Heat treatment CAPP system for aviation hydraulic accessories
The research object of this system, an aviation hydraulic accessory mainly refers to various auxiliary power devices, and is an important part of aviation airborne equipment. This type of product requires performance in the direction of high pressure, high flow, high speed and high volumetric efficiency. Therefore, its parts are required to be compact in structure, and in terms of quality, higher reliability is required.
In aviation hydraulic accessories, the parts are characterized by small size and high precision, and they must undergo complicated service conditions during work. Therefore, in terms of material selection and 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 tempered to obtain high fatigue resistance;
(2) The use of isothermal ocean fire is widely used to obtain good comprehensive mechanical properties, and foreign fire distortion should be minimized;
(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, the metal infiltration (such as aluminizing, siliconizing, etc.) process is adopted;
(5) Martensitic stainless steels for aviation are treated with "ocean-fire + tempering".
This system takes the material of aviation hydraulic accessories and its heat treatment as research direction. On Windows XP platform, Visual Basic 6.0, Access 2002 and Volo View are used as development tools, and modular design is adopted to make aviation metal materials and heat treatment parameters. The database and the process specification database are connected into a unified whole. Computer-aided process design and management for heat treatment of ocean fire, tempering, carburizing, and nitriding.
2 System Functions and Main Technical Specifications
2.1 System Functions
The researched heat treatment CAPP system for aviation hydraulic accessories mainly has two functions: heat treatment process design and heat treatment process management.
2.1.1 Heat Treatment Process Design
The system has designed four heat treatment process modes:
·Tap fire + tempering ·Tang fire + cold treatment + tempering, carburizing + high temperature tempering, nitriding treatment
When using, the user first needs to transfer the process drawings of the heat treatment parts, input the basic information of the parts, select the material number, process type, and heat treatment technical requirements. Then, the system automatically makes process decisions, and connects the corresponding database, and finally generates The output process specification. Its main contents are: parts schematics, basic parts information, process parameters, heat treatment technical requirements, and acceptance and inspection items.
(1) Schematic diagram of the parts: The system can directly transfer drawings of the parts procedures provided by AutoCAD and drawn by AutoCAD.
(2) Basic information of heat-treated parts: Including part number, part name, product type, process version, process page number, entrusted processing unit, and operation number.
(3) Selection of material grades and types of heat treatment: The range of applicable materials for this system is common aerospace metal materials such as aerospace structural steel, spring steel, rolling bearing steel, martensitic stainless steel, carburized steel, and nitrided steel. Heat treatment types are shown in Figure 1.
Fig. 1 Relationship between materials and heat treatment types
(4) Heat treatment technical requirements: In this system, the user's requirements for heat treatment of the parts include: hardness, effective depth of carburizing or nitriding layers, and other inspection items, hardness tester types, and inspection hardness ratios.
Based on the technical requirements and other information selected by the user, the system can automatically connect the heat treatment parameter database and apply the corresponding decision method to directly generate the graphic and textual procedures.
2.1.2 Heat Treatment Process Management
The process management functions of this system include: query, modify, save, and print.
(1) Inquiry: The user needs to input the part number and the process code page number of the inquired part. The system automatically retrieves the corresponding process specification 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) Save: After the process specification is confirmed, the system will automatically update the process specification database for subsequent inquiry and printing.
(4) Printing: After the design or modification of the process specification and preservation, it can be directly output to the printer and the heat treatment process card with the illustrations and drawings printed.
2.2 Main Technical Specifications of the System
(1) The basic process information of the part can be input from the Czech Republic, and drawings of the process can be extracted from the AutoCAD graphic file;
(2) In the "100% WYSIWYG" interface, heat treatment requirements around the part, standard heat treatment process specifications for each part;
(3) Information storage and reuse of the heat treatment process specification;
(4) Support the pre-browsing function before operating on the process specification;
(5) Supports printout of process cards.
3 System Workflow
The system uses a modular design, and its workflow is shown in Figure 2.
Figure 2 System Workflow Diagram
(1) The basic information of heat-treated parts includes: part number, part name, product type, process revision number, process page number, process page number, commissioning unit, and process number.
(2) For quenched and tempered steels, spring steels, martensitic stainless steels, and rolling bearing steels, the fire-failure requirements include: heat treatment hardness, maximum thickness or conditional thickness of the parts, remaining spare parts allowance, fire-fighting tooling, charging capacity, inspection Hardness durometer, check the ratio of hardness and other inspection items.
(3) Requirements for carburizing heat treatment include: acceptance items before carburizing, depth of carburized layer, surface hardness after carburizing, amount of carburized furnace, hardness tester for checking hardness, ratio of inspection hardness, and other inspection items.
(4) Nitriding heat treatment requirements include acceptance items before nitriding, depth of nitriding layer, surface and center hardness, type of nitriding test, hardness tester for checking hardness, proportion of hardness checked, and other inspection items.
4 Conclusion
The heat treatment CAPP system for aviation hydraulic accessories was introduced. The user can use Chinese interface to conveniently complete a series of functions from process design to process management. The adoption of this system can greatly increase the work efficiency of the heat treatment process personnel, shorten the preparation time, ensure the standardization and consistency of the process design, and facilitate the standardization of the heat treatment process, thereby improving the product quality and the economic benefits of the enterprise.
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