter library, special manufacturing parameter library and other parameter libraries. The process parameter library is divided into process scheme parameters and attribute parameters according to different functions. The process scheme parameters are used to support the formulation of process schemes, and the attribute parameters are read to participate in price calculation;

[0009] S2. Construct a cost estimation process based on the entire manufacturing process of aviation parts, including material cost estimation, CNC milling cost estimation, special manufacturing cost estimation and other cost estimation;

[0010] S3. Establish a cost database through the server, and divide the cost database into typical features and cost components. The typical features are derived from the elements combining the part structure and the manufacturing process, and the cost components are derived from the elements read and identified in the part cost accounting process;

[0011] S4. Rapidly compare and evaluate the manufacturing costs of similar parts by searching the database.

[0012] Further, in step S1, the material parameter library includes material name, specification, density, unit price and clamping scheme determination parameters, the clamping scheme determination parameters are process scheme parameters, the equipment parameter library includes machine tool equipment parameters, tool selection scheme parameters, cutting parameters and equipment unit price parameters, the tool selection scheme and cutting parameters, and equipment parameters are process scheme parameters, the feature definition parameters include tenon features, microchannel features, and high-precision step hole features, and the feature definition parameters are all process scheme parameters, the special manufacturing parameter library includes surface treatment categories and price parameters, welding categories and price parameters, heat treatment and price parameters, surface treatment categories and price parameters, welding categories and price parameters, heat treatment and price parameters are all attribute parameters, and other types of parameter libraries include general manufacturing categories and unit price parameters, and analogies and unit price parameters of auxiliary materials.

[0013] Furthermore, in step S2, material cost estimation involves material type, blank type and clamping method, which together determine the setting of blank allowance. The material type is obtained by reading the material properties of the three-dimensional MBD model, identifying the structural features of the parts, and determining the clamping method, which is jointly determined by the structural features and the clamping scheme determination parameters of the process parameter library.

[0014] Furthermore, in step S2, the material blank size is calculated according to the material type, blank type and clamping method. The material cost estimation method for non-rotating parts is: 非回转=X×Y×Z×ρ×k; The material cost estimation method for rotating parts is: P 回转 =π×r2×h×ρ×k; where P 非回转 For non-rotating parts material estimation, P 回转 To estimate the cost of rotating parts materials, X, Y, and Z are the length, width, and height dimensions of the non-rotating parts material blanks. r and h are the radius and length dimensions of the rotating parts material blanks, which are determined by the process plan parameters. ρ is the material density and k is the unit price of the material, which is read in the attribute parameters.

[0015] Further, in step S2, the CNC milling manufacturing cost estimation is to plan the milling plan and tool selection according to the part structure characteristics and process plan parameters, obtain the roughing time and finishing time, and then calculate the roughing cost and finishing cost. The roughing and finishing cost calculation method is: The calculation method is P 粗 / 精加工成本 =T 粗 / 精加工工时 ×D machine 床设备参数 Among them, D 机床设备参数 is the price parameter of machine tool equipment, T 粗 / 精加工工时 It is the rough / finish machining time of the part. The evaluation is mainly carried out by estimating the time of part material removal through feature recognition.

[0016] Furthermore, in step S2, the special processing cost estimation is divided into three categories: surface treatment cost estimation, heat treatment cost estimation and welding cost estimation; surface treatment is divided into conventional type, plating type and spraying type, and the surface treatment price estimation method is as follows: Where P 表面处理成本 is the total cost of surface treatment, n is the number of surface treatment methods for parts; S 表处n面积 is the processing area of ​​the i-th surface treatment method of the part; P 表处n单价 is the unit price of the i-th surface treatment; S 表处i保护 is the protection area of ​​the i-th surface treatment; P 表处i保护单价 S is the unit price of the i-th surface treatment protection. 表处i面积 and S表处i保护 Through the reading of attributes and annotations, the category of surface treatment method and surface treatment unit price of surface treatment i in the i-th table are read and maintained in the process parameter library; the heat treatment cost calculation is based on the quality of the parts manufacturing status, and the calculation method is: P 热处理成本 =G 零件当前状态质量 ×P 热处理单价 , where P 热处理成本 is the heat treatment cost; G 零件当前状态质量 P is the part quality, which is read from the part attributes; 热处理单价The price parameters for heat treatment are read and maintained in the process parameter library. The welding cost is determined by selecting the welding method to develop a welding cost evaluation formula system, selecting a reasonable welding method, generating a text box for the welding method cost composition parameters, inputting welding characteristic parameters, generating the cost price, and maintaining the unit basic price related parameters involved in the cost estimation process, which are read and maintained in the process parameter library.

