1 Overview <br> <br> study of this system mainly refers to a variety of accessories aviation hydraulic auxiliary power unit, is an important part of aviation equipment. Such products require performance in the direction of high pressure, large flow, high speed and high volumetric efficiency. Therefore, the parts are required to be miniaturized in structure, and high reliability is required in terms of quality.
In aviation hydraulic accessories, each component is characterized by its small size and high precision, and it is subject to complex service conditions during work. Therefore, in terms of material selection and determination of heat treatment requirements, it should be ensured that it has high strength, good toughness, high wear resistance and dimensional stability. The heat treatment process mainly has the following characteristics:
(1) A large number of aerospace structural steels are treated with quenching and tempering to obtain high fatigue resistance;
(2) Widely apply isothermal ocean fire to obtain good comprehensive mechanical properties, and should minimize ocean fire distortion;
(3) In order to obtain high wear resistance and fatigue resistance, chemical heat treatment such as carburizing and nitriding is widely used;
(4) In order to meet the requirements of high temperature oxidation resistance and corrosion resistance, metal infiltration (such as aluminizing, siliconizing, etc.) is adopted;
(5) Aerospace martensitic stainless steel is treated with "foreign fire + tempering".
This system takes the materials of aviation aerospace accessories and its heat treatment as the research direction. On the platform of Windows XP, Visual Basic 6.0, Access 2002 and Volo View are used as development tools, and the modular design is adopted to make aviation metal materials and heat treatment parameters. The database and the process specification database are connected in a unified whole. Design and manage computer-aided processes for heat treatment such as ocean fire, tempering, carburizing and nitriding.
2 System functions and main technical indicators 2.1 System function research for the aviation hydraulic accessories heat treatment CAPP system has two major functions: heat treatment process design and heat treatment process management.
2.1.1 Heat Treatment Process Design The system is designed with four heat treatment process modes:
·Shot + tempering · Spitfire + cold treatment + tempering · Carburizing + high temperature tempering · Nitriding treatment, the user first needs to transfer the process drawings of the heat-treated parts, input the basic information of the parts, select the material grade, The type of process and the requirements of the heat treatment technology, then the system automatically makes the process decision, and connects to the corresponding database, and finally generates the output process specification. Its main contents are: parts schematic, basic information of parts, process parameters, heat treatment technical requirements, and acceptance and inspection items.
(1) Schematic diagram of the parts: This system can directly transfer the parts and parts drawings provided by the cold process and drawn by AutoCAD.
(2) Basic information of heat-treated parts: including part number, part name, product type, process version, process page number, commissioned processing unit and process number.
(3) Selection of material grades and heat treatment types: The applicable materials of this system are common aerospace metal materials such as aerospace structural steel, spring steel, rolling bearing steel, martensitic stainless steel, carburized steel and nitrided steel, and their corresponding The type of heat treatment is shown in Figure 1.
Figure 1 Relationship between materials and heat treatment types
(4) Heat treatment technical requirements: In this system, the user's heat treatment technical requirements for parts include: hardness, carburizing or nitriding layer effective depth, and other inspection items, hardness tester type and ratio of inspection hardness.
According to the technical requirements and other information selected by the user, the system can automatically connect the heat treatment parameter database and use the corresponding decision-making method to directly generate the technical procedures.
2.1.2 Heat Treatment Process Management The process management functions of this system include: query, modify, save and print.
(1) Query: The user needs to input the part number and the process specification page code, and the system automatically retrieves the corresponding technical procedure from the process specification database and displays it on the computer screen.
(2) Modification: If the designed process specification needs to be modified, the user can modify the relevant parameters in the process specification according to the authority to ensure the correctness of the heat treatment process specification.
(3) Preservation: After the process specification is confirmed, the system will automatically update the process specification database for subsequent inquiry and printing.
(4) Printing: After the process specification is designed or modified and saved, it can be directly output to the printer to print out the heat treatment process card with pictures and texts.
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