Three-dimensional modeling method based on parameter, using Solidworks to establish 3D parametric valve standard parts library. By its size and dimension driven function equations, to realize parametric modeling. After the completion of call in Solidworks MS Excel, generating parts design table, each parameter element value is added to the design table, the three-dimensional standard corresponds to the generation of Solidworks parts library. The base are easy to modify and add, delete.
Method of establishing 3D Standard Part Library
Usually establishes 3D standard parts library, there are two main ways:
(1) method to establish the gallery. Library law is not parameterized form, when the standard changes, could not by changing the parameters of the 3D standard parts corresponding changes. Therefore, the standard parts library is large and difficult to maintain.
(2) using three-dimensional modeling method based on parametric feature. In this way all the standard parts library of standard parts by features and parameters control of its own, small occupied space, easy to modify and maintain [1].
To establish the key parameters of standard parts library is: the establishment of the three-dimensional parametric model; establish the standard part database of characteristic parameters of the.
In the parametric model of dimension driving, when determining a series of size, the system automatically into a series of a group of parameters from the database, and the value of these parameters directly assigned to the size variables, to size driven by dimension drive parameters, resulting in different specifications of the standard parts.
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Example of using Solidworks to establish 3D parametric valve standard parts library
Solidworks is a powerful parametric design function of CAD software. In the valve design, the pneumatic control valve characteristics, parametric design is applied to some common parts, formed a series of parts library. As long as the input parameters, it can automatically generate the corresponding original map based on the same structure, different sizes of new parts. The sliding seat ball valve as an example to specify the method to establish the valve components parametric design and standard parts library.
According to the "figure and size of valve design manual" is given by (Fig. 1, table 1), the parametric design of the sliding seat ball valve. The sliding seat ball valve according to the different diameters are mainly include the following series: 15, 19, 23, 38, 49, 62, 75, 102 and 122, then, the runner diameter D for a group of parameters of 15 three-dimensional parametric modeling.
Parametric modeling based on the dimension driving
According to figure 1 and table 1, parametric modeling of sphere, on the geometry model to determine its unique shape by size constraints and structural constraints of [2], the specific steps are as follows:
(1) drawn ball. According to the size of the S draw the ball in vitro profile, using base 2 body stretch, generating spheroids.
(2) resection holes D. In the sketch drawing D diameter circle, creating a hole D. Copyright dedecms
(3) L1 and 85 ° resection to determine.
The size constraint: Figure 2 sketches of the equation H1=S/2+10 by size φ S to drive H1, in particular to select "add" command, the dimension name by double-clicking the graph size required to add automatic input formula dialog box, edit the formula, click "OK", as shown in figure 3. The equation: D3@ sketch 4=H1. Sketch the rest dimensions determined according to L1 and 85 °.
Structural constraints: because the sketches for the symmetrical, choice has been drawn half sketches and center line of good, choose symmetric command, complete symmetry sketch. Select the "removal" and "stretch" command, and because the sketch datum in the center of the sphere, so the use of two-way resection; and because is the removal of sketch entities outside, the results as shown in figure 4.
Complete resection of dome, notch of the subsequent steps, the final three-dimensional model as shown in Figure 5; elements of each parameter as shown in Figure 6; all the equations using the 3D modeling process is shown in Figure 7
This establishes a sliding seat ball valve parametric model based on the dimension driving.
Making the serial parts design table to establish the standard part library
(1) select the annotation
Complete parametric modeling, on the sliding seat ball valve size FeatureManger (design tree), select the "note" option, click the right mouse button, on the shortcut menu, select "open display Annotation" command and "display feature size" command, the system will display the parameter size.
Select the serial parts design table
After completing the steps above, click on the model size, main menu "insert" command, select the "serial parts design table in the drop-down list". Solidworks will call the MS Excel, and generates a table, as shown in Figure 8, note: the menu and toolbar has become Excel form. Double-click on the size, the size of the full name is automatically added to the design surface, at the same time dimension value corresponding to automatically fill in, use the same method to other characteristic parameters of size name all added to the design table, as shown in figure 9. The rest of the diameter size range of parameter values as long as the direct input to the series spare parts design table.
Generating series parts library
Input the corresponding parameters, click the Solidworks graphic in the blank area, can go back to the Solidworks environment. Then you configure icon on the lower left, into the configuration management. Solidworks has been designed according to the table generation series parts library. Double-click the configuration of 19 parts, as shown in Figure 10; double configuration 38, graphics change, as shown in figure 11.
Conclusion
The above steps, click the model size, select entrees above steps to establish the feature parameter database of the sliding seat ball valve, in this database, the ball runner diameter size D as data retrieval. By selecting the sphere of runner diameter D, can retrieve a set of corresponding parameters in Excel, the feature parameters are passed to the Solidworks application, so as to drive the program automatic generation of standard parts. If you want to modify the parameters or add size series of new, as long as the series parts table directly modify or add the parameters can be. The method is applied to establish various valves and other hydraulic components of the standard parts library, simple, fast, good effect.
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