I. Overview <br> <br> leaves Lofting, is an important step in the wind turbine manufacturer, over the years, the plant has a traditional way of manual mapping to draw a model diagram. Among them, the unfolded scribing template of the ternary blade is the blanking template of the product blade and the inspection sample tooling, and the model design drawing requirement must be drawn in a ratio of 1:1, so that the drawing can be directly made into the standard in the tool manufacturing process.
In the past, when drawing a template, the designer first selected the boundary points on the drawing based on the expansion data of the blade, and then connected the points into a smooth curve, and then on the edge and exit sides of the blade according to the size of the product before welding. In addition to the machining allowance, the welding groove is removed, and the unfolding data of the blade is written on the drawing. The entire design drawing process is time consuming and prone to errors, including selection error (making the template boundary line not accurate enough) and data It is easy to write errors, misty errors and other errors.
With the development of computers, we have developed a CAD parametric design method, which is a professional parametric design system developed in AutoCAD R14 version, which is currently running entirely in AutoCAD. After entering the AutoCAD environment, the user can directly enter the design dialog box through the menu prompts. According to the Chinese prompt in the dialog box, enter the design data and press <OK> to complete the design. Therefore, design work can be done easily with a little computer savvy.
Second, the CAD design of the sample
The system consists of three parts: the program drawing module, the dialog module, and the control dialog module. The core part is the program drawing module.
The system automatically completes the entire manual drawing process on the computer through the programming process. The entire drawing process includes inputting and expanding the data time in only 20 minutes, which is fast, accurate, and can be used to verify the accuracy of the data through graphic verification. However, since the template is a curve and must be plotted in a ratio of 1:1, the programming process is also faced with many difficulties. Here are some key issues to illustrate.
1. Since the layout of the template must be plotted in a ratio of 1:1, there is a problem of the size of the frame during the drawing process. Therefore, in the drawing program of the ternary expansion template, the function of automatically selecting the frame according to the actual size of the template is set.
2. The blade boundary points of the ternary element generally have 20 to 26 points (x, y), that is, 40 to 52 data; every two points form a prime line, and the expansion template is composed of different prime lines. It may consist of 10 prime lines, or it may consist of 11, 12 or 13 prime lines, and the drawing program must be able to be used in a variety of situations, both in the case of 13 prime lines, without drawing data, but also Guaranteed to draw to the 10th point when 10 prime lines are terminated; but there is no direct conditional statement in the programming language to complete the selection of this condition. Therefore, this project combines the statements of several structures such as "if". solved this problem.
3. To cut the curve on the curve (Pline line) according to the actual length of the groove, and draw the groove at this position. If the graphic range is too large during programming, the curve is not selected. If the graphic range is too small, the cutoff point may be outside the screen window, but the curve cannot be selected. This project adopts the local operation method of window enlargement. After repeated trials, two suitable window points are determined, and this operation is finally completed by repeated switching of different windows.
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