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1 Involute mathematical model Involute is the trajectory AK of any point K on the line when the line BK is purely rolling along the circumference.
According to the characteristics of the involute, we can get the mathematical formula of the involute x=rb(cos sin)y=rb(sin-cos) where x, yk point coordinates; rb base circle radius; rolling angle, =k k.
2 Involute gear parameter setting To use ProProgram to realize the parametric design of the gear, the gear must be three-dimensionally modeled in ProE. Because of the strong repeatability between the gears, the main parameters of the gears are the number of teeth, modulus and pressure angle. Therefore, as long as one gear is parameterized, other gears can be obtained by modifying the set parameters. The main parameters of the gear are set as shown.
After giving the above parameters, four reference circles are sketched using ProE, which are the base circle, the addendum circle, the index circle, and the root circle. After the creation is completed, the involute tooth profile is defined by using the form of a parametric equation.
(1) According to the involute equation, the following involute Cartesian reference gear base circle diameter db constitutes the Cartesian coordinate equation, which constitutes the Cartesian coordinate equation of the involute equation.
(2) Generating the involute contour line After creating the involute curve on the side of the tooth profile using the curve generated by the involute equation described above, create a tool using the image of the sketch drawing tool, the reference axis, the reference plane, and the like. Complete cogging curve. After creating the contour curve, use the stretch and the edge tool to create a tooth. After the successful success of the array, create the entities inside, and also use the relationship tool to control. The establishment of the graphical 3 layout and the realization of the parameter control after the successful creation are based on the PROE platform. The purpose of the model establishment is twofold: (1) to provide three-dimensional digital-analog samples for production, and to provide a detailed design for the structure. Good foundation; (2) Provide a reasonable and accurate model for detailed analysis, and also provide a basis for strength check for structural design.
The creation of the Layout file. The core function of Layout is to define the main parameters and main dimensions of the product, and set the relationship between these parameters and dimensions. Then, by declaring, the other design parts are associated with the Layout, so that the Layout controls the entire part.
The secondary function of Layout is to outline the shape and components of the part to achieve an intuitive understanding of the part. Since the geometric part of the Layout is non-parametric, the geometry, shape, etc. in the Layout have no meaning, only a visual effect, just like the grass in the manual design.
(1) Create a layout file (Prototype) in PROE, which is essentially a schematic diagram of the structure size, which is used to define the basic requirements and constraints of the component. It is not necessary to deal with a large number of specific or specific geometric features. A two-dimensional sketch created in layout mode that conceptually records and annotates parts or components. The main purpose of creating a layout file is to determine the fit, size, and other relationships between key design parameters, defining a set of global parameters for English components and their members. Then, the outline of the gear is drawn using CAXA software.
(2) Import it into ProE, and at the same time, the parameter declaration is required in the model file, and the declaration points to the previously created layout file. In this way, the size of the model is completely driven by the layout file. After the layout file is created, it is convenient to use this to drive the 3D model to implement parameter modeling. The essence of the layout file is a geometric parametric description of the drawing. The final result is a series of layout files with tree topological relations and corresponding model component files.
4 Conclusion The application of computer related technology and modern advanced design means provides convenience for the design of involute gears, and is also an inevitable trend of other product design and development. This paper starts from the ProE layout file and performs parameterized control on the gear 3D model. This method is especially suitable for product development with more structurally correct and variable product design requirements.
Of course, in practical applications, parametric design and human-computer interaction design should be combined and supplemented. The designer's thoughts and experience are to some extent not completely replaced by computers.
In view of the preset of the gear value of the pattern management
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