Explain the research and application of fastener tools
The role of fasteners is to fasten the connection of mechanical parts, its extremely wide range of applications, it is characterized by a variety of specifications, performance and use different, and product standardization, a high degree of serialization. At present, most enterprises have created a standard parts library (including fasteners), but still use manual assembly when assembling.
This traditional assembly method has the following disadvantages: Fasteners are stored locally or at designated locations on the server and are selected by the user as needed. For the complex parts of the standard parts library levels need to find step by step, the selection difficult; fasteners are not assembled in groups, you need to assemble one by one, and every two components to achieve a complete assembly, at least the need to define two Constraints, cumbersome operation, inefficiencies; for the fasteners have been modified specifications or delete, you need to operate one by one, inefficient and does not meet the design habits; Fastener openings generally first punch and then re-assembly fasteners , Fastener specifications and screw size is not related to the design changes can not be updated simultaneously; Fastener combination, with the need to query the relevant standards or mechanical design manuals, inconvenient business common fastener knowledge accumulation and transmission.
In addition, in order to enhance the automation of attribute parameter selection in the assembly process, this paper also studies the automatic matching of parameters of bolts, nuts, washers, etc. When the user selects the nominal diameter of a certain bolt, With the different ways, the system automatically reads out the standard parts library information table to read out the bolt, washer and other parameters matching the selected bolt nominal diameter, in order to achieve the rapid selection and update of the supporting fastener group.
The realization of a group assembly is one of the key technologies for fastener tools. The core idea is to define the mating fasteners as a group in the assembly model.
Generally according to the type of the main drive different, the fastener group can be divided into bolts, screws, nuts three categories, and according to the different main drive, you can define a variety of different combinations. For example, some combinations require a spring pad and a flat pad to be installed on one end, and some have a spring pad and a flat pad in both directions, some have a thin nut at the end of the combination, and the like. The combination can also be edited as needed, after editing can be added to the list, easy to repeat.
To facilitate the designer's viewing, the graphical preview mode, which renders selected fasteners (unselected fasteners in reverse video), visually shows the effect of the assembly, as shown.
In addition, in order to improve the efficiency of the assembly, the software also studied the batch assembly, fast U-turn and batch delete functions.
1) Batch assembly function: In an assembly, for the same size, the same way with the fastener group, often need to assemble multiple times. The program automatically places the fastener sets in bulk by finding the same hole features.
Combination method 10 Bolt 0 Upper flat pad 1 Upper spring pad 0 Lower spring pad 0 Lower flat pad 0 Nut 0 "Thin nut Add to list Fastener combination Mechanical industry standardization and quality Step 6S W" inch 2> Fast U-turn function: Rotate the selected set of fasteners as a whole 180 ° and swap the (mating face) on both ends of the set of fasteners (bolt side and nut side) to change the orientation of the fastener set.