Commonly used simple standard parts, such as screws, pins, etc., are composed of a graphic and a size parameter table.　　 (1) The variable size in the standard part, such as M, L, is established in the corresponding expression.　　 (2) Establish a UG three-dimensional solid model file, and the size in the model file is driven by the corresponding expression. (3) Open the 'Component Family' dialog box in the 'Tools' menu, add the required variable parameters (A, E, L, M), create a part family, then you can create an Excel spreadsheet of the component family parameters.

The time table only contains one row of the current parameter.　　 (4) Manually edit the parameter table, add common specifications and parameters to the Excel table to make a complete table, save and exit to complete the establishment of the part family. Through the above steps, the parent file of a component group is created. The screws of each structure only need this parent file. When using the polystyrene mold shell, select the corresponding line in the table according to the required specifications, and run the 'Create 'Parts', you can create a screw model file with a specified specification. This is a read-only sub-file of the part family and cannot be modified or edited to ensure the accuracy of standard parts.

The standard punch mainly includes 5 kinds of cutting edge cross-sectional shapes, of which the circular cutting edge cross-sectional shape is relatively simple, with only one diameter parameter. The other types of cutting edge cross-sectional shapes involve multiple parameters such as length (P), width (W), and fillet (R). Each parameter has a certain range of options, and the blanking gap injection machine should also be considered. Mold designers need to spend a lot of time to query data and check the shape parameters of the cutting edge when selecting standard punches.

Since the diameter of the punch is related to the thickness of the punched sheet, there will be a gap between the punch and the die. The gap value is usually 6-8 of the thickness of the material. The cross-sectional size of the punch's edge is often two decimal places. As a result, the standard punch specification code is very long, even reaching nearly a hundred characters. After the design is completed, the workload of filling in the parts list is huge, and the pattern conveyor belt is very error-prone.　　 The standard punch cutting edge section shape uses, logic, database functions, and has strong data filtering and calling functions. Making full use of these functions and making a component family table with judgment and search functions will make the selection of standard punches a very easy task.

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