[0017] Furthermore, in step S2, other cost estimates include cost estimates of common manufacturing methods such as turning, clamping, grinding, and engraving, as well as auxiliary material costs and management costs. The calculation method is P 其他成本 =P 普通制造成 Ben+P 管理成本 +P 辅料成本 Among them, P 普通制造成本 Including benchwork cost, grinding cost, engraving cost, and lathe cost. The cost calculation method is based on the estimated working hours and the unit price of ordinary manufacturing processes. 管理成本 It is the management cost of the whole process cost accounting of the parts, which is calculated as a certain percentage of the total cost; P 辅料成本 The cost of auxiliary materials for aviation parts manufacturing, including wire thread inserts and process equipment, is maintained in the process parameter library. The cost calculation of process equipment can be directly written as required.

[0018] Furthermore, in step S3, typical features of parts include typical structural features including microfluidics and high-precision step holes, typical manufacturing features including deep hole drilling and vacuum welding, typical value features including high-value parts and gold-plated parts, and typical usage category features including bases and chassis cold plates.

[0019] Furthermore, in step S3, the cost components including drawing number, name, material grade, maximum shape, surface treatment method, heat treatment method, welding method and workpiece removal rate are directly read and written into the database during the cost estimation process without the need for separate identification by technical personnel.

[0020] Furthermore, in step S4, the retrieval process of the cost database is to retrieve the target parts through typical features and combine them with table screening, so as to quickly achieve comparative evaluation of the manufacturing costs of similar parts.

[0021] By adopting the above technical solution, the present invention can also bring the following beneficial effects:

[0022] 1. The present invention mentions a method for estimating the manufacturing cost of aviation parts throughout the entire process. By identifying the 3D design model, the geometric properties, material properties, dimensional tolerances, surface treatment and other features of the CAD model are extracted. At the same time, the hole features, groove features and other typical features of aviation parts are identified in combination with feature recognition capabilities. The cost of aviation parts is calculated in combination with manufacturing capabilities and cost calculation data, and the cost is basically generated with "one click". The comparative cost estimation prototype is based on the calculation method estimation architecture, and the key elements constituting the cost information of aviation parts are stored in the server to build a cost database. All designated technicians access and retrieve the part cost elements stored in the server through the server to quickly realize comparative evaluation of similar parts, which has the advantages of low cost, fast calculation speed and low personnel requirements.

[0023] 2. The present invention mentions a method for estimating the manufacturing cost of aviation parts throughout the entire process, which realizes the process of replacing manual calculation with machine calculation for aviation parts cost estimation, making the aviation parts cost estimation process more accurate and efficient, formulating a complete parts cost evaluation method, realizing the identification of cost elements throughout the entire process, making the cost estimation process more comprehensive and rigorous, and the construction and maintainability of a process parameter library ensure that the parts cost estimation parameters can be uniformly managed, and maintenance personnel can uniformly maintain parameters according to market changes, thereby ensuring the advancement of the system. Technical personnel can share cost information of various parts through the parts cost database system, achieving the goal of reducing costs and increasing efficiency, as well as controlling and reducing the manufacturing costs of outsourced parts. It is widely used in economic evaluation at the part structure design stage, can timely feedback part cost structure information and make structural improvements, and has very obvious advantages. It can also be used for part outsourcing price evaluation and complete cost control at the part procurement stage, and has great room for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A system scheme configuration diagram of a method for estimating the full-process manufacturing cost of aviation parts in the present invention;

[0026] Figure 2 It is a configuration diagram of the process parameter library in a specific embodiment of the present invention;

[0027] Figure 3 It is a flowchart for realizing the cost estimation of the whole process in a specific implementation mode of the present invention;

[0028] Figure 4This is a configuration diagram of the cost database in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0031] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0034] In one embodiment of the present invention, Figures 1 to 4 As shown, the present invention provides a method for estimating the full-process manufacturing cost of aviation parts, comprising the following steps:

[0035] Step S1: Build a process parameter library:

[0036] The process parameter library is built through the SQLite platform, and the parameters are uniformly managed and issued through the Oracle database.

