Problems and Skills in Modeling Thread Parameterized Standard Parts Library (1) Parametric formula editing of detailed thread is based on the parameters of the thread profile to design the formula for the thread suitable for UG operation, so that the nominal of the thread The parameters such as diameter, small diameter, tooth angle and pitch are related, which solves the problem that the parameterized standard parts library of the thread can only make the simplified thread and can not make the detailed thread. This is an innovative point of this paper. In the formula expression editing settings, you should also note that you should first edit the formula and parameters related to the thread for other variables to call, to ensure that the logic sequence and function are correct, otherwise the parameterization process cannot be completed. (2) In the modeling of screw and thread, the screw screw part and the thread part are divided into two round tables, which is to avoid the problem that the system can be automatically modified to full thread and part of the thread cannot be solved when the parameterized standard parts library is generated. This may be a design issue for UGNX 3.0, and a threaded undercut can be added to the two round tables. (3) When modeling the bolt head, it is not usually drawn into a hexagonal shape by a hexagon, but is formed by drawing a sketch. After the generation, the formula can be edited, but the constraint and positioning of the sketch are very troublesome. The efficiency is low, and the under-constraining is easy to cause errors; there is also a shortcut method: cutting the cylinder into hexagonal prisms with six offset reference planes, which is relatively simple and clear, and can be parameterized for editing; of course, if you do not want to parameterize Modeling is just a single part modeling. It is still wise to use a hexagon to stretch into a hexagonal body, which is efficient and fast.

The method of calling the parameterized standard parts library of the detailed thread display. The simple part library method is based on the generated standard thread (still using the bolts built above as an example) template. Before the assembly of the specific parts, edit the formula expression one by one in the template file according to the standard parts (bolts) to be used. Save as a separate standard part to create a standard parts library, and then add existing components to the assembly parts according to the requirements of the part assembly. The idea of ​​using this method is very intuitive and clear, and the operation of the components is simple. Because the related call of the spreadsheet is avoided, the requirements on the system are not high, and it is not easy to make mistakes, but it is cumbersome and must be made before the assembly of the components. The required standard parts drawing is easy to cause trouble in prediction. It may be because the bolt size that is done or made less or not meets the assembly requirements, causing labor and time to be reworked, and the work efficiency is low.

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