Using ObjectARX to develop standard parts in AutoCAD In order to make the operation interface friendly and easy to use, the input of data is in the form of a dialog box. In the specific design, first select the standard part type, and then pop up the standard part series selection dialog box. After confirming the series, the series parameter input dialog box pops up, select the nominal size, and perform the national standard index, that is, perform the binary search to obtain the required data. Draw the required graphics after confirmation. The flow chart is shown in Figure 2: Figure 2 standard part CAD flow chart 3 common parts CAD. Structures with fixed components Some common components have a fixed structural form. That is, within a certain range of parameters, the form is unchanged and the size changes, such as the commonly used ten types of forged and cast cylindrical gear structures. For these components, the goal of developing a CAD application with ObjectARX is to input the parameters, the system should be able to determine the recommended structure, and allow the user to change; after selecting the assembly drawing or part drawing and confirming, draw as needed Corresponding graphics. Therefore, when designing this type of component, the overall design method is generally used. That is, after the basic parameter input dialog box, the system can perform logical reasoning and determine the recommended structural form, and display all the types of structures that can be used. Once the structure is confirmed, other parameter input dialogs (including the selection of the assembly drawing and part drawing, the selection of the main view and the remaining views, and the selection of the accuracy level) are popped up, and then previewed or plotted. Therefore, the main workload is the design of the dialog box and the processing of the drawing skills, and the principle is relatively simple, so there is not much discussion here.
Components with complex and variable structural forms The goal of developing such parts CAD applications with ObjectARX is to operate as quickly and easily as possible, and to generate parts assembly drawings and parts drawings that meet the user's structural requirements as much as possible. The overall design method is generally not applicable to the design of such parts, because it is impossible to know the structural form of such parts in advance in the program, and it is impossible to design the part as a whole. The commonly used method is the primitive method, which first analyzes and summarizes such parts. When designing such parts with the primitive method, the summation of the primitives is the key, and the connection between the primitives is difficult. That is to say, if the primitives are well summarized, it is convenient to construct the graphics of the parts; if the primitives are well connected, it is guaranteed to be correct when constructing the graphics of the parts. For axial parts (such as shafts), the axial connection is better; for disc parts (such as single cylindrical gears), the radial connection is better; for composite parts (such as multiple cylindrical gears), A combination of axial and radial engagement should generally be used. Of course, parts constructed with the primitive method generally need to be modified more or less afterwards, but the high quality of the design elements can greatly reduce the amount of work after the event. At the same time, it should be noted that when drawing standards are used in the primitives, these standard data should be managed and queried using the database description method as described in the standard CAD.
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