[0037] The process parameter library is divided into material parameter library, equipment parameter library, feature definition parameter library, special manufacturing parameter library and other parameter libraries according to different cost structures. Each parameter library is divided into process scheme parameters and attribute parameters according to different functions. The process scheme parameters are used to support the formulation of process schemes. Different process schemes are formulated by reading parameters, which are important parameters for process flow formulation; attribute parameters can be directly read to participate in price calculation. The following is an analysis of the material parameter library, equipment parameter library, special manufacturing parameter library and other parameter libraries, focusing on exemplifying the process scheme parameters.

[0038] Material parameter library. The parameter library contains material name, specification, density, unit price and clamping scheme determination parameters. Among them, the clamping scheme determination parameters are process scheme parameters. In this example:

[0039] The type of a part is determined based on the read part shape. If it is a non-rotating part F1, the clamping scheme is platen clamping, and the blank allowance is set to M by default. a ; If it is a rotating part F2, the clamping scheme is three-jaw clamping, and the blank allowance is set to M by default. b Among them, F1, F2, M a 、M b , platen clamping, and three-claw clamping are all parameter factors for determining the clamping scheme. Material name, specification, density, and unit price are attribute parameters and participate in the material price estimation as direct components.

[0040] Equipment parameter library. The equipment parameter library contains machine tool equipment parameters, tool selection scheme parameters, cutting parameters, and equipment unit price parameters. Among them, tool selection scheme and cutting parameters, equipment parameters are process scheme parameters, which determine tool selection and equipment selection, and are important bases for man-hour determination and price estimation.

[0041] Machine tool equipment parameters in this example:

[0042] The size of a part is non-rotating, and the maximum dimensions are X and Y. If X>X max or Y>Y max If large CNC equipment is selected for processing, its attribute parameters are called according to large CNC equipment; otherwise, ordinary CNC equipment is selected for processing, and its attributes are called according to ordinary CNC equipment. max , Y max , large CNC equipment, and ordinary CNC equipment are machine tool equipment parameter factors.

[0043] Tool selection and cutting parameters in this example:

[0044] The size of a part is non-rotating, and the maximum dimensions are X and Y, where X < Y. The rough machining tool selection scheme is: determine if X n <X<X m , Y k <Y<Y j , then the rough machining tool specification is D a and D b Otherwise, the next step of cumulative judgment is carried out until a rough machining tool that meets the conditions is selected and the rough machining tool D is called. a and D b Attribute parameters of n , X m , Y k , Y j , D a , D b Parameter factors for tool selection scheme.

[0045] Feature definition parameters. Contains definition parameters for tenon features, microchannel features, and high-precision step hole features. These parameters are process solution parameters that determine the manufacturing process flow of typical features. This embodiment focuses on tenon features: If a feature is a cylindrical feature with a diameter of D and a length of L, and D≤D S , determine if If the number of cylinders with the same characteristics (D and L are the same) is greater than m, it is defined as a tenon, and the tenon processing tool D is selected. t , and call D t Attribute parameters. Among them, D S , k, m, D t is the tenon characteristic parameter factor.

[0046] Special manufacturing parameter library. The special manufacturing parameter library includes surface treatment categories and price parameters, welding categories and price parameters, heat treatment and price parameters. Surface treatment categories and price parameters, welding categories and price parameters, heat treatment and price parameters are all attribute parameters, and the parameters can be directly obtained through part attributes for price estimation.

[0047] Other parameter libraries. Mainly include common manufacturing categories and unit price parameters, auxiliary material analogies and unit price parameters, etc. After feature recognition, the corresponding manufacturing hours and auxiliary material costs are obtained, and the manufacturing cost is output.

