Research And Development Of Checking-fixture Design System For Automotive Pipe

The bended pipe is widely used in automobile,aviation and other fields.The quality of pipes decide the quality of entire product design.Because of the simple structure and the convenient operation, checking-fixture for bended pipe which tests bended pipe rapidly and measuring its error is widly used in the process of production processing. The design of checking-fixture must be in accordance with the special shape of the products and components. Therefore the design process of checking-fixture is complicated, strict and making high accuracy requirements. Presently, there is no special checking-fixture design software (or module), the design mainly depends on artificially drawing in CAD software.The design process requires a large number of parameters calculation and interactive assembly which takes much time and has low efficiency and poor standardization.Based on this,companies urgently need a intelligent checking-fixture design module to replace the manual design patterns.Interactive assembly of checking-fixture's parts is the core of designing system.In order to avoid duplication of models and reusing model,template technology based on parametric is propose.Template technology is used to establish template library of checking-fixture and produce checking-fixture's parts using parameter-driven method.According to the status of automotive pipe checking-fixture design, Automatic identification assembly relitionship technology based on parametric design is proposed. Parametric model is employed to establish the correlation between components, which are restrained by the assembly relationship. And the components automatically identify constraint relations in the assembly process to make the product assemble intelligently and automatically.Based on above research,the intellectualized design system for checking-fixture is developed based on the above design method on the platform UG NX5.0. It has been applied to practical production. The results shows that the system greatly improve design efficiency, shorten design time, improve design quality and enhance standardization level of the checking-fixture design.