Numerical design and development of three-dimensional standard parts library
Standard parts cover a wide range, but all have special names and mark codes. Designers need to select according to the conditions of use. The task that this paper needs to accomplish is to replace the designer's next reference to the standard to obtain the corresponding Mark the specific dimensions of the standard parts of the code, and finally generate the corresponding standard 3D graphics in the AutoCAD environment.
To complete this function, the first is to determine the type specifications of the standard parts required by the designer, then query the predefined A ccess standard parts library, obtain the relevant graphic parameters, and finally call the AutoCAD internal graphic generation function to obtain the standard part graphic. The basic flow chart is as follows: The overall design flow chart 2 calls the interface module (interface module). From the interface, the type of standard parts and the national standard number are obtained. The method adopted in this paper is to display the relevant options of the standard parts. The user makes a selection, of course, the information about the standard parts is stored in the database. The final interface is as shown in Figure and October 2006, Vol. 23, No. 5, Shenyang Institute of Aeronautics and Astronautics
The standard interface of the standard parts library selects the standard specification interface. Through the above two interfaces, you can communicate with the user. Of course, the options listed in the ListBox in the interface are displayed after querying the database.
Database module 3.1 Database design The design of the database is the key. First, it stores the standard size and key data of the standard parts. It should be similar to the standard parts of the mechanical standard, but it should be more suitable for program query.
For example, for the GB119-86 cylindrical pin table (for example), the difference is that the maximum and minimum lengths are divided into two, and the others are the same as the standard. The source of the nominal size from the table.
Secondly, there must be an entry form to manage other tables. The form taken in this paper lists the names of all other forms used and the corresponding national standard numbers.
In the database query program, a record of a table in the database is utilized, and the method adopted is the SQL statement for querying. The function of the module of the entity modeling module is to use the drawing function and the specific value obtained by the CAD. Generate 3D graphics.
For example, to produce a cylindrical pin, it can be divided into three parts: chamfered part, middle cylinder, and spherical crown part. Each part can be drawn by itself. The fifth phase of Wang Xia: Parametric design and development of 3D standard parts library, but pay attention to them. The geometric positional relationship between them.
All the programs described in this article have been debugged and can be used to generate 3D standard parts.
The research and development of the 3D standard parts library satisfies the requirements of rapid and accurate generation of standard parts in the design process, and saves time for accessing the database, improves the efficiency of the designer, reduces errors, and has certain practical value.
Silicon Wafer,Crystalline Silicon,Semiconductor Wafer,Silica Wafer
ZHONGWEI CITY YINYANG NEW ENERGY , http://www.yinyangnewenergy.com