[0048] Step S2: Cost estimation of the entire process and output

[0049] This step includes the cost estimation of the whole manufacturing process of the parts, which is mainly divided into three categories: material cost estimation, milling cost estimation, special cost estimation and other cost estimation. The details are as follows:

[0050] 1) Material cost estimation:

[0051] The part material cost estimation involves the material type, blank type and clamping method, which together determine the setting of blank allowance. The determination plan is as follows:

[0052] a. The material type is obtained by reading the material properties of the 3D MBD model and identifying the structural features of the part;

[0053] b. Determine the clamping method, which is determined by the structural characteristics and the parameters of the clamping scheme in the process parameter library;

[0054] c. Determine the size of the material blank.

[0055] After the above parameters are set, the system can automatically calculate and confirm the blank size of the part. In this example, 3DDFC is used to calculate the blank size of the part. The material cost estimation method for non-rotating parts is: 非回转 =X×Y×Z×ρ×k; The material cost estimation method for rotary parts is: Protation=π×r 2 ×h×ρ×k; where P 非回转 For non-rotating parts material estimation, P 回转 Estimate the cost of rotating parts materials. X, Y, and Z are the length, width, and height dimensions of the non-rotating parts material blank, r and h are the radius and length dimensions of the rotating parts material blank, which are determined by the process plan parameters; ρ is the material density, and k is the unit price of the material, which is read in the attribute parameters.

[0056] 2) CNC milling cost estimation:

[0057] The CNC milling manufacturing cost estimation is related to the CNC milling time of the part. According to the structural characteristics of the part and the process parameters, the milling plan and tool selection planning are carried out to obtain the roughing time and finishing time, and finally the roughing cost and finishing cost are calculated. The roughing and finishing cost calculation method is: The calculation method is P 粗 / 精加工成本 =T 粗 / 精加工工时 ×D 机床设备参数 Among them, D 机床设备参数 is the price parameter of machine tool equipment, T 粗 / 精加工工时 It is the roughing / finishing time of parts. The assessment is mainly carried out by estimating the time of material removal of parts through feature recognition, and the process mainly includes roughing and finishing.

[0058] 3) Special manufacturing cost estimation:

[0059] The special processing cost methods of aviation parts involved in the present invention are divided into three categories: surface treatment cost, heat treatment cost and welding cost.

[0060] Surface treatment: Surface treatment is divided into conventional, plating and spraying. The surface treatment price estimation method is as follows: Where P 表面处理成本is the total cost of surface treatment, n is the number of surface treatment methods for parts; S 表处n面积 is the processing area of ​​the i-th surface treatment method of the part; P 表处n单价 is the unit price of the i-th surface treatment; S 表处i保 P is the protection area of ​​the ith surface treatment; 表处i保护单价 S is the unit price of the i-th surface treatment protection. 表处i面积 With S 表处i保护 Read through attributes and annotations. The type of surface treatment method and surface treatment unit price of surface treatment i are read and maintained in the process parameter library.

[0061] Heat treatment: The heat treatment price estimate is mainly related to the quality of the parts in their manufacturing state. The calculation method is:

[0062] P 热处理成本 =G 零件当前状态质量 ×P 热处理单价 , where P 热处理成本 is the heat treatment cost; G 零件当前状态质量 is the part mass, which is read from the part attributes; P 热处理单价 It is the heat treatment price parameter, which is read and maintained in the process parameter library.

[0063] Welding: Different welding methods involve different features and methods for cost estimation. The present invention formulates a welding cost evaluation formula system by selecting the welding method. The specific implementation method is: select a reasonable welding method, generate a welding method cost composition parameter text box, input welding characteristic parameters, and generate a cost price. The unit base price related parameters involved in the cost estimation process are maintained and read and maintained in the process parameter library.

[0064] 4) Other costs:

[0065] Other costs include the cost estimates of common manufacturing methods such as turning, clamping, grinding, engraving, and auxiliary material costs and management costs. The calculation method is P 其他成本 =P 普通制造成本 +P 管理成本 +P 辅料成本 Among them, P 普通制造成本 Including benchwork cost, grinding cost, engraving cost, and lathe cost. The cost calculation method is based on the estimated working hours and the unit price of ordinary manufacturing processes. 管理成本 It is the management cost of the whole process cost accounting of the parts, which is calculated as a certain percentage of the total cost; P 辅料成本 The cost of auxiliary materials for aviation parts manufacturing, including wire thread inserts and process equipment, is maintained in the process parameter library. The cost calculation of process equipment can be directly written as required.

[0066] Step S3: Build cost database

[0067] The cost database is stored in the Oracle database and is used to read and write data distribution data content. The database is mainly divided into two categories: typical characteristics and cost components, configuration reference Figure 4 .

[0068] The typical characteristics of parts combine the elements of part structure and manufacturing process, such as typical structural characteristics such as microfluidics and high-precision step holes, typical manufacturing characteristics such as deep hole drilling and vacuum welding, typical value characteristics such as high-value parts and gold-plated parts, and typical usage category characteristics such as bases and chassis cold plates.

[0069] The cost components are derived from the reading of the part cost accounting process attributes and the basic structural elements, including drawing number, name, material grade, maximum shape, surface treatment method, heat treatment method, welding method and workpiece removal rate. They are directly read and written into the database during the cost estimation process, without the need for technicians to identify them separately.

[0070] Step S4: Retrieval process of cost database: Retrieve target parts through typical features, and screen them in combination with the table method to quickly realize the comparative evaluation of manufacturing costs of similar parts.

[0071] In short, the present invention realizes the process of replacing manual calculation with machine calculation for aviation parts cost estimation, making the aviation parts cost estimation process more accurate and efficient, realizing the identification of cost elements of the entire process, making the cost estimation process more comprehensive and rigorous, and enabling maintenance personnel to unify maintenance parameters according to market changes, thereby ensuring the advancement of the system.

[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for estimating the manufacturing cost of aviation parts in the entire process, characterized in that: The following steps are involved: S1. Establish a process parameter library through the SQLite database platform, and manage the database with Oracle server, covering the process parameters for price estimation of all processes of aviation parts, including material parameter library, equipment tool parameter library, feature definition parameter library, special manufacturing parameter library and other parameter libraries. The process parameter library is divided into process scheme parameters and attribute parameters according to different functions. The process scheme parameters are used to support the formulation of process schemes, and the attribute parameters are read to participate in price calculation; S2. Construct a cost estimation process based on the entire manufacturing process of aviation parts, including material cost estimation, CNC milling cost estimation, special manufacturing cost estimation and other cost estimation; S3. Establish a cost database through the server, and divide the cost database into typical features and cost components. The typical features are derived from the elements combining the part structure and the manufacturing process, and the cost components are derived from the elements read and identified in the part cost accounting process; S4. Rapidly compare and evaluate the manufacturing costs of similar parts by searching the database.

2. The method for estimating the full-process manufacturing cost of aviation parts according to claim 1, characterized in that: In the step S1, the material parameter library includes material name, specification, density, unit price and clamping scheme determination parameters, the clamping scheme determination parameters are process scheme parameters, the equipment parameter library includes machine tool equipment parameters, tool selection scheme parameters, cutting parameters and equipment unit price parameters, the tool selection scheme and cutting parameters, and equipment parameters are process scheme parameters, the feature definition parameters include tenon features, microchannel features, and high-precision step hole features, and the feature definition parameters are all process scheme parameters, the special manufacturing parameter library includes surface treatment categories and price parameters, welding categories and price parameters, heat treatment and price parameters, surface treatment categories and price parameters, welding categories and price parameters, heat treatment and price parameters are all attribute parameters, and other types of parameter libraries include general manufacturing categories and unit price parameters, and auxiliary materials analogy and unit price parameters.

3. The method for estimating the full-process manufacturing cost of aviation parts according to claim 2, characterized in that: In step S2, material cost estimation involves material type, blank type and clamping method, which together determine the setting of blank allowance. The material type is obtained by reading the material properties of the three-dimensional MBD model, identifying the structural features of the parts, and determining the clamping method, which is jointly determined by the structural features and the parameters of the clamping scheme in the process parameter library.

4. The method for estimating the full-process manufacturing cost of aviation parts according to claim 3, characterized in that: In step S2, the material blank size is calculated according to the material type, blank type and clamping method. The material cost estimation method for non-rotating parts is: 非回转 =X×Y×Z×ρ×k; The material cost estimation method for rotating parts is: P 回转 =π×r2×h×ρ×k; where P 非回转 For non-rotating parts material estimation, P 回转 To estimate the cost of rotating parts materials, X, Y, and Z are the length, width, and height dimensions of the non-rotating parts material blanks. r and h are the radius and length dimensions of the rotating parts material blanks, which are determined by the process plan parameters. ρ is the material density and k is the unit price of the material, which is read in the attribute parameters.

5. The method for estimating the full-process manufacturing cost of aviation parts according to claim 4, characterized in that: In step S2, the CNC milling manufacturing cost estimation is carried out according to the part structure characteristics and process plan parameters to plan the milling plan and tool selection, and the roughing time and finishing time are obtained, and then the roughing cost and finishing cost are calculated. The roughing and finishing cost calculation method is: The calculation method is P 粗 / 精加工成本 =T 粗 / 精加工工时 ×D machine 床设备参数 , where D 机床设备参数 is the price parameter of machine tool equipment, T 粗 / 精加工工时 The rough / finishing machining time of the parts is evaluated mainly by estimating the material removal time of the parts through feature recognition.

6. The method for estimating the full-process manufacturing cost of aviation parts according to claim 5, characterized in that: In step S2, the special processing cost estimation is divided into three categories: surface treatment cost estimation, heat treatment cost estimation and welding cost estimation; surface treatment is divided into conventional type, plating type and spraying type, and the surface treatment price estimation method is as follows: Where P 表面处理成本 is the total cost of surface treatment, n is the number of surface treatment methods for parts; S 表处n面积 is the processing area of ​​the i-th surface treatment method of the part; P 表处n单价 is the unit price of the i-th surface treatment; S 表处i保护 is the protection area of ​​the i-th surface treatment; P 表处i保护单价 is the surface treatment protection unit price in the ith level, S 表处i面积 and S表处i保护 Through the reading of attributes and annotations, the type of surface treatment method and surface treatment unit price of surface treatment i in the i-th place are read and maintained in the process parameter library; The heat treatment cost is calculated based on the quality of the parts as manufactured and is calculated as follows: P 热处理成本 =G 零件当前状态质量 ×P 热处理单价 , where P 热处理成本 is the heat treatment cost; G 零件当前状态质量 is the part mass, which is read from the part attributes; P 热处理单价 For heat treatment price parameters, read and maintain them in the process parameter library; The welding cost is evaluated by formulating a welding cost evaluation formula system through the selection of welding methods. A reasonable welding method is selected, a text box for welding method cost composition parameters is generated, welding characteristic parameters are input, and cost prices are generated. The unit basic price related parameters involved in the cost estimation process are maintained and read and maintained in the process parameter library.

7. The method for estimating the full-process manufacturing cost of aviation parts according to claim 6, characterized in that: In step S2, other cost estimates include cost estimates of common manufacturing methods such as turning, clamping, grinding, and engraving, as well as auxiliary material costs and management costs. The calculation method is P 其他成本 =P 普通制造成 Ben+P 管理成本 +P 辅料成本 , where P 普通制造成本 Including benchwork cost, grinding cost, engraving cost, and lathe cost. The cost calculation method is based on the estimated working hours and the unit price of ordinary manufacturing processes. 管理成本 It is the management cost of the whole process cost accounting of the parts, which is calculated as a certain percentage of the total cost; P 辅料成本 The cost of auxiliary materials for aviation parts manufacturing, including wire thread inserts and process equipment, is maintained in the process parameter library. The cost calculation of process equipment can be directly written as required.

8. The method for estimating the full-process manufacturing cost of aviation parts according to claim 7, characterized in that: In step S3, typical features of parts include typical structural features such as microfluidics and high-precision step holes, typical manufacturing features such as deep hole drilling and vacuum welding, typical value features such as high-value parts and gold-plated parts, and typical usage category features such as bases and chassis cold plates.

9. The method for estimating the full-process manufacturing cost of aviation parts according to claim 8, characterized in that: In step S3, the cost components include drawing number, name, material grade, maximum shape, surface treatment method, heat treatment method, welding method and workpiece removal rate, which are directly read and written into the database during the cost estimation process without the need for technical personnel to identify them separately.

10. The method for estimating the full-process manufacturing cost of aviation parts according to claim 9, characterized in that: In step S4, the retrieval process of the cost database is to retrieve the target parts through typical features and combine them with table screening to quickly achieve comparative evaluation of the manufacturing costs of similar parts